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 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 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         if (buffer[2] == VS_OUTPUT_HEADER) {
 613                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 614                         "%d OUTPUT HEADER descriptor is not supported.\n",
 615                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 616                 goto error;
 617         } else if (buffer[2] == VS_INPUT_HEADER) {
 618                 p = buflen >= 5 ? buffer[3] : 0;
 619                 n = buflen >= 12 ? buffer[12] : 0;
 620
 621                 if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
 622                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 623                                 "interface %d INPUT HEADER descriptor is "
 624                                 "invalid.\n", dev->udev->devnum,
 625                                 alts->desc.bInterfaceNumber);
 626                         goto error;
 627                 }
 628
 629                 streaming->header.bNumFormats = p;
 630                 streaming->header.bEndpointAddress = buffer[6];
 631                 streaming->header.bmInfo = buffer[7];
 632                 streaming->header.bTerminalLink = buffer[8];
 633                 streaming->header.bStillCaptureMethod = buffer[9];
 634                 streaming->header.bTriggerSupport = buffer[10];
 635                 streaming->header.bTriggerUsage = buffer[11];
 636                 streaming->header.bControlSize = n;
 637
 638                 streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
 639                 if (streaming->header.bmaControls == NULL) {
 640                         ret = -ENOMEM;
 641                         goto error;
 642                 }
 643
 644                 memcpy(streaming->header.bmaControls, &buffer[13], p*n);
 645         } else {
 646                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 647                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 648                         alts->desc.bInterfaceNumber);
 649                 goto error;
 650         }
 651
 652         buflen -= buffer[0];
 653         buffer += buffer[0];
 654
 655         _buffer = buffer;
 656         _buflen = buflen;
 657
 658         /* Count the format and frame descriptors. */
 659         while (_buflen > 2) {
 660                 switch (_buffer[2]) {
 661                 case VS_FORMAT_UNCOMPRESSED:
 662                 case VS_FORMAT_MJPEG:
 663                 case VS_FORMAT_FRAME_BASED:
 664                         nformats++;
 665                         break;
 666
 667                 case VS_FORMAT_DV:
 668                         /* DV format has no frame descriptor. We will create a
 669                          * dummy frame descriptor with a dummy frame interval.
 670                          */
 671                         nformats++;
 672                         nframes++;
 673                         nintervals++;
 674                         break;
 675
 676                 case VS_FORMAT_MPEG2TS:
 677                 case VS_FORMAT_STREAM_BASED:
 678                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 679                                 "interface %d FORMAT %u is not supported.\n",
 680                                 dev->udev->devnum,
 681                                 alts->desc.bInterfaceNumber, _buffer[2]);
 682                         break;
 683
 684                 case VS_FRAME_UNCOMPRESSED:
 685                 case VS_FRAME_MJPEG:
 686                         nframes++;
 687                         if (_buflen > 25)
 688                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 689                         break;
 690
 691                 case VS_FRAME_FRAME_BASED:
 692                         nframes++;
 693                         if (_buflen > 21)
 694                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 695                         break;
 696                 }
 697
 698                 _buflen -= _buffer[0];
 699                 _buffer += _buffer[0];
 700         }
 701
 702         if (nformats == 0) {
 703                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 704                         "%d has no supported formats defined.\n",
 705                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 706                 goto error;
 707         }
 708
 709         size = nformats * sizeof *format + nframes * sizeof *frame
 710              + nintervals * sizeof *interval;
 711         format = kzalloc(size, GFP_KERNEL);
 712         if (format == NULL) {
 713                 ret = -ENOMEM;
 714                 goto error;
 715         }
 716
 717         frame = (struct uvc_frame *)&format[nformats];
 718         interval = (__u32 *)&frame[nframes];
 719
 720         streaming->format = format;
 721         streaming->nformats = nformats;
 722
 723         /* Parse the format descriptors. */
 724         while (buflen > 2) {
 725                 switch (buffer[2]) {
 726                 case VS_FORMAT_UNCOMPRESSED:
 727                 case VS_FORMAT_MJPEG:
 728                 case VS_FORMAT_DV:
 729                 case VS_FORMAT_FRAME_BASED:
 730                         format->frame = frame;
 731                         ret = uvc_parse_format(dev, streaming, format,
 732                                 &interval, buffer, buflen);
 733                         if (ret < 0)
 734                                 goto error;
 735
 736                         frame += format->nframes;
 737                         format++;
 738
 739                         buflen -= ret;
 740                         buffer += ret;
 741                         continue;
 742
 743                 default:
 744                         break;
 745                 }
 746
 747                 buflen -= buffer[0];
 748                 buffer += buffer[0];
 749         }
 750
 751         /* Parse the alternate settings to find the maximum bandwidth. */
 752         for (i = 0; i < intf->num_altsetting; ++i) {
 753                 struct usb_host_endpoint *ep;
 754                 alts = &intf->altsetting[i];
 755                 ep = uvc_find_endpoint(alts,
 756                                 streaming->header.bEndpointAddress);
 757                 if (ep == NULL)
 758                         continue;
 759
 760                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 761                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 762                 if (psize > streaming->maxpsize)
 763                         streaming->maxpsize = psize;
 764         }
 765
 766         list_add_tail(&streaming->list, &dev->streaming);
 767         return 0;
 768
 769 error:
 770         usb_driver_release_interface(&uvc_driver.driver, intf);
 771         usb_put_intf(intf);
 772         kfree(streaming->format);
 773         kfree(streaming->header.bmaControls);
 774         kfree(streaming);
 775         return ret;
 776 }
 777
 778 /* Parse vendor-specific extensions. */
 779 static int uvc_parse_vendor_control(struct uvc_device *dev,
 780         const unsigned char *buffer, int buflen)
 781 {
 782         struct usb_device *udev = dev->udev;
 783         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 784         struct uvc_entity *unit;
 785         unsigned int n, p;
 786         int handled = 0;
 787
 788         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 789         case 0x046d:            /* Logitech */
 790                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 791                         break;
 792
 793                 /* Logitech implements several vendor specific functions
 794                  * through vendor specific extension units (LXU).
