drivers/media/video/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 /*
  15  * This driver aims to support video input and ouput devices compliant with the
  16  * 'USB Video Class' specification.
  17  *
  18  * The driver doesn't support the deprecated v4l1 interface. It implements the
  19  * mmap capture method only, and doesn't do any image format conversion in
  20  * software. If your user-space application doesn't support YUYV or MJPEG, fix
  21  * it :-). Please note that the MJPEG data have been stripped from their
  22  * Huffman tables (DHT marker), you will need to add it back if your JPEG
  23  * codec can't handle MJPEG data.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/list.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/usb.h>
  31 #include <linux/videodev2.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/wait.h>
  34 #include <linux/version.h>
  35 #include <asm/atomic.h>
  36 #include <asm/unaligned.h>
  37
  38 #include <media/v4l2-common.h>
  39
  40 #include "uvcvideo.h"
  41
  42 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  43                                 "<laurent.pinchart@ideasonboard.com>"
  44 #define DRIVER_DESC             "USB Video Class driver"
  45
  46 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  47 unsigned int uvc_no_drop_param;
  48 static unsigned int uvc_quirks_param = -1;
  49 unsigned int uvc_trace_param;
  50 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  51
  52 /* ------------------------------------------------------------------------
  53  * Video formats
  54  */
  55
  56 static struct uvc_format_desc uvc_fmts[] = {
  57         {
  58                 .name           = "YUV 4:2:2 (YUYV)",
  59                 .guid           = UVC_GUID_FORMAT_YUY2,
  60                 .fcc            = V4L2_PIX_FMT_YUYV,
  61         },
  62         {
  63                 .name           = "YUV 4:2:2 (YUYV)",
  64                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  65                 .fcc            = V4L2_PIX_FMT_YUYV,
  66         },
  67         {
  68                 .name           = "YUV 4:2:0 (NV12)",
  69                 .guid           = UVC_GUID_FORMAT_NV12,
  70                 .fcc            = V4L2_PIX_FMT_NV12,
  71         },
  72         {
  73                 .name           = "MJPEG",
  74                 .guid           = UVC_GUID_FORMAT_MJPEG,
  75                 .fcc            = V4L2_PIX_FMT_MJPEG,
  76         },
  77         {
  78                 .name           = "YVU 4:2:0 (YV12)",
  79                 .guid           = UVC_GUID_FORMAT_YV12,
  80                 .fcc            = V4L2_PIX_FMT_YVU420,
  81         },
  82         {
  83                 .name           = "YUV 4:2:0 (I420)",
  84                 .guid           = UVC_GUID_FORMAT_I420,
  85                 .fcc            = V4L2_PIX_FMT_YUV420,
  86         },
  87         {
  88                 .name           = "YUV 4:2:0 (M420)",
  89                 .guid           = UVC_GUID_FORMAT_M420,
  90                 .fcc            = V4L2_PIX_FMT_M420,
  91         },
  92         {
  93                 .name           = "YUV 4:2:2 (UYVY)",
  94                 .guid           = UVC_GUID_FORMAT_UYVY,
  95                 .fcc            = V4L2_PIX_FMT_UYVY,
  96         },
  97         {
  98                 .name           = "Greyscale (8-bit)",
  99                 .guid           = UVC_GUID_FORMAT_Y800,
 100                 .fcc            = V4L2_PIX_FMT_GREY,
 101         },
 102         {
 103                 .name           = "Greyscale (16-bit)",
 104                 .guid           = UVC_GUID_FORMAT_Y16,
 105                 .fcc            = V4L2_PIX_FMT_Y16,
 106         },
 107         {
 108                 .name           = "RGB Bayer",
 109                 .guid           = UVC_GUID_FORMAT_BY8,
 110                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 111         },
 112         {
 113                 .name           = "RGB565",
 114                 .guid           = UVC_GUID_FORMAT_RGBP,
 115                 .fcc            = V4L2_PIX_FMT_RGB565,
 116         },
 117         {
 118                 .name           = "H.264",
 119                 .guid           = UVC_GUID_FORMAT_H264,
 120                 .fcc            = V4L2_PIX_FMT_H264,
 121         },
 122 };
 123
 124 /* ------------------------------------------------------------------------
 125  * Utility functions
 126  */
 127
 128 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 129                 __u8 epaddr)
 130 {
 131         struct usb_host_endpoint *ep;
 132         unsigned int i;
 133
 134         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 135                 ep = &alts->endpoint[i];
 136                 if (ep->desc.bEndpointAddress == epaddr)
 137                         return ep;
 138         }
 139
 140         return NULL;
 141 }
 142
 143 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 144 {
 145         unsigned int len = ARRAY_SIZE(uvc_fmts);
 146         unsigned int i;
 147
 148         for (i = 0; i < len; ++i) {
 149                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 150                         return &uvc_fmts[i];
 151         }
 152
 153         return NULL;
 154 }
 155
 156 static __u32 uvc_colorspace(const __u8 primaries)
 157 {
 158         static const __u8 colorprimaries[] = {
 159                 0,
 160                 V4L2_COLORSPACE_SRGB,
 161                 V4L2_COLORSPACE_470_SYSTEM_M,
 162                 V4L2_COLORSPACE_470_SYSTEM_BG,
 163                 V4L2_COLORSPACE_SMPTE170M,
 164                 V4L2_COLORSPACE_SMPTE240M,
 165         };
 166
 167         if (primaries < ARRAY_SIZE(colorprimaries))
 168                 return colorprimaries[primaries];
 169
 170         return 0;
 171 }
 172
 173 /* Simplify a fraction using a simple continued fraction decomposition. The
 174  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 175  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 176  * arbitrary parameters to remove non-significative terms from the simple
 177  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 178  * respectively seems to give nice results.
 179  */
 180 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 181                 unsigned int n_terms, unsigned int threshold)
 182 {
 183         uint32_t *an;
 184         uint32_t x, y, r;
 185         unsigned int i, n;
 186
 187         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 188         if (an == NULL)
 189                 return;
 190
 191         /* Convert the fraction to a simple continued fraction. See
 192          * http://mathforum.org/dr.math/faq/faq.fractions.html
 193          * Stop if the current term is bigger than or equal to the given
 194          * threshold.
 195          */
 196         x = *numerator;
 197         y = *denominator;
 198
 199         for (n = 0; n < n_terms && y != 0; ++n) {
 200                 an[n] = x / y;
 201                 if (an[n] >= threshold) {
 202                         if (n < 2)
 203                                 n++;
 204                         break;
 205                 }
 206
 207                 r = x - an[n] * y;
 208                 x = y;
 209                 y = r;
 210         }
 211
 212         /* Expand the simple continued fraction back to an integer fraction. */
 213         x = 0;
 214         y = 1;
 215
 216         for (i = n; i > 0; --i) {
 217                 r = y;
 218                 y = an[i-1] * y + x;
 219                 x = r;
 220         }
 221
 222         *numerator = y;
 223         *denominator = x;
 224         kfree(an);
 225 }
 226
 227 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 228  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 229  * arithmetic only.
 230  */
 231 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 232 {
 233         uint32_t multiplier;
 234
 235         /* Saturate the result if the operation would overflow. */
 236         if (denominator == 0 ||
 237             numerator/denominator >= ((uint32_t)-1)/10000000)
 238                 return (uint32_t)-1;
 239
 240         /* Divide both the denominator and the multiplier by two until
 241          * numerator * multiplier doesn't overflow. If anyone knows a better
 242          * algorithm please let me know.
