drivers/media/usb/uvc/uvc_driver.c

   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   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 #include <linux/atomic.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/wait.h>
  23 #include <linux/version.h>
  24 #include <asm/unaligned.h>
  25
  26 #include <media/v4l2-common.h>
  27
  28 #include "uvcvideo.h"
  29
  30 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  31                                 "<laurent.pinchart@ideasonboard.com>"
  32 #define DRIVER_DESC             "USB Video Class driver"
  33
  34 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  35 unsigned int uvc_no_drop_param;
  36 static unsigned int uvc_quirks_param = -1;
  37 unsigned int uvc_trace_param;
  38 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  39
  40 /* ------------------------------------------------------------------------
  41  * Video formats
  42  */
  43
  44 static struct uvc_format_desc uvc_fmts[] = {
  45         {
  46                 .name           = "YUV 4:2:2 (YUYV)",
  47                 .guid           = UVC_GUID_FORMAT_YUY2,
  48                 .fcc            = V4L2_PIX_FMT_YUYV,
  49         },
  50         {
  51                 .name           = "YUV 4:2:2 (YUYV)",
  52                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  53                 .fcc            = V4L2_PIX_FMT_YUYV,
  54         },
  55         {
  56                 .name           = "YUV 4:2:0 (NV12)",
  57                 .guid           = UVC_GUID_FORMAT_NV12,
  58                 .fcc            = V4L2_PIX_FMT_NV12,
  59         },
  60         {
  61                 .name           = "MJPEG",
  62                 .guid           = UVC_GUID_FORMAT_MJPEG,
  63                 .fcc            = V4L2_PIX_FMT_MJPEG,
  64         },
  65         {
  66                 .name           = "YVU 4:2:0 (YV12)",
  67                 .guid           = UVC_GUID_FORMAT_YV12,
  68                 .fcc            = V4L2_PIX_FMT_YVU420,
  69         },
  70         {
  71                 .name           = "YUV 4:2:0 (I420)",
  72                 .guid           = UVC_GUID_FORMAT_I420,
  73                 .fcc            = V4L2_PIX_FMT_YUV420,
  74         },
  75         {
  76                 .name           = "YUV 4:2:0 (M420)",
  77                 .guid           = UVC_GUID_FORMAT_M420,
  78                 .fcc            = V4L2_PIX_FMT_M420,
  79         },
  80         {
  81                 .name           = "YUV 4:2:2 (UYVY)",
  82                 .guid           = UVC_GUID_FORMAT_UYVY,
  83                 .fcc            = V4L2_PIX_FMT_UYVY,
  84         },
  85         {
  86                 .name           = "Greyscale 8-bit (Y800)",
  87                 .guid           = UVC_GUID_FORMAT_Y800,
  88                 .fcc            = V4L2_PIX_FMT_GREY,
  89         },
  90         {
  91                 .name           = "Greyscale 8-bit (Y8  )",
  92                 .guid           = UVC_GUID_FORMAT_Y8,
  93                 .fcc            = V4L2_PIX_FMT_GREY,
  94         },
  95         {
  96                 .name           = "Greyscale 10-bit (Y10 )",
  97                 .guid           = UVC_GUID_FORMAT_Y10,
  98                 .fcc            = V4L2_PIX_FMT_Y10,
  99         },
 100         {
 101                 .name           = "Greyscale 12-bit (Y12 )",
 102                 .guid           = UVC_GUID_FORMAT_Y12,
 103                 .fcc            = V4L2_PIX_FMT_Y12,
 104         },
 105         {
 106                 .name           = "Greyscale 16-bit (Y16 )",
 107                 .guid           = UVC_GUID_FORMAT_Y16,
 108                 .fcc            = V4L2_PIX_FMT_Y16,
 109         },
 110         {
 111                 .name           = "RGB Bayer",
 112                 .guid           = UVC_GUID_FORMAT_BY8,
 113                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 114         },
 115         {
 116                 .name           = "RGB565",
 117                 .guid           = UVC_GUID_FORMAT_RGBP,
 118                 .fcc            = V4L2_PIX_FMT_RGB565,
 119         },
 120         {
 121                 .name           = "H.264",
 122                 .guid           = UVC_GUID_FORMAT_H264,
 123                 .fcc            = V4L2_PIX_FMT_H264,
 124         },
 125 };
 126
 127 /* ------------------------------------------------------------------------
 128  * Utility functions
 129  */
 130
 131 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 132                 __u8 epaddr)
 133 {
 134         struct usb_host_endpoint *ep;
 135         unsigned int i;
 136
 137         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 138                 ep = &alts->endpoint[i];
 139                 if (ep->desc.bEndpointAddress == epaddr)
 140                         return ep;
 141         }
 142
 143         return NULL;
 144 }
 145
 146 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 147 {
 148         unsigned int len = ARRAY_SIZE(uvc_fmts);
 149         unsigned int i;
 150
 151         for (i = 0; i < len; ++i) {
 152                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 153                         return &uvc_fmts[i];
 154         }
 155
 156         return NULL;
 157 }
 158
 159 static __u32 uvc_colorspace(const __u8 primaries)
 160 {
 161         static const __u8 colorprimaries[] = {
 162                 0,
 163                 V4L2_COLORSPACE_SRGB,
 164                 V4L2_COLORSPACE_470_SYSTEM_M,
 165                 V4L2_COLORSPACE_470_SYSTEM_BG,
 166                 V4L2_COLORSPACE_SMPTE170M,
 167                 V4L2_COLORSPACE_SMPTE240M,
 168         };
 169
 170         if (primaries < ARRAY_SIZE(colorprimaries))
 171                 return colorprimaries[primaries];
 172
 173         return 0;
 174 }
 175
 176 /* Simplify a fraction using a simple continued fraction decomposition. The
 177  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 178  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 179  * arbitrary parameters to remove non-significative terms from the simple
 180  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 181  * respectively seems to give nice results.
 182  */
 183 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 184                 unsigned int n_terms, unsigned int threshold)
 185 {
 186         uint32_t *an;
 187         uint32_t x, y, r;
 188         unsigned int i, n;
 189
 190         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 191         if (an == NULL)
 192                 return;
 193
 194         /* Convert the fraction to a simple continued fraction. See
 195          * http://mathforum.org/dr.math/faq/faq.fractions.html
 196          * Stop if the current term is bigger than or equal to the given
 197          * threshold.
 198          */
 199         x = *numerator;
 200         y = *denominator;
 201
 202         for (n = 0; n < n_terms && y != 0; ++n) {
 203                 an[n] = x / y;
 204                 if (an[n] >= threshold) {
 205                         if (n < 2)
 206                                 n++;
 207                         break;
 208                 }
 209
 210                 r = x - an[n] * y;
 211                 x = y;
 212                 y = r;
 213         }
 214
 215         /* Expand the simple continued fraction back to an integer fraction. */
 216         x = 0;
 217         y = 1;
 218
 219         for (i = n; i > 0; --i) {
 220                 r = y;
 221                 y = an[i-1] * y + x;
 222                 x = r;
 223         }
 224
 225         *numerator = y;
 226         *denominator = x;
 227         kfree(an);
 228 }
 229
 230 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 231  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 232  * arithmetic only.
 233  */
 234 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 235 {
 236         uint32_t multiplier;
 237
 238         /* Saturate the result if the operation would overflow. */
 239         if (denominator == 0 ||
 240             numerator/denominator >= ((uint32_t)-1)/10000000)
 241                 return (uint32_t)-1;
 242
 243         /* Divide both the denominator and the multiplier by two until
 244          * numerator * multiplier doesn't overflow. If anyone knows a better
 245          * algorithm please let me know.
