Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

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

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

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