drivers/media/video/uvc/uvc_driver.c

   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 and ouput devices compliant with the
  16  * 'USB 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 unsigned int uvc_no_drop_param;
  48 static unsigned int uvc_quirks_param;
  49 unsigned int uvc_trace_param;
  50
  51 /* ------------------------------------------------------------------------
  52  * Control, formats, ...
  53  */
  54
  55 static struct uvc_format_desc uvc_fmts[] = {
  56         {
  57                 .name           = "YUV 4:2:2 (YUYV)",
  58                 .guid           = UVC_GUID_FORMAT_YUY2,
  59                 .fcc            = V4L2_PIX_FMT_YUYV,
  60         },
  61         {
  62                 .name           = "YUV 4:2:0 (NV12)",
  63                 .guid           = UVC_GUID_FORMAT_NV12,
  64                 .fcc            = V4L2_PIX_FMT_NV12,
  65         },
  66         {
  67                 .name           = "MJPEG",
  68                 .guid           = UVC_GUID_FORMAT_MJPEG,
  69                 .fcc            = V4L2_PIX_FMT_MJPEG,
  70         },
  71         {
  72                 .name           = "YVU 4:2:0 (YV12)",
  73                 .guid           = UVC_GUID_FORMAT_YV12,
  74                 .fcc            = V4L2_PIX_FMT_YVU420,
  75         },
  76         {
  77                 .name           = "YUV 4:2:0 (I420)",
  78                 .guid           = UVC_GUID_FORMAT_I420,
  79                 .fcc            = V4L2_PIX_FMT_YUV420,
  80         },
  81         {
  82                 .name           = "YUV 4:2:2 (UYVY)",
  83                 .guid           = UVC_GUID_FORMAT_UYVY,
  84                 .fcc            = V4L2_PIX_FMT_UYVY,
  85         },
  86         {
  87                 .name           = "Greyscale",
  88                 .guid           = UVC_GUID_FORMAT_Y800,
  89                 .fcc            = V4L2_PIX_FMT_GREY,
  90         },
  91         {
  92                 .name           = "RGB Bayer",
  93                 .guid           = UVC_GUID_FORMAT_BY8,
  94                 .fcc            = V4L2_PIX_FMT_SBGGR8,
  95         },
  96 };
  97
  98 /* ------------------------------------------------------------------------
  99  * Utility functions
 100  */
 101
 102 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 103                 __u8 epaddr)
 104 {
 105         struct usb_host_endpoint *ep;
 106         unsigned int i;
 107
 108         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 109                 ep = &alts->endpoint[i];
 110                 if (ep->desc.bEndpointAddress == epaddr)
 111                         return ep;
 112         }
 113
 114         return NULL;
 115 }
 116
 117 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 118 {
 119         unsigned int len = ARRAY_SIZE(uvc_fmts);
 120         unsigned int i;
 121
 122         for (i = 0; i < len; ++i) {
 123                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 124                         return &uvc_fmts[i];
 125         }
 126
 127         return NULL;
 128 }
 129
 130 static __u32 uvc_colorspace(const __u8 primaries)
 131 {
 132         static const __u8 colorprimaries[] = {
 133                 0,
 134                 V4L2_COLORSPACE_SRGB,
 135                 V4L2_COLORSPACE_470_SYSTEM_M,
 136                 V4L2_COLORSPACE_470_SYSTEM_BG,
 137                 V4L2_COLORSPACE_SMPTE170M,
 138                 V4L2_COLORSPACE_SMPTE240M,
 139         };
 140
 141         if (primaries < ARRAY_SIZE(colorprimaries))
 142                 return colorprimaries[primaries];
 143
 144         return 0;
 145 }
 146
 147 /* Simplify a fraction using a simple continued fraction decomposition. The
 148  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 149  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 150  * arbitrary parameters to remove non-significative terms from the simple
 151  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 152  * respectively seems to give nice results.
 153  */
 154 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 155                 unsigned int n_terms, unsigned int threshold)
 156 {
 157         uint32_t *an;
 158         uint32_t x, y, r;
 159         unsigned int i, n;
 160
 161         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 162         if (an == NULL)
 163                 return;
 164
 165         /* Convert the fraction to a simple continued fraction. See
 166          * http://mathforum.org/dr.math/faq/faq.fractions.html
 167          * Stop if the current term is bigger than or equal to the given
 168          * threshold.
 169          */
 170         x = *numerator;
 171         y = *denominator;
 172
 173         for (n = 0; n < n_terms && y != 0; ++n) {
 174                 an[n] = x / y;
 175                 if (an[n] >= threshold) {
 176                         if (n < 2)
 177                                 n++;
 178                         break;
 179                 }
 180
 181                 r = x - an[n] * y;
 182                 x = y;
 183                 y = r;
 184         }
 185
 186         /* Expand the simple continued fraction back to an integer fraction. */
 187         x = 0;
 188         y = 1;
 189
 190         for (i = n; i > 0; --i) {
 191                 r = y;
 192                 y = an[i-1] * y + x;
 193                 x = r;
 194         }
 195
 196         *numerator = y;
 197         *denominator = x;
 198         kfree(an);
 199 }
 200
 201 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 202  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 203  * arithmetic only.
 204  */
 205 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 206 {
 207         uint32_t multiplier;
 208
 209         /* Saturate the result if the operation would overflow. */
 210         if (denominator == 0 ||
 211             numerator/denominator >= ((uint32_t)-1)/10000000)
 212                 return (uint32_t)-1;
 213
 214         /* Divide both the denominator and the multiplier by two until
 215          * numerator * multiplier doesn't overflow. If anyone knows a better
 216          * algorithm please let me know.
 217          */
 218         multiplier = 10000000;
 219         while (numerator > ((uint32_t)-1)/multiplier) {
 220                 multiplier /= 2;
 221                 denominator /= 2;
 222         }
 223
 224         return denominator ? numerator * multiplier / denominator : 0;
 225 }
 226
 227 /* ------------------------------------------------------------------------
 228  * Terminal and unit management
 229  */
 230
 231 static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 232 {
 233         struct uvc_entity *entity;
 234
 235         list_for_each_entry(entity, &dev->entities, list) {
 236                 if (entity->id == id)
 237                         return entity;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 244         int id, struct uvc_entity *entity)
 245 {
 246         unsigned int i;
 247
 248         if (entity == NULL)
 249                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 250
 251         list_for_each_entry_continue(entity, &dev->entities, list) {
 252                 switch (UVC_ENTITY_TYPE(entity)) {
 253                 case TT_STREAMING:
 254                         if (entity->output.bSourceID == id)
 255                                 return entity;
 256                         break;
 257
 258                 case VC_PROCESSING_UNIT:
 259                         if (entity->processing.bSourceID == id)
 260                                 return entity;
 261                         break;
 262
 263                 case VC_SELECTOR_UNIT:
 264                         for (i = 0; i < entity->selector.bNrInPins; ++i)
 265                                 if (entity->selector.baSourceID[i] == id)
 266                                         return entity;
 267                         break;
 268
 269                 case VC_EXTENSION_UNIT:
 270                         for (i = 0; i < entity->extension.bNrInPins; ++i)
 271                                 if (entity->extension.baSourceID[i] == id)
 272                                         return entity;
 273                         break;
 274                 }
 275         }
 276
 277         return NULL;
 278 }
 279
 280 /* ------------------------------------------------------------------------
 281  * Descriptors handling
 282  */
 283
 284 static int uvc_parse_format(struct uvc_device *dev,
 285         struct uvc_streaming *streaming, struct uvc_format *format,
 286         __u32 **intervals, unsigned char *buffer, int buflen)
 287 {
 288         struct usb_interface *intf = streaming->intf;
 289         struct usb_host_interface *alts = intf->cur_altsetting;
 290         struct uvc_format_desc *fmtdesc;
 291         struct uvc_frame *frame;
 292         const unsigned char *start = buffer;
 293         unsigned char *_buffer;
 294         unsigned int interval;
 295         unsigned int i, n;
 296         int _buflen;
 297         __u8 ftype;
 298
 299         format->type = buffer[2];
 300         format->index = buffer[3];
 301
 302         switch (buffer[2]) {
 303         case VS_FORMAT_UNCOMPRESSED:
 304         case VS_FORMAT_FRAME_BASED:
 305                 n = buffer[2] == VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 306                 if (buflen < n) {
