drivers/media/usb/uvc/uvc_driver.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      uvc_driver.c  --  USB Video Class driver
   4  *
   5  *      Copyright (C) 2005-2010
   6  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  */
   8
   9 #include <linux/atomic.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/usb.h>
  15 #include <linux/videodev2.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/wait.h>
  18 #include <linux/version.h>
  19 #include <asm/unaligned.h>
  20
  21 #include <media/v4l2-common.h>
  22 #include <media/v4l2-ioctl.h>
  23
  24 #include "uvcvideo.h"
  25
  26 #define DRIVER_AUTHOR           "Laurent Pinchart " \
  27                                 "<laurent.pinchart@ideasonboard.com>"
  28 #define DRIVER_DESC             "USB Video Class driver"
  29
  30 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
  31 unsigned int uvc_hw_timestamps_param;
  32 unsigned int uvc_no_drop_param;
  33 static unsigned int uvc_quirks_param = -1;
  34 unsigned int uvc_trace_param;
  35 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
  36
  37 /* ------------------------------------------------------------------------
  38  * Video formats
  39  */
  40
  41 static struct uvc_format_desc uvc_fmts[] = {
  42         {
  43                 .name           = "YUV 4:2:2 (YUYV)",
  44                 .guid           = UVC_GUID_FORMAT_YUY2,
  45                 .fcc            = V4L2_PIX_FMT_YUYV,
  46         },
  47         {
  48                 .name           = "YUV 4:2:2 (YUYV)",
  49                 .guid           = UVC_GUID_FORMAT_YUY2_ISIGHT,
  50                 .fcc            = V4L2_PIX_FMT_YUYV,
  51         },
  52         {
  53                 .name           = "YUV 4:2:0 (NV12)",
  54                 .guid           = UVC_GUID_FORMAT_NV12,
  55                 .fcc            = V4L2_PIX_FMT_NV12,
  56         },
  57         {
  58                 .name           = "MJPEG",
  59                 .guid           = UVC_GUID_FORMAT_MJPEG,
  60                 .fcc            = V4L2_PIX_FMT_MJPEG,
  61         },
  62         {
  63                 .name           = "YVU 4:2:0 (YV12)",
  64                 .guid           = UVC_GUID_FORMAT_YV12,
  65                 .fcc            = V4L2_PIX_FMT_YVU420,
  66         },
  67         {
  68                 .name           = "YUV 4:2:0 (I420)",
  69                 .guid           = UVC_GUID_FORMAT_I420,
  70                 .fcc            = V4L2_PIX_FMT_YUV420,
  71         },
  72         {
  73                 .name           = "YUV 4:2:0 (M420)",
  74                 .guid           = UVC_GUID_FORMAT_M420,
  75                 .fcc            = V4L2_PIX_FMT_M420,
  76         },
  77         {
  78                 .name           = "YUV 4:2:2 (UYVY)",
  79                 .guid           = UVC_GUID_FORMAT_UYVY,
  80                 .fcc            = V4L2_PIX_FMT_UYVY,
  81         },
  82         {
  83                 .name           = "Greyscale 8-bit (Y800)",
  84                 .guid           = UVC_GUID_FORMAT_Y800,
  85                 .fcc            = V4L2_PIX_FMT_GREY,
  86         },
  87         {
  88                 .name           = "Greyscale 8-bit (Y8  )",
  89                 .guid           = UVC_GUID_FORMAT_Y8,
  90                 .fcc            = V4L2_PIX_FMT_GREY,
  91         },
  92         {
  93                 .name           = "Greyscale 8-bit (D3DFMT_L8)",
  94                 .guid           = UVC_GUID_FORMAT_D3DFMT_L8,
  95                 .fcc            = V4L2_PIX_FMT_GREY,
  96         },
  97         {
  98                 .name           = "IR 8-bit (L8_IR)",
  99                 .guid           = UVC_GUID_FORMAT_KSMEDIA_L8_IR,
 100                 .fcc            = V4L2_PIX_FMT_GREY,
 101         },
 102         {
 103                 .name           = "Greyscale 10-bit (Y10 )",
 104                 .guid           = UVC_GUID_FORMAT_Y10,
 105                 .fcc            = V4L2_PIX_FMT_Y10,
 106         },
 107         {
 108                 .name           = "Greyscale 12-bit (Y12 )",
 109                 .guid           = UVC_GUID_FORMAT_Y12,
 110                 .fcc            = V4L2_PIX_FMT_Y12,
 111         },
 112         {
 113                 .name           = "Greyscale 16-bit (Y16 )",
 114                 .guid           = UVC_GUID_FORMAT_Y16,
 115                 .fcc            = V4L2_PIX_FMT_Y16,
 116         },
 117         {
 118                 .name           = "BGGR Bayer (BY8 )",
 119                 .guid           = UVC_GUID_FORMAT_BY8,
 120                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 121         },
 122         {
 123                 .name           = "BGGR Bayer (BA81)",
 124                 .guid           = UVC_GUID_FORMAT_BA81,
 125                 .fcc            = V4L2_PIX_FMT_SBGGR8,
 126         },
 127         {
 128                 .name           = "GBRG Bayer (GBRG)",
 129                 .guid           = UVC_GUID_FORMAT_GBRG,
 130                 .fcc            = V4L2_PIX_FMT_SGBRG8,
 131         },
 132         {
 133                 .name           = "GRBG Bayer (GRBG)",
 134                 .guid           = UVC_GUID_FORMAT_GRBG,
 135                 .fcc            = V4L2_PIX_FMT_SGRBG8,
 136         },
 137         {
 138                 .name           = "RGGB Bayer (RGGB)",
 139                 .guid           = UVC_GUID_FORMAT_RGGB,
 140                 .fcc            = V4L2_PIX_FMT_SRGGB8,
 141         },
 142         {
 143                 .name           = "RGB565",
 144                 .guid           = UVC_GUID_FORMAT_RGBP,
 145                 .fcc            = V4L2_PIX_FMT_RGB565,
 146         },
 147         {
 148                 .name           = "BGR 8:8:8 (BGR3)",
 149                 .guid           = UVC_GUID_FORMAT_BGR3,
 150                 .fcc            = V4L2_PIX_FMT_BGR24,
 151         },
 152         {
 153                 .name           = "H.264",
 154                 .guid           = UVC_GUID_FORMAT_H264,
 155                 .fcc            = V4L2_PIX_FMT_H264,
 156         },
 157         {
 158                 .name           = "Greyscale 8 L/R (Y8I)",
 159                 .guid           = UVC_GUID_FORMAT_Y8I,
 160                 .fcc            = V4L2_PIX_FMT_Y8I,
 161         },
 162         {
 163                 .name           = "Greyscale 12 L/R (Y12I)",
 164                 .guid           = UVC_GUID_FORMAT_Y12I,
 165                 .fcc            = V4L2_PIX_FMT_Y12I,
 166         },
 167         {
 168                 .name           = "Depth data 16-bit (Z16)",
 169                 .guid           = UVC_GUID_FORMAT_Z16,
 170                 .fcc            = V4L2_PIX_FMT_Z16,
 171         },
 172         {
 173                 .name           = "Bayer 10-bit (SRGGB10P)",
 174                 .guid           = UVC_GUID_FORMAT_RW10,
 175                 .fcc            = V4L2_PIX_FMT_SRGGB10P,
 176         },
 177         {
 178                 .name           = "Bayer 16-bit (SBGGR16)",
 179                 .guid           = UVC_GUID_FORMAT_BG16,
 180                 .fcc            = V4L2_PIX_FMT_SBGGR16,
 181         },
 182         {
 183                 .name           = "Bayer 16-bit (SGBRG16)",
 184                 .guid           = UVC_GUID_FORMAT_GB16,
 185                 .fcc            = V4L2_PIX_FMT_SGBRG16,
 186         },
 187         {
 188                 .name           = "Bayer 16-bit (SRGGB16)",
 189                 .guid           = UVC_GUID_FORMAT_RG16,
 190                 .fcc            = V4L2_PIX_FMT_SRGGB16,
 191         },
 192         {
 193                 .name           = "Bayer 16-bit (SGRBG16)",
 194                 .guid           = UVC_GUID_FORMAT_GR16,
 195                 .fcc            = V4L2_PIX_FMT_SGRBG16,
 196         },
 197         {
 198                 .name           = "Depth data 16-bit (Z16)",
 199                 .guid           = UVC_GUID_FORMAT_INVZ,
 200                 .fcc            = V4L2_PIX_FMT_Z16,
 201         },
 202         {
 203                 .name           = "Greyscale 10-bit (Y10 )",
 204                 .guid           = UVC_GUID_FORMAT_INVI,
 205                 .fcc            = V4L2_PIX_FMT_Y10,
 206         },
 207         {
 208                 .name           = "IR:Depth 26-bit (INZI)",
 209                 .guid           = UVC_GUID_FORMAT_INZI,
 210                 .fcc            = V4L2_PIX_FMT_INZI,
 211         },
 212         {
 213                 .name           = "4-bit Depth Confidence (Packed)",
 214                 .guid           = UVC_GUID_FORMAT_CNF4,
 215                 .fcc            = V4L2_PIX_FMT_CNF4,
 216         },
 217         {
 218                 .name           = "HEVC",
 219                 .guid           = UVC_GUID_FORMAT_HEVC,
 220                 .fcc            = V4L2_PIX_FMT_HEVC,
 221         },
 222 };
 223
 224 /* ------------------------------------------------------------------------
 225  * Utility functions
 226  */
 227
 228 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 229                 u8 epaddr)
 230 {
 231         struct usb_host_endpoint *ep;
 232         unsigned int i;
 233
 234         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 235                 ep = &alts->endpoint[i];
 236                 if (ep->desc.bEndpointAddress == epaddr)
 237                         return ep;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 static struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16])
 244 {
 245         unsigned int len = ARRAY_SIZE(uvc_fmts);
 246         unsigned int i;
 247
 248         for (i = 0; i < len; ++i) {
 249                 if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
 250                         return &uvc_fmts[i];
 251         }
 252
 253         return NULL;
 254 }
 255
 256 static enum v4l2_colorspace uvc_colorspace(const u8 primaries)
 257 {
 258         static const enum v4l2_colorspace colorprimaries[] = {
 259                 V4L2_COLORSPACE_DEFAULT,  /* Unspecified */
 260                 V4L2_COLORSPACE_SRGB,
 261                 V4L2_COLORSPACE_470_SYSTEM_M,
 262                 V4L2_COLORSPACE_470_SYSTEM_BG,
 263                 V4L2_COLORSPACE_SMPTE170M,
 264                 V4L2_COLORSPACE_SMPTE240M,
 265         };
 266
 267         if (primaries < ARRAY_SIZE(colorprimaries))
 268                 return colorprimaries[primaries];
 269
 270         return V4L2_COLORSPACE_DEFAULT;  /* Reserved */
 271 }
 272
 273 static enum v4l2_xfer_func uvc_xfer_func(const u8 transfer_characteristics)
 274 {
 275         /*
 276          * V4L2 does not currently have definitions for all possible values of
 277          * UVC transfer characteristics. If v4l2_xfer_func is extended with new
 278          * values, the mapping below should be updated.
 279          *
 280          * Substitutions are taken from the mapping given for
 281          * V4L2_XFER_FUNC_DEFAULT documented in videodev2.h.
 282          */
 283         static const enum v4l2_xfer_func xfer_funcs[] = {
 284                 V4L2_XFER_FUNC_DEFAULT,    /* Unspecified */
 285                 V4L2_XFER_FUNC_709,
 286                 V4L2_XFER_FUNC_709,        /* Substitution for BT.470-2 M */
 287                 V4L2_XFER_FUNC_709,        /* Substitution for BT.470-2 B, G */
 288                 V4L2_XFER_FUNC_709,        /* Substitution for SMPTE 170M */
 289                 V4L2_XFER_FUNC_SMPTE240M,
 290                 V4L2_XFER_FUNC_NONE,
 291                 V4L2_XFER_FUNC_SRGB,
 292         };
 293
 294         if (transfer_characteristics < ARRAY_SIZE(xfer_funcs))
 295                 return xfer_funcs[transfer_characteristics];
 296
 297         return V4L2_XFER_FUNC_DEFAULT;  /* Reserved */
 298 }
 299
 300 static enum v4l2_ycbcr_encoding uvc_ycbcr_enc(const u8 matrix_coefficients)
 301 {
 302         /*
 303          * V4L2 does not currently have definitions for all possible values of
 304          * UVC matrix coefficients. If v4l2_ycbcr_encoding is extended with new
 305          * values, the mapping below should be updated.
 306          *
 307          * Substitutions are taken from the mapping given for
 308          * V4L2_YCBCR_ENC_DEFAULT documented in videodev2.h.
 309          *
 310          * FCC is assumed to be close enough to 601.
 311          */
 312         static const enum v4l2_ycbcr_encoding ycbcr_encs[] = {
 313                 V4L2_YCBCR_ENC_DEFAULT,  /* Unspecified */
 314                 V4L2_YCBCR_ENC_709,
 315                 V4L2_YCBCR_ENC_601,      /* Substitution for FCC */
 316                 V4L2_YCBCR_ENC_601,      /* Substitution for BT.470-2 B, G */
 317                 V4L2_YCBCR_ENC_601,
 318                 V4L2_YCBCR_ENC_SMPTE240M,
 319         };
 320
 321         if (matrix_coefficients < ARRAY_SIZE(ycbcr_encs))
 322                 return ycbcr_encs[matrix_coefficients];
 323
 324         return V4L2_YCBCR_ENC_DEFAULT;  /* Reserved */
 325 }
 326
 327 /* Simplify a fraction using a simple continued fraction decomposition. The
 328  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
 329  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
 330  * arbitrary parameters to remove non-significative terms from the simple
 331  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
 332  * respectively seems to give nice results.
