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   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2008
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 /*
  15  * This driver aims to support video input devices compliant with the 'USB
  16  * Video Class' specification.
  17  *
  18  * The driver doesn't support the deprecated v4l1 interface. It implements the
  19  * mmap capture method only, and doesn't do any image format conversion in
  20  * software. If your user-space application doesn't support YUYV or MJPEG, fix
  21  * it :-). Please note that the MJPEG data have been stripped from their
  22  * Huffman tables (DHT marker), you will need to add it back if your JPEG
  23  * codec can't handle MJPEG data.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/version.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/usb.h>
  31 #include <linux/videodev2.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/wait.h>
  34 #include <asm/atomic.h>
  35 #include <asm/unaligned.h>
  36
  37 #include <media/v4l2-common.h>
  38
  39 #include "uvcvideo.h"
  40
  41 #define DRIVER_AUTHOR           "Laurent Pinchart <laurent.pinchart@skynet.be>"
  42 #define DRIVER_DESC             "USB Video Class driver"
  43 #ifndef DRIVER_VERSION
  44 #define DRIVER_VERSION          "v0.1.0"
  45 #endif
  46
  47 static unsigned int uvc_quirks_param;
  48 unsigned int uvc_trace_param;
  49
  50 /* ------------------------------------------------------------------------
  51  * Control, formats, ...
  52  */
  53
  54 static struct uvc_format_desc uvc_fmts[] = {
  55         {
  56                 .name           = "YUV 4:2:2 (YUYV)",
  57                 .guid           = UVC_GUID_FORMAT_YUY2,
  58                 .fcc            = V4L2_PIX_FMT_YUYV,
  59         },
  60         {
  61                 .name           = "YUV 4:2:0 (NV12)",
  62                 .guid           = UVC_GUID_FORMAT_NV12,
  63                 .fcc            = V4L2_PIX_FMT_NV12,
  64         },
  65         {
  66                 .name           = "MJPEG",
  67                 .guid           = UVC_GUID_FORMAT_MJPEG,
  68                 .fcc            = V4L2_PIX_FMT_MJPEG,
  69         },
  70         {
  71                 .name           = "YVU 4:2:0 (YV12)",
  72                 .guid           = UVC_GUID_FORMAT_YV12,
  73                 .fcc            = V4L2_PIX_FMT_YVU420,
  74         },
  75         {
  76                 .name           = "YUV 4:2:0 (I420)",
  77                 .guid           = UVC_GUID_FORMAT_I420,
  78                 .fcc            = V4L2_PIX_FMT_YUV420,
  79         },
  80         {
  81                 .name           = "YUV 4:2:2 (UYVY)",
  82                 .guid           = UVC_GUID_FORMAT_UYVY,
  83                 .fcc            = V4L2_PIX_FMT_UYVY,
  84         },
  85         {
  86                 .name           = "Greyscale",
  87                 .guid           = UVC_GUID_FORMAT_Y800,
  88                 .fcc            = V4L2_PIX_FMT_GREY,
  89         },
  90         {
  91                 .name           = "RGB Bayer",
  92                 .guid           = UVC_GUID_FORMAT_BY8,
  93                 .fcc            = V4L2_PIX_FMT_SBGGR8,
  94         },
  95 };
  96
  97 /* ------------------------------------------------------------------------
  98  * Utility functions
  99  */
 100
 101 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 102                 __u8 epaddr)
 103 {
 104         struct usb_host_endpoint *ep;
 105         unsigned int i;
 106
 107         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 108                 ep = &alts->endpoint[i];
 109                 if (ep->desc.bEndpointAddress == epaddr)
 110                         return ep;
 111         }
 112
 113         return NULL;
 114 }
 115
 116 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 117 {
 118         unsigned int len = ARRAY_SIZE(uvc_fmts);
 119         unsigned int i;
 120
 121         for (i = 0; i < len; ++i) {
 122                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 123                         return &uvc_fmts[i];
 124         }
 125
 126         return NULL;
 127 }
 128
 129 static __u32 uvc_colorspace(const __u8 primaries)
 130 {
 131         static const __u8 colorprimaries[] = {
 132                 0,
 133                 V4L2_COLORSPACE_SRGB,
 134                 V4L2_COLORSPACE_470_SYSTEM_M,
 135                 V4L2_COLORSPACE_470_SYSTEM_BG,
 136                 V4L2_COLORSPACE_SMPTE170M,
 137                 V4L2_COLORSPACE_SMPTE240M,
 138         };
 139
 140         if (primaries < ARRAY_SIZE(colorprimaries))
 141                 return colorprimaries[primaries];
 142
 143         return 0;
 144 }
 145
 146 /* Simplify a fraction using a simple continued fraction decomposition. The
 147  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 148  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 149  * arbitrary parameters to remove non-significative terms from the simple
 150  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 151  * respectively seems to give nice results.
 152  */
 153 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 154                 unsigned int n_terms, unsigned int threshold)
 155 {
 156         uint32_t *an;
 157         uint32_t x, y, r;
 158         unsigned int i, n;
 159
 160         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 161         if (an == NULL)
 162                 return;
 163
 164         /* Convert the fraction to a simple continued fraction. See
 165          * http://mathforum.org/dr.math/faq/faq.fractions.html
 166          * Stop if the current term is bigger than or equal to the given
 167          * threshold.
 168          */
 169         x = *numerator;
 170         y = *denominator;
 171
 172         for (n = 0; n < n_terms && y != 0; ++n) {
 173                 an[n] = x / y;
 174                 if (an[n] >= threshold) {
 175                         if (n < 2)
 176                                 n++;
 177                         break;
 178                 }
 179
 180                 r = x - an[n] * y;
 181                 x = y;
 182                 y = r;
 183         }
 184
 185         /* Expand the simple continued fraction back to an integer fraction. */
 186         x = 0;
 187         y = 1;
 188
 189         for (i = n; i > 0; --i) {
 190                 r = y;
 191                 y = an[i-1] * y + x;
 192                 x = r;
 193         }
 194
 195         *numerator = y;
 196         *denominator = x;
 197         kfree(an);
 198 }
 199
 200 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 201  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 202  * arithmetic only.
 203  */
 204 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 205 {
 206         uint32_t multiplier;
 207
 208         /* Saturate the result if the operation would overflow. */
 209         if (denominator == 0 ||
 210             numerator/denominator >= ((uint32_t)-1)/10000000)
 211                 return (uint32_t)-1;
 212
 213         /* Divide both the denominator and the multiplier by two until
 214          * numerator * multiplier doesn't overflow. If anyone knows a better
 215          * algorithm please let me know.
