drivers/media/usb/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   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/compat.h>
  15 #include <linux/kernel.h>
  16 #include <linux/version.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/videodev2.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/mm.h>
  24 #include <linux/wait.h>
  25 #include <linux/atomic.h>
  26
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-event.h>
  30 #include <media/v4l2-ioctl.h>
  31
  32 #include "uvcvideo.h"
  33
  34 /* ------------------------------------------------------------------------
  35  * UVC ioctls
  36  */
  37 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
  38         struct uvc_xu_control_mapping *xmap)
  39 {
  40         struct uvc_control_mapping *map;
  41         unsigned int size;
  42         int ret;
  43
  44         map = kzalloc(sizeof *map, GFP_KERNEL);
  45         if (map == NULL)
  46                 return -ENOMEM;
  47
  48         map->id = xmap->id;
  49         memcpy(map->name, xmap->name, sizeof map->name);
  50         memcpy(map->entity, xmap->entity, sizeof map->entity);
  51         map->selector = xmap->selector;
  52         map->size = xmap->size;
  53         map->offset = xmap->offset;
  54         map->v4l2_type = xmap->v4l2_type;
  55         map->data_type = xmap->data_type;
  56
  57         switch (xmap->v4l2_type) {
  58         case V4L2_CTRL_TYPE_INTEGER:
  59         case V4L2_CTRL_TYPE_BOOLEAN:
  60         case V4L2_CTRL_TYPE_BUTTON:
  61                 break;
  62
  63         case V4L2_CTRL_TYPE_MENU:
  64                 /* Prevent excessive memory consumption, as well as integer
  65                  * overflows.
  66                  */
  67                 if (xmap->menu_count == 0 ||
  68                     xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
  69                         ret = -EINVAL;
  70                         goto done;
  71                 }
  72
  73                 size = xmap->menu_count * sizeof(*map->menu_info);
  74                 map->menu_info = kmalloc(size, GFP_KERNEL);
  75                 if (map->menu_info == NULL) {
  76                         ret = -ENOMEM;
  77                         goto done;
  78                 }
  79
  80                 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
  81                         ret = -EFAULT;
  82                         goto done;
  83                 }
  84
  85                 map->menu_count = xmap->menu_count;
  86                 break;
  87
  88         default:
  89                 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
  90                           "%u.\n", xmap->v4l2_type);
  91                 ret = -ENOTTY;
  92                 goto done;
  93         }
  94
  95         ret = uvc_ctrl_add_mapping(chain, map);
  96
  97 done:
  98         kfree(map->menu_info);
  99         kfree(map);
 100
 101         return ret;
 102 }
 103
 104 /* ------------------------------------------------------------------------
 105  * V4L2 interface
 106  */
 107
 108 /*
 109  * Find the frame interval closest to the requested frame interval for the
 110  * given frame format and size. This should be done by the device as part of
 111  * the Video Probe and Commit negotiation, but some hardware don't implement
 112  * that feature.
 113  */
 114 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
 115 {
 116         unsigned int i;
 117
 118         if (frame->bFrameIntervalType) {
 119                 __u32 best = -1, dist;
 120
 121                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 122                         dist = interval > frame->dwFrameInterval[i]
 123                              ? interval - frame->dwFrameInterval[i]
 124                              : frame->dwFrameInterval[i] - interval;
 125
 126                         if (dist > best)
 127                                 break;
 128
 129                         best = dist;
 130                 }
 131
 132                 interval = frame->dwFrameInterval[i-1];
 133         } else {
 134                 const __u32 min = frame->dwFrameInterval[0];
 135                 const __u32 max = frame->dwFrameInterval[1];
 136                 const __u32 step = frame->dwFrameInterval[2];
 137
 138                 interval = min + (interval - min + step/2) / step * step;
 139                 if (interval > max)
 140                         interval = max;
 141         }
 142
 143         return interval;
 144 }
 145
 146 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 147         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 148         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 149 {
 150         struct uvc_format *format = NULL;
 151         struct uvc_frame *frame = NULL;
 152         __u16 rw, rh;
 153         unsigned int d, maxd;
 154         unsigned int i;
 155         __u32 interval;
 156         int ret = 0;
 157         __u8 *fcc;
 158
 159         if (fmt->type != stream->type)
 160                 return -EINVAL;
 161
 162         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 163         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 164                         fmt->fmt.pix.pixelformat,
 165                         fcc[0], fcc[1], fcc[2], fcc[3],
 166                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 167
 168         /* Check if the hardware supports the requested format, use the default
 169          * format otherwise.
 170          */
 171         for (i = 0; i < stream->nformats; ++i) {
 172                 format = &stream->format[i];
 173                 if (format->fcc == fmt->fmt.pix.pixelformat)
 174                         break;
 175         }
 176
 177         if (i == stream->nformats) {
 178                 format = stream->def_format;
 179                 fmt->fmt.pix.pixelformat = format->fcc;
 180         }
 181
 182         /* Find the closest image size. The distance between image sizes is
 183          * the size in pixels of the non-overlapping regions between the
 184          * requested size and the frame-specified size.