 795                  *
 796                  * The LXU descriptors are similar to XU descriptors
 797                  * (see "USB Device Video Class for Video Devices", section
 798                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 799                  * differences:
 800                  *
 801                  * ----------------------------------------------------------
 802                  * 0            bLength         1        Number
 803                  *      Size of this descriptor, in bytes: 24+p+n*2
 804                  * ----------------------------------------------------------
 805                  * 23+p+n       bmControlsType  N       Bitmap
 806                  *      Individual bits in the set are defined:
 807                  *      0: Absolute
 808                  *      1: Relative
 809                  *
 810                  *      This bitset is mapped exactly the same as bmControls.
 811                  * ----------------------------------------------------------
 812                  * 23+p+n*2     bReserved       1       Boolean
 813                  * ----------------------------------------------------------
 814                  * 24+p+n*2     iExtension      1       Index
 815                  *      Index of a string descriptor that describes this
 816                  *      extension unit.
 817                  * ----------------------------------------------------------
 818                  */
 819                 p = buflen >= 22 ? buffer[21] : 0;
 820                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 821
 822                 if (buflen < 25 + p + 2*n) {
 823                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 824                                 "interface %d EXTENSION_UNIT error\n",
 825                                 udev->devnum, alts->desc.bInterfaceNumber);
 826                         break;
 827                 }
 828
 829                 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
 830                 if (unit == NULL)
 831                         return -ENOMEM;
 832
 833                 unit->id = buffer[3];
 834                 unit->type = VC_EXTENSION_UNIT;
 835                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 836                 unit->extension.bNumControls = buffer[20];
 837                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
 838                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
 839                 memcpy(unit->extension.baSourceID, &buffer[22], p);
 840                 unit->extension.bControlSize = buffer[22+p];
 841                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
 842                 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
 843                                                + p + n;
 844                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 845
 846                 if (buffer[24+p+2*n] != 0)
 847                         usb_string(udev, buffer[24+p+2*n], unit->name,
 848                                    sizeof unit->name);
 849                 else
 850                         sprintf(unit->name, "Extension %u", buffer[3]);
 851
 852                 list_add_tail(&unit->list, &dev->entities);
 853                 handled = 1;
 854                 break;
 855         }
 856
 857         return handled;
 858 }
 859
 860 static int uvc_parse_standard_control(struct uvc_device *dev,
 861         const unsigned char *buffer, int buflen)
 862 {
 863         struct usb_device *udev = dev->udev;
 864         struct uvc_entity *unit, *term;
 865         struct usb_interface *intf;
 866         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 867         unsigned int i, n, p, len;
 868         __u16 type;
 869
 870         switch (buffer[2]) {
 871         case VC_HEADER:
 872                 n = buflen >= 12 ? buffer[11] : 0;
 873
 874                 if (buflen < 12 || buflen < 12 + n) {
 875                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 876                                 "interface %d HEADER error\n", udev->devnum,
 877                                 alts->desc.bInterfaceNumber);
 878                         return -EINVAL;
 879                 }
 880
 881                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 882                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 883
 884                 /* Parse all USB Video Streaming interfaces. */
 885                 for (i = 0; i < n; ++i) {
 886                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 887                         if (intf == NULL) {
 888                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 889                                         "interface %d doesn't exists\n",
 890                                         udev->devnum, i);
 891                                 continue;
 892                         }
 893
 894                         uvc_parse_streaming(dev, intf);
 895                 }
 896                 break;
 897
 898         case VC_INPUT_TERMINAL:
 899                 if (buflen < 8) {
 900                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 901                                 "interface %d INPUT_TERMINAL error\n",
 902                                 udev->devnum, alts->desc.bInterfaceNumber);
 903                         return -EINVAL;
 904                 }
 905
 906                 /* Make sure the terminal type MSB is not null, otherwise it
 907                  * could be confused with a unit.
