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 ([email protected])
   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
 322 done:
 323         mutex_unlock(&stream->mutex);
 324         return ret;
 325 }
 326
 327 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 328                 struct v4l2_streamparm *parm)
 329 {
 330         uint32_t numerator, denominator;
 331
 332         if (parm->type != stream->type)
 333                 return -EINVAL;
 334
 335         mutex_lock(&stream->mutex);
 336         numerator = stream->ctrl.dwFrameInterval;
 337         mutex_unlock(&stream->mutex);
 338
 339         denominator = 10000000;
 340         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 341
 342         memset(parm, 0, sizeof *parm);
 343         parm->type = stream->type;
 344
 345         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 346                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 347                 parm->parm.capture.capturemode = 0;
 348                 parm->parm.capture.timeperframe.numerator = numerator;
 349                 parm->parm.capture.timeperframe.denominator = denominator;
 350                 parm->parm.capture.extendedmode = 0;
 351                 parm->parm.capture.readbuffers = 0;
 352         } else {
 353                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 354                 parm->parm.output.outputmode = 0;
 355                 parm->parm.output.timeperframe.numerator = numerator;
 356                 parm->parm.output.timeperframe.denominator = denominator;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 363                 struct v4l2_streamparm *parm)
 364 {
 365         struct uvc_streaming_control probe;
 366         struct v4l2_fract timeperframe;
 367         uint32_t interval;
 368         int ret;
 369
 370         if (parm->type != stream->type)
 371                 return -EINVAL;
 372
 373         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 374                 timeperframe = parm->parm.capture.timeperframe;
 375         else
 376                 timeperframe = parm->parm.output.timeperframe;
 377
 378         interval = uvc_fraction_to_interval(timeperframe.numerator,
 379                 timeperframe.denominator);
 380         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 381                 timeperframe.numerator, timeperframe.denominator, interval);
 382
 383         mutex_lock(&stream->mutex);
 384
 385         if (uvc_queue_streaming(&stream->queue)) {
 386                 mutex_unlock(&stream->mutex);
 387                 return -EBUSY;
 388         }
 389
 390         probe = stream->ctrl;
 391         probe.dwFrameInterval =
 392                 uvc_try_frame_interval(stream->cur_frame, interval);
 393
 394         /* Probe the device with the new settings. */
 395         ret = uvc_probe_video(stream, &probe);
 396         if (ret < 0) {
 397                 mutex_unlock(&stream->mutex);
 398                 return ret;
 399         }
 400
 401         stream->ctrl = probe;
 402         mutex_unlock(&stream->mutex);
 403
 404         /* Return the actual frame period. */
 405         timeperframe.numerator = probe.dwFrameInterval;
 406         timeperframe.denominator = 10000000;
 407         uvc_simplify_fraction(&timeperframe.numerator,
 408                 &timeperframe.denominator, 8, 333);
 409
 410         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 411                 parm->parm.capture.timeperframe = timeperframe;
 412         else
 413                 parm->parm.output.timeperframe = timeperframe;
 414
 415         return 0;
 416 }
 417
 418 /* ------------------------------------------------------------------------
 419  * Privilege management
 420  */
 421
 422 /*
 423  * Privilege management is the multiple-open implementation basis. The current
 424  * implementation is completely transparent for the end-user and doesn't
 425  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 426  * Those ioctls enable finer control on the device (by making possible for a
 427  * user to request exclusive access to a device), but are not mature yet.
 428  * Switching to the V4L2 priority mechanism might be considered in the future
 429  * if this situation changes.
 430  *
 431  * Each open instance of a UVC device can either be in a privileged or
 432  * unprivileged state. Only a single instance can be in a privileged state at
 433  * a given time. Trying to perform an operation that requires privileges will
 434  * automatically acquire the required privileges if possible, or return -EBUSY
 435  * otherwise. Privileges are dismissed when closing the instance or when
 436  * freeing the video buffers using VIDIOC_REQBUFS.
