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   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2008
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 /*
  15  * This driver aims to support video input devices compliant with the 'USB
  16  * Video Class' specification.
  17  *
  18  * The driver doesn't support the deprecated v4l1 interface. It implements the
  19  * mmap capture method only, and doesn't do any image format conversion in
  20  * software. If your user-space application doesn't support YUYV or MJPEG, fix
  21  * it :-). Please note that the MJPEG data have been stripped from their
  22  * Huffman tables (DHT marker), you will need to add it back if your JPEG
  23  * codec can't handle MJPEG data.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/version.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/usb.h>
  31 #include <linux/videodev2.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/wait.h>
  34 #include <asm/atomic.h>
  35
  36 #include <media/v4l2-common.h>
  37
  38 #include "uvcvideo.h"
  39
  40 #define DRIVER_AUTHOR           "Laurent Pinchart <laurent.pinchart@skynet.be>"
  41 #define DRIVER_DESC             "USB Video Class driver"
  42 #ifndef DRIVER_VERSION
  43 #define DRIVER_VERSION          "v0.1.0"
  44 #endif
  45
  46 static unsigned int uvc_quirks_param;
  47 unsigned int uvc_trace_param;
  48
  49 /* ------------------------------------------------------------------------
  50  * Control, formats, ...
  51  */
  52
  53 static struct uvc_format_desc uvc_fmts[] = {
  54         {
  55                 .name           = "YUV 4:2:2 (YUYV)",
  56                 .guid           = UVC_GUID_FORMAT_YUY2,
  57                 .fcc            = V4L2_PIX_FMT_YUYV,
  58         },
  59         {
  60                 .name           = "YUV 4:2:0 (NV12)",
  61                 .guid           = UVC_GUID_FORMAT_NV12,
  62                 .fcc            = V4L2_PIX_FMT_NV12,
  63         },
  64         {
  65                 .name           = "MJPEG",
  66                 .guid           = UVC_GUID_FORMAT_MJPEG,
  67                 .fcc            = V4L2_PIX_FMT_MJPEG,
  68         },
  69         {
  70                 .name           = "YVU 4:2:0 (YV12)",
  71                 .guid           = UVC_GUID_FORMAT_YV12,
  72                 .fcc            = V4L2_PIX_FMT_YVU420,
  73         },
  74         {
  75                 .name           = "YUV 4:2:0 (I420)",
  76                 .guid           = UVC_GUID_FORMAT_I420,
  77                 .fcc            = V4L2_PIX_FMT_YUV420,
  78         },
  79         {
  80                 .name           = "YUV 4:2:2 (UYVY)",
  81                 .guid           = UVC_GUID_FORMAT_UYVY,
  82                 .fcc            = V4L2_PIX_FMT_UYVY,
  83         },
  84         {
  85                 .name           = "Greyscale",
  86                 .guid           = UVC_GUID_FORMAT_Y800,
  87                 .fcc            = V4L2_PIX_FMT_GREY,
  88         },
  89         {
  90                 .name           = "RGB Bayer",
  91                 .guid           = UVC_GUID_FORMAT_BY8,
  92                 .fcc            = V4L2_PIX_FMT_SBGGR8,
  93         },
  94 };
  95
  96 /* ------------------------------------------------------------------------
  97  * Utility functions
  98  */
  99
 100 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 101                 __u8 epaddr)
 102 {
 103         struct usb_host_endpoint *ep;
 104         unsigned int i;
 105
 106         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 107                 ep = &alts->endpoint[i];
 108                 if (ep->desc.bEndpointAddress == epaddr)
 109                         return ep;
 110         }
 111
 112         return NULL;
 113 }
 114
 115 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 116 {
 117         unsigned int len = ARRAY_SIZE(uvc_fmts);
 118         unsigned int i;
 119
 120         for (i = 0; i < len; ++i) {
 121                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 122                         return &uvc_fmts[i];
 123         }
 124
 125         return NULL;
 126 }
 127
 128 static __u32 uvc_colorspace(const __u8 primaries)
 129 {
 130         static const __u8 colorprimaries[] = {
 131                 0,
 132                 V4L2_COLORSPACE_SRGB,
 133                 V4L2_COLORSPACE_470_SYSTEM_M,
 134                 V4L2_COLORSPACE_470_SYSTEM_BG,
 135                 V4L2_COLORSPACE_SMPTE170M,
 136                 V4L2_COLORSPACE_SMPTE240M,
 137         };
 138
 139         if (primaries < ARRAY_SIZE(colorprimaries))
 140                 return colorprimaries[primaries];
 141
 142         return 0;
 143 }
 144
 145 /* Simplify a fraction using a simple continued fraction decomposition. The
 146  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 147  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 148  * arbitrary parameters to remove non-significative terms from the simple
 149  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 150  * respectively seems to give nice results.
 151  */
 152 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 153                 unsigned int n_terms, unsigned int threshold)
 154 {
 155         uint32_t *an;
 156         uint32_t x, y, r;
 157         unsigned int i, n;
 158
 159         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 160         if (an == NULL)
 161                 return;
 162
 163         /* Convert the fraction to a simple continued fraction. See
 164          * http://mathforum.org/dr.math/faq/faq.fractions.html
 165          * Stop if the current term is bigger than or equal to the given
 166          * threshold.
 167          */
 168         x = *numerator;
 169         y = *denominator;
 170
 171         for (n = 0; n < n_terms && y != 0; ++n) {
 172                 an[n] = x / y;
 173                 if (an[n] >= threshold) {
 174                         if (n < 2)
 175                                 n++;
 176                         break;
 177                 }
 178
 179                 r = x - an[n] * y;
 180                 x = y;
 181                 y = r;
 182         }
 183
 184         /* Expand the simple continued fraction back to an integer fraction. */
 185         x = 0;
 186         y = 1;
 187
 188         for (i = n; i > 0; --i) {
 189                 r = y;
 190                 y = an[i-1] * y + x;
 191                 x = r;
 192         }
 193
 194         *numerator = y;
 195         *denominator = x;
 196         kfree(an);
 197 }
 198
 199 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 200  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 201  * arithmetic only.
 202  */
 203 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 204 {
 205         uint32_t multiplier;
 206
 207         /* Saturate the result if the operation would overflow. */
 208         if (denominator == 0 ||
 209             numerator/denominator >= ((uint32_t)-1)/10000000)
 210                 return (uint32_t)-1;
 211
 212         /* Divide both the denominator and the multiplier by two until
 213          * numerator * multiplier doesn't overflow. If anyone knows a better
 214          * algorithm please let me know.
