kernel/drivers/media/usb/uvc/uvc_driver.c

   1 /*
   2  *      uvc_driver.c  --  USB Video Class driver
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/atomic.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/wait.h>
  23 #include <linux/version.h>
  24 #include <asm/unaligned.h>
  25
  26 #include <media/v4l2-common.h>
  27
  28 #include "uvcvideo.h"
  29
  30 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  31                                 "<laurent.pinchart@ideasonboard.com>"
  32 #define DRIVER_DESC             "USB Video Class driver"
  33
  34 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  35 unsigned int uvc_hw_timestamps_param;
  36 unsigned int uvc_no_drop_param;
  37 static unsigned int uvc_quirks_param = -1;
  38 unsigned int uvc_trace_param;
  39 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  40
  41 /* ------------------------------------------------------------------------
  42  * Video formats
  43  */
  44
  45 static struct uvc_format_desc uvc_fmts[] = {
  46         {
  47                 .name           = "YUV 4:2:2 (YUYV)",
  48                 .guid           = UVC_GUID_FORMAT_YUY2,
  49                 .fcc            = V4L2_PIX_FMT_YUYV,
  50         },
  51         {
  52                 .name           = "YUV 4:2:2 (YUYV)",
  53                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  54                 .fcc            = V4L2_PIX_FMT_YUYV,
  55         },
  56         {
  57                 .name           = "YUV 4:2:0 (NV12)",
  58                 .guid           = UVC_GUID_FORMAT_NV12,
  59                 .fcc            = V4L2_PIX_FMT_NV12,
  60         },
  61         {
  62                 .name           = "MJPEG",
  63                 .guid           = UVC_GUID_FORMAT_MJPEG,
  64                 .fcc            = V4L2_PIX_FMT_MJPEG,
  65         },
  66         {
  67                 .name           = "YVU 4:2:0 (YV12)",
  68                 .guid           = UVC_GUID_FORMAT_YV12,
  69                 .fcc            = V4L2_PIX_FMT_YVU420,
  70         },
  71         {
  72                 .name           = "YUV 4:2:0 (I420)",
  73                 .guid           = UVC_GUID_FORMAT_I420,
  74                 .fcc            = V4L2_PIX_FMT_YUV420,
  75         },
  76         {
  77                 .name           = "YUV 4:2:0 (M420)",
  78                 .guid           = UVC_GUID_FORMAT_M420,
  79                 .fcc            = V4L2_PIX_FMT_M420,
  80         },
  81         {
  82                 .name           = "YUV 4:2:2 (UYVY)",
  83                 .guid           = UVC_GUID_FORMAT_UYVY,
  84                 .fcc            = V4L2_PIX_FMT_UYVY,
  85         },
  86         {
  87                 .name           = "Greyscale 8-bit (Y800)",
  88                 .guid           = UVC_GUID_FORMAT_Y800,
  89                 .fcc            = V4L2_PIX_FMT_GREY,
  90         },
  91         {
  92                 .name           = "Greyscale 8-bit (Y8  )",
  93                 .guid           = UVC_GUID_FORMAT_Y8,
  94                 .fcc            = V4L2_PIX_FMT_GREY,
  95         },
  96         {
  97                 .name           = "Greyscale 10-bit (Y10 )",
  98                 .guid           = UVC_GUID_FORMAT_Y10,
  99                 .fcc            = V4L2_PIX_FMT_Y10,
 100         },
 101         {
 102                 .name           = "Greyscale 12-bit (Y12 )",
 103                 .guid           = UVC_GUID_FORMAT_Y12,
 104                 .fcc            = V4L2_PIX_FMT_Y12,
 105         },
 106         {
 107                 .name           = "Greyscale 16-bit (Y16 )",
 108                 .guid           = UVC_GUID_FORMAT_Y16,
 109                 .fcc            = V4L2_PIX_FMT_Y16,
 110         },
 111         {
 112                 .name           = "BGGR Bayer (BY8 )",
 113                 .guid           = UVC_GUID_FORMAT_BY8,
 114                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 115         },
 116         {
 117                 .name           = "BGGR Bayer (BA81)",
 118                 .guid           = UVC_GUID_FORMAT_BA81,
 119                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 120         },
 121         {
 122                 .name           = "GBRG Bayer (GBRG)",
 123                 .guid           = UVC_GUID_FORMAT_GBRG,
 124                 .fcc            = V4L2_PIX_FMT_SGBRG8,
 125         },
 126         {
 127                 .name           = "GRBG Bayer (GRBG)",
 128                 .guid           = UVC_GUID_FORMAT_GRBG,
 129                 .fcc            = V4L2_PIX_FMT_SGRBG8,
 130         },
 131         {
 132                 .name           = "RGGB Bayer (RGGB)",
 133                 .guid           = UVC_GUID_FORMAT_RGGB,
 134                 .fcc            = V4L2_PIX_FMT_SRGGB8,
 135         },
 136         {
 137                 .name           = "RGB565",
 138                 .guid           = UVC_GUID_FORMAT_RGBP,
 139                 .fcc            = V4L2_PIX_FMT_RGB565,
 140         },
 141         {
 142                 .name           = "BGR 8:8:8 (BGR3)",
 143                 .guid           = UVC_GUID_FORMAT_BGR3,
 144                 .fcc            = V4L2_PIX_FMT_BGR24,
 145         },
 146         {
 147                 .name           = "H.264",
 148                 .guid           = UVC_GUID_FORMAT_H264,
 149                 .fcc            = V4L2_PIX_FMT_H264,
 150         },
 151         {
 152                 .name           = "Greyscale 8 L/R (Y8I)",
 153                 .guid           = UVC_GUID_FORMAT_Y8I,
 154                 .fcc            = V4L2_PIX_FMT_Y8I,
 155         },
 156         {
 157                 .name           = "Greyscale 12 L/R (Y12I)",
 158                 .guid           = UVC_GUID_FORMAT_Y12I,
 159                 .fcc            = V4L2_PIX_FMT_Y12I,
 160         },
 161         {
 162                 .name           = "Depth data 16-bit (Z16)",
 163                 .guid           = UVC_GUID_FORMAT_Z16,
 164                 .fcc            = V4L2_PIX_FMT_Z16,
 165         },
 166         {
 167                 .name           = "Bayer 10-bit (SRGGB10P)",
 168                 .guid           = UVC_GUID_FORMAT_RW10,
 169                 .fcc            = V4L2_PIX_FMT_SRGGB10P,
 170         },
 171 };
 172
 173 /* ------------------------------------------------------------------------
 174  * Utility functions
 175  */
 176
 177 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 178                 __u8 epaddr)
 179 {
 180         struct usb_host_endpoint *ep;
 181         unsigned int i;
 182
 183         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 184                 ep = &alts->endpoint[i];
 185                 if (ep->desc.bEndpointAddress == epaddr)
 186                         return ep;
 187         }
 188
 189         return NULL;
 190 }
 191
 192 static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
 193 {
 194         unsigned int len = ARRAY_SIZE(uvc_fmts);
 195         unsigned int i;
 196
 197         for (i = 0; i < len; ++i) {
 198                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 199                         return &uvc_fmts[i];
 200         }
 201
 202         return NULL;
 203 }
 204
 205 static __u32 uvc_colorspace(const __u8 primaries)
 206 {
 207         static const __u8 colorprimaries[] = {
 208                 0,
 209                 V4L2_COLORSPACE_SRGB,
 210                 V4L2_COLORSPACE_470_SYSTEM_M,
 211                 V4L2_COLORSPACE_470_SYSTEM_BG,
 212                 V4L2_COLORSPACE_SMPTE170M,
 213                 V4L2_COLORSPACE_SMPTE240M,
 214         };
 215
 216         if (primaries < ARRAY_SIZE(colorprimaries))
 217                 return colorprimaries[primaries];
 218
 219         return 0;
 220 }
 221
 222 /* Simplify a fraction using a simple continued fraction decomposition. The
 223  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 224  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 225  * arbitrary parameters to remove non-significative terms from the simple
 226  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 227  * respectively seems to give nice results.
 228  */
 229 void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 230                 unsigned int n_terms, unsigned int threshold)
 231 {
 232         uint32_t *an;
 233         uint32_t x, y, r;
 234         unsigned int i, n;
 235
 236         an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
 237         if (an == NULL)
 238                 return;
 239
 240         /* Convert the fraction to a simple continued fraction. See
 241          * http://mathforum.org/dr.math/faq/faq.fractions.html
 242          * Stop if the current term is bigger than or equal to the given
 243          * threshold.
 244          */
 245         x = *numerator;
 246         y = *denominator;
 247
 248         for (n = 0; n < n_terms && y != 0; ++n) {
 249                 an[n] = x / y;
 250                 if (an[n] >= threshold) {
 251                         if (n < 2)
 252                                 n++;
 253                         break;
 254                 }
 255
 256                 r = x - an[n] * y;
 257                 x = y;
 258                 y = r;
 259         }
 260
 261         /* Expand the simple continued fraction back to an integer fraction. */
 262         x = 0;
 263         y = 1;
 264
 265         for (i = n; i > 0; --i) {
 266                 r = y;
 267                 y = an[i-1] * y + x;
 268                 x = r;
 269         }
 270
 271         *numerator = y;
 272         *denominator = x;
 273         kfree(an);
 274 }
 275
 276 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 277  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 278  * arithmetic only.
 279  */
 280 uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
 281 {
 282         uint32_t multiplier;
 283
 284         /* Saturate the result if the operation would overflow. */
 285         if (denominator == 0 ||
 286             numerator/denominator >= ((uint32_t)-1)/10000000)
 287                 return (uint32_t)-1;
 288
 289         /* Divide both the denominator and the multiplier by two until
 290          * numerator * multiplier doesn't overflow. If anyone knows a better
 291          * algorithm please let me know.
