drivers/media/usb/uvc/uvc_driver.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      uvc_driver.c  --  USB Video Class driver
   4  *
   5  *      Copyright (C) 2005-2010
   6  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  */
   8
   9 #include <linux/atomic.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/usb.h>
  15 #include <linux/videodev2.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/wait.h>
  18 #include <linux/version.h>
  19 #include <asm/unaligned.h>
  20
  21 #include <media/v4l2-common.h>
  22 #include <media/v4l2-ioctl.h>
  23
  24 #include "uvcvideo.h"
  25
  26 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  27                                 "<laurent.pinchart@ideasonboard.com>"
  28 #define DRIVER_DESC             "USB Video Class driver"
  29
  30 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  31 unsigned int uvc_hw_timestamps_param;
  32 unsigned int uvc_no_drop_param;
  33 static unsigned int uvc_quirks_param = -1;
  34 unsigned int uvc_trace_param;
  35 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  36
  37 /* ------------------------------------------------------------------------
  38  * Video formats
  39  */
  40
  41 static struct uvc_format_desc uvc_fmts[] = {
  42         {
  43                 .name           = "YUV 4:2:2 (YUYV)",
  44                 .guid           = UVC_GUID_FORMAT_YUY2,
  45                 .fcc            = V4L2_PIX_FMT_YUYV,
  46         },
  47         {
  48                 .name           = "YUV 4:2:2 (YUYV)",
  49                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  50                 .fcc            = V4L2_PIX_FMT_YUYV,
  51         },
  52         {
  53                 .name           = "YUV 4:2:0 (NV12)",
  54                 .guid           = UVC_GUID_FORMAT_NV12,
  55                 .fcc            = V4L2_PIX_FMT_NV12,
  56         },
  57         {
  58                 .name           = "MJPEG",
  59                 .guid           = UVC_GUID_FORMAT_MJPEG,
  60                 .fcc            = V4L2_PIX_FMT_MJPEG,
  61         },
  62         {
  63                 .name           = "YVU 4:2:0 (YV12)",
  64                 .guid           = UVC_GUID_FORMAT_YV12,
  65                 .fcc            = V4L2_PIX_FMT_YVU420,
  66         },
  67         {
  68                 .name           = "YUV 4:2:0 (I420)",
  69                 .guid           = UVC_GUID_FORMAT_I420,
  70                 .fcc            = V4L2_PIX_FMT_YUV420,
  71         },
  72         {
  73                 .name           = "YUV 4:2:0 (M420)",
  74                 .guid           = UVC_GUID_FORMAT_M420,
  75                 .fcc            = V4L2_PIX_FMT_M420,
  76         },
  77         {
  78                 .name           = "YUV 4:2:2 (UYVY)",
  79                 .guid           = UVC_GUID_FORMAT_UYVY,
  80                 .fcc            = V4L2_PIX_FMT_UYVY,
  81         },
  82         {
  83                 .name           = "Greyscale 8-bit (Y800)",
  84                 .guid           = UVC_GUID_FORMAT_Y800,
  85                 .fcc            = V4L2_PIX_FMT_GREY,
  86         },
  87         {
  88                 .name           = "Greyscale 8-bit (Y8  )",
  89                 .guid           = UVC_GUID_FORMAT_Y8,
  90                 .fcc            = V4L2_PIX_FMT_GREY,
  91         },
  92         {
  93                 .name           = "Greyscale 8-bit (D3DFMT_L8)",
  94                 .guid           = UVC_GUID_FORMAT_D3DFMT_L8,
  95                 .fcc            = V4L2_PIX_FMT_GREY,
  96         },
  97         {
  98                 .name           = "IR 8-bit (L8_IR)",
  99                 .guid           = UVC_GUID_FORMAT_KSMEDIA_L8_IR,
 100                 .fcc            = V4L2_PIX_FMT_GREY,
 101         },
 102         {
 103                 .name           = "Greyscale 10-bit (Y10 )",
 104                 .guid           = UVC_GUID_FORMAT_Y10,
 105                 .fcc            = V4L2_PIX_FMT_Y10,
 106         },
 107         {
 108                 .name           = "Greyscale 12-bit (Y12 )",
 109                 .guid           = UVC_GUID_FORMAT_Y12,
 110                 .fcc            = V4L2_PIX_FMT_Y12,
 111         },
 112         {
 113                 .name           = "Greyscale 16-bit (Y16 )",
 114                 .guid           = UVC_GUID_FORMAT_Y16,
 115                 .fcc            = V4L2_PIX_FMT_Y16,
 116         },
 117         {
 118                 .name           = "BGGR Bayer (BY8 )",
 119                 .guid           = UVC_GUID_FORMAT_BY8,
 120                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 121         },
 122         {
 123                 .name           = "BGGR Bayer (BA81)",
 124                 .guid           = UVC_GUID_FORMAT_BA81,
 125                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 126         },
 127         {
 128                 .name           = "GBRG Bayer (GBRG)",
 129                 .guid           = UVC_GUID_FORMAT_GBRG,
 130                 .fcc            = V4L2_PIX_FMT_SGBRG8,
 131         },
 132         {
 133                 .name           = "GRBG Bayer (GRBG)",
 134                 .guid           = UVC_GUID_FORMAT_GRBG,
 135                 .fcc            = V4L2_PIX_FMT_SGRBG8,
 136         },
 137         {
 138                 .name           = "RGGB Bayer (RGGB)",
 139                 .guid           = UVC_GUID_FORMAT_RGGB,
 140                 .fcc            = V4L2_PIX_FMT_SRGGB8,
 141         },
 142         {
 143                 .name           = "RGB565",
 144                 .guid           = UVC_GUID_FORMAT_RGBP,
 145                 .fcc            = V4L2_PIX_FMT_RGB565,
 146         },
 147         {
 148                 .name           = "BGR 8:8:8 (BGR3)",
 149                 .guid           = UVC_GUID_FORMAT_BGR3,
 150                 .fcc            = V4L2_PIX_FMT_BGR24,
 151         },
 152         {
 153                 .name           = "H.264",
 154                 .guid           = UVC_GUID_FORMAT_H264,
 155                 .fcc            = V4L2_PIX_FMT_H264,
 156         },
 157         {
 158                 .name           = "Greyscale 8 L/R (Y8I)",
 159                 .guid           = UVC_GUID_FORMAT_Y8I,
 160                 .fcc            = V4L2_PIX_FMT_Y8I,
 161         },
 162         {
 163                 .name           = "Greyscale 12 L/R (Y12I)",
 164                 .guid           = UVC_GUID_FORMAT_Y12I,
 165                 .fcc            = V4L2_PIX_FMT_Y12I,
 166         },
 167         {
 168                 .name           = "Depth data 16-bit (Z16)",
 169                 .guid           = UVC_GUID_FORMAT_Z16,
 170                 .fcc            = V4L2_PIX_FMT_Z16,
 171         },
 172         {
 173                 .name           = "Bayer 10-bit (SRGGB10P)",
 174                 .guid           = UVC_GUID_FORMAT_RW10,
 175                 .fcc            = V4L2_PIX_FMT_SRGGB10P,
 176         },
 177         {
 178                 .name           = "Bayer 16-bit (SBGGR16)",
 179                 .guid           = UVC_GUID_FORMAT_BG16,
 180                 .fcc            = V4L2_PIX_FMT_SBGGR16,
 181         },
 182         {
 183                 .name           = "Bayer 16-bit (SGBRG16)",
 184                 .guid           = UVC_GUID_FORMAT_GB16,
 185                 .fcc            = V4L2_PIX_FMT_SGBRG16,
 186         },
 187         {
 188                 .name           = "Bayer 16-bit (SRGGB16)",
 189                 .guid           = UVC_GUID_FORMAT_RG16,
 190                 .fcc            = V4L2_PIX_FMT_SRGGB16,
 191         },
 192         {
 193                 .name           = "Bayer 16-bit (SGRBG16)",
 194                 .guid           = UVC_GUID_FORMAT_GR16,
 195                 .fcc            = V4L2_PIX_FMT_SGRBG16,
 196         },
 197         {
 198                 .name           = "Depth data 16-bit (Z16)",
 199                 .guid           = UVC_GUID_FORMAT_INVZ,
 200                 .fcc            = V4L2_PIX_FMT_Z16,
 201         },
 202         {
 203                 .name           = "Greyscale 10-bit (Y10 )",
 204                 .guid           = UVC_GUID_FORMAT_INVI,
 205                 .fcc            = V4L2_PIX_FMT_Y10,
 206         },
 207         {
 208                 .name           = "IR:Depth 26-bit (INZI)",
 209                 .guid           = UVC_GUID_FORMAT_INZI,
 210                 .fcc            = V4L2_PIX_FMT_INZI,
 211         },
 212         {
 213                 .name           = "4-bit Depth Confidence (Packed)",
 214                 .guid           = UVC_GUID_FORMAT_CNF4,
 215                 .fcc            = V4L2_PIX_FMT_CNF4,
 216         },
 217 };
 218
 219 /* ------------------------------------------------------------------------
 220  * Utility functions
 221  */
 222
 223 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 224                 u8 epaddr)
 225 {
 226         struct usb_host_endpoint *ep;
 227         unsigned int i;
 228
 229         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 230                 ep = &alts->endpoint[i];
 231                 if (ep->desc.bEndpointAddress == epaddr)
 232                         return ep;
 233         }
 234
 235         return NULL;
 236 }
 237
 238 static struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16])
 239 {
 240         unsigned int len = ARRAY_SIZE(uvc_fmts);
 241         unsigned int i;
 242
 243         for (i = 0; i < len; ++i) {
 244                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 245                         return &uvc_fmts[i];
 246         }
 247
 248         return NULL;
 249 }
 250
 251 static u32 uvc_colorspace(const u8 primaries)
 252 {
 253         static const u8 colorprimaries[] = {
 254                 0,
 255                 V4L2_COLORSPACE_SRGB,
 256                 V4L2_COLORSPACE_470_SYSTEM_M,
 257                 V4L2_COLORSPACE_470_SYSTEM_BG,
 258                 V4L2_COLORSPACE_SMPTE170M,
 259                 V4L2_COLORSPACE_SMPTE240M,
 260         };
 261
 262         if (primaries < ARRAY_SIZE(colorprimaries))
 263                 return colorprimaries[primaries];
 264
 265         return 0;
 266 }
 267
 268 /* Simplify a fraction using a simple continued fraction decomposition. The
 269  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 270  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 271  * arbitrary parameters to remove non-significative terms from the simple
 272  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 273  * respectively seems to give nice results.
 274  */
 275 void uvc_simplify_fraction(u32 *numerator, u32 *denominator,
 276                 unsigned int n_terms, unsigned int threshold)
 277 {
 278         u32 *an;
 279         u32 x, y, r;
 280         unsigned int i, n;
 281
 282         an = kmalloc_array(n_terms, sizeof(*an), GFP_KERNEL);
 283         if (an == NULL)
 284                 return;
 285
 286         /* Convert the fraction to a simple continued fraction. See
 287          * http://mathforum.org/dr.math/faq/faq.fractions.html
 288          * Stop if the current term is bigger than or equal to the given
 289          * threshold.
 290          */
 291         x = *numerator;
 292         y = *denominator;
 293
 294         for (n = 0; n < n_terms && y != 0; ++n) {
 295                 an[n] = x / y;
 296                 if (an[n] >= threshold) {
 297                         if (n < 2)
 298                                 n++;
 299                         break;
 300                 }
 301
 302                 r = x - an[n] * y;
 303                 x = y;
 304                 y = r;
 305         }
 306
 307         /* Expand the simple continued fraction back to an integer fraction. */
 308         x = 0;
 309         y = 1;
 310
 311         for (i = n; i > 0; --i) {
 312                 r = y;
 313                 y = an[i-1] * y + x;
 314                 x = r;
 315         }
 316
 317         *numerator = y;
 318         *denominator = x;
 319         kfree(an);
 320 }
 321
 322 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 323  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 324  * arithmetic only.
 325  */
 326 u32 uvc_fraction_to_interval(u32 numerator, u32 denominator)
 327 {
 328         u32 multiplier;
 329
 330         /* Saturate the result if the operation would overflow. */
 331         if (denominator == 0 ||
 332             numerator/denominator >= ((u32)-1)/10000000)
 333                 return (u32)-1;
 334
 335         /* Divide both the denominator and the multiplier by two until
 336          * numerator * multiplier doesn't overflow. If anyone knows a better
 337          * algorithm please let me know.