 215          */
 216         multiplier = 10000000;
 217         while (numerator > ((uint32_t)-1)/multiplier) {
 218                 multiplier /= 2;
 219                 denominator /= 2;
 220         }
 221
 222         return denominator ? numerator * multiplier / denominator : 0;
 223 }
 224
 225 /* ------------------------------------------------------------------------
 226  * Terminal and unit management
 227  */
 228
 229 static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 230 {
 231         struct uvc_entity *entity;
 232
 233         list_for_each_entry(entity, &dev->entities, list) {
 234                 if (entity->id == id)
 235                         return entity;
 236         }
 237
 238         return NULL;
 239 }
 240
 241 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 242         int id, struct uvc_entity *entity)
 243 {
 244         unsigned int i;
 245
 246         if (entity == NULL)
 247                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 248
 249         list_for_each_entry_continue(entity, &dev->entities, list) {
 250                 switch (UVC_ENTITY_TYPE(entity)) {
 251                 case TT_STREAMING:
 252                         if (entity->output.bSourceID == id)
 253                                 return entity;
 254                         break;
 255
 256                 case VC_PROCESSING_UNIT:
 257                         if (entity->processing.bSourceID == id)
 258                                 return entity;
 259                         break;
 260
 261                 case VC_SELECTOR_UNIT:
 262                         for (i = 0; i < entity->selector.bNrInPins; ++i)
 263                                 if (entity->selector.baSourceID[i] == id)
 264                                         return entity;
 265                         break;
 266
 267                 case VC_EXTENSION_UNIT:
 268                         for (i = 0; i < entity->extension.bNrInPins; ++i)
 269                                 if (entity->extension.baSourceID[i] == id)
 270                                         return entity;
 271                         break;
 272                 }
 273         }
 274
 275         return NULL;
 276 }
 277
 278 /* ------------------------------------------------------------------------
 279  * Descriptors handling
 280  */
 281
 282 static int uvc_parse_format(struct uvc_device *dev,
 283         struct uvc_streaming *streaming, struct uvc_format *format,
 284         __u32 **intervals, unsigned char *buffer, int buflen)
 285 {
 286         struct usb_interface *intf = streaming->intf;
 287         struct usb_host_interface *alts = intf->cur_altsetting;
 288         struct uvc_format_desc *fmtdesc;
 289         struct uvc_frame *frame;
 290         const unsigned char *start = buffer;
 291         unsigned int interval;
 292         unsigned int i, n;
 293         __u8 ftype;
 294
 295         format->type = buffer[2];
 296         format->index = buffer[3];
 297
 298         switch (buffer[2]) {
 299         case VS_FORMAT_UNCOMPRESSED:
 300         case VS_FORMAT_FRAME_BASED:
 301                 n = buffer[2] == VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 302                 if (buflen < n) {
 303                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 304                                "interface %d FORMAT error\n",
 305                                dev->udev->devnum,
 306                                alts->desc.bInterfaceNumber);
 307                         return -EINVAL;
 308                 }
 309
 310                 /* Find the format descriptor from its GUID. */
 311                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 312
 313                 if (fmtdesc != NULL) {
 314                         strncpy(format->name, fmtdesc->name,
 315                                 sizeof format->name);
 316                         format->fcc = fmtdesc->fcc;
 317                 } else {
 318                         uvc_printk(KERN_INFO, "Unknown video format "
 319                                 UVC_GUID_FORMAT "\n",
 320                                 UVC_GUID_ARGS(&buffer[5]));
 321                         snprintf(format->name, sizeof format->name,
 322                                 UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
 323                         format->fcc = 0;
 324                 }
 325
 326                 format->bpp = buffer[21];
 327                 if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
 328                         ftype = VS_FRAME_UNCOMPRESSED;
 329                 } else {
 330                         ftype = VS_FRAME_FRAME_BASED;
 331                         if (buffer[27])
 332                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 333                 }
 334                 break;
 335
 336         case VS_FORMAT_MJPEG:
 337                 if (buflen < 11) {
 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                 strncpy(format->name, "MJPEG", sizeof format->name);
 346                 format->fcc = V4L2_PIX_FMT_MJPEG;
 347                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 348                 format->bpp = 0;
 349                 ftype = VS_FRAME_MJPEG;
 350                 break;
 351
 352         case VS_FORMAT_DV:
 353                 if (buflen < 9) {
 354                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 355                                "interface %d FORMAT error\n",
 356                                dev->udev->devnum,
 357                                alts->desc.bInterfaceNumber);
 358                         return -EINVAL;
 359                 }
 360
 361                 switch (buffer[8] & 0x7f) {
 362                 case 0:
 363                         strncpy(format->name, "SD-DV", sizeof format->name);
 364                         break;
 365                 case 1:
 366                         strncpy(format->name, "SDL-DV", sizeof format->name);
 367                         break;
 368                 case 2:
 369                         strncpy(format->name, "HD-DV", sizeof format->name);
 370                         break;
 371                 default:
 372                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 373                                "interface %d: unknown DV format %u\n",
 374                                dev->udev->devnum,
 375                                alts->desc.bInterfaceNumber, buffer[8]);
 376                         return -EINVAL;
 377                 }
 378
 379                 strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 380                         sizeof format->name);
 381
 382                 format->fcc = V4L2_PIX_FMT_DV;
 383                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 384                 format->bpp = 0;
 385                 ftype = 0;
 386
 387                 /* Create a dummy frame descriptor. */
 388                 frame = &format->frame[0];
 389                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 390                 frame->bFrameIntervalType = 1;
 391                 frame->dwDefaultFrameInterval = 1;
 392                 frame->dwFrameInterval = *intervals;
 393                 *(*intervals)++ = 1;
 394                 format->nframes = 1;
 395                 break;
 396
 397         case VS_FORMAT_MPEG2TS:
 398         case VS_FORMAT_STREAM_BASED:
 399                 /* Not supported yet. */
 400         default:
 401                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 402                        "interface %d unsupported format %u\n",
 403                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 404                        buffer[2]);
 405                 return -EINVAL;
 406         }
 407
 408         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 409
 410         buflen -= buffer[0];
 411         buffer += buffer[0];
 412
 413         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 414          * based formats have frame descriptors.
 415          */
 416         while (buflen > 2 && buffer[2] == ftype) {
 417                 frame = &format->frame[format->nframes];
 418
 419                 if (ftype != VS_FRAME_FRAME_BASED)
 420                         n = buflen > 25 ? buffer[25] : 0;
 421                 else
 422                         n = buflen > 21 ? buffer[21] : 0;
 423
 424                 n = n ? n : 3;
 425
 426                 if (buflen < 26 + 4*n) {
 427                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 428                                "interface %d FRAME error\n", dev->udev->devnum,
 429                                alts->desc.bInterfaceNumber);
 430                         return -EINVAL;
 431                 }
 432
 433                 frame->bFrameIndex = buffer[3];
 434                 frame->bmCapabilities = buffer[4];
 435                 frame->wWidth = le16_to_cpup((__le16 *)&buffer[5]);
 436                 frame->wHeight = le16_to_cpup((__le16 *)&buffer[7]);
 437                 frame->dwMinBitRate = le32_to_cpup((__le32 *)&buffer[9]);
 438                 frame->dwMaxBitRate = le32_to_cpup((__le32 *)&buffer[13]);
 439                 if (ftype != VS_FRAME_FRAME_BASED) {
 440                         frame->dwMaxVideoFrameBufferSize =
 441                                 le32_to_cpup((__le32 *)&buffer[17]);
 442                         frame->dwDefaultFrameInterval =
 443                                 le32_to_cpup((__le32 *)&buffer[21]);
 444                         frame->bFrameIntervalType = buffer[25];
 445                 } else {
 446                         frame->dwMaxVideoFrameBufferSize = 0;
 447                         frame->dwDefaultFrameInterval =
 448                                 le32_to_cpup((__le32 *)&buffer[17]);
 449                         frame->bFrameIntervalType = buffer[21];
 450                 }
 451                 frame->dwFrameInterval = *intervals;
 452
 453                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 454                  * completely. Observed behaviours range from setting the
 455                  * value to 1.1x the actual frame size of hardwiring the
 456                  * 16 low bits to 0. This results in a higher than necessary
 457                  * memory usage as well as a wrong image size information. For
 458                  * uncompressed formats this can be fixed by computing the
 459                  * value from the frame size.
 460                  */
 461                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 462                         frame->dwMaxVideoFrameBufferSize = format->bpp
 463                                 * frame->wWidth * frame->wHeight / 8;
 464
 465                 /* Some bogus devices report dwMinFrameInterval equal to
 466                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 467                  * zero. Setting all null intervals to 1 fixes the problem and
 468                  * some other divisions by zero which could happen.
 469                  */
 470                 for (i = 0; i < n; ++i) {
 471                         interval = le32_to_cpup((__le32 *)&buffer[26+4*i]);
 472                         *(*intervals)++ = interval ? interval : 1;
 473                 }
 474
 475                 /* Make sure that the default frame interval stays between
 476                  * the boundaries.
 477                  */
 478                 n -= frame->bFrameIntervalType ? 1 : 2;
 479                 frame->dwDefaultFrameInterval =
 480                         min(frame->dwFrameInterval[n],
 481                             max(frame->dwFrameInterval[0],
 482                                 frame->dwDefaultFrameInterval));
 483
 484                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 485                         frame->wWidth, frame->wHeight,
 486                         10000000/frame->dwDefaultFrameInterval,
 487                         (100000000/frame->dwDefaultFrameInterval)%10);
 488
 489                 format->nframes++;
 490                 buflen -= buffer[0];
 491                 buffer += buffer[0];
 492         }
 493
 494         if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
 495                 buflen -= buffer[0];
 496                 buffer += buffer[0];
 497         }
 498
 499         if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
 500                 if (buflen < 6) {
 501                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
 502                                "interface %d COLORFORMAT error\n",
 503                                dev->udev->devnum,
 504                                alts->desc.bInterfaceNumber);
 505                         return -EINVAL;
 506                 }
 507
 508                 format->colorspace = uvc_colorspace(buffer[3]);
 509
 510                 buflen -= buffer[0];
 511                 buffer += buffer[0];
 512         }
 513
 514         return buffer - start;
 515 }
 516
 517 static int uvc_parse_streaming(struct uvc_device *dev,
 518         struct usb_interface *intf)
 519 {
 520         struct uvc_streaming *streaming = NULL;
 521         struct uvc_format *format;
 522         struct uvc_frame *frame;
 523         struct usb_host_interface *alts = &intf->altsetting[0];
 524         unsigned char *_buffer, *buffer = alts->extra;
 525         int _buflen, buflen = alts->extralen;
 526         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 527         unsigned int size, i, n, p;
 528         __u32 *interval;
 529         __u16 psize;
 530         int ret = -EINVAL;
 531
 532         if (intf->cur_altsetting->desc.bInterfaceSubClass
 533                 != SC_VIDEOSTREAMING) {
 534                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 535                         "video streaming interface\n", dev->udev->devnum,
 536                         intf->altsetting[0].desc.bInterfaceNumber);
 537                 return -EINVAL;
 538         }
 539
 540         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 541                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 542                         "claimed\n", dev->udev->devnum,
 543                         intf->altsetting[0].desc.bInterfaceNumber);
 544                 return -EINVAL;
 545         }
 546
 547         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 548         if (streaming == NULL) {
 549                 usb_driver_release_interface(&uvc_driver.driver, intf);
 550                 return -EINVAL;
 551         }
 552
 553         mutex_init(&streaming->mutex);
 554         streaming->intf = usb_get_intf(intf);
 555         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 556
 557         /* The Pico iMage webcam has its class-specific interface descriptors
 558          * after the endpoint descriptors.