 333  */
 334 void uvc_simplify_fraction(u32 *numerator, u32 *denominator,
 335                 unsigned int n_terms, unsigned int threshold)
 336 {
 337         u32 *an;
 338         u32 x, y, r;
 339         unsigned int i, n;
 340
 341         an = kmalloc_array(n_terms, sizeof(*an), GFP_KERNEL);
 342         if (an == NULL)
 343                 return;
 344
 345         /* Convert the fraction to a simple continued fraction. See
 346          * https://mathforum.org/dr.math/faq/faq.fractions.html
 347          * Stop if the current term is bigger than or equal to the given
 348          * threshold.
 349          */
 350         x = *numerator;
 351         y = *denominator;
 352
 353         for (n = 0; n < n_terms && y != 0; ++n) {
 354                 an[n] = x / y;
 355                 if (an[n] >= threshold) {
 356                         if (n < 2)
 357                                 n++;
 358                         break;
 359                 }
 360
 361                 r = x - an[n] * y;
 362                 x = y;
 363                 y = r;
 364         }
 365
 366         /* Expand the simple continued fraction back to an integer fraction. */
 367         x = 0;
 368         y = 1;
 369
 370         for (i = n; i > 0; --i) {
 371                 r = y;
 372                 y = an[i-1] * y + x;
 373                 x = r;
 374         }
 375
 376         *numerator = y;
 377         *denominator = x;
 378         kfree(an);
 379 }
 380
 381 /* Convert a fraction to a frame interval in 100ns multiples. The idea here is
 382  * to compute numerator / denominator * 10000000 using 32 bit fixed point
 383  * arithmetic only.
 384  */
 385 u32 uvc_fraction_to_interval(u32 numerator, u32 denominator)
 386 {
 387         u32 multiplier;
 388
 389         /* Saturate the result if the operation would overflow. */
 390         if (denominator == 0 ||
 391             numerator/denominator >= ((u32)-1)/10000000)
 392                 return (u32)-1;
 393
 394         /* Divide both the denominator and the multiplier by two until
 395          * numerator * multiplier doesn't overflow. If anyone knows a better
 396          * algorithm please let me know.
 397          */
 398         multiplier = 10000000;
 399         while (numerator > ((u32)-1)/multiplier) {
 400                 multiplier /= 2;
 401                 denominator /= 2;
 402         }
 403
 404         return denominator ? numerator * multiplier / denominator : 0;
 405 }
 406
 407 /* ------------------------------------------------------------------------
 408  * Terminal and unit management
 409  */
 410
 411 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 412 {
 413         struct uvc_entity *entity;
 414
 415         list_for_each_entry(entity, &dev->entities, list) {
 416                 if (entity->id == id)
 417                         return entity;
 418         }
 419
 420         return NULL;
 421 }
 422
 423 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
 424         int id, struct uvc_entity *entity)
 425 {
 426         unsigned int i;
 427
 428         if (entity == NULL)
 429                 entity = list_entry(&dev->entities, struct uvc_entity, list);
 430
 431         list_for_each_entry_continue(entity, &dev->entities, list) {
 432                 for (i = 0; i < entity->bNrInPins; ++i)
 433                         if (entity->baSourceID[i] == id)
 434                                 return entity;
 435         }
 436
 437         return NULL;
 438 }
 439
 440 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 441 {
 442         struct uvc_streaming *stream;
 443
 444         list_for_each_entry(stream, &dev->streams, list) {
 445                 if (stream->header.bTerminalLink == id)
 446                         return stream;
 447         }
 448
 449         return NULL;
 450 }
 451
 452 /* ------------------------------------------------------------------------
 453  * Streaming Object Management
 454  */
 455
 456 static void uvc_stream_delete(struct uvc_streaming *stream)
 457 {
 458         if (stream->async_wq)
 459                 destroy_workqueue(stream->async_wq);
 460
 461         mutex_destroy(&stream->mutex);
 462
 463         usb_put_intf(stream->intf);
 464
 465         kfree(stream->format);
 466         kfree(stream->header.bmaControls);
 467         kfree(stream);
 468 }
 469
 470 static struct uvc_streaming *uvc_stream_new(struct uvc_device *dev,
 471                                             struct usb_interface *intf)
 472 {
 473         struct uvc_streaming *stream;
 474
 475         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 476         if (stream == NULL)
 477                 return NULL;
 478
 479         mutex_init(&stream->mutex);
 480
 481         stream->dev = dev;
 482         stream->intf = usb_get_intf(intf);
 483         stream->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 484
 485         /* Allocate a stream specific work queue for asynchronous tasks. */
 486         stream->async_wq = alloc_workqueue("uvcvideo", WQ_UNBOUND | WQ_HIGHPRI,
 487                                            0);
 488         if (!stream->async_wq) {
 489                 uvc_stream_delete(stream);
 490                 return NULL;
 491         }
 492
 493         return stream;
 494 }
 495
 496 /* ------------------------------------------------------------------------
 497  * Descriptors parsing
 498  */
 499
 500 static int uvc_parse_format(struct uvc_device *dev,
 501         struct uvc_streaming *streaming, struct uvc_format *format,
 502         u32 **intervals, unsigned char *buffer, int buflen)
 503 {
 504         struct usb_interface *intf = streaming->intf;
 505         struct usb_host_interface *alts = intf->cur_altsetting;
 506         struct uvc_format_desc *fmtdesc;
 507         struct uvc_frame *frame;
 508         const unsigned char *start = buffer;
 509         unsigned int width_multiplier = 1;
 510         unsigned int interval;
 511         unsigned int i, n;
 512         u8 ftype;
 513
 514         format->type = buffer[2];
 515         format->index = buffer[3];
 516
 517         switch (buffer[2]) {
 518         case UVC_VS_FORMAT_UNCOMPRESSED:
 519         case UVC_VS_FORMAT_FRAME_BASED:
 520                 n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
 521                 if (buflen < n) {
 522                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 523                                "interface %d FORMAT error\n",
 524                                dev->udev->devnum,
 525                                alts->desc.bInterfaceNumber);
 526                         return -EINVAL;
 527                 }
 528
 529                 /* Find the format descriptor from its GUID. */
 530                 fmtdesc = uvc_format_by_guid(&buffer[5]);
 531
 532                 if (fmtdesc != NULL) {
 533                         strscpy(format->name, fmtdesc->name,
 534                                 sizeof(format->name));
 535                         format->fcc = fmtdesc->fcc;
 536                 } else {
 537                         uvc_printk(KERN_INFO, "Unknown video format %pUl\n",
 538                                 &buffer[5]);
 539                         snprintf(format->name, sizeof(format->name), "%pUl\n",
 540                                 &buffer[5]);
 541                         format->fcc = 0;
 542                 }
 543
 544                 format->bpp = buffer[21];
 545
 546                 /* Some devices report a format that doesn't match what they
 547                  * really send.
 548                  */
 549                 if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
 550                         if (format->fcc == V4L2_PIX_FMT_YUYV) {
 551                                 strscpy(format->name, "Greyscale 8-bit (Y8  )",
 552                                         sizeof(format->name));
 553                                 format->fcc = V4L2_PIX_FMT_GREY;
 554                                 format->bpp = 8;
 555                                 width_multiplier = 2;
 556                         }
 557                 }
 558
 559                 /* Some devices report bpp that doesn't match the format. */
 560                 if (dev->quirks & UVC_QUIRK_FORCE_BPP) {
 561                         const struct v4l2_format_info *info =
 562                                 v4l2_format_info(format->fcc);
 563
 564                         if (info) {
 565                                 unsigned int div = info->hdiv * info->vdiv;
 566
 567                                 n = info->bpp[0] * div;
 568                                 for (i = 1; i < info->comp_planes; i++)
 569                                         n += info->bpp[i];
 570
 571                                 format->bpp = DIV_ROUND_UP(8 * n, div);
 572                         }
 573                 }
 574
 575                 if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
 576                         ftype = UVC_VS_FRAME_UNCOMPRESSED;
 577                 } else {
 578                         ftype = UVC_VS_FRAME_FRAME_BASED;
 579                         if (buffer[27])
 580                                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 581                 }
 582                 break;
 583
 584         case UVC_VS_FORMAT_MJPEG:
 585                 if (buflen < 11) {
 586                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 587                                "interface %d FORMAT error\n",
 588                                dev->udev->devnum,
 589                                alts->desc.bInterfaceNumber);
 590                         return -EINVAL;
 591                 }
 592
 593                 strscpy(format->name, "MJPEG", sizeof(format->name));
 594                 format->fcc = V4L2_PIX_FMT_MJPEG;
 595                 format->flags = UVC_FMT_FLAG_COMPRESSED;
 596                 format->bpp = 0;
 597                 ftype = UVC_VS_FRAME_MJPEG;
 598                 break;
 599
 600         case UVC_VS_FORMAT_DV:
 601                 if (buflen < 9) {
 602                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 603                                "interface %d FORMAT error\n",
 604                                dev->udev->devnum,
 605                                alts->desc.bInterfaceNumber);
 606                         return -EINVAL;
 607                 }
 608
 609                 switch (buffer[8] & 0x7f) {
 610                 case 0:
 611                         strscpy(format->name, "SD-DV", sizeof(format->name));
 612                         break;
 613                 case 1:
 614                         strscpy(format->name, "SDL-DV", sizeof(format->name));
 615                         break;
 616                 case 2:
 617                         strscpy(format->name, "HD-DV", sizeof(format->name));
 618                         break;
 619                 default:
 620                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 621                                "interface %d: unknown DV format %u\n",
 622                                dev->udev->devnum,
 623                                alts->desc.bInterfaceNumber, buffer[8]);
 624                         return -EINVAL;
 625                 }
 626
 627                 strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 628                         sizeof(format->name));
 629
 630                 format->fcc = V4L2_PIX_FMT_DV;
 631                 format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
 632                 format->bpp = 0;
 633                 ftype = 0;
 634
 635                 /* Create a dummy frame descriptor. */
 636                 frame = &format->frame[0];
 637                 memset(&format->frame[0], 0, sizeof(format->frame[0]));
 638                 frame->bFrameIntervalType = 1;
 639                 frame->dwDefaultFrameInterval = 1;
 640                 frame->dwFrameInterval = *intervals;
 641                 *(*intervals)++ = 1;
 642                 format->nframes = 1;
 643                 break;
 644
 645         case UVC_VS_FORMAT_MPEG2TS:
 646         case UVC_VS_FORMAT_STREAM_BASED:
 647                 /* Not supported yet. */
 648         default:
 649                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 650                        "interface %d unsupported format %u\n",
 651                        dev->udev->devnum, alts->desc.bInterfaceNumber,
 652                        buffer[2]);
 653                 return -EINVAL;
 654         }
 655
 656         uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
 657
 658         buflen -= buffer[0];
 659         buffer += buffer[0];
 660
 661         /* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 662          * based formats have frame descriptors.
 663          */
 664         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 665                buffer[2] == ftype) {
 666                 frame = &format->frame[format->nframes];
 667                 if (ftype != UVC_VS_FRAME_FRAME_BASED)
 668                         n = buflen > 25 ? buffer[25] : 0;
 669                 else
 670                         n = buflen > 21 ? buffer[21] : 0;
 671
 672                 n = n ? n : 3;
 673
 674                 if (buflen < 26 + 4*n) {
 675                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 676                                "interface %d FRAME error\n", dev->udev->devnum,
 677                                alts->desc.bInterfaceNumber);
 678                         return -EINVAL;
 679                 }
 680
 681                 frame->bFrameIndex = buffer[3];
 682                 frame->bmCapabilities = buffer[4];
 683                 frame->wWidth = get_unaligned_le16(&buffer[5])
 684                               * width_multiplier;
 685                 frame->wHeight = get_unaligned_le16(&buffer[7]);
 686                 frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
 687                 frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
 688                 if (ftype != UVC_VS_FRAME_FRAME_BASED) {
 689                         frame->dwMaxVideoFrameBufferSize =
 690                                 get_unaligned_le32(&buffer[17]);
 691                         frame->dwDefaultFrameInterval =
 692                                 get_unaligned_le32(&buffer[21]);
 693                         frame->bFrameIntervalType = buffer[25];
 694                 } else {
 695                         frame->dwMaxVideoFrameBufferSize = 0;
 696                         frame->dwDefaultFrameInterval =
 697                                 get_unaligned_le32(&buffer[17]);
 698                         frame->bFrameIntervalType = buffer[21];
 699                 }
 700                 frame->dwFrameInterval = *intervals;
 701
 702                 /* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
 703                  * completely. Observed behaviours range from setting the
 704                  * value to 1.1x the actual frame size to hardwiring the
 705                  * 16 low bits to 0. This results in a higher than necessary
 706                  * memory usage as well as a wrong image size information. For
 707                  * uncompressed formats this can be fixed by computing the
 708                  * value from the frame size.
 709                  */
 710                 if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
 711                         frame->dwMaxVideoFrameBufferSize = format->bpp
 712                                 * frame->wWidth * frame->wHeight / 8;
 713
 714                 /* Some bogus devices report dwMinFrameInterval equal to
 715                  * dwMaxFrameInterval and have dwFrameIntervalStep set to
 716                  * zero. Setting all null intervals to 1 fixes the problem and
 717                  * some other divisions by zero that could happen.
 718                  */
 719                 for (i = 0; i < n; ++i) {
 720                         interval = get_unaligned_le32(&buffer[26+4*i]);
 721                         *(*intervals)++ = interval ? interval : 1;
 722                 }
 723
 724                 /* Make sure that the default frame interval stays between
 725                  * the boundaries.