 246          */
 247         multiplier = 10000000;
 248         while (numerator > ((uint32_t)-1)/multiplier) {
 249                 multiplier /= 2;
 250                 denominator /= 2;
 251         }
 252
 253         return denominator ? numerator * multiplier / denominator : 0;
 254 }
 255
 256 /* ------------------------------------------------------------------------
 257  * Terminal and unit management
 258  */
 259
 260 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 261 {
 262         struct uvc_entity *entity;
 263
 264         list_for_each_entry(entity, &dev->entities, list) {
 265                 if (entity->id == id)
 266                         return entity;
 267         }
 268
 269         return NULL;
 270 }
 271
 272 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 273         int id, struct uvc_entity *entity)
 274 {
 275         unsigned int i;
 276
 277         if (entity == NULL)
 278                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 279
 280         list_for_each_entry_continue(entity, &dev->entities, list) {
 281                 for (i = 0; i < entity->bNrInPins; ++i)
 282                         if (entity->baSourceID[i] == id)
 283                                 return entity;
 284         }
 285
 286         return NULL;
 287 }
 288
 289 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 290 {
 291         struct uvc_streaming *stream;
 292
 293         list_for_each_entry(stream, &dev->streams, list) {
 294                 if (stream->header.bTerminalLink == id)
 295                         return stream;
 296         }
 297
 298         return NULL;
 299 }
 300
 301 /* ------------------------------------------------------------------------
 302  * Descriptors parsing
 303  */
 304
 305 static int uvc_parse_format(struct uvc_device *dev,
 306         struct uvc_streaming *streaming, struct uvc_format *format,
 307         __u32 **intervals, unsigned char *buffer, int buflen)
 308 {
 309         struct usb_interface *intf = streaming->intf;
 310         struct usb_host_interface *alts = intf->cur_altsetting;
 311         struct uvc_format_desc *fmtdesc;
 312         struct uvc_frame *frame;
 313         const unsigned char *start = buffer;
 314         unsigned int interval;
 315         unsigned int i, n;
 316         __u8 ftype;
 317
 318         format->type = buffer[2];
 319         format->index = buffer[3];
 320
 321         switch (buffer[2]) {
 322         case UVC_VS_FORMAT_UNCOMPRESSED:
 323         case UVC_VS_FORMAT_FRAME_BASED:
 324                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 325                 if (buflen < n) {
 326                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 327                                "interface %d FORMAT error\n",
 328                                dev->udev->devnum,
 329                                alts->desc.bInterfaceNumber);
 330                         return -EINVAL;
 331                 }
 332
 333                 /* Find the format descriptor from its GUID. */
 334                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 335
 336                 if (fmtdesc != NULL) {
 337                         strlcpy(format->name, fmtdesc->name,
 338                                 sizeof format->name);
 339                         format->fcc = fmtdesc->fcc;
 340                 } else {
 341                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 342                                 &buffer[5]);
 343                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 344                                 &buffer[5]);
 345                         format->fcc = 0;
 346                 }
 347
 348                 format->bpp = buffer[21];
 349                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 350                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 351                 } else {
 352                         ftype = UVC_VS_FRAME_FRAME_BASED;
 353                         if (buffer[27])
 354                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 355                 }
 356                 break;
 357
 358         case UVC_VS_FORMAT_MJPEG:
 359                 if (buflen < 11) {
 360                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 361                                "interface %d FORMAT error\n",
 362                                dev->udev->devnum,
 363                                alts->desc.bInterfaceNumber);
 364                         return -EINVAL;
 365                 }
 366
 367                 strlcpy(format->name, "MJPEG", sizeof format->name);
 368                 format->fcc = V4L2_PIX_FMT_MJPEG;
 369                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 370                 format->bpp = 0;
 371                 ftype = UVC_VS_FRAME_MJPEG;
 372                 break;
 373
 374         case UVC_VS_FORMAT_DV:
 375                 if (buflen < 9) {
 376                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 377                                "interface %d FORMAT error\n",
 378                                dev->udev->devnum,
 379                                alts->desc.bInterfaceNumber);
 380                         return -EINVAL;
 381                 }
 382
 383                 switch (buffer[8] & 0x7f) {
 384                 case 0:
 385                         strlcpy(format->name, "SD-DV", sizeof format->name);
 386                         break;
 387                 case 1:
 388                         strlcpy(format->name, "SDL-DV", sizeof format->name);
 389                         break;
 390                 case 2:
 391                         strlcpy(format->name, "HD-DV", sizeof format->name);
 392                         break;
 393                 default:
 394                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 395                                "interface %d: unknown DV format %u\n",
 396                                dev->udev->devnum,
 397                                alts->desc.bInterfaceNumber, buffer[8]);
 398                         return -EINVAL;
 399                 }
 400
 401                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 402                         sizeof format->name);
 403
 404                 format->fcc = V4L2_PIX_FMT_DV;
 405                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 406                 format->bpp = 0;
 407                 ftype = 0;
 408
 409                 /* Create a dummy frame descriptor. */
 410                 frame = &format->frame[0];
 411                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 412                 frame->bFrameIntervalType = 1;
 413                 frame->dwDefaultFrameInterval = 1;
 414                 frame->dwFrameInterval = *intervals;
 415                 *(*intervals)++ = 1;
 416                 format->nframes = 1;
 417                 break;
 418
 419         case UVC_VS_FORMAT_MPEG2TS:
 420         case UVC_VS_FORMAT_STREAM_BASED:
 421                 /* Not supported yet. */
 422         default:
 423                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 424                        "interface %d unsupported format %u\n",
 425                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 426                        buffer[2]);
 427                 return -EINVAL;
 428         }
 429
 430         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 431
 432         buflen -= buffer[0];
 433         buffer += buffer[0];
 434
 435         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 436          * based formats have frame descriptors.
 437          */
 438         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 439                buffer[2] == ftype) {
 440                 frame = &format->frame[format->nframes];
 441                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 442                         n = buflen > 25 ? buffer[25] : 0;
 443                 else
 444                         n = buflen > 21 ? buffer[21] : 0;
 445
 446                 n = n ? n : 3;
 447
 448                 if (buflen < 26 + 4*n) {
 449                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 450                                "interface %d FRAME error\n", dev->udev->devnum,
 451                                alts->desc.bInterfaceNumber);
 452                         return -EINVAL;
 453                 }
 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 != UVC_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 to 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 that 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                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 507                         frame->bFrameIntervalType = 1;
 508                         frame->dwFrameInterval[0] =
 509                                 frame->dwDefaultFrameInterval;
 510                 }
 511
 512                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 513                         frame->wWidth, frame->wHeight,
 514                         10000000/frame->dwDefaultFrameInterval,
 515                         (100000000/frame->dwDefaultFrameInterval)%10);
 516
 517                 format->nframes++;
 518                 buflen -= buffer[0];
 519                 buffer += buffer[0];
 520         }
 521
 522         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 523             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 524                 buflen -= buffer[0];
 525                 buffer += buffer[0];
 526         }
 527
 528         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 529             buffer[2] == UVC_VS_COLORFORMAT) {
 530                 if (buflen < 6) {
 531                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 532                                "interface %d COLORFORMAT error\n",
 533                                dev->udev->devnum,
 534                                alts->desc.bInterfaceNumber);
 535                         return -EINVAL;
 536                 }
 537
 538                 format->colorspace = uvc_colorspace(buffer[3]);
 539
 540                 buflen -= buffer[0];
 541                 buffer += buffer[0];
 542         }
 543
 544         return buffer - start;
 545 }
 546
 547 static int uvc_parse_streaming(struct uvc_device *dev,
 548         struct usb_interface *intf)
 549 {
 550         struct uvc_streaming *streaming = NULL;
 551         struct uvc_format *format;
 552         struct uvc_frame *frame;
 553         struct usb_host_interface *alts = &intf->altsetting[0];
 554         unsigned char *_buffer, *buffer = alts->extra;
 555         int _buflen, buflen = alts->extralen;
 556         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 557         unsigned int size, i, n, p;
 558         __u32 *interval;
 559         __u16 psize;
 560         int ret = -EINVAL;
 561
 562         if (intf->cur_altsetting->desc.bInterfaceSubClass
 563                 != UVC_SC_VIDEOSTREAMING) {
 564                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 565                         "video streaming interface\n", dev->udev->devnum,
 566                         intf->altsetting[0].desc.bInterfaceNumber);
 567                 return -EINVAL;
 568         }
 569
 570         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 571                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 572                         "claimed\n", dev->udev->devnum,
 573                         intf->altsetting[0].desc.bInterfaceNumber);
 574                 return -EINVAL;
 575         }
 576
 577         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 578         if (streaming == NULL) {
 579                 usb_driver_release_interface(&uvc_driver.driver, intf);
 580                 return -EINVAL;
 581         }
 582
 583         mutex_init(&streaming->mutex);
 584         streaming->dev = dev;
 585         streaming->intf = usb_get_intf(intf);
 586         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 587
 588         /* The Pico iMage webcam has its class-specific interface descriptors
 589          * after the endpoint descriptors.
 590          */
 591         if (buflen == 0) {
 592                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 593                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 594
 595                         if (ep->extralen == 0)
 596                                 continue;
 597
 598                         if (ep->extralen > 2 &&
 599                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 600                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 601                                         "from endpoint %u.\n", i);
 602                                 buffer = alts->endpoint[i].extra;
 603                                 buflen = alts->endpoint[i].extralen;
 604                                 break;
 605                         }
 606                 }
 607         }
 608
 609         /* Skip the standard interface descriptors. */
 610         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 611                 buflen -= buffer[0];
 612                 buffer += buffer[0];
 613         }
 614
 615         if (buflen <= 2) {
 616                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 617                         "interface descriptors found.\n");
 618                 goto error;
 619         }
 620
 621         /* Parse the header descriptor. */
 622         switch (buffer[2]) {
 623         case UVC_VS_OUTPUT_HEADER:
 624                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 625                 size = 9;
 626                 break;
 627
 628         case UVC_VS_INPUT_HEADER:
 629                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 630                 size = 13;
 631                 break;
 632
 633         default:
 634                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 635                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 636                         alts->desc.bInterfaceNumber);
 637                 goto error;
 638         }
 639
 640         p = buflen >= 4 ? buffer[3] : 0;
 641         n = buflen >= size ? buffer[size-1] : 0;
 642
 643         if (buflen < size + p*n) {
 644                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 645                         "interface %d HEADER descriptor is invalid.\n",
 646                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 647                 goto error;
 648         }
 649
 650         streaming->header.bNumFormats = p;
 651         streaming->header.bEndpointAddress = buffer[6];
 652         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 653                 streaming->header.bmInfo = buffer[7];
 654                 streaming->header.bTerminalLink = buffer[8];
 655                 streaming->header.bStillCaptureMethod = buffer[9];
 656                 streaming->header.bTriggerSupport = buffer[10];
 657                 streaming->header.bTriggerUsage = buffer[11];
 658         } else {
 659                 streaming->header.bTerminalLink = buffer[7];
 660         }
 661         streaming->header.bControlSize = n;
 662
 663         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 664                                                 GFP_KERNEL);
 665         if (streaming->header.bmaControls == NULL) {
 666                 ret = -ENOMEM;
 667                 goto error;
 668         }
 669
 670         buflen -= buffer[0];
 671         buffer += buffer[0];
 672
 673         _buffer = buffer;
 674         _buflen = buflen;
 675
 676         /* Count the format and frame descriptors. */
 677         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 678                 switch (_buffer[2]) {
 679                 case UVC_VS_FORMAT_UNCOMPRESSED:
 680                 case UVC_VS_FORMAT_MJPEG:
 681                 case UVC_VS_FORMAT_FRAME_BASED:
 682                         nformats++;
 683                         break;
 684
 685                 case UVC_VS_FORMAT_DV:
 686                         /* DV format has no frame descriptor. We will create a
 687                          * dummy frame descriptor with a dummy frame interval.