 216          */
 217         multiplier = 10000000;
 218         while (numerator > ((uint32_t)-1)/multiplier) {
 219                 multiplier /= 2;
 220                 denominator /= 2;
 221         }
 222
 223         return denominator ? numerator * multiplier / denominator : 0;
 224 }
 225
 226 /* ------------------------------------------------------------------------
 227  * Terminal and unit management
 228  */
 229
 230 static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 231 {
 232         struct uvc_entity *entity;
 233
 234         list_for_each_entry(entity, &dev->entities, list) {
 235                 if (entity->id == id)
 236                         return entity;
 237         }
 238
 239         return NULL;
 240 }
 241
 242 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 243         int id, struct uvc_entity *entity)
 244 {
 245         unsigned int i;
 246
 247         if (entity == NULL)
 248                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 249
 250         list_for_each_entry_continue(entity, &dev->entities, list) {
 251                 switch (UVC_ENTITY_TYPE(entity)) {
 252                 case TT_STREAMING:
 253                         if (entity->output.bSourceID == id)
 254                                 return entity;
 255                         break;
 256
 257                 case VC_PROCESSING_UNIT:
 258                         if (entity->processing.bSourceID == id)
 259                                 return entity;
 260                         break;
 261
 262                 case VC_SELECTOR_UNIT:
 263                         for (i = 0; i < entity->selector.bNrInPins; ++i)
 264                                 if (entity->selector.baSourceID[i] == id)
 265                                         return entity;
 266                         break;
 267
 268                 case VC_EXTENSION_UNIT:
 269                         for (i = 0; i < entity->extension.bNrInPins; ++i)
 270                                 if (entity->extension.baSourceID[i] == id)
 271                                         return entity;
 272                         break;
 273                 }
 274         }
 275
 276         return NULL;
 277 }
 278
 279 /* ------------------------------------------------------------------------
 280  * Descriptors handling
 281  */
 282
 283 static int uvc_parse_format(struct uvc_device *dev,
 284         struct uvc_streaming *streaming, struct uvc_format *format,
 285         __u32 **intervals, unsigned char *buffer, int buflen)
 286 {
 287         struct usb_interface *intf = streaming->intf;
 288         struct usb_host_interface *alts = intf->cur_altsetting;
 289         struct uvc_format_desc *fmtdesc;
 290         struct uvc_frame *frame;
 291         const unsigned char *start = buffer;
 292         unsigned char *_buffer;
 293         unsigned int interval;
 294         unsigned int i, n;
 295         int _buflen;
 296         __u8 ftype;
 297
 298         format->type = buffer[2];
 299         format->index = buffer[3];
 300
 301         switch (buffer[2]) {
 302         case VS_FORMAT_UNCOMPRESSED:
 303         case VS_FORMAT_FRAME_BASED:
 304                 n = buffer[2] == VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 305                 if (buflen < n) {
 306                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 307                                "interface %d FORMAT error\n",
 308                                dev->udev->devnum,
 309                                alts->desc.bInterfaceNumber);
 310                         return -EINVAL;
 311                 }
 312
 313                 /* Find the format descriptor from its GUID. */
 314                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 315
 316                 if (fmtdesc != NULL) {
 317                         strncpy(format->name, fmtdesc->name,
 318                                 sizeof format->name);
 319                         format->fcc = fmtdesc->fcc;
 320                 } else {
 321                         uvc_printk(KERN_INFO, "Unknown video format "
 322                                 UVC_GUID_FORMAT "\n",
 323                                 UVC_GUID_ARGS(&buffer[5]));
 324                         snprintf(format->name, sizeof format->name,
 325                                 UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
 326                         format->fcc = 0;
 327                 }
 328
 329                 format->bpp = buffer[21];
 330                 if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
 331                         ftype = VS_FRAME_UNCOMPRESSED;
 332                 } else {
 333                         ftype = VS_FRAME_FRAME_BASED;
 334                         if (buffer[27])
 335                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 336                 }
 337                 break;
 338
 339         case VS_FORMAT_MJPEG:
 340                 if (buflen < 11) {
 341                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 342                                "interface %d FORMAT error\n",
 343                                dev->udev->devnum,
 344                                alts->desc.bInterfaceNumber);
 345                         return -EINVAL;
 346                 }
 347
 348                 strncpy(format->name, "MJPEG", sizeof format->name);
 349                 format->fcc = V4L2_PIX_FMT_MJPEG;
 350                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 351                 format->bpp = 0;
 352                 ftype = VS_FRAME_MJPEG;
 353                 break;
 354
 355         case VS_FORMAT_DV:
 356                 if (buflen < 9) {
 357                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 358                                "interface %d FORMAT error\n",
 359                                dev->udev->devnum,
 360                                alts->desc.bInterfaceNumber);
 361                         return -EINVAL;
 362                 }
 363
 364                 switch (buffer[8] & 0x7f) {
 365                 case 0:
 366                         strncpy(format->name, "SD-DV", sizeof format->name);
 367                         break;
 368                 case 1:
 369                         strncpy(format->name, "SDL-DV", sizeof format->name);
 370                         break;
 371                 case 2:
 372                         strncpy(format->name, "HD-DV", sizeof format->name);
 373                         break;
 374                 default:
 375                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 376                                "interface %d: unknown DV format %u\n",
 377                                dev->udev->devnum,
 378                                alts->desc.bInterfaceNumber, buffer[8]);
 379                         return -EINVAL;
 380                 }
 381
 382                 strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 383                         sizeof format->name);
 384
 385                 format->fcc = V4L2_PIX_FMT_DV;
 386                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 387                 format->bpp = 0;
 388                 ftype = 0;
 389
 390                 /* Create a dummy frame descriptor. */
 391                 frame = &format->frame[0];
 392                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 393                 frame->bFrameIntervalType = 1;
 394                 frame->dwDefaultFrameInterval = 1;
 395                 frame->dwFrameInterval = *intervals;
 396                 *(*intervals)++ = 1;
 397                 format->nframes = 1;
 398                 break;
 399
 400         case VS_FORMAT_MPEG2TS:
 401         case VS_FORMAT_STREAM_BASED:
 402                 /* Not supported yet. */
 403         default:
 404                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 405                        "interface %d unsupported format %u\n",
 406                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 407                        buffer[2]);
 408                 return -EINVAL;
 409         }
 410
 411         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 412
 413         buflen -= buffer[0];
 414         buffer += buffer[0];
 415
 416         /* Count the number of frame descriptors to test the bFrameIndex
 417          * field when parsing the descriptors. We can't rely on the
 418          * bNumFrameDescriptors field as some cameras don't initialize it
 419          * properly.
 420          */
 421         for (_buflen = buflen, _buffer = buffer;
 422              _buflen > 2 && _buffer[2] == ftype;
 423              _buflen -= _buffer[0], _buffer += _buffer[0])
 424                 format->nframes++;
 425
 426         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 427          * based formats have frame descriptors.
 428          */
 429         while (buflen > 2 && buffer[2] == ftype) {
 430                 if (ftype != VS_FRAME_FRAME_BASED)
 431                         n = buflen > 25 ? buffer[25] : 0;
 432                 else
 433                         n = buflen > 21 ? buffer[21] : 0;
 434
 435                 n = n ? n : 3;
 436
 437                 if (buflen < 26 + 4*n) {
 438                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 439                                "interface %d FRAME error\n", dev->udev->devnum,
 440                                alts->desc.bInterfaceNumber);
 441                         return -EINVAL;
 442                 }
 443
 444                 if (buffer[3] - 1 >= format->nframes) {
 445                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 446                                "interface %d frame index %u out of range\n",
 447                                dev->udev->devnum, alts->desc.bInterfaceNumber,
 448                                buffer[3]);
 449                         return -EINVAL;
 450                 }
 451
 452                 frame = &format->frame[buffer[3] - 1];
 453
 454                 frame->bFrameIndex = buffer[3];
 455                 frame->bmCapabilities = buffer[4];
 456                 frame->wWidth = get_unaligned_le16(&buffer[5]);
 457                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 458                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 459                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 460                 if (ftype != VS_FRAME_FRAME_BASED) {
 461                         frame->dwMaxVideoFrameBufferSize =
 462                                 get_unaligned_le32(&buffer[17]);
 463                         frame->dwDefaultFrameInterval =
 464                                 get_unaligned_le32(&buffer[21]);
 465                         frame->bFrameIntervalType = buffer[25];
 466                 } else {
 467                         frame->dwMaxVideoFrameBufferSize = 0;
 468                         frame->dwDefaultFrameInterval =
 469                                 get_unaligned_le32(&buffer[17]);
 470                         frame->bFrameIntervalType = buffer[21];
 471                 }
 472                 frame->dwFrameInterval = *intervals;
 473
 474                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 475                  * completely. Observed behaviours range from setting the
 476                  * value to 1.1x the actual frame size of hardwiring the
 477                  * 16 low bits to 0. This results in a higher than necessary
 478                  * memory usage as well as a wrong image size information. For
 479                  * uncompressed formats this can be fixed by computing the
 480                  * value from the frame size.
 481                  */
 482                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 483                         frame->dwMaxVideoFrameBufferSize = format->bpp
 484                                 * frame->wWidth * frame->wHeight / 8;
 485
 486                 /* Some bogus devices report dwMinFrameInterval equal to
 487                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 488                  * zero. Setting all null intervals to 1 fixes the problem and
 489                  * some other divisions by zero which could happen.
