drivers/media/usb/em28xx/em28xx-video.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
   4 //                  video capture devices
   5 //
   6 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   7 //                    Markus Rechberger <mrechberger@gmail.com>
   8 //                    Mauro Carvalho Chehab <mchehab@kernel.org>
   9 //                    Sascha Sommer <saschasommer@freenet.de>
  10 // Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
  11 //
  12 //      Some parts based on SN9C10x PC Camera Controllers GPL driver made
  13 //              by Luca Risolia <luca.risolia@studio.unibo.it>
  14 //
  15 // This program is free software; you can redistribute it and/or modify
  16 // it under the terms of the GNU General Public License as published by
  17 // the Free Software Foundation; either version 2 of the License, or
  18 // (at your option) any later version.
  19 //
  20 // This program is distributed in the hope that it will be useful,
  21 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 // GNU General Public License for more details.
  24
  25 #include "em28xx.h"
  26
  27 #include <linux/init.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/usb.h>
  33 #include <linux/i2c.h>
  34 #include <linux/mm.h>
  35 #include <linux/mutex.h>
  36 #include <linux/slab.h>
  37
  38 #include "em28xx-v4l.h"
  39 #include <media/v4l2-common.h>
  40 #include <media/v4l2-ioctl.h>
  41 #include <media/v4l2-event.h>
  42 #include <media/drv-intf/msp3400.h>
  43 #include <media/tuner.h>
  44
  45 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  46                       "Markus Rechberger <mrechberger@gmail.com>, " \
  47                       "Mauro Carvalho Chehab <mchehab@kernel.org>, " \
  48                       "Sascha Sommer <saschasommer@freenet.de>"
  49
  50 static unsigned int isoc_debug;
  51 module_param(isoc_debug, int, 0644);
  52 MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
  53
  54 static unsigned int disable_vbi;
  55 module_param(disable_vbi, int, 0644);
  56 MODULE_PARM_DESC(disable_vbi, "disable vbi support");
  57
  58 static int alt;
  59 module_param(alt, int, 0644);
  60 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
  61
  62 #define em28xx_videodbg(fmt, arg...) do {                               \
  63         if (video_debug)                                                \
  64                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  65                            "video: %s: " fmt, __func__, ## arg);        \
  66 } while (0)
  67
  68 #define em28xx_isocdbg(fmt, arg...) do {\
  69         if (isoc_debug) \
  70                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  71                            "isoc: %s: " fmt, __func__, ## arg);         \
  72 } while (0)
  73
  74 MODULE_AUTHOR(DRIVER_AUTHOR);
  75 MODULE_DESCRIPTION(DRIVER_DESC " - v4l2 interface");
  76 MODULE_LICENSE("GPL v2");
  77 MODULE_VERSION(EM28XX_VERSION);
  78
  79 #define EM25XX_FRMDATAHDR_BYTE1                 0x02
  80 #define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE     0x20
  81 #define EM25XX_FRMDATAHDR_BYTE2_FRAME_END       0x02
  82 #define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID        0x01
  83 #define EM25XX_FRMDATAHDR_BYTE2_MASK    (EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
  84                                          EM25XX_FRMDATAHDR_BYTE2_FRAME_END |   \
  85                                          EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)
  86
  87 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
  88 static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
  89 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
  90
  91 module_param_array(video_nr, int, NULL, 0444);
  92 module_param_array(vbi_nr, int, NULL, 0444);
  93 module_param_array(radio_nr, int, NULL, 0444);
  94 MODULE_PARM_DESC(video_nr, "video device numbers");
  95 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
  96 MODULE_PARM_DESC(radio_nr, "radio device numbers");
  97
  98 static unsigned int video_debug;
  99 module_param(video_debug, int, 0644);
 100 MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
 101
 102 /* supported video standards */
 103 static struct em28xx_fmt format[] = {
 104         {
 105                 .fourcc   = V4L2_PIX_FMT_YUYV,
 106                 .depth    = 16,
 107                 .reg      = EM28XX_OUTFMT_YUV422_Y0UY1V,
 108         }, {
 109                 .fourcc   = V4L2_PIX_FMT_RGB565,
 110                 .depth    = 16,
 111                 .reg      = EM28XX_OUTFMT_RGB_16_656,
 112         }, {
 113                 .fourcc   = V4L2_PIX_FMT_SRGGB8,
 114                 .depth    = 8,
 115                 .reg      = EM28XX_OUTFMT_RGB_8_RGRG,
 116         }, {
 117                 .fourcc   = V4L2_PIX_FMT_SBGGR8,
 118                 .depth    = 8,
 119                 .reg      = EM28XX_OUTFMT_RGB_8_BGBG,
 120         }, {
 121                 .fourcc   = V4L2_PIX_FMT_SGRBG8,
 122                 .depth    = 8,
 123                 .reg      = EM28XX_OUTFMT_RGB_8_GRGR,
 124         }, {
 125                 .fourcc   = V4L2_PIX_FMT_SGBRG8,
 126                 .depth    = 8,
 127                 .reg      = EM28XX_OUTFMT_RGB_8_GBGB,
 128         }, {
 129                 .fourcc   = V4L2_PIX_FMT_YUV411P,
 130                 .depth    = 12,
 131                 .reg      = EM28XX_OUTFMT_YUV411,
 132         },
 133 };
 134
 135 /*FIXME: maxw should be dependent of alt mode */
 136 static inline unsigned int norm_maxw(struct em28xx *dev)
 137 {
 138         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 139
 140         if (dev->is_webcam)
 141                 return v4l2->sensor_xres;
 142
 143         if (dev->board.max_range_640_480)
 144                 return 640;
 145
 146         return 720;
 147 }
 148
 149 static inline unsigned int norm_maxh(struct em28xx *dev)
 150 {
 151         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 152
 153         if (dev->is_webcam)
 154                 return v4l2->sensor_yres;
 155
 156         if (dev->board.max_range_640_480)
 157                 return 480;
 158
 159         return (v4l2->norm & V4L2_STD_625_50) ? 576 : 480;
 160 }
 161
 162 static int em28xx_vbi_supported(struct em28xx *dev)
 163 {
 164         /* Modprobe option to manually disable */
 165         if (disable_vbi == 1)
 166                 return 0;
 167
 168         if (dev->is_webcam)
 169                 return 0;
 170
 171         /* FIXME: check subdevices for VBI support */
 172
 173         if (dev->chip_id == CHIP_ID_EM2860 ||
 174             dev->chip_id == CHIP_ID_EM2883)
 175                 return 1;
 176
 177         /* Version of em28xx that does not support VBI */
 178         return 0;
 179 }
 180
 181 /*
 182  * em28xx_wake_i2c()
 183  * configure i2c attached devices
 184  */
 185 static void em28xx_wake_i2c(struct em28xx *dev)
 186 {
 187         struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
 188
 189         v4l2_device_call_all(v4l2_dev, 0, core,  reset, 0);
 190         v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
 191                              INPUT(dev->ctl_input)->vmux, 0, 0);
 192 }
 193
 194 static int em28xx_colorlevels_set_default(struct em28xx *dev)
 195 {
 196         em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
 197         em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
 198         em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
 199         em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
 200         em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
 201         em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);
 202
 203         em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
 204         em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
 205         em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
 206         em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
 207         em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
 208         em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
 209         return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
 210 }
 211
 212 static int em28xx_set_outfmt(struct em28xx *dev)
 213 {
 214         int ret;
 215         u8 fmt, vinctrl;
 216         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 217
 218         fmt = v4l2->format->reg;
 219         if (!dev->is_em25xx)
 220                 fmt |= 0x20;
 221         /*
 222          * NOTE: it's not clear if this is really needed !
 223          * The datasheets say bit 5 is a reserved bit and devices seem to work
 224          * fine without it. But the Windows driver sets it for em2710/50+em28xx
 225          * devices and we've always been setting it, too.
 226          *
 227          * em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
 228          * it's likely used for an additional (compressed ?) format there.
 229          */
 230         ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
 231         if (ret < 0)
 232                 return ret;
 233
 234         ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, v4l2->vinmode);
 235         if (ret < 0)
 236                 return ret;
 237
 238         vinctrl = v4l2->vinctl;
 239         if (em28xx_vbi_supported(dev) == 1) {
 240                 vinctrl |= EM28XX_VINCTRL_VBI_RAW;
 241                 em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
 242                 em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH,
 243                                  v4l2->vbi_width / 4);
 244                 em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, v4l2->vbi_height);
 245                 if (v4l2->norm & V4L2_STD_525_60) {
 246                         /* NTSC */
 247                         em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
 248                 } else if (v4l2->norm & V4L2_STD_625_50) {
 249                         /* PAL */
 250                         em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
 251                 }
 252         }
 253
 254         return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
 255 }
 256
 257 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
 258                                   u8 ymin, u8 ymax)
 259 {
 260         em28xx_videodbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
 261                         xmin, ymin, xmax, ymax);
 262
 263         em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
 264         em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
 265         em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
 266         return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
 267 }
 268
 269 static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
 270                                     u16 width, u16 height)
 271 {
 272         u8 cwidth = width >> 2;
 273         u8 cheight = height >> 2;
 274         u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
 275         /* NOTE: size limit: 2047x1023 = 2MPix */
 276
 277         em28xx_videodbg("capture area set to (%d,%d): %dx%d\n",
 278                         hstart, vstart,
 279                        ((overflow & 2) << 9 | cwidth << 2),
 280                        ((overflow & 1) << 10 | cheight << 2));
 281
 282         em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
 283         em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
 284         em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
 285         em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
 286         em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
 287
 288         /* FIXME: function/meaning of these registers ? */
 289         /* FIXME: align width+height to multiples of 4 ?! */
 290         if (dev->is_em25xx) {
 291                 em28xx_write_reg(dev, 0x34, width >> 4);
 292                 em28xx_write_reg(dev, 0x35, height >> 4);
 293         }
 294 }
 295
 296 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
 297 {
 298         u8 mode = 0x00;
 299         /* the em2800 scaler only supports scaling down to 50% */
 300
 301         if (dev->board.is_em2800) {
 302                 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
 303         } else {
 304                 u8 buf[2];
 305
 306                 buf[0] = h;
 307                 buf[1] = h >> 8;
 308                 em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
 309
 310                 buf[0] = v;
 311                 buf[1] = v >> 8;
 312                 em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
 313                 /*
 314                  * it seems that both H and V scalers must be active
 315                  * to work correctly
 316                  */
 317                 mode = (h || v) ? 0x30 : 0x00;
 318         }
 319         return em28xx_write_reg(dev, EM28XX_R26_COMPR, mode);
 320 }
 321
 322 /* FIXME: this only function read values from dev */
 323 static int em28xx_resolution_set(struct em28xx *dev)
 324 {
 325         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 326         int width = norm_maxw(dev);
 327         int height = norm_maxh(dev);
 328
 329         /* Properly setup VBI */
 330         v4l2->vbi_width = 720;
 331         if (v4l2->norm & V4L2_STD_525_60)
 332                 v4l2->vbi_height = 12;
 333         else
 334                 v4l2->vbi_height = 18;
 335
 336         em28xx_set_outfmt(dev);
 337
 338         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
 339
 340         /*
 341          * If we don't set the start position to 2 in VBI mode, we end up
 342          * with line 20/21 being YUYV encoded instead of being in 8-bit
 343          * greyscale.  The core of the issue is that line 21 (and line 23 for
 344          * PAL WSS) are inside of active video region, and as a result they
 345          * get the pixelformatting associated with that area.  So by cropping
 346          * it out, we end up with the same format as the rest of the VBI
 347          * region
 348          */
 349         if (em28xx_vbi_supported(dev) == 1)
 350                 em28xx_capture_area_set(dev, 0, 2, width, height);
 351         else
 352                 em28xx_capture_area_set(dev, 0, 0, width, height);
 353
 354         return em28xx_scaler_set(dev, v4l2->hscale, v4l2->vscale);
 355 }
 356
 357 /* Set USB alternate setting for analog video */
 358 static int em28xx_set_alternate(struct em28xx *dev)
 359 {
 360         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 361         struct usb_device *udev = interface_to_usbdev(dev->intf);
 362         int err;
 363         int i;
 364         unsigned int min_pkt_size = v4l2->width * 2 + 4;
 365
 366         /*
 367          * NOTE: for isoc transfers, only alt settings > 0 are allowed
 368          * bulk transfers seem to work only with alt=0 !
 369          */
 370         dev->alt = 0;
 371         if (alt > 0 && alt < dev->num_alt) {
 372                 em28xx_videodbg("alternate forced to %d\n", dev->alt);
 373                 dev->alt = alt;
 374                 goto set_alt;
 375         }
 376         if (dev->analog_xfer_bulk)
 377                 goto set_alt;
 378
 379         /*
 380          * When image size is bigger than a certain value,
 381          * the frame size should be increased, otherwise, only
 382          * green screen will be received.
 383          */
 384         if (v4l2->width * 2 * v4l2->height > 720 * 240 * 2)
 385                 min_pkt_size *= 2;
 386
 387         for (i = 0; i < dev->num_alt; i++) {
 388                 /* stop when the selected alt setting offers enough bandwidth */
 389                 if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
 390                         dev->alt = i;
 391                         break;
 392                 /*
 393                  * otherwise make sure that we end up with the maximum
 394                  * bandwidth because the min_pkt_size equation might be wrong.