 185          */
 186         rw = fmt->fmt.pix.width;
 187         rh = fmt->fmt.pix.height;
 188         maxd = (unsigned int)-1;
 189
 190         for (i = 0; i < format->nframes; ++i) {
 191                 __u16 w = format->frame[i].wWidth;
 192                 __u16 h = format->frame[i].wHeight;
 193
 194                 d = min(w, rw) * min(h, rh);
 195                 d = w*h + rw*rh - 2*d;
 196                 if (d < maxd) {
 197                         maxd = d;
 198                         frame = &format->frame[i];
 199                 }
 200
 201                 if (maxd == 0)
 202                         break;
 203         }
 204
 205         if (frame == NULL) {
 206                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 207                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 208                 return -EINVAL;
 209         }
 210
 211         /* Use the default frame interval. */
 212         interval = frame->dwDefaultFrameInterval;
 213         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 214                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 215                 (100000000/interval)%10);
 216
 217         /* Set the format index, frame index and frame interval. */
 218         memset(probe, 0, sizeof *probe);
 219         probe->bmHint = 1;      /* dwFrameInterval */
 220         probe->bFormatIndex = format->index;
 221         probe->bFrameIndex = frame->bFrameIndex;
 222         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 223         /* Some webcams stall the probe control set request when the
 224          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 225          * clearly states that the field is read-only from the host, so this
 226          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 227          * the webcam to work around the problem.
 228          *
 229          * The workaround could probably be enabled for all webcams, so the
 230          * quirk can be removed if needed. It's currently useful to detect
 231          * webcam bugs and fix them before they hit the market (providing
 232          * developers test their webcams with the Linux driver as well as with
 233          * the Windows driver).
 234          */
 235         mutex_lock(&stream->mutex);
 236         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 237                 probe->dwMaxVideoFrameSize =
 238                         stream->ctrl.dwMaxVideoFrameSize;
 239
 240         /* Probe the device. */
 241         ret = uvc_probe_video(stream, probe);
 242         mutex_unlock(&stream->mutex);
 243         if (ret < 0)
 244                 goto done;
 245
 246         fmt->fmt.pix.width = frame->wWidth;
 247         fmt->fmt.pix.height = frame->wHeight;
 248         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 249         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 250         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 251         fmt->fmt.pix.colorspace = format->colorspace;
 252         fmt->fmt.pix.priv = 0;
 253
 254         if (uvc_format != NULL)
 255                 *uvc_format = format;
 256         if (uvc_frame != NULL)
 257                 *uvc_frame = frame;
 258
 259 done:
 260         return ret;
 261 }
 262
 263 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 264         struct v4l2_format *fmt)
 265 {
 266         struct uvc_format *format;
 267         struct uvc_frame *frame;
 268         int ret = 0;
 269
 270         if (fmt->type != stream->type)
 271                 return -EINVAL;
 272
 273         mutex_lock(&stream->mutex);
 274         format = stream->cur_format;
 275         frame = stream->cur_frame;
 276
 277         if (format == NULL || frame == NULL) {
 278                 ret = -EINVAL;
 279                 goto done;
 280         }
 281
 282         fmt->fmt.pix.pixelformat = format->fcc;
 283         fmt->fmt.pix.width = frame->wWidth;
 284         fmt->fmt.pix.height = frame->wHeight;
 285         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 286         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 287         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 288         fmt->fmt.pix.colorspace = format->colorspace;
 289         fmt->fmt.pix.priv = 0;
 290
 291 done:
 292         mutex_unlock(&stream->mutex);
 293         return ret;
 294 }
 295
 296 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 297         struct v4l2_format *fmt)
 298 {
 299         struct uvc_streaming_control probe;
 300         struct uvc_format *format;
 301         struct uvc_frame *frame;
 302         int ret;
 303
 304         if (fmt->type != stream->type)
 305                 return -EINVAL;
 306
 307         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 308         if (ret < 0)
 309                 return ret;
 310
 311         mutex_lock(&stream->mutex);
 312
 313         if (uvc_queue_allocated(&stream->queue)) {
 314                 ret = -EBUSY;
 315                 goto done;
 316         }
 317
 318         stream->ctrl = probe;
 319         stream->cur_format = format;
 320         stream->cur_frame = frame;
 321         stream->frame_size = fmt->fmt.pix.sizeimage;
 322
 323 done:
 324         mutex_unlock(&stream->mutex);
 325         return ret;
 326 }
 327
 328 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 329                 struct v4l2_streamparm *parm)
 330 {
 331         uint32_t numerator, denominator;
 332
 333         if (parm->type != stream->type)
 334                 return -EINVAL;
 335
 336         mutex_lock(&stream->mutex);
 337         numerator = stream->ctrl.dwFrameInterval;
 338         mutex_unlock(&stream->mutex);
 339
 340         denominator = 10000000;
 341         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 342
 343         memset(parm, 0, sizeof *parm);
 344         parm->type = stream->type;
 345
 346         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 347                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 348                 parm->parm.capture.capturemode = 0;
 349                 parm->parm.capture.timeperframe.numerator = numerator;
 350                 parm->parm.capture.timeperframe.denominator = denominator;
 351                 parm->parm.capture.extendedmode = 0;
 352                 parm->parm.capture.readbuffers = 0;