 490                  */
 491                 for (i = 0; i < n; ++i) {
 492                         interval = get_unaligned_le32(&buffer[26+4*i]);
 493                         *(*intervals)++ = interval ? interval : 1;
 494                 }
 495
 496                 /* Make sure that the default frame interval stays between
 497                  * the boundaries.
 498                  */
 499                 n -= frame->bFrameIntervalType ? 1 : 2;
 500                 frame->dwDefaultFrameInterval =
 501                         min(frame->dwFrameInterval[n],
 502                             max(frame->dwFrameInterval[0],
 503                                 frame->dwDefaultFrameInterval));
 504
 505                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 506                         frame->wWidth, frame->wHeight,
 507                         10000000/frame->dwDefaultFrameInterval,
 508                         (100000000/frame->dwDefaultFrameInterval)%10);
 509
 510                 buflen -= buffer[0];
 511                 buffer += buffer[0];
 512         }
 513
 514         if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
 515                 buflen -= buffer[0];
 516                 buffer += buffer[0];
 517         }
 518
 519         if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
 520                 if (buflen < 6) {
 521                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 522                                "interface %d COLORFORMAT error\n",
 523                                dev->udev->devnum,
 524                                alts->desc.bInterfaceNumber);
 525                         return -EINVAL;
 526                 }
 527
 528                 format->colorspace = uvc_colorspace(buffer[3]);
 529
 530                 buflen -= buffer[0];
 531                 buffer += buffer[0];
 532         }
 533
 534         return buffer - start;
 535 }
 536
 537 static int uvc_parse_streaming(struct uvc_device *dev,
 538         struct usb_interface *intf)
 539 {
 540         struct uvc_streaming *streaming = NULL;
 541         struct uvc_format *format;
 542         struct uvc_frame *frame;
 543         struct usb_host_interface *alts = &intf->altsetting[0];
 544         unsigned char *_buffer, *buffer = alts->extra;
 545         int _buflen, buflen = alts->extralen;
 546         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 547         unsigned int size, i, n, p;
 548         __u32 *interval;
 549         __u16 psize;
 550         int ret = -EINVAL;
 551
 552         if (intf->cur_altsetting->desc.bInterfaceSubClass
 553                 != SC_VIDEOSTREAMING) {
 554                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 555                         "video streaming interface\n", dev->udev->devnum,
 556                         intf->altsetting[0].desc.bInterfaceNumber);
 557                 return -EINVAL;
 558         }
 559
 560         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 561                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 562                         "claimed\n", dev->udev->devnum,
 563                         intf->altsetting[0].desc.bInterfaceNumber);
 564                 return -EINVAL;
 565         }
 566
 567         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 568         if (streaming == NULL) {
 569                 usb_driver_release_interface(&uvc_driver.driver, intf);
 570                 return -EINVAL;
 571         }
 572
 573         mutex_init(&streaming->mutex);
 574         streaming->intf = usb_get_intf(intf);
 575         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 576
 577         /* The Pico iMage webcam has its class-specific interface descriptors
 578          * after the endpoint descriptors.
 579          */
 580         if (buflen == 0) {
 581                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 582                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 583
 584                         if (ep->extralen == 0)
 585                                 continue;
 586
 587                         if (ep->extralen > 2 &&
 588                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 589                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 590                                         "from endpoint %u.\n", i);
 591                                 buffer = alts->endpoint[i].extra;
 592                                 buflen = alts->endpoint[i].extralen;
 593                                 break;
 594                         }
 595                 }
 596         }
 597
 598         /* Skip the standard interface descriptors. */
 599         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 600                 buflen -= buffer[0];
 601                 buffer += buffer[0];
 602         }
 603
 604         if (buflen <= 2) {
 605                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 606                         "interface descriptors found.\n");
 607                 goto error;
 608         }
 609
 610         /* Parse the header descriptor. */
 611         if (buffer[2] == VS_OUTPUT_HEADER) {
 612                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 613                         "%d OUTPUT HEADER descriptor is not supported.\n",
 614                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 615                 goto error;
 616         } else if (buffer[2] == VS_INPUT_HEADER) {
 617                 p = buflen >= 5 ? buffer[3] : 0;
 618                 n = buflen >= 12 ? buffer[12] : 0;
 619
 620                 if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
 621                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 622                                 "interface %d INPUT HEADER descriptor is "
 623                                 "invalid.\n", dev->udev->devnum,
 624                                 alts->desc.bInterfaceNumber);
 625                         goto error;
 626                 }
 627
 628                 streaming->header.bNumFormats = p;
 629                 streaming->header.bEndpointAddress = buffer[6];
 630                 streaming->header.bmInfo = buffer[7];
 631                 streaming->header.bTerminalLink = buffer[8];
 632                 streaming->header.bStillCaptureMethod = buffer[9];
 633                 streaming->header.bTriggerSupport = buffer[10];
 634                 streaming->header.bTriggerUsage = buffer[11];
 635                 streaming->header.bControlSize = n;
 636
 637                 streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
 638                 if (streaming->header.bmaControls == NULL) {
 639                         ret = -ENOMEM;
 640                         goto error;
 641                 }
 642
 643                 memcpy(streaming->header.bmaControls, &buffer[13], p*n);
 644         } else {
 645                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 646                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 647                         alts->desc.bInterfaceNumber);
 648                 goto error;
 649         }
 650
 651         buflen -= buffer[0];
 652         buffer += buffer[0];
 653
 654         _buffer = buffer;
 655         _buflen = buflen;
 656
 657         /* Count the format and frame descriptors. */
 658         while (_buflen > 2) {
 659                 switch (_buffer[2]) {
 660                 case VS_FORMAT_UNCOMPRESSED:
 661                 case VS_FORMAT_MJPEG:
 662                 case VS_FORMAT_FRAME_BASED:
 663                         nformats++;
 664                         break;
 665
 666                 case VS_FORMAT_DV:
 667                         /* DV format has no frame descriptor. We will create a
 668                          * dummy frame descriptor with a dummy frame interval.
 669                          */
 670                         nformats++;
 671                         nframes++;
 672                         nintervals++;
 673                         break;
 674
 675                 case VS_FORMAT_MPEG2TS:
 676                 case VS_FORMAT_STREAM_BASED:
 677                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 678                                 "interface %d FORMAT %u is not supported.\n",
 679                                 dev->udev->devnum,
 680                                 alts->desc.bInterfaceNumber, _buffer[2]);
 681                         break;
 682
 683                 case VS_FRAME_UNCOMPRESSED:
 684                 case VS_FRAME_MJPEG:
 685                         nframes++;
 686                         if (_buflen > 25)
 687                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 688                         break;
 689
 690                 case VS_FRAME_FRAME_BASED:
 691                         nframes++;
 692                         if (_buflen > 21)
 693                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 694                         break;
 695                 }
 696
 697                 _buflen -= _buffer[0];
 698                 _buffer += _buffer[0];
 699         }
 700
 701         if (nformats == 0) {
 702                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 703                         "%d has no supported formats defined.\n",
 704                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 705                 goto error;
 706         }
 707
 708         size = nformats * sizeof *format + nframes * sizeof *frame
 709              + nintervals * sizeof *interval;
 710         format = kzalloc(size, GFP_KERNEL);
 711         if (format == NULL) {
 712                 ret = -ENOMEM;
 713                 goto error;
 714         }
 715
 716         frame = (struct uvc_frame *)&format[nformats];
 717         interval = (__u32 *)&frame[nframes];
 718
 719         streaming->format = format;
 720         streaming->nformats = nformats;
 721
 722         /* Parse the format descriptors. */
 723         while (buflen > 2) {
 724                 switch (buffer[2]) {
 725                 case VS_FORMAT_UNCOMPRESSED:
 726                 case VS_FORMAT_MJPEG:
 727                 case VS_FORMAT_DV:
 728                 case VS_FORMAT_FRAME_BASED:
 729                         format->frame = frame;
 730                         ret = uvc_parse_format(dev, streaming, format,
 731                                 &interval, buffer, buflen);
 732                         if (ret < 0)
 733                                 goto error;
 734
 735                         frame += format->nframes;
 736                         format++;
 737
 738                         buflen -= ret;
 739                         buffer += ret;
 740                         continue;
 741
 742                 default:
 743                         break;
 744                 }
 745
 746                 buflen -= buffer[0];
 747                 buffer += buffer[0];
 748         }
 749
 750         /* Parse the alternate settings to find the maximum bandwidth. */
 751         for (i = 0; i < intf->num_altsetting; ++i) {
 752                 struct usb_host_endpoint *ep;
 753                 alts = &intf->altsetting[i];
 754                 ep = uvc_find_endpoint(alts,
 755                                 streaming->header.bEndpointAddress);
 756                 if (ep == NULL)
 757                         continue;
 758
 759                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 760                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 761                 if (psize > streaming->maxpsize)
 762                         streaming->maxpsize = psize;
 763         }
 764
 765         list_add_tail(&streaming->list, &dev->streaming);
 766         return 0;
 767
 768 error:
 769         usb_driver_release_interface(&uvc_driver.driver, intf);
 770         usb_put_intf(intf);
 771         kfree(streaming->format);
 772         kfree(streaming->header.bmaControls);
 773         kfree(streaming);
 774         return ret;
 775 }
 776
 777 /* Parse vendor-specific extensions. */
 778 static int uvc_parse_vendor_control(struct uvc_device *dev,
 779         const unsigned char *buffer, int buflen)
 780 {
 781         struct usb_device *udev = dev->udev;
 782         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 783         struct uvc_entity *unit;
 784         unsigned int n, p;
 785         int handled = 0;
 786
 787         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 788         case 0x046d:            /* Logitech */
 789                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 790                         break;
 791
 792                 /* Logitech implements several vendor specific functions
 793                  * through vendor specific extension units (LXU).
