drivers/media/usb/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/compat.h>
  15 #include <linux/kernel.h>
  16 #include <linux/version.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/videodev2.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/mm.h>
  24 #include <linux/wait.h>
  25 #include <linux/atomic.h>
  26
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include <media/v4l2-event.h>
  30 #include <media/v4l2-ioctl.h>
  31
  32 #include "uvcvideo.h"
  33
  34 /* ------------------------------------------------------------------------
  35  * UVC ioctls
  36  */
  37 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
  38         struct uvc_xu_control_mapping *xmap)
  39 {
  40         struct uvc_control_mapping *map;
  41         unsigned int size;
  42         int ret;
  43
  44         map = kzalloc(sizeof *map, GFP_KERNEL);
  45         if (map == NULL)
  46                 return -ENOMEM;
  47
  48         map->id = xmap->id;
  49         memcpy(map->name, xmap->name, sizeof map->name);
  50         memcpy(map->entity, xmap->entity, sizeof map->entity);
  51         map->selector = xmap->selector;
  52         map->size = xmap->size;
  53         map->offset = xmap->offset;
  54         map->v4l2_type = xmap->v4l2_type;
  55         map->data_type = xmap->data_type;
  56
  57         switch (xmap->v4l2_type) {
  58         case V4L2_CTRL_TYPE_INTEGER:
  59         case V4L2_CTRL_TYPE_BOOLEAN:
  60         case V4L2_CTRL_TYPE_BUTTON:
  61                 break;
  62
  63         case V4L2_CTRL_TYPE_MENU:
  64                 /* Prevent excessive memory consumption, as well as integer
  65                  * overflows.
  66                  */
  67                 if (xmap->menu_count == 0 ||
  68                     xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
  69                         ret = -EINVAL;
  70                         goto done;
  71                 }
  72
  73                 size = xmap->menu_count * sizeof(*map->menu_info);
  74                 map->menu_info = kmalloc(size, GFP_KERNEL);
  75                 if (map->menu_info == NULL) {
  76                         ret = -ENOMEM;
  77                         goto done;
  78                 }
  79
  80                 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
  81                         ret = -EFAULT;
  82                         goto done;
  83                 }
  84
  85                 map->menu_count = xmap->menu_count;
  86                 break;
  87
  88         default:
  89                 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
  90                           "%u.\n", xmap->v4l2_type);
  91                 ret = -ENOTTY;
  92                 goto done;
  93         }
  94
  95         ret = uvc_ctrl_add_mapping(chain, map);
  96
  97 done:
  98         kfree(map->menu_info);
  99         kfree(map);
 100
 101         return ret;
 102 }
 103
 104 /* ------------------------------------------------------------------------
 105  * V4L2 interface
 106  */
 107
 108 /*
 109  * Find the frame interval closest to the requested frame interval for the
 110  * given frame format and size. This should be done by the device as part of
 111  * the Video Probe and Commit negotiation, but some hardware don't implement
 112  * that feature.
 113  */
 114 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
 115 {
 116         unsigned int i;
 117
 118         if (frame->bFrameIntervalType) {
 119                 __u32 best = -1, dist;
 120
 121                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 122                         dist = interval > frame->dwFrameInterval[i]
 123                              ? interval - frame->dwFrameInterval[i]
 124                              : frame->dwFrameInterval[i] - interval;
 125
 126                         if (dist > best)
 127                                 break;
 128
 129                         best = dist;
 130                 }
 131
 132                 interval = frame->dwFrameInterval[i-1];
 133         } else {
 134                 const __u32 min = frame->dwFrameInterval[0];
 135                 const __u32 max = frame->dwFrameInterval[1];
 136                 const __u32 step = frame->dwFrameInterval[2];
 137
 138                 interval = min + (interval - min + step/2) / step * step;
 139                 if (interval > max)
 140                         interval = max;
 141         }
 142
 143         return interval;
 144 }
 145
 146 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 147         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 148         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 149 {
 150         struct uvc_format *format = NULL;
 151         struct uvc_frame *frame = NULL;
 152         __u16 rw, rh;
 153         unsigned int d, maxd;
 154         unsigned int i;
 155         __u32 interval;
 156         int ret = 0;
 157         __u8 *fcc;
 158
 159         if (fmt->type != stream->type)
 160                 return -EINVAL;
 161
 162         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 163         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 164                         fmt->fmt.pix.pixelformat,
 165                         fcc[0], fcc[1], fcc[2], fcc[3],
 166                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 167
 168         /* Check if the hardware supports the requested format, use the default
 169          * format otherwise.