 353         } else {
 354                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 355                 parm->parm.output.outputmode = 0;
 356                 parm->parm.output.timeperframe.numerator = numerator;
 357                 parm->parm.output.timeperframe.denominator = denominator;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 364                 struct v4l2_streamparm *parm)
 365 {
 366         struct uvc_streaming_control probe;
 367         struct v4l2_fract timeperframe;
 368         uint32_t interval;
 369         int ret;
 370
 371         if (parm->type != stream->type)
 372                 return -EINVAL;
 373
 374         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 375                 timeperframe = parm->parm.capture.timeperframe;
 376         else
 377                 timeperframe = parm->parm.output.timeperframe;
 378
 379         interval = uvc_fraction_to_interval(timeperframe.numerator,
 380                 timeperframe.denominator);
 381         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 382                 timeperframe.numerator, timeperframe.denominator, interval);
 383
 384         mutex_lock(&stream->mutex);
 385
 386         if (uvc_queue_streaming(&stream->queue)) {
 387                 mutex_unlock(&stream->mutex);
 388                 return -EBUSY;
 389         }
 390
 391         probe = stream->ctrl;
 392         probe.dwFrameInterval =
 393                 uvc_try_frame_interval(stream->cur_frame, interval);
 394
 395         /* Probe the device with the new settings. */
 396         ret = uvc_probe_video(stream, &probe);
 397         if (ret < 0) {
 398                 mutex_unlock(&stream->mutex);
 399                 return ret;
 400         }
 401
 402         stream->ctrl = probe;
 403         mutex_unlock(&stream->mutex);
 404
 405         /* Return the actual frame period. */
 406         timeperframe.numerator = probe.dwFrameInterval;
 407         timeperframe.denominator = 10000000;
 408         uvc_simplify_fraction(&timeperframe.numerator,
 409                 &timeperframe.denominator, 8, 333);
 410
 411         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 412                 parm->parm.capture.timeperframe = timeperframe;
 413         else
 414                 parm->parm.output.timeperframe = timeperframe;
 415
 416         return 0;
 417 }
 418
 419 /* ------------------------------------------------------------------------
 420  * Privilege management
 421  */
 422
 423 /*
 424  * Privilege management is the multiple-open implementation basis. The current
 425  * implementation is completely transparent for the end-user and doesn't
 426  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 427  * Those ioctls enable finer control on the device (by making possible for a
 428  * user to request exclusive access to a device), but are not mature yet.
 429  * Switching to the V4L2 priority mechanism might be considered in the future
 430  * if this situation changes.
 431  *
 432  * Each open instance of a UVC device can either be in a privileged or
 433  * unprivileged state. Only a single instance can be in a privileged state at
 434  * a given time. Trying to perform an operation that requires privileges will
 435  * automatically acquire the required privileges if possible, or return -EBUSY
 436  * otherwise. Privileges are dismissed when closing the instance or when
 437  * freeing the video buffers using VIDIOC_REQBUFS.
 438  *
 439  * Operations that require privileges are:
 440  *
 441  * - VIDIOC_S_INPUT
 442  * - VIDIOC_S_PARM
 443  * - VIDIOC_S_FMT
 444  * - VIDIOC_REQBUFS
 445  */
 446 static int uvc_acquire_privileges(struct uvc_fh *handle)
 447 {
 448         /* Always succeed if the handle is already privileged. */
 449         if (handle->state == UVC_HANDLE_ACTIVE)
 450                 return 0;
 451
 452         /* Check if the device already has a privileged handle. */
 453         if (atomic_inc_return(&handle->stream->active) != 1) {
 454                 atomic_dec(&handle->stream->active);
 455                 return -EBUSY;
 456         }
 457
 458         handle->state = UVC_HANDLE_ACTIVE;
 459         return 0;
 460 }
 461
 462 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 463 {
 464         if (handle->state == UVC_HANDLE_ACTIVE)
 465                 atomic_dec(&handle->stream->active);
 466
 467         handle->state = UVC_HANDLE_PASSIVE;
 468 }
 469
 470 static int uvc_has_privileges(struct uvc_fh *handle)
 471 {
 472         return handle->state == UVC_HANDLE_ACTIVE;
 473 }
 474
 475 /* ------------------------------------------------------------------------
 476  * V4L2 file operations
 477  */
 478
 479 static int uvc_v4l2_open(struct file *file)
 480 {
 481         struct uvc_streaming *stream;
 482         struct uvc_fh *handle;
 483         int ret = 0;
 484
 485         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 486         stream = video_drvdata(file);
 487
 488         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 489                 return -ENODEV;
 490
 491         ret = usb_autopm_get_interface(stream->dev->intf);
 492         if (ret < 0)
 493                 return ret;
 494
 495         /* Create the device handle. */
 496         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 497         if (handle == NULL) {
 498                 usb_autopm_put_interface(stream->dev->intf);
 499                 return -ENOMEM;
 500         }
 501
 502         mutex_lock(&stream->dev->lock);
 503         if (stream->dev->users == 0) {
 504                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 505                 if (ret < 0) {
 506                         mutex_unlock(&stream->dev->lock);
 507                         usb_autopm_put_interface(stream->dev->intf);
 508                         kfree(handle);
 509                         return ret;
 510                 }
 511         }
 512
 513         stream->dev->users++;
 514         mutex_unlock(&stream->dev->lock);
 515
 516         v4l2_fh_init(&handle->vfh, stream->vdev);
 517         v4l2_fh_add(&handle->vfh);
 518         handle->chain = stream->chain;
 519         handle->stream = stream;
 520         handle->state = UVC_HANDLE_PASSIVE;
 521         file->private_data = handle;
 522
 523         return 0;
 524 }
 525