 908                  */
 909                 type = get_unaligned_le16(&buffer[4]);
 910                 if ((type & 0xff00) == 0) {
 911                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 912                                 "interface %d INPUT_TERMINAL %d has invalid "
 913                                 "type 0x%04x, skipping\n", udev->devnum,
 914                                 alts->desc.bInterfaceNumber,
 915                                 buffer[3], type);
 916                         return 0;
 917                 }
 918
 919                 n = 0;
 920                 p = 0;
 921                 len = 8;
 922
 923                 if (type == ITT_CAMERA) {
 924                         n = buflen >= 15 ? buffer[14] : 0;
 925                         len = 15;
 926
 927                 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
 928                         n = buflen >= 9 ? buffer[8] : 0;
 929                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 930                         len = 10;
 931                 }
 932
 933                 if (buflen < len + n + p) {
 934                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 935                                 "interface %d INPUT_TERMINAL error\n",
 936                                 udev->devnum, alts->desc.bInterfaceNumber);
 937                         return -EINVAL;
 938                 }
 939
 940                 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
 941                 if (term == NULL)
 942                         return -ENOMEM;
 943
 944                 term->id = buffer[3];
 945                 term->type = type | UVC_TERM_INPUT;
 946
 947                 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
 948                         term->camera.bControlSize = n;
 949                         term->camera.bmControls = (__u8 *)term + sizeof *term;
 950                         term->camera.wObjectiveFocalLengthMin =
 951                                 get_unaligned_le16(&buffer[8]);
 952                         term->camera.wObjectiveFocalLengthMax =
 953                                 get_unaligned_le16(&buffer[10]);
 954                         term->camera.wOcularFocalLength =
 955                                 get_unaligned_le16(&buffer[12]);
 956                         memcpy(term->camera.bmControls, &buffer[15], n);
 957                 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
 958                         term->media.bControlSize = n;
 959                         term->media.bmControls = (__u8 *)term + sizeof *term;
 960                         term->media.bTransportModeSize = p;
 961                         term->media.bmTransportModes = (__u8 *)term
 962                                                      + sizeof *term + n;
 963                         memcpy(term->media.bmControls, &buffer[9], n);
 964                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
 965                 }
 966
 967                 if (buffer[7] != 0)
 968                         usb_string(udev, buffer[7], term->name,
 969                                    sizeof term->name);
 970                 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
 971                         sprintf(term->name, "Camera %u", buffer[3]);
 972                 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
 973                         sprintf(term->name, "Media %u", buffer[3]);
 974                 else
 975                         sprintf(term->name, "Input %u", buffer[3]);
 976
 977                 list_add_tail(&term->list, &dev->entities);
 978                 break;
 979
 980         case VC_OUTPUT_TERMINAL:
 981                 if (buflen < 9) {
 982                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 983                                 "interface %d OUTPUT_TERMINAL error\n",
 984                                 udev->devnum, alts->desc.bInterfaceNumber);
 985                         return -EINVAL;
 986                 }
 987
 988                 /* Make sure the terminal type MSB is not null, otherwise it
 989                  * could be confused with a unit.
 990                  */
 991                 type = get_unaligned_le16(&buffer[4]);
 992                 if ((type & 0xff00) == 0) {
 993                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 994                                 "interface %d OUTPUT_TERMINAL %d has invalid "
 995                                 "type 0x%04x, skipping\n", udev->devnum,
 996                                 alts->desc.bInterfaceNumber, buffer[3], type);
 997                         return 0;
 998                 }
 999
1000                 term = kzalloc(sizeof *term, GFP_KERNEL);
1001                 if (term == NULL)
1002                         return -ENOMEM;
1003
1004                 term->id = buffer[3];
1005                 term->type = type | UVC_TERM_OUTPUT;
1006                 term->output.bSourceID = buffer[7];
1007
1008                 if (buffer[8] != 0)
1009                         usb_string(udev, buffer[8], term->name,
1010                                    sizeof term->name);
1011                 else
1012                         sprintf(term->name, "Output %u", buffer[3]);
1013
1014                 list_add_tail(&term->list, &dev->entities);
1015                 break;
1016
1017         case VC_SELECTOR_UNIT:
1018                 p = buflen >= 5 ? buffer[4] : 0;
1019
1020                 if (buflen < 5 || buflen < 6 + p) {
1021                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1022                                 "interface %d SELECTOR_UNIT error\n",
1023                                 udev->devnum, alts->desc.bInterfaceNumber);
1024                         return -EINVAL;
1025                 }
1026
1027                 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1028                 if (unit == NULL)
1029                         return -ENOMEM;
1030
1031                 unit->id = buffer[3];
1032                 unit->type = buffer[2];
1033                 unit->selector.bNrInPins = buffer[4];
1034                 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1035                 memcpy(unit->selector.baSourceID, &buffer[5], p);
1036
1037                 if (buffer[5+p] != 0)
1038                         usb_string(udev, buffer[5+p], unit->name,
1039                                    sizeof unit->name);
1040                 else
1041                         sprintf(unit->name, "Selector %u", buffer[3]);
1042
1043                 list_add_tail(&unit->list, &dev->entities);
1044                 break;
1045
1046         case VC_PROCESSING_UNIT:
1047                 n = buflen >= 8 ? buffer[7] : 0;
1048                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1049
1050                 if (buflen < p + n) {
1051                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1052                                 "interface %d PROCESSING_UNIT error\n",
1053                                 udev->devnum, alts->desc.bInterfaceNumber);
1054                         return -EINVAL;
1055                 }
1056
1057                 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1058                 if (unit == NULL)
1059                         return -ENOMEM;
1060
1061                 unit->id = buffer[3];
1062                 unit->type = buffer[2];
1063                 unit->processing.bSourceID = buffer[4];
1064                 unit->processing.wMaxMultiplier =
1065                         get_unaligned_le16(&buffer[5]);
1066                 unit->processing.bControlSize = buffer[7];
1067                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1068                 memcpy(unit->processing.bmControls, &buffer[8], n);
1069                 if (dev->uvc_version >= 0x0110)
1070                         unit->processing.bmVideoStandards = buffer[9+n];
1071
1072                 if (buffer[8+n] != 0)
1073                         usb_string(udev, buffer[8+n], unit->name,
1074                                    sizeof unit->name);
1075                 else
1076                         sprintf(unit->name, "Processing %u", buffer[3]);
1077
1078                 list_add_tail(&unit->list, &dev->entities);
1079                 break;
1080
1081         case VC_EXTENSION_UNIT:
1082                 p = buflen >= 22 ? buffer[21] : 0;
1083                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1084
1085                 if (buflen < 24 + p + n) {
1086                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1087                                 "interface %d EXTENSION_UNIT error\n",
1088                                 udev->devnum, alts->desc.bInterfaceNumber);
1089                         return -EINVAL;
1090                 }
1091
1092                 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1093                 if (unit == NULL)
1094                         return -ENOMEM;
1095
1096                 unit->id = buffer[3];
1097                 unit->type = buffer[2];
1098                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1099                 unit->extension.bNumControls = buffer[20];
1100                 unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
1101                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1102                 memcpy(unit->extension.baSourceID, &buffer[22], p);
1103                 unit->extension.bControlSize = buffer[22+p];
1104                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1105                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1106
1107                 if (buffer[23+p+n] != 0)
1108                         usb_string(udev, buffer[23+p+n], unit->name,
1109                                    sizeof unit->name);
1110                 else
1111                         sprintf(unit->name, "Extension %u", buffer[3]);
1112
1113                 list_add_tail(&unit->list, &dev->entities);
1114                 break;
1115
1116         default:
1117                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1118                         "descriptor (%u)\n", buffer[2]);
1119                 break;
1120         }
1121
1122         return 0;
1123 }
1124
1125 static int uvc_parse_control(struct uvc_device *dev)
1126 {
1127         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1128         unsigned char *buffer = alts->extra;
1129         int buflen = alts->extralen;
1130         int ret;
1131
1132         /* Parse the default alternate setting only, as the UVC specification
1133          * defines a single alternate setting, the default alternate setting
1134          * zero.