 170          */
 171         for (i = 0; i < stream->nformats; ++i) {
 172                 format = &stream->format[i];
 173                 if (format->fcc == fmt->fmt.pix.pixelformat)
 174                         break;
 175         }
 176
 177         if (i == stream->nformats) {
 178                 format = stream->def_format;
 179                 fmt->fmt.pix.pixelformat = format->fcc;
 180         }
 181
 182         /* Find the closest image size. The distance between image sizes is
 183          * the size in pixels of the non-overlapping regions between the
 184          * requested size and the frame-specified size.
 185          */
 186         rw = fmt->fmt.pix.width;
 187         rh = fmt->fmt.pix.height;
 188         maxd = (unsigned int)-1;
 189
 190         for (i = 0; i < format->nframes; ++i) {
 191                 __u16 w = format->frame[i].wWidth;
 192                 __u16 h = format->frame[i].wHeight;
 193
 194                 d = min(w, rw) * min(h, rh);
 195                 d = w*h + rw*rh - 2*d;
 196                 if (d < maxd) {
 197                         maxd = d;
 198                         frame = &format->frame[i];
 199                 }
 200
 201                 if (maxd == 0)
 202                         break;
 203         }
 204
 205         if (frame == NULL) {
 206                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 207                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 208                 return -EINVAL;
 209         }
 210
 211         /* Use the default frame interval. */
 212         interval = frame->dwDefaultFrameInterval;
 213         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 214                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 215                 (100000000/interval)%10);
 216
 217         /* Set the format index, frame index and frame interval. */
 218         memset(probe, 0, sizeof *probe);
 219         probe->bmHint = 1;      /* dwFrameInterval */
 220         probe->bFormatIndex = format->index;
 221         probe->bFrameIndex = frame->bFrameIndex;
 222         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 223         /* Some webcams stall the probe control set request when the
 224          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 225          * clearly states that the field is read-only from the host, so this
 226          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 227          * the webcam to work around the problem.
 228          *
 229          * The workaround could probably be enabled for all webcams, so the
 230          * quirk can be removed if needed. It's currently useful to detect
 231          * webcam bugs and fix them before they hit the market (providing
 232          * developers test their webcams with the Linux driver as well as with
 233          * the Windows driver).
 234          */
 235         mutex_lock(&stream->mutex);
 236         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 237                 probe->dwMaxVideoFrameSize =
 238                         stream->ctrl.dwMaxVideoFrameSize;
 239
 240         /* Probe the device. */
 241         ret = uvc_probe_video(stream, probe);
 242         mutex_unlock(&stream->mutex);
 243         if (ret < 0)
 244                 goto done;
 245
 246         fmt->fmt.pix.width = frame->wWidth;
 247         fmt->fmt.pix.height = frame->wHeight;
 248         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 249         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 250         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 251         fmt->fmt.pix.colorspace = format->colorspace;
 252         fmt->fmt.pix.priv = 0;
 253
 254         if (uvc_format != NULL)
 255                 *uvc_format = format;
 256         if (uvc_frame != NULL)
 257                 *uvc_frame = frame;
 258
 259 done:
 260         return ret;
 261 }
 262
 263 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 264         struct v4l2_format *fmt)
 265 {
 266         struct uvc_format *format;
 267         struct uvc_frame *frame;
 268         int ret = 0;
 269
 270         if (fmt->type != stream->type)
 271                 return -EINVAL;
 272
 273         mutex_lock(&stream->mutex);
 274         format = stream->cur_format;
 275         frame = stream->cur_frame;
 276
 277         if (format == NULL || frame == NULL) {
 278                 ret = -EINVAL;
 279                 goto done;
 280         }
 281
 282         fmt->fmt.pix.pixelformat = format->fcc;
 283         fmt->fmt.pix.width = frame->wWidth;
 284         fmt->fmt.pix.height = frame->wHeight;
 285         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 286         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 287         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 288         fmt->fmt.pix.colorspace = format->colorspace;
 289         fmt->fmt.pix.priv = 0;
 290
 291 done:
 292         mutex_unlock(&stream->mutex);
 293         return ret;
 294 }
 295
 296 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 297         struct v4l2_format *fmt)
 298 {
 299         struct uvc_streaming_control probe;
 300         struct uvc_format *format;
 301         struct uvc_frame *frame;
 302         int ret;
 303
 304         if (fmt->type != stream->type)
 305                 return -EINVAL;
 306
 307         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 308         if (ret < 0)
 309                 return ret;
 310
 311         mutex_lock(&stream->mutex);
 312
 313         if (uvc_queue_allocated(&stream->queue)) {