 292          */
 293         multiplier = 10000000;
 294         while (numerator > ((uint32_t)-1)/multiplier) {
 295                 multiplier /= 2;
 296                 denominator /= 2;
 297         }
 298
 299         return denominator ? numerator * multiplier / denominator : 0;
 300 }
 301
 302 /* ------------------------------------------------------------------------
 303  * Terminal and unit management
 304  */
 305
 306 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 307 {
 308         struct uvc_entity *entity;
 309
 310         list_for_each_entry(entity, &dev->entities, list) {
 311                 if (entity->id == id)
 312                         return entity;
 313         }
 314
 315         return NULL;
 316 }
 317
 318 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 319         int id, struct uvc_entity *entity)
 320 {
 321         unsigned int i;
 322
 323         if (entity == NULL)
 324                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 325
 326         list_for_each_entry_continue(entity, &dev->entities, list) {
 327                 for (i = 0; i < entity->bNrInPins; ++i)
 328                         if (entity->baSourceID[i] == id)
 329                                 return entity;
 330         }
 331
 332         return NULL;
 333 }
 334
 335 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 336 {
 337         struct uvc_streaming *stream;
 338
 339         list_for_each_entry(stream, &dev->streams, list) {
 340                 if (stream->header.bTerminalLink == id)
 341                         return stream;
 342         }
 343
 344         return NULL;
 345 }
 346
 347 /* ------------------------------------------------------------------------
 348  * Descriptors parsing
 349  */
 350
 351 static int uvc_parse_format(struct uvc_device *dev,
 352         struct uvc_streaming *streaming, struct uvc_format *format,
 353         __u32 **intervals, unsigned char *buffer, int buflen)
 354 {
 355         struct usb_interface *intf = streaming->intf;
 356         struct usb_host_interface *alts = intf->cur_altsetting;
 357         struct uvc_format_desc *fmtdesc;
 358         struct uvc_frame *frame;
 359         const unsigned char *start = buffer;
 360         unsigned int width_multiplier = 1;
 361         unsigned int interval;
 362         unsigned int i, n;
 363         __u8 ftype;
 364
 365         format->type = buffer[2];
 366         format->index = buffer[3];
 367
 368         switch (buffer[2]) {
 369         case UVC_VS_FORMAT_UNCOMPRESSED:
 370         case UVC_VS_FORMAT_FRAME_BASED:
 371                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 372                 if (buflen < n) {
 373                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 374                                "interface %d FORMAT error\n",
 375                                dev->udev->devnum,
 376                                alts->desc.bInterfaceNumber);
 377                         return -EINVAL;
 378                 }
 379
 380                 /* Find the format descriptor from its GUID. */
 381                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 382
 383                 if (fmtdesc != NULL) {
 384                         strlcpy(format->name, fmtdesc->name,
 385                                 sizeof format->name);
 386                         format->fcc = fmtdesc->fcc;
 387                 } else {
 388                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 389                                 &buffer[5]);
 390                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 391                                 &buffer[5]);
 392                         format->fcc = 0;
 393                 }
 394
 395                 format->bpp = buffer[21];
 396
 397                 /* Some devices report a format that doesn't match what they
 398                  * really send.
 399                  */
 400                 if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
 401                         if (format->fcc == V4L2_PIX_FMT_YUYV) {
 402                                 strlcpy(format->name, "Greyscale 8-bit (Y8  )",
 403                                         sizeof(format->name));
 404                                 format->fcc = V4L2_PIX_FMT_GREY;
 405                                 format->bpp = 8;
 406                                 width_multiplier = 2;
 407                         }
 408                 }
 409
 410                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 411                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 412                 } else {
 413                         ftype = UVC_VS_FRAME_FRAME_BASED;
 414                         if (buffer[27])
 415                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 416                 }
 417                 break;
 418
 419         case UVC_VS_FORMAT_MJPEG:
 420                 if (buflen < 11) {
 421                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 422                                "interface %d FORMAT error\n",
 423                                dev->udev->devnum,
 424                                alts->desc.bInterfaceNumber);
 425                         return -EINVAL;
 426                 }
 427
 428                 strlcpy(format->name, "MJPEG", sizeof format->name);
 429                 format->fcc = V4L2_PIX_FMT_MJPEG;
 430                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 431                 format->bpp = 0;
 432                 ftype = UVC_VS_FRAME_MJPEG;
 433                 break;
 434
 435         case UVC_VS_FORMAT_DV:
 436                 if (buflen < 9) {
 437                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 438                                "interface %d FORMAT error\n",
 439                                dev->udev->devnum,
 440                                alts->desc.bInterfaceNumber);
 441                         return -EINVAL;
 442                 }
 443
 444                 switch (buffer[8] & 0x7f) {
 445                 case 0:
 446                         strlcpy(format->name, "SD-DV", sizeof format->name);
 447                         break;
 448                 case 1:
 449                         strlcpy(format->name, "SDL-DV", sizeof format->name);
 450                         break;
 451                 case 2:
 452                         strlcpy(format->name, "HD-DV", sizeof format->name);
 453                         break;
 454                 default:
 455                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 456                                "interface %d: unknown DV format %u\n",
 457                                dev->udev->devnum,
 458                                alts->desc.bInterfaceNumber, buffer[8]);
 459                         return -EINVAL;
 460                 }
 461
 462                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 463                         sizeof format->name);
 464
 465                 format->fcc = V4L2_PIX_FMT_DV;
 466                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 467                 format->bpp = 0;
 468                 ftype = 0;
 469
 470                 /* Create a dummy frame descriptor. */
 471                 frame = &format->frame[0];
 472                 memset(&format->frame[0], 0, sizeof format->frame[0]);
 473                 frame->bFrameIntervalType = 1;
 474                 frame->dwDefaultFrameInterval = 1;
 475                 frame->dwFrameInterval = *intervals;
 476                 *(*intervals)++ = 1;
 477                 format->nframes = 1;
 478                 break;
 479
 480         case UVC_VS_FORMAT_MPEG2TS:
 481         case UVC_VS_FORMAT_STREAM_BASED:
 482                 /* Not supported yet. */
 483         default:
 484                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 485                        "interface %d unsupported format %u\n",
 486                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 487                        buffer[2]);
 488                 return -EINVAL;
 489         }
 490
 491         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 492
 493         buflen -= buffer[0];
 494         buffer += buffer[0];
 495
 496         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 497          * based formats have frame descriptors.
 498          */
 499         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 500                buffer[2] == ftype) {
 501                 frame = &format->frame[format->nframes];
 502                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 503                         n = buflen > 25 ? buffer[25] : 0;
 504                 else
 505                         n = buflen > 21 ? buffer[21] : 0;
 506
 507                 n = n ? n : 3;
 508
 509                 if (buflen < 26 + 4*n) {
 510                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 511                                "interface %d FRAME error\n", dev->udev->devnum,
 512                                alts->desc.bInterfaceNumber);
 513                         return -EINVAL;
 514                 }
 515
 516                 frame->bFrameIndex = buffer[3];
 517                 frame->bmCapabilities = buffer[4];
 518                 frame->wWidth = get_unaligned_le16(&buffer[5])
 519                               * width_multiplier;
 520                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 521                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 522                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 523                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 524                         frame->dwMaxVideoFrameBufferSize =
 525                                 get_unaligned_le32(&buffer[17]);
 526                         frame->dwDefaultFrameInterval =
 527                                 get_unaligned_le32(&buffer[21]);
 528                         frame->bFrameIntervalType = buffer[25];
 529                 } else {
 530                         frame->dwMaxVideoFrameBufferSize = 0;
 531                         frame->dwDefaultFrameInterval =
 532                                 get_unaligned_le32(&buffer[17]);
 533                         frame->bFrameIntervalType = buffer[21];
 534                 }
 535                 frame->dwFrameInterval = *intervals;
 536
 537                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 538                  * completely. Observed behaviours range from setting the
 539                  * value to 1.1x the actual frame size to hardwiring the
 540                  * 16 low bits to 0. This results in a higher than necessary
 541                  * memory usage as well as a wrong image size information. For
 542                  * uncompressed formats this can be fixed by computing the
 543                  * value from the frame size.
 544                  */
 545                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 546                         frame->dwMaxVideoFrameBufferSize = format->bpp
 547                                 * frame->wWidth * frame->wHeight / 8;
 548
 549                 /* Some bogus devices report dwMinFrameInterval equal to
 550                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 551                  * zero. Setting all null intervals to 1 fixes the problem and
 552                  * some other divisions by zero that could happen.
 553                  */
 554                 for (i = 0; i < n; ++i) {
 555                         interval = get_unaligned_le32(&buffer[26+4*i]);
 556                         *(*intervals)++ = interval ? interval : 1;
 557                 }
 558
 559                 /* Make sure that the default frame interval stays between
 560                  * the boundaries.
 561                  */
 562                 n -= frame->bFrameIntervalType ? 1 : 2;
 563                 frame->dwDefaultFrameInterval =
 564                         min(frame->dwFrameInterval[n],
 565                             max(frame->dwFrameInterval[0],
 566                                 frame->dwDefaultFrameInterval));
 567
 568                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 569                         frame->bFrameIntervalType = 1;
 570                         frame->dwFrameInterval[0] =
 571                                 frame->dwDefaultFrameInterval;
 572                 }
 573
 574                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 575                         frame->wWidth, frame->wHeight,
 576                         10000000/frame->dwDefaultFrameInterval,
 577                         (100000000/frame->dwDefaultFrameInterval)%10);
 578
 579                 format->nframes++;
 580                 buflen -= buffer[0];
 581                 buffer += buffer[0];
 582         }
 583
 584         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 585             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 586                 buflen -= buffer[0];
 587                 buffer += buffer[0];
 588         }
 589
 590         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 591             buffer[2] == UVC_VS_COLORFORMAT) {
 592                 if (buflen < 6) {
 593                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 594                                "interface %d COLORFORMAT error\n",
 595                                dev->udev->devnum,
 596                                alts->desc.bInterfaceNumber);
 597                         return -EINVAL;
 598                 }
 599
 600                 format->colorspace = uvc_colorspace(buffer[3]);
 601
 602                 buflen -= buffer[0];
 603                 buffer += buffer[0];
 604         }
 605
 606         return buffer - start;
 607 }
 608
 609 static int uvc_parse_streaming(struct uvc_device *dev,
 610         struct usb_interface *intf)
 611 {
 612         struct uvc_streaming *streaming = NULL;
 613         struct uvc_format *format;
 614         struct uvc_frame *frame;
 615         struct usb_host_interface *alts = &intf->altsetting[0];
 616         unsigned char *_buffer, *buffer = alts->extra;
 617         int _buflen, buflen = alts->extralen;
 618         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 619         unsigned int size, i, n, p;
 620         __u32 *interval;
 621         __u16 psize;
 622         int ret = -EINVAL;
 623
 624         if (intf->cur_altsetting->desc.bInterfaceSubClass
 625                 != UVC_SC_VIDEOSTREAMING) {
 626                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 627                         "video streaming interface\n", dev->udev->devnum,
 628                         intf->altsetting[0].desc.bInterfaceNumber);
 629                 return -EINVAL;
 630         }
 631
 632         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 633                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 634                         "claimed\n", dev->udev->devnum,
 635                         intf->altsetting[0].desc.bInterfaceNumber);
 636                 return -EINVAL;
 637         }
 638
 639         streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
 640         if (streaming == NULL) {
 641                 usb_driver_release_interface(&uvc_driver.driver, intf);
 642                 return -EINVAL;
 643         }
 644
 645         mutex_init(&streaming->mutex);
 646         streaming->dev = dev;
 647         streaming->intf = usb_get_intf(intf);
 648         streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 649
 650         /* The Pico iMage webcam has its class-specific interface descriptors
 651          * after the endpoint descriptors.