1135          */
1136
1137         while (buflen > 2) {
1138                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1139                     buffer[1] != USB_DT_CS_INTERFACE)
1140                         goto next_descriptor;
1141
1142                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1143                         return ret;
1144
1145 next_descriptor:
1146                 buflen -= buffer[0];
1147                 buffer += buffer[0];
1148         }
1149
1150         /* Check if the optional status endpoint is present. */
1151         if (alts->desc.bNumEndpoints == 1) {
1152                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1153                 struct usb_endpoint_descriptor *desc = &ep->desc;
1154
1155                 if (usb_endpoint_is_int_in(desc) &&
1156                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1157                     desc->bInterval != 0) {
1158                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1159                                 "(addr %02x).\n", desc->bEndpointAddress);
1160                         dev->int_ep = ep;
1161                 }
1162         }
1163
1164         return 0;
1165 }
1166
1167 /* ------------------------------------------------------------------------
1168  * USB probe and disconnect
1169  */
1170
1171 /*
1172  * Unregister the video devices.
1173  */
1174 static void uvc_unregister_video(struct uvc_device *dev)
1175 {
1176         if (dev->video.vdev) {
1177                 if (dev->video.vdev->minor == -1)
1178                         video_device_release(dev->video.vdev);
1179                 else
1180                         video_unregister_device(dev->video.vdev);
1181                 dev->video.vdev = NULL;
1182         }
1183 }
1184
1185 /*
1186  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1187  * and containing the following units:
1188  *
1189  * - a USB Streaming Output Terminal
1190  * - zero or one Processing Unit
1191  * - zero, one or mode single-input Selector Units
1192  * - zero or one multiple-input Selector Units, provided all inputs are
1193  *   connected to input terminals
1194  * - zero, one or mode single-input Extension Units
1195  * - one Camera Input Terminal, or one or more External terminals.
1196  *
1197  * A side forward scan is made on each detected entity to check for additional
1198  * extension units.
1199  */
1200 static int uvc_scan_chain_entity(struct uvc_video_device *video,
1201         struct uvc_entity *entity)
1202 {
1203         switch (UVC_ENTITY_TYPE(entity)) {
1204         case VC_EXTENSION_UNIT:
1205                 if (uvc_trace_param & UVC_TRACE_PROBE)
1206                         printk(" <- XU %d", entity->id);
1207
1208                 if (entity->extension.bNrInPins != 1) {
1209                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1210                                 "than 1 input pin.\n", entity->id);
1211                         return -1;
1212                 }
1213
1214                 list_add_tail(&entity->chain, &video->extensions);
1215                 break;
1216
1217         case VC_PROCESSING_UNIT:
1218                 if (uvc_trace_param & UVC_TRACE_PROBE)
1219                         printk(" <- PU %d", entity->id);
1220
1221                 if (video->processing != NULL) {
1222                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1223                                 "Processing Units in chain.\n");
1224                         return -1;
1225                 }
1226
1227                 video->processing = entity;
1228                 break;
1229
1230         case VC_SELECTOR_UNIT:
1231                 if (uvc_trace_param & UVC_TRACE_PROBE)
1232                         printk(" <- SU %d", entity->id);
1233
1234                 /* Single-input selector units are ignored. */
1235                 if (entity->selector.bNrInPins == 1)
1236                         break;
1237
1238                 if (video->selector != NULL) {
1239                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1240                                 "Units in chain.\n");
1241                         return -1;
1242                 }
1243
1244                 video->selector = entity;
1245                 break;
1246
1247         case ITT_VENDOR_SPECIFIC:
1248         case ITT_CAMERA:
1249         case ITT_MEDIA_TRANSPORT_INPUT:
1250                 if (uvc_trace_param & UVC_TRACE_PROBE)
1251                         printk(" <- IT %d\n", entity->id);
1252
1253                 list_add_tail(&entity->chain, &video->iterms);
1254                 break;
1255
1256         default:
1257                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1258                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1259                 return -1;
1260         }
1261
1262         return 0;
1263 }
1264
1265 static int uvc_scan_chain_forward(struct uvc_video_device *video,
1266         struct uvc_entity *entity, struct uvc_entity *prev)
1267 {
1268         struct uvc_entity *forward;
1269         int found;
1270
1271         /* Forward scan */
1272         forward = NULL;
1273         found = 0;
1274
1275         while (1) {
1276                 forward = uvc_entity_by_reference(video->dev, entity->id,
1277                         forward);
1278                 if (forward == NULL)
1279                         break;
1280
1281                 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1282                     forward == prev)
1283                         continue;
1284
1285                 if (forward->extension.bNrInPins != 1) {
1286                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1287                                 "more than 1 input pin.\n", entity->id);
1288                         return -1;
1289                 }
1290
1291                 list_add_tail(&forward->chain, &video->extensions);
1292                 if (uvc_trace_param & UVC_TRACE_PROBE) {
1293                         if (!found)
1294                                 printk(" (-> XU");
1295
1296                         printk(" %d", forward->id);
1297                         found = 1;
1298                 }
1299         }
1300         if (found)
1301                 printk(")");