 338          */
 339         multiplier = 10000000;
 340         while (numerator > ((u32)-1)/multiplier) {
 341                 multiplier /= 2;
 342                 denominator /= 2;
 343         }
 344
 345         return denominator ? numerator * multiplier / denominator : 0;
 346 }
 347
 348 /* ------------------------------------------------------------------------
 349  * Terminal and unit management
 350  */
 351
 352 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 353 {
 354         struct uvc_entity *entity;
 355
 356         list_for_each_entry(entity, &dev->entities, list) {
 357                 if (entity->id == id)
 358                         return entity;
 359         }
 360
 361         return NULL;
 362 }
 363
 364 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 365         int id, struct uvc_entity *entity)
 366 {
 367         unsigned int i;
 368
 369         if (entity == NULL)
 370                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 371
 372         list_for_each_entry_continue(entity, &dev->entities, list) {
 373                 for (i = 0; i < entity->bNrInPins; ++i)
 374                         if (entity->baSourceID[i] == id)
 375                                 return entity;
 376         }
 377
 378         return NULL;
 379 }
 380
 381 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 382 {
 383         struct uvc_streaming *stream;
 384
 385         list_for_each_entry(stream, &dev->streams, list) {
 386                 if (stream->header.bTerminalLink == id)
 387                         return stream;
 388         }
 389
 390         return NULL;
 391 }
 392
 393 /* ------------------------------------------------------------------------
 394  * Streaming Object Management
 395  */
 396
 397 static void uvc_stream_delete(struct uvc_streaming *stream)
 398 {
 399         if (stream->async_wq)
 400                 destroy_workqueue(stream->async_wq);
 401
 402         mutex_destroy(&stream->mutex);
 403
 404         usb_put_intf(stream->intf);
 405
 406         kfree(stream->format);
 407         kfree(stream->header.bmaControls);
 408         kfree(stream);
 409 }
 410
 411 static struct uvc_streaming *uvc_stream_new(struct uvc_device *dev,
 412                                             struct usb_interface *intf)
 413 {
 414         struct uvc_streaming *stream;
 415
 416         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 417         if (stream == NULL)
 418                 return NULL;
 419
 420         mutex_init(&stream->mutex);
 421
 422         stream->dev = dev;
 423         stream->intf = usb_get_intf(intf);
 424         stream->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 425
 426         /* Allocate a stream specific work queue for asynchronous tasks. */
 427         stream->async_wq = alloc_workqueue("uvcvideo", WQ_UNBOUND | WQ_HIGHPRI,
 428                                            0);
 429         if (!stream->async_wq) {
 430                 uvc_stream_delete(stream);
 431                 return NULL;
 432         }
 433
 434         return stream;
 435 }
 436
 437 /* ------------------------------------------------------------------------
 438  * Descriptors parsing
 439  */
 440
 441 static int uvc_parse_format(struct uvc_device *dev,
 442         struct uvc_streaming *streaming, struct uvc_format *format,
 443         u32 **intervals, unsigned char *buffer, int buflen)
 444 {
 445         struct usb_interface *intf = streaming->intf;
 446         struct usb_host_interface *alts = intf->cur_altsetting;
 447         struct uvc_format_desc *fmtdesc;
 448         struct uvc_frame *frame;
 449         const unsigned char *start = buffer;
 450         unsigned int width_multiplier = 1;
 451         unsigned int interval;
 452         unsigned int i, n;
 453         u8 ftype;
 454
 455         format->type = buffer[2];
 456         format->index = buffer[3];
 457
 458         switch (buffer[2]) {
 459         case UVC_VS_FORMAT_UNCOMPRESSED:
 460         case UVC_VS_FORMAT_FRAME_BASED:
 461                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 462                 if (buflen < n) {
 463                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 464                                "interface %d FORMAT error\n",
 465                                dev->udev->devnum,
 466                                alts->desc.bInterfaceNumber);
 467                         return -EINVAL;
 468                 }
 469
 470                 /* Find the format descriptor from its GUID. */
 471                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 472
 473                 if (fmtdesc != NULL) {
 474                         strscpy(format->name, fmtdesc->name,
 475                                 sizeof(format->name));
 476                         format->fcc = fmtdesc->fcc;
 477                 } else {
 478                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 479                                 &buffer[5]);
 480                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 481                                 &buffer[5]);
 482                         format->fcc = 0;
 483                 }
 484
 485                 format->bpp = buffer[21];
 486
 487                 /* Some devices report a format that doesn't match what they
 488                  * really send.
 489                  */
 490                 if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
 491                         if (format->fcc == V4L2_PIX_FMT_YUYV) {
 492                                 strscpy(format->name, "Greyscale 8-bit (Y8  )",
 493                                         sizeof(format->name));
 494                                 format->fcc = V4L2_PIX_FMT_GREY;
 495                                 format->bpp = 8;
 496                                 width_multiplier = 2;
 497                         }
 498                 }
 499
 500                 /* Some devices report bpp that doesn't match the format. */
 501                 if (dev->quirks & UVC_QUIRK_FORCE_BPP) {
 502                         const struct v4l2_format_info *info =
 503                                 v4l2_format_info(format->fcc);
 504
 505                         if (info) {
 506                                 unsigned int div = info->hdiv * info->vdiv;
 507
 508                                 n = info->bpp[0] * div;
 509                                 for (i = 1; i < info->comp_planes; i++)
 510                                         n += info->bpp[i];
 511
 512                                 format->bpp = DIV_ROUND_UP(8 * n, div);
 513                         }
 514                 }
 515
 516                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 517                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 518                 } else {
 519                         ftype = UVC_VS_FRAME_FRAME_BASED;
 520                         if (buffer[27])
 521                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 522                 }
 523                 break;
 524
 525         case UVC_VS_FORMAT_MJPEG:
 526                 if (buflen < 11) {
 527                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 528                                "interface %d FORMAT error\n",
 529                                dev->udev->devnum,
 530                                alts->desc.bInterfaceNumber);
 531                         return -EINVAL;
 532                 }
 533
 534                 strscpy(format->name, "MJPEG", sizeof(format->name));
 535                 format->fcc = V4L2_PIX_FMT_MJPEG;
 536                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 537                 format->bpp = 0;
 538                 ftype = UVC_VS_FRAME_MJPEG;
 539                 break;
 540
 541         case UVC_VS_FORMAT_DV:
 542                 if (buflen < 9) {
 543                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 544                                "interface %d FORMAT error\n",
 545                                dev->udev->devnum,
 546                                alts->desc.bInterfaceNumber);
 547                         return -EINVAL;
 548                 }
 549
 550                 switch (buffer[8] & 0x7f) {
 551                 case 0:
 552                         strscpy(format->name, "SD-DV", sizeof(format->name));
 553                         break;
 554                 case 1:
 555                         strscpy(format->name, "SDL-DV", sizeof(format->name));
 556                         break;
 557                 case 2:
 558                         strscpy(format->name, "HD-DV", sizeof(format->name));
 559                         break;
 560                 default:
 561                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 562                                "interface %d: unknown DV format %u\n",
 563                                dev->udev->devnum,
 564                                alts->desc.bInterfaceNumber, buffer[8]);
 565                         return -EINVAL;
 566                 }
 567
 568                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 569                         sizeof(format->name));
 570
 571                 format->fcc = V4L2_PIX_FMT_DV;
 572                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 573                 format->bpp = 0;
 574                 ftype = 0;
 575
 576                 /* Create a dummy frame descriptor. */
 577                 frame = &format->frame[0];
 578                 memset(&format->frame[0], 0, sizeof(format->frame[0]));
 579                 frame->bFrameIntervalType = 1;
 580                 frame->dwDefaultFrameInterval = 1;
 581                 frame->dwFrameInterval = *intervals;
 582                 *(*intervals)++ = 1;
 583                 format->nframes = 1;
 584                 break;
 585
 586         case UVC_VS_FORMAT_MPEG2TS:
 587         case UVC_VS_FORMAT_STREAM_BASED:
 588                 /* Not supported yet. */
 589         default:
 590                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 591                        "interface %d unsupported format %u\n",
 592                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 593                        buffer[2]);
 594                 return -EINVAL;
 595         }
 596
 597         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 598
 599         buflen -= buffer[0];
 600         buffer += buffer[0];
 601
 602         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 603          * based formats have frame descriptors.
 604          */
 605         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 606                buffer[2] == ftype) {
 607                 frame = &format->frame[format->nframes];
 608                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 609                         n = buflen > 25 ? buffer[25] : 0;
 610                 else
 611                         n = buflen > 21 ? buffer[21] : 0;
 612
 613                 n = n ? n : 3;
 614
 615                 if (buflen < 26 + 4*n) {
 616                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 617                                "interface %d FRAME error\n", dev->udev->devnum,
 618                                alts->desc.bInterfaceNumber);
 619                         return -EINVAL;
 620                 }
 621
 622                 frame->bFrameIndex = buffer[3];
 623                 frame->bmCapabilities = buffer[4];
 624                 frame->wWidth = get_unaligned_le16(&buffer[5])
 625                               * width_multiplier;
 626                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 627                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 628                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 629                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 630                         frame->dwMaxVideoFrameBufferSize =
 631                                 get_unaligned_le32(&buffer[17]);
 632                         frame->dwDefaultFrameInterval =
 633                                 get_unaligned_le32(&buffer[21]);
 634                         frame->bFrameIntervalType = buffer[25];
 635                 } else {
 636                         frame->dwMaxVideoFrameBufferSize = 0;
 637                         frame->dwDefaultFrameInterval =
 638                                 get_unaligned_le32(&buffer[17]);
 639                         frame->bFrameIntervalType = buffer[21];
 640                 }
 641                 frame->dwFrameInterval = *intervals;
 642
 643                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 644                  * completely. Observed behaviours range from setting the
 645                  * value to 1.1x the actual frame size to hardwiring the
 646                  * 16 low bits to 0. This results in a higher than necessary
 647                  * memory usage as well as a wrong image size information. For
 648                  * uncompressed formats this can be fixed by computing the
 649                  * value from the frame size.
 650                  */
 651                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 652                         frame->dwMaxVideoFrameBufferSize = format->bpp
 653                                 * frame->wWidth * frame->wHeight / 8;
 654
 655                 /* Some bogus devices report dwMinFrameInterval equal to
 656                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 657                  * zero. Setting all null intervals to 1 fixes the problem and
 658                  * some other divisions by zero that could happen.
 659                  */
 660                 for (i = 0; i < n; ++i) {
 661                         interval = get_unaligned_le32(&buffer[26+4*i]);
 662                         *(*intervals)++ = interval ? interval : 1;
 663                 }
 664
 665                 /* Make sure that the default frame interval stays between
 666                  * the boundaries.
 667                  */
 668                 n -= frame->bFrameIntervalType ? 1 : 2;
 669                 frame->dwDefaultFrameInterval =
 670                         min(frame->dwFrameInterval[n],
 671                             max(frame->dwFrameInterval[0],
 672                                 frame->dwDefaultFrameInterval));
 673
 674                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 675                         frame->bFrameIntervalType = 1;
 676                         frame->dwFrameInterval[0] =
 677                                 frame->dwDefaultFrameInterval;
 678                 }
 679
 680                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 681                         frame->wWidth, frame->wHeight,
 682                         10000000/frame->dwDefaultFrameInterval,
 683                         (100000000/frame->dwDefaultFrameInterval)%10);
 684
 685                 format->nframes++;
 686                 buflen -= buffer[0];
 687                 buffer += buffer[0];
 688         }
 689
 690         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 691             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 692                 buflen -= buffer[0];
 693                 buffer += buffer[0];
 694         }
 695
 696         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 697             buffer[2] == UVC_VS_COLORFORMAT) {
 698                 if (buflen < 6) {
 699                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 700                                "interface %d COLORFORMAT error\n",
 701                                dev->udev->devnum,
 702                                alts->desc.bInterfaceNumber);
 703                         return -EINVAL;
 704                 }
 705
 706                 format->colorspace = uvc_colorspace(buffer[3]);
 707
 708                 buflen -= buffer[0];
 709                 buffer += buffer[0];
 710         }
 711
 712         return buffer - start;
 713 }
 714
 715 static int uvc_parse_streaming(struct uvc_device *dev,
 716         struct usb_interface *intf)
 717 {
 718         struct uvc_streaming *streaming = NULL;
 719         struct uvc_format *format;
 720         struct uvc_frame *frame;
 721         struct usb_host_interface *alts = &intf->altsetting[0];
 722         unsigned char *_buffer, *buffer = alts->extra;
 723         int _buflen, buflen = alts->extralen;
 724         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 725         unsigned int size, i, n, p;
 726         u32 *interval;
 727         u16 psize;
 728         int ret = -EINVAL;
 729
 730         if (intf->cur_altsetting->desc.bInterfaceSubClass
 731                 != UVC_SC_VIDEOSTREAMING) {
 732                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 733                         "video streaming interface\n", dev->udev->devnum,
 734                         intf->altsetting[0].desc.bInterfaceNumber);
 735                 return -EINVAL;
 736         }
 737
 738         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 739                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 740                         "claimed\n", dev->udev->devnum,
 741                         intf->altsetting[0].desc.bInterfaceNumber);
 742                 return -EINVAL;
 743         }
 744
 745         streaming = uvc_stream_new(dev, intf);
 746         if (streaming == NULL) {
 747                 usb_driver_release_interface(&uvc_driver.driver, intf);
 748                 return -ENOMEM;
 749         }
 750
 751         /* The Pico iMage webcam has its class-specific interface descriptors
 752          * after the endpoint descriptors.
