drivers/media/v4l2-core/v4l2-ctrls.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     V4L2 controls framework implementation.
   4
   5     Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
   6
   7  */
   8
   9 #include <linux/ctype.h>
  10 #include <linux/mm.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <media/v4l2-ioctl.h>
  14 #include <media/v4l2-device.h>
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/v4l2-event.h>
  17 #include <media/v4l2-dev.h>
  18
  19 #define has_op(master, op) \
  20         (master->ops && master->ops->op)
  21 #define call_op(master, op) \
  22         (has_op(master, op) ? master->ops->op(master) : 0)
  23
  24 /* Internal temporary helper struct, one for each v4l2_ext_control */
  25 struct v4l2_ctrl_helper {
  26         /* Pointer to the control reference of the master control */
  27         struct v4l2_ctrl_ref *mref;
  28         /* The control ref corresponding to the v4l2_ext_control ID field. */
  29         struct v4l2_ctrl_ref *ref;
  30         /* v4l2_ext_control index of the next control belonging to the
  31            same cluster, or 0 if there isn't any. */
  32         u32 next;
  33 };
  34
  35 /* Small helper function to determine if the autocluster is set to manual
  36    mode. */
  37 static bool is_cur_manual(const struct v4l2_ctrl *master)
  38 {
  39         return master->is_auto && master->cur.val == master->manual_mode_value;
  40 }
  41
  42 /* Same as above, but this checks the against the new value instead of the
  43    current value. */
  44 static bool is_new_manual(const struct v4l2_ctrl *master)
  45 {
  46         return master->is_auto && master->val == master->manual_mode_value;
  47 }
  48
  49 /* Returns NULL or a character pointer array containing the menu for
  50    the given control ID. The pointer array ends with a NULL pointer.
  51    An empty string signifies a menu entry that is invalid. This allows
  52    drivers to disable certain options if it is not supported. */
  53 const char * const *v4l2_ctrl_get_menu(u32 id)
  54 {
  55         static const char * const mpeg_audio_sampling_freq[] = {
  56                 "44.1 kHz",
  57                 "48 kHz",
  58                 "32 kHz",
  59                 NULL
  60         };
  61         static const char * const mpeg_audio_encoding[] = {
  62                 "MPEG-1/2 Layer I",
  63                 "MPEG-1/2 Layer II",
  64                 "MPEG-1/2 Layer III",
  65                 "MPEG-2/4 AAC",
  66                 "AC-3",
  67                 NULL
  68         };
  69         static const char * const mpeg_audio_l1_bitrate[] = {
  70                 "32 kbps",
  71                 "64 kbps",
  72                 "96 kbps",
  73                 "128 kbps",
  74                 "160 kbps",
  75                 "192 kbps",
  76                 "224 kbps",
  77                 "256 kbps",
  78                 "288 kbps",
  79                 "320 kbps",
  80                 "352 kbps",
  81                 "384 kbps",
  82                 "416 kbps",
  83                 "448 kbps",
  84                 NULL
  85         };
  86         static const char * const mpeg_audio_l2_bitrate[] = {
  87                 "32 kbps",
  88                 "48 kbps",
  89                 "56 kbps",
  90                 "64 kbps",
  91                 "80 kbps",
  92                 "96 kbps",
  93                 "112 kbps",
  94                 "128 kbps",
  95                 "160 kbps",
  96                 "192 kbps",
  97                 "224 kbps",
  98                 "256 kbps",
  99                 "320 kbps",
 100                 "384 kbps",
 101                 NULL
 102         };
 103         static const char * const mpeg_audio_l3_bitrate[] = {
 104                 "32 kbps",
 105                 "40 kbps",
 106                 "48 kbps",
 107                 "56 kbps",
 108                 "64 kbps",
 109                 "80 kbps",
 110                 "96 kbps",
 111                 "112 kbps",
 112                 "128 kbps",
 113                 "160 kbps",
 114                 "192 kbps",
 115                 "224 kbps",
 116                 "256 kbps",
 117                 "320 kbps",
 118                 NULL
 119         };
 120         static const char * const mpeg_audio_ac3_bitrate[] = {
 121                 "32 kbps",
 122                 "40 kbps",
 123                 "48 kbps",
 124                 "56 kbps",
 125                 "64 kbps",
 126                 "80 kbps",
 127                 "96 kbps",
 128                 "112 kbps",
 129                 "128 kbps",
 130                 "160 kbps",
 131                 "192 kbps",
 132                 "224 kbps",
 133                 "256 kbps",
 134                 "320 kbps",
 135                 "384 kbps",
 136                 "448 kbps",
 137                 "512 kbps",
 138                 "576 kbps",
 139                 "640 kbps",
 140                 NULL
 141         };
 142         static const char * const mpeg_audio_mode[] = {
 143                 "Stereo",
 144                 "Joint Stereo",
 145                 "Dual",
 146                 "Mono",
 147                 NULL
 148         };
 149         static const char * const mpeg_audio_mode_extension[] = {
 150                 "Bound 4",
 151                 "Bound 8",
 152                 "Bound 12",
 153                 "Bound 16",
 154                 NULL
 155         };
 156         static const char * const mpeg_audio_emphasis[] = {
 157                 "No Emphasis",
 158                 "50/15 us",
 159                 "CCITT J17",
 160                 NULL
 161         };
 162         static const char * const mpeg_audio_crc[] = {
 163                 "No CRC",
 164                 "16-bit CRC",
 165                 NULL
 166         };
 167         static const char * const mpeg_audio_dec_playback[] = {
 168                 "Auto",
 169                 "Stereo",
 170                 "Left",
 171                 "Right",
 172                 "Mono",
 173                 "Swapped Stereo",
 174                 NULL
 175         };
 176         static const char * const mpeg_video_encoding[] = {
 177                 "MPEG-1",
 178                 "MPEG-2",
 179                 "MPEG-4 AVC",
 180                 NULL
 181         };
 182         static const char * const mpeg_video_aspect[] = {
 183                 "1x1",
 184                 "4x3",
 185                 "16x9",
 186                 "2.21x1",
 187                 NULL
 188         };
 189         static const char * const mpeg_video_bitrate_mode[] = {
 190                 "Variable Bitrate",
 191                 "Constant Bitrate",
 192                 NULL
 193         };
 194         static const char * const mpeg_stream_type[] = {
 195                 "MPEG-2 Program Stream",
 196                 "MPEG-2 Transport Stream",
 197                 "MPEG-1 System Stream",
 198                 "MPEG-2 DVD-compatible Stream",
 199                 "MPEG-1 VCD-compatible Stream",
 200                 "MPEG-2 SVCD-compatible Stream",
 201                 NULL
 202         };
 203         static const char * const mpeg_stream_vbi_fmt[] = {
 204                 "No VBI",
 205                 "Private Packet, IVTV Format",
 206                 NULL
 207         };
 208         static const char * const camera_power_line_frequency[] = {
 209                 "Disabled",
 210                 "50 Hz",
 211                 "60 Hz",
 212                 "Auto",
 213                 NULL
 214         };
 215         static const char * const camera_exposure_auto[] = {
 216                 "Auto Mode",
 217                 "Manual Mode",
 218                 "Shutter Priority Mode",
 219                 "Aperture Priority Mode",
 220                 NULL
 221         };
 222         static const char * const camera_exposure_metering[] = {
 223                 "Average",
 224                 "Center Weighted",
 225                 "Spot",
 226                 "Matrix",
 227                 NULL
 228         };
 229         static const char * const camera_auto_focus_range[] = {
 230                 "Auto",
 231                 "Normal",
 232                 "Macro",
 233                 "Infinity",
 234                 NULL
 235         };
 236         static const char * const colorfx[] = {
 237                 "None",
 238                 "Black & White",
 239                 "Sepia",
 240                 "Negative",
 241                 "Emboss",
 242                 "Sketch",
 243                 "Sky Blue",
 244                 "Grass Green",
 245                 "Skin Whiten",
 246                 "Vivid",
 247                 "Aqua",
 248                 "Art Freeze",
 249                 "Silhouette",
 250                 "Solarization",
 251                 "Antique",
 252                 "Set Cb/Cr",
 253                 NULL
 254         };
 255         static const char * const auto_n_preset_white_balance[] = {
 256                 "Manual",
 257                 "Auto",
 258                 "Incandescent",
 259                 "Fluorescent",
 260                 "Fluorescent H",
 261                 "Horizon",
 262                 "Daylight",
 263                 "Flash",
 264                 "Cloudy",
 265                 "Shade",
 266                 NULL,
 267         };
 268         static const char * const camera_iso_sensitivity_auto[] = {
 269                 "Manual",
 270                 "Auto",
 271                 NULL
 272         };
 273         static const char * const scene_mode[] = {
 274                 "None",
 275                 "Backlight",
 276                 "Beach/Snow",
 277                 "Candle Light",
 278                 "Dusk/Dawn",
 279                 "Fall Colors",
 280                 "Fireworks",
 281                 "Landscape",
 282                 "Night",
 283                 "Party/Indoor",
 284                 "Portrait",
 285                 "Sports",
 286                 "Sunset",
 287                 "Text",
 288                 NULL
 289         };
 290         static const char * const tune_emphasis[] = {
 291                 "None",
 292                 "50 Microseconds",
 293                 "75 Microseconds",
 294                 NULL,
 295         };
 296         static const char * const header_mode[] = {
 297                 "Separate Buffer",
 298                 "Joined With 1st Frame",
 299                 NULL,
 300         };
 301         static const char * const multi_slice[] = {
 302                 "Single",
 303                 "Max Macroblocks",
 304                 "Max Bytes",
 305                 NULL,
 306         };
 307         static const char * const entropy_mode[] = {
 308                 "CAVLC",
 309                 "CABAC",
 310                 NULL,
 311         };
 312         static const char * const mpeg_h264_level[] = {
 313                 "1",
 314                 "1b",
 315                 "1.1",
 316                 "1.2",
 317                 "1.3",
 318                 "2",
 319                 "2.1",
 320                 "2.2",
 321                 "3",
 322                 "3.1",
 323                 "3.2",
 324                 "4",
 325                 "4.1",
 326                 "4.2",
 327                 "5",
 328                 "5.1",
 329                 NULL,
 330         };
 331         static const char * const h264_loop_filter[] = {
 332                 "Enabled",
 333                 "Disabled",
 334                 "Disabled at Slice Boundary",
 335                 NULL,
 336         };
 337         static const char * const h264_profile[] = {
 338                 "Baseline",
 339                 "Constrained Baseline",
 340                 "Main",
 341                 "Extended",
 342                 "High",
 343                 "High 10",
 344                 "High 422",
 345                 "High 444 Predictive",
 346                 "High 10 Intra",
 347                 "High 422 Intra",
 348                 "High 444 Intra",
 349                 "CAVLC 444 Intra",
 350                 "Scalable Baseline",
 351                 "Scalable High",
 352                 "Scalable High Intra",
 353                 "Stereo High",
 354                 "Multiview High",
 355                 NULL,
 356         };
 357         static const char * const vui_sar_idc[] = {
 358                 "Unspecified",
 359                 "1:1",
 360                 "12:11",
 361                 "10:11",
 362                 "16:11",
 363                 "40:33",
 364                 "24:11",
 365                 "20:11",
 366                 "32:11",
 367                 "80:33",
 368                 "18:11",
 369                 "15:11",
 370                 "64:33",
 371                 "160:99",
 372                 "4:3",
 373                 "3:2",
 374                 "2:1",
 375                 "Extended SAR",
 376                 NULL,
 377         };
 378         static const char * const h264_fp_arrangement_type[] = {
 379                 "Checkerboard",
 380                 "Column",
 381                 "Row",
 382                 "Side by Side",
 383                 "Top Bottom",
 384                 "Temporal",
 385                 NULL,
 386         };
 387         static const char * const h264_fmo_map_type[] = {
 388                 "Interleaved Slices",
 389                 "Scattered Slices",
 390                 "Foreground with Leftover",
 391                 "Box Out",
 392                 "Raster Scan",
 393                 "Wipe Scan",
 394                 "Explicit",
 395                 NULL,
 396         };
 397         static const char * const mpeg_mpeg2_level[] = {
 398                 "Low",
 399                 "Main",
 400                 "High 1440",
 401                 "High",
 402                 NULL,
 403         };
 404         static const char * const mpeg2_profile[] = {
 405                 "Simple",
 406                 "Main",
 407                 "SNR Scalable",
 408                 "Spatially Scalable",
 409                 "High",
 410                 NULL,
 411         };
 412         static const char * const mpeg_mpeg4_level[] = {
 413                 "0",
 414                 "0b",
 415                 "1",
 416                 "2",
 417                 "3",
 418                 "3b",
 419                 "4",
 420                 "5",
 421                 NULL,
 422         };
 423         static const char * const mpeg4_profile[] = {
 424                 "Simple",
 425                 "Advanced Simple",
 426                 "Core",
 427                 "Simple Scalable",
 428                 "Advanced Coding Efficiency",
 429                 NULL,
 430         };
 431
 432         static const char * const vpx_golden_frame_sel[] = {
 433                 "Use Previous Frame",
 434                 "Use Previous Specific Frame",
 435                 NULL,
 436         };
 437         static const char * const vp8_profile[] = {
 438                 "0",
 439                 "1",
 440                 "2",
 441                 "3",
 442                 NULL,
 443         };
 444         static const char * const vp9_profile[] = {
 445                 "0",
 446                 "1",
 447                 "2",
 448                 "3",
 449                 NULL,
 450         };
 451
 452         static const char * const flash_led_mode[] = {
 453                 "Off",
 454                 "Flash",
 455                 "Torch",
 456                 NULL,
 457         };
 458         static const char * const flash_strobe_source[] = {
 459                 "Software",
 460                 "External",
 461                 NULL,
 462         };
 463
 464         static const char * const jpeg_chroma_subsampling[] = {
 465                 "4:4:4",
 466                 "4:2:2",
 467                 "4:2:0",
 468                 "4:1:1",
 469                 "4:1:0",
 470                 "Gray",
 471                 NULL,
 472         };
 473         static const char * const dv_tx_mode[] = {
 474                 "DVI-D",
 475                 "HDMI",
 476                 NULL,
 477         };
 478         static const char * const dv_rgb_range[] = {
 479                 "Automatic",
 480                 "RGB Limited Range (16-235)",
 481                 "RGB Full Range (0-255)",
 482                 NULL,
 483         };
 484         static const char * const dv_it_content_type[] = {
 485                 "Graphics",
 486                 "Photo",
 487                 "Cinema",
 488                 "Game",
 489                 "No IT Content",
 490                 NULL,
 491         };
 492         static const char * const detect_md_mode[] = {
 493                 "Disabled",
 494                 "Global",
 495                 "Threshold Grid",
 496                 "Region Grid",
 497                 NULL,
 498         };
 499
 500         static const char * const hevc_profile[] = {
 501                 "Main",
 502                 "Main Still Picture",
 503                 "Main 10",
 504                 NULL,
 505         };
 506         static const char * const hevc_level[] = {
 507                 "1",
 508                 "2",
 509                 "2.1",
 510                 "3",
 511                 "3.1",
 512                 "4",
 513                 "4.1",
 514                 "5",
 515                 "5.1",
 516                 "5.2",
 517                 "6",
 518                 "6.1",
 519                 "6.2",
 520                 NULL,
 521         };
 522         static const char * const hevc_hierarchial_coding_type[] = {
 523                 "B",
 524                 "P",
 525                 NULL,
 526         };
 527         static const char * const hevc_refresh_type[] = {
 528                 "None",
 529                 "CRA",
 530                 "IDR",
 531                 NULL,
 532         };
 533         static const char * const hevc_size_of_length_field[] = {
 534                 "0",
 535                 "1",
 536                 "2",
 537                 "4",
 538                 NULL,
 539         };
 540         static const char * const hevc_tier[] = {
 541                 "Main",
 542                 "High",
 543                 NULL,
 544         };
 545         static const char * const hevc_loop_filter_mode[] = {
 546                 "Disabled",
 547                 "Enabled",
 548                 "Disabled at slice boundary",
 549                 "NULL",
 550         };
 551
 552         switch (id) {
 553         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 554                 return mpeg_audio_sampling_freq;
 555         case V4L2_CID_MPEG_AUDIO_ENCODING:
 556                 return mpeg_audio_encoding;
 557         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 558                 return mpeg_audio_l1_bitrate;
 559         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 560                 return mpeg_audio_l2_bitrate;
 561         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 562                 return mpeg_audio_l3_bitrate;
 563         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 564                 return mpeg_audio_ac3_bitrate;
 565         case V4L2_CID_MPEG_AUDIO_MODE:
 566                 return mpeg_audio_mode;
 567         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 568                 return mpeg_audio_mode_extension;
 569         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 570                 return mpeg_audio_emphasis;
 571         case V4L2_CID_MPEG_AUDIO_CRC:
 572                 return mpeg_audio_crc;
 573         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
 574         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
 575                 return mpeg_audio_dec_playback;
 576         case V4L2_CID_MPEG_VIDEO_ENCODING:
 577                 return mpeg_video_encoding;
 578         case V4L2_CID_MPEG_VIDEO_ASPECT:
 579                 return mpeg_video_aspect;
 580         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 581                 return mpeg_video_bitrate_mode;
 582         case V4L2_CID_MPEG_STREAM_TYPE:
 583                 return mpeg_stream_type;
 584         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 585                 return mpeg_stream_vbi_fmt;
 586         case V4L2_CID_POWER_LINE_FREQUENCY:
 587                 return camera_power_line_frequency;
 588         case V4L2_CID_EXPOSURE_AUTO:
 589                 return camera_exposure_auto;
 590         case V4L2_CID_EXPOSURE_METERING:
 591                 return camera_exposure_metering;
 592         case V4L2_CID_AUTO_FOCUS_RANGE:
 593                 return camera_auto_focus_range;
 594         case V4L2_CID_COLORFX:
 595                 return colorfx;
 596         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
 597                 return auto_n_preset_white_balance;
 598         case V4L2_CID_ISO_SENSITIVITY_AUTO:
 599                 return camera_iso_sensitivity_auto;
 600         case V4L2_CID_SCENE_MODE:
 601                 return scene_mode;
 602         case V4L2_CID_TUNE_PREEMPHASIS:
 603                 return tune_emphasis;
 604         case V4L2_CID_TUNE_DEEMPHASIS:
 605                 return tune_emphasis;
 606         case V4L2_CID_FLASH_LED_MODE:
 607                 return flash_led_mode;
 608         case V4L2_CID_FLASH_STROBE_SOURCE:
 609                 return flash_strobe_source;
 610         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 611                 return header_mode;
 612         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 613                 return multi_slice;
 614         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 615                 return entropy_mode;
 616         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 617                 return mpeg_h264_level;
 618         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 619                 return h264_loop_filter;
 620         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 621                 return h264_profile;
 622         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 623                 return vui_sar_idc;
 624         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
 625                 return h264_fp_arrangement_type;
 626         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
 627                 return h264_fmo_map_type;
 628         case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
 629                 return mpeg_mpeg2_level;
 630         case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
 631                 return mpeg2_profile;
 632         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 633                 return mpeg_mpeg4_level;
 634         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 635                 return mpeg4_profile;
 636         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
 637                 return vpx_golden_frame_sel;
 638         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
 639                 return vp8_profile;
 640         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
 641                 return vp9_profile;
 642         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 643                 return jpeg_chroma_subsampling;
 644         case V4L2_CID_DV_TX_MODE:
 645                 return dv_tx_mode;
 646         case V4L2_CID_DV_TX_RGB_RANGE:
 647         case V4L2_CID_DV_RX_RGB_RANGE:
 648                 return dv_rgb_range;
 649         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
 650         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
 651                 return dv_it_content_type;
 652         case V4L2_CID_DETECT_MD_MODE:
 653                 return detect_md_mode;
 654         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
 655                 return hevc_profile;
 656         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
 657                 return hevc_level;
 658         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
 659                 return hevc_hierarchial_coding_type;
 660         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
 661                 return hevc_refresh_type;
 662         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
 663                 return hevc_size_of_length_field;
 664         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
 665                 return hevc_tier;
 666         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
 667                 return hevc_loop_filter_mode;
 668
 669         default:
 670                 return NULL;
 671         }
 672 }
 673 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 674
 675 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
 676 /*
 677  * Returns NULL or an s64 type array containing the menu for given
 678  * control ID. The total number of the menu items is returned in @len.