 652          */
 653         if (buflen == 0) {
 654                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 655                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 656
 657                         if (ep->extralen == 0)
 658                                 continue;
 659
 660                         if (ep->extralen > 2 &&
 661                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 662                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 663                                         "from endpoint %u.\n", i);
 664                                 buffer = alts->endpoint[i].extra;
 665                                 buflen = alts->endpoint[i].extralen;
 666                                 break;
 667                         }
 668                 }
 669         }
 670
 671         /* Skip the standard interface descriptors. */
 672         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 673                 buflen -= buffer[0];
 674                 buffer += buffer[0];
 675         }
 676
 677         if (buflen <= 2) {
 678                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 679                         "interface descriptors found.\n");
 680                 goto error;
 681         }
 682
 683         /* Parse the header descriptor. */
 684         switch (buffer[2]) {
 685         case UVC_VS_OUTPUT_HEADER:
 686                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 687                 size = 9;
 688                 break;
 689
 690         case UVC_VS_INPUT_HEADER:
 691                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 692                 size = 13;
 693                 break;
 694
 695         default:
 696                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 697                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 698                         alts->desc.bInterfaceNumber);
 699                 goto error;
 700         }
 701
 702         p = buflen >= 4 ? buffer[3] : 0;
 703         n = buflen >= size ? buffer[size-1] : 0;
 704
 705         if (buflen < size + p*n) {
 706                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 707                         "interface %d HEADER descriptor is invalid.\n",
 708                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 709                 goto error;
 710         }
 711
 712         streaming->header.bNumFormats = p;
 713         streaming->header.bEndpointAddress = buffer[6];
 714         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 715                 streaming->header.bmInfo = buffer[7];
 716                 streaming->header.bTerminalLink = buffer[8];
 717                 streaming->header.bStillCaptureMethod = buffer[9];
 718                 streaming->header.bTriggerSupport = buffer[10];
 719                 streaming->header.bTriggerUsage = buffer[11];
 720         } else {
 721                 streaming->header.bTerminalLink = buffer[7];
 722         }
 723         streaming->header.bControlSize = n;
 724
 725         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 726                                                 GFP_KERNEL);
 727         if (streaming->header.bmaControls == NULL) {
 728                 ret = -ENOMEM;
 729                 goto error;
 730         }
 731
 732         buflen -= buffer[0];
 733         buffer += buffer[0];
 734
 735         _buffer = buffer;
 736         _buflen = buflen;
 737
 738         /* Count the format and frame descriptors. */
 739         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 740                 switch (_buffer[2]) {
 741                 case UVC_VS_FORMAT_UNCOMPRESSED:
 742                 case UVC_VS_FORMAT_MJPEG:
 743                 case UVC_VS_FORMAT_FRAME_BASED:
 744                         nformats++;
 745                         break;
 746
 747                 case UVC_VS_FORMAT_DV:
 748                         /* DV format has no frame descriptor. We will create a
 749                          * dummy frame descriptor with a dummy frame interval.
 750                          */
 751                         nformats++;
 752                         nframes++;
 753                         nintervals++;
 754                         break;
 755
 756                 case UVC_VS_FORMAT_MPEG2TS:
 757                 case UVC_VS_FORMAT_STREAM_BASED:
 758                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 759                                 "interface %d FORMAT %u is not supported.\n",
 760                                 dev->udev->devnum,
 761                                 alts->desc.bInterfaceNumber, _buffer[2]);
 762                         break;
 763
 764                 case UVC_VS_FRAME_UNCOMPRESSED:
 765                 case UVC_VS_FRAME_MJPEG:
 766                         nframes++;
 767                         if (_buflen > 25)
 768                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 769                         break;
 770
 771                 case UVC_VS_FRAME_FRAME_BASED:
 772                         nframes++;
 773                         if (_buflen > 21)
 774                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 775                         break;
 776                 }
 777
 778                 _buflen -= _buffer[0];
 779                 _buffer += _buffer[0];
 780         }
 781
 782         if (nformats == 0) {
 783                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 784                         "%d has no supported formats defined.\n",
 785                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 786                 goto error;
 787         }
 788
 789         size = nformats * sizeof *format + nframes * sizeof *frame
 790              + nintervals * sizeof *interval;
 791         format = kzalloc(size, GFP_KERNEL);
 792         if (format == NULL) {
 793                 ret = -ENOMEM;
 794                 goto error;
 795         }
 796
 797         frame = (struct uvc_frame *)&format[nformats];
 798         interval = (__u32 *)&frame[nframes];
 799
 800         streaming->format = format;
 801         streaming->nformats = nformats;
 802
 803         /* Parse the format descriptors. */
 804         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 805                 switch (buffer[2]) {
 806                 case UVC_VS_FORMAT_UNCOMPRESSED:
 807                 case UVC_VS_FORMAT_MJPEG:
 808                 case UVC_VS_FORMAT_DV:
 809                 case UVC_VS_FORMAT_FRAME_BASED:
 810                         format->frame = frame;
 811                         ret = uvc_parse_format(dev, streaming, format,
 812                                 &interval, buffer, buflen);
 813                         if (ret < 0)
 814                                 goto error;
 815
 816                         frame += format->nframes;
 817                         format++;
 818
 819                         buflen -= ret;
 820                         buffer += ret;
 821                         continue;
 822
 823                 default:
 824                         break;
 825                 }
 826
 827                 buflen -= buffer[0];
 828                 buffer += buffer[0];
 829         }
 830
 831         if (buflen)
 832                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 833                         "%d has %u bytes of trailing descriptor garbage.\n",
 834                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 835
 836         /* Parse the alternate settings to find the maximum bandwidth. */
 837         for (i = 0; i < intf->num_altsetting; ++i) {
 838                 struct usb_host_endpoint *ep;
 839                 alts = &intf->altsetting[i];
 840                 ep = uvc_find_endpoint(alts,
 841                                 streaming->header.bEndpointAddress);
 842                 if (ep == NULL)
 843                         continue;
 844
 845                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 846                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 847                 if (psize > streaming->maxpsize)
 848                         streaming->maxpsize = psize;
 849         }
 850
 851         list_add_tail(&streaming->list, &dev->streams);
 852         return 0;
 853
 854 error:
 855         usb_driver_release_interface(&uvc_driver.driver, intf);
 856         usb_put_intf(intf);
 857         kfree(streaming->format);
 858         kfree(streaming->header.bmaControls);
 859         kfree(streaming);
 860         return ret;
 861 }
 862
 863 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
 864                 unsigned int num_pads, unsigned int extra_size)
 865 {
 866         struct uvc_entity *entity;
 867         unsigned int num_inputs;
 868         unsigned int size;
 869         unsigned int i;
 870
 871         extra_size = ALIGN(extra_size, sizeof(*entity->pads));
 872         num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 873         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 874              + num_inputs;
 875         entity = kzalloc(size, GFP_KERNEL);
 876         if (entity == NULL)
 877                 return NULL;
 878
 879         entity->id = id;
 880         entity->type = type;
 881
 882         entity->num_links = 0;
 883         entity->num_pads = num_pads;
 884         entity->pads = ((void *)(entity + 1)) + extra_size;
 885
 886         for (i = 0; i < num_inputs; ++i)
 887                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 888         if (!UVC_ENTITY_IS_OTERM(entity))
 889                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 890
 891         entity->bNrInPins = num_inputs;
 892         entity->baSourceID = (__u8 *)(&entity->pads[num_pads]);
 893
 894         return entity;
 895 }
 896
 897 /* Parse vendor-specific extensions. */
 898 static int uvc_parse_vendor_control(struct uvc_device *dev,
 899         const unsigned char *buffer, int buflen)
 900 {
 901         struct usb_device *udev = dev->udev;
 902         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 903         struct uvc_entity *unit;
 904         unsigned int n, p;
 905         int handled = 0;
 906
 907         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
 908         case 0x046d:            /* Logitech */
 909                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
 910                         break;
 911
 912                 /* Logitech implements several vendor specific functions
 913                  * through vendor specific extension units (LXU).
 914                  *
 915                  * The LXU descriptors are similar to XU descriptors
 916                  * (see "USB Device Video Class for Video Devices", section
 917                  * 3.7.2.6 "Extension Unit Descriptor") with the following
 918                  * differences:
 919                  *
 920                  * ----------------------------------------------------------
 921                  * 0            bLength         1        Number
 922                  *      Size of this descriptor, in bytes: 24+p+n*2
 923                  * ----------------------------------------------------------
 924                  * 23+p+n       bmControlsType  N       Bitmap
 925                  *      Individual bits in the set are defined:
 926                  *      0: Absolute
 927                  *      1: Relative
 928                  *
 929                  *      This bitset is mapped exactly the same as bmControls.
 930                  * ----------------------------------------------------------
 931                  * 23+p+n*2     bReserved       1       Boolean
 932                  * ----------------------------------------------------------
 933                  * 24+p+n*2     iExtension      1       Index
 934                  *      Index of a string descriptor that describes this
 935                  *      extension unit.
 936                  * ----------------------------------------------------------
 937                  */
 938                 p = buflen >= 22 ? buffer[21] : 0;
 939                 n = buflen >= 25 + p ? buffer[22+p] : 0;
 940
 941                 if (buflen < 25 + p + 2*n) {
 942                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 943                                 "interface %d EXTENSION_UNIT error\n",
 944                                 udev->devnum, alts->desc.bInterfaceNumber);
 945                         break;
 946                 }
 947
 948                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
 949                                         p + 1, 2*n);
 950                 if (unit == NULL)
 951                         return -ENOMEM;
 952
 953                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
 954                 unit->extension.bNumControls = buffer[20];
 955                 memcpy(unit->baSourceID, &buffer[22], p);
 956                 unit->extension.bControlSize = buffer[22+p];
 957                 unit->extension.bmControls = (__u8 *)unit + sizeof(*unit);
 958                 unit->extension.bmControlsType = (__u8 *)unit + sizeof(*unit)
 959                                                + n;
 960                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 961
 962                 if (buffer[24+p+2*n] != 0)
 963                         usb_string(udev, buffer[24+p+2*n], unit->name,
 964                                    sizeof unit->name);
 965                 else
 966                         sprintf(unit->name, "Extension %u", buffer[3]);
 967
 968                 list_add_tail(&unit->list, &dev->entities);
 969                 handled = 1;
 970                 break;
 971         }
 972
 973         return handled;
 974 }
 975
 976 static int uvc_parse_standard_control(struct uvc_device *dev,
 977         const unsigned char *buffer, int buflen)
 978 {
 979         struct usb_device *udev = dev->udev;
 980         struct uvc_entity *unit, *term;
 981         struct usb_interface *intf;
 982         struct usb_host_interface *alts = dev->intf->cur_altsetting;
 983         unsigned int i, n, p, len;
 984         __u16 type;
 985
 986         switch (buffer[2]) {
 987         case UVC_VC_HEADER:
 988                 n = buflen >= 12 ? buffer[11] : 0;
 989
 990                 if (buflen < 12 + n) {
 991                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
 992                                 "interface %d HEADER error\n", udev->devnum,
 993                                 alts->desc.bInterfaceNumber);
 994                         return -EINVAL;
 995                 }
 996
 997                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
 998                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 999
1000                 /* Parse all USB Video Streaming interfaces. */
1001                 for (i = 0; i < n; ++i) {
1002                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
1003                         if (intf == NULL) {
1004                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
1005                                         "interface %d doesn't exists\n",
1006                                         udev->devnum, i);
1007                                 continue;
1008                         }
1009
1010                         uvc_parse_streaming(dev, intf);
1011                 }
1012                 break;
1013
1014         case UVC_VC_INPUT_TERMINAL:
1015                 if (buflen < 8) {
1016                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1017                                 "interface %d INPUT_TERMINAL error\n",
1018                                 udev->devnum, alts->desc.bInterfaceNumber);
1019                         return -EINVAL;
1020                 }
1021
1022                 /* Make sure the terminal type MSB is not null, otherwise it
1023                  * could be confused with a unit.