 526 static int uvc_v4l2_release(struct file *file)
 527 {
 528         struct uvc_fh *handle = file->private_data;
 529         struct uvc_streaming *stream = handle->stream;
 530
 531         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 532
 533         /* Only free resources if this is a privileged handle. */
 534         if (uvc_has_privileges(handle)) {
 535                 uvc_video_enable(stream, 0);
 536                 uvc_free_buffers(&stream->queue);
 537         }
 538
 539         /* Release the file handle. */
 540         uvc_dismiss_privileges(handle);
 541         v4l2_fh_del(&handle->vfh);
 542         v4l2_fh_exit(&handle->vfh);
 543         kfree(handle);
 544         file->private_data = NULL;
 545
 546         mutex_lock(&stream->dev->lock);
 547         if (--stream->dev->users == 0)
 548                 uvc_status_stop(stream->dev);
 549         mutex_unlock(&stream->dev->lock);
 550
 551         usb_autopm_put_interface(stream->dev->intf);
 552         return 0;
 553 }
 554
 555 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 556 {
 557         struct video_device *vdev = video_devdata(file);
 558         struct uvc_fh *handle = file->private_data;
 559         struct uvc_video_chain *chain = handle->chain;
 560         struct uvc_streaming *stream = handle->stream;
 561         long ret = 0;
 562
 563         switch (cmd) {
 564         /* Query capabilities */
 565         case VIDIOC_QUERYCAP:
 566         {
 567                 struct v4l2_capability *cap = arg;
 568
 569                 memset(cap, 0, sizeof *cap);
 570                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 571                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 572                 usb_make_path(stream->dev->udev,
 573                               cap->bus_info, sizeof(cap->bus_info));
 574                 cap->version = LINUX_VERSION_CODE;
 575                 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 576                                   | chain->caps;
 577                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 578                         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
 579                                          | V4L2_CAP_STREAMING;
 580                 else
 581                         cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
 582                                          | V4L2_CAP_STREAMING;
 583                 break;
 584         }
 585
 586         /* Priority */
 587         case VIDIOC_G_PRIORITY:
 588                 *(u32 *)arg = v4l2_prio_max(vdev->prio);
 589                 break;
 590
 591         case VIDIOC_S_PRIORITY:
 592                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 593                 if (ret < 0)
 594                         return ret;
 595
 596                 return v4l2_prio_change(vdev->prio, &handle->vfh.prio,
 597                                         *(u32 *)arg);
 598
 599         /* Get, Set & Query control */
 600         case VIDIOC_QUERYCTRL:
 601                 return uvc_query_v4l2_ctrl(chain, arg);
 602
 603         case VIDIOC_G_CTRL:
 604         {
 605                 struct v4l2_control *ctrl = arg;
 606                 struct v4l2_ext_control xctrl;
 607
 608                 memset(&xctrl, 0, sizeof xctrl);
 609                 xctrl.id = ctrl->id;
 610
 611                 ret = uvc_ctrl_begin(chain);
 612                 if (ret < 0)
 613                         return ret;
 614
 615                 ret = uvc_ctrl_get(chain, &xctrl);
 616                 uvc_ctrl_rollback(handle);
 617                 if (ret >= 0)
 618                         ctrl->value = xctrl.value;
 619                 break;
 620         }
 621
 622         case VIDIOC_S_CTRL:
 623         {
 624                 struct v4l2_control *ctrl = arg;
 625                 struct v4l2_ext_control xctrl;
 626
 627                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 628                 if (ret < 0)
 629                         return ret;
 630
 631                 memset(&xctrl, 0, sizeof xctrl);
 632                 xctrl.id = ctrl->id;
 633                 xctrl.value = ctrl->value;
 634
 635                 ret = uvc_ctrl_begin(chain);
 636                 if (ret < 0)
 637                         return ret;
 638
 639                 ret = uvc_ctrl_set(chain, &xctrl);
 640                 if (ret < 0) {
 641                         uvc_ctrl_rollback(handle);
 642                         return ret;
 643                 }
 644                 ret = uvc_ctrl_commit(handle, &xctrl, 1);
 645                 if (ret == 0)
 646                         ctrl->value = xctrl.value;
 647                 break;
 648         }
 649
 650         case VIDIOC_QUERYMENU:
 651                 return uvc_query_v4l2_menu(chain, arg);
 652
 653         case VIDIOC_G_EXT_CTRLS:
 654         {
 655                 struct v4l2_ext_controls *ctrls = arg;
 656                 struct v4l2_ext_control *ctrl = ctrls->controls;
 657                 unsigned int i;
 658
 659                 ret = uvc_ctrl_begin(chain);
 660                 if (ret < 0)
 661                         return ret;
 662
 663                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 664                         ret = uvc_ctrl_get(chain, ctrl);
 665                         if (ret < 0) {
 666                                 uvc_ctrl_rollback(handle);
 667                                 ctrls->error_idx = i;
 668                                 return ret;
 669                         }
 670                 }
 671                 ctrls->error_idx = 0;
 672                 ret = uvc_ctrl_rollback(handle);
 673                 break;
 674         }
 675
 676         case VIDIOC_S_EXT_CTRLS:
 677                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 678                 if (ret < 0)
 679                         return ret;
 680                 /* Fall through */
 681         case VIDIOC_TRY_EXT_CTRLS:
 682         {
 683                 struct v4l2_ext_controls *ctrls = arg;
 684                 struct v4l2_ext_control *ctrl = ctrls->controls;
 685                 unsigned int i;
 686
 687                 ret = uvc_ctrl_begin(chain);
 688                 if (ret < 0)
 689                         return ret;
 690