 307                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 308                                "interface %d FORMAT error\n",
 309                                dev->udev->devnum,
 310                                alts->desc.bInterfaceNumber);
 311                         return -EINVAL;
 312                 }
 313
 314                 /* Find the format descriptor from its GUID. */
 315                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 316
 317                 if (fmtdesc != NULL) {
 318                         strncpy(format->name, fmtdesc->name,
 319                                 sizeof format->name);
 320                         format->fcc = fmtdesc->fcc;
 321                 } else {
 322                         uvc_printk(KERN_INFO, "Unknown video format "
 323                                 UVC_GUID_FORMAT "\n",
 324                                 UVC_GUID_ARGS(&buffer[5]));
 325                         snprintf(format->name, sizeof format->name,
 326                                 UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
 327                         format->fcc = 0;
 328                 }
 329
 330                 format->bpp = buffer[21];
 331                 if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
 332                         ftype = VS_FRAME_UNCOMPRESSED;
 333                 } else {
 334                         ftype = VS_FRAME_FRAME_BASED;
 335                         if (buffer[27])
 336                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 337                 }
 338                 break;
 339
 340         case VS_FORMAT_MJPEG:
 341                 if (buflen < 11) {
 342                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 343                                "interface %d FORMAT error\n",
 344                                dev->udev->devnum,
 345                                alts->desc.bInterfaceNumber);
 346                         return -EINVAL;
 347                 }
 348
 349                 strncpy(format->name, "MJPEG", sizeof format->name);
 350                 format->fcc = V4L2_PIX_FMT_MJPEG;
 351                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 352                 format->bpp = 0;
 353                 ftype = VS_FRAME_MJPEG;
 354                 break;
 355
 356         case VS_FORMAT_DV:
 357                 if (buflen < 9) {
 358                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 359                                "interface %d FORMAT error\n",
 360                                dev->udev->devnum,
 361                                alts->desc.bInterfaceNumber);
 362                         return -EINVAL;
 363                 }
 364
 365                 switch (buffer[8] & 0x7f) {
 366                 case 0:
 367                         strncpy(format->name, "SD-DV", sizeof format->name);
 368                         break;
 369                 case 1:
 370                         strncpy(format->name, "SDL-DV", sizeof format->name);
 371                         break;
 372                 case 2:
 373                         strncpy(format->name, "HD-DV", sizeof format->name);
 374                         break;
 375                 default:
 376                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 377                                "interface %d: unknown DV format %u\n",
 378                                dev->udev->devnum,
 379                                alts->desc.bInterfaceNumber, buffer[8]);
 380                         return -EINVAL;
 381                 }
 382
 383                 strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 384                         sizeof format->name);
 385
 386                 format->fcc = V4L2_PIX_FMT_DV;
 387                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 388                 format->bpp = 0;
 389                 ftype = 0;
 390
 391                 /* Create a dummy frame descriptor. */
 392                 frame = &format->frame[0];
 393                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 394                 frame->bFrameIntervalType = 1;
 395                 frame->dwDefaultFrameInterval = 1;
 396                 frame->dwFrameInterval = *intervals;
 397                 *(*intervals)++ = 1;
 398                 format->nframes = 1;
 399                 break;
 400
 401         case VS_FORMAT_MPEG2TS:
 402         case VS_FORMAT_STREAM_BASED:
 403                 /* Not supported yet. */
 404         default:
 405                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 406                        "interface %d unsupported format %u\n",
 407                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 408                        buffer[2]);
 409                 return -EINVAL;
 410         }
 411
 412         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 413
 414         buflen -= buffer[0];
 415         buffer += buffer[0];
 416
 417         /* Count the number of frame descriptors to test the bFrameIndex
 418          * field when parsing the descriptors. We can't rely on the
 419          * bNumFrameDescriptors field as some cameras don't initialize it
 420          * properly.
 421          */
 422         for (_buflen = buflen, _buffer = buffer;
 423              _buflen > 2 && _buffer[2] == ftype;
 424              _buflen -= _buffer[0], _buffer += _buffer[0])
 425                 format->nframes++;
 426
 427         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 428          * based formats have frame descriptors.
 429          */
 430         while (buflen > 2 && buffer[2] == ftype) {
 431                 if (ftype != VS_FRAME_FRAME_BASED)
 432                         n = buflen > 25 ? buffer[25] : 0;
 433                 else
 434                         n = buflen > 21 ? buffer[21] : 0;
 435
 436                 n = n ? n : 3;
 437
 438                 if (buflen < 26 + 4*n) {
 439                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 440                                "interface %d FRAME error\n", dev->udev->devnum,
 441                                alts->desc.bInterfaceNumber);
 442                         return -EINVAL;
 443                 }
 444
 445                 if (buffer[3] - 1 >= format->nframes) {
 446                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 447                                "interface %d frame index %u out of range\n",
 448                                dev->udev->devnum, alts->desc.bInterfaceNumber,
 449                                buffer[3]);
 450                         return -EINVAL;
 451                 }
 452
 453                 frame = &format->frame[buffer[3] - 1];
 454
 455                 frame->bFrameIndex = buffer[3];
 456                 frame->bmCapabilities = buffer[4];
 457                 frame->wWidth = get_unaligned_le16(&buffer[5]);
 458                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 459                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 460                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 461                 if (ftype != VS_FRAME_FRAME_BASED) {
 462                         frame->dwMaxVideoFrameBufferSize =
 463                                 get_unaligned_le32(&buffer[17]);
 464                         frame->dwDefaultFrameInterval =
 465                                 get_unaligned_le32(&buffer[21]);
 466                         frame->bFrameIntervalType = buffer[25];
 467                 } else {
 468                         frame->dwMaxVideoFrameBufferSize = 0;
 469                         frame->dwDefaultFrameInterval =
 470                                 get_unaligned_le32(&buffer[17]);
 471                         frame->bFrameIntervalType = buffer[21];
 472                 }
 473                 frame->dwFrameInterval = *intervals;
 474
 475                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 476                  * completely. Observed behaviours range from setting the
 477                  * value to 1.1x the actual frame size of hardwiring the
 478                  * 16 low bits to 0. This results in a higher than necessary
 479                  * memory usage as well as a wrong image size information. For
 480                  * uncompressed formats this can be fixed by computing the
 481                  * value from the frame size.
 482                  */
 483                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 484                         frame->dwMaxVideoFrameBufferSize = format->bpp
 485                                 * frame->wWidth * frame->wHeight / 8;
 486
 487                 /* Some bogus devices report dwMinFrameInterval equal to
 488                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 489                  * zero. Setting all null intervals to 1 fixes the problem and
 490                  * some other divisions by zero which could happen.
 491                  */
 492                 for (i = 0; i < n; ++i) {
 493                         interval = get_unaligned_le32(&buffer[26+4*i]);
 494                         *(*intervals)++ = interval ? interval : 1;
 495                 }
 496
 497                 /* Make sure that the default frame interval stays between
 498                  * the boundaries.