 243          */
 244         multiplier = 10000000;
 245         while (numerator > ((uint32_t)-1)/multiplier) {
 246                 multiplier /= 2;
 247                 denominator /= 2;
 248         }
 249
 250         return denominator ? numerator * multiplier / denominator : 0;
 251 }
 252
 253 /* ------------------------------------------------------------------------
 254  * Terminal and unit management
 255  */
 256
 257 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 258 {
 259         struct uvc_entity *entity;
 260
 261         list_for_each_entry(entity, &dev->entities, list) {
 262                 if (entity->id == id)
 263                         return entity;
 264         }
 265
 266         return NULL;
 267 }
 268
 269 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 270         int id, struct uvc_entity *entity)
 271 {
 272         unsigned int i;
 273
 274         if (entity == NULL)
 275                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 276
 277         list_for_each_entry_continue(entity, &dev->entities, list) {
 278                 for (i = 0; i < entity->bNrInPins; ++i)
 279                         if (entity->baSourceID[i] == id)
 280                                 return entity;
 281         }
 282
 283         return NULL;
 284 }
 285
 286 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 287 {
 288         struct uvc_streaming *stream;
 289
 290         list_for_each_entry(stream, &dev->streams, list) {
 291                 if (stream->header.bTerminalLink == id)
 292                         return stream;
 293         }
 294
 295         return NULL;
 296 }
 297
 298 /* ------------------------------------------------------------------------
 299  * Descriptors parsing
 300  */
 301
 302 static int uvc_parse_format(struct uvc_device *dev,
 303         struct uvc_streaming *streaming, struct uvc_format *format,
 304         __u32 **intervals, unsigned char *buffer, int buflen)
 305 {
 306         struct usb_interface *intf = streaming->intf;
 307         struct usb_host_interface *alts = intf->cur_altsetting;
 308         struct uvc_format_desc *fmtdesc;
 309         struct uvc_frame *frame;
 310         const unsigned char *start = buffer;
 311         unsigned int interval;
 312         unsigned int i, n;
 313         __u8 ftype;
 314
 315         format->type = buffer[2];
 316         format->index = buffer[3];
 317
 318         switch (buffer[2]) {
 319         case UVC_VS_FORMAT_UNCOMPRESSED:
 320         case UVC_VS_FORMAT_FRAME_BASED:
 321                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 322                 if (buflen < n) {
 323                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 324                                "interface %d FORMAT error\n",
 325                                dev->udev->devnum,
 326                                alts->desc.bInterfaceNumber);
 327                         return -EINVAL;
 328                 }
 329
 330                 /* Find the format descriptor from its GUID. */
 331                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 332
 333                 if (fmtdesc != NULL) {
 334                         strlcpy(format->name, fmtdesc->name,
 335                                 sizeof format->name);
 336                         format->fcc = fmtdesc->fcc;
 337                 } else {
 338                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 339                                 &buffer[5]);
 340                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 341                                 &buffer[5]);
 342                         format->fcc = 0;
 343                 }
 344
 345                 format->bpp = buffer[21];
 346                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 347                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 348                 } else {
 349                         ftype = UVC_VS_FRAME_FRAME_BASED;
 350                         if (buffer[27])
 351                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 352                 }
 353                 break;
 354
 355         case UVC_VS_FORMAT_MJPEG:
 356                 if (buflen < 11) {
 357                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 358                                "interface %d FORMAT error\n",
 359                                dev->udev->devnum,
 360                                alts->desc.bInterfaceNumber);
 361                         return -EINVAL;
 362                 }
 363
 364                 strlcpy(format->name, "MJPEG", sizeof format->name);
 365                 format->fcc = V4L2_PIX_FMT_MJPEG;
 366                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 367                 format->bpp = 0;
 368                 ftype = UVC_VS_FRAME_MJPEG;
 369                 break;
 370
 371         case UVC_VS_FORMAT_DV:
 372                 if (buflen < 9) {
 373                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 374                                "interface %d FORMAT error\n",
 375                                dev->udev->devnum,
 376                                alts->desc.bInterfaceNumber);
 377                         return -EINVAL;
 378                 }
 379
 380                 switch (buffer[8] & 0x7f) {
 381                 case 0:
 382                         strlcpy(format->name, "SD-DV", sizeof format->name);
 383                         break;
 384                 case 1:
 385                         strlcpy(format->name, "SDL-DV", sizeof format->name);
 386                         break;
 387                 case 2:
 388                         strlcpy(format->name, "HD-DV", sizeof format->name);
 389                         break;
 390                 default:
 391                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 392                                "interface %d: unknown DV format %u\n",
 393                                dev->udev->devnum,
 394                                alts->desc.bInterfaceNumber, buffer[8]);
 395                         return -EINVAL;
 396                 }
 397
 398                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 399                         sizeof format->name);
 400
 401                 format->fcc = V4L2_PIX_FMT_DV;
 402                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 403                 format->bpp = 0;
 404                 ftype = 0;
 405
 406                 /* Create a dummy frame descriptor. */
 407                 frame = &format->frame[0];
 408                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 409                 frame->bFrameIntervalType = 1;
 410                 frame->dwDefaultFrameInterval = 1;
 411                 frame->dwFrameInterval = *intervals;
 412                 *(*intervals)++ = 1;
 413                 format->nframes = 1;
 414                 break;
 415
 416         case UVC_VS_FORMAT_MPEG2TS:
 417         case UVC_VS_FORMAT_STREAM_BASED:
 418                 /* Not supported yet. */
 419         default:
 420                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 421                        "interface %d unsupported format %u\n",
 422                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 423                        buffer[2]);
 424                 return -EINVAL;
 425         }
 426
 427         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 428
 429         buflen -= buffer[0];
 430         buffer += buffer[0];
 431
 432         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 433          * based formats have frame descriptors.
 434          */
 435         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 436                buffer[2] == ftype) {
 437                 frame = &format->frame[format->nframes];
 438                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 439                         n = buflen > 25 ? buffer[25] : 0;
 440                 else
 441                         n = buflen > 21 ? buffer[21] : 0;
 442
 443                 n = n ? n : 3;
 444
 445                 if (buflen < 26 + 4*n) {
 446                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 447                                "interface %d FRAME error\n", dev->udev->devnum,
 448                                alts->desc.bInterfaceNumber);
 449                         return -EINVAL;
 450                 }
 451
 452                 frame->bFrameIndex = buffer[3];
 453                 frame->bmCapabilities = buffer[4];
 454                 frame->wWidth = get_unaligned_le16(&buffer[5]);
 455                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 456                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 457                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 458                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 459                         frame->dwMaxVideoFrameBufferSize =
 460                                 get_unaligned_le32(&buffer[17]);
 461                         frame->dwDefaultFrameInterval =
 462                                 get_unaligned_le32(&buffer[21]);
 463                         frame->bFrameIntervalType = buffer[25];
 464                 } else {
 465                         frame->dwMaxVideoFrameBufferSize = 0;
 466                         frame->dwDefaultFrameInterval =
 467                                 get_unaligned_le32(&buffer[17]);
 468                         frame->bFrameIntervalType = buffer[21];
 469                 }
 470                 frame->dwFrameInterval = *intervals;
 471
 472                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 473                  * completely. Observed behaviours range from setting the
 474                  * value to 1.1x the actual frame size to hardwiring the
 475                  * 16 low bits to 0. This results in a higher than necessary
 476                  * memory usage as well as a wrong image size information. For
 477                  * uncompressed formats this can be fixed by computing the
 478                  * value from the frame size.
 479                  */
 480                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 481                         frame->dwMaxVideoFrameBufferSize = format->bpp
 482                                 * frame->wWidth * frame->wHeight / 8;
 483
 484                 /* Some bogus devices report dwMinFrameInterval equal to
 485                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 486                  * zero. Setting all null intervals to 1 fixes the problem and
 487                  * some other divisions by zero that could happen.
 488                  */
 489                 for (i = 0; i < n; ++i) {
 490                         interval = get_unaligned_le32(&buffer[26+4*i]);
 491                         *(*intervals)++ = interval ? interval : 1;
 492                 }
 493
 494                 /* Make sure that the default frame interval stays between
 495                  * the boundaries.
 496                  */
 497                 n -= frame->bFrameIntervalType ? 1 : 2;
 498                 frame->dwDefaultFrameInterval =
 499                         min(frame->dwFrameInterval[n],
 500                             max(frame->dwFrameInterval[0],
 501                                 frame->dwDefaultFrameInterval));
 502
 503                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 504                         frame->bFrameIntervalType = 1;
 505                         frame->dwFrameInterval[0] =
 506                                 frame->dwDefaultFrameInterval;
 507                 }
 508
 509                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 510                         frame->wWidth, frame->wHeight,
 511                         10000000/frame->dwDefaultFrameInterval,
 512                         (100000000/frame->dwDefaultFrameInterval)%10);
 513
 514                 format->nframes++;
 515                 buflen -= buffer[0];
 516                 buffer += buffer[0];
 517         }
 518
 519         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 520             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 521                 buflen -= buffer[0];
 522                 buffer += buffer[0];
 523         }
 524
 525         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 526             buffer[2] == UVC_VS_COLORFORMAT) {
 527                 if (buflen < 6) {
 528                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 529                                "interface %d COLORFORMAT error\n",
 530                                dev->udev->devnum,
 531                                alts->desc.bInterfaceNumber);
 532                         return -EINVAL;
 533                 }
 534
 535                 format->colorspace = uvc_colorspace(buffer[3]);
 536
 537                 buflen -= buffer[0];
 538                 buffer += buffer[0];
 539         }
 540
 541         return buffer - start;
 542 }
 543
 544 static int uvc_parse_streaming(struct uvc_device *dev,
 545         struct usb_interface *intf)
 546 {
 547         struct uvc_streaming *streaming = NULL;
 548         struct uvc_format *format;
 549         struct uvc_frame *frame;
 550         struct usb_host_interface *alts = &intf->altsetting[0];
 551         unsigned char *_buffer, *buffer = alts->extra;
 552         int _buflen, buflen = alts->extralen;
 553         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 554         unsigned int size, i, n, p;
 555         __u32 *interval;
 556         __u16 psize;
 557         int ret = -EINVAL;
 558
 559         if (intf->cur_altsetting->desc.bInterfaceSubClass
 560                 != UVC_SC_VIDEOSTREAMING) {
 561                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 562                         "video streaming interface\n", dev->udev->devnum,
 563                         intf->altsetting[0].desc.bInterfaceNumber);
 564                 return -EINVAL;
 565         }
 566
 567         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 568                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 569                         "claimed\n", dev->udev->devnum,
 570                         intf->altsetting[0].desc.bInterfaceNumber);
 571                 return -EINVAL;
 572         }
 573
 574         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 575         if (streaming == NULL) {
 576                 usb_driver_release_interface(&uvc_driver.driver, intf);
 577                 return -EINVAL;
 578         }
 579
 580         mutex_init(&streaming->mutex);
 581         streaming->dev = dev;
 582         streaming->intf = usb_get_intf(intf);
 583         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 584
 585         /* The Pico iMage webcam has its class-specific interface descriptors
 586          * after the endpoint descriptors.