 753          */
 754         if (buflen == 0) {
 755                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 756                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 757
 758                         if (ep->extralen == 0)
 759                                 continue;
 760
 761                         if (ep->extralen > 2 &&
 762                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 763                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 764                                         "from endpoint %u.\n", i);
 765                                 buffer = alts->endpoint[i].extra;
 766                                 buflen = alts->endpoint[i].extralen;
 767                                 break;
 768                         }
 769                 }
 770         }
 771
 772         /* Skip the standard interface descriptors. */
 773         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 774                 buflen -= buffer[0];
 775                 buffer += buffer[0];
 776         }
 777
 778         if (buflen <= 2) {
 779                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 780                         "interface descriptors found.\n");
 781                 goto error;
 782         }
 783
 784         /* Parse the header descriptor. */
 785         switch (buffer[2]) {
 786         case UVC_VS_OUTPUT_HEADER:
 787                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 788                 size = 9;
 789                 break;
 790
 791         case UVC_VS_INPUT_HEADER:
 792                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 793                 size = 13;
 794                 break;
 795
 796         default:
 797                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 798                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 799                         alts->desc.bInterfaceNumber);
 800                 goto error;
 801         }
 802
 803         p = buflen >= 4 ? buffer[3] : 0;
 804         n = buflen >= size ? buffer[size-1] : 0;
 805
 806         if (buflen < size + p*n) {
 807                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 808                         "interface %d HEADER descriptor is invalid.\n",
 809                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 810                 goto error;
 811         }
 812
 813         streaming->header.bNumFormats = p;
 814         streaming->header.bEndpointAddress = buffer[6];
 815         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 816                 streaming->header.bmInfo = buffer[7];
 817                 streaming->header.bTerminalLink = buffer[8];
 818                 streaming->header.bStillCaptureMethod = buffer[9];
 819                 streaming->header.bTriggerSupport = buffer[10];
 820                 streaming->header.bTriggerUsage = buffer[11];
 821         } else {
 822                 streaming->header.bTerminalLink = buffer[7];
 823         }
 824         streaming->header.bControlSize = n;
 825
 826         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 827                                                 GFP_KERNEL);
 828         if (streaming->header.bmaControls == NULL) {
 829                 ret = -ENOMEM;
 830                 goto error;
 831         }
 832
 833         buflen -= buffer[0];
 834         buffer += buffer[0];
 835
 836         _buffer = buffer;
 837         _buflen = buflen;
 838
 839         /* Count the format and frame descriptors. */
 840         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 841                 switch (_buffer[2]) {
 842                 case UVC_VS_FORMAT_UNCOMPRESSED:
 843                 case UVC_VS_FORMAT_MJPEG:
 844                 case UVC_VS_FORMAT_FRAME_BASED:
 845                         nformats++;
 846                         break;
 847
 848                 case UVC_VS_FORMAT_DV:
 849                         /* DV format has no frame descriptor. We will create a
 850                          * dummy frame descriptor with a dummy frame interval.
 851                          */
 852                         nformats++;
 853                         nframes++;
 854                         nintervals++;
 855                         break;
 856
 857                 case UVC_VS_FORMAT_MPEG2TS:
 858                 case UVC_VS_FORMAT_STREAM_BASED:
 859                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 860                                 "interface %d FORMAT %u is not supported.\n",
 861                                 dev->udev->devnum,
 862                                 alts->desc.bInterfaceNumber, _buffer[2]);
 863                         break;
 864
 865                 case UVC_VS_FRAME_UNCOMPRESSED:
 866                 case UVC_VS_FRAME_MJPEG:
 867                         nframes++;
 868                         if (_buflen > 25)
 869                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 870                         break;
 871
 872                 case UVC_VS_FRAME_FRAME_BASED:
 873                         nframes++;
 874                         if (_buflen > 21)
 875                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 876                         break;
 877                 }
 878
 879                 _buflen -= _buffer[0];
 880                 _buffer += _buffer[0];
 881         }
 882
 883         if (nformats == 0) {
 884                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 885                         "%d has no supported formats defined.\n",
 886                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 887                 goto error;
 888         }
 889
 890         size = nformats * sizeof(*format) + nframes * sizeof(*frame)
 891              + nintervals * sizeof(*interval);
 892         format = kzalloc(size, GFP_KERNEL);
 893         if (format == NULL) {
 894                 ret = -ENOMEM;
 895                 goto error;
 896         }
 897
 898         frame = (struct uvc_frame *)&format[nformats];
 899         interval = (u32 *)&frame[nframes];
 900
 901         streaming->format = format;
 902         streaming->nformats = nformats;
 903
 904         /* Parse the format descriptors. */
 905         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 906                 switch (buffer[2]) {
 907                 case UVC_VS_FORMAT_UNCOMPRESSED:
 908                 case UVC_VS_FORMAT_MJPEG:
 909                 case UVC_VS_FORMAT_DV:
 910                 case UVC_VS_FORMAT_FRAME_BASED:
 911                         format->frame = frame;
 912                         ret = uvc_parse_format(dev, streaming, format,
 913                                 &interval, buffer, buflen);
 914                         if (ret < 0)
 915                                 goto error;
 916
 917                         frame += format->nframes;
 918                         format++;
 919
 920                         buflen -= ret;
 921                         buffer += ret;
 922                         continue;
 923
 924                 default:
 925                         break;
 926                 }
 927
 928                 buflen -= buffer[0];
 929                 buffer += buffer[0];
 930         }
 931
 932         if (buflen)
 933                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 934                         "%d has %u bytes of trailing descriptor garbage.\n",
 935                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 936
 937         /* Parse the alternate settings to find the maximum bandwidth. */
 938         for (i = 0; i < intf->num_altsetting; ++i) {
 939                 struct usb_host_endpoint *ep;
 940                 alts = &intf->altsetting[i];
 941                 ep = uvc_find_endpoint(alts,
 942                                 streaming->header.bEndpointAddress);
 943                 if (ep == NULL)
 944                         continue;
 945
 946                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 947                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 948                 if (psize > streaming->maxpsize)
 949                         streaming->maxpsize = psize;
 950         }
 951
 952         list_add_tail(&streaming->list, &dev->streams);
 953         return 0;
 954
 955 error:
 956         usb_driver_release_interface(&uvc_driver.driver, intf);
 957         uvc_stream_delete(streaming);
 958         return ret;
 959 }
 960
 961 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 962                 unsigned int num_pads, unsigned int extra_size)
 963 {
 964         struct uvc_entity *entity;
 965         unsigned int num_inputs;
 966         unsigned int size;
 967         unsigned int i;
 968
 969         extra_size = roundup(extra_size, sizeof(*entity->pads));
 970         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 971         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 972              + num_inputs;
 973         entity = kzalloc(size, GFP_KERNEL);
 974         if (entity == NULL)
 975                 return NULL;
 976
 977         entity->id = id;
 978         entity->type = type;
 979
 980         entity->num_links = 0;
 981         entity->num_pads = num_pads;
 982         entity->pads = ((void *)(entity + 1)) + extra_size;
 983
 984         for (i = 0; i < num_inputs; ++i)
 985                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 986         if (!UVC_ENTITY_IS_OTERM(entity))
 987                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 988
 989         entity->bNrInPins = num_inputs;
 990         entity->baSourceID = (u8 *)(&entity->pads[num_pads]);
 991
 992         return entity;
 993 }
 994
 995 /* Parse vendor-specific extensions. */
 996 static int uvc_parse_vendor_control(struct uvc_device *dev,
 997         const unsigned char *buffer, int buflen)
 998 {
 999         struct usb_device *udev = dev->udev;
1000         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1001         struct uvc_entity *unit;
1002         unsigned int n, p;
1003         int handled = 0;
1004
1005         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
1006         case 0x046d:            /* Logitech */
1007                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
1008                         break;
1009
1010                 /* Logitech implements several vendor specific functions
1011                  * through vendor specific extension units (LXU).
1012                  *
1013                  * The LXU descriptors are similar to XU descriptors
1014                  * (see "USB Device Video Class for Video Devices", section
1015                  * 3.7.2.6 "Extension Unit Descriptor") with the following
1016                  * differences:
1017                  *
1018                  * ----------------------------------------------------------
1019                  * 0            bLength         1        Number
1020                  *      Size of this descriptor, in bytes: 24+p+n*2
1021                  * ----------------------------------------------------------
1022                  * 23+p+n       bmControlsType  N       Bitmap
1023                  *      Individual bits in the set are defined:
1024                  *      0: Absolute
1025                  *      1: Relative
1026                  *
1027                  *      This bitset is mapped exactly the same as bmControls.
1028                  * ----------------------------------------------------------
1029                  * 23+p+n*2     bReserved       1       Boolean
1030                  * ----------------------------------------------------------
1031                  * 24+p+n*2     iExtension      1       Index
1032                  *      Index of a string descriptor that describes this
1033                  *      extension unit.
1034                  * ----------------------------------------------------------
1035                  */
1036                 p = buflen >= 22 ? buffer[21] : 0;
1037                 n = buflen >= 25 + p ? buffer[22+p] : 0;
1038
1039                 if (buflen < 25 + p + 2*n) {
1040                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1041                                 "interface %d EXTENSION_UNIT error\n",
1042                                 udev->devnum, alts->desc.bInterfaceNumber);
1043                         break;
1044                 }
1045
1046                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
1047                                         p + 1, 2*n);
1048                 if (unit == NULL)
1049                         return -ENOMEM;
1050
1051                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1052                 unit->extension.bNumControls = buffer[20];
1053                 memcpy(unit->baSourceID, &buffer[22], p);
1054                 unit->extension.bControlSize = buffer[22+p];
1055                 unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
1056                 unit->extension.bmControlsType = (u8 *)unit + sizeof(*unit)
1057                                                + n;
1058                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
1059
1060                 if (buffer[24+p+2*n] != 0)
1061                         usb_string(udev, buffer[24+p+2*n], unit->name,
1062                                    sizeof(unit->name));
1063                 else
1064                         sprintf(unit->name, "Extension %u", buffer[3]);
1065
1066                 list_add_tail(&unit->list, &dev->entities);
1067                 handled = 1;
1068                 break;
1069         }
1070
1071         return handled;
1072 }
1073
1074 static int uvc_parse_standard_control(struct uvc_device *dev,
1075         const unsigned char *buffer, int buflen)
1076 {
1077         struct usb_device *udev = dev->udev;
1078         struct uvc_entity *unit, *term;
1079         struct usb_interface *intf;
1080         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1081         unsigned int i, n, p, len;
1082         u16 type;
1083
1084         switch (buffer[2]) {
1085         case UVC_VC_HEADER:
1086                 n = buflen >= 12 ? buffer[11] : 0;
1087
1088                 if (buflen < 12 + n) {
1089                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1090                                 "interface %d HEADER error\n", udev->devnum,
1091                                 alts->desc.bInterfaceNumber);
1092                         return -EINVAL;
1093                 }
1094
1095                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
1096                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
1097
1098                 /* Parse all USB Video Streaming interfaces. */
1099                 for (i = 0; i < n; ++i) {
1100                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
1101                         if (intf == NULL) {
1102                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
1103                                         "interface %d doesn't exists\n",
1104                                         udev->devnum, i);
1105                                 continue;
1106                         }
1107
1108                         uvc_parse_streaming(dev, intf);
1109                 }
1110                 break;
1111
1112         case UVC_VC_INPUT_TERMINAL:
1113                 if (buflen < 8) {
1114                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1115                                 "interface %d INPUT_TERMINAL error\n",
1116                                 udev->devnum, alts->desc.bInterfaceNumber);
1117                         return -EINVAL;
1118                 }
1119
1120                 /*
1121                  * Reject invalid terminal types that would cause issues:
1122                  *
1123                  * - The high byte must be non-zero, otherwise it would be
1124                  *   confused with a unit.