1302
1303         return 0;
1304 }
1305
1306 static int uvc_scan_chain_backward(struct uvc_video_device *video,
1307         struct uvc_entity *entity)
1308 {
1309         struct uvc_entity *term;
1310         int id = -1, i;
1311
1312         switch (UVC_ENTITY_TYPE(entity)) {
1313         case VC_EXTENSION_UNIT:
1314                 id = entity->extension.baSourceID[0];
1315                 break;
1316
1317         case VC_PROCESSING_UNIT:
1318                 id = entity->processing.bSourceID;
1319                 break;
1320
1321         case VC_SELECTOR_UNIT:
1322                 /* Single-input selector units are ignored. */
1323                 if (entity->selector.bNrInPins == 1) {
1324                         id = entity->selector.baSourceID[0];
1325                         break;
1326                 }
1327
1328                 if (uvc_trace_param & UVC_TRACE_PROBE)
1329                         printk(" <- IT");
1330
1331                 video->selector = entity;
1332                 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1333                         id = entity->selector.baSourceID[i];
1334                         term = uvc_entity_by_id(video->dev, id);
1335                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1336                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1337                                         "input %d isn't connected to an "
1338                                         "input terminal\n", entity->id, i);
1339                                 return -1;
1340                         }
1341
1342                         if (uvc_trace_param & UVC_TRACE_PROBE)
1343                                 printk(" %d", term->id);
1344
1345                         list_add_tail(&term->chain, &video->iterms);
1346                         uvc_scan_chain_forward(video, term, entity);
1347                 }
1348
1349                 if (uvc_trace_param & UVC_TRACE_PROBE)
1350                         printk("\n");
1351
1352                 id = 0;
1353                 break;
1354         }
1355
1356         return id;
1357 }
1358
1359 static int uvc_scan_chain(struct uvc_video_device *video)
1360 {
1361         struct uvc_entity *entity, *prev;
1362         int id;
1363
1364         entity = video->oterm;
1365         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1366         id = entity->output.bSourceID;
1367         while (id != 0) {
1368                 prev = entity;
1369                 entity = uvc_entity_by_id(video->dev, id);
1370                 if (entity == NULL) {
1371                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1372                                 "unknown entity %d.\n", id);
1373                         return -1;
1374                 }
1375
1376                 /* Process entity */
1377                 if (uvc_scan_chain_entity(video, entity) < 0)
1378                         return -1;
1379
1380                 /* Forward scan */
1381                 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1382                         return -1;
1383
1384                 /* Stop when a terminal is found. */
1385                 if (!UVC_ENTITY_IS_UNIT(entity))
1386                         break;
1387
1388                 /* Backward scan */
1389                 id = uvc_scan_chain_backward(video, entity);
1390                 if (id < 0)
1391                         return id;
1392         }
1393
1394         /* Initialize the video buffers queue. */
1395         uvc_queue_init(&video->queue);
1396
1397         return 0;
1398 }
1399
1400 /*
1401  * Register the video devices.
1402  *
1403  * The driver currently supports a single video device per control interface
1404  * only. The terminal and units must match the following structure:
1405  *
1406  * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1407  *
1408  * The Extension Units, if present, must have a single input pin. The
1409  * Processing Unit and Extension Units can be in any order. Additional
1410  * Extension Units connected to the main chain as single-unit branches are
1411  * also supported.
1412  */
1413 static int uvc_register_video(struct uvc_device *dev)
1414 {
1415         struct video_device *vdev;
1416         struct uvc_entity *term;
1417         int found = 0, ret;
1418
1419         /* Check if the control interface matches the structure we expect. */
1420         list_for_each_entry(term, &dev->entities, list) {
1421                 struct uvc_streaming *streaming;
1422
1423                 if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
1424                         continue;
1425
1426                 memset(&dev->video, 0, sizeof dev->video);
1427                 mutex_init(&dev->video.ctrl_mutex);
1428                 INIT_LIST_HEAD(&dev->video.iterms);
1429                 INIT_LIST_HEAD(&dev->video.extensions);
1430                 dev->video.oterm = term;
1431                 dev->video.dev = dev;
1432                 if (uvc_scan_chain(&dev->video) < 0)
1433                         continue;
1434
1435                 list_for_each_entry(streaming, &dev->streaming, list) {
1436                         if (streaming->header.bTerminalLink == term->id) {
1437                                 dev->video.streaming = streaming;
1438                                 found = 1;
1439                                 break;
1440                         }
1441                 }
1442
1443                 if (found)
1444                         break;
1445         }
1446
1447         if (!found) {
1448                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1449                 return -1;
1450         }
1451
1452         if (uvc_trace_param & UVC_TRACE_PROBE) {
1453                 uvc_printk(KERN_INFO, "Found a valid video chain (");
1454                 list_for_each_entry(term, &dev->video.iterms, chain) {
1455                         printk("%d", term->id);
1456                         if (term->chain.next != &dev->video.iterms)
1457                                 printk(",");
1458                 }
1459                 printk(" -> %d).\n", dev->video.oterm->id);
1460         }
1461
1462         /* Initialize the streaming interface with default streaming
1463          * parameters.