 691                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 692                         ret = uvc_ctrl_set(chain, ctrl);
 693                         if (ret < 0) {
 694                                 uvc_ctrl_rollback(handle);
 695                                 ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
 696                                                  ? ctrls->count : i;
 697                                 return ret;
 698                         }
 699                 }
 700
 701                 ctrls->error_idx = 0;
 702
 703                 if (cmd == VIDIOC_S_EXT_CTRLS)
 704                         ret = uvc_ctrl_commit(handle,
 705                                               ctrls->controls, ctrls->count);
 706                 else
 707                         ret = uvc_ctrl_rollback(handle);
 708                 break;
 709         }
 710
 711         /* Get, Set & Enum input */
 712         case VIDIOC_ENUMINPUT:
 713         {
 714                 const struct uvc_entity *selector = chain->selector;
 715                 struct v4l2_input *input = arg;
 716                 struct uvc_entity *iterm = NULL;
 717                 u32 index = input->index;
 718                 int pin = 0;
 719
 720                 if (selector == NULL ||
 721                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 722                         if (index != 0)
 723                                 return -EINVAL;
 724                         list_for_each_entry(iterm, &chain->entities, chain) {
 725                                 if (UVC_ENTITY_IS_ITERM(iterm))
 726                                         break;
 727                         }
 728                         pin = iterm->id;
 729                 } else if (index < selector->bNrInPins) {
 730                         pin = selector->baSourceID[index];
 731                         list_for_each_entry(iterm, &chain->entities, chain) {
 732                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 733                                         continue;
 734                                 if (iterm->id == pin)
 735                                         break;
 736                         }
 737                 }
 738
 739                 if (iterm == NULL || iterm->id != pin)
 740                         return -EINVAL;
 741
 742                 memset(input, 0, sizeof *input);
 743                 input->index = index;
 744                 strlcpy(input->name, iterm->name, sizeof input->name);
 745                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 746                         input->type = V4L2_INPUT_TYPE_CAMERA;
 747                 break;
 748         }
 749
 750         case VIDIOC_G_INPUT:
 751         {
 752                 u8 input;
 753
 754                 if (chain->selector == NULL ||
 755                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 756                         *(int *)arg = 0;
 757                         break;
 758                 }
 759
 760                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 761                         chain->selector->id, chain->dev->intfnum,
 762                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 763                 if (ret < 0)
 764                         return ret;
 765
 766                 *(int *)arg = input - 1;
 767                 break;
 768         }
 769
 770         case VIDIOC_S_INPUT:
 771         {
 772                 u32 input = *(u32 *)arg + 1;
 773
 774                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 775                 if (ret < 0)
 776                         return ret;
 777
 778                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 779                         return ret;
 780
 781                 if (chain->selector == NULL ||
 782                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 783                         if (input != 1)
 784                                 return -EINVAL;
 785                         break;
 786                 }
 787
 788                 if (input == 0 || input > chain->selector->bNrInPins)
 789                         return -EINVAL;
 790
 791                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 792                         chain->selector->id, chain->dev->intfnum,
 793                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 794         }
 795
 796         /* Try, Get, Set & Enum format */
 797         case VIDIOC_ENUM_FMT:
 798         {
 799                 struct v4l2_fmtdesc *fmt = arg;
 800                 struct uvc_format *format;
 801                 enum v4l2_buf_type type = fmt->type;
 802                 __u32 index = fmt->index;
 803
 804                 if (fmt->type != stream->type ||
 805                     fmt->index >= stream->nformats)
 806                         return -EINVAL;
 807
 808                 memset(fmt, 0, sizeof(*fmt));
 809                 fmt->index = index;
 810                 fmt->type = type;
 811
 812                 format = &stream->format[fmt->index];
 813                 fmt->flags = 0;
 814                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 815                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 816                 strlcpy(fmt->description, format->name,
 817                         sizeof fmt->description);
 818                 fmt->description[sizeof fmt->description - 1] = 0;
 819                 fmt->pixelformat = format->fcc;
 820                 break;
 821         }
 822
 823         case VIDIOC_TRY_FMT:
 824         {
 825                 struct uvc_streaming_control probe;
 826
 827                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 828         }
 829
 830         case VIDIOC_S_FMT:
 831                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 832                 if (ret < 0)
 833                         return ret;
 834
 835                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 836                         return ret;
 837
 838                 return uvc_v4l2_set_format(stream, arg);
 839
 840         case VIDIOC_G_FMT:
 841                 return uvc_v4l2_get_format(stream, arg);
 842
 843         /* Frame size enumeration */
 844         case VIDIOC_ENUM_FRAMESIZES:
 845         {
 846                 struct v4l2_frmsizeenum *fsize = arg;