 794                  *
 795                  * The LXU descriptors are similar to XU descriptors
 796                  * (see "USB Device Video Class for Video Devices", section
 797                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 798                  * differences:
 799                  *
 800                  * ----------------------------------------------------------
 801                  * 0            bLength         1        Number
 802                  *      Size of this descriptor, in bytes: 24+p+n*2
 803                  * ----------------------------------------------------------
 804                  * 23+p+n       bmControlsType  N       Bitmap
 805                  *      Individual bits in the set are defined:
 806                  *      0: Absolute
 807                  *      1: Relative
 808                  *
 809                  *      This bitset is mapped exactly the same as bmControls.
 810                  * ----------------------------------------------------------
 811                  * 23+p+n*2     bReserved       1       Boolean
 812                  * ----------------------------------------------------------
 813                  * 24+p+n*2     iExtension      1       Index
 814                  *      Index of a string descriptor that describes this
 815                  *      extension unit.
 816                  * ----------------------------------------------------------
 817                  */
 818                 p = buflen >= 22 ? buffer[21] : 0;
 819                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 820
 821                 if (buflen < 25 + p + 2*n) {
 822                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 823                                 "interface %d EXTENSION_UNIT error\n",
 824                                 udev->devnum, alts->desc.bInterfaceNumber);
 825                         break;
 826                 }
 827
 828                 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
 829                 if (unit == NULL)
 830                         return -ENOMEM;
 831
 832                 unit->id = buffer[3];
 833                 unit->type = VC_EXTENSION_UNIT;
 834                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 835                 unit->extension.bNumControls = buffer[20];
 836                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
 837                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
 838                 memcpy(unit->extension.baSourceID, &buffer[22], p);
 839                 unit->extension.bControlSize = buffer[22+p];
 840                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
 841                 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
 842                                                + p + n;
 843                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 844
 845                 if (buffer[24+p+2*n] != 0)
 846                         usb_string(udev, buffer[24+p+2*n], unit->name,
 847                                    sizeof unit->name);
 848                 else
 849                         sprintf(unit->name, "Extension %u", buffer[3]);
 850
 851                 list_add_tail(&unit->list, &dev->entities);
 852                 handled = 1;
 853                 break;
 854         }
 855
 856         return handled;
 857 }
 858
 859 static int uvc_parse_standard_control(struct uvc_device *dev,
 860         const unsigned char *buffer, int buflen)
 861 {
 862         struct usb_device *udev = dev->udev;
 863         struct uvc_entity *unit, *term;
 864         struct usb_interface *intf;
 865         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 866         unsigned int i, n, p, len;
 867         __u16 type;
 868
 869         switch (buffer[2]) {
 870         case VC_HEADER:
 871                 n = buflen >= 12 ? buffer[11] : 0;
 872
 873                 if (buflen < 12 || buflen < 12 + n) {
 874                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 875                                 "interface %d HEADER error\n", udev->devnum,
 876                                 alts->desc.bInterfaceNumber);
 877                         return -EINVAL;
 878                 }
 879
 880                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 881                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 882
 883                 /* Parse all USB Video Streaming interfaces. */
 884                 for (i = 0; i < n; ++i) {
 885                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 886                         if (intf == NULL) {
 887                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 888                                         "interface %d doesn't exists\n",
 889                                         udev->devnum, i);
 890                                 continue;
 891                         }
 892
 893                         uvc_parse_streaming(dev, intf);
 894                 }
 895                 break;
 896
 897         case VC_INPUT_TERMINAL:
 898                 if (buflen < 8) {
 899                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 900                                 "interface %d INPUT_TERMINAL error\n",
 901                                 udev->devnum, alts->desc.bInterfaceNumber);
 902                         return -EINVAL;
 903                 }
 904
 905                 /* Make sure the terminal type MSB is not null, otherwise it
 906                  * could be confused with a unit.
 907                  */
 908                 type = get_unaligned_le16(&buffer[4]);
 909                 if ((type & 0xff00) == 0) {
 910                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 911                                 "interface %d INPUT_TERMINAL %d has invalid "
 912                                 "type 0x%04x, skipping\n", udev->devnum,
 913                                 alts->desc.bInterfaceNumber,
 914                                 buffer[3], type);
 915                         return 0;
 916                 }
 917
 918                 n = 0;
 919                 p = 0;
 920                 len = 8;
 921
 922                 if (type == ITT_CAMERA) {
 923                         n = buflen >= 15 ? buffer[14] : 0;
 924                         len = 15;
 925
 926                 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
 927                         n = buflen >= 9 ? buffer[8] : 0;
 928                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 929                         len = 10;
 930                 }
 931
 932                 if (buflen < len + n + p) {
 933                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 934                                 "interface %d INPUT_TERMINAL error\n",
 935                                 udev->devnum, alts->desc.bInterfaceNumber);
 936                         return -EINVAL;
 937                 }
 938
 939                 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
 940                 if (term == NULL)
 941                         return -ENOMEM;
 942
 943                 term->id = buffer[3];
 944                 term->type = type | UVC_TERM_INPUT;
 945
 946                 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
 947                         term->camera.bControlSize = n;
 948                         term->camera.bmControls = (__u8 *)term + sizeof *term;
 949                         term->camera.wObjectiveFocalLengthMin =
 950                                 get_unaligned_le16(&buffer[8]);
 951                         term->camera.wObjectiveFocalLengthMax =
 952                                 get_unaligned_le16(&buffer[10]);
 953                         term->camera.wOcularFocalLength =
 954                                 get_unaligned_le16(&buffer[12]);
 955                         memcpy(term->camera.bmControls, &buffer[15], n);
 956                 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
 957                         term->media.bControlSize = n;
 958                         term->media.bmControls = (__u8 *)term + sizeof *term;
 959                         term->media.bTransportModeSize = p;
 960                         term->media.bmTransportModes = (__u8 *)term
 961                                                      + sizeof *term + n;
 962                         memcpy(term->media.bmControls, &buffer[9], n);
 963                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
 964                 }
 965
 966                 if (buffer[7] != 0)
 967                         usb_string(udev, buffer[7], term->name,
 968                                    sizeof term->name);
 969                 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
 970                         sprintf(term->name, "Camera %u", buffer[3]);
 971                 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
 972                         sprintf(term->name, "Media %u", buffer[3]);
 973                 else
 974                         sprintf(term->name, "Input %u", buffer[3]);
 975
 976                 list_add_tail(&term->list, &dev->entities);
 977                 break;
 978
 979         case VC_OUTPUT_TERMINAL:
 980                 if (buflen < 9) {
 981                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 982                                 "interface %d OUTPUT_TERMINAL error\n",
 983                                 udev->devnum, alts->desc.bInterfaceNumber);
 984                         return -EINVAL;
 985                 }
 986
 987                 /* Make sure the terminal type MSB is not null, otherwise it
 988                  * could be confused with a unit.