 395                  *
 396                  */
 397                 } else if (dev->alt_max_pkt_size_isoc[i] >
 398                            dev->alt_max_pkt_size_isoc[dev->alt])
 399                         dev->alt = i;
 400         }
 401
 402 set_alt:
 403         /*
 404          * NOTE: for bulk transfers, we need to call usb_set_interface()
 405          * even if the previous settings were the same. Otherwise streaming
 406          * fails with all urbs having status = -EOVERFLOW !
 407          */
 408         if (dev->analog_xfer_bulk) {
 409                 dev->max_pkt_size = 512; /* USB 2.0 spec */
 410                 dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
 411         } else { /* isoc */
 412                 em28xx_videodbg("minimum isoc packet size: %u (alt=%d)\n",
 413                                 min_pkt_size, dev->alt);
 414                 dev->max_pkt_size =
 415                                   dev->alt_max_pkt_size_isoc[dev->alt];
 416                 dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
 417         }
 418         em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
 419                         dev->alt, dev->max_pkt_size);
 420         err = usb_set_interface(udev, dev->ifnum, dev->alt);
 421         if (err < 0) {
 422                 dev_err(&dev->intf->dev,
 423                         "cannot change alternate number to %d (error=%i)\n",
 424                         dev->alt, err);
 425                 return err;
 426         }
 427         return 0;
 428 }
 429
 430 /*
 431  * DMA and thread functions
 432  */
 433
 434 /*
 435  * Finish the current buffer
 436  */
 437 static inline void finish_buffer(struct em28xx *dev,
 438                                  struct em28xx_buffer *buf)
 439 {
 440         em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
 441
 442         buf->vb.sequence = dev->v4l2->field_count++;
 443         if (dev->v4l2->progressive)
 444                 buf->vb.field = V4L2_FIELD_NONE;
 445         else
 446                 buf->vb.field = V4L2_FIELD_INTERLACED;
 447         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 448
 449         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 450 }
 451
 452 /*
 453  * Copy picture data from USB buffer to videobuf buffer
 454  */
 455 static void em28xx_copy_video(struct em28xx *dev,
 456                               struct em28xx_buffer *buf,
 457                               unsigned char *usb_buf,
 458                               unsigned long len)
 459 {
 460         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 461         void *fieldstart, *startwrite, *startread;
 462         int  linesdone, currlinedone, offset, lencopy, remain;
 463         int bytesperline = v4l2->width << 1;
 464
 465         if (buf->pos + len > buf->length)
 466                 len = buf->length - buf->pos;
 467
 468         startread = usb_buf;
 469         remain = len;
 470
 471         if (v4l2->progressive || buf->top_field)
 472                 fieldstart = buf->vb_buf;
 473         else /* interlaced mode, even nr. of lines */
 474                 fieldstart = buf->vb_buf + bytesperline;
 475
 476         linesdone = buf->pos / bytesperline;
 477         currlinedone = buf->pos % bytesperline;
 478
 479         if (v4l2->progressive)
 480                 offset = linesdone * bytesperline + currlinedone;
 481         else
 482                 offset = linesdone * bytesperline * 2 + currlinedone;
 483
 484         startwrite = fieldstart + offset;
 485         lencopy = bytesperline - currlinedone;
 486         lencopy = lencopy > remain ? remain : lencopy;
 487
 488         if ((char *)startwrite + lencopy > (char *)buf->vb_buf + buf->length) {
 489                 em28xx_isocdbg("Overflow of %zu bytes past buffer end (1)\n",
 490                                ((char *)startwrite + lencopy) -
 491                               ((char *)buf->vb_buf + buf->length));
 492                 remain = (char *)buf->vb_buf + buf->length -
 493                          (char *)startwrite;
 494                 lencopy = remain;
 495         }
 496         if (lencopy <= 0)
 497                 return;
 498         memcpy(startwrite, startread, lencopy);
 499
 500         remain -= lencopy;
 501
 502         while (remain > 0) {
 503                 if (v4l2->progressive)
 504                         startwrite += lencopy;
 505                 else
 506                         startwrite += lencopy + bytesperline;
 507                 startread += lencopy;
 508                 if (bytesperline > remain)
 509                         lencopy = remain;
 510                 else
 511                         lencopy = bytesperline;
 512
 513                 if ((char *)startwrite + lencopy > (char *)buf->vb_buf +
 514                     buf->length) {
 515                         em28xx_isocdbg("Overflow of %zu bytes past buffer end(2)\n",
 516                                        ((char *)startwrite + lencopy) -
 517                                        ((char *)buf->vb_buf + buf->length));
 518                         remain = (char *)buf->vb_buf + buf->length -
 519                                  (char *)startwrite;
 520                         lencopy = remain;
 521                 }
 522                 if (lencopy <= 0)
 523                         break;
 524
 525                 memcpy(startwrite, startread, lencopy);
 526
 527                 remain -= lencopy;
 528         }
 529
 530         buf->pos += len;
 531 }
 532
 533 /*
 534  * Copy VBI data from USB buffer to videobuf buffer
 535  */
 536 static void em28xx_copy_vbi(struct em28xx *dev,
 537                             struct em28xx_buffer *buf,
 538                             unsigned char *usb_buf,
 539                             unsigned long len)
 540 {
 541         unsigned int offset;
 542
 543         if (buf->pos + len > buf->length)
 544                 len = buf->length - buf->pos;
 545
 546         offset = buf->pos;
 547         /* Make sure the bottom field populates the second half of the frame */
 548         if (buf->top_field == 0)
 549                 offset += dev->v4l2->vbi_width * dev->v4l2->vbi_height;
 550
 551         memcpy(buf->vb_buf + offset, usb_buf, len);
 552         buf->pos += len;
 553 }
 554
 555 static inline void print_err_status(struct em28xx *dev,
 556                                     int packet, int status)
 557 {
 558         char *errmsg = "Unknown";
 559
 560         switch (status) {
 561         case -ENOENT:
 562                 errmsg = "unlinked synchronously";
 563                 break;
 564         case -ECONNRESET:
 565                 errmsg = "unlinked asynchronously";
 566                 break;
 567         case -ENOSR:
 568                 errmsg = "Buffer error (overrun)";
 569                 break;
 570         case -EPIPE:
 571                 errmsg = "Stalled (device not responding)";
 572                 break;
 573         case -EOVERFLOW:
 574                 errmsg = "Babble (bad cable?)";
 575                 break;
 576         case -EPROTO:
 577                 errmsg = "Bit-stuff error (bad cable?)";
 578                 break;
 579         case -EILSEQ:
 580                 errmsg = "CRC/Timeout (could be anything)";
 581                 break;
 582         case -ETIME:
 583                 errmsg = "Device does not respond";
 584                 break;
 585         }
 586         if (packet < 0) {
 587                 em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
 588         } else {
 589                 em28xx_isocdbg("URB packet %d, status %d [%s].\n",
 590                                packet, status, errmsg);
 591         }
 592 }
 593
 594 /*
 595  * get the next available buffer from dma queue
 596  */
 597 static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
 598                                                  struct em28xx_dmaqueue *dma_q)
 599 {
 600         struct em28xx_buffer *buf;
 601
 602         if (list_empty(&dma_q->active)) {
 603                 em28xx_isocdbg("No active queue to serve\n");
 604                 return NULL;
 605         }
 606
 607         /* Get the next buffer */
 608         buf = list_entry(dma_q->active.next, struct em28xx_buffer, list);
 609         /* Cleans up buffer - Useful for testing for frame/URB loss */
 610         list_del(&buf->list);
 611         buf->pos = 0;
 612         buf->vb_buf = buf->mem;
 613
 614         return buf;
 615 }
 616
 617 /*
 618  * Finish the current buffer if completed and prepare for the next field
 619  */
 620 static struct em28xx_buffer *
 621 finish_field_prepare_next(struct em28xx *dev,
 622                           struct em28xx_buffer *buf,
 623                           struct em28xx_dmaqueue *dma_q)
 624 {
 625         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 626
 627         if (v4l2->progressive || v4l2->top_field) { /* Brand new frame */
 628                 if (buf)
 629                         finish_buffer(dev, buf);
 630                 buf = get_next_buf(dev, dma_q);
 631         }
 632         if (buf) {
 633                 buf->top_field = v4l2->top_field;
 634                 buf->pos = 0;
 635         }
 636
 637         return buf;
 638 }
 639
 640 /*
 641  * Process data packet according to the em2710/em2750/em28xx frame data format
 642  */
 643 static inline void process_frame_data_em28xx(struct em28xx *dev,
 644                                              unsigned char *data_pkt,
 645                                              unsigned int  data_len)
 646 {
 647         struct em28xx_v4l2      *v4l2 = dev->v4l2;
 648         struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
 649         struct em28xx_buffer    *vbi_buf = dev->usb_ctl.vbi_buf;
 650         struct em28xx_dmaqueue  *dma_q = &dev->vidq;
 651         struct em28xx_dmaqueue  *vbi_dma_q = &dev->vbiq;
 652
 653         /*
 654          * capture type 0 = vbi start
 655          * capture type 1 = vbi in progress
 656          * capture type 2 = video start
 657          * capture type 3 = video in progress
 658          */
 659         if (data_len >= 4) {
 660                 /*
 661                  * NOTE: Headers are always 4 bytes and
 662                  * never split across packets
 663                  */
 664                 if (data_pkt[0] == 0x88 && data_pkt[1] == 0x88 &&
 665                     data_pkt[2] == 0x88 && data_pkt[3] == 0x88) {
 666                         /* Continuation */
 667                         data_pkt += 4;
 668                         data_len -= 4;
 669                 } else if (data_pkt[0] == 0x33 && data_pkt[1] == 0x95) {
 670                         /* Field start (VBI mode) */
 671                         v4l2->capture_type = 0;
 672                         v4l2->vbi_read = 0;
 673                         em28xx_isocdbg("VBI START HEADER !!!\n");
 674                         v4l2->top_field = !(data_pkt[2] & 1);
 675                         data_pkt += 4;
 676                         data_len -= 4;
 677                 } else if (data_pkt[0] == 0x22 && data_pkt[1] == 0x5a) {
 678                         /* Field start (VBI disabled) */
 679                         v4l2->capture_type = 2;
 680                         em28xx_isocdbg("VIDEO START HEADER !!!\n");
 681                         v4l2->top_field = !(data_pkt[2] & 1);
 682                         data_pkt += 4;
 683                         data_len -= 4;
 684                 }
 685         }
 686         /*
 687          * NOTE: With bulk transfers, intermediate data packets
 688          * have no continuation header
 689          */
 690
 691         if (v4l2->capture_type == 0) {
 692                 vbi_buf = finish_field_prepare_next(dev, vbi_buf, vbi_dma_q);
 693                 dev->usb_ctl.vbi_buf = vbi_buf;
 694                 v4l2->capture_type = 1;
 695         }
 696
 697         if (v4l2->capture_type == 1) {
 698                 int vbi_size = v4l2->vbi_width * v4l2->vbi_height;
 699                 int vbi_data_len = ((v4l2->vbi_read + data_len) > vbi_size) ?
 700                                    (vbi_size - v4l2->vbi_read) : data_len;
 701
 702                 /* Copy VBI data */
 703                 if (vbi_buf)
 704                         em28xx_copy_vbi(dev, vbi_buf, data_pkt, vbi_data_len);
 705                 v4l2->vbi_read += vbi_data_len;
 706
 707                 if (vbi_data_len < data_len) {
 708                         /* Continue with copying video data */
 709                         v4l2->capture_type = 2;
 710                         data_pkt += vbi_data_len;
 711                         data_len -= vbi_data_len;
 712                 }
 713         }
 714
 715         if (v4l2->capture_type == 2) {
 716                 buf = finish_field_prepare_next(dev, buf, dma_q);
 717                 dev->usb_ctl.vid_buf = buf;
 718                 v4l2->capture_type = 3;
 719         }
 720
 721         if (v4l2->capture_type == 3 && buf && data_len > 0)
 722                 em28xx_copy_video(dev, buf, data_pkt, data_len);
 723 }
 724
 725 /*
 726  * Process data packet according to the em25xx/em276x/7x/8x frame data format
 727  */
 728 static inline void process_frame_data_em25xx(struct em28xx *dev,
 729                                              unsigned char *data_pkt,
 730                                              unsigned int  data_len)
 731 {
 732         struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
 733         struct em28xx_dmaqueue  *dmaq = &dev->vidq;
 734         struct em28xx_v4l2      *v4l2 = dev->v4l2;
 735         bool frame_end = false;
 736
 737         /* Check for header */
 738         /*
 739          * NOTE: at least with bulk transfers, only the first packet
 740          * has a header and has always set the FRAME_END bit
 741          */
 742         if (data_len >= 2) {    /* em25xx header is only 2 bytes long */
 743                 if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
 744                     ((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
 745                         v4l2->top_field = !(data_pkt[1] &
 746                                            EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
 747                         frame_end = data_pkt[1] &
 748                                     EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
 749                         data_pkt += 2;
 750                         data_len -= 2;
 751                 }
 752
 753                 /* Finish field and prepare next (BULK only) */
 754                 if (dev->analog_xfer_bulk && frame_end) {
 755                         buf = finish_field_prepare_next(dev, buf, dmaq);
 756                         dev->usb_ctl.vid_buf = buf;
 757                 }
 758                 /*
 759                  * NOTE: in ISOC mode when a new frame starts and buf==NULL,
 760                  * we COULD already prepare a buffer here to avoid skipping the
 761                  * first frame.