 847                 struct uvc_format *format = NULL;
 848                 struct uvc_frame *frame;
 849                 int i;
 850
 851                 /* Look for the given pixel format */
 852                 for (i = 0; i < stream->nformats; i++) {
 853                         if (stream->format[i].fcc ==
 854                                         fsize->pixel_format) {
 855                                 format = &stream->format[i];
 856                                 break;
 857                         }
 858                 }
 859                 if (format == NULL)
 860                         return -EINVAL;
 861
 862                 if (fsize->index >= format->nframes)
 863                         return -EINVAL;
 864
 865                 frame = &format->frame[fsize->index];
 866                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 867                 fsize->discrete.width = frame->wWidth;
 868                 fsize->discrete.height = frame->wHeight;
 869                 break;
 870         }
 871
 872         /* Frame interval enumeration */
 873         case VIDIOC_ENUM_FRAMEINTERVALS:
 874         {
 875                 struct v4l2_frmivalenum *fival = arg;
 876                 struct uvc_format *format = NULL;
 877                 struct uvc_frame *frame = NULL;
 878                 int i;
 879
 880                 /* Look for the given pixel format and frame size */
 881                 for (i = 0; i < stream->nformats; i++) {
 882                         if (stream->format[i].fcc ==
 883                                         fival->pixel_format) {
 884                                 format = &stream->format[i];
 885                                 break;
 886                         }
 887                 }
 888                 if (format == NULL)
 889                         return -EINVAL;
 890
 891                 for (i = 0; i < format->nframes; i++) {
 892                         if (format->frame[i].wWidth == fival->width &&
 893                             format->frame[i].wHeight == fival->height) {
 894                                 frame = &format->frame[i];
 895                                 break;
 896                         }
 897                 }
 898                 if (frame == NULL)
 899                         return -EINVAL;
 900
 901                 if (frame->bFrameIntervalType) {
 902                         if (fival->index >= frame->bFrameIntervalType)
 903                                 return -EINVAL;
 904
 905                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 906                         fival->discrete.numerator =
 907                                 frame->dwFrameInterval[fival->index];
 908                         fival->discrete.denominator = 10000000;
 909                         uvc_simplify_fraction(&fival->discrete.numerator,
 910                                 &fival->discrete.denominator, 8, 333);
 911                 } else {
 912                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 913                         fival->stepwise.min.numerator =
 914                                 frame->dwFrameInterval[0];
 915                         fival->stepwise.min.denominator = 10000000;
 916                         fival->stepwise.max.numerator =
 917                                 frame->dwFrameInterval[1];
 918                         fival->stepwise.max.denominator = 10000000;
 919                         fival->stepwise.step.numerator =
 920                                 frame->dwFrameInterval[2];
 921                         fival->stepwise.step.denominator = 10000000;
 922                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 923                                 &fival->stepwise.min.denominator, 8, 333);
 924                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 925                                 &fival->stepwise.max.denominator, 8, 333);
 926                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 927                                 &fival->stepwise.step.denominator, 8, 333);
 928                 }
 929                 break;
 930         }
 931
 932         /* Get & Set streaming parameters */
 933         case VIDIOC_G_PARM:
 934                 return uvc_v4l2_get_streamparm(stream, arg);
 935
 936         case VIDIOC_S_PARM:
 937                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 938                 if (ret < 0)
 939                         return ret;
 940
 941                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 942                         return ret;
 943
 944                 return uvc_v4l2_set_streamparm(stream, arg);
 945
 946         /* Cropping and scaling */
 947         case VIDIOC_CROPCAP:
 948         {
 949                 struct v4l2_cropcap *ccap = arg;
 950
 951                 if (ccap->type != stream->type)
 952                         return -EINVAL;
 953
 954                 ccap->bounds.left = 0;
 955                 ccap->bounds.top = 0;
 956
 957                 mutex_lock(&stream->mutex);
 958                 ccap->bounds.width = stream->cur_frame->wWidth;
 959                 ccap->bounds.height = stream->cur_frame->wHeight;
 960                 mutex_unlock(&stream->mutex);
 961
 962                 ccap->defrect = ccap->bounds;
 963
 964                 ccap->pixelaspect.numerator = 1;
 965                 ccap->pixelaspect.denominator = 1;
 966                 break;
 967         }
 968
 969         case VIDIOC_G_CROP:
 970         case VIDIOC_S_CROP:
 971                 return -ENOTTY;
 972
 973         /* Buffers & streaming */
 974         case VIDIOC_REQBUFS:
 975                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 976                 if (ret < 0)
 977                         return ret;
 978
 979                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 980                         return ret;
 981
 982                 mutex_lock(&stream->mutex);
 983                 ret = uvc_alloc_buffers(&stream->queue, arg);
 984                 mutex_unlock(&stream->mutex);
 985                 if (ret < 0)
 986                         return ret;
 987
 988                 if (ret == 0)
 989                         uvc_dismiss_privileges(handle);
 990
 991                 ret = 0;
 992                 break;
 993
 994         case VIDIOC_QUERYBUF:
 995         {
 996                 struct v4l2_buffer *buf = arg;
 997
 998                 if (!uvc_has_privileges(handle))
 999                         return -EBUSY;
1000
1001                 return uvc_query_buffer(&stream->queue, buf);
1002         }
1003
1004         case VIDIOC_CREATE_BUFS:
1005         {
1006                 struct v4l2_create_buffers *cb = arg;
1007
1008                 ret = uvc_acquire_privileges(handle);
1009                 if (ret < 0)
1010                         return ret;
1011
1012                 return uvc_create_buffers(&stream->queue, cb);
1013         }
1014
1015         case VIDIOC_QBUF:
1016                 if (!uvc_has_privileges(handle))
1017                         return -EBUSY;
1018
1019                 return uvc_queue_buffer(&stream->queue, arg);
1020
1021         case VIDIOC_DQBUF:
1022                 if (!uvc_has_privileges(handle))
1023                         return -EBUSY;
1024
1025                 return uvc_dequeue_buffer(&stream->queue, arg,
1026                         file->f_flags & O_NONBLOCK);
1027
1028         case VIDIOC_STREAMON:
1029         {
1030                 int *type = arg;
1031
1032                 if (*type != stream->type)
1033                         return -EINVAL;
1034
1035                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1036                 if (ret < 0)
1037                         return ret;
1038
1039                 if (!uvc_has_privileges(handle))
1040                         return -EBUSY;
1041
1042                 mutex_lock(&stream->mutex);
1043                 ret = uvc_video_enable(stream, 1);
1044                 mutex_unlock(&stream->mutex);
1045                 if (ret < 0)
1046                         return ret;
1047                 break;
1048         }
1049
1050         case VIDIOC_STREAMOFF:
1051         {
1052                 int *type = arg;
1053
1054                 if (*type != stream->type)
1055                         return -EINVAL;
1056
1057                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1058                 if (ret < 0)
1059                         return ret;
1060
1061                 if (!uvc_has_privileges(handle))
1062                         return -EBUSY;
1063
1064                 return uvc_video_enable(stream, 0);
1065         }
1066
1067         case VIDIOC_SUBSCRIBE_EVENT:
1068         {
1069                 struct v4l2_event_subscription *sub = arg;
1070
1071                 switch (sub->type) {
1072                 case V4L2_EVENT_CTRL:
1073                         return v4l2_event_subscribe(&handle->vfh, sub, 0,
1074                                                     &uvc_ctrl_sub_ev_ops);
1075                 default:
1076                         return -EINVAL;
1077                 }
1078         }
1079
1080         case VIDIOC_UNSUBSCRIBE_EVENT:
1081                 return v4l2_event_unsubscribe(&handle->vfh, arg);
1082
1083         case VIDIOC_DQEVENT:
1084                 return v4l2_event_dequeue(&handle->vfh, arg,
1085                                           file->f_flags & O_NONBLOCK);
1086
1087         /* Analog video standards make no sense for digital cameras. */
1088         case VIDIOC_ENUMSTD:
1089         case VIDIOC_QUERYSTD:
1090         case VIDIOC_G_STD:
1091         case VIDIOC_S_STD:
1092
1093         case VIDIOC_OVERLAY:
1094
1095         case VIDIOC_ENUMAUDIO:
1096         case VIDIOC_ENUMAUDOUT:
1097
1098         case VIDIOC_ENUMOUTPUT:
1099                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1100                 return -ENOTTY;
1101
1102         case UVCIOC_CTRL_MAP:
1103                 return uvc_ioctl_ctrl_map(chain, arg);
1104
1105         case UVCIOC_CTRL_QUERY:
1106                 return uvc_xu_ctrl_query(chain, arg);
1107
1108         default:
1109                 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1110                 return -ENOTTY;
1111         }
1112
1113         return ret;
1114 }
1115
1116 static long uvc_v4l2_ioctl(struct file *file,
1117                      unsigned int cmd, unsigned long arg)
1118 {
1119         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1120                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1121                 v4l_printk_ioctl(NULL, cmd);
1122                 printk(")\n");
1123         }
1124
1125         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1126 }
1127
1128 #ifdef CONFIG_COMPAT
1129 struct uvc_xu_control_mapping32 {
1130         __u32 id;
1131         __u8 name[32];
1132         __u8 entity[16];
1133         __u8 selector;
1134
1135         __u8 size;
1136         __u8 offset;
1137         __u32 v4l2_type;
1138         __u32 data_type;
1139
1140         compat_caddr_t menu_info;
1141         __u32 menu_count;
1142
1143         __u32 reserved[4];
1144 };
1145
1146 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1147                         const struct uvc_xu_control_mapping32 __user *up)
1148 {
1149         struct uvc_menu_info __user *umenus;
1150         struct uvc_menu_info __user *kmenus;
1151         compat_caddr_t p;
1152
1153         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1154             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1155             __get_user(kp->menu_count, &up->menu_count))
1156                 return -EFAULT;
1157
1158         memset(kp->reserved, 0, sizeof(kp->reserved));
1159
1160         if (kp->menu_count == 0) {
1161                 kp->menu_info = NULL;
1162                 return 0;
1163         }
1164
1165         if (__get_user(p, &up->menu_info))
1166                 return -EFAULT;
1167         umenus = compat_ptr(p);
1168         if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1169                 return -EFAULT;
1170
1171         kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1172         if (kmenus == NULL)
1173                 return -EFAULT;
1174         kp->menu_info = kmenus;
1175
1176         if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1177                 return -EFAULT;
1178
1179         return 0;
1180 }
1181
1182 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1183                         struct uvc_xu_control_mapping32 __user *up)
1184 {
1185         struct uvc_menu_info __user *umenus;
1186         struct uvc_menu_info __user *kmenus = kp->menu_info;