 587          */
 588         if (buflen == 0) {
 589                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 590                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 591
 592                         if (ep->extralen == 0)
 593                                 continue;
 594
 595                         if (ep->extralen > 2 &&
 596                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 597                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 598                                         "from endpoint %u.\n", i);
 599                                 buffer = alts->endpoint[i].extra;
 600                                 buflen = alts->endpoint[i].extralen;
 601                                 break;
 602                         }
 603                 }
 604         }
 605
 606         /* Skip the standard interface descriptors. */
 607         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 608                 buflen -= buffer[0];
 609                 buffer += buffer[0];
 610         }
 611
 612         if (buflen <= 2) {
 613                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 614                         "interface descriptors found.\n");
 615                 goto error;
 616         }
 617
 618         /* Parse the header descriptor. */
 619         switch (buffer[2]) {
 620         case UVC_VS_OUTPUT_HEADER:
 621                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 622                 size = 9;
 623                 break;
 624
 625         case UVC_VS_INPUT_HEADER:
 626                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 627                 size = 13;
 628                 break;
 629
 630         default:
 631                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 632                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 633                         alts->desc.bInterfaceNumber);
 634                 goto error;
 635         }
 636
 637         p = buflen >= 4 ? buffer[3] : 0;
 638         n = buflen >= size ? buffer[size-1] : 0;
 639
 640         if (buflen < size + p*n) {
 641                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 642                         "interface %d HEADER descriptor is invalid.\n",
 643                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 644                 goto error;
 645         }
 646
 647         streaming->header.bNumFormats = p;
 648         streaming->header.bEndpointAddress = buffer[6];
 649         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 650                 streaming->header.bmInfo = buffer[7];
 651                 streaming->header.bTerminalLink = buffer[8];
 652                 streaming->header.bStillCaptureMethod = buffer[9];
 653                 streaming->header.bTriggerSupport = buffer[10];
 654                 streaming->header.bTriggerUsage = buffer[11];
 655         } else {
 656                 streaming->header.bTerminalLink = buffer[7];
 657         }
 658         streaming->header.bControlSize = n;
 659
 660         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 661                                                 GFP_KERNEL);
 662         if (streaming->header.bmaControls == NULL) {
 663                 ret = -ENOMEM;
 664                 goto error;
 665         }
 666
 667         buflen -= buffer[0];
 668         buffer += buffer[0];
 669
 670         _buffer = buffer;
 671         _buflen = buflen;
 672
 673         /* Count the format and frame descriptors. */
 674         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 675                 switch (_buffer[2]) {
 676                 case UVC_VS_FORMAT_UNCOMPRESSED:
 677                 case UVC_VS_FORMAT_MJPEG:
 678                 case UVC_VS_FORMAT_FRAME_BASED:
 679                         nformats++;
 680                         break;
 681
 682                 case UVC_VS_FORMAT_DV:
 683                         /* DV format has no frame descriptor. We will create a
 684                          * dummy frame descriptor with a dummy frame interval.
 685                          */
 686                         nformats++;
 687                         nframes++;
 688                         nintervals++;
 689                         break;
 690
 691                 case UVC_VS_FORMAT_MPEG2TS:
 692                 case UVC_VS_FORMAT_STREAM_BASED:
 693                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 694                                 "interface %d FORMAT %u is not supported.\n",
 695                                 dev->udev->devnum,
 696                                 alts->desc.bInterfaceNumber, _buffer[2]);
 697                         break;
 698
 699                 case UVC_VS_FRAME_UNCOMPRESSED:
 700                 case UVC_VS_FRAME_MJPEG:
 701                         nframes++;
 702                         if (_buflen > 25)
 703                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 704                         break;
 705
 706                 case UVC_VS_FRAME_FRAME_BASED:
 707                         nframes++;
 708                         if (_buflen > 21)
 709                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 710                         break;
 711                 }
 712
 713                 _buflen -= _buffer[0];
 714                 _buffer += _buffer[0];
 715         }
 716
 717         if (nformats == 0) {
 718                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 719                         "%d has no supported formats defined.\n",
 720                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 721                 goto error;
 722         }
 723
 724         size = nformats * sizeof *format + nframes * sizeof *frame
 725              + nintervals * sizeof *interval;
 726         format = kzalloc(size, GFP_KERNEL);
 727         if (format == NULL) {
 728                 ret = -ENOMEM;
 729                 goto error;
 730         }
 731
 732         frame = (struct uvc_frame *)&format[nformats];
 733         interval = (__u32 *)&frame[nframes];
 734
 735         streaming->format = format;
 736         streaming->nformats = nformats;
 737
 738         /* Parse the format descriptors. */
 739         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 740                 switch (buffer[2]) {
 741                 case UVC_VS_FORMAT_UNCOMPRESSED:
 742                 case UVC_VS_FORMAT_MJPEG:
 743                 case UVC_VS_FORMAT_DV:
 744                 case UVC_VS_FORMAT_FRAME_BASED:
 745                         format->frame = frame;
 746                         ret = uvc_parse_format(dev, streaming, format,
 747                                 &interval, buffer, buflen);
 748                         if (ret < 0)
 749                                 goto error;
 750
 751                         frame += format->nframes;
 752                         format++;
 753
 754                         buflen -= ret;
 755                         buffer += ret;
 756                         continue;
 757
 758                 default:
 759                         break;
 760                 }
 761
 762                 buflen -= buffer[0];
 763                 buffer += buffer[0];
 764         }
 765
 766         if (buflen)
 767                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 768                         "%d has %u bytes of trailing descriptor garbage.\n",
 769                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 770
 771         /* Parse the alternate settings to find the maximum bandwidth. */
 772         for (i = 0; i < intf->num_altsetting; ++i) {
 773                 struct usb_host_endpoint *ep;
 774                 alts = &intf->altsetting[i];
 775                 ep = uvc_find_endpoint(alts,
 776                                 streaming->header.bEndpointAddress);
 777                 if (ep == NULL)
 778                         continue;
 779
 780                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 781                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 782                 if (psize > streaming->maxpsize)
 783                         streaming->maxpsize = psize;
 784         }
 785
 786         list_add_tail(&streaming->list, &dev->streams);
 787         return 0;
 788
 789 error:
 790         usb_driver_release_interface(&uvc_driver.driver, intf);
 791         usb_put_intf(intf);
 792         kfree(streaming->format);
 793         kfree(streaming->header.bmaControls);
 794         kfree(streaming);
 795         return ret;
 796 }
 797
 798 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 799                 unsigned int num_pads, unsigned int extra_size)
 800 {
 801         struct uvc_entity *entity;
 802         unsigned int num_inputs;
 803         unsigned int size;
 804         unsigned int i;
 805
 806         extra_size = ALIGN(extra_size, sizeof(*entity->pads));
 807         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 808         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 809              + num_inputs;
 810         entity = kzalloc(size, GFP_KERNEL);
 811         if (entity == NULL)
 812                 return NULL;
 813
 814         entity->id = id;
 815         entity->type = type;
 816
 817         entity->num_links = 0;
 818         entity->num_pads = num_pads;
 819         entity->pads = ((void *)(entity + 1)) + extra_size;
 820
 821         for (i = 0; i < num_inputs; ++i)
 822                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 823         if (!UVC_ENTITY_IS_OTERM(entity))
 824                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 825
 826         entity->bNrInPins = num_inputs;
 827         entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
 828
 829         return entity;
 830 }
 831
 832 /* Parse vendor-specific extensions. */
 833 static int uvc_parse_vendor_control(struct uvc_device *dev,
 834         const unsigned char *buffer, int buflen)
 835 {
 836         struct usb_device *udev = dev->udev;
 837         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 838         struct uvc_entity *unit;
 839         unsigned int n, p;
 840         int handled = 0;
 841
 842         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 843         case 0x046d:            /* Logitech */
 844                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 845                         break;
 846
 847                 /* Logitech implements several vendor specific functions
 848                  * through vendor specific extension units (LXU).
 849                  *
 850                  * The LXU descriptors are similar to XU descriptors
 851                  * (see "USB Device Video Class for Video Devices", section
 852                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 853                  * differences:
 854                  *
 855                  * ----------------------------------------------------------
 856                  * 0            bLength         1        Number
 857                  *      Size of this descriptor, in bytes: 24+p+n*2
 858                  * ----------------------------------------------------------
 859                  * 23+p+n       bmControlsType  N       Bitmap
 860                  *      Individual bits in the set are defined:
 861                  *      0: Absolute
 862                  *      1: Relative
 863                  *
 864                  *      This bitset is mapped exactly the same as bmControls.
 865                  * ----------------------------------------------------------
 866                  * 23+p+n*2     bReserved       1       Boolean
 867                  * ----------------------------------------------------------
 868                  * 24+p+n*2     iExtension      1       Index
 869                  *      Index of a string descriptor that describes this
 870                  *      extension unit.
 871                  * ----------------------------------------------------------
 872                  */
 873                 p = buflen >= 22 ? buffer[21] : 0;
 874                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 875
 876                 if (buflen < 25 + p + 2*n) {
 877                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 878                                 "interface %d EXTENSION_UNIT error\n",
 879                                 udev->devnum, alts->desc.bInterfaceNumber);
 880                         break;
 881                 }
 882
 883                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
 884                                         p + 1, 2*n);
 885                 if (unit == NULL)
 886                         return -ENOMEM;
 887
 888                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 889                 unit->extension.bNumControls = buffer[20];
 890                 memcpy(unit->baSourceID, &buffer[22], p);
 891                 unit->extension.bControlSize = buffer[22+p];
 892                 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
 893                 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
 894                                                + n;
 895                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 896
 897                 if (buffer[24+p+2*n] != 0)
 898                         usb_string(udev, buffer[24+p+2*n], unit->name,
 899                                    sizeof unit->name);
 900                 else
 901                         sprintf(unit->name, "Extension %u", buffer[3]);
 902
 903                 list_add_tail(&unit->list, &dev->entities);
 904                 handled = 1;
 905                 break;
 906         }
 907
 908         return handled;
 909 }
 910
 911 static int uvc_parse_standard_control(struct uvc_device *dev,
 912         const unsigned char *buffer, int buflen)
 913 {
 914         struct usb_device *udev = dev->udev;
 915         struct uvc_entity *unit, *term;
 916         struct usb_interface *intf;
 917         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 918         unsigned int i, n, p, len;
 919         __u16 type;
 920
 921         switch (buffer[2]) {
 922         case UVC_VC_HEADER:
 923                 n = buflen >= 12 ? buffer[11] : 0;
 924
 925                 if (buflen < 12 || buflen < 12 + n) {
 926                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 927                                 "interface %d HEADER error\n", udev->devnum,
 928                                 alts->desc.bInterfaceNumber);
 929                         return -EINVAL;
 930                 }
 931
 932                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 933                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 934
 935                 /* Parse all USB Video Streaming interfaces. */
 936                 for (i = 0; i < n; ++i) {
 937                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 938                         if (intf == NULL) {
 939                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 940                                         "interface %d doesn't exists\n",
 941                                         udev->devnum, i);
 942                                 continue;
 943                         }
 944
 945                         uvc_parse_streaming(dev, intf);
 946                 }
 947                 break;
 948
 949         case UVC_VC_INPUT_TERMINAL:
 950                 if (buflen < 8) {
 951                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 952                                 "interface %d INPUT_TERMINAL error\n",
 953                                 udev->devnum, alts->desc.bInterfaceNumber);
 954                         return -EINVAL;
 955                 }
 956
 957                 /* Make sure the terminal type MSB is not null, otherwise it
 958                  * could be confused with a unit.