 688                          */
 689                         nformats++;
 690                         nframes++;
 691                         nintervals++;
 692                         break;
 693
 694                 case UVC_VS_FORMAT_MPEG2TS:
 695                 case UVC_VS_FORMAT_STREAM_BASED:
 696                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 697                                 "interface %d FORMAT %u is not supported.\n",
 698                                 dev->udev->devnum,
 699                                 alts->desc.bInterfaceNumber, _buffer[2]);
 700                         break;
 701
 702                 case UVC_VS_FRAME_UNCOMPRESSED:
 703                 case UVC_VS_FRAME_MJPEG:
 704                         nframes++;
 705                         if (_buflen > 25)
 706                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 707                         break;
 708
 709                 case UVC_VS_FRAME_FRAME_BASED:
 710                         nframes++;
 711                         if (_buflen > 21)
 712                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 713                         break;
 714                 }
 715
 716                 _buflen -= _buffer[0];
 717                 _buffer += _buffer[0];
 718         }
 719
 720         if (nformats == 0) {
 721                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 722                         "%d has no supported formats defined.\n",
 723                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 724                 goto error;
 725         }
 726
 727         size = nformats * sizeof *format + nframes * sizeof *frame
 728              + nintervals * sizeof *interval;
 729         format = kzalloc(size, GFP_KERNEL);
 730         if (format == NULL) {
 731                 ret = -ENOMEM;
 732                 goto error;
 733         }
 734
 735         frame = (struct uvc_frame *)&format[nformats];
 736         interval = (__u32 *)&frame[nframes];
 737
 738         streaming->format = format;
 739         streaming->nformats = nformats;
 740
 741         /* Parse the format descriptors. */
 742         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 743                 switch (buffer[2]) {
 744                 case UVC_VS_FORMAT_UNCOMPRESSED:
 745                 case UVC_VS_FORMAT_MJPEG:
 746                 case UVC_VS_FORMAT_DV:
 747                 case UVC_VS_FORMAT_FRAME_BASED:
 748                         format->frame = frame;
 749                         ret = uvc_parse_format(dev, streaming, format,
 750                                 &interval, buffer, buflen);
 751                         if (ret < 0)
 752                                 goto error;
 753
 754                         frame += format->nframes;
 755                         format++;
 756
 757                         buflen -= ret;
 758                         buffer += ret;
 759                         continue;
 760
 761                 default:
 762                         break;
 763                 }
 764
 765                 buflen -= buffer[0];
 766                 buffer += buffer[0];
 767         }
 768
 769         if (buflen)
 770                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 771                         "%d has %u bytes of trailing descriptor garbage.\n",
 772                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 773
 774         /* Parse the alternate settings to find the maximum bandwidth. */
 775         for (i = 0; i < intf->num_altsetting; ++i) {
 776                 struct usb_host_endpoint *ep;
 777                 alts = &intf->altsetting[i];
 778                 ep = uvc_find_endpoint(alts,
 779                                 streaming->header.bEndpointAddress);
 780                 if (ep == NULL)
 781                         continue;
 782
 783                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 784                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 785                 if (psize > streaming->maxpsize)
 786                         streaming->maxpsize = psize;
 787         }
 788
 789         list_add_tail(&streaming->list, &dev->streams);
 790         return 0;
 791
 792 error:
 793         usb_driver_release_interface(&uvc_driver.driver, intf);
 794         usb_put_intf(intf);
 795         kfree(streaming->format);
 796         kfree(streaming->header.bmaControls);
 797         kfree(streaming);
 798         return ret;
 799 }
 800
 801 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 802                 unsigned int num_pads, unsigned int extra_size)
 803 {
 804         struct uvc_entity *entity;
 805         unsigned int num_inputs;
 806         unsigned int size;
 807         unsigned int i;
 808
 809         extra_size = ALIGN(extra_size, sizeof(*entity->pads));
 810         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 811         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 812              + num_inputs;
 813         entity = kzalloc(size, GFP_KERNEL);
 814         if (entity == NULL)
 815                 return NULL;
 816
 817         entity->id = id;
 818         entity->type = type;
 819
 820         entity->num_links = 0;
 821         entity->num_pads = num_pads;
 822         entity->pads = ((void *)(entity + 1)) + extra_size;
 823
 824         for (i = 0; i < num_inputs; ++i)
 825                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 826         if (!UVC_ENTITY_IS_OTERM(entity))
 827                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 828
 829         entity->bNrInPins = num_inputs;
 830         entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
 831
 832         return entity;
 833 }
 834
 835 /* Parse vendor-specific extensions. */
 836 static int uvc_parse_vendor_control(struct uvc_device *dev,
 837         const unsigned char *buffer, int buflen)
 838 {
 839         struct usb_device *udev = dev->udev;
 840         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 841         struct uvc_entity *unit;
 842         unsigned int n, p;
 843         int handled = 0;
 844
 845         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 846         case 0x046d:            /* Logitech */
 847                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 848                         break;
 849
 850                 /* Logitech implements several vendor specific functions
 851                  * through vendor specific extension units (LXU).
 852                  *
 853                  * The LXU descriptors are similar to XU descriptors
 854                  * (see "USB Device Video Class for Video Devices", section
 855                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 856                  * differences:
 857                  *
 858                  * ----------------------------------------------------------
 859                  * 0            bLength         1        Number
 860                  *      Size of this descriptor, in bytes: 24+p+n*2
 861                  * ----------------------------------------------------------
 862                  * 23+p+n       bmControlsType  N       Bitmap
 863                  *      Individual bits in the set are defined:
 864                  *      0: Absolute
 865                  *      1: Relative
 866                  *
 867                  *      This bitset is mapped exactly the same as bmControls.
 868                  * ----------------------------------------------------------
 869                  * 23+p+n*2     bReserved       1       Boolean
 870                  * ----------------------------------------------------------
 871                  * 24+p+n*2     iExtension      1       Index
 872                  *      Index of a string descriptor that describes this
 873                  *      extension unit.
 874                  * ----------------------------------------------------------
 875                  */
 876                 p = buflen >= 22 ? buffer[21] : 0;
 877                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 878
 879                 if (buflen < 25 + p + 2*n) {
 880                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 881                                 "interface %d EXTENSION_UNIT error\n",
 882                                 udev->devnum, alts->desc.bInterfaceNumber);
 883                         break;
 884                 }
 885
 886                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
 887                                         p + 1, 2*n);
 888                 if (unit == NULL)
 889                         return -ENOMEM;
 890
 891                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 892                 unit->extension.bNumControls = buffer[20];
 893                 memcpy(unit->baSourceID, &buffer[22], p);
 894                 unit->extension.bControlSize = buffer[22+p];
 895                 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
 896                 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
 897                                                + n;
 898                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 899
 900                 if (buffer[24+p+2*n] != 0)
 901                         usb_string(udev, buffer[24+p+2*n], unit->name,
 902                                    sizeof unit->name);
 903                 else
 904                         sprintf(unit->name, "Extension %u", buffer[3]);
 905
 906                 list_add_tail(&unit->list, &dev->entities);
 907                 handled = 1;
 908                 break;
 909         }
 910
 911         return handled;
 912 }
 913
 914 static int uvc_parse_standard_control(struct uvc_device *dev,
 915         const unsigned char *buffer, int buflen)
 916 {
 917         struct usb_device *udev = dev->udev;
 918         struct uvc_entity *unit, *term;
 919         struct usb_interface *intf;
 920         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 921         unsigned int i, n, p, len;
 922         __u16 type;
 923
 924         switch (buffer[2]) {
 925         case UVC_VC_HEADER:
 926                 n = buflen >= 12 ? buffer[11] : 0;
 927
 928                 if (buflen < 12 || buflen < 12 + n) {
 929                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 930                                 "interface %d HEADER error\n", udev->devnum,
 931                                 alts->desc.bInterfaceNumber);
 932                         return -EINVAL;
 933                 }
 934
 935                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 936                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 937
 938                 /* Parse all USB Video Streaming interfaces. */
 939                 for (i = 0; i < n; ++i) {
 940                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 941                         if (intf == NULL) {
 942                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 943                                         "interface %d doesn't exists\n",
 944                                         udev->devnum, i);
 945                                 continue;
 946                         }
 947
 948                         uvc_parse_streaming(dev, intf);
 949                 }
 950                 break;
 951
 952         case UVC_VC_INPUT_TERMINAL:
 953                 if (buflen < 8) {
 954                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 955                                 "interface %d INPUT_TERMINAL error\n",
 956                                 udev->devnum, alts->desc.bInterfaceNumber);
 957                         return -EINVAL;
 958                 }
 959
 960                 /* Make sure the terminal type MSB is not null, otherwise it
 961                  * could be confused with a unit.