 726                  */
 727                 n -= frame->bFrameIntervalType ? 1 : 2;
 728                 frame->dwDefaultFrameInterval =
 729                         min(frame->dwFrameInterval[n],
 730                             max(frame->dwFrameInterval[0],
 731                                 frame->dwDefaultFrameInterval));
 732
 733                 if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
 734                         frame->bFrameIntervalType = 1;
 735                         frame->dwFrameInterval[0] =
 736                                 frame->dwDefaultFrameInterval;
 737                 }
 738
 739                 uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
 740                         frame->wWidth, frame->wHeight,
 741                         10000000/frame->dwDefaultFrameInterval,
 742                         (100000000/frame->dwDefaultFrameInterval)%10);
 743
 744                 format->nframes++;
 745                 buflen -= buffer[0];
 746                 buffer += buffer[0];
 747         }
 748
 749         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 750             buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
 751                 buflen -= buffer[0];
 752                 buffer += buffer[0];
 753         }
 754
 755         if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 756             buffer[2] == UVC_VS_COLORFORMAT) {
 757                 if (buflen < 6) {
 758                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 759                                "interface %d COLORFORMAT error\n",
 760                                dev->udev->devnum,
 761                                alts->desc.bInterfaceNumber);
 762                         return -EINVAL;
 763                 }
 764
 765                 format->colorspace = uvc_colorspace(buffer[3]);
 766                 format->xfer_func = uvc_xfer_func(buffer[4]);
 767                 format->ycbcr_enc = uvc_ycbcr_enc(buffer[5]);
 768
 769                 buflen -= buffer[0];
 770                 buffer += buffer[0];
 771         }
 772
 773         return buffer - start;
 774 }
 775
 776 static int uvc_parse_streaming(struct uvc_device *dev,
 777         struct usb_interface *intf)
 778 {
 779         struct uvc_streaming *streaming = NULL;
 780         struct uvc_format *format;
 781         struct uvc_frame *frame;
 782         struct usb_host_interface *alts = &intf->altsetting[0];
 783         unsigned char *_buffer, *buffer = alts->extra;
 784         int _buflen, buflen = alts->extralen;
 785         unsigned int nformats = 0, nframes = 0, nintervals = 0;
 786         unsigned int size, i, n, p;
 787         u32 *interval;
 788         u16 psize;
 789         int ret = -EINVAL;
 790
 791         if (intf->cur_altsetting->desc.bInterfaceSubClass
 792                 != UVC_SC_VIDEOSTREAMING) {
 793                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
 794                         "video streaming interface\n", dev->udev->devnum,
 795                         intf->altsetting[0].desc.bInterfaceNumber);
 796                 return -EINVAL;
 797         }
 798
 799         if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
 800                 uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
 801                         "claimed\n", dev->udev->devnum,
 802                         intf->altsetting[0].desc.bInterfaceNumber);
 803                 return -EINVAL;
 804         }
 805
 806         streaming = uvc_stream_new(dev, intf);
 807         if (streaming == NULL) {
 808                 usb_driver_release_interface(&uvc_driver.driver, intf);
 809                 return -ENOMEM;
 810         }
 811
 812         /* The Pico iMage webcam has its class-specific interface descriptors
 813          * after the endpoint descriptors.
 814          */
 815         if (buflen == 0) {
 816                 for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
 817                         struct usb_host_endpoint *ep = &alts->endpoint[i];
 818
 819                         if (ep->extralen == 0)
 820                                 continue;
 821
 822                         if (ep->extralen > 2 &&
 823                             ep->extra[1] == USB_DT_CS_INTERFACE) {
 824                                 uvc_trace(UVC_TRACE_DESCR, "trying extra data "
 825                                         "from endpoint %u.\n", i);
 826                                 buffer = alts->endpoint[i].extra;
 827                                 buflen = alts->endpoint[i].extralen;
 828                                 break;
 829                         }
 830                 }
 831         }
 832
 833         /* Skip the standard interface descriptors. */
 834         while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
 835                 buflen -= buffer[0];
 836                 buffer += buffer[0];
 837         }
 838
 839         if (buflen <= 2) {
 840                 uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
 841                         "interface descriptors found.\n");
 842                 goto error;
 843         }
 844
 845         /* Parse the header descriptor. */
 846         switch (buffer[2]) {
 847         case UVC_VS_OUTPUT_HEADER:
 848                 streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 849                 size = 9;
 850                 break;
 851
 852         case UVC_VS_INPUT_HEADER:
 853                 streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 854                 size = 13;
 855                 break;
 856
 857         default:
 858                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 859                         "%d HEADER descriptor not found.\n", dev->udev->devnum,
 860                         alts->desc.bInterfaceNumber);
 861                 goto error;
 862         }
 863
 864         p = buflen >= 4 ? buffer[3] : 0;
 865         n = buflen >= size ? buffer[size-1] : 0;
 866
 867         if (buflen < size + p*n) {
 868                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 869                         "interface %d HEADER descriptor is invalid.\n",
 870                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 871                 goto error;
 872         }
 873
 874         streaming->header.bNumFormats = p;
 875         streaming->header.bEndpointAddress = buffer[6];
 876         if (buffer[2] == UVC_VS_INPUT_HEADER) {
 877                 streaming->header.bmInfo = buffer[7];
 878                 streaming->header.bTerminalLink = buffer[8];
 879                 streaming->header.bStillCaptureMethod = buffer[9];
 880                 streaming->header.bTriggerSupport = buffer[10];
 881                 streaming->header.bTriggerUsage = buffer[11];
 882         } else {
 883                 streaming->header.bTerminalLink = buffer[7];
 884         }
 885         streaming->header.bControlSize = n;
 886
 887         streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
 888                                                 GFP_KERNEL);
 889         if (streaming->header.bmaControls == NULL) {
 890                 ret = -ENOMEM;
 891                 goto error;
 892         }
 893
 894         buflen -= buffer[0];
 895         buffer += buffer[0];
 896
 897         _buffer = buffer;
 898         _buflen = buflen;
 899
 900         /* Count the format and frame descriptors. */
 901         while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
 902                 switch (_buffer[2]) {
 903                 case UVC_VS_FORMAT_UNCOMPRESSED:
 904                 case UVC_VS_FORMAT_MJPEG:
 905                 case UVC_VS_FORMAT_FRAME_BASED:
 906                         nformats++;
 907                         break;
 908
 909                 case UVC_VS_FORMAT_DV:
 910                         /* DV format has no frame descriptor. We will create a
 911                          * dummy frame descriptor with a dummy frame interval.
 912                          */
 913                         nformats++;
 914                         nframes++;
 915                         nintervals++;
 916                         break;
 917
 918                 case UVC_VS_FORMAT_MPEG2TS:
 919                 case UVC_VS_FORMAT_STREAM_BASED:
 920                         uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
 921                                 "interface %d FORMAT %u is not supported.\n",
 922                                 dev->udev->devnum,
 923                                 alts->desc.bInterfaceNumber, _buffer[2]);
 924                         break;
 925
 926                 case UVC_VS_FRAME_UNCOMPRESSED:
 927                 case UVC_VS_FRAME_MJPEG:
 928                         nframes++;
 929                         if (_buflen > 25)
 930                                 nintervals += _buffer[25] ? _buffer[25] : 3;
 931                         break;
 932
 933                 case UVC_VS_FRAME_FRAME_BASED:
 934                         nframes++;
 935                         if (_buflen > 21)
 936                                 nintervals += _buffer[21] ? _buffer[21] : 3;
 937                         break;
 938                 }
 939
 940                 _buflen -= _buffer[0];
 941                 _buffer += _buffer[0];
 942         }
 943
 944         if (nformats == 0) {
 945                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 946                         "%d has no supported formats defined.\n",
 947                         dev->udev->devnum, alts->desc.bInterfaceNumber);
 948                 goto error;
 949         }
 950
 951         size = nformats * sizeof(*format) + nframes * sizeof(*frame)
 952              + nintervals * sizeof(*interval);
 953         format = kzalloc(size, GFP_KERNEL);
 954         if (format == NULL) {
 955                 ret = -ENOMEM;
 956                 goto error;
 957         }
 958
 959         frame = (struct uvc_frame *)&format[nformats];
 960         interval = (u32 *)&frame[nframes];
 961
 962         streaming->format = format;
 963         streaming->nformats = nformats;
 964
 965         /* Parse the format descriptors. */
 966         while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
 967                 switch (buffer[2]) {
 968                 case UVC_VS_FORMAT_UNCOMPRESSED:
 969                 case UVC_VS_FORMAT_MJPEG:
 970                 case UVC_VS_FORMAT_DV:
 971                 case UVC_VS_FORMAT_FRAME_BASED:
 972                         format->frame = frame;
 973                         ret = uvc_parse_format(dev, streaming, format,
 974                                 &interval, buffer, buflen);
 975                         if (ret < 0)
 976                                 goto error;
 977
 978                         frame += format->nframes;
 979                         format++;
 980
 981                         buflen -= ret;
 982                         buffer += ret;
 983                         continue;
 984
 985                 default:
 986                         break;
 987                 }
 988
 989                 buflen -= buffer[0];
 990                 buffer += buffer[0];
 991         }
 992
 993         if (buflen)
 994                 uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
 995                         "%d has %u bytes of trailing descriptor garbage.\n",
 996                         dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 997
 998         /* Parse the alternate settings to find the maximum bandwidth. */
 999         for (i = 0; i < intf->num_altsetting; ++i) {
1000                 struct usb_host_endpoint *ep;
1001                 alts = &intf->altsetting[i];
1002                 ep = uvc_find_endpoint(alts,
1003                                 streaming->header.bEndpointAddress);
1004                 if (ep == NULL)
1005                         continue;
1006
1007                 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
1008                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
1009                 if (psize > streaming->maxpsize)
1010                         streaming->maxpsize = psize;
1011         }
1012
1013         list_add_tail(&streaming->list, &dev->streams);
1014         return 0;
1015
1016 error:
1017         usb_driver_release_interface(&uvc_driver.driver, intf);
1018         uvc_stream_delete(streaming);
1019         return ret;
1020 }
1021
1022 static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
1023                 unsigned int num_pads, unsigned int extra_size)
1024 {
1025         struct uvc_entity *entity;
1026         unsigned int num_inputs;
1027         unsigned int size;
1028         unsigned int i;
1029
1030         extra_size = roundup(extra_size, sizeof(*entity->pads));
1031         if (num_pads)
1032                 num_inputs = type & UVC_TERM_OUTPUT ? num_pads : num_pads - 1;
1033         else
1034                 num_inputs = 0;
1035         size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
1036              + num_inputs;
1037         entity = kzalloc(size, GFP_KERNEL);
1038         if (entity == NULL)
1039                 return NULL;
1040
1041         entity->id = id;
1042         entity->type = type;
1043
1044         entity->num_links = 0;
1045         entity->num_pads = num_pads;
1046         entity->pads = ((void *)(entity + 1)) + extra_size;
1047
1048         for (i = 0; i < num_inputs; ++i)
1049                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
1050         if (!UVC_ENTITY_IS_OTERM(entity) && num_pads)
1051                 entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
1052
1053         entity->bNrInPins = num_inputs;
1054         entity->baSourceID = (u8 *)(&entity->pads[num_pads]);
1055
1056         return entity;
1057 }
1058
1059 /* Parse vendor-specific extensions. */
1060 static int uvc_parse_vendor_control(struct uvc_device *dev,
1061         const unsigned char *buffer, int buflen)
1062 {
1063         struct usb_device *udev = dev->udev;
1064         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1065         struct uvc_entity *unit;
1066         unsigned int n, p;
1067         int handled = 0;
1068
1069         switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
1070         case 0x046d:            /* Logitech */
1071                 if (buffer[1] != 0x41 || buffer[2] != 0x01)
1072                         break;
1073
1074                 /* Logitech implements several vendor specific functions
1075                  * through vendor specific extension units (LXU).
1076                  *
1077                  * The LXU descriptors are similar to XU descriptors
1078                  * (see "USB Device Video Class for Video Devices", section
1079                  * 3.7.2.6 "Extension Unit Descriptor") with the following
1080                  * differences:
1081                  *
1082                  * ----------------------------------------------------------
1083                  * 0            bLength         1        Number
1084                  *      Size of this descriptor, in bytes: 24+p+n*2
1085                  * ----------------------------------------------------------
1086                  * 23+p+n       bmControlsType  N       Bitmap
1087                  *      Individual bits in the set are defined:
1088                  *      0: Absolute
1089                  *      1: Relative
1090                  *
1091                  *      This bitset is mapped exactly the same as bmControls.
1092                  * ----------------------------------------------------------
1093                  * 23+p+n*2     bReserved       1       Boolean
1094                  * ----------------------------------------------------------
1095                  * 24+p+n*2     iExtension      1       Index
1096                  *      Index of a string descriptor that describes this
1097                  *      extension unit.