1125                  *
1126                  * - Bit 15 must be 0, as we use it internally as a terminal
1127                  *   direction flag.
1128                  *
1129                  * Other unknown types are accepted.
1130                  */
1131                 type = get_unaligned_le16(&buffer[4]);
1132                 if ((type & 0x7f00) == 0 || (type & 0x8000) != 0) {
1133                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1134                                 "interface %d INPUT_TERMINAL %d has invalid "
1135                                 "type 0x%04x, skipping\n", udev->devnum,
1136                                 alts->desc.bInterfaceNumber,
1137                                 buffer[3], type);
1138                         return 0;
1139                 }
1140
1141                 n = 0;
1142                 p = 0;
1143                 len = 8;
1144
1145                 if (type == UVC_ITT_CAMERA) {
1146                         n = buflen >= 15 ? buffer[14] : 0;
1147                         len = 15;
1148
1149                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1150                         n = buflen >= 9 ? buffer[8] : 0;
1151                         p = buflen >= 10 + n ? buffer[9+n] : 0;
1152                         len = 10;
1153                 }
1154
1155                 if (buflen < len + n + p) {
1156                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1157                                 "interface %d INPUT_TERMINAL error\n",
1158                                 udev->devnum, alts->desc.bInterfaceNumber);
1159                         return -EINVAL;
1160                 }
1161
1162                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
1163                                         1, n + p);
1164                 if (term == NULL)
1165                         return -ENOMEM;
1166
1167                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1168                         term->camera.bControlSize = n;
1169                         term->camera.bmControls = (u8 *)term + sizeof(*term);
1170                         term->camera.wObjectiveFocalLengthMin =
1171                                 get_unaligned_le16(&buffer[8]);
1172                         term->camera.wObjectiveFocalLengthMax =
1173                                 get_unaligned_le16(&buffer[10]);
1174                         term->camera.wOcularFocalLength =
1175                                 get_unaligned_le16(&buffer[12]);
1176                         memcpy(term->camera.bmControls, &buffer[15], n);
1177                 } else if (UVC_ENTITY_TYPE(term) ==
1178                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1179                         term->media.bControlSize = n;
1180                         term->media.bmControls = (u8 *)term + sizeof(*term);
1181                         term->media.bTransportModeSize = p;
1182                         term->media.bmTransportModes = (u8 *)term
1183                                                      + sizeof(*term) + n;
1184                         memcpy(term->media.bmControls, &buffer[9], n);
1185                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1186                 }
1187
1188                 if (buffer[7] != 0)
1189                         usb_string(udev, buffer[7], term->name,
1190                                    sizeof(term->name));
1191                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1192                         sprintf(term->name, "Camera %u", buffer[3]);
1193                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1194                         sprintf(term->name, "Media %u", buffer[3]);
1195                 else
1196                         sprintf(term->name, "Input %u", buffer[3]);
1197
1198                 list_add_tail(&term->list, &dev->entities);
1199                 break;
1200
1201         case UVC_VC_OUTPUT_TERMINAL:
1202                 if (buflen < 9) {
1203                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1204                                 "interface %d OUTPUT_TERMINAL error\n",
1205                                 udev->devnum, alts->desc.bInterfaceNumber);
1206                         return -EINVAL;
1207                 }
1208
1209                 /* Make sure the terminal type MSB is not null, otherwise it
1210                  * could be confused with a unit.
1211                  */
1212                 type = get_unaligned_le16(&buffer[4]);
1213                 if ((type & 0xff00) == 0) {
1214                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1215                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1216                                 "type 0x%04x, skipping\n", udev->devnum,
1217                                 alts->desc.bInterfaceNumber, buffer[3], type);
1218                         return 0;
1219                 }
1220
1221                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1222                                         1, 0);
1223                 if (term == NULL)
1224                         return -ENOMEM;
1225
1226                 memcpy(term->baSourceID, &buffer[7], 1);
1227
1228                 if (buffer[8] != 0)
1229                         usb_string(udev, buffer[8], term->name,
1230                                    sizeof(term->name));
1231                 else
1232                         sprintf(term->name, "Output %u", buffer[3]);
1233
1234                 list_add_tail(&term->list, &dev->entities);
1235                 break;
1236
1237         case UVC_VC_SELECTOR_UNIT:
1238                 p = buflen >= 5 ? buffer[4] : 0;
1239
1240                 if (buflen < 5 || buflen < 6 + p) {
1241                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1242                                 "interface %d SELECTOR_UNIT error\n",
1243                                 udev->devnum, alts->desc.bInterfaceNumber);
1244                         return -EINVAL;
1245                 }
1246
1247                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1248                 if (unit == NULL)
1249                         return -ENOMEM;
1250
1251                 memcpy(unit->baSourceID, &buffer[5], p);
1252
1253                 if (buffer[5+p] != 0)
1254                         usb_string(udev, buffer[5+p], unit->name,
1255                                    sizeof(unit->name));
1256                 else
1257                         sprintf(unit->name, "Selector %u", buffer[3]);
1258
1259                 list_add_tail(&unit->list, &dev->entities);
1260                 break;
1261
1262         case UVC_VC_PROCESSING_UNIT:
1263                 n = buflen >= 8 ? buffer[7] : 0;
1264                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1265
1266                 if (buflen < p + n) {
1267                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1268                                 "interface %d PROCESSING_UNIT error\n",
1269                                 udev->devnum, alts->desc.bInterfaceNumber);
1270                         return -EINVAL;
1271                 }
1272
1273                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1274                 if (unit == NULL)
1275                         return -ENOMEM;
1276
1277                 memcpy(unit->baSourceID, &buffer[4], 1);
1278                 unit->processing.wMaxMultiplier =
1279                         get_unaligned_le16(&buffer[5]);
1280                 unit->processing.bControlSize = buffer[7];
1281                 unit->processing.bmControls = (u8 *)unit + sizeof(*unit);
1282                 memcpy(unit->processing.bmControls, &buffer[8], n);
1283                 if (dev->uvc_version >= 0x0110)
1284                         unit->processing.bmVideoStandards = buffer[9+n];
1285
1286                 if (buffer[8+n] != 0)
1287                         usb_string(udev, buffer[8+n], unit->name,
1288                                    sizeof(unit->name));
1289                 else
1290                         sprintf(unit->name, "Processing %u", buffer[3]);
1291
1292                 list_add_tail(&unit->list, &dev->entities);
1293                 break;
1294
1295         case UVC_VC_EXTENSION_UNIT:
1296                 p = buflen >= 22 ? buffer[21] : 0;
1297                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1298
1299                 if (buflen < 24 + p + n) {
1300                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1301                                 "interface %d EXTENSION_UNIT error\n",
1302                                 udev->devnum, alts->desc.bInterfaceNumber);
1303                         return -EINVAL;
1304                 }
1305
1306                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1307                 if (unit == NULL)
1308                         return -ENOMEM;
1309
1310                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1311                 unit->extension.bNumControls = buffer[20];
1312                 memcpy(unit->baSourceID, &buffer[22], p);
1313                 unit->extension.bControlSize = buffer[22+p];
1314                 unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
1315                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1316
1317                 if (buffer[23+p+n] != 0)
1318                         usb_string(udev, buffer[23+p+n], unit->name,
1319                                    sizeof(unit->name));
1320                 else
1321                         sprintf(unit->name, "Extension %u", buffer[3]);
1322
1323                 list_add_tail(&unit->list, &dev->entities);
1324                 break;
1325
1326         default:
1327                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1328                         "descriptor (%u)\n", buffer[2]);
1329                 break;
1330         }
1331
1332         return 0;
1333 }
1334
1335 static int uvc_parse_control(struct uvc_device *dev)
1336 {
1337         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1338         unsigned char *buffer = alts->extra;
1339         int buflen = alts->extralen;
1340         int ret;
1341
1342         /* Parse the default alternate setting only, as the UVC specification
1343          * defines a single alternate setting, the default alternate setting
1344          * zero.
1345          */
1346
1347         while (buflen > 2) {
1348                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1349                     buffer[1] != USB_DT_CS_INTERFACE)
1350                         goto next_descriptor;
1351
1352                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1353                         return ret;
1354
1355 next_descriptor:
1356                 buflen -= buffer[0];
1357                 buffer += buffer[0];
1358         }
1359
1360         /* Check if the optional status endpoint is present. Built-in iSight
1361          * webcams have an interrupt endpoint but spit proprietary data that
1362          * don't conform to the UVC status endpoint messages. Don't try to
1363          * handle the interrupt endpoint for those cameras.
1364          */
1365         if (alts->desc.bNumEndpoints == 1 &&
1366             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1367                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1368                 struct usb_endpoint_descriptor *desc = &ep->desc;
1369
1370                 if (usb_endpoint_is_int_in(desc) &&
1371                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1372                     desc->bInterval != 0) {
1373                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1374                                 "(addr %02x).\n", desc->bEndpointAddress);
1375                         dev->int_ep = ep;
1376                 }
1377         }
1378
1379         return 0;
1380 }
1381
1382 /* ------------------------------------------------------------------------
1383  * UVC device scan
1384  */
1385
1386 /*
1387  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1388  * and containing the following units:
1389  *
1390  * - one or more Output Terminals (USB Streaming or Display)
1391  * - zero or one Processing Unit
1392  * - zero, one or more single-input Selector Units
1393  * - zero or one multiple-input Selector Units, provided all inputs are
1394  *   connected to input terminals
1395  * - zero, one or mode single-input Extension Units
1396  * - one or more Input Terminals (Camera, External or USB Streaming)
1397  *
1398  * The terminal and units must match on of the following structures:
1399  *
1400  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1401  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1402  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1403  *
1404  *                 +---------+    +---------+ -> OTT_*(0)
1405  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1406  *                 +---------+    +---------+ -> OTT_*(n)
1407  *
1408  * The Processing Unit and Extension Units can be in any order. Additional
1409  * Extension Units connected to the main chain as single-unit branches are
1410  * also supported. Single-input Selector Units are ignored.