 962                  */
 963                 type = get_unaligned_le16(&buffer[4]);
 964                 if ((type & 0xff00) == 0) {
 965                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 966                                 "interface %d INPUT_TERMINAL %d has invalid "
 967                                 "type 0x%04x, skipping\n", udev->devnum,
 968                                 alts->desc.bInterfaceNumber,
 969                                 buffer[3], type);
 970                         return 0;
 971                 }
 972
 973                 n = 0;
 974                 p = 0;
 975                 len = 8;
 976
 977                 if (type == UVC_ITT_CAMERA) {
 978                         n = buflen >= 15 ? buffer[14] : 0;
 979                         len = 15;
 980
 981                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
 982                         n = buflen >= 9 ? buffer[8] : 0;
 983                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 984                         len = 10;
 985                 }
 986
 987                 if (buflen < len + n + p) {
 988                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 989                                 "interface %d INPUT_TERMINAL error\n",
 990                                 udev->devnum, alts->desc.bInterfaceNumber);
 991                         return -EINVAL;
 992                 }
 993
 994                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
 995                                         1, n + p);
 996                 if (term == NULL)
 997                         return -ENOMEM;
 998
 999                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1000                         term->camera.bControlSize = n;
1001                         term->camera.bmControls = (__u8 *)term + sizeof *term;
1002                         term->camera.wObjectiveFocalLengthMin =
1003                                 get_unaligned_le16(&buffer[8]);
1004                         term->camera.wObjectiveFocalLengthMax =
1005                                 get_unaligned_le16(&buffer[10]);
1006                         term->camera.wOcularFocalLength =
1007                                 get_unaligned_le16(&buffer[12]);
1008                         memcpy(term->camera.bmControls, &buffer[15], n);
1009                 } else if (UVC_ENTITY_TYPE(term) ==
1010                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1011                         term->media.bControlSize = n;
1012                         term->media.bmControls = (__u8 *)term + sizeof *term;
1013                         term->media.bTransportModeSize = p;
1014                         term->media.bmTransportModes = (__u8 *)term
1015                                                      + sizeof *term + n;
1016                         memcpy(term->media.bmControls, &buffer[9], n);
1017                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1018                 }
1019
1020                 if (buffer[7] != 0)
1021                         usb_string(udev, buffer[7], term->name,
1022                                    sizeof term->name);
1023                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1024                         sprintf(term->name, "Camera %u", buffer[3]);
1025                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1026                         sprintf(term->name, "Media %u", buffer[3]);
1027                 else
1028                         sprintf(term->name, "Input %u", buffer[3]);
1029
1030                 list_add_tail(&term->list, &dev->entities);
1031                 break;
1032
1033         case UVC_VC_OUTPUT_TERMINAL:
1034                 if (buflen < 9) {
1035                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1036                                 "interface %d OUTPUT_TERMINAL error\n",
1037                                 udev->devnum, alts->desc.bInterfaceNumber);
1038                         return -EINVAL;
1039                 }
1040
1041                 /* Make sure the terminal type MSB is not null, otherwise it
1042                  * could be confused with a unit.
1043                  */
1044                 type = get_unaligned_le16(&buffer[4]);
1045                 if ((type & 0xff00) == 0) {
1046                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1047                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1048                                 "type 0x%04x, skipping\n", udev->devnum,
1049                                 alts->desc.bInterfaceNumber, buffer[3], type);
1050                         return 0;
1051                 }
1052
1053                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1054                                         1, 0);
1055                 if (term == NULL)
1056                         return -ENOMEM;
1057
1058                 memcpy(term->baSourceID, &buffer[7], 1);
1059
1060                 if (buffer[8] != 0)
1061                         usb_string(udev, buffer[8], term->name,
1062                                    sizeof term->name);
1063                 else
1064                         sprintf(term->name, "Output %u", buffer[3]);
1065
1066                 list_add_tail(&term->list, &dev->entities);
1067                 break;
1068
1069         case UVC_VC_SELECTOR_UNIT:
1070                 p = buflen >= 5 ? buffer[4] : 0;
1071
1072                 if (buflen < 5 || buflen < 6 + p) {
1073                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1074                                 "interface %d SELECTOR_UNIT error\n",
1075                                 udev->devnum, alts->desc.bInterfaceNumber);
1076                         return -EINVAL;
1077                 }
1078
1079                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1080                 if (unit == NULL)
1081                         return -ENOMEM;
1082
1083                 memcpy(unit->baSourceID, &buffer[5], p);
1084
1085                 if (buffer[5+p] != 0)
1086                         usb_string(udev, buffer[5+p], unit->name,
1087                                    sizeof unit->name);
1088                 else
1089                         sprintf(unit->name, "Selector %u", buffer[3]);
1090
1091                 list_add_tail(&unit->list, &dev->entities);
1092                 break;
1093
1094         case UVC_VC_PROCESSING_UNIT:
1095                 n = buflen >= 8 ? buffer[7] : 0;
1096                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1097
1098                 if (buflen < p + n) {
1099                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1100                                 "interface %d PROCESSING_UNIT error\n",
1101                                 udev->devnum, alts->desc.bInterfaceNumber);
1102                         return -EINVAL;
1103                 }
1104
1105                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1106                 if (unit == NULL)
1107                         return -ENOMEM;
1108
1109                 memcpy(unit->baSourceID, &buffer[4], 1);
1110                 unit->processing.wMaxMultiplier =
1111                         get_unaligned_le16(&buffer[5]);
1112                 unit->processing.bControlSize = buffer[7];
1113                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1114                 memcpy(unit->processing.bmControls, &buffer[8], n);
1115                 if (dev->uvc_version >= 0x0110)
1116                         unit->processing.bmVideoStandards = buffer[9+n];
1117
1118                 if (buffer[8+n] != 0)
1119                         usb_string(udev, buffer[8+n], unit->name,
1120                                    sizeof unit->name);
1121                 else
1122                         sprintf(unit->name, "Processing %u", buffer[3]);
1123
1124                 list_add_tail(&unit->list, &dev->entities);
1125                 break;
1126
1127         case UVC_VC_EXTENSION_UNIT:
1128                 p = buflen >= 22 ? buffer[21] : 0;
1129                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1130
1131                 if (buflen < 24 + p + n) {
1132                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1133                                 "interface %d EXTENSION_UNIT error\n",
1134                                 udev->devnum, alts->desc.bInterfaceNumber);
1135                         return -EINVAL;
1136                 }
1137
1138                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1139                 if (unit == NULL)
1140                         return -ENOMEM;
1141
1142                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1143                 unit->extension.bNumControls = buffer[20];
1144                 memcpy(unit->baSourceID, &buffer[22], p);
1145                 unit->extension.bControlSize = buffer[22+p];
1146                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1147                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1148
1149                 if (buffer[23+p+n] != 0)
1150                         usb_string(udev, buffer[23+p+n], unit->name,
1151                                    sizeof unit->name);
1152                 else
1153                         sprintf(unit->name, "Extension %u", buffer[3]);
1154
1155                 list_add_tail(&unit->list, &dev->entities);
1156                 break;
1157
1158         default:
1159                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1160                         "descriptor (%u)\n", buffer[2]);
1161                 break;
1162         }
1163
1164         return 0;
1165 }
1166
1167 static int uvc_parse_control(struct uvc_device *dev)
1168 {
1169         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1170         unsigned char *buffer = alts->extra;
1171         int buflen = alts->extralen;
1172         int ret;
1173
1174         /* Parse the default alternate setting only, as the UVC specification
1175          * defines a single alternate setting, the default alternate setting
1176          * zero.
1177          */
1178
1179         while (buflen > 2) {
1180                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1181                     buffer[1] != USB_DT_CS_INTERFACE)
1182                         goto next_descriptor;
1183
1184                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1185                         return ret;
1186
1187 next_descriptor:
1188                 buflen -= buffer[0];
1189                 buffer += buffer[0];
1190         }
1191
1192         /* Check if the optional status endpoint is present. Built-in iSight
1193          * webcams have an interrupt endpoint but spit proprietary data that
1194          * don't conform to the UVC status endpoint messages. Don't try to
1195          * handle the interrupt endpoint for those cameras.
1196          */
1197         if (alts->desc.bNumEndpoints == 1 &&
1198             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1199                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1200                 struct usb_endpoint_descriptor *desc = &ep->desc;
1201
1202                 if (usb_endpoint_is_int_in(desc) &&
1203                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1204                     desc->bInterval != 0) {
1205                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1206                                 "(addr %02x).\n", desc->bEndpointAddress);
1207                         dev->int_ep = ep;
1208                 }
1209         }
1210
1211         return 0;
1212 }
1213
1214 /* ------------------------------------------------------------------------
1215  * UVC device scan
1216  */
1217
1218 /*
1219  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1220  * and containing the following units:
1221  *
1222  * - one or more Output Terminals (USB Streaming or Display)
1223  * - zero or one Processing Unit
1224  * - zero, one or more single-input Selector Units
1225  * - zero or one multiple-input Selector Units, provided all inputs are
1226  *   connected to input terminals
1227  * - zero, one or mode single-input Extension Units
1228  * - one or more Input Terminals (Camera, External or USB Streaming)
1229  *
1230  * The terminal and units must match on of the following structures:
1231  *
1232  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1233  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1234  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1235  *
1236  *                 +---------+    +---------+ -> OTT_*(0)
1237  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1238  *                 +---------+    +---------+ -> OTT_*(n)
1239  *
1240  * The Processing Unit and Extension Units can be in any order. Additional
1241  * Extension Units connected to the main chain as single-unit branches are
1242  * also supported. Single-input Selector Units are ignored.