 989                  */
 990                 type = get_unaligned_le16(&buffer[4]);
 991                 if ((type & 0xff00) == 0) {
 992                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 993                                 "interface %d OUTPUT_TERMINAL %d has invalid "
 994                                 "type 0x%04x, skipping\n", udev->devnum,
 995                                 alts->desc.bInterfaceNumber, buffer[3], type);
 996                         return 0;
 997                 }
 998
 999                 term = kzalloc(sizeof *term, GFP_KERNEL);
1000                 if (term == NULL)
1001                         return -ENOMEM;
1002
1003                 term->id = buffer[3];
1004                 term->type = type | UVC_TERM_OUTPUT;
1005                 term->output.bSourceID = buffer[7];
1006
1007                 if (buffer[8] != 0)
1008                         usb_string(udev, buffer[8], term->name,
1009                                    sizeof term->name);
1010                 else
1011                         sprintf(term->name, "Output %u", buffer[3]);
1012
1013                 list_add_tail(&term->list, &dev->entities);
1014                 break;
1015
1016         case VC_SELECTOR_UNIT:
1017                 p = buflen >= 5 ? buffer[4] : 0;
1018
1019                 if (buflen < 5 || buflen < 6 + p) {
1020                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1021                                 "interface %d SELECTOR_UNIT error\n",
1022                                 udev->devnum, alts->desc.bInterfaceNumber);
1023                         return -EINVAL;
1024                 }
1025
1026                 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1027                 if (unit == NULL)
1028                         return -ENOMEM;
1029
1030                 unit->id = buffer[3];
1031                 unit->type = buffer[2];
1032                 unit->selector.bNrInPins = buffer[4];
1033                 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1034                 memcpy(unit->selector.baSourceID, &buffer[5], p);
1035
1036                 if (buffer[5+p] != 0)
1037                         usb_string(udev, buffer[5+p], unit->name,
1038                                    sizeof unit->name);
1039                 else
1040                         sprintf(unit->name, "Selector %u", buffer[3]);
1041
1042                 list_add_tail(&unit->list, &dev->entities);
1043                 break;
1044
1045         case VC_PROCESSING_UNIT:
1046                 n = buflen >= 8 ? buffer[7] : 0;
1047                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1048
1049                 if (buflen < p + n) {
1050                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1051                                 "interface %d PROCESSING_UNIT error\n",
1052                                 udev->devnum, alts->desc.bInterfaceNumber);
1053                         return -EINVAL;
1054                 }
1055
1056                 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1057                 if (unit == NULL)
1058                         return -ENOMEM;
1059
1060                 unit->id = buffer[3];
1061                 unit->type = buffer[2];
1062                 unit->processing.bSourceID = buffer[4];
1063                 unit->processing.wMaxMultiplier =
1064                         get_unaligned_le16(&buffer[5]);
1065                 unit->processing.bControlSize = buffer[7];
1066                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1067                 memcpy(unit->processing.bmControls, &buffer[8], n);
1068                 if (dev->uvc_version >= 0x0110)
1069                         unit->processing.bmVideoStandards = buffer[9+n];
1070
1071                 if (buffer[8+n] != 0)
1072                         usb_string(udev, buffer[8+n], unit->name,
1073                                    sizeof unit->name);
1074                 else
1075                         sprintf(unit->name, "Processing %u", buffer[3]);
1076
1077                 list_add_tail(&unit->list, &dev->entities);
1078                 break;
1079
1080         case VC_EXTENSION_UNIT:
1081                 p = buflen >= 22 ? buffer[21] : 0;
1082                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1083
1084                 if (buflen < 24 + p + n) {
1085                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1086                                 "interface %d EXTENSION_UNIT error\n",
1087                                 udev->devnum, alts->desc.bInterfaceNumber);
1088                         return -EINVAL;
1089                 }
1090
1091                 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1092                 if (unit == NULL)
1093                         return -ENOMEM;
1094
1095                 unit->id = buffer[3];
1096                 unit->type = buffer[2];
1097                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1098                 unit->extension.bNumControls = buffer[20];
1099                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
1100                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1101                 memcpy(unit->extension.baSourceID, &buffer[22], p);
1102                 unit->extension.bControlSize = buffer[22+p];
1103                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1104                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1105
1106                 if (buffer[23+p+n] != 0)
1107                         usb_string(udev, buffer[23+p+n], unit->name,
1108                                    sizeof unit->name);
1109                 else
1110                         sprintf(unit->name, "Extension %u", buffer[3]);
1111
1112                 list_add_tail(&unit->list, &dev->entities);
1113                 break;
1114
1115         default:
1116                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1117                         "descriptor (%u)\n", buffer[2]);
1118                 break;
1119         }
1120
1121         return 0;
1122 }
1123
1124 static int uvc_parse_control(struct uvc_device *dev)
1125 {
1126         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1127         unsigned char *buffer = alts->extra;
1128         int buflen = alts->extralen;
1129         int ret;
1130
1131         /* Parse the default alternate setting only, as the UVC specification
1132          * defines a single alternate setting, the default alternate setting
1133          * zero.
1134          */
1135
1136         while (buflen > 2) {
1137                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1138                     buffer[1] != USB_DT_CS_INTERFACE)
1139                         goto next_descriptor;
1140
1141                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1142                         return ret;
1143
1144 next_descriptor:
1145                 buflen -= buffer[0];
1146                 buffer += buffer[0];
1147         }
1148
1149         /* Check if the optional status endpoint is present. */
1150         if (alts->desc.bNumEndpoints == 1) {
1151                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1152                 struct usb_endpoint_descriptor *desc = &ep->desc;
1153
1154                 if (usb_endpoint_is_int_in(desc) &&
1155                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1156                     desc->bInterval != 0) {
1157                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1158                                 "(addr %02x).\n", desc->bEndpointAddress);
1159                         dev->int_ep = ep;
1160                 }
1161         }
1162
1163         return 0;
1164 }
1165
1166 /* ------------------------------------------------------------------------
1167  * USB probe and disconnect
1168  */
1169
1170 /*
1171  * Unregister the video devices.
1172  */
1173 static void uvc_unregister_video(struct uvc_device *dev)
1174 {
1175         if (dev->video.vdev) {
1176                 if (dev->video.vdev->minor == -1)
1177                         video_device_release(dev->video.vdev);
1178                 else
1179                         video_unregister_device(dev->video.vdev);
1180                 dev->video.vdev = NULL;
1181         }
1182 }
1183
1184 /*
1185  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1186  * and containing the following units:
1187  *
1188  * - a USB Streaming Output Terminal
1189  * - zero or one Processing Unit
1190  * - zero, one or mode single-input Selector Units
1191  * - zero or one multiple-input Selector Units, provided all inputs are
1192  *   connected to input terminals
1193  * - zero, one or mode single-input Extension Units
1194  * - one Camera Input Terminal, or one or more External terminals.
1195  *
1196  * A side forward scan is made on each detected entity to check for additional
1197  * extension units.