 559          */
 560         if (buflen == 0) {
 561                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 562                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 563
 564                         if (ep->extralen == 0)
 565                                 continue;
 566
 567                         if (ep->extralen > 2 &&
 568                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 569                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 570                                         "from endpoint %u.\n", i);
 571                                 buffer = alts->endpoint[i].extra;
 572                                 buflen = alts->endpoint[i].extralen;
 573                                 break;
 574                         }
 575                 }
 576         }
 577
 578         /* Skip the standard interface descriptors. */
 579         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 580                 buflen -= buffer[0];
 581                 buffer += buffer[0];
 582         }
 583
 584         if (buflen <= 2) {
 585                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 586                         "interface descriptors found.\n");
 587                 goto error;
 588         }
 589
 590         /* Parse the header descriptor. */
 591         if (buffer[2] == VS_OUTPUT_HEADER) {
 592                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 593                         "%d OUTPUT HEADER descriptor is not supported.\n",
 594                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 595                 goto error;
 596         } else if (buffer[2] == VS_INPUT_HEADER) {
 597                 p = buflen >= 5 ? buffer[3] : 0;
 598                 n = buflen >= 12 ? buffer[12] : 0;
 599
 600                 if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
 601                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 602                                 "interface %d INPUT HEADER descriptor is "
 603                                 "invalid.\n", dev->udev->devnum,
 604                                 alts->desc.bInterfaceNumber);
 605                         goto error;
 606                 }
 607
 608                 streaming->header.bNumFormats = p;
 609                 streaming->header.bEndpointAddress = buffer[6];
 610                 streaming->header.bmInfo = buffer[7];
 611                 streaming->header.bTerminalLink = buffer[8];
 612                 streaming->header.bStillCaptureMethod = buffer[9];
 613                 streaming->header.bTriggerSupport = buffer[10];
 614                 streaming->header.bTriggerUsage = buffer[11];
 615                 streaming->header.bControlSize = n;
 616
 617                 streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
 618                 if (streaming->header.bmaControls == NULL) {
 619                         ret = -ENOMEM;
 620                         goto error;
 621                 }
 622
 623                 memcpy(streaming->header.bmaControls, &buffer[13], p*n);
 624         } else {
 625                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 626                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 627                         alts->desc.bInterfaceNumber);
 628                 goto error;
 629         }
 630
 631         buflen -= buffer[0];
 632         buffer += buffer[0];
 633
 634         _buffer = buffer;
 635         _buflen = buflen;
 636
 637         /* Count the format and frame descriptors. */
 638         while (_buflen > 2) {
 639                 switch (_buffer[2]) {
 640                 case VS_FORMAT_UNCOMPRESSED:
 641                 case VS_FORMAT_MJPEG:
 642                 case VS_FORMAT_FRAME_BASED:
 643                         nformats++;
 644                         break;
 645
 646                 case VS_FORMAT_DV:
 647                         /* DV format has no frame descriptor. We will create a
 648                          * dummy frame descriptor with a dummy frame interval.
 649                          */
 650                         nformats++;
 651                         nframes++;
 652                         nintervals++;
 653                         break;
 654
 655                 case VS_FORMAT_MPEG2TS:
 656                 case VS_FORMAT_STREAM_BASED:
 657                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 658                                 "interface %d FORMAT %u is not supported.\n",
 659                                 dev->udev->devnum,
 660                                 alts->desc.bInterfaceNumber, _buffer[2]);
 661                         break;
 662
 663                 case VS_FRAME_UNCOMPRESSED:
 664                 case VS_FRAME_MJPEG:
 665                         nframes++;
 666                         if (_buflen > 25)
 667                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 668                         break;
 669
 670                 case VS_FRAME_FRAME_BASED:
 671                         nframes++;
 672                         if (_buflen > 21)
 673                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 674                         break;
 675                 }
 676
 677                 _buflen -= _buffer[0];
 678                 _buffer += _buffer[0];
 679         }
 680
 681         if (nformats == 0) {
 682                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 683                         "%d has no supported formats defined.\n",
 684                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 685                 goto error;
 686         }
 687
 688         size = nformats * sizeof *format + nframes * sizeof *frame
 689              + nintervals * sizeof *interval;
 690         format = kzalloc(size, GFP_KERNEL);
 691         if (format == NULL) {
 692                 ret = -ENOMEM;
 693                 goto error;
 694         }
 695
 696         frame = (struct uvc_frame *)&format[nformats];
 697         interval = (__u32 *)&frame[nframes];
 698
 699         streaming->format = format;
 700         streaming->nformats = nformats;
 701
 702         /* Parse the format descriptors. */
 703         while (buflen > 2) {
 704                 switch (buffer[2]) {
 705                 case VS_FORMAT_UNCOMPRESSED:
 706                 case VS_FORMAT_MJPEG:
 707                 case VS_FORMAT_DV:
 708                 case VS_FORMAT_FRAME_BASED:
 709                         format->frame = frame;
 710                         ret = uvc_parse_format(dev, streaming, format,
 711                                 &interval, buffer, buflen);
 712                         if (ret < 0)
 713                                 goto error;
 714
 715                         frame += format->nframes;
 716                         format++;
 717
 718                         buflen -= ret;
 719                         buffer += ret;
 720                         continue;
 721
 722                 default:
 723                         break;
 724                 }
 725
 726                 buflen -= buffer[0];
 727                 buffer += buffer[0];
 728         }
 729
 730         /* Parse the alternate settings to find the maximum bandwidth. */
 731         for (i = 0; i < intf->num_altsetting; ++i) {
 732                 struct usb_host_endpoint *ep;
 733                 alts = &intf->altsetting[i];
 734                 ep = uvc_find_endpoint(alts,
 735                                 streaming->header.bEndpointAddress);
 736                 if (ep == NULL)
 737                         continue;
 738
 739                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 740                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 741                 if (psize > streaming->maxpsize)
 742                         streaming->maxpsize = psize;
 743         }
 744
 745         list_add_tail(&streaming->list, &dev->streaming);
 746         return 0;
 747
 748 error:
 749         usb_driver_release_interface(&uvc_driver.driver, intf);
 750         usb_put_intf(intf);
 751         kfree(streaming->format);
 752         kfree(streaming->header.bmaControls);
 753         kfree(streaming);
 754         return ret;
 755 }
 756
 757 /* Parse vendor-specific extensions. */
 758 static int uvc_parse_vendor_control(struct uvc_device *dev,
 759         const unsigned char *buffer, int buflen)
 760 {
 761         struct usb_device *udev = dev->udev;
 762         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 763         struct uvc_entity *unit;
 764         unsigned int n, p;
 765         int handled = 0;
 766
 767         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 768         case 0x046d:            /* Logitech */
 769                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 770                         break;
 771
 772                 /* Logitech implements several vendor specific functions
 773                  * through vendor specific extension units (LXU).
 774                  *
 775                  * The LXU descriptors are similar to XU descriptors
 776                  * (see "USB Device Video Class for Video Devices", section
 777                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 778                  * differences:
 779                  *
 780                  * ----------------------------------------------------------
 781                  * 0            bLength         1        Number
 782                  *      Size of this descriptor, in bytes: 24+p+n*2
 783                  * ----------------------------------------------------------
 784                  * 23+p+n       bmControlsType  N       Bitmap
 785                  *      Individual bits in the set are defined:
 786                  *      0: Absolute
 787                  *      1: Relative
 788                  *
 789                  *      This bitset is mapped exactly the same as bmControls.