 314                 ret = -EBUSY;
 315                 goto done;
 316         }
 317
 318         stream->ctrl = probe;
 319         stream->cur_format = format;
 320         stream->cur_frame = frame;
 321
 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_queue_release(&stream->queue);
 535
 536         /* Release the file handle. */
 537         uvc_dismiss_privileges(handle);
 538         v4l2_fh_del(&handle->vfh);
 539         v4l2_fh_exit(&handle->vfh);
 540         kfree(handle);
 541         file->private_data = NULL;
 542
 543         mutex_lock(&stream->dev->lock);
 544         if (--stream->dev->users == 0)
 545                 uvc_status_stop(stream->dev);
 546         mutex_unlock(&stream->dev->lock);
 547
 548         usb_autopm_put_interface(stream->dev->intf);
 549         return 0;
 550 }
 551
 552 static int uvc_ioctl_querycap(struct file *file, void *fh,
 553                               struct v4l2_capability *cap)
 554 {
 555         struct video_device *vdev = video_devdata(file);
 556         struct uvc_fh *handle = file->private_data;
 557         struct uvc_video_chain *chain = handle->chain;
 558         struct uvc_streaming *stream = handle->stream;
 559
 560         strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 561         strlcpy(cap->card, vdev->name, sizeof(cap->card));
 562         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 563         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 564                           | chain->caps;
 565         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 566                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 567         else
 568                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 569
 570         return 0;
 571 }
 572
 573 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 574                               struct v4l2_fmtdesc *fmt)
 575 {
 576         struct uvc_format *format;
 577         enum v4l2_buf_type type = fmt->type;
 578         __u32 index = fmt->index;
 579
 580         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 581                 return -EINVAL;
 582
 583         memset(fmt, 0, sizeof(*fmt));
 584         fmt->index = index;
 585         fmt->type = type;
 586
 587         format = &stream->format[fmt->index];
 588         fmt->flags = 0;
 589         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 590                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 591         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 592         fmt->description[sizeof(fmt->description) - 1] = 0;
 593         fmt->pixelformat = format->fcc;
 594         return 0;
 595 }
 596
 597 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 598                                       struct v4l2_fmtdesc *fmt)
 599 {
 600         struct uvc_fh *handle = fh;
 601         struct uvc_streaming *stream = handle->stream;
 602
 603         return uvc_ioctl_enum_fmt(stream, fmt);
 604 }
 605
 606 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 607                                       struct v4l2_fmtdesc *fmt)
 608 {
 609         struct uvc_fh *handle = fh;
 610         struct uvc_streaming *stream = handle->stream;
 611
 612         return uvc_ioctl_enum_fmt(stream, fmt);
 613 }
 614
 615 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 616                                    struct v4l2_format *fmt)
 617 {
 618         struct uvc_fh *handle = fh;
 619         struct uvc_streaming *stream = handle->stream;
 620
 621         return uvc_v4l2_get_format(stream, fmt);
 622 }
 623
 624 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 625                                    struct v4l2_format *fmt)
 626 {
 627         struct uvc_fh *handle = fh;
 628         struct uvc_streaming *stream = handle->stream;
 629
 630         return uvc_v4l2_get_format(stream, fmt);
 631 }
 632
 633 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 634                                    struct v4l2_format *fmt)
 635 {
 636         struct uvc_fh *handle = fh;
 637         struct uvc_streaming *stream = handle->stream;
 638         int ret;
 639
 640         ret = uvc_acquire_privileges(handle);
 641         if (ret < 0)
 642                 return ret;
 643
 644         return uvc_v4l2_set_format(stream, fmt);
 645 }
 646
 647 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 648                                    struct v4l2_format *fmt)
 649 {
 650         struct uvc_fh *handle = fh;
 651         struct uvc_streaming *stream = handle->stream;
 652         int ret;
 653
 654         ret = uvc_acquire_privileges(handle);
 655         if (ret < 0)
 656                 return ret;
 657
 658         return uvc_v4l2_set_format(stream, fmt);
 659 }
 660
 661 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 662                                      struct v4l2_format *fmt)
 663 {
 664         struct uvc_fh *handle = fh;
 665         struct uvc_streaming *stream = handle->stream;
 666         struct uvc_streaming_control probe;
 667
 668         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 669 }
 670
 671 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 672                                      struct v4l2_format *fmt)
 673 {
 674         struct uvc_fh *handle = fh;
 675         struct uvc_streaming *stream = handle->stream;
 676         struct uvc_streaming_control probe;
 677
 678         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 679 }
 680
 681 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 682                              struct v4l2_requestbuffers *rb)