1243  */
1244 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1245         struct uvc_entity *entity)
1246 {
1247         switch (UVC_ENTITY_TYPE(entity)) {
1248         case UVC_VC_EXTENSION_UNIT:
1249                 if (uvc_trace_param & UVC_TRACE_PROBE)
1250                         printk(" <- XU %d", entity->id);
1251
1252                 if (entity->bNrInPins != 1) {
1253                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1254                                 "than 1 input pin.\n", entity->id);
1255                         return -1;
1256                 }
1257
1258                 break;
1259
1260         case UVC_VC_PROCESSING_UNIT:
1261                 if (uvc_trace_param & UVC_TRACE_PROBE)
1262                         printk(" <- PU %d", entity->id);
1263
1264                 if (chain->processing != NULL) {
1265                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1266                                 "Processing Units in chain.\n");
1267                         return -1;
1268                 }
1269
1270                 chain->processing = entity;
1271                 break;
1272
1273         case UVC_VC_SELECTOR_UNIT:
1274                 if (uvc_trace_param & UVC_TRACE_PROBE)
1275                         printk(" <- SU %d", entity->id);
1276
1277                 /* Single-input selector units are ignored. */
1278                 if (entity->bNrInPins == 1)
1279                         break;
1280
1281                 if (chain->selector != NULL) {
1282                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1283                                 "Units in chain.\n");
1284                         return -1;
1285                 }
1286
1287                 chain->selector = entity;
1288                 break;
1289
1290         case UVC_ITT_VENDOR_SPECIFIC:
1291         case UVC_ITT_CAMERA:
1292         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1293                 if (uvc_trace_param & UVC_TRACE_PROBE)
1294                         printk(" <- IT %d\n", entity->id);
1295
1296                 break;
1297
1298         case UVC_OTT_VENDOR_SPECIFIC:
1299         case UVC_OTT_DISPLAY:
1300         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1301                 if (uvc_trace_param & UVC_TRACE_PROBE)
1302                         printk(" OT %d", entity->id);
1303
1304                 break;
1305
1306         case UVC_TT_STREAMING:
1307                 if (UVC_ENTITY_IS_ITERM(entity)) {
1308                         if (uvc_trace_param & UVC_TRACE_PROBE)
1309                                 printk(" <- IT %d\n", entity->id);
1310                 } else {
1311                         if (uvc_trace_param & UVC_TRACE_PROBE)
1312                                 printk(" OT %d", entity->id);
1313                 }
1314
1315                 break;
1316
1317         default:
1318                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1319                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1320                 return -1;
1321         }
1322
1323         list_add_tail(&entity->chain, &chain->entities);
1324         return 0;
1325 }
1326
1327 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1328         struct uvc_entity *entity, struct uvc_entity *prev)
1329 {
1330         struct uvc_entity *forward;
1331         int found;
1332
1333         /* Forward scan */
1334         forward = NULL;
1335         found = 0;
1336
1337         while (1) {
1338                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1339                         forward);
1340                 if (forward == NULL)
1341                         break;
1342                 if (forward == prev)
1343                         continue;
1344
1345                 switch (UVC_ENTITY_TYPE(forward)) {
1346                 case UVC_VC_EXTENSION_UNIT:
1347                         if (forward->bNrInPins != 1) {
1348                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1349                                           "has more than 1 input pin.\n",
1350                                           entity->id);
1351                                 return -EINVAL;
1352                         }
1353
1354                         list_add_tail(&forward->chain, &chain->entities);
1355                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1356                                 if (!found)
1357                                         printk(" (->");
1358
1359                                 printk(" XU %d", forward->id);
1360                                 found = 1;
1361                         }
1362                         break;
1363
1364                 case UVC_OTT_VENDOR_SPECIFIC:
1365                 case UVC_OTT_DISPLAY:
1366                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1367                 case UVC_TT_STREAMING:
1368                         if (UVC_ENTITY_IS_ITERM(forward)) {
1369                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1370                                         "terminal %u.\n", forward->id);
1371                                 return -EINVAL;
1372                         }
1373
1374                         list_add_tail(&forward->chain, &chain->entities);
1375                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1376                                 if (!found)
1377                                         printk(" (->");
1378
1379                                 printk(" OT %d", forward->id);
1380                                 found = 1;
1381                         }
1382                         break;
1383                 }
1384         }
1385         if (found)
1386                 printk(")");
1387
1388         return 0;
1389 }
1390
1391 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1392         struct uvc_entity **_entity)
1393 {
1394         struct uvc_entity *entity = *_entity;
1395         struct uvc_entity *term;
1396         int id = -EINVAL, i;
1397
1398         switch (UVC_ENTITY_TYPE(entity)) {
1399         case UVC_VC_EXTENSION_UNIT:
1400         case UVC_VC_PROCESSING_UNIT:
1401                 id = entity->baSourceID[0];
1402                 break;
1403
1404         case UVC_VC_SELECTOR_UNIT:
1405                 /* Single-input selector units are ignored. */
1406                 if (entity->bNrInPins == 1) {
1407                         id = entity->baSourceID[0];
1408                         break;
1409                 }
1410
1411                 if (uvc_trace_param & UVC_TRACE_PROBE)
1412                         printk(" <- IT");
1413
1414                 chain->selector = entity;
1415                 for (i = 0; i < entity->bNrInPins; ++i) {
1416                         id = entity->baSourceID[i];
1417                         term = uvc_entity_by_id(chain->dev, id);
1418                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1419                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1420                                         "input %d isn't connected to an "
1421                                         "input terminal\n", entity->id, i);
1422                                 return -1;
1423                         }
1424
1425                         if (uvc_trace_param & UVC_TRACE_PROBE)
1426                                 printk(" %d", term->id);
1427
1428                         list_add_tail(&term->chain, &chain->entities);
1429                         uvc_scan_chain_forward(chain, term, entity);
1430                 }
1431
1432                 if (uvc_trace_param & UVC_TRACE_PROBE)
1433                         printk("\n");
1434
1435                 id = 0;
1436                 break;
1437
1438         case UVC_ITT_VENDOR_SPECIFIC:
1439         case UVC_ITT_CAMERA:
1440         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1441         case UVC_OTT_VENDOR_SPECIFIC:
1442         case UVC_OTT_DISPLAY:
1443         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1444         case UVC_TT_STREAMING:
1445                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1446                 break;
1447         }
1448
1449         if (id <= 0) {
1450                 *_entity = NULL;
1451                 return id;
1452         }
1453
1454         entity = uvc_entity_by_id(chain->dev, id);
1455         if (entity == NULL) {
1456                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1457                         "unknown entity %d.\n", id);
1458                 return -EINVAL;
1459         }
1460
1461         *_entity = entity;
1462         return 0;
1463 }
1464
1465 static int uvc_scan_chain(struct uvc_video_chain *chain,
1466                           struct uvc_entity *term)
1467 {
1468         struct uvc_entity *entity, *prev;
1469
1470         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1471
1472         entity = term;
1473         prev = NULL;
1474
1475         while (entity != NULL) {
1476                 /* Entity must not be part of an existing chain */
1477                 if (entity->chain.next || entity->chain.prev) {
1478                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1479                                 "entity %d already in chain.\n", entity->id);
1480                         return -EINVAL;
1481                 }
1482
1483                 /* Process entity */
1484                 if (uvc_scan_chain_entity(chain, entity) < 0)
1485                         return -EINVAL;
1486
1487                 /* Forward scan */
1488                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1489                         return -EINVAL;
1490
1491                 /* Backward scan */
1492                 prev = entity;
1493                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1494                         return -EINVAL;
1495         }
1496
1497         return 0;
1498 }
1499
1500 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1501                 char *buffer)
1502 {
1503         struct uvc_entity *term;
1504         unsigned int nterms = 0;
1505         char *p = buffer;
1506
1507         list_for_each_entry(term, terms, chain) {
1508                 if (!UVC_ENTITY_IS_TERM(term) ||
1509                     UVC_TERM_DIRECTION(term) != dir)
1510                         continue;
1511
1512                 if (nterms)
1513                         p += sprintf(p, ",");
1514                 if (++nterms >= 4) {
1515                         p += sprintf(p, "...");
1516                         break;
1517                 }
1518                 p += sprintf(p, "%u", term->id);
1519         }
1520
1521         return p - buffer;
1522 }
1523
1524 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1525 {
1526         static char buffer[43];
1527         char *p = buffer;
1528
1529         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1530         p += sprintf(p, " -> ");
1531         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1532
1533         return buffer;
1534 }
1535
1536 /*
1537  * Scan the device for video chains and register video devices.
1538  *
1539  * Chains are scanned starting at their output terminals and walked backwards.
1540  */
1541 static int uvc_scan_device(struct uvc_device *dev)
1542 {
1543         struct uvc_video_chain *chain;
1544         struct uvc_entity *term;
1545
1546         list_for_each_entry(term, &dev->entities, list) {
1547                 if (!UVC_ENTITY_IS_OTERM(term))
1548                         continue;
1549
1550                 /* If the terminal is already included in a chain, skip it.
1551                  * This can happen for chains that have multiple output
1552                  * terminals, where all output terminals beside the first one
1553                  * will be inserted in the chain in forward scans.
1554                  */
1555                 if (term->chain.next || term->chain.prev)
1556                         continue;
1557
1558                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1559                 if (chain == NULL)
1560                         return -ENOMEM;
1561
1562                 INIT_LIST_HEAD(&chain->entities);
1563                 mutex_init(&chain->ctrl_mutex);
1564                 chain->dev = dev;
1565                 v4l2_prio_init(&chain->prio);
1566
1567                 term->flags |= UVC_ENTITY_FLAG_DEFAULT;
1568
1569                 if (uvc_scan_chain(chain, term) < 0) {
1570                         kfree(chain);
1571                         continue;
1572                 }
1573
1574                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1575                           uvc_print_chain(chain));
1576
1577                 list_add_tail(&chain->list, &dev->chains);
1578         }
1579
1580         if (list_empty(&dev->chains)) {
1581                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1582                 return -1;
1583         }
1584
1585         return 0;
1586 }
1587
1588 /* ------------------------------------------------------------------------
1589  * Video device registration and unregistration
1590  */
1591
1592 /*
1593  * Delete the UVC device.
1594  *
1595  * Called by the kernel when the last reference to the uvc_device structure
1596  * is released.
1597  *
1598  * As this function is called after or during disconnect(), all URBs have
1599  * already been canceled by the USB core. There is no need to kill the
1600  * interrupt URB manually.
1601  */
1602 static void uvc_delete(struct uvc_device *dev)
1603 {
1604         struct list_head *p, *n;
1605
1606         usb_put_intf(dev->intf);
1607         usb_put_dev(dev->udev);
1608
1609         uvc_status_cleanup(dev);
1610         uvc_ctrl_cleanup_device(dev);
1611
1612         if (dev->vdev.dev)
1613                 v4l2_device_unregister(&dev->vdev);
1614 #ifdef CONFIG_MEDIA_CONTROLLER
1615         if (media_devnode_is_registered(&dev->mdev.devnode))
1616                 media_device_unregister(&dev->mdev);
1617 #endif
1618
1619         list_for_each_safe(p, n, &dev->chains) {
1620                 struct uvc_video_chain *chain;
1621                 chain = list_entry(p, struct uvc_video_chain, list);
1622                 kfree(chain);
1623         }
1624
1625         list_for_each_safe(p, n, &dev->entities) {
1626                 struct uvc_entity *entity;
1627                 entity = list_entry(p, struct uvc_entity, list);
1628 #ifdef CONFIG_MEDIA_CONTROLLER
1629                 uvc_mc_cleanup_entity(entity);
1630 #endif
1631                 if (entity->vdev) {
1632                         video_device_release(entity->vdev);
1633                         entity->vdev = NULL;
1634                 }
1635                 kfree(entity);
1636         }
1637
1638         list_for_each_safe(p, n, &dev->streams) {
1639                 struct uvc_streaming *streaming;
1640                 streaming = list_entry(p, struct uvc_streaming, list);
1641                 usb_driver_release_interface(&uvc_driver.driver,
1642                         streaming->intf);
1643                 usb_put_intf(streaming->intf);
1644                 kfree(streaming->format);
1645                 kfree(streaming->header.bmaControls);
1646                 kfree(streaming);
1647         }
1648
1649         kfree(dev);
1650 }
1651
1652 static void uvc_release(struct video_device *vdev)
1653 {
1654         struct uvc_streaming *stream = video_get_drvdata(vdev);
1655         struct uvc_device *dev = stream->dev;
1656
1657         /* Decrement the registered streams count and delete the device when it
1658          * reaches zero.