1024                  */
1025                 type = get_unaligned_le16(&buffer[4]);
1026                 if ((type & 0xff00) == 0) {
1027                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1028                                 "interface %d INPUT_TERMINAL %d has invalid "
1029                                 "type 0x%04x, skipping\n", udev->devnum,
1030                                 alts->desc.bInterfaceNumber,
1031                                 buffer[3], type);
1032                         return 0;
1033                 }
1034
1035                 n = 0;
1036                 p = 0;
1037                 len = 8;
1038
1039                 if (type == UVC_ITT_CAMERA) {
1040                         n = buflen >= 15 ? buffer[14] : 0;
1041                         len = 15;
1042
1043                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1044                         n = buflen >= 9 ? buffer[8] : 0;
1045                         p = buflen >= 10 + n ? buffer[9+n] : 0;
1046                         len = 10;
1047                 }
1048
1049                 if (buflen < len + n + p) {
1050                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1051                                 "interface %d INPUT_TERMINAL error\n",
1052                                 udev->devnum, alts->desc.bInterfaceNumber);
1053                         return -EINVAL;
1054                 }
1055
1056                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
1057                                         1, n + p);
1058                 if (term == NULL)
1059                         return -ENOMEM;
1060
1061                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1062                         term->camera.bControlSize = n;
1063                         term->camera.bmControls = (__u8 *)term + sizeof *term;
1064                         term->camera.wObjectiveFocalLengthMin =
1065                                 get_unaligned_le16(&buffer[8]);
1066                         term->camera.wObjectiveFocalLengthMax =
1067                                 get_unaligned_le16(&buffer[10]);
1068                         term->camera.wOcularFocalLength =
1069                                 get_unaligned_le16(&buffer[12]);
1070                         memcpy(term->camera.bmControls, &buffer[15], n);
1071                 } else if (UVC_ENTITY_TYPE(term) ==
1072                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1073                         term->media.bControlSize = n;
1074                         term->media.bmControls = (__u8 *)term + sizeof *term;
1075                         term->media.bTransportModeSize = p;
1076                         term->media.bmTransportModes = (__u8 *)term
1077                                                      + sizeof *term + n;
1078                         memcpy(term->media.bmControls, &buffer[9], n);
1079                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1080                 }
1081
1082                 if (buffer[7] != 0)
1083                         usb_string(udev, buffer[7], term->name,
1084                                    sizeof term->name);
1085                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1086                         sprintf(term->name, "Camera %u", buffer[3]);
1087                 else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1088                         sprintf(term->name, "Media %u", buffer[3]);
1089                 else
1090                         sprintf(term->name, "Input %u", buffer[3]);
1091
1092                 list_add_tail(&term->list, &dev->entities);
1093                 break;
1094
1095         case UVC_VC_OUTPUT_TERMINAL:
1096                 if (buflen < 9) {
1097                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1098                                 "interface %d OUTPUT_TERMINAL error\n",
1099                                 udev->devnum, alts->desc.bInterfaceNumber);
1100                         return -EINVAL;
1101                 }
1102
1103                 /* Make sure the terminal type MSB is not null, otherwise it
1104                  * could be confused with a unit.
1105                  */
1106                 type = get_unaligned_le16(&buffer[4]);
1107                 if ((type & 0xff00) == 0) {
1108                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1109                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1110                                 "type 0x%04x, skipping\n", udev->devnum,
1111                                 alts->desc.bInterfaceNumber, buffer[3], type);
1112                         return 0;
1113                 }
1114
1115                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1116                                         1, 0);
1117                 if (term == NULL)
1118                         return -ENOMEM;
1119
1120                 memcpy(term->baSourceID, &buffer[7], 1);
1121
1122                 if (buffer[8] != 0)
1123                         usb_string(udev, buffer[8], term->name,
1124                                    sizeof term->name);
1125                 else
1126                         sprintf(term->name, "Output %u", buffer[3]);
1127
1128                 list_add_tail(&term->list, &dev->entities);
1129                 break;
1130
1131         case UVC_VC_SELECTOR_UNIT:
1132                 p = buflen >= 5 ? buffer[4] : 0;
1133
1134                 if (buflen < 5 || buflen < 6 + p) {
1135                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1136                                 "interface %d SELECTOR_UNIT error\n",
1137                                 udev->devnum, alts->desc.bInterfaceNumber);
1138                         return -EINVAL;
1139                 }
1140
1141                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1142                 if (unit == NULL)
1143                         return -ENOMEM;
1144
1145                 memcpy(unit->baSourceID, &buffer[5], p);
1146
1147                 if (buffer[5+p] != 0)
1148                         usb_string(udev, buffer[5+p], unit->name,
1149                                    sizeof unit->name);
1150                 else
1151                         sprintf(unit->name, "Selector %u", buffer[3]);
1152
1153                 list_add_tail(&unit->list, &dev->entities);
1154                 break;
1155
1156         case UVC_VC_PROCESSING_UNIT:
1157                 n = buflen >= 8 ? buffer[7] : 0;
1158                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1159
1160                 if (buflen < p + n) {
1161                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1162                                 "interface %d PROCESSING_UNIT error\n",
1163                                 udev->devnum, alts->desc.bInterfaceNumber);
1164                         return -EINVAL;
1165                 }
1166
1167                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1168                 if (unit == NULL)
1169                         return -ENOMEM;
1170
1171                 memcpy(unit->baSourceID, &buffer[4], 1);
1172                 unit->processing.wMaxMultiplier =
1173                         get_unaligned_le16(&buffer[5]);
1174                 unit->processing.bControlSize = buffer[7];
1175                 unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
1176                 memcpy(unit->processing.bmControls, &buffer[8], n);
1177                 if (dev->uvc_version >= 0x0110)
1178                         unit->processing.bmVideoStandards = buffer[9+n];
1179
1180                 if (buffer[8+n] != 0)
1181                         usb_string(udev, buffer[8+n], unit->name,
1182                                    sizeof unit->name);
1183                 else
1184                         sprintf(unit->name, "Processing %u", buffer[3]);
1185
1186                 list_add_tail(&unit->list, &dev->entities);
1187                 break;
1188
1189         case UVC_VC_EXTENSION_UNIT:
1190                 p = buflen >= 22 ? buffer[21] : 0;
1191                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1192
1193                 if (buflen < 24 + p + n) {
1194                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1195                                 "interface %d EXTENSION_UNIT error\n",
1196                                 udev->devnum, alts->desc.bInterfaceNumber);
1197                         return -EINVAL;
1198                 }
1199
1200                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1201                 if (unit == NULL)
1202                         return -ENOMEM;
1203
1204                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1205                 unit->extension.bNumControls = buffer[20];
1206                 memcpy(unit->baSourceID, &buffer[22], p);
1207                 unit->extension.bControlSize = buffer[22+p];
1208                 unit->extension.bmControls = (__u8 *)unit + sizeof *unit;
1209                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1210
1211                 if (buffer[23+p+n] != 0)
1212                         usb_string(udev, buffer[23+p+n], unit->name,
1213                                    sizeof unit->name);
1214                 else
1215                         sprintf(unit->name, "Extension %u", buffer[3]);
1216
1217                 list_add_tail(&unit->list, &dev->entities);
1218                 break;
1219
1220         default:
1221                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1222                         "descriptor (%u)\n", buffer[2]);
1223                 break;
1224         }
1225
1226         return 0;
1227 }
1228
1229 static int uvc_parse_control(struct uvc_device *dev)
1230 {
1231         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1232         unsigned char *buffer = alts->extra;
1233         int buflen = alts->extralen;
1234         int ret;
1235
1236         /* Parse the default alternate setting only, as the UVC specification
1237          * defines a single alternate setting, the default alternate setting
1238          * zero.
1239          */
1240
1241         while (buflen > 2) {
1242                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1243                     buffer[1] != USB_DT_CS_INTERFACE)
1244                         goto next_descriptor;
1245
1246                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1247                         return ret;
1248
1249 next_descriptor:
1250                 buflen -= buffer[0];
1251                 buffer += buffer[0];
1252         }
1253
1254         /* Check if the optional status endpoint is present. Built-in iSight
1255          * webcams have an interrupt endpoint but spit proprietary data that
1256          * don't conform to the UVC status endpoint messages. Don't try to
1257          * handle the interrupt endpoint for those cameras.
1258          */
1259         if (alts->desc.bNumEndpoints == 1 &&
1260             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1261                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1262                 struct usb_endpoint_descriptor *desc = &ep->desc;
1263
1264                 if (usb_endpoint_is_int_in(desc) &&
1265                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1266                     desc->bInterval != 0) {
1267                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1268                                 "(addr %02x).\n", desc->bEndpointAddress);
1269                         dev->int_ep = ep;
1270                 }
1271         }
1272
1273         return 0;
1274 }
1275
1276 /* ------------------------------------------------------------------------
1277  * UVC device scan
1278  */
1279
1280 /*
1281  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1282  * and containing the following units:
1283  *
1284  * - one or more Output Terminals (USB Streaming or Display)
1285  * - zero or one Processing Unit
1286  * - zero, one or more single-input Selector Units
1287  * - zero or one multiple-input Selector Units, provided all inputs are
1288  *   connected to input terminals
1289  * - zero, one or mode single-input Extension Units
1290  * - one or more Input Terminals (Camera, External or USB Streaming)
1291  *
1292  * The terminal and units must match on of the following structures:
1293  *
1294  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1295  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1296  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1297  *
1298  *                 +---------+    +---------+ -> OTT_*(0)
1299  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1300  *                 +---------+    +---------+ -> OTT_*(n)
1301  *
1302  * The Processing Unit and Extension Units can be in any order. Additional
1303  * Extension Units connected to the main chain as single-unit branches are
1304  * also supported. Single-input Selector Units are ignored.