 762                  */
 763         }
 764
 765         /* Copy data */
 766         if (buf && data_len > 0)
 767                 em28xx_copy_video(dev, buf, data_pkt, data_len);
 768
 769         /* Finish frame (ISOC only) => avoids lag of 1 frame */
 770         if (!dev->analog_xfer_bulk && frame_end) {
 771                 buf = finish_field_prepare_next(dev, buf, dmaq);
 772                 dev->usb_ctl.vid_buf = buf;
 773         }
 774
 775         /*
 776          * NOTES:
 777          *
 778          * 1) Tested with USB bulk transfers only !
 779          * The wording in the datasheet suggests that isoc might work different.
 780          * The current code assumes that with isoc transfers each packet has a
 781          * header like with the other em28xx devices.
 782          *
 783          * 2) Support for interlaced mode is pure theory. It has not been
 784          * tested and it is unknown if these devices actually support it.
 785          */
 786 }
 787
 788 /* Processes and copies the URB data content (video and VBI data) */
 789 static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
 790 {
 791         int xfer_bulk, num_packets, i;
 792         unsigned char *usb_data_pkt;
 793         unsigned int usb_data_len;
 794
 795         if (!dev)
 796                 return 0;
 797
 798         if (dev->disconnected)
 799                 return 0;
 800
 801         if (urb->status < 0)
 802                 print_err_status(dev, -1, urb->status);
 803
 804         xfer_bulk = usb_pipebulk(urb->pipe);
 805
 806         if (xfer_bulk) /* bulk */
 807                 num_packets = 1;
 808         else /* isoc */
 809                 num_packets = urb->number_of_packets;
 810
 811         for (i = 0; i < num_packets; i++) {
 812                 if (xfer_bulk) { /* bulk */
 813                         usb_data_len = urb->actual_length;
 814
 815                         usb_data_pkt = urb->transfer_buffer;
 816                 } else { /* isoc */
 817                         if (urb->iso_frame_desc[i].status < 0) {
 818                                 print_err_status(dev, i,
 819                                                  urb->iso_frame_desc[i].status);
 820                                 if (urb->iso_frame_desc[i].status != -EPROTO)
 821                                         continue;
 822                         }
 823
 824                         usb_data_len = urb->iso_frame_desc[i].actual_length;
 825                         if (usb_data_len > dev->max_pkt_size) {
 826                                 em28xx_isocdbg("packet bigger than packet size");
 827                                 continue;
 828                         }
 829
 830                         usb_data_pkt = urb->transfer_buffer +
 831                                        urb->iso_frame_desc[i].offset;
 832                 }
 833
 834                 if (usb_data_len == 0) {
 835                         /* NOTE: happens very often with isoc transfers */
 836                         /* em28xx_usbdbg("packet %d is empty",i); - spammy */
 837                         continue;
 838                 }
 839
 840                 if (dev->is_em25xx)
 841                         process_frame_data_em25xx(dev,
 842                                                   usb_data_pkt, usb_data_len);
 843                 else
 844                         process_frame_data_em28xx(dev,
 845                                                   usb_data_pkt, usb_data_len);
 846         }
 847         return 1;
 848 }
 849
 850 static int get_resource(enum v4l2_buf_type f_type)
 851 {
 852         switch (f_type) {
 853         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 854                 return EM28XX_RESOURCE_VIDEO;
 855         case V4L2_BUF_TYPE_VBI_CAPTURE:
 856                 return EM28XX_RESOURCE_VBI;
 857         default:
 858                 WARN_ON(1);
 859                 return -1; /* Indicate that device is busy */
 860         }
 861 }
 862
 863 /* Usage lock check functions */
 864 static int res_get(struct em28xx *dev, enum v4l2_buf_type f_type)
 865 {
 866         int res_type = get_resource(f_type);
 867
 868         /* is it free? */
 869         if (dev->resources & res_type) {
 870                 /* no, someone else uses it */
 871                 return -EBUSY;
 872         }
 873
 874         /* it's free, grab it */
 875         dev->resources |= res_type;
 876         em28xx_videodbg("res: get %d\n", res_type);
 877         return 0;
 878 }
 879
 880 static void res_free(struct em28xx *dev, enum v4l2_buf_type f_type)
 881 {
 882         int res_type = get_resource(f_type);
 883
 884         dev->resources &= ~res_type;
 885         em28xx_videodbg("res: put %d\n", res_type);
 886 }
 887
 888 static void em28xx_v4l2_media_release(struct em28xx *dev)
 889 {
 890 #ifdef CONFIG_MEDIA_CONTROLLER
 891         int i;
 892
 893         for (i = 0; i < MAX_EM28XX_INPUT; i++) {
 894                 if (!INPUT(i)->type)
 895                         return;
 896                 media_device_unregister_entity(&dev->input_ent[i]);
 897         }
 898 #endif
 899 }
 900
 901 /*
 902  * Media Controller helper functions
 903  */
 904
 905 static int em28xx_enable_analog_tuner(struct em28xx *dev)
 906 {
 907 #ifdef CONFIG_MEDIA_CONTROLLER
 908         struct media_device *mdev = dev->media_dev;
 909         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 910         struct media_entity *source;
 911         struct media_link *link, *found_link = NULL;
 912         int ret, active_links = 0;
 913
 914         if (!mdev || !v4l2->decoder)
 915                 return 0;
 916
 917         /*
 918          * This will find the tuner that is connected into the decoder.
 919          * Technically, this is not 100% correct, as the device may be
 920          * using an analog input instead of the tuner. However, as we can't
 921          * do DVB streaming while the DMA engine is being used for V4L2,
 922          * this should be enough for the actual needs.
 923          */
 924         list_for_each_entry(link, &v4l2->decoder->links, list) {
 925                 if (link->sink->entity == v4l2->decoder) {
 926                         found_link = link;
 927                         if (link->flags & MEDIA_LNK_FL_ENABLED)
 928                                 active_links++;
 929                         break;
 930                 }
 931         }
 932
 933         if (active_links == 1 || !found_link)
 934                 return 0;
 935
 936         source = found_link->source->entity;
 937         list_for_each_entry(link, &source->links, list) {
 938                 struct media_entity *sink;
 939                 int flags = 0;
 940
 941                 sink = link->sink->entity;
 942
 943                 if (sink == v4l2->decoder)
 944                         flags = MEDIA_LNK_FL_ENABLED;
 945
 946                 ret = media_entity_setup_link(link, flags);
 947                 if (ret) {
 948                         dev_err(&dev->intf->dev,
 949                                 "Couldn't change link %s->%s to %s. Error %d\n",
 950                                 source->name, sink->name,
 951                                 flags ? "enabled" : "disabled",
 952                                 ret);
 953                         return ret;
 954                 }
 955
 956                 em28xx_videodbg("link %s->%s was %s\n",
 957                                 source->name, sink->name,
 958                                 flags ? "ENABLED" : "disabled");
 959         }
 960 #endif
 961         return 0;
 962 }
 963
 964 static const char * const iname[] = {
 965         [EM28XX_VMUX_COMPOSITE]  = "Composite",
 966         [EM28XX_VMUX_SVIDEO]     = "S-Video",
 967         [EM28XX_VMUX_TELEVISION] = "Television",
 968         [EM28XX_RADIO]           = "Radio",
 969 };
 970
 971 static void em28xx_v4l2_create_entities(struct em28xx *dev)
 972 {
 973 #if defined(CONFIG_MEDIA_CONTROLLER)
 974         struct em28xx_v4l2 *v4l2 = dev->v4l2;
 975         int ret, i;
 976
 977         /* Initialize Video, VBI and Radio pads */
 978         v4l2->video_pad.flags = MEDIA_PAD_FL_SINK;
 979         ret = media_entity_pads_init(&v4l2->vdev.entity, 1, &v4l2->video_pad);
 980         if (ret < 0)
 981                 dev_err(&dev->intf->dev,
 982                         "failed to initialize video media entity!\n");
 983
 984         if (em28xx_vbi_supported(dev)) {
 985                 v4l2->vbi_pad.flags = MEDIA_PAD_FL_SINK;
 986                 ret = media_entity_pads_init(&v4l2->vbi_dev.entity, 1,
 987                                              &v4l2->vbi_pad);
 988                 if (ret < 0)
 989                         dev_err(&dev->intf->dev,
 990                                 "failed to initialize vbi media entity!\n");
 991         }
 992
 993         /* Webcams don't have input connectors */
 994         if (dev->is_webcam)
 995                 return;
 996
 997         /* Create entities for each input connector */
 998         for (i = 0; i < MAX_EM28XX_INPUT; i++) {
 999                 struct media_entity *ent = &dev->input_ent[i];
1000
1001                 if (!INPUT(i)->type)
1002                         break;
1003
1004                 ent->name = iname[INPUT(i)->type];
1005                 ent->flags = MEDIA_ENT_FL_CONNECTOR;
1006                 dev->input_pad[i].flags = MEDIA_PAD_FL_SOURCE;
1007
1008                 switch (INPUT(i)->type) {
1009                 case EM28XX_VMUX_COMPOSITE:
1010                         ent->function = MEDIA_ENT_F_CONN_COMPOSITE;
1011                         break;
1012                 case EM28XX_VMUX_SVIDEO:
1013                         ent->function = MEDIA_ENT_F_CONN_SVIDEO;
1014                         break;
1015                 default: /* EM28XX_VMUX_TELEVISION or EM28XX_RADIO */
1016                         if (dev->tuner_type != TUNER_ABSENT)
1017                                 ent->function = MEDIA_ENT_F_CONN_RF;
1018                         break;
1019                 }
1020
1021                 ret = media_entity_pads_init(ent, 1, &dev->input_pad[i]);
1022                 if (ret < 0)
1023                         dev_err(&dev->intf->dev,
1024                                 "failed to initialize input pad[%d]!\n", i);
1025
1026                 ret = media_device_register_entity(dev->media_dev, ent);
1027                 if (ret < 0)
1028                         dev_err(&dev->intf->dev,
1029                                 "failed to register input entity %d!\n", i);
1030         }
1031 #endif
1032 }
1033
1034 /*
1035  * Videobuf2 operations
1036  */
1037
1038 static int queue_setup(struct vb2_queue *vq,
1039                        unsigned int *nbuffers, unsigned int *nplanes,
1040                        unsigned int sizes[], struct device *alloc_devs[])
1041 {
1042         struct em28xx *dev = vb2_get_drv_priv(vq);
1043         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1044         unsigned long size =
1045                     (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
1046
1047         if (*nplanes)
1048                 return sizes[0] < size ? -EINVAL : 0;
1049         *nplanes = 1;
1050         sizes[0] = size;
1051
1052         em28xx_enable_analog_tuner(dev);
1053
1054         return 0;
1055 }
1056
1057 static int
1058 buffer_prepare(struct vb2_buffer *vb)
1059 {
1060         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1061         struct em28xx        *dev = vb2_get_drv_priv(vb->vb2_queue);
1062         struct em28xx_v4l2   *v4l2 = dev->v4l2;
1063         unsigned long size;
1064
1065         em28xx_videodbg("%s, field=%d\n", __func__, vbuf->field);
1066
1067         size = (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
1068
1069         if (vb2_plane_size(vb, 0) < size) {
1070                 em28xx_videodbg("%s data will not fit into plane (%lu < %lu)\n",
1071                                 __func__, vb2_plane_size(vb, 0), size);
1072                 return -EINVAL;
1073         }
1074         vb2_set_plane_payload(vb, 0, size);
1075
1076         return 0;
1077 }
1078
1079 int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
1080 {
1081         struct em28xx *dev = vb2_get_drv_priv(vq);
1082         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1083         struct v4l2_frequency f;
1084         struct v4l2_fh *owner;
1085         int rc = 0;
1086
1087         em28xx_videodbg("%s\n", __func__);
1088
1089         dev->v4l2->field_count = 0;
1090
1091         /*
1092          * Make sure streaming is not already in progress for this type
1093          * of filehandle (e.g. video, vbi)
1094          */
1095         rc = res_get(dev, vq->type);
1096         if (rc)
1097                 return rc;
1098
1099         if (v4l2->streaming_users == 0) {
1100                 /* First active streaming user, so allocate all the URBs */
1101
1102                 /* Allocate the USB bandwidth */
1103                 em28xx_set_alternate(dev);
1104
1105                 /*
1106                  * Needed, since GPIO might have disabled power of
1107                  * some i2c device
1108                  */
1109                 em28xx_wake_i2c(dev);
1110
1111                 v4l2->capture_type = -1;
1112                 rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE,
1113                                           dev->analog_xfer_bulk,
1114                                           EM28XX_NUM_BUFS,
1115                                           dev->max_pkt_size,
1116                                           dev->packet_multiplier,
1117                                           em28xx_urb_data_copy);
1118                 if (rc < 0)
1119                         return rc;
1120
1121                 /*
1122                  * djh: it's not clear whether this code is still needed.  I'm
1123                  * leaving it in here for now entirely out of concern for
1124                  * backward compatibility (the old code did it)
1125                  */
1126
1127                 /* Ask tuner to go to analog or radio mode */
1128                 memset(&f, 0, sizeof(f));
1129                 f.frequency = v4l2->frequency;
1130                 owner = (struct v4l2_fh *)vq->owner;
1131                 if (owner && owner->vdev->vfl_type == VFL_TYPE_RADIO)
1132                         f.type = V4L2_TUNER_RADIO;
1133                 else
1134                         f.type = V4L2_TUNER_ANALOG_TV;
1135                 v4l2_device_call_all(&v4l2->v4l2_dev,
1136                                      0, tuner, s_frequency, &f);
1137
1138                 /* Enable video stream at TV decoder */
1139                 v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 1);