1098                  * ----------------------------------------------------------
1099                  */
1100                 p = buflen >= 22 ? buffer[21] : 0;
1101                 n = buflen >= 25 + p ? buffer[22+p] : 0;
1102
1103                 if (buflen < 25 + p + 2*n) {
1104                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1105                                 "interface %d EXTENSION_UNIT error\n",
1106                                 udev->devnum, alts->desc.bInterfaceNumber);
1107                         break;
1108                 }
1109
1110                 unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
1111                                         p + 1, 2*n);
1112                 if (unit == NULL)
1113                         return -ENOMEM;
1114
1115                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1116                 unit->extension.bNumControls = buffer[20];
1117                 memcpy(unit->baSourceID, &buffer[22], p);
1118                 unit->extension.bControlSize = buffer[22+p];
1119                 unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
1120                 unit->extension.bmControlsType = (u8 *)unit + sizeof(*unit)
1121                                                + n;
1122                 memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
1123
1124                 if (buffer[24+p+2*n] == 0 ||
1125                     usb_string(udev, buffer[24+p+2*n], unit->name, sizeof(unit->name)) < 0)
1126                         sprintf(unit->name, "Extension %u", buffer[3]);
1127
1128                 list_add_tail(&unit->list, &dev->entities);
1129                 handled = 1;
1130                 break;
1131         }
1132
1133         return handled;
1134 }
1135
1136 static int uvc_parse_standard_control(struct uvc_device *dev,
1137         const unsigned char *buffer, int buflen)
1138 {
1139         struct usb_device *udev = dev->udev;
1140         struct uvc_entity *unit, *term;
1141         struct usb_interface *intf;
1142         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1143         unsigned int i, n, p, len;
1144         u16 type;
1145
1146         switch (buffer[2]) {
1147         case UVC_VC_HEADER:
1148                 n = buflen >= 12 ? buffer[11] : 0;
1149
1150                 if (buflen < 12 + n) {
1151                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1152                                 "interface %d HEADER error\n", udev->devnum,
1153                                 alts->desc.bInterfaceNumber);
1154                         return -EINVAL;
1155                 }
1156
1157                 dev->uvc_version = get_unaligned_le16(&buffer[3]);
1158                 dev->clock_frequency = get_unaligned_le32(&buffer[7]);
1159
1160                 /* Parse all USB Video Streaming interfaces. */
1161                 for (i = 0; i < n; ++i) {
1162                         intf = usb_ifnum_to_if(udev, buffer[12+i]);
1163                         if (intf == NULL) {
1164                                 uvc_trace(UVC_TRACE_DESCR, "device %d "
1165                                         "interface %d doesn't exists\n",
1166                                         udev->devnum, i);
1167                                 continue;
1168                         }
1169
1170                         uvc_parse_streaming(dev, intf);
1171                 }
1172                 break;
1173
1174         case UVC_VC_INPUT_TERMINAL:
1175                 if (buflen < 8) {
1176                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1177                                 "interface %d INPUT_TERMINAL error\n",
1178                                 udev->devnum, alts->desc.bInterfaceNumber);
1179                         return -EINVAL;
1180                 }
1181
1182                 /*
1183                  * Reject invalid terminal types that would cause issues:
1184                  *
1185                  * - The high byte must be non-zero, otherwise it would be
1186                  *   confused with a unit.
1187                  *
1188                  * - Bit 15 must be 0, as we use it internally as a terminal
1189                  *   direction flag.
1190                  *
1191                  * Other unknown types are accepted.
1192                  */
1193                 type = get_unaligned_le16(&buffer[4]);
1194                 if ((type & 0x7f00) == 0 || (type & 0x8000) != 0) {
1195                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1196                                 "interface %d INPUT_TERMINAL %d has invalid "
1197                                 "type 0x%04x, skipping\n", udev->devnum,
1198                                 alts->desc.bInterfaceNumber,
1199                                 buffer[3], type);
1200                         return 0;
1201                 }
1202
1203                 n = 0;
1204                 p = 0;
1205                 len = 8;
1206
1207                 if (type == UVC_ITT_CAMERA) {
1208                         n = buflen >= 15 ? buffer[14] : 0;
1209                         len = 15;
1210
1211                 } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1212                         n = buflen >= 9 ? buffer[8] : 0;
1213                         p = buflen >= 10 + n ? buffer[9+n] : 0;
1214                         len = 10;
1215                 }
1216
1217                 if (buflen < len + n + p) {
1218                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1219                                 "interface %d INPUT_TERMINAL error\n",
1220                                 udev->devnum, alts->desc.bInterfaceNumber);
1221                         return -EINVAL;
1222                 }
1223
1224                 term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
1225                                         1, n + p);
1226                 if (term == NULL)
1227                         return -ENOMEM;
1228
1229                 if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
1230                         term->camera.bControlSize = n;
1231                         term->camera.bmControls = (u8 *)term + sizeof(*term);
1232                         term->camera.wObjectiveFocalLengthMin =
1233                                 get_unaligned_le16(&buffer[8]);
1234                         term->camera.wObjectiveFocalLengthMax =
1235                                 get_unaligned_le16(&buffer[10]);
1236                         term->camera.wOcularFocalLength =
1237                                 get_unaligned_le16(&buffer[12]);
1238                         memcpy(term->camera.bmControls, &buffer[15], n);
1239                 } else if (UVC_ENTITY_TYPE(term) ==
1240                            UVC_ITT_MEDIA_TRANSPORT_INPUT) {
1241                         term->media.bControlSize = n;
1242                         term->media.bmControls = (u8 *)term + sizeof(*term);
1243                         term->media.bTransportModeSize = p;
1244                         term->media.bmTransportModes = (u8 *)term
1245                                                      + sizeof(*term) + n;
1246                         memcpy(term->media.bmControls, &buffer[9], n);
1247                         memcpy(term->media.bmTransportModes, &buffer[10+n], p);
1248                 }
1249
1250                 if (buffer[7] == 0 ||
1251                     usb_string(udev, buffer[7], term->name, sizeof(term->name)) < 0) {
1252                         if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
1253                                 sprintf(term->name, "Camera %u", buffer[3]);
1254                         if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
1255                                 sprintf(term->name, "Media %u", buffer[3]);
1256                         else
1257                                 sprintf(term->name, "Input %u", buffer[3]);
1258                 }
1259
1260                 list_add_tail(&term->list, &dev->entities);
1261                 break;
1262
1263         case UVC_VC_OUTPUT_TERMINAL:
1264                 if (buflen < 9) {
1265                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1266                                 "interface %d OUTPUT_TERMINAL error\n",
1267                                 udev->devnum, alts->desc.bInterfaceNumber);
1268                         return -EINVAL;
1269                 }
1270
1271                 /* Make sure the terminal type MSB is not null, otherwise it
1272                  * could be confused with a unit.
1273                  */
1274                 type = get_unaligned_le16(&buffer[4]);
1275                 if ((type & 0xff00) == 0) {
1276                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1277                                 "interface %d OUTPUT_TERMINAL %d has invalid "
1278                                 "type 0x%04x, skipping\n", udev->devnum,
1279                                 alts->desc.bInterfaceNumber, buffer[3], type);
1280                         return 0;
1281                 }
1282
1283                 term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
1284                                         1, 0);
1285                 if (term == NULL)
1286                         return -ENOMEM;
1287
1288                 memcpy(term->baSourceID, &buffer[7], 1);
1289
1290                 if (buffer[8] == 0 ||
1291                     usb_string(udev, buffer[8], term->name, sizeof(term->name)) < 0)
1292                         sprintf(term->name, "Output %u", buffer[3]);
1293
1294                 list_add_tail(&term->list, &dev->entities);
1295                 break;
1296
1297         case UVC_VC_SELECTOR_UNIT:
1298                 p = buflen >= 5 ? buffer[4] : 0;
1299
1300                 if (buflen < 5 || buflen < 6 + p) {
1301                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1302                                 "interface %d SELECTOR_UNIT error\n",
1303                                 udev->devnum, alts->desc.bInterfaceNumber);
1304                         return -EINVAL;
1305                 }
1306
1307                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
1308                 if (unit == NULL)
1309                         return -ENOMEM;
1310
1311                 memcpy(unit->baSourceID, &buffer[5], p);
1312
1313                 if (buffer[5+p] == 0 ||
1314                     usb_string(udev, buffer[5+p], unit->name, sizeof(unit->name)) < 0)
1315                         sprintf(unit->name, "Selector %u", buffer[3]);
1316
1317                 list_add_tail(&unit->list, &dev->entities);
1318                 break;
1319
1320         case UVC_VC_PROCESSING_UNIT:
1321                 n = buflen >= 8 ? buffer[7] : 0;
1322                 p = dev->uvc_version >= 0x0110 ? 10 : 9;
1323
1324                 if (buflen < p + n) {
1325                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1326                                 "interface %d PROCESSING_UNIT error\n",
1327                                 udev->devnum, alts->desc.bInterfaceNumber);
1328                         return -EINVAL;
1329                 }
1330
1331                 unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
1332                 if (unit == NULL)
1333                         return -ENOMEM;
1334
1335                 memcpy(unit->baSourceID, &buffer[4], 1);
1336                 unit->processing.wMaxMultiplier =
1337                         get_unaligned_le16(&buffer[5]);
1338                 unit->processing.bControlSize = buffer[7];
1339                 unit->processing.bmControls = (u8 *)unit + sizeof(*unit);
1340                 memcpy(unit->processing.bmControls, &buffer[8], n);
1341                 if (dev->uvc_version >= 0x0110)
1342                         unit->processing.bmVideoStandards = buffer[9+n];
1343
1344                 if (buffer[8+n] == 0 ||
1345                     usb_string(udev, buffer[8+n], unit->name, sizeof(unit->name)) < 0)
1346                         sprintf(unit->name, "Processing %u", buffer[3]);
1347
1348                 list_add_tail(&unit->list, &dev->entities);
1349                 break;
1350
1351         case UVC_VC_EXTENSION_UNIT:
1352                 p = buflen >= 22 ? buffer[21] : 0;
1353                 n = buflen >= 24 + p ? buffer[22+p] : 0;
1354
1355                 if (buflen < 24 + p + n) {
1356                         uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
1357                                 "interface %d EXTENSION_UNIT error\n",
1358                                 udev->devnum, alts->desc.bInterfaceNumber);
1359                         return -EINVAL;
1360                 }
1361
1362                 unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
1363                 if (unit == NULL)
1364                         return -ENOMEM;
1365
1366                 memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
1367                 unit->extension.bNumControls = buffer[20];
1368                 memcpy(unit->baSourceID, &buffer[22], p);
1369                 unit->extension.bControlSize = buffer[22+p];
1370                 unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
1371                 memcpy(unit->extension.bmControls, &buffer[23+p], n);
1372
1373                 if (buffer[23+p+n] == 0 ||
1374                     usb_string(udev, buffer[23+p+n], unit->name, sizeof(unit->name)) < 0)
1375                         sprintf(unit->name, "Extension %u", buffer[3]);
1376
1377                 list_add_tail(&unit->list, &dev->entities);
1378                 break;
1379
1380         default:
1381                 uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
1382                         "descriptor (%u)\n", buffer[2]);
1383                 break;
1384         }
1385
1386         return 0;
1387 }
1388
1389 static int uvc_parse_control(struct uvc_device *dev)
1390 {
1391         struct usb_host_interface *alts = dev->intf->cur_altsetting;
1392         unsigned char *buffer = alts->extra;
1393         int buflen = alts->extralen;
1394         int ret;
1395
1396         /* Parse the default alternate setting only, as the UVC specification
1397          * defines a single alternate setting, the default alternate setting
1398          * zero.
1399          */
1400
1401         while (buflen > 2) {
1402                 if (uvc_parse_vendor_control(dev, buffer, buflen) ||
1403                     buffer[1] != USB_DT_CS_INTERFACE)
1404                         goto next_descriptor;
1405
1406                 if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
1407                         return ret;
1408
1409 next_descriptor:
1410                 buflen -= buffer[0];
1411                 buffer += buffer[0];
1412         }
1413
1414         /* Check if the optional status endpoint is present. Built-in iSight
1415          * webcams have an interrupt endpoint but spit proprietary data that
1416          * don't conform to the UVC status endpoint messages. Don't try to
1417          * handle the interrupt endpoint for those cameras.
1418          */
1419         if (alts->desc.bNumEndpoints == 1 &&
1420             !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
1421                 struct usb_host_endpoint *ep = &alts->endpoint[0];
1422                 struct usb_endpoint_descriptor *desc = &ep->desc;
1423
1424                 if (usb_endpoint_is_int_in(desc) &&
1425                     le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
1426                     desc->bInterval != 0) {
1427                         uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
1428                                 "(addr %02x).\n", desc->bEndpointAddress);
1429                         dev->int_ep = ep;
1430                 }
1431         }
1432
1433         return 0;
1434 }
1435
1436 /* ------------------------------------------------------------------------
1437  * UVC device scan
1438  */
1439
1440 /*
1441  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
1442  * and containing the following units:
1443  *
1444  * - one or more Output Terminals (USB Streaming or Display)
1445  * - zero or one Processing Unit
1446  * - zero, one or more single-input Selector Units
1447  * - zero or one multiple-input Selector Units, provided all inputs are
1448  *   connected to input terminals
1449  * - zero, one or mode single-input Extension Units
1450  * - one or more Input Terminals (Camera, External or USB Streaming)
1451  *
1452  * The terminal and units must match on of the following structures:
1453  *
1454  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
1455  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
1456  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
1457  *
1458  *                 +---------+    +---------+ -> OTT_*(0)
1459  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
1460  *                 +---------+    +---------+ -> OTT_*(n)
1461  *
1462  * The Processing Unit and Extension Units can be in any order. Additional
1463  * Extension Units connected to the main chain as single-unit branches are
1464  * also supported. Single-input Selector Units are ignored.