 790                  * ----------------------------------------------------------
 791                  * 23+p+n*2     bReserved       1       Boolean
 792                  * ----------------------------------------------------------
 793                  * 24+p+n*2     iExtension      1       Index
 794                  *      Index of a string descriptor that describes this
 795                  *      extension unit.
 796                  * ----------------------------------------------------------
 797                  */
 798                 p = buflen >= 22 ? buffer[21] : 0;
 799                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 800
 801                 if (buflen < 25 + p + 2*n) {
 802                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 803                                 "interface %d EXTENSION_UNIT error\n",
 804                                 udev->devnum, alts->desc.bInterfaceNumber);
 805                         break;
 806                 }
 807
 808                 unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
 809                 if (unit == NULL)
 810                         return -ENOMEM;
 811
 812                 unit->id = buffer[3];
 813                 unit->type = VC_EXTENSION_UNIT;
 814                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 815                 unit->extension.bNumControls = buffer[20];
 816                 unit->extension.bNrInPins =
 817                         le16_to_cpup((__le16 *)&buffer[21]);
 818                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
 819                 memcpy(unit->extension.baSourceID, &buffer[22], p);
 820                 unit->extension.bControlSize = buffer[22+p];
 821                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
 822                 unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
 823                                                + p + n;
 824                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 825
 826                 if (buffer[24+p+2*n] != 0)
 827                         usb_string(udev, buffer[24+p+2*n], unit->name,
 828                                    sizeof unit->name);
 829                 else
 830                         sprintf(unit->name, "Extension %u", buffer[3]);
 831
 832                 list_add_tail(&unit->list, &dev->entities);
 833                 handled = 1;
 834                 break;
 835         }
 836
 837         return handled;
 838 }
 839
 840 static int uvc_parse_standard_control(struct uvc_device *dev,
 841         const unsigned char *buffer, int buflen)
 842 {
 843         struct usb_device *udev = dev->udev;
 844         struct uvc_entity *unit, *term;
 845         struct usb_interface *intf;
 846         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 847         unsigned int i, n, p, len;
 848         __u16 type;
 849
 850         switch (buffer[2]) {
 851         case VC_HEADER:
 852                 n = buflen >= 12 ? buffer[11] : 0;
 853
 854                 if (buflen < 12 || buflen < 12 + n) {
 855                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 856                                 "interface %d HEADER error\n", udev->devnum,
 857                                 alts->desc.bInterfaceNumber);
 858                         return -EINVAL;
 859                 }
 860
 861                 dev->uvc_version = le16_to_cpup((__le16 *)&buffer[3]);
 862                 dev->clock_frequency = le32_to_cpup((__le32 *)&buffer[7]);
 863
 864                 /* Parse all USB Video Streaming interfaces. */
 865                 for (i = 0; i < n; ++i) {
 866                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
 867                         if (intf == NULL) {
 868                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
 869                                         "interface %d doesn't exists\n",
 870                                         udev->devnum, i);
 871                                 continue;
 872                         }
 873
 874                         uvc_parse_streaming(dev, intf);
 875                 }
 876                 break;
 877
 878         case VC_INPUT_TERMINAL:
 879                 if (buflen < 8) {
 880                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 881                                 "interface %d INPUT_TERMINAL error\n",
 882                                 udev->devnum, alts->desc.bInterfaceNumber);
 883                         return -EINVAL;
 884                 }
 885
 886                 /* Make sure the terminal type MSB is not null, otherwise it
 887                  * could be confused with a unit.
 888                  */
 889                 type = le16_to_cpup((__le16 *)&buffer[4]);
 890                 if ((type & 0xff00) == 0) {
 891                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 892                                 "interface %d INPUT_TERMINAL %d has invalid "
 893                                 "type 0x%04x, skipping\n", udev->devnum,
 894                                 alts->desc.bInterfaceNumber,
 895                                 buffer[3], type);
 896                         return 0;
 897                 }
 898
 899                 n = 0;
 900                 p = 0;
 901                 len = 8;
 902
 903                 if (type == ITT_CAMERA) {
 904                         n = buflen >= 15 ? buffer[14] : 0;
 905                         len = 15;
 906
 907                 } else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
 908                         n = buflen >= 9 ? buffer[8] : 0;
 909                         p = buflen >= 10 + n ? buffer[9+n] : 0;
 910                         len = 10;
 911                 }
 912
 913                 if (buflen < len + n + p) {
 914                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 915                                 "interface %d INPUT_TERMINAL error\n",
 916                                 udev->devnum, alts->desc.bInterfaceNumber);
 917                         return -EINVAL;
 918                 }
 919
 920                 term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
 921                 if (term == NULL)
 922                         return -ENOMEM;
 923
 924                 term->id = buffer[3];
 925                 term->type = type | UVC_TERM_INPUT;
 926
 927                 if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
 928                         term->camera.bControlSize = n;
 929                         term->camera.bmControls = (__u8 *)term + sizeof *term;
 930                         term->camera.wObjectiveFocalLengthMin =
 931                                 le16_to_cpup((__le16 *)&buffer[8]);
 932                         term->camera.wObjectiveFocalLengthMax =
 933                                 le16_to_cpup((__le16 *)&buffer[10]);
 934                         term->camera.wOcularFocalLength =
 935                                 le16_to_cpup((__le16 *)&buffer[12]);
 936                         memcpy(term->camera.bmControls, &buffer[15], n);
 937                 } else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
 938                         term->media.bControlSize = n;
 939                         term->media.bmControls = (__u8 *)term + sizeof *term;
 940                         term->media.bTransportModeSize = p;
 941                         term->media.bmTransportModes = (__u8 *)term
 942                                                      + sizeof *term + n;
 943                         memcpy(term->media.bmControls, &buffer[9], n);
 944                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
 945                 }
 946
 947                 if (buffer[7] != 0)
 948                         usb_string(udev, buffer[7], term->name,
 949                                    sizeof term->name);
 950                 else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
 951                         sprintf(term->name, "Camera %u", buffer[3]);
 952                 else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
 953                         sprintf(term->name, "Media %u", buffer[3]);
 954                 else
 955                         sprintf(term->name, "Input %u", buffer[3]);
 956
 957                 list_add_tail(&term->list, &dev->entities);
 958                 break;
 959
 960         case VC_OUTPUT_TERMINAL:
 961                 if (buflen < 9) {
 962                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 963                                 "interface %d OUTPUT_TERMINAL error\n",
 964                                 udev->devnum, alts->desc.bInterfaceNumber);
 965                         return -EINVAL;
 966                 }
 967
 968                 /* Make sure the terminal type MSB is not null, otherwise it
 969                  * could be confused with a unit.