 683 {
 684         struct uvc_fh *handle = fh;
 685         struct uvc_streaming *stream = handle->stream;
 686         int ret;
 687
 688         ret = uvc_acquire_privileges(handle);
 689         if (ret < 0)
 690                 return ret;
 691
 692         mutex_lock(&stream->mutex);
 693         ret = uvc_request_buffers(&stream->queue, rb);
 694         mutex_unlock(&stream->mutex);
 695         if (ret < 0)
 696                 return ret;
 697
 698         if (ret == 0)
 699                 uvc_dismiss_privileges(handle);
 700
 701         return 0;
 702 }
 703
 704 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 705                               struct v4l2_buffer *buf)
 706 {
 707         struct uvc_fh *handle = fh;
 708         struct uvc_streaming *stream = handle->stream;
 709
 710         if (!uvc_has_privileges(handle))
 711                 return -EBUSY;
 712
 713         return uvc_query_buffer(&stream->queue, buf);
 714 }
 715
 716 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 717 {
 718         struct uvc_fh *handle = fh;
 719         struct uvc_streaming *stream = handle->stream;
 720
 721         if (!uvc_has_privileges(handle))
 722                 return -EBUSY;
 723
 724         return uvc_queue_buffer(&stream->queue, buf);
 725 }
 726
 727 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 728 {
 729         struct uvc_fh *handle = fh;
 730         struct uvc_streaming *stream = handle->stream;
 731
 732         if (!uvc_has_privileges(handle))
 733                 return -EBUSY;
 734
 735         return uvc_dequeue_buffer(&stream->queue, buf,
 736                                   file->f_flags & O_NONBLOCK);
 737 }
 738
 739 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 740                                   struct v4l2_create_buffers *cb)
 741 {
 742         struct uvc_fh *handle = fh;
 743         struct uvc_streaming *stream = handle->stream;
 744         int ret;
 745
 746         ret = uvc_acquire_privileges(handle);
 747         if (ret < 0)
 748                 return ret;
 749
 750         return uvc_create_buffers(&stream->queue, cb);
 751 }
 752
 753 static int uvc_ioctl_streamon(struct file *file, void *fh,
 754                               enum v4l2_buf_type type)
 755 {
 756         struct uvc_fh *handle = fh;
 757         struct uvc_streaming *stream = handle->stream;
 758         int ret;
 759
 760         if (!uvc_has_privileges(handle))
 761                 return -EBUSY;
 762
 763         mutex_lock(&stream->mutex);
 764         ret = uvc_queue_streamon(&stream->queue, type);
 765         mutex_unlock(&stream->mutex);
 766
 767         return ret;
 768 }
 769
 770 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 771                                enum v4l2_buf_type type)
 772 {
 773         struct uvc_fh *handle = fh;
 774         struct uvc_streaming *stream = handle->stream;
 775
 776         if (!uvc_has_privileges(handle))
 777                 return -EBUSY;
 778
 779         mutex_lock(&stream->mutex);
 780         uvc_queue_streamoff(&stream->queue, type);
 781         mutex_unlock(&stream->mutex);
 782
 783         return 0;
 784 }
 785
 786 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 787                                 struct v4l2_input *input)
 788 {
 789         struct uvc_fh *handle = fh;
 790         struct uvc_video_chain *chain = handle->chain;
 791         const struct uvc_entity *selector = chain->selector;
 792         struct uvc_entity *iterm = NULL;
 793         u32 index = input->index;
 794         int pin = 0;
 795
 796         if (selector == NULL ||
 797             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 798                 if (index != 0)
 799                         return -EINVAL;
 800                 list_for_each_entry(iterm, &chain->entities, chain) {
 801                         if (UVC_ENTITY_IS_ITERM(iterm))
 802                                 break;
 803                 }
 804                 pin = iterm->id;
 805         } else if (index < selector->bNrInPins) {
 806                 pin = selector->baSourceID[index];
 807                 list_for_each_entry(iterm, &chain->entities, chain) {
 808                         if (!UVC_ENTITY_IS_ITERM(iterm))
 809                                 continue;
 810                         if (iterm->id == pin)
 811                                 break;
 812                 }
 813         }
 814
 815         if (iterm == NULL || iterm->id != pin)
 816                 return -EINVAL;
 817
 818         memset(input, 0, sizeof(*input));
 819         input->index = index;
 820         strlcpy(input->name, iterm->name, sizeof(input->name));
 821         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 822                 input->type = V4L2_INPUT_TYPE_CAMERA;
 823
 824         return 0;
 825 }
 826
 827 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 828 {
 829         struct uvc_fh *handle = fh;
 830         struct uvc_video_chain *chain = handle->chain;
 831         int ret;
 832         u8 i;
 833
 834         if (chain->selector == NULL ||
 835             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 836                 *input = 0;
 837                 return 0;
 838         }
 839
 840         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 841                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 842                              &i, 1);
 843         if (ret < 0)
 844                 return ret;
 845
 846         *input = i - 1;