1465  */
1466 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
1467         struct uvc_entity *entity)
1468 {
1469         switch (UVC_ENTITY_TYPE(entity)) {
1470         case UVC_VC_EXTENSION_UNIT:
1471                 if (uvc_trace_param & UVC_TRACE_PROBE)
1472                         printk(KERN_CONT " <- XU %d", entity->id);
1473
1474                 if (entity->bNrInPins != 1) {
1475                         uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
1476                                 "than 1 input pin.\n", entity->id);
1477                         return -1;
1478                 }
1479
1480                 break;
1481
1482         case UVC_VC_PROCESSING_UNIT:
1483                 if (uvc_trace_param & UVC_TRACE_PROBE)
1484                         printk(KERN_CONT " <- PU %d", entity->id);
1485
1486                 if (chain->processing != NULL) {
1487                         uvc_trace(UVC_TRACE_DESCR, "Found multiple "
1488                                 "Processing Units in chain.\n");
1489                         return -1;
1490                 }
1491
1492                 chain->processing = entity;
1493                 break;
1494
1495         case UVC_VC_SELECTOR_UNIT:
1496                 if (uvc_trace_param & UVC_TRACE_PROBE)
1497                         printk(KERN_CONT " <- SU %d", entity->id);
1498
1499                 /* Single-input selector units are ignored. */
1500                 if (entity->bNrInPins == 1)
1501                         break;
1502
1503                 if (chain->selector != NULL) {
1504                         uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
1505                                 "Units in chain.\n");
1506                         return -1;
1507                 }
1508
1509                 chain->selector = entity;
1510                 break;
1511
1512         case UVC_ITT_VENDOR_SPECIFIC:
1513         case UVC_ITT_CAMERA:
1514         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1515                 if (uvc_trace_param & UVC_TRACE_PROBE)
1516                         printk(KERN_CONT " <- IT %d\n", entity->id);
1517
1518                 break;
1519
1520         case UVC_OTT_VENDOR_SPECIFIC:
1521         case UVC_OTT_DISPLAY:
1522         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1523                 if (uvc_trace_param & UVC_TRACE_PROBE)
1524                         printk(KERN_CONT " OT %d", entity->id);
1525
1526                 break;
1527
1528         case UVC_TT_STREAMING:
1529                 if (UVC_ENTITY_IS_ITERM(entity)) {
1530                         if (uvc_trace_param & UVC_TRACE_PROBE)
1531                                 printk(KERN_CONT " <- IT %d\n", entity->id);
1532                 } else {
1533                         if (uvc_trace_param & UVC_TRACE_PROBE)
1534                                 printk(KERN_CONT " OT %d", entity->id);
1535                 }
1536
1537                 break;
1538
1539         default:
1540                 uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
1541                         "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
1542                 return -1;
1543         }
1544
1545         list_add_tail(&entity->chain, &chain->entities);
1546         return 0;
1547 }
1548
1549 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
1550         struct uvc_entity *entity, struct uvc_entity *prev)
1551 {
1552         struct uvc_entity *forward;
1553         int found;
1554
1555         /* Forward scan */
1556         forward = NULL;
1557         found = 0;
1558
1559         while (1) {
1560                 forward = uvc_entity_by_reference(chain->dev, entity->id,
1561                         forward);
1562                 if (forward == NULL)
1563                         break;
1564                 if (forward == prev)
1565                         continue;
1566                 if (forward->chain.next || forward->chain.prev) {
1567                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1568                                 "entity %d already in chain.\n", forward->id);
1569                         return -EINVAL;
1570                 }
1571
1572                 switch (UVC_ENTITY_TYPE(forward)) {
1573                 case UVC_VC_EXTENSION_UNIT:
1574                         if (forward->bNrInPins != 1) {
1575                                 uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
1576                                           "has more than 1 input pin.\n",
1577                                           entity->id);
1578                                 return -EINVAL;
1579                         }
1580
1581                         /*
1582                          * Some devices reference an output terminal as the
1583                          * source of extension units. This is incorrect, as
1584                          * output terminals only have an input pin, and thus
1585                          * can't be connected to any entity in the forward
1586                          * direction. The resulting topology would cause issues
1587                          * when registering the media controller graph. To
1588                          * avoid this problem, connect the extension unit to
1589                          * the source of the output terminal instead.
1590                          */
1591                         if (UVC_ENTITY_IS_OTERM(entity)) {
1592                                 struct uvc_entity *source;
1593
1594                                 source = uvc_entity_by_id(chain->dev,
1595                                                           entity->baSourceID[0]);
1596                                 if (!source) {
1597                                         uvc_trace(UVC_TRACE_DESCR,
1598                                                 "Can't connect extension unit %u in chain\n",
1599                                                 forward->id);
1600                                         break;
1601                                 }
1602
1603                                 forward->baSourceID[0] = source->id;
1604                         }
1605
1606                         list_add_tail(&forward->chain, &chain->entities);
1607                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1608                                 if (!found)
1609                                         printk(KERN_CONT " (->");
1610
1611                                 printk(KERN_CONT " XU %d", forward->id);
1612                                 found = 1;
1613                         }
1614                         break;
1615
1616                 case UVC_OTT_VENDOR_SPECIFIC:
1617                 case UVC_OTT_DISPLAY:
1618                 case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1619                 case UVC_TT_STREAMING:
1620                         if (UVC_ENTITY_IS_ITERM(forward)) {
1621                                 uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
1622                                         "terminal %u.\n", forward->id);
1623                                 return -EINVAL;
1624                         }
1625
1626                         if (UVC_ENTITY_IS_OTERM(entity)) {
1627                                 uvc_trace(UVC_TRACE_DESCR,
1628                                         "Unsupported connection between output terminals %u and %u\n",
1629                                         entity->id, forward->id);
1630                                 break;
1631                         }
1632
1633                         list_add_tail(&forward->chain, &chain->entities);
1634                         if (uvc_trace_param & UVC_TRACE_PROBE) {
1635                                 if (!found)
1636                                         printk(KERN_CONT " (->");
1637
1638                                 printk(KERN_CONT " OT %d", forward->id);
1639                                 found = 1;
1640                         }
1641                         break;
1642                 }
1643         }
1644         if (found)
1645                 printk(KERN_CONT ")");
1646
1647         return 0;
1648 }
1649
1650 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
1651         struct uvc_entity **_entity)
1652 {
1653         struct uvc_entity *entity = *_entity;
1654         struct uvc_entity *term;
1655         int id = -EINVAL, i;
1656
1657         switch (UVC_ENTITY_TYPE(entity)) {
1658         case UVC_VC_EXTENSION_UNIT:
1659         case UVC_VC_PROCESSING_UNIT:
1660                 id = entity->baSourceID[0];
1661                 break;
1662
1663         case UVC_VC_SELECTOR_UNIT:
1664                 /* Single-input selector units are ignored. */
1665                 if (entity->bNrInPins == 1) {
1666                         id = entity->baSourceID[0];
1667                         break;
1668                 }
1669
1670                 if (uvc_trace_param & UVC_TRACE_PROBE)
1671                         printk(KERN_CONT " <- IT");
1672
1673                 chain->selector = entity;
1674                 for (i = 0; i < entity->bNrInPins; ++i) {
1675                         id = entity->baSourceID[i];
1676                         term = uvc_entity_by_id(chain->dev, id);
1677                         if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
1678                                 uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
1679                                         "input %d isn't connected to an "
1680                                         "input terminal\n", entity->id, i);
1681                                 return -1;
1682                         }
1683
1684                         if (term->chain.next || term->chain.prev) {
1685                                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1686                                         "entity %d already in chain.\n",
1687                                         term->id);
1688                                 return -EINVAL;
1689                         }
1690
1691                         if (uvc_trace_param & UVC_TRACE_PROBE)
1692                                 printk(KERN_CONT " %d", term->id);
1693
1694                         list_add_tail(&term->chain, &chain->entities);
1695                         uvc_scan_chain_forward(chain, term, entity);
1696                 }
1697
1698                 if (uvc_trace_param & UVC_TRACE_PROBE)
1699                         printk(KERN_CONT "\n");
1700
1701                 id = 0;
1702                 break;
1703
1704         case UVC_ITT_VENDOR_SPECIFIC:
1705         case UVC_ITT_CAMERA:
1706         case UVC_ITT_MEDIA_TRANSPORT_INPUT:
1707         case UVC_OTT_VENDOR_SPECIFIC:
1708         case UVC_OTT_DISPLAY:
1709         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
1710         case UVC_TT_STREAMING:
1711                 id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
1712                 break;
1713         }
1714
1715         if (id <= 0) {
1716                 *_entity = NULL;
1717                 return id;
1718         }
1719
1720         entity = uvc_entity_by_id(chain->dev, id);
1721         if (entity == NULL) {
1722                 uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1723                         "unknown entity %d.\n", id);
1724                 return -EINVAL;
1725         }
1726
1727         *_entity = entity;
1728         return 0;
1729 }
1730
1731 static int uvc_scan_chain(struct uvc_video_chain *chain,
1732                           struct uvc_entity *term)
1733 {
1734         struct uvc_entity *entity, *prev;
1735
1736         uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain:");
1737
1738         entity = term;
1739         prev = NULL;
1740
1741         while (entity != NULL) {
1742                 /* Entity must not be part of an existing chain */
1743                 if (entity->chain.next || entity->chain.prev) {
1744                         uvc_trace(UVC_TRACE_DESCR, "Found reference to "
1745                                 "entity %d already in chain.\n", entity->id);
1746                         return -EINVAL;
1747                 }
1748
1749                 /* Process entity */
1750                 if (uvc_scan_chain_entity(chain, entity) < 0)
1751                         return -EINVAL;
1752
1753                 /* Forward scan */
1754                 if (uvc_scan_chain_forward(chain, entity, prev) < 0)
1755                         return -EINVAL;
1756
1757                 /* Backward scan */
1758                 prev = entity;
1759                 if (uvc_scan_chain_backward(chain, &entity) < 0)
1760                         return -EINVAL;
1761         }
1762
1763         return 0;
1764 }
1765
1766 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
1767                 char *buffer)
1768 {
1769         struct uvc_entity *term;
1770         unsigned int nterms = 0;
1771         char *p = buffer;
1772
1773         list_for_each_entry(term, terms, chain) {
1774                 if (!UVC_ENTITY_IS_TERM(term) ||
1775                     UVC_TERM_DIRECTION(term) != dir)
1776                         continue;
1777
1778                 if (nterms)
1779                         p += sprintf(p, ",");
1780                 if (++nterms >= 4) {
1781                         p += sprintf(p, "...");
1782                         break;
1783                 }
1784                 p += sprintf(p, "%u", term->id);
1785         }
1786
1787         return p - buffer;
1788 }
1789
1790 static const char *uvc_print_chain(struct uvc_video_chain *chain)
1791 {
1792         static char buffer[43];
1793         char *p = buffer;
1794
1795         p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
1796         p += sprintf(p, " -> ");
1797         uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
1798
1799         return buffer;
1800 }
1801
1802 static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev)
1803 {
1804         struct uvc_video_chain *chain;
1805
1806         chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1807         if (chain == NULL)
1808                 return NULL;
1809
1810         INIT_LIST_HEAD(&chain->entities);
1811         mutex_init(&chain->ctrl_mutex);
1812         chain->dev = dev;
1813         v4l2_prio_init(&chain->prio);
1814
1815         return chain;
1816 }
1817
1818 /*
1819  * Fallback heuristic for devices that don't connect units and terminals in a
1820  * valid chain.
1821  *
1822  * Some devices have invalid baSourceID references, causing uvc_scan_chain()
1823  * to fail, but if we just take the entities we can find and put them together
1824  * in the most sensible chain we can think of, turns out they do work anyway.
1825  * Note: This heuristic assumes there is a single chain.
1826  *
1827  * At the time of writing, devices known to have such a broken chain are
1828  *  - Acer Integrated Camera (5986:055a)
1829  *  - Realtek rtl157a7 (0bda:57a7)
1830  */
1831 static int uvc_scan_fallback(struct uvc_device *dev)
1832 {
1833         struct uvc_video_chain *chain;
1834         struct uvc_entity *iterm = NULL;
1835         struct uvc_entity *oterm = NULL;
1836         struct uvc_entity *entity;
1837         struct uvc_entity *prev;
1838
1839         /*
1840          * Start by locating the input and output terminals. We only support
1841          * devices with exactly one of each for now.
1842          */
1843         list_for_each_entry(entity, &dev->entities, list) {
1844                 if (UVC_ENTITY_IS_ITERM(entity)) {
1845                         if (iterm)
1846                                 return -EINVAL;
1847                         iterm = entity;
1848                 }
1849
1850                 if (UVC_ENTITY_IS_OTERM(entity)) {
1851                         if (oterm)
1852                                 return -EINVAL;
1853                         oterm = entity;
1854                 }
1855         }
1856
1857         if (iterm == NULL || oterm == NULL)
1858                 return -EINVAL;
1859
1860         /* Allocate the chain and fill it. */
1861         chain = uvc_alloc_chain(dev);
1862         if (chain == NULL)
1863                 return -ENOMEM;
1864
1865         if (uvc_scan_chain_entity(chain, oterm) < 0)
1866                 goto error;
1867
1868         prev = oterm;
1869
1870         /*
1871          * Add all Processing and Extension Units with two pads. The order
1872          * doesn't matter much, use reverse list traversal to connect units in
1873          * UVC descriptor order as we build the chain from output to input. This
1874          * leads to units appearing in the order meant by the manufacturer for
1875          * the cameras known to require this heuristic.
1876          */
1877         list_for_each_entry_reverse(entity, &dev->entities, list) {
1878                 if (entity->type != UVC_VC_PROCESSING_UNIT &&
1879                     entity->type != UVC_VC_EXTENSION_UNIT)
1880                         continue;
1881
1882                 if (entity->num_pads != 2)
1883                         continue;
1884
1885                 if (uvc_scan_chain_entity(chain, entity) < 0)
1886                         goto error;
1887
1888                 prev->baSourceID[0] = entity->id;
1889                 prev = entity;
1890         }
1891
1892         if (uvc_scan_chain_entity(chain, iterm) < 0)
1893                 goto error;
1894
1895         prev->baSourceID[0] = iterm->id;
1896
1897         list_add_tail(&chain->list, &dev->chains);
1898
1899         uvc_trace(UVC_TRACE_PROBE,
1900                   "Found a video chain by fallback heuristic (%s).\n",
1901                   uvc_print_chain(chain));
1902
1903         return 0;
1904
1905 error:
1906         kfree(chain);
1907         return -EINVAL;
1908 }
1909
1910 /*
1911  * Scan the device for video chains and register video devices.
1912  *
1913  * Chains are scanned starting at their output terminals and walked backwards.