1659          */
1660         if (atomic_dec_and_test(&dev->nstreams))
1661                 uvc_delete(dev);
1662 }
1663
1664 /*
1665  * Unregister the video devices.
1666  */
1667 static void uvc_unregister_video(struct uvc_device *dev)
1668 {
1669         struct uvc_streaming *stream;
1670
1671         /* Unregistering all video devices might result in uvc_delete() being
1672          * called from inside the loop if there's no open file handle. To avoid
1673          * that, increment the stream count before iterating over the streams
1674          * and decrement it when done.
1675          */
1676         atomic_inc(&dev->nstreams);
1677
1678         list_for_each_entry(stream, &dev->streams, list) {
1679                 if (stream->vdev == NULL)
1680                         continue;
1681
1682                 video_unregister_device(stream->vdev);
1683                 stream->vdev = NULL;
1684
1685                 uvc_debugfs_cleanup_stream(stream);
1686         }
1687
1688         /* Decrement the stream count and call uvc_delete explicitly if there
1689          * are no stream left.
1690          */
1691         if (atomic_dec_and_test(&dev->nstreams))
1692                 uvc_delete(dev);
1693 }
1694
1695 static int uvc_register_video(struct uvc_device *dev,
1696                 struct uvc_streaming *stream)
1697 {
1698         struct video_device *vdev;
1699         int ret;
1700
1701         /* Initialize the streaming interface with default streaming
1702          * parameters.
1703          */
1704         ret = uvc_video_init(stream);
1705         if (ret < 0) {
1706                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1707                         "(%d).\n", ret);
1708                 return ret;
1709         }
1710
1711         uvc_debugfs_init_stream(stream);
1712
1713         /* Register the device with V4L. */
1714         vdev = video_device_alloc();
1715         if (vdev == NULL) {
1716                 uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
1717                            ret);
1718                 return -ENOMEM;
1719         }
1720
1721         /* We already hold a reference to dev->udev. The video device will be
1722          * unregistered before the reference is released, so we don't need to
1723          * get another one.
1724          */
1725         vdev->v4l2_dev = &dev->vdev;
1726         vdev->fops = &uvc_fops;
1727         vdev->release = uvc_release;
1728         vdev->prio = &stream->chain->prio;
1729         set_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags);
1730         if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1731                 vdev->vfl_dir = VFL_DIR_TX;
1732         strlcpy(vdev->name, dev->name, sizeof vdev->name);
1733
1734         /* Set the driver data before calling video_register_device, otherwise
1735          * uvc_v4l2_open might race us.
1736          */
1737         stream->vdev = vdev;
1738         video_set_drvdata(vdev, stream);
1739
1740         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1741         if (ret < 0) {
1742                 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1743                            ret);
1744                 stream->vdev = NULL;
1745                 video_device_release(vdev);
1746                 return ret;
1747         }
1748
1749         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1750                 stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE;
1751         else
1752                 stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
1753
1754         atomic_inc(&dev->nstreams);
1755         return 0;
1756 }
1757
1758 /*
1759  * Register all video devices in all chains.
1760  */
1761 static int uvc_register_terms(struct uvc_device *dev,
1762         struct uvc_video_chain *chain)
1763 {
1764         struct uvc_streaming *stream;
1765         struct uvc_entity *term;
1766         int ret;
1767
1768         list_for_each_entry(term, &chain->entities, chain) {
1769                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1770                         continue;
1771
1772                 stream = uvc_stream_by_id(dev, term->id);
1773                 if (stream == NULL) {
1774                         uvc_printk(KERN_INFO, "No streaming interface found "
1775                                    "for terminal %u.", term->id);
1776                         continue;
1777                 }
1778
1779                 stream->chain = chain;
1780                 ret = uvc_register_video(dev, stream);
1781                 if (ret < 0)
1782                         return ret;
1783
1784                 term->vdev = stream->vdev;
1785         }
1786
1787         return 0;
1788 }
1789
1790 static int uvc_register_chains(struct uvc_device *dev)
1791 {
1792         struct uvc_video_chain *chain;
1793         int ret;
1794
1795         list_for_each_entry(chain, &dev->chains, list) {
1796                 ret = uvc_register_terms(dev, chain);
1797                 if (ret < 0)
1798                         return ret;
1799
1800 #ifdef CONFIG_MEDIA_CONTROLLER
1801                 ret = uvc_mc_register_entities(chain);
1802                 if (ret < 0) {
1803                         uvc_printk(KERN_INFO, "Failed to register entites "
1804                                 "(%d).\n", ret);
1805                 }
1806 #endif
1807         }
1808
1809         return 0;
1810 }
1811
1812 /* ------------------------------------------------------------------------
1813  * USB probe, disconnect, suspend and resume
1814  */
1815
1816 static int uvc_probe(struct usb_interface *intf,
1817                      const struct usb_device_id *id)
1818 {
1819         struct usb_device *udev = interface_to_usbdev(intf);
1820         struct uvc_device *dev;
1821         int ret;
1822
1823         if (id->idVendor && id->idProduct)
1824                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1825                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1826                                 id->idProduct);
1827         else
1828                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1829                                 udev->devpath);
1830
1831         /* Allocate memory for the device and initialize it. */
1832         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1833                 return -ENOMEM;
1834
1835         INIT_LIST_HEAD(&dev->entities);
1836         INIT_LIST_HEAD(&dev->chains);
1837         INIT_LIST_HEAD(&dev->streams);
1838         atomic_set(&dev->nstreams, 0);
1839         atomic_set(&dev->nmappings, 0);
1840         mutex_init(&dev->lock);
1841
1842         dev->udev = usb_get_dev(udev);
1843         dev->intf = usb_get_intf(intf);
1844         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1845         dev->quirks = (uvc_quirks_param == -1)
1846                     ? id->driver_info : uvc_quirks_param;
1847
1848         if (udev->product != NULL)
1849                 strlcpy(dev->name, udev->product, sizeof dev->name);
1850         else
1851                 snprintf(dev->name, sizeof dev->name,
1852                         "UVC Camera (%04x:%04x)",
1853                         le16_to_cpu(udev->descriptor.idVendor),
1854                         le16_to_cpu(udev->descriptor.idProduct));
1855
1856         /* Parse the Video Class control descriptor. */
1857         if (uvc_parse_control(dev) < 0) {
1858                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1859                         "descriptors.\n");
1860                 goto error;
1861         }
1862
1863         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
1864                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1865                 udev->product ? udev->product : "<unnamed>",
1866                 le16_to_cpu(udev->descriptor.idVendor),
1867                 le16_to_cpu(udev->descriptor.idProduct));
1868
1869         if (dev->quirks != id->driver_info) {
1870                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
1871                         "parameter for testing purpose.\n", dev->quirks);
1872                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1873                         "linux-uvc-devel mailing list.\n");
1874         }
1875
1876         /* Register the media and V4L2 devices. */
1877 #ifdef CONFIG_MEDIA_CONTROLLER
1878         dev->mdev.dev = &intf->dev;
1879         strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
1880         if (udev->serial)
1881                 strlcpy(dev->mdev.serial, udev->serial,
1882                         sizeof(dev->mdev.serial));
1883         strcpy(dev->mdev.bus_info, udev->devpath);
1884         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
1885         dev->mdev.driver_version = LINUX_VERSION_CODE;
1886         if (media_device_register(&dev->mdev) < 0)
1887                 goto error;
1888
1889         dev->vdev.mdev = &dev->mdev;
1890 #endif
1891         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
1892                 goto error;
1893
1894         /* Initialize controls. */
1895         if (uvc_ctrl_init_device(dev) < 0)
1896                 goto error;
1897
1898         /* Scan the device for video chains. */
1899         if (uvc_scan_device(dev) < 0)
1900                 goto error;
1901
1902         /* Register video device nodes. */
1903         if (uvc_register_chains(dev) < 0)
1904                 goto error;
1905
1906         /* Save our data pointer in the interface data. */
1907         usb_set_intfdata(intf, dev);
1908
1909         /* Initialize the interrupt URB. */
1910         if ((ret = uvc_status_init(dev)) < 0) {
1911                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1912                         "endpoint (%d), status interrupt will not be "
1913                         "supported.\n", ret);
1914         }
1915
1916         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1917         usb_enable_autosuspend(udev);
1918         return 0;
1919
1920 error:
1921         uvc_unregister_video(dev);
1922         return -ENODEV;
1923 }
1924
1925 static void uvc_disconnect(struct usb_interface *intf)
1926 {
1927         struct uvc_device *dev = usb_get_intfdata(intf);
1928
1929         /* Set the USB interface data to NULL. This can be done outside the
1930          * lock, as there's no other reader.