1464          */
1465         if ((ret = uvc_video_init(&dev->video)) < 0) {
1466                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1467                         "(%d).\n", ret);
1468                 return ret;
1469         }
1470
1471         /* Register the device with V4L. */
1472         vdev = video_device_alloc();
1473         if (vdev == NULL)
1474                 return -1;
1475
1476         /* We already hold a reference to dev->udev. The video device will be
1477          * unregistered before the reference is released, so we don't need to
1478          * get another one.
1479          */
1480         vdev->parent = &dev->intf->dev;
1481         vdev->minor = -1;
1482         vdev->fops = &uvc_fops;
1483         vdev->release = video_device_release;
1484         strncpy(vdev->name, dev->name, sizeof vdev->name);
1485
1486         /* Set the driver data before calling video_register_device, otherwise
1487          * uvc_v4l2_open might race us.
1488          *
1489          * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1490          *        problem ? Does any function which could be called here get
1491          *        a pointer to the usb_interface ?
1492          */
1493         dev->video.vdev = vdev;
1494         video_set_drvdata(vdev, &dev->video);
1495
1496         if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1497                 dev->video.vdev = NULL;
1498                 video_device_release(vdev);
1499                 return -1;
1500         }
1501
1502         return 0;
1503 }
1504
1505 /*
1506  * Delete the UVC device.
1507  *
1508  * Called by the kernel when the last reference to the uvc_device structure
1509  * is released.
1510  *
1511  * Unregistering the video devices is done here because every opened instance
1512  * must be closed before the device can be unregistered. An alternative would
1513  * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1514  * unregister the video devices on disconnect when that reference count drops
1515  * to zero.
1516  *
1517  * As this function is called after or during disconnect(), all URBs have
1518  * already been canceled by the USB core. There is no need to kill the
1519  * interrupt URB manually.
1520  */
1521 void uvc_delete(struct kref *kref)
1522 {
1523         struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1524         struct list_head *p, *n;
1525
1526         /* Unregister the video device */
1527         uvc_unregister_video(dev);
1528         usb_put_intf(dev->intf);
1529         usb_put_dev(dev->udev);
1530
1531         uvc_status_cleanup(dev);
1532         uvc_ctrl_cleanup_device(dev);
1533
1534         list_for_each_safe(p, n, &dev->entities) {
1535                 struct uvc_entity *entity;
1536                 entity = list_entry(p, struct uvc_entity, list);
1537                 kfree(entity);
1538         }
1539
1540         list_for_each_safe(p, n, &dev->streaming) {
1541                 struct uvc_streaming *streaming;
1542                 streaming = list_entry(p, struct uvc_streaming, list);
1543                 usb_driver_release_interface(&uvc_driver.driver,
1544                         streaming->intf);
1545                 usb_put_intf(streaming->intf);
1546                 kfree(streaming->format);
1547                 kfree(streaming->header.bmaControls);
1548                 kfree(streaming);
1549         }
1550
1551         kfree(dev);
1552 }
1553
1554 static int uvc_probe(struct usb_interface *intf,
1555                      const struct usb_device_id *id)
1556 {
1557         struct usb_device *udev = interface_to_usbdev(intf);
1558         struct uvc_device *dev;
1559         int ret;
1560
1561         if (id->idVendor && id->idProduct)
1562                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1563                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1564                                 id->idProduct);
1565         else
1566                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1567                                 udev->devpath);
1568
1569         /* Allocate memory for the device and initialize it */
1570         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1571                 return -ENOMEM;
1572
1573         INIT_LIST_HEAD(&dev->entities);
1574         INIT_LIST_HEAD(&dev->streaming);
1575         kref_init(&dev->kref);
1576
1577         dev->udev = usb_get_dev(udev);
1578         dev->intf = usb_get_intf(intf);
1579         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1580         dev->quirks = id->driver_info | uvc_quirks_param;
1581
1582         if (udev->product != NULL)
1583                 strncpy(dev->name, udev->product, sizeof dev->name);
1584         else
1585                 snprintf(dev->name, sizeof dev->name,
1586                         "UVC Camera (%04x:%04x)",
1587                         le16_to_cpu(udev->descriptor.idVendor),
1588                         le16_to_cpu(udev->descriptor.idProduct));
1589
1590         /* Parse the Video Class control descriptor */
1591         if (uvc_parse_control(dev) < 0) {
1592                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1593                         "descriptors.\n");
1594                 goto error;
1595         }
1596
1597         uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1598                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1599                 udev->product ? udev->product : "<unnamed>",
1600                 le16_to_cpu(udev->descriptor.idVendor),
1601                 le16_to_cpu(udev->descriptor.idProduct));
1602
1603         if (uvc_quirks_param != 0) {
1604                 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1605                         "parameter for testing purpose.\n", uvc_quirks_param);
1606                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1607                         "linux-uvc-devel mailing list.\n");
1608         }
1609
1610         /* Initialize controls */
1611         if (uvc_ctrl_init_device(dev) < 0)
1612                 goto error;
1613
1614         /* Register the video devices */
1615         if (uvc_register_video(dev) < 0)
1616                 goto error;
1617
1618         /* Save our data pointer in the interface data */
1619         usb_set_intfdata(intf, dev);
1620
1621         /* Initialize the interrupt URB */
1622         if ((ret = uvc_status_init(dev)) < 0) {
1623                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1624                         "endpoint (%d), status interrupt will not be "
1625                         "supported.\n", ret);
1626         }
1627
1628         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1629         return 0;
1630
1631 error:
1632         kref_put(&dev->kref, uvc_delete);
1633         return -ENODEV;
1634 }
1635
1636 static void uvc_disconnect(struct usb_interface *intf)
1637 {
1638         struct uvc_device *dev = usb_get_intfdata(intf);
1639
1640         /* Set the USB interface data to NULL. This can be done outside the
1641          * lock, as there's no other reader.