 970                  */
 971                 type = le16_to_cpup((__le16 *)&buffer[4]);
 972                 if ((type & 0xff00) == 0) {
 973                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 974                                 "interface %d OUTPUT_TERMINAL %d has invalid "
 975                                 "type 0x%04x, skipping\n", udev->devnum,
 976                                 alts->desc.bInterfaceNumber, buffer[3], type);
 977                         return 0;
 978                 }
 979
 980                 term = kzalloc(sizeof *term, GFP_KERNEL);
 981                 if (term == NULL)
 982                         return -ENOMEM;
 983
 984                 term->id = buffer[3];
 985                 term->type = type | UVC_TERM_OUTPUT;
 986                 term->output.bSourceID = buffer[7];
 987
 988                 if (buffer[8] != 0)
 989                         usb_string(udev, buffer[8], term->name,
 990                                    sizeof term->name);
 991                 else
 992                         sprintf(term->name, "Output %u", buffer[3]);
 993
 994                 list_add_tail(&term->list, &dev->entities);
 995                 break;
 996
 997         case VC_SELECTOR_UNIT:
 998                 p = buflen >= 5 ? buffer[4] : 0;
 999
1000                 if (buflen < 5 || buflen < 6 + p) {
1001                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1002                                 "interface %d SELECTOR_UNIT error\n",
1003                                 udev->devnum, alts->desc.bInterfaceNumber);
1004                         return -EINVAL;
1005                 }
1006
1007                 unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
1008                 if (unit == NULL)
1009                         return -ENOMEM;
1010
1011                 unit->id = buffer[3];
1012                 unit->type = buffer[2];
1013                 unit->selector.bNrInPins = buffer[4];
1014                 unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
1015                 memcpy(unit->selector.baSourceID, &buffer[5], p);
1016
1017                 if (buffer[5+p] != 0)
1018                         usb_string(udev, buffer[5+p], unit->name,
1019                                    sizeof unit->name);
1020                 else
1021                         sprintf(unit->name, "Selector %u", buffer[3]);
1022
1023                 list_add_tail(&unit->list, &dev->entities);
1024                 break;
1025
1026         case VC_PROCESSING_UNIT:
1027                 n = buflen >= 8 ? buffer[7] : 0;
1028                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1029
1030                 if (buflen < p + n) {
1031                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1032                                 "interface %d PROCESSING_UNIT error\n",
1033                                 udev->devnum, alts->desc.bInterfaceNumber);
1034                         return -EINVAL;
1035                 }
1036
1037                 unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
1038                 if (unit == NULL)
1039                         return -ENOMEM;
1040
1041                 unit->id = buffer[3];
1042                 unit->type = buffer[2];
1043                 unit->processing.bSourceID = buffer[4];
1044                 unit->processing.wMaxMultiplier =
1045                         le16_to_cpup((__le16 *)&buffer[5]);
1046                 unit->processing.bControlSize = buffer[7];
1047                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1048                 memcpy(unit->processing.bmControls, &buffer[8], n);
1049                 if (dev->uvc_version >= 0x0110)
1050                         unit->processing.bmVideoStandards = buffer[9+n];
1051
1052                 if (buffer[8+n] != 0)
1053                         usb_string(udev, buffer[8+n], unit->name,
1054                                    sizeof unit->name);
1055                 else
1056                         sprintf(unit->name, "Processing %u", buffer[3]);
1057
1058                 list_add_tail(&unit->list, &dev->entities);
1059                 break;
1060
1061         case VC_EXTENSION_UNIT:
1062                 p = buflen >= 22 ? buffer[21] : 0;
1063                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1064
1065                 if (buflen < 24 + p + n) {
1066                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1067                                 "interface %d EXTENSION_UNIT error\n",
1068                                 udev->devnum, alts->desc.bInterfaceNumber);
1069                         return -EINVAL;
1070                 }
1071
1072                 unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
1073                 if (unit == NULL)
1074                         return -ENOMEM;
1075
1076                 unit->id = buffer[3];
1077                 unit->type = buffer[2];
1078                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1079                 unit->extension.bNumControls = buffer[20];
1080                 unit->extension.bNrInPins =
1081                         le16_to_cpup((__le16 *)&buffer[21]);
1082                 unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
1083                 memcpy(unit->extension.baSourceID, &buffer[22], p);
1084                 unit->extension.bControlSize = buffer[22+p];
1085                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
1086                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1087
1088                 if (buffer[23+p+n] != 0)
1089                         usb_string(udev, buffer[23+p+n], unit->name,
1090                                    sizeof unit->name);
1091                 else
1092                         sprintf(unit->name, "Extension %u", buffer[3]);
1093
1094                 list_add_tail(&unit->list, &dev->entities);
1095                 break;
1096
1097         default:
1098                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1099                         "descriptor (%u)\n", buffer[2]);
1100                 break;
1101         }
1102
1103         return 0;
1104 }
1105
1106 static int uvc_parse_control(struct uvc_device *dev)
1107 {
1108         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1109         unsigned char *buffer = alts->extra;
1110         int buflen = alts->extralen;
1111         int ret;
1112
1113         /* Parse the default alternate setting only, as the UVC specification
1114          * defines a single alternate setting, the default alternate setting
1115          * zero.
1116          */
1117
1118         while (buflen > 2) {
1119                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1120                     buffer[1] != USB_DT_CS_INTERFACE)
1121                         goto next_descriptor;
1122
1123                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1124                         return ret;
1125
1126 next_descriptor:
1127                 buflen -= buffer[0];
1128                 buffer += buffer[0];
1129         }
1130
1131         /* Check if the optional status endpoint is present. */
1132         if (alts->desc.bNumEndpoints == 1) {
1133                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1134                 struct usb_endpoint_descriptor *desc = &ep->desc;
1135
1136                 if (usb_endpoint_is_int_in(desc) &&
1137                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1138                     desc->bInterval != 0) {
1139                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1140                                 "(addr %02x).\n", desc->bEndpointAddress);
1141                         dev->int_ep = ep;
1142                 }
1143         }
1144
1145         return 0;
1146 }
1147
1148 /* ------------------------------------------------------------------------
1149  * USB probe and disconnect
1150  */
1151
1152 /*
1153  * Unregister the video devices.
1154  */
1155 static void uvc_unregister_video(struct uvc_device *dev)
1156 {
1157         if (dev->video.vdev) {
1158                 if (dev->video.vdev->minor == -1)
1159                         video_device_release(dev->video.vdev);
1160                 else
1161                         video_unregister_device(dev->video.vdev);
1162                 dev->video.vdev = NULL;
1163         }
1164 }
1165
1166 /*
1167  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1168  * and containing the following units:
1169  *
1170  * - a USB Streaming Output Terminal
1171  * - zero or one Processing Unit
1172  * - zero, one or mode single-input Selector Units
1173  * - zero or one multiple-input Selector Units, provided all inputs are
1174  *   connected to input terminals
1175  * - zero, one or mode single-input Extension Units
1176  * - one Camera Input Terminal, or one or more External terminals.
1177  *
1178  * A side forward scan is made on each detected entity to check for additional
1179  * extension units.
1180  */
1181 static int uvc_scan_chain_entity(struct uvc_video_device *video,
1182         struct uvc_entity *entity)
1183 {
1184         switch (UVC_ENTITY_TYPE(entity)) {
1185         case VC_EXTENSION_UNIT:
1186                 if (uvc_trace_param & UVC_TRACE_PROBE)
1187                         printk(" <- XU %d", entity->id);
1188
1189                 if (entity->extension.bNrInPins != 1) {
1190                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1191                                 "than 1 input pin.\n", entity->id);
1192                         return -1;
1193                 }
1194
1195                 list_add_tail(&entity->chain, &video->extensions);
1196                 break;
1197
1198         case VC_PROCESSING_UNIT:
1199                 if (uvc_trace_param & UVC_TRACE_PROBE)
1200                         printk(" <- PU %d", entity->id);
1201
1202                 if (video->processing != NULL) {
1203                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1204                                 "Processing Units in chain.\n");
1205                         return -1;
1206                 }
1207
1208                 video->processing = entity;
1209                 break;
1210
1211         case VC_SELECTOR_UNIT:
1212                 if (uvc_trace_param & UVC_TRACE_PROBE)
1213                         printk(" <- SU %d", entity->id);
1214
1215                 /* Single-input selector units are ignored. */
1216                 if (entity->selector.bNrInPins == 1)
1217                         break;
1218
1219                 if (video->selector != NULL) {
1220                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1221                                 "Units in chain.\n");