 679  */
 680 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
 681 {
 682         static const s64 qmenu_int_vpx_num_partitions[] = {
 683                 1, 2, 4, 8,
 684         };
 685
 686         static const s64 qmenu_int_vpx_num_ref_frames[] = {
 687                 1, 2, 3,
 688         };
 689
 690         switch (id) {
 691         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
 692                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
 693         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
 694                 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
 695         default:
 696                 *len = 0;
 697                 return NULL;
 698         }
 699 }
 700 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
 701
 702 /* Return the control name. */
 703 const char *v4l2_ctrl_get_name(u32 id)
 704 {
 705         switch (id) {
 706         /* USER controls */
 707         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 708         case V4L2_CID_USER_CLASS:               return "User Controls";
 709         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 710         case V4L2_CID_CONTRAST:                 return "Contrast";
 711         case V4L2_CID_SATURATION:               return "Saturation";
 712         case V4L2_CID_HUE:                      return "Hue";
 713         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 714         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 715         case V4L2_CID_AUDIO_BASS:               return "Bass";
 716         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 717         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 718         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 719         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 720         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 721         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 722         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 723         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 724         case V4L2_CID_GAMMA:                    return "Gamma";
 725         case V4L2_CID_EXPOSURE:                 return "Exposure";
 726         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 727         case V4L2_CID_GAIN:                     return "Gain";
 728         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 729         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 730         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 731         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 732         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 733         case V4L2_CID_SHARPNESS:                return "Sharpness";
 734         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 735         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 736         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 737         case V4L2_CID_COLORFX:                  return "Color Effects";
 738         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 739         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 740         case V4L2_CID_ROTATE:                   return "Rotate";
 741         case V4L2_CID_BG_COLOR:                 return "Background Color";
 742         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 743         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 744         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 745         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:  return "Min Number of Capture Buffers";
 746         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:   return "Min Number of Output Buffers";
 747         case V4L2_CID_ALPHA_COMPONENT:          return "Alpha Component";
 748         case V4L2_CID_COLORFX_CBCR:             return "Color Effects, CbCr";
 749
 750         /* Codec controls */
 751         /* The MPEG controls are applicable to all codec controls
 752          * and the 'MPEG' part of the define is historical */
 753         /* Keep the order of the 'case's the same as in videodev2.h! */
 754         case V4L2_CID_MPEG_CLASS:               return "Codec Controls";
 755         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 756         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 757         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 758         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 759         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 760         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 761         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 762         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 763         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 764         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 765         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 766         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 767         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 768         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 769         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 770         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 771         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 772         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 773         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 774         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 775         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:  return "Audio Playback";
 776         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
 777         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 778         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 779         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 780         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 781         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 782         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 783         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 784         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 785         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 786         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 787         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 788         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 789         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:       return "Decoder Slice Interface";
 790         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:  return "MPEG4 Loop Filter Enable";
 791         case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:       return "Number of Intra Refresh MBs";
 792         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:               return "Frame Level Rate Control Enable";
 793         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:                  return "H264 MB Level Rate Control";
 794         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:                   return "Sequence Header Mode";
 795         case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:                   return "Max Number of Reference Pics";
 796         case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:               return "H263 I-Frame QP Value";
 797         case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:               return "H263 P-Frame QP Value";
 798         case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:               return "H263 B-Frame QP Value";
 799         case V4L2_CID_MPEG_VIDEO_H263_MIN_QP:                   return "H263 Minimum QP Value";
 800         case V4L2_CID_MPEG_VIDEO_H263_MAX_QP:                   return "H263 Maximum QP Value";
 801         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:               return "H264 I-Frame QP Value";
 802         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:               return "H264 P-Frame QP Value";
 803         case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP:               return "H264 B-Frame QP Value";
 804         case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:                   return "H264 Maximum QP Value";
 805         case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:                   return "H264 Minimum QP Value";
 806         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:            return "H264 8x8 Transform Enable";
 807         case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE:                 return "H264 CPB Buffer Size";
 808         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:             return "H264 Entropy Mode";
 809         case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD:                 return "H264 I-Frame Period";
 810         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:                    return "H264 Level";
 811         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA:        return "H264 Loop Filter Alpha Offset";
 812         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA:         return "H264 Loop Filter Beta Offset";
 813         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:         return "H264 Loop Filter Mode";
 814         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:                  return "H264 Profile";
 815         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT:       return "Vertical Size of SAR";
 816         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH:        return "Horizontal Size of SAR";
 817         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:           return "Aspect Ratio VUI Enable";
 818         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:              return "VUI Aspect Ratio IDC";
 819         case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING:        return "H264 Enable Frame Packing SEI";
 820         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0:   return "H264 Set Curr. Frame as Frame0";
 821         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:  return "H264 FP Arrangement Type";
 822         case V4L2_CID_MPEG_VIDEO_H264_FMO:                      return "H264 Flexible MB Ordering";
 823         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:             return "H264 Map Type for FMO";
 824         case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP:          return "H264 FMO Number of Slice Groups";
 825         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION:     return "H264 FMO Direction of Change";
 826         case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE:          return "H264 FMO Size of 1st Slice Grp";
 827         case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH:           return "H264 FMO No. of Consecutive MBs";
 828         case V4L2_CID_MPEG_VIDEO_H264_ASO:                      return "H264 Arbitrary Slice Ordering";
 829         case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER:          return "H264 ASO Slice Order";
 830         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING:      return "Enable H264 Hierarchical Coding";
 831         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
 832         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
 833         case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
 834                                                                 return "H264 Set QP Value for HC Layers";
 835         case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
 836                                                                 return "H264 Constrained Intra Pred";
 837         case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET:   return "H264 Chroma QP Index Offset";
 838         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP:           return "H264 I-Frame Minimum QP Value";
 839         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP:           return "H264 I-Frame Maximum QP Value";
 840         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP:           return "H264 P-Frame Minimum QP Value";
 841         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP:           return "H264 P-Frame Maximum QP Value";
 842         case V4L2_CID_MPEG_VIDEO_H264_SPS:                      return "H264 Sequence Parameter Set";
 843         case V4L2_CID_MPEG_VIDEO_H264_PPS:                      return "H264 Picture Parameter Set";
 844         case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:           return "H264 Scaling Matrix";
 845         case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:             return "H264 Slice Parameters";
 846         case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:            return "H264 Decode Parameters";
 847         case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:                   return "MPEG2 Level";
 848         case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:                 return "MPEG2 Profile";
 849         case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
 850         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P-Frame QP Value";
 851         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B-Frame QP Value";
 852         case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP:                  return "MPEG4 Minimum QP Value";
 853         case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP:                  return "MPEG4 Maximum QP Value";
 854         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:                   return "MPEG4 Level";
 855         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:                 return "MPEG4 Profile";
 856         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:                    return "Quarter Pixel Search Enable";
 857         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:         return "Maximum Bytes in a Slice";
 858         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:            return "Number of MBs in a Slice";
 859         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:              return "Slice Partitioning Method";
 860         case V4L2_CID_MPEG_VIDEO_VBV_SIZE:                      return "VBV Buffer Size";
 861         case V4L2_CID_MPEG_VIDEO_DEC_PTS:                       return "Video Decoder PTS";
 862         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:                     return "Video Decoder Frame Count";
 863         case V4L2_CID_MPEG_VIDEO_VBV_DELAY:                     return "Initial Delay for VBV Control";
 864         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:             return "Horizontal MV Search Range";
 865         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:             return "Vertical MV Search Range";
 866         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:             return "Repeat Sequence Header";
 867         case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:               return "Force Key Frame";
 868         case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:            return "MPEG-2 Slice Parameters";
 869         case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:            return "MPEG-2 Quantization Matrices";
 870         case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:                   return "FWHT Stateless Parameters";
 871         case V4L2_CID_FWHT_I_FRAME_QP:                          return "FWHT I-Frame QP Value";
 872         case V4L2_CID_FWHT_P_FRAME_QP:                          return "FWHT P-Frame QP Value";
 873
 874         /* VPX controls */
 875         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:            return "VPX Number of Partitions";
 876         case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4:           return "VPX Intra Mode Decision Disable";
 877         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:            return "VPX No. of Refs for P Frame";
 878         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL:              return "VPX Loop Filter Level Range";
 879         case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS:          return "VPX Deblocking Effect Control";
 880         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD:   return "VPX Golden Frame Refresh Period";
 881         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:          return "VPX Golden Frame Indicator";
 882         case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP:                    return "VPX Minimum QP Value";
 883         case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP:                    return "VPX Maximum QP Value";
 884         case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP:                return "VPX I-Frame QP Value";
 885         case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:                return "VPX P-Frame QP Value";
 886         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:                   return "VP8 Profile";
 887         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:                   return "VP9 Profile";
 888
 889         /* HEVC controls */
 890         case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP:               return "HEVC I-Frame QP Value";
 891         case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP:               return "HEVC P-Frame QP Value";
 892         case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP:               return "HEVC B-Frame QP Value";
 893         case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP:                   return "HEVC Minimum QP Value";
 894         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP:                   return "HEVC Maximum QP Value";
 895         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:                  return "HEVC Profile";
 896         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:                    return "HEVC Level";
 897         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:                     return "HEVC Tier";
 898         case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION:    return "HEVC Frame Rate Resolution";
 899         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH:      return "HEVC Maximum Coding Unit Depth";
 900         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:             return "HEVC Refresh Type";
 901         case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED:         return "HEVC Constant Intra Prediction";
 902         case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU:              return "HEVC Lossless Encoding";
 903         case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT:                return "HEVC Wavefront";
 904         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:         return "HEVC Loop Filter";
 905         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP:                  return "HEVC QP Values";
 906         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:         return "HEVC Hierarchical Coding Type";
 907         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER:        return "HEVC Hierarchical Coding Layer";
 908         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP:        return "HEVC Hierarchical Layer 0 QP";
 909         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP:        return "HEVC Hierarchical Layer 1 QP";
 910         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP:        return "HEVC Hierarchical Layer 2 QP";
 911         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP:        return "HEVC Hierarchical Layer 3 QP";
 912         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP:        return "HEVC Hierarchical Layer 4 QP";
 913         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP:        return "HEVC Hierarchical Layer 5 QP";
 914         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP:        return "HEVC Hierarchical Layer 6 QP";
 915         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR:        return "HEVC Hierarchical Lay 0 BitRate";
 916         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR:        return "HEVC Hierarchical Lay 1 BitRate";
 917         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR:        return "HEVC Hierarchical Lay 2 BitRate";
 918         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR:        return "HEVC Hierarchical Lay 3 BitRate";
 919         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR:        return "HEVC Hierarchical Lay 4 BitRate";
 920         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR:        return "HEVC Hierarchical Lay 5 BitRate";
 921         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR:        return "HEVC Hierarchical Lay 6 BitRate";
 922         case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB:               return "HEVC General PB";
 923         case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID:              return "HEVC Temporal ID";
 924         case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING:         return "HEVC Strong Intra Smoothing";
 925         case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT:           return "HEVC Intra PU Split";
 926         case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION:           return "HEVC TMV Prediction";
 927         case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1:  return "HEVC Max Num of Candidate MVs";
 928         case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE:        return "HEVC ENC Without Startcode";
 929         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD:           return "HEVC Num of I-Frame b/w 2 IDR";
 930         case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2:      return "HEVC Loop Filter Beta Offset";
 931         case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2:        return "HEVC Loop Filter TC Offset";
 932         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:     return "HEVC Size of Length Field";
 933         case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES:        return "Reference Frames for a P-Frame";
 934         case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR:         return "Prepend SPS and PPS to IDR";
 935
 936         /* CAMERA controls */
 937         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 938         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 939         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 940         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 941         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 942         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 943         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 944         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 945         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 946         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 947         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 948         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 949         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 950         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic Continuous";
 951         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 952         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 953         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 954         case V4L2_CID_PRIVACY:                  return "Privacy";
 955         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 956         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 957         case V4L2_CID_AUTO_EXPOSURE_BIAS:       return "Auto Exposure, Bias";
 958         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
 959         case V4L2_CID_WIDE_DYNAMIC_RANGE:       return "Wide Dynamic Range";
 960         case V4L2_CID_IMAGE_STABILIZATION:      return "Image Stabilization";
 961         case V4L2_CID_ISO_SENSITIVITY:          return "ISO Sensitivity";
 962         case V4L2_CID_ISO_SENSITIVITY_AUTO:     return "ISO Sensitivity, Auto";
 963         case V4L2_CID_EXPOSURE_METERING:        return "Exposure, Metering Mode";
 964         case V4L2_CID_SCENE_MODE:               return "Scene Mode";
 965         case V4L2_CID_3A_LOCK:                  return "3A Lock";
 966         case V4L2_CID_AUTO_FOCUS_START:         return "Auto Focus, Start";
 967         case V4L2_CID_AUTO_FOCUS_STOP:          return "Auto Focus, Stop";
 968         case V4L2_CID_AUTO_FOCUS_STATUS:        return "Auto Focus, Status";
 969         case V4L2_CID_AUTO_FOCUS_RANGE:         return "Auto Focus, Range";
 970         case V4L2_CID_PAN_SPEED:                return "Pan, Speed";
 971         case V4L2_CID_TILT_SPEED:               return "Tilt, Speed";
 972
 973         /* FM Radio Modulator controls */
 974         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
 975         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 976         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 977         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 978         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 979         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 980         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 981         case V4L2_CID_RDS_TX_MONO_STEREO:       return "RDS Stereo";
 982         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:   return "RDS Artificial Head";
 983         case V4L2_CID_RDS_TX_COMPRESSED:        return "RDS Compressed";
 984         case V4L2_CID_RDS_TX_DYNAMIC_PTY:       return "RDS Dynamic PTY";
 985         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
 986         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
 987         case V4L2_CID_RDS_TX_MUSIC_SPEECH:      return "RDS Music";
 988         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:  return "RDS Enable Alt Frequencies";
 989         case V4L2_CID_RDS_TX_ALT_FREQS:         return "RDS Alternate Frequencies";
 990         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 991         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 992         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 993         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