 959                  */
 960                 type = get_unaligned_le16(&buffer[4]);
 961                 if ((type & 0xff00) == 0) {
 962                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 963                                 "interface %d INPUT_TERMINAL %d has invalid "
 964                                 "type 0x%04x, skipping\n", udev->devnum,
 965                                 alts->desc.bInterfaceNumber,
 966                                 buffer[3], type);
 967                         return 0;
 968                 }
 969
 970                 n = 0;
 971                 p = 0;
 972                 len = 8;
 973
 974                 if (type == UVC_ITT_CAMERA) {
 975                         n = buflen >= 15 ? buffer[14] : 0;
 976                         len = 15;
 977
 978                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
 979                         n = buflen >= 9 ? buffer[8] : 0;
 980                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 981                         len = 10;
 982                 }
 983
 984                 if (buflen < len + n + p) {
 985                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 986                                 "interface %d INPUT_TERMINAL error\n",
 987                                 udev->devnum, alts->desc.bInterfaceNumber);
 988                         return -EINVAL;
 989                 }
 990
 991                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
 992                                         1, n + p);
 993                 if (term == NULL)
 994                         return -ENOMEM;
 995
 996                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
 997                         term->camera.bControlSize = n;
 998                         term->camera.bmControls = (__u8 *)term + sizeof *term;
 999                         term->camera.wObjectiveFocalLengthMin =
1000                                 get_unaligned_le16(&buffer[8]);
1001                         term->camera.wObjectiveFocalLengthMax =
1002                                 get_unaligned_le16(&buffer[10]);
1003                         term->camera.wOcularFocalLength =
1004                                 get_unaligned_le16(&buffer[12]);
1005                         memcpy(term->camera.bmControls, &buffer[15], n);
1006                 } else if (UVC_ENTITY_TYPE(term) ==
1007                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1008                         term->media.bControlSize = n;
1009                         term->media.bmControls = (__u8 *)term + sizeof *term;
1010                         term->media.bTransportModeSize = p;
1011                         term->media.bmTransportModes = (__u8 *)term
1012                                                      + sizeof *term + n;
1013                         memcpy(term->media.bmControls, &buffer[9], n);
1014                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1015                 }
1016
1017                 if (buffer[7] != 0)
1018                         usb_string(udev, buffer[7], term->name,
1019                                    sizeof term->name);
1020                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1021                         sprintf(term->name, "Camera %u", buffer[3]);
1022                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1023                         sprintf(term->name, "Media %u", buffer[3]);
1024                 else
1025                         sprintf(term->name, "Input %u", buffer[3]);
1026
1027                 list_add_tail(&term->list, &dev->entities);
1028                 break;
1029
1030         case UVC_VC_OUTPUT_TERMINAL:
1031                 if (buflen < 9) {
1032                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1033                                 "interface %d OUTPUT_TERMINAL error\n",
1034                                 udev->devnum, alts->desc.bInterfaceNumber);
1035                         return -EINVAL;
1036                 }
1037
1038                 /* Make sure the terminal type MSB is not null, otherwise it
1039                  * could be confused with a unit.
1040                  */
1041                 type = get_unaligned_le16(&buffer[4]);
1042                 if ((type & 0xff00) == 0) {
1043                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1044                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1045                                 "type 0x%04x, skipping\n", udev->devnum,
1046                                 alts->desc.bInterfaceNumber, buffer[3], type);
1047                         return 0;
1048                 }
1049
1050                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1051                                         1, 0);
1052                 if (term == NULL)
1053                         return -ENOMEM;
1054
1055                 memcpy(term->baSourceID, &buffer[7], 1);
1056
1057                 if (buffer[8] != 0)
1058                         usb_string(udev, buffer[8], term->name,
1059                                    sizeof term->name);
1060                 else
1061                         sprintf(term->name, "Output %u", buffer[3]);
1062
1063                 list_add_tail(&term->list, &dev->entities);
1064                 break;
1065
1066         case UVC_VC_SELECTOR_UNIT:
1067                 p = buflen >= 5 ? buffer[4] : 0;
1068
1069                 if (buflen < 5 || buflen < 6 + p) {
1070                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1071                                 "interface %d SELECTOR_UNIT error\n",
1072                                 udev->devnum, alts->desc.bInterfaceNumber);
1073                         return -EINVAL;
1074                 }
1075
1076                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1077                 if (unit == NULL)
1078                         return -ENOMEM;
1079
1080                 memcpy(unit->baSourceID, &buffer[5], p);
1081
1082                 if (buffer[5+p] != 0)
1083                         usb_string(udev, buffer[5+p], unit->name,
1084                                    sizeof unit->name);
1085                 else
1086                         sprintf(unit->name, "Selector %u", buffer[3]);
1087
1088                 list_add_tail(&unit->list, &dev->entities);
1089                 break;
1090
1091         case UVC_VC_PROCESSING_UNIT:
1092                 n = buflen >= 8 ? buffer[7] : 0;
1093                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1094
1095                 if (buflen < p + n) {
1096                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1097                                 "interface %d PROCESSING_UNIT error\n",
1098                                 udev->devnum, alts->desc.bInterfaceNumber);
1099                         return -EINVAL;
1100                 }
1101
1102                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1103                 if (unit == NULL)
1104                         return -ENOMEM;
1105
1106                 memcpy(unit->baSourceID, &buffer[4], 1);
1107                 unit->processing.wMaxMultiplier =
1108                         get_unaligned_le16(&buffer[5]);
1109                 unit->processing.bControlSize = buffer[7];
1110                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1111                 memcpy(unit->processing.bmControls, &buffer[8], n);
1112                 if (dev->uvc_version >= 0x0110)
1113                         unit->processing.bmVideoStandards = buffer[9+n];
1114
1115                 if (buffer[8+n] != 0)
1116                         usb_string(udev, buffer[8+n], unit->name,
1117                                    sizeof unit->name);
1118                 else
1119                         sprintf(unit->name, "Processing %u", buffer[3]);
1120
1121                 list_add_tail(&unit->list, &dev->entities);
1122                 break;
1123
1124         case UVC_VC_EXTENSION_UNIT:
1125                 p = buflen >= 22 ? buffer[21] : 0;
1126                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1127
1128                 if (buflen < 24 + p + n) {
1129                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1130                                 "interface %d EXTENSION_UNIT error\n",
1131                                 udev->devnum, alts->desc.bInterfaceNumber);
1132                         return -EINVAL;
1133                 }
1134
1135                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1136                 if (unit == NULL)
1137                         return -ENOMEM;
1138
1139                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1140                 unit->extension.bNumControls = buffer[20];
1141                 memcpy(unit->baSourceID, &buffer[22], p);
1142                 unit->extension.bControlSize = buffer[22+p];
1143                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1144                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1145
1146                 if (buffer[23+p+n] != 0)
1147                         usb_string(udev, buffer[23+p+n], unit->name,
1148                                    sizeof unit->name);
1149                 else
1150                         sprintf(unit->name, "Extension %u", buffer[3]);
1151
1152                 list_add_tail(&unit->list, &dev->entities);
1153                 break;
1154
1155         default:
1156                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1157                         "descriptor (%u)\n", buffer[2]);
1158                 break;
1159         }
1160
1161         return 0;
1162 }
1163
1164 static int uvc_parse_control(struct uvc_device *dev)
1165 {
1166         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1167         unsigned char *buffer = alts->extra;
1168         int buflen = alts->extralen;
1169         int ret;
1170
1171         /* Parse the default alternate setting only, as the UVC specification
1172          * defines a single alternate setting, the default alternate setting
1173          * zero.
1174          */
1175
1176         while (buflen > 2) {
1177                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1178                     buffer[1] != USB_DT_CS_INTERFACE)
1179                         goto next_descriptor;
1180
1181                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1182                         return ret;
1183
1184 next_descriptor:
1185                 buflen -= buffer[0];
1186                 buffer += buffer[0];
1187         }
1188
1189         /* Check if the optional status endpoint is present. Built-in iSight
1190          * webcams have an interrupt endpoint but spit proprietary data that
1191          * don't conform to the UVC status endpoint messages. Don't try to
1192          * handle the interrupt endpoint for those cameras.
1193          */
1194         if (alts->desc.bNumEndpoints == 1 &&
1195             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1196                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1197                 struct usb_endpoint_descriptor *desc = &ep->desc;
1198
1199                 if (usb_endpoint_is_int_in(desc) &&
1200                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1201                     desc->bInterval != 0) {
1202                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1203                                 "(addr %02x).\n", desc->bEndpointAddress);
1204                         dev->int_ep = ep;
1205                 }
1206         }
1207
1208         return 0;
1209 }
1210
1211 /* ------------------------------------------------------------------------
1212  * UVC device scan
1213  */
1214
1215 /*
1216  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1217  * and containing the following units:
1218  *
1219  * - one or more Output Terminals (USB Streaming or Display)
1220  * - zero or one Processing Unit
1221  * - zero, one or more single-input Selector Units
1222  * - zero or one multiple-input Selector Units, provided all inputs are
1223  *   connected to input terminals
1224  * - zero, one or mode single-input Extension Units
1225  * - one or more Input Terminals (Camera, External or USB Streaming)
1226  *
1227  * The terminal and units must match on of the following structures:
1228  *
1229  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1230  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1231  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1232  *
1233  *                 +---------+    +---------+ -> OTT_*(0)
1234  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1235  *                 +---------+    +---------+ -> OTT_*(n)
1236  *
1237  * The Processing Unit and Extension Units can be in any order. Additional
1238  * Extension Units connected to the main chain as single-unit branches are
1239  * also supported. Single-input Selector Units are ignored.