1222                         return -1;
1223                 }
1224
1225                 video->selector = entity;
1226                 break;
1227
1228         case ITT_VENDOR_SPECIFIC:
1229         case ITT_CAMERA:
1230         case ITT_MEDIA_TRANSPORT_INPUT:
1231                 if (uvc_trace_param & UVC_TRACE_PROBE)
1232                         printk(" <- IT %d\n", entity->id);
1233
1234                 list_add_tail(&entity->chain, &video->iterms);
1235                 break;
1236
1237         default:
1238                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1239                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1240                 return -1;
1241         }
1242
1243         return 0;
1244 }
1245
1246 static int uvc_scan_chain_forward(struct uvc_video_device *video,
1247         struct uvc_entity *entity, struct uvc_entity *prev)
1248 {
1249         struct uvc_entity *forward;
1250         int found;
1251
1252         /* Forward scan */
1253         forward = NULL;
1254         found = 0;
1255
1256         while (1) {
1257                 forward = uvc_entity_by_reference(video->dev, entity->id,
1258                         forward);
1259                 if (forward == NULL)
1260                         break;
1261
1262                 if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
1263                     forward == prev)
1264                         continue;
1265
1266                 if (forward->extension.bNrInPins != 1) {
1267                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
1268                                 "more than 1 input pin.\n", entity->id);
1269                         return -1;
1270                 }
1271
1272                 list_add_tail(&forward->chain, &video->extensions);
1273                 if (uvc_trace_param & UVC_TRACE_PROBE) {
1274                         if (!found)
1275                                 printk(" (-> XU");
1276
1277                         printk(" %d", forward->id);
1278                         found = 1;
1279                 }
1280         }
1281         if (found)
1282                 printk(")");
1283
1284         return 0;
1285 }
1286
1287 static int uvc_scan_chain_backward(struct uvc_video_device *video,
1288         struct uvc_entity *entity)
1289 {
1290         struct uvc_entity *term;
1291         int id = -1, i;
1292
1293         switch (UVC_ENTITY_TYPE(entity)) {
1294         case VC_EXTENSION_UNIT:
1295                 id = entity->extension.baSourceID[0];
1296                 break;
1297
1298         case VC_PROCESSING_UNIT:
1299                 id = entity->processing.bSourceID;
1300                 break;
1301
1302         case VC_SELECTOR_UNIT:
1303                 /* Single-input selector units are ignored. */
1304                 if (entity->selector.bNrInPins == 1) {
1305                         id = entity->selector.baSourceID[0];
1306                         break;
1307                 }
1308
1309                 if (uvc_trace_param & UVC_TRACE_PROBE)
1310                         printk(" <- IT");
1311
1312                 video->selector = entity;
1313                 for (i = 0; i < entity->selector.bNrInPins; ++i) {
1314                         id = entity->selector.baSourceID[i];
1315                         term = uvc_entity_by_id(video->dev, id);
1316                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1317                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1318                                         "input %d isn't connected to an "
1319                                         "input terminal\n", entity->id, i);
1320                                 return -1;
1321                         }
1322
1323                         if (uvc_trace_param & UVC_TRACE_PROBE)
1324                                 printk(" %d", term->id);
1325
1326                         list_add_tail(&term->chain, &video->iterms);
1327                         uvc_scan_chain_forward(video, term, entity);
1328                 }
1329
1330                 if (uvc_trace_param & UVC_TRACE_PROBE)
1331                         printk("\n");
1332
1333                 id = 0;
1334                 break;
1335         }
1336
1337         return id;
1338 }
1339
1340 static int uvc_scan_chain(struct uvc_video_device *video)
1341 {
1342         struct uvc_entity *entity, *prev;
1343         int id;
1344
1345         entity = video->oterm;
1346         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
1347         id = entity->output.bSourceID;
1348         while (id != 0) {
1349                 prev = entity;
1350                 entity = uvc_entity_by_id(video->dev, id);
1351                 if (entity == NULL) {
1352                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1353                                 "unknown entity %d.\n", id);
1354                         return -1;
1355                 }
1356
1357                 /* Process entity */
1358                 if (uvc_scan_chain_entity(video, entity) < 0)
1359                         return -1;
1360
1361                 /* Forward scan */
1362                 if (uvc_scan_chain_forward(video, entity, prev) < 0)
1363                         return -1;
1364
1365                 /* Stop when a terminal is found. */
1366                 if (!UVC_ENTITY_IS_UNIT(entity))
1367                         break;
1368
1369                 /* Backward scan */
1370                 id = uvc_scan_chain_backward(video, entity);
1371                 if (id < 0)
1372                         return id;
1373         }
1374
1375         /* Initialize the video buffers queue. */
1376         uvc_queue_init(&video->queue);
1377
1378         return 0;
1379 }
1380
1381 /*
1382  * Register the video devices.
1383  *
1384  * The driver currently supports a single video device per control interface
1385  * only. The terminal and units must match the following structure:
1386  *
1387  * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
1388  *
1389  * The Extension Units, if present, must have a single input pin. The
1390  * Processing Unit and Extension Units can be in any order. Additional
1391  * Extension Units connected to the main chain as single-unit branches are
1392  * also supported.
1393  */
1394 static int uvc_register_video(struct uvc_device *dev)
1395 {
1396         struct video_device *vdev;
1397         struct uvc_entity *term;
1398         int found = 0, ret;
1399
1400         /* Check if the control interface matches the structure we expect. */
1401         list_for_each_entry(term, &dev->entities, list) {
1402                 struct uvc_streaming *streaming;
1403
1404                 if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
1405                         continue;
1406
1407                 memset(&dev->video, 0, sizeof dev->video);
1408                 mutex_init(&dev->video.ctrl_mutex);
1409                 INIT_LIST_HEAD(&dev->video.iterms);
1410                 INIT_LIST_HEAD(&dev->video.extensions);
1411                 dev->video.oterm = term;
1412                 dev->video.dev = dev;
1413                 if (uvc_scan_chain(&dev->video) < 0)
1414                         continue;
1415
1416                 list_for_each_entry(streaming, &dev->streaming, list) {
1417                         if (streaming->header.bTerminalLink == term->id) {
1418                                 dev->video.streaming = streaming;
1419                                 found = 1;
1420                                 break;
1421                         }
1422                 }
1423
1424                 if (found)
1425                         break;
1426         }
1427
1428         if (!found) {
1429                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1430                 return -1;
1431         }
1432
1433         if (uvc_trace_param & UVC_TRACE_PROBE) {
1434                 uvc_printk(KERN_INFO, "Found a valid video chain (");
1435                 list_for_each_entry(term, &dev->video.iterms, chain) {
1436                         printk("%d", term->id);
1437                         if (term->chain.next != &dev->video.iterms)
1438                                 printk(",");
1439                 }
1440                 printk(" -> %d).\n", dev->video.oterm->id);
1441         }
1442
1443         /* Initialize the streaming interface with default streaming
1444          * parameters.
1445          */
1446         if ((ret = uvc_video_init(&dev->video)) < 0) {
1447                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1448                         "(%d).\n", ret);
1449                 return ret;
1450         }
1451
1452         /* Register the device with V4L. */
1453         vdev = video_device_alloc();
1454         if (vdev == NULL)
1455                 return -1;
1456
1457         /* We already hold a reference to dev->udev. The video device will be
1458          * unregistered before the reference is released, so we don't need to
1459          * get another one.
1460          */
1461         vdev->parent = &dev->intf->dev;
1462         vdev->minor = -1;
1463         vdev->fops = &uvc_fops;
1464         vdev->release = video_device_release;
1465         strncpy(vdev->name, dev->name, sizeof vdev->name);
1466
1467         /* Set the driver data before calling video_register_device, otherwise
1468          * uvc_v4l2_open might race us.
1469          *
1470          * FIXME: usb_set_intfdata hasn't been called so far. Is that a
1471          *        problem ? Does any function which could be called here get
1472          *        a pointer to the usb_interface ?
1473          */
1474         dev->video.vdev = vdev;
1475         video_set_drvdata(vdev, &dev->video);
1476
1477         if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
1478                 dev->video.vdev = NULL;
1479                 video_device_release(vdev);
1480                 return -1;
1481         }
1482
1483         return 0;
1484 }
1485
1486 /*
1487  * Delete the UVC device.
1488  *
1489  * Called by the kernel when the last reference to the uvc_device structure
1490  * is released.
1491  *
1492  * Unregistering the video devices is done here because every opened instance
1493  * must be closed before the device can be unregistered. An alternative would
1494  * have been to use another reference count for uvc_v4l2_open/uvc_release, and
1495  * unregister the video devices on disconnect when that reference count drops
1496  * to zero.
1497  *
1498  * As this function is called after or during disconnect(), all URBs have
1499  * already been canceled by the USB core. There is no need to kill the
1500  * interrupt URB manually.