 847         return 0;
 848 }
 849
 850 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 851 {
 852         struct uvc_fh *handle = fh;
 853         struct uvc_video_chain *chain = handle->chain;
 854         int ret;
 855         u32 i;
 856
 857         ret = uvc_acquire_privileges(handle);
 858         if (ret < 0)
 859                 return ret;
 860
 861         if (chain->selector == NULL ||
 862             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 863                 if (input)
 864                         return -EINVAL;
 865                 return 0;
 866         }
 867
 868         if (input >= chain->selector->bNrInPins)
 869                 return -EINVAL;
 870
 871         i = input + 1;
 872         return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 873                               chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 874                               &i, 1);
 875 }
 876
 877 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 878                                struct v4l2_queryctrl *qc)
 879 {
 880         struct uvc_fh *handle = fh;
 881         struct uvc_video_chain *chain = handle->chain;
 882
 883         return uvc_query_v4l2_ctrl(chain, qc);
 884 }
 885
 886 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 887                             struct v4l2_control *ctrl)
 888 {
 889         struct uvc_fh *handle = fh;
 890         struct uvc_video_chain *chain = handle->chain;
 891         struct v4l2_ext_control xctrl;
 892         int ret;
 893
 894         memset(&xctrl, 0, sizeof(xctrl));
 895         xctrl.id = ctrl->id;
 896
 897         ret = uvc_ctrl_begin(chain);
 898         if (ret < 0)
 899                 return ret;
 900
 901         ret = uvc_ctrl_get(chain, &xctrl);
 902         uvc_ctrl_rollback(handle);
 903         if (ret < 0)
 904                 return ret;
 905
 906         ctrl->value = xctrl.value;
 907         return 0;
 908 }
 909
 910 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 911                             struct v4l2_control *ctrl)
 912 {
 913         struct uvc_fh *handle = fh;
 914         struct uvc_video_chain *chain = handle->chain;
 915         struct v4l2_ext_control xctrl;
 916         int ret;
 917
 918         memset(&xctrl, 0, sizeof(xctrl));
 919         xctrl.id = ctrl->id;
 920         xctrl.value = ctrl->value;
 921
 922         ret = uvc_ctrl_begin(chain);
 923         if (ret < 0)
 924                 return ret;
 925
 926         ret = uvc_ctrl_set(chain, &xctrl);
 927         if (ret < 0) {
 928                 uvc_ctrl_rollback(handle);
 929                 return ret;
 930         }
 931
 932         ret = uvc_ctrl_commit(handle, &xctrl, 1);
 933         if (ret < 0)
 934                 return ret;
 935
 936         ctrl->value = xctrl.value;
 937         return 0;
 938 }
 939
 940 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 941                                  struct v4l2_ext_controls *ctrls)
 942 {
 943         struct uvc_fh *handle = fh;
 944         struct uvc_video_chain *chain = handle->chain;
 945         struct v4l2_ext_control *ctrl = ctrls->controls;
 946         unsigned int i;
 947         int ret;
 948
 949         ret = uvc_ctrl_begin(chain);
 950         if (ret < 0)
 951                 return ret;
 952
 953         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 954                 ret = uvc_ctrl_get(chain, ctrl);
 955                 if (ret < 0) {
 956                         uvc_ctrl_rollback(handle);
 957                         ctrls->error_idx = i;
 958                         return ret;
 959                 }
 960         }
 961
 962         ctrls->error_idx = 0;
 963
 964         return uvc_ctrl_rollback(handle);
 965 }
 966
 967 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
 968                                      struct v4l2_ext_controls *ctrls,
 969                                      bool commit)
 970 {
 971         struct v4l2_ext_control *ctrl = ctrls->controls;
 972         struct uvc_video_chain *chain = handle->chain;
 973         unsigned int i;
 974         int ret;
 975
 976         ret = uvc_ctrl_begin(chain);
 977         if (ret < 0)
 978                 return ret;
 979
 980         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 981                 ret = uvc_ctrl_set(chain, ctrl);
 982                 if (ret < 0) {
 983                         uvc_ctrl_rollback(handle);
 984                         ctrls->error_idx = commit ? ctrls->count : i;
 985                         return ret;
 986                 }
 987         }
 988
 989         ctrls->error_idx = 0;
 990
 991         if (commit)
 992                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
 993         else
 994                 return uvc_ctrl_rollback(handle);
 995 }
 996
 997 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
 998                                  struct v4l2_ext_controls *ctrls)
 999 {
1000         struct uvc_fh *handle = fh;
1001
1002         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1003 }
1004
1005 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1006                                    struct v4l2_ext_controls *ctrls)
1007 {
1008         struct uvc_fh *handle = fh;
1009
1010         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1011 }
1012
1013 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1014                                struct v4l2_querymenu *qm)
1015 {
1016         struct uvc_fh *handle = fh;
1017         struct uvc_video_chain *chain = handle->chain;