1411  */
1412 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1413         struct uvc_entity *entity)
1414 {
1415         switch (UVC_ENTITY_TYPE(entity)) {
1416         case UVC_VC_EXTENSION_UNIT:
1417                 if (uvc_trace_param & UVC_TRACE_PROBE)
1418                         printk(KERN_CONT " <- XU %d", entity->id);
1419
1420                 if (entity->bNrInPins != 1) {
1421                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1422                                 "than 1 input pin.\n", entity->id);
1423                         return -1;
1424                 }
1425
1426                 break;
1427
1428         case UVC_VC_PROCESSING_UNIT:
1429                 if (uvc_trace_param & UVC_TRACE_PROBE)
1430                         printk(KERN_CONT " <- PU %d", entity->id);
1431
1432                 if (chain->processing != NULL) {
1433                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1434                                 "Processing Units in chain.\n");
1435                         return -1;
1436                 }
1437
1438                 chain->processing = entity;
1439                 break;
1440
1441         case UVC_VC_SELECTOR_UNIT:
1442                 if (uvc_trace_param & UVC_TRACE_PROBE)
1443                         printk(KERN_CONT " <- SU %d", entity->id);
1444
1445                 /* Single-input selector units are ignored. */
1446                 if (entity->bNrInPins == 1)
1447                         break;
1448
1449                 if (chain->selector != NULL) {
1450                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1451                                 "Units in chain.\n");
1452                         return -1;
1453                 }
1454
1455                 chain->selector = entity;
1456                 break;
1457
1458         case UVC_ITT_VENDOR_SPECIFIC:
1459         case UVC_ITT_CAMERA:
1460         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1461                 if (uvc_trace_param & UVC_TRACE_PROBE)
1462                         printk(KERN_CONT " <- IT %d\n", entity->id);
1463
1464                 break;
1465
1466         case UVC_OTT_VENDOR_SPECIFIC:
1467         case UVC_OTT_DISPLAY:
1468         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1469                 if (uvc_trace_param & UVC_TRACE_PROBE)
1470                         printk(KERN_CONT " OT %d", entity->id);
1471
1472                 break;
1473
1474         case UVC_TT_STREAMING:
1475                 if (UVC_ENTITY_IS_ITERM(entity)) {
1476                         if (uvc_trace_param & UVC_TRACE_PROBE)
1477                                 printk(KERN_CONT " <- IT %d\n", entity->id);
1478                 } else {
1479                         if (uvc_trace_param & UVC_TRACE_PROBE)
1480                                 printk(KERN_CONT " OT %d", entity->id);
1481                 }
1482
1483                 break;
1484
1485         default:
1486                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1487                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1488                 return -1;
1489         }
1490
1491         list_add_tail(&entity->chain, &chain->entities);
1492         return 0;
1493 }
1494
1495 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1496         struct uvc_entity *entity, struct uvc_entity *prev)
1497 {
1498         struct uvc_entity *forward;
1499         int found;
1500
1501         /* Forward scan */
1502         forward = NULL;
1503         found = 0;
1504
1505         while (1) {
1506                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1507                         forward);
1508                 if (forward == NULL)
1509                         break;
1510                 if (forward == prev)
1511                         continue;
1512                 if (forward->chain.next || forward->chain.prev) {
1513                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1514                                 "entity %d already in chain.\n", forward->id);
1515                         return -EINVAL;
1516                 }
1517
1518                 switch (UVC_ENTITY_TYPE(forward)) {
1519                 case UVC_VC_EXTENSION_UNIT:
1520                         if (forward->bNrInPins != 1) {
1521                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1522                                           "has more than 1 input pin.\n",
1523                                           entity->id);
1524                                 return -EINVAL;
1525                         }
1526
1527                         list_add_tail(&forward->chain, &chain->entities);
1528                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1529                                 if (!found)
1530                                         printk(KERN_CONT " (->");
1531
1532                                 printk(KERN_CONT " XU %d", forward->id);
1533                                 found = 1;
1534                         }
1535                         break;
1536
1537                 case UVC_OTT_VENDOR_SPECIFIC:
1538                 case UVC_OTT_DISPLAY:
1539                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1540                 case UVC_TT_STREAMING:
1541                         if (UVC_ENTITY_IS_ITERM(forward)) {
1542                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1543                                         "terminal %u.\n", forward->id);
1544                                 return -EINVAL;
1545                         }
1546
1547                         list_add_tail(&forward->chain, &chain->entities);
1548                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1549                                 if (!found)
1550                                         printk(KERN_CONT " (->");
1551
1552                                 printk(KERN_CONT " OT %d", forward->id);
1553                                 found = 1;
1554                         }
1555                         break;
1556                 }
1557         }
1558         if (found)
1559                 printk(KERN_CONT ")");
1560
1561         return 0;
1562 }
1563
1564 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1565         struct uvc_entity **_entity)
1566 {
1567         struct uvc_entity *entity = *_entity;
1568         struct uvc_entity *term;
1569         int id = -EINVAL, i;
1570
1571         switch (UVC_ENTITY_TYPE(entity)) {
1572         case UVC_VC_EXTENSION_UNIT:
1573         case UVC_VC_PROCESSING_UNIT:
1574                 id = entity->baSourceID[0];
1575                 break;
1576
1577         case UVC_VC_SELECTOR_UNIT:
1578                 /* Single-input selector units are ignored. */
1579                 if (entity->bNrInPins == 1) {
1580                         id = entity->baSourceID[0];
1581                         break;
1582                 }
1583
1584                 if (uvc_trace_param & UVC_TRACE_PROBE)
1585                         printk(KERN_CONT " <- IT");
1586
1587                 chain->selector = entity;
1588                 for (i = 0; i < entity->bNrInPins; ++i) {
1589                         id = entity->baSourceID[i];
1590                         term = uvc_entity_by_id(chain->dev, id);
1591                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1592                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1593                                         "input %d isn't connected to an "
1594                                         "input terminal\n", entity->id, i);
1595                                 return -1;
1596                         }
1597
1598                         if (term->chain.next || term->chain.prev) {
1599                                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1600                                         "entity %d already in chain.\n",
1601                                         term->id);
1602                                 return -EINVAL;
1603                         }
1604
1605                         if (uvc_trace_param & UVC_TRACE_PROBE)
1606                                 printk(KERN_CONT " %d", term->id);
1607
1608                         list_add_tail(&term->chain, &chain->entities);
1609                         uvc_scan_chain_forward(chain, term, entity);
1610                 }
1611
1612                 if (uvc_trace_param & UVC_TRACE_PROBE)
1613                         printk(KERN_CONT "\n");
1614
1615                 id = 0;
1616                 break;
1617
1618         case UVC_ITT_VENDOR_SPECIFIC:
1619         case UVC_ITT_CAMERA:
1620         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1621         case UVC_OTT_VENDOR_SPECIFIC:
1622         case UVC_OTT_DISPLAY:
1623         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1624         case UVC_TT_STREAMING:
1625                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1626                 break;
1627         }
1628
1629         if (id <= 0) {
1630                 *_entity = NULL;
1631                 return id;
1632         }
1633
1634         entity = uvc_entity_by_id(chain->dev, id);
1635         if (entity == NULL) {
1636                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1637                         "unknown entity %d.\n", id);
1638                 return -EINVAL;
1639         }
1640
1641         *_entity = entity;
1642         return 0;
1643 }
1644
1645 static int uvc_scan_chain(struct uvc_video_chain *chain,
1646                           struct uvc_entity *term)
1647 {
1648         struct uvc_entity *entity, *prev;
1649
1650         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1651
1652         entity = term;
1653         prev = NULL;
1654
1655         while (entity != NULL) {
1656                 /* Entity must not be part of an existing chain */
1657                 if (entity->chain.next || entity->chain.prev) {
1658                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1659                                 "entity %d already in chain.\n", entity->id);
1660                         return -EINVAL;
1661                 }
1662
1663                 /* Process entity */
1664                 if (uvc_scan_chain_entity(chain, entity) < 0)
1665                         return -EINVAL;
1666
1667                 /* Forward scan */
1668                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1669                         return -EINVAL;
1670
1671                 /* Backward scan */
1672                 prev = entity;
1673                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1674                         return -EINVAL;
1675         }
1676
1677         return 0;
1678 }
1679
1680 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1681                 char *buffer)
1682 {
1683         struct uvc_entity *term;
1684         unsigned int nterms = 0;
1685         char *p = buffer;
1686
1687         list_for_each_entry(term, terms, chain) {
1688                 if (!UVC_ENTITY_IS_TERM(term) ||
1689                     UVC_TERM_DIRECTION(term) != dir)
1690                         continue;
1691
1692                 if (nterms)
1693                         p += sprintf(p, ",");
1694                 if (++nterms >= 4) {
1695                         p += sprintf(p, "...");
1696                         break;
1697                 }
1698                 p += sprintf(p, "%u", term->id);
1699         }
1700
1701         return p - buffer;
1702 }
1703
1704 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1705 {
1706         static char buffer[43];
1707         char *p = buffer;
1708
1709         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1710         p += sprintf(p, " -> ");
1711         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1712
1713         return buffer;
1714 }
1715
1716 static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev)
1717 {
1718         struct uvc_video_chain *chain;
1719
1720         chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1721         if (chain == NULL)
1722                 return NULL;
1723
1724         INIT_LIST_HEAD(&chain->entities);
1725         mutex_init(&chain->ctrl_mutex);
1726         chain->dev = dev;
1727         v4l2_prio_init(&chain->prio);
1728
1729         return chain;
1730 }
1731
1732 /*
1733  * Fallback heuristic for devices that don't connect units and terminals in a
1734  * valid chain.
1735  *
1736  * Some devices have invalid baSourceID references, causing uvc_scan_chain()
1737  * to fail, but if we just take the entities we can find and put them together
1738  * in the most sensible chain we can think of, turns out they do work anyway.
1739  * Note: This heuristic assumes there is a single chain.
1740  *
1741  * At the time of writing, devices known to have such a broken chain are
1742  *  - Acer Integrated Camera (5986:055a)
1743  *  - Realtek rtl157a7 (0bda:57a7)
1744  */
1745 static int uvc_scan_fallback(struct uvc_device *dev)
1746 {
1747         struct uvc_video_chain *chain;
1748         struct uvc_entity *iterm = NULL;
1749         struct uvc_entity *oterm = NULL;
1750         struct uvc_entity *entity;
1751         struct uvc_entity *prev;
1752
1753         /*
1754          * Start by locating the input and output terminals. We only support
1755          * devices with exactly one of each for now.
1756          */
1757         list_for_each_entry(entity, &dev->entities, list) {
1758                 if (UVC_ENTITY_IS_ITERM(entity)) {
1759                         if (iterm)
1760                                 return -EINVAL;
1761                         iterm = entity;
1762                 }
1763
1764                 if (UVC_ENTITY_IS_OTERM(entity)) {
1765                         if (oterm)
1766                                 return -EINVAL;
1767                         oterm = entity;
1768                 }
1769         }
1770
1771         if (iterm == NULL || oterm == NULL)
1772                 return -EINVAL;
1773
1774         /* Allocate the chain and fill it. */
1775         chain = uvc_alloc_chain(dev);
1776         if (chain == NULL)
1777                 return -ENOMEM;
1778
1779         if (uvc_scan_chain_entity(chain, oterm) < 0)
1780                 goto error;
1781
1782         prev = oterm;
1783
1784         /*
1785          * Add all Processing and Extension Units with two pads. The order
1786          * doesn't matter much, use reverse list traversal to connect units in
1787          * UVC descriptor order as we build the chain from output to input. This
1788          * leads to units appearing in the order meant by the manufacturer for
1789          * the cameras known to require this heuristic.
1790          */
1791         list_for_each_entry_reverse(entity, &dev->entities, list) {
1792                 if (entity->type != UVC_VC_PROCESSING_UNIT &&
1793                     entity->type != UVC_VC_EXTENSION_UNIT)
1794                         continue;
1795
1796                 if (entity->num_pads != 2)
1797                         continue;
1798
1799                 if (uvc_scan_chain_entity(chain, entity) < 0)
1800                         goto error;
1801
1802                 prev->baSourceID[0] = entity->id;
1803                 prev = entity;
1804         }
1805
1806         if (uvc_scan_chain_entity(chain, iterm) < 0)
1807                 goto error;
1808
1809         prev->baSourceID[0] = iterm->id;
1810
1811         list_add_tail(&chain->list, &dev->chains);
1812
1813         uvc_trace(UVC_TRACE_PROBE,
1814                   "Found a video chain by fallback heuristic (%s).\n",
1815                   uvc_print_chain(chain));
1816
1817         return 0;
1818
1819 error:
1820         kfree(chain);
1821         return -EINVAL;
1822 }
1823
1824 /*
1825  * Scan the device for video chains and register video devices.
1826  *
1827  * Chains are scanned starting at their output terminals and walked backwards.
1828  */
1829 static int uvc_scan_device(struct uvc_device *dev)
1830 {
1831         struct uvc_video_chain *chain;
1832         struct uvc_entity *term;
1833
1834         list_for_each_entry(term, &dev->entities, list) {
1835                 if (!UVC_ENTITY_IS_OTERM(term))
1836                         continue;
1837
1838                 /* If the terminal is already included in a chain, skip it.
1839                  * This can happen for chains that have multiple output
1840                  * terminals, where all output terminals beside the first one
1841                  * will be inserted in the chain in forward scans.
1842                  */
1843                 if (term->chain.next || term->chain.prev)
1844                         continue;
1845
1846                 chain = uvc_alloc_chain(dev);
1847                 if (chain == NULL)
1848                         return -ENOMEM;
1849
1850                 term->flags |= UVC_ENTITY_FLAG_DEFAULT;
1851
1852                 if (uvc_scan_chain(chain, term) < 0) {
1853                         kfree(chain);
1854                         continue;
1855                 }
1856
1857                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1858                           uvc_print_chain(chain));
1859
1860                 list_add_tail(&chain->list, &dev->chains);
1861         }
1862
1863         if (list_empty(&dev->chains))
1864                 uvc_scan_fallback(dev);
1865
1866         if (list_empty(&dev->chains)) {
1867                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1868                 return -1;
1869         }
1870
1871         return 0;
1872 }
1873
1874 /* ------------------------------------------------------------------------
1875  * Video device registration and unregistration
1876  */
1877
1878 /*
1879  * Delete the UVC device.
1880  *
1881  * Called by the kernel when the last reference to the uvc_device structure
1882  * is released.
1883  *
1884  * As this function is called after or during disconnect(), all URBs have
1885  * already been cancelled by the USB core. There is no need to kill the
1886  * interrupt URB manually.