1240  */
1241 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1242         struct uvc_entity *entity)
1243 {
1244         switch (UVC_ENTITY_TYPE(entity)) {
1245         case UVC_VC_EXTENSION_UNIT:
1246                 if (uvc_trace_param & UVC_TRACE_PROBE)
1247                         printk(" <- XU %d", entity->id);
1248
1249                 if (entity->bNrInPins != 1) {
1250                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1251                                 "than 1 input pin.\n", entity->id);
1252                         return -1;
1253                 }
1254
1255                 break;
1256
1257         case UVC_VC_PROCESSING_UNIT:
1258                 if (uvc_trace_param & UVC_TRACE_PROBE)
1259                         printk(" <- PU %d", entity->id);
1260
1261                 if (chain->processing != NULL) {
1262                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1263                                 "Processing Units in chain.\n");
1264                         return -1;
1265                 }
1266
1267                 chain->processing = entity;
1268                 break;
1269
1270         case UVC_VC_SELECTOR_UNIT:
1271                 if (uvc_trace_param & UVC_TRACE_PROBE)
1272                         printk(" <- SU %d", entity->id);
1273
1274                 /* Single-input selector units are ignored. */
1275                 if (entity->bNrInPins == 1)
1276                         break;
1277
1278                 if (chain->selector != NULL) {
1279                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1280                                 "Units in chain.\n");
1281                         return -1;
1282                 }
1283
1284                 chain->selector = entity;
1285                 break;
1286
1287         case UVC_ITT_VENDOR_SPECIFIC:
1288         case UVC_ITT_CAMERA:
1289         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1290                 if (uvc_trace_param & UVC_TRACE_PROBE)
1291                         printk(" <- IT %d\n", entity->id);
1292
1293                 break;
1294
1295         case UVC_OTT_VENDOR_SPECIFIC:
1296         case UVC_OTT_DISPLAY:
1297         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1298                 if (uvc_trace_param & UVC_TRACE_PROBE)
1299                         printk(" OT %d", entity->id);
1300
1301                 break;
1302
1303         case UVC_TT_STREAMING:
1304                 if (UVC_ENTITY_IS_ITERM(entity)) {
1305                         if (uvc_trace_param & UVC_TRACE_PROBE)
1306                                 printk(" <- IT %d\n", entity->id);
1307                 } else {
1308                         if (uvc_trace_param & UVC_TRACE_PROBE)
1309                                 printk(" OT %d", entity->id);
1310                 }
1311
1312                 break;
1313
1314         default:
1315                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1316                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1317                 return -1;
1318         }
1319
1320         list_add_tail(&entity->chain, &chain->entities);
1321         return 0;
1322 }
1323
1324 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1325         struct uvc_entity *entity, struct uvc_entity *prev)
1326 {
1327         struct uvc_entity *forward;
1328         int found;
1329
1330         /* Forward scan */
1331         forward = NULL;
1332         found = 0;
1333
1334         while (1) {
1335                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1336                         forward);
1337                 if (forward == NULL)
1338                         break;
1339                 if (forward == prev)
1340                         continue;
1341
1342                 switch (UVC_ENTITY_TYPE(forward)) {
1343                 case UVC_VC_EXTENSION_UNIT:
1344                         if (forward->bNrInPins != 1) {
1345                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1346                                           "has more than 1 input pin.\n",
1347                                           entity->id);
1348                                 return -EINVAL;
1349                         }
1350
1351                         list_add_tail(&forward->chain, &chain->entities);
1352                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1353                                 if (!found)
1354                                         printk(" (->");
1355
1356                                 printk(" XU %d", forward->id);
1357                                 found = 1;
1358                         }
1359                         break;
1360
1361                 case UVC_OTT_VENDOR_SPECIFIC:
1362                 case UVC_OTT_DISPLAY:
1363                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1364                 case UVC_TT_STREAMING:
1365                         if (UVC_ENTITY_IS_ITERM(forward)) {
1366                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1367                                         "terminal %u.\n", forward->id);
1368                                 return -EINVAL;
1369                         }
1370
1371                         list_add_tail(&forward->chain, &chain->entities);
1372                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1373                                 if (!found)
1374                                         printk(" (->");
1375
1376                                 printk(" OT %d", forward->id);
1377                                 found = 1;
1378                         }
1379                         break;
1380                 }
1381         }
1382         if (found)
1383                 printk(")");
1384
1385         return 0;
1386 }
1387
1388 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1389         struct uvc_entity **_entity)
1390 {
1391         struct uvc_entity *entity = *_entity;
1392         struct uvc_entity *term;
1393         int id = -EINVAL, i;
1394
1395         switch (UVC_ENTITY_TYPE(entity)) {
1396         case UVC_VC_EXTENSION_UNIT:
1397         case UVC_VC_PROCESSING_UNIT:
1398                 id = entity->baSourceID[0];
1399                 break;
1400
1401         case UVC_VC_SELECTOR_UNIT:
1402                 /* Single-input selector units are ignored. */
1403                 if (entity->bNrInPins == 1) {
1404                         id = entity->baSourceID[0];
1405                         break;
1406                 }
1407
1408                 if (uvc_trace_param & UVC_TRACE_PROBE)
1409                         printk(" <- IT");
1410
1411                 chain->selector = entity;
1412                 for (i = 0; i < entity->bNrInPins; ++i) {
1413                         id = entity->baSourceID[i];
1414                         term = uvc_entity_by_id(chain->dev, id);
1415                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1416                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1417                                         "input %d isn't connected to an "
1418                                         "input terminal\n", entity->id, i);
1419                                 return -1;
1420                         }
1421
1422                         if (uvc_trace_param & UVC_TRACE_PROBE)
1423                                 printk(" %d", term->id);
1424
1425                         list_add_tail(&term->chain, &chain->entities);
1426                         uvc_scan_chain_forward(chain, term, entity);
1427                 }
1428
1429                 if (uvc_trace_param & UVC_TRACE_PROBE)
1430                         printk("\n");
1431
1432                 id = 0;
1433                 break;
1434
1435         case UVC_ITT_VENDOR_SPECIFIC:
1436         case UVC_ITT_CAMERA:
1437         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1438         case UVC_OTT_VENDOR_SPECIFIC:
1439         case UVC_OTT_DISPLAY:
1440         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1441         case UVC_TT_STREAMING:
1442                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1443                 break;
1444         }
1445
1446         if (id <= 0) {
1447                 *_entity = NULL;
1448                 return id;
1449         }
1450
1451         entity = uvc_entity_by_id(chain->dev, id);
1452         if (entity == NULL) {
1453                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1454                         "unknown entity %d.\n", id);
1455                 return -EINVAL;
1456         }
1457
1458         *_entity = entity;
1459         return 0;
1460 }
1461
1462 static int uvc_scan_chain(struct uvc_video_chain *chain,
1463                           struct uvc_entity *term)
1464 {
1465         struct uvc_entity *entity, *prev;
1466
1467         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1468
1469         entity = term;
1470         prev = NULL;
1471
1472         while (entity != NULL) {
1473                 /* Entity must not be part of an existing chain */
1474                 if (entity->chain.next || entity->chain.prev) {
1475                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1476                                 "entity %d already in chain.\n", entity->id);
1477                         return -EINVAL;
1478                 }
1479
1480                 /* Process entity */
1481                 if (uvc_scan_chain_entity(chain, entity) < 0)
1482                         return -EINVAL;
1483
1484                 /* Forward scan */
1485                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1486                         return -EINVAL;
1487
1488                 /* Backward scan */
1489                 prev = entity;
1490                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1491                         return -EINVAL;
1492         }
1493
1494         return 0;
1495 }
1496
1497 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1498                 char *buffer)
1499 {
1500         struct uvc_entity *term;
1501         unsigned int nterms = 0;
1502         char *p = buffer;
1503
1504         list_for_each_entry(term, terms, chain) {
1505                 if (!UVC_ENTITY_IS_TERM(term) ||
1506                     UVC_TERM_DIRECTION(term) != dir)
1507                         continue;
1508
1509                 if (nterms)
1510                         p += sprintf(p, ",");
1511                 if (++nterms >= 4) {
1512                         p += sprintf(p, "...");
1513                         break;
1514                 }
1515                 p += sprintf(p, "%u", term->id);
1516         }
1517
1518         return p - buffer;
1519 }
1520
1521 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1522 {
1523         static char buffer[43];
1524         char *p = buffer;
1525
1526         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1527         p += sprintf(p, " -> ");
1528         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1529
1530         return buffer;
1531 }
1532
1533 /*
1534  * Scan the device for video chains and register video devices.
1535  *
1536  * Chains are scanned starting at their output terminals and walked backwards.
1537  */
1538 static int uvc_scan_device(struct uvc_device *dev)
1539 {
1540         struct uvc_video_chain *chain;
1541         struct uvc_entity *term;
1542
1543         list_for_each_entry(term, &dev->entities, list) {
1544                 if (!UVC_ENTITY_IS_OTERM(term))
1545                         continue;
1546
1547                 /* If the terminal is already included in a chain, skip it.
1548                  * This can happen for chains that have multiple output
1549                  * terminals, where all output terminals beside the first one
1550                  * will be inserted in the chain in forward scans.