1931          */
1932         usb_set_intfdata(intf, NULL);
1933
1934         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1935             UVC_SC_VIDEOSTREAMING)
1936                 return;
1937
1938         dev->state |= UVC_DEV_DISCONNECTED;
1939
1940         uvc_unregister_video(dev);
1941 }
1942
1943 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1944 {
1945         struct uvc_device *dev = usb_get_intfdata(intf);
1946         struct uvc_streaming *stream;
1947
1948         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1949                 intf->cur_altsetting->desc.bInterfaceNumber);
1950
1951         /* Controls are cached on the fly so they don't need to be saved. */
1952         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1953             UVC_SC_VIDEOCONTROL) {
1954                 mutex_lock(&dev->lock);
1955                 if (dev->users)
1956                         uvc_status_stop(dev);
1957                 mutex_unlock(&dev->lock);
1958                 return 0;
1959         }
1960
1961         list_for_each_entry(stream, &dev->streams, list) {
1962                 if (stream->intf == intf)
1963                         return uvc_video_suspend(stream);
1964         }
1965
1966         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
1967                         "mismatch.\n");
1968         return -EINVAL;
1969 }
1970
1971 static int __uvc_resume(struct usb_interface *intf, int reset)
1972 {
1973         struct uvc_device *dev = usb_get_intfdata(intf);
1974         struct uvc_streaming *stream;
1975
1976         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1977                 intf->cur_altsetting->desc.bInterfaceNumber);
1978
1979         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1980             UVC_SC_VIDEOCONTROL) {
1981                 int ret = 0;
1982
1983                 if (reset) {
1984                         ret = uvc_ctrl_resume_device(dev);
1985                         if (ret < 0)
1986                                 return ret;
1987                 }
1988
1989                 mutex_lock(&dev->lock);
1990                 if (dev->users)
1991                         ret = uvc_status_start(dev, GFP_NOIO);
1992                 mutex_unlock(&dev->lock);
1993
1994                 return ret;
1995         }
1996
1997         list_for_each_entry(stream, &dev->streams, list) {
1998                 if (stream->intf == intf)
1999                         return uvc_video_resume(stream, reset);
2000         }
2001
2002         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
2003                         "mismatch.\n");
2004         return -EINVAL;
2005 }
2006
2007 static int uvc_resume(struct usb_interface *intf)
2008 {
2009         return __uvc_resume(intf, 0);
2010 }
2011
2012 static int uvc_reset_resume(struct usb_interface *intf)
2013 {
2014         return __uvc_resume(intf, 1);
2015 }
2016
2017 /* ------------------------------------------------------------------------
2018  * Module parameters
2019  */
2020
2021 static int uvc_clock_param_get(char *buffer, struct kernel_param *kp)
2022 {
2023         if (uvc_clock_param == CLOCK_MONOTONIC)
2024                 return sprintf(buffer, "CLOCK_MONOTONIC");
2025         else
2026                 return sprintf(buffer, "CLOCK_REALTIME");
2027 }
2028
2029 static int uvc_clock_param_set(const char *val, struct kernel_param *kp)
2030 {
2031         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2032                 val += strlen("clock_");
2033
2034         if (strcasecmp(val, "monotonic") == 0)
2035                 uvc_clock_param = CLOCK_MONOTONIC;
2036         else if (strcasecmp(val, "realtime") == 0)
2037                 uvc_clock_param = CLOCK_REALTIME;
2038         else
2039                 return -EINVAL;
2040
2041         return 0;
2042 }
2043
2044 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2045                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2046 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2047 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2048 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2049 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2050 MODULE_PARM_DESC(quirks, "Forced device quirks");
2051 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2052 MODULE_PARM_DESC(trace, "Trace level bitmask");
2053 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2054 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2055
2056 /* ------------------------------------------------------------------------
2057  * Driver initialization and cleanup
2058  */
2059
2060 /*
2061  * The Logitech cameras listed below have their interface class set to
2062  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2063  * though they are compliant.
2064  */
2065 static struct usb_device_id uvc_ids[] = {
2066         /* LogiLink Wireless Webcam */
2067         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2068                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2069           .idVendor             = 0x0416,
2070           .idProduct            = 0xa91a,
2071           .bInterfaceClass      = USB_CLASS_VIDEO,
2072           .bInterfaceSubClass   = 1,
2073           .bInterfaceProtocol   = 0,
2074           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2075         /* Genius eFace 2025 */
2076         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2077                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2078           .idVendor             = 0x0458,
2079           .idProduct            = 0x706e,
2080           .bInterfaceClass      = USB_CLASS_VIDEO,
2081           .bInterfaceSubClass   = 1,
2082           .bInterfaceProtocol   = 0,
2083           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2084         /* Microsoft Lifecam NX-6000 */
2085         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2086                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2087           .idVendor             = 0x045e,
2088           .idProduct            = 0x00f8,
2089           .bInterfaceClass      = USB_CLASS_VIDEO,
2090           .bInterfaceSubClass   = 1,
2091           .bInterfaceProtocol   = 0,
2092           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2093         /* Microsoft Lifecam VX-7000 */
2094         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2095                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2096           .idVendor             = 0x045e,
2097           .idProduct            = 0x0723,
2098           .bInterfaceClass      = USB_CLASS_VIDEO,
2099           .bInterfaceSubClass   = 1,
2100           .bInterfaceProtocol   = 0,
2101           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2102         /* Logitech Quickcam Fusion */
2103         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2104                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2105           .idVendor             = 0x046d,
2106           .idProduct            = 0x08c1,
2107           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2108           .bInterfaceSubClass   = 1,
2109           .bInterfaceProtocol   = 0 },
2110         /* Logitech Quickcam Orbit MP */
2111         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2112                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2113           .idVendor             = 0x046d,
2114           .idProduct            = 0x08c2,
2115           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2116           .bInterfaceSubClass   = 1,
2117           .bInterfaceProtocol   = 0 },
2118         /* Logitech Quickcam Pro for Notebook */
2119         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2120                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2121           .idVendor             = 0x046d,
2122           .idProduct            = 0x08c3,
2123           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2124           .bInterfaceSubClass   = 1,
2125           .bInterfaceProtocol   = 0 },
2126         /* Logitech Quickcam Pro 5000 */
2127         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2128                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2129           .idVendor             = 0x046d,
2130           .idProduct            = 0x08c5,
2131           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2132           .bInterfaceSubClass   = 1,
2133           .bInterfaceProtocol   = 0 },
2134         /* Logitech Quickcam OEM Dell Notebook */
2135         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2136                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2137           .idVendor             = 0x046d,
2138           .idProduct            = 0x08c6,
2139           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2140           .bInterfaceSubClass   = 1,
2141           .bInterfaceProtocol   = 0 },
2142         /* Logitech Quickcam OEM Cisco VT Camera II */
2143         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2144                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2145           .idVendor             = 0x046d,
2146           .idProduct            = 0x08c7,
2147           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2148           .bInterfaceSubClass   = 1,
2149           .bInterfaceProtocol   = 0 },
2150         /* Chicony CNF7129 (Asus EEE 100HE) */
2151         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2152                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2153           .idVendor             = 0x04f2,
2154           .idProduct            = 0xb071,
2155           .bInterfaceClass      = USB_CLASS_VIDEO,
2156           .bInterfaceSubClass   = 1,
2157           .bInterfaceProtocol   = 0,
2158           .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
2159         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2160         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2161                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2162           .idVendor             = 0x058f,
2163           .idProduct            = 0x3820,
2164           .bInterfaceClass      = USB_CLASS_VIDEO,
2165           .bInterfaceSubClass   = 1,
2166           .bInterfaceProtocol   = 0,
2167           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2168         /* Dell XPS m1530 */
2169         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2170                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2171           .idVendor             = 0x05a9,
2172           .idProduct            = 0x2640,
2173           .bInterfaceClass      = USB_CLASS_VIDEO,
2174           .bInterfaceSubClass   = 1,
2175           .bInterfaceProtocol   = 0,
2176           .driver_info          = UVC_QUIRK_PROBE_DEF },
2177         /* Dell Alienware X51 */
2178         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2179                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2180           .idVendor             = 0x05a9,
2181           .idProduct            = 0x2643,
2182           .bInterfaceClass      = USB_CLASS_VIDEO,
2183           .bInterfaceSubClass   = 1,
2184           .bInterfaceProtocol   = 0,
2185           .driver_info  = UVC_QUIRK_PROBE_DEF },
2186         /* Dell Studio Hybrid 140g (OmniVision webcam) */
2187         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2188                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2189           .idVendor             = 0x05a9,
2190           .idProduct            = 0x264a,
2191           .bInterfaceClass      = USB_CLASS_VIDEO,
2192           .bInterfaceSubClass   = 1,
2193           .bInterfaceProtocol   = 0,
2194           .driver_info          = UVC_QUIRK_PROBE_DEF },
2195         /* Apple Built-In iSight */
2196         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2197                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2198           .idVendor             = 0x05ac,
2199           .idProduct            = 0x8501,
2200           .bInterfaceClass      = USB_CLASS_VIDEO,
2201           .bInterfaceSubClass   = 1,
2202           .bInterfaceProtocol   = 0,
2203           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2204                                 | UVC_QUIRK_BUILTIN_ISIGHT },
2205         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2206         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2207                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2208           .idVendor             = 0x05c8,
2209           .idProduct            = 0x0403,
2210           .bInterfaceClass      = USB_CLASS_VIDEO,
2211           .bInterfaceSubClass   = 1,
2212           .bInterfaceProtocol   = 0,
2213           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2214         /* Genesys Logic USB 2.0 PC Camera */
2215         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2216                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2217           .idVendor             = 0x05e3,
2218           .idProduct            = 0x0505,
2219           .bInterfaceClass      = USB_CLASS_VIDEO,
2220           .bInterfaceSubClass   = 1,
2221           .bInterfaceProtocol   = 0,
2222           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2223         /* Hercules Classic Silver */
2224         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2225                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2226           .idVendor             = 0x06f8,