1887  */
1888 static void uvc_delete(struct kref *kref)
1889 {
1890         struct uvc_device *dev = container_of(kref, struct uvc_device, ref);
1891         struct list_head *p, *n;
1892
1893         uvc_status_cleanup(dev);
1894         uvc_ctrl_cleanup_device(dev);
1895
1896         usb_put_intf(dev->intf);
1897         usb_put_dev(dev->udev);
1898
1899 #ifdef CONFIG_MEDIA_CONTROLLER
1900         media_device_cleanup(&dev->mdev);
1901 #endif
1902
1903         list_for_each_safe(p, n, &dev->chains) {
1904                 struct uvc_video_chain *chain;
1905                 chain = list_entry(p, struct uvc_video_chain, list);
1906                 kfree(chain);
1907         }
1908
1909         list_for_each_safe(p, n, &dev->entities) {
1910                 struct uvc_entity *entity;
1911                 entity = list_entry(p, struct uvc_entity, list);
1912 #ifdef CONFIG_MEDIA_CONTROLLER
1913                 uvc_mc_cleanup_entity(entity);
1914 #endif
1915                 kfree(entity);
1916         }
1917
1918         list_for_each_safe(p, n, &dev->streams) {
1919                 struct uvc_streaming *streaming;
1920                 streaming = list_entry(p, struct uvc_streaming, list);
1921                 usb_driver_release_interface(&uvc_driver.driver,
1922                         streaming->intf);
1923                 uvc_stream_delete(streaming);
1924         }
1925
1926         kfree(dev);
1927 }
1928
1929 static void uvc_release(struct video_device *vdev)
1930 {
1931         struct uvc_streaming *stream = video_get_drvdata(vdev);
1932         struct uvc_device *dev = stream->dev;
1933
1934         kref_put(&dev->ref, uvc_delete);
1935 }
1936
1937 /*
1938  * Unregister the video devices.
1939  */
1940 static void uvc_unregister_video(struct uvc_device *dev)
1941 {
1942         struct uvc_streaming *stream;
1943
1944         list_for_each_entry(stream, &dev->streams, list) {
1945                 if (!video_is_registered(&stream->vdev))
1946                         continue;
1947
1948                 video_unregister_device(&stream->vdev);
1949                 video_unregister_device(&stream->meta.vdev);
1950
1951                 uvc_debugfs_cleanup_stream(stream);
1952         }
1953
1954         uvc_status_unregister(dev);
1955
1956         if (dev->vdev.dev)
1957                 v4l2_device_unregister(&dev->vdev);
1958 #ifdef CONFIG_MEDIA_CONTROLLER
1959         if (media_devnode_is_registered(dev->mdev.devnode))
1960                 media_device_unregister(&dev->mdev);
1961 #endif
1962 }
1963
1964 int uvc_register_video_device(struct uvc_device *dev,
1965                               struct uvc_streaming *stream,
1966                               struct video_device *vdev,
1967                               struct uvc_video_queue *queue,
1968                               enum v4l2_buf_type type,
1969                               const struct v4l2_file_operations *fops,
1970                               const struct v4l2_ioctl_ops *ioctl_ops)
1971 {
1972         int ret;
1973
1974         /* Initialize the video buffers queue. */
1975         ret = uvc_queue_init(queue, type, !uvc_no_drop_param);
1976         if (ret)
1977                 return ret;
1978
1979         /* Register the device with V4L. */
1980
1981         /*
1982          * We already hold a reference to dev->udev. The video device will be
1983          * unregistered before the reference is released, so we don't need to
1984          * get another one.
1985          */
1986         vdev->v4l2_dev = &dev->vdev;
1987         vdev->fops = fops;
1988         vdev->ioctl_ops = ioctl_ops;
1989         vdev->release = uvc_release;
1990         vdev->prio = &stream->chain->prio;
1991         if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1992                 vdev->vfl_dir = VFL_DIR_TX;
1993         else
1994                 vdev->vfl_dir = VFL_DIR_RX;
1995
1996         switch (type) {
1997         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1998         default:
1999                 vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
2000                 break;
2001         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
2002                 vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
2003                 break;
2004         case V4L2_BUF_TYPE_META_CAPTURE:
2005                 vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
2006                 break;
2007         }
2008
2009         strscpy(vdev->name, dev->name, sizeof(vdev->name));
2010
2011         /*
2012          * Set the driver data before calling video_register_device, otherwise
2013          * the file open() handler might race us.
2014          */
2015         video_set_drvdata(vdev, stream);
2016
2017         ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
2018         if (ret < 0) {
2019                 uvc_printk(KERN_ERR, "Failed to register %s device (%d).\n",
2020                            v4l2_type_names[type], ret);
2021                 return ret;
2022         }
2023
2024         kref_get(&dev->ref);
2025         return 0;
2026 }
2027
2028 static int uvc_register_video(struct uvc_device *dev,
2029                 struct uvc_streaming *stream)
2030 {
2031         int ret;
2032
2033         /* Initialize the streaming interface with default parameters. */
2034         ret = uvc_video_init(stream);
2035         if (ret < 0) {
2036                 uvc_printk(KERN_ERR, "Failed to initialize the device (%d).\n",
2037                            ret);
2038                 return ret;
2039         }
2040
2041         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
2042                 stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE
2043                         | V4L2_CAP_META_CAPTURE;
2044         else
2045                 stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
2046
2047         uvc_debugfs_init_stream(stream);
2048
2049         /* Register the device with V4L. */
2050         return uvc_register_video_device(dev, stream, &stream->vdev,
2051                                          &stream->queue, stream->type,
2052                                          &uvc_fops, &uvc_ioctl_ops);
2053 }
2054
2055 /*
2056  * Register all video devices in all chains.
2057  */
2058 static int uvc_register_terms(struct uvc_device *dev,
2059         struct uvc_video_chain *chain)
2060 {
2061         struct uvc_streaming *stream;
2062         struct uvc_entity *term;
2063         int ret;
2064
2065         list_for_each_entry(term, &chain->entities, chain) {
2066                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
2067                         continue;
2068
2069                 stream = uvc_stream_by_id(dev, term->id);
2070                 if (stream == NULL) {
2071                         uvc_printk(KERN_INFO, "No streaming interface found "
2072                                    "for terminal %u.", term->id);
2073                         continue;
2074                 }
2075
2076                 stream->chain = chain;
2077                 ret = uvc_register_video(dev, stream);
2078                 if (ret < 0)
2079                         return ret;
2080
2081                 /* Register a metadata node, but ignore a possible failure,
2082                  * complete registration of video nodes anyway.
2083                  */
2084                 uvc_meta_register(stream);
2085
2086                 term->vdev = &stream->vdev;
2087         }
2088
2089         return 0;
2090 }
2091
2092 static int uvc_register_chains(struct uvc_device *dev)
2093 {
2094         struct uvc_video_chain *chain;
2095         int ret;
2096
2097         list_for_each_entry(chain, &dev->chains, list) {
2098                 ret = uvc_register_terms(dev, chain);
2099                 if (ret < 0)
2100                         return ret;
2101
2102 #ifdef CONFIG_MEDIA_CONTROLLER
2103                 ret = uvc_mc_register_entities(chain);
2104                 if (ret < 0)
2105                         uvc_printk(KERN_INFO,
2106                                    "Failed to register entities (%d).\n", ret);
2107 #endif
2108         }
2109
2110         return 0;
2111 }
2112
2113 /* ------------------------------------------------------------------------
2114  * USB probe, disconnect, suspend and resume
2115  */
2116
2117 static const struct uvc_device_info uvc_quirk_none = { 0 };
2118
2119 static int uvc_probe(struct usb_interface *intf,
2120                      const struct usb_device_id *id)
2121 {
2122         struct usb_device *udev = interface_to_usbdev(intf);
2123         struct uvc_device *dev;
2124         const struct uvc_device_info *info =
2125                 (const struct uvc_device_info *)id->driver_info;
2126         int function;
2127         int ret;
2128
2129         if (id->idVendor && id->idProduct)
2130                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
2131                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
2132                                 id->idProduct);
2133         else
2134                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
2135                                 udev->devpath);
2136
2137         /* Allocate memory for the device and initialize it. */
2138         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2139         if (dev == NULL)
2140                 return -ENOMEM;
2141
2142         INIT_LIST_HEAD(&dev->entities);
2143         INIT_LIST_HEAD(&dev->chains);
2144         INIT_LIST_HEAD(&dev->streams);
2145         kref_init(&dev->ref);
2146         atomic_set(&dev->nmappings, 0);
2147         mutex_init(&dev->lock);
2148
2149         dev->udev = usb_get_dev(udev);
2150         dev->intf = usb_get_intf(intf);
2151         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
2152         dev->info = info ? info : &uvc_quirk_none;
2153         dev->quirks = uvc_quirks_param == -1
2154                     ? dev->info->quirks : uvc_quirks_param;
2155
2156         if (udev->product != NULL)
2157                 strscpy(dev->name, udev->product, sizeof(dev->name));
2158         else
2159                 snprintf(dev->name, sizeof(dev->name),
2160                          "UVC Camera (%04x:%04x)",
2161                          le16_to_cpu(udev->descriptor.idVendor),
2162                          le16_to_cpu(udev->descriptor.idProduct));
2163
2164         /*
2165          * Add iFunction or iInterface to names when available as additional
2166          * distinguishers between interfaces. iFunction is prioritized over
2167          * iInterface which matches Windows behavior at the point of writing.
2168          */
2169         if (intf->intf_assoc && intf->intf_assoc->iFunction != 0)
2170                 function = intf->intf_assoc->iFunction;
2171         else
2172                 function = intf->cur_altsetting->desc.iInterface;
2173         if (function != 0) {
2174                 size_t len;
2175
2176                 strlcat(dev->name, ": ", sizeof(dev->name));
2177                 len = strlen(dev->name);
2178                 usb_string(udev, function, dev->name + len,
2179                            sizeof(dev->name) - len);
2180         }
2181
2182         /* Initialize the media device. */
2183 #ifdef CONFIG_MEDIA_CONTROLLER
2184         dev->mdev.dev = &intf->dev;
2185         strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
2186         if (udev->serial)
2187                 strscpy(dev->mdev.serial, udev->serial,
2188                         sizeof(dev->mdev.serial));
2189         usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));
2190         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
2191         media_device_init(&dev->mdev);
2192
2193         dev->vdev.mdev = &dev->mdev;
2194 #endif
2195
2196         /* Parse the Video Class control descriptor. */
2197         if (uvc_parse_control(dev) < 0) {
2198                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
2199                         "descriptors.\n");
2200                 goto error;
2201         }
2202
2203         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
2204                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
2205                 udev->product ? udev->product : "<unnamed>",
2206                 le16_to_cpu(udev->descriptor.idVendor),
2207                 le16_to_cpu(udev->descriptor.idProduct));
2208
2209         if (dev->quirks != dev->info->quirks) {
2210                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
2211                         "parameter for testing purpose.\n", dev->quirks);
2212                 uvc_printk(KERN_INFO, "Please report required quirks to the "
2213                         "linux-uvc-devel mailing list.\n");
2214         }
2215
2216         /* Register the V4L2 device. */
2217         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
2218                 goto error;
2219
2220         /* Initialize controls. */
2221         if (uvc_ctrl_init_device(dev) < 0)
2222                 goto error;
2223
2224         /* Scan the device for video chains. */
2225         if (uvc_scan_device(dev) < 0)
2226                 goto error;
2227
2228         /* Register video device nodes. */
2229         if (uvc_register_chains(dev) < 0)
2230                 goto error;
2231
2232 #ifdef CONFIG_MEDIA_CONTROLLER
2233         /* Register the media device node */
2234         if (media_device_register(&dev->mdev) < 0)
2235                 goto error;
2236 #endif
2237         /* Save our data pointer in the interface data. */
2238         usb_set_intfdata(intf, dev);
2239
2240         /* Initialize the interrupt URB. */
2241         if ((ret = uvc_status_init(dev)) < 0) {
2242                 uvc_printk(KERN_INFO, "Unable to initialize the status "
2243                         "endpoint (%d), status interrupt will not be "
2244                         "supported.\n", ret);
2245         }
2246
2247         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
2248         usb_enable_autosuspend(udev);
2249         return 0;
2250
2251 error:
2252         uvc_unregister_video(dev);
2253         kref_put(&dev->ref, uvc_delete);
2254         return -ENODEV;
2255 }
2256
2257 static void uvc_disconnect(struct usb_interface *intf)
2258 {
2259         struct uvc_device *dev = usb_get_intfdata(intf);
2260
2261         /* Set the USB interface data to NULL. This can be done outside the
2262          * lock, as there's no other reader.