1305  */
1306 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1307         struct uvc_entity *entity)
1308 {
1309         switch (UVC_ENTITY_TYPE(entity)) {
1310         case UVC_VC_EXTENSION_UNIT:
1311                 if (uvc_trace_param & UVC_TRACE_PROBE)
1312                         printk(" <- XU %d", entity->id);
1313
1314                 if (entity->bNrInPins != 1) {
1315                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1316                                 "than 1 input pin.\n", entity->id);
1317                         return -1;
1318                 }
1319
1320                 break;
1321
1322         case UVC_VC_PROCESSING_UNIT:
1323                 if (uvc_trace_param & UVC_TRACE_PROBE)
1324                         printk(" <- PU %d", entity->id);
1325
1326                 if (chain->processing != NULL) {
1327                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1328                                 "Processing Units in chain.\n");
1329                         return -1;
1330                 }
1331
1332                 chain->processing = entity;
1333                 break;
1334
1335         case UVC_VC_SELECTOR_UNIT:
1336                 if (uvc_trace_param & UVC_TRACE_PROBE)
1337                         printk(" <- SU %d", entity->id);
1338
1339                 /* Single-input selector units are ignored. */
1340                 if (entity->bNrInPins == 1)
1341                         break;
1342
1343                 if (chain->selector != NULL) {
1344                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1345                                 "Units in chain.\n");
1346                         return -1;
1347                 }
1348
1349                 chain->selector = entity;
1350                 break;
1351
1352         case UVC_ITT_VENDOR_SPECIFIC:
1353         case UVC_ITT_CAMERA:
1354         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1355                 if (uvc_trace_param & UVC_TRACE_PROBE)
1356                         printk(" <- IT %d\n", entity->id);
1357
1358                 break;
1359
1360         case UVC_OTT_VENDOR_SPECIFIC:
1361         case UVC_OTT_DISPLAY:
1362         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1363                 if (uvc_trace_param & UVC_TRACE_PROBE)
1364                         printk(" OT %d", entity->id);
1365
1366                 break;
1367
1368         case UVC_TT_STREAMING:
1369                 if (UVC_ENTITY_IS_ITERM(entity)) {
1370                         if (uvc_trace_param & UVC_TRACE_PROBE)
1371                                 printk(" <- IT %d\n", entity->id);
1372                 } else {
1373                         if (uvc_trace_param & UVC_TRACE_PROBE)
1374                                 printk(" OT %d", entity->id);
1375                 }
1376
1377                 break;
1378
1379         default:
1380                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1381                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1382                 return -1;
1383         }
1384
1385         list_add_tail(&entity->chain, &chain->entities);
1386         return 0;
1387 }
1388
1389 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1390         struct uvc_entity *entity, struct uvc_entity *prev)
1391 {
1392         struct uvc_entity *forward;
1393         int found;
1394
1395         /* Forward scan */
1396         forward = NULL;
1397         found = 0;
1398
1399         while (1) {
1400                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1401                         forward);
1402                 if (forward == NULL)
1403                         break;
1404                 if (forward == prev)
1405                         continue;
1406
1407                 switch (UVC_ENTITY_TYPE(forward)) {
1408                 case UVC_VC_EXTENSION_UNIT:
1409                         if (forward->bNrInPins != 1) {
1410                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1411                                           "has more than 1 input pin.\n",
1412                                           entity->id);
1413                                 return -EINVAL;
1414                         }
1415
1416                         list_add_tail(&forward->chain, &chain->entities);
1417                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1418                                 if (!found)
1419                                         printk(" (->");
1420
1421                                 printk(" XU %d", forward->id);
1422                                 found = 1;
1423                         }
1424                         break;
1425
1426                 case UVC_OTT_VENDOR_SPECIFIC:
1427                 case UVC_OTT_DISPLAY:
1428                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1429                 case UVC_TT_STREAMING:
1430                         if (UVC_ENTITY_IS_ITERM(forward)) {
1431                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1432                                         "terminal %u.\n", forward->id);
1433                                 return -EINVAL;
1434                         }
1435
1436                         list_add_tail(&forward->chain, &chain->entities);
1437                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1438                                 if (!found)
1439                                         printk(" (->");
1440
1441                                 printk(" OT %d", forward->id);
1442                                 found = 1;
1443                         }
1444                         break;
1445                 }
1446         }
1447         if (found)
1448                 printk(")");
1449
1450         return 0;
1451 }
1452
1453 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1454         struct uvc_entity **_entity)
1455 {
1456         struct uvc_entity *entity = *_entity;
1457         struct uvc_entity *term;
1458         int id = -EINVAL, i;
1459
1460         switch (UVC_ENTITY_TYPE(entity)) {
1461         case UVC_VC_EXTENSION_UNIT:
1462         case UVC_VC_PROCESSING_UNIT:
1463                 id = entity->baSourceID[0];
1464                 break;
1465
1466         case UVC_VC_SELECTOR_UNIT:
1467                 /* Single-input selector units are ignored. */
1468                 if (entity->bNrInPins == 1) {
1469                         id = entity->baSourceID[0];
1470                         break;
1471                 }
1472
1473                 if (uvc_trace_param & UVC_TRACE_PROBE)
1474                         printk(" <- IT");
1475
1476                 chain->selector = entity;
1477                 for (i = 0; i < entity->bNrInPins; ++i) {
1478                         id = entity->baSourceID[i];
1479                         term = uvc_entity_by_id(chain->dev, id);
1480                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1481                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1482                                         "input %d isn't connected to an "
1483                                         "input terminal\n", entity->id, i);
1484                                 return -1;
1485                         }
1486
1487                         if (uvc_trace_param & UVC_TRACE_PROBE)
1488                                 printk(" %d", term->id);
1489
1490                         list_add_tail(&term->chain, &chain->entities);
1491                         uvc_scan_chain_forward(chain, term, entity);
1492                 }
1493
1494                 if (uvc_trace_param & UVC_TRACE_PROBE)
1495                         printk("\n");
1496
1497                 id = 0;
1498                 break;
1499
1500         case UVC_ITT_VENDOR_SPECIFIC:
1501         case UVC_ITT_CAMERA:
1502         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1503         case UVC_OTT_VENDOR_SPECIFIC:
1504         case UVC_OTT_DISPLAY:
1505         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1506         case UVC_TT_STREAMING:
1507                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1508                 break;
1509         }
1510
1511         if (id <= 0) {
1512                 *_entity = NULL;
1513                 return id;
1514         }
1515
1516         entity = uvc_entity_by_id(chain->dev, id);
1517         if (entity == NULL) {
1518                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1519                         "unknown entity %d.\n", id);
1520                 return -EINVAL;
1521         }
1522
1523         *_entity = entity;
1524         return 0;
1525 }
1526
1527 static int uvc_scan_chain(struct uvc_video_chain *chain,
1528                           struct uvc_entity *term)
1529 {
1530         struct uvc_entity *entity, *prev;
1531
1532         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1533
1534         entity = term;
1535         prev = NULL;
1536
1537         while (entity != NULL) {
1538                 /* Entity must not be part of an existing chain */
1539                 if (entity->chain.next || entity->chain.prev) {
1540                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1541                                 "entity %d already in chain.\n", entity->id);
1542                         return -EINVAL;
1543                 }
1544
1545                 /* Process entity */
1546                 if (uvc_scan_chain_entity(chain, entity) < 0)
1547                         return -EINVAL;
1548
1549                 /* Forward scan */
1550                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1551                         return -EINVAL;
1552
1553                 /* Backward scan */
1554                 prev = entity;
1555                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1556                         return -EINVAL;
1557         }
1558
1559         return 0;
1560 }
1561
1562 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1563                 char *buffer)
1564 {
1565         struct uvc_entity *term;
1566         unsigned int nterms = 0;
1567         char *p = buffer;
1568
1569         list_for_each_entry(term, terms, chain) {
1570                 if (!UVC_ENTITY_IS_TERM(term) ||
1571                     UVC_TERM_DIRECTION(term) != dir)
1572                         continue;
1573
1574                 if (nterms)
1575                         p += sprintf(p, ",");
1576                 if (++nterms >= 4) {
1577                         p += sprintf(p, "...");
1578                         break;
1579                 }
1580                 p += sprintf(p, "%u", term->id);
1581         }
1582
1583         return p - buffer;
1584 }
1585
1586 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1587 {
1588         static char buffer[43];
1589         char *p = buffer;
1590
1591         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1592         p += sprintf(p, " -> ");
1593         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1594
1595         return buffer;
1596 }
1597
1598 /*
1599  * Scan the device for video chains and register video devices.
1600  *
1601  * Chains are scanned starting at their output terminals and walked backwards.
1602  */
1603 static int uvc_scan_device(struct uvc_device *dev)
1604 {
1605         struct uvc_video_chain *chain;
1606         struct uvc_entity *term;
1607
1608         list_for_each_entry(term, &dev->entities, list) {
1609                 if (!UVC_ENTITY_IS_OTERM(term))
1610                         continue;
1611
1612                 /* If the terminal is already included in a chain, skip it.
1613                  * This can happen for chains that have multiple output
1614                  * terminals, where all output terminals beside the first one
1615                  * will be inserted in the chain in forward scans.
1616                  */
1617                 if (term->chain.next || term->chain.prev)
1618                         continue;
1619
1620                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1621                 if (chain == NULL)
1622                         return -ENOMEM;
1623
1624                 INIT_LIST_HEAD(&chain->entities);
1625                 mutex_init(&chain->ctrl_mutex);
1626                 chain->dev = dev;
1627                 v4l2_prio_init(&chain->prio);
1628
1629                 term->flags |= UVC_ENTITY_FLAG_DEFAULT;
1630
1631                 if (uvc_scan_chain(chain, term) < 0) {
1632                         kfree(chain);
1633                         continue;
1634                 }
1635
1636                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1637                           uvc_print_chain(chain));
1638
1639                 list_add_tail(&chain->list, &dev->chains);
1640         }
1641
1642         if (list_empty(&dev->chains)) {
1643                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1644                 return -1;
1645         }
1646
1647         return 0;
1648 }
1649
1650 /* ------------------------------------------------------------------------
1651  * Video device registration and unregistration
1652  */
1653
1654 /*
1655  * Delete the UVC device.
1656  *
1657  * Called by the kernel when the last reference to the uvc_device structure
1658  * is released.
1659  *
1660  * As this function is called after or during disconnect(), all URBs have
1661  * already been canceled by the USB core. There is no need to kill the
1662  * interrupt URB manually.