1187         compat_caddr_t p;
1188
1189         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1190             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1191             __put_user(kp->menu_count, &up->menu_count))
1192                 return -EFAULT;
1193
1194         if (__clear_user(up->reserved, sizeof(up->reserved)))
1195                 return -EFAULT;
1196
1197         if (kp->menu_count == 0)
1198                 return 0;
1199
1200         if (get_user(p, &up->menu_info))
1201                 return -EFAULT;
1202         umenus = compat_ptr(p);
1203
1204         if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1205                 return -EFAULT;
1206
1207         return 0;
1208 }
1209
1210 struct uvc_xu_control_query32 {
1211         __u8 unit;
1212         __u8 selector;
1213         __u8 query;
1214         __u16 size;
1215         compat_caddr_t data;
1216 };
1217
1218 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1219                         const struct uvc_xu_control_query32 __user *up)
1220 {
1221         u8 __user *udata;
1222         u8 __user *kdata;
1223         compat_caddr_t p;
1224
1225         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1226             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1227                 return -EFAULT;
1228
1229         if (kp->size == 0) {
1230                 kp->data = NULL;
1231                 return 0;
1232         }
1233
1234         if (__get_user(p, &up->data))
1235                 return -EFAULT;
1236         udata = compat_ptr(p);
1237         if (!access_ok(VERIFY_READ, udata, kp->size))
1238                 return -EFAULT;
1239
1240         kdata = compat_alloc_user_space(kp->size);
1241         if (kdata == NULL)
1242                 return -EFAULT;
1243         kp->data = kdata;
1244
1245         if (copy_in_user(kdata, udata, kp->size))
1246                 return -EFAULT;
1247
1248         return 0;
1249 }
1250
1251 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1252                         struct uvc_xu_control_query32 __user *up)
1253 {
1254         u8 __user *udata;
1255         u8 __user *kdata = kp->data;
1256         compat_caddr_t p;
1257
1258         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1259             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1260                 return -EFAULT;
1261
1262         if (kp->size == 0)
1263                 return 0;
1264
1265         if (get_user(p, &up->data))
1266                 return -EFAULT;
1267         udata = compat_ptr(p);
1268         if (!access_ok(VERIFY_READ, udata, kp->size))
1269                 return -EFAULT;
1270
1271         if (copy_in_user(udata, kdata, kp->size))
1272                 return -EFAULT;
1273
1274         return 0;
1275 }
1276
1277 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1278 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1279
1280 static long uvc_v4l2_compat_ioctl32(struct file *file,
1281                      unsigned int cmd, unsigned long arg)
1282 {
1283         union {
1284                 struct uvc_xu_control_mapping xmap;
1285                 struct uvc_xu_control_query xqry;
1286         } karg;
1287         void __user *up = compat_ptr(arg);
1288         mm_segment_t old_fs;
1289         long ret;
1290
1291         switch (cmd) {
1292         case UVCIOC_CTRL_MAP32:
1293                 cmd = UVCIOC_CTRL_MAP;
1294                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1295                 break;
1296
1297         case UVCIOC_CTRL_QUERY32:
1298                 cmd = UVCIOC_CTRL_QUERY;
1299                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1300                 break;
1301
1302         default:
1303                 return -ENOIOCTLCMD;
1304         }
1305
1306         old_fs = get_fs();
1307         set_fs(KERNEL_DS);
1308         ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
1309         set_fs(old_fs);
1310
1311         if (ret < 0)
1312                 return ret;
1313
1314         switch (cmd) {
1315         case UVCIOC_CTRL_MAP:
1316                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1317                 break;
1318
1319         case UVCIOC_CTRL_QUERY:
1320                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1321                 break;
1322         }
1323
1324         return ret;
1325 }
1326 #endif
1327
1328 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1329                     size_t count, loff_t *ppos)
1330 {
1331         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1332         return -EINVAL;
1333 }
1334
1335 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1336 {
1337         struct uvc_fh *handle = file->private_data;
1338         struct uvc_streaming *stream = handle->stream;
1339
1340         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1341
1342         return uvc_queue_mmap(&stream->queue, vma);
1343 }
1344
1345 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1346 {
1347         struct uvc_fh *handle = file->private_data;
1348         struct uvc_streaming *stream = handle->stream;
1349
1350         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1351
1352         return uvc_queue_poll(&stream->queue, file, wait);
1353 }
1354
1355 #ifndef CONFIG_MMU
1356 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1357                 unsigned long addr, unsigned long len, unsigned long pgoff,
1358                 unsigned long flags)
1359 {
1360         struct uvc_fh *handle = file->private_data;
1361         struct uvc_streaming *stream = handle->stream;
1362
1363         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1364
1365         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1366 }
1367 #endif
1368
1369 const struct v4l2_file_operations uvc_fops = {
1370         .owner          = THIS_MODULE,
1371         .open           = uvc_v4l2_open,
1372         .release        = uvc_v4l2_release,
1373         .unlocked_ioctl = uvc_v4l2_ioctl,
1374 #ifdef CONFIG_COMPAT
1375         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1376 #endif
1377         .read           = uvc_v4l2_read,
1378         .mmap           = uvc_v4l2_mmap,
1379         .poll           = uvc_v4l2_poll,
1380 #ifndef CONFIG_MMU
1381         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1382 #endif
1383 };
1384