2263          */
2264         usb_set_intfdata(intf, NULL);
2265
2266         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2267             UVC_SC_VIDEOSTREAMING)
2268                 return;
2269
2270         uvc_unregister_video(dev);
2271         kref_put(&dev->ref, uvc_delete);
2272 }
2273
2274 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
2275 {
2276         struct uvc_device *dev = usb_get_intfdata(intf);
2277         struct uvc_streaming *stream;
2278
2279         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
2280                 intf->cur_altsetting->desc.bInterfaceNumber);
2281
2282         /* Controls are cached on the fly so they don't need to be saved. */
2283         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2284             UVC_SC_VIDEOCONTROL) {
2285                 mutex_lock(&dev->lock);
2286                 if (dev->users)
2287                         uvc_status_stop(dev);
2288                 mutex_unlock(&dev->lock);
2289                 return 0;
2290         }
2291
2292         list_for_each_entry(stream, &dev->streams, list) {
2293                 if (stream->intf == intf)
2294                         return uvc_video_suspend(stream);
2295         }
2296
2297         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
2298                         "mismatch.\n");
2299         return -EINVAL;
2300 }
2301
2302 static int __uvc_resume(struct usb_interface *intf, int reset)
2303 {
2304         struct uvc_device *dev = usb_get_intfdata(intf);
2305         struct uvc_streaming *stream;
2306         int ret = 0;
2307
2308         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
2309                 intf->cur_altsetting->desc.bInterfaceNumber);
2310
2311         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2312             UVC_SC_VIDEOCONTROL) {
2313                 if (reset) {
2314                         ret = uvc_ctrl_restore_values(dev);
2315                         if (ret < 0)
2316                                 return ret;
2317                 }
2318
2319                 mutex_lock(&dev->lock);
2320                 if (dev->users)
2321                         ret = uvc_status_start(dev, GFP_NOIO);
2322                 mutex_unlock(&dev->lock);
2323
2324                 return ret;
2325         }
2326
2327         list_for_each_entry(stream, &dev->streams, list) {
2328                 if (stream->intf == intf) {
2329                         ret = uvc_video_resume(stream, reset);
2330                         if (ret < 0)
2331                                 uvc_queue_streamoff(&stream->queue,
2332                                                     stream->queue.queue.type);
2333                         return ret;
2334                 }
2335         }
2336
2337         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
2338                         "mismatch.\n");
2339         return -EINVAL;
2340 }
2341
2342 static int uvc_resume(struct usb_interface *intf)
2343 {
2344         return __uvc_resume(intf, 0);
2345 }
2346
2347 static int uvc_reset_resume(struct usb_interface *intf)
2348 {
2349         return __uvc_resume(intf, 1);
2350 }
2351
2352 /* ------------------------------------------------------------------------
2353  * Module parameters
2354  */
2355
2356 static int uvc_clock_param_get(char *buffer, const struct kernel_param *kp)
2357 {
2358         if (uvc_clock_param == CLOCK_MONOTONIC)
2359                 return sprintf(buffer, "CLOCK_MONOTONIC");
2360         else
2361                 return sprintf(buffer, "CLOCK_REALTIME");
2362 }
2363
2364 static int uvc_clock_param_set(const char *val, const struct kernel_param *kp)
2365 {
2366         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2367                 val += strlen("clock_");
2368
2369         if (strcasecmp(val, "monotonic") == 0)
2370                 uvc_clock_param = CLOCK_MONOTONIC;
2371         else if (strcasecmp(val, "realtime") == 0)
2372                 uvc_clock_param = CLOCK_REALTIME;
2373         else
2374                 return -EINVAL;
2375
2376         return 0;
2377 }
2378
2379 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2380                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2381 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2382 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, S_IRUGO|S_IWUSR);
2383 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
2384 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2385 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2386 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2387 MODULE_PARM_DESC(quirks, "Forced device quirks");
2388 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2389 MODULE_PARM_DESC(trace, "Trace level bitmask");
2390 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2391 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2392
2393 /* ------------------------------------------------------------------------
2394  * Driver initialization and cleanup
2395  */
2396
2397 static const struct uvc_device_info uvc_quirk_probe_minmax = {
2398         .quirks = UVC_QUIRK_PROBE_MINMAX,
2399 };
2400
2401 static const struct uvc_device_info uvc_quirk_fix_bandwidth = {
2402         .quirks = UVC_QUIRK_FIX_BANDWIDTH,
2403 };
2404
2405 static const struct uvc_device_info uvc_quirk_probe_def = {
2406         .quirks = UVC_QUIRK_PROBE_DEF,
2407 };
2408
2409 static const struct uvc_device_info uvc_quirk_stream_no_fid = {
2410         .quirks = UVC_QUIRK_STREAM_NO_FID,
2411 };
2412
2413 static const struct uvc_device_info uvc_quirk_force_y8 = {
2414         .quirks = UVC_QUIRK_FORCE_Y8,
2415 };
2416
2417 #define UVC_INFO_QUIRK(q) (kernel_ulong_t)&(struct uvc_device_info){.quirks = q}
2418 #define UVC_INFO_META(m) (kernel_ulong_t)&(struct uvc_device_info) \
2419         {.meta_format = m}
2420
2421 /*
2422  * The Logitech cameras listed below have their interface class set to
2423  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2424  * though they are compliant.
2425  */
2426 static const struct usb_device_id uvc_ids[] = {
2427         /* LogiLink Wireless Webcam */
2428         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2429                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2430           .idVendor             = 0x0416,
2431           .idProduct            = 0xa91a,
2432           .bInterfaceClass      = USB_CLASS_VIDEO,
2433           .bInterfaceSubClass   = 1,
2434           .bInterfaceProtocol   = 0,
2435           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2436         /* Genius eFace 2025 */
2437         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2438                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2439           .idVendor             = 0x0458,
2440           .idProduct            = 0x706e,
2441           .bInterfaceClass      = USB_CLASS_VIDEO,
2442           .bInterfaceSubClass   = 1,
2443           .bInterfaceProtocol   = 0,
2444           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2445         /* Microsoft Lifecam NX-6000 */
2446         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2447                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2448           .idVendor             = 0x045e,
2449           .idProduct            = 0x00f8,
2450           .bInterfaceClass      = USB_CLASS_VIDEO,
2451           .bInterfaceSubClass   = 1,
2452           .bInterfaceProtocol   = 0,
2453           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2454         /* Microsoft Lifecam NX-3000 */
2455         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2456                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2457           .idVendor             = 0x045e,
2458           .idProduct            = 0x0721,
2459           .bInterfaceClass      = USB_CLASS_VIDEO,
2460           .bInterfaceSubClass   = 1,
2461           .bInterfaceProtocol   = 0,
2462           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2463         /* Microsoft Lifecam VX-7000 */
2464         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2465                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2466           .idVendor             = 0x045e,
2467           .idProduct            = 0x0723,
2468           .bInterfaceClass      = USB_CLASS_VIDEO,
2469           .bInterfaceSubClass   = 1,
2470           .bInterfaceProtocol   = 0,
2471           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2472         /* Logitech Quickcam Fusion */
2473         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2474                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2475           .idVendor             = 0x046d,
2476           .idProduct            = 0x08c1,
2477           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2478           .bInterfaceSubClass   = 1,
2479           .bInterfaceProtocol   = 0 },
2480         /* Logitech Quickcam Orbit MP */
2481         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2482                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2483           .idVendor             = 0x046d,
2484           .idProduct            = 0x08c2,
2485           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2486           .bInterfaceSubClass   = 1,
2487           .bInterfaceProtocol   = 0 },
2488         /* Logitech Quickcam Pro for Notebook */
2489         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2490                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2491           .idVendor             = 0x046d,
2492           .idProduct            = 0x08c3,
2493           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2494           .bInterfaceSubClass   = 1,
2495           .bInterfaceProtocol   = 0 },
2496         /* Logitech Quickcam Pro 5000 */
2497         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2498                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2499           .idVendor             = 0x046d,
2500           .idProduct            = 0x08c5,
2501           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2502           .bInterfaceSubClass   = 1,
2503           .bInterfaceProtocol   = 0 },
2504         /* Logitech Quickcam OEM Dell Notebook */
2505         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2506                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2507           .idVendor             = 0x046d,
2508           .idProduct            = 0x08c6,
2509           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2510           .bInterfaceSubClass   = 1,
2511           .bInterfaceProtocol   = 0 },
2512         /* Logitech Quickcam OEM Cisco VT Camera II */
2513         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2514                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2515           .idVendor             = 0x046d,
2516           .idProduct            = 0x08c7,
2517           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2518           .bInterfaceSubClass   = 1,
2519           .bInterfaceProtocol   = 0 },
2520         /* Logitech HD Pro Webcam C920 */
2521         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2522                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2523           .idVendor             = 0x046d,
2524           .idProduct            = 0x082d,
2525           .bInterfaceClass      = USB_CLASS_VIDEO,
2526           .bInterfaceSubClass   = 1,
2527           .bInterfaceProtocol   = 0,
2528           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT) },
2529         /* Chicony CNF7129 (Asus EEE 100HE) */
2530         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2531                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2532           .idVendor             = 0x04f2,
2533           .idProduct            = 0xb071,
2534           .bInterfaceClass      = USB_CLASS_VIDEO,
2535           .bInterfaceSubClass   = 1,
2536           .bInterfaceProtocol   = 0,
2537           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTRICT_FRAME_RATE) },
2538         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2539         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2540                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2541           .idVendor             = 0x058f,
2542           .idProduct            = 0x3820,
2543           .bInterfaceClass      = USB_CLASS_VIDEO,
2544           .bInterfaceSubClass   = 1,
2545           .bInterfaceProtocol   = 0,
2546           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2547         /* Dell XPS m1530 */
2548         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2549                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2550           .idVendor             = 0x05a9,
2551           .idProduct            = 0x2640,
2552           .bInterfaceClass      = USB_CLASS_VIDEO,
2553           .bInterfaceSubClass   = 1,
2554           .bInterfaceProtocol   = 0,
2555           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2556         /* Dell SP2008WFP Monitor */
2557         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2558                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2559           .idVendor             = 0x05a9,
2560           .idProduct            = 0x2641,
2561           .bInterfaceClass      = USB_CLASS_VIDEO,
2562           .bInterfaceSubClass   = 1,
2563           .bInterfaceProtocol   = 0,
2564           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2565         /* Dell Alienware X51 */
2566         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2567                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2568           .idVendor             = 0x05a9,
2569           .idProduct            = 0x2643,
2570           .bInterfaceClass      = USB_CLASS_VIDEO,
2571           .bInterfaceSubClass   = 1,
2572           .bInterfaceProtocol   = 0,
2573           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2574         /* Dell Studio Hybrid 140g (OmniVision webcam) */
2575         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2576                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2577           .idVendor             = 0x05a9,
2578           .idProduct            = 0x264a,
2579           .bInterfaceClass      = USB_CLASS_VIDEO,
2580           .bInterfaceSubClass   = 1,
2581           .bInterfaceProtocol   = 0,
2582           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2583         /* Dell XPS M1330 (OmniVision OV7670 webcam) */
2584         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2585                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2586           .idVendor             = 0x05a9,
2587           .idProduct            = 0x7670,
2588           .bInterfaceClass      = USB_CLASS_VIDEO,
2589           .bInterfaceSubClass   = 1,
2590           .bInterfaceProtocol   = 0,
2591           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2592         /* Apple Built-In iSight */
2593         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2594                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2595           .idVendor             = 0x05ac,
2596           .idProduct            = 0x8501,
2597           .bInterfaceClass      = USB_CLASS_VIDEO,
2598           .bInterfaceSubClass   = 1,
2599           .bInterfaceProtocol   = 0,
2600           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2601                                         | UVC_QUIRK_BUILTIN_ISIGHT) },
2602         /* Apple Built-In iSight via iBridge */
2603         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2604                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2605           .idVendor             = 0x05ac,
2606           .idProduct            = 0x8600,
2607           .bInterfaceClass      = USB_CLASS_VIDEO,
2608           .bInterfaceSubClass   = 1,
2609           .bInterfaceProtocol   = 0,
2610           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2611         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2612         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2613                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2614           .idVendor             = 0x05c8,
2615           .idProduct            = 0x0403,
2616           .bInterfaceClass      = USB_CLASS_VIDEO,
2617           .bInterfaceSubClass   = 1,
2618           .bInterfaceProtocol   = 0,
2619           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2620         /* Genesys Logic USB 2.0 PC Camera */
2621         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2622                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2623           .idVendor             = 0x05e3,
2624           .idProduct            = 0x0505,
2625           .bInterfaceClass      = USB_CLASS_VIDEO,