1140         }
1141
1142         v4l2->streaming_users++;
1143
1144         return rc;
1145 }
1146
1147 static void em28xx_stop_streaming(struct vb2_queue *vq)
1148 {
1149         struct em28xx *dev = vb2_get_drv_priv(vq);
1150         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1151         struct em28xx_dmaqueue *vidq = &dev->vidq;
1152         unsigned long flags = 0;
1153
1154         em28xx_videodbg("%s\n", __func__);
1155
1156         res_free(dev, vq->type);
1157
1158         if (v4l2->streaming_users-- == 1) {
1159                 /* Disable video stream at TV decoder */
1160                 v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
1161
1162                 /* Last active user, so shutdown all the URBS */
1163                 em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
1164         }
1165
1166         spin_lock_irqsave(&dev->slock, flags);
1167         if (dev->usb_ctl.vid_buf) {
1168                 vb2_buffer_done(&dev->usb_ctl.vid_buf->vb.vb2_buf,
1169                                 VB2_BUF_STATE_ERROR);
1170                 dev->usb_ctl.vid_buf = NULL;
1171         }
1172         while (!list_empty(&vidq->active)) {
1173                 struct em28xx_buffer *buf;
1174
1175                 buf = list_entry(vidq->active.next, struct em28xx_buffer, list);
1176                 list_del(&buf->list);
1177                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
1178         }
1179         spin_unlock_irqrestore(&dev->slock, flags);
1180 }
1181
1182 void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
1183 {
1184         struct em28xx *dev = vb2_get_drv_priv(vq);
1185         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1186         struct em28xx_dmaqueue *vbiq = &dev->vbiq;
1187         unsigned long flags = 0;
1188
1189         em28xx_videodbg("%s\n", __func__);
1190
1191         res_free(dev, vq->type);
1192
1193         if (v4l2->streaming_users-- == 1) {
1194                 /* Disable video stream at TV decoder */
1195                 v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
1196
1197                 /* Last active user, so shutdown all the URBS */
1198                 em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
1199         }
1200
1201         spin_lock_irqsave(&dev->slock, flags);
1202         if (dev->usb_ctl.vbi_buf) {
1203                 vb2_buffer_done(&dev->usb_ctl.vbi_buf->vb.vb2_buf,
1204                                 VB2_BUF_STATE_ERROR);
1205                 dev->usb_ctl.vbi_buf = NULL;
1206         }
1207         while (!list_empty(&vbiq->active)) {
1208                 struct em28xx_buffer *buf;
1209
1210                 buf = list_entry(vbiq->active.next, struct em28xx_buffer, list);
1211                 list_del(&buf->list);
1212                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
1213         }
1214         spin_unlock_irqrestore(&dev->slock, flags);
1215 }
1216
1217 static void
1218 buffer_queue(struct vb2_buffer *vb)
1219 {
1220         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1221         struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
1222         struct em28xx_buffer *buf =
1223                 container_of(vbuf, struct em28xx_buffer, vb);
1224         struct em28xx_dmaqueue *vidq = &dev->vidq;
1225         unsigned long flags = 0;
1226
1227         em28xx_videodbg("%s\n", __func__);
1228         buf->mem = vb2_plane_vaddr(vb, 0);
1229         buf->length = vb2_plane_size(vb, 0);
1230
1231         spin_lock_irqsave(&dev->slock, flags);
1232         list_add_tail(&buf->list, &vidq->active);
1233         spin_unlock_irqrestore(&dev->slock, flags);
1234 }
1235
1236 static const struct vb2_ops em28xx_video_qops = {
1237         .queue_setup    = queue_setup,
1238         .buf_prepare    = buffer_prepare,
1239         .buf_queue      = buffer_queue,
1240         .start_streaming = em28xx_start_analog_streaming,
1241         .stop_streaming = em28xx_stop_streaming,
1242         .wait_prepare   = vb2_ops_wait_prepare,
1243         .wait_finish    = vb2_ops_wait_finish,
1244 };
1245
1246 static int em28xx_vb2_setup(struct em28xx *dev)
1247 {
1248         int rc;
1249         struct vb2_queue *q;
1250         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1251
1252         /* Setup Videobuf2 for Video capture */
1253         q = &v4l2->vb_vidq;
1254         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1255         q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1256         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1257         q->drv_priv = dev;
1258         q->buf_struct_size = sizeof(struct em28xx_buffer);
1259         q->ops = &em28xx_video_qops;
1260         q->mem_ops = &vb2_vmalloc_memops;
1261
1262         rc = vb2_queue_init(q);
1263         if (rc < 0)
1264                 return rc;
1265
1266         /* Setup Videobuf2 for VBI capture */
1267         q = &v4l2->vb_vbiq;
1268         q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1269         q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
1270         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1271         q->drv_priv = dev;
1272         q->buf_struct_size = sizeof(struct em28xx_buffer);
1273         q->ops = &em28xx_vbi_qops;
1274         q->mem_ops = &vb2_vmalloc_memops;
1275
1276         rc = vb2_queue_init(q);
1277         if (rc < 0)
1278                 return rc;
1279
1280         return 0;
1281 }
1282
1283 /*
1284  * v4l2 interface
1285  */
1286
1287 static void video_mux(struct em28xx *dev, int index)
1288 {
1289         struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
1290
1291         dev->ctl_input = index;
1292         dev->ctl_ainput = INPUT(index)->amux;
1293         dev->ctl_aoutput = INPUT(index)->aout;
1294
1295         if (!dev->ctl_aoutput)
1296                 dev->ctl_aoutput = EM28XX_AOUT_MASTER;
1297
1298         v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
1299                              INPUT(index)->vmux, 0, 0);
1300
1301         if (dev->has_msp34xx) {
1302                 if (dev->i2s_speed) {
1303                         v4l2_device_call_all(v4l2_dev, 0, audio,
1304                                              s_i2s_clock_freq, dev->i2s_speed);
1305                 }
1306                 /* Note: this is msp3400 specific */
1307                 v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
1308                                      dev->ctl_ainput,
1309                                      MSP_OUTPUT(MSP_SC_IN_DSP_SCART1), 0);
1310         }
1311
1312         if (dev->board.adecoder != EM28XX_NOADECODER) {
1313                 v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
1314                                      dev->ctl_ainput, dev->ctl_aoutput, 0);
1315         }
1316
1317         em28xx_audio_analog_set(dev);
1318 }
1319
1320 static void em28xx_ctrl_notify(struct v4l2_ctrl *ctrl, void *priv)
1321 {
1322         struct em28xx *dev = priv;
1323
1324         /*
1325          * In the case of non-AC97 volume controls, we still need
1326          * to do some setups at em28xx, in order to mute/unmute
1327          * and to adjust audio volume. However, the value ranges
1328          * should be checked by the corresponding V4L subdriver.
1329          */
1330         switch (ctrl->id) {
1331         case V4L2_CID_AUDIO_MUTE:
1332                 dev->mute = ctrl->val;
1333                 em28xx_audio_analog_set(dev);
1334                 break;
1335         case V4L2_CID_AUDIO_VOLUME:
1336                 dev->volume = ctrl->val;
1337                 em28xx_audio_analog_set(dev);
1338                 break;
1339         }
1340 }
1341
1342 static int em28xx_s_ctrl(struct v4l2_ctrl *ctrl)
1343 {
1344         struct em28xx_v4l2 *v4l2 =
1345                   container_of(ctrl->handler, struct em28xx_v4l2, ctrl_handler);
1346         struct em28xx *dev = v4l2->dev;
1347         int ret = -EINVAL;
1348
1349         switch (ctrl->id) {
1350         case V4L2_CID_AUDIO_MUTE:
1351                 dev->mute = ctrl->val;
1352                 ret = em28xx_audio_analog_set(dev);
1353                 break;
1354         case V4L2_CID_AUDIO_VOLUME:
1355                 dev->volume = ctrl->val;
1356                 ret = em28xx_audio_analog_set(dev);
1357                 break;
1358         case V4L2_CID_CONTRAST:
1359                 ret = em28xx_write_reg(dev, EM28XX_R20_YGAIN, ctrl->val);
1360                 break;
1361         case V4L2_CID_BRIGHTNESS:
1362                 ret = em28xx_write_reg(dev, EM28XX_R21_YOFFSET, ctrl->val);
1363                 break;
1364         case V4L2_CID_SATURATION:
1365                 ret = em28xx_write_reg(dev, EM28XX_R22_UVGAIN, ctrl->val);
1366                 break;
1367         case V4L2_CID_BLUE_BALANCE:
1368                 ret = em28xx_write_reg(dev, EM28XX_R23_UOFFSET, ctrl->val);
1369                 break;
1370         case V4L2_CID_RED_BALANCE:
1371                 ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
1372                 break;
1373         case V4L2_CID_SHARPNESS:
1374                 ret = em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, ctrl->val);
1375                 break;
1376         }
1377
1378         return (ret < 0) ? ret : 0;
1379 }
1380
1381 static const struct v4l2_ctrl_ops em28xx_ctrl_ops = {
1382         .s_ctrl = em28xx_s_ctrl,
1383 };
1384
1385 static void size_to_scale(struct em28xx *dev,
1386                           unsigned int width, unsigned int height,
1387                         unsigned int *hscale, unsigned int *vscale)
1388 {
1389         unsigned int          maxw = norm_maxw(dev);
1390         unsigned int          maxh = norm_maxh(dev);
1391
1392         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
1393         if (*hscale > EM28XX_HVSCALE_MAX)
1394                 *hscale = EM28XX_HVSCALE_MAX;
1395
1396         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
1397         if (*vscale > EM28XX_HVSCALE_MAX)
1398                 *vscale = EM28XX_HVSCALE_MAX;
1399 }
1400
1401 static void scale_to_size(struct em28xx *dev,
1402                           unsigned int hscale, unsigned int vscale,
1403                           unsigned int *width, unsigned int *height)
1404 {
1405         unsigned int          maxw = norm_maxw(dev);
1406         unsigned int          maxh = norm_maxh(dev);
1407
1408         *width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
1409         *height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
1410
1411         /* Don't let width or height to be zero */
1412         if (*width < 1)
1413                 *width = 1;
1414         if (*height < 1)
1415                 *height = 1;
1416 }
1417
1418 /*
1419  * IOCTL vidioc handling
1420  */
1421
1422 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1423                                 struct v4l2_format *f)
1424 {
1425         struct em28xx         *dev = video_drvdata(file);
1426         struct em28xx_v4l2    *v4l2 = dev->v4l2;
1427
1428         f->fmt.pix.width = v4l2->width;
1429         f->fmt.pix.height = v4l2->height;
1430         f->fmt.pix.pixelformat = v4l2->format->fourcc;
1431         f->fmt.pix.bytesperline = (v4l2->width * v4l2->format->depth + 7) >> 3;
1432         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * v4l2->height;
1433         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1434
1435         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
1436         if (v4l2->progressive)
1437                 f->fmt.pix.field = V4L2_FIELD_NONE;
1438         else
1439                 f->fmt.pix.field = v4l2->interlaced_fieldmode ?
1440                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
1441         return 0;
1442 }
1443
1444 static struct em28xx_fmt *format_by_fourcc(unsigned int fourcc)
1445 {
1446         unsigned int i;
1447
1448         for (i = 0; i < ARRAY_SIZE(format); i++)
1449                 if (format[i].fourcc == fourcc)
1450                         return &format[i];
1451
1452         return NULL;
1453 }
1454
1455 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
1456                                   struct v4l2_format *f)
1457 {
1458         struct em28xx         *dev   = video_drvdata(file);
1459         struct em28xx_v4l2    *v4l2  = dev->v4l2;
1460         unsigned int          width  = f->fmt.pix.width;
1461         unsigned int          height = f->fmt.pix.height;
1462         unsigned int          maxw   = norm_maxw(dev);
1463         unsigned int          maxh   = norm_maxh(dev);
1464         unsigned int          hscale, vscale;
1465         struct em28xx_fmt     *fmt;
1466
1467         fmt = format_by_fourcc(f->fmt.pix.pixelformat);
1468         if (!fmt) {
1469                 fmt = &format[0];
1470                 em28xx_videodbg("Fourcc format (%08x) invalid. Using default (%08x).\n",
1471                                 f->fmt.pix.pixelformat, fmt->fourcc);
1472         }
1473
1474         if (dev->board.is_em2800) {
1475                 /* the em2800 can only scale down to 50% */
1476                 height = height > (3 * maxh / 4) ? maxh : maxh / 2;
1477                 width = width > (3 * maxw / 4) ? maxw : maxw / 2;
1478                 /*
1479                  * MaxPacketSize for em2800 is too small to capture at full
1480                  * resolution use half of maxw as the scaler can only scale
1481                  * to 50%
1482                  */
1483                 if (width == maxw && height == maxh)
1484                         width /= 2;
1485         } else {
1486                 /*
1487                  * width must even because of the YUYV format
1488                  * height must be even because of interlacing
1489                  */
1490                 v4l_bound_align_image(&width, 48, maxw, 1, &height, 32, maxh,
1491                                       1, 0);
1492         }
1493         /* Avoid division by zero at size_to_scale */
1494         if (width < 1)
1495                 width = 1;
1496         if (height < 1)
1497                 height = 1;
1498
1499         size_to_scale(dev, width, height, &hscale, &vscale);
1500         scale_to_size(dev, hscale, vscale, &width, &height);
1501
1502         f->fmt.pix.width = width;
1503         f->fmt.pix.height = height;
1504         f->fmt.pix.pixelformat = fmt->fourcc;
1505         f->fmt.pix.bytesperline = (width * fmt->depth + 7) >> 3;
1506         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
1507         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1508         if (v4l2->progressive)
1509                 f->fmt.pix.field = V4L2_FIELD_NONE;
1510         else
1511                 f->fmt.pix.field = v4l2->interlaced_fieldmode ?