1198  */
1199 static int uvc_scan_chain_entity(struct uvc_video_device *video,
1200         struct uvc_entity *entity)
1201 {
1202         switch (UVC_ENTITY_TYPE(entity)) {
1203         case VC_EXTENSION_UNIT:
1204                 if (uvc_trace_param & UVC_TRACE_PROBE)
1205                         printk(" <- XU %d", entity->id);
1206
1207                 if (entity->extension.bNrInPins != 1) {
1208                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1209                                 "than 1 input pin.\n", entity->id);
1210                         return -1;
1211                 }
1212
1213                 list_add_tail(&entity->chain, &video->extensions);
1214                 break;
1215
1216         case VC_PROCESSING_UNIT:
1217                 if (uvc_trace_param & UVC_TRACE_PROBE)
1218                         printk(" <- PU %d", entity->id);
1219
1220                 if (video->processing != NULL) {
1221                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1222                                 "Processing Units in chain.\n");
1223                         return -1;
1224                 }
1225
1226                 video->processing = entity;
1227                 break;
1228
1229         case VC_SELECTOR_UNIT:
1230                 if (uvc_trace_param & UVC_TRACE_PROBE)
1231                         printk(" <- SU %d", entity->id);
1232
1233                 /* Single-input selector units are ignored. */
1234                 if (entity->selector.bNrInPins == 1)
1235                         break;
1236
1237                 if (video->selector != NULL) {
1238                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1239                                 "Units in chain.\n");
1240                         return -1;
1241                 }
1242
1243                 video->selector = entity;
1244                 break;
1245
1246         case ITT_VENDOR_SPECIFIC:
1247         case ITT_CAMERA:
1248         case ITT_MEDIA_TRANSPORT_INPUT:
1249                 if (uvc_trace_param & UVC_TRACE_PROBE)
1250                         printk(" <- IT %d\n", entity->id);
1251
1252                 list_add_tail(&entity->chain, &video->iterms);
1253                 break;
1254
1255         default:
1256                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1257                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1258                 return -1;
1259         }
1260
1261         return 0;
1262 }
1263
1264 static int uvc_scan_chain_forward(struct uvc_video_device *video,
1265         struct uvc_entity *entity, struct uvc_entity *prev)
1266 {
1267         struct uvc_entity *forward;
1268         int found;
1269
1270         /* Forward scan */
1271         forward = NULL;
1272         found = 0;
1273
1274         while (1) {
1275                 forward = uvc_entity_by_reference(video->dev, entity->id,
1276                         forward);
1277                 if (forward == NULL)
1278                         break;
1279
1280                 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1281                     forward == prev)
1282                         continue;
1283
1284                 if (forward->extension.bNrInPins != 1) {
1285                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1286                                 "more than 1 input pin.\n", entity->id);
1287                         return -1;
1288                 }
1289
1290                 list_add_tail(&forward->chain, &video->extensions);
1291                 if (uvc_trace_param & UVC_TRACE_PROBE) {
1292                         if (!found)
1293                                 printk(" (-> XU");
1294
1295                         printk(" %d", forward->id);
1296                         found = 1;
1297                 }
1298         }
1299         if (found)
1300                 printk(")");
1301
1302         return 0;
1303 }
1304
1305 static int uvc_scan_chain_backward(struct uvc_video_device *video,
1306         struct uvc_entity *entity)
1307 {
1308         struct uvc_entity *term;
1309         int id = -1, i;
1310
1311         switch (UVC_ENTITY_TYPE(entity)) {
1312         case VC_EXTENSION_UNIT:
1313                 id = entity->extension.baSourceID[0];
1314                 break;
1315
1316         case VC_PROCESSING_UNIT:
1317                 id = entity->processing.bSourceID;
1318                 break;
1319
1320         case VC_SELECTOR_UNIT:
1321                 /* Single-input selector units are ignored. */
1322                 if (entity->selector.bNrInPins == 1) {
1323                         id = entity->selector.baSourceID[0];
1324                         break;
1325                 }
1326
1327                 if (uvc_trace_param & UVC_TRACE_PROBE)
1328                         printk(" <- IT");
1329
1330                 video->selector = entity;
1331                 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1332                         id = entity->selector.baSourceID[i];
1333                         term = uvc_entity_by_id(video->dev, id);
1334                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1335                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1336                                         "input %d isn't connected to an "
1337                                         "input terminal\n", entity->id, i);
1338                                 return -1;
1339                         }
1340
1341                         if (uvc_trace_param & UVC_TRACE_PROBE)
1342                                 printk(" %d", term->id);
1343
1344                         list_add_tail(&term->chain, &video->iterms);
1345                         uvc_scan_chain_forward(video, term, entity);
1346                 }
1347
1348                 if (uvc_trace_param & UVC_TRACE_PROBE)
1349                         printk("\n");
1350
1351                 id = 0;
1352                 break;
1353         }
1354
1355         return id;
1356 }
1357
1358 static int uvc_scan_chain(struct uvc_video_device *video)
1359 {
1360         struct uvc_entity *entity, *prev;
1361         int id;
1362
1363         entity = video->oterm;
1364         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1365         id = entity->output.bSourceID;
1366         while (id != 0) {
1367                 prev = entity;
1368                 entity = uvc_entity_by_id(video->dev, id);
1369                 if (entity == NULL) {
1370                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1371                                 "unknown entity %d.\n", id);
1372                         return -1;
1373                 }
1374
1375                 /* Process entity */
1376                 if (uvc_scan_chain_entity(video, entity) < 0)
1377                         return -1;
1378
1379                 /* Forward scan */
1380                 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1381                         return -1;
1382
1383                 /* Stop when a terminal is found. */
1384                 if (!UVC_ENTITY_IS_UNIT(entity))
1385                         break;
1386
1387                 /* Backward scan */
1388                 id = uvc_scan_chain_backward(video, entity);
1389                 if (id < 0)
1390                         return id;
1391         }
1392
1393         /* Initialize the video buffers queue. */
1394         uvc_queue_init(&video->queue);
1395
1396         return 0;
1397 }
1398
1399 /*
1400  * Register the video devices.
1401  *
1402  * The driver currently supports a single video device per control interface
1403  * only. The terminal and units must match the following structure:
1404  *
1405  * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1406  *
1407  * The Extension Units, if present, must have a single input pin. The
1408  * 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.
1411  */
1412 static int uvc_register_video(struct uvc_device *dev)
1413 {
1414         struct video_device *vdev;
1415         struct uvc_entity *term;
1416         int found = 0, ret;
1417
1418         /* Check if the control interface matches the structure we expect. */
1419         list_for_each_entry(term, &dev->entities, list) {
1420                 struct uvc_streaming *streaming;
1421
1422                 if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
1423                         continue;
1424
1425                 memset(&dev->video, 0, sizeof dev->video);
1426                 mutex_init(&dev->video.ctrl_mutex);
1427                 INIT_LIST_HEAD(&dev->video.iterms);
1428                 INIT_LIST_HEAD(&dev->video.extensions);
1429                 dev->video.oterm = term;
1430                 dev->video.dev = dev;
1431                 if (uvc_scan_chain(&dev->video) < 0)
1432                         continue;
1433
1434                 list_for_each_entry(streaming, &dev->streaming, list) {
1435                         if (streaming->header.bTerminalLink == term->id) {
1436                                 dev->video.streaming = streaming;
1437                                 found = 1;
1438                                 break;
1439                         }
1440                 }
1441
1442                 if (found)
1443                         break;
1444         }
1445
1446         if (!found) {
1447                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1448                 return -1;
1449         }
1450
1451         if (uvc_trace_param & UVC_TRACE_PROBE) {
1452                 uvc_printk(KERN_INFO, "Found a valid video chain (");
1453                 list_for_each_entry(term, &dev->video.iterms, chain) {
1454                         printk("%d", term->id);
1455                         if (term->chain.next != &dev->video.iterms)
1456                                 printk(",");
1457                 }
1458                 printk(" -> %d).\n", dev->video.oterm->id);
1459         }
1460
1461         /* Initialize the streaming interface with default streaming
1462          * parameters.
1463          */
1464         if ((ret = uvc_video_init(&dev->video)) < 0) {
1465                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1466                         "(%d).\n", ret);
1467                 return ret;
1468         }
1469
1470         /* Register the device with V4L. */
1471         vdev = video_device_alloc();
1472         if (vdev == NULL)
1473                 return -1;
1474
1475         /* We already hold a reference to dev->udev. The video device will be
1476          * unregistered before the reference is released, so we don't need to
1477          * get another one.