1018
1019         return uvc_query_v4l2_menu(chain, qm);
1020 }
1021
1022 static int uvc_ioctl_cropcap(struct file *file, void *fh,
1023                              struct v4l2_cropcap *ccap)
1024 {
1025         struct uvc_fh *handle = fh;
1026         struct uvc_streaming *stream = handle->stream;
1027
1028         if (ccap->type != stream->type)
1029                 return -EINVAL;
1030
1031         ccap->bounds.left = 0;
1032         ccap->bounds.top = 0;
1033         mutex_lock(&stream->mutex);
1034         ccap->bounds.width = stream->cur_frame->wWidth;
1035         ccap->bounds.height = stream->cur_frame->wHeight;
1036         mutex_unlock(&stream->mutex);
1037
1038         ccap->defrect = ccap->bounds;
1039
1040         ccap->pixelaspect.numerator = 1;
1041         ccap->pixelaspect.denominator = 1;
1042         return 0;
1043 }
1044
1045 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1046                             struct v4l2_streamparm *parm)
1047 {
1048         struct uvc_fh *handle = fh;
1049         struct uvc_streaming *stream = handle->stream;
1050
1051         return uvc_v4l2_get_streamparm(stream, parm);
1052 }
1053
1054 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1055                             struct v4l2_streamparm *parm)
1056 {
1057         struct uvc_fh *handle = fh;
1058         struct uvc_streaming *stream = handle->stream;
1059         int ret;
1060
1061         ret = uvc_acquire_privileges(handle);
1062         if (ret < 0)
1063                 return ret;
1064
1065         return uvc_v4l2_set_streamparm(stream, parm);
1066 }
1067
1068 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1069                                      struct v4l2_frmsizeenum *fsize)
1070 {
1071         struct uvc_fh *handle = fh;
1072         struct uvc_streaming *stream = handle->stream;
1073         struct uvc_format *format = NULL;
1074         struct uvc_frame *frame;
1075         int i;
1076
1077         /* Look for the given pixel format */
1078         for (i = 0; i < stream->nformats; i++) {
1079                 if (stream->format[i].fcc == fsize->pixel_format) {
1080                         format = &stream->format[i];
1081                         break;
1082                 }
1083         }
1084         if (format == NULL)
1085                 return -EINVAL;
1086
1087         if (fsize->index >= format->nframes)
1088                 return -EINVAL;
1089
1090         frame = &format->frame[fsize->index];
1091         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1092         fsize->discrete.width = frame->wWidth;
1093         fsize->discrete.height = frame->wHeight;
1094         return 0;
1095 }
1096
1097 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1098                                          struct v4l2_frmivalenum *fival)
1099 {
1100         struct uvc_fh *handle = fh;
1101         struct uvc_streaming *stream = handle->stream;
1102         struct uvc_format *format = NULL;
1103         struct uvc_frame *frame = NULL;
1104         int i;
1105
1106         /* Look for the given pixel format and frame size */
1107         for (i = 0; i < stream->nformats; i++) {
1108                 if (stream->format[i].fcc == fival->pixel_format) {
1109                         format = &stream->format[i];
1110                         break;
1111                 }
1112         }
1113         if (format == NULL)
1114                 return -EINVAL;
1115
1116         for (i = 0; i < format->nframes; i++) {
1117                 if (format->frame[i].wWidth == fival->width &&
1118                     format->frame[i].wHeight == fival->height) {
1119                         frame = &format->frame[i];
1120                         break;
1121                 }
1122         }
1123         if (frame == NULL)
1124                 return -EINVAL;
1125
1126         if (frame->bFrameIntervalType) {
1127                 if (fival->index >= frame->bFrameIntervalType)
1128                         return -EINVAL;
1129
1130                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1131                 fival->discrete.numerator =
1132                         frame->dwFrameInterval[fival->index];
1133                 fival->discrete.denominator = 10000000;
1134                 uvc_simplify_fraction(&fival->discrete.numerator,
1135                         &fival->discrete.denominator, 8, 333);
1136         } else {
1137                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1138                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1139                 fival->stepwise.min.denominator = 10000000;
1140                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1141                 fival->stepwise.max.denominator = 10000000;
1142                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1143                 fival->stepwise.step.denominator = 10000000;
1144                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1145                         &fival->stepwise.min.denominator, 8, 333);
1146                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1147                         &fival->stepwise.max.denominator, 8, 333);
1148                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1149                         &fival->stepwise.step.denominator, 8, 333);
1150         }
1151
1152         return 0;
1153 }
1154
1155 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1156                                      const struct v4l2_event_subscription *sub)
1157 {
1158         switch (sub->type) {
1159         case V4L2_EVENT_CTRL:
1160                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1161         default:
1162                 return -EINVAL;
1163         }
1164 }
1165
1166 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1167                               unsigned int cmd, void *arg)
1168 {
1169         struct uvc_fh *handle = fh;
1170         struct uvc_video_chain *chain = handle->chain;
1171
1172         switch (cmd) {
1173         /* Dynamic controls. */
1174         case UVCIOC_CTRL_MAP:
1175                 return uvc_ioctl_ctrl_map(chain, arg);
1176
1177         case UVCIOC_CTRL_QUERY:
1178                 return uvc_xu_ctrl_query(chain, arg);
1179
1180         default:
1181                 return -ENOTTY;
1182         }
1183 }
1184
1185 #ifdef CONFIG_COMPAT
1186 struct uvc_xu_control_mapping32 {
1187         __u32 id;
1188         __u8 name[32];
1189         __u8 entity[16];
1190         __u8 selector;
1191
1192         __u8 size;
1193         __u8 offset;
1194         __u32 v4l2_type;
1195         __u32 data_type;
1196
1197         compat_caddr_t menu_info;
1198         __u32 menu_count;
1199
1200         __u32 reserved[4];
1201 };
1202
1203 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1204                         const struct uvc_xu_control_mapping32 __user *up)
1205 {
1206         struct uvc_menu_info __user *umenus;
1207         struct uvc_menu_info __user *kmenus;
1208         compat_caddr_t p;
1209
1210         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1211             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1212             __get_user(kp->menu_count, &up->menu_count))
1213                 return -EFAULT;
1214
1215         memset(kp->reserved, 0, sizeof(kp->reserved));
1216
1217         if (kp->menu_count == 0) {
1218                 kp->menu_info = NULL;
1219                 return 0;
1220         }
1221
1222         if (__get_user(p, &up->menu_info))
1223                 return -EFAULT;
1224         umenus = compat_ptr(p);
1225         if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1226                 return -EFAULT;
1227
1228         kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1229         if (kmenus == NULL)
1230                 return -EFAULT;
1231         kp->menu_info = kmenus;
1232
1233         if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1234                 return -EFAULT;
1235
1236         return 0;
1237 }
1238
1239 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1240                         struct uvc_xu_control_mapping32 __user *up)
1241 {
1242         struct uvc_menu_info __user *umenus;
1243         struct uvc_menu_info __user *kmenus = kp->menu_info;
1244         compat_caddr_t p;
1245
1246         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1247             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1248             __put_user(kp->menu_count, &up->menu_count))
1249                 return -EFAULT;
1250
1251         if (__clear_user(up->reserved, sizeof(up->reserved)))
1252                 return -EFAULT;
1253
1254         if (kp->menu_count == 0)
1255                 return 0;
1256
1257         if (get_user(p, &up->menu_info))
1258                 return -EFAULT;
1259         umenus = compat_ptr(p);
1260
1261         if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1262                 return -EFAULT;
1263
1264         return 0;
1265 }
1266
1267 struct uvc_xu_control_query32 {
1268         __u8 unit;
1269         __u8 selector;
1270         __u8 query;
1271         __u16 size;
1272         compat_caddr_t data;
1273 };
1274
1275 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1276                         const struct uvc_xu_control_query32 __user *up)
1277 {
1278         u8 __user *udata;
1279         u8 __user *kdata;
1280         compat_caddr_t p;
1281
1282         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1283             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1284                 return -EFAULT;
1285
1286         if (kp->size == 0) {
1287                 kp->data = NULL;
1288                 return 0;
1289         }
1290
1291         if (__get_user(p, &up->data))
1292                 return -EFAULT;
1293         udata = compat_ptr(p);
1294         if (!access_ok(VERIFY_READ, udata, kp->size))
1295                 return -EFAULT;
1296
1297         kdata = compat_alloc_user_space(kp->size);
1298         if (kdata == NULL)
1299                 return -EFAULT;
1300         kp->data = kdata;
1301
1302         if (copy_in_user(kdata, udata, kp->size))
1303                 return -EFAULT;
1304
1305         return 0;
1306 }
1307
1308 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1309                         struct uvc_xu_control_query32 __user *up)
1310 {
1311         u8 __user *udata;
1312         u8 __user *kdata = kp->data;
1313         compat_caddr_t p;
1314
1315         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1316             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1317                 return -EFAULT;
1318
1319         if (kp->size == 0)
1320                 return 0;
1321
1322         if (get_user(p, &up->data))
1323                 return -EFAULT;
1324         udata = compat_ptr(p);
1325         if (!access_ok(VERIFY_READ, udata, kp->size))
1326                 return -EFAULT;
1327
1328         if (copy_in_user(udata, kdata, kp->size))
1329                 return -EFAULT;
1330
1331         return 0;
1332 }
1333
1334 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1335 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1336