1501  */
1502 void uvc_delete(struct kref *kref)
1503 {
1504         struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
1505         struct list_head *p, *n;
1506
1507         /* Unregister the video device */
1508         uvc_unregister_video(dev);
1509         usb_put_intf(dev->intf);
1510         usb_put_dev(dev->udev);
1511
1512         uvc_status_cleanup(dev);
1513         uvc_ctrl_cleanup_device(dev);
1514
1515         list_for_each_safe(p, n, &dev->entities) {
1516                 struct uvc_entity *entity;
1517                 entity = list_entry(p, struct uvc_entity, list);
1518                 kfree(entity);
1519         }
1520
1521         list_for_each_safe(p, n, &dev->streaming) {
1522                 struct uvc_streaming *streaming;
1523                 streaming = list_entry(p, struct uvc_streaming, list);
1524                 usb_driver_release_interface(&uvc_driver.driver,
1525                         streaming->intf);
1526                 usb_put_intf(streaming->intf);
1527                 kfree(streaming->format);
1528                 kfree(streaming->header.bmaControls);
1529                 kfree(streaming);
1530         }
1531
1532         kfree(dev);
1533 }
1534
1535 static int uvc_probe(struct usb_interface *intf,
1536                      const struct usb_device_id *id)
1537 {
1538         struct usb_device *udev = interface_to_usbdev(intf);
1539         struct uvc_device *dev;
1540         int ret;
1541
1542         if (id->idVendor && id->idProduct)
1543                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1544                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1545                                 id->idProduct);
1546         else
1547                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1548                                 udev->devpath);
1549
1550         /* Allocate memory for the device and initialize it */
1551         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1552                 return -ENOMEM;
1553
1554         INIT_LIST_HEAD(&dev->entities);
1555         INIT_LIST_HEAD(&dev->streaming);
1556         kref_init(&dev->kref);
1557
1558         dev->udev = usb_get_dev(udev);
1559         dev->intf = usb_get_intf(intf);
1560         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1561         dev->quirks = id->driver_info | uvc_quirks_param;
1562
1563         if (udev->product != NULL)
1564                 strncpy(dev->name, udev->product, sizeof dev->name);
1565         else
1566                 snprintf(dev->name, sizeof dev->name,
1567                         "UVC Camera (%04x:%04x)",
1568                         le16_to_cpu(udev->descriptor.idVendor),
1569                         le16_to_cpu(udev->descriptor.idProduct));
1570
1571         /* Parse the Video Class control descriptor */
1572         if (uvc_parse_control(dev) < 0) {
1573                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1574                         "descriptors.\n");
1575                 goto error;
1576         }
1577
1578         uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
1579                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1580                 udev->product ? udev->product : "<unnamed>",
1581                 le16_to_cpu(udev->descriptor.idVendor),
1582                 le16_to_cpu(udev->descriptor.idProduct));
1583
1584         if (uvc_quirks_param != 0) {
1585                 uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
1586                         "parameter for testing purpose.\n", uvc_quirks_param);
1587                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1588                         "linux-uvc-devel mailing list.\n");
1589         }
1590
1591         /* Initialize controls */
1592         if (uvc_ctrl_init_device(dev) < 0)
1593                 goto error;
1594
1595         /* Register the video devices */
1596         if (uvc_register_video(dev) < 0)
1597                 goto error;
1598
1599         /* Save our data pointer in the interface data */
1600         usb_set_intfdata(intf, dev);
1601
1602         /* Initialize the interrupt URB */
1603         if ((ret = uvc_status_init(dev)) < 0) {
1604                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1605                         "endpoint (%d), status interrupt will not be "
1606                         "supported.\n", ret);
1607         }
1608
1609         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1610         return 0;
1611
1612 error:
1613         kref_put(&dev->kref, uvc_delete);
1614         return -ENODEV;
1615 }
1616
1617 static void uvc_disconnect(struct usb_interface *intf)
1618 {
1619         struct uvc_device *dev = usb_get_intfdata(intf);
1620
1621         /* Set the USB interface data to NULL. This can be done outside the
1622          * lock, as there's no other reader.
1623          */
1624         usb_set_intfdata(intf, NULL);
1625
1626         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
1627                 return;
1628
1629         /* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
1630          * lock is needed to prevent uvc_disconnect from releasing its
1631          * reference to the uvc_device instance after uvc_v4l2_open() received
1632          * the pointer to the device (video_devdata) but before it got the
1633          * chance to increase the reference count (kref_get).
1634          *
1635          * Note that the reference can't be released with the lock held,
1636          * otherwise a AB-BA deadlock can occur with videodev_lock that
1637          * videodev acquires in videodev_open() and video_unregister_device().
1638          */
1639         mutex_lock(&uvc_driver.open_mutex);
1640         dev->state |= UVC_DEV_DISCONNECTED;
1641         mutex_unlock(&uvc_driver.open_mutex);
1642
1643         kref_put(&dev->kref, uvc_delete);
1644 }
1645
1646 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1647 {
1648         struct uvc_device *dev = usb_get_intfdata(intf);
1649
1650         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
1651                 intf->cur_altsetting->desc.bInterfaceNumber);
1652
1653         /* Controls are cached on the fly so they don't need to be saved. */
1654         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
1655                 return uvc_status_suspend(dev);
1656
1657         if (dev->video.streaming->intf != intf) {
1658                 uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
1659                                 "interface mismatch.\n");
1660                 return -EINVAL;
1661         }
1662
1663         return uvc_video_suspend(&dev->video);
1664 }
1665
1666 static int __uvc_resume(struct usb_interface *intf, int reset)
1667 {
1668         struct uvc_device *dev = usb_get_intfdata(intf);
1669         int ret;
1670
1671         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
1672                 intf->cur_altsetting->desc.bInterfaceNumber);
1673
1674         if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
1675                 if (reset && (ret = uvc_ctrl_resume_device(dev)) < 0)
1676                         return ret;
1677
1678                 return uvc_status_resume(dev);
1679         }
1680
1681         if (dev->video.streaming->intf != intf) {
1682                 uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
1683                                 "interface mismatch.\n");
1684                 return -EINVAL;
1685         }
1686
1687         return uvc_video_resume(&dev->video);
1688 }
1689
1690 static int uvc_resume(struct usb_interface *intf)
1691 {
1692         return __uvc_resume(intf, 0);
1693 }
1694
1695 static int uvc_reset_resume(struct usb_interface *intf)
1696 {
1697         return __uvc_resume(intf, 1);
1698 }
1699
1700 /* ------------------------------------------------------------------------
1701  * Driver initialization and cleanup
1702  */
1703
1704 /*
1705  * The Logitech cameras listed below have their interface class set to
1706  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
1707  * though they are compliant.
1708  */
1709 static struct usb_device_id uvc_ids[] = {
1710         /* ALi M5606 (Clevo M540SR) */
1711         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1712                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1713           .idVendor             = 0x0402,
1714           .idProduct            = 0x5606,
1715           .bInterfaceClass      = USB_CLASS_VIDEO,
1716           .bInterfaceSubClass   = 1,
1717           .bInterfaceProtocol   = 0,
1718           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1719         /* Creative Live! Optia */
1720         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1721                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1722           .idVendor             = 0x041e,
1723           .idProduct            = 0x4057,
1724           .bInterfaceClass      = USB_CLASS_VIDEO,
1725           .bInterfaceSubClass   = 1,
1726           .bInterfaceProtocol   = 0,
1727           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1728         /* Microsoft Lifecam NX-6000 */
1729         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1730                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1731           .idVendor             = 0x045e,
1732           .idProduct            = 0x00f8,
1733           .bInterfaceClass      = USB_CLASS_VIDEO,
1734           .bInterfaceSubClass   = 1,
1735           .bInterfaceProtocol   = 0,
1736           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1737         /* Microsoft Lifecam VX-7000 */
1738         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1739                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1740           .idVendor             = 0x045e,
1741           .idProduct            = 0x0723,
1742           .bInterfaceClass      = USB_CLASS_VIDEO,
1743           .bInterfaceSubClass   = 1,
1744           .bInterfaceProtocol   = 0,
1745           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1746         /* Logitech Quickcam Fusion */
1747         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1748                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1749           .idVendor             = 0x046d,
1750           .idProduct            = 0x08c1,
1751           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1752           .bInterfaceSubClass   = 1,
1753           .bInterfaceProtocol   = 0 },
1754         /* Logitech Quickcam Orbit MP */
1755         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1756                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1757           .idVendor             = 0x046d,
1758           .idProduct            = 0x08c2,
1759           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1760           .bInterfaceSubClass   = 1,
1761           .bInterfaceProtocol   = 0 },
1762         /* Logitech Quickcam Pro for Notebook */
1763         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1764                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1765           .idVendor             = 0x046d,
1766           .idProduct            = 0x08c3,
1767           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1768           .bInterfaceSubClass   = 1,
1769           .bInterfaceProtocol   = 0 },
1770         /* Logitech Quickcam Pro 5000 */
1771         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1772                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1773           .idVendor             = 0x046d,
1774           .idProduct            = 0x08c5,
1775           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1776           .bInterfaceSubClass   = 1,
1777           .bInterfaceProtocol   = 0 },
1778         /* Logitech Quickcam OEM Dell Notebook */
1779         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1780                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1781           .idVendor             = 0x046d,
1782           .idProduct            = 0x08c6,
1783           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1784           .bInterfaceSubClass   = 1,
1785           .bInterfaceProtocol   = 0 },
1786         /* Logitech Quickcam OEM Cisco VT Camera II */
1787         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1788                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1789           .idVendor             = 0x046d,