1512                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
1513
1514         return 0;
1515 }
1516
1517 static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
1518                                    unsigned int width, unsigned int height)
1519 {
1520         struct em28xx_fmt     *fmt;
1521         struct em28xx_v4l2    *v4l2 = dev->v4l2;
1522
1523         fmt = format_by_fourcc(fourcc);
1524         if (!fmt)
1525                 return -EINVAL;
1526
1527         v4l2->format = fmt;
1528         v4l2->width  = width;
1529         v4l2->height = height;
1530
1531         /* set new image size */
1532         size_to_scale(dev, v4l2->width, v4l2->height,
1533                       &v4l2->hscale, &v4l2->vscale);
1534
1535         em28xx_resolution_set(dev);
1536
1537         return 0;
1538 }
1539
1540 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1541                                 struct v4l2_format *f)
1542 {
1543         struct em28xx *dev = video_drvdata(file);
1544         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1545
1546         if (vb2_is_busy(&v4l2->vb_vidq))
1547                 return -EBUSY;
1548
1549         vidioc_try_fmt_vid_cap(file, priv, f);
1550
1551         return em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
1552                                 f->fmt.pix.width, f->fmt.pix.height);
1553 }
1554
1555 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
1556 {
1557         struct em28xx *dev = video_drvdata(file);
1558
1559         *norm = dev->v4l2->norm;
1560
1561         return 0;
1562 }
1563
1564 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
1565 {
1566         struct em28xx *dev = video_drvdata(file);
1567
1568         v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd, norm);
1569
1570         return 0;
1571 }
1572
1573 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
1574 {
1575         struct em28xx      *dev  = video_drvdata(file);
1576         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1577         struct v4l2_format f;
1578
1579         if (norm == v4l2->norm)
1580                 return 0;
1581
1582         if (v4l2->streaming_users > 0)
1583                 return -EBUSY;
1584
1585         v4l2->norm = norm;
1586
1587         /* Adjusts width/height, if needed */
1588         f.fmt.pix.width = 720;
1589         f.fmt.pix.height = (norm & V4L2_STD_525_60) ? 480 : 576;
1590         vidioc_try_fmt_vid_cap(file, priv, &f);
1591
1592         /* set new image size */
1593         v4l2->width = f.fmt.pix.width;
1594         v4l2->height = f.fmt.pix.height;
1595         size_to_scale(dev, v4l2->width, v4l2->height,
1596                       &v4l2->hscale, &v4l2->vscale);
1597
1598         em28xx_resolution_set(dev);
1599         v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
1600
1601         return 0;
1602 }
1603
1604 static int vidioc_g_parm(struct file *file, void *priv,
1605                          struct v4l2_streamparm *p)
1606 {
1607         struct v4l2_subdev_frame_interval ival = { 0 };
1608         struct em28xx      *dev  = video_drvdata(file);
1609         struct em28xx_v4l2 *v4l2 = dev->v4l2;
1610         int rc = 0;
1611
1612         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1613             p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1614                 return -EINVAL;
1615
1616         p->parm.capture.readbuffers = EM28XX_MIN_BUF;
1617         p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1618         if (dev->is_webcam) {
1619                 rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
1620                                                 video, g_frame_interval, &ival);
1621                 if (!rc)
1622                         p->parm.capture.timeperframe = ival.interval;
1623         } else {
1624                 v4l2_video_std_frame_period(v4l2->norm,
1625                                             &p->parm.capture.timeperframe);
1626         }
1627
1628         return rc;
1629 }
1630
1631 static int vidioc_s_parm(struct file *file, void *priv,
1632                          struct v4l2_streamparm *p)
1633 {
1634         struct em28xx *dev = video_drvdata(file);
1635         struct v4l2_subdev_frame_interval ival = {
1636                 0,
1637                 p->parm.capture.timeperframe
1638         };
1639         int rc = 0;
1640
1641         if (!dev->is_webcam)
1642                 return -ENOTTY;
1643
1644         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1645             p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1646                 return -EINVAL;
1647
1648         memset(&p->parm, 0, sizeof(p->parm));
1649         p->parm.capture.readbuffers = EM28XX_MIN_BUF;
1650         p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1651         rc = v4l2_device_call_until_err(&dev->v4l2->v4l2_dev, 0,
1652                                         video, s_frame_interval, &ival);
1653         if (!rc)
1654                 p->parm.capture.timeperframe = ival.interval;
1655         return rc;
1656 }
1657
1658 static int vidioc_enum_input(struct file *file, void *priv,
1659                              struct v4l2_input *i)
1660 {
1661         struct em28xx *dev = video_drvdata(file);
1662         unsigned int       n;
1663         int j;
1664
1665         n = i->index;
1666         if (n >= MAX_EM28XX_INPUT)
1667                 return -EINVAL;
1668         if (!INPUT(n)->type)
1669                 return -EINVAL;
1670
1671         i->type = V4L2_INPUT_TYPE_CAMERA;
1672
1673         strscpy(i->name, iname[INPUT(n)->type], sizeof(i->name));
1674
1675         if (INPUT(n)->type == EM28XX_VMUX_TELEVISION)
1676                 i->type = V4L2_INPUT_TYPE_TUNER;
1677
1678         i->std = dev->v4l2->vdev.tvnorms;
1679         /* webcams do not have the STD API */
1680         if (dev->is_webcam)
1681                 i->capabilities = 0;
1682
1683         /* Dynamically generates an audioset bitmask */
1684         i->audioset = 0;
1685         for (j = 0; j < MAX_EM28XX_INPUT; j++)
1686                 if (dev->amux_map[j] != EM28XX_AMUX_UNUSED)
1687                         i->audioset |= 1 << j;
1688
1689         return 0;
1690 }
1691
1692 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1693 {
1694         struct em28xx *dev = video_drvdata(file);
1695
1696         *i = dev->ctl_input;
1697
1698         return 0;
1699 }
1700
1701 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1702 {
1703         struct em28xx *dev = video_drvdata(file);
1704
1705         if (i >= MAX_EM28XX_INPUT)
1706                 return -EINVAL;
1707         if (!INPUT(i)->type)
1708                 return -EINVAL;
1709
1710         video_mux(dev, i);
1711         return 0;
1712 }
1713
1714 static int em28xx_fill_audio_input(struct em28xx *dev,
1715                                    const char *s,
1716                                    struct v4l2_audio *a,
1717                                    unsigned int index)
1718 {
1719         unsigned int idx = dev->amux_map[index];
1720
1721         /*
1722          * With msp3400, almost all mappings use the default (amux = 0).
1723          * The only one may use a different value is WinTV USB2, where it
1724          * can also be SCART1 input.
1725          * As it is very doubtful that we would see new boards with msp3400,
1726          * let's just reuse the existing switch.
1727          */
1728         if (dev->has_msp34xx && idx != EM28XX_AMUX_UNUSED)
1729                 idx = EM28XX_AMUX_LINE_IN;
1730
1731         switch (idx) {
1732         case EM28XX_AMUX_VIDEO:
1733                 strscpy(a->name, "Television", sizeof(a->name));
1734                 break;
1735         case EM28XX_AMUX_LINE_IN:
1736                 strscpy(a->name, "Line In", sizeof(a->name));
1737                 break;
1738         case EM28XX_AMUX_VIDEO2:
1739                 strscpy(a->name, "Television alt", sizeof(a->name));
1740                 break;
1741         case EM28XX_AMUX_PHONE:
1742                 strscpy(a->name, "Phone", sizeof(a->name));
1743                 break;
1744         case EM28XX_AMUX_MIC:
1745                 strscpy(a->name, "Mic", sizeof(a->name));
1746                 break;
1747         case EM28XX_AMUX_CD:
1748                 strscpy(a->name, "CD", sizeof(a->name));
1749                 break;
1750         case EM28XX_AMUX_AUX:
1751                 strscpy(a->name, "Aux", sizeof(a->name));
1752                 break;
1753         case EM28XX_AMUX_PCM_OUT:
1754                 strscpy(a->name, "PCM", sizeof(a->name));
1755                 break;
1756         case EM28XX_AMUX_UNUSED:
1757         default:
1758                 return -EINVAL;
1759         }
1760         a->index = index;
1761         a->capability = V4L2_AUDCAP_STEREO;
1762
1763         em28xx_videodbg("%s: audio input index %d is '%s'\n",
1764                         s, a->index, a->name);
1765
1766         return 0;
1767 }
1768
1769 static int vidioc_enumaudio(struct file *file, void *fh, struct v4l2_audio *a)
1770 {
1771         struct em28xx *dev = video_drvdata(file);
1772
1773         if (a->index >= MAX_EM28XX_INPUT)
1774                 return -EINVAL;
1775
1776         return em28xx_fill_audio_input(dev, __func__, a, a->index);
1777 }
1778
1779 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1780 {
1781         struct em28xx *dev = video_drvdata(file);
1782         int i;
1783
1784         for (i = 0; i < MAX_EM28XX_INPUT; i++)
1785                 if (dev->ctl_ainput == dev->amux_map[i])
1786                         return em28xx_fill_audio_input(dev, __func__, a, i);
1787
1788         /* Should never happen! */
1789         return -EINVAL;
1790 }
1791
1792 static int vidioc_s_audio(struct file *file, void *priv,
1793                           const struct v4l2_audio *a)
1794 {
1795         struct em28xx *dev = video_drvdata(file);
1796         int idx, i;
1797
1798         if (a->index >= MAX_EM28XX_INPUT)
1799                 return -EINVAL;
1800
1801         idx = dev->amux_map[a->index];
1802
1803         if (idx == EM28XX_AMUX_UNUSED)
1804                 return -EINVAL;
1805
1806         dev->ctl_ainput = idx;
1807
1808         /*
1809          * FIXME: This is wrong, as different inputs at em28xx_cards
1810          * may have different audio outputs. So, the right thing
1811          * to do is to implement VIDIOC_G_AUDOUT/VIDIOC_S_AUDOUT.
1812          * With the current board definitions, this would work fine,
1813          * as, currently, all boards fit.