 437  *
 438  * Operations that require privileges are:
 439  *
 440  * - VIDIOC_S_INPUT
 441  * - VIDIOC_S_PARM
 442  * - VIDIOC_S_FMT
 443  * - VIDIOC_REQBUFS
 444  */
 445 static int uvc_acquire_privileges(struct uvc_fh *handle)
 446 {
 447         /* Always succeed if the handle is already privileged. */
 448         if (handle->state == UVC_HANDLE_ACTIVE)
 449                 return 0;
 450
 451         /* Check if the device already has a privileged handle. */
 452         if (atomic_inc_return(&handle->stream->active) != 1) {
 453                 atomic_dec(&handle->stream->active);
 454                 return -EBUSY;
 455         }
 456
 457         handle->state = UVC_HANDLE_ACTIVE;
 458         return 0;
 459 }
 460
 461 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 462 {
 463         if (handle->state == UVC_HANDLE_ACTIVE)
 464                 atomic_dec(&handle->stream->active);
 465
 466         handle->state = UVC_HANDLE_PASSIVE;
 467 }
 468
 469 static int uvc_has_privileges(struct uvc_fh *handle)
 470 {
 471         return handle->state == UVC_HANDLE_ACTIVE;
 472 }
 473
 474 /* ------------------------------------------------------------------------
 475  * V4L2 file operations
 476  */
 477
 478 static int uvc_v4l2_open(struct file *file)
 479 {
 480         struct uvc_streaming *stream;
 481         struct uvc_fh *handle;
 482         int ret = 0;
 483
 484         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 485         stream = video_drvdata(file);
 486
 487         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 488                 return -ENODEV;
 489
 490         ret = usb_autopm_get_interface(stream->dev->intf);
 491         if (ret < 0)
 492                 return ret;
 493
 494         /* Create the device handle. */
 495         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 496         if (handle == NULL) {
 497                 usb_autopm_put_interface(stream->dev->intf);
 498                 return -ENOMEM;
 499         }
 500
 501         mutex_lock(&stream->dev->lock);
 502         if (stream->dev->users == 0) {
 503                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 504                 if (ret < 0) {
 505                         mutex_unlock(&stream->dev->lock);
 506                         usb_autopm_put_interface(stream->dev->intf);
 507                         kfree(handle);
 508                         return ret;
 509                 }
 510         }
 511
 512         stream->dev->users++;
 513         mutex_unlock(&stream->dev->lock);
 514
 515         v4l2_fh_init(&handle->vfh, stream->vdev);
 516         v4l2_fh_add(&handle->vfh);
 517         handle->chain = stream->chain;
 518         handle->stream = stream;
 519         handle->state = UVC_HANDLE_PASSIVE;
 520         file->private_data = handle;
 521
 522         return 0;
 523 }
 524
 525 static int uvc_v4l2_release(struct file *file)
 526 {
 527         struct uvc_fh *handle = file->private_data;
 528         struct uvc_streaming *stream = handle->stream;
 529
 530         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 531
 532         /* Only free resources if this is a privileged handle. */
 533         if (uvc_has_privileges(handle)) {
 534                 uvc_video_enable(stream, 0);
 535                 uvc_free_buffers(&stream->queue);
 536         }
 537
 538         /* Release the file handle. */
 539         uvc_dismiss_privileges(handle);
 540         v4l2_fh_del(&handle->vfh);
 541         v4l2_fh_exit(&handle->vfh);
 542         kfree(handle);
 543         file->private_data = NULL;
 544
 545         mutex_lock(&stream->dev->lock);
 546         if (--stream->dev->users == 0)
 547                 uvc_status_stop(stream->dev);
 548         mutex_unlock(&stream->dev->lock);
 549
 550         usb_autopm_put_interface(stream->dev->intf);
 551         return 0;
 552 }
 553
 554 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 555 {
 556         struct video_device *vdev = video_devdata(file);
 557         struct uvc_fh *handle = file->private_data;
 558         struct uvc_video_chain *chain = handle->chain;
 559         struct uvc_streaming *stream = handle->stream;
 560         long ret = 0;
 561
 562         switch (cmd) {
 563         /* Query capabilities */
 564         case VIDIOC_QUERYCAP:
 565         {
 566                 struct v4l2_capability *cap = arg;
 567
 568                 memset(cap, 0, sizeof *cap);
 569                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 570                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 571                 usb_make_path(stream->dev->udev,
 572                               cap->bus_info, sizeof(cap->bus_info));
 573                 cap->version = LINUX_VERSION_CODE;
 574                 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 575                                   | chain->caps;