1551                  */
1552                 if (term->chain.next || term->chain.prev)
1553                         continue;
1554
1555                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1556                 if (chain == NULL)
1557                         return -ENOMEM;
1558
1559                 INIT_LIST_HEAD(&chain->entities);
1560                 mutex_init(&chain->ctrl_mutex);
1561                 chain->dev = dev;
1562
1563                 if (uvc_scan_chain(chain, term) < 0) {
1564                         kfree(chain);
1565                         continue;
1566                 }
1567
1568                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1569                           uvc_print_chain(chain));
1570
1571                 list_add_tail(&chain->list, &dev->chains);
1572         }
1573
1574         if (list_empty(&dev->chains)) {
1575                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1576                 return -1;
1577         }
1578
1579         return 0;
1580 }
1581
1582 /* ------------------------------------------------------------------------
1583  * Video device registration and unregistration
1584  */
1585
1586 /*
1587  * Delete the UVC device.
1588  *
1589  * Called by the kernel when the last reference to the uvc_device structure
1590  * is released.
1591  *
1592  * As this function is called after or during disconnect(), all URBs have
1593  * already been canceled by the USB core. There is no need to kill the
1594  * interrupt URB manually.
1595  */
1596 static void uvc_delete(struct uvc_device *dev)
1597 {
1598         struct list_head *p, *n;
1599
1600         uvc_status_cleanup(dev);
1601         uvc_ctrl_cleanup_device(dev);
1602
1603         usb_put_intf(dev->intf);
1604         usb_put_dev(dev->udev);
1605
1606         if (dev->vdev.dev)
1607                 v4l2_device_unregister(&dev->vdev);
1608 #ifdef CONFIG_MEDIA_CONTROLLER
1609         if (media_devnode_is_registered(&dev->mdev.devnode))
1610                 media_device_unregister(&dev->mdev);
1611 #endif
1612
1613         list_for_each_safe(p, n, &dev->chains) {
1614                 struct uvc_video_chain *chain;
1615                 chain = list_entry(p, struct uvc_video_chain, list);
1616                 kfree(chain);
1617         }
1618
1619         list_for_each_safe(p, n, &dev->entities) {
1620                 struct uvc_entity *entity;
1621                 entity = list_entry(p, struct uvc_entity, list);
1622 #ifdef CONFIG_MEDIA_CONTROLLER
1623                 uvc_mc_cleanup_entity(entity);
1624 #endif
1625                 if (entity->vdev) {
1626                         video_device_release(entity->vdev);
1627                         entity->vdev = NULL;
1628                 }
1629                 kfree(entity);
1630         }
1631
1632         list_for_each_safe(p, n, &dev->streams) {
1633                 struct uvc_streaming *streaming;
1634                 streaming = list_entry(p, struct uvc_streaming, list);
1635                 usb_driver_release_interface(&uvc_driver.driver,
1636                         streaming->intf);
1637                 usb_put_intf(streaming->intf);
1638                 kfree(streaming->format);
1639                 kfree(streaming->header.bmaControls);
1640                 kfree(streaming);
1641         }
1642
1643         kfree(dev);
1644 }
1645
1646 static void uvc_release(struct video_device *vdev)
1647 {
1648         struct uvc_streaming *stream = video_get_drvdata(vdev);
1649         struct uvc_device *dev = stream->dev;
1650
1651         /* Decrement the registered streams count and delete the device when it
1652          * reaches zero.
1653          */
1654         if (atomic_dec_and_test(&dev->nstreams))
1655                 uvc_delete(dev);
1656 }
1657
1658 /*
1659  * Unregister the video devices.
1660  */
1661 static void uvc_unregister_video(struct uvc_device *dev)
1662 {
1663         struct uvc_streaming *stream;
1664
1665         /* Unregistering all video devices might result in uvc_delete() being
1666          * called from inside the loop if there's no open file handle. To avoid
1667          * that, increment the stream count before iterating over the streams
1668          * and decrement it when done.
1669          */
1670         atomic_inc(&dev->nstreams);
1671
1672         list_for_each_entry(stream, &dev->streams, list) {
1673                 if (stream->vdev == NULL)
1674                         continue;
1675
1676                 video_unregister_device(stream->vdev);
1677                 stream->vdev = NULL;
1678         }
1679
1680         /* Decrement the stream count and call uvc_delete explicitly if there
1681          * are no stream left.
1682          */
1683         if (atomic_dec_and_test(&dev->nstreams))
1684                 uvc_delete(dev);
1685 }
1686
1687 static int uvc_register_video(struct uvc_device *dev,
1688                 struct uvc_streaming *stream)
1689 {
1690         struct video_device *vdev;
1691         int ret;
1692
1693         /* Initialize the streaming interface with default streaming
1694          * parameters.
1695          */
1696         ret = uvc_video_init(stream);
1697         if (ret < 0) {
1698                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1699                         "(%d).\n", ret);
1700                 return ret;
1701         }
1702
1703         /* Register the device with V4L. */
1704         vdev = video_device_alloc();
1705         if (vdev == NULL) {
1706                 uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
1707                            ret);
1708                 return -ENOMEM;
1709         }
1710
1711         /* We already hold a reference to dev->udev. The video device will be
1712          * unregistered before the reference is released, so we don't need to
1713          * get another one.
1714          */
1715         vdev->v4l2_dev = &dev->vdev;
1716         vdev->fops = &uvc_fops;
1717         vdev->release = uvc_release;
1718         strlcpy(vdev->name, dev->name, sizeof vdev->name);
1719
1720         /* Set the driver data before calling video_register_device, otherwise
1721          * uvc_v4l2_open might race us.
1722          */
1723         stream->vdev = vdev;
1724         video_set_drvdata(vdev, stream);
1725
1726         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1727         if (ret < 0) {
1728                 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1729                            ret);
1730                 stream->vdev = NULL;
1731                 video_device_release(vdev);
1732                 return ret;
1733         }
1734
1735         atomic_inc(&dev->nstreams);
1736         return 0;
1737 }
1738
1739 /*
1740  * Register all video devices in all chains.
1741  */
1742 static int uvc_register_terms(struct uvc_device *dev,
1743         struct uvc_video_chain *chain)
1744 {
1745         struct uvc_streaming *stream;
1746         struct uvc_entity *term;
1747         int ret;
1748
1749         list_for_each_entry(term, &chain->entities, chain) {
1750                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1751                         continue;
1752
1753                 stream = uvc_stream_by_id(dev, term->id);
1754                 if (stream == NULL) {
1755                         uvc_printk(KERN_INFO, "No streaming interface found "
1756                                    "for terminal %u.", term->id);
1757                         continue;
1758                 }
1759
1760                 stream->chain = chain;
1761                 ret = uvc_register_video(dev, stream);
1762                 if (ret < 0)
1763                         return ret;
1764
1765                 term->vdev = stream->vdev;
1766         }
1767
1768         return 0;
1769 }
1770
1771 static int uvc_register_chains(struct uvc_device *dev)
1772 {
1773         struct uvc_video_chain *chain;
1774         int ret;
1775
1776         list_for_each_entry(chain, &dev->chains, list) {
1777                 ret = uvc_register_terms(dev, chain);
1778                 if (ret < 0)
1779                         return ret;
1780
1781 #ifdef CONFIG_MEDIA_CONTROLLER
1782                 ret = uvc_mc_register_entities(chain);
1783                 if (ret < 0) {
1784                         uvc_printk(KERN_INFO, "Failed to register entites "
1785                                 "(%d).\n", ret);
1786                 }
1787 #endif
1788         }
1789
1790         return 0;
1791 }
1792
1793 /* ------------------------------------------------------------------------
1794  * USB probe, disconnect, suspend and resume
1795  */
1796
1797 static int uvc_probe(struct usb_interface *intf,
1798                      const struct usb_device_id *id)
1799 {
1800         struct usb_device *udev = interface_to_usbdev(intf);
1801         struct uvc_device *dev;
1802         int ret;
1803
1804         if (id->idVendor && id->idProduct)
1805                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1806                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1807                                 id->idProduct);
1808         else
1809                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1810                                 udev->devpath);
1811
1812         /* Allocate memory for the device and initialize it. */
1813         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1814                 return -ENOMEM;
1815
1816         INIT_LIST_HEAD(&dev->entities);
1817         INIT_LIST_HEAD(&dev->chains);
1818         INIT_LIST_HEAD(&dev->streams);
1819         atomic_set(&dev->nstreams, 0);
1820         atomic_set(&dev->users, 0);
1821         atomic_set(&dev->nmappings, 0);
1822
1823         dev->udev = usb_get_dev(udev);
1824         dev->intf = usb_get_intf(intf);
1825         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1826         dev->quirks = (uvc_quirks_param == -1)
1827                     ? id->driver_info : uvc_quirks_param;
1828
1829         if (udev->product != NULL)
1830                 strlcpy(dev->name, udev->product, sizeof dev->name);
1831         else
1832                 snprintf(dev->name, sizeof dev->name,
1833                         "UVC Camera (%04x:%04x)",
1834                         le16_to_cpu(udev->descriptor.idVendor),
1835                         le16_to_cpu(udev->descriptor.idProduct));
1836
1837         /* Parse the Video Class control descriptor. */
1838         if (uvc_parse_control(dev) < 0) {
1839                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1840                         "descriptors.\n");
1841                 goto error;
1842         }
1843
1844         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
1845                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1846                 udev->product ? udev->product : "<unnamed>",
1847                 le16_to_cpu(udev->descriptor.idVendor),
1848                 le16_to_cpu(udev->descriptor.idProduct));
1849
1850         if (dev->quirks != id->driver_info) {
1851                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
1852                         "parameter for testing purpose.\n", dev->quirks);
1853                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1854                         "linux-uvc-devel mailing list.\n");
1855         }
1856
1857         /* Register the media and V4L2 devices. */
1858 #ifdef CONFIG_MEDIA_CONTROLLER
1859         dev->mdev.dev = &intf->dev;
1860         strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
1861         if (udev->serial)
1862                 strlcpy(dev->mdev.serial, udev->serial,
1863                         sizeof(dev->mdev.serial));
1864         strcpy(dev->mdev.bus_info, udev->devpath);
1865         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
1866         dev->mdev.driver_version = LINUX_VERSION_CODE;
1867         if (media_device_register(&dev->mdev) < 0)
1868                 goto error;
1869
1870         dev->vdev.mdev = &dev->mdev;
1871 #endif
1872         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
1873                 goto error;
1874
1875         /* Initialize controls. */
1876         if (uvc_ctrl_init_device(dev) < 0)
1877                 goto error;
1878
1879         /* Scan the device for video chains. */
1880         if (uvc_scan_device(dev) < 0)
1881                 goto error;
1882
1883         /* Register video device nodes. */
1884         if (uvc_register_chains(dev) < 0)
1885                 goto error;
1886
1887         /* Save our data pointer in the interface data. */
1888         usb_set_intfdata(intf, dev);
1889
1890         /* Initialize the interrupt URB. */
1891         if ((ret = uvc_status_init(dev)) < 0) {
1892                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1893                         "endpoint (%d), status interrupt will not be "
1894                         "supported.\n", ret);
1895         }
1896
1897         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1898         usb_enable_autosuspend(udev);
1899         return 0;
1900
1901 error:
1902         uvc_unregister_video(dev);
1903         return -ENODEV;
1904 }
1905
1906 static void uvc_disconnect(struct usb_interface *intf)
1907 {
1908         struct uvc_device *dev = usb_get_intfdata(intf);
1909
1910         /* Set the USB interface data to NULL. This can be done outside the
1911          * lock, as there's no other reader.