1642          */
1643         usb_set_intfdata(intf, NULL);
1644
1645         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1646                 return;
1647
1648         /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1649          * lock is needed to prevent uvc_disconnect from releasing its
1650          * reference to the uvc_device instance after uvc_v4l2_open() received
1651          * the pointer to the device (video_devdata) but before it got the
1652          * chance to increase the reference count (kref_get).
1653          *
1654          * Note that the reference can't be released with the lock held,
1655          * otherwise a AB-BA deadlock can occur with videodev_lock that
1656          * videodev acquires in videodev_open() and video_unregister_device().
1657          */
1658         mutex_lock(&uvc_driver.open_mutex);
1659         dev->state |= UVC_DEV_DISCONNECTED;
1660         mutex_unlock(&uvc_driver.open_mutex);
1661
1662         kref_put(&dev->kref, uvc_delete);
1663 }
1664
1665 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1666 {
1667         struct uvc_device *dev = usb_get_intfdata(intf);
1668
1669         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1670                 intf->cur_altsetting->desc.bInterfaceNumber);
1671
1672         /* Controls are cached on the fly so they don't need to be saved. */
1673         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1674                 return uvc_status_suspend(dev);
1675
1676         if (dev->video.streaming->intf != intf) {
1677                 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1678                                 "interface mismatch.\n");
1679                 return -EINVAL;
1680         }
1681
1682         return uvc_video_suspend(&dev->video);
1683 }
1684
1685 static int __uvc_resume(struct usb_interface *intf, int reset)
1686 {
1687         struct uvc_device *dev = usb_get_intfdata(intf);
1688         int ret;
1689
1690         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1691                 intf->cur_altsetting->desc.bInterfaceNumber);
1692
1693         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1694                 if (reset && (ret = uvc_ctrl_resume_device(dev)) < 0)
1695                         return ret;
1696
1697                 return uvc_status_resume(dev);
1698         }
1699
1700         if (dev->video.streaming->intf != intf) {
1701                 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1702                                 "interface mismatch.\n");
1703                 return -EINVAL;
1704         }
1705
1706         return uvc_video_resume(&dev->video);
1707 }
1708
1709 static int uvc_resume(struct usb_interface *intf)
1710 {
1711         return __uvc_resume(intf, 0);
1712 }
1713
1714 static int uvc_reset_resume(struct usb_interface *intf)
1715 {
1716         return __uvc_resume(intf, 1);
1717 }
1718
1719 /* ------------------------------------------------------------------------
1720  * Driver initialization and cleanup
1721  */
1722
1723 /*
1724  * The Logitech cameras listed below have their interface class set to
1725  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1726  * though they are compliant.
1727  */
1728 static struct usb_device_id uvc_ids[] = {
1729         /* Microsoft Lifecam NX-6000 */
1730         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1731                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1732           .idVendor             = 0x045e,
1733           .idProduct            = 0x00f8,
1734           .bInterfaceClass      = USB_CLASS_VIDEO,
1735           .bInterfaceSubClass   = 1,
1736           .bInterfaceProtocol   = 0,
1737           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1738         /* Microsoft Lifecam VX-7000 */
1739         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1740                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1741           .idVendor             = 0x045e,
1742           .idProduct            = 0x0723,
1743           .bInterfaceClass      = USB_CLASS_VIDEO,
1744           .bInterfaceSubClass   = 1,
1745           .bInterfaceProtocol   = 0,
1746           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1747         /* Logitech Quickcam Fusion */
1748         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1749                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1750           .idVendor             = 0x046d,
1751           .idProduct            = 0x08c1,
1752           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1753           .bInterfaceSubClass   = 1,
1754           .bInterfaceProtocol   = 0 },
1755         /* Logitech Quickcam Orbit MP */
1756         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1757                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1758           .idVendor             = 0x046d,
1759           .idProduct            = 0x08c2,
1760           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1761           .bInterfaceSubClass   = 1,
1762           .bInterfaceProtocol   = 0 },
1763         /* Logitech Quickcam Pro for Notebook */
1764         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1765                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1766           .idVendor             = 0x046d,
1767           .idProduct            = 0x08c3,
1768           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1769           .bInterfaceSubClass   = 1,
1770           .bInterfaceProtocol   = 0 },
1771         /* Logitech Quickcam Pro 5000 */
1772         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1773                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1774           .idVendor             = 0x046d,
1775           .idProduct            = 0x08c5,
1776           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1777           .bInterfaceSubClass   = 1,
1778           .bInterfaceProtocol   = 0 },
1779         /* Logitech Quickcam OEM Dell Notebook */
1780         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1781                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1782           .idVendor             = 0x046d,
1783           .idProduct            = 0x08c6,
1784           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1785           .bInterfaceSubClass   = 1,
1786           .bInterfaceProtocol   = 0 },
1787         /* Logitech Quickcam OEM Cisco VT Camera II */
1788         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1789                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1790           .idVendor             = 0x046d,
1791           .idProduct            = 0x08c7,
1792           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1793           .bInterfaceSubClass   = 1,
1794           .bInterfaceProtocol   = 0 },
1795         /* Apple Built-In iSight */
1796         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1797                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1798           .idVendor             = 0x05ac,
1799           .idProduct            = 0x8501,