 576                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 577                         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
 578                                          | V4L2_CAP_STREAMING;
 579                 else
 580                         cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
 581                                          | V4L2_CAP_STREAMING;
 582                 break;
 583         }
 584
 585         /* Priority */
 586         case VIDIOC_G_PRIORITY:
 587                 *(u32 *)arg = v4l2_prio_max(vdev->prio);
 588                 break;
 589
 590         case VIDIOC_S_PRIORITY:
 591                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 592                 if (ret < 0)
 593                         return ret;
 594
 595                 return v4l2_prio_change(vdev->prio, &handle->vfh.prio,
 596                                         *(u32 *)arg);
 597
 598         /* Get, Set & Query control */
 599         case VIDIOC_QUERYCTRL:
 600                 return uvc_query_v4l2_ctrl(chain, arg);
 601
 602         case VIDIOC_G_CTRL:
 603         {
 604                 struct v4l2_control *ctrl = arg;
 605                 struct v4l2_ext_control xctrl;
 606
 607                 memset(&xctrl, 0, sizeof xctrl);
 608                 xctrl.id = ctrl->id;
 609
 610                 ret = uvc_ctrl_begin(chain);
 611                 if (ret < 0)
 612                         return ret;
 613
 614                 ret = uvc_ctrl_get(chain, &xctrl);
 615                 uvc_ctrl_rollback(handle);
 616                 if (ret >= 0)
 617                         ctrl->value = xctrl.value;
 618                 break;
 619         }
 620
 621         case VIDIOC_S_CTRL:
 622         {
 623                 struct v4l2_control *ctrl = arg;
 624                 struct v4l2_ext_control xctrl;
 625
 626                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 627                 if (ret < 0)
 628                         return ret;
 629
 630                 memset(&xctrl, 0, sizeof xctrl);
 631                 xctrl.id = ctrl->id;
 632                 xctrl.value = ctrl->value;
 633
 634                 ret = uvc_ctrl_begin(chain);
 635                 if (ret < 0)
 636                         return ret;
 637
 638                 ret = uvc_ctrl_set(chain, &xctrl);
 639                 if (ret < 0) {
 640                         uvc_ctrl_rollback(handle);
 641                         return ret;
 642                 }
 643                 ret = uvc_ctrl_commit(handle, &xctrl, 1);
 644                 if (ret == 0)
 645                         ctrl->value = xctrl.value;
 646                 break;
 647         }
 648
 649         case VIDIOC_QUERYMENU:
 650                 return uvc_query_v4l2_menu(chain, arg);
 651
 652         case VIDIOC_G_EXT_CTRLS:
 653         {
 654                 struct v4l2_ext_controls *ctrls = arg;
 655                 struct v4l2_ext_control *ctrl = ctrls->controls;
 656                 unsigned int i;
 657
 658                 ret = uvc_ctrl_begin(chain);
 659                 if (ret < 0)
 660                         return ret;
 661
 662                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 663                         ret = uvc_ctrl_get(chain, ctrl);
 664                         if (ret < 0) {
 665                                 uvc_ctrl_rollback(handle);
 666                                 ctrls->error_idx = i;
 667                                 return ret;
 668                         }
 669                 }
 670                 ctrls->error_idx = 0;
 671                 ret = uvc_ctrl_rollback(handle);
 672                 break;
 673         }
 674
 675         case VIDIOC_S_EXT_CTRLS:
 676                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 677                 if (ret < 0)
 678                         return ret;
 679                 /* Fall through */
 680         case VIDIOC_TRY_EXT_CTRLS:
 681         {
 682                 struct v4l2_ext_controls *ctrls = arg;
 683                 struct v4l2_ext_control *ctrl = ctrls->controls;
 684                 unsigned int i;
 685
 686                 ret = uvc_ctrl_begin(chain);
 687                 if (ret < 0)
 688                         return ret;
 689
 690                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 691                         ret = uvc_ctrl_set(chain, ctrl);
 692                         if (ret < 0) {
 693                                 uvc_ctrl_rollback(handle);
 694                                 ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
 695                                                  ? ctrls->count : i;
 696                                 return ret;
 697                         }
 698                 }
 699
 700                 ctrls->error_idx = 0;
 701
 702                 if (cmd == VIDIOC_S_EXT_CTRLS)