1814          */
1815         for (i = 0; i < MAX_EM28XX_INPUT; i++)
1816                 if (idx == dev->amux_map[i])
1817                         break;
1818         if (i == MAX_EM28XX_INPUT)
1819                 return -EINVAL;
1820
1821         dev->ctl_aoutput = INPUT(i)->aout;
1822
1823         if (!dev->ctl_aoutput)
1824                 dev->ctl_aoutput = EM28XX_AOUT_MASTER;
1825
1826         em28xx_videodbg("%s: set audio input to %d\n", __func__,
1827                         dev->ctl_ainput);
1828
1829         return 0;
1830 }
1831
1832 static int vidioc_g_tuner(struct file *file, void *priv,
1833                           struct v4l2_tuner *t)
1834 {
1835         struct em28xx *dev = video_drvdata(file);
1836
1837         if (t->index != 0)
1838                 return -EINVAL;
1839
1840         strscpy(t->name, "Tuner", sizeof(t->name));
1841
1842         v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
1843         return 0;
1844 }
1845
1846 static int vidioc_s_tuner(struct file *file, void *priv,
1847                           const struct v4l2_tuner *t)
1848 {
1849         struct em28xx *dev = video_drvdata(file);
1850
1851         if (t->index != 0)
1852                 return -EINVAL;
1853
1854         v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
1855         return 0;
1856 }
1857
1858 static int vidioc_g_frequency(struct file *file, void *priv,
1859                               struct v4l2_frequency *f)
1860 {
1861         struct em28xx         *dev = video_drvdata(file);
1862         struct em28xx_v4l2    *v4l2 = dev->v4l2;
1863
1864         if (f->tuner != 0)
1865                 return -EINVAL;
1866
1867         f->frequency = v4l2->frequency;
1868         return 0;
1869 }
1870
1871 static int vidioc_s_frequency(struct file *file, void *priv,
1872                               const struct v4l2_frequency *f)
1873 {
1874         struct v4l2_frequency  new_freq = *f;
1875         struct em28xx             *dev  = video_drvdata(file);
1876         struct em28xx_v4l2        *v4l2 = dev->v4l2;
1877
1878         if (f->tuner != 0)
1879                 return -EINVAL;
1880
1881         v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
1882         v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency, &new_freq);
1883         v4l2->frequency = new_freq.frequency;
1884
1885         return 0;
1886 }
1887
1888 #ifdef CONFIG_VIDEO_ADV_DEBUG
1889 static int vidioc_g_chip_info(struct file *file, void *priv,
1890                               struct v4l2_dbg_chip_info *chip)
1891 {
1892         struct em28xx *dev = video_drvdata(file);
1893
1894         if (chip->match.addr > 1)
1895                 return -EINVAL;
1896         if (chip->match.addr == 1)
1897                 strscpy(chip->name, "ac97", sizeof(chip->name));
1898         else
1899                 strscpy(chip->name,
1900                         dev->v4l2->v4l2_dev.name, sizeof(chip->name));
1901         return 0;
1902 }
1903
1904 static int em28xx_reg_len(int reg)
1905 {
1906         switch (reg) {
1907         case EM28XX_R40_AC97LSB:
1908         case EM28XX_R30_HSCALELOW:
1909         case EM28XX_R32_VSCALELOW:
1910                 return 2;
1911         default:
1912                 return 1;
1913         }
1914 }
1915
1916 static int vidioc_g_register(struct file *file, void *priv,
1917                              struct v4l2_dbg_register *reg)
1918 {
1919         struct em28xx *dev = video_drvdata(file);
1920         int ret;
1921
1922         if (reg->match.addr > 1)
1923                 return -EINVAL;
1924         if (reg->match.addr) {
1925                 ret = em28xx_read_ac97(dev, reg->reg);
1926                 if (ret < 0)
1927                         return ret;
1928
1929                 reg->val = ret;
1930                 reg->size = 1;
1931                 return 0;
1932         }
1933
1934         /* Match host */
1935         reg->size = em28xx_reg_len(reg->reg);
1936         if (reg->size == 1) {
1937                 ret = em28xx_read_reg(dev, reg->reg);
1938
1939                 if (ret < 0)
1940                         return ret;
1941
1942                 reg->val = ret;
1943         } else {
1944                 __le16 val = 0;
1945
1946                 ret = dev->em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
1947                                                    reg->reg, (char *)&val, 2);
1948                 if (ret < 0)
1949                         return ret;
1950
1951                 reg->val = le16_to_cpu(val);
1952         }
1953
1954         return 0;
1955 }
1956
1957 static int vidioc_s_register(struct file *file, void *priv,
1958                              const struct v4l2_dbg_register *reg)
1959 {
1960         struct em28xx *dev = video_drvdata(file);
1961         __le16 buf;
1962
1963         if (reg->match.addr > 1)
1964                 return -EINVAL;
1965         if (reg->match.addr)
1966                 return em28xx_write_ac97(dev, reg->reg, reg->val);
1967
1968         /* Match host */
1969         buf = cpu_to_le16(reg->val);
1970
1971         return em28xx_write_regs(dev, reg->reg, (char *)&buf,
1972                                em28xx_reg_len(reg->reg));
1973 }
1974 #endif
1975
1976 static int vidioc_querycap(struct file *file, void  *priv,
1977                            struct v4l2_capability *cap)
1978 {
1979         struct em28xx         *dev  = video_drvdata(file);
1980         struct em28xx_v4l2    *v4l2 = dev->v4l2;
1981         struct usb_device *udev = interface_to_usbdev(dev->intf);
1982
1983         strscpy(cap->driver, "em28xx", sizeof(cap->driver));
1984         strscpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1985         usb_make_path(udev, cap->bus_info, sizeof(cap->bus_info));
1986
1987         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_READWRITE |
1988                             V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1989         if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
1990                 cap->capabilities |= V4L2_CAP_AUDIO;
1991         if (dev->tuner_type != TUNER_ABSENT)
1992                 cap->capabilities |= V4L2_CAP_TUNER;
1993         if (video_is_registered(&v4l2->vbi_dev))
1994                 cap->capabilities |= V4L2_CAP_VBI_CAPTURE;
1995         if (video_is_registered(&v4l2->radio_dev))
1996                 cap->capabilities |= V4L2_CAP_RADIO;
1997         return 0;
1998 }
1999
2000 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
2001                                    struct v4l2_fmtdesc *f)
2002 {
2003         if (unlikely(f->index >= ARRAY_SIZE(format)))
2004                 return -EINVAL;
2005
2006         f->pixelformat = format[f->index].fourcc;
2007
2008         return 0;
2009 }
2010
2011 static int vidioc_enum_framesizes(struct file *file, void *priv,
2012                                   struct v4l2_frmsizeenum *fsize)
2013 {
2014         struct em28xx         *dev = video_drvdata(file);
2015         struct em28xx_fmt     *fmt;
2016         unsigned int          maxw = norm_maxw(dev);
2017         unsigned int          maxh = norm_maxh(dev);
2018
2019         fmt = format_by_fourcc(fsize->pixel_format);
2020         if (!fmt) {
2021                 em28xx_videodbg("Fourcc format (%08x) invalid.\n",
2022                                 fsize->pixel_format);
2023                 return -EINVAL;
2024         }
2025
2026         if (dev->board.is_em2800) {
2027                 if (fsize->index > 1)
2028                         return -EINVAL;
2029                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
2030                 fsize->discrete.width = maxw / (1 + fsize->index);
2031                 fsize->discrete.height = maxh / (1 + fsize->index);
2032                 return 0;
2033         }
2034
2035         if (fsize->index != 0)
2036                 return -EINVAL;
2037
2038         /* Report a continuous range */
2039         fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
2040         scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
2041                       &fsize->stepwise.min_width, &fsize->stepwise.min_height);
2042         if (fsize->stepwise.min_width < 48)
2043                 fsize->stepwise.min_width = 48;
2044         if (fsize->stepwise.min_height < 38)
2045                 fsize->stepwise.min_height = 38;
2046         fsize->stepwise.max_width = maxw;
2047         fsize->stepwise.max_height = maxh;
2048         fsize->stepwise.step_width = 1;
2049         fsize->stepwise.step_height = 1;
2050         return 0;
2051 }
2052
2053 /* RAW VBI ioctls */
2054
2055 static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
2056                                 struct v4l2_format *format)
2057 {
2058         struct em28xx         *dev  = video_drvdata(file);
2059         struct em28xx_v4l2    *v4l2 = dev->v4l2;
2060
2061         format->fmt.vbi.samples_per_line = v4l2->vbi_width;
2062         format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
2063         format->fmt.vbi.offset = 0;
2064         format->fmt.vbi.flags = 0;
2065         format->fmt.vbi.sampling_rate = 6750000 * 4 / 2;
2066         format->fmt.vbi.count[0] = v4l2->vbi_height;
2067         format->fmt.vbi.count[1] = v4l2->vbi_height;
2068         memset(format->fmt.vbi.reserved, 0, sizeof(format->fmt.vbi.reserved));
2069
2070         /* Varies by video standard (NTSC, PAL, etc.) */
2071         if (v4l2->norm & V4L2_STD_525_60) {
2072                 /* NTSC */
2073                 format->fmt.vbi.start[0] = 10;
2074                 format->fmt.vbi.start[1] = 273;
2075         } else if (v4l2->norm & V4L2_STD_625_50) {
2076                 /* PAL */
2077                 format->fmt.vbi.start[0] = 6;
2078                 format->fmt.vbi.start[1] = 318;
2079         }
2080
2081         return 0;
2082 }
2083
2084 /*
2085  * RADIO ESPECIFIC IOCTLS
2086  */
2087
2088 static int radio_g_tuner(struct file *file, void *priv,
2089                          struct v4l2_tuner *t)
2090 {
2091         struct em28xx *dev = video_drvdata(file);
2092
2093         if (unlikely(t->index > 0))
2094                 return -EINVAL;
2095
2096         strscpy(t->name, "Radio", sizeof(t->name));
2097
2098         v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
2099
2100         return 0;
2101 }
2102
2103 static int radio_s_tuner(struct file *file, void *priv,
2104                          const struct v4l2_tuner *t)
2105 {
2106         struct em28xx *dev = video_drvdata(file);
2107
2108         if (t->index != 0)
2109                 return -EINVAL;
2110
2111         v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
2112
2113         return 0;
2114 }
2115
2116 /*
2117  * em28xx_free_v4l2() - Free struct em28xx_v4l2
2118  *
2119  * @ref: struct kref for struct em28xx_v4l2
2120  *
2121  * Called when all users of struct em28xx_v4l2 are gone
2122  */
2123 static void em28xx_free_v4l2(struct kref *ref)
2124 {
2125         struct em28xx_v4l2 *v4l2 = container_of(ref, struct em28xx_v4l2, ref);
2126
2127         v4l2->dev->v4l2 = NULL;
2128         kfree(v4l2);
2129 }
2130
2131 /*
2132  * em28xx_v4l2_open()
2133  * inits the device and starts isoc transfer
2134  */
2135 static int em28xx_v4l2_open(struct file *filp)
2136 {
2137         struct video_device *vdev = video_devdata(filp);
2138         struct em28xx *dev = video_drvdata(filp);
2139         struct em28xx_v4l2 *v4l2 = dev->v4l2;
2140         enum v4l2_buf_type fh_type = 0;
2141         int ret;
2142
2143         switch (vdev->vfl_type) {
2144         case VFL_TYPE_GRABBER:
2145                 fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2146                 break;
2147         case VFL_TYPE_VBI:
2148                 fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
2149                 break;
2150         case VFL_TYPE_RADIO:
2151                 break;
2152         default:
2153                 return -EINVAL;
2154         }
2155
2156         em28xx_videodbg("open dev=%s type=%s users=%d\n",
2157                         video_device_node_name(vdev), v4l2_type_names[fh_type],
2158                         v4l2->users);
2159
2160         if (mutex_lock_interruptible(&dev->lock))
2161                 return -ERESTARTSYS;
2162
2163         ret = v4l2_fh_open(filp);
2164         if (ret) {
2165                 dev_err(&dev->intf->dev,
2166                         "%s: v4l2_fh_open() returned error %d\n",
2167                        __func__, ret);
2168                 mutex_unlock(&dev->lock);
2169                 return ret;
2170         }
2171
2172         if (v4l2->users == 0) {
2173                 em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
2174
2175                 if (vdev->vfl_type != VFL_TYPE_RADIO)
2176                         em28xx_resolution_set(dev);
2177
2178                 /*
2179                  * Needed, since GPIO might have disabled power
2180                  * of some i2c devices
2181                  */
2182                 em28xx_wake_i2c(dev);
2183         }
2184
2185         if (vdev->vfl_type == VFL_TYPE_RADIO) {
2186                 em28xx_videodbg("video_open: setting radio device\n");
2187                 v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
2188         }
2189
2190         kref_get(&dev->ref);
2191         kref_get(&v4l2->ref);
2192         v4l2->users++;
2193
2194         mutex_unlock(&dev->lock);
2195
2196         return 0;
2197 }
2198
2199 /*
2200  * em28xx_v4l2_fini()
2201  * unregisters the v4l2,i2c and usb devices
2202  * called when the device gets disconected or at module unload
2203  */
2204 static int em28xx_v4l2_fini(struct em28xx *dev)
2205 {
2206         struct em28xx_v4l2 *v4l2 = dev->v4l2;
2207
2208         if (dev->is_audio_only) {
2209                 /* Shouldn't initialize IR for this interface */
2210                 return 0;
2211         }
2212
2213         if (!dev->has_video) {
2214                 /* This device does not support the v4l2 extension */
2215                 return 0;
2216         }
2217
2218         if (!v4l2)
2219                 return 0;
2220
2221         dev_info(&dev->intf->dev, "Closing video extension\n");
2222
2223         mutex_lock(&dev->lock);
2224
2225         v4l2_device_disconnect(&v4l2->v4l2_dev);
2226
2227         em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
2228
2229         em28xx_v4l2_media_release(dev);
2230
2231         if (video_is_registered(&v4l2->radio_dev)) {
2232                 dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2233                          video_device_node_name(&v4l2->radio_dev));
2234                 video_unregister_device(&v4l2->radio_dev);
2235         }
2236         if (video_is_registered(&v4l2->vbi_dev)) {
2237                 dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2238                          video_device_node_name(&v4l2->vbi_dev));
2239                 video_unregister_device(&v4l2->vbi_dev);
2240         }
2241         if (video_is_registered(&v4l2->vdev)) {