1914  */
1915 static int uvc_scan_device(struct uvc_device *dev)
1916 {
1917         struct uvc_video_chain *chain;
1918         struct uvc_entity *term;
1919
1920         list_for_each_entry(term, &dev->entities, list) {
1921                 if (!UVC_ENTITY_IS_OTERM(term))
1922                         continue;
1923
1924                 /* If the terminal is already included in a chain, skip it.
1925                  * This can happen for chains that have multiple output
1926                  * terminals, where all output terminals beside the first one
1927                  * will be inserted in the chain in forward scans.
1928                  */
1929                 if (term->chain.next || term->chain.prev)
1930                         continue;
1931
1932                 chain = uvc_alloc_chain(dev);
1933                 if (chain == NULL)
1934                         return -ENOMEM;
1935
1936                 term->flags |= UVC_ENTITY_FLAG_DEFAULT;
1937
1938                 if (uvc_scan_chain(chain, term) < 0) {
1939                         kfree(chain);
1940                         continue;
1941                 }
1942
1943                 uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
1944                           uvc_print_chain(chain));
1945
1946                 list_add_tail(&chain->list, &dev->chains);
1947         }
1948
1949         if (list_empty(&dev->chains))
1950                 uvc_scan_fallback(dev);
1951
1952         if (list_empty(&dev->chains)) {
1953                 uvc_printk(KERN_INFO, "No valid video chain found.\n");
1954                 return -1;
1955         }
1956
1957         return 0;
1958 }
1959
1960 /* ------------------------------------------------------------------------
1961  * Video device registration and unregistration
1962  */
1963
1964 /*
1965  * Delete the UVC device.
1966  *
1967  * Called by the kernel when the last reference to the uvc_device structure
1968  * is released.
1969  *
1970  * As this function is called after or during disconnect(), all URBs have
1971  * already been cancelled by the USB core. There is no need to kill the
1972  * interrupt URB manually.
1973  */
1974 static void uvc_delete(struct kref *kref)
1975 {
1976         struct uvc_device *dev = container_of(kref, struct uvc_device, ref);
1977         struct list_head *p, *n;
1978
1979         uvc_status_cleanup(dev);
1980         uvc_ctrl_cleanup_device(dev);
1981
1982         usb_put_intf(dev->intf);
1983         usb_put_dev(dev->udev);
1984
1985 #ifdef CONFIG_MEDIA_CONTROLLER
1986         media_device_cleanup(&dev->mdev);
1987 #endif
1988
1989         list_for_each_safe(p, n, &dev->chains) {
1990                 struct uvc_video_chain *chain;
1991                 chain = list_entry(p, struct uvc_video_chain, list);
1992                 kfree(chain);
1993         }
1994
1995         list_for_each_safe(p, n, &dev->entities) {
1996                 struct uvc_entity *entity;
1997                 entity = list_entry(p, struct uvc_entity, list);
1998 #ifdef CONFIG_MEDIA_CONTROLLER
1999                 uvc_mc_cleanup_entity(entity);
2000 #endif
2001                 kfree(entity);
2002         }
2003
2004         list_for_each_safe(p, n, &dev->streams) {
2005                 struct uvc_streaming *streaming;
2006                 streaming = list_entry(p, struct uvc_streaming, list);
2007                 usb_driver_release_interface(&uvc_driver.driver,
2008                         streaming->intf);
2009                 uvc_stream_delete(streaming);
2010         }
2011
2012         kfree(dev);
2013 }
2014
2015 static void uvc_release(struct video_device *vdev)
2016 {
2017         struct uvc_streaming *stream = video_get_drvdata(vdev);
2018         struct uvc_device *dev = stream->dev;
2019
2020         kref_put(&dev->ref, uvc_delete);
2021 }
2022
2023 /*
2024  * Unregister the video devices.
2025  */
2026 static void uvc_unregister_video(struct uvc_device *dev)
2027 {
2028         struct uvc_streaming *stream;
2029
2030         list_for_each_entry(stream, &dev->streams, list) {
2031                 if (!video_is_registered(&stream->vdev))
2032                         continue;
2033
2034                 video_unregister_device(&stream->vdev);
2035                 video_unregister_device(&stream->meta.vdev);
2036
2037                 uvc_debugfs_cleanup_stream(stream);
2038         }
2039
2040         uvc_status_unregister(dev);
2041
2042         if (dev->vdev.dev)
2043                 v4l2_device_unregister(&dev->vdev);
2044 #ifdef CONFIG_MEDIA_CONTROLLER
2045         if (media_devnode_is_registered(dev->mdev.devnode))
2046                 media_device_unregister(&dev->mdev);
2047 #endif
2048 }
2049
2050 int uvc_register_video_device(struct uvc_device *dev,
2051                               struct uvc_streaming *stream,
2052                               struct video_device *vdev,
2053                               struct uvc_video_queue *queue,
2054                               enum v4l2_buf_type type,
2055                               const struct v4l2_file_operations *fops,
2056                               const struct v4l2_ioctl_ops *ioctl_ops)
2057 {
2058         int ret;
2059
2060         /* Initialize the video buffers queue. */
2061         ret = uvc_queue_init(queue, type, !uvc_no_drop_param);
2062         if (ret)
2063                 return ret;
2064
2065         /* Register the device with V4L. */
2066
2067         /*
2068          * We already hold a reference to dev->udev. The video device will be
2069          * unregistered before the reference is released, so we don't need to
2070          * get another one.
2071          */
2072         vdev->v4l2_dev = &dev->vdev;
2073         vdev->fops = fops;
2074         vdev->ioctl_ops = ioctl_ops;
2075         vdev->release = uvc_release;
2076         vdev->prio = &stream->chain->prio;
2077         if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
2078                 vdev->vfl_dir = VFL_DIR_TX;
2079         else
2080                 vdev->vfl_dir = VFL_DIR_RX;
2081
2082         switch (type) {
2083         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
2084         default:
2085                 vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
2086                 break;
2087         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
2088                 vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
2089                 break;
2090         case V4L2_BUF_TYPE_META_CAPTURE:
2091                 vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
2092                 break;
2093         }
2094
2095         strscpy(vdev->name, dev->name, sizeof(vdev->name));
2096
2097         /*
2098          * Set the driver data before calling video_register_device, otherwise
2099          * the file open() handler might race us.
2100          */
2101         video_set_drvdata(vdev, stream);
2102
2103         ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
2104         if (ret < 0) {
2105                 uvc_printk(KERN_ERR, "Failed to register %s device (%d).\n",
2106                            v4l2_type_names[type], ret);
2107                 return ret;
2108         }
2109
2110         kref_get(&dev->ref);
2111         return 0;
2112 }
2113
2114 static int uvc_register_video(struct uvc_device *dev,
2115                 struct uvc_streaming *stream)
2116 {
2117         int ret;
2118
2119         /* Initialize the streaming interface with default parameters. */
2120         ret = uvc_video_init(stream);
2121         if (ret < 0) {
2122                 uvc_printk(KERN_ERR, "Failed to initialize the device (%d).\n",
2123                            ret);
2124                 return ret;
2125         }
2126
2127         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
2128                 stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE
2129                         | V4L2_CAP_META_CAPTURE;
2130         else
2131                 stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
2132
2133         uvc_debugfs_init_stream(stream);
2134
2135         /* Register the device with V4L. */
2136         return uvc_register_video_device(dev, stream, &stream->vdev,
2137                                          &stream->queue, stream->type,
2138                                          &uvc_fops, &uvc_ioctl_ops);
2139 }
2140
2141 /*
2142  * Register all video devices in all chains.
2143  */
2144 static int uvc_register_terms(struct uvc_device *dev,
2145         struct uvc_video_chain *chain)
2146 {
2147         struct uvc_streaming *stream;
2148         struct uvc_entity *term;
2149         int ret;
2150
2151         list_for_each_entry(term, &chain->entities, chain) {
2152                 if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
2153                         continue;
2154
2155                 stream = uvc_stream_by_id(dev, term->id);
2156                 if (stream == NULL) {
2157                         uvc_printk(KERN_INFO, "No streaming interface found "
2158                                    "for terminal %u.", term->id);
2159                         continue;
2160                 }
2161
2162                 stream->chain = chain;
2163                 ret = uvc_register_video(dev, stream);
2164                 if (ret < 0)
2165                         return ret;
2166
2167                 /* Register a metadata node, but ignore a possible failure,
2168                  * complete registration of video nodes anyway.
2169                  */
2170                 uvc_meta_register(stream);
2171
2172                 term->vdev = &stream->vdev;
2173         }
2174
2175         return 0;
2176 }
2177
2178 static int uvc_register_chains(struct uvc_device *dev)
2179 {
2180         struct uvc_video_chain *chain;
2181         int ret;
2182
2183         list_for_each_entry(chain, &dev->chains, list) {
2184                 ret = uvc_register_terms(dev, chain);
2185                 if (ret < 0)
2186                         return ret;
2187
2188 #ifdef CONFIG_MEDIA_CONTROLLER
2189                 ret = uvc_mc_register_entities(chain);
2190                 if (ret < 0)
2191                         uvc_printk(KERN_INFO,
2192                                    "Failed to register entities (%d).\n", ret);
2193 #endif
2194         }
2195
2196         return 0;
2197 }
2198
2199 /* ------------------------------------------------------------------------
2200  * USB probe, disconnect, suspend and resume
2201  */
2202
2203 static const struct uvc_device_info uvc_quirk_none = { 0 };
2204
2205 static int uvc_probe(struct usb_interface *intf,
2206                      const struct usb_device_id *id)
2207 {
2208         struct usb_device *udev = interface_to_usbdev(intf);
2209         struct uvc_device *dev;
2210         const struct uvc_device_info *info =
2211                 (const struct uvc_device_info *)id->driver_info;
2212         int function;
2213         int ret;
2214
2215         if (id->idVendor && id->idProduct)
2216                 uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
2217                                 "(%04x:%04x)\n", udev->devpath, id->idVendor,
2218                                 id->idProduct);
2219         else
2220                 uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
2221                                 udev->devpath);
2222
2223         /* Allocate memory for the device and initialize it. */
2224         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2225         if (dev == NULL)
2226                 return -ENOMEM;
2227
2228         INIT_LIST_HEAD(&dev->entities);
2229         INIT_LIST_HEAD(&dev->chains);
2230         INIT_LIST_HEAD(&dev->streams);
2231         kref_init(&dev->ref);
2232         atomic_set(&dev->nmappings, 0);
2233         mutex_init(&dev->lock);
2234
2235         dev->udev = usb_get_dev(udev);
2236         dev->intf = usb_get_intf(intf);
2237         dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
2238         dev->info = info ? info : &uvc_quirk_none;
2239         dev->quirks = uvc_quirks_param == -1
2240                     ? dev->info->quirks : uvc_quirks_param;
2241
2242         if (udev->product != NULL)
2243                 strscpy(dev->name, udev->product, sizeof(dev->name));
2244         else
2245                 snprintf(dev->name, sizeof(dev->name),
2246                          "UVC Camera (%04x:%04x)",
2247                          le16_to_cpu(udev->descriptor.idVendor),
2248                          le16_to_cpu(udev->descriptor.idProduct));
2249
2250         /*
2251          * Add iFunction or iInterface to names when available as additional
2252          * distinguishers between interfaces. iFunction is prioritized over
2253          * iInterface which matches Windows behavior at the point of writing.
2254          */
2255         if (intf->intf_assoc && intf->intf_assoc->iFunction != 0)
2256                 function = intf->intf_assoc->iFunction;
2257         else
2258                 function = intf->cur_altsetting->desc.iInterface;
2259         if (function != 0) {
2260                 size_t len;
2261
2262                 strlcat(dev->name, ": ", sizeof(dev->name));
2263                 len = strlen(dev->name);
2264                 usb_string(udev, function, dev->name + len,
2265                            sizeof(dev->name) - len);
2266         }
2267
2268         /* Initialize the media device. */
2269 #ifdef CONFIG_MEDIA_CONTROLLER
2270         dev->mdev.dev = &intf->dev;
2271         strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
2272         if (udev->serial)
2273                 strscpy(dev->mdev.serial, udev->serial,
2274                         sizeof(dev->mdev.serial));
2275         usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));
2276         dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
2277         media_device_init(&dev->mdev);
2278
2279         dev->vdev.mdev = &dev->mdev;
2280 #endif
2281
2282         /* Parse the Video Class control descriptor. */
2283         if (uvc_parse_control(dev) < 0) {
2284                 uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
2285                         "descriptors.\n");
2286                 goto error;
2287         }
2288
2289         uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
2290                 dev->uvc_version >> 8, dev->uvc_version & 0xff,
2291                 udev->product ? udev->product : "<unnamed>",
2292                 le16_to_cpu(udev->descriptor.idVendor),
2293                 le16_to_cpu(udev->descriptor.idProduct));
2294
2295         if (dev->quirks != dev->info->quirks) {
2296                 uvc_printk(KERN_INFO, "Forcing device quirks to 0x%x by module "
2297                         "parameter for testing purpose.\n", dev->quirks);
2298                 uvc_printk(KERN_INFO, "Please report required quirks to the "
2299                         "linux-uvc-devel mailing list.\n");
2300         }
2301
2302         /* Register the V4L2 device. */
2303         if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
2304                 goto error;
2305
2306         /* Initialize controls. */
2307         if (uvc_ctrl_init_device(dev) < 0)
2308                 goto error;
2309
2310         /* Scan the device for video chains. */
2311         if (uvc_scan_device(dev) < 0)
2312                 goto error;
2313
2314         /* Register video device nodes. */
2315         if (uvc_register_chains(dev) < 0)
2316                 goto error;
2317
2318 #ifdef CONFIG_MEDIA_CONTROLLER
2319         /* Register the media device node */
2320         if (media_device_register(&dev->mdev) < 0)
2321                 goto error;
2322 #endif
2323         /* Save our data pointer in the interface data. */
2324         usb_set_intfdata(intf, dev);
2325
2326         /* Initialize the interrupt URB. */
2327         if ((ret = uvc_status_init(dev)) < 0) {
2328                 uvc_printk(KERN_INFO, "Unable to initialize the status "
2329                         "endpoint (%d), status interrupt will not be "
2330                         "supported.\n", ret);
2331         }
2332
2333         uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
2334         usb_enable_autosuspend(udev);
2335         return 0;
2336
2337 error:
2338         uvc_unregister_video(dev);
2339         kref_put(&dev->ref, uvc_delete);
2340         return -ENODEV;
2341 }
2342
2343 static void uvc_disconnect(struct usb_interface *intf)
2344 {
2345         struct uvc_device *dev = usb_get_intfdata(intf);
2346
2347         /* Set the USB interface data to NULL. This can be done outside the
2348          * lock, as there's no other reader.