 703                         ret = uvc_ctrl_commit(handle,
 704                                               ctrls->controls, ctrls->count);
 705                 else
 706                         ret = uvc_ctrl_rollback(handle);
 707                 break;
 708         }
 709
 710         /* Get, Set & Enum input */
 711         case VIDIOC_ENUMINPUT:
 712         {
 713                 const struct uvc_entity *selector = chain->selector;
 714                 struct v4l2_input *input = arg;
 715                 struct uvc_entity *iterm = NULL;
 716                 u32 index = input->index;
 717                 int pin = 0;
 718
 719                 if (selector == NULL ||
 720                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 721                         if (index != 0)
 722                                 return -EINVAL;
 723                         list_for_each_entry(iterm, &chain->entities, chain) {
 724                                 if (UVC_ENTITY_IS_ITERM(iterm))
 725                                         break;
 726                         }
 727                         pin = iterm->id;
 728                 } else if (index < selector->bNrInPins) {
 729                         pin = selector->baSourceID[index];
 730                         list_for_each_entry(iterm, &chain->entities, chain) {
 731                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 732                                         continue;
 733                                 if (iterm->id == pin)
 734                                         break;
 735                         }
 736                 }
 737
 738                 if (iterm == NULL || iterm->id != pin)
 739                         return -EINVAL;
 740
 741                 memset(input, 0, sizeof *input);
 742                 input->index = index;
 743                 strlcpy(input->name, iterm->name, sizeof input->name);
 744                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 745                         input->type = V4L2_INPUT_TYPE_CAMERA;
 746                 break;
 747         }
 748
 749         case VIDIOC_G_INPUT:
 750         {
 751                 u8 input;
 752
 753                 if (chain->selector == NULL ||
 754                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 755                         *(int *)arg = 0;
 756                         break;
 757                 }
 758
 759                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 760                         chain->selector->id, chain->dev->intfnum,
 761                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 762                 if (ret < 0)
 763                         return ret;
 764
 765                 *(int *)arg = input - 1;
 766                 break;
 767         }
 768
 769         case VIDIOC_S_INPUT:
 770         {
 771                 u32 input = *(u32 *)arg + 1;
 772
 773                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 774                 if (ret < 0)
 775                         return ret;
 776
 777                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 778                         return ret;
 779
 780                 if (chain->selector == NULL ||
 781                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 782                         if (input != 1)
 783                                 return -EINVAL;
 784                         break;
 785                 }
 786
 787                 if (input == 0 || input > chain->selector->bNrInPins)
 788                         return -EINVAL;
 789
 790                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 791                         chain->selector->id, chain->dev->intfnum,
 792                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 793         }
 794
 795         /* Try, Get, Set & Enum format */
 796         case VIDIOC_ENUM_FMT:
 797         {
 798                 struct v4l2_fmtdesc *fmt = arg;
 799                 struct uvc_format *format;
 800                 enum v4l2_buf_type type = fmt->type;
 801                 __u32 index = fmt->index;
 802
 803                 if (fmt->type != stream->type ||
 804                     fmt->index >= stream->nformats)
 805                         return -EINVAL;
 806
 807                 memset(fmt, 0, sizeof(*fmt));
 808                 fmt->index = index;
 809                 fmt->type = type;
 810
 811                 format = &stream->format[fmt->index];
 812                 fmt->flags = 0;
 813                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 814                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 815                 strlcpy(fmt->description, format->name,
 816                         sizeof fmt->description);
 817                 fmt->description[sizeof fmt->description - 1] = 0;
 818                 fmt->pixelformat = format->fcc;