2242                 dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
2243                          video_device_node_name(&v4l2->vdev));
2244                 video_unregister_device(&v4l2->vdev);
2245         }
2246
2247         v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
2248         v4l2_device_unregister(&v4l2->v4l2_dev);
2249
2250         kref_put(&v4l2->ref, em28xx_free_v4l2);
2251
2252         mutex_unlock(&dev->lock);
2253
2254         kref_put(&dev->ref, em28xx_free_device);
2255
2256         return 0;
2257 }
2258
2259 static int em28xx_v4l2_suspend(struct em28xx *dev)
2260 {
2261         if (dev->is_audio_only)
2262                 return 0;
2263
2264         if (!dev->has_video)
2265                 return 0;
2266
2267         dev_info(&dev->intf->dev, "Suspending video extension\n");
2268         em28xx_stop_urbs(dev);
2269         return 0;
2270 }
2271
2272 static int em28xx_v4l2_resume(struct em28xx *dev)
2273 {
2274         if (dev->is_audio_only)
2275                 return 0;
2276
2277         if (!dev->has_video)
2278                 return 0;
2279
2280         dev_info(&dev->intf->dev, "Resuming video extension\n");
2281         /* what do we do here */
2282         return 0;
2283 }
2284
2285 /*
2286  * em28xx_v4l2_close()
2287  * stops streaming and deallocates all resources allocated by the v4l2
2288  * calls and ioctls
2289  */
2290 static int em28xx_v4l2_close(struct file *filp)
2291 {
2292         struct em28xx         *dev  = video_drvdata(filp);
2293         struct em28xx_v4l2    *v4l2 = dev->v4l2;
2294         struct usb_device *udev = interface_to_usbdev(dev->intf);
2295         int              err;
2296
2297         em28xx_videodbg("users=%d\n", v4l2->users);
2298
2299         vb2_fop_release(filp);
2300         mutex_lock(&dev->lock);
2301
2302         if (v4l2->users == 1) {
2303                 /* No sense to try to write to the device */
2304                 if (dev->disconnected)
2305                         goto exit;
2306
2307                 /* Save some power by putting tuner to sleep */
2308                 v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
2309
2310                 /* do this before setting alternate! */
2311                 em28xx_set_mode(dev, EM28XX_SUSPEND);
2312
2313                 /* set alternate 0 */
2314                 dev->alt = 0;
2315                 em28xx_videodbg("setting alternate 0\n");
2316                 err = usb_set_interface(udev, 0, 0);
2317                 if (err < 0) {
2318                         dev_err(&dev->intf->dev,
2319                                 "cannot change alternate number to 0 (error=%i)\n",
2320                                 err);
2321                 }
2322         }
2323
2324 exit:
2325         v4l2->users--;
2326         kref_put(&v4l2->ref, em28xx_free_v4l2);
2327         mutex_unlock(&dev->lock);
2328         kref_put(&dev->ref, em28xx_free_device);
2329
2330         return 0;
2331 }
2332
2333 static const struct v4l2_file_operations em28xx_v4l_fops = {
2334         .owner         = THIS_MODULE,
2335         .open          = em28xx_v4l2_open,
2336         .release       = em28xx_v4l2_close,
2337         .read          = vb2_fop_read,
2338         .poll          = vb2_fop_poll,
2339         .mmap          = vb2_fop_mmap,
2340         .unlocked_ioctl = video_ioctl2,
2341 };
2342
2343 static const struct v4l2_ioctl_ops video_ioctl_ops = {
2344         .vidioc_querycap            = vidioc_querycap,
2345         .vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
2346         .vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
2347         .vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
2348         .vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
2349         .vidioc_g_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
2350         .vidioc_try_fmt_vbi_cap     = vidioc_g_fmt_vbi_cap,
2351         .vidioc_s_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
2352         .vidioc_enum_framesizes     = vidioc_enum_framesizes,
2353         .vidioc_enumaudio           = vidioc_enumaudio,
2354         .vidioc_g_audio             = vidioc_g_audio,
2355         .vidioc_s_audio             = vidioc_s_audio,
2356
2357         .vidioc_reqbufs             = vb2_ioctl_reqbufs,
2358         .vidioc_create_bufs         = vb2_ioctl_create_bufs,
2359         .vidioc_prepare_buf         = vb2_ioctl_prepare_buf,
2360         .vidioc_querybuf            = vb2_ioctl_querybuf,
2361         .vidioc_qbuf                = vb2_ioctl_qbuf,
2362         .vidioc_dqbuf               = vb2_ioctl_dqbuf,
2363
2364         .vidioc_g_std               = vidioc_g_std,
2365         .vidioc_querystd            = vidioc_querystd,
2366         .vidioc_s_std               = vidioc_s_std,
2367         .vidioc_g_parm              = vidioc_g_parm,
2368         .vidioc_s_parm              = vidioc_s_parm,
2369         .vidioc_enum_input          = vidioc_enum_input,
2370         .vidioc_g_input             = vidioc_g_input,
2371         .vidioc_s_input             = vidioc_s_input,
2372         .vidioc_streamon            = vb2_ioctl_streamon,
2373         .vidioc_streamoff           = vb2_ioctl_streamoff,
2374         .vidioc_g_tuner             = vidioc_g_tuner,
2375         .vidioc_s_tuner             = vidioc_s_tuner,
2376         .vidioc_g_frequency         = vidioc_g_frequency,
2377         .vidioc_s_frequency         = vidioc_s_frequency,
2378         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2379         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2380 #ifdef CONFIG_VIDEO_ADV_DEBUG
2381         .vidioc_g_chip_info         = vidioc_g_chip_info,
2382         .vidioc_g_register          = vidioc_g_register,
2383         .vidioc_s_register          = vidioc_s_register,
2384 #endif
2385 };
2386
2387 static const struct video_device em28xx_video_template = {
2388         .fops           = &em28xx_v4l_fops,
2389         .ioctl_ops      = &video_ioctl_ops,
2390         .release        = video_device_release_empty,
2391         .tvnorms        = V4L2_STD_ALL,
2392 };
2393
2394 static const struct v4l2_file_operations radio_fops = {
2395         .owner         = THIS_MODULE,
2396         .open          = em28xx_v4l2_open,
2397         .release       = em28xx_v4l2_close,
2398         .unlocked_ioctl = video_ioctl2,
2399 };
2400
2401 static const struct v4l2_ioctl_ops radio_ioctl_ops = {
2402         .vidioc_querycap      = vidioc_querycap,
2403         .vidioc_g_tuner       = radio_g_tuner,
2404         .vidioc_s_tuner       = radio_s_tuner,
2405         .vidioc_g_frequency   = vidioc_g_frequency,
2406         .vidioc_s_frequency   = vidioc_s_frequency,
2407         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2408         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2409 #ifdef CONFIG_VIDEO_ADV_DEBUG
2410         .vidioc_g_chip_info   = vidioc_g_chip_info,
2411         .vidioc_g_register    = vidioc_g_register,
2412         .vidioc_s_register    = vidioc_s_register,
2413 #endif
2414 };
2415
2416 static struct video_device em28xx_radio_template = {
2417         .fops           = &radio_fops,
2418         .ioctl_ops      = &radio_ioctl_ops,
2419         .release        = video_device_release_empty,
2420 };
2421
2422 /* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
2423 static unsigned short saa711x_addrs[] = {
2424         0x4a >> 1, 0x48 >> 1,   /* SAA7111, SAA7111A and SAA7113 */
2425         0x42 >> 1, 0x40 >> 1,   /* SAA7114, SAA7115 and SAA7118 */
2426         I2C_CLIENT_END };
2427
2428 static unsigned short tvp5150_addrs[] = {
2429         0xb8 >> 1,
2430         0xba >> 1,
2431         I2C_CLIENT_END
2432 };
2433
2434 static unsigned short msp3400_addrs[] = {
2435         0x80 >> 1,
2436         0x88 >> 1,
2437         I2C_CLIENT_END
2438 };
2439
2440 /******************************** usb interface ******************************/
2441
2442 static void em28xx_vdev_init(struct em28xx *dev,
2443                              struct video_device *vfd,
2444                              const struct video_device *template,
2445                              const char *type_name)
2446 {
2447         *vfd            = *template;
2448         vfd->v4l2_dev   = &dev->v4l2->v4l2_dev;
2449         vfd->lock       = &dev->lock;
2450         if (dev->is_webcam)
2451                 vfd->tvnorms = 0;
2452
2453         snprintf(vfd->name, sizeof(vfd->name), "%s %s",
2454                  dev_name(&dev->intf->dev), type_name);
2455
2456         video_set_drvdata(vfd, dev);
2457 }
2458
2459 static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr)
2460 {
2461         struct em28xx_v4l2      *v4l2 = dev->v4l2;
2462         struct v4l2_device      *v4l2_dev = &v4l2->v4l2_dev;
2463         struct tuner_setup      tun_setup;
2464         struct v4l2_frequency   f;
2465
2466         memset(&tun_setup, 0, sizeof(tun_setup));
2467
2468         tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
2469         tun_setup.tuner_callback = em28xx_tuner_callback;
2470
2471         if (dev->board.radio.type) {
2472                 tun_setup.type = dev->board.radio.type;
2473                 tun_setup.addr = dev->board.radio_addr;
2474
2475                 v4l2_device_call_all(v4l2_dev,
2476                                      0, tuner, s_type_addr, &tun_setup);
2477         }
2478
2479         if (dev->tuner_type != TUNER_ABSENT && dev->tuner_type) {
2480                 tun_setup.type   = dev->tuner_type;
2481                 tun_setup.addr   = tuner_addr;
2482
2483                 v4l2_device_call_all(v4l2_dev,
2484                                      0, tuner, s_type_addr, &tun_setup);
2485         }
2486
2487         if (dev->board.tda9887_conf) {
2488                 struct v4l2_priv_tun_config tda9887_cfg;
2489
2490                 tda9887_cfg.tuner = TUNER_TDA9887;
2491                 tda9887_cfg.priv = &dev->board.tda9887_conf;
2492
2493                 v4l2_device_call_all(v4l2_dev,
2494                                      0, tuner, s_config, &tda9887_cfg);
2495         }
2496
2497         if (dev->tuner_type == TUNER_XC2028) {
2498                 struct v4l2_priv_tun_config  xc2028_cfg;
2499                 struct xc2028_ctrl           ctl;
2500
2501                 memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
2502                 memset(&ctl, 0, sizeof(ctl));
2503
2504                 em28xx_setup_xc3028(dev, &ctl);
2505
2506                 xc2028_cfg.tuner = TUNER_XC2028;
2507                 xc2028_cfg.priv  = &ctl;
2508
2509                 v4l2_device_call_all(v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
2510         }
2511
2512         /* configure tuner */
2513         f.tuner = 0;
2514         f.type = V4L2_TUNER_ANALOG_TV;
2515         f.frequency = 9076;     /* just a magic number */
2516         v4l2->frequency = f.frequency;
2517         v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
2518 }
2519
2520 static int em28xx_v4l2_init(struct em28xx *dev)
2521 {
2522         u8 val;
2523         int ret;
2524         unsigned int maxw;
2525         struct v4l2_ctrl_handler *hdl;
2526         struct em28xx_v4l2 *v4l2;
2527
2528         if (dev->is_audio_only) {
2529                 /* Shouldn't initialize IR for this interface */
2530                 return 0;
2531         }
2532
2533         if (!dev->has_video) {
2534                 /* This device does not support the v4l2 extension */
2535                 return 0;
2536         }
2537
2538         dev_info(&dev->intf->dev, "Registering V4L2 extension\n");
2539
2540         mutex_lock(&dev->lock);
2541
2542         v4l2 = kzalloc(sizeof(*v4l2), GFP_KERNEL);
2543         if (!v4l2) {
2544                 mutex_unlock(&dev->lock);
2545                 return -ENOMEM;
2546         }
2547         kref_init(&v4l2->ref);
2548         v4l2->dev = dev;
2549         dev->v4l2 = v4l2;
2550
2551 #ifdef CONFIG_MEDIA_CONTROLLER
2552         v4l2->v4l2_dev.mdev = dev->media_dev;
2553 #endif
2554         ret = v4l2_device_register(&dev->intf->dev, &v4l2->v4l2_dev);
2555         if (ret < 0) {
2556                 dev_err(&dev->intf->dev,
2557                         "Call to v4l2_device_register() failed!\n");
2558                 goto err;
2559         }
2560
2561         hdl = &v4l2->ctrl_handler;
2562         v4l2_ctrl_handler_init(hdl, 8);
2563         v4l2->v4l2_dev.ctrl_handler = hdl;
2564
2565         if (dev->is_webcam)
2566                 v4l2->progressive = true;
2567
2568         /*
2569          * Default format, used for tvp5150 or saa711x output formats
2570          */
2571         v4l2->vinmode = EM28XX_VINMODE_YUV422_CbYCrY;
2572         v4l2->vinctl  = EM28XX_VINCTRL_INTERLACED |
2573                         EM28XX_VINCTRL_CCIR656_ENABLE;
2574
2575         /* request some modules */
2576
2577         if (dev->has_msp34xx)
2578                 v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2579                                     &dev->i2c_adap[dev->def_i2c_bus],
2580                                     "msp3400", 0, msp3400_addrs);
2581
2582         if (dev->board.decoder == EM28XX_SAA711X)
2583                 v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2584                                     &dev->i2c_adap[dev->def_i2c_bus],
2585                                     "saa7115_auto", 0, saa711x_addrs);
2586
2587         if (dev->board.decoder == EM28XX_TVP5150)
2588                 v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2589                                     &dev->i2c_adap[dev->def_i2c_bus],
2590                                     "tvp5150", 0, tvp5150_addrs);
2591
2592         if (dev->board.adecoder == EM28XX_TVAUDIO)
2593                 v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2594                                     &dev->i2c_adap[dev->def_i2c_bus],
2595                                     "tvaudio", dev->board.tvaudio_addr, NULL);
2596
2597         /* Initialize tuner and camera */
2598
2599         if (dev->board.tuner_type != TUNER_ABSENT) {
2600                 unsigned short tuner_addr = dev->board.tuner_addr;
2601                 int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);
2602
2603                 if (dev->board.radio.type)
2604                         v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2605                                             &dev->i2c_adap[dev->def_i2c_bus],
2606                                             "tuner", dev->board.radio_addr,
2607                                             NULL);
2608
2609                 if (has_demod)
2610                         v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2611                                             &dev->i2c_adap[dev->def_i2c_bus],
2612                                             "tuner", 0,
2613                                             v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
2614                 if (tuner_addr == 0) {
2615                         enum v4l2_i2c_tuner_type type =
