drivers/media/usb/uvc/uvc_driver.c

   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 /*
  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/atomic.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/slab.h>
  31 #include <linux/usb.h>
  32 #include <linux/videodev2.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/wait.h>
  35 #include <linux/version.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 (Y800)",
  99                 .guid           = UVC_GUID_FORMAT_Y800,
 100                 .fcc            = V4L2_PIX_FMT_GREY,
 101         },
 102         {
 103                 .name           = "Greyscale 8-bit (Y8  )",
 104                 .guid           = UVC_GUID_FORMAT_Y8,
 105                 .fcc            = V4L2_PIX_FMT_GREY,
 106         },
 107         {
 108                 .name           = "Greyscale 10-bit (Y10 )",
 109                 .guid           = UVC_GUID_FORMAT_Y10,
 110                 .fcc            = V4L2_PIX_FMT_Y10,
 111         },
 112         {
 113                 .name           = "Greyscale 12-bit (Y12 )",
 114                 .guid           = UVC_GUID_FORMAT_Y12,
 115                 .fcc            = V4L2_PIX_FMT_Y12,
 116         },
 117         {
 118                 .name           = "Greyscale 16-bit (Y16 )",
 119                 .guid           = UVC_GUID_FORMAT_Y16,
 120                 .fcc            = V4L2_PIX_FMT_Y16,
 121         },
 122         {
 123                 .name           = "RGB Bayer",
 124                 .guid           = UVC_GUID_FORMAT_BY8,
 125                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 126         },
 127         {
 128                 .name           = "RGB565",
 129                 .guid           = UVC_GUID_FORMAT_RGBP,
 130                 .fcc            = V4L2_PIX_FMT_RGB565,
 131         },
 132         {
 133                 .name           = "H.264",
 134                 .guid           = UVC_GUID_FORMAT_H264,
 135                 .fcc            = V4L2_PIX_FMT_H264,
 136         },
 137 };
 138
 139 /* ------------------------------------------------------------------------
 140  * Utility functions
 141  */
 142
 143 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 144                 __u8 epaddr)
 145 {
 146         struct usb_host_endpoint *ep;
 147         unsigned int i;
 148
 149         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 150                 ep = &alts->endpoint[i];
 151                 if (ep->desc.bEndpointAddress == epaddr)
 152                         return ep;
 153         }
 154
 155         return NULL;
 156 }
 157
 158 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 159 {
 160         unsigned int len = ARRAY_SIZE(uvc_fmts);
 161         unsigned int i;
 162
 163         for (i = 0; i < len; ++i) {
 164                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 165                         return &uvc_fmts[i];
 166         }
 167
 168         return NULL;
 169 }
 170
 171 static __u32 uvc_colorspace(const __u8 primaries)
 172 {
 173         static const __u8 colorprimaries[] = {
 174                 0,
 175                 V4L2_COLORSPACE_SRGB,
 176                 V4L2_COLORSPACE_470_SYSTEM_M,
 177                 V4L2_COLORSPACE_470_SYSTEM_BG,
 178                 V4L2_COLORSPACE_SMPTE170M,
 179                 V4L2_COLORSPACE_SMPTE240M,
 180         };
 181
 182         if (primaries < ARRAY_SIZE(colorprimaries))
 183                 return colorprimaries[primaries];
 184
 185         return 0;
 186 }
 187
 188 /* Simplify a fraction using a simple continued fraction decomposition. The
 189  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 190  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 191  * arbitrary parameters to remove non-significative terms from the simple
 192  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 193  * respectively seems to give nice results.
 194  */
 195 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 196                 unsigned int n_terms, unsigned int threshold)
 197 {
 198         uint32_t *an;
 199         uint32_t x, y, r;
 200         unsigned int i, n;
 201
 202         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 203         if (an == NULL)
 204                 return;
 205
 206         /* Convert the fraction to a simple continued fraction. See
 207          * http://mathforum.org/dr.math/faq/faq.fractions.html
 208          * Stop if the current term is bigger than or equal to the given
 209          * threshold.
 210          */
 211         x = *numerator;
 212         y = *denominator;
 213
 214         for (n = 0; n < n_terms && y != 0; ++n) {
 215                 an[n] = x / y;
 216                 if (an[n] >= threshold) {
 217                         if (n < 2)
 218                                 n++;
 219                         break;
 220                 }
 221
 222                 r = x - an[n] * y;
 223                 x = y;
 224                 y = r;
 225         }
 226
 227         /* Expand the simple continued fraction back to an integer fraction. */
 228         x = 0;
 229         y = 1;
 230
 231         for (i = n; i > 0; --i) {
 232                 r = y;
 233                 y = an[i-1] * y + x;
 234                 x = r;
 235         }
 236
 237         *numerator = y;
 238         *denominator = x;
 239         kfree(an);
 240 }
 241
 242 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 243  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 244  * arithmetic only.
 245  */
 246 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 247 {
 248         uint32_t multiplier;
 249
 250         /* Saturate the result if the operation would overflow. */
 251         if (denominator == 0 ||
 252             numerator/denominator >= ((uint32_t)-1)/10000000)
 253                 return (uint32_t)-1;
 254
 255         /* Divide both the denominator and the multiplier by two until
 256          * numerator * multiplier doesn't overflow. If anyone knows a better
 257          * algorithm please let me know.
 258          */
 259         multiplier = 10000000;
 260         while (numerator > ((uint32_t)-1)/multiplier) {
 261                 multiplier /= 2;
 262                 denominator /= 2;
 263         }
 264
 265         return denominator ? numerator * multiplier / denominator : 0;
 266 }
 267
 268 /* ------------------------------------------------------------------------
 269  * Terminal and unit management
 270  */
 271
 272 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 273 {
 274         struct uvc_entity *entity;
 275
 276         list_for_each_entry(entity, &dev->entities, list) {
 277                 if (entity->id == id)
 278                         return entity;
 279         }
 280
 281         return NULL;
 282 }
 283
 284 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 285         int id, struct uvc_entity *entity)
 286 {
 287         unsigned int i;
 288
 289         if (entity == NULL)
 290                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 291
 292         list_for_each_entry_continue(entity, &dev->entities, list) {
 293                 for (i = 0; i < entity->bNrInPins; ++i)
 294                         if (entity->baSourceID[i] == id)
 295                                 return entity;
 296         }
 297
 298         return NULL;
 299 }
 300
 301 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 302 {
 303         struct uvc_streaming *stream;
 304
 305         list_for_each_entry(stream, &dev->streams, list) {
 306                 if (stream->header.bTerminalLink == id)
 307                         return stream;
 308         }
 309
 310         return NULL;
 311 }
 312
 313 /* ------------------------------------------------------------------------
 314  * Descriptors parsing
 315  */
 316
 317 static int uvc_parse_format(struct uvc_device *dev,
 318         struct uvc_streaming *streaming, struct uvc_format *format,
 319         __u32 **intervals, unsigned char *buffer, int buflen)
 320 {
 321         struct usb_interface *intf = streaming->intf;
 322         struct usb_host_interface *alts = intf->cur_altsetting;
 323         struct uvc_format_desc *fmtdesc;
 324         struct uvc_frame *frame;
 325         const unsigned char *start = buffer;
 326         unsigned int interval;
 327         unsigned int i, n;
 328         __u8 ftype;
 329
 330         format->type = buffer[2];
 331         format->index = buffer[3];
 332
 333         switch (buffer[2]) {
 334         case UVC_VS_FORMAT_UNCOMPRESSED:
 335         case UVC_VS_FORMAT_FRAME_BASED:
 336                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 337                 if (buflen < n) {
 338                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 339                                "interface %d FORMAT error\n",
 340                                dev->udev->devnum,
 341                                alts->desc.bInterfaceNumber);
 342                         return -EINVAL;
 343                 }
 344
 345                 /* Find the format descriptor from its GUID. */
 346                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 347
 348                 if (fmtdesc != NULL) {
 349                         strlcpy(format->name, fmtdesc->name,
 350                                 sizeof format->name);
 351                         format->fcc = fmtdesc->fcc;
 352                 } else {
 353                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 354                                 &buffer[5]);
 355                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 356                                 &buffer[5]);
 357                         format->fcc = 0;
 358                 }
 359
 360                 format->bpp = buffer[21];
 361                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 362                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 363                 } else {
 364                         ftype = UVC_VS_FRAME_FRAME_BASED;
 365                         if (buffer[27])
 366                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 367                 }
 368                 break;
 369
 370         case UVC_VS_FORMAT_MJPEG:
 371                 if (buflen < 11) {
 372                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 373                                "interface %d FORMAT error\n",
 374                                dev->udev->devnum,
 375                                alts->desc.bInterfaceNumber);
 376                         return -EINVAL;
 377                 }
 378
 379                 strlcpy(format->name, "MJPEG", sizeof format->name);
 380                 format->fcc = V4L2_PIX_FMT_MJPEG;
 381                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 382                 format->bpp = 0;
 383                 ftype = UVC_VS_FRAME_MJPEG;
 384                 break;
 385
 386         case UVC_VS_FORMAT_DV:
 387                 if (buflen < 9) {
 388                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 389                                "interface %d FORMAT error\n",
 390                                dev->udev->devnum,
 391                                alts->desc.bInterfaceNumber);
 392                         return -EINVAL;
 393                 }
 394
 395                 switch (buffer[8] & 0x7f) {
 396                 case 0:
 397                         strlcpy(format->name, "SD-DV", sizeof format->name);
 398                         break;
 399                 case 1:
 400                         strlcpy(format->name, "SDL-DV", sizeof format->name);
 401                         break;
 402                 case 2:
 403                         strlcpy(format->name, "HD-DV", sizeof format->name);
 404                         break;
 405                 default:
 406                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 407                                "interface %d: unknown DV format %u\n",
 408                                dev->udev->devnum,
 409                                alts->desc.bInterfaceNumber, buffer[8]);
 410                         return -EINVAL;
 411                 }
 412
 413                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 414                         sizeof format->name);
 415
 416                 format->fcc = V4L2_PIX_FMT_DV;
 417                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 418                 format->bpp = 0;
 419                 ftype = 0;
 420
 421                 /* Create a dummy frame descriptor. */
 422                 frame = &format->frame[0];
 423                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 424                 frame->bFrameIntervalType = 1;
 425                 frame->dwDefaultFrameInterval = 1;
 426                 frame->dwFrameInterval = *intervals;
 427                 *(*intervals)++ = 1;
 428                 format->nframes = 1;
 429                 break;
 430
 431         case UVC_VS_FORMAT_MPEG2TS:
 432         case UVC_VS_FORMAT_STREAM_BASED:
 433                 /* Not supported yet. */
 434         default:
 435                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 436                        "interface %d unsupported format %u\n",
 437                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 438                        buffer[2]);
 439                 return -EINVAL;
 440         }
 441
 442         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 443
 444         buflen -= buffer[0];
 445         buffer += buffer[0];
 446
 447         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 448          * based formats have frame descriptors.