2626           .bInterfaceSubClass   = 1,
2627           .bInterfaceProtocol   = 0,
2628           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2629         /* Hercules Classic Silver */
2630         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2631                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2632           .idVendor             = 0x06f8,
2633           .idProduct            = 0x300c,
2634           .bInterfaceClass      = USB_CLASS_VIDEO,
2635           .bInterfaceSubClass   = 1,
2636           .bInterfaceProtocol   = 0,
2637           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2638         /* ViMicro Vega */
2639         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2640                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2641           .idVendor             = 0x0ac8,
2642           .idProduct            = 0x332d,
2643           .bInterfaceClass      = USB_CLASS_VIDEO,
2644           .bInterfaceSubClass   = 1,
2645           .bInterfaceProtocol   = 0,
2646           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2647         /* ViMicro - Minoru3D */
2648         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2649                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2650           .idVendor             = 0x0ac8,
2651           .idProduct            = 0x3410,
2652           .bInterfaceClass      = USB_CLASS_VIDEO,
2653           .bInterfaceSubClass   = 1,
2654           .bInterfaceProtocol   = 0,
2655           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2656         /* ViMicro Venus - Minoru3D */
2657         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2658                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2659           .idVendor             = 0x0ac8,
2660           .idProduct            = 0x3420,
2661           .bInterfaceClass      = USB_CLASS_VIDEO,
2662           .bInterfaceSubClass   = 1,
2663           .bInterfaceProtocol   = 0,
2664           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2665         /* Ophir Optronics - SPCAM 620U */
2666         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2667                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2668           .idVendor             = 0x0bd3,
2669           .idProduct            = 0x0555,
2670           .bInterfaceClass      = USB_CLASS_VIDEO,
2671           .bInterfaceSubClass   = 1,
2672           .bInterfaceProtocol   = 0,
2673           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2674         /* MT6227 */
2675         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2676                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2677           .idVendor             = 0x0e8d,
2678           .idProduct            = 0x0004,
2679           .bInterfaceClass      = USB_CLASS_VIDEO,
2680           .bInterfaceSubClass   = 1,
2681           .bInterfaceProtocol   = 0,
2682           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2683                                         | UVC_QUIRK_PROBE_DEF) },
2684         /* IMC Networks (Medion Akoya) */
2685         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2686                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2687           .idVendor             = 0x13d3,
2688           .idProduct            = 0x5103,
2689           .bInterfaceClass      = USB_CLASS_VIDEO,
2690           .bInterfaceSubClass   = 1,
2691           .bInterfaceProtocol   = 0,
2692           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2693         /* JMicron USB2.0 XGA WebCam */
2694         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2695                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2696           .idVendor             = 0x152d,
2697           .idProduct            = 0x0310,
2698           .bInterfaceClass      = USB_CLASS_VIDEO,
2699           .bInterfaceSubClass   = 1,
2700           .bInterfaceProtocol   = 0,
2701           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2702         /* Syntek (HP Spartan) */
2703         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2704                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2705           .idVendor             = 0x174f,
2706           .idProduct            = 0x5212,
2707           .bInterfaceClass      = USB_CLASS_VIDEO,
2708           .bInterfaceSubClass   = 1,
2709           .bInterfaceProtocol   = 0,
2710           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2711         /* Syntek (Samsung Q310) */
2712         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2713                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2714           .idVendor             = 0x174f,
2715           .idProduct            = 0x5931,
2716           .bInterfaceClass      = USB_CLASS_VIDEO,
2717           .bInterfaceSubClass   = 1,
2718           .bInterfaceProtocol   = 0,
2719           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2720         /* Syntek (Packard Bell EasyNote MX52 */
2721         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2722                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2723           .idVendor             = 0x174f,
2724           .idProduct            = 0x8a12,
2725           .bInterfaceClass      = USB_CLASS_VIDEO,
2726           .bInterfaceSubClass   = 1,
2727           .bInterfaceProtocol   = 0,
2728           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2729         /* Syntek (Asus F9SG) */
2730         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2731                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2732           .idVendor             = 0x174f,
2733           .idProduct            = 0x8a31,
2734           .bInterfaceClass      = USB_CLASS_VIDEO,
2735           .bInterfaceSubClass   = 1,
2736           .bInterfaceProtocol   = 0,
2737           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2738         /* Syntek (Asus U3S) */
2739         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2740                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2741           .idVendor             = 0x174f,
2742           .idProduct            = 0x8a33,
2743           .bInterfaceClass      = USB_CLASS_VIDEO,
2744           .bInterfaceSubClass   = 1,
2745           .bInterfaceProtocol   = 0,
2746           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2747         /* Syntek (JAOtech Smart Terminal) */
2748         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2749                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2750           .idVendor             = 0x174f,
2751           .idProduct            = 0x8a34,
2752           .bInterfaceClass      = USB_CLASS_VIDEO,
2753           .bInterfaceSubClass   = 1,
2754           .bInterfaceProtocol   = 0,
2755           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2756         /* Miricle 307K */
2757         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2758                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2759           .idVendor             = 0x17dc,
2760           .idProduct            = 0x0202,
2761           .bInterfaceClass      = USB_CLASS_VIDEO,
2762           .bInterfaceSubClass   = 1,
2763           .bInterfaceProtocol   = 0,
2764           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2765         /* Lenovo Thinkpad SL400/SL500 */
2766         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2767                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2768           .idVendor             = 0x17ef,
2769           .idProduct            = 0x480b,
2770           .bInterfaceClass      = USB_CLASS_VIDEO,
2771           .bInterfaceSubClass   = 1,
2772           .bInterfaceProtocol   = 0,
2773           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2774         /* Aveo Technology USB 2.0 Camera */
2775         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2776                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2777           .idVendor             = 0x1871,
2778           .idProduct            = 0x0306,
2779           .bInterfaceClass      = USB_CLASS_VIDEO,
2780           .bInterfaceSubClass   = 1,
2781           .bInterfaceProtocol   = 0,
2782           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2783                                         | UVC_QUIRK_PROBE_EXTRAFIELDS) },
2784         /* Aveo Technology USB 2.0 Camera (Tasco USB Microscope) */
2785         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2786                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2787           .idVendor             = 0x1871,
2788           .idProduct            = 0x0516,
2789           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2790           .bInterfaceSubClass   = 1,
2791           .bInterfaceProtocol   = 0 },
2792         /* Ecamm Pico iMage */
2793         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2794                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2795           .idVendor             = 0x18cd,
2796           .idProduct            = 0xcafe,
2797           .bInterfaceClass      = USB_CLASS_VIDEO,
2798           .bInterfaceSubClass   = 1,
2799           .bInterfaceProtocol   = 0,
2800           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_EXTRAFIELDS) },
2801         /* Manta MM-353 Plako */
2802         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2803                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2804           .idVendor             = 0x18ec,
2805           .idProduct            = 0x3188,
2806           .bInterfaceClass      = USB_CLASS_VIDEO,
2807           .bInterfaceSubClass   = 1,
2808           .bInterfaceProtocol   = 0,
2809           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2810         /* FSC WebCam V30S */
2811         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2812                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2813           .idVendor             = 0x18ec,
2814           .idProduct            = 0x3288,
2815           .bInterfaceClass      = USB_CLASS_VIDEO,
2816           .bInterfaceSubClass   = 1,
2817           .bInterfaceProtocol   = 0,
2818           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2819         /* Arkmicro unbranded */
2820         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2821                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2822           .idVendor             = 0x18ec,
2823           .idProduct            = 0x3290,
2824           .bInterfaceClass      = USB_CLASS_VIDEO,
2825           .bInterfaceSubClass   = 1,
2826           .bInterfaceProtocol   = 0,
2827           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2828         /* The Imaging Source USB CCD cameras */
2829         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2830                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2831           .idVendor             = 0x199e,
2832           .idProduct            = 0x8102,
2833           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2834           .bInterfaceSubClass   = 1,
2835           .bInterfaceProtocol   = 0 },
2836         /* Bodelin ProScopeHR */
2837         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2838                                 | USB_DEVICE_ID_MATCH_DEV_HI
2839                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2840           .idVendor             = 0x19ab,
2841           .idProduct            = 0x1000,
2842           .bcdDevice_hi         = 0x0126,
2843           .bInterfaceClass      = USB_CLASS_VIDEO,
2844           .bInterfaceSubClass   = 1,
2845           .bInterfaceProtocol   = 0,
2846           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_STATUS_INTERVAL) },
2847         /* MSI StarCam 370i */
2848         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2849                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2850           .idVendor             = 0x1b3b,
2851           .idProduct            = 0x2951,
2852           .bInterfaceClass      = USB_CLASS_VIDEO,
2853           .bInterfaceSubClass   = 1,
2854           .bInterfaceProtocol   = 0,
2855           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2856         /* Generalplus Technology Inc. 808 Camera */
2857         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2858                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2859           .idVendor             = 0x1b3f,
2860           .idProduct            = 0x2002,
2861           .bInterfaceClass      = USB_CLASS_VIDEO,
2862           .bInterfaceSubClass   = 1,
2863           .bInterfaceProtocol   = 0,
2864           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2865         /* SiGma Micro USB Web Camera */
2866         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2867                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2868           .idVendor             = 0x1c4f,
2869           .idProduct            = 0x3000,
2870           .bInterfaceClass      = USB_CLASS_VIDEO,
2871           .bInterfaceSubClass   = 1,
2872           .bInterfaceProtocol   = 0,
2873           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2874                                         | UVC_QUIRK_IGNORE_SELECTOR_UNIT) },
2875         /* Oculus VR Positional Tracker DK2 */
2876         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2877                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2878           .idVendor             = 0x2833,
2879           .idProduct            = 0x0201,
2880           .bInterfaceClass      = USB_CLASS_VIDEO,
2881           .bInterfaceSubClass   = 1,
2882           .bInterfaceProtocol   = 0,
2883           .driver_info          = (kernel_ulong_t)&uvc_quirk_force_y8 },
2884         /* Oculus VR Rift Sensor */
2885         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2886                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2887           .idVendor             = 0x2833,
2888           .idProduct            = 0x0211,
2889           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2890           .bInterfaceSubClass   = 1,
2891           .bInterfaceProtocol   = 0,
2892           .driver_info          = (kernel_ulong_t)&uvc_quirk_force_y8 },
2893         /* GEO Semiconductor GC6500 */
2894         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2895                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2896           .idVendor             = 0x29fe,
2897           .idProduct            = 0x4d53,
2898           .bInterfaceClass      = USB_CLASS_VIDEO,
2899           .bInterfaceSubClass   = 1,
2900           .bInterfaceProtocol   = 0,
2901           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_FORCE_BPP) },
2902         /* Intel RealSense D4M */
2903         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2904                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2905           .idVendor             = 0x8086,
2906           .idProduct            = 0x0b03,
2907           .bInterfaceClass      = USB_CLASS_VIDEO,
2908           .bInterfaceSubClass   = 1,
2909           .bInterfaceProtocol   = 0,
2910           .driver_info          = UVC_INFO_META(V4L2_META_FMT_D4XX) },
2911         /* Generic USB Video Class */
2912         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_UNDEFINED) },
2913         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_15) },
2914         {}
2915 };
2916
2917 MODULE_DEVICE_TABLE(usb, uvc_ids);
2918
2919 struct uvc_driver uvc_driver = {
2920         .driver = {
2921                 .name           = "uvcvideo",
2922                 .probe          = uvc_probe,
2923                 .disconnect     = uvc_disconnect,
2924                 .suspend        = uvc_suspend,
2925                 .resume         = uvc_resume,
2926                 .reset_resume   = uvc_reset_resume,
2927                 .id_table       = uvc_ids,
2928                 .supports_autosuspend = 1,
2929         },
2930 };
2931
2932 static int __init uvc_init(void)
2933 {
2934         int ret;
2935
2936         uvc_debugfs_init();
2937
2938         ret = usb_register(&uvc_driver.driver);
2939         if (ret < 0) {
2940                 uvc_debugfs_cleanup();
2941                 return ret;
2942         }
2943
2944         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2945         return 0;
2946 }
2947
2948 static void __exit uvc_cleanup(void)
2949 {
2950         usb_deregister(&uvc_driver.driver);
2951         uvc_debugfs_cleanup();
2952 }
2953
2954 module_init(uvc_init);
2955 module_exit(uvc_cleanup);
2956
2957 MODULE_AUTHOR(DRIVER_AUTHOR);
2958 MODULE_DESCRIPTION(DRIVER_DESC);
2959 MODULE_LICENSE("GPL");
2960 MODULE_VERSION(DRIVER_VERSION);
2961