1478          */
1479         vdev->parent = &dev->intf->dev;
1480         vdev->minor = -1;
1481         vdev->fops = &uvc_fops;
1482         vdev->release = video_device_release;
1483         strncpy(vdev->name, dev->name, sizeof vdev->name);
1484
1485         /* Set the driver data before calling video_register_device, otherwise
1486          * uvc_v4l2_open might race us.
1487          *
1488          * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1489          *        problem ? Does any function which could be called here get
1490          *        a pointer to the usb_interface ?
1491          */
1492         dev->video.vdev = vdev;
1493         video_set_drvdata(vdev, &dev->video);
1494
1495         if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1496                 dev->video.vdev = NULL;
1497                 video_device_release(vdev);
1498                 return -1;
1499         }
1500
1501         return 0;
1502 }
1503
1504 /*
1505  * Delete the UVC device.
1506  *
1507  * Called by the kernel when the last reference to the uvc_device structure
1508  * is released.
1509  *
1510  * Unregistering the video devices is done here because every opened instance
1511  * must be closed before the device can be unregistered. An alternative would
1512  * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1513  * unregister the video devices on disconnect when that reference count drops
1514  * to zero.
1515  *
1516  * As this function is called after or during disconnect(), all URBs have
1517  * already been canceled by the USB core. There is no need to kill the
1518  * interrupt URB manually.
1519  */
1520 void uvc_delete(struct kref *kref)
1521 {
1522         struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1523         struct list_head *p, *n;
1524
1525         /* Unregister the video device */
1526         uvc_unregister_video(dev);
1527         usb_put_intf(dev->intf);
1528         usb_put_dev(dev->udev);
1529
1530         uvc_status_cleanup(dev);
1531         uvc_ctrl_cleanup_device(dev);
1532
1533         list_for_each_safe(p, n, &dev->entities) {
1534                 struct uvc_entity *entity;
1535                 entity = list_entry(p, struct uvc_entity, list);
1536                 kfree(entity);
1537         }
1538
1539         list_for_each_safe(p, n, &dev->streaming) {
1540                 struct uvc_streaming *streaming;
1541                 streaming = list_entry(p, struct uvc_streaming, list);
1542                 usb_driver_release_interface(&uvc_driver.driver,
1543                         streaming->intf);
1544                 usb_put_intf(streaming->intf);
1545                 kfree(streaming->format);
1546                 kfree(streaming->header.bmaControls);
1547                 kfree(streaming);
1548         }
1549
1550         kfree(dev);
1551 }
1552
1553 static int uvc_probe(struct usb_interface *intf,
1554                      const struct usb_device_id *id)
1555 {
1556         struct usb_device *udev = interface_to_usbdev(intf);
1557         struct uvc_device *dev;
1558         int ret;
1559
1560         if (id->idVendor && id->idProduct)
1561                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1562                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1563                                 id->idProduct);
1564         else
1565                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1566                                 udev->devpath);
1567
1568         /* Allocate memory for the device and initialize it */
1569         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1570                 return -ENOMEM;
1571
1572         INIT_LIST_HEAD(&dev->entities);
1573         INIT_LIST_HEAD(&dev->streaming);
1574         kref_init(&dev->kref);
1575
1576         dev->udev = usb_get_dev(udev);
1577         dev->intf = usb_get_intf(intf);
1578         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1579         dev->quirks = id->driver_info | uvc_quirks_param;
1580
1581         if (udev->product != NULL)
1582                 strncpy(dev->name, udev->product, sizeof dev->name);
1583         else
1584                 snprintf(dev->name, sizeof dev->name,
1585                         "UVC Camera (%04x:%04x)",
1586                         le16_to_cpu(udev->descriptor.idVendor),
1587                         le16_to_cpu(udev->descriptor.idProduct));
1588
1589         /* Parse the Video Class control descriptor */
1590         if (uvc_parse_control(dev) < 0) {
1591                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1592                         "descriptors.\n");
1593                 goto error;
1594         }
1595
1596         uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1597                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1598                 udev->product ? udev->product : "<unnamed>",
1599                 le16_to_cpu(udev->descriptor.idVendor),
1600                 le16_to_cpu(udev->descriptor.idProduct));
1601
1602         if (uvc_quirks_param != 0) {
1603                 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1604                         "parameter for testing purpose.\n", uvc_quirks_param);
1605                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1606                         "linux-uvc-devel mailing list.\n");
1607         }
1608
1609         /* Initialize controls */
1610         if (uvc_ctrl_init_device(dev) < 0)
1611                 goto error;
1612
1613         /* Register the video devices */
1614         if (uvc_register_video(dev) < 0)
1615                 goto error;
1616
1617         /* Save our data pointer in the interface data */
1618         usb_set_intfdata(intf, dev);
1619
1620         /* Initialize the interrupt URB */
1621         if ((ret = uvc_status_init(dev)) < 0) {
1622                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1623                         "endpoint (%d), status interrupt will not be "
1624                         "supported.\n", ret);
1625         }
1626
1627         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1628         return 0;
1629
1630 error:
1631         kref_put(&dev->kref, uvc_delete);
1632         return -ENODEV;
1633 }
1634
1635 static void uvc_disconnect(struct usb_interface *intf)
1636 {
1637         struct uvc_device *dev = usb_get_intfdata(intf);
1638
1639         /* Set the USB interface data to NULL. This can be done outside the
1640          * lock, as there's no other reader.
1641          */
1642         usb_set_intfdata(intf, NULL);
1643
1644         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1645                 return;
1646
1647         /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1648          * lock is needed to prevent uvc_disconnect from releasing its
1649          * reference to the uvc_device instance after uvc_v4l2_open() received
1650          * the pointer to the device (video_devdata) but before it got the
1651          * chance to increase the reference count (kref_get).
1652          *
1653          * Note that the reference can't be released with the lock held,
1654          * otherwise a AB-BA deadlock can occur with videodev_lock that
1655          * videodev acquires in videodev_open() and video_unregister_device().
1656          */
1657         mutex_lock(&uvc_driver.open_mutex);
1658         dev->state |= UVC_DEV_DISCONNECTED;
1659         mutex_unlock(&uvc_driver.open_mutex);
1660
1661         kref_put(&dev->kref, uvc_delete);
1662 }
1663
1664 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1665 {
1666         struct uvc_device *dev = usb_get_intfdata(intf);
1667
1668         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1669                 intf->cur_altsetting->desc.bInterfaceNumber);
1670
1671         /* Controls are cached on the fly so they don't need to be saved. */
1672         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1673                 return uvc_status_suspend(dev);
1674
1675         if (dev->video.streaming->intf != intf) {
1676                 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1677                                 "interface mismatch.\n");
1678                 return -EINVAL;
1679         }
1680
1681         return uvc_video_suspend(&dev->video);
1682 }
1683
1684 static int __uvc_resume(struct usb_interface *intf, int reset)
1685 {
1686         struct uvc_device *dev = usb_get_intfdata(intf);
1687         int ret;
1688
1689         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1690                 intf->cur_altsetting->desc.bInterfaceNumber);
1691
1692         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1693                 if (reset && (ret = uvc_ctrl_resume_device(dev)) < 0)
1694                         return ret;
1695
1696                 return uvc_status_resume(dev);
1697         }
1698
1699         if (dev->video.streaming->intf != intf) {
1700                 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1701                                 "interface mismatch.\n");
1702                 return -EINVAL;
1703         }
1704
1705         return uvc_video_resume(&dev->video);
1706 }
1707
1708 static int uvc_resume(struct usb_interface *intf)
1709 {
1710         return __uvc_resume(intf, 0);
1711 }
1712
1713 static int uvc_reset_resume(struct usb_interface *intf)
1714 {
1715         return __uvc_resume(intf, 1);
1716 }
1717
1718 /* ------------------------------------------------------------------------
1719  * Driver initialization and cleanup
1720  */
1721
1722 /*
1723  * The Logitech cameras listed below have their interface class set to
1724  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1725  * though they are compliant.
