drivers/media/usb/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart ([email protected])
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/compat.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/mm.h>
  23 #include <linux/wait.h>
  24 #include <linux/atomic.h>
  25
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-ctrls.h>
  28 #include <media/v4l2-event.h>
  29 #include <media/v4l2-ioctl.h>
  30
  31 #include "uvcvideo.h"
  32
  33 /* ------------------------------------------------------------------------
  34  * UVC ioctls
  35  */
  36 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
  37         struct uvc_xu_control_mapping *xmap)
  38 {
  39         struct uvc_control_mapping *map;
  40         unsigned int size;
  41         int ret;
  42
  43         map = kzalloc(sizeof *map, GFP_KERNEL);
  44         if (map == NULL)
  45                 return -ENOMEM;
  46
  47         map->id = xmap->id;
  48         memcpy(map->name, xmap->name, sizeof map->name);
  49         memcpy(map->entity, xmap->entity, sizeof map->entity);
  50         map->selector = xmap->selector;
  51         map->size = xmap->size;
  52         map->offset = xmap->offset;
  53         map->v4l2_type = xmap->v4l2_type;
  54         map->data_type = xmap->data_type;
  55
  56         switch (xmap->v4l2_type) {
  57         case V4L2_CTRL_TYPE_INTEGER:
  58         case V4L2_CTRL_TYPE_BOOLEAN:
  59         case V4L2_CTRL_TYPE_BUTTON:
  60                 break;
  61
  62         case V4L2_CTRL_TYPE_MENU:
  63                 /* Prevent excessive memory consumption, as well as integer
  64                  * overflows.
  65                  */
  66                 if (xmap->menu_count == 0 ||
  67                     xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
  68                         ret = -EINVAL;
  69                         goto free_map;
  70                 }
  71
  72                 size = xmap->menu_count * sizeof(*map->menu_info);
  73                 map->menu_info = memdup_user(xmap->menu_info, size);
  74                 if (IS_ERR(map->menu_info)) {
  75                         ret = PTR_ERR(map->menu_info);
  76                         goto free_map;
  77                 }
  78
  79                 map->menu_count = xmap->menu_count;
  80                 break;
  81
  82         default:
  83                 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
  84                           "%u.\n", xmap->v4l2_type);
  85                 ret = -ENOTTY;
  86                 goto free_map;
  87         }
  88
  89         ret = uvc_ctrl_add_mapping(chain, map);
  90
  91         kfree(map->menu_info);
  92 free_map:
  93         kfree(map);
  94
  95         return ret;
  96 }
  97
  98 /* ------------------------------------------------------------------------
  99  * V4L2 interface
 100  */
 101
 102 /*
 103  * Find the frame interval closest to the requested frame interval for the
 104  * given frame format and size. This should be done by the device as part of
 105  * the Video Probe and Commit negotiation, but some hardware don't implement