 499                  */
 500                 n -= frame->bFrameIntervalType ? 1 : 2;
 501                 frame->dwDefaultFrameInterval =
 502                         min(frame->dwFrameInterval[n],
 503                             max(frame->dwFrameInterval[0],
 504                                 frame->dwDefaultFrameInterval));
 505
 506                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 507                         frame->wWidth, frame->wHeight,
 508                         10000000/frame->dwDefaultFrameInterval,
 509                         (100000000/frame->dwDefaultFrameInterval)%10);
 510
 511                 buflen -= buffer[0];
 512                 buffer += buffer[0];
 513         }
 514
 515         if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
 516                 buflen -= buffer[0];
 517                 buffer += buffer[0];
 518         }
 519
 520         if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
 521                 if (buflen < 6) {
 522                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 523                                "interface %d COLORFORMAT error\n",
 524                                dev->udev->devnum,
 525                                alts->desc.bInterfaceNumber);
 526                         return -EINVAL;
 527                 }
 528
 529                 format->colorspace = uvc_colorspace(buffer[3]);
 530
 531                 buflen -= buffer[0];
 532                 buffer += buffer[0];
 533         }
 534
 535         return buffer - start;
 536 }
 537
 538 static int uvc_parse_streaming(struct uvc_device *dev,
 539         struct usb_interface *intf)
 540 {
 541         struct uvc_streaming *streaming = NULL;
 542         struct uvc_format *format;
 543         struct uvc_frame *frame;
 544         struct usb_host_interface *alts = &intf->altsetting[0];
 545         unsigned char *_buffer, *buffer = alts->extra;
 546         int _buflen, buflen = alts->extralen;
 547         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 548         unsigned int size, i, n, p;
 549         __u32 *interval;
 550         __u16 psize;
 551         int ret = -EINVAL;
 552
 553         if (intf->cur_altsetting->desc.bInterfaceSubClass
 554                 != SC_VIDEOSTREAMING) {
 555                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 556                         "video streaming interface\n", dev->udev->devnum,
 557                         intf->altsetting[0].desc.bInterfaceNumber);
 558                 return -EINVAL;
 559         }
 560
 561         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 562                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 563                         "claimed\n", dev->udev->devnum,
 564                         intf->altsetting[0].desc.bInterfaceNumber);
 565                 return -EINVAL;
 566         }
 567
 568         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 569         if (streaming == NULL) {
 570                 usb_driver_release_interface(&uvc_driver.driver, intf);
 571                 return -EINVAL;
 572         }
 573
 574         mutex_init(&streaming->mutex);
 575         streaming->intf = usb_get_intf(intf);
 576         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 577
 578         /* The Pico iMage webcam has its class-specific interface descriptors
 579          * after the endpoint descriptors.
 580          */
 581         if (buflen == 0) {
 582                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 583                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 584
 585                         if (ep->extralen == 0)
 586                                 continue;
 587
 588                         if (ep->extralen > 2 &&
 589                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 590                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 591                                         "from endpoint %u.\n", i);
 592                                 buffer = alts->endpoint[i].extra;
 593                                 buflen = alts->endpoint[i].extralen;
 594                                 break;
 595                         }
 596                 }
 597         }
 598
 599         /* Skip the standard interface descriptors. */
 600         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 601                 buflen -= buffer[0];
 602                 buffer += buffer[0];
 603         }
 604
 605         if (buflen <= 2) {
 606                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 607                         "interface descriptors found.\n");
 608                 goto error;
 609         }
 610
 611         /* Parse the header descriptor. */
 612         switch (buffer[2]) {
 613         case VS_OUTPUT_HEADER:
 614                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 615                 size = 9;
 616                 break;
 617
 618         case VS_INPUT_HEADER:
 619                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 620                 size = 13;
 621                 break;
 622
 623         default:
 624                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 625                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 626                         alts->desc.bInterfaceNumber);
 627                 goto error;
 628         }
 629
 630         p = buflen >= 4 ? buffer[3] : 0;
 631         n = buflen >= size ? buffer[size-1] : 0;
 632
 633         if (buflen < size + p*n) {
 634                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 635                         "interface %d HEADER descriptor is invalid.\n",
 636                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 637                 goto error;
 638         }
 639
 640         streaming->header.bNumFormats = p;
 641         streaming->header.bEndpointAddress = buffer[6];
 642         if (buffer[2] == VS_INPUT_HEADER) {
 643                 streaming->header.bmInfo = buffer[7];
 644                 streaming->header.bTerminalLink = buffer[8];
 645                 streaming->header.bStillCaptureMethod = buffer[9];
 646                 streaming->header.bTriggerSupport = buffer[10];
 647                 streaming->header.bTriggerUsage = buffer[11];
 648         } else {
 649                 streaming->header.bTerminalLink = buffer[7];
 650         }
 651         streaming->header.bControlSize = n;
 652
 653         streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
 654         if (streaming->header.bmaControls == NULL) {
 655                 ret = -ENOMEM;
 656                 goto error;
 657         }
 658
 659         memcpy(streaming->header.bmaControls, &buffer[size], p*n);
 660
 661         buflen -= buffer[0];
 662         buffer += buffer[0];
 663
 664         _buffer = buffer;
 665         _buflen = buflen;
 666
 667         /* Count the format and frame descriptors. */
 668         while (_buflen > 2) {
 669                 switch (_buffer[2]) {
 670                 case VS_FORMAT_UNCOMPRESSED:
 671                 case VS_FORMAT_MJPEG:
 672                 case VS_FORMAT_FRAME_BASED:
 673                         nformats++;
 674                         break;
 675
 676                 case VS_FORMAT_DV:
 677                         /* DV format has no frame descriptor. We will create a
 678                          * dummy frame descriptor with a dummy frame interval.
 679                          */
 680                         nformats++;
 681                         nframes++;
 682                         nintervals++;
 683                         break;
 684
 685                 case VS_FORMAT_MPEG2TS:
 686                 case VS_FORMAT_STREAM_BASED:
 687                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 688                                 "interface %d FORMAT %u is not supported.\n",
 689                                 dev->udev->devnum,
 690                                 alts->desc.bInterfaceNumber, _buffer[2]);
 691                         break;
 692
 693                 case VS_FRAME_UNCOMPRESSED:
 694                 case VS_FRAME_MJPEG:
 695                         nframes++;
 696                         if (_buflen > 25)
 697                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 698                         break;
 699
 700                 case VS_FRAME_FRAME_BASED:
 701                         nframes++;
 702                         if (_buflen > 21)
 703                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 704                         break;
 705                 }
 706
 707                 _buflen -= _buffer[0];
 708                 _buffer += _buffer[0];
 709         }
 710
 711         if (nformats == 0) {
 712                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 713                         "%d has no supported formats defined.\n",
 714                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 715                 goto error;
 716         }
 717
 718         size = nformats * sizeof *format + nframes * sizeof *frame
 719              + nintervals * sizeof *interval;
 720         format = kzalloc(size, GFP_KERNEL);
 721         if (format == NULL) {
 722                 ret = -ENOMEM;
 723                 goto error;
 724         }
 725
 726         frame = (struct uvc_frame *)&format[nformats];
 727         interval = (__u32 *)&frame[nframes];
 728
 729         streaming->format = format;
 730         streaming->nformats = nformats;
 731
 732         /* Parse the format descriptors. */
 733         while (buflen > 2) {
 734                 switch (buffer[2]) {
 735                 case VS_FORMAT_UNCOMPRESSED:
 736                 case VS_FORMAT_MJPEG:
 737                 case VS_FORMAT_DV:
 738                 case VS_FORMAT_FRAME_BASED:
 739                         format->frame = frame;
 740                         ret = uvc_parse_format(dev, streaming, format,
 741                                 &interval, buffer, buflen);
 742                         if (ret < 0)
 743                                 goto error;
 744
 745                         frame += format->nframes;
 746                         format++;
 747
 748                         buflen -= ret;
 749                         buffer += ret;
 750                         continue;
 751
 752                 default:
 753                         break;
 754                 }
 755
 756                 buflen -= buffer[0];
 757                 buffer += buffer[0];
 758         }
 759
 760         /* Parse the alternate settings to find the maximum bandwidth. */
 761         for (i = 0; i < intf->num_altsetting; ++i) {
 762                 struct usb_host_endpoint *ep;
 763                 alts = &intf->altsetting[i];
 764                 ep = uvc_find_endpoint(alts,
 765                                 streaming->header.bEndpointAddress);
 766                 if (ep == NULL)
 767                         continue;
 768
 769                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 770                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 771                 if (psize > streaming->maxpsize)
 772                         streaming->maxpsize = psize;
 773         }
 774
 775         list_add_tail(&streaming->list, &dev->streaming);
 776         return 0;
 777
 778 error:
 779         usb_driver_release_interface(&uvc_driver.driver, intf);
 780         usb_put_intf(intf);
 781         kfree(streaming->format);
 782         kfree(streaming->header.bmaControls);
 783         kfree(streaming);
 784         return ret;
 785 }
 786
 787 /* Parse vendor-specific extensions. */
 788 static int uvc_parse_vendor_control(struct uvc_device *dev,
 789         const unsigned char *buffer, int buflen)
 790 {
 791         struct usb_device *udev = dev->udev;
 792         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 793         struct uvc_entity *unit;
 794         unsigned int n, p;
 795         int handled = 0;
 796
 797         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 798         case 0x046d:            /* Logitech */
 799                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 800                         break;
 801
 802                 /* Logitech implements several vendor specific functions
 803                  * through vendor specific extension units (LXU).