1912          */
1913         usb_set_intfdata(intf, NULL);
1914
1915         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1916             UVC_SC_VIDEOSTREAMING)
1917                 return;
1918
1919         dev->state |= UVC_DEV_DISCONNECTED;
1920
1921         uvc_unregister_video(dev);
1922 }
1923
1924 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1925 {
1926         struct uvc_device *dev = usb_get_intfdata(intf);
1927         struct uvc_streaming *stream;
1928
1929         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1930                 intf->cur_altsetting->desc.bInterfaceNumber);
1931
1932         /* Controls are cached on the fly so they don't need to be saved. */
1933         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1934             UVC_SC_VIDEOCONTROL)
1935                 return uvc_status_suspend(dev);
1936
1937         list_for_each_entry(stream, &dev->streams, list) {
1938                 if (stream->intf == intf)
1939                         return uvc_video_suspend(stream);
1940         }
1941
1942         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
1943                         "mismatch.\n");
1944         return -EINVAL;
1945 }
1946
1947 static int __uvc_resume(struct usb_interface *intf, int reset)
1948 {
1949         struct uvc_device *dev = usb_get_intfdata(intf);
1950         struct uvc_streaming *stream;
1951
1952         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1953                 intf->cur_altsetting->desc.bInterfaceNumber);
1954
1955         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1956             UVC_SC_VIDEOCONTROL) {
1957                 if (reset) {
1958                         int ret = uvc_ctrl_resume_device(dev);
1959
1960                         if (ret < 0)
1961                                 return ret;
1962                 }
1963
1964                 return uvc_status_resume(dev);
1965         }
1966
1967         list_for_each_entry(stream, &dev->streams, list) {
1968                 if (stream->intf == intf)
1969                         return uvc_video_resume(stream, reset);
1970         }
1971
1972         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
1973                         "mismatch.\n");
1974         return -EINVAL;
1975 }
1976
1977 static int uvc_resume(struct usb_interface *intf)
1978 {
1979         return __uvc_resume(intf, 0);
1980 }
1981
1982 static int uvc_reset_resume(struct usb_interface *intf)
1983 {
1984         return __uvc_resume(intf, 1);
1985 }
1986
1987 /* ------------------------------------------------------------------------
1988  * Module parameters
1989  */
1990
1991 static int uvc_clock_param_get(char *buffer, struct kernel_param *kp)
1992 {
1993         if (uvc_clock_param == CLOCK_MONOTONIC)
1994                 return sprintf(buffer, "CLOCK_MONOTONIC");
1995         else
1996                 return sprintf(buffer, "CLOCK_REALTIME");
1997 }
1998
1999 static int uvc_clock_param_set(const char *val, struct kernel_param *kp)
2000 {
2001         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2002                 val += strlen("clock_");
2003
2004         if (strcasecmp(val, "monotonic") == 0)
2005                 uvc_clock_param = CLOCK_MONOTONIC;
2006         else if (strcasecmp(val, "realtime") == 0)
2007                 uvc_clock_param = CLOCK_REALTIME;
2008         else
2009                 return -EINVAL;
2010
2011         return 0;
2012 }
2013
2014 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2015                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2016 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2017 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2018 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2019 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2020 MODULE_PARM_DESC(quirks, "Forced device quirks");
2021 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2022 MODULE_PARM_DESC(trace, "Trace level bitmask");
2023 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2024 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2025
2026 /* ------------------------------------------------------------------------
2027  * Driver initialization and cleanup
2028  */
2029
2030 /*
2031  * The Logitech cameras listed below have their interface class set to
2032  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2033  * though they are compliant.
2034  */
2035 static struct usb_device_id uvc_ids[] = {
2036         /* Genius eFace 2025 */
2037         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2038                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2039           .idVendor             = 0x0458,
2040           .idProduct            = 0x706e,
2041           .bInterfaceClass      = USB_CLASS_VIDEO,
2042           .bInterfaceSubClass   = 1,
2043           .bInterfaceProtocol   = 0,
2044           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2045         /* Microsoft Lifecam NX-6000 */
2046         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2047                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2048           .idVendor             = 0x045e,
2049           .idProduct            = 0x00f8,
2050           .bInterfaceClass      = USB_CLASS_VIDEO,
2051           .bInterfaceSubClass   = 1,
2052           .bInterfaceProtocol   = 0,
2053           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2054         /* Microsoft Lifecam VX-7000 */
2055         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2056                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2057           .idVendor             = 0x045e,
2058           .idProduct            = 0x0723,
2059           .bInterfaceClass      = USB_CLASS_VIDEO,
2060           .bInterfaceSubClass   = 1,
2061           .bInterfaceProtocol   = 0,
2062           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2063         /* Logitech Quickcam Fusion */
2064         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2065                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2066           .idVendor             = 0x046d,
2067           .idProduct            = 0x08c1,
2068           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2069           .bInterfaceSubClass   = 1,
2070           .bInterfaceProtocol   = 0 },
2071         /* Logitech Quickcam Orbit MP */
2072         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2073                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2074           .idVendor             = 0x046d,
2075           .idProduct            = 0x08c2,
2076           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2077           .bInterfaceSubClass   = 1,
2078           .bInterfaceProtocol   = 0 },
2079         /* Logitech Quickcam Pro for Notebook */
2080         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2081                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2082           .idVendor             = 0x046d,
2083           .idProduct            = 0x08c3,
2084           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2085           .bInterfaceSubClass   = 1,
2086           .bInterfaceProtocol   = 0 },
2087         /* Logitech Quickcam Pro 5000 */
2088         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2089                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2090           .idVendor             = 0x046d,
2091           .idProduct            = 0x08c5,
2092           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2093           .bInterfaceSubClass   = 1,
2094           .bInterfaceProtocol   = 0 },
2095         /* Logitech Quickcam OEM Dell Notebook */
2096         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2097                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2098           .idVendor             = 0x046d,
2099           .idProduct            = 0x08c6,
2100           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2101           .bInterfaceSubClass   = 1,
2102           .bInterfaceProtocol   = 0 },
2103         /* Logitech Quickcam OEM Cisco VT Camera II */
2104         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2105                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2106           .idVendor             = 0x046d,
2107           .idProduct            = 0x08c7,
2108           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2109           .bInterfaceSubClass   = 1,
2110           .bInterfaceProtocol   = 0 },
2111         /* Chicony CNF7129 (Asus EEE 100HE) */
2112         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2113                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2114           .idVendor             = 0x04f2,
2115           .idProduct            = 0xb071,
2116           .bInterfaceClass      = USB_CLASS_VIDEO,
2117           .bInterfaceSubClass   = 1,
2118           .bInterfaceProtocol   = 0,
2119           .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
2120         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2121         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2122                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2123           .idVendor             = 0x058f,
2124           .idProduct            = 0x3820,
2125           .bInterfaceClass      = USB_CLASS_VIDEO,
2126           .bInterfaceSubClass   = 1,
2127           .bInterfaceProtocol   = 0,
2128           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2129         /* Dell XPS M1330 (OmniVision OV7670 webcam) */
2130         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2131                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2132           .idVendor             = 0x05a9,
2133           .idProduct            = 0x7670,
2134           .bInterfaceClass      = USB_CLASS_VIDEO,
2135           .bInterfaceSubClass   = 1,
2136           .bInterfaceProtocol   = 0,
2137           .driver_info          = UVC_QUIRK_PROBE_DEF },
2138         /* Apple Built-In iSight */
2139         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2140                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2141           .idVendor             = 0x05ac,
2142           .idProduct            = 0x8501,
2143           .bInterfaceClass      = USB_CLASS_VIDEO,
2144           .bInterfaceSubClass   = 1,
2145           .bInterfaceProtocol   = 0,
2146           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2147                                 | UVC_QUIRK_BUILTIN_ISIGHT },
2148         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2149         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2150                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2151           .idVendor             = 0x05c8,
2152           .idProduct            = 0x0403,
2153           .bInterfaceClass      = USB_CLASS_VIDEO,
2154           .bInterfaceSubClass   = 1,
2155           .bInterfaceProtocol   = 0,
2156           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2157         /* Genesys Logic USB 2.0 PC Camera */
2158         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2159                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2160           .idVendor             = 0x05e3,
2161           .idProduct            = 0x0505,
2162           .bInterfaceClass      = USB_CLASS_VIDEO,
2163           .bInterfaceSubClass   = 1,
2164           .bInterfaceProtocol   = 0,
2165           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2166         /* Hercules Classic Silver */
2167         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2168                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2169           .idVendor             = 0x06f8,
2170           .idProduct            = 0x300c,
2171           .bInterfaceClass      = USB_CLASS_VIDEO,
2172           .bInterfaceSubClass   = 1,
2173           .bInterfaceProtocol   = 0,
2174           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2175         /* ViMicro Vega */
2176         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2177                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2178           .idVendor             = 0x0ac8,
2179           .idProduct            = 0x332d,