1663  */
1664 static void uvc_delete(struct uvc_device *dev)
1665 {
1666         struct list_head *p, *n;
1667
1668         uvc_status_cleanup(dev);
1669         uvc_ctrl_cleanup_device(dev);
1670
1671         usb_put_intf(dev->intf);
1672         usb_put_dev(dev->udev);
1673
1674         if (dev->vdev.dev)
1675                 v4l2_device_unregister(&dev->vdev);
1676 #ifdef CONFIG_MEDIA_CONTROLLER
1677         if (media_devnode_is_registered(&dev->mdev.devnode))
1678                 media_device_unregister(&dev->mdev);
1679 #endif
1680
1681         list_for_each_safe(p, n, &dev->chains) {
1682                 struct uvc_video_chain *chain;
1683                 chain = list_entry(p, struct uvc_video_chain, list);
1684                 kfree(chain);
1685         }
1686
1687         list_for_each_safe(p, n, &dev->entities) {
1688                 struct uvc_entity *entity;
1689                 entity = list_entry(p, struct uvc_entity, list);
1690 #ifdef CONFIG_MEDIA_CONTROLLER
1691                 uvc_mc_cleanup_entity(entity);
1692 #endif
1693                 kfree(entity);
1694         }
1695
1696         list_for_each_safe(p, n, &dev->streams) {
1697                 struct uvc_streaming *streaming;
1698                 streaming = list_entry(p, struct uvc_streaming, list);
1699                 usb_driver_release_interface(&uvc_driver.driver,
1700                         streaming->intf);
1701                 usb_put_intf(streaming->intf);
1702                 kfree(streaming->format);
1703                 kfree(streaming->header.bmaControls);
1704                 kfree(streaming);
1705         }
1706
1707         kfree(dev);
1708 }
1709
1710 static void uvc_release(struct video_device *vdev)
1711 {
1712         struct uvc_streaming *stream = video_get_drvdata(vdev);
1713         struct uvc_device *dev = stream->dev;
1714
1715         /* Decrement the registered streams count and delete the device when it
1716          * reaches zero.
1717          */
1718         if (atomic_dec_and_test(&dev->nstreams))
1719                 uvc_delete(dev);
1720 }
1721
1722 /*
1723  * Unregister the video devices.
1724  */
1725 static void uvc_unregister_video(struct uvc_device *dev)
1726 {
1727         struct uvc_streaming *stream;
1728
1729         /* Unregistering all video devices might result in uvc_delete() being
1730          * called from inside the loop if there's no open file handle. To avoid
1731          * that, increment the stream count before iterating over the streams
1732          * and decrement it when done.
1733          */
1734         atomic_inc(&dev->nstreams);
1735
1736         list_for_each_entry(stream, &dev->streams, list) {
1737                 if (!video_is_registered(&stream->vdev))
1738                         continue;
1739
1740                 video_unregister_device(&stream->vdev);
1741
1742                 uvc_debugfs_cleanup_stream(stream);
1743         }
1744
1745         /* Decrement the stream count and call uvc_delete explicitly if there
1746          * are no stream left.
1747          */
1748         if (atomic_dec_and_test(&dev->nstreams))
1749                 uvc_delete(dev);
1750 }
1751
1752 static int uvc_register_video(struct uvc_device *dev,
1753                 struct uvc_streaming *stream)
1754 {
1755         struct video_device *vdev = &stream->vdev;
1756         int ret;
1757
1758         /* Initialize the video buffers queue. */
1759         ret = uvc_queue_init(&stream->queue, stream->type, !uvc_no_drop_param);
1760         if (ret)
1761                 return ret;
1762
1763         /* Initialize the streaming interface with default streaming
1764          * parameters.
1765          */
1766         ret = uvc_video_init(stream);
1767         if (ret < 0) {
1768                 uvc_printk(KERN_ERR, "Failed to initialize the device "
1769                         "(%d).\n", ret);
1770                 return ret;
1771         }
1772
1773         uvc_debugfs_init_stream(stream);
1774
1775         /* Register the device with V4L. */
1776
1777         /* We already hold a reference to dev->udev. The video device will be
1778          * unregistered before the reference is released, so we don't need to
1779          * get another one.
1780          */
1781         vdev->v4l2_dev = &dev->vdev;
1782         vdev->fops = &uvc_fops;
1783         vdev->ioctl_ops = &uvc_ioctl_ops;
1784         vdev->release = uvc_release;
1785         vdev->prio = &stream->chain->prio;
1786         if (stream->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1787                 vdev->vfl_dir = VFL_DIR_TX;
1788         strlcpy(vdev->name, dev->name, sizeof vdev->name);
1789
1790         /* Set the driver data before calling video_register_device, otherwise
1791          * uvc_v4l2_open might race us.
1792          */
1793         video_set_drvdata(vdev, stream);
1794
1795         ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
1796         if (ret < 0) {
1797                 uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
1798                            ret);
1799                 return ret;
1800         }
1801
1802         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1803                 stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE;
1804         else
1805                 stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
1806
1807         atomic_inc(&dev->nstreams);
1808         return 0;
1809 }
1810
1811 /*
1812  * Register all video devices in all chains.
1813  */
1814 static int uvc_register_terms(struct uvc_device *dev,
1815         struct uvc_video_chain *chain)
1816 {
1817         struct uvc_streaming *stream;
1818         struct uvc_entity *term;
1819         int ret;
1820
1821         list_for_each_entry(term, &chain->entities, chain) {
1822                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
1823                         continue;
1824
1825                 stream = uvc_stream_by_id(dev, term->id);
1826                 if (stream == NULL) {
1827                         uvc_printk(KERN_INFO, "No streaming interface found "
1828                                    "for terminal %u.", term->id);
1829                         continue;
1830                 }
1831
1832                 stream->chain = chain;
1833                 ret = uvc_register_video(dev, stream);
1834                 if (ret < 0)
1835                         return ret;
1836
1837                 term->vdev = &stream->vdev;
1838         }
1839
1840         return 0;
1841 }
1842
1843 static int uvc_register_chains(struct uvc_device *dev)
1844 {
1845         struct uvc_video_chain *chain;
1846         int ret;
1847
1848         list_for_each_entry(chain, &dev->chains, list) {
1849                 ret = uvc_register_terms(dev, chain);
1850                 if (ret < 0)
1851                         return ret;
1852
1853 #ifdef CONFIG_MEDIA_CONTROLLER
1854                 ret = uvc_mc_register_entities(chain);
1855                 if (ret < 0) {
1856                         uvc_printk(KERN_INFO, "Failed to register entites "
1857                                 "(%d).\n", ret);
1858                 }
1859 #endif
1860         }
1861
1862         return 0;
1863 }
1864
1865 /* ------------------------------------------------------------------------
1866  * USB probe, disconnect, suspend and resume
1867  */
1868
1869 static int uvc_probe(struct usb_interface *intf,
1870                      const struct usb_device_id *id)
1871 {
1872         struct usb_device *udev = interface_to_usbdev(intf);
1873         struct uvc_device *dev;
1874         int ret;
1875
1876         if (id->idVendor && id->idProduct)
1877                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
1878                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
1879                                 id->idProduct);
1880         else
1881                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
1882                                 udev->devpath);
1883
1884         /* Allocate memory for the device and initialize it. */
1885         if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
1886                 return -ENOMEM;
1887
1888         INIT_LIST_HEAD(&dev->entities);
1889         INIT_LIST_HEAD(&dev->chains);
1890         INIT_LIST_HEAD(&dev->streams);
1891         atomic_set(&dev->nstreams, 0);
1892         atomic_set(&dev->nmappings, 0);
1893         mutex_init(&dev->lock);
1894
1895         dev->udev = usb_get_dev(udev);
1896         dev->intf = usb_get_intf(intf);
1897         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
1898         dev->quirks = (uvc_quirks_param == -1)
1899                     ? id->driver_info : uvc_quirks_param;
1900
1901         if (udev->product != NULL)
1902                 strlcpy(dev->name, udev->product, sizeof dev->name);
1903         else
1904                 snprintf(dev->name, sizeof dev->name,
1905                         "UVC Camera (%04x:%04x)",
1906                         le16_to_cpu(udev->descriptor.idVendor),
1907                         le16_to_cpu(udev->descriptor.idProduct));
1908
1909         /* Parse the Video Class control descriptor. */
1910         if (uvc_parse_control(dev) < 0) {
1911                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
1912                         "descriptors.\n");
1913                 goto error;
1914         }
1915
1916         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
1917                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
1918                 udev->product ? udev->product : "<unnamed>",
1919                 le16_to_cpu(udev->descriptor.idVendor),
1920                 le16_to_cpu(udev->descriptor.idProduct));
1921
1922         if (dev->quirks != id->driver_info) {
1923                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
1924                         "parameter for testing purpose.\n", dev->quirks);
1925                 uvc_printk(KERN_INFO, "Please report required quirks to the "
1926                         "linux-uvc-devel mailing list.\n");
1927         }
1928
1929         /* Register the media and V4L2 devices. */
1930 #ifdef CONFIG_MEDIA_CONTROLLER
1931         dev->mdev.dev = &intf->dev;
1932         strlcpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
1933         if (udev->serial)
1934                 strlcpy(dev->mdev.serial, udev->serial,
1935                         sizeof(dev->mdev.serial));
1936         strcpy(dev->mdev.bus_info, udev->devpath);
1937         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
1938         dev->mdev.driver_version = LINUX_VERSION_CODE;
1939         if (media_device_register(&dev->mdev) < 0)
1940                 goto error;
1941
1942         dev->vdev.mdev = &dev->mdev;
1943 #endif
1944         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
1945                 goto error;
1946
1947         /* Initialize controls. */
1948         if (uvc_ctrl_init_device(dev) < 0)
1949                 goto error;
1950
1951         /* Scan the device for video chains. */
1952         if (uvc_scan_device(dev) < 0)
1953                 goto error;
1954
1955         /* Register video device nodes. */
1956         if (uvc_register_chains(dev) < 0)
1957                 goto error;
1958
1959         /* Save our data pointer in the interface data. */
1960         usb_set_intfdata(intf, dev);
1961
1962         /* Initialize the interrupt URB. */
1963         if ((ret = uvc_status_init(dev)) < 0) {
1964                 uvc_printk(KERN_INFO, "Unable to initialize the status "
1965                         "endpoint (%d), status interrupt will not be "
1966                         "supported.\n", ret);
1967         }
1968
1969         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
1970         usb_enable_autosuspend(udev);
1971         return 0;
1972
1973 error:
1974         uvc_unregister_video(dev);
1975         return -ENODEV;
1976 }
1977
1978 static void uvc_disconnect(struct usb_interface *intf)
1979 {
1980         struct uvc_device *dev = usb_get_intfdata(intf);
1981
1982         /* Set the USB interface data to NULL. This can be done outside the
1983          * lock, as there's no other reader.