 804                  *
 805                  * The LXU descriptors are similar to XU descriptors
 806                  * (see "USB Device Video Class for Video Devices", section
 807                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 808                  * differences:
 809                  *
 810                  * ----------------------------------------------------------
 811                  * 0            bLength         1        Number
 812                  *      Size of this descriptor, in bytes: 24+p+n*2
 813                  * ----------------------------------------------------------
 814                  * 23+p+n       bmControlsType  N       Bitmap
 815                  *      Individual bits in the set are defined:
 816                  *      0: Absolute
 817                  *      1: Relative
 818                  *
 819                  *      This bitset is mapped exactly the same as bmControls.
 820                  * ----------------------------------------------------------
 821                  * 23+p+n*2     bReserved       1       Boolean
 822                  * ----------------------------------------------------------
 823                  * 24+p+n*2     iExtension      1       Index
 824                  *      Index of a string descriptor that describes this
 825                  *      extension unit.
 826                  * ----------------------------------------------------------
 827                  */
 828                 p = buflen >= 22 ? buffer[21] : 0;
 829                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 830
 831                 if (buflen < 25 + p + 2*n) {
 832                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 833                                 "interface %d EXTENSION_UNIT error\n",
 834                                 udev->devnum, alts->desc.bInterfaceNumber);
 835                         break;
 836                 }
 837
 838                 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
 839                 if (unit == NULL)
 840                         return -ENOMEM;
 841
 842                 unit->id = buffer[3];
 843                 unit->type = VC_EXTENSION_UNIT;
 844                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 845                 unit->extension.bNumControls = buffer[20];
 846                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
 847                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
 848                 memcpy(unit->extension.baSourceID, &buffer[22], p);
 849                 unit->extension.bControlSize = buffer[22+p];
 850                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
 851                 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
 852                                                + p + n;
 853                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 854
 855                 if (buffer[24+p+2*n] != 0)
 856                         usb_string(udev, buffer[24+p+2*n], unit->name,
 857                                    sizeof unit->name);
 858                 else
 859                         sprintf(unit->name, "Extension %u", buffer[3]);
 860
 861                 list_add_tail(&unit->list, &dev->entities);
 862                 handled = 1;
 863                 break;
 864         }
 865
 866         return handled;
 867 }
 868
 869 static int uvc_parse_standard_control(struct uvc_device *dev,
 870         const unsigned char *buffer, int buflen)
 871 {
 872         struct usb_device *udev = dev->udev;
 873         struct uvc_entity *unit, *term;
 874         struct usb_interface *intf;
 875         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 876         unsigned int i, n, p, len;
 877         __u16 type;
 878
 879         switch (buffer[2]) {
 880         case VC_HEADER:
 881                 n = buflen >= 12 ? buffer[11] : 0;
 882
 883                 if (buflen < 12 || buflen < 12 + n) {
 884                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 885                                 "interface %d HEADER error\n", udev->devnum,
 886                                 alts->desc.bInterfaceNumber);
 887                         return -EINVAL;
 888                 }
 889
 890                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 891                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 892
 893                 /* Parse all USB Video Streaming interfaces. */
 894                 for (i = 0; i < n; ++i) {
 895                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 896                         if (intf == NULL) {
 897                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 898                                         "interface %d doesn't exists\n",
 899                                         udev->devnum, i);
 900                                 continue;
 901                         }
 902
 903                         uvc_parse_streaming(dev, intf);
 904                 }
 905                 break;
 906
 907         case VC_INPUT_TERMINAL:
 908                 if (buflen < 8) {
 909                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 910                                 "interface %d INPUT_TERMINAL error\n",
 911                                 udev->devnum, alts->desc.bInterfaceNumber);
 912                         return -EINVAL;
 913                 }
 914
 915                 /* Make sure the terminal type MSB is not null, otherwise it
 916                  * could be confused with a unit.
 917                  */
 918                 type = get_unaligned_le16(&buffer[4]);
 919                 if ((type & 0xff00) == 0) {
 920                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 921                                 "interface %d INPUT_TERMINAL %d has invalid "
 922                                 "type 0x%04x, skipping\n", udev->devnum,
 923                                 alts->desc.bInterfaceNumber,
 924                                 buffer[3], type);
 925                         return 0;
 926                 }
 927
 928                 n = 0;
 929                 p = 0;
 930                 len = 8;
 931
 932                 if (type == ITT_CAMERA) {
 933                         n = buflen >= 15 ? buffer[14] : 0;
 934                         len = 15;
 935
 936                 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
 937                         n = buflen >= 9 ? buffer[8] : 0;
 938                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 939                         len = 10;
 940                 }
 941
 942                 if (buflen < len + n + p) {
 943                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 944                                 "interface %d INPUT_TERMINAL error\n",
 945                                 udev->devnum, alts->desc.bInterfaceNumber);
 946                         return -EINVAL;
 947                 }
 948
 949                 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
 950                 if (term == NULL)
 951                         return -ENOMEM;
 952
 953                 term->id = buffer[3];
 954                 term->type = type | UVC_TERM_INPUT;
 955
 956                 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
 957                         term->camera.bControlSize = n;
 958                         term->camera.bmControls = (__u8 *)term + sizeof *term;
 959                         term->camera.wObjectiveFocalLengthMin =
 960                                 get_unaligned_le16(&buffer[8]);
 961                         term->camera.wObjectiveFocalLengthMax =
 962                                 get_unaligned_le16(&buffer[10]);
 963                         term->camera.wOcularFocalLength =
 964                                 get_unaligned_le16(&buffer[12]);
 965                         memcpy(term->camera.bmControls, &buffer[15], n);
 966                 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
 967                         term->media.bControlSize = n;
 968                         term->media.bmControls = (__u8 *)term + sizeof *term;
 969                         term->media.bTransportModeSize = p;
 970                         term->media.bmTransportModes = (__u8 *)term
 971                                                      + sizeof *term + n;
 972                         memcpy(term->media.bmControls, &buffer[9], n);
 973                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
 974                 }
 975
 976                 if (buffer[7] != 0)
 977                         usb_string(udev, buffer[7], term->name,
 978                                    sizeof term->name);
 979                 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
 980                         sprintf(term->name, "Camera %u", buffer[3]);
 981                 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
 982                         sprintf(term->name, "Media %u", buffer[3]);
 983                 else
 984                         sprintf(term->name, "Input %u", buffer[3]);
 985
 986                 list_add_tail(&term->list, &dev->entities);
 987                 break;
 988
 989         case VC_OUTPUT_TERMINAL:
 990                 if (buflen < 9) {
 991                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 992                                 "interface %d OUTPUT_TERMINAL error\n",
 993                                 udev->devnum, alts->desc.bInterfaceNumber);
 994                         return -EINVAL;
 995                 }
 996
 997                 /* Make sure the terminal type MSB is not null, otherwise it
 998                  * could be confused with a unit.