2349          */
2350         usb_set_intfdata(intf, NULL);
2351
2352         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2353             UVC_SC_VIDEOSTREAMING)
2354                 return;
2355
2356         uvc_unregister_video(dev);
2357         kref_put(&dev->ref, uvc_delete);
2358 }
2359
2360 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
2361 {
2362         struct uvc_device *dev = usb_get_intfdata(intf);
2363         struct uvc_streaming *stream;
2364
2365         uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
2366                 intf->cur_altsetting->desc.bInterfaceNumber);
2367
2368         /* Controls are cached on the fly so they don't need to be saved. */
2369         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2370             UVC_SC_VIDEOCONTROL) {
2371                 mutex_lock(&dev->lock);
2372                 if (dev->users)
2373                         uvc_status_stop(dev);
2374                 mutex_unlock(&dev->lock);
2375                 return 0;
2376         }
2377
2378         list_for_each_entry(stream, &dev->streams, list) {
2379                 if (stream->intf == intf)
2380                         return uvc_video_suspend(stream);
2381         }
2382
2383         uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
2384                         "mismatch.\n");
2385         return -EINVAL;
2386 }
2387
2388 static int __uvc_resume(struct usb_interface *intf, int reset)
2389 {
2390         struct uvc_device *dev = usb_get_intfdata(intf);
2391         struct uvc_streaming *stream;
2392         int ret = 0;
2393
2394         uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
2395                 intf->cur_altsetting->desc.bInterfaceNumber);
2396
2397         if (intf->cur_altsetting->desc.bInterfaceSubClass ==
2398             UVC_SC_VIDEOCONTROL) {
2399                 if (reset) {
2400                         ret = uvc_ctrl_restore_values(dev);
2401                         if (ret < 0)
2402                                 return ret;
2403                 }
2404
2405                 mutex_lock(&dev->lock);
2406                 if (dev->users)
2407                         ret = uvc_status_start(dev, GFP_NOIO);
2408                 mutex_unlock(&dev->lock);
2409
2410                 return ret;
2411         }
2412
2413         list_for_each_entry(stream, &dev->streams, list) {
2414                 if (stream->intf == intf) {
2415                         ret = uvc_video_resume(stream, reset);
2416                         if (ret < 0)
2417                                 uvc_queue_streamoff(&stream->queue,
2418                                                     stream->queue.queue.type);
2419                         return ret;
2420                 }
2421         }
2422
2423         uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
2424                         "mismatch.\n");
2425         return -EINVAL;
2426 }
2427
2428 static int uvc_resume(struct usb_interface *intf)
2429 {
2430         return __uvc_resume(intf, 0);
2431 }
2432
2433 static int uvc_reset_resume(struct usb_interface *intf)
2434 {
2435         return __uvc_resume(intf, 1);
2436 }
2437
2438 /* ------------------------------------------------------------------------
2439  * Module parameters
2440  */
2441
2442 static int uvc_clock_param_get(char *buffer, const struct kernel_param *kp)
2443 {
2444         if (uvc_clock_param == CLOCK_MONOTONIC)
2445                 return sprintf(buffer, "CLOCK_MONOTONIC");
2446         else
2447                 return sprintf(buffer, "CLOCK_REALTIME");
2448 }
2449
2450 static int uvc_clock_param_set(const char *val, const struct kernel_param *kp)
2451 {
2452         if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
2453                 val += strlen("clock_");
2454
2455         if (strcasecmp(val, "monotonic") == 0)
2456                 uvc_clock_param = CLOCK_MONOTONIC;
2457         else if (strcasecmp(val, "realtime") == 0)
2458                 uvc_clock_param = CLOCK_REALTIME;
2459         else
2460                 return -EINVAL;
2461
2462         return 0;
2463 }
2464
2465 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
2466                   &uvc_clock_param, S_IRUGO|S_IWUSR);
2467 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
2468 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, S_IRUGO|S_IWUSR);
2469 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
2470 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
2471 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
2472 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
2473 MODULE_PARM_DESC(quirks, "Forced device quirks");
2474 module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
2475 MODULE_PARM_DESC(trace, "Trace level bitmask");
2476 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
2477 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
2478
2479 /* ------------------------------------------------------------------------
2480  * Driver initialization and cleanup
2481  */
2482
2483 static const struct uvc_device_info uvc_quirk_probe_minmax = {
2484         .quirks = UVC_QUIRK_PROBE_MINMAX,
2485 };
2486
2487 static const struct uvc_device_info uvc_quirk_fix_bandwidth = {
2488         .quirks = UVC_QUIRK_FIX_BANDWIDTH,
2489 };
2490
2491 static const struct uvc_device_info uvc_quirk_probe_def = {
2492         .quirks = UVC_QUIRK_PROBE_DEF,
2493 };
2494
2495 static const struct uvc_device_info uvc_quirk_stream_no_fid = {
2496         .quirks = UVC_QUIRK_STREAM_NO_FID,
2497 };
2498
2499 static const struct uvc_device_info uvc_quirk_force_y8 = {
2500         .quirks = UVC_QUIRK_FORCE_Y8,
2501 };
2502
2503 #define UVC_INFO_QUIRK(q) (kernel_ulong_t)&(struct uvc_device_info){.quirks = q}
2504 #define UVC_INFO_META(m) (kernel_ulong_t)&(struct uvc_device_info) \
2505         {.meta_format = m}
2506
2507 /*
2508  * The Logitech cameras listed below have their interface class set to
2509  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
2510  * though they are compliant.
2511  */
2512 static const struct usb_device_id uvc_ids[] = {
2513         /* LogiLink Wireless Webcam */
2514         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2515                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2516           .idVendor             = 0x0416,
2517           .idProduct            = 0xa91a,
2518           .bInterfaceClass      = USB_CLASS_VIDEO,
2519           .bInterfaceSubClass   = 1,
2520           .bInterfaceProtocol   = 0,
2521           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2522         /* Genius eFace 2025 */
2523         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2524                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2525           .idVendor             = 0x0458,
2526           .idProduct            = 0x706e,
2527           .bInterfaceClass      = USB_CLASS_VIDEO,
2528           .bInterfaceSubClass   = 1,
2529           .bInterfaceProtocol   = 0,
2530           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2531         /* Microsoft Lifecam NX-6000 */
2532         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2533                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2534           .idVendor             = 0x045e,
2535           .idProduct            = 0x00f8,
2536           .bInterfaceClass      = USB_CLASS_VIDEO,
2537           .bInterfaceSubClass   = 1,
2538           .bInterfaceProtocol   = 0,
2539           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2540         /* Microsoft Lifecam NX-3000 */
2541         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2542                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2543           .idVendor             = 0x045e,
2544           .idProduct            = 0x0721,
2545           .bInterfaceClass      = USB_CLASS_VIDEO,
2546           .bInterfaceSubClass   = 1,
2547           .bInterfaceProtocol   = 0,
2548           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2549         /* Microsoft Lifecam VX-7000 */
2550         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2551                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2552           .idVendor             = 0x045e,
2553           .idProduct            = 0x0723,
2554           .bInterfaceClass      = USB_CLASS_VIDEO,
2555           .bInterfaceSubClass   = 1,
2556           .bInterfaceProtocol   = 0,
2557           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2558         /* Logitech, Webcam C910 */
2559         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2560                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2561           .idVendor             = 0x046d,
2562           .idProduct            = 0x0821,
2563           .bInterfaceClass      = USB_CLASS_VIDEO,
2564           .bInterfaceSubClass   = 1,
2565           .bInterfaceProtocol   = 0,
2566           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_WAKE_AUTOSUSPEND)},
2567         /* Logitech, Webcam B910 */
2568         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2569                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2570           .idVendor             = 0x046d,
2571           .idProduct            = 0x0823,
2572           .bInterfaceClass      = USB_CLASS_VIDEO,
2573           .bInterfaceSubClass   = 1,
2574           .bInterfaceProtocol   = 0,
2575           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_WAKE_AUTOSUSPEND)},
2576         /* Logitech Quickcam Fusion */
2577         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2578                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2579           .idVendor             = 0x046d,
2580           .idProduct            = 0x08c1,
2581           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2582           .bInterfaceSubClass   = 1,
2583           .bInterfaceProtocol   = 0 },
2584         /* Logitech Quickcam Orbit MP */
2585         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2586                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2587           .idVendor             = 0x046d,
2588           .idProduct            = 0x08c2,
2589           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2590           .bInterfaceSubClass   = 1,
2591           .bInterfaceProtocol   = 0 },
2592         /* Logitech Quickcam Pro for Notebook */
2593         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2594                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2595           .idVendor             = 0x046d,
2596           .idProduct            = 0x08c3,
2597           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2598           .bInterfaceSubClass   = 1,
2599           .bInterfaceProtocol   = 0 },
2600         /* Logitech Quickcam Pro 5000 */
2601         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2602                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2603           .idVendor             = 0x046d,
2604           .idProduct            = 0x08c5,
2605           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2606           .bInterfaceSubClass   = 1,
2607           .bInterfaceProtocol   = 0 },
2608         /* Logitech Quickcam OEM Dell Notebook */
2609         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2610                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2611           .idVendor             = 0x046d,
2612           .idProduct            = 0x08c6,
2613           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2614           .bInterfaceSubClass   = 1,
2615           .bInterfaceProtocol   = 0 },
2616         /* Logitech Quickcam OEM Cisco VT Camera II */
2617         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2618                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2619           .idVendor             = 0x046d,
2620           .idProduct            = 0x08c7,
2621           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2622           .bInterfaceSubClass   = 1,
2623           .bInterfaceProtocol   = 0 },
2624         /* Logitech HD Pro Webcam C920 */
2625         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2626                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2627           .idVendor             = 0x046d,
2628           .idProduct            = 0x082d,
2629           .bInterfaceClass      = USB_CLASS_VIDEO,
2630           .bInterfaceSubClass   = 1,
2631           .bInterfaceProtocol   = 0,
2632           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT) },
2633         /* Chicony CNF7129 (Asus EEE 100HE) */
2634         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2635                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2636           .idVendor             = 0x04f2,
2637           .idProduct            = 0xb071,
2638           .bInterfaceClass      = USB_CLASS_VIDEO,
2639           .bInterfaceSubClass   = 1,
2640           .bInterfaceProtocol   = 0,
2641           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTRICT_FRAME_RATE) },
2642         /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
2643         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2644                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2645           .idVendor             = 0x058f,
2646           .idProduct            = 0x3820,
2647           .bInterfaceClass      = USB_CLASS_VIDEO,
2648           .bInterfaceSubClass   = 1,
2649           .bInterfaceProtocol   = 0,
2650           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2651         /* Dell XPS m1530 */
2652         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2653                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2654           .idVendor             = 0x05a9,
2655           .idProduct            = 0x2640,
2656           .bInterfaceClass      = USB_CLASS_VIDEO,
2657           .bInterfaceSubClass   = 1,
2658           .bInterfaceProtocol   = 0,
2659           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2660         /* Dell SP2008WFP Monitor */
2661         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2662                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2663           .idVendor             = 0x05a9,
2664           .idProduct            = 0x2641,
2665           .bInterfaceClass      = USB_CLASS_VIDEO,
2666           .bInterfaceSubClass   = 1,
2667           .bInterfaceProtocol   = 0,
2668           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2669         /* Dell Alienware X51 */
2670         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2671                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2672           .idVendor             = 0x05a9,
2673           .idProduct            = 0x2643,
2674           .bInterfaceClass      = USB_CLASS_VIDEO,
2675           .bInterfaceSubClass   = 1,
2676           .bInterfaceProtocol   = 0,
2677           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2678         /* Dell Studio Hybrid 140g (OmniVision webcam) */
2679         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2680                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2681           .idVendor             = 0x05a9,
2682           .idProduct            = 0x264a,
2683           .bInterfaceClass      = USB_CLASS_VIDEO,
2684           .bInterfaceSubClass   = 1,
2685           .bInterfaceProtocol   = 0,
2686           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2687         /* Dell XPS M1330 (OmniVision OV7670 webcam) */
2688         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2689                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2690           .idVendor             = 0x05a9,
2691           .idProduct            = 0x7670,
2692           .bInterfaceClass      = USB_CLASS_VIDEO,
2693           .bInterfaceSubClass   = 1,
2694           .bInterfaceProtocol   = 0,
2695           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2696         /* Apple Built-In iSight */
2697         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2698                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2699           .idVendor             = 0x05ac,
2700           .idProduct            = 0x8501,
2701           .bInterfaceClass      = USB_CLASS_VIDEO,
2702           .bInterfaceSubClass   = 1,
2703           .bInterfaceProtocol   = 0,
2704           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2705                                         | UVC_QUIRK_BUILTIN_ISIGHT) },
2706         /* Apple Built-In iSight via iBridge */
2707         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2708                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2709           .idVendor             = 0x05ac,
2710           .idProduct            = 0x8600,
2711           .bInterfaceClass      = USB_CLASS_VIDEO,
2712           .bInterfaceSubClass   = 1,
2713           .bInterfaceProtocol   = 0,
2714           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2715         /* Foxlink ("HP Webcam" on HP Mini 5103) */
2716         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2717                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2718           .idVendor             = 0x05c8,
2719           .idProduct            = 0x0403,
2720           .bInterfaceClass      = USB_CLASS_VIDEO,
2721           .bInterfaceSubClass   = 1,