 819                 break;
 820         }
 821
 822         case VIDIOC_TRY_FMT:
 823         {
 824                 struct uvc_streaming_control probe;
 825
 826                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 827         }
 828
 829         case VIDIOC_S_FMT:
 830                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 831                 if (ret < 0)
 832                         return ret;
 833
 834                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 835                         return ret;
 836
 837                 return uvc_v4l2_set_format(stream, arg);
 838
 839         case VIDIOC_G_FMT:
 840                 return uvc_v4l2_get_format(stream, arg);
 841
 842         /* Frame size enumeration */
 843         case VIDIOC_ENUM_FRAMESIZES:
 844         {
 845                 struct v4l2_frmsizeenum *fsize = arg;
 846                 struct uvc_format *format = NULL;
 847                 struct uvc_frame *frame;
 848                 int i;
 849
 850                 /* Look for the given pixel format */
 851                 for (i = 0; i < stream->nformats; i++) {
 852                         if (stream->format[i].fcc ==
 853                                         fsize->pixel_format) {
 854                                 format = &stream->format[i];
 855                                 break;
 856                         }
 857                 }
 858                 if (format == NULL)
 859                         return -EINVAL;
 860
 861                 if (fsize->index >= format->nframes)
 862                         return -EINVAL;
 863
 864                 frame = &format->frame[fsize->index];
 865                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 866                 fsize->discrete.width = frame->wWidth;
 867                 fsize->discrete.height = frame->wHeight;
 868                 break;
 869         }
 870
 871         /* Frame interval enumeration */
 872         case VIDIOC_ENUM_FRAMEINTERVALS:
 873         {
 874                 struct v4l2_frmivalenum *fival = arg;
 875                 struct uvc_format *format = NULL;
 876                 struct uvc_frame *frame = NULL;
 877                 int i;
 878
 879                 /* Look for the given pixel format and frame size */
 880                 for (i = 0; i < stream->nformats; i++) {
 881                         if (stream->format[i].fcc ==
 882                                         fival->pixel_format) {
 883                                 format = &stream->format[i];
 884                                 break;
 885                         }
 886                 }
 887                 if (format == NULL)
 888                         return -EINVAL;
 889
 890                 for (i = 0; i < format->nframes; i++) {
 891                         if (format->frame[i].wWidth == fival->width &&
 892                             format->frame[i].wHeight == fival->height) {
 893                                 frame = &format->frame[i];
 894                                 break;
 895                         }
 896                 }
 897                 if (frame == NULL)
 898                         return -EINVAL;
 899
 900                 if (frame->bFrameIntervalType) {
 901                         if (fival->index >= frame->bFrameIntervalType)
 902                                 return -EINVAL;
 903
 904                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 905                         fival->discrete.numerator =
 906                                 frame->dwFrameInterval[fival->index];
 907                         fival->discrete.denominator = 10000000;
 908                         uvc_simplify_fraction(&fival->discrete.numerator,
 909                                 &fival->discrete.denominator, 8, 333);
 910                 } else {
 911                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 912                         fival->stepwise.min.numerator =
 913                                 frame->dwFrameInterval[0];
 914                         fival->stepwise.min.denominator = 10000000;
 915                         fival->stepwise.max.numerator =
 916                                 frame->dwFrameInterval[1];
 917                         fival->stepwise.max.denominator = 10000000;
 918                         fival->stepwise.step.numerator =
 919                                 frame->dwFrameInterval[2];
 920                         fival->stepwise.step.denominator = 10000000;
 921                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 922                                 &fival->stepwise.min.denominator, 8, 333);
 923                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 924                                 &fival->stepwise.max.denominator, 8, 333);
 925                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 926                                 &fival->stepwise.step.denominator, 8, 333);