1984          */
1985         usb_set_intfdata(intf, NULL);
1986
1987         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
1988             UVC_SC_VIDEOSTREAMING)
1989                 return;
1990
1991         uvc_unregister_video(dev);
1992 }
1993
1994 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
1995 {
1996         struct uvc_device *dev = usb_get_intfdata(intf);
1997         struct uvc_streaming *stream;
1998
1999         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
2000                 intf->cur_altsetting->desc.bInterfaceNumber);
2001
2002         /* Controls are cached on the fly so they don't need to be saved. */
2003         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2004             UVC_SC_VIDEOCONTROL) {
2005                 mutex_lock(&dev->lock);
2006                 if (dev->users)
2007                         uvc_status_stop(dev);
2008                 mutex_unlock(&dev->lock);
2009                 return 0;
2010         }
2011
2012         list_for_each_entry(stream, &dev->streams, list) {
2013                 if (stream->intf == intf)
2014                         return uvc_video_suspend(stream);
2015         }
2016
2017         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
2018                         "mismatch.\n");
2019         return -EINVAL;
2020 }
2021
2022 static int __uvc_resume(struct usb_interface *intf, int reset)
2023 {
2024         struct uvc_device *dev = usb_get_intfdata(intf);
2025         struct uvc_streaming *stream;
2026         int ret = 0;
2027
2028         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
2029                 intf->cur_altsetting->desc.bInterfaceNumber);
2030
2031         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2032             UVC_SC_VIDEOCONTROL) {
2033                 if (reset) {
2034                         ret = uvc_ctrl_restore_values(dev);
2035                         if (ret < 0)
2036                                 return ret;
2037                 }
2038
2039                 mutex_lock(&dev->lock);
2040                 if (dev->users)
2041                         ret = uvc_status_start(dev, GFP_NOIO);
2042                 mutex_unlock(&dev->lock);
2043
2044                 return ret;
2045         }
2046
2047         list_for_each_entry(stream, &dev->streams, list) {
2048                 if (stream->intf == intf) {
2049                         ret = uvc_video_resume(stream, reset);
2050                         if (ret < 0)
2051                                 uvc_queue_streamoff(&stream->queue,
2052                                                     stream->queue.queue.type);
2053                         return ret;
2054                 }
2055         }
2056
2057         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
2058                         "mismatch.\n");
2059         return -EINVAL;
2060 }
2061
2062 static int uvc_resume(struct usb_interface *intf)
2063 {
2064         return __uvc_resume(intf, 0);
2065 }
2066
2067 static int uvc_reset_resume(struct usb_interface *intf)
2068 {
2069         return __uvc_resume(intf, 1);
2070 }
2071
2072 /* ------------------------------------------------------------------------
2073  * Module parameters
2074  */
2075
2076 static int uvc_clock_param_get(char *buffer, struct kernel_param *kp)
2077 {
2078         if (uvc_clock_param == CLOCK_MONOTONIC)
2079                 return sprintf(buffer, "CLOCK_MONOTONIC");
2080         else
2081                 return sprintf(buffer, "CLOCK_REALTIME");
2082 }
2083
2084 static int uvc_clock_param_set(const char *val, struct kernel_param *kp)
2085 {
2086         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2087                 val += strlen("clock_");
2088
2089         if (strcasecmp(val, "monotonic") == 0)
2090                 uvc_clock_param = CLOCK_MONOTONIC;
2091         else if (strcasecmp(val, "realtime") == 0)
2092                 uvc_clock_param = CLOCK_REALTIME;
2093         else
2094                 return -EINVAL;
2095
2096         return 0;
2097 }
2098
2099 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2100                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2101 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2102 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, S_IRUGO|S_IWUSR);
2103 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
2104 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2105 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2106 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2107 MODULE_PARM_DESC(quirks, "Forced device quirks");
2108 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2109 MODULE_PARM_DESC(trace, "Trace level bitmask");
2110 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2111 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2112
2113 /* ------------------------------------------------------------------------
2114  * Driver initialization and cleanup
2115  */
2116
2117 /*
2118  * The Logitech cameras listed below have their interface class set to
2119  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2120  * though they are compliant.
2121  */
2122 static struct usb_device_id uvc_ids[] = {
2123         /* LogiLink Wireless Webcam */
2124         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2125                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2126           .idVendor             = 0x0416,
2127           .idProduct            = 0xa91a,
2128           .bInterfaceClass      = USB_CLASS_VIDEO,
2129           .bInterfaceSubClass   = 1,
2130           .bInterfaceProtocol   = 0,
2131           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2132         /* Genius eFace 2025 */
2133         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2134                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2135           .idVendor             = 0x0458,
2136           .idProduct            = 0x706e,
2137           .bInterfaceClass      = USB_CLASS_VIDEO,
2138           .bInterfaceSubClass   = 1,
2139           .bInterfaceProtocol   = 0,
2140           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2141         /* Microsoft Lifecam NX-6000 */
2142         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2143                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2144           .idVendor             = 0x045e,
2145           .idProduct            = 0x00f8,
2146           .bInterfaceClass      = USB_CLASS_VIDEO,
2147           .bInterfaceSubClass   = 1,
2148           .bInterfaceProtocol   = 0,
2149           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2150         /* Microsoft Lifecam NX-3000 */
2151         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2152                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2153           .idVendor             = 0x045e,
2154           .idProduct            = 0x0721,
2155           .bInterfaceClass      = USB_CLASS_VIDEO,
2156           .bInterfaceSubClass   = 1,
2157           .bInterfaceProtocol   = 0,
2158           .driver_info          = UVC_QUIRK_PROBE_DEF },
2159         /* Microsoft Lifecam VX-7000 */
2160         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2161                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2162           .idVendor             = 0x045e,
2163           .idProduct            = 0x0723,
2164           .bInterfaceClass      = USB_CLASS_VIDEO,
2165           .bInterfaceSubClass   = 1,
2166           .bInterfaceProtocol   = 0,
2167           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2168         /* Logitech Quickcam Fusion */
2169         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2170                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2171           .idVendor             = 0x046d,
2172           .idProduct            = 0x08c1,
2173           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2174           .bInterfaceSubClass   = 1,
2175           .bInterfaceProtocol   = 0 },
2176         /* Logitech Quickcam Orbit MP */
2177         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2178                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2179           .idVendor             = 0x046d,
2180           .idProduct            = 0x08c2,
2181           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2182           .bInterfaceSubClass   = 1,
2183           .bInterfaceProtocol   = 0 },
2184         /* Logitech Quickcam Pro for Notebook */
2185         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2186                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2187           .idVendor             = 0x046d,
2188           .idProduct            = 0x08c3,
2189           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2190           .bInterfaceSubClass   = 1,
2191           .bInterfaceProtocol   = 0 },
2192         /* Logitech Quickcam Pro 5000 */
2193         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2194                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2195           .idVendor             = 0x046d,
2196           .idProduct            = 0x08c5,
2197           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2198           .bInterfaceSubClass   = 1,
2199           .bInterfaceProtocol   = 0 },
2200         /* Logitech Quickcam OEM Dell Notebook */
2201         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2202                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2203           .idVendor             = 0x046d,
2204           .idProduct            = 0x08c6,
2205           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2206           .bInterfaceSubClass   = 1,
2207           .bInterfaceProtocol   = 0 },
2208         /* Logitech Quickcam OEM Cisco VT Camera II */
2209         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2210                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2211           .idVendor             = 0x046d,
2212           .idProduct            = 0x08c7,
2213           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2214           .bInterfaceSubClass   = 1,
2215           .bInterfaceProtocol   = 0 },
2216         /* Logitech HD Pro Webcam C920 */
2217         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2218                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2219           .idVendor             = 0x046d,
2220           .idProduct            = 0x082d,
2221           .bInterfaceClass      = USB_CLASS_VIDEO,
2222           .bInterfaceSubClass   = 1,
2223           .bInterfaceProtocol   = 0,
2224           .driver_info          = UVC_QUIRK_RESTORE_CTRLS_ON_INIT },
2225         /* Chicony CNF7129 (Asus EEE 100HE) */
2226         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2227                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2228           .idVendor             = 0x04f2,
2229           .idProduct            = 0xb071,
2230           .bInterfaceClass      = USB_CLASS_VIDEO,
2231           .bInterfaceSubClass   = 1,
2232           .bInterfaceProtocol   = 0,
2233           .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
2234         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2235         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2236                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2237           .idVendor             = 0x058f,
2238           .idProduct            = 0x3820,
2239           .bInterfaceClass      = USB_CLASS_VIDEO,
2240           .bInterfaceSubClass   = 1,
2241           .bInterfaceProtocol   = 0,
2242           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2243         /* Dell XPS m1530 */
2244         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2245                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2246           .idVendor             = 0x05a9,
2247           .idProduct            = 0x2640,
2248           .bInterfaceClass      = USB_CLASS_VIDEO,
2249           .bInterfaceSubClass   = 1,
2250           .bInterfaceProtocol   = 0,
2251           .driver_info          = UVC_QUIRK_PROBE_DEF },
2252         /* Dell SP2008WFP Monitor */
2253         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2254                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2255           .idVendor             = 0x05a9,
2256           .idProduct            = 0x2641,
2257           .bInterfaceClass      = USB_CLASS_VIDEO,
2258           .bInterfaceSubClass   = 1,
2259           .bInterfaceProtocol   = 0,
2260           .driver_info          = UVC_QUIRK_PROBE_DEF },
2261         /* Dell Alienware X51 */
2262         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2263                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2264           .idVendor             = 0x05a9,
2265           .idProduct            = 0x2643,
2266           .bInterfaceClass      = USB_CLASS_VIDEO,
2267           .bInterfaceSubClass   = 1,
2268           .bInterfaceProtocol   = 0,
2269           .driver_info  = UVC_QUIRK_PROBE_DEF },
2270         /* Dell Studio Hybrid 140g (OmniVision webcam) */
2271         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2272                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2273           .idVendor             = 0x05a9,
2274           .idProduct            = 0x264a,
2275           .bInterfaceClass      = USB_CLASS_VIDEO,
2276           .bInterfaceSubClass   = 1,
2277           .bInterfaceProtocol   = 0,
2278           .driver_info          = UVC_QUIRK_PROBE_DEF },
2279         /* Dell XPS M1330 (OmniVision OV7670 webcam) */
2280         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2281                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2282           .idVendor             = 0x05a9,
2283           .idProduct            = 0x7670,
2284           .bInterfaceClass      = USB_CLASS_VIDEO,
2285           .bInterfaceSubClass   = 1,
2286           .bInterfaceProtocol   = 0,
2287           .driver_info          = UVC_QUIRK_PROBE_DEF },
2288         /* Apple Built-In iSight */
2289         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2290                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2291           .idVendor             = 0x05ac,
2292           .idProduct            = 0x8501,
2293           .bInterfaceClass      = USB_CLASS_VIDEO,
2294           .bInterfaceSubClass   = 1,
2295           .bInterfaceProtocol   = 0,
2296           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2297                                 | UVC_QUIRK_BUILTIN_ISIGHT },
2298         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2299         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2300                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2301           .idVendor             = 0x05c8,
2302           .idProduct            = 0x0403,
2303           .bInterfaceClass      = USB_CLASS_VIDEO,
2304           .bInterfaceSubClass   = 1,
2305           .bInterfaceProtocol   = 0,