 994         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 995         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 996         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 997         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 998         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 999         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
1000         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
1001         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-Emphasis";
1002         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
1003         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
1004
1005         /* Flash controls */
1006         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1007         case V4L2_CID_FLASH_CLASS:              return "Flash Controls";
1008         case V4L2_CID_FLASH_LED_MODE:           return "LED Mode";
1009         case V4L2_CID_FLASH_STROBE_SOURCE:      return "Strobe Source";
1010         case V4L2_CID_FLASH_STROBE:             return "Strobe";
1011         case V4L2_CID_FLASH_STROBE_STOP:        return "Stop Strobe";
1012         case V4L2_CID_FLASH_STROBE_STATUS:      return "Strobe Status";
1013         case V4L2_CID_FLASH_TIMEOUT:            return "Strobe Timeout";
1014         case V4L2_CID_FLASH_INTENSITY:          return "Intensity, Flash Mode";
1015         case V4L2_CID_FLASH_TORCH_INTENSITY:    return "Intensity, Torch Mode";
1016         case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
1017         case V4L2_CID_FLASH_FAULT:              return "Faults";
1018         case V4L2_CID_FLASH_CHARGE:             return "Charge";
1019         case V4L2_CID_FLASH_READY:              return "Ready to Strobe";
1020
1021         /* JPEG encoder controls */
1022         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1023         case V4L2_CID_JPEG_CLASS:               return "JPEG Compression Controls";
1024         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:  return "Chroma Subsampling";
1025         case V4L2_CID_JPEG_RESTART_INTERVAL:    return "Restart Interval";
1026         case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1027         case V4L2_CID_JPEG_ACTIVE_MARKER:       return "Active Markers";
1028
1029         /* Image source controls */
1030         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1031         case V4L2_CID_IMAGE_SOURCE_CLASS:       return "Image Source Controls";
1032         case V4L2_CID_VBLANK:                   return "Vertical Blanking";
1033         case V4L2_CID_HBLANK:                   return "Horizontal Blanking";
1034         case V4L2_CID_ANALOGUE_GAIN:            return "Analogue Gain";
1035         case V4L2_CID_TEST_PATTERN_RED:         return "Red Pixel Value";
1036         case V4L2_CID_TEST_PATTERN_GREENR:      return "Green (Red) Pixel Value";
1037         case V4L2_CID_TEST_PATTERN_BLUE:        return "Blue Pixel Value";
1038         case V4L2_CID_TEST_PATTERN_GREENB:      return "Green (Blue) Pixel Value";
1039
1040         /* Image processing controls */
1041         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1042         case V4L2_CID_IMAGE_PROC_CLASS:         return "Image Processing Controls";
1043         case V4L2_CID_LINK_FREQ:                return "Link Frequency";
1044         case V4L2_CID_PIXEL_RATE:               return "Pixel Rate";
1045         case V4L2_CID_TEST_PATTERN:             return "Test Pattern";
1046         case V4L2_CID_DEINTERLACING_MODE:       return "Deinterlacing Mode";
1047         case V4L2_CID_DIGITAL_GAIN:             return "Digital Gain";
1048
1049         /* DV controls */
1050         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1051         case V4L2_CID_DV_CLASS:                 return "Digital Video Controls";
1052         case V4L2_CID_DV_TX_HOTPLUG:            return "Hotplug Present";
1053         case V4L2_CID_DV_TX_RXSENSE:            return "RxSense Present";
1054         case V4L2_CID_DV_TX_EDID_PRESENT:       return "EDID Present";
1055         case V4L2_CID_DV_TX_MODE:               return "Transmit Mode";
1056         case V4L2_CID_DV_TX_RGB_RANGE:          return "Tx RGB Quantization Range";
1057         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:    return "Tx IT Content Type";
1058         case V4L2_CID_DV_RX_POWER_PRESENT:      return "Power Present";
1059         case V4L2_CID_DV_RX_RGB_RANGE:          return "Rx RGB Quantization Range";
1060         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:    return "Rx IT Content Type";
1061
1062         case V4L2_CID_FM_RX_CLASS:              return "FM Radio Receiver Controls";
1063         case V4L2_CID_TUNE_DEEMPHASIS:          return "De-Emphasis";
1064         case V4L2_CID_RDS_RECEPTION:            return "RDS Reception";
1065         case V4L2_CID_RF_TUNER_CLASS:           return "RF Tuner Controls";
1066         case V4L2_CID_RF_TUNER_RF_GAIN:         return "RF Gain";
1067         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:   return "LNA Gain, Auto";
1068         case V4L2_CID_RF_TUNER_LNA_GAIN:        return "LNA Gain";
1069         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1070         case V4L2_CID_RF_TUNER_MIXER_GAIN:      return "Mixer Gain";
1071         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:    return "IF Gain, Auto";
1072         case V4L2_CID_RF_TUNER_IF_GAIN:         return "IF Gain";
1073         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:  return "Bandwidth, Auto";
1074         case V4L2_CID_RF_TUNER_BANDWIDTH:       return "Bandwidth";
1075         case V4L2_CID_RF_TUNER_PLL_LOCK:        return "PLL Lock";
1076         case V4L2_CID_RDS_RX_PTY:               return "RDS Program Type";
1077         case V4L2_CID_RDS_RX_PS_NAME:           return "RDS PS Name";
1078         case V4L2_CID_RDS_RX_RADIO_TEXT:        return "RDS Radio Text";
1079         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1080         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:   return "RDS Traffic Program";
1081         case V4L2_CID_RDS_RX_MUSIC_SPEECH:      return "RDS Music";
1082
1083         /* Detection controls */
1084         /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1085         case V4L2_CID_DETECT_CLASS:             return "Detection Controls";
1086         case V4L2_CID_DETECT_MD_MODE:           return "Motion Detection Mode";
1087         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1088         case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1089         case V4L2_CID_DETECT_MD_REGION_GRID:    return "MD Region Grid";
1090         default:
1091                 return NULL;
1092         }
1093 }
1094 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1095
1096 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1097                     s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1098 {
1099         *name = v4l2_ctrl_get_name(id);
1100         *flags = 0;
1101
1102         switch (id) {
1103         case V4L2_CID_AUDIO_MUTE:
1104         case V4L2_CID_AUDIO_LOUDNESS:
1105         case V4L2_CID_AUTO_WHITE_BALANCE:
1106         case V4L2_CID_AUTOGAIN:
1107         case V4L2_CID_HFLIP:
1108         case V4L2_CID_VFLIP:
1109         case V4L2_CID_HUE_AUTO:
1110         case V4L2_CID_CHROMA_AGC:
1111         case V4L2_CID_COLOR_KILLER:
1112         case V4L2_CID_AUTOBRIGHTNESS:
1113         case V4L2_CID_MPEG_AUDIO_MUTE:
1114         case V4L2_CID_MPEG_VIDEO_MUTE:
1115         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1116         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1117         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1118         case V4L2_CID_FOCUS_AUTO:
1119         case V4L2_CID_PRIVACY:
1120         case V4L2_CID_AUDIO_LIMITER_ENABLED:
1121         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1122         case V4L2_CID_PILOT_TONE_ENABLED:
1123         case V4L2_CID_ILLUMINATORS_1:
1124         case V4L2_CID_ILLUMINATORS_2:
1125         case V4L2_CID_FLASH_STROBE_STATUS:
1126         case V4L2_CID_FLASH_CHARGE:
1127         case V4L2_CID_FLASH_READY:
1128         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1129         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1130         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1131         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1132         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1133         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1134         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1135         case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1136         case V4L2_CID_WIDE_DYNAMIC_RANGE:
1137         case V4L2_CID_IMAGE_STABILIZATION:
1138         case V4L2_CID_RDS_RECEPTION:
1139         case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1140         case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1141         case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1142         case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1143         case V4L2_CID_RF_TUNER_PLL_LOCK:
1144         case V4L2_CID_RDS_TX_MONO_STEREO:
1145         case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1146         case V4L2_CID_RDS_TX_COMPRESSED:
1147         case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1148         case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1149         case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1150         case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1151         case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1152         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1153         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1154         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1155                 *type = V4L2_CTRL_TYPE_BOOLEAN;
1156                 *min = 0;
1157                 *max = *step = 1;
1158                 break;
1159         case V4L2_CID_ROTATE:
1160                 *type = V4L2_CTRL_TYPE_INTEGER;
1161                 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1162                 break;
1163         case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1164         case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1165                 *type = V4L2_CTRL_TYPE_INTEGER;
1166                 break;
1167         case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1168         case V4L2_CID_PAN_RESET:
1169         case V4L2_CID_TILT_RESET:
1170         case V4L2_CID_FLASH_STROBE:
1171         case V4L2_CID_FLASH_STROBE_STOP:
1172         case V4L2_CID_AUTO_FOCUS_START:
1173         case V4L2_CID_AUTO_FOCUS_STOP:
1174         case V4L2_CID_DO_WHITE_BALANCE:
1175                 *type = V4L2_CTRL_TYPE_BUTTON;
1176                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1177                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1178                 *min = *max = *step = *def = 0;
1179                 break;
1180         case V4L2_CID_POWER_LINE_FREQUENCY:
1181         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1182         case V4L2_CID_MPEG_AUDIO_ENCODING:
1183         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1184         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1185         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1186         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1187         case V4L2_CID_MPEG_AUDIO_MODE:
1188         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1189         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1190         case V4L2_CID_MPEG_AUDIO_CRC:
1191         case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1192         case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1193         case V4L2_CID_MPEG_VIDEO_ENCODING:
1194         case V4L2_CID_MPEG_VIDEO_ASPECT:
1195         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1196         case V4L2_CID_MPEG_STREAM_TYPE:
1197         case V4L2_CID_MPEG_STREAM_VBI_FMT:
1198         case V4L2_CID_EXPOSURE_AUTO:
1199         case V4L2_CID_AUTO_FOCUS_RANGE:
1200         case V4L2_CID_COLORFX:
1201         case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1202         case V4L2_CID_TUNE_PREEMPHASIS:
1203         case V4L2_CID_FLASH_LED_MODE:
1204         case V4L2_CID_FLASH_STROBE_SOURCE:
1205         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1206         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1207         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1208         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1209         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1210         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1211         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1212         case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1213         case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1214         case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
1215         case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
1216         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1217         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1218         case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1219         case V4L2_CID_ISO_SENSITIVITY_AUTO:
1220         case V4L2_CID_EXPOSURE_METERING:
1221         case V4L2_CID_SCENE_MODE:
1222         case V4L2_CID_DV_TX_MODE:
1223         case V4L2_CID_DV_TX_RGB_RANGE:
1224         case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1225         case V4L2_CID_DV_RX_RGB_RANGE:
1226         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1227         case V4L2_CID_TEST_PATTERN:
1228         case V4L2_CID_DEINTERLACING_MODE:
1229         case V4L2_CID_TUNE_DEEMPHASIS:
1230         case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1231         case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1232         case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1233         case V4L2_CID_DETECT_MD_MODE:
1234         case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1235         case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1236         case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1237         case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1238         case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1239         case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1240         case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1241                 *type = V4L2_CTRL_TYPE_MENU;
1242                 break;
1243         case V4L2_CID_LINK_FREQ:
1244                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1245                 break;
1246         case V4L2_CID_RDS_TX_PS_NAME:
1247         case V4L2_CID_RDS_TX_RADIO_TEXT:
1248         case V4L2_CID_RDS_RX_PS_NAME:
1249         case V4L2_CID_RDS_RX_RADIO_TEXT:
1250                 *type = V4L2_CTRL_TYPE_STRING;
1251                 break;
1252         case V4L2_CID_ISO_SENSITIVITY:
1253         case V4L2_CID_AUTO_EXPOSURE_BIAS:
1254         case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1255         case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1256                 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1257                 break;
1258         case V4L2_CID_USER_CLASS:
1259         case V4L2_CID_CAMERA_CLASS:
1260         case V4L2_CID_MPEG_CLASS:
1261         case V4L2_CID_FM_TX_CLASS:
1262         case V4L2_CID_FLASH_CLASS:
1263         case V4L2_CID_JPEG_CLASS:
1264         case V4L2_CID_IMAGE_SOURCE_CLASS:
1265         case V4L2_CID_IMAGE_PROC_CLASS:
1266         case V4L2_CID_DV_CLASS:
1267         case V4L2_CID_FM_RX_CLASS:
1268         case V4L2_CID_RF_TUNER_CLASS:
1269         case V4L2_CID_DETECT_CLASS:
1270                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1271                 /* You can neither read not write these */
1272                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1273                 *min = *max = *step = *def = 0;
1274                 break;
1275         case V4L2_CID_BG_COLOR:
1276                 *type = V4L2_CTRL_TYPE_INTEGER;
1277                 *step = 1;
1278                 *min = 0;
1279                 /* Max is calculated as RGB888 that is 2^24 */
1280                 *max = 0xFFFFFF;
1281                 break;
1282         case V4L2_CID_FLASH_FAULT:
1283         case V4L2_CID_JPEG_ACTIVE_MARKER:
1284         case V4L2_CID_3A_LOCK:
1285         case V4L2_CID_AUTO_FOCUS_STATUS:
1286         case V4L2_CID_DV_TX_HOTPLUG:
1287         case V4L2_CID_DV_TX_RXSENSE:
1288         case V4L2_CID_DV_TX_EDID_PRESENT:
1289         case V4L2_CID_DV_RX_POWER_PRESENT:
1290                 *type = V4L2_CTRL_TYPE_BITMASK;
1291                 break;
1292         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1293         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1294                 *type = V4L2_CTRL_TYPE_INTEGER;
1295                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1296                 break;
1297         case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1298                 *type = V4L2_CTRL_TYPE_INTEGER64;
1299                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1300                 *min = *def = 0;
1301                 *max = 0x1ffffffffLL;
1302                 *step = 1;
1303                 break;
1304         case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1305                 *type = V4L2_CTRL_TYPE_INTEGER64;
1306                 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1307                 *min = *def = 0;
1308                 *max = 0x7fffffffffffffffLL;
1309                 *step = 1;
1310                 break;
1311         case V4L2_CID_PIXEL_RATE:
1312                 *type = V4L2_CTRL_TYPE_INTEGER64;
1313                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1314                 break;
1315         case V4L2_CID_DETECT_MD_REGION_GRID:
1316                 *type = V4L2_CTRL_TYPE_U8;
1317                 break;
1318         case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1319                 *type = V4L2_CTRL_TYPE_U16;
1320                 break;
1321         case V4L2_CID_RDS_TX_ALT_FREQS:
1322                 *type = V4L2_CTRL_TYPE_U32;
1323                 break;
1324         case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1325                 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1326                 break;
1327         case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1328                 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1329                 break;
1330         case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
1331                 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1332                 break;
1333         case V4L2_CID_MPEG_VIDEO_H264_SPS:
1334                 *type = V4L2_CTRL_TYPE_H264_SPS;
1335                 break;
1336         case V4L2_CID_MPEG_VIDEO_H264_PPS:
1337                 *type = V4L2_CTRL_TYPE_H264_PPS;
1338                 break;
1339         case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:
1340                 *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
1341                 break;
1342         case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:
1343                 *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
1344                 break;
1345         case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
1346                 *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
1347                 break;
1348         default:
1349                 *type = V4L2_CTRL_TYPE_INTEGER;
1350                 break;
1351         }
1352         switch (id) {
1353         case V4L2_CID_MPEG_AUDIO_ENCODING:
1354         case V4L2_CID_MPEG_AUDIO_MODE:
1355         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1356         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1357         case V4L2_CID_MPEG_STREAM_TYPE:
1358                 *flags |= V4L2_CTRL_FLAG_UPDATE;
1359                 break;
1360         case V4L2_CID_AUDIO_VOLUME:
1361         case V4L2_CID_AUDIO_BALANCE:
1362         case V4L2_CID_AUDIO_BASS:
1363         case V4L2_CID_AUDIO_TREBLE:
1364         case V4L2_CID_BRIGHTNESS:
1365         case V4L2_CID_CONTRAST:
1366         case V4L2_CID_SATURATION:
1367         case V4L2_CID_HUE:
1368         case V4L2_CID_RED_BALANCE:
1369         case V4L2_CID_BLUE_BALANCE:
1370         case V4L2_CID_GAMMA:
1371         case V4L2_CID_SHARPNESS:
1372         case V4L2_CID_CHROMA_GAIN:
1373         case V4L2_CID_RDS_TX_DEVIATION:
1374         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1375         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1376         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1377         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1378         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1379         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1380         case V4L2_CID_PILOT_TONE_DEVIATION:
1381         case V4L2_CID_PILOT_TONE_FREQUENCY:
1382         case V4L2_CID_TUNE_POWER_LEVEL:
1383         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1384         case V4L2_CID_RF_TUNER_RF_GAIN:
1385         case V4L2_CID_RF_TUNER_LNA_GAIN:
1386         case V4L2_CID_RF_TUNER_MIXER_GAIN:
1387         case V4L2_CID_RF_TUNER_IF_GAIN:
1388         case V4L2_CID_RF_TUNER_BANDWIDTH:
1389         case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1390                 *flags |= V4L2_CTRL_FLAG_SLIDER;
1391                 break;
1392         case V4L2_CID_PAN_RELATIVE:
1393         case V4L2_CID_TILT_RELATIVE:
1394         case V4L2_CID_FOCUS_RELATIVE:
1395         case V4L2_CID_IRIS_RELATIVE:
1396         case V4L2_CID_ZOOM_RELATIVE:
1397                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1398                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1399                 break;
1400         case V4L2_CID_FLASH_STROBE_STATUS:
1401         case V4L2_CID_AUTO_FOCUS_STATUS:
1402         case V4L2_CID_FLASH_READY:
1403         case V4L2_CID_DV_TX_HOTPLUG:
1404         case V4L2_CID_DV_TX_RXSENSE:
1405         case V4L2_CID_DV_TX_EDID_PRESENT:
1406         case V4L2_CID_DV_RX_POWER_PRESENT:
1407         case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1408         case V4L2_CID_RDS_RX_PTY:
1409         case V4L2_CID_RDS_RX_PS_NAME:
1410         case V4L2_CID_RDS_RX_RADIO_TEXT:
1411         case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1412         case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1413         case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1414                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1415                 break;
1416         case V4L2_CID_RF_TUNER_PLL_LOCK:
1417                 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1418                 break;
1419         }
1420 }
1421 EXPORT_SYMBOL(v4l2_ctrl_fill);
1422
1423 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1424 {
1425         u32 flags = ctrl->flags;
1426
1427         if (ctrl->is_ptr)
1428                 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1429
1430         return flags;
1431 }
1432
1433 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1434 {
1435         memset(ev, 0, sizeof(*ev));
1436         ev->type = V4L2_EVENT_CTRL;
1437         ev->id = ctrl->id;
1438         ev->u.ctrl.changes = changes;
1439         ev->u.ctrl.type = ctrl->type;
1440         ev->u.ctrl.flags = user_flags(ctrl);
1441         if (ctrl->is_ptr)
1442                 ev->u.ctrl.value64 = 0;
1443         else
1444                 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1445         ev->u.ctrl.minimum = ctrl->minimum;
1446         ev->u.ctrl.maximum = ctrl->maximum;
1447         if (ctrl->type == V4L2_CTRL_TYPE_MENU
1448             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1449                 ev->u.ctrl.step = 1;
1450         else
1451                 ev->u.ctrl.step = ctrl->step;
1452         ev->u.ctrl.default_value = ctrl->default_value;
1453 }
1454
1455 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1456 {
1457         struct v4l2_event ev;
1458         struct v4l2_subscribed_event *sev;
1459
1460         if (list_empty(&ctrl->ev_subs))
1461                 return;
1462         fill_event(&ev, ctrl, changes);
1463
1464         list_for_each_entry(sev, &ctrl->ev_subs, node)
1465                 if (sev->fh != fh ||
1466                     (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1467                         v4l2_event_queue_fh(sev->fh, &ev);
1468 }
1469
1470 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1471                       union v4l2_ctrl_ptr ptr1,
1472                       union v4l2_ctrl_ptr ptr2)
1473 {
1474         switch (ctrl->type) {
1475         case V4L2_CTRL_TYPE_BUTTON:
1476                 return false;
1477         case V4L2_CTRL_TYPE_STRING:
1478                 idx *= ctrl->elem_size;
1479                 /* strings are always 0-terminated */
1480                 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1481         case V4L2_CTRL_TYPE_INTEGER64:
1482                 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1483         case V4L2_CTRL_TYPE_U8:
1484                 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1485         case V4L2_CTRL_TYPE_U16:
1486                 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1487         case V4L2_CTRL_TYPE_U32:
1488                 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1489         default:
1490                 if (ctrl->is_int)
1491                         return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1492                 idx *= ctrl->elem_size;
1493                 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1494         }
1495 }
1496
1497 static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1498                               union v4l2_ctrl_ptr ptr)
1499 {
1500         struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1501         void *p = ptr.p + idx * ctrl->elem_size;
1502
1503         memset(p, 0, ctrl->elem_size);
1504
1505         /*
1506          * The cast is needed to get rid of a gcc warning complaining that
1507          * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
1508          * v4l2_ctrl_type enum.