2180           .bInterfaceClass      = USB_CLASS_VIDEO,
2181           .bInterfaceSubClass   = 1,
2182           .bInterfaceProtocol   = 0,
2183           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2184         /* ViMicro - Minoru3D */
2185         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2186                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2187           .idVendor             = 0x0ac8,
2188           .idProduct            = 0x3410,
2189           .bInterfaceClass      = USB_CLASS_VIDEO,
2190           .bInterfaceSubClass   = 1,
2191           .bInterfaceProtocol   = 0,
2192           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2193         /* ViMicro Venus - Minoru3D */
2194         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2195                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2196           .idVendor             = 0x0ac8,
2197           .idProduct            = 0x3420,
2198           .bInterfaceClass      = USB_CLASS_VIDEO,
2199           .bInterfaceSubClass   = 1,
2200           .bInterfaceProtocol   = 0,
2201           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2202         /* MT6227 */
2203         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2204                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2205           .idVendor             = 0x0e8d,
2206           .idProduct            = 0x0004,
2207           .bInterfaceClass      = USB_CLASS_VIDEO,
2208           .bInterfaceSubClass   = 1,
2209           .bInterfaceProtocol   = 0,
2210           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2211                                 | UVC_QUIRK_PROBE_DEF },
2212         /* IMC Networks (Medion Akoya) */
2213         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2214                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2215           .idVendor             = 0x13d3,
2216           .idProduct            = 0x5103,
2217           .bInterfaceClass      = USB_CLASS_VIDEO,
2218           .bInterfaceSubClass   = 1,
2219           .bInterfaceProtocol   = 0,
2220           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2221         /* JMicron USB2.0 XGA WebCam */
2222         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2223                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2224           .idVendor             = 0x152d,
2225           .idProduct            = 0x0310,
2226           .bInterfaceClass      = USB_CLASS_VIDEO,
2227           .bInterfaceSubClass   = 1,
2228           .bInterfaceProtocol   = 0,
2229           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2230         /* Syntek (HP Spartan) */
2231         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2232                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2233           .idVendor             = 0x174f,
2234           .idProduct            = 0x5212,
2235           .bInterfaceClass      = USB_CLASS_VIDEO,
2236           .bInterfaceSubClass   = 1,
2237           .bInterfaceProtocol   = 0,
2238           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2239         /* Syntek (Samsung Q310) */
2240         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2241                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2242           .idVendor             = 0x174f,
2243           .idProduct            = 0x5931,
2244           .bInterfaceClass      = USB_CLASS_VIDEO,
2245           .bInterfaceSubClass   = 1,
2246           .bInterfaceProtocol   = 0,
2247           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2248         /* Syntek (Packard Bell EasyNote MX52 */
2249         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2250                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2251           .idVendor             = 0x174f,
2252           .idProduct            = 0x8a12,
2253           .bInterfaceClass      = USB_CLASS_VIDEO,
2254           .bInterfaceSubClass   = 1,
2255           .bInterfaceProtocol   = 0,
2256           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2257         /* Syntek (Asus F9SG) */
2258         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2259                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2260           .idVendor             = 0x174f,
2261           .idProduct            = 0x8a31,
2262           .bInterfaceClass      = USB_CLASS_VIDEO,
2263           .bInterfaceSubClass   = 1,
2264           .bInterfaceProtocol   = 0,
2265           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2266         /* Syntek (Asus U3S) */
2267         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2268                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2269           .idVendor             = 0x174f,
2270           .idProduct            = 0x8a33,
2271           .bInterfaceClass      = USB_CLASS_VIDEO,
2272           .bInterfaceSubClass   = 1,
2273           .bInterfaceProtocol   = 0,
2274           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2275         /* Syntek (JAOtech Smart Terminal) */
2276         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2277                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2278           .idVendor             = 0x174f,
2279           .idProduct            = 0x8a34,
2280           .bInterfaceClass      = USB_CLASS_VIDEO,
2281           .bInterfaceSubClass   = 1,
2282           .bInterfaceProtocol   = 0,
2283           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2284         /* Miricle 307K */
2285         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2286                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2287           .idVendor             = 0x17dc,
2288           .idProduct            = 0x0202,
2289           .bInterfaceClass      = USB_CLASS_VIDEO,
2290           .bInterfaceSubClass   = 1,
2291           .bInterfaceProtocol   = 0,
2292           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2293         /* Lenovo Thinkpad SL400/SL500 */
2294         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2295                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2296           .idVendor             = 0x17ef,
2297           .idProduct            = 0x480b,
2298           .bInterfaceClass      = USB_CLASS_VIDEO,
2299           .bInterfaceSubClass   = 1,
2300           .bInterfaceProtocol   = 0,
2301           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2302         /* Aveo Technology USB 2.0 Camera */
2303         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2304                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2305           .idVendor             = 0x1871,
2306           .idProduct            = 0x0306,
2307           .bInterfaceClass      = USB_CLASS_VIDEO,
2308           .bInterfaceSubClass   = 1,
2309           .bInterfaceProtocol   = 0,
2310           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2311                                 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2312         /* Ecamm Pico iMage */
2313         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2314                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2315           .idVendor             = 0x18cd,
2316           .idProduct            = 0xcafe,
2317           .bInterfaceClass      = USB_CLASS_VIDEO,
2318           .bInterfaceSubClass   = 1,
2319           .bInterfaceProtocol   = 0,
2320           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
2321         /* Manta MM-353 Plako */
2322         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2323                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2324           .idVendor             = 0x18ec,
2325           .idProduct            = 0x3188,
2326           .bInterfaceClass      = USB_CLASS_VIDEO,
2327           .bInterfaceSubClass   = 1,
2328           .bInterfaceProtocol   = 0,
2329           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2330         /* FSC WebCam V30S */
2331         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2332                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2333           .idVendor             = 0x18ec,
2334           .idProduct            = 0x3288,
2335           .bInterfaceClass      = USB_CLASS_VIDEO,
2336           .bInterfaceSubClass   = 1,
2337           .bInterfaceProtocol   = 0,
2338           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2339         /* Arkmicro unbranded */
2340         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2341                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2342           .idVendor             = 0x18ec,
2343           .idProduct            = 0x3290,
2344           .bInterfaceClass      = USB_CLASS_VIDEO,
2345           .bInterfaceSubClass   = 1,
2346           .bInterfaceProtocol   = 0,
2347           .driver_info          = UVC_QUIRK_PROBE_DEF },
2348         /* The Imaging Source USB CCD cameras */
2349         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2350                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2351           .idVendor             = 0x199e,
2352           .idProduct            = 0x8102,
2353           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2354           .bInterfaceSubClass   = 1,
2355           .bInterfaceProtocol   = 0 },
2356         /* Bodelin ProScopeHR */
2357         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2358                                 | USB_DEVICE_ID_MATCH_DEV_HI
2359                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2360           .idVendor             = 0x19ab,
2361           .idProduct            = 0x1000,
2362           .bcdDevice_hi         = 0x0126,
2363           .bInterfaceClass      = USB_CLASS_VIDEO,
2364           .bInterfaceSubClass   = 1,
2365           .bInterfaceProtocol   = 0,
2366           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
2367         /* MSI StarCam 370i */
2368         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2369                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2370           .idVendor             = 0x1b3b,
2371           .idProduct            = 0x2951,
2372           .bInterfaceClass      = USB_CLASS_VIDEO,
2373           .bInterfaceSubClass   = 1,
2374           .bInterfaceProtocol   = 0,
2375           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2376         /* SiGma Micro USB Web Camera */
2377         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2378                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2379           .idVendor             = 0x1c4f,
2380           .idProduct            = 0x3000,
2381           .bInterfaceClass      = USB_CLASS_VIDEO,
2382           .bInterfaceSubClass   = 1,
2383           .bInterfaceProtocol   = 0,
2384           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2385                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2386         /* Generic USB Video Class */
2387         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
2388         {}
2389 };
2390
2391 MODULE_DEVICE_TABLE(usb, uvc_ids);
2392
2393 struct uvc_driver uvc_driver = {
2394         .driver = {
2395                 .name           = "uvcvideo",
2396                 .probe          = uvc_probe,
2397                 .disconnect     = uvc_disconnect,
2398                 .suspend        = uvc_suspend,
2399                 .resume         = uvc_resume,
2400                 .reset_resume   = uvc_reset_resume,
2401                 .id_table       = uvc_ids,
2402                 .supports_autosuspend = 1,
2403         },
2404 };
2405
2406 static int __init uvc_init(void)
2407 {
2408         int result;
2409
2410         result = usb_register(&uvc_driver.driver);
2411         if (result == 0)
2412                 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2413         return result;
2414 }
2415
2416 static void __exit uvc_cleanup(void)
2417 {
2418         usb_deregister(&uvc_driver.driver);
2419 }
2420
2421 module_init(uvc_init);
2422 module_exit(uvc_cleanup);
2423
2424 MODULE_AUTHOR(DRIVER_AUTHOR);
2425 MODULE_DESCRIPTION(DRIVER_DESC);
2426 MODULE_LICENSE("GPL");
2427 MODULE_VERSION(DRIVER_VERSION);
2428