 999                  */
1000                 type = get_unaligned_le16(&buffer[4]);
1001                 if ((type & 0xff00) == 0) {
1002                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1003                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1004                                 "type 0x%04x, skipping\n", udev->devnum,
1005                                 alts->desc.bInterfaceNumber, buffer[3], type);
1006                         return 0;
1007                 }
1008
1009                 term = kzalloc(sizeof *term, GFP_KERNEL);
1010                 if (term == NULL)
1011                         return -ENOMEM;
1012
1013                 term->id = buffer[3];
1014                 term->type = type | UVC_TERM_OUTPUT;
1015                 term->output.bSourceID = buffer[7];
1016
1017                 if (buffer[8] != 0)
1018                         usb_string(udev, buffer[8], term->name,
1019                                    sizeof term->name);
1020                 else
1021                         sprintf(term->name, "Output %u", buffer[3]);
1022
1023                 list_add_tail(&term->list, &dev->entities);
1024                 break;
1025
1026         case VC_SELECTOR_UNIT:
1027                 p = buflen >= 5 ? buffer[4] : 0;
1028
1029                 if (buflen < 5 || buflen < 6 + p) {
1030                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1031                                 "interface %d SELECTOR_UNIT error\n",
1032                                 udev->devnum, alts->desc.bInterfaceNumber);
1033                         return -EINVAL;
1034                 }
1035
1036                 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1037                 if (unit == NULL)
1038                         return -ENOMEM;
1039
1040                 unit->id = buffer[3];
1041                 unit->type = buffer[2];
1042                 unit->selector.bNrInPins = buffer[4];
1043                 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1044                 memcpy(unit->selector.baSourceID, &buffer[5], p);
1045
1046                 if (buffer[5+p] != 0)
1047                         usb_string(udev, buffer[5+p], unit->name,
1048                                    sizeof unit->name);
1049                 else
1050                         sprintf(unit->name, "Selector %u", buffer[3]);
1051
1052                 list_add_tail(&unit->list, &dev->entities);
1053                 break;
1054
1055         case VC_PROCESSING_UNIT:
1056                 n = buflen >= 8 ? buffer[7] : 0;
1057                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1058
1059                 if (buflen < p + n) {
1060                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1061                                 "interface %d PROCESSING_UNIT error\n",
1062                                 udev->devnum, alts->desc.bInterfaceNumber);
1063                         return -EINVAL;
1064                 }
1065
1066                 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1067                 if (unit == NULL)
1068                         return -ENOMEM;
1069
1070                 unit->id = buffer[3];
1071                 unit->type = buffer[2];
1072                 unit->processing.bSourceID = buffer[4];
1073                 unit->processing.wMaxMultiplier =
1074                         get_unaligned_le16(&buffer[5]);
1075                 unit->processing.bControlSize = buffer[7];
1076                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1077                 memcpy(unit->processing.bmControls, &buffer[8], n);
1078                 if (dev->uvc_version >= 0x0110)
1079                         unit->processing.bmVideoStandards = buffer[9+n];
1080
1081                 if (buffer[8+n] != 0)
1082                         usb_string(udev, buffer[8+n], unit->name,
1083                                    sizeof unit->name);
1084                 else
1085                         sprintf(unit->name, "Processing %u", buffer[3]);
1086
1087                 list_add_tail(&unit->list, &dev->entities);
1088                 break;
1089
1090         case VC_EXTENSION_UNIT:
1091                 p = buflen >= 22 ? buffer[21] : 0;
1092                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1093
1094                 if (buflen < 24 + p + n) {
1095                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1096                                 "interface %d EXTENSION_UNIT error\n",
1097                                 udev->devnum, alts->desc.bInterfaceNumber);
1098                         return -EINVAL;
1099                 }
1100
1101                 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1102                 if (unit == NULL)
1103                         return -ENOMEM;
1104
1105                 unit->id = buffer[3];
1106                 unit->type = buffer[2];
1107                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1108                 unit->extension.bNumControls = buffer[20];
1109                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
1110                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1111                 memcpy(unit->extension.baSourceID, &buffer[22], p);
1112                 unit->extension.bControlSize = buffer[22+p];
1113                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1114                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1115
1116                 if (buffer[23+p+n] != 0)
1117                         usb_string(udev, buffer[23+p+n], unit->name,
1118                                    sizeof unit->name);
1119                 else
1120                         sprintf(unit->name, "Extension %u", buffer[3]);
1121
1122                 list_add_tail(&unit->list, &dev->entities);
1123                 break;
1124
1125         default:
1126                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1127                         "descriptor (%u)\n", buffer[2]);
1128                 break;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static int uvc_parse_control(struct uvc_device *dev)
1135 {
1136         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1137         unsigned char *buffer = alts->extra;
1138         int buflen = alts->extralen;
1139         int ret;
1140
1141         /* Parse the default alternate setting only, as the UVC specification
1142          * defines a single alternate setting, the default alternate setting
1143          * zero.
1144          */
1145
1146         while (buflen > 2) {
1147                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1148                     buffer[1] != USB_DT_CS_INTERFACE)
1149                         goto next_descriptor;
1150
1151                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1152                         return ret;
1153
1154 next_descriptor:
1155                 buflen -= buffer[0];
1156                 buffer += buffer[0];
1157         }
1158
1159         /* Check if the optional status endpoint is present. Built-in iSight
1160          * webcams have an interrupt endpoint but spit proprietary data that
1161          * don't conform to the UVC status endpoint messages. Don't try to
1162          * handle the interrupt endpoint for those cameras.
1163          */
1164         if (alts->desc.bNumEndpoints == 1 &&
1165             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1166                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1167                 struct usb_endpoint_descriptor *desc = &ep->desc;
1168
1169                 if (usb_endpoint_is_int_in(desc) &&
1170                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1171                     desc->bInterval != 0) {
1172                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1173                                 "(addr %02x).\n", desc->bEndpointAddress);
1174                         dev->int_ep = ep;
1175                 }
1176         }
1177
1178         return 0;
1179 }
1180
1181 /* ------------------------------------------------------------------------
1182  * USB probe and disconnect
1183  */
1184
1185 /*
1186  * Unregister the video devices.
1187  */
1188 static void uvc_unregister_video(struct uvc_device *dev)
1189 {
1190         if (dev->video.vdev) {
1191                 if (dev->video.vdev->minor == -1)
1192                         video_device_release(dev->video.vdev);
1193                 else
1194                         video_unregister_device(dev->video.vdev);
1195                 dev->video.vdev = NULL;
1196         }
1197 }
1198
1199 /*
1200  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1201  * and containing the following units:
1202  *
1203  * - a USB Streaming Output Terminal
1204  * - zero or one Processing Unit
1205  * - zero, one or mode single-input Selector Units
1206  * - zero or one multiple-input Selector Units, provided all inputs are
1207  *   connected to input terminals
1208  * - zero, one or mode single-input Extension Units
1209  * - one Camera Input Terminal, or one or more External terminals.
1210  *
1211  * A side forward scan is made on each detected entity to check for additional
1212  * extension units.