1509          */
1510         switch ((u32)ctrl->type) {
1511         case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1512                 p_mpeg2_slice_params = p;
1513                 /* 4:2:0 */
1514                 p_mpeg2_slice_params->sequence.chroma_format = 1;
1515                 /* interlaced top field */
1516                 p_mpeg2_slice_params->picture.picture_structure = 1;
1517                 p_mpeg2_slice_params->picture.picture_coding_type =
1518                                         V4L2_MPEG2_PICTURE_CODING_TYPE_I;
1519                 break;
1520         }
1521 }
1522
1523 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1524                      union v4l2_ctrl_ptr ptr)
1525 {
1526         switch (ctrl->type) {
1527         case V4L2_CTRL_TYPE_STRING:
1528                 idx *= ctrl->elem_size;
1529                 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1530                 ptr.p_char[idx + ctrl->minimum] = '\0';
1531                 break;
1532         case V4L2_CTRL_TYPE_INTEGER64:
1533                 ptr.p_s64[idx] = ctrl->default_value;
1534                 break;
1535         case V4L2_CTRL_TYPE_INTEGER:
1536         case V4L2_CTRL_TYPE_INTEGER_MENU:
1537         case V4L2_CTRL_TYPE_MENU:
1538         case V4L2_CTRL_TYPE_BITMASK:
1539         case V4L2_CTRL_TYPE_BOOLEAN:
1540                 ptr.p_s32[idx] = ctrl->default_value;
1541                 break;
1542         case V4L2_CTRL_TYPE_BUTTON:
1543         case V4L2_CTRL_TYPE_CTRL_CLASS:
1544                 ptr.p_s32[idx] = 0;
1545                 break;
1546         case V4L2_CTRL_TYPE_U8:
1547                 ptr.p_u8[idx] = ctrl->default_value;
1548                 break;
1549         case V4L2_CTRL_TYPE_U16:
1550                 ptr.p_u16[idx] = ctrl->default_value;
1551                 break;
1552         case V4L2_CTRL_TYPE_U32:
1553                 ptr.p_u32[idx] = ctrl->default_value;
1554                 break;
1555         default:
1556                 std_init_compound(ctrl, idx, ptr);
1557                 break;
1558         }
1559 }
1560
1561 static void std_log(const struct v4l2_ctrl *ctrl)
1562 {
1563         union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1564
1565         if (ctrl->is_array) {
1566                 unsigned i;
1567
1568                 for (i = 0; i < ctrl->nr_of_dims; i++)
1569                         pr_cont("[%u]", ctrl->dims[i]);
1570                 pr_cont(" ");
1571         }
1572
1573         switch (ctrl->type) {
1574         case V4L2_CTRL_TYPE_INTEGER:
1575                 pr_cont("%d", *ptr.p_s32);
1576                 break;
1577         case V4L2_CTRL_TYPE_BOOLEAN:
1578                 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1579                 break;
1580         case V4L2_CTRL_TYPE_MENU:
1581                 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1582                 break;
1583         case V4L2_CTRL_TYPE_INTEGER_MENU:
1584                 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1585                 break;
1586         case V4L2_CTRL_TYPE_BITMASK:
1587                 pr_cont("0x%08x", *ptr.p_s32);
1588                 break;
1589         case V4L2_CTRL_TYPE_INTEGER64:
1590                 pr_cont("%lld", *ptr.p_s64);
1591                 break;
1592         case V4L2_CTRL_TYPE_STRING:
1593                 pr_cont("%s", ptr.p_char);
1594                 break;
1595         case V4L2_CTRL_TYPE_U8:
1596                 pr_cont("%u", (unsigned)*ptr.p_u8);
1597                 break;
1598         case V4L2_CTRL_TYPE_U16:
1599                 pr_cont("%u", (unsigned)*ptr.p_u16);
1600                 break;
1601         case V4L2_CTRL_TYPE_U32:
1602                 pr_cont("%u", (unsigned)*ptr.p_u32);
1603                 break;
1604         default:
1605                 pr_cont("unknown type %d", ctrl->type);
1606                 break;
1607         }
1608 }
1609
1610 /*
1611  * Round towards the closest legal value. Be careful when we are
1612  * close to the maximum range of the control type to prevent
1613  * wrap-arounds.
1614  */
1615 #define ROUND_TO_RANGE(val, offset_type, ctrl)                  \
1616 ({                                                              \
1617         offset_type offset;                                     \
1618         if ((ctrl)->maximum >= 0 &&                             \
1619             val >= (ctrl)->maximum - (s32)((ctrl)->step / 2))   \
1620                 val = (ctrl)->maximum;                          \
1621         else                                                    \
1622                 val += (s32)((ctrl)->step / 2);                 \
1623         val = clamp_t(typeof(val), val,                         \
1624                       (ctrl)->minimum, (ctrl)->maximum);        \
1625         offset = (val) - (ctrl)->minimum;                       \
1626         offset = (ctrl)->step * (offset / (u32)(ctrl)->step);   \
1627         val = (ctrl)->minimum + offset;                         \
1628         0;                                                      \
1629 })
1630
1631 /* Validate a new control */
1632 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1633                         union v4l2_ctrl_ptr ptr)
1634 {
1635         struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1636         size_t len;
1637         u64 offset;
1638         s64 val;
1639
1640         switch ((u32)ctrl->type) {
1641         case V4L2_CTRL_TYPE_INTEGER:
1642                 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1643         case V4L2_CTRL_TYPE_INTEGER64:
1644                 /*
1645                  * We can't use the ROUND_TO_RANGE define here due to
1646                  * the u64 divide that needs special care.
1647                  */
1648                 val = ptr.p_s64[idx];
1649                 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1650                         val = ctrl->maximum;
1651                 else
1652                         val += (s64)(ctrl->step / 2);
1653                 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1654                 offset = val - ctrl->minimum;
1655                 do_div(offset, ctrl->step);
1656                 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1657                 return 0;
1658         case V4L2_CTRL_TYPE_U8:
1659                 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1660         case V4L2_CTRL_TYPE_U16:
1661                 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1662         case V4L2_CTRL_TYPE_U32:
1663                 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1664
1665         case V4L2_CTRL_TYPE_BOOLEAN:
1666                 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1667                 return 0;
1668
1669         case V4L2_CTRL_TYPE_MENU:
1670         case V4L2_CTRL_TYPE_INTEGER_MENU:
1671                 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1672                         return -ERANGE;
1673                 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
1674                         return -EINVAL;
1675                 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1676                     ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1677                         return -EINVAL;
1678                 return 0;
1679
1680         case V4L2_CTRL_TYPE_BITMASK:
1681                 ptr.p_s32[idx] &= ctrl->maximum;
1682                 return 0;
1683
1684         case V4L2_CTRL_TYPE_BUTTON:
1685         case V4L2_CTRL_TYPE_CTRL_CLASS:
1686                 ptr.p_s32[idx] = 0;
1687                 return 0;
1688
1689         case V4L2_CTRL_TYPE_STRING:
1690                 idx *= ctrl->elem_size;
1691                 len = strlen(ptr.p_char + idx);
1692                 if (len < ctrl->minimum)
1693                         return -ERANGE;
1694                 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1695                         return -ERANGE;
1696                 return 0;
1697
1698         case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1699                 p_mpeg2_slice_params = ptr.p;
1700
1701                 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1702                 case 1: /* 4:2:0 */
1703                 case 2: /* 4:2:2 */
1704                 case 3: /* 4:4:4 */
1705                         break;
1706                 default:
1707                         return -EINVAL;
1708                 }
1709
1710                 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1711                 case 0: /* 8 bits */
1712                 case 1: /* 9 bits */
1713                 case 2: /* 10 bits */
1714                 case 3: /* 11 bits */
1715                         break;
1716                 default:
1717                         return -EINVAL;
1718                 }
1719
1720                 switch (p_mpeg2_slice_params->picture.picture_structure) {
1721                 case 1: /* interlaced top field */
1722                 case 2: /* interlaced bottom field */
1723                 case 3: /* progressive */
1724                         break;
1725                 default:
1726                         return -EINVAL;
1727                 }
1728
1729                 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1730                 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1731                 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1732                 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1733                         break;
1734                 default:
1735                         return -EINVAL;
1736                 }
1737
1738                 return 0;
1739
1740         case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1741                 return 0;
1742
1743         case V4L2_CTRL_TYPE_FWHT_PARAMS:
1744                 return 0;
1745
1746         case V4L2_CTRL_TYPE_H264_SPS:
1747         case V4L2_CTRL_TYPE_H264_PPS:
1748         case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1749         case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1750         case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
1751                 return 0;
1752
1753         default:
1754                 return -EINVAL;
1755         }
1756 }
1757
1758 static const struct v4l2_ctrl_type_ops std_type_ops = {
1759         .equal = std_equal,
1760         .init = std_init,
1761         .log = std_log,
1762         .validate = std_validate,
1763 };
1764
1765 /* Helper function: copy the given control value back to the caller */
1766 static int ptr_to_user(struct v4l2_ext_control *c,
1767                        struct v4l2_ctrl *ctrl,
1768                        union v4l2_ctrl_ptr ptr)
1769 {
1770         u32 len;
1771
1772         if (ctrl->is_ptr && !ctrl->is_string)
1773                 return copy_to_user(c->ptr, ptr.p, c->size) ?
1774                        -EFAULT : 0;
1775
1776         switch (ctrl->type) {
1777         case V4L2_CTRL_TYPE_STRING:
1778                 len = strlen(ptr.p_char);
1779                 if (c->size < len + 1) {
1780                         c->size = ctrl->elem_size;
1781                         return -ENOSPC;
1782                 }
1783                 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1784                        -EFAULT : 0;
1785         case V4L2_CTRL_TYPE_INTEGER64:
1786                 c->value64 = *ptr.p_s64;
1787                 break;
1788         default:
1789                 c->value = *ptr.p_s32;
1790                 break;
1791         }
1792         return 0;
1793 }
1794
1795 /* Helper function: copy the current control value back to the caller */
1796 static int cur_to_user(struct v4l2_ext_control *c,
1797                        struct v4l2_ctrl *ctrl)
1798 {
1799         return ptr_to_user(c, ctrl, ctrl->p_cur);
1800 }
1801
1802 /* Helper function: copy the new control value back to the caller */
1803 static int new_to_user(struct v4l2_ext_control *c,
1804                        struct v4l2_ctrl *ctrl)
1805 {
1806         return ptr_to_user(c, ctrl, ctrl->p_new);
1807 }
1808
1809 /* Helper function: copy the request value back to the caller */
1810 static int req_to_user(struct v4l2_ext_control *c,
1811                        struct v4l2_ctrl_ref *ref)
1812 {
1813         return ptr_to_user(c, ref->ctrl, ref->p_req);
1814 }
1815
1816 /* Helper function: copy the initial control value back to the caller */
1817 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1818 {
1819         int idx;
1820
1821         for (idx = 0; idx < ctrl->elems; idx++)
1822                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1823
1824         return ptr_to_user(c, ctrl, ctrl->p_new);
1825 }
1826
1827 /* Helper function: copy the caller-provider value to the given control value */
1828 static int user_to_ptr(struct v4l2_ext_control *c,
1829                        struct v4l2_ctrl *ctrl,
1830                        union v4l2_ctrl_ptr ptr)
1831 {
1832         int ret;
1833         u32 size;
1834
1835         ctrl->is_new = 1;
1836         if (ctrl->is_ptr && !ctrl->is_string) {
1837                 unsigned idx;
1838
1839                 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1840                 if (ret || !ctrl->is_array)
1841                         return ret;
1842                 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1843                         ctrl->type_ops->init(ctrl, idx, ptr);
1844                 return 0;
1845         }
1846
1847         switch (ctrl->type) {
1848         case V4L2_CTRL_TYPE_INTEGER64:
1849                 *ptr.p_s64 = c->value64;
1850                 break;
1851         case V4L2_CTRL_TYPE_STRING:
1852                 size = c->size;
1853                 if (size == 0)
1854                         return -ERANGE;
1855                 if (size > ctrl->maximum + 1)
1856                         size = ctrl->maximum + 1;
1857                 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1858                 if (!ret) {
1859                         char last = ptr.p_char[size - 1];
1860
1861                         ptr.p_char[size - 1] = 0;
1862                         /* If the string was longer than ctrl->maximum,
1863                            then return an error. */
1864                         if (strlen(ptr.p_char) == ctrl->maximum && last)
1865                                 return -ERANGE;
1866                 }
1867                 return ret;
1868         default:
1869                 *ptr.p_s32 = c->value;
1870                 break;
1871         }
1872         return 0;
1873 }
1874
1875 /* Helper function: copy the caller-provider value as the new control value */
1876 static int user_to_new(struct v4l2_ext_control *c,
1877                        struct v4l2_ctrl *ctrl)
1878 {
1879         return user_to_ptr(c, ctrl, ctrl->p_new);
1880 }
1881
1882 /* Copy the one value to another. */
1883 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1884                        union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1885 {
1886         if (ctrl == NULL)
1887                 return;
1888         memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1889 }
1890
1891 /* Copy the new value to the current value. */
1892 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1893 {
1894         bool changed;
1895
1896         if (ctrl == NULL)
1897                 return;
1898
1899         /* has_changed is set by cluster_changed */
1900         changed = ctrl->has_changed;
1901         if (changed)
1902                 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1903
1904         if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1905                 /* Note: CH_FLAGS is only set for auto clusters. */
1906                 ctrl->flags &=
1907                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1908                 if (!is_cur_manual(ctrl->cluster[0])) {
1909                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1910                         if (ctrl->cluster[0]->has_volatiles)
1911                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1912                 }
1913                 fh = NULL;
1914         }
1915         if (changed || ch_flags) {
1916                 /* If a control was changed that was not one of the controls
1917                    modified by the application, then send the event to all. */
1918                 if (!ctrl->is_new)
1919                         fh = NULL;
1920                 send_event(fh, ctrl,
1921                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1922                 if (ctrl->call_notify && changed && ctrl->handler->notify)
1923                         ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1924         }
1925 }
1926
1927 /* Copy the current value to the new value */
1928 static void cur_to_new(struct v4l2_ctrl *ctrl)
1929 {
1930         if (ctrl == NULL)
1931                 return;
1932         ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1933 }
1934
1935 /* Copy the new value to the request value */
1936 static void new_to_req(struct v4l2_ctrl_ref *ref)
1937 {
1938         if (!ref)
1939                 return;
1940         ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
1941         ref->req = ref;
1942 }
1943
1944 /* Copy the request value to the new value */
1945 static void req_to_new(struct v4l2_ctrl_ref *ref)
1946 {
1947         if (!ref)
1948                 return;
1949         if (ref->req)
1950                 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
1951         else
1952                 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
1953 }
1954
1955 /* Return non-zero if one or more of the controls in the cluster has a new
1956    value that differs from the current value. */
1957 static int cluster_changed(struct v4l2_ctrl *master)
1958 {
1959         bool changed = false;
1960         unsigned idx;
1961         int i;
1962
1963         for (i = 0; i < master->ncontrols; i++) {
1964                 struct v4l2_ctrl *ctrl = master->cluster[i];
1965                 bool ctrl_changed = false;
1966
1967                 if (ctrl == NULL)
1968                         continue;
1969
1970                 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1971                         changed = ctrl_changed = true;
1972
1973                 /*
1974                  * Set has_changed to false to avoid generating
1975                  * the event V4L2_EVENT_CTRL_CH_VALUE
1976                  */
1977                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1978                         ctrl->has_changed = false;
1979                         continue;
1980                 }
1981
1982                 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1983                         ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1984                                 ctrl->p_cur, ctrl->p_new);
1985                 ctrl->has_changed = ctrl_changed;
1986                 changed |= ctrl->has_changed;
1987         }
1988         return changed;
1989 }
1990
1991 /* Control range checking */
1992 static int check_range(enum v4l2_ctrl_type type,
1993                 s64 min, s64 max, u64 step, s64 def)
1994 {
1995         switch (type) {
1996         case V4L2_CTRL_TYPE_BOOLEAN:
1997                 if (step != 1 || max > 1 || min < 0)
1998                         return -ERANGE;
1999                 /* fall through */
2000         case V4L2_CTRL_TYPE_U8:
2001         case V4L2_CTRL_TYPE_U16:
2002         case V4L2_CTRL_TYPE_U32:
2003         case V4L2_CTRL_TYPE_INTEGER:
2004         case V4L2_CTRL_TYPE_INTEGER64:
2005                 if (step == 0 || min > max || def < min || def > max)
2006                         return -ERANGE;
2007                 return 0;
2008         case V4L2_CTRL_TYPE_BITMASK:
2009                 if (step || min || !max || (def & ~max))
2010                         return -ERANGE;
2011                 return 0;
2012         case V4L2_CTRL_TYPE_MENU:
2013         case V4L2_CTRL_TYPE_INTEGER_MENU:
2014                 if (min > max || def < min || def > max)
2015                         return -ERANGE;
2016                 /* Note: step == menu_skip_mask for menu controls.
2017                    So here we check if the default value is masked out. */
2018                 if (step && ((1 << def) & step))
2019                         return -EINVAL;
2020                 return 0;
2021         case V4L2_CTRL_TYPE_STRING:
2022                 if (min > max || min < 0 || step < 1 || def)
2023                         return -ERANGE;
2024                 return 0;
2025         default:
2026                 return 0;
2027         }
2028 }
2029
2030 /* Validate a new control */
2031 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
2032 {
2033         unsigned idx;
2034         int err = 0;
2035
2036         for (idx = 0; !err && idx < ctrl->elems; idx++)
2037                 err = ctrl->type_ops->validate(ctrl, idx, p_new);
2038         return err;
2039 }
2040
2041 static inline u32 node2id(struct list_head *node)
2042 {
2043         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
2044 }
2045
2046 /* Set the handler's error code if it wasn't set earlier already */
2047 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
2048 {
2049         if (hdl->error == 0)
2050                 hdl->error = err;
2051         return err;
2052 }
2053
2054 /* Initialize the handler */
2055 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
2056                                  unsigned nr_of_controls_hint,
2057                                  struct lock_class_key *key, const char *name)
2058 {
2059         mutex_init(&hdl->_lock);
2060         hdl->lock = &hdl->_lock;
2061         lockdep_set_class_and_name(hdl->lock, key, name);
2062         INIT_LIST_HEAD(&hdl->ctrls);
2063         INIT_LIST_HEAD(&hdl->ctrl_refs);
2064         INIT_LIST_HEAD(&hdl->requests);
2065         INIT_LIST_HEAD(&hdl->requests_queued);
2066         hdl->request_is_queued = false;
2067         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
2068         hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
2069                                       sizeof(hdl->buckets[0]),
2070                                       GFP_KERNEL | __GFP_ZERO);
2071         hdl->error = hdl->buckets ? 0 : -ENOMEM;
2072         media_request_object_init(&hdl->req_obj);
2073         return hdl->error;
2074 }
2075 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
2076
2077 /* Free all controls and control refs */
2078 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
2079 {
2080         struct v4l2_ctrl_ref *ref, *next_ref;
2081         struct v4l2_ctrl *ctrl, *next_ctrl;
2082         struct v4l2_subscribed_event *sev, *next_sev;
2083
2084         if (hdl == NULL || hdl->buckets == NULL)
2085                 return;
2086
2087         if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2088                 struct v4l2_ctrl_handler *req, *next_req;
2089
2090                 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2091                         media_request_object_unbind(&req->req_obj);
2092                         media_request_object_put(&req->req_obj);
2093                 }
2094         }
2095         mutex_lock(hdl->lock);
2096         /* Free all nodes */
2097         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2098                 list_del(&ref->node);
2099                 kfree(ref);
2100         }
2101         /* Free all controls owned by the handler */
2102         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2103                 list_del(&ctrl->node);
2104                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2105                         list_del(&sev->node);
2106                 kvfree(ctrl);
2107         }
2108         kvfree(hdl->buckets);
2109         hdl->buckets = NULL;
2110         hdl->cached = NULL;
2111         hdl->error = 0;
2112         mutex_unlock(hdl->lock);
2113         mutex_destroy(&hdl->_lock);
2114 }
2115 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2116
2117 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2118    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2119    with applications that do not use the NEXT_CTRL flag.
2120
2121    We just find the n-th private user control. It's O(N), but that should not
2122    be an issue in this particular case. */
2123 static struct v4l2_ctrl_ref *find_private_ref(
2124                 struct v4l2_ctrl_handler *hdl, u32 id)
2125 {
2126         struct v4l2_ctrl_ref *ref;
2127
2128         id -= V4L2_CID_PRIVATE_BASE;
2129         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2130                 /* Search for private user controls that are compatible with
2131                    VIDIOC_G/S_CTRL. */
2132                 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2133                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2134                         if (!ref->ctrl->is_int)
2135                                 continue;
2136                         if (id == 0)
2137                                 return ref;
2138                         id--;
2139                 }
2140         }
2141         return NULL;
2142 }
2143
2144 /* Find a control with the given ID. */
2145 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2146 {
2147         struct v4l2_ctrl_ref *ref;
2148         int bucket;
2149
2150         id &= V4L2_CTRL_ID_MASK;
2151
2152         /* Old-style private controls need special handling */
2153         if (id >= V4L2_CID_PRIVATE_BASE)
2154                 return find_private_ref(hdl, id);
2155         bucket = id % hdl->nr_of_buckets;
2156
2157         /* Simple optimization: cache the last control found */
2158         if (hdl->cached && hdl->cached->ctrl->id == id)
2159                 return hdl->cached;
2160
2161         /* Not in cache, search the hash */
2162         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2163         while (ref && ref->ctrl->id != id)
2164                 ref = ref->next;
2165
2166         if (ref)
2167                 hdl->cached = ref; /* cache it! */
2168         return ref;
2169 }
2170
2171 /* Find a control with the given ID. Take the handler's lock first. */
2172 static struct v4l2_ctrl_ref *find_ref_lock(
2173                 struct v4l2_ctrl_handler *hdl, u32 id)
2174 {
2175         struct v4l2_ctrl_ref *ref = NULL;
2176
2177         if (hdl) {
2178                 mutex_lock(hdl->lock);
2179                 ref = find_ref(hdl, id);
2180                 mutex_unlock(hdl->lock);
2181         }
2182         return ref;
2183 }
2184
2185 /* Find a control with the given ID. */
2186 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2187 {
2188         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2189
2190         return ref ? ref->ctrl : NULL;
2191 }
2192 EXPORT_SYMBOL(v4l2_ctrl_find);
2193
2194 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
2195 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2196                            struct v4l2_ctrl *ctrl,
2197                            struct v4l2_ctrl_ref **ctrl_ref,
2198                            bool from_other_dev, bool allocate_req)
2199 {
2200         struct v4l2_ctrl_ref *ref;
2201         struct v4l2_ctrl_ref *new_ref;
2202         u32 id = ctrl->id;
2203         u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2204         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
2205         unsigned int size_extra_req = 0;
2206
2207         if (ctrl_ref)
2208                 *ctrl_ref = NULL;
2209
2210         /*
2211          * Automatically add the control class if it is not yet present and
2212          * the new control is not a compound control.
2213          */
2214         if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2215             id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2216                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2217                         return hdl->error;
2218
2219         if (hdl->error)
2220                 return hdl->error;
2221
2222         if (allocate_req)
2223                 size_extra_req = ctrl->elems * ctrl->elem_size;
2224         new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2225         if (!new_ref)
2226                 return handler_set_err(hdl, -ENOMEM);
2227         new_ref->ctrl = ctrl;
2228         new_ref->from_other_dev = from_other_dev;
2229         if (size_extra_req)
2230                 new_ref->p_req.p = &new_ref[1];
2231
2232         INIT_LIST_HEAD(&new_ref->node);
2233
2234         mutex_lock(hdl->lock);
2235
2236         /* Add immediately at the end of the list if the list is empty, or if
2237            the last element in the list has a lower ID.
2238            This ensures that when elements are added in ascending order the
2239            insertion is an O(1) operation. */
2240         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2241                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2242                 goto insert_in_hash;
2243         }
2244
2245         /* Find insert position in sorted list */
2246         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2247                 if (ref->ctrl->id < id)
2248                         continue;
2249                 /* Don't add duplicates */
2250                 if (ref->ctrl->id == id) {
2251                         kfree(new_ref);
2252                         goto unlock;
2253                 }
2254                 list_add(&new_ref->node, ref->node.prev);
2255                 break;
2256         }
2257
2258 insert_in_hash:
2259         /* Insert the control node in the hash */
2260         new_ref->next = hdl->buckets[bucket];
2261         hdl->buckets[bucket] = new_ref;
2262         if (ctrl_ref)
2263                 *ctrl_ref = new_ref;
2264         if (ctrl->handler == hdl) {
2265                 /* By default each control starts in a cluster of its own.
2266                  * new_ref->ctrl is basically a cluster array with one
2267                  * element, so that's perfect to use as the cluster pointer.
2268                  * But only do this for the handler that owns the control.
2269                  */
2270                 ctrl->cluster = &new_ref->ctrl;
2271                 ctrl->ncontrols = 1;
2272         }
2273
2274 unlock:
2275         mutex_unlock(hdl->lock);
2276         return 0;
2277 }
2278
2279 /* Add a new control */
2280 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2281                         const struct v4l2_ctrl_ops *ops,
2282                         const struct v4l2_ctrl_type_ops *type_ops,
2283                         u32 id, const char *name, enum v4l2_ctrl_type type,
2284                         s64 min, s64 max, u64 step, s64 def,
2285                         const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2286                         u32 flags, const char * const *qmenu,
2287                         const s64 *qmenu_int, void *priv)
2288 {
2289         struct v4l2_ctrl *ctrl;
2290         unsigned sz_extra;
2291         unsigned nr_of_dims = 0;
2292         unsigned elems = 1;
2293         bool is_array;
2294         unsigned tot_ctrl_size;
2295         unsigned idx;
2296         void *data;
2297         int err;
2298
2299         if (hdl->error)
2300                 return NULL;
2301
2302         while (dims && dims[nr_of_dims]) {
2303                 elems *= dims[nr_of_dims];
2304                 nr_of_dims++;
2305                 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2306                         break;
2307         }
2308         is_array = nr_of_dims > 0;
2309
2310         /* Prefill elem_size for all types handled by std_type_ops */
2311         switch ((u32)type) {
2312         case V4L2_CTRL_TYPE_INTEGER64:
2313                 elem_size = sizeof(s64);
2314                 break;
2315         case V4L2_CTRL_TYPE_STRING:
2316                 elem_size = max + 1;
2317                 break;
2318         case V4L2_CTRL_TYPE_U8:
2319                 elem_size = sizeof(u8);
2320                 break;
2321         case V4L2_CTRL_TYPE_U16:
2322                 elem_size = sizeof(u16);
2323                 break;
2324         case V4L2_CTRL_TYPE_U32:
2325                 elem_size = sizeof(u32);
2326                 break;
2327         case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2328                 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2329                 break;
2330         case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2331                 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2332                 break;
2333         case V4L2_CTRL_TYPE_FWHT_PARAMS:
2334                 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2335                 break;
2336         case V4L2_CTRL_TYPE_H264_SPS:
2337                 elem_size = sizeof(struct v4l2_ctrl_h264_sps);
2338                 break;
2339         case V4L2_CTRL_TYPE_H264_PPS:
2340                 elem_size = sizeof(struct v4l2_ctrl_h264_pps);
2341                 break;
2342         case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
2343                 elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
2344                 break;
2345         case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
2346                 elem_size = sizeof(struct v4l2_ctrl_h264_slice_params);
2347                 break;
2348         case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2349                 elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
2350                 break;
2351         default:
2352                 if (type < V4L2_CTRL_COMPOUND_TYPES)
2353                         elem_size = sizeof(s32);
2354                 break;
2355         }
2356         tot_ctrl_size = elem_size * elems;
2357
2358         /* Sanity checks */
2359         if (id == 0 || name == NULL || !elem_size ||
2360             id >= V4L2_CID_PRIVATE_BASE ||
2361             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2362             (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2363                 handler_set_err(hdl, -ERANGE);
2364                 return NULL;
2365         }
2366         err = check_range(type, min, max, step, def);
2367         if (err) {
2368                 handler_set_err(hdl, err);
2369                 return NULL;
2370         }
2371         if (is_array &&
2372             (type == V4L2_CTRL_TYPE_BUTTON ||
2373              type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2374                 handler_set_err(hdl, -EINVAL);
2375                 return NULL;
2376         }
2377
2378         sz_extra = 0;
2379         if (type == V4L2_CTRL_TYPE_BUTTON)
2380                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2381                         V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2382         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2383                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2384         else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2385                  type == V4L2_CTRL_TYPE_STRING ||
2386                  type >= V4L2_CTRL_COMPOUND_TYPES ||
2387                  is_array)
2388                 sz_extra += 2 * tot_ctrl_size;
2389
2390         ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2391         if (ctrl == NULL) {
2392                 handler_set_err(hdl, -ENOMEM);
2393                 return NULL;
2394         }
2395
2396         INIT_LIST_HEAD(&ctrl->node);
2397         INIT_LIST_HEAD(&ctrl->ev_subs);
2398         ctrl->handler = hdl;
2399         ctrl->ops = ops;
2400         ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2401         ctrl->id = id;
2402         ctrl->name = name;
2403         ctrl->type = type;
2404         ctrl->flags = flags;
2405         ctrl->minimum = min;
2406         ctrl->maximum = max;
2407         ctrl->step = step;
2408         ctrl->default_value = def;
2409         ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2410         ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2411         ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2412         ctrl->is_array = is_array;
2413         ctrl->elems = elems;
2414         ctrl->nr_of_dims = nr_of_dims;
2415         if (nr_of_dims)
2416                 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2417         ctrl->elem_size = elem_size;
2418         if (type == V4L2_CTRL_TYPE_MENU)
2419                 ctrl->qmenu = qmenu;
2420         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2421                 ctrl->qmenu_int = qmenu_int;
2422         ctrl->priv = priv;
2423         ctrl->cur.val = ctrl->val = def;
2424         data = &ctrl[1];
2425
2426         if (!ctrl->is_int) {
2427                 ctrl->p_new.p = data;
2428                 ctrl->p_cur.p = data + tot_ctrl_size;
2429         } else {
2430                 ctrl->p_new.p = &ctrl->val;
2431                 ctrl->p_cur.p = &ctrl->cur.val;
2432         }
2433         for (idx = 0; idx < elems; idx++) {
2434                 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2435                 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2436         }
2437
2438         if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2439                 kvfree(ctrl);
2440                 return NULL;
2441         }
2442         mutex_lock(hdl->lock);
2443         list_add_tail(&ctrl->node, &hdl->ctrls);
2444         mutex_unlock(hdl->lock);
2445         return ctrl;
2446 }
2447
2448 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2449                         const struct v4l2_ctrl_config *cfg, void *priv)
2450 {
2451         bool is_menu;
2452         struct v4l2_ctrl *ctrl;
2453         const char *name = cfg->name;
2454         const char * const *qmenu = cfg->qmenu;
2455         const s64 *qmenu_int = cfg->qmenu_int;
2456         enum v4l2_ctrl_type type = cfg->type;
2457         u32 flags = cfg->flags;
2458         s64 min = cfg->min;
2459         s64 max = cfg->max;
2460         u64 step = cfg->step;
2461         s64 def = cfg->def;
2462
2463         if (name == NULL)
2464                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2465                                                                 &def, &flags);
2466
2467         is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2468                    type == V4L2_CTRL_TYPE_INTEGER_MENU);
2469         if (is_menu)
2470                 WARN_ON(step);
2471         else
2472                 WARN_ON(cfg->menu_skip_mask);
2473         if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2474                 qmenu = v4l2_ctrl_get_menu(cfg->id);
2475         } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2476                 handler_set_err(hdl, -EINVAL);
2477                 return NULL;
2478         }
2479
2480         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2481                         type, min, max,
2482                         is_menu ? cfg->menu_skip_mask : step, def,
2483                         cfg->dims, cfg->elem_size,
2484                         flags, qmenu, qmenu_int, priv);
2485         if (ctrl)
2486                 ctrl->is_private = cfg->is_private;
2487         return ctrl;
2488 }
2489 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2490
2491 /* Helper function for standard non-menu controls */
2492 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2493                         const struct v4l2_ctrl_ops *ops,
2494                         u32 id, s64 min, s64 max, u64 step, s64 def)
2495 {
2496         const char *name;
2497         enum v4l2_ctrl_type type;
2498         u32 flags;
2499
2500         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2501         if (type == V4L2_CTRL_TYPE_MENU ||
2502             type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2503             type >= V4L2_CTRL_COMPOUND_TYPES) {
2504                 handler_set_err(hdl, -EINVAL);
2505                 return NULL;
2506         }
2507         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2508                              min, max, step, def, NULL, 0,
2509                              flags, NULL, NULL, NULL);
2510 }
2511 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2512
2513 /* Helper function for standard menu controls */
2514 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2515                         const struct v4l2_ctrl_ops *ops,
2516                         u32 id, u8 _max, u64 mask, u8 _def)
2517 {
2518         const char * const *qmenu = NULL;
2519         const s64 *qmenu_int = NULL;
2520         unsigned int qmenu_int_len = 0;
2521         const char *name;
2522         enum v4l2_ctrl_type type;
2523         s64 min;
2524         s64 max = _max;
2525         s64 def = _def;
2526         u64 step;
2527         u32 flags;
2528
2529         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2530
2531         if (type == V4L2_CTRL_TYPE_MENU)
2532                 qmenu = v4l2_ctrl_get_menu(id);
2533         else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2534                 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2535
2536         if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2537                 handler_set_err(hdl, -EINVAL);
2538                 return NULL;
2539         }
2540         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2541                              0, max, mask, def, NULL, 0,
2542                              flags, qmenu, qmenu_int, NULL);
2543 }
2544 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2545
2546 /* Helper function for standard menu controls with driver defined menu */
2547 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2548                         const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2549                         u64 mask, u8 _def, const char * const *qmenu)
2550 {
2551         enum v4l2_ctrl_type type;
2552         const char *name;
2553         u32 flags;
2554         u64 step;
2555         s64 min;
2556         s64 max = _max;
2557         s64 def = _def;
2558
2559         /* v4l2_ctrl_new_std_menu_items() should only be called for
2560          * standard controls without a standard menu.
2561          */
2562         if (v4l2_ctrl_get_menu(id)) {
2563                 handler_set_err(hdl, -EINVAL);
2564                 return NULL;
2565         }
2566
2567         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2568         if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2569                 handler_set_err(hdl, -EINVAL);
2570                 return NULL;
2571         }
2572         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2573                              0, max, mask, def, NULL, 0,
2574                              flags, qmenu, NULL, NULL);
2575
2576 }
2577 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2578
2579 /* Helper function for standard integer menu controls */
2580 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2581                         const struct v4l2_ctrl_ops *ops,
2582                         u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2583 {
2584         const char *name;
2585         enum v4l2_ctrl_type type;
2586         s64 min;
2587         u64 step;
2588         s64 max = _max;
2589         s64 def = _def;
2590         u32 flags;
2591
2592         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2593         if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2594                 handler_set_err(hdl, -EINVAL);
2595                 return NULL;
2596         }
2597         return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2598                              0, max, 0, def, NULL, 0,
2599                              flags, NULL, qmenu_int, NULL);
2600 }
2601 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2602
2603 /* Add the controls from another handler to our own. */
2604 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2605                           struct v4l2_ctrl_handler *add,
2606                           bool (*filter)(const struct v4l2_ctrl *ctrl),
2607                           bool from_other_dev)
2608 {
2609         struct v4l2_ctrl_ref *ref;
2610         int ret = 0;
2611
2612         /* Do nothing if either handler is NULL or if they are the same */
2613         if (!hdl || !add || hdl == add)
2614                 return 0;
2615         if (hdl->error)
2616                 return hdl->error;
2617         mutex_lock(add->lock);
2618         list_for_each_entry(ref, &add->ctrl_refs, node) {
2619                 struct v4l2_ctrl *ctrl = ref->ctrl;
2620
2621                 /* Skip handler-private controls. */
2622                 if (ctrl->is_private)
2623                         continue;
2624                 /* And control classes */
2625                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2626                         continue;
2627                 /* Filter any unwanted controls */
2628                 if (filter && !filter(ctrl))
2629                         continue;
2630                 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2631                 if (ret)
2632                         break;
2633         }
2634         mutex_unlock(add->lock);
2635         return ret;
2636 }
2637 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2638
2639 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2640 {
2641         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2642                 return true;
2643         if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2644                 return true;
2645         switch (ctrl->id) {
2646         case V4L2_CID_AUDIO_MUTE:
2647         case V4L2_CID_AUDIO_VOLUME:
2648         case V4L2_CID_AUDIO_BALANCE:
2649         case V4L2_CID_AUDIO_BASS:
2650         case V4L2_CID_AUDIO_TREBLE:
2651         case V4L2_CID_AUDIO_LOUDNESS:
2652                 return true;
2653         default:
2654                 break;
2655         }
2656         return false;
2657 }
2658 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2659
2660 /* Cluster controls */
2661 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2662 {
2663         bool has_volatiles = false;
2664         int i;
2665
2666         /* The first control is the master control and it must not be NULL */
2667         if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2668                 return;
2669
2670         for (i = 0; i < ncontrols; i++) {
2671                 if (controls[i]) {
2672                         controls[i]->cluster = controls;
2673                         controls[i]->ncontrols = ncontrols;
2674                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2675                                 has_volatiles = true;
2676                 }
2677         }
2678         controls[0]->has_volatiles = has_volatiles;
2679 }
2680 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2681
2682 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2683                             u8 manual_val, bool set_volatile)
2684 {
2685         struct v4l2_ctrl *master = controls[0];
2686         u32 flag = 0;
2687         int i;
2688
2689         v4l2_ctrl_cluster(ncontrols, controls);
2690         WARN_ON(ncontrols <= 1);
2691         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2692         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2693         master->is_auto = true;
2694         master->has_volatiles = set_volatile;
2695         master->manual_mode_value = manual_val;
2696         master->flags |= V4L2_CTRL_FLAG_UPDATE;
2697
2698         if (!is_cur_manual(master))
2699                 flag = V4L2_CTRL_FLAG_INACTIVE |
2700                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2701
2702         for (i = 1; i < ncontrols; i++)
2703                 if (controls[i])
2704                         controls[i]->flags |= flag;
2705 }
2706 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2707
2708 /* Activate/deactivate a control. */
2709 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2710 {
2711         /* invert since the actual flag is called 'inactive' */
2712         bool inactive = !active;
2713         bool old;
2714
2715         if (ctrl == NULL)
2716                 return;
2717
2718         if (inactive)
2719                 /* set V4L2_CTRL_FLAG_INACTIVE */
2720                 old = test_and_set_bit(4, &ctrl->flags);
2721         else
2722                 /* clear V4L2_CTRL_FLAG_INACTIVE */
2723                 old = test_and_clear_bit(4, &ctrl->flags);
2724         if (old != inactive)
2725                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2726 }
2727 EXPORT_SYMBOL(v4l2_ctrl_activate);
2728
2729 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2730 {
2731         bool old;
2732
2733         if (ctrl == NULL)
2734                 return;
2735
2736         lockdep_assert_held(ctrl->handler->lock);
2737
2738         if (grabbed)
2739                 /* set V4L2_CTRL_FLAG_GRABBED */
2740                 old = test_and_set_bit(1, &ctrl->flags);
2741         else
2742                 /* clear V4L2_CTRL_FLAG_GRABBED */
2743                 old = test_and_clear_bit(1, &ctrl->flags);
2744         if (old != grabbed)
2745                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2746 }
2747 EXPORT_SYMBOL(__v4l2_ctrl_grab);
2748
2749 /* Log the control name and value */
2750 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2751                      const char *prefix, const char *colon)
2752 {
2753         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2754                 return;
2755         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2756                 return;
2757
2758         pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2759
2760         ctrl->type_ops->log(ctrl);
2761
2762         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2763                            V4L2_CTRL_FLAG_GRABBED |
2764                            V4L2_CTRL_FLAG_VOLATILE)) {
2765                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2766                         pr_cont(" inactive");
2767                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2768                         pr_cont(" grabbed");
2769                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2770                         pr_cont(" volatile");
2771         }
2772         pr_cont("\n");
2773 }
2774
2775 /* Log all controls owned by the handler */
2776 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2777                                   const char *prefix)
2778 {
2779         struct v4l2_ctrl *ctrl;
2780         const char *colon = "";
2781         int len;
2782
2783         if (hdl == NULL)
2784                 return;
2785         if (prefix == NULL)
2786                 prefix = "";
2787         len = strlen(prefix);
2788         if (len && prefix[len - 1] != ' ')
2789                 colon = ": ";
2790         mutex_lock(hdl->lock);
2791         list_for_each_entry(ctrl, &hdl->ctrls, node)
2792                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2793                         log_ctrl(ctrl, prefix, colon);
2794         mutex_unlock(hdl->lock);
2795 }
2796 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2797
2798 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2799 {
2800         v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2801         return 0;
2802 }
2803 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2804
2805 /* Call s_ctrl for all controls owned by the handler */
2806 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2807 {
2808         struct v4l2_ctrl *ctrl;
2809         int ret = 0;
2810
2811         if (hdl == NULL)
2812                 return 0;
2813
2814         lockdep_assert_held(hdl->lock);
2815
2816         list_for_each_entry(ctrl, &hdl->ctrls, node)
2817                 ctrl->done = false;
2818
2819         list_for_each_entry(ctrl, &hdl->ctrls, node) {
2820                 struct v4l2_ctrl *master = ctrl->cluster[0];
2821                 int i;
2822
2823                 /* Skip if this control was already handled by a cluster. */
2824                 /* Skip button controls and read-only controls. */
2825                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2826                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2827                         continue;
2828
2829                 for (i = 0; i < master->ncontrols; i++) {
2830                         if (master->cluster[i]) {
2831                                 cur_to_new(master->cluster[i]);
2832                                 master->cluster[i]->is_new = 1;
2833                                 master->cluster[i]->done = true;
2834                         }
2835                 }
2836                 ret = call_op(master, s_ctrl);
2837                 if (ret)
2838                         break;
2839         }
2840
2841         return ret;
2842 }
2843 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2844
2845 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2846 {
2847         int ret;
2848
2849         if (hdl == NULL)
2850                 return 0;
2851
2852         mutex_lock(hdl->lock);
2853         ret = __v4l2_ctrl_handler_setup(hdl);
2854         mutex_unlock(hdl->lock);
2855
2856         return ret;
2857 }
2858 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2859
2860 /* Implement VIDIOC_QUERY_EXT_CTRL */
2861 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2862 {
2863         const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2864         u32 id = qc->id & V4L2_CTRL_ID_MASK;
2865         struct v4l2_ctrl_ref *ref;
2866         struct v4l2_ctrl *ctrl;
2867
2868         if (hdl == NULL)
2869                 return -EINVAL;
2870
2871         mutex_lock(hdl->lock);
2872
2873         /* Try to find it */
2874         ref = find_ref(hdl, id);
2875
2876         if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2877                 bool is_compound;
2878                 /* Match any control that is not hidden */
2879                 unsigned mask = 1;
2880                 bool match = false;
2881
2882                 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2883                         /* Match any hidden control */
2884                         match = true;
2885                 } else if ((qc->id & next_flags) == next_flags) {
2886                         /* Match any control, compound or not */
2887                         mask = 0;
2888                 }
2889
2890                 /* Find the next control with ID > qc->id */
2891
2892                 /* Did we reach the end of the control list? */
2893                 if (id >= node2id(hdl->ctrl_refs.prev)) {
2894                         ref = NULL; /* Yes, so there is no next control */
2895                 } else if (ref) {
2896                         /* We found a control with the given ID, so just get
2897                            the next valid one in the list. */
2898                         list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2899                                 is_compound = ref->ctrl->is_array ||
2900                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2901                                 if (id < ref->ctrl->id &&
2902                                     (is_compound & mask) == match)
2903                                         break;
2904                         }
2905                         if (&ref->node == &hdl->ctrl_refs)
2906                                 ref = NULL;
2907                 } else {
2908                         /* No control with the given ID exists, so start
2909                            searching for the next largest ID. We know there
2910                            is one, otherwise the first 'if' above would have
2911                            been true. */
2912                         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2913                                 is_compound = ref->ctrl->is_array ||
2914                                         ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2915                                 if (id < ref->ctrl->id &&
2916                                     (is_compound & mask) == match)
2917                                         break;
2918                         }
2919                         if (&ref->node == &hdl->ctrl_refs)
2920                                 ref = NULL;
2921                 }
2922         }
2923         mutex_unlock(hdl->lock);
2924
2925         if (!ref)
2926                 return -EINVAL;
2927
2928         ctrl = ref->ctrl;
2929         memset(qc, 0, sizeof(*qc));
2930         if (id >= V4L2_CID_PRIVATE_BASE)
2931                 qc->id = id;
2932         else
2933                 qc->id = ctrl->id;
2934         strscpy(qc->name, ctrl->name, sizeof(qc->name));
2935         qc->flags = user_flags(ctrl);
2936         qc->type = ctrl->type;
2937         qc->elem_size = ctrl->elem_size;
2938         qc->elems = ctrl->elems;
2939         qc->nr_of_dims = ctrl->nr_of_dims;
2940         memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2941         qc->minimum = ctrl->minimum;
2942         qc->maximum = ctrl->maximum;
2943         qc->default_value = ctrl->default_value;
2944         if (ctrl->type == V4L2_CTRL_TYPE_MENU
2945             || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2946                 qc->step = 1;
2947         else
2948                 qc->step = ctrl->step;
2949         return 0;
2950 }
2951 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2952
2953 /* Implement VIDIOC_QUERYCTRL */
2954 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2955 {
2956         struct v4l2_query_ext_ctrl qec = { qc->id };
2957         int rc;
2958
2959         rc = v4l2_query_ext_ctrl(hdl, &qec);
2960         if (rc)
2961                 return rc;
2962
2963         qc->id = qec.id;
2964         qc->type = qec.type;
2965         qc->flags = qec.flags;
2966         strscpy(qc->name, qec.name, sizeof(qc->name));
2967         switch (qc->type) {
2968         case V4L2_CTRL_TYPE_INTEGER:
2969         case V4L2_CTRL_TYPE_BOOLEAN:
2970         case V4L2_CTRL_TYPE_MENU:
2971         case V4L2_CTRL_TYPE_INTEGER_MENU:
2972         case V4L2_CTRL_TYPE_STRING:
2973         case V4L2_CTRL_TYPE_BITMASK:
2974                 qc->minimum = qec.minimum;
2975                 qc->maximum = qec.maximum;
2976                 qc->step = qec.step;
2977                 qc->default_value = qec.default_value;
2978                 break;
2979         default:
2980                 qc->minimum = 0;
2981                 qc->maximum = 0;
2982                 qc->step = 0;
2983                 qc->default_value = 0;
2984                 break;
2985         }
2986         return 0;
2987 }
2988 EXPORT_SYMBOL(v4l2_queryctrl);
2989
2990 /* Implement VIDIOC_QUERYMENU */
2991 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2992 {
2993         struct v4l2_ctrl *ctrl;
2994         u32 i = qm->index;
2995
2996         ctrl = v4l2_ctrl_find(hdl, qm->id);
2997         if (!ctrl)
2998                 return -EINVAL;
2999
3000         qm->reserved = 0;
3001         /* Sanity checks */
3002         switch (ctrl->type) {
3003         case V4L2_CTRL_TYPE_MENU:
3004                 if (ctrl->qmenu == NULL)
3005                         return -EINVAL;
3006                 break;
3007         case V4L2_CTRL_TYPE_INTEGER_MENU:
3008                 if (ctrl->qmenu_int == NULL)
3009                         return -EINVAL;
3010                 break;
3011         default:
3012                 return -EINVAL;
3013         }
3014
3015         if (i < ctrl->minimum || i > ctrl->maximum)
3016                 return -EINVAL;
3017
3018         /* Use mask to see if this menu item should be skipped */
3019         if (ctrl->menu_skip_mask & (1ULL << i))
3020                 return -EINVAL;
3021         /* Empty menu items should also be skipped */
3022         if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
3023                 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
3024                         return -EINVAL;
3025                 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
3026         } else {
3027                 qm->value = ctrl->qmenu_int[i];
3028         }
3029         return 0;
3030 }
3031 EXPORT_SYMBOL(v4l2_querymenu);
3032
3033 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
3034                                    const struct v4l2_ctrl_handler *from)
3035 {
3036         struct v4l2_ctrl_ref *ref;
3037         int err = 0;
3038
3039         if (WARN_ON(!hdl || hdl == from))
3040                 return -EINVAL;
3041
3042         if (hdl->error)
3043                 return hdl->error;
3044
3045         WARN_ON(hdl->lock != &hdl->_lock);
3046
3047         mutex_lock(from->lock);
3048         list_for_each_entry(ref, &from->ctrl_refs, node) {
3049                 struct v4l2_ctrl *ctrl = ref->ctrl;
3050                 struct v4l2_ctrl_ref *new_ref;
3051
3052                 /* Skip refs inherited from other devices */
3053                 if (ref->from_other_dev)
3054                         continue;
3055                 /* And buttons */
3056                 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
3057                         continue;
3058                 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
3059                 if (err)
3060                         break;
3061         }
3062         mutex_unlock(from->lock);
3063         return err;
3064 }
3065
3066 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
3067 {
3068         struct v4l2_ctrl_handler *hdl =
3069                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3070         struct v4l2_ctrl_handler *main_hdl = obj->priv;
3071         struct v4l2_ctrl_handler *prev_hdl = NULL;
3072         struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
3073
3074         if (list_empty(&main_hdl->requests_queued))
3075                 goto queue;
3076
3077         prev_hdl = list_last_entry(&main_hdl->requests_queued,
3078                                    struct v4l2_ctrl_handler, requests_queued);
3079         /*
3080          * Note: prev_hdl and hdl must contain the same list of control
3081          * references, so if any differences are detected then that is a
3082          * driver bug and the WARN_ON is triggered.
3083          */
3084         mutex_lock(prev_hdl->lock);
3085         ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
3086                                          struct v4l2_ctrl_ref, node);
3087         list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
3088                 if (ref_ctrl->req)
3089                         continue;
3090                 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
3091                         /* Should never happen, but just in case... */
3092                         if (list_is_last(&ref_ctrl_prev->node,
3093                                          &prev_hdl->ctrl_refs))
3094                                 break;
3095                         ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3096                 }
3097                 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3098                         break;
3099                 ref_ctrl->req = ref_ctrl_prev->req;
3100         }
3101         mutex_unlock(prev_hdl->lock);
3102 queue:
3103         list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3104         hdl->request_is_queued = true;
3105 }
3106
3107 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3108 {
3109         struct v4l2_ctrl_handler *hdl =
3110                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3111
3112         list_del_init(&hdl->requests);
3113         if (hdl->request_is_queued) {
3114                 list_del_init(&hdl->requests_queued);
3115                 hdl->request_is_queued = false;
3116         }
3117 }
3118
3119 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3120 {
3121         struct v4l2_ctrl_handler *hdl =
3122                 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3123
3124         v4l2_ctrl_handler_free(hdl);
3125         kfree(hdl);
3126 }
3127
3128 static const struct media_request_object_ops req_ops = {
3129         .queue = v4l2_ctrl_request_queue,
3130         .unbind = v4l2_ctrl_request_unbind,
3131         .release = v4l2_ctrl_request_release,
3132 };
3133
3134 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3135                                         struct v4l2_ctrl_handler *parent)
3136 {
3137         struct media_request_object *obj;
3138
3139         if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3140                     req->state != MEDIA_REQUEST_STATE_QUEUED))
3141                 return NULL;
3142
3143         obj = media_request_object_find(req, &req_ops, parent);
3144         if (obj)
3145                 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3146         return NULL;
3147 }
3148 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3149
3150 struct v4l2_ctrl *
3151 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3152 {
3153         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3154
3155         return (ref && ref->req == ref) ? ref->ctrl : NULL;
3156 }
3157 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3158
3159 static int v4l2_ctrl_request_bind(struct media_request *req,
3160                            struct v4l2_ctrl_handler *hdl,
3161                            struct v4l2_ctrl_handler *from)
3162 {
3163         int ret;
3164
3165         ret = v4l2_ctrl_request_clone(hdl, from);
3166
3167         if (!ret) {
3168                 ret = media_request_object_bind(req, &req_ops,
3169                                                 from, false, &hdl->req_obj);
3170                 if (!ret)
3171                         list_add_tail(&hdl->requests, &from->requests);
3172         }
3173         return ret;
3174 }
3175
3176 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3177
3178    It is not a fully atomic operation, just best-effort only. After all, if
3179    multiple controls have to be set through multiple i2c writes (for example)
3180    then some initial writes may succeed while others fail. Thus leaving the
3181    system in an inconsistent state. The question is how much effort you are
3182    willing to spend on trying to make something atomic that really isn't.
3183
3184    From the point of view of an application the main requirement is that
3185    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3186    error should be returned without actually affecting any controls.
3187
3188    If all the values are correct, then it is acceptable to just give up
3189    in case of low-level errors.
3190
3191    It is important though that the application can tell when only a partial
3192    configuration was done. The way we do that is through the error_idx field
3193    of struct v4l2_ext_controls: if that is equal to the count field then no
3194    controls were affected. Otherwise all controls before that index were
3195    successful in performing their 'get' or 'set' operation, the control at
3196    the given index failed, and you don't know what happened with the controls
3197    after the failed one. Since if they were part of a control cluster they
3198    could have been successfully processed (if a cluster member was encountered
3199    at index < error_idx), they could have failed (if a cluster member was at
3200    error_idx), or they may not have been processed yet (if the first cluster
3201    member appeared after error_idx).
3202
3203    It is all fairly theoretical, though. In practice all you can do is to
3204    bail out. If error_idx == count, then it is an application bug. If
3205    error_idx < count then it is only an application bug if the error code was
3206    EBUSY. That usually means that something started streaming just when you
3207    tried to set the controls. In all other cases it is a driver/hardware
3208    problem and all you can do is to retry or bail out.
3209
3210    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3211    never modifies controls the error_idx is just set to whatever control
3212    has an invalid value.
3213  */
3214
3215 /* Prepare for the extended g/s/try functions.
3216    Find the controls in the control array and do some basic checks. */
3217 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3218                              struct v4l2_ext_controls *cs,
3219                              struct v4l2_ctrl_helper *helpers,
3220                              bool get)
3221 {
3222         struct v4l2_ctrl_helper *h;
3223         bool have_clusters = false;
3224         u32 i;
3225
3226         for (i = 0, h = helpers; i < cs->count; i++, h++) {
3227                 struct v4l2_ext_control *c = &cs->controls[i];
3228                 struct v4l2_ctrl_ref *ref;
3229                 struct v4l2_ctrl *ctrl;
3230                 u32 id = c->id & V4L2_CTRL_ID_MASK;
3231
3232                 cs->error_idx = i;
3233
3234                 if (cs->which &&
3235                     cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3236                     cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3237                     V4L2_CTRL_ID2WHICH(id) != cs->which)
3238                         return -EINVAL;
3239
3240                 /* Old-style private controls are not allowed for
3241                    extended controls */
3242                 if (id >= V4L2_CID_PRIVATE_BASE)
3243                         return -EINVAL;
3244                 ref = find_ref_lock(hdl, id);
3245                 if (ref == NULL)
3246                         return -EINVAL;
3247                 h->ref = ref;
3248                 ctrl = ref->ctrl;
3249                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
3250                         return -EINVAL;
3251
3252                 if (ctrl->cluster[0]->ncontrols > 1)
3253                         have_clusters = true;
3254                 if (ctrl->cluster[0] != ctrl)
3255                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3256                 if (ctrl->is_ptr && !ctrl->is_string) {
3257                         unsigned tot_size = ctrl->elems * ctrl->elem_size;
3258
3259                         if (c->size < tot_size) {
3260                                 if (get) {
3261                                         c->size = tot_size;
3262                                         return -ENOSPC;
3263                                 }
3264                                 return -EFAULT;
3265                         }
3266                         c->size = tot_size;
3267                 }
3268                 /* Store the ref to the master control of the cluster */
3269                 h->mref = ref;
3270                 /* Initially set next to 0, meaning that there is no other
3271                    control in this helper array belonging to the same
3272                    cluster */
3273                 h->next = 0;
3274         }
3275
3276         /* We are done if there were no controls that belong to a multi-
3277            control cluster. */
3278         if (!have_clusters)
3279                 return 0;
3280
3281         /* The code below figures out in O(n) time which controls in the list
3282            belong to the same cluster. */
3283
3284         /* This has to be done with the handler lock taken. */
3285         mutex_lock(hdl->lock);
3286
3287         /* First zero the helper field in the master control references */
3288         for (i = 0; i < cs->count; i++)
3289                 helpers[i].mref->helper = NULL;
3290         for (i = 0, h = helpers; i < cs->count; i++, h++) {
3291                 struct v4l2_ctrl_ref *mref = h->mref;
3292
3293                 /* If the mref->helper is set, then it points to an earlier
3294                    helper that belongs to the same cluster. */
3295                 if (mref->helper) {
3296                         /* Set the next field of mref->helper to the current
3297                            index: this means that that earlier helper now
3298                            points to the next helper in the same cluster. */
3299                         mref->helper->next = i;
3300                         /* mref should be set only for the first helper in the
3301                            cluster, clear the others. */
3302                         h->mref = NULL;
3303                 }
3304                 /* Point the mref helper to the current helper struct. */
3305                 mref->helper = h;
3306         }
3307         mutex_unlock(hdl->lock);
3308         return 0;
3309 }
3310
3311 /* Handles the corner case where cs->count == 0. It checks whether the
3312    specified control class exists. If that class ID is 0, then it checks
3313    whether there are any controls at all. */
3314 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3315 {
3316         if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3317             which == V4L2_CTRL_WHICH_REQUEST_VAL)
3318                 return 0;
3319         return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3320 }
3321
3322 /* Get extended controls. Allocates the helpers array if needed. */
3323 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3324                                    struct v4l2_ext_controls *cs)
3325 {
3326         struct v4l2_ctrl_helper helper[4];
3327         struct v4l2_ctrl_helper *helpers = helper;
3328         int ret;
3329         int i, j;
3330         bool def_value;
3331
3332         def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3333
3334         cs->error_idx = cs->count;
3335         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3336
3337         if (hdl == NULL)
3338                 return -EINVAL;
3339
3340         if (cs->count == 0)
3341                 return class_check(hdl, cs->which);
3342
3343         if (cs->count > ARRAY_SIZE(helper)) {
3344                 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3345                                          GFP_KERNEL);
3346                 if (helpers == NULL)
3347                         return -ENOMEM;
3348         }
3349
3350         ret = prepare_ext_ctrls(hdl, cs, helpers, true);
3351         cs->error_idx = cs->count;
3352
3353         for (i = 0; !ret && i < cs->count; i++)
3354                 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3355                         ret = -EACCES;
3356
3357         for (i = 0; !ret && i < cs->count; i++) {
3358                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3359                                     struct v4l2_ctrl *ctrl);
3360                 struct v4l2_ctrl *master;
3361
3362                 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3363
3364                 if (helpers[i].mref == NULL)
3365                         continue;
3366
3367                 master = helpers[i].mref->ctrl;
3368                 cs->error_idx = i;
3369
3370                 v4l2_ctrl_lock(master);
3371
3372                 /* g_volatile_ctrl will update the new control values */
3373                 if (!def_value &&
3374                     ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3375                     (master->has_volatiles && !is_cur_manual(master)))) {
3376                         for (j = 0; j < master->ncontrols; j++)
3377                                 cur_to_new(master->cluster[j]);
3378                         ret = call_op(master, g_volatile_ctrl);
3379                         ctrl_to_user = new_to_user;
3380                 }
3381                 /* If OK, then copy the current (for non-volatile controls)
3382                    or the new (for volatile controls) control values to the
3383                    caller */
3384                 if (!ret) {
3385                         u32 idx = i;
3386
3387                         do {
3388                                 if (helpers[idx].ref->req)
3389                                         ret = req_to_user(cs->controls + idx,
3390                                                 helpers[idx].ref->req);
3391                                 else
3392                                         ret = ctrl_to_user(cs->controls + idx,
3393                                                 helpers[idx].ref->ctrl);
3394                                 idx = helpers[idx].next;
3395                         } while (!ret && idx);
3396                 }
3397                 v4l2_ctrl_unlock(master);
3398         }
3399
3400         if (cs->count > ARRAY_SIZE(helper))
3401                 kvfree(helpers);
3402         return ret;
3403 }
3404
3405 static struct media_request_object *
3406 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3407                         struct media_request *req, bool set)
3408 {
3409         struct media_request_object *obj;
3410         struct v4l2_ctrl_handler *new_hdl;
3411         int ret;
3412
3413         if (IS_ERR(req))
3414                 return ERR_CAST(req);
3415
3416         if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3417                 return ERR_PTR(-EBUSY);
3418
3419         obj = media_request_object_find(req, &req_ops, hdl);
3420         if (obj)
3421                 return obj;
3422         if (!set)
3423                 return ERR_PTR(-ENOENT);
3424
3425         new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3426         if (!new_hdl)
3427                 return ERR_PTR(-ENOMEM);
3428
3429         obj = &new_hdl->req_obj;
3430         ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3431         if (!ret)
3432                 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3433         if (ret) {
3434                 kfree(new_hdl);
3435
3436                 return ERR_PTR(ret);
3437         }
3438
3439         media_request_object_get(obj);
3440         return obj;
3441 }
3442
3443 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3444                      struct v4l2_ext_controls *cs)
3445 {
3446         struct media_request_object *obj = NULL;
3447         struct media_request *req = NULL;
3448         int ret;
3449
3450         if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3451                 if (!mdev || cs->request_fd < 0)
3452                         return -EINVAL;
3453
3454                 req = media_request_get_by_fd(mdev, cs->request_fd);
3455                 if (IS_ERR(req))
3456                         return PTR_ERR(req);
3457
3458                 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3459                         media_request_put(req);
3460                         return -EACCES;
3461                 }
3462
3463                 ret = media_request_lock_for_access(req);
3464                 if (ret) {
3465                         media_request_put(req);
3466                         return ret;
3467                 }
3468
3469                 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3470                 if (IS_ERR(obj)) {
3471                         media_request_unlock_for_access(req);
3472                         media_request_put(req);
3473                         return PTR_ERR(obj);
3474                 }
3475
3476                 hdl = container_of(obj, struct v4l2_ctrl_handler,
3477                                    req_obj);
3478         }
3479
3480         ret = v4l2_g_ext_ctrls_common(hdl, cs);
3481
3482         if (obj) {
3483                 media_request_unlock_for_access(req);
3484                 media_request_object_put(obj);
3485                 media_request_put(req);
3486         }
3487         return ret;
3488 }
3489 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3490
3491 /* Helper function to get a single control */
3492 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3493 {
3494         struct v4l2_ctrl *master = ctrl->cluster[0];
3495         int ret = 0;
3496         int i;
3497
3498         /* Compound controls are not supported. The new_to_user() and
3499          * cur_to_user() calls below would need to be modified not to access
3500          * userspace memory when called from get_ctrl().
3501          */
3502         if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3503                 return -EINVAL;
3504
3505         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3506                 return -EACCES;
3507
3508         v4l2_ctrl_lock(master);
3509         /* g_volatile_ctrl will update the current control values */
3510         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3511                 for (i = 0; i < master->ncontrols; i++)
3512                         cur_to_new(master->cluster[i]);
3513                 ret = call_op(master, g_volatile_ctrl);
3514                 new_to_user(c, ctrl);
3515         } else {
3516                 cur_to_user(c, ctrl);
3517         }
3518         v4l2_ctrl_unlock(master);
3519         return ret;
3520 }
3521
3522 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3523 {
3524         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3525         struct v4l2_ext_control c;
3526         int ret;
3527
3528         if (ctrl == NULL || !ctrl->is_int)
3529                 return -EINVAL;
3530         ret = get_ctrl(ctrl, &c);
3531         control->value = c.value;
3532         return ret;
3533 }
3534 EXPORT_SYMBOL(v4l2_g_ctrl);
3535
3536 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3537 {
3538         struct v4l2_ext_control c;
3539
3540         /* It's a driver bug if this happens. */
3541         WARN_ON(!ctrl->is_int);
3542         c.value = 0;
3543         get_ctrl(ctrl, &c);
3544         return c.value;
3545 }
3546 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3547
3548 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3549 {
3550         struct v4l2_ext_control c;
3551
3552         /* It's a driver bug if this happens. */
3553         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3554         c.value64 = 0;
3555         get_ctrl(ctrl, &c);
3556         return c.value64;
3557 }
3558 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3559
3560
3561 /* Core function that calls try/s_ctrl and ensures that the new value is
3562    copied to the current value on a set.
3563    Must be called with ctrl->handler->lock held. */
3564 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3565                               bool set, u32 ch_flags)
3566 {
3567         bool update_flag;
3568         int ret;
3569         int i;
3570
3571         /* Go through the cluster and either validate the new value or
3572            (if no new value was set), copy the current value to the new
3573            value, ensuring a consistent view for the control ops when
3574            called. */
3575         for (i = 0; i < master->ncontrols; i++) {
3576                 struct v4l2_ctrl *ctrl = master->cluster[i];
3577
3578                 if (ctrl == NULL)
3579                         continue;
3580
3581                 if (!ctrl->is_new) {
3582                         cur_to_new(ctrl);
3583                         continue;
3584                 }
3585                 /* Check again: it may have changed since the
3586                    previous check in try_or_set_ext_ctrls(). */
3587                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3588                         return -EBUSY;
3589         }
3590
3591         ret = call_op(master, try_ctrl);
3592
3593         /* Don't set if there is no change */
3594         if (ret || !set || !cluster_changed(master))
3595                 return ret;
3596         ret = call_op(master, s_ctrl);
3597         if (ret)
3598                 return ret;
3599
3600         /* If OK, then make the new values permanent. */
3601         update_flag = is_cur_manual(master) != is_new_manual(master);
3602
3603         for (i = 0; i < master->ncontrols; i++) {
3604                 /*
3605                  * If we switch from auto to manual mode, and this cluster
3606                  * contains volatile controls, then all non-master controls
3607                  * have to be marked as changed. The 'new' value contains
3608                  * the volatile value (obtained by update_from_auto_cluster),
3609                  * which now has to become the current value.
3610                  */
3611                 if (i && update_flag && is_new_manual(master) &&
3612                     master->has_volatiles && master->cluster[i])
3613                         master->cluster[i]->has_changed = true;
3614
3615                 new_to_cur(fh, master->cluster[i], ch_flags |
3616                         ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3617         }
3618         return 0;
3619 }
3620
3621 /* Validate controls. */
3622 static int validate_ctrls(struct v4l2_ext_controls *cs,
3623                           struct v4l2_ctrl_helper *helpers, bool set)
3624 {
3625         unsigned i;
3626         int ret = 0;
3627
3628         cs->error_idx = cs->count;
3629         for (i = 0; i < cs->count; i++) {
3630                 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3631                 union v4l2_ctrl_ptr p_new;
3632
3633                 cs->error_idx = i;
3634
3635                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3636                         return -EACCES;
3637                 /* This test is also done in try_set_control_cluster() which
3638                    is called in atomic context, so that has the final say,
3639                    but it makes sense to do an up-front check as well. Once
3640                    an error occurs in try_set_control_cluster() some other
3641                    controls may have been set already and we want to do a
3642                    best-effort to avoid that. */
3643                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3644                         return -EBUSY;
3645                 /*
3646                  * Skip validation for now if the payload needs to be copied
3647                  * from userspace into kernelspace. We'll validate those later.
3648                  */
3649                 if (ctrl->is_ptr)
3650                         continue;
3651                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3652                         p_new.p_s64 = &cs->controls[i].value64;
3653                 else
3654                         p_new.p_s32 = &cs->controls[i].value;
3655                 ret = validate_new(ctrl, p_new);
3656                 if (ret)
3657                         return ret;
3658         }
3659         return 0;
3660 }
3661
3662 /* Obtain the current volatile values of an autocluster and mark them
3663    as new. */
3664 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3665 {
3666         int i;
3667
3668         for (i = 1; i < master->ncontrols; i++)
3669                 cur_to_new(master->cluster[i]);
3670         if (!call_op(master, g_volatile_ctrl))
3671                 for (i = 1; i < master->ncontrols; i++)
3672                         if (master->cluster[i])
3673                                 master->cluster[i]->is_new = 1;
3674 }
3675
3676 /* Try or try-and-set controls */
3677 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
3678                                     struct v4l2_ctrl_handler *hdl,
3679                                     struct v4l2_ext_controls *cs, bool set)
3680 {
3681         struct v4l2_ctrl_helper helper[4];
3682         struct v4l2_ctrl_helper *helpers = helper;
3683         unsigned i, j;
3684         int ret;
3685
3686         cs->error_idx = cs->count;
3687
3688         /* Default value cannot be changed */
3689         if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3690                 return -EINVAL;
3691
3692         cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3693
3694         if (hdl == NULL)
3695                 return -EINVAL;
3696
3697         if (cs->count == 0)
3698                 return class_check(hdl, cs->which);
3699
3700         if (cs->count > ARRAY_SIZE(helper)) {
3701                 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3702                                          GFP_KERNEL);
3703                 if (!helpers)
3704                         return -ENOMEM;
3705         }
3706         ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3707         if (!ret)
3708                 ret = validate_ctrls(cs, helpers, set);
3709         if (ret && set)
3710                 cs->error_idx = cs->count;
3711         for (i = 0; !ret && i < cs->count; i++) {
3712                 struct v4l2_ctrl *master;
3713                 u32 idx = i;
3714
3715                 if (helpers[i].mref == NULL)
3716                         continue;
3717
3718                 cs->error_idx = i;
3719                 master = helpers[i].mref->ctrl;
3720                 v4l2_ctrl_lock(master);
3721
3722                 /* Reset the 'is_new' flags of the cluster */
3723                 for (j = 0; j < master->ncontrols; j++)
3724                         if (master->cluster[j])
3725                                 master->cluster[j]->is_new = 0;
3726
3727                 /* For volatile autoclusters that are currently in auto mode
3728                    we need to discover if it will be set to manual mode.
3729                    If so, then we have to copy the current volatile values
3730                    first since those will become the new manual values (which
3731                    may be overwritten by explicit new values from this set
3732                    of controls). */
3733                 if (master->is_auto && master->has_volatiles &&
3734                                                 !is_cur_manual(master)) {
3735                         /* Pick an initial non-manual value */
3736                         s32 new_auto_val = master->manual_mode_value + 1;
3737                         u32 tmp_idx = idx;
3738
3739                         do {
3740                                 /* Check if the auto control is part of the
3741                                    list, and remember the new value. */
3742                                 if (helpers[tmp_idx].ref->ctrl == master)
3743                                         new_auto_val = cs->controls[tmp_idx].value;
3744                                 tmp_idx = helpers[tmp_idx].next;
3745                         } while (tmp_idx);
3746                         /* If the new value == the manual value, then copy
3747                            the current volatile values. */
3748                         if (new_auto_val == master->manual_mode_value)
3749                                 update_from_auto_cluster(master);
3750                 }
3751
3752                 /* Copy the new caller-supplied control values.
3753                    user_to_new() sets 'is_new' to 1. */
3754                 do {
3755                         struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
3756
3757                         ret = user_to_new(cs->controls + idx, ctrl);
3758                         if (!ret && ctrl->is_ptr)
3759                                 ret = validate_new(ctrl, ctrl->p_new);
3760                         idx = helpers[idx].next;
3761                 } while (!ret && idx);
3762
3763                 if (!ret)
3764                         ret = try_or_set_cluster(fh, master,
3765                                                  !hdl->req_obj.req && set, 0);
3766                 if (!ret && hdl->req_obj.req && set) {
3767                         for (j = 0; j < master->ncontrols; j++) {
3768                                 struct v4l2_ctrl_ref *ref =
3769                                         find_ref(hdl, master->cluster[j]->id);
3770
3771                                 new_to_req(ref);
3772                         }
3773                 }
3774
3775                 /* Copy the new values back to userspace. */
3776                 if (!ret) {
3777                         idx = i;
3778                         do {
3779                                 ret = new_to_user(cs->controls + idx,
3780                                                 helpers[idx].ref->ctrl);
3781                                 idx = helpers[idx].next;
3782                         } while (!ret && idx);
3783                 }
3784                 v4l2_ctrl_unlock(master);
3785         }
3786
3787         if (cs->count > ARRAY_SIZE(helper))
3788                 kvfree(helpers);
3789         return ret;
3790 }
3791
3792 static int try_set_ext_ctrls(struct v4l2_fh *fh,
3793                              struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3794                              struct v4l2_ext_controls *cs, bool set)
3795 {
3796         struct media_request_object *obj = NULL;
3797         struct media_request *req = NULL;
3798         int ret;
3799
3800         if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3801                 if (!mdev || cs->request_fd < 0)
3802                         return -EINVAL;
3803
3804                 req = media_request_get_by_fd(mdev, cs->request_fd);
3805                 if (IS_ERR(req))
3806                         return PTR_ERR(req);
3807
3808                 ret = media_request_lock_for_update(req);
3809                 if (ret) {
3810                         media_request_put(req);
3811                         return ret;
3812                 }
3813
3814                 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
3815                 if (IS_ERR(obj)) {
3816                         media_request_unlock_for_update(req);
3817                         media_request_put(req);
3818                         return PTR_ERR(obj);
3819                 }
3820                 hdl = container_of(obj, struct v4l2_ctrl_handler,
3821                                    req_obj);
3822         }
3823
3824         ret = try_set_ext_ctrls_common(fh, hdl, cs, set);
3825
3826         if (obj) {
3827                 media_request_unlock_for_update(req);
3828                 media_request_object_put(obj);
3829                 media_request_put(req);
3830         }
3831
3832         return ret;
3833 }
3834
3835 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
3836                        struct v4l2_ext_controls *cs)
3837 {
3838         return try_set_ext_ctrls(NULL, hdl, mdev, cs, false);
3839 }
3840 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3841
3842 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3843                      struct media_device *mdev, struct v4l2_ext_controls *cs)
3844 {
3845         return try_set_ext_ctrls(fh, hdl, mdev, cs, true);
3846 }
3847 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3848
3849 /* Helper function for VIDIOC_S_CTRL compatibility */
3850 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3851 {
3852         struct v4l2_ctrl *master = ctrl->cluster[0];
3853         int ret;
3854         int i;
3855
3856         /* Reset the 'is_new' flags of the cluster */
3857         for (i = 0; i < master->ncontrols; i++)
3858                 if (master->cluster[i])
3859                         master->cluster[i]->is_new = 0;
3860
3861         ret = validate_new(ctrl, ctrl->p_new);
3862         if (ret)
3863                 return ret;
3864
3865         /* For autoclusters with volatiles that are switched from auto to
3866            manual mode we have to update the current volatile values since
3867            those will become the initial manual values after such a switch. */
3868         if (master->is_auto && master->has_volatiles && ctrl == master &&
3869             !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3870                 update_from_auto_cluster(master);
3871
3872         ctrl->is_new = 1;
3873         return try_or_set_cluster(fh, master, true, ch_flags);
3874 }
3875
3876 /* Helper function for VIDIOC_S_CTRL compatibility */
3877 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3878                          struct v4l2_ext_control *c)
3879 {
3880         int ret;
3881
3882         v4l2_ctrl_lock(ctrl);
3883         user_to_new(c, ctrl);
3884         ret = set_ctrl(fh, ctrl, 0);
3885         if (!ret)
3886                 cur_to_user(c, ctrl);
3887         v4l2_ctrl_unlock(ctrl);
3888         return ret;
3889 }
3890
3891 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3892                                         struct v4l2_control *control)
3893 {
3894         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3895         struct v4l2_ext_control c = { control->id };
3896         int ret;
3897
3898         if (ctrl == NULL || !ctrl->is_int)
3899                 return -EINVAL;
3900
3901         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3902                 return -EACCES;
3903
3904         c.value = control->value;
3905         ret = set_ctrl_lock(fh, ctrl, &c);
3906         control->value = c.value;
3907         return ret;
3908 }
3909 EXPORT_SYMBOL(v4l2_s_ctrl);
3910
3911 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3912 {
3913         lockdep_assert_held(ctrl->handler->lock);
3914
3915         /* It's a driver bug if this happens. */
3916         WARN_ON(!ctrl->is_int);
3917         ctrl->val = val;
3918         return set_ctrl(NULL, ctrl, 0);
3919 }
3920 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3921
3922 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3923 {
3924         lockdep_assert_held(ctrl->handler->lock);
3925
3926         /* It's a driver bug if this happens. */
3927         WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3928         *ctrl->p_new.p_s64 = val;
3929         return set_ctrl(NULL, ctrl, 0);
3930 }
3931 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3932
3933 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3934 {
3935         lockdep_assert_held(ctrl->handler->lock);
3936
3937         /* It's a driver bug if this happens. */
3938         WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3939         strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3940         return set_ctrl(NULL, ctrl, 0);
3941 }
3942 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3943
3944 void v4l2_ctrl_request_complete(struct media_request *req,
3945                                 struct v4l2_ctrl_handler *main_hdl)
3946 {
3947         struct media_request_object *obj;
3948         struct v4l2_ctrl_handler *hdl;
3949         struct v4l2_ctrl_ref *ref;
3950
3951         if (!req || !main_hdl)
3952                 return;
3953
3954         /*
3955          * Note that it is valid if nothing was found. It means
3956          * that this request doesn't have any controls and so just
3957          * wants to leave the controls unchanged.
3958          */
3959         obj = media_request_object_find(req, &req_ops, main_hdl);
3960         if (!obj)
3961                 return;
3962         hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
3963
3964         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3965                 struct v4l2_ctrl *ctrl = ref->ctrl;
3966                 struct v4l2_ctrl *master = ctrl->cluster[0];
3967                 unsigned int i;
3968
3969                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3970                         ref->req = ref;
3971
3972                         v4l2_ctrl_lock(master);
3973                         /* g_volatile_ctrl will update the current control values */
3974                         for (i = 0; i < master->ncontrols; i++)
3975                                 cur_to_new(master->cluster[i]);
3976                         call_op(master, g_volatile_ctrl);
3977                         new_to_req(ref);
3978                         v4l2_ctrl_unlock(master);
3979                         continue;
3980                 }
3981                 if (ref->req == ref)
3982                         continue;
3983
3984                 v4l2_ctrl_lock(ctrl);
3985                 if (ref->req)
3986                         ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
3987                 else
3988                         ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
3989                 v4l2_ctrl_unlock(ctrl);
3990         }
3991
3992         WARN_ON(!hdl->request_is_queued);
3993         list_del_init(&hdl->requests_queued);
3994         hdl->request_is_queued = false;
3995         media_request_object_complete(obj);
3996         media_request_object_put(obj);
3997 }
3998 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
3999
4000 int v4l2_ctrl_request_setup(struct media_request *req,
4001                              struct v4l2_ctrl_handler *main_hdl)
4002 {
4003         struct media_request_object *obj;
4004         struct v4l2_ctrl_handler *hdl;
4005         struct v4l2_ctrl_ref *ref;
4006         int ret = 0;
4007
4008         if (!req || !main_hdl)
4009                 return 0;
4010
4011         if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
4012                 return -EBUSY;
4013
4014         /*
4015          * Note that it is valid if nothing was found. It means
4016          * that this request doesn't have any controls and so just
4017          * wants to leave the controls unchanged.
4018          */
4019         obj = media_request_object_find(req, &req_ops, main_hdl);
4020         if (!obj)
4021                 return 0;
4022         if (obj->completed) {
4023                 media_request_object_put(obj);
4024                 return -EBUSY;
4025         }
4026         hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4027
4028         list_for_each_entry(ref, &hdl->ctrl_refs, node)
4029                 ref->req_done = false;
4030
4031         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4032                 struct v4l2_ctrl *ctrl = ref->ctrl;
4033                 struct v4l2_ctrl *master = ctrl->cluster[0];
4034                 bool have_new_data = false;
4035                 int i;
4036
4037                 /*
4038                  * Skip if this control was already handled by a cluster.
4039                  * Skip button controls and read-only controls.
4040                  */
4041                 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
4042                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
4043                         continue;
4044
4045                 v4l2_ctrl_lock(master);
4046                 for (i = 0; i < master->ncontrols; i++) {
4047                         if (master->cluster[i]) {
4048                                 struct v4l2_ctrl_ref *r =
4049                                         find_ref(hdl, master->cluster[i]->id);
4050
4051                                 if (r->req && r == r->req) {
4052                                         have_new_data = true;
4053                                         break;
4054                                 }
4055                         }
4056                 }
4057                 if (!have_new_data) {
4058                         v4l2_ctrl_unlock(master);
4059                         continue;
4060                 }
4061
4062                 for (i = 0; i < master->ncontrols; i++) {
4063                         if (master->cluster[i]) {
4064                                 struct v4l2_ctrl_ref *r =
4065                                         find_ref(hdl, master->cluster[i]->id);
4066
4067                                 req_to_new(r);
4068                                 master->cluster[i]->is_new = 1;
4069                                 r->req_done = true;
4070                         }
4071                 }
4072                 /*
4073                  * For volatile autoclusters that are currently in auto mode
4074                  * we need to discover if it will be set to manual mode.
4075                  * If so, then we have to copy the current volatile values
4076                  * first since those will become the new manual values (which
4077                  * may be overwritten by explicit new values from this set
4078                  * of controls).
4079                  */
4080                 if (master->is_auto && master->has_volatiles &&
4081                     !is_cur_manual(master)) {
4082                         s32 new_auto_val = *master->p_new.p_s32;
4083
4084                         /*
4085                          * If the new value == the manual value, then copy
4086                          * the current volatile values.
4087                          */
4088                         if (new_auto_val == master->manual_mode_value)
4089                                 update_from_auto_cluster(master);
4090                 }
4091
4092                 ret = try_or_set_cluster(NULL, master, true, 0);
4093                 v4l2_ctrl_unlock(master);
4094
4095                 if (ret)
4096                         break;
4097         }
4098
4099         media_request_object_put(obj);
4100         return ret;
4101 }
4102 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4103
4104 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4105 {
4106         if (ctrl == NULL)
4107                 return;
4108         if (notify == NULL) {
4109                 ctrl->call_notify = 0;
4110                 return;
4111         }
4112         if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4113                 return;
4114         ctrl->handler->notify = notify;
4115         ctrl->handler->notify_priv = priv;
4116         ctrl->call_notify = 1;
4117 }
4118 EXPORT_SYMBOL(v4l2_ctrl_notify);
4119
4120 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4121                         s64 min, s64 max, u64 step, s64 def)
4122 {
4123         bool value_changed;
4124         bool range_changed = false;
4125         int ret;
4126
4127         lockdep_assert_held(ctrl->handler->lock);
4128
4129         switch (ctrl->type) {
4130         case V4L2_CTRL_TYPE_INTEGER:
4131         case V4L2_CTRL_TYPE_INTEGER64:
4132         case V4L2_CTRL_TYPE_BOOLEAN:
4133         case V4L2_CTRL_TYPE_MENU:
4134         case V4L2_CTRL_TYPE_INTEGER_MENU:
4135         case V4L2_CTRL_TYPE_BITMASK:
4136         case V4L2_CTRL_TYPE_U8:
4137         case V4L2_CTRL_TYPE_U16:
4138         case V4L2_CTRL_TYPE_U32:
4139                 if (ctrl->is_array)
4140                         return -EINVAL;
4141                 ret = check_range(ctrl->type, min, max, step, def);
4142                 if (ret)
4143                         return ret;
4144                 break;
4145         default:
4146                 return -EINVAL;
4147         }
4148         if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4149                 (ctrl->step != step) || ctrl->default_value != def) {
4150                 range_changed = true;
4151                 ctrl->minimum = min;
4152                 ctrl->maximum = max;
4153                 ctrl->step = step;
4154                 ctrl->default_value = def;
4155         }
4156         cur_to_new(ctrl);
4157         if (validate_new(ctrl, ctrl->p_new)) {
4158                 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4159                         *ctrl->p_new.p_s64 = def;
4160                 else
4161                         *ctrl->p_new.p_s32 = def;
4162         }
4163
4164         if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4165                 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4166         else
4167                 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4168         if (value_changed)
4169                 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4170         else if (range_changed)
4171                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4172         return ret;
4173 }
4174 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4175
4176 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4177 {
4178         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4179
4180         if (ctrl == NULL)
4181                 return -EINVAL;
4182
4183         v4l2_ctrl_lock(ctrl);
4184         list_add_tail(&sev->node, &ctrl->ev_subs);
4185         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4186             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4187                 struct v4l2_event ev;
4188                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4189
4190                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4191                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
4192                 fill_event(&ev, ctrl, changes);
4193                 /* Mark the queue as active, allowing this initial
4194                    event to be accepted. */
4195                 sev->elems = elems;
4196                 v4l2_event_queue_fh(sev->fh, &ev);
4197         }
4198         v4l2_ctrl_unlock(ctrl);
4199         return 0;
4200 }
4201
4202 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4203 {
4204         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4205
4206         if (ctrl == NULL)
4207                 return;
4208
4209         v4l2_ctrl_lock(ctrl);
4210         list_del(&sev->node);
4211         v4l2_ctrl_unlock(ctrl);
4212 }
4213
4214 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4215 {
4216         u32 old_changes = old->u.ctrl.changes;
4217
4218         old->u.ctrl = new->u.ctrl;
4219         old->u.ctrl.changes |= old_changes;
4220 }
4221 EXPORT_SYMBOL(v4l2_ctrl_replace);
4222
4223 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4224 {
4225         new->u.ctrl.changes |= old->u.ctrl.changes;
4226 }
4227 EXPORT_SYMBOL(v4l2_ctrl_merge);
4228
4229 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4230         .add = v4l2_ctrl_add_event,
4231         .del = v4l2_ctrl_del_event,
4232         .replace = v4l2_ctrl_replace,
4233         .merge = v4l2_ctrl_merge,
4234 };
4235 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4236
4237 int v4l2_ctrl_log_status(struct file *file, void *fh)
4238 {
4239         struct video_device *vfd = video_devdata(file);
4240         struct v4l2_fh *vfh = file->private_data;
4241
4242         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4243                 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4244                         vfd->v4l2_dev->name);
4245         return 0;
4246 }
4247 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4248
4249 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4250                                 const struct v4l2_event_subscription *sub)
4251 {
4252         if (sub->type == V4L2_EVENT_CTRL)
4253                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4254         return -EINVAL;
4255 }
4256 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4257
4258 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4259                                      struct v4l2_event_subscription *sub)
4260 {
4261         if (!sd->ctrl_handler)
4262                 return -EINVAL;
4263         return v4l2_ctrl_subscribe_event(fh, sub);
4264 }
4265 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4266
4267 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4268 {
4269         struct v4l2_fh *fh = file->private_data;
4270
4271         poll_wait(file, &fh->wait, wait);
4272         if (v4l2_event_pending(fh))
4273                 return EPOLLPRI;
4274         return 0;
4275 }
4276 EXPORT_SYMBOL(v4l2_ctrl_poll);