1790           .idProduct            = 0x08c7,
1791           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1792           .bInterfaceSubClass   = 1,
1793           .bInterfaceProtocol   = 0 },
1794         /* Apple Built-In iSight */
1795         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1796                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1797           .idVendor             = 0x05ac,
1798           .idProduct            = 0x8501,
1799           .bInterfaceClass      = USB_CLASS_VIDEO,
1800           .bInterfaceSubClass   = 1,
1801           .bInterfaceProtocol   = 0,
1802           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1803                                 | UVC_QUIRK_BUILTIN_ISIGHT },
1804         /* Genesys Logic USB 2.0 PC Camera */
1805         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1806                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1807           .idVendor             = 0x05e3,
1808           .idProduct            = 0x0505,
1809           .bInterfaceClass      = USB_CLASS_VIDEO,
1810           .bInterfaceSubClass   = 1,
1811           .bInterfaceProtocol   = 0,
1812           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1813         /* Silicon Motion SM371 */
1814         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1815                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1816           .idVendor             = 0x090c,
1817           .idProduct            = 0xb371,
1818           .bInterfaceClass      = USB_CLASS_VIDEO,
1819           .bInterfaceSubClass   = 1,
1820           .bInterfaceProtocol   = 0,
1821           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1822         /* MT6227 */
1823         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1824                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1825           .idVendor             = 0x0e8d,
1826           .idProduct            = 0x0004,
1827           .bInterfaceClass      = USB_CLASS_VIDEO,
1828           .bInterfaceSubClass   = 1,
1829           .bInterfaceProtocol   = 0,
1830           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1831         /* Syntek (HP Spartan) */
1832         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1833                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1834           .idVendor             = 0x174f,
1835           .idProduct            = 0x5212,
1836           .bInterfaceClass      = USB_CLASS_VIDEO,
1837           .bInterfaceSubClass   = 1,
1838           .bInterfaceProtocol   = 0,
1839           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1840         /* Asus F9SG */
1841         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1842                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1843           .idVendor             = 0x174f,
1844           .idProduct            = 0x8a31,
1845           .bInterfaceClass      = USB_CLASS_VIDEO,
1846           .bInterfaceSubClass   = 1,
1847           .bInterfaceProtocol   = 0,
1848           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1849         /* Syntek (Asus U3S) */
1850         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1851                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1852           .idVendor             = 0x174f,
1853           .idProduct            = 0x8a33,
1854           .bInterfaceClass      = USB_CLASS_VIDEO,
1855           .bInterfaceSubClass   = 1,
1856           .bInterfaceProtocol   = 0,
1857           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
1858         /* Ecamm Pico iMage */
1859         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1860                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1861           .idVendor             = 0x18cd,
1862           .idProduct            = 0xcafe,
1863           .bInterfaceClass      = USB_CLASS_VIDEO,
1864           .bInterfaceSubClass   = 1,
1865           .bInterfaceProtocol   = 0,
1866           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
1867         /* Bodelin ProScopeHR */
1868         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1869                                 | USB_DEVICE_ID_MATCH_DEV_HI
1870                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1871           .idVendor             = 0x19ab,
1872           .idProduct            = 0x1000,
1873           .bcdDevice_hi         = 0x0126,
1874           .bInterfaceClass      = USB_CLASS_VIDEO,
1875           .bInterfaceSubClass   = 1,
1876           .bInterfaceProtocol   = 0,
1877           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
1878         /* SiGma Micro USB Web Camera */
1879         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1880                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1881           .idVendor             = 0x1c4f,
1882           .idProduct            = 0x3000,
1883           .bInterfaceClass      = USB_CLASS_VIDEO,
1884           .bInterfaceSubClass   = 1,
1885           .bInterfaceProtocol   = 0,
1886           .driver_info          = UVC_QUIRK_PROBE_MINMAX
1887                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT},
1888         /* Acer OEM Webcam - Unknown vendor */
1889         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1890                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1891           .idVendor             = 0x5986,
1892           .idProduct            = 0x0100,
1893           .bInterfaceClass      = USB_CLASS_VIDEO,
1894           .bInterfaceSubClass   = 1,
1895           .bInterfaceProtocol   = 0,
1896           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1897         /* Packard Bell OEM Webcam - Bison Electronics */
1898         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1899                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1900           .idVendor             = 0x5986,
1901           .idProduct            = 0x0101,
1902           .bInterfaceClass      = USB_CLASS_VIDEO,
1903           .bInterfaceSubClass   = 1,
1904           .bInterfaceProtocol   = 0,
1905           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1906         /* Acer Crystal Eye webcam - Bison Electronics */
1907         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1908                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1909           .idVendor             = 0x5986,
1910           .idProduct            = 0x0102,
1911           .bInterfaceClass      = USB_CLASS_VIDEO,
1912           .bInterfaceSubClass   = 1,
1913           .bInterfaceProtocol   = 0,
1914           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1915         /* Compaq Presario B1200 - Bison Electronics */
1916         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1917                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1918           .idVendor             = 0x5986,
1919           .idProduct            = 0x0104,
1920           .bInterfaceClass      = USB_CLASS_VIDEO,
1921           .bInterfaceSubClass   = 1,
1922           .bInterfaceProtocol   = 0,
1923           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1924         /* Acer Travelmate 7720 - Bison Electronics */
1925         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1926                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1927           .idVendor             = 0x5986,
1928           .idProduct            = 0x0105,
1929           .bInterfaceClass      = USB_CLASS_VIDEO,
1930           .bInterfaceSubClass   = 1,
1931           .bInterfaceProtocol   = 0,
1932           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1933         /* Medion Akoya Mini E1210 - Bison Electronics */
1934         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1935                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1936           .idVendor             = 0x5986,
1937           .idProduct            = 0x0141,
1938           .bInterfaceClass      = USB_CLASS_VIDEO,
1939           .bInterfaceSubClass   = 1,
1940           .bInterfaceProtocol   = 0,
1941           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1942         /* Acer OrbiCam - Bison Electronics */
1943         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1944                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1945           .idVendor             = 0x5986,
1946           .idProduct            = 0x0200,
1947           .bInterfaceClass      = USB_CLASS_VIDEO,
1948           .bInterfaceSubClass   = 1,
1949           .bInterfaceProtocol   = 0,
1950           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1951         /*  Fujitsu Amilo SI2636 - Bison Electronics */
1952         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1953                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1954           .idVendor             = 0x5986,
1955           .idProduct            = 0x0202,
1956           .bInterfaceClass      = USB_CLASS_VIDEO,
1957           .bInterfaceSubClass   = 1,
1958           .bInterfaceProtocol   = 0,
1959           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1960         /*  Advent 4211 - Bison Electronics */
1961         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1962                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1963           .idVendor             = 0x5986,
1964           .idProduct            = 0x0203,
1965           .bInterfaceClass      = USB_CLASS_VIDEO,
1966           .bInterfaceSubClass   = 1,
1967           .bInterfaceProtocol   = 0,
1968           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1969         /* Bison Electronics */
1970         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1971                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1972           .idVendor             = 0x5986,
1973           .idProduct            = 0x0300,
1974           .bInterfaceClass      = USB_CLASS_VIDEO,
1975           .bInterfaceSubClass   = 1,
1976           .bInterfaceProtocol   = 0,
1977           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1978         /* Clevo M570TU - Bison Electronics */
1979         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1980                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1981           .idVendor             = 0x5986,
1982           .idProduct            = 0x0303,
1983           .bInterfaceClass      = USB_CLASS_VIDEO,
1984           .bInterfaceSubClass   = 1,
1985           .bInterfaceProtocol   = 0,
1986           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
1987         /* Generic USB Video Class */
1988         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
1989         {}
1990 };
1991
1992 MODULE_DEVICE_TABLE(usb, uvc_ids);
1993
1994 struct uvc_driver uvc_driver = {
1995         .driver = {
1996                 .name           = "uvcvideo",
1997                 .probe          = uvc_probe,
1998                 .disconnect     = uvc_disconnect,
1999                 .suspend        = uvc_suspend,
2000                 .resume         = uvc_resume,
2001                 .reset_resume   = uvc_reset_resume,
2002                 .id_table       = uvc_ids,
2003                 .supports_autosuspend = 1,
2004         },
2005 };
2006
2007 static int __init uvc_init(void)
2008 {
2009         int result;
2010
2011         INIT_LIST_HEAD(&uvc_driver.devices);
2012         INIT_LIST_HEAD(&uvc_driver.controls);
2013         mutex_init(&uvc_driver.open_mutex);
2014         mutex_init(&uvc_driver.ctrl_mutex);
2015
2016         uvc_ctrl_init();
2017
2018         result = usb_register(&uvc_driver.driver);
2019         if (result == 0)
2020                 printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2021         return result;
2022 }
2023
2024 static void __exit uvc_cleanup(void)
2025 {
2026         usb_deregister(&uvc_driver.driver);
2027 }
2028
2029 module_init(uvc_init);
2030 module_exit(uvc_cleanup);
2031
2032 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2033 MODULE_PARM_DESC(quirks, "Forced device quirks");
2034 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2035 MODULE_PARM_DESC(trace, "Trace level bitmask");
2036
2037 MODULE_AUTHOR(DRIVER_AUTHOR);
2038 MODULE_DESCRIPTION(DRIVER_DESC);
2039 MODULE_LICENSE("GPL");
2040 MODULE_VERSION(DRIVER_VERSION);
2041