1726  */
1727 static struct usb_device_id uvc_ids[] = {
1728         /* Microsoft Lifecam NX-6000 */
1729         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1730                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1731           .idVendor             = 0x045e,
1732           .idProduct            = 0x00f8,
1733           .bInterfaceClass      = USB_CLASS_VIDEO,
1734           .bInterfaceSubClass   = 1,
1735           .bInterfaceProtocol   = 0,
1736           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1737         /* Microsoft Lifecam VX-7000 */
1738         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1739                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1740           .idVendor             = 0x045e,
1741           .idProduct            = 0x0723,
1742           .bInterfaceClass      = USB_CLASS_VIDEO,
1743           .bInterfaceSubClass   = 1,
1744           .bInterfaceProtocol   = 0,
1745           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1746         /* Logitech Quickcam Fusion */
1747         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1748                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1749           .idVendor             = 0x046d,
1750           .idProduct            = 0x08c1,
1751           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1752           .bInterfaceSubClass   = 1,
1753           .bInterfaceProtocol   = 0 },
1754         /* Logitech Quickcam Orbit MP */
1755         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1756                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1757           .idVendor             = 0x046d,
1758           .idProduct            = 0x08c2,
1759           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1760           .bInterfaceSubClass   = 1,
1761           .bInterfaceProtocol   = 0 },
1762         /* Logitech Quickcam Pro for Notebook */
1763         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1764                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1765           .idVendor             = 0x046d,
1766           .idProduct            = 0x08c3,
1767           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1768           .bInterfaceSubClass   = 1,
1769           .bInterfaceProtocol   = 0 },
1770         /* Logitech Quickcam Pro 5000 */
1771         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1772                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1773           .idVendor             = 0x046d,
1774           .idProduct            = 0x08c5,
1775           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1776           .bInterfaceSubClass   = 1,
1777           .bInterfaceProtocol   = 0 },
1778         /* Logitech Quickcam OEM Dell Notebook */
1779         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1780                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1781           .idVendor             = 0x046d,
1782           .idProduct            = 0x08c6,
1783           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1784           .bInterfaceSubClass   = 1,
1785           .bInterfaceProtocol   = 0 },
1786         /* Logitech Quickcam OEM Cisco VT Camera II */
1787         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1788                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1789           .idVendor             = 0x046d,
1790           .idProduct            = 0x08c7,
1791           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1792           .bInterfaceSubClass   = 1,
1793           .bInterfaceProtocol   = 0 },
1794         /* Apple Built-In iSight */
1795         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1796                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1797           .idVendor             = 0x05ac,
1798           .idProduct            = 0x8501,
1799           .bInterfaceClass      = USB_CLASS_VIDEO,
1800           .bInterfaceSubClass   = 1,
1801           .bInterfaceProtocol   = 0,
1802           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1803                                 | UVC_QUIRK_BUILTIN_ISIGHT },
1804         /* Genesys Logic USB 2.0 PC Camera */
1805         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1806                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1807           .idVendor             = 0x05e3,
1808           .idProduct            = 0x0505,
1809           .bInterfaceClass      = USB_CLASS_VIDEO,
1810           .bInterfaceSubClass   = 1,
1811           .bInterfaceProtocol   = 0,
1812           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1813         /* MT6227 */
1814         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1815                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1816           .idVendor             = 0x0e8d,
1817           .idProduct            = 0x0004,
1818           .bInterfaceClass      = USB_CLASS_VIDEO,
1819           .bInterfaceSubClass   = 1,
1820           .bInterfaceProtocol   = 0,
1821           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1822         /* Syntek (HP Spartan) */
1823         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1824                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1825           .idVendor             = 0x174f,
1826           .idProduct            = 0x5212,
1827           .bInterfaceClass      = USB_CLASS_VIDEO,
1828           .bInterfaceSubClass   = 1,
1829           .bInterfaceProtocol   = 0,
1830           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1831         /* Syntek (Samsung Q310) */
1832         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1833                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1834           .idVendor             = 0x174f,
1835           .idProduct            = 0x5931,
1836           .bInterfaceClass      = USB_CLASS_VIDEO,
1837           .bInterfaceSubClass   = 1,
1838           .bInterfaceProtocol   = 0,
1839           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1840         /* Asus F9SG */
1841         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1842                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1843           .idVendor             = 0x174f,
1844           .idProduct            = 0x8a31,
1845           .bInterfaceClass      = USB_CLASS_VIDEO,
1846           .bInterfaceSubClass   = 1,
1847           .bInterfaceProtocol   = 0,
1848           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1849         /* Syntek (Asus U3S) */
1850         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1851                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1852           .idVendor             = 0x174f,
1853           .idProduct            = 0x8a33,
1854           .bInterfaceClass      = USB_CLASS_VIDEO,
1855           .bInterfaceSubClass   = 1,
1856           .bInterfaceProtocol   = 0,
1857           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1858         /* Lenovo Thinkpad SL500 */
1859         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1860                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1861           .idVendor             = 0x17ef,
1862           .idProduct            = 0x480b,
1863           .bInterfaceClass      = USB_CLASS_VIDEO,
1864           .bInterfaceSubClass   = 1,
1865           .bInterfaceProtocol   = 0,
1866           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1867         /* Ecamm Pico iMage */
1868         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1869                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1870           .idVendor             = 0x18cd,
1871           .idProduct            = 0xcafe,
1872           .bInterfaceClass      = USB_CLASS_VIDEO,
1873           .bInterfaceSubClass   = 1,
1874           .bInterfaceProtocol   = 0,
1875           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
1876         /* Bodelin ProScopeHR */
1877         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1878                                 | USB_DEVICE_ID_MATCH_DEV_HI
1879                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1880           .idVendor             = 0x19ab,
1881           .idProduct            = 0x1000,
1882           .bcdDevice_hi         = 0x0126,
1883           .bInterfaceClass      = USB_CLASS_VIDEO,
1884           .bInterfaceSubClass   = 1,
1885           .bInterfaceProtocol   = 0,
1886           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
1887         /* SiGma Micro USB Web Camera */
1888         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1889                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1890           .idVendor             = 0x1c4f,
1891           .idProduct            = 0x3000,
1892           .bInterfaceClass      = USB_CLASS_VIDEO,
1893           .bInterfaceSubClass   = 1,
1894           .bInterfaceProtocol   = 0,
1895           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1896                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT},
1897         /* Generic USB Video Class */
1898         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1899         {}
1900 };
1901
1902 MODULE_DEVICE_TABLE(usb, uvc_ids);
1903
1904 struct uvc_driver uvc_driver = {
1905         .driver = {
1906                 .name           = "uvcvideo",
1907                 .probe          = uvc_probe,
1908                 .disconnect     = uvc_disconnect,
1909                 .suspend        = uvc_suspend,
1910                 .resume         = uvc_resume,
1911                 .reset_resume   = uvc_reset_resume,
1912                 .id_table       = uvc_ids,
1913                 .supports_autosuspend = 1,
1914         },
1915 };
1916
1917 static int __init uvc_init(void)
1918 {
1919         int result;
1920
1921         INIT_LIST_HEAD(&uvc_driver.devices);
1922         INIT_LIST_HEAD(&uvc_driver.controls);
1923         mutex_init(&uvc_driver.open_mutex);
1924         mutex_init(&uvc_driver.ctrl_mutex);
1925
1926         uvc_ctrl_init();
1927
1928         result = usb_register(&uvc_driver.driver);
1929         if (result == 0)
1930                 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
1931         return result;
1932 }
1933
1934 static void __exit uvc_cleanup(void)
1935 {
1936         usb_deregister(&uvc_driver.driver);
1937 }
1938
1939 module_init(uvc_init);
1940 module_exit(uvc_cleanup);
1941
1942 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
1943 MODULE_PARM_DESC(quirks, "Forced device quirks");
1944 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
1945 MODULE_PARM_DESC(trace, "Trace level bitmask");
1946
1947 MODULE_AUTHOR(DRIVER_AUTHOR);
1948 MODULE_DESCRIPTION(DRIVER_DESC);
1949 MODULE_LICENSE("GPL");
1950 MODULE_VERSION(DRIVER_VERSION);
1951