1213  */
1214 static int uvc_scan_chain_entity(struct uvc_video_device *video,
1215         struct uvc_entity *entity)
1216 {
1217         switch (UVC_ENTITY_TYPE(entity)) {
1218         case VC_EXTENSION_UNIT:
1219                 if (uvc_trace_param & UVC_TRACE_PROBE)
1220                         printk(" <- XU %d", entity->id);
1221
1222                 if (entity->extension.bNrInPins != 1) {
1223                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1224                                 "than 1 input pin.\n", entity->id);
1225                         return -1;
1226                 }
1227
1228                 list_add_tail(&entity->chain, &video->extensions);
1229                 break;
1230
1231         case VC_PROCESSING_UNIT:
1232                 if (uvc_trace_param & UVC_TRACE_PROBE)
1233                         printk(" <- PU %d", entity->id);
1234
1235                 if (video->processing != NULL) {
1236                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1237                                 "Processing Units in chain.\n");
1238                         return -1;
1239                 }
1240
1241                 video->processing = entity;
1242                 break;
1243
1244         case VC_SELECTOR_UNIT:
1245                 if (uvc_trace_param & UVC_TRACE_PROBE)
1246                         printk(" <- SU %d", entity->id);
1247
1248                 /* Single-input selector units are ignored. */
1249                 if (entity->selector.bNrInPins == 1)
1250                         break;
1251
1252                 if (video->selector != NULL) {
1253                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1254                                 "Units in chain.\n");
1255                         return -1;
1256                 }
1257
1258                 video->selector = entity;
1259                 break;
1260
1261         case ITT_VENDOR_SPECIFIC:
1262         case ITT_CAMERA:
1263         case ITT_MEDIA_TRANSPORT_INPUT:
1264                 if (uvc_trace_param & UVC_TRACE_PROBE)
1265                         printk(" <- IT %d\n", entity->id);
1266
1267                 list_add_tail(&entity->chain, &video->iterms);
1268                 break;
1269
1270         case TT_STREAMING:
1271                 if (uvc_trace_param & UVC_TRACE_PROBE)
1272                         printk(" <- IT %d\n", entity->id);
1273
1274                 if (!UVC_ENTITY_IS_ITERM(entity)) {
1275                         uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1276                                 "terminal %u.\n", entity->id);
1277                         return -1;
1278                 }
1279
1280                 if (video->sterm != NULL) {
1281                         uvc_trace(UVC_TRACE_DESCR, "Found multiple streaming "
1282                                 "entities in chain.\n");
1283                         return -1;
1284                 }
1285
1286                 list_add_tail(&entity->chain, &video->iterms);
1287                 video->sterm = entity;
1288                 break;
1289
1290         default:
1291                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1292                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1293                 return -1;
1294         }
1295
1296         return 0;
1297 }
1298
1299 static int uvc_scan_chain_forward(struct uvc_video_device *video,
1300         struct uvc_entity *entity, struct uvc_entity *prev)
1301 {
1302         struct uvc_entity *forward;
1303         int found;
1304
1305         /* Forward scan */
1306         forward = NULL;
1307         found = 0;
1308
1309         while (1) {
1310                 forward = uvc_entity_by_reference(video->dev, entity->id,
1311                         forward);
1312                 if (forward == NULL)
1313                         break;
1314
1315                 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1316                     forward == prev)
1317                         continue;
1318
1319                 if (forward->extension.bNrInPins != 1) {
1320                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1321                                 "more than 1 input pin.\n", entity->id);
1322                         return -1;
1323                 }
1324
1325                 list_add_tail(&forward->chain, &video->extensions);
1326                 if (uvc_trace_param & UVC_TRACE_PROBE) {
1327                         if (!found)
1328                                 printk(" (-> XU");
1329
1330                         printk(" %d", forward->id);
1331                         found = 1;
1332                 }
1333         }
1334         if (found)
1335                 printk(")");
1336
1337         return 0;
1338 }
1339
1340 static int uvc_scan_chain_backward(struct uvc_video_device *video,
1341         struct uvc_entity *entity)
1342 {
1343         struct uvc_entity *term;
1344         int id = -1, i;
1345
1346         switch (UVC_ENTITY_TYPE(entity)) {
1347         case VC_EXTENSION_UNIT:
1348                 id = entity->extension.baSourceID[0];
1349                 break;
1350
1351         case VC_PROCESSING_UNIT:
1352                 id = entity->processing.bSourceID;
1353                 break;
1354
1355         case VC_SELECTOR_UNIT:
1356                 /* Single-input selector units are ignored. */
1357                 if (entity->selector.bNrInPins == 1) {
1358                         id = entity->selector.baSourceID[0];
1359                         break;
1360                 }
1361
1362                 if (uvc_trace_param & UVC_TRACE_PROBE)
1363                         printk(" <- IT");
1364
1365                 video->selector = entity;
1366                 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1367                         id = entity->selector.baSourceID[i];
1368                         term = uvc_entity_by_id(video->dev, id);
1369                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1370                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1371                                         "input %d isn't connected to an "
1372                                         "input terminal\n", entity->id, i);
1373                                 return -1;
1374                         }
1375
1376                         if (uvc_trace_param & UVC_TRACE_PROBE)
1377                                 printk(" %d", term->id);
1378
1379                         list_add_tail(&term->chain, &video->iterms);
1380                         uvc_scan_chain_forward(video, term, entity);
1381                 }
1382
1383                 if (uvc_trace_param & UVC_TRACE_PROBE)
1384                         printk("\n");
1385
1386                 id = 0;
1387                 break;
1388         }
1389
1390         return id;
1391 }
1392
1393 static int uvc_scan_chain(struct uvc_video_device *video)
1394 {
1395         struct uvc_entity *entity, *prev;
1396         int id;
1397
1398         entity = video->oterm;
1399         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1400
1401         if (UVC_ENTITY_TYPE(entity) == TT_STREAMING)
1402                 video->sterm = entity;
1403
1404         id = entity->output.bSourceID;
1405         while (id != 0) {
1406                 prev = entity;
1407                 entity = uvc_entity_by_id(video->dev, id);
1408                 if (entity == NULL) {
1409                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1410                                 "unknown entity %d.\n", id);
1411                         return -1;
1412                 }
1413
1414                 /* Process entity */
1415                 if (uvc_scan_chain_entity(video, entity) < 0)
1416                         return -1;
1417
1418                 /* Forward scan */
1419                 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1420                         return -1;
1421
1422                 /* Stop when a terminal is found. */
1423                 if (!UVC_ENTITY_IS_UNIT(entity))
1424                         break;
1425
1426                 /* Backward scan */
1427                 id = uvc_scan_chain_backward(video, entity);
1428                 if (id < 0)
1429                         return id;
1430         }
1431
1432         if (video->sterm == NULL) {
1433                 uvc_trace(UVC_TRACE_DESCR, "No streaming entity found in "
1434                         "chain.\n");
1435                 return -1;
1436         }
1437
1438         return 0;
1439 }
1440
1441 /*
1442  * Register the video devices.
1443  *
1444  * The driver currently supports a single video device per control interface
1445  * only. The terminal and units must match the following structure:
1446  *
1447  * ITT_* -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1448  * TT_STREAMING -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> OTT_*
1449  *
1450  * The Extension Units, if present, must have a single input pin. The
1451  * Processing Unit and Extension Units can be in any order. Additional
1452  * Extension Units connected to the main chain as single-unit branches are
1453  * also supported.
1454  */
1455 static int uvc_register_video(struct uvc_device *dev)
1456 {
1457         struct video_device *vdev;
1458         struct uvc_entity *term;
1459         int found = 0, ret;
1460
1461         /* Check if the control interface matches the structure we expect. */
1462         list_for_each_entry(term, &dev->entities, list) {
1463                 struct uvc_streaming *streaming;
1464
1465                 if (!UVC_ENTITY_IS_TERM(term) || !UVC_ENTITY_IS_OTERM(term))
1466                         continue;
1467
1468                 memset(&dev->video, 0, sizeof dev->video);
1469                 mutex_init(&dev->video.ctrl_mutex);
1470                 INIT_LIST_HEAD(&dev->video.iterms);
1471                 INIT_LIST_HEAD(&dev->video.extensions);
1472                 dev->video.oterm = term;
1473                 dev->video.dev = dev;
1474                 if (uvc_scan_chain(&dev->video) < 0)
1475                         continue;
1476
1477                 list_for_each_entry(streaming, &dev->streaming, list) {
1478                         if (streaming->header.bTerminalLink ==
1479                             dev->video.sterm->id) {
1480                                 dev->video.streaming = streaming;
1481                                 found = 1;
1482                                 break;
1483                         }
1484                 }
1485
1486                 if (found)
1487                         break;
1488         }
1489
1490         if (!found) {
1491                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1492                 return -1;
1493         }
1494
1495         if (uvc_trace_param & UVC_TRACE_PROBE) {
1496                 uvc_printk(KERN_INFO, "Found a valid video chain (");
1497                 list_for_each_entry(term, &dev->video.iterms, chain) {
1498                         printk("%d", term->id);
1499                         if (term->chain.next != &dev->video.iterms)
1500                                 printk(",");
1501                 }
1502                 printk(" -> %d).\n", dev->video.oterm->id);
1503         }
1504
1505         /* Initialize the video buffers queue. */
1506         uvc_queue_init(&dev->video.queue, dev->video.streaming->type);
1507
1508         /* Initialize the streaming interface with default streaming
1509          * parameters.
1510          */
1511         if ((ret = uvc_video_init(&dev->video)) < 0) {
1512                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1513                         "(%d).\n", ret);
1514                 return ret;
1515         }
1516
1517         /* Register the device with V4L. */
1518         vdev = video_device_alloc();
1519         if (vdev == NULL)
1520                 return -1;
1521
1522         /* We already hold a reference to dev->udev. The video device will be
1523          * unregistered before the reference is released, so we don't need to
1524          * get another one.