2616                                 has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
2617                         struct v4l2_subdev *sd;
2618
2619                         sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2620                                                  &dev->i2c_adap[dev->def_i2c_bus],
2621                                                  "tuner", 0,
2622                                                  v4l2_i2c_tuner_addrs(type));
2623
2624                         if (sd)
2625                                 tuner_addr = v4l2_i2c_subdev_addr(sd);
2626                 } else {
2627                         v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
2628                                             &dev->i2c_adap[dev->def_i2c_bus],
2629                                             "tuner", tuner_addr, NULL);
2630                 }
2631
2632                 em28xx_tuner_setup(dev, tuner_addr);
2633         }
2634
2635         if (dev->em28xx_sensor != EM28XX_NOSENSOR)
2636                 em28xx_init_camera(dev);
2637
2638         /* Configure audio */
2639         ret = em28xx_audio_setup(dev);
2640         if (ret < 0) {
2641                 dev_err(&dev->intf->dev,
2642                         "%s: Error while setting audio - error [%d]!\n",
2643                         __func__, ret);
2644                 goto unregister_dev;
2645         }
2646         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
2647                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2648                                   V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
2649                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2650                                   V4L2_CID_AUDIO_VOLUME, 0, 0x1f, 1, 0x1f);
2651         } else {
2652                 /* install the em28xx notify callback */
2653                 v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_MUTE),
2654                                  em28xx_ctrl_notify, dev);
2655                 v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_VOLUME),
2656                                  em28xx_ctrl_notify, dev);
2657         }
2658
2659         /* wake i2c devices */
2660         em28xx_wake_i2c(dev);
2661
2662         /* init video dma queues */
2663         INIT_LIST_HEAD(&dev->vidq.active);
2664         INIT_LIST_HEAD(&dev->vbiq.active);
2665
2666         if (dev->has_msp34xx) {
2667                 /* Send a reset to other chips via gpio */
2668                 ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xf7);
2669                 if (ret < 0) {
2670                         dev_err(&dev->intf->dev,
2671                                 "%s: em28xx_write_reg - msp34xx(1) failed! error [%d]\n",
2672                                 __func__, ret);
2673                         goto unregister_dev;
2674                 }
2675                 usleep_range(10000, 11000);
2676
2677                 ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xff);
2678                 if (ret < 0) {
2679                         dev_err(&dev->intf->dev,
2680                                 "%s: em28xx_write_reg - msp34xx(2) failed! error [%d]\n",
2681                                 __func__, ret);
2682                         goto unregister_dev;
2683                 }
2684                 usleep_range(10000, 11000);
2685         }
2686
2687         /* set default norm */
2688         v4l2->norm = V4L2_STD_PAL;
2689         v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
2690         v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;
2691
2692         /* Analog specific initialization */
2693         v4l2->format = &format[0];
2694
2695         maxw = norm_maxw(dev);
2696         /*
2697          * MaxPacketSize for em2800 is too small to capture at full resolution
2698          * use half of maxw as the scaler can only scale to 50%
2699          */
2700         if (dev->board.is_em2800)
2701                 maxw /= 2;
2702
2703         em28xx_set_video_format(dev, format[0].fourcc,
2704                                 maxw, norm_maxh(dev));
2705
2706         video_mux(dev, 0);
2707
2708         /* Audio defaults */
2709         dev->mute = 1;
2710         dev->volume = 0x1f;
2711
2712 /*      em28xx_write_reg(dev, EM28XX_R0E_AUDIOSRC, 0xc0); audio register */
2713         val = (u8)em28xx_read_reg(dev, EM28XX_R0F_XCLK);
2714         em28xx_write_reg(dev, EM28XX_R0F_XCLK,
2715                          (EM28XX_XCLK_AUDIO_UNMUTE | val));
2716
2717         em28xx_set_outfmt(dev);
2718
2719         /* Add image controls */
2720
2721         /*
2722          * NOTE: at this point, the subdevices are already registered, so
2723          * bridge controls are only added/enabled when no subdevice provides
2724          * them
2725          */
2726         if (!v4l2_ctrl_find(hdl, V4L2_CID_CONTRAST))
2727                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2728                                   V4L2_CID_CONTRAST,
2729                                   0, 0x1f, 1, CONTRAST_DEFAULT);
2730         if (!v4l2_ctrl_find(hdl, V4L2_CID_BRIGHTNESS))
2731                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2732                                   V4L2_CID_BRIGHTNESS,
2733                                   -0x80, 0x7f, 1, BRIGHTNESS_DEFAULT);
2734         if (!v4l2_ctrl_find(hdl, V4L2_CID_SATURATION))
2735                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2736                                   V4L2_CID_SATURATION,
2737                                   0, 0x1f, 1, SATURATION_DEFAULT);
2738         if (!v4l2_ctrl_find(hdl, V4L2_CID_BLUE_BALANCE))
2739                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2740                                   V4L2_CID_BLUE_BALANCE,
2741                                   -0x30, 0x30, 1, BLUE_BALANCE_DEFAULT);
2742         if (!v4l2_ctrl_find(hdl, V4L2_CID_RED_BALANCE))
2743                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2744                                   V4L2_CID_RED_BALANCE,
2745                                   -0x30, 0x30, 1, RED_BALANCE_DEFAULT);
2746         if (!v4l2_ctrl_find(hdl, V4L2_CID_SHARPNESS))
2747                 v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
2748                                   V4L2_CID_SHARPNESS,
2749                                   0, 0x0f, 1, SHARPNESS_DEFAULT);
2750
2751         /* Reset image controls */
2752         em28xx_colorlevels_set_default(dev);
2753         v4l2_ctrl_handler_setup(hdl);
2754         ret = hdl->error;
2755         if (ret)
2756                 goto unregister_dev;
2757
2758         /* allocate and fill video video_device struct */
2759         em28xx_vdev_init(dev, &v4l2->vdev, &em28xx_video_template, "video");
2760         mutex_init(&v4l2->vb_queue_lock);
2761         mutex_init(&v4l2->vb_vbi_queue_lock);
2762         v4l2->vdev.queue = &v4l2->vb_vidq;
2763         v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
2764         v4l2->vdev.device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE |
2765                                  V4L2_CAP_STREAMING;
2766         if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
2767                 v4l2->vdev.device_caps |= V4L2_CAP_AUDIO;
2768         if (dev->tuner_type != TUNER_ABSENT)
2769                 v4l2->vdev.device_caps |= V4L2_CAP_TUNER;
2770
2771
2772         /* disable inapplicable ioctls */
2773         if (dev->is_webcam) {
2774                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_QUERYSTD);
2775                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
2776                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_STD);
2777         } else {
2778                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_PARM);
2779         }
2780         if (dev->tuner_type == TUNER_ABSENT) {
2781                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_TUNER);
2782                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_TUNER);
2783                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_FREQUENCY);
2784                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_FREQUENCY);
2785         }
2786         if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
2787                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_AUDIO);
2788                 v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_AUDIO);
2789         }
2790
2791         /* register v4l2 video video_device */
2792         ret = video_register_device(&v4l2->vdev, VFL_TYPE_GRABBER,
2793                                     video_nr[dev->devno]);
2794         if (ret) {
2795                 dev_err(&dev->intf->dev,
2796                         "unable to register video device (error=%i).\n", ret);
2797                 goto unregister_dev;
2798         }
2799
2800         /* Allocate and fill vbi video_device struct */
2801         if (em28xx_vbi_supported(dev) == 1) {
2802                 em28xx_vdev_init(dev, &v4l2->vbi_dev, &em28xx_video_template,
2803                                  "vbi");
2804
2805                 v4l2->vbi_dev.queue = &v4l2->vb_vbiq;
2806                 v4l2->vbi_dev.queue->lock = &v4l2->vb_vbi_queue_lock;
2807                 v4l2->vbi_dev.device_caps = V4L2_CAP_STREAMING |
2808                         V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE;
2809                 if (dev->tuner_type != TUNER_ABSENT)
2810                         v4l2->vbi_dev.device_caps |= V4L2_CAP_TUNER;
2811
2812                 /* disable inapplicable ioctls */
2813                 v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_PARM);
2814                 if (dev->tuner_type == TUNER_ABSENT) {
2815                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_TUNER);
2816                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_TUNER);
2817                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_FREQUENCY);
2818                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_FREQUENCY);
2819                 }
2820                 if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
2821                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_AUDIO);
2822                         v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_AUDIO);
2823                 }
2824
2825                 /* register v4l2 vbi video_device */
2826                 ret = video_register_device(&v4l2->vbi_dev, VFL_TYPE_VBI,
2827                                             vbi_nr[dev->devno]);
2828                 if (ret < 0) {
2829                         dev_err(&dev->intf->dev,
2830                                 "unable to register vbi device\n");
2831                         goto unregister_dev;
2832                 }
2833         }
2834
2835         if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
2836                 em28xx_vdev_init(dev, &v4l2->radio_dev, &em28xx_radio_template,
2837                                  "radio");
2838                 v4l2->radio_dev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
2839                 ret = video_register_device(&v4l2->radio_dev, VFL_TYPE_RADIO,
2840                                             radio_nr[dev->devno]);
2841                 if (ret < 0) {
2842                         dev_err(&dev->intf->dev,
2843                                 "can't register radio device\n");
2844                         goto unregister_dev;
2845                 }
2846                 dev_info(&dev->intf->dev,
2847                          "Registered radio device as %s\n",
2848                          video_device_node_name(&v4l2->radio_dev));
2849         }
2850
2851         /* Init entities at the Media Controller */
2852         em28xx_v4l2_create_entities(dev);
2853
2854 #ifdef CONFIG_MEDIA_CONTROLLER
2855         ret = v4l2_mc_create_media_graph(dev->media_dev);
2856         if (ret) {
2857                 dev_err(&dev->intf->dev,
2858                         "failed to create media graph\n");
2859                 em28xx_v4l2_media_release(dev);
2860                 goto unregister_dev;
2861         }
2862 #endif
2863
2864         dev_info(&dev->intf->dev,
2865                  "V4L2 video device registered as %s\n",
2866                  video_device_node_name(&v4l2->vdev));
2867
2868         if (video_is_registered(&v4l2->vbi_dev))
2869                 dev_info(&dev->intf->dev,
2870                          "V4L2 VBI device registered as %s\n",
2871                          video_device_node_name(&v4l2->vbi_dev));
2872
2873         /* Save some power by putting tuner to sleep */
2874         v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
2875
2876         /* initialize videobuf2 stuff */
2877         em28xx_vb2_setup(dev);
2878
2879         dev_info(&dev->intf->dev,
2880                  "V4L2 extension successfully initialized\n");
2881
2882         kref_get(&dev->ref);
2883
2884         mutex_unlock(&dev->lock);
2885         return 0;
2886
2887 unregister_dev:
2888         if (video_is_registered(&v4l2->radio_dev)) {
2889                 dev_info(&dev->intf->dev,
2890                          "V4L2 device %s deregistered\n",
2891                          video_device_node_name(&v4l2->radio_dev));
2892                 video_unregister_device(&v4l2->radio_dev);
2893         }
2894         if (video_is_registered(&v4l2->vbi_dev)) {
2895                 dev_info(&dev->intf->dev,
2896                          "V4L2 device %s deregistered\n",
2897                          video_device_node_name(&v4l2->vbi_dev));
2898                 video_unregister_device(&v4l2->vbi_dev);
2899         }
2900         if (video_is_registered(&v4l2->vdev)) {
2901                 dev_info(&dev->intf->dev,
2902                          "V4L2 device %s deregistered\n",
2903                          video_device_node_name(&v4l2->vdev));
2904                 video_unregister_device(&v4l2->vdev);
2905         }
2906
2907         v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
2908         v4l2_device_unregister(&v4l2->v4l2_dev);
2909 err:
2910         dev->v4l2 = NULL;
2911         kref_put(&v4l2->ref, em28xx_free_v4l2);
2912         mutex_unlock(&dev->lock);
2913         return ret;
2914 }
2915
2916 static struct em28xx_ops v4l2_ops = {
2917         .id   = EM28XX_V4L2,
2918         .name = "Em28xx v4l2 Extension",
2919         .init = em28xx_v4l2_init,
2920         .fini = em28xx_v4l2_fini,
2921         .suspend = em28xx_v4l2_suspend,
2922         .resume = em28xx_v4l2_resume,
2923 };
2924
2925 static int __init em28xx_video_register(void)
2926 {
2927         return em28xx_register_extension(&v4l2_ops);
2928 }
2929
2930 static void __exit em28xx_video_unregister(void)
2931 {
2932         em28xx_unregister_extension(&v4l2_ops);
2933 }
2934
2935 module_init(em28xx_video_register);
2936 module_exit(em28xx_video_unregister);