2227           .idProduct            = 0x300c,
2228           .bInterfaceClass      = USB_CLASS_VIDEO,
2229           .bInterfaceSubClass   = 1,
2230           .bInterfaceProtocol   = 0,
2231           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2232         /* ViMicro Vega */
2233         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2234                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2235           .idVendor             = 0x0ac8,
2236           .idProduct            = 0x332d,
2237           .bInterfaceClass      = USB_CLASS_VIDEO,
2238           .bInterfaceSubClass   = 1,
2239           .bInterfaceProtocol   = 0,
2240           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2241         /* ViMicro - Minoru3D */
2242         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2243                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2244           .idVendor             = 0x0ac8,
2245           .idProduct            = 0x3410,
2246           .bInterfaceClass      = USB_CLASS_VIDEO,
2247           .bInterfaceSubClass   = 1,
2248           .bInterfaceProtocol   = 0,
2249           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2250         /* ViMicro Venus - Minoru3D */
2251         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2252                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2253           .idVendor             = 0x0ac8,
2254           .idProduct            = 0x3420,
2255           .bInterfaceClass      = USB_CLASS_VIDEO,
2256           .bInterfaceSubClass   = 1,
2257           .bInterfaceProtocol   = 0,
2258           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2259         /* Ophir Optronics - SPCAM 620U */
2260         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2261                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2262           .idVendor             = 0x0bd3,
2263           .idProduct            = 0x0555,
2264           .bInterfaceClass      = USB_CLASS_VIDEO,
2265           .bInterfaceSubClass   = 1,
2266           .bInterfaceProtocol   = 0,
2267           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2268         /* MT6227 */
2269         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2270                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2271           .idVendor             = 0x0e8d,
2272           .idProduct            = 0x0004,
2273           .bInterfaceClass      = USB_CLASS_VIDEO,
2274           .bInterfaceSubClass   = 1,
2275           .bInterfaceProtocol   = 0,
2276           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2277                                 | UVC_QUIRK_PROBE_DEF },
2278         /* IMC Networks (Medion Akoya) */
2279         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2280                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2281           .idVendor             = 0x13d3,
2282           .idProduct            = 0x5103,
2283           .bInterfaceClass      = USB_CLASS_VIDEO,
2284           .bInterfaceSubClass   = 1,
2285           .bInterfaceProtocol   = 0,
2286           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2287         /* JMicron USB2.0 XGA WebCam */
2288         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2289                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2290           .idVendor             = 0x152d,
2291           .idProduct            = 0x0310,
2292           .bInterfaceClass      = USB_CLASS_VIDEO,
2293           .bInterfaceSubClass   = 1,
2294           .bInterfaceProtocol   = 0,
2295           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2296         /* Syntek (HP Spartan) */
2297         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2298                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2299           .idVendor             = 0x174f,
2300           .idProduct            = 0x5212,
2301           .bInterfaceClass      = USB_CLASS_VIDEO,
2302           .bInterfaceSubClass   = 1,
2303           .bInterfaceProtocol   = 0,
2304           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2305         /* Syntek (Samsung Q310) */
2306         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2307                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2308           .idVendor             = 0x174f,
2309           .idProduct            = 0x5931,
2310           .bInterfaceClass      = USB_CLASS_VIDEO,
2311           .bInterfaceSubClass   = 1,
2312           .bInterfaceProtocol   = 0,
2313           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2314         /* Syntek (Packard Bell EasyNote MX52 */
2315         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2316                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2317           .idVendor             = 0x174f,
2318           .idProduct            = 0x8a12,
2319           .bInterfaceClass      = USB_CLASS_VIDEO,
2320           .bInterfaceSubClass   = 1,
2321           .bInterfaceProtocol   = 0,
2322           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2323         /* Syntek (Asus F9SG) */
2324         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2325                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2326           .idVendor             = 0x174f,
2327           .idProduct            = 0x8a31,
2328           .bInterfaceClass      = USB_CLASS_VIDEO,
2329           .bInterfaceSubClass   = 1,
2330           .bInterfaceProtocol   = 0,
2331           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2332         /* Syntek (Asus U3S) */
2333         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2334                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2335           .idVendor             = 0x174f,
2336           .idProduct            = 0x8a33,
2337           .bInterfaceClass      = USB_CLASS_VIDEO,
2338           .bInterfaceSubClass   = 1,
2339           .bInterfaceProtocol   = 0,
2340           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2341         /* Syntek (JAOtech Smart Terminal) */
2342         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2343                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2344           .idVendor             = 0x174f,
2345           .idProduct            = 0x8a34,
2346           .bInterfaceClass      = USB_CLASS_VIDEO,
2347           .bInterfaceSubClass   = 1,
2348           .bInterfaceProtocol   = 0,
2349           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2350         /* Miricle 307K */
2351         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2352                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2353           .idVendor             = 0x17dc,
2354           .idProduct            = 0x0202,
2355           .bInterfaceClass      = USB_CLASS_VIDEO,
2356           .bInterfaceSubClass   = 1,
2357           .bInterfaceProtocol   = 0,
2358           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2359         /* Lenovo Thinkpad SL400/SL500 */
2360         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2361                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2362           .idVendor             = 0x17ef,
2363           .idProduct            = 0x480b,
2364           .bInterfaceClass      = USB_CLASS_VIDEO,
2365           .bInterfaceSubClass   = 1,
2366           .bInterfaceProtocol   = 0,
2367           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2368         /* Aveo Technology USB 2.0 Camera */
2369         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2370                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2371           .idVendor             = 0x1871,
2372           .idProduct            = 0x0306,
2373           .bInterfaceClass      = USB_CLASS_VIDEO,
2374           .bInterfaceSubClass   = 1,
2375           .bInterfaceProtocol   = 0,
2376           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2377                                 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2378         /* Ecamm Pico iMage */
2379         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2380                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2381           .idVendor             = 0x18cd,
2382           .idProduct            = 0xcafe,
2383           .bInterfaceClass      = USB_CLASS_VIDEO,
2384           .bInterfaceSubClass   = 1,
2385           .bInterfaceProtocol   = 0,
2386           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
2387         /* Manta MM-353 Plako */
2388         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2389                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2390           .idVendor             = 0x18ec,
2391           .idProduct            = 0x3188,
2392           .bInterfaceClass      = USB_CLASS_VIDEO,
2393           .bInterfaceSubClass   = 1,
2394           .bInterfaceProtocol   = 0,
2395           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2396         /* FSC WebCam V30S */
2397         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2398                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2399           .idVendor             = 0x18ec,
2400           .idProduct            = 0x3288,
2401           .bInterfaceClass      = USB_CLASS_VIDEO,
2402           .bInterfaceSubClass   = 1,
2403           .bInterfaceProtocol   = 0,
2404           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2405         /* Arkmicro unbranded */
2406         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2407                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2408           .idVendor             = 0x18ec,
2409           .idProduct            = 0x3290,
2410           .bInterfaceClass      = USB_CLASS_VIDEO,
2411           .bInterfaceSubClass   = 1,
2412           .bInterfaceProtocol   = 0,
2413           .driver_info          = UVC_QUIRK_PROBE_DEF },
2414         /* The Imaging Source USB CCD cameras */
2415         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2416                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2417           .idVendor             = 0x199e,
2418           .idProduct            = 0x8102,
2419           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2420           .bInterfaceSubClass   = 1,
2421           .bInterfaceProtocol   = 0 },
2422         /* Bodelin ProScopeHR */
2423         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2424                                 | USB_DEVICE_ID_MATCH_DEV_HI
2425                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2426           .idVendor             = 0x19ab,
2427           .idProduct            = 0x1000,
2428           .bcdDevice_hi         = 0x0126,
2429           .bInterfaceClass      = USB_CLASS_VIDEO,
2430           .bInterfaceSubClass   = 1,
2431           .bInterfaceProtocol   = 0,
2432           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
2433         /* MSI StarCam 370i */
2434         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2435                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2436           .idVendor             = 0x1b3b,
2437           .idProduct            = 0x2951,
2438           .bInterfaceClass      = USB_CLASS_VIDEO,
2439           .bInterfaceSubClass   = 1,
2440           .bInterfaceProtocol   = 0,
2441           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2442         /* SiGma Micro USB Web Camera */
2443         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2444                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2445           .idVendor             = 0x1c4f,
2446           .idProduct            = 0x3000,
2447           .bInterfaceClass      = USB_CLASS_VIDEO,
2448           .bInterfaceSubClass   = 1,
2449           .bInterfaceProtocol   = 0,
2450           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2451                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2452         /* Generic USB Video Class */
2453         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
2454         {}
2455 };
2456
2457 MODULE_DEVICE_TABLE(usb, uvc_ids);
2458
2459 struct uvc_driver uvc_driver = {
2460         .driver = {
2461                 .name           = "uvcvideo",
2462                 .probe          = uvc_probe,
2463                 .disconnect     = uvc_disconnect,
2464                 .suspend        = uvc_suspend,
2465                 .resume         = uvc_resume,
2466                 .reset_resume   = uvc_reset_resume,
2467                 .id_table       = uvc_ids,
2468                 .supports_autosuspend = 1,
2469         },
2470 };
2471
2472 static int __init uvc_init(void)
2473 {
2474         int ret;
2475
2476         uvc_debugfs_init();
2477
2478         ret = usb_register(&uvc_driver.driver);
2479         if (ret < 0) {
2480                 uvc_debugfs_cleanup();
2481                 return ret;
2482         }
2483
2484         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2485         return 0;
2486 }
2487
2488 static void __exit uvc_cleanup(void)
2489 {
2490         usb_deregister(&uvc_driver.driver);
2491         uvc_debugfs_cleanup();
2492 }
2493
2494 module_init(uvc_init);
2495 module_exit(uvc_cleanup);
2496
2497 MODULE_AUTHOR(DRIVER_AUTHOR);
2498 MODULE_DESCRIPTION(DRIVER_DESC);
2499 MODULE_LICENSE("GPL");
2500 MODULE_VERSION(DRIVER_VERSION);
2501