1525          */
1526         vdev->parent = &dev->intf->dev;
1527         vdev->minor = -1;
1528         vdev->fops = &uvc_fops;
1529         vdev->release = video_device_release;
1530         strncpy(vdev->name, dev->name, sizeof vdev->name);
1531
1532         /* Set the driver data before calling video_register_device, otherwise
1533          * uvc_v4l2_open might race us.
1534          *
1535          * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1536          *        problem ? Does any function which could be called here get
1537          *        a pointer to the usb_interface ?
1538          */
1539         dev->video.vdev = vdev;
1540         video_set_drvdata(vdev, &dev->video);
1541
1542         if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1543                 dev->video.vdev = NULL;
1544                 video_device_release(vdev);
1545                 return -1;
1546         }
1547
1548         return 0;
1549 }
1550
1551 /*
1552  * Delete the UVC device.
1553  *
1554  * Called by the kernel when the last reference to the uvc_device structure
1555  * is released.
1556  *
1557  * Unregistering the video devices is done here because every opened instance
1558  * must be closed before the device can be unregistered. An alternative would
1559  * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1560  * unregister the video devices on disconnect when that reference count drops
1561  * to zero.
1562  *
1563  * As this function is called after or during disconnect(), all URBs have
1564  * already been canceled by the USB core. There is no need to kill the
1565  * interrupt URB manually.
1566  */
1567 void uvc_delete(struct kref *kref)
1568 {
1569         struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1570         struct list_head *p, *n;
1571
1572         /* Unregister the video device */
1573         uvc_unregister_video(dev);
1574         usb_put_intf(dev->intf);
1575         usb_put_dev(dev->udev);
1576
1577         uvc_status_cleanup(dev);
1578         uvc_ctrl_cleanup_device(dev);
1579
1580         list_for_each_safe(p, n, &dev->entities) {
1581                 struct uvc_entity *entity;
1582                 entity = list_entry(p, struct uvc_entity, list);
1583                 kfree(entity);
1584         }
1585
1586         list_for_each_safe(p, n, &dev->streaming) {
1587                 struct uvc_streaming *streaming;
1588                 streaming = list_entry(p, struct uvc_streaming, list);
1589                 usb_driver_release_interface(&uvc_driver.driver,
1590                         streaming->intf);
1591                 usb_put_intf(streaming->intf);
1592                 kfree(streaming->format);
1593                 kfree(streaming->header.bmaControls);
1594                 kfree(streaming);
1595         }
1596
1597         kfree(dev);
1598 }
1599
1600 static int uvc_probe(struct usb_interface *intf,
1601                      const struct usb_device_id *id)
1602 {
1603         struct usb_device *udev = interface_to_usbdev(intf);
1604         struct uvc_device *dev;
1605         int ret;
1606
1607         if (id->idVendor && id->idProduct)
1608                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1609                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1610                                 id->idProduct);
1611         else
1612                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1613                                 udev->devpath);
1614
1615         /* Allocate memory for the device and initialize it */
1616         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1617                 return -ENOMEM;
1618
1619         INIT_LIST_HEAD(&dev->entities);
1620         INIT_LIST_HEAD(&dev->streaming);
1621         kref_init(&dev->kref);
1622
1623         dev->udev = usb_get_dev(udev);
1624         dev->intf = usb_get_intf(intf);
1625         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1626         dev->quirks = id->driver_info | uvc_quirks_param;
1627
1628         if (udev->product != NULL)
1629                 strncpy(dev->name, udev->product, sizeof dev->name);
1630         else
1631                 snprintf(dev->name, sizeof dev->name,
1632                         "UVC Camera (%04x:%04x)",
1633                         le16_to_cpu(udev->descriptor.idVendor),
1634                         le16_to_cpu(udev->descriptor.idProduct));
1635
1636         /* Parse the Video Class control descriptor */
1637         if (uvc_parse_control(dev) < 0) {
1638                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1639                         "descriptors.\n");
1640                 goto error;
1641         }
1642
1643         uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1644                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1645                 udev->product ? udev->product : "<unnamed>",
1646                 le16_to_cpu(udev->descriptor.idVendor),
1647                 le16_to_cpu(udev->descriptor.idProduct));
1648
1649         if (uvc_quirks_param != 0) {
1650                 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1651                         "parameter for testing purpose.\n", uvc_quirks_param);
1652                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1653                         "linux-uvc-devel mailing list.\n");
1654         }
1655
1656         /* Initialize controls */
1657         if (uvc_ctrl_init_device(dev) < 0)
1658                 goto error;
1659
1660         /* Register the video devices */
1661         if (uvc_register_video(dev) < 0)
1662                 goto error;
1663
1664         /* Save our data pointer in the interface data */
1665         usb_set_intfdata(intf, dev);
1666
1667         /* Initialize the interrupt URB */
1668         if ((ret = uvc_status_init(dev)) < 0) {
1669                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1670                         "endpoint (%d), status interrupt will not be "
1671                         "supported.\n", ret);
1672         }
1673
1674         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1675         return 0;
1676
1677 error:
1678         kref_put(&dev->kref, uvc_delete);
1679         return -ENODEV;
1680 }
1681
1682 static void uvc_disconnect(struct usb_interface *intf)
1683 {
1684         struct uvc_device *dev = usb_get_intfdata(intf);
1685
1686         /* Set the USB interface data to NULL. This can be done outside the
1687          * lock, as there's no other reader.
1688          */
1689         usb_set_intfdata(intf, NULL);
1690
1691         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1692                 return;
1693
1694         /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1695          * lock is needed to prevent uvc_disconnect from releasing its
1696          * reference to the uvc_device instance after uvc_v4l2_open() received
1697          * the pointer to the device (video_devdata) but before it got the
1698          * chance to increase the reference count (kref_get).
1699          *
1700          * Note that the reference can't be released with the lock held,
1701          * otherwise a AB-BA deadlock can occur with videodev_lock that
1702          * videodev acquires in videodev_open() and video_unregister_device().
1703          */
1704         mutex_lock(&uvc_driver.open_mutex);
1705         dev->state |= UVC_DEV_DISCONNECTED;
1706         mutex_unlock(&uvc_driver.open_mutex);
1707
1708         kref_put(&dev->kref, uvc_delete);
1709 }
1710
1711 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1712 {
1713         struct uvc_device *dev = usb_get_intfdata(intf);
1714
1715         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1716                 intf->cur_altsetting->desc.bInterfaceNumber);
1717
1718         /* Controls are cached on the fly so they don't need to be saved. */
1719         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1720                 return uvc_status_suspend(dev);
1721
1722         if (dev->video.streaming->intf != intf) {
1723                 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1724                                 "interface mismatch.\n");
1725                 return -EINVAL;
1726         }
1727
1728         return uvc_video_suspend(&dev->video);
1729 }
1730
1731 static int __uvc_resume(struct usb_interface *intf, int reset)
1732 {
1733         struct uvc_device *dev = usb_get_intfdata(intf);
1734         int ret;
1735
1736         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1737                 intf->cur_altsetting->desc.bInterfaceNumber);
1738
1739         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1740                 if (reset && (ret = uvc_ctrl_resume_device(dev)) < 0)
1741                         return ret;
1742
1743                 return uvc_status_resume(dev);
1744         }
1745
1746         if (dev->video.streaming->intf != intf) {
1747                 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1748                                 "interface mismatch.\n");
1749                 return -EINVAL;
1750         }
1751
1752         return uvc_video_resume(&dev->video);
1753 }
1754
1755 static int uvc_resume(struct usb_interface *intf)
1756 {
1757         return __uvc_resume(intf, 0);
1758 }
1759
1760 static int uvc_reset_resume(struct usb_interface *intf)
1761 {
1762         return __uvc_resume(intf, 1);
1763 }
1764
1765 /* ------------------------------------------------------------------------
1766  * Driver initialization and cleanup
1767  */
1768
1769 /*
1770  * The Logitech cameras listed below have their interface class set to
1771  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1772  * though they are compliant.