2722           .bInterfaceProtocol   = 0,
2723           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2724         /* Genesys Logic USB 2.0 PC Camera */
2725         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2726                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2727           .idVendor             = 0x05e3,
2728           .idProduct            = 0x0505,
2729           .bInterfaceClass      = USB_CLASS_VIDEO,
2730           .bInterfaceSubClass   = 1,
2731           .bInterfaceProtocol   = 0,
2732           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2733         /* Hercules Classic Silver */
2734         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2735                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2736           .idVendor             = 0x06f8,
2737           .idProduct            = 0x300c,
2738           .bInterfaceClass      = USB_CLASS_VIDEO,
2739           .bInterfaceSubClass   = 1,
2740           .bInterfaceProtocol   = 0,
2741           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2742         /* ViMicro Vega */
2743         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2744                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2745           .idVendor             = 0x0ac8,
2746           .idProduct            = 0x332d,
2747           .bInterfaceClass      = USB_CLASS_VIDEO,
2748           .bInterfaceSubClass   = 1,
2749           .bInterfaceProtocol   = 0,
2750           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2751         /* ViMicro - Minoru3D */
2752         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2753                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2754           .idVendor             = 0x0ac8,
2755           .idProduct            = 0x3410,
2756           .bInterfaceClass      = USB_CLASS_VIDEO,
2757           .bInterfaceSubClass   = 1,
2758           .bInterfaceProtocol   = 0,
2759           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2760         /* ViMicro Venus - Minoru3D */
2761         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2762                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2763           .idVendor             = 0x0ac8,
2764           .idProduct            = 0x3420,
2765           .bInterfaceClass      = USB_CLASS_VIDEO,
2766           .bInterfaceSubClass   = 1,
2767           .bInterfaceProtocol   = 0,
2768           .driver_info          = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
2769         /* Ophir Optronics - SPCAM 620U */
2770         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2771                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2772           .idVendor             = 0x0bd3,
2773           .idProduct            = 0x0555,
2774           .bInterfaceClass      = USB_CLASS_VIDEO,
2775           .bInterfaceSubClass   = 1,
2776           .bInterfaceProtocol   = 0,
2777           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2778         /* MT6227 */
2779         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2780                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2781           .idVendor             = 0x0e8d,
2782           .idProduct            = 0x0004,
2783           .bInterfaceClass      = USB_CLASS_VIDEO,
2784           .bInterfaceSubClass   = 1,
2785           .bInterfaceProtocol   = 0,
2786           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2787                                         | UVC_QUIRK_PROBE_DEF) },
2788         /* IMC Networks (Medion Akoya) */
2789         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2790                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2791           .idVendor             = 0x13d3,
2792           .idProduct            = 0x5103,
2793           .bInterfaceClass      = USB_CLASS_VIDEO,
2794           .bInterfaceSubClass   = 1,
2795           .bInterfaceProtocol   = 0,
2796           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2797         /* JMicron USB2.0 XGA WebCam */
2798         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2799                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2800           .idVendor             = 0x152d,
2801           .idProduct            = 0x0310,
2802           .bInterfaceClass      = USB_CLASS_VIDEO,
2803           .bInterfaceSubClass   = 1,
2804           .bInterfaceProtocol   = 0,
2805           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2806         /* Syntek (HP Spartan) */
2807         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2808                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2809           .idVendor             = 0x174f,
2810           .idProduct            = 0x5212,
2811           .bInterfaceClass      = USB_CLASS_VIDEO,
2812           .bInterfaceSubClass   = 1,
2813           .bInterfaceProtocol   = 0,
2814           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2815         /* Syntek (Samsung Q310) */
2816         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2817                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2818           .idVendor             = 0x174f,
2819           .idProduct            = 0x5931,
2820           .bInterfaceClass      = USB_CLASS_VIDEO,
2821           .bInterfaceSubClass   = 1,
2822           .bInterfaceProtocol   = 0,
2823           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2824         /* Syntek (Packard Bell EasyNote MX52 */
2825         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2826                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2827           .idVendor             = 0x174f,
2828           .idProduct            = 0x8a12,
2829           .bInterfaceClass      = USB_CLASS_VIDEO,
2830           .bInterfaceSubClass   = 1,
2831           .bInterfaceProtocol   = 0,
2832           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2833         /* Syntek (Asus F9SG) */
2834         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2835                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2836           .idVendor             = 0x174f,
2837           .idProduct            = 0x8a31,
2838           .bInterfaceClass      = USB_CLASS_VIDEO,
2839           .bInterfaceSubClass   = 1,
2840           .bInterfaceProtocol   = 0,
2841           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2842         /* Syntek (Asus U3S) */
2843         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2844                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2845           .idVendor             = 0x174f,
2846           .idProduct            = 0x8a33,
2847           .bInterfaceClass      = USB_CLASS_VIDEO,
2848           .bInterfaceSubClass   = 1,
2849           .bInterfaceProtocol   = 0,
2850           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2851         /* Syntek (JAOtech Smart Terminal) */
2852         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2853                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2854           .idVendor             = 0x174f,
2855           .idProduct            = 0x8a34,
2856           .bInterfaceClass      = USB_CLASS_VIDEO,
2857           .bInterfaceSubClass   = 1,
2858           .bInterfaceProtocol   = 0,
2859           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2860         /* Miricle 307K */
2861         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2862                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2863           .idVendor             = 0x17dc,
2864           .idProduct            = 0x0202,
2865           .bInterfaceClass      = USB_CLASS_VIDEO,
2866           .bInterfaceSubClass   = 1,
2867           .bInterfaceProtocol   = 0,
2868           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2869         /* Lenovo Thinkpad SL400/SL500 */
2870         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2871                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2872           .idVendor             = 0x17ef,
2873           .idProduct            = 0x480b,
2874           .bInterfaceClass      = USB_CLASS_VIDEO,
2875           .bInterfaceSubClass   = 1,
2876           .bInterfaceProtocol   = 0,
2877           .driver_info          = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
2878         /* Aveo Technology USB 2.0 Camera */
2879         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2880                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2881           .idVendor             = 0x1871,
2882           .idProduct            = 0x0306,
2883           .bInterfaceClass      = USB_CLASS_VIDEO,
2884           .bInterfaceSubClass   = 1,
2885           .bInterfaceProtocol   = 0,
2886           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2887                                         | UVC_QUIRK_PROBE_EXTRAFIELDS) },
2888         /* Aveo Technology USB 2.0 Camera (Tasco USB Microscope) */
2889         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2890                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2891           .idVendor             = 0x1871,
2892           .idProduct            = 0x0516,
2893           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2894           .bInterfaceSubClass   = 1,
2895           .bInterfaceProtocol   = 0 },
2896         /* Ecamm Pico iMage */
2897         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2898                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2899           .idVendor             = 0x18cd,
2900           .idProduct            = 0xcafe,
2901           .bInterfaceClass      = USB_CLASS_VIDEO,
2902           .bInterfaceSubClass   = 1,
2903           .bInterfaceProtocol   = 0,
2904           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_EXTRAFIELDS) },
2905         /* Manta MM-353 Plako */
2906         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2907                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2908           .idVendor             = 0x18ec,
2909           .idProduct            = 0x3188,
2910           .bInterfaceClass      = USB_CLASS_VIDEO,
2911           .bInterfaceSubClass   = 1,
2912           .bInterfaceProtocol   = 0,
2913           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2914         /* FSC WebCam V30S */
2915         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2916                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2917           .idVendor             = 0x18ec,
2918           .idProduct            = 0x3288,
2919           .bInterfaceClass      = USB_CLASS_VIDEO,
2920           .bInterfaceSubClass   = 1,
2921           .bInterfaceProtocol   = 0,
2922           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2923         /* Arkmicro unbranded */
2924         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2925                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2926           .idVendor             = 0x18ec,
2927           .idProduct            = 0x3290,
2928           .bInterfaceClass      = USB_CLASS_VIDEO,
2929           .bInterfaceSubClass   = 1,
2930           .bInterfaceProtocol   = 0,
2931           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_def },
2932         /* The Imaging Source USB CCD cameras */
2933         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2934                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2935           .idVendor             = 0x199e,
2936           .idProduct            = 0x8102,
2937           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2938           .bInterfaceSubClass   = 1,
2939           .bInterfaceProtocol   = 0 },
2940         /* Bodelin ProScopeHR */
2941         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2942                                 | USB_DEVICE_ID_MATCH_DEV_HI
2943                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2944           .idVendor             = 0x19ab,
2945           .idProduct            = 0x1000,
2946           .bcdDevice_hi         = 0x0126,
2947           .bInterfaceClass      = USB_CLASS_VIDEO,
2948           .bInterfaceSubClass   = 1,
2949           .bInterfaceProtocol   = 0,
2950           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_STATUS_INTERVAL) },
2951         /* MSI StarCam 370i */
2952         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2953                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2954           .idVendor             = 0x1b3b,
2955           .idProduct            = 0x2951,
2956           .bInterfaceClass      = USB_CLASS_VIDEO,
2957           .bInterfaceSubClass   = 1,
2958           .bInterfaceProtocol   = 0,
2959           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2960         /* Generalplus Technology Inc. 808 Camera */
2961         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2962                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2963           .idVendor             = 0x1b3f,
2964           .idProduct            = 0x2002,
2965           .bInterfaceClass      = USB_CLASS_VIDEO,
2966           .bInterfaceSubClass   = 1,
2967           .bInterfaceProtocol   = 0,
2968           .driver_info          = (kernel_ulong_t)&uvc_quirk_probe_minmax },
2969         /* SiGma Micro USB Web Camera */
2970         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2971                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2972           .idVendor             = 0x1c4f,
2973           .idProduct            = 0x3000,
2974           .bInterfaceClass      = USB_CLASS_VIDEO,
2975           .bInterfaceSubClass   = 1,
2976           .bInterfaceProtocol   = 0,
2977           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
2978                                         | UVC_QUIRK_IGNORE_SELECTOR_UNIT) },
2979         /* Oculus VR Positional Tracker DK2 */
2980         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2981                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2982           .idVendor             = 0x2833,
2983           .idProduct            = 0x0201,
2984           .bInterfaceClass      = USB_CLASS_VIDEO,
2985           .bInterfaceSubClass   = 1,
2986           .bInterfaceProtocol   = 0,
2987           .driver_info          = (kernel_ulong_t)&uvc_quirk_force_y8 },
2988         /* Oculus VR Rift Sensor */
2989         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2990                                 | USB_DEVICE_ID_MATCH_INT_INFO,
2991           .idVendor             = 0x2833,
2992           .idProduct            = 0x0211,
2993           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
2994           .bInterfaceSubClass   = 1,
2995           .bInterfaceProtocol   = 0,
2996           .driver_info          = (kernel_ulong_t)&uvc_quirk_force_y8 },
2997         /* GEO Semiconductor GC6500 */
2998         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
2999                                 | USB_DEVICE_ID_MATCH_INT_INFO,
3000           .idVendor             = 0x29fe,
3001           .idProduct            = 0x4d53,
3002           .bInterfaceClass      = USB_CLASS_VIDEO,
3003           .bInterfaceSubClass   = 1,
3004           .bInterfaceProtocol   = 0,
3005           .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_FORCE_BPP) },
3006         /* Intel RealSense D4M */
3007         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
3008                                 | USB_DEVICE_ID_MATCH_INT_INFO,
3009           .idVendor             = 0x8086,
3010           .idProduct            = 0x0b03,
3011           .bInterfaceClass      = USB_CLASS_VIDEO,
3012           .bInterfaceSubClass   = 1,
3013           .bInterfaceProtocol   = 0,
3014           .driver_info          = UVC_INFO_META(V4L2_META_FMT_D4XX) },
3015         /* Generic USB Video Class */
3016         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_UNDEFINED) },
3017         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_15) },
3018         {}
3019 };
3020
3021 MODULE_DEVICE_TABLE(usb, uvc_ids);
3022
3023 struct uvc_driver uvc_driver = {
3024         .driver = {
3025                 .name           = "uvcvideo",
3026                 .probe          = uvc_probe,
3027                 .disconnect     = uvc_disconnect,
3028                 .suspend        = uvc_suspend,
3029                 .resume         = uvc_resume,
3030                 .reset_resume   = uvc_reset_resume,
3031                 .id_table       = uvc_ids,
3032                 .supports_autosuspend = 1,
3033         },
3034 };
3035
3036 static int __init uvc_init(void)
3037 {
3038         int ret;
3039
3040         uvc_debugfs_init();
3041
3042         ret = usb_register(&uvc_driver.driver);
3043         if (ret < 0) {
3044                 uvc_debugfs_cleanup();
3045                 return ret;
3046         }
3047
3048         printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
3049         return 0;
3050 }
3051
3052 static void __exit uvc_cleanup(void)
3053 {
3054         usb_deregister(&uvc_driver.driver);
3055         uvc_debugfs_cleanup();
3056 }
3057
3058 module_init(uvc_init);
3059 module_exit(uvc_cleanup);
3060
3061 MODULE_AUTHOR(DRIVER_AUTHOR);
3062 MODULE_DESCRIPTION(DRIVER_DESC);
3063 MODULE_LICENSE("GPL");
3064 MODULE_VERSION(DRIVER_VERSION);
3065