1337 static long uvc_v4l2_compat_ioctl32(struct file *file,
1338                      unsigned int cmd, unsigned long arg)
1339 {
1340         union {
1341                 struct uvc_xu_control_mapping xmap;
1342                 struct uvc_xu_control_query xqry;
1343         } karg;
1344         void __user *up = compat_ptr(arg);
1345         mm_segment_t old_fs;
1346         long ret;
1347
1348         switch (cmd) {
1349         case UVCIOC_CTRL_MAP32:
1350                 cmd = UVCIOC_CTRL_MAP;
1351                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1352                 break;
1353
1354         case UVCIOC_CTRL_QUERY32:
1355                 cmd = UVCIOC_CTRL_QUERY;
1356                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1357                 break;
1358
1359         default:
1360                 return -ENOIOCTLCMD;
1361         }
1362
1363         old_fs = get_fs();
1364         set_fs(KERNEL_DS);
1365         ret = video_ioctl2(file, cmd, (unsigned long)&karg);
1366         set_fs(old_fs);
1367
1368         if (ret < 0)
1369                 return ret;
1370
1371         switch (cmd) {
1372         case UVCIOC_CTRL_MAP:
1373                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1374                 break;
1375
1376         case UVCIOC_CTRL_QUERY:
1377                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1378                 break;
1379         }
1380
1381         return ret;
1382 }
1383 #endif
1384
1385 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1386                     size_t count, loff_t *ppos)
1387 {
1388         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1389         return -EINVAL;
1390 }
1391
1392 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1393 {
1394         struct uvc_fh *handle = file->private_data;
1395         struct uvc_streaming *stream = handle->stream;
1396
1397         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1398
1399         return uvc_queue_mmap(&stream->queue, vma);
1400 }
1401
1402 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1403 {
1404         struct uvc_fh *handle = file->private_data;
1405         struct uvc_streaming *stream = handle->stream;
1406
1407         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1408
1409         return uvc_queue_poll(&stream->queue, file, wait);
1410 }
1411
1412 #ifndef CONFIG_MMU
1413 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1414                 unsigned long addr, unsigned long len, unsigned long pgoff,
1415                 unsigned long flags)
1416 {
1417         struct uvc_fh *handle = file->private_data;
1418         struct uvc_streaming *stream = handle->stream;
1419
1420         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1421
1422         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1423 }
1424 #endif
1425
1426 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1427         .vidioc_querycap = uvc_ioctl_querycap,
1428         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1429         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1430         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1431         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1432         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1433         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1434         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1435         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1436         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1437         .vidioc_querybuf = uvc_ioctl_querybuf,
1438         .vidioc_qbuf = uvc_ioctl_qbuf,
1439         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1440         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1441         .vidioc_streamon = uvc_ioctl_streamon,
1442         .vidioc_streamoff = uvc_ioctl_streamoff,
1443         .vidioc_enum_input = uvc_ioctl_enum_input,
1444         .vidioc_g_input = uvc_ioctl_g_input,
1445         .vidioc_s_input = uvc_ioctl_s_input,
1446         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1447         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1448         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1449         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1450         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1451         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1452         .vidioc_querymenu = uvc_ioctl_querymenu,
1453         .vidioc_cropcap = uvc_ioctl_cropcap,
1454         .vidioc_g_parm = uvc_ioctl_g_parm,
1455         .vidioc_s_parm = uvc_ioctl_s_parm,
1456         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1457         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1458         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1459         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1460         .vidioc_default = uvc_ioctl_default,
1461 };
1462
1463 const struct v4l2_file_operations uvc_fops = {
1464         .owner          = THIS_MODULE,
1465         .open           = uvc_v4l2_open,
1466         .release        = uvc_v4l2_release,
1467         .unlocked_ioctl = video_ioctl2,
1468 #ifdef CONFIG_COMPAT
1469         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1470 #endif
1471         .read           = uvc_v4l2_read,
1472         .mmap           = uvc_v4l2_mmap,
1473         .poll           = uvc_v4l2_poll,
1474 #ifndef CONFIG_MMU
1475         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1476 #endif
1477 };
1478