1773  */
1774 static struct usb_device_id uvc_ids[] = {
1775         /* Microsoft Lifecam NX-6000 */
1776         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1777                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1778           .idVendor             = 0x045e,
1779           .idProduct            = 0x00f8,
1780           .bInterfaceClass      = USB_CLASS_VIDEO,
1781           .bInterfaceSubClass   = 1,
1782           .bInterfaceProtocol   = 0,
1783           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1784         /* Microsoft Lifecam VX-7000 */
1785         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1786                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1787           .idVendor             = 0x045e,
1788           .idProduct            = 0x0723,
1789           .bInterfaceClass      = USB_CLASS_VIDEO,
1790           .bInterfaceSubClass   = 1,
1791           .bInterfaceProtocol   = 0,
1792           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1793         /* Logitech Quickcam Fusion */
1794         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1795                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1796           .idVendor             = 0x046d,
1797           .idProduct            = 0x08c1,
1798           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1799           .bInterfaceSubClass   = 1,
1800           .bInterfaceProtocol   = 0 },
1801         /* Logitech Quickcam Orbit MP */
1802         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1803                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1804           .idVendor             = 0x046d,
1805           .idProduct            = 0x08c2,
1806           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1807           .bInterfaceSubClass   = 1,
1808           .bInterfaceProtocol   = 0 },
1809         /* Logitech Quickcam Pro for Notebook */
1810         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1811                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1812           .idVendor             = 0x046d,
1813           .idProduct            = 0x08c3,
1814           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1815           .bInterfaceSubClass   = 1,
1816           .bInterfaceProtocol   = 0 },
1817         /* Logitech Quickcam Pro 5000 */
1818         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1819                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1820           .idVendor             = 0x046d,
1821           .idProduct            = 0x08c5,
1822           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1823           .bInterfaceSubClass   = 1,
1824           .bInterfaceProtocol   = 0 },
1825         /* Logitech Quickcam OEM Dell Notebook */
1826         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1827                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1828           .idVendor             = 0x046d,
1829           .idProduct            = 0x08c6,
1830           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1831           .bInterfaceSubClass   = 1,
1832           .bInterfaceProtocol   = 0 },
1833         /* Logitech Quickcam OEM Cisco VT Camera II */
1834         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1835                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1836           .idVendor             = 0x046d,
1837           .idProduct            = 0x08c7,
1838           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1839           .bInterfaceSubClass   = 1,
1840           .bInterfaceProtocol   = 0 },
1841         /* Apple Built-In iSight */
1842         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1843                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1844           .idVendor             = 0x05ac,
1845           .idProduct            = 0x8501,
1846           .bInterfaceClass      = USB_CLASS_VIDEO,
1847           .bInterfaceSubClass   = 1,
1848           .bInterfaceProtocol   = 0,
1849           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1850                                 | UVC_QUIRK_BUILTIN_ISIGHT },
1851         /* Genesys Logic USB 2.0 PC Camera */
1852         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1853                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1854           .idVendor             = 0x05e3,
1855           .idProduct            = 0x0505,
1856           .bInterfaceClass      = USB_CLASS_VIDEO,
1857           .bInterfaceSubClass   = 1,
1858           .bInterfaceProtocol   = 0,
1859           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1860         /* MT6227 */
1861         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1862                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1863           .idVendor             = 0x0e8d,
1864           .idProduct            = 0x0004,
1865           .bInterfaceClass      = USB_CLASS_VIDEO,
1866           .bInterfaceSubClass   = 1,
1867           .bInterfaceProtocol   = 0,
1868           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1869         /* Syntek (HP Spartan) */
1870         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1871                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1872           .idVendor             = 0x174f,
1873           .idProduct            = 0x5212,
1874           .bInterfaceClass      = USB_CLASS_VIDEO,
1875           .bInterfaceSubClass   = 1,
1876           .bInterfaceProtocol   = 0,
1877           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1878         /* Syntek (Samsung Q310) */
1879         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1880                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1881           .idVendor             = 0x174f,
1882           .idProduct            = 0x5931,
1883           .bInterfaceClass      = USB_CLASS_VIDEO,
1884           .bInterfaceSubClass   = 1,
1885           .bInterfaceProtocol   = 0,
1886           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1887         /* Asus F9SG */
1888         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1889                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1890           .idVendor             = 0x174f,
1891           .idProduct            = 0x8a31,
1892           .bInterfaceClass      = USB_CLASS_VIDEO,
1893           .bInterfaceSubClass   = 1,
1894           .bInterfaceProtocol   = 0,
1895           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1896         /* Syntek (Asus U3S) */
1897         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1898                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1899           .idVendor             = 0x174f,
1900           .idProduct            = 0x8a33,
1901           .bInterfaceClass      = USB_CLASS_VIDEO,
1902           .bInterfaceSubClass   = 1,
1903           .bInterfaceProtocol   = 0,
1904           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1905         /* Lenovo Thinkpad SL500 */
1906         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1907                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1908           .idVendor             = 0x17ef,
1909           .idProduct            = 0x480b,
1910           .bInterfaceClass      = USB_CLASS_VIDEO,
1911           .bInterfaceSubClass   = 1,
1912           .bInterfaceProtocol   = 0,
1913           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1914         /* Ecamm Pico iMage */
1915         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1916                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1917           .idVendor             = 0x18cd,
1918           .idProduct            = 0xcafe,
1919           .bInterfaceClass      = USB_CLASS_VIDEO,
1920           .bInterfaceSubClass   = 1,
1921           .bInterfaceProtocol   = 0,
1922           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
1923         /* Bodelin ProScopeHR */
1924         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1925                                 | USB_DEVICE_ID_MATCH_DEV_HI
1926                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1927           .idVendor             = 0x19ab,
1928           .idProduct            = 0x1000,
1929           .bcdDevice_hi         = 0x0126,
1930           .bInterfaceClass      = USB_CLASS_VIDEO,
1931           .bInterfaceSubClass   = 1,
1932           .bInterfaceProtocol   = 0,
1933           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
1934         /* SiGma Micro USB Web Camera */
1935         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1936                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1937           .idVendor             = 0x1c4f,
1938           .idProduct            = 0x3000,
1939           .bInterfaceClass      = USB_CLASS_VIDEO,
1940           .bInterfaceSubClass   = 1,
1941           .bInterfaceProtocol   = 0,
1942           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1943                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT
1944                                 | UVC_QUIRK_PRUNE_CONTROLS },
1945         /* Generic USB Video Class */
1946         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1947         {}
1948 };
1949
1950 MODULE_DEVICE_TABLE(usb, uvc_ids);
1951
1952 struct uvc_driver uvc_driver = {
1953         .driver = {
1954                 .name           = "uvcvideo",
1955                 .probe          = uvc_probe,
1956                 .disconnect     = uvc_disconnect,
1957                 .suspend        = uvc_suspend,
1958                 .resume         = uvc_resume,
1959                 .reset_resume   = uvc_reset_resume,
1960                 .id_table       = uvc_ids,
1961                 .supports_autosuspend = 1,
1962         },
1963 };
1964
1965 static int __init uvc_init(void)
1966 {
1967         int result;
1968
1969         INIT_LIST_HEAD(&uvc_driver.devices);
1970         INIT_LIST_HEAD(&uvc_driver.controls);
1971         mutex_init(&uvc_driver.open_mutex);
1972         mutex_init(&uvc_driver.ctrl_mutex);
1973
1974         uvc_ctrl_init();
1975
1976         result = usb_register(&uvc_driver.driver);
1977         if (result == 0)
1978                 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
1979         return result;
1980 }
1981
1982 static void __exit uvc_cleanup(void)
1983 {
1984         usb_deregister(&uvc_driver.driver);
1985 }
1986
1987 module_init(uvc_init);
1988 module_exit(uvc_cleanup);
1989
1990 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
1991 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
1992 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
1993 MODULE_PARM_DESC(quirks, "Forced device quirks");
1994 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
1995 MODULE_PARM_DESC(trace, "Trace level bitmask");
1996
1997 MODULE_AUTHOR(DRIVER_AUTHOR);
1998 MODULE_DESCRIPTION(DRIVER_DESC);
1999 MODULE_LICENSE("GPL");
2000 MODULE_VERSION(DRIVER_VERSION);
2001