1800           .bInterfaceClass      = USB_CLASS_VIDEO,
1801           .bInterfaceSubClass   = 1,
1802           .bInterfaceProtocol   = 0,
1803           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1804                                 | UVC_QUIRK_BUILTIN_ISIGHT },
1805         /* Genesys Logic USB 2.0 PC Camera */
1806         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1807                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1808           .idVendor             = 0x05e3,
1809           .idProduct            = 0x0505,
1810           .bInterfaceClass      = USB_CLASS_VIDEO,
1811           .bInterfaceSubClass   = 1,
1812           .bInterfaceProtocol   = 0,
1813           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1814         /* MT6227 */
1815         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1816                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1817           .idVendor             = 0x0e8d,
1818           .idProduct            = 0x0004,
1819           .bInterfaceClass      = USB_CLASS_VIDEO,
1820           .bInterfaceSubClass   = 1,
1821           .bInterfaceProtocol   = 0,
1822           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1823         /* Syntek (HP Spartan) */
1824         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1825                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1826           .idVendor             = 0x174f,
1827           .idProduct            = 0x5212,
1828           .bInterfaceClass      = USB_CLASS_VIDEO,
1829           .bInterfaceSubClass   = 1,
1830           .bInterfaceProtocol   = 0,
1831           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1832         /* Syntek (Samsung Q310) */
1833         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1834                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1835           .idVendor             = 0x174f,
1836           .idProduct            = 0x5931,
1837           .bInterfaceClass      = USB_CLASS_VIDEO,
1838           .bInterfaceSubClass   = 1,
1839           .bInterfaceProtocol   = 0,
1840           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1841         /* Asus F9SG */
1842         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1843                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1844           .idVendor             = 0x174f,
1845           .idProduct            = 0x8a31,
1846           .bInterfaceClass      = USB_CLASS_VIDEO,
1847           .bInterfaceSubClass   = 1,
1848           .bInterfaceProtocol   = 0,
1849           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1850         /* Syntek (Asus U3S) */
1851         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1852                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1853           .idVendor             = 0x174f,
1854           .idProduct            = 0x8a33,
1855           .bInterfaceClass      = USB_CLASS_VIDEO,
1856           .bInterfaceSubClass   = 1,
1857           .bInterfaceProtocol   = 0,
1858           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1859         /* Lenovo Thinkpad SL500 */
1860         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1861                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1862           .idVendor             = 0x17ef,
1863           .idProduct            = 0x480b,
1864           .bInterfaceClass      = USB_CLASS_VIDEO,
1865           .bInterfaceSubClass   = 1,
1866           .bInterfaceProtocol   = 0,
1867           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1868         /* Ecamm Pico iMage */
1869         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1870                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1871           .idVendor             = 0x18cd,
1872           .idProduct            = 0xcafe,
1873           .bInterfaceClass      = USB_CLASS_VIDEO,
1874           .bInterfaceSubClass   = 1,
1875           .bInterfaceProtocol   = 0,
1876           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
1877         /* Bodelin ProScopeHR */
1878         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1879                                 | USB_DEVICE_ID_MATCH_DEV_HI
1880                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1881           .idVendor             = 0x19ab,
1882           .idProduct            = 0x1000,
1883           .bcdDevice_hi         = 0x0126,
1884           .bInterfaceClass      = USB_CLASS_VIDEO,
1885           .bInterfaceSubClass   = 1,
1886           .bInterfaceProtocol   = 0,
1887           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
1888         /* SiGma Micro USB Web Camera */
1889         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1890                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1891           .idVendor             = 0x1c4f,
1892           .idProduct            = 0x3000,
1893           .bInterfaceClass      = USB_CLASS_VIDEO,
1894           .bInterfaceSubClass   = 1,
1895           .bInterfaceProtocol   = 0,
1896           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1897                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT
1898                                 | UVC_QUIRK_PRUNE_CONTROLS },
1899         /* Generic USB Video Class */
1900         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1901         {}
1902 };
1903
1904 MODULE_DEVICE_TABLE(usb, uvc_ids);
1905
1906 struct uvc_driver uvc_driver = {
1907         .driver = {
1908                 .name           = "uvcvideo",
1909                 .probe          = uvc_probe,
1910                 .disconnect     = uvc_disconnect,
1911                 .suspend        = uvc_suspend,
1912                 .resume         = uvc_resume,
1913                 .reset_resume   = uvc_reset_resume,
1914                 .id_table       = uvc_ids,
1915                 .supports_autosuspend = 1,
1916         },
1917 };
1918
1919 static int __init uvc_init(void)
1920 {
1921         int result;
1922
1923         INIT_LIST_HEAD(&uvc_driver.devices);
1924         INIT_LIST_HEAD(&uvc_driver.controls);
1925         mutex_init(&uvc_driver.open_mutex);
1926         mutex_init(&uvc_driver.ctrl_mutex);
1927
1928         uvc_ctrl_init();
1929
1930         result = usb_register(&uvc_driver.driver);
1931         if (result == 0)
1932                 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
1933         return result;
1934 }
1935
1936 static void __exit uvc_cleanup(void)
1937 {
1938         usb_deregister(&uvc_driver.driver);
1939 }
1940
1941 module_init(uvc_init);
1942 module_exit(uvc_cleanup);
1943
1944 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
1945 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
1946 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
1947 MODULE_PARM_DESC(quirks, "Forced device quirks");
1948 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
1949 MODULE_PARM_DESC(trace, "Trace level bitmask");
1950
1951 MODULE_AUTHOR(DRIVER_AUTHOR);
1952 MODULE_DESCRIPTION(DRIVER_DESC);
1953 MODULE_LICENSE("GPL");
1954 MODULE_VERSION(DRIVER_VERSION);
1955