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