 927                 }
 928                 break;
 929         }
 930
 931         /* Get & Set streaming parameters */
 932         case VIDIOC_G_PARM:
 933                 return uvc_v4l2_get_streamparm(stream, arg);
 934
 935         case VIDIOC_S_PARM:
 936                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 937                 if (ret < 0)
 938                         return ret;
 939
 940                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 941                         return ret;
 942
 943                 return uvc_v4l2_set_streamparm(stream, arg);
 944
 945         /* Cropping and scaling */
 946         case VIDIOC_CROPCAP:
 947         {
 948                 struct v4l2_cropcap *ccap = arg;
 949
 950                 if (ccap->type != stream->type)
 951                         return -EINVAL;
 952
 953                 ccap->bounds.left = 0;
 954                 ccap->bounds.top = 0;
 955
 956                 mutex_lock(&stream->mutex);
 957                 ccap->bounds.width = stream->cur_frame->wWidth;
 958                 ccap->bounds.height = stream->cur_frame->wHeight;
 959                 mutex_unlock(&stream->mutex);
 960
 961                 ccap->defrect = ccap->bounds;
 962
 963                 ccap->pixelaspect.numerator = 1;
 964                 ccap->pixelaspect.denominator = 1;
 965                 break;
 966         }
 967
 968         case VIDIOC_G_CROP:
 969         case VIDIOC_S_CROP:
 970                 return -ENOTTY;
 971
 972         /* Buffers & streaming */
 973         case VIDIOC_REQBUFS:
 974                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
 975                 if (ret < 0)
 976                         return ret;
 977
 978                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 979                         return ret;
 980
 981                 mutex_lock(&stream->mutex);
 982                 ret = uvc_alloc_buffers(&stream->queue, arg);
 983                 mutex_unlock(&stream->mutex);
 984                 if (ret < 0)
 985                         return ret;
 986
 987                 if (ret == 0)
 988                         uvc_dismiss_privileges(handle);
 989
 990                 ret = 0;
 991                 break;
 992
 993         case VIDIOC_QUERYBUF:
 994         {
 995                 struct v4l2_buffer *buf = arg;
 996
 997                 if (!uvc_has_privileges(handle))
 998                         return -EBUSY;
 999
1000                 return uvc_query_buffer(&stream->queue, buf);
1001         }
1002
1003         case VIDIOC_QBUF:
1004                 if (!uvc_has_privileges(handle))
1005                         return -EBUSY;
1006
1007                 return uvc_queue_buffer(&stream->queue, arg);
1008
1009         case VIDIOC_DQBUF:
1010                 if (!uvc_has_privileges(handle))
1011                         return -EBUSY;
1012
1013                 return uvc_dequeue_buffer(&stream->queue, arg,
1014                         file->f_flags & O_NONBLOCK);
1015
1016         case VIDIOC_STREAMON:
1017         {
1018                 int *type = arg;
1019
1020                 if (*type != stream->type)
1021                         return -EINVAL;
1022
1023                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1024                 if (ret < 0)
1025                         return ret;
1026
1027                 if (!uvc_has_privileges(handle))
1028                         return -EBUSY;
1029
1030                 mutex_lock(&stream->mutex);
1031                 ret = uvc_video_enable(stream, 1);
1032                 mutex_unlock(&stream->mutex);
1033                 if (ret < 0)
1034                         return ret;
1035                 break;
1036         }
1037
1038         case VIDIOC_STREAMOFF:
1039         {
1040                 int *type = arg;
1041
1042                 if (*type != stream->type)
1043                         return -EINVAL;
1044
1045                 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1046                 if (ret < 0)
1047                         return ret;
1048
1049                 if (!uvc_has_privileges(handle))
1050                         return -EBUSY;
1051
1052                 return uvc_video_enable(stream, 0);
1053         }
1054
1055         case VIDIOC_SUBSCRIBE_EVENT:
1056         {
1057                 struct v4l2_event_subscription *sub = arg;
1058
1059                 switch (sub->type) {
1060                 case V4L2_EVENT_CTRL:
1061                         return v4l2_event_subscribe(&handle->vfh, sub, 0,
1062                                                     &uvc_ctrl_sub_ev_ops);
1063                 default:
1064                         return -EINVAL;
1065                 }
1066         }
1067
1068         case VIDIOC_UNSUBSCRIBE_EVENT:
1069                 return v4l2_event_unsubscribe(&handle->vfh, arg);
1070
1071         case VIDIOC_DQEVENT:
1072                 return v4l2_event_dequeue(&handle->vfh, arg,
1073                                           file->f_flags & O_NONBLOCK);
1074
1075         /* Analog video standards make no sense for digital cameras. */
1076         case VIDIOC_ENUMSTD:
1077         case VIDIOC_QUERYSTD:
1078         case VIDIOC_G_STD:
1079         case VIDIOC_S_STD:
1080
1081         case VIDIOC_OVERLAY:
1082
1083         case VIDIOC_ENUMAUDIO:
1084         case VIDIOC_ENUMAUDOUT:
1085
1086         case VIDIOC_ENUMOUTPUT:
1087                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1088                 return -ENOTTY;
1089
1090         case UVCIOC_CTRL_MAP:
1091                 return uvc_ioctl_ctrl_map(chain, arg);
1092
1093         case UVCIOC_CTRL_QUERY:
1094                 return uvc_xu_ctrl_query(chain, arg);
1095
1096         default:
1097                 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1098                 return -ENOTTY;
1099         }
1100
1101         return ret;
1102 }
1103
1104 static long uvc_v4l2_ioctl(struct file *file,
1105                      unsigned int cmd, unsigned long arg)
1106 {
1107         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1108                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1109                 v4l_printk_ioctl(NULL, cmd);
1110                 printk(")\n");
1111         }
1112
1113         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1114 }
1115
1116 #ifdef CONFIG_COMPAT
1117 struct uvc_xu_control_mapping32 {
1118         __u32 id;
1119         __u8 name[32];
1120         __u8 entity[16];
1121         __u8 selector;
1122
1123         __u8 size;
1124         __u8 offset;
1125         __u32 v4l2_type;
1126         __u32 data_type;
1127
1128         compat_caddr_t menu_info;
1129         __u32 menu_count;
1130
1131         __u32 reserved[4];
1132 };
1133
1134 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1135                         const struct uvc_xu_control_mapping32 __user *up)
1136 {
1137         struct uvc_menu_info __user *umenus;
1138         struct uvc_menu_info __user *kmenus;
1139         compat_caddr_t p;
1140
1141         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1142             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1143             __get_user(kp->menu_count, &up->menu_count))
1144                 return -EFAULT;
1145
1146         memset(kp->reserved, 0, sizeof(kp->reserved));
1147
1148         if (kp->menu_count == 0) {
1149                 kp->menu_info = NULL;
1150                 return 0;
1151         }
1152
1153         if (__get_user(p, &up->menu_info))
1154                 return -EFAULT;
1155         umenus = compat_ptr(p);
1156         if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1157                 return -EFAULT;
1158
1159         kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1160         if (kmenus == NULL)
1161                 return -EFAULT;
1162         kp->menu_info = kmenus;
1163
1164         if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1165                 return -EFAULT;
1166
1167         return 0;
1168 }
1169
1170 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1171                         struct uvc_xu_control_mapping32 __user *up)
1172 {
1173         struct uvc_menu_info __user *umenus;
1174         struct uvc_menu_info __user *kmenus = kp->menu_info;
1175         compat_caddr_t p;
1176
1177         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1178             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1179             __put_user(kp->menu_count, &up->menu_count))
1180                 return -EFAULT;
1181
1182         if (__clear_user(up->reserved, sizeof(up->reserved)))
1183                 return -EFAULT;
1184
1185         if (kp->menu_count == 0)
1186                 return 0;
1187
1188         if (get_user(p, &up->menu_info))
1189                 return -EFAULT;
1190         umenus = compat_ptr(p);
1191
1192         if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1193                 return -EFAULT;
1194
1195         return 0;
1196 }
1197
1198 struct uvc_xu_control_query32 {
1199         __u8 unit;
1200         __u8 selector;
1201         __u8 query;
1202         __u16 size;
1203         compat_caddr_t data;
1204 };
1205
1206 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1207                         const struct uvc_xu_control_query32 __user *up)
1208 {
1209         u8 __user *udata;
1210         u8 __user *kdata;
1211         compat_caddr_t p;
1212
1213         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1214             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1215                 return -EFAULT;
1216
1217         if (kp->size == 0) {
1218                 kp->data = NULL;
1219                 return 0;
1220         }
1221
1222         if (__get_user(p, &up->data))
1223                 return -EFAULT;
1224         udata = compat_ptr(p);
1225         if (!access_ok(VERIFY_READ, udata, kp->size))
1226                 return -EFAULT;
1227
1228         kdata = compat_alloc_user_space(kp->size);
1229         if (kdata == NULL)
1230                 return -EFAULT;
1231         kp->data = kdata;
1232
1233         if (copy_in_user(kdata, udata, kp->size))
1234                 return -EFAULT;
1235
1236         return 0;
1237 }
1238
1239 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1240                         struct uvc_xu_control_query32 __user *up)
1241 {
1242         u8 __user *udata;
1243         u8 __user *kdata = kp->data;
1244         compat_caddr_t p;
1245
1246         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1247             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1248                 return -EFAULT;
1249
1250         if (kp->size == 0)
1251                 return 0;
1252
1253         if (get_user(p, &up->data))
1254                 return -EFAULT;
1255         udata = compat_ptr(p);
1256         if (!access_ok(VERIFY_READ, udata, kp->size))
1257                 return -EFAULT;
1258
1259         if (copy_in_user(udata, kdata, kp->size))
1260                 return -EFAULT;
1261
1262         return 0;
1263 }
1264
1265 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1266 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1267
1268 static long uvc_v4l2_compat_ioctl32(struct file *file,
1269                      unsigned int cmd, unsigned long arg)
1270 {
1271         union {
1272                 struct uvc_xu_control_mapping xmap;
1273                 struct uvc_xu_control_query xqry;
1274         } karg;
1275         void __user *up = compat_ptr(arg);
1276         mm_segment_t old_fs;
1277         long ret;
1278
1279         switch (cmd) {
1280         case UVCIOC_CTRL_MAP32:
1281                 cmd = UVCIOC_CTRL_MAP;
1282                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1283                 break;
1284
1285         case UVCIOC_CTRL_QUERY32:
1286                 cmd = UVCIOC_CTRL_QUERY;
1287                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1288                 break;
1289
1290         default:
1291                 return -ENOIOCTLCMD;
1292         }
1293
1294         old_fs = get_fs();
1295         set_fs(KERNEL_DS);
1296         ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
1297         set_fs(old_fs);
1298
1299         if (ret < 0)
1300                 return ret;
1301
1302         switch (cmd) {
1303         case UVCIOC_CTRL_MAP:
1304                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1305                 break;
1306
1307         case UVCIOC_CTRL_QUERY:
1308                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1309                 break;
1310         }
1311
1312         return ret;
1313 }
1314 #endif
1315
1316 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1317                     size_t count, loff_t *ppos)
1318 {
1319         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1320         return -EINVAL;
1321 }
1322
1323 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1324 {
1325         struct uvc_fh *handle = file->private_data;
1326         struct uvc_streaming *stream = handle->stream;
1327
1328         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1329
1330         return uvc_queue_mmap(&stream->queue, vma);
1331 }
1332
1333 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1334 {
1335         struct uvc_fh *handle = file->private_data;
1336         struct uvc_streaming *stream = handle->stream;
1337
1338         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1339
1340         return uvc_queue_poll(&stream->queue, file, wait);
1341 }
1342
1343 #ifndef CONFIG_MMU
1344 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1345                 unsigned long addr, unsigned long len, unsigned long pgoff,
1346                 unsigned long flags)
1347 {
1348         struct uvc_fh *handle = file->private_data;
1349         struct uvc_streaming *stream = handle->stream;
1350
1351         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1352
1353         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1354 }
1355 #endif
1356
1357 const struct v4l2_file_operations uvc_fops = {
1358         .owner          = THIS_MODULE,
1359         .open           = uvc_v4l2_open,
1360         .release        = uvc_v4l2_release,
1361         .unlocked_ioctl = uvc_v4l2_ioctl,
1362 #ifdef CONFIG_COMPAT
1363         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1364 #endif
1365         .read           = uvc_v4l2_read,
1366         .mmap           = uvc_v4l2_mmap,
1367         .poll           = uvc_v4l2_poll,
1368 #ifndef CONFIG_MMU
1369         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1370 #endif
1371 };
1372