2306           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2307         /* Genesys Logic USB 2.0 PC Camera */
2308         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2309                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2310           .idVendor             = 0x05e3,
2311           .idProduct            = 0x0505,
2312           .bInterfaceClass      = USB_CLASS_VIDEO,
2313           .bInterfaceSubClass   = 1,
2314           .bInterfaceProtocol   = 0,
2315           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2316         /* Hercules Classic Silver */
2317         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2318                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2319           .idVendor             = 0x06f8,
2320           .idProduct            = 0x300c,
2321           .bInterfaceClass      = USB_CLASS_VIDEO,
2322           .bInterfaceSubClass   = 1,
2323           .bInterfaceProtocol   = 0,
2324           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2325         /* ViMicro Vega */
2326         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2327                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2328           .idVendor             = 0x0ac8,
2329           .idProduct            = 0x332d,
2330           .bInterfaceClass      = USB_CLASS_VIDEO,
2331           .bInterfaceSubClass   = 1,
2332           .bInterfaceProtocol   = 0,
2333           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2334         /* ViMicro - Minoru3D */
2335         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2336                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2337           .idVendor             = 0x0ac8,
2338           .idProduct            = 0x3410,
2339           .bInterfaceClass      = USB_CLASS_VIDEO,
2340           .bInterfaceSubClass   = 1,
2341           .bInterfaceProtocol   = 0,
2342           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2343         /* ViMicro Venus - Minoru3D */
2344         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2345                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2346           .idVendor             = 0x0ac8,
2347           .idProduct            = 0x3420,
2348           .bInterfaceClass      = USB_CLASS_VIDEO,
2349           .bInterfaceSubClass   = 1,
2350           .bInterfaceProtocol   = 0,
2351           .driver_info          = UVC_QUIRK_FIX_BANDWIDTH },
2352         /* Ophir Optronics - SPCAM 620U */
2353         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2354                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2355           .idVendor             = 0x0bd3,
2356           .idProduct            = 0x0555,
2357           .bInterfaceClass      = USB_CLASS_VIDEO,
2358           .bInterfaceSubClass   = 1,
2359           .bInterfaceProtocol   = 0,
2360           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2361         /* MT6227 */
2362         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2363                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2364           .idVendor             = 0x0e8d,
2365           .idProduct            = 0x0004,
2366           .bInterfaceClass      = USB_CLASS_VIDEO,
2367           .bInterfaceSubClass   = 1,
2368           .bInterfaceProtocol   = 0,
2369           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2370                                 | UVC_QUIRK_PROBE_DEF },
2371         /* IMC Networks (Medion Akoya) */
2372         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2373                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2374           .idVendor             = 0x13d3,
2375           .idProduct            = 0x5103,
2376           .bInterfaceClass      = USB_CLASS_VIDEO,
2377           .bInterfaceSubClass   = 1,
2378           .bInterfaceProtocol   = 0,
2379           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2380         /* JMicron USB2.0 XGA WebCam */
2381         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2382                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2383           .idVendor             = 0x152d,
2384           .idProduct            = 0x0310,
2385           .bInterfaceClass      = USB_CLASS_VIDEO,
2386           .bInterfaceSubClass   = 1,
2387           .bInterfaceProtocol   = 0,
2388           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2389         /* Syntek (HP Spartan) */
2390         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2391                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2392           .idVendor             = 0x174f,
2393           .idProduct            = 0x5212,
2394           .bInterfaceClass      = USB_CLASS_VIDEO,
2395           .bInterfaceSubClass   = 1,
2396           .bInterfaceProtocol   = 0,
2397           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2398         /* Syntek (Samsung Q310) */
2399         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2400                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2401           .idVendor             = 0x174f,
2402           .idProduct            = 0x5931,
2403           .bInterfaceClass      = USB_CLASS_VIDEO,
2404           .bInterfaceSubClass   = 1,
2405           .bInterfaceProtocol   = 0,
2406           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2407         /* Syntek (Packard Bell EasyNote MX52 */
2408         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2409                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2410           .idVendor             = 0x174f,
2411           .idProduct            = 0x8a12,
2412           .bInterfaceClass      = USB_CLASS_VIDEO,
2413           .bInterfaceSubClass   = 1,
2414           .bInterfaceProtocol   = 0,
2415           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2416         /* Syntek (Asus F9SG) */
2417         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2418                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2419           .idVendor             = 0x174f,
2420           .idProduct            = 0x8a31,
2421           .bInterfaceClass      = USB_CLASS_VIDEO,
2422           .bInterfaceSubClass   = 1,
2423           .bInterfaceProtocol   = 0,
2424           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2425         /* Syntek (Asus U3S) */
2426         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2427                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2428           .idVendor             = 0x174f,
2429           .idProduct            = 0x8a33,
2430           .bInterfaceClass      = USB_CLASS_VIDEO,
2431           .bInterfaceSubClass   = 1,
2432           .bInterfaceProtocol   = 0,
2433           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2434         /* Syntek (JAOtech Smart Terminal) */
2435         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2436                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2437           .idVendor             = 0x174f,
2438           .idProduct            = 0x8a34,
2439           .bInterfaceClass      = USB_CLASS_VIDEO,
2440           .bInterfaceSubClass   = 1,
2441           .bInterfaceProtocol   = 0,
2442           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2443         /* Miricle 307K */
2444         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2445                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2446           .idVendor             = 0x17dc,
2447           .idProduct            = 0x0202,
2448           .bInterfaceClass      = USB_CLASS_VIDEO,
2449           .bInterfaceSubClass   = 1,
2450           .bInterfaceProtocol   = 0,
2451           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2452         /* Lenovo Thinkpad SL400/SL500 */
2453         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2454                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2455           .idVendor             = 0x17ef,
2456           .idProduct            = 0x480b,
2457           .bInterfaceClass      = USB_CLASS_VIDEO,
2458           .bInterfaceSubClass   = 1,
2459           .bInterfaceProtocol   = 0,
2460           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
2461         /* Aveo Technology USB 2.0 Camera */
2462         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2463                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2464           .idVendor             = 0x1871,
2465           .idProduct            = 0x0306,
2466           .bInterfaceClass      = USB_CLASS_VIDEO,
2467           .bInterfaceSubClass   = 1,
2468           .bInterfaceProtocol   = 0,
2469           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2470                                 | UVC_QUIRK_PROBE_EXTRAFIELDS },
2471         /* Aveo Technology USB 2.0 Camera (Tasco USB Microscope) */
2472         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2473                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2474           .idVendor             = 0x1871,
2475           .idProduct            = 0x0516,
2476           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2477           .bInterfaceSubClass   = 1,
2478           .bInterfaceProtocol   = 0 },
2479         /* Ecamm Pico iMage */
2480         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2481                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2482           .idVendor             = 0x18cd,
2483           .idProduct            = 0xcafe,
2484           .bInterfaceClass      = USB_CLASS_VIDEO,
2485           .bInterfaceSubClass   = 1,
2486           .bInterfaceProtocol   = 0,
2487           .driver_info          = UVC_QUIRK_PROBE_EXTRAFIELDS },
2488         /* Manta MM-353 Plako */
2489         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2490                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2491           .idVendor             = 0x18ec,
2492           .idProduct            = 0x3188,
2493           .bInterfaceClass      = USB_CLASS_VIDEO,
2494           .bInterfaceSubClass   = 1,
2495           .bInterfaceProtocol   = 0,
2496           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2497         /* FSC WebCam V30S */
2498         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2499                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2500           .idVendor             = 0x18ec,
2501           .idProduct            = 0x3288,
2502           .bInterfaceClass      = USB_CLASS_VIDEO,
2503           .bInterfaceSubClass   = 1,
2504           .bInterfaceProtocol   = 0,
2505           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2506         /* Arkmicro unbranded */
2507         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2508                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2509           .idVendor             = 0x18ec,
2510           .idProduct            = 0x3290,
2511           .bInterfaceClass      = USB_CLASS_VIDEO,
2512           .bInterfaceSubClass   = 1,
2513           .bInterfaceProtocol   = 0,
2514           .driver_info          = UVC_QUIRK_PROBE_DEF },
2515         /* The Imaging Source USB CCD cameras */
2516         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2517                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2518           .idVendor             = 0x199e,
2519           .idProduct            = 0x8102,
2520           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2521           .bInterfaceSubClass   = 1,
2522           .bInterfaceProtocol   = 0 },
2523         /* Bodelin ProScopeHR */
2524         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2525                                 | USB_DEVICE_ID_MATCH_DEV_HI
2526                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2527           .idVendor             = 0x19ab,
2528           .idProduct            = 0x1000,
2529           .bcdDevice_hi         = 0x0126,
2530           .bInterfaceClass      = USB_CLASS_VIDEO,
2531           .bInterfaceSubClass   = 1,
2532           .bInterfaceProtocol   = 0,
2533           .driver_info          = UVC_QUIRK_STATUS_INTERVAL },
2534         /* MSI StarCam 370i */
2535         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2536                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2537           .idVendor             = 0x1b3b,
2538           .idProduct            = 0x2951,
2539           .bInterfaceClass      = USB_CLASS_VIDEO,
2540           .bInterfaceSubClass   = 1,
2541           .bInterfaceProtocol   = 0,
2542           .driver_info          = UVC_QUIRK_PROBE_MINMAX },
2543         /* SiGma Micro USB Web Camera */
2544         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2545                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2546           .idVendor             = 0x1c4f,
2547           .idProduct            = 0x3000,
2548           .bInterfaceClass      = USB_CLASS_VIDEO,
2549           .bInterfaceSubClass   = 1,
2550           .bInterfaceProtocol   = 0,
2551           .driver_info          = UVC_QUIRK_PROBE_MINMAX
2552                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT },
2553         /* Oculus VR Positional Tracker DK2 */
2554         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2555                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2556           .idVendor             = 0x2833,
2557           .idProduct            = 0x0201,
2558           .bInterfaceClass      = USB_CLASS_VIDEO,
2559           .bInterfaceSubClass   = 1,
2560           .bInterfaceProtocol   = 0,
2561           .driver_info          = UVC_QUIRK_FORCE_Y8 },
2562         /* Generic USB Video Class */
2563         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
2564         {}
2565 };
2566
2567 MODULE_DEVICE_TABLE(usb, uvc_ids);
2568
2569 struct uvc_driver uvc_driver = {
2570         .driver = {
2571                 .name           = "uvcvideo",
2572                 .probe          = uvc_probe,
2573                 .disconnect     = uvc_disconnect,
2574                 .suspend        = uvc_suspend,
2575                 .resume         = uvc_resume,
2576                 .reset_resume   = uvc_reset_resume,
2577                 .id_table       = uvc_ids,
2578                 .supports_autosuspend = 1,
2579         },
2580 };
2581
2582 static int __init uvc_init(void)
2583 {
2584         int ret;
2585
2586         uvc_debugfs_init();
2587
2588         ret = usb_register(&uvc_driver.driver);
2589         if (ret < 0) {
2590                 uvc_debugfs_cleanup();
2591                 return ret;
2592         }
2593
2594         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
2595         return 0;
2596 }
2597
2598 static void __exit uvc_cleanup(void)
2599 {
2600         usb_deregister(&uvc_driver.driver);
2601         uvc_debugfs_cleanup();
2602 }
2603
2604 module_init(uvc_init);
2605 module_exit(uvc_cleanup);
2606
2607 MODULE_AUTHOR(DRIVER_AUTHOR);
2608 MODULE_DESCRIPTION(DRIVER_DESC);
2609 MODULE_LICENSE("GPL");
2610 MODULE_VERSION(DRIVER_VERSION);
2611