 449          */
 450         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 451                buffer[2] == ftype) {
 452                 frame = &format->frame[format->nframes];
 453                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 454                         n = buflen > 25 ? buffer[25] : 0;
 455                 else
 456                         n = buflen > 21 ? buffer[21] : 0;
 457
 458                 n = n ? n : 3;
 459
 460                 if (buflen < 26 + 4*n) {
 461                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 462                                "interface %d FRAME error\n", dev->udev->devnum,
 463                                alts->desc.bInterfaceNumber);
 464                         return -EINVAL;
 465                 }
 466
 467                 frame->bFrameIndex = buffer[3];
 468                 frame->bmCapabilities = buffer[4];
 469                 frame->wWidth = get_unaligned_le16(&buffer[5]);
 470                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 471                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 472                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 473                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 474                         frame->dwMaxVideoFrameBufferSize =
 475                                 get_unaligned_le32(&buffer[17]);
 476                         frame->dwDefaultFrameInterval =
 477                                 get_unaligned_le32(&buffer[21]);
 478                         frame->bFrameIntervalType = buffer[25];
 479                 } else {
 480                         frame->dwMaxVideoFrameBufferSize = 0;
 481                         frame->dwDefaultFrameInterval =
 482                                 get_unaligned_le32(&buffer[17]);
 483                         frame->bFrameIntervalType = buffer[21];
 484                 }
 485                 frame->dwFrameInterval = *intervals;
 486
 487                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 488                  * completely. Observed behaviours range from setting the
 489                  * value to 1.1x the actual frame size to hardwiring the
 490                  * 16 low bits to 0. This results in a higher than necessary
 491                  * memory usage as well as a wrong image size information. For
 492                  * uncompressed formats this can be fixed by computing the
 493                  * value from the frame size.
 494                  */
 495                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 496                         frame->dwMaxVideoFrameBufferSize = format->bpp
 497                                 * frame->wWidth * frame->wHeight / 8;
 498
 499                 /* Some bogus devices report dwMinFrameInterval equal to
 500                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 501                  * zero. Setting all null intervals to 1 fixes the problem and
 502                  * some other divisions by zero that could happen.
 503                  */
 504                 for (i = 0; i < n; ++i) {
 505                         interval = get_unaligned_le32(&buffer[26+4*i]);
 506                         *(*intervals)++ = interval ? interval : 1;
 507                 }
 508
 509                 /* Make sure that the default frame interval stays between
 510                  * the boundaries.
 511                  */
 512                 n -= frame->bFrameIntervalType ? 1 : 2;
 513                 frame->dwDefaultFrameInterval =
 514                         min(frame->dwFrameInterval[n],
 515                             max(frame->dwFrameInterval[0],
 516                                 frame->dwDefaultFrameInterval));
 517
 518                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 519                         frame->bFrameIntervalType = 1;
 520                         frame->dwFrameInterval[0] =
 521                                 frame->dwDefaultFrameInterval;
 522                 }
 523
 524                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 525                         frame->wWidth, frame->wHeight,
 526                         10000000/frame->dwDefaultFrameInterval,
 527                         (100000000/frame->dwDefaultFrameInterval)%10);
 528
 529                 format->nframes++;
 530                 buflen -= buffer[0];
 531                 buffer += buffer[0];
 532         }
 533
 534         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 535             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 536                 buflen -= buffer[0];
 537                 buffer += buffer[0];
 538         }
 539
 540         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 541             buffer[2] == UVC_VS_COLORFORMAT) {
 542                 if (buflen < 6) {
 543                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 544                                "interface %d COLORFORMAT error\n",
 545                                dev->udev->devnum,
 546                                alts->desc.bInterfaceNumber);
 547                         return -EINVAL;
 548                 }
 549
 550                 format->colorspace = uvc_colorspace(buffer[3]);
 551
 552                 buflen -= buffer[0];
 553                 buffer += buffer[0];
 554         }
 555
 556         return buffer - start;
 557 }
 558
 559 static int uvc_parse_streaming(struct uvc_device *dev,
 560         struct usb_interface *intf)
 561 {
 562         struct uvc_streaming *streaming = NULL;
 563         struct uvc_format *format;
 564         struct uvc_frame *frame;
 565         struct usb_host_interface *alts = &intf->altsetting[0];
 566         unsigned char *_buffer, *buffer = alts->extra;
 567         int _buflen, buflen = alts->extralen;
 568         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 569         unsigned int size, i, n, p;
 570         __u32 *interval;
 571         __u16 psize;
 572         int ret = -EINVAL;
 573
 574         if (intf->cur_altsetting->desc.bInterfaceSubClass
 575                 != UVC_SC_VIDEOSTREAMING) {
 576                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 577                         "video streaming interface\n", dev->udev->devnum,
 578                         intf->altsetting[0].desc.bInterfaceNumber);
 579                 return -EINVAL;
 580         }
 581
 582         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 583                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 584                         "claimed\n", dev->udev->devnum,
 585                         intf->altsetting[0].desc.bInterfaceNumber);
 586                 return -EINVAL;
 587         }
 588
 589         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 590         if (streaming == NULL) {
 591                 usb_driver_release_interface(&uvc_driver.driver, intf);
 592                 return -EINVAL;
 593         }
 594
 595         mutex_init(&streaming->mutex);
 596         streaming->dev = dev;
 597         streaming->intf = usb_get_intf(intf);
 598         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 599
 600         /* The Pico iMage webcam has its class-specific interface descriptors
 601          * after the endpoint descriptors.
 602          */
 603         if (buflen == 0) {
 604                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 605                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 606
 607                         if (ep->extralen == 0)
 608                                 continue;
 609
 610                         if (ep->extralen > 2 &&
 611                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 612                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 613                                         "from endpoint %u.\n", i);
 614                                 buffer = alts->endpoint[i].extra;
 615                                 buflen = alts->endpoint[i].extralen;
 616                                 break;
 617                         }
 618                 }
 619         }
 620
 621         /* Skip the standard interface descriptors. */
 622         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 623                 buflen -= buffer[0];
 624                 buffer += buffer[0];
 625         }
 626
 627         if (buflen <= 2) {
 628                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 629                         "interface descriptors found.\n");
 630                 goto error;
 631         }
 632
 633         /* Parse the header descriptor. */
 634         switch (buffer[2]) {
 635         case UVC_VS_OUTPUT_HEADER:
 636                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 637                 size = 9;
 638                 break;
 639
 640         case UVC_VS_INPUT_HEADER:
 641                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 642                 size = 13;
 643                 break;
 644
 645         default:
 646                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 647                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 648                         alts->desc.bInterfaceNumber);
 649                 goto error;
 650         }
 651
 652         p = buflen >= 4 ? buffer[3] : 0;
 653         n = buflen >= size ? buffer[size-1] : 0;
 654
 655         if (buflen < size + p*n) {
 656                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 657                         "interface %d HEADER descriptor is invalid.\n",
 658                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 659                 goto error;
 660         }
 661
 662         streaming->header.bNumFormats = p;
 663         streaming->header.bEndpointAddress = buffer[6];
 664         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 665                 streaming->header.bmInfo = buffer[7];
 666                 streaming->header.bTerminalLink = buffer[8];
 667                 streaming->header.bStillCaptureMethod = buffer[9];
 668                 streaming->header.bTriggerSupport = buffer[10];
 669                 streaming->header.bTriggerUsage = buffer[11];
 670         } else {
 671                 streaming->header.bTerminalLink = buffer[7];
 672         }
 673         streaming->header.bControlSize = n;
 674
 675         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 676                                                 GFP_KERNEL);
 677         if (streaming->header.bmaControls == NULL) {
 678                 ret = -ENOMEM;
 679                 goto error;
 680         }
 681
 682         buflen -= buffer[0];
 683         buffer += buffer[0];
 684
 685         _buffer = buffer;
 686         _buflen = buflen;
 687
 688         /* Count the format and frame descriptors. */
 689         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 690                 switch (_buffer[2]) {
 691                 case UVC_VS_FORMAT_UNCOMPRESSED:
 692                 case UVC_VS_FORMAT_MJPEG:
 693                 case UVC_VS_FORMAT_FRAME_BASED:
 694                         nformats++;
 695                         break;
 696
 697                 case UVC_VS_FORMAT_DV:
 698                         /* DV format has no frame descriptor. We will create a
 699                          * dummy frame descriptor with a dummy frame interval.
 700                          */
 701                         nformats++;
 702                         nframes++;
 703                         nintervals++;
 704                         break;
 705
 706                 case UVC_VS_FORMAT_MPEG2TS:
 707                 case UVC_VS_FORMAT_STREAM_BASED:
 708                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 709                                 "interface %d FORMAT %u is not supported.\n",
 710                                 dev->udev->devnum,
 711                                 alts->desc.bInterfaceNumber, _buffer[2]);
 712                         break;
 713
 714                 case UVC_VS_FRAME_UNCOMPRESSED:
 715                 case UVC_VS_FRAME_MJPEG:
 716                         nframes++;
 717                         if (_buflen > 25)
 718                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 719                         break;
 720
 721                 case UVC_VS_FRAME_FRAME_BASED:
 722                         nframes++;
 723                         if (_buflen > 21)
 724                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 725                         break;
 726                 }
 727
 728                 _buflen -= _buffer[0];
 729                 _buffer += _buffer[0];
 730         }
 731
 732         if (nformats == 0) {
 733                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 734                         "%d has no supported formats defined.\n",
 735                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 736                 goto error;
 737         }
 738
 739         size = nformats * sizeof *format + nframes * sizeof *frame
 740              + nintervals * sizeof *interval;
 741         format = kzalloc(size, GFP_KERNEL);
 742         if (format == NULL) {
 743                 ret = -ENOMEM;
 744                 goto error;
 745         }
 746
 747         frame = (struct uvc_frame *)&format[nformats];
 748         interval = (__u32 *)&frame[nframes];
 749
 750         streaming->format = format;
 751         streaming->nformats = nformats;
 752
 753         /* Parse the format descriptors. */
 754         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 755                 switch (buffer[2]) {
 756                 case UVC_VS_FORMAT_UNCOMPRESSED:
 757                 case UVC_VS_FORMAT_MJPEG:
 758                 case UVC_VS_FORMAT_DV:
 759                 case UVC_VS_FORMAT_FRAME_BASED:
 760                         format->frame = frame;
 761                         ret = uvc_parse_format(dev, streaming, format,
 762                                 &interval, buffer, buflen);
 763                         if (ret < 0)
 764                                 goto error;
 765
 766                         frame += format->nframes;
 767                         format++;
 768
 769                         buflen -= ret;
 770                         buffer += ret;
 771                         continue;
 772
 773                 default:
 774                         break;
 775                 }
 776
 777                 buflen -= buffer[0];
 778                 buffer += buffer[0];
 779         }
 780
 781         if (buflen)
 782                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 783                         "%d has %u bytes of trailing descriptor garbage.\n",
 784                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 785
 786         /* Parse the alternate settings to find the maximum bandwidth. */
 787         for (i = 0; i < intf->num_altsetting; ++i) {
 788                 struct usb_host_endpoint *ep;
 789                 alts = &intf->altsetting[i];
 790                 ep = uvc_find_endpoint(alts,
 791                                 streaming->header.bEndpointAddress);
 792                 if (ep == NULL)
 793                         continue;
 794
 795                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 796                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 797                 if (psize > streaming->maxpsize)
 798                         streaming->maxpsize = psize;
 799         }
 800
 801         list_add_tail(&streaming->list, &dev->streams);
 802         return 0;
 803
 804 error:
 805         usb_driver_release_interface(&uvc_driver.driver, intf);
 806         usb_put_intf(intf);
 807         kfree(streaming->format);
 808         kfree(streaming->header.bmaControls);
 809         kfree(streaming);
 810         return ret;
 811 }
 812
 813 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 814                 unsigned int num_pads, unsigned int extra_size)
 815 {
 816         struct uvc_entity *entity;
 817         unsigned int num_inputs;
 818         unsigned int size;
 819         unsigned int i;
 820
 821         extra_size = ALIGN(extra_size, sizeof(*entity->pads));
 822         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 823         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 824              + num_inputs;
 825         entity = kzalloc(size, GFP_KERNEL);
 826         if (entity == NULL)
 827                 return NULL;
 828
 829         entity->id = id;
 830         entity->type = type;
 831
 832         entity->num_links = 0;
 833         entity->num_pads = num_pads;
 834         entity->pads = ((void *)(entity + 1)) + extra_size;
 835
 836         for (i = 0; i < num_inputs; ++i)
 837                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 838         if (!UVC_ENTITY_IS_OTERM(entity))
 839                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 840
 841         entity->bNrInPins = num_inputs;
 842         entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
 843
 844         return entity;
 845 }
 846
 847 /* Parse vendor-specific extensions. */
 848 static int uvc_parse_vendor_control(struct uvc_device *dev,
 849         const unsigned char *buffer, int buflen)
 850 {
 851         struct usb_device *udev = dev->udev;
 852         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 853         struct uvc_entity *unit;
 854         unsigned int n, p;
 855         int handled = 0;
 856
 857         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 858         case 0x046d:            /* Logitech */
 859                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 860                         break;
 861
 862                 /* Logitech implements several vendor specific functions
 863                  * through vendor specific extension units (LXU).
 864                  *
 865                  * The LXU descriptors are similar to XU descriptors
 866                  * (see "USB Device Video Class for Video Devices", section
 867                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 868                  * differences:
 869                  *
 870                  * ----------------------------------------------------------
 871                  * 0            bLength         1        Number
 872                  *      Size of this descriptor, in bytes: 24+p+n*2
 873                  * ----------------------------------------------------------
 874                  * 23+p+n       bmControlsType  N       Bitmap
 875                  *      Individual bits in the set are defined:
 876                  *      0: Absolute
 877                  *      1: Relative
 878                  *
 879                  *      This bitset is mapped exactly the same as bmControls.
 880                  * ----------------------------------------------------------
 881                  * 23+p+n*2     bReserved       1       Boolean
 882                  * ----------------------------------------------------------
 883                  * 24+p+n*2     iExtension      1       Index
 884                  *      Index of a string descriptor that describes this
 885                  *      extension unit.
 886                  * ----------------------------------------------------------
 887                  */
 888                 p = buflen >= 22 ? buffer[21] : 0;
 889                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 890
 891                 if (buflen < 25 + p + 2*n) {
 892                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 893                                 "interface %d EXTENSION_UNIT error\n",
 894                                 udev->devnum, alts->desc.bInterfaceNumber);
 895                         break;
 896                 }
 897
 898                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
 899                                         p + 1, 2*n);
 900                 if (unit == NULL)
 901                         return -ENOMEM;
 902
 903                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 904                 unit->extension.bNumControls = buffer[20];
 905                 memcpy(unit->baSourceID, &buffer[22], p);
 906                 unit->extension.bControlSize = buffer[22+p];
 907                 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
 908                 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
 909                                                + n;
 910                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 911
 912                 if (buffer[24+p+2*n] != 0)
 913                         usb_string(udev, buffer[24+p+2*n], unit->name,
 914                                    sizeof unit->name);
 915                 else
 916                         sprintf(unit->name, "Extension %u", buffer[3]);
 917
 918                 list_add_tail(&unit->list, &dev->entities);
 919                 handled = 1;
 920                 break;
 921         }
 922
 923         return handled;
 924 }
 925
 926 static int uvc_parse_standard_control(struct uvc_device *dev,
 927         const unsigned char *buffer, int buflen)
 928 {
 929         struct usb_device *udev = dev->udev;
 930         struct uvc_entity *unit, *term;
 931         struct usb_interface *intf;
 932         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 933         unsigned int i, n, p, len;
 934         __u16 type;
 935
 936         switch (buffer[2]) {
 937         case UVC_VC_HEADER:
 938                 n = buflen >= 12 ? buffer[11] : 0;
 939
 940                 if (buflen < 12 || buflen < 12 + n) {
 941                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 942                                 "interface %d HEADER error\n", udev->devnum,
 943                                 alts->desc.bInterfaceNumber);
 944                         return -EINVAL;
 945                 }
 946
 947                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 948                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 949
 950                 /* Parse all USB Video Streaming interfaces. */
 951                 for (i = 0; i < n; ++i) {
 952                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 953                         if (intf == NULL) {
 954                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 955                                         "interface %d doesn't exists\n",
 956                                         udev->devnum, i);
 957                                 continue;
 958                         }
 959
 960                         uvc_parse_streaming(dev, intf);
 961                 }
 962                 break;
 963
 964         case UVC_VC_INPUT_TERMINAL:
 965                 if (buflen < 8) {
 966                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 967                                 "interface %d INPUT_TERMINAL error\n",
 968                                 udev->devnum, alts->desc.bInterfaceNumber);
 969                         return -EINVAL;
 970                 }
 971
 972                 /* Make sure the terminal type MSB is not null, otherwise it
 973                  * could be confused with a unit.
 974                  */
 975                 type = get_unaligned_le16(&buffer[4]);
 976                 if ((type & 0xff00) == 0) {
 977                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 978                                 "interface %d INPUT_TERMINAL %d has invalid "
 979                                 "type 0x%04x, skipping\n", udev->devnum,
 980                                 alts->desc.bInterfaceNumber,
 981                                 buffer[3], type);
 982                         return 0;
 983                 }
 984
 985                 n = 0;
 986                 p = 0;
 987                 len = 8;
 988
 989                 if (type == UVC_ITT_CAMERA) {
 990                         n = buflen >= 15 ? buffer[14] : 0;
 991                         len = 15;
 992
 993                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
 994                         n = buflen >= 9 ? buffer[8] : 0;
 995                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 996                         len = 10;
 997                 }
 998
 999                 if (buflen < len + n + p) {
1000                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1001                                 "interface %d INPUT_TERMINAL error\n",
1002                                 udev->devnum, alts->desc.bInterfaceNumber);
1003                         return -EINVAL;
1004                 }
1005
1006                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
1007                                         1, n + p);
1008                 if (term == NULL)
1009                         return -ENOMEM;
1010
1011                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1012                         term->camera.bControlSize = n;
1013                         term->camera.bmControls = (__u8 *)term + sizeof *term;
1014                         term->camera.wObjectiveFocalLengthMin =
1015                                 get_unaligned_le16(&buffer[8]);
1016                         term->camera.wObjectiveFocalLengthMax =
1017                                 get_unaligned_le16(&buffer[10]);
1018                         term->camera.wOcularFocalLength =
1019                                 get_unaligned_le16(&buffer[12]);
1020                         memcpy(term->camera.bmControls, &buffer[15], n);
1021                 } else if (UVC_ENTITY_TYPE(term) ==
1022                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1023                         term->media.bControlSize = n;
1024                         term->media.bmControls = (__u8 *)term + sizeof *term;
1025                         term->media.bTransportModeSize = p;
1026                         term->media.bmTransportModes = (__u8 *)term
1027                                                      + sizeof *term + n;
1028                         memcpy(term->media.bmControls, &buffer[9], n);
1029                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1030                 }
1031
1032                 if (buffer[7] != 0)
1033                         usb_string(udev, buffer[7], term->name,
1034                                    sizeof term->name);
1035                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1036                         sprintf(term->name, "Camera %u", buffer[3]);
1037                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1038                         sprintf(term->name, "Media %u", buffer[3]);
1039                 else
1040                         sprintf(term->name, "Input %u", buffer[3]);
1041
1042                 list_add_tail(&term->list, &dev->entities);
1043                 break;
1044
1045         case UVC_VC_OUTPUT_TERMINAL:
1046                 if (buflen < 9) {
1047                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1048                                 "interface %d OUTPUT_TERMINAL error\n",
1049                                 udev->devnum, alts->desc.bInterfaceNumber);
1050                         return -EINVAL;
1051                 }
1052
1053                 /* Make sure the terminal type MSB is not null, otherwise it
1054                  * could be confused with a unit.
1055                  */
1056                 type = get_unaligned_le16(&buffer[4]);
1057                 if ((type & 0xff00) == 0) {
1058                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1059                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1060                                 "type 0x%04x, skipping\n", udev->devnum,
1061                                 alts->desc.bInterfaceNumber, buffer[3], type);
1062                         return 0;
1063                 }
1064
1065                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1066                                         1, 0);
1067                 if (term == NULL)
1068                         return -ENOMEM;
1069
1070                 memcpy(term->baSourceID, &buffer[7], 1);
1071
1072                 if (buffer[8] != 0)
1073                         usb_string(udev, buffer[8], term->name,
1074                                    sizeof term->name);
1075                 else
1076                         sprintf(term->name, "Output %u", buffer[3]);
1077
1078                 list_add_tail(&term->list, &dev->entities);
1079                 break;
1080
1081         case UVC_VC_SELECTOR_UNIT:
1082                 p = buflen >= 5 ? buffer[4] : 0;
1083
1084                 if (buflen < 5 || buflen < 6 + p) {
1085                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1086                                 "interface %d SELECTOR_UNIT error\n",
1087                                 udev->devnum, alts->desc.bInterfaceNumber);
1088                         return -EINVAL;
1089                 }
1090
1091                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1092                 if (unit == NULL)
1093                         return -ENOMEM;
1094
1095                 memcpy(unit->baSourceID, &buffer[5], p);
1096
1097                 if (buffer[5+p] != 0)
1098                         usb_string(udev, buffer[5+p], unit->name,
1099                                    sizeof unit->name);
1100                 else
1101                         sprintf(unit->name, "Selector %u", buffer[3]);
1102
1103                 list_add_tail(&unit->list, &dev->entities);
1104                 break;
1105
1106         case UVC_VC_PROCESSING_UNIT:
1107                 n = buflen >= 8 ? buffer[7] : 0;
1108                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1109
1110                 if (buflen < p + n) {
1111                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1112                                 "interface %d PROCESSING_UNIT error\n",
1113                                 udev->devnum, alts->desc.bInterfaceNumber);
1114                         return -EINVAL;
1115                 }
1116
1117                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1118                 if (unit == NULL)
1119                         return -ENOMEM;
1120
1121                 memcpy(unit->baSourceID, &buffer[4], 1);
1122                 unit->processing.wMaxMultiplier =
1123                         get_unaligned_le16(&buffer[5]);
1124                 unit->processing.bControlSize = buffer[7];
1125                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1126                 memcpy(unit->processing.bmControls, &buffer[8], n);
1127                 if (dev->uvc_version >= 0x0110)
1128                         unit->processing.bmVideoStandards = buffer[9+n];
1129
1130                 if (buffer[8+n] != 0)
1131                         usb_string(udev, buffer[8+n], unit->name,
1132                                    sizeof unit->name);
1133                 else
1134                         sprintf(unit->name, "Processing %u", buffer[3]);
1135
1136                 list_add_tail(&unit->list, &dev->entities);
1137                 break;
1138
1139         case UVC_VC_EXTENSION_UNIT:
1140                 p = buflen >= 22 ? buffer[21] : 0;
1141                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1142
1143                 if (buflen < 24 + p + n) {
1144                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1145                                 "interface %d EXTENSION_UNIT error\n",
1146                                 udev->devnum, alts->desc.bInterfaceNumber);
1147                         return -EINVAL;
1148                 }
1149
1150                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1151                 if (unit == NULL)
1152                         return -ENOMEM;
1153
1154                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1155                 unit->extension.bNumControls = buffer[20];
1156                 memcpy(unit->baSourceID, &buffer[22], p);
1157                 unit->extension.bControlSize = buffer[22+p];
1158                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1159                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1160
1161                 if (buffer[23+p+n] != 0)
1162                         usb_string(udev, buffer[23+p+n], unit->name,
1163                                    sizeof unit->name);
1164                 else
1165                         sprintf(unit->name, "Extension %u", buffer[3]);
1166
1167                 list_add_tail(&unit->list, &dev->entities);
1168                 break;
1169
1170         default:
1171                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1172                         "descriptor (%u)\n", buffer[2]);
1173                 break;
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int uvc_parse_control(struct uvc_device *dev)
1180 {
1181         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1182         unsigned char *buffer = alts->extra;
1183         int buflen = alts->extralen;
1184         int ret;
1185
1186         /* Parse the default alternate setting only, as the UVC specification
1187          * defines a single alternate setting, the default alternate setting
1188          * zero.
1189          */
1190
1191         while (buflen > 2) {
1192                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1193                     buffer[1] != USB_DT_CS_INTERFACE)
1194                         goto next_descriptor;
1195
1196                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1197                         return ret;
1198
1199 next_descriptor:
1200                 buflen -= buffer[0];
1201                 buffer += buffer[0];
1202         }
1203
1204         /* Check if the optional status endpoint is present. Built-in iSight
1205          * webcams have an interrupt endpoint but spit proprietary data that
1206          * don't conform to the UVC status endpoint messages. Don't try to
1207          * handle the interrupt endpoint for those cameras.
1208          */
1209         if (alts->desc.bNumEndpoints == 1 &&
1210             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1211                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1212                 struct usb_endpoint_descriptor *desc = &ep->desc;
1213
1214                 if (usb_endpoint_is_int_in(desc) &&
1215                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1216                     desc->bInterval != 0) {
1217                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1218                                 "(addr %02x).\n", desc->bEndpointAddress);
1219                         dev->int_ep = ep;
1220                 }
1221         }
1222
1223         return 0;
1224 }
1225
1226 /* ------------------------------------------------------------------------
1227  * UVC device scan
1228  */
1229
1230 /*
1231  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1232  * and containing the following units:
1233  *
1234  * - one or more Output Terminals (USB Streaming or Display)
1235  * - zero or one Processing Unit
1236  * - zero, one or more single-input Selector Units
1237  * - zero or one multiple-input Selector Units, provided all inputs are
1238  *   connected to input terminals
1239  * - zero, one or mode single-input Extension Units
1240  * - one or more Input Terminals (Camera, External or USB Streaming)
1241  *
1242  * The terminal and units must match on of the following structures:
1243  *
1244  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1245  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1246  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1247  *
1248  *                 +---------+    +---------+ -> OTT_*(0)
1249  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1250  *                 +---------+    +---------+ -> OTT_*(n)
1251  *
1252  * The Processing Unit and Extension Units can be in any order. Additional
1253  * Extension Units connected to the main chain as single-unit branches are
1254  * also supported. Single-input Selector Units are ignored.
1255  */
1256 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1257         struct uvc_entity *entity)
1258 {
1259         switch (UVC_ENTITY_TYPE(entity)) {
1260         case UVC_VC_EXTENSION_UNIT:
1261                 if (uvc_trace_param & UVC_TRACE_PROBE)
1262                         printk(" <- XU %d", entity->id);
1263
1264                 if (entity->bNrInPins != 1) {
1265                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1266                                 "than 1 input pin.\n", entity->id);
1267                         return -1;
1268                 }
1269
1270                 break;
1271
1272         case UVC_VC_PROCESSING_UNIT:
1273                 if (uvc_trace_param & UVC_TRACE_PROBE)
1274                         printk(" <- PU %d", entity->id);
1275
1276                 if (chain->processing != NULL) {
1277                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1278                                 "Processing Units in chain.\n");
1279                         return -1;
1280                 }
1281
1282                 chain->processing = entity;
1283                 break;
1284
1285         case UVC_VC_SELECTOR_UNIT:
1286                 if (uvc_trace_param & UVC_TRACE_PROBE)
1287                         printk(" <- SU %d", entity->id);
1288
1289                 /* Single-input selector units are ignored. */
1290                 if (entity->bNrInPins == 1)
1291                         break;
1292
1293                 if (chain->selector != NULL) {
1294                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1295                                 "Units in chain.\n");
1296                         return -1;
1297                 }
1298
1299                 chain->selector = entity;
1300                 break;
1301
1302         case UVC_ITT_VENDOR_SPECIFIC:
1303         case UVC_ITT_CAMERA:
1304         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1305                 if (uvc_trace_param & UVC_TRACE_PROBE)
1306                         printk(" <- IT %d\n", entity->id);
1307
1308                 break;
1309
1310         case UVC_OTT_VENDOR_SPECIFIC:
1311         case UVC_OTT_DISPLAY:
1312         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1313                 if (uvc_trace_param & UVC_TRACE_PROBE)
1314                         printk(" OT %d", entity->id);
1315
1316                 break;
1317
1318         case UVC_TT_STREAMING:
1319                 if (UVC_ENTITY_IS_ITERM(entity)) {
1320                         if (uvc_trace_param & UVC_TRACE_PROBE)
1321                                 printk(" <- IT %d\n", entity->id);
1322                 } else {
1323                         if (uvc_trace_param & UVC_TRACE_PROBE)
1324                                 printk(" OT %d", entity->id);
1325                 }
1326
1327                 break;
1328
1329         default:
1330                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1331                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1332                 return -1;
1333         }
1334
1335         list_add_tail(&entity->chain, &chain->entities);
1336         return 0;
1337 }
1338
1339 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1340         struct uvc_entity *entity, struct uvc_entity *prev)
1341 {
1342         struct uvc_entity *forward;
1343         int found;
1344
1345         /* Forward scan */
1346         forward = NULL;
1347         found = 0;
1348
1349         while (1) {
1350                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1351                         forward);
1352                 if (forward == NULL)
1353                         break;
1354                 if (forward == prev)
1355                         continue;
1356
1357                 switch (UVC_ENTITY_TYPE(forward)) {
1358                 case UVC_VC_EXTENSION_UNIT:
1359                         if (forward->bNrInPins != 1) {
1360                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1361                                           "has more than 1 input pin.\n",
1362                                           entity->id);
1363                                 return -EINVAL;
1364                         }
1365
1366                         list_add_tail(&forward->chain, &chain->entities);
1367                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1368                                 if (!found)
1369                                         printk(" (->");
1370
1371                                 printk(" XU %d", forward->id);
1372                                 found = 1;
1373                         }
1374                         break;
1375
1376                 case UVC_OTT_VENDOR_SPECIFIC:
1377                 case UVC_OTT_DISPLAY:
1378                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1379                 case UVC_TT_STREAMING:
1380                         if (UVC_ENTITY_IS_ITERM(forward)) {
1381                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1382                                         "terminal %u.\n", forward->id);
1383                                 return -EINVAL;
1384                         }
1385
1386                         list_add_tail(&forward->chain, &chain->entities);
1387                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1388                                 if (!found)
1389                                         printk(" (->");
1390
1391                                 printk(" OT %d", forward->id);
1392                                 found = 1;
1393                         }
1394                         break;
1395                 }
1396         }
1397         if (found)
1398                 printk(")");
1399
1400         return 0;
1401 }
1402
1403 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1404         struct uvc_entity **_entity)
1405 {
1406         struct uvc_entity *entity = *_entity;
1407         struct uvc_entity *term;
1408         int id = -EINVAL, i;
1409
1410         switch (UVC_ENTITY_TYPE(entity)) {
1411         case UVC_VC_EXTENSION_UNIT:
1412         case UVC_VC_PROCESSING_UNIT:
1413                 id = entity->baSourceID[0];
1414                 break;
1415
1416         case UVC_VC_SELECTOR_UNIT:
1417                 /* Single-input selector units are ignored. */
1418                 if (entity->bNrInPins == 1) {
1419                         id = entity->baSourceID[0];
1420                         break;
1421                 }
1422
1423                 if (uvc_trace_param & UVC_TRACE_PROBE)
1424                         printk(" <- IT");
1425
1426                 chain->selector = entity;
1427                 for (i = 0; i < entity->bNrInPins; ++i) {
1428                         id = entity->baSourceID[i];
1429                         term = uvc_entity_by_id(chain->dev, id);
1430                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1431                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1432                                         "input %d isn't connected to an "
1433                                         "input terminal\n", entity->id, i);
1434                                 return -1;
1435                         }
1436
1437                         if (uvc_trace_param & UVC_TRACE_PROBE)
1438                                 printk(" %d", term->id);
1439
1440                         list_add_tail(&term->chain, &chain->entities);
1441                         uvc_scan_chain_forward(chain, term, entity);
1442                 }
1443
1444                 if (uvc_trace_param & UVC_TRACE_PROBE)
1445                         printk("\n");
1446
1447                 id = 0;
1448                 break;
1449
1450         case UVC_ITT_VENDOR_SPECIFIC:
1451         case UVC_ITT_CAMERA:
1452         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1453         case UVC_OTT_VENDOR_SPECIFIC:
1454         case UVC_OTT_DISPLAY:
1455         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1456         case UVC_TT_STREAMING:
1457                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1458                 break;
1459         }
1460
1461         if (id <= 0) {
1462                 *_entity = NULL;
1463                 return id;
1464         }
1465
1466         entity = uvc_entity_by_id(chain->dev, id);
1467         if (entity == NULL) {
1468                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1469                         "unknown entity %d.\n", id);
1470                 return -EINVAL;
1471         }
1472
1473         *_entity = entity;
1474         return 0;
1475 }
1476
1477 static int uvc_scan_chain(struct uvc_video_chain *chain,
1478                           struct uvc_entity *term)
1479 {
1480         struct uvc_entity *entity, *prev;
1481
1482         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1483
1484         entity = term;
1485         prev = NULL;
1486
1487         while (entity != NULL) {
1488                 /* Entity must not be part of an existing chain */
1489                 if (entity->chain.next || entity->chain.prev) {
1490                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1491                                 "entity %d already in chain.\n", entity->id);
1492                         return -EINVAL;
1493                 }
1494
1495                 /* Process entity */
1496                 if (uvc_scan_chain_entity(chain, entity) < 0)
1497                         return -EINVAL;
1498
1499                 /* Forward scan */
1500                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1501                         return -EINVAL;
1502
1503                 /* Backward scan */
1504                 prev = entity;
1505                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1506                         return -EINVAL;
1507         }
1508
1509         return 0;
1510 }
1511
1512 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1513                 char *buffer)
1514 {
1515         struct uvc_entity *term;
1516         unsigned int nterms = 0;
1517         char *p = buffer;
1518
1519         list_for_each_entry(term, terms, chain) {
1520                 if (!UVC_ENTITY_IS_TERM(term) ||
1521                     UVC_TERM_DIRECTION(term) != dir)
1522                         continue;
1523
1524                 if (nterms)
1525                         p += sprintf(p, ",");
1526                 if (++nterms >= 4) {
1527                         p += sprintf(p, "...");
1528                         break;
1529                 }
1530                 p += sprintf(p, "%u", term->id);
1531         }
1532
1533         return p - buffer;
1534 }
1535
1536 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1537 {
1538         static char buffer[43];
1539         char *p = buffer;
1540
1541         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1542         p += sprintf(p, " -> ");
1543         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1544
1545         return buffer;
1546 }
1547
1548 /*
1549  * Scan the device for video chains and register video devices.
1550  *
1551  * Chains are scanned starting at their output terminals and walked backwards.
1552  */
1553 static int uvc_scan_device(struct uvc_device *dev)
1554 {
1555         struct uvc_video_chain *chain;
1556         struct uvc_entity *term;
1557
1558         list_for_each_entry(term, &dev->entities, list) {
1559                 if (!UVC_ENTITY_IS_OTERM(term))
1560                         continue;
1561
1562                 /* If the terminal is already included in a chain, skip it.
1563                  * This can happen for chains that have multiple output
1564                  * terminals, where all output terminals beside the first one
1565                  * will be inserted in the chain in forward scans.
1566                  */
1567                 if (term->chain.next || term->chain.prev)
1568                         continue;
1569
1570                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1571                 if (chain == NULL)
1572                         return -ENOMEM;
1573
1574                 INIT_LIST_HEAD(&chain->entities);
1575                 mutex_init(&chain->ctrl_mutex);
1576                 chain->dev = dev;
1577
1578                 if (uvc_scan_chain(chain, term) < 0) {
1579                         kfree(chain);
1580                         continue;
1581                 }
1582
1583                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1584                           uvc_print_chain(chain));
1585
1586                 list_add_tail(&chain->list, &dev->chains);
1587         }
1588
1589         if (list_empty(&dev->chains)) {
1590                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1591                 return -1;
1592         }
1593
1594         return 0;
1595 }
1596
1597 /* ------------------------------------------------------------------------
1598  * Video device registration and unregistration
1599  */
1600
1601 /*
1602  * Delete the UVC device.
1603  *
1604  * Called by the kernel when the last reference to the uvc_device structure
1605  * is released.
1606  *
1607  * As this function is called after or during disconnect(), all URBs have
1608  * already been canceled by the USB core. There is no need to kill the
1609  * interrupt URB manually.
1610  */
1611 static void uvc_delete(struct uvc_device *dev)
1612 {
1613         struct list_head *p, *n;
1614
1615         usb_put_intf(dev->intf);
1616         usb_put_dev(dev->udev);
1617
1618         uvc_status_cleanup(dev);
1619         uvc_ctrl_cleanup_device(dev);
1620
1621         if (dev->vdev.dev)
1622                 v4l2_device_unregister(&dev->vdev);
1623 #ifdef CONFIG_MEDIA_CONTROLLER
1624         if (media_devnode_is_registered(&dev->mdev.devnode))
1625                 media_device_unregister(&dev->mdev);
1626 #endif
1627
1628         list_for_each_safe(p, n, &dev->chains) {
1629                 struct uvc_video_chain *chain;
1630                 chain = list_entry(p, struct uvc_video_chain, list);
1631                 kfree(chain);
1632         }
1633
1634         list_for_each_safe(p, n, &dev->entities) {
1635                 struct uvc_entity *entity;
1636                 entity = list_entry(p, struct uvc_entity, list);
1637 #ifdef CONFIG_MEDIA_CONTROLLER
1638                 uvc_mc_cleanup_entity(entity);
1639 #endif
1640                 if (entity->vdev) {
1641                         video_device_release(entity->vdev);
1642                         entity->vdev = NULL;
1643                 }
1644                 kfree(entity);
1645         }
1646
1647         list_for_each_safe(p, n, &dev->streams) {
1648                 struct uvc_streaming *streaming;
1649                 streaming = list_entry(p, struct uvc_streaming, list);
1650                 usb_driver_release_interface(&uvc_driver.driver,
1651                         streaming->intf);
1652                 usb_put_intf(streaming->intf);
1653                 kfree(streaming->format);
1654                 kfree(streaming->header.bmaControls);
1655                 kfree(streaming);
1656         }
1657
1658         kfree(dev);
1659 }
1660
1661 static void uvc_release(struct video_device *vdev)
1662 {
1663         struct uvc_streaming *stream = video_get_drvdata(vdev);
1664         struct uvc_device *dev = stream->dev;
1665
1666         /* Decrement the registered streams count and delete the device when it
1667          * reaches zero.
1668          */
1669         if (atomic_dec_and_test(&dev->nstreams))
1670                 uvc_delete(dev);
1671 }
1672
1673 /*
1674  * Unregister the video devices.
1675  */
1676 static void uvc_unregister_video(struct uvc_device *dev)
1677 {
1678         struct uvc_streaming *stream;
1679
1680         /* Unregistering all video devices might result in uvc_delete() being
1681          * called from inside the loop if there's no open file handle. To avoid
1682          * that, increment the stream count before iterating over the streams
1683          * and decrement it when done.
1684          */
1685         atomic_inc(&dev->nstreams);
1686
1687         list_for_each_entry(stream, &dev->streams, list) {
1688                 if (stream->vdev == NULL)
1689                         continue;
1690
1691                 video_unregister_device(stream->vdev);
1692                 stream->vdev = NULL;
1693
1694                 uvc_debugfs_cleanup_stream(stream);
1695         }
1696
1697         /* Decrement the stream count and call uvc_delete explicitly if there
1698          * are no stream left.
1699          */
1700         if (atomic_dec_and_test(&dev->nstreams))
1701                 uvc_delete(dev);
1702 }
1703
1704 static int uvc_register_video(struct uvc_device *dev,
1705                 struct uvc_streaming *stream)
1706 {
1707         struct video_device *vdev;
1708         int ret;
1709
1710         /* Initialize the streaming interface with default streaming
1711          * parameters.
1712          */
1713         ret = uvc_video_init(stream);
1714         if (ret < 0) {
1715                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1716                         "(%d).\n", ret);
1717                 return ret;
1718         }
1719
1720         uvc_debugfs_init_stream(stream);
1721
1722         /* Register the device with V4L. */
1723         vdev = video_device_alloc();
1724         if (vdev == NULL) {
1725                 uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
1726                            ret);
1727                 return -ENOMEM;
1728         }
1729
1730         /* We already hold a reference to dev->udev. The video device will be
1731          * unregistered before the reference is released, so we don't need to
1732          * get another one.
1733          */
1734         vdev->v4l2_dev = &dev->vdev;
1735         vdev->fops = &uvc_fops;
1736         vdev->release = uvc_release;
1737         strlcpy(vdev->name, dev->name, sizeof vdev->name);
1738
1739         /* Set the driver data before calling video_register_device, otherwise
1740          * uvc_v4l2_open might race us.
1741          */
1742         stream->vdev = vdev;
1743         video_set_drvdata(vdev, stream);
1744
1745         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1746         if (ret < 0) {
1747                 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1748                            ret);
1749                 stream->vdev = NULL;
1750                 video_device_release(vdev);
1751                 return ret;
1752         }
1753
1754         atomic_inc(&dev->nstreams);
1755         return 0;
1756 }
1757
1758 /*
1759  * Register all video devices in all chains.
1760  */
1761 static int uvc_register_terms(struct uvc_device *dev,
1762         struct uvc_video_chain *chain)
1763 {
1764         struct uvc_streaming *stream;
1765         struct uvc_entity *term;
1766         int ret;
1767
1768         list_for_each_entry(term, &chain->entities, chain) {
1769                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1770                         continue;
1771
1772                 stream = uvc_stream_by_id(dev, term->id);
1773                 if (stream == NULL) {
1774                         uvc_printk(KERN_INFO, "No streaming interface found "
1775                                    "for terminal %u.", term->id);
1776                         continue;
1777                 }
1778
1779                 stream->chain = chain;
1780                 ret = uvc_register_video(dev, stream);
1781                 if (ret < 0)
1782                         return ret;
1783
1784                 term->vdev = stream->vdev;
1785         }
1786
1787         return 0;
1788 }
1789
1790 static int uvc_register_chains(struct uvc_device *dev)
1791 {
1792         struct uvc_video_chain *chain;
1793         int ret;
1794
1795         list_for_each_entry(chain, &dev->chains, list) {
1796                 ret = uvc_register_terms(dev, chain);
1797                 if (ret < 0)
1798                         return ret;
1799
1800 #ifdef CONFIG_MEDIA_CONTROLLER
1801                 ret = uvc_mc_register_entities(chain);
1802                 if (ret < 0) {
1803                         uvc_printk(KERN_INFO, "Failed to register entites "
1804                                 "(%d).\n", ret);
1805                 }
1806 #endif
1807         }
1808
1809         return 0;
1810 }
1811
1812 /* ------------------------------------------------------------------------
1813  * USB probe, disconnect, suspend and resume
1814  */
1815
1816 static int uvc_probe(struct usb_interface *intf,
1817                      const struct usb_device_id *id)
1818 {
1819         struct usb_device *udev = interface_to_usbdev(intf);
1820         struct uvc_device *dev;
1821         int ret;
1822
1823         if (id->idVendor && id->idProduct)
1824                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1825                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1826                                 id->idProduct);
1827         else
1828                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1829                                 udev->devpath);
1830
1831         /* Allocate memory for the device and initialize it. */
1832         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1833                 return -ENOMEM;
1834
1835         INIT_LIST_HEAD(&dev->entities);
1836         INIT_LIST_HEAD(&dev->chains);
1837         INIT_LIST_HEAD(&dev->streams);
1838         atomic_set(&dev->nstreams, 0);
1839         atomic_set(&dev->users, 0);
1840         atomic_set(&dev->nmappings, 0);
1841
1842         dev->udev = usb_get_dev(udev);
1843         dev->intf = usb_get_intf(intf);
1844         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1845         dev->quirks = (uvc_quirks_param == -1)
1846                     ? id->driver_info : uvc_quirks_param;
1847
1848         if (udev->product != NULL)
1849                 strlcpy(dev->name, udev->product, sizeof dev->name);
1850         else
1851                 snprintf(dev->name, sizeof dev->name,
1852                         "UVC Camera (%04x:%04x)",
1853                         le16_to_cpu(udev->descriptor.idVendor),
1854                         le16_to_cpu(udev->descriptor.idProduct));
1855
1856         /* Parse the Video Class control descriptor. */
1857         if (uvc_parse_control(dev) < 0) {
1858                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1859                         "descriptors.\n");
1860                 goto error;
1861         }
1862
1863         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
1864                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1865                 udev->product ? udev->product : "<unnamed>",
1866                 le16_to_cpu(udev->descriptor.idVendor),
1867                 le16_to_cpu(udev->descriptor.idProduct));
1868
1869         if (dev->quirks != id->driver_info) {
1870                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
1871                         "parameter for testing purpose.\n", dev->quirks);
1872                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1873                         "linux-uvc-devel mailing list.\n");
1874         }
1875
1876         /* Register the media and V4L2 devices. */
1877 #ifdef CONFIG_MEDIA_CONTROLLER
1878         dev->mdev.dev = &intf->dev;
1879         strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
1880         if (udev->serial)
1881                 strlcpy(dev->mdev.serial, udev->serial,
1882                         sizeof(dev->mdev.serial));
1883         strcpy(dev->mdev.bus_info, udev->devpath);
1884         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
1885         dev->mdev.driver_version = LINUX_VERSION_CODE;
1886         if (media_device_register(&dev->mdev) < 0)
1887                 goto error;
1888
1889         dev->vdev.mdev = &dev->mdev;
1890 #endif
1891         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
1892                 goto error;
1893
1894         /* Initialize controls. */
1895         if (uvc_ctrl_init_device(dev) < 0)
1896                 goto error;
1897
1898         /* Scan the device for video chains. */
1899         if (uvc_scan_device(dev) < 0)
1900                 goto error;
1901
1902         /* Register video device nodes. */
1903         if (uvc_register_chains(dev) < 0)
1904                 goto error;
1905
1906         /* Save our data pointer in the interface data. */
1907         usb_set_intfdata(intf, dev);
1908
1909         /* Initialize the interrupt URB. */
1910         if ((ret = uvc_status_init(dev)) < 0) {
1911                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1912                         "endpoint (%d), status interrupt will not be "
1913                         "supported.\n", ret);
1914         }
1915
1916         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1917         usb_enable_autosuspend(udev);
1918         return 0;
1919
1920 error:
1921         uvc_unregister_video(dev);
1922         return -ENODEV;
1923 }
1924
1925 static void uvc_disconnect(struct usb_interface *intf)
1926 {
1927         struct uvc_device *dev = usb_get_intfdata(intf);
1928
1929         /* Set the USB interface data to NULL. This can be done outside the
1930          * lock, as there's no other reader.
1931          */
1932         usb_set_intfdata(intf, NULL);
1933
1934         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1935             UVC_SC_VIDEOSTREAMING)
1936                 return;
1937
1938         dev->state |= UVC_DEV_DISCONNECTED;
1939
1940         uvc_unregister_video(dev);
1941 }
1942
1943 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1944 {
1945         struct uvc_device *dev = usb_get_intfdata(intf);
1946         struct uvc_streaming *stream;
1947
1948         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1949                 intf->cur_altsetting->desc.bInterfaceNumber);
1950
1951         /* Controls are cached on the fly so they don't need to be saved. */
1952         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1953             UVC_SC_VIDEOCONTROL)
1954                 return uvc_status_suspend(dev);
1955
1956         list_for_each_entry(stream, &dev->streams, list) {
1957                 if (stream->intf == intf)
1958                         return uvc_video_suspend(stream);
1959         }
1960
1961         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
1962                         "mismatch.\n");
1963         return -EINVAL;
1964 }
1965
1966 static int __uvc_resume(struct usb_interface *intf, int reset)
1967 {
1968         struct uvc_device *dev = usb_get_intfdata(intf);
1969         struct uvc_streaming *stream;
1970
1971         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1972                 intf->cur_altsetting->desc.bInterfaceNumber);
1973
1974         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1975             UVC_SC_VIDEOCONTROL) {
1976                 if (reset) {
1977                         int ret = uvc_ctrl_resume_device(dev);
1978
1979                         if (ret < 0)
1980                                 return ret;
1981                 }
1982
1983                 return uvc_status_resume(dev);
1984         }
1985
1986         list_for_each_entry(stream, &dev->streams, list) {
1987                 if (stream->intf == intf)
1988                         return uvc_video_resume(stream, reset);
1989         }
1990
1991         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
1992                         "mismatch.\n");
1993         return -EINVAL;
1994 }
1995
1996 static int uvc_resume(struct usb_interface *intf)
1997 {
1998         return __uvc_resume(intf, 0);
1999 }
2000
2001 static int uvc_reset_resume(struct usb_interface *intf)
2002 {
2003         return __uvc_resume(intf, 1);
2004 }
2005
2006 /* ------------------------------------------------------------------------
2007  * Module parameters
2008  */
2009
2010 static int uvc_clock_param_get(char *buffer, struct kernel_param *kp)
2011 {
2012         if (uvc_clock_param == CLOCK_MONOTONIC)
2013                 return sprintf(buffer, "CLOCK_MONOTONIC");
2014         else
2015                 return sprintf(buffer, "CLOCK_REALTIME");
2016 }
2017
2018 static int uvc_clock_param_set(const char *val, struct kernel_param *kp)
2019 {
2020         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2021                 val += strlen("clock_");
2022
2023         if (strcasecmp(val, "monotonic") == 0)
2024                 uvc_clock_param = CLOCK_MONOTONIC;
2025         else if (strcasecmp(val, "realtime") == 0)
2026                 uvc_clock_param = CLOCK_REALTIME;
2027         else
2028                 return -EINVAL;
2029
2030         return 0;
2031 }
2032
2033 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2034                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2035 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2036 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2037 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2038 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2039 MODULE_PARM_DESC(quirks, "Forced device quirks");
2040 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2041 MODULE_PARM_DESC(trace, "Trace level bitmask");
2042 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2043 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2044
2045 /* ------------------------------------------------------------------------
2046  * Driver initialization and cleanup
2047  */
2048
2049 /*
2050  * The Logitech cameras listed below have their interface class set to
2051  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2052  * though they are compliant.
2053  */
2054 static struct usb_device_id uvc_ids[] = {
2055         /* LogiLink Wireless Webcam */
2056         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2057                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2058           .idVendor             = 0x0416,
2059           .idProduct            = 0xa91a,
2060           .bInterfaceClass      = USB_CLASS_VIDEO,
2061           .bInterfaceSubClass   = 1,
2062           .bInterfaceProtocol   = 0,
2063           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2064         /* Genius eFace 2025 */
2065         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2066                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2067           .idVendor             = 0x0458,
2068           .idProduct            = 0x706e,
2069           .bInterfaceClass      = USB_CLASS_VIDEO,
2070           .bInterfaceSubClass   = 1,
2071           .bInterfaceProtocol   = 0,
2072           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2073         /* Microsoft Lifecam NX-6000 */
2074         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2075                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2076           .idVendor             = 0x045e,
2077           .idProduct            = 0x00f8,
2078           .bInterfaceClass      = USB_CLASS_VIDEO,
2079           .bInterfaceSubClass   = 1,
2080           .bInterfaceProtocol   = 0,
2081           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2082         /* Microsoft Lifecam VX-7000 */
2083         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2084                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2085           .idVendor             = 0x045e,
2086           .idProduct            = 0x0723,
2087           .bInterfaceClass      = USB_CLASS_VIDEO,
2088           .bInterfaceSubClass   = 1,
2089           .bInterfaceProtocol   = 0,
2090           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2091         /* Logitech Quickcam Fusion */
2092         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2093                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2094           .idVendor             = 0x046d,
2095           .idProduct            = 0x08c1,
2096           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2097           .bInterfaceSubClass   = 1,
2098           .bInterfaceProtocol   = 0 },
2099         /* Logitech Quickcam Orbit MP */
2100         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2101                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2102           .idVendor             = 0x046d,
2103           .idProduct            = 0x08c2,
2104           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2105           .bInterfaceSubClass   = 1,
2106           .bInterfaceProtocol   = 0 },
2107         /* Logitech Quickcam Pro for Notebook */
2108         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2109                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2110           .idVendor             = 0x046d,
2111           .idProduct            = 0x08c3,
2112           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2113           .bInterfaceSubClass   = 1,
2114           .bInterfaceProtocol   = 0 },
2115         /* Logitech Quickcam Pro 5000 */
2116         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2117                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2118           .idVendor             = 0x046d,
2119           .idProduct            = 0x08c5,
2120           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2121           .bInterfaceSubClass   = 1,
2122           .bInterfaceProtocol   = 0 },
2123         /* Logitech Quickcam OEM Dell Notebook */
2124         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2125                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2126           .idVendor             = 0x046d,
2127           .idProduct            = 0x08c6,
2128           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2129           .bInterfaceSubClass   = 1,
2130           .bInterfaceProtocol   = 0 },
2131         /* Logitech Quickcam OEM Cisco VT Camera II */
2132         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2133                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2134           .idVendor             = 0x046d,
2135           .idProduct            = 0x08c7,
2136           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2137           .bInterfaceSubClass   = 1,
2138           .bInterfaceProtocol   = 0 },
2139         /* Chicony CNF7129 (Asus EEE 100HE) */
2140         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2141                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2142           .idVendor             = 0x04f2,
2143           .idProduct            = 0xb071,
2144           .bInterfaceClass      = USB_CLASS_VIDEO,
2145           .bInterfaceSubClass   = 1,
2146           .bInterfaceProtocol   = 0,
2147           .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
2148         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2149         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2150                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2151           .idVendor             = 0x058f,
2152           .idProduct            = 0x3820,
2153           .bInterfaceClass      = USB_CLASS_VIDEO,
2154           .bInterfaceSubClass   = 1,
2155           .bInterfaceProtocol   = 0,
2156           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2157         /* Dell XPS m1530 */
2158         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2159                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2160           .idVendor             = 0x05a9,
2161           .idProduct            = 0x2640,
2162           .bInterfaceClass      = USB_CLASS_VIDEO,
2163           .bInterfaceSubClass   = 1,
2164           .bInterfaceProtocol   = 0,
2165           .driver_info          = UVC_QUIRK_PROBE_DEF },
2166         /* Apple Built-In iSight */
2167         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2168                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2169           .idVendor             = 0x05ac,
2170           .idProduct            = 0x8501,
2171           .bInterfaceClass      = USB_CLASS_VIDEO,
2172           .bInterfaceSubClass   = 1,
2173           .bInterfaceProtocol   = 0,
2174           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2175                                 | UVC_QUIRK_BUILTIN_ISIGHT },
2176         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2177         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2178                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2179           .idVendor             = 0x05c8,
2180           .idProduct            = 0x0403,
2181           .bInterfaceClass      = USB_CLASS_VIDEO,
2182           .bInterfaceSubClass   = 1,
2183           .bInterfaceProtocol   = 0,
2184           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2185         /* Genesys Logic USB 2.0 PC Camera */
2186         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2187                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2188           .idVendor             = 0x05e3,
2189           .idProduct            = 0x0505,
2190           .bInterfaceClass      = USB_CLASS_VIDEO,
2191           .bInterfaceSubClass   = 1,
2192           .bInterfaceProtocol   = 0,
2193           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2194         /* Hercules Classic Silver */
2195         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2196                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2197           .idVendor             = 0x06f8,
2198           .idProduct            = 0x300c,
2199           .bInterfaceClass      = USB_CLASS_VIDEO,
2200           .bInterfaceSubClass   = 1,
2201           .bInterfaceProtocol   = 0,
2202           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2203         /* ViMicro Vega */
2204         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2205                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2206           .idVendor             = 0x0ac8,
2207           .idProduct            = 0x332d,
2208           .bInterfaceClass      = USB_CLASS_VIDEO,
2209           .bInterfaceSubClass   = 1,
2210           .bInterfaceProtocol   = 0,
2211           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2212         /* ViMicro - Minoru3D */
2213         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2214                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2215           .idVendor             = 0x0ac8,
2216           .idProduct            = 0x3410,
2217           .bInterfaceClass      = USB_CLASS_VIDEO,
2218           .bInterfaceSubClass   = 1,
2219           .bInterfaceProtocol   = 0,
2220           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2221         /* ViMicro Venus - Minoru3D */
2222         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2223                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2224           .idVendor             = 0x0ac8,
2225           .idProduct            = 0x3420,
2226           .bInterfaceClass      = USB_CLASS_VIDEO,
2227           .bInterfaceSubClass   = 1,
2228           .bInterfaceProtocol   = 0,
2229           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2230         /* Ophir Optronics - SPCAM 620U */
2231         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2232                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2233           .idVendor             = 0x0bd3,
2234           .idProduct            = 0x0555,
2235           .bInterfaceClass      = USB_CLASS_VIDEO,
2236           .bInterfaceSubClass   = 1,
2237           .bInterfaceProtocol   = 0,
2238           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2239         /* MT6227 */
2240         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2241                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2242           .idVendor             = 0x0e8d,
2243           .idProduct            = 0x0004,
2244           .bInterfaceClass      = USB_CLASS_VIDEO,
2245           .bInterfaceSubClass   = 1,
2246           .bInterfaceProtocol   = 0,
2247           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2248                                 | UVC_QUIRK_PROBE_DEF },
2249         /* IMC Networks (Medion Akoya) */
2250         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2251                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2252           .idVendor             = 0x13d3,
2253           .idProduct            = 0x5103,
2254           .bInterfaceClass      = USB_CLASS_VIDEO,
2255           .bInterfaceSubClass   = 1,
2256           .bInterfaceProtocol   = 0,
2257           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2258         /* JMicron USB2.0 XGA WebCam */
2259         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2260                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2261           .idVendor             = 0x152d,
2262           .idProduct            = 0x0310,
2263           .bInterfaceClass      = USB_CLASS_VIDEO,
2264           .bInterfaceSubClass   = 1,
2265           .bInterfaceProtocol   = 0,
2266           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2267         /* Syntek (HP Spartan) */
2268         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2269                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2270           .idVendor             = 0x174f,
2271           .idProduct            = 0x5212,
2272           .bInterfaceClass      = USB_CLASS_VIDEO,
2273           .bInterfaceSubClass   = 1,
2274           .bInterfaceProtocol   = 0,
2275           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2276         /* Syntek (Samsung Q310) */
2277         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2278                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2279           .idVendor             = 0x174f,
2280           .idProduct            = 0x5931,
2281           .bInterfaceClass      = USB_CLASS_VIDEO,
2282           .bInterfaceSubClass   = 1,
2283           .bInterfaceProtocol   = 0,
2284           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2285         /* Syntek (Packard Bell EasyNote MX52 */
2286         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2287                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2288           .idVendor             = 0x174f,
2289           .idProduct            = 0x8a12,
2290           .bInterfaceClass      = USB_CLASS_VIDEO,
2291           .bInterfaceSubClass   = 1,
2292           .bInterfaceProtocol   = 0,
2293           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2294         /* Syntek (Asus F9SG) */
2295         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2296                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2297           .idVendor             = 0x174f,
2298           .idProduct            = 0x8a31,
2299           .bInterfaceClass      = USB_CLASS_VIDEO,
2300           .bInterfaceSubClass   = 1,
2301           .bInterfaceProtocol   = 0,
2302           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2303         /* Syntek (Asus U3S) */
2304         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2305                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2306           .idVendor             = 0x174f,
2307           .idProduct            = 0x8a33,
2308           .bInterfaceClass      = USB_CLASS_VIDEO,
2309           .bInterfaceSubClass   = 1,
2310           .bInterfaceProtocol   = 0,
2311           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2312         /* Syntek (JAOtech Smart Terminal) */
2313         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2314                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2315           .idVendor             = 0x174f,
2316           .idProduct            = 0x8a34,
2317           .bInterfaceClass      = USB_CLASS_VIDEO,
2318           .bInterfaceSubClass   = 1,
2319           .bInterfaceProtocol   = 0,
2320           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2321         /* Miricle 307K */
2322         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2323                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2324           .idVendor             = 0x17dc,
2325           .idProduct            = 0x0202,
2326           .bInterfaceClass      = USB_CLASS_VIDEO,
2327           .bInterfaceSubClass   = 1,
2328           .bInterfaceProtocol   = 0,
2329           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2330         /* Lenovo Thinkpad SL400/SL500 */
2331         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2332                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2333           .idVendor             = 0x17ef,
2334           .idProduct            = 0x480b,
2335           .bInterfaceClass      = USB_CLASS_VIDEO,
2336           .bInterfaceSubClass   = 1,
2337           .bInterfaceProtocol   = 0,
2338           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2339         /* Aveo Technology USB 2.0 Camera */
2340         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2341                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2342           .idVendor             = 0x1871,
2343           .idProduct            = 0x0306,
2344           .bInterfaceClass      = USB_CLASS_VIDEO,
2345           .bInterfaceSubClass   = 1,
2346           .bInterfaceProtocol   = 0,
2347           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2348                                 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2349         /* Ecamm Pico iMage */
2350         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2351                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2352           .idVendor             = 0x18cd,
2353           .idProduct            = 0xcafe,
2354           .bInterfaceClass      = USB_CLASS_VIDEO,
2355           .bInterfaceSubClass   = 1,
2356           .bInterfaceProtocol   = 0,
2357           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
2358         /* Manta MM-353 Plako */
2359         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2360                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2361           .idVendor             = 0x18ec,
2362           .idProduct            = 0x3188,
2363           .bInterfaceClass      = USB_CLASS_VIDEO,
2364           .bInterfaceSubClass   = 1,
2365           .bInterfaceProtocol   = 0,
2366           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2367         /* FSC WebCam V30S */
2368         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2369                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2370           .idVendor             = 0x18ec,
2371           .idProduct            = 0x3288,
2372           .bInterfaceClass      = USB_CLASS_VIDEO,
2373           .bInterfaceSubClass   = 1,
2374           .bInterfaceProtocol   = 0,
2375           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2376         /* Arkmicro unbranded */
2377         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2378                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2379           .idVendor             = 0x18ec,
2380           .idProduct            = 0x3290,
2381           .bInterfaceClass      = USB_CLASS_VIDEO,
2382           .bInterfaceSubClass   = 1,
2383           .bInterfaceProtocol   = 0,
2384           .driver_info          = UVC_QUIRK_PROBE_DEF },
2385         /* The Imaging Source USB CCD cameras */
2386         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2387                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2388           .idVendor             = 0x199e,
2389           .idProduct            = 0x8102,
2390           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2391           .bInterfaceSubClass   = 1,
2392           .bInterfaceProtocol   = 0 },
2393         /* Bodelin ProScopeHR */
2394         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2395                                 | USB_DEVICE_ID_MATCH_DEV_HI
2396                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2397           .idVendor             = 0x19ab,
2398           .idProduct            = 0x1000,
2399           .bcdDevice_hi         = 0x0126,
2400           .bInterfaceClass      = USB_CLASS_VIDEO,
2401           .bInterfaceSubClass   = 1,
2402           .bInterfaceProtocol   = 0,
2403           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
2404         /* MSI StarCam 370i */
2405         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2406                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2407           .idVendor             = 0x1b3b,
2408           .idProduct            = 0x2951,
2409           .bInterfaceClass      = USB_CLASS_VIDEO,
2410           .bInterfaceSubClass   = 1,
2411           .bInterfaceProtocol   = 0,
2412           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2413         /* SiGma Micro USB Web Camera */
2414         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2415                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2416           .idVendor             = 0x1c4f,
2417           .idProduct            = 0x3000,
2418           .bInterfaceClass      = USB_CLASS_VIDEO,
2419           .bInterfaceSubClass   = 1,
2420           .bInterfaceProtocol   = 0,
2421           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2422                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2423         /* Generic USB Video Class */
2424         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
2425         {}
2426 };
2427
2428 MODULE_DEVICE_TABLE(usb, uvc_ids);
2429
2430 struct uvc_driver uvc_driver = {
2431         .driver = {
2432                 .name           = "uvcvideo",
2433                 .probe          = uvc_probe,
2434                 .disconnect     = uvc_disconnect,
2435                 .suspend        = uvc_suspend,
2436                 .resume         = uvc_resume,
2437                 .reset_resume   = uvc_reset_resume,
2438                 .id_table       = uvc_ids,
2439                 .supports_autosuspend = 1,
2440         },
2441 };
2442
2443 static int __init uvc_init(void)
2444 {
2445         int ret;
2446
2447         uvc_debugfs_init();
2448
2449         ret = usb_register(&uvc_driver.driver);
2450         if (ret < 0) {
2451                 uvc_debugfs_cleanup();
2452                 return ret;
2453         }
2454
2455         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2456         return 0;
2457 }
2458
2459 static void __exit uvc_cleanup(void)
2460 {
2461         usb_deregister(&uvc_driver.driver);
2462         uvc_debugfs_cleanup();
2463 }
2464
2465 module_init(uvc_init);
2466 module_exit(uvc_cleanup);
2467
2468 MODULE_AUTHOR(DRIVER_AUTHOR);
2469 MODULE_DESCRIPTION(DRIVER_DESC);
2470 MODULE_LICENSE("GPL");
2471 MODULE_VERSION(DRIVER_VERSION);
2472