drivers/media/usb/uvc/uvc_driver.c

   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/atomic.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/wait.h>
  23 #include <linux/version.h>
  24 #include <asm/unaligned.h>
  25
  26 #include <media/v4l2-common.h>
  27
  28 #include "uvcvideo.h"
  29
  30 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  31                                 "<laurent.pinchart@ideasonboard.com>"
  32 #define DRIVER_DESC             "USB Video Class driver"
  33
  34 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  35 unsigned int uvc_hw_timestamps_param;
  36 unsigned int uvc_no_drop_param;
  37 static unsigned int uvc_quirks_param = -1;
  38 unsigned int uvc_trace_param;
  39 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  40
  41 /* ------------------------------------------------------------------------
  42  * Video formats
  43  */
  44
  45 static struct uvc_format_desc uvc_fmts[] = {
  46         {
  47                 .name           = "YUV 4:2:2 (YUYV)",
  48                 .guid           = UVC_GUID_FORMAT_YUY2,
  49                 .fcc            = V4L2_PIX_FMT_YUYV,
  50         },
  51         {
  52                 .name           = "YUV 4:2:2 (YUYV)",
  53                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  54                 .fcc            = V4L2_PIX_FMT_YUYV,
  55         },
  56         {
  57                 .name           = "YUV 4:2:0 (NV12)",
  58                 .guid           = UVC_GUID_FORMAT_NV12,
  59                 .fcc            = V4L2_PIX_FMT_NV12,
  60         },
  61         {
  62                 .name           = "MJPEG",
  63                 .guid           = UVC_GUID_FORMAT_MJPEG,
  64                 .fcc            = V4L2_PIX_FMT_MJPEG,
  65         },
  66         {
  67                 .name           = "YVU 4:2:0 (YV12)",
  68                 .guid           = UVC_GUID_FORMAT_YV12,
  69                 .fcc            = V4L2_PIX_FMT_YVU420,
  70         },
  71         {
  72                 .name           = "YUV 4:2:0 (I420)",
  73                 .guid           = UVC_GUID_FORMAT_I420,
  74                 .fcc            = V4L2_PIX_FMT_YUV420,
  75         },
  76         {
  77                 .name           = "YUV 4:2:0 (M420)",
  78                 .guid           = UVC_GUID_FORMAT_M420,
  79                 .fcc            = V4L2_PIX_FMT_M420,
  80         },
  81         {
  82                 .name           = "YUV 4:2:2 (UYVY)",
  83                 .guid           = UVC_GUID_FORMAT_UYVY,
  84                 .fcc            = V4L2_PIX_FMT_UYVY,
  85         },
  86         {
  87                 .name           = "Greyscale 8-bit (Y800)",
  88                 .guid           = UVC_GUID_FORMAT_Y800,
  89                 .fcc            = V4L2_PIX_FMT_GREY,
  90         },
  91         {
  92                 .name           = "Greyscale 8-bit (Y8  )",
  93                 .guid           = UVC_GUID_FORMAT_Y8,
  94                 .fcc            = V4L2_PIX_FMT_GREY,
  95         },
  96         {
  97                 .name           = "Greyscale 10-bit (Y10 )",
  98                 .guid           = UVC_GUID_FORMAT_Y10,
  99                 .fcc            = V4L2_PIX_FMT_Y10,
 100         },
 101         {
 102                 .name           = "Greyscale 12-bit (Y12 )",
 103                 .guid           = UVC_GUID_FORMAT_Y12,
 104                 .fcc            = V4L2_PIX_FMT_Y12,
 105         },
 106         {
 107                 .name           = "Greyscale 16-bit (Y16 )",
 108                 .guid           = UVC_GUID_FORMAT_Y16,
 109                 .fcc            = V4L2_PIX_FMT_Y16,
 110         },
 111         {
 112                 .name           = "BGGR Bayer (BY8 )",
 113                 .guid           = UVC_GUID_FORMAT_BY8,
 114                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 115         },
 116         {
 117                 .name           = "BGGR Bayer (BA81)",
 118                 .guid           = UVC_GUID_FORMAT_BA81,
 119                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 120         },
 121         {
 122                 .name           = "GBRG Bayer (GBRG)",
 123                 .guid           = UVC_GUID_FORMAT_GBRG,
 124                 .fcc            = V4L2_PIX_FMT_SGBRG8,
 125         },
 126         {
 127                 .name           = "GRBG Bayer (GRBG)",
 128                 .guid           = UVC_GUID_FORMAT_GRBG,
 129                 .fcc            = V4L2_PIX_FMT_SGRBG8,
 130         },
 131         {
 132                 .name           = "RGGB Bayer (RGGB)",
 133                 .guid           = UVC_GUID_FORMAT_RGGB,
 134                 .fcc            = V4L2_PIX_FMT_SRGGB8,
 135         },
 136         {
 137                 .name           = "RGB565",
 138                 .guid           = UVC_GUID_FORMAT_RGBP,
 139                 .fcc            = V4L2_PIX_FMT_RGB565,
 140         },
 141         {
 142                 .name           = "BGR 8:8:8 (BGR3)",
 143                 .guid           = UVC_GUID_FORMAT_BGR3,
 144                 .fcc            = V4L2_PIX_FMT_BGR24,
 145         },
 146         {
 147                 .name           = "H.264",
 148                 .guid           = UVC_GUID_FORMAT_H264,
 149                 .fcc            = V4L2_PIX_FMT_H264,
 150         },
 151         {
 152                 .name           = "Greyscale 8 L/R (Y8I)",
 153                 .guid           = UVC_GUID_FORMAT_Y8I,
 154                 .fcc            = V4L2_PIX_FMT_Y8I,
 155         },
 156         {
 157                 .name           = "Greyscale 12 L/R (Y12I)",
 158                 .guid           = UVC_GUID_FORMAT_Y12I,
 159                 .fcc            = V4L2_PIX_FMT_Y12I,
 160         },
 161         {
 162                 .name           = "Depth data 16-bit (Z16)",
 163                 .guid           = UVC_GUID_FORMAT_Z16,
 164                 .fcc            = V4L2_PIX_FMT_Z16,
 165         },
 166         {
 167                 .name           = "Bayer 10-bit (SRGGB10P)",
 168                 .guid           = UVC_GUID_FORMAT_RW10,
 169                 .fcc            = V4L2_PIX_FMT_SRGGB10P,
 170         },
 171         {
 172                 .name           = "Bayer 16-bit (SBGGR16)",
 173                 .guid           = UVC_GUID_FORMAT_BG16,
 174                 .fcc            = V4L2_PIX_FMT_SBGGR16,
 175         },
 176         {
 177                 .name           = "Bayer 16-bit (SGBRG16)",
 178                 .guid           = UVC_GUID_FORMAT_GB16,
 179                 .fcc            = V4L2_PIX_FMT_SGBRG16,
 180         },
 181         {
 182                 .name           = "Bayer 16-bit (SRGGB16)",
 183                 .guid           = UVC_GUID_FORMAT_RG16,
 184                 .fcc            = V4L2_PIX_FMT_SRGGB16,
 185         },
 186         {
 187                 .name           = "Bayer 16-bit (SGRBG16)",
 188                 .guid           = UVC_GUID_FORMAT_GR16,
 189                 .fcc            = V4L2_PIX_FMT_SGRBG16,
 190         },
 191         {
 192                 .name           = "Depth data 16-bit (Z16)",
 193                 .guid           = UVC_GUID_FORMAT_INVZ,
 194                 .fcc            = V4L2_PIX_FMT_Z16,
 195         },
 196         {
 197                 .name           = "Greyscale 10-bit (Y10 )",
 198                 .guid           = UVC_GUID_FORMAT_INVI,
 199                 .fcc            = V4L2_PIX_FMT_Y10,
 200         },
 201         {
 202                 .name           = "IR:Depth 26-bit (INZI)",
 203                 .guid           = UVC_GUID_FORMAT_INZI,
 204                 .fcc            = V4L2_PIX_FMT_INZI,
 205         },
 206 };
 207
 208 /* ------------------------------------------------------------------------
 209  * Utility functions
 210  */
 211
 212 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 213                 __u8 epaddr)
 214 {
 215         struct usb_host_endpoint *ep;
 216         unsigned int i;
 217
 218         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 219                 ep = &alts->endpoint[i];
 220                 if (ep->desc.bEndpointAddress == epaddr)
 221                         return ep;
 222         }
 223
 224         return NULL;
 225 }
 226
 227 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 228 {
 229         unsigned int len = ARRAY_SIZE(uvc_fmts);
 230         unsigned int i;
 231
 232         for (i = 0; i < len; ++i) {
 233                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 234                         return &uvc_fmts[i];
 235         }
 236
 237         return NULL;
 238 }
 239
 240 static __u32 uvc_colorspace(const __u8 primaries)
 241 {
 242         static const __u8 colorprimaries[] = {
 243                 0,
 244                 V4L2_COLORSPACE_SRGB,
 245                 V4L2_COLORSPACE_470_SYSTEM_M,
 246                 V4L2_COLORSPACE_470_SYSTEM_BG,
 247                 V4L2_COLORSPACE_SMPTE170M,
 248                 V4L2_COLORSPACE_SMPTE240M,
 249         };
 250
 251         if (primaries < ARRAY_SIZE(colorprimaries))
 252                 return colorprimaries[primaries];
 253
 254         return 0;
 255 }
 256
 257 /* Simplify a fraction using a simple continued fraction decomposition. The
 258  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 259  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 260  * arbitrary parameters to remove non-significative terms from the simple
 261  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 262  * respectively seems to give nice results.
 263  */
 264 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 265                 unsigned int n_terms, unsigned int threshold)
 266 {
 267         uint32_t *an;
 268         uint32_t x, y, r;
 269         unsigned int i, n;
 270
 271         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 272         if (an == NULL)
 273                 return;
 274
 275         /* Convert the fraction to a simple continued fraction. See
 276          * http://mathforum.org/dr.math/faq/faq.fractions.html
 277          * Stop if the current term is bigger than or equal to the given
 278          * threshold.
 279          */
 280         x = *numerator;
 281         y = *denominator;
 282
 283         for (n = 0; n < n_terms && y != 0; ++n) {
 284                 an[n] = x / y;
 285                 if (an[n] >= threshold) {
 286                         if (n < 2)
 287                                 n++;
 288                         break;
 289                 }
 290
 291                 r = x - an[n] * y;
 292                 x = y;
 293                 y = r;
 294         }
 295
 296         /* Expand the simple continued fraction back to an integer fraction. */
 297         x = 0;
 298         y = 1;
 299
 300         for (i = n; i > 0; --i) {
 301                 r = y;
 302                 y = an[i-1] * y + x;
 303                 x = r;
 304         }
 305
 306         *numerator = y;
 307         *denominator = x;
 308         kfree(an);
 309 }
 310
 311 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 312  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 313  * arithmetic only.
 314  */
 315 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 316 {
 317         uint32_t multiplier;
 318
 319         /* Saturate the result if the operation would overflow. */
 320         if (denominator == 0 ||
 321             numerator/denominator >= ((uint32_t)-1)/10000000)
 322                 return (uint32_t)-1;
 323
 324         /* Divide both the denominator and the multiplier by two until
 325          * numerator * multiplier doesn't overflow. If anyone knows a better
 326          * algorithm please let me know.
 327          */
 328         multiplier = 10000000;
 329         while (numerator > ((uint32_t)-1)/multiplier) {
 330                 multiplier /= 2;
 331                 denominator /= 2;
 332         }
 333
 334         return denominator ? numerator * multiplier / denominator : 0;
 335 }
 336
 337 /* ------------------------------------------------------------------------
 338  * Terminal and unit management
 339  */
 340
 341 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 342 {
 343         struct uvc_entity *entity;
 344
 345         list_for_each_entry(entity, &dev->entities, list) {
 346                 if (entity->id == id)
 347                         return entity;
 348         }
 349
 350         return NULL;
 351 }
 352
 353 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 354         int id, struct uvc_entity *entity)
 355 {
 356         unsigned int i;
 357
 358         if (entity == NULL)
 359                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 360
 361         list_for_each_entry_continue(entity, &dev->entities, list) {
 362                 for (i = 0; i < entity->bNrInPins; ++i)
 363                         if (entity->baSourceID[i] == id)
 364                                 return entity;
 365         }
 366
 367         return NULL;
 368 }
 369
 370 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 371 {
 372         struct uvc_streaming *stream;
 373
 374         list_for_each_entry(stream, &dev->streams, list) {
 375                 if (stream->header.bTerminalLink == id)
 376                         return stream;
 377         }
 378
 379         return NULL;
 380 }
 381
 382 /* ------------------------------------------------------------------------
 383  * Descriptors parsing
 384  */
 385
 386 static int uvc_parse_format(struct uvc_device *dev,
 387         struct uvc_streaming *streaming, struct uvc_format *format,
 388         __u32 **intervals, unsigned char *buffer, int buflen)
 389 {
 390         struct usb_interface *intf = streaming->intf;
 391         struct usb_host_interface *alts = intf->cur_altsetting;
 392         struct uvc_format_desc *fmtdesc;
 393         struct uvc_frame *frame;
 394         const unsigned char *start = buffer;
 395         unsigned int width_multiplier = 1;
 396         unsigned int interval;
 397         unsigned int i, n;
 398         __u8 ftype;
 399
 400         format->type = buffer[2];
 401         format->index = buffer[3];
 402
 403         switch (buffer[2]) {
 404         case UVC_VS_FORMAT_UNCOMPRESSED:
 405         case UVC_VS_FORMAT_FRAME_BASED:
 406                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 407                 if (buflen < n) {
 408                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 409                                "interface %d FORMAT error\n",
 410                                dev->udev->devnum,
 411                                alts->desc.bInterfaceNumber);
 412                         return -EINVAL;
 413                 }
 414
 415                 /* Find the format descriptor from its GUID. */
 416                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 417
 418                 if (fmtdesc != NULL) {
 419                         strlcpy(format->name, fmtdesc->name,
 420                                 sizeof format->name);
 421                         format->fcc = fmtdesc->fcc;
 422                 } else {
 423                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 424                                 &buffer[5]);
 425                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 426                                 &buffer[5]);
 427                         format->fcc = 0;
 428                 }
 429
 430                 format->bpp = buffer[21];
 431
 432                 /* Some devices report a format that doesn't match what they
 433                  * really send.
 434                  */
 435                 if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
 436                         if (format->fcc == V4L2_PIX_FMT_YUYV) {
 437                                 strlcpy(format->name, "Greyscale 8-bit (Y8  )",
 438                                         sizeof(format->name));
 439                                 format->fcc = V4L2_PIX_FMT_GREY;
 440                                 format->bpp = 8;
 441                                 width_multiplier = 2;
 442                         }
 443                 }
 444
 445                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 446                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 447                 } else {
 448                         ftype = UVC_VS_FRAME_FRAME_BASED;
 449                         if (buffer[27])
 450                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 451                 }
 452                 break;
 453
 454         case UVC_VS_FORMAT_MJPEG:
 455                 if (buflen < 11) {
 456                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 457                                "interface %d FORMAT error\n",
 458                                dev->udev->devnum,
 459                                alts->desc.bInterfaceNumber);
 460                         return -EINVAL;
 461                 }
 462
 463                 strlcpy(format->name, "MJPEG", sizeof format->name);
 464                 format->fcc = V4L2_PIX_FMT_MJPEG;
 465                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 466                 format->bpp = 0;
 467                 ftype = UVC_VS_FRAME_MJPEG;
 468                 break;
 469
 470         case UVC_VS_FORMAT_DV:
 471                 if (buflen < 9) {
 472                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 473                                "interface %d FORMAT error\n",
 474                                dev->udev->devnum,
 475                                alts->desc.bInterfaceNumber);
 476                         return -EINVAL;
 477                 }
 478
 479                 switch (buffer[8] & 0x7f) {
 480                 case 0:
 481                         strlcpy(format->name, "SD-DV", sizeof format->name);
 482                         break;
 483                 case 1:
 484                         strlcpy(format->name, "SDL-DV", sizeof format->name);
 485                         break;
 486                 case 2:
 487                         strlcpy(format->name, "HD-DV", sizeof format->name);
 488                         break;
 489                 default:
 490                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 491                                "interface %d: unknown DV format %u\n",
 492                                dev->udev->devnum,
 493                                alts->desc.bInterfaceNumber, buffer[8]);
 494                         return -EINVAL;
 495                 }
 496
 497                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 498                         sizeof format->name);
 499
 500                 format->fcc = V4L2_PIX_FMT_DV;
 501                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 502                 format->bpp = 0;
 503                 ftype = 0;
 504
 505                 /* Create a dummy frame descriptor. */
 506                 frame = &format->frame[0];
 507                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 508                 frame->bFrameIntervalType = 1;
 509                 frame->dwDefaultFrameInterval = 1;
 510                 frame->dwFrameInterval = *intervals;
 511                 *(*intervals)++ = 1;
 512                 format->nframes = 1;
 513                 break;
 514
 515         case UVC_VS_FORMAT_MPEG2TS:
 516         case UVC_VS_FORMAT_STREAM_BASED:
 517                 /* Not supported yet. */
 518         default:
 519                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 520                        "interface %d unsupported format %u\n",
 521                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 522                        buffer[2]);
 523                 return -EINVAL;
 524         }
 525
 526         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 527
 528         buflen -= buffer[0];
 529         buffer += buffer[0];
 530
 531         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 532          * based formats have frame descriptors.
 533          */
 534         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 535                buffer[2] == ftype) {
 536                 frame = &format->frame[format->nframes];
 537                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 538                         n = buflen > 25 ? buffer[25] : 0;
 539                 else
 540                         n = buflen > 21 ? buffer[21] : 0;
 541
 542                 n = n ? n : 3;
 543
 544                 if (buflen < 26 + 4*n) {
 545                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 546                                "interface %d FRAME error\n", dev->udev->devnum,
 547                                alts->desc.bInterfaceNumber);
 548                         return -EINVAL;
 549                 }
 550
 551                 frame->bFrameIndex = buffer[3];
 552                 frame->bmCapabilities = buffer[4];
 553                 frame->wWidth = get_unaligned_le16(&buffer[5])
 554                               * width_multiplier;
 555                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 556                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 557                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 558                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 559                         frame->dwMaxVideoFrameBufferSize =
 560                                 get_unaligned_le32(&buffer[17]);
 561                         frame->dwDefaultFrameInterval =
 562                                 get_unaligned_le32(&buffer[21]);
 563                         frame->bFrameIntervalType = buffer[25];
 564                 } else {
 565                         frame->dwMaxVideoFrameBufferSize = 0;
 566                         frame->dwDefaultFrameInterval =
 567                                 get_unaligned_le32(&buffer[17]);
 568                         frame->bFrameIntervalType = buffer[21];
 569                 }
 570                 frame->dwFrameInterval = *intervals;
 571
 572                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 573                  * completely. Observed behaviours range from setting the
 574                  * value to 1.1x the actual frame size to hardwiring the
 575                  * 16 low bits to 0. This results in a higher than necessary
 576                  * memory usage as well as a wrong image size information. For
 577                  * uncompressed formats this can be fixed by computing the
 578                  * value from the frame size.
 579                  */
 580                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 581                         frame->dwMaxVideoFrameBufferSize = format->bpp
 582                                 * frame->wWidth * frame->wHeight / 8;
 583
 584                 /* Some bogus devices report dwMinFrameInterval equal to
 585                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 586                  * zero. Setting all null intervals to 1 fixes the problem and
 587                  * some other divisions by zero that could happen.
 588                  */
 589                 for (i = 0; i < n; ++i) {
 590                         interval = get_unaligned_le32(&buffer[26+4*i]);
 591                         *(*intervals)++ = interval ? interval : 1;
 592                 }
 593
 594                 /* Make sure that the default frame interval stays between
 595                  * the boundaries.
 596                  */
 597                 n -= frame->bFrameIntervalType ? 1 : 2;
 598                 frame->dwDefaultFrameInterval =
 599                         min(frame->dwFrameInterval[n],
 600                             max(frame->dwFrameInterval[0],
 601                                 frame->dwDefaultFrameInterval));
 602
 603                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 604                         frame->bFrameIntervalType = 1;
 605                         frame->dwFrameInterval[0] =
 606                                 frame->dwDefaultFrameInterval;
 607                 }
 608
 609                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 610                         frame->wWidth, frame->wHeight,
 611                         10000000/frame->dwDefaultFrameInterval,
 612                         (100000000/frame->dwDefaultFrameInterval)%10);
 613
 614                 format->nframes++;
 615                 buflen -= buffer[0];
 616                 buffer += buffer[0];
 617         }
 618
 619         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 620             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 621                 buflen -= buffer[0];
 622                 buffer += buffer[0];
 623         }
 624
 625         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 626             buffer[2] == UVC_VS_COLORFORMAT) {
 627                 if (buflen < 6) {
 628                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 629                                "interface %d COLORFORMAT error\n",
 630                                dev->udev->devnum,
 631                                alts->desc.bInterfaceNumber);
 632                         return -EINVAL;
 633                 }
 634
 635                 format->colorspace = uvc_colorspace(buffer[3]);
 636
 637                 buflen -= buffer[0];
 638                 buffer += buffer[0];
 639         }
 640
 641         return buffer - start;
 642 }
 643
 644 static int uvc_parse_streaming(struct uvc_device *dev,
 645         struct usb_interface *intf)
 646 {
 647         struct uvc_streaming *streaming = NULL;
 648         struct uvc_format *format;
 649         struct uvc_frame *frame;
 650         struct usb_host_interface *alts = &intf->altsetting[0];
 651         unsigned char *_buffer, *buffer = alts->extra;
 652         int _buflen, buflen = alts->extralen;
 653         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 654         unsigned int size, i, n, p;
 655         __u32 *interval;
 656         __u16 psize;
 657         int ret = -EINVAL;
 658
 659         if (intf->cur_altsetting->desc.bInterfaceSubClass
 660                 != UVC_SC_VIDEOSTREAMING) {
 661                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 662                         "video streaming interface\n", dev->udev->devnum,
 663                         intf->altsetting[0].desc.bInterfaceNumber);
 664                 return -EINVAL;
 665         }
 666
 667         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 668                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 669                         "claimed\n", dev->udev->devnum,
 670                         intf->altsetting[0].desc.bInterfaceNumber);
 671                 return -EINVAL;
 672         }
 673
 674         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 675         if (streaming == NULL) {
 676                 usb_driver_release_interface(&uvc_driver.driver, intf);
 677                 return -EINVAL;
 678         }
 679
 680         mutex_init(&streaming->mutex);
 681         streaming->dev = dev;
 682         streaming->intf = usb_get_intf(intf);
 683         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 684
 685         /* The Pico iMage webcam has its class-specific interface descriptors
 686          * after the endpoint descriptors.
 687          */
 688         if (buflen == 0) {
 689                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 690                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 691
 692                         if (ep->extralen == 0)
 693                                 continue;
 694
 695                         if (ep->extralen > 2 &&
 696                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 697                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 698                                         "from endpoint %u.\n", i);
 699                                 buffer = alts->endpoint[i].extra;
 700                                 buflen = alts->endpoint[i].extralen;
 701                                 break;
 702                         }
 703                 }
 704         }
 705
 706         /* Skip the standard interface descriptors. */
 707         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 708                 buflen -= buffer[0];
 709                 buffer += buffer[0];
 710         }
 711
 712         if (buflen <= 2) {
 713                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 714                         "interface descriptors found.\n");
 715                 goto error;
 716         }
 717
 718         /* Parse the header descriptor. */
 719         switch (buffer[2]) {
 720         case UVC_VS_OUTPUT_HEADER:
 721                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 722                 size = 9;
 723                 break;
 724
 725         case UVC_VS_INPUT_HEADER:
 726                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 727                 size = 13;
 728                 break;
 729
 730         default:
 731                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 732                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 733                         alts->desc.bInterfaceNumber);
 734                 goto error;
 735         }
 736
 737         p = buflen >= 4 ? buffer[3] : 0;
 738         n = buflen >= size ? buffer[size-1] : 0;
 739
 740         if (buflen < size + p*n) {
 741                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 742                         "interface %d HEADER descriptor is invalid.\n",
 743                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 744                 goto error;
 745         }
 746
 747         streaming->header.bNumFormats = p;
 748         streaming->header.bEndpointAddress = buffer[6];
 749         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 750                 streaming->header.bmInfo = buffer[7];
 751                 streaming->header.bTerminalLink = buffer[8];
 752                 streaming->header.bStillCaptureMethod = buffer[9];
 753                 streaming->header.bTriggerSupport = buffer[10];
 754                 streaming->header.bTriggerUsage = buffer[11];
 755         } else {
 756                 streaming->header.bTerminalLink = buffer[7];
 757         }
 758         streaming->header.bControlSize = n;
 759
 760         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 761                                                 GFP_KERNEL);
 762         if (streaming->header.bmaControls == NULL) {
 763                 ret = -ENOMEM;
 764                 goto error;
 765         }
 766
 767         buflen -= buffer[0];
 768         buffer += buffer[0];
 769
 770         _buffer = buffer;
 771         _buflen = buflen;
 772
 773         /* Count the format and frame descriptors. */
 774         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 775                 switch (_buffer[2]) {
 776                 case UVC_VS_FORMAT_UNCOMPRESSED:
 777                 case UVC_VS_FORMAT_MJPEG:
 778                 case UVC_VS_FORMAT_FRAME_BASED:
 779                         nformats++;
 780                         break;
 781
 782                 case UVC_VS_FORMAT_DV:
 783                         /* DV format has no frame descriptor. We will create a
 784                          * dummy frame descriptor with a dummy frame interval.
 785                          */
 786                         nformats++;
 787                         nframes++;
 788                         nintervals++;
 789                         break;
 790
 791                 case UVC_VS_FORMAT_MPEG2TS:
 792                 case UVC_VS_FORMAT_STREAM_BASED:
 793                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 794                                 "interface %d FORMAT %u is not supported.\n",
 795                                 dev->udev->devnum,
 796                                 alts->desc.bInterfaceNumber, _buffer[2]);
 797                         break;
 798
 799                 case UVC_VS_FRAME_UNCOMPRESSED:
 800                 case UVC_VS_FRAME_MJPEG:
 801                         nframes++;
 802                         if (_buflen > 25)
 803                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 804                         break;
 805
 806                 case UVC_VS_FRAME_FRAME_BASED:
 807                         nframes++;
 808                         if (_buflen > 21)
 809                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 810                         break;
 811                 }
 812
 813                 _buflen -= _buffer[0];
 814                 _buffer += _buffer[0];
 815         }
 816
 817         if (nformats == 0) {
 818                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 819                         "%d has no supported formats defined.\n",
 820                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 821                 goto error;
 822         }
 823
 824         size = nformats * sizeof *format + nframes * sizeof *frame
 825              + nintervals * sizeof *interval;
 826         format = kzalloc(size, GFP_KERNEL);
 827         if (format == NULL) {
 828                 ret = -ENOMEM;
 829                 goto error;
 830         }
 831
 832         frame = (struct uvc_frame *)&format[nformats];
 833         interval = (__u32 *)&frame[nframes];
 834
 835         streaming->format = format;
 836         streaming->nformats = nformats;
 837
 838         /* Parse the format descriptors. */
 839         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 840                 switch (buffer[2]) {
 841                 case UVC_VS_FORMAT_UNCOMPRESSED:
 842                 case UVC_VS_FORMAT_MJPEG:
 843                 case UVC_VS_FORMAT_DV:
 844                 case UVC_VS_FORMAT_FRAME_BASED:
 845                         format->frame = frame;
 846                         ret = uvc_parse_format(dev, streaming, format,
 847                                 &interval, buffer, buflen);
 848                         if (ret < 0)
 849                                 goto error;
 850
 851                         frame += format->nframes;
 852                         format++;
 853
 854                         buflen -= ret;
 855                         buffer += ret;
 856                         continue;
 857
 858                 default:
 859                         break;
 860                 }
 861
 862                 buflen -= buffer[0];
 863                 buffer += buffer[0];
 864         }
 865
 866         if (buflen)
 867                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 868                         "%d has %u bytes of trailing descriptor garbage.\n",
 869                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 870
 871         /* Parse the alternate settings to find the maximum bandwidth. */
 872         for (i = 0; i < intf->num_altsetting; ++i) {
 873                 struct usb_host_endpoint *ep;
 874                 alts = &intf->altsetting[i];
 875                 ep = uvc_find_endpoint(alts,
 876                                 streaming->header.bEndpointAddress);
 877                 if (ep == NULL)
 878                         continue;
 879
 880                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 881                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 882                 if (psize > streaming->maxpsize)
 883                         streaming->maxpsize = psize;
 884         }
 885
 886         list_add_tail(&streaming->list, &dev->streams);
 887         return 0;
 888
 889 error:
 890         usb_driver_release_interface(&uvc_driver.driver, intf);
 891         usb_put_intf(intf);
 892         kfree(streaming->format);
 893         kfree(streaming->header.bmaControls);
 894         kfree(streaming);
 895         return ret;
 896 }
 897
 898 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 899                 unsigned int num_pads, unsigned int extra_size)
 900 {
 901         struct uvc_entity *entity;
 902         unsigned int num_inputs;
 903         unsigned int size;
 904         unsigned int i;
 905
 906         extra_size = ALIGN(extra_size, sizeof(*entity->pads));
 907         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 908         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 909              + num_inputs;
 910         entity = kzalloc(size, GFP_KERNEL);
 911         if (entity == NULL)
 912                 return NULL;
 913
 914         entity->id = id;
 915         entity->type = type;
 916
 917         entity->num_links = 0;
 918         entity->num_pads = num_pads;
 919         entity->pads = ((void *)(entity + 1)) + extra_size;
 920
 921         for (i = 0; i < num_inputs; ++i)
 922                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 923         if (!UVC_ENTITY_IS_OTERM(entity))
 924                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 925
 926         entity->bNrInPins = num_inputs;
 927         entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
 928
 929         return entity;
 930 }
 931
 932 /* Parse vendor-specific extensions. */
 933 static int uvc_parse_vendor_control(struct uvc_device *dev,
 934         const unsigned char *buffer, int buflen)
 935 {
 936         struct usb_device *udev = dev->udev;
 937         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 938         struct uvc_entity *unit;
 939         unsigned int n, p;
 940         int handled = 0;
 941
 942         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 943         case 0x046d:            /* Logitech */
 944                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 945                         break;
 946
 947                 /* Logitech implements several vendor specific functions
 948                  * through vendor specific extension units (LXU).
 949                  *
 950                  * The LXU descriptors are similar to XU descriptors
 951                  * (see "USB Device Video Class for Video Devices", section
 952                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 953                  * differences:
 954                  *
 955                  * ----------------------------------------------------------
 956                  * 0            bLength         1        Number
 957                  *      Size of this descriptor, in bytes: 24+p+n*2
 958                  * ----------------------------------------------------------
 959                  * 23+p+n       bmControlsType  N       Bitmap
 960                  *      Individual bits in the set are defined:
 961                  *      0: Absolute
 962                  *      1: Relative
 963                  *
 964                  *      This bitset is mapped exactly the same as bmControls.
 965                  * ----------------------------------------------------------
 966                  * 23+p+n*2     bReserved       1       Boolean
 967                  * ----------------------------------------------------------
 968                  * 24+p+n*2     iExtension      1       Index
 969                  *      Index of a string descriptor that describes this
 970                  *      extension unit.
 971                  * ----------------------------------------------------------
 972                  */
 973                 p = buflen >= 22 ? buffer[21] : 0;
 974                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 975
 976                 if (buflen < 25 + p + 2*n) {
 977                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 978                                 "interface %d EXTENSION_UNIT error\n",
 979                                 udev->devnum, alts->desc.bInterfaceNumber);
 980                         break;
 981                 }
 982
 983                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
 984                                         p + 1, 2*n);
 985                 if (unit == NULL)
 986                         return -ENOMEM;
 987
 988                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 989                 unit->extension.bNumControls = buffer[20];
 990                 memcpy(unit->baSourceID, &buffer[22], p);
 991                 unit->extension.bControlSize = buffer[22+p];
 992                 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
 993                 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
 994                                                + n;
 995                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 996
 997                 if (buffer[24+p+2*n] != 0)
 998                         usb_string(udev, buffer[24+p+2*n], unit->name,
 999                                    sizeof unit->name);
1000                 else
1001                         sprintf(unit->name, "Extension %u", buffer[3]);
1002
1003                 list_add_tail(&unit->list, &dev->entities);
1004                 handled = 1;
1005                 break;
1006         }
1007
1008         return handled;
1009 }
1010
1011 static int uvc_parse_standard_control(struct uvc_device *dev,
1012         const unsigned char *buffer, int buflen)
1013 {
1014         struct usb_device *udev = dev->udev;
1015         struct uvc_entity *unit, *term;
1016         struct usb_interface *intf;
1017         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1018         unsigned int i, n, p, len;
1019         __u16 type;
1020
1021         switch (buffer[2]) {
1022         case UVC_VC_HEADER:
1023                 n = buflen >= 12 ? buffer[11] : 0;
1024
1025                 if (buflen < 12 + n) {
1026                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1027                                 "interface %d HEADER error\n", udev->devnum,
1028                                 alts->desc.bInterfaceNumber);
1029                         return -EINVAL;
1030                 }
1031
1032                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
1033                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
1034
1035                 /* Parse all USB Video Streaming interfaces. */
1036                 for (i = 0; i < n; ++i) {
1037                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
1038                         if (intf == NULL) {
1039                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
1040                                         "interface %d doesn't exists\n",
1041                                         udev->devnum, i);
1042                                 continue;
1043                         }
1044
1045                         uvc_parse_streaming(dev, intf);
1046                 }
1047                 break;
1048
1049         case UVC_VC_INPUT_TERMINAL:
1050                 if (buflen < 8) {
1051                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1052                                 "interface %d INPUT_TERMINAL error\n",
1053                                 udev->devnum, alts->desc.bInterfaceNumber);
1054                         return -EINVAL;
1055                 }
1056
1057                 /* Make sure the terminal type MSB is not null, otherwise it
1058                  * could be confused with a unit.
1059                  */
1060                 type = get_unaligned_le16(&buffer[4]);
1061                 if ((type & 0xff00) == 0) {
1062                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1063                                 "interface %d INPUT_TERMINAL %d has invalid "
1064                                 "type 0x%04x, skipping\n", udev->devnum,
1065                                 alts->desc.bInterfaceNumber,
1066                                 buffer[3], type);
1067                         return 0;
1068                 }
1069
1070                 n = 0;
1071                 p = 0;
1072                 len = 8;
1073
1074                 if (type == UVC_ITT_CAMERA) {
1075                         n = buflen >= 15 ? buffer[14] : 0;
1076                         len = 15;
1077
1078                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1079                         n = buflen >= 9 ? buffer[8] : 0;
1080                         p = buflen >= 10 + n ? buffer[9+n] : 0;
1081                         len = 10;
1082                 }
1083
1084                 if (buflen < len + n + p) {
1085                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1086                                 "interface %d INPUT_TERMINAL error\n",
1087                                 udev->devnum, alts->desc.bInterfaceNumber);
1088                         return -EINVAL;
1089                 }
1090
1091                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
1092                                         1, n + p);
1093                 if (term == NULL)
1094                         return -ENOMEM;
1095
1096                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1097                         term->camera.bControlSize = n;
1098                         term->camera.bmControls = (__u8 *)term + sizeof *term;
1099                         term->camera.wObjectiveFocalLengthMin =
1100                                 get_unaligned_le16(&buffer[8]);
1101                         term->camera.wObjectiveFocalLengthMax =
1102                                 get_unaligned_le16(&buffer[10]);
1103                         term->camera.wOcularFocalLength =
1104                                 get_unaligned_le16(&buffer[12]);
1105                         memcpy(term->camera.bmControls, &buffer[15], n);
1106                 } else if (UVC_ENTITY_TYPE(term) ==
1107                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1108                         term->media.bControlSize = n;
1109                         term->media.bmControls = (__u8 *)term + sizeof *term;
1110                         term->media.bTransportModeSize = p;
1111                         term->media.bmTransportModes = (__u8 *)term
1112                                                      + sizeof *term + n;
1113                         memcpy(term->media.bmControls, &buffer[9], n);
1114                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1115                 }
1116
1117                 if (buffer[7] != 0)
1118                         usb_string(udev, buffer[7], term->name,
1119                                    sizeof term->name);
1120                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1121                         sprintf(term->name, "Camera %u", buffer[3]);
1122                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1123                         sprintf(term->name, "Media %u", buffer[3]);
1124                 else
1125                         sprintf(term->name, "Input %u", buffer[3]);
1126
1127                 list_add_tail(&term->list, &dev->entities);
1128                 break;
1129
1130         case UVC_VC_OUTPUT_TERMINAL:
1131                 if (buflen < 9) {
1132                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1133                                 "interface %d OUTPUT_TERMINAL error\n",
1134                                 udev->devnum, alts->desc.bInterfaceNumber);
1135                         return -EINVAL;
1136                 }
1137
1138                 /* Make sure the terminal type MSB is not null, otherwise it
1139                  * could be confused with a unit.
1140                  */
1141                 type = get_unaligned_le16(&buffer[4]);
1142                 if ((type & 0xff00) == 0) {
1143                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1144                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1145                                 "type 0x%04x, skipping\n", udev->devnum,
1146                                 alts->desc.bInterfaceNumber, buffer[3], type);
1147                         return 0;
1148                 }
1149
1150                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1151                                         1, 0);
1152                 if (term == NULL)
1153                         return -ENOMEM;
1154
1155                 memcpy(term->baSourceID, &buffer[7], 1);
1156
1157                 if (buffer[8] != 0)
1158                         usb_string(udev, buffer[8], term->name,
1159                                    sizeof term->name);
1160                 else
1161                         sprintf(term->name, "Output %u", buffer[3]);
1162
1163                 list_add_tail(&term->list, &dev->entities);
1164                 break;
1165
1166         case UVC_VC_SELECTOR_UNIT:
1167                 p = buflen >= 5 ? buffer[4] : 0;
1168
1169                 if (buflen < 5 || buflen < 6 + p) {
1170                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1171                                 "interface %d SELECTOR_UNIT error\n",
1172                                 udev->devnum, alts->desc.bInterfaceNumber);
1173                         return -EINVAL;
1174                 }
1175
1176                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1177                 if (unit == NULL)
1178                         return -ENOMEM;
1179
1180                 memcpy(unit->baSourceID, &buffer[5], p);
1181
1182                 if (buffer[5+p] != 0)
1183                         usb_string(udev, buffer[5+p], unit->name,
1184                                    sizeof unit->name);
1185                 else
1186                         sprintf(unit->name, "Selector %u", buffer[3]);
1187
1188                 list_add_tail(&unit->list, &dev->entities);
1189                 break;
1190
1191         case UVC_VC_PROCESSING_UNIT:
1192                 n = buflen >= 8 ? buffer[7] : 0;
1193                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1194
1195                 if (buflen < p + n) {
1196                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1197                                 "interface %d PROCESSING_UNIT error\n",
1198                                 udev->devnum, alts->desc.bInterfaceNumber);
1199                         return -EINVAL;
1200                 }
1201
1202                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1203                 if (unit == NULL)
1204                         return -ENOMEM;
1205
1206                 memcpy(unit->baSourceID, &buffer[4], 1);
1207                 unit->processing.wMaxMultiplier =
1208                         get_unaligned_le16(&buffer[5]);
1209                 unit->processing.bControlSize = buffer[7];
1210                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1211                 memcpy(unit->processing.bmControls, &buffer[8], n);
1212                 if (dev->uvc_version >= 0x0110)
1213                         unit->processing.bmVideoStandards = buffer[9+n];
1214
1215                 if (buffer[8+n] != 0)
1216                         usb_string(udev, buffer[8+n], unit->name,
1217                                    sizeof unit->name);
1218                 else
1219                         sprintf(unit->name, "Processing %u", buffer[3]);
1220
1221                 list_add_tail(&unit->list, &dev->entities);
1222                 break;
1223
1224         case UVC_VC_EXTENSION_UNIT:
1225                 p = buflen >= 22 ? buffer[21] : 0;
1226                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1227
1228                 if (buflen < 24 + p + n) {
1229                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1230                                 "interface %d EXTENSION_UNIT error\n",
1231                                 udev->devnum, alts->desc.bInterfaceNumber);
1232                         return -EINVAL;
1233                 }
1234
1235                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1236                 if (unit == NULL)
1237                         return -ENOMEM;
1238
1239                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1240                 unit->extension.bNumControls = buffer[20];
1241                 memcpy(unit->baSourceID, &buffer[22], p);
1242                 unit->extension.bControlSize = buffer[22+p];
1243                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1244                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1245
1246                 if (buffer[23+p+n] != 0)
1247                         usb_string(udev, buffer[23+p+n], unit->name,
1248                                    sizeof unit->name);
1249                 else
1250                         sprintf(unit->name, "Extension %u", buffer[3]);
1251
1252                 list_add_tail(&unit->list, &dev->entities);
1253                 break;
1254
1255         default:
1256                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1257                         "descriptor (%u)\n", buffer[2]);
1258                 break;
1259         }
1260
1261         return 0;
1262 }
1263
1264 static int uvc_parse_control(struct uvc_device *dev)
1265 {
1266         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1267         unsigned char *buffer = alts->extra;
1268         int buflen = alts->extralen;
1269         int ret;
1270
1271         /* Parse the default alternate setting only, as the UVC specification
1272          * defines a single alternate setting, the default alternate setting
1273          * zero.
1274          */
1275
1276         while (buflen > 2) {
1277                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1278                     buffer[1] != USB_DT_CS_INTERFACE)
1279                         goto next_descriptor;
1280
1281                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1282                         return ret;
1283
1284 next_descriptor:
1285                 buflen -= buffer[0];
1286                 buffer += buffer[0];
1287         }
1288
1289         /* Check if the optional status endpoint is present. Built-in iSight
1290          * webcams have an interrupt endpoint but spit proprietary data that
1291          * don't conform to the UVC status endpoint messages. Don't try to
1292          * handle the interrupt endpoint for those cameras.
1293          */
1294         if (alts->desc.bNumEndpoints == 1 &&
1295             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1296                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1297                 struct usb_endpoint_descriptor *desc = &ep->desc;
1298
1299                 if (usb_endpoint_is_int_in(desc) &&
1300                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1301                     desc->bInterval != 0) {
1302                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1303                                 "(addr %02x).\n", desc->bEndpointAddress);
1304                         dev->int_ep = ep;
1305                 }
1306         }
1307
1308         return 0;
1309 }
1310
1311 /* ------------------------------------------------------------------------
1312  * UVC device scan
1313  */
1314
1315 /*
1316  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1317  * and containing the following units:
1318  *
1319  * - one or more Output Terminals (USB Streaming or Display)
1320  * - zero or one Processing Unit
1321  * - zero, one or more single-input Selector Units
1322  * - zero or one multiple-input Selector Units, provided all inputs are
1323  *   connected to input terminals
1324  * - zero, one or mode single-input Extension Units
1325  * - one or more Input Terminals (Camera, External or USB Streaming)
1326  *
1327  * The terminal and units must match on of the following structures:
1328  *
1329  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1330  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1331  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1332  *
1333  *                 +---------+    +---------+ -> OTT_*(0)
1334  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1335  *                 +---------+    +---------+ -> OTT_*(n)
1336  *
1337  * The Processing Unit and Extension Units can be in any order. Additional
1338  * Extension Units connected to the main chain as single-unit branches are
1339  * also supported. Single-input Selector Units are ignored.
1340  */
1341 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1342         struct uvc_entity *entity)
1343 {
1344         switch (UVC_ENTITY_TYPE(entity)) {
1345         case UVC_VC_EXTENSION_UNIT:
1346                 if (uvc_trace_param & UVC_TRACE_PROBE)
1347                         printk(KERN_CONT " <- XU %d", entity->id);
1348
1349                 if (entity->bNrInPins != 1) {
1350                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1351                                 "than 1 input pin.\n", entity->id);
1352                         return -1;
1353                 }
1354
1355                 break;
1356
1357         case UVC_VC_PROCESSING_UNIT:
1358                 if (uvc_trace_param & UVC_TRACE_PROBE)
1359                         printk(KERN_CONT " <- PU %d", entity->id);
1360
1361                 if (chain->processing != NULL) {
1362                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1363                                 "Processing Units in chain.\n");
1364                         return -1;
1365                 }
1366
1367                 chain->processing = entity;
1368                 break;
1369
1370         case UVC_VC_SELECTOR_UNIT:
1371                 if (uvc_trace_param & UVC_TRACE_PROBE)
1372                         printk(KERN_CONT " <- SU %d", entity->id);
1373
1374                 /* Single-input selector units are ignored. */
1375                 if (entity->bNrInPins == 1)
1376                         break;
1377
1378                 if (chain->selector != NULL) {
1379                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1380                                 "Units in chain.\n");
1381                         return -1;
1382                 }
1383
1384                 chain->selector = entity;
1385                 break;
1386
1387         case UVC_ITT_VENDOR_SPECIFIC:
1388         case UVC_ITT_CAMERA:
1389         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1390                 if (uvc_trace_param & UVC_TRACE_PROBE)
1391                         printk(KERN_CONT " <- IT %d\n", entity->id);
1392
1393                 break;
1394
1395         case UVC_OTT_VENDOR_SPECIFIC:
1396         case UVC_OTT_DISPLAY:
1397         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1398                 if (uvc_trace_param & UVC_TRACE_PROBE)
1399                         printk(KERN_CONT " OT %d", entity->id);
1400
1401                 break;
1402
1403         case UVC_TT_STREAMING:
1404                 if (UVC_ENTITY_IS_ITERM(entity)) {
1405                         if (uvc_trace_param & UVC_TRACE_PROBE)
1406                                 printk(KERN_CONT " <- IT %d\n", entity->id);
1407                 } else {
1408                         if (uvc_trace_param & UVC_TRACE_PROBE)
1409                                 printk(KERN_CONT " OT %d", entity->id);
1410                 }
1411
1412                 break;
1413
1414         default:
1415                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1416                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1417                 return -1;
1418         }
1419
1420         list_add_tail(&entity->chain, &chain->entities);
1421         return 0;
1422 }
1423
1424 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1425         struct uvc_entity *entity, struct uvc_entity *prev)
1426 {
1427         struct uvc_entity *forward;
1428         int found;
1429
1430         /* Forward scan */
1431         forward = NULL;
1432         found = 0;
1433
1434         while (1) {
1435                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1436                         forward);
1437                 if (forward == NULL)
1438                         break;
1439                 if (forward == prev)
1440                         continue;
1441
1442                 switch (UVC_ENTITY_TYPE(forward)) {
1443                 case UVC_VC_EXTENSION_UNIT:
1444                         if (forward->bNrInPins != 1) {
1445                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1446                                           "has more than 1 input pin.\n",
1447                                           entity->id);
1448                                 return -EINVAL;
1449                         }
1450
1451                         list_add_tail(&forward->chain, &chain->entities);
1452                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1453                                 if (!found)
1454                                         printk(KERN_CONT " (->");
1455
1456                                 printk(KERN_CONT " XU %d", forward->id);
1457                                 found = 1;
1458                         }
1459                         break;
1460
1461                 case UVC_OTT_VENDOR_SPECIFIC:
1462                 case UVC_OTT_DISPLAY:
1463                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1464                 case UVC_TT_STREAMING:
1465                         if (UVC_ENTITY_IS_ITERM(forward)) {
1466                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1467                                         "terminal %u.\n", forward->id);
1468                                 return -EINVAL;
1469                         }
1470
1471                         list_add_tail(&forward->chain, &chain->entities);
1472                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1473                                 if (!found)
1474                                         printk(KERN_CONT " (->");
1475
1476                                 printk(KERN_CONT " OT %d", forward->id);
1477                                 found = 1;
1478                         }
1479                         break;
1480                 }
1481         }
1482         if (found)
1483                 printk(KERN_CONT ")");
1484
1485         return 0;
1486 }
1487
1488 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1489         struct uvc_entity **_entity)
1490 {
1491         struct uvc_entity *entity = *_entity;
1492         struct uvc_entity *term;
1493         int id = -EINVAL, i;
1494
1495         switch (UVC_ENTITY_TYPE(entity)) {
1496         case UVC_VC_EXTENSION_UNIT:
1497         case UVC_VC_PROCESSING_UNIT:
1498                 id = entity->baSourceID[0];
1499                 break;
1500
1501         case UVC_VC_SELECTOR_UNIT:
1502                 /* Single-input selector units are ignored. */
1503                 if (entity->bNrInPins == 1) {
1504                         id = entity->baSourceID[0];
1505                         break;
1506                 }
1507
1508                 if (uvc_trace_param & UVC_TRACE_PROBE)
1509                         printk(KERN_CONT " <- IT");
1510
1511                 chain->selector = entity;
1512                 for (i = 0; i < entity->bNrInPins; ++i) {
1513                         id = entity->baSourceID[i];
1514                         term = uvc_entity_by_id(chain->dev, id);
1515                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1516                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1517                                         "input %d isn't connected to an "
1518                                         "input terminal\n", entity->id, i);
1519                                 return -1;
1520                         }
1521
1522                         if (uvc_trace_param & UVC_TRACE_PROBE)
1523                                 printk(KERN_CONT " %d", term->id);
1524
1525                         list_add_tail(&term->chain, &chain->entities);
1526                         uvc_scan_chain_forward(chain, term, entity);
1527                 }
1528
1529                 if (uvc_trace_param & UVC_TRACE_PROBE)
1530                         printk(KERN_CONT "\n");
1531
1532                 id = 0;
1533                 break;
1534
1535         case UVC_ITT_VENDOR_SPECIFIC:
1536         case UVC_ITT_CAMERA:
1537         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1538         case UVC_OTT_VENDOR_SPECIFIC:
1539         case UVC_OTT_DISPLAY:
1540         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1541         case UVC_TT_STREAMING:
1542                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1543                 break;
1544         }
1545
1546         if (id <= 0) {
1547                 *_entity = NULL;
1548                 return id;
1549         }
1550
1551         entity = uvc_entity_by_id(chain->dev, id);
1552         if (entity == NULL) {
1553                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1554                         "unknown entity %d.\n", id);
1555                 return -EINVAL;
1556         }
1557
1558         *_entity = entity;
1559         return 0;
1560 }
1561
1562 static int uvc_scan_chain(struct uvc_video_chain *chain,
1563                           struct uvc_entity *term)
1564 {
1565         struct uvc_entity *entity, *prev;
1566
1567         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1568
1569         entity = term;
1570         prev = NULL;
1571
1572         while (entity != NULL) {
1573                 /* Entity must not be part of an existing chain */
1574                 if (entity->chain.next || entity->chain.prev) {
1575                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1576                                 "entity %d already in chain.\n", entity->id);
1577                         return -EINVAL;
1578                 }
1579
1580                 /* Process entity */
1581                 if (uvc_scan_chain_entity(chain, entity) < 0)
1582                         return -EINVAL;
1583
1584                 /* Forward scan */
1585                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1586                         return -EINVAL;
1587
1588                 /* Backward scan */
1589                 prev = entity;
1590                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1591                         return -EINVAL;
1592         }
1593
1594         return 0;
1595 }
1596
1597 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1598                 char *buffer)
1599 {
1600         struct uvc_entity *term;
1601         unsigned int nterms = 0;
1602         char *p = buffer;
1603
1604         list_for_each_entry(term, terms, chain) {
1605                 if (!UVC_ENTITY_IS_TERM(term) ||
1606                     UVC_TERM_DIRECTION(term) != dir)
1607                         continue;
1608
1609                 if (nterms)
1610                         p += sprintf(p, ",");
1611                 if (++nterms >= 4) {
1612                         p += sprintf(p, "...");
1613                         break;
1614                 }
1615                 p += sprintf(p, "%u", term->id);
1616         }
1617
1618         return p - buffer;
1619 }
1620
1621 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1622 {
1623         static char buffer[43];
1624         char *p = buffer;
1625
1626         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1627         p += sprintf(p, " -> ");
1628         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1629
1630         return buffer;
1631 }
1632
1633 static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev)
1634 {
1635         struct uvc_video_chain *chain;
1636
1637         chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1638         if (chain == NULL)
1639                 return NULL;
1640
1641         INIT_LIST_HEAD(&chain->entities);
1642         mutex_init(&chain->ctrl_mutex);
1643         chain->dev = dev;
1644         v4l2_prio_init(&chain->prio);
1645
1646         return chain;
1647 }
1648
1649 /*
1650  * Fallback heuristic for devices that don't connect units and terminals in a
1651  * valid chain.
1652  *
1653  * Some devices have invalid baSourceID references, causing uvc_scan_chain()
1654  * to fail, but if we just take the entities we can find and put them together
1655  * in the most sensible chain we can think of, turns out they do work anyway.
1656  * Note: This heuristic assumes there is a single chain.
1657  *
1658  * At the time of writing, devices known to have such a broken chain are
1659  *  - Acer Integrated Camera (5986:055a)
1660  *  - Realtek rtl157a7 (0bda:57a7)
1661  */
1662 static int uvc_scan_fallback(struct uvc_device *dev)
1663 {
1664         struct uvc_video_chain *chain;
1665         struct uvc_entity *iterm = NULL;
1666         struct uvc_entity *oterm = NULL;
1667         struct uvc_entity *entity;
1668         struct uvc_entity *prev;
1669
1670         /*
1671          * Start by locating the input and output terminals. We only support
1672          * devices with exactly one of each for now.
1673          */
1674         list_for_each_entry(entity, &dev->entities, list) {
1675                 if (UVC_ENTITY_IS_ITERM(entity)) {
1676                         if (iterm)
1677                                 return -EINVAL;
1678                         iterm = entity;
1679                 }
1680
1681                 if (UVC_ENTITY_IS_OTERM(entity)) {
1682                         if (oterm)
1683                                 return -EINVAL;
1684                         oterm = entity;
1685                 }
1686         }
1687
1688         if (iterm == NULL || oterm == NULL)
1689                 return -EINVAL;
1690
1691         /* Allocate the chain and fill it. */
1692         chain = uvc_alloc_chain(dev);
1693         if (chain == NULL)
1694                 return -ENOMEM;
1695
1696         if (uvc_scan_chain_entity(chain, oterm) < 0)
1697                 goto error;
1698
1699         prev = oterm;
1700
1701         /*
1702          * Add all Processing and Extension Units with two pads. The order
1703          * doesn't matter much, use reverse list traversal to connect units in
1704          * UVC descriptor order as we build the chain from output to input. This
1705          * leads to units appearing in the order meant by the manufacturer for
1706          * the cameras known to require this heuristic.
1707          */
1708         list_for_each_entry_reverse(entity, &dev->entities, list) {
1709                 if (entity->type != UVC_VC_PROCESSING_UNIT &&
1710                     entity->type != UVC_VC_EXTENSION_UNIT)
1711                         continue;
1712
1713                 if (entity->num_pads != 2)
1714                         continue;
1715
1716                 if (uvc_scan_chain_entity(chain, entity) < 0)
1717                         goto error;
1718
1719                 prev->baSourceID[0] = entity->id;
1720                 prev = entity;
1721         }
1722
1723         if (uvc_scan_chain_entity(chain, iterm) < 0)
1724                 goto error;
1725
1726         prev->baSourceID[0] = iterm->id;
1727
1728         list_add_tail(&chain->list, &dev->chains);
1729
1730         uvc_trace(UVC_TRACE_PROBE,
1731                   "Found a video chain by fallback heuristic (%s).\n",
1732                   uvc_print_chain(chain));
1733
1734         return 0;
1735
1736 error:
1737         kfree(chain);
1738         return -EINVAL;
1739 }
1740
1741 /*
1742  * Scan the device for video chains and register video devices.
1743  *
1744  * Chains are scanned starting at their output terminals and walked backwards.
1745  */
1746 static int uvc_scan_device(struct uvc_device *dev)
1747 {
1748         struct uvc_video_chain *chain;
1749         struct uvc_entity *term;
1750
1751         list_for_each_entry(term, &dev->entities, list) {
1752                 if (!UVC_ENTITY_IS_OTERM(term))
1753                         continue;
1754
1755                 /* If the terminal is already included in a chain, skip it.
1756                  * This can happen for chains that have multiple output
1757                  * terminals, where all output terminals beside the first one
1758                  * will be inserted in the chain in forward scans.
1759                  */
1760                 if (term->chain.next || term->chain.prev)
1761                         continue;
1762
1763                 chain = uvc_alloc_chain(dev);
1764                 if (chain == NULL)
1765                         return -ENOMEM;
1766
1767                 term->flags |= UVC_ENTITY_FLAG_DEFAULT;
1768
1769                 if (uvc_scan_chain(chain, term) < 0) {
1770                         kfree(chain);
1771                         continue;
1772                 }
1773
1774                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1775                           uvc_print_chain(chain));
1776
1777                 list_add_tail(&chain->list, &dev->chains);
1778         }
1779
1780         if (list_empty(&dev->chains))
1781                 uvc_scan_fallback(dev);
1782
1783         if (list_empty(&dev->chains)) {
1784                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1785                 return -1;
1786         }
1787
1788         return 0;
1789 }
1790
1791 /* ------------------------------------------------------------------------
1792  * Video device registration and unregistration
1793  */
1794
1795 /*
1796  * Delete the UVC device.
1797  *
1798  * Called by the kernel when the last reference to the uvc_device structure
1799  * is released.
1800  *
1801  * As this function is called after or during disconnect(), all URBs have
1802  * already been canceled by the USB core. There is no need to kill the
1803  * interrupt URB manually.
1804  */
1805 static void uvc_delete(struct kref *kref)
1806 {
1807         struct uvc_device *dev = container_of(kref, struct uvc_device, ref);
1808         struct list_head *p, *n;
1809
1810         uvc_status_cleanup(dev);
1811         uvc_ctrl_cleanup_device(dev);
1812
1813         usb_put_intf(dev->intf);
1814         usb_put_dev(dev->udev);
1815
1816         if (dev->vdev.dev)
1817                 v4l2_device_unregister(&dev->vdev);
1818 #ifdef CONFIG_MEDIA_CONTROLLER
1819         if (media_devnode_is_registered(dev->mdev.devnode))
1820                 media_device_unregister(&dev->mdev);
1821         media_device_cleanup(&dev->mdev);
1822 #endif
1823
1824         list_for_each_safe(p, n, &dev->chains) {
1825                 struct uvc_video_chain *chain;
1826                 chain = list_entry(p, struct uvc_video_chain, list);
1827                 kfree(chain);
1828         }
1829
1830         list_for_each_safe(p, n, &dev->entities) {
1831                 struct uvc_entity *entity;
1832                 entity = list_entry(p, struct uvc_entity, list);
1833 #ifdef CONFIG_MEDIA_CONTROLLER
1834                 uvc_mc_cleanup_entity(entity);
1835 #endif
1836                 kfree(entity);
1837         }
1838
1839         list_for_each_safe(p, n, &dev->streams) {
1840                 struct uvc_streaming *streaming;
1841                 streaming = list_entry(p, struct uvc_streaming, list);
1842                 usb_driver_release_interface(&uvc_driver.driver,
1843                         streaming->intf);
1844                 usb_put_intf(streaming->intf);
1845                 kfree(streaming->format);
1846                 kfree(streaming->header.bmaControls);
1847                 kfree(streaming);
1848         }
1849
1850         kfree(dev);
1851 }
1852
1853 static void uvc_release(struct video_device *vdev)
1854 {
1855         struct uvc_streaming *stream = video_get_drvdata(vdev);
1856         struct uvc_device *dev = stream->dev;
1857
1858         kref_put(&dev->ref, uvc_delete);
1859 }
1860
1861 /*
1862  * Unregister the video devices.
1863  */
1864 static void uvc_unregister_video(struct uvc_device *dev)
1865 {
1866         struct uvc_streaming *stream;
1867
1868         /* Unregistering all video devices might result in uvc_delete() being
1869          * called from inside the loop if there's no open file handle. To avoid
1870          * that, increment the refcount before iterating over the streams and
1871          * decrement it when done.
1872          */
1873         kref_get(&dev->ref);
1874
1875         list_for_each_entry(stream, &dev->streams, list) {
1876                 if (!video_is_registered(&stream->vdev))
1877                         continue;
1878
1879                 video_unregister_device(&stream->vdev);
1880
1881                 uvc_debugfs_cleanup_stream(stream);
1882         }
1883
1884         kref_put(&dev->ref, uvc_delete);
1885 }
1886
1887 static int uvc_register_video(struct uvc_device *dev,
1888                 struct uvc_streaming *stream)
1889 {
1890         struct video_device *vdev = &stream->vdev;
1891         int ret;
1892
1893         /* Initialize the video buffers queue. */
1894         ret = uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param);
1895         if (ret)
1896                 return ret;
1897
1898         /* Initialize the streaming interface with default streaming
1899          * parameters.
1900          */
1901         ret = uvc_video_init(stream);
1902         if (ret < 0) {
1903                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1904                         "(%d).\n", ret);
1905                 return ret;
1906         }
1907
1908         uvc_debugfs_init_stream(stream);
1909
1910         /* Register the device with V4L. */
1911
1912         /* We already hold a reference to dev->udev. The video device will be
1913          * unregistered before the reference is released, so we don't need to
1914          * get another one.
1915          */
1916         vdev->v4l2_dev = &dev->vdev;
1917         vdev->fops = &uvc_fops;
1918         vdev->ioctl_ops = &uvc_ioctl_ops;
1919         vdev->release = uvc_release;
1920         vdev->prio = &stream->chain->prio;
1921         if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1922                 vdev->vfl_dir = VFL_DIR_TX;
1923         strlcpy(vdev->name, dev->name, sizeof vdev->name);
1924
1925         /* Set the driver data before calling video_register_device, otherwise
1926          * uvc_v4l2_open might race us.
1927          */
1928         video_set_drvdata(vdev, stream);
1929
1930         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1931         if (ret < 0) {
1932                 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1933                            ret);
1934                 return ret;
1935         }
1936
1937         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1938                 stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE;
1939         else
1940                 stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
1941
1942         kref_get(&dev->ref);
1943         return 0;
1944 }
1945
1946 /*
1947  * Register all video devices in all chains.
1948  */
1949 static int uvc_register_terms(struct uvc_device *dev,
1950         struct uvc_video_chain *chain)
1951 {
1952         struct uvc_streaming *stream;
1953         struct uvc_entity *term;
1954         int ret;
1955
1956         list_for_each_entry(term, &chain->entities, chain) {
1957                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1958                         continue;
1959
1960                 stream = uvc_stream_by_id(dev, term->id);
1961                 if (stream == NULL) {
1962                         uvc_printk(KERN_INFO, "No streaming interface found "
1963                                    "for terminal %u.", term->id);
1964                         continue;
1965                 }
1966
1967                 stream->chain = chain;
1968                 ret = uvc_register_video(dev, stream);
1969                 if (ret < 0)
1970                         return ret;
1971
1972                 term->vdev = &stream->vdev;
1973         }
1974
1975         return 0;
1976 }
1977
1978 static int uvc_register_chains(struct uvc_device *dev)
1979 {
1980         struct uvc_video_chain *chain;
1981         int ret;
1982
1983         list_for_each_entry(chain, &dev->chains, list) {
1984                 ret = uvc_register_terms(dev, chain);
1985                 if (ret < 0)
1986                         return ret;
1987
1988 #ifdef CONFIG_MEDIA_CONTROLLER
1989                 ret = uvc_mc_register_entities(chain);
1990                 if (ret < 0) {
1991                         uvc_printk(KERN_INFO, "Failed to register entites "
1992                                 "(%d).\n", ret);
1993                 }
1994 #endif
1995         }
1996
1997         return 0;
1998 }
1999
2000 /* ------------------------------------------------------------------------
2001  * USB probe, disconnect, suspend and resume
2002  */
2003
2004 static int uvc_probe(struct usb_interface *intf,
2005                      const struct usb_device_id *id)
2006 {
2007         struct usb_device *udev = interface_to_usbdev(intf);
2008         struct uvc_device *dev;
2009         int function;
2010         int ret;
2011
2012         if (id->idVendor && id->idProduct)
2013                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
2014                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
2015                                 id->idProduct);
2016         else
2017                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
2018                                 udev->devpath);
2019
2020         /* Allocate memory for the device and initialize it. */
2021         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
2022                 return -ENOMEM;
2023
2024         INIT_LIST_HEAD(&dev->entities);
2025         INIT_LIST_HEAD(&dev->chains);
2026         INIT_LIST_HEAD(&dev->streams);
2027         kref_init(&dev->ref);
2028         atomic_set(&dev->nmappings, 0);
2029         mutex_init(&dev->lock);
2030
2031         dev->udev = usb_get_dev(udev);
2032         dev->intf = usb_get_intf(intf);
2033         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
2034         dev->quirks = (uvc_quirks_param == -1)
2035                     ? id->driver_info : uvc_quirks_param;
2036
2037         if (udev->product != NULL)
2038                 strlcpy(dev->name, udev->product, sizeof dev->name);
2039         else
2040                 snprintf(dev->name, sizeof dev->name,
2041                          "UVC Camera (%04x:%04x)",
2042                          le16_to_cpu(udev->descriptor.idVendor),
2043                          le16_to_cpu(udev->descriptor.idProduct));
2044
2045         /*
2046          * Add iFunction or iInterface to names when available as additional
2047          * distinguishers between interfaces. iFunction is prioritized over
2048          * iInterface which matches Windows behavior at the point of writing.
2049          */
2050         if (intf->intf_assoc && intf->intf_assoc->iFunction != 0)
2051                 function = intf->intf_assoc->iFunction;
2052         else
2053                 function = intf->cur_altsetting->desc.iInterface;
2054         if (function != 0) {
2055                 size_t len;
2056
2057                 strlcat(dev->name, ": ", sizeof(dev->name));
2058                 len = strlen(dev->name);
2059                 usb_string(udev, function, dev->name + len,
2060                            sizeof(dev->name) - len);
2061         }
2062
2063         /* Parse the Video Class control descriptor. */
2064         if (uvc_parse_control(dev) < 0) {
2065                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
2066                         "descriptors.\n");
2067                 goto error;
2068         }
2069
2070         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
2071                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
2072                 udev->product ? udev->product : "<unnamed>",
2073                 le16_to_cpu(udev->descriptor.idVendor),
2074                 le16_to_cpu(udev->descriptor.idProduct));
2075
2076         if (dev->quirks != id->driver_info) {
2077                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
2078                         "parameter for testing purpose.\n", dev->quirks);
2079                 uvc_printk(KERN_INFO, "Please report required quirks to the "
2080                         "linux-uvc-devel mailing list.\n");
2081         }
2082
2083         /* Initialize the media device and register the V4L2 device. */
2084 #ifdef CONFIG_MEDIA_CONTROLLER
2085         dev->mdev.dev = &intf->dev;
2086         strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
2087         if (udev->serial)
2088                 strlcpy(dev->mdev.serial, udev->serial,
2089                         sizeof(dev->mdev.serial));
2090         strcpy(dev->mdev.bus_info, udev->devpath);
2091         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
2092         media_device_init(&dev->mdev);
2093
2094         dev->vdev.mdev = &dev->mdev;
2095 #endif
2096         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
2097                 goto error;
2098
2099         /* Initialize controls. */
2100         if (uvc_ctrl_init_device(dev) < 0)
2101                 goto error;
2102
2103         /* Scan the device for video chains. */
2104         if (uvc_scan_device(dev) < 0)
2105                 goto error;
2106
2107         /* Register video device nodes. */
2108         if (uvc_register_chains(dev) < 0)
2109                 goto error;
2110
2111 #ifdef CONFIG_MEDIA_CONTROLLER
2112         /* Register the media device node */
2113         if (media_device_register(&dev->mdev) < 0)
2114                 goto error;
2115 #endif
2116         /* Save our data pointer in the interface data. */
2117         usb_set_intfdata(intf, dev);
2118
2119         /* Initialize the interrupt URB. */
2120         if ((ret = uvc_status_init(dev)) < 0) {
2121                 uvc_printk(KERN_INFO, "Unable to initialize the status "
2122                         "endpoint (%d), status interrupt will not be "
2123                         "supported.\n", ret);
2124         }
2125
2126         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
2127         usb_enable_autosuspend(udev);
2128         return 0;
2129
2130 error:
2131         uvc_unregister_video(dev);
2132         return -ENODEV;
2133 }
2134
2135 static void uvc_disconnect(struct usb_interface *intf)
2136 {
2137         struct uvc_device *dev = usb_get_intfdata(intf);
2138
2139         /* Set the USB interface data to NULL. This can be done outside the
2140          * lock, as there's no other reader.
2141          */
2142         usb_set_intfdata(intf, NULL);
2143
2144         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2145             UVC_SC_VIDEOSTREAMING)
2146                 return;
2147
2148         uvc_unregister_video(dev);
2149 }
2150
2151 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
2152 {
2153         struct uvc_device *dev = usb_get_intfdata(intf);
2154         struct uvc_streaming *stream;
2155
2156         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
2157                 intf->cur_altsetting->desc.bInterfaceNumber);
2158
2159         /* Controls are cached on the fly so they don't need to be saved. */
2160         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2161             UVC_SC_VIDEOCONTROL) {
2162                 mutex_lock(&dev->lock);
2163                 if (dev->users)
2164                         uvc_status_stop(dev);
2165                 mutex_unlock(&dev->lock);
2166                 return 0;
2167         }
2168
2169         list_for_each_entry(stream, &dev->streams, list) {
2170                 if (stream->intf == intf)
2171                         return uvc_video_suspend(stream);
2172         }
2173
2174         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
2175                         "mismatch.\n");
2176         return -EINVAL;
2177 }
2178
2179 static int __uvc_resume(struct usb_interface *intf, int reset)
2180 {
2181         struct uvc_device *dev = usb_get_intfdata(intf);
2182         struct uvc_streaming *stream;
2183         int ret = 0;
2184
2185         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
2186                 intf->cur_altsetting->desc.bInterfaceNumber);
2187
2188         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2189             UVC_SC_VIDEOCONTROL) {
2190                 if (reset) {
2191                         ret = uvc_ctrl_restore_values(dev);
2192                         if (ret < 0)
2193                                 return ret;
2194                 }
2195
2196                 mutex_lock(&dev->lock);
2197                 if (dev->users)
2198                         ret = uvc_status_start(dev, GFP_NOIO);
2199                 mutex_unlock(&dev->lock);
2200
2201                 return ret;
2202         }
2203
2204         list_for_each_entry(stream, &dev->streams, list) {
2205                 if (stream->intf == intf) {
2206                         ret = uvc_video_resume(stream, reset);
2207                         if (ret < 0)
2208                                 uvc_queue_streamoff(&stream->queue,
2209                                                     stream->queue.queue.type);
2210                         return ret;
2211                 }
2212         }
2213
2214         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
2215                         "mismatch.\n");
2216         return -EINVAL;
2217 }
2218
2219 static int uvc_resume(struct usb_interface *intf)
2220 {
2221         return __uvc_resume(intf, 0);
2222 }
2223
2224 static int uvc_reset_resume(struct usb_interface *intf)
2225 {
2226         return __uvc_resume(intf, 1);
2227 }
2228
2229 /* ------------------------------------------------------------------------
2230  * Module parameters
2231  */
2232
2233 static int uvc_clock_param_get(char *buffer, const struct kernel_param *kp)
2234 {
2235         if (uvc_clock_param == CLOCK_MONOTONIC)
2236                 return sprintf(buffer, "CLOCK_MONOTONIC");
2237         else
2238                 return sprintf(buffer, "CLOCK_REALTIME");
2239 }
2240
2241 static int uvc_clock_param_set(const char *val, const struct kernel_param *kp)
2242 {
2243         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2244                 val += strlen("clock_");
2245
2246         if (strcasecmp(val, "monotonic") == 0)
2247                 uvc_clock_param = CLOCK_MONOTONIC;
2248         else if (strcasecmp(val, "realtime") == 0)
2249                 uvc_clock_param = CLOCK_REALTIME;
2250         else
2251                 return -EINVAL;
2252
2253         return 0;
2254 }
2255
2256 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2257                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2258 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2259 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, S_IRUGO|S_IWUSR);
2260 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
2261 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2262 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2263 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2264 MODULE_PARM_DESC(quirks, "Forced device quirks");
2265 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2266 MODULE_PARM_DESC(trace, "Trace level bitmask");
2267 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2268 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2269
2270 /* ------------------------------------------------------------------------
2271  * Driver initialization and cleanup
2272  */
2273
2274 /*
2275  * The Logitech cameras listed below have their interface class set to
2276  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2277  * though they are compliant.
2278  */
2279 static const struct usb_device_id uvc_ids[] = {
2280         /* LogiLink Wireless Webcam */
2281         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2282                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2283           .idVendor             = 0x0416,
2284           .idProduct            = 0xa91a,
2285           .bInterfaceClass      = USB_CLASS_VIDEO,
2286           .bInterfaceSubClass   = 1,
2287           .bInterfaceProtocol   = 0,
2288           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2289         /* Genius eFace 2025 */
2290         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2291                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2292           .idVendor             = 0x0458,
2293           .idProduct            = 0x706e,
2294           .bInterfaceClass      = USB_CLASS_VIDEO,
2295           .bInterfaceSubClass   = 1,
2296           .bInterfaceProtocol   = 0,
2297           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2298         /* Microsoft Lifecam NX-6000 */
2299         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2300                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2301           .idVendor             = 0x045e,
2302           .idProduct            = 0x00f8,
2303           .bInterfaceClass      = USB_CLASS_VIDEO,
2304           .bInterfaceSubClass   = 1,
2305           .bInterfaceProtocol   = 0,
2306           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2307         /* Microsoft Lifecam NX-3000 */
2308         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2309                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2310           .idVendor             = 0x045e,
2311           .idProduct            = 0x0721,
2312           .bInterfaceClass      = USB_CLASS_VIDEO,
2313           .bInterfaceSubClass   = 1,
2314           .bInterfaceProtocol   = 0,
2315           .driver_info          = UVC_QUIRK_PROBE_DEF },
2316         /* Microsoft Lifecam VX-7000 */
2317         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2318                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2319           .idVendor             = 0x045e,
2320           .idProduct            = 0x0723,
2321           .bInterfaceClass      = USB_CLASS_VIDEO,
2322           .bInterfaceSubClass   = 1,
2323           .bInterfaceProtocol   = 0,
2324           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2325         /* Logitech Quickcam Fusion */
2326         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2327                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2328           .idVendor             = 0x046d,
2329           .idProduct            = 0x08c1,
2330           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2331           .bInterfaceSubClass   = 1,
2332           .bInterfaceProtocol   = 0 },
2333         /* Logitech Quickcam Orbit MP */
2334         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2335                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2336           .idVendor             = 0x046d,
2337           .idProduct            = 0x08c2,
2338           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2339           .bInterfaceSubClass   = 1,
2340           .bInterfaceProtocol   = 0 },
2341         /* Logitech Quickcam Pro for Notebook */
2342         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2343                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2344           .idVendor             = 0x046d,
2345           .idProduct            = 0x08c3,
2346           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2347           .bInterfaceSubClass   = 1,
2348           .bInterfaceProtocol   = 0 },
2349         /* Logitech Quickcam Pro 5000 */
2350         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2351                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2352           .idVendor             = 0x046d,
2353           .idProduct            = 0x08c5,
2354           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2355           .bInterfaceSubClass   = 1,
2356           .bInterfaceProtocol   = 0 },
2357         /* Logitech Quickcam OEM Dell Notebook */
2358         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2359                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2360           .idVendor             = 0x046d,
2361           .idProduct            = 0x08c6,
2362           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2363           .bInterfaceSubClass   = 1,
2364           .bInterfaceProtocol   = 0 },
2365         /* Logitech Quickcam OEM Cisco VT Camera II */
2366         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2367                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2368           .idVendor             = 0x046d,
2369           .idProduct            = 0x08c7,
2370           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2371           .bInterfaceSubClass   = 1,
2372           .bInterfaceProtocol   = 0 },
2373         /* Logitech HD Pro Webcam C920 */
2374         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2375                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2376           .idVendor             = 0x046d,
2377           .idProduct            = 0x082d,
2378           .bInterfaceClass      = USB_CLASS_VIDEO,
2379           .bInterfaceSubClass   = 1,
2380           .bInterfaceProtocol   = 0,
2381           .driver_info          = UVC_QUIRK_RESTORE_CTRLS_ON_INIT },
2382         /* Chicony CNF7129 (Asus EEE 100HE) */
2383         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2384                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2385           .idVendor             = 0x04f2,
2386           .idProduct            = 0xb071,
2387           .bInterfaceClass      = USB_CLASS_VIDEO,
2388           .bInterfaceSubClass   = 1,
2389           .bInterfaceProtocol   = 0,
2390           .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
2391         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2392         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2393                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2394           .idVendor             = 0x058f,
2395           .idProduct            = 0x3820,
2396           .bInterfaceClass      = USB_CLASS_VIDEO,
2397           .bInterfaceSubClass   = 1,
2398           .bInterfaceProtocol   = 0,
2399           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2400         /* Dell XPS m1530 */
2401         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2402                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2403           .idVendor             = 0x05a9,
2404           .idProduct            = 0x2640,
2405           .bInterfaceClass      = USB_CLASS_VIDEO,
2406           .bInterfaceSubClass   = 1,
2407           .bInterfaceProtocol   = 0,
2408           .driver_info          = UVC_QUIRK_PROBE_DEF },
2409         /* Dell SP2008WFP Monitor */
2410         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2411                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2412           .idVendor             = 0x05a9,
2413           .idProduct            = 0x2641,
2414           .bInterfaceClass      = USB_CLASS_VIDEO,
2415           .bInterfaceSubClass   = 1,
2416           .bInterfaceProtocol   = 0,
2417           .driver_info          = UVC_QUIRK_PROBE_DEF },
2418         /* Dell Alienware X51 */
2419         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2420                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2421           .idVendor             = 0x05a9,
2422           .idProduct            = 0x2643,
2423           .bInterfaceClass      = USB_CLASS_VIDEO,
2424           .bInterfaceSubClass   = 1,
2425           .bInterfaceProtocol   = 0,
2426           .driver_info  = UVC_QUIRK_PROBE_DEF },
2427         /* Dell Studio Hybrid 140g (OmniVision webcam) */
2428         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2429                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2430           .idVendor             = 0x05a9,
2431           .idProduct            = 0x264a,
2432           .bInterfaceClass      = USB_CLASS_VIDEO,
2433           .bInterfaceSubClass   = 1,
2434           .bInterfaceProtocol   = 0,
2435           .driver_info          = UVC_QUIRK_PROBE_DEF },
2436         /* Dell XPS M1330 (OmniVision OV7670 webcam) */
2437         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2438                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2439           .idVendor             = 0x05a9,
2440           .idProduct            = 0x7670,
2441           .bInterfaceClass      = USB_CLASS_VIDEO,
2442           .bInterfaceSubClass   = 1,
2443           .bInterfaceProtocol   = 0,
2444           .driver_info          = UVC_QUIRK_PROBE_DEF },
2445         /* Apple Built-In iSight */
2446         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2447                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2448           .idVendor             = 0x05ac,
2449           .idProduct            = 0x8501,
2450           .bInterfaceClass      = USB_CLASS_VIDEO,
2451           .bInterfaceSubClass   = 1,
2452           .bInterfaceProtocol   = 0,
2453           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2454                                 | UVC_QUIRK_BUILTIN_ISIGHT },
2455         /* Apple Built-In iSight via iBridge */
2456         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2457                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2458           .idVendor             = 0x05ac,
2459           .idProduct            = 0x8600,
2460           .bInterfaceClass      = USB_CLASS_VIDEO,
2461           .bInterfaceSubClass   = 1,
2462           .bInterfaceProtocol   = 0,
2463           .driver_info          = UVC_QUIRK_PROBE_DEF },
2464         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2465         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2466                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2467           .idVendor             = 0x05c8,
2468           .idProduct            = 0x0403,
2469           .bInterfaceClass      = USB_CLASS_VIDEO,
2470           .bInterfaceSubClass   = 1,
2471           .bInterfaceProtocol   = 0,
2472           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2473         /* Genesys Logic USB 2.0 PC Camera */
2474         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2475                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2476           .idVendor             = 0x05e3,
2477           .idProduct            = 0x0505,
2478           .bInterfaceClass      = USB_CLASS_VIDEO,
2479           .bInterfaceSubClass   = 1,
2480           .bInterfaceProtocol   = 0,
2481           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2482         /* Hercules Classic Silver */
2483         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2484                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2485           .idVendor             = 0x06f8,
2486           .idProduct            = 0x300c,
2487           .bInterfaceClass      = USB_CLASS_VIDEO,
2488           .bInterfaceSubClass   = 1,
2489           .bInterfaceProtocol   = 0,
2490           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2491         /* ViMicro Vega */
2492         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2493                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2494           .idVendor             = 0x0ac8,
2495           .idProduct            = 0x332d,
2496           .bInterfaceClass      = USB_CLASS_VIDEO,
2497           .bInterfaceSubClass   = 1,
2498           .bInterfaceProtocol   = 0,
2499           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2500         /* ViMicro - Minoru3D */
2501         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2502                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2503           .idVendor             = 0x0ac8,
2504           .idProduct            = 0x3410,
2505           .bInterfaceClass      = USB_CLASS_VIDEO,
2506           .bInterfaceSubClass   = 1,
2507           .bInterfaceProtocol   = 0,
2508           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2509         /* ViMicro Venus - Minoru3D */
2510         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2511                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2512           .idVendor             = 0x0ac8,
2513           .idProduct            = 0x3420,
2514           .bInterfaceClass      = USB_CLASS_VIDEO,
2515           .bInterfaceSubClass   = 1,
2516           .bInterfaceProtocol   = 0,
2517           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2518         /* Ophir Optronics - SPCAM 620U */
2519         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2520                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2521           .idVendor             = 0x0bd3,
2522           .idProduct            = 0x0555,
2523           .bInterfaceClass      = USB_CLASS_VIDEO,
2524           .bInterfaceSubClass   = 1,
2525           .bInterfaceProtocol   = 0,
2526           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2527         /* MT6227 */
2528         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2529                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2530           .idVendor             = 0x0e8d,
2531           .idProduct            = 0x0004,
2532           .bInterfaceClass      = USB_CLASS_VIDEO,
2533           .bInterfaceSubClass   = 1,
2534           .bInterfaceProtocol   = 0,
2535           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2536                                 | UVC_QUIRK_PROBE_DEF },
2537         /* IMC Networks (Medion Akoya) */
2538         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2539                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2540           .idVendor             = 0x13d3,
2541           .idProduct            = 0x5103,
2542           .bInterfaceClass      = USB_CLASS_VIDEO,
2543           .bInterfaceSubClass   = 1,
2544           .bInterfaceProtocol   = 0,
2545           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2546         /* JMicron USB2.0 XGA WebCam */
2547         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2548                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2549           .idVendor             = 0x152d,
2550           .idProduct            = 0x0310,
2551           .bInterfaceClass      = USB_CLASS_VIDEO,
2552           .bInterfaceSubClass   = 1,
2553           .bInterfaceProtocol   = 0,
2554           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2555         /* Syntek (HP Spartan) */
2556         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2557                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2558           .idVendor             = 0x174f,
2559           .idProduct            = 0x5212,
2560           .bInterfaceClass      = USB_CLASS_VIDEO,
2561           .bInterfaceSubClass   = 1,
2562           .bInterfaceProtocol   = 0,
2563           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2564         /* Syntek (Samsung Q310) */
2565         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2566                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2567           .idVendor             = 0x174f,
2568           .idProduct            = 0x5931,
2569           .bInterfaceClass      = USB_CLASS_VIDEO,
2570           .bInterfaceSubClass   = 1,
2571           .bInterfaceProtocol   = 0,
2572           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2573         /* Syntek (Packard Bell EasyNote MX52 */
2574         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2575                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2576           .idVendor             = 0x174f,
2577           .idProduct            = 0x8a12,
2578           .bInterfaceClass      = USB_CLASS_VIDEO,
2579           .bInterfaceSubClass   = 1,
2580           .bInterfaceProtocol   = 0,
2581           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2582         /* Syntek (Asus F9SG) */
2583         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2584                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2585           .idVendor             = 0x174f,
2586           .idProduct            = 0x8a31,
2587           .bInterfaceClass      = USB_CLASS_VIDEO,
2588           .bInterfaceSubClass   = 1,
2589           .bInterfaceProtocol   = 0,
2590           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2591         /* Syntek (Asus U3S) */
2592         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2593                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2594           .idVendor             = 0x174f,
2595           .idProduct            = 0x8a33,
2596           .bInterfaceClass      = USB_CLASS_VIDEO,
2597           .bInterfaceSubClass   = 1,
2598           .bInterfaceProtocol   = 0,
2599           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2600         /* Syntek (JAOtech Smart Terminal) */
2601         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2602                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2603           .idVendor             = 0x174f,
2604           .idProduct            = 0x8a34,
2605           .bInterfaceClass      = USB_CLASS_VIDEO,
2606           .bInterfaceSubClass   = 1,
2607           .bInterfaceProtocol   = 0,
2608           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2609         /* Miricle 307K */
2610         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2611                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2612           .idVendor             = 0x17dc,
2613           .idProduct            = 0x0202,
2614           .bInterfaceClass      = USB_CLASS_VIDEO,
2615           .bInterfaceSubClass   = 1,
2616           .bInterfaceProtocol   = 0,
2617           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2618         /* Lenovo Thinkpad SL400/SL500 */
2619         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2620                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2621           .idVendor             = 0x17ef,
2622           .idProduct            = 0x480b,
2623           .bInterfaceClass      = USB_CLASS_VIDEO,
2624           .bInterfaceSubClass   = 1,
2625           .bInterfaceProtocol   = 0,
2626           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2627         /* Aveo Technology USB 2.0 Camera */
2628         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2629                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2630           .idVendor             = 0x1871,
2631           .idProduct            = 0x0306,
2632           .bInterfaceClass      = USB_CLASS_VIDEO,
2633           .bInterfaceSubClass   = 1,
2634           .bInterfaceProtocol   = 0,
2635           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2636                                 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2637         /* Aveo Technology USB 2.0 Camera (Tasco USB Microscope) */
2638         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2639                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2640           .idVendor             = 0x1871,
2641           .idProduct            = 0x0516,
2642           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2643           .bInterfaceSubClass   = 1,
2644           .bInterfaceProtocol   = 0 },
2645         /* Ecamm Pico iMage */
2646         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2647                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2648           .idVendor             = 0x18cd,
2649           .idProduct            = 0xcafe,
2650           .bInterfaceClass      = USB_CLASS_VIDEO,
2651           .bInterfaceSubClass   = 1,
2652           .bInterfaceProtocol   = 0,
2653           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
2654         /* Manta MM-353 Plako */
2655         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2656                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2657           .idVendor             = 0x18ec,
2658           .idProduct            = 0x3188,
2659           .bInterfaceClass      = USB_CLASS_VIDEO,
2660           .bInterfaceSubClass   = 1,
2661           .bInterfaceProtocol   = 0,
2662           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2663         /* FSC WebCam V30S */
2664         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2665                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2666           .idVendor             = 0x18ec,
2667           .idProduct            = 0x3288,
2668           .bInterfaceClass      = USB_CLASS_VIDEO,
2669           .bInterfaceSubClass   = 1,
2670           .bInterfaceProtocol   = 0,
2671           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2672         /* Arkmicro unbranded */
2673         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2674                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2675           .idVendor             = 0x18ec,
2676           .idProduct            = 0x3290,
2677           .bInterfaceClass      = USB_CLASS_VIDEO,
2678           .bInterfaceSubClass   = 1,
2679           .bInterfaceProtocol   = 0,
2680           .driver_info          = UVC_QUIRK_PROBE_DEF },
2681         /* The Imaging Source USB CCD cameras */
2682         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2683                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2684           .idVendor             = 0x199e,
2685           .idProduct            = 0x8102,
2686           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2687           .bInterfaceSubClass   = 1,
2688           .bInterfaceProtocol   = 0 },
2689         /* Bodelin ProScopeHR */
2690         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2691                                 | USB_DEVICE_ID_MATCH_DEV_HI
2692                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2693           .idVendor             = 0x19ab,
2694           .idProduct            = 0x1000,
2695           .bcdDevice_hi         = 0x0126,
2696           .bInterfaceClass      = USB_CLASS_VIDEO,
2697           .bInterfaceSubClass   = 1,
2698           .bInterfaceProtocol   = 0,
2699           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
2700         /* MSI StarCam 370i */
2701         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2702                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2703           .idVendor             = 0x1b3b,
2704           .idProduct            = 0x2951,
2705           .bInterfaceClass      = USB_CLASS_VIDEO,
2706           .bInterfaceSubClass   = 1,
2707           .bInterfaceProtocol   = 0,
2708           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2709         /* SiGma Micro USB Web Camera */
2710         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2711                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2712           .idVendor             = 0x1c4f,
2713           .idProduct            = 0x3000,
2714           .bInterfaceClass      = USB_CLASS_VIDEO,
2715           .bInterfaceSubClass   = 1,
2716           .bInterfaceProtocol   = 0,
2717           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2718                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2719         /* Oculus VR Positional Tracker DK2 */
2720         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2721                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2722           .idVendor             = 0x2833,
2723           .idProduct            = 0x0201,
2724           .bInterfaceClass      = USB_CLASS_VIDEO,
2725           .bInterfaceSubClass   = 1,
2726           .bInterfaceProtocol   = 0,
2727           .driver_info          = UVC_QUIRK_FORCE_Y8 },
2728         /* Oculus VR Rift Sensor */
2729         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2730                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2731           .idVendor             = 0x2833,
2732           .idProduct            = 0x0211,
2733           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2734           .bInterfaceSubClass   = 1,
2735           .bInterfaceProtocol   = 0,
2736           .driver_info          = UVC_QUIRK_FORCE_Y8 },
2737         /* Generic USB Video Class */
2738         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_UNDEFINED) },
2739         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_15) },
2740         {}
2741 };
2742
2743 MODULE_DEVICE_TABLE(usb, uvc_ids);
2744
2745 struct uvc_driver uvc_driver = {
2746         .driver = {
2747                 .name           = "uvcvideo",
2748                 .probe          = uvc_probe,
2749                 .disconnect     = uvc_disconnect,
2750                 .suspend        = uvc_suspend,
2751                 .resume         = uvc_resume,
2752                 .reset_resume   = uvc_reset_resume,
2753                 .id_table       = uvc_ids,
2754                 .supports_autosuspend = 1,
2755         },
2756 };
2757
2758 static int __init uvc_init(void)
2759 {
2760         int ret;
2761
2762         uvc_debugfs_init();
2763
2764         ret = usb_register(&uvc_driver.driver);
2765         if (ret < 0) {
2766                 uvc_debugfs_cleanup();
2767                 return ret;
2768         }
2769
2770         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2771         return 0;
2772 }
2773
2774 static void __exit uvc_cleanup(void)
2775 {
2776         usb_deregister(&uvc_driver.driver);
2777         uvc_debugfs_cleanup();
2778 }
2779
2780 module_init(uvc_init);
2781 module_exit(uvc_cleanup);
2782
2783 MODULE_AUTHOR(DRIVER_AUTHOR);
2784 MODULE_DESCRIPTION(DRIVER_DESC);
2785 MODULE_LICENSE("GPL");
2786 MODULE_VERSION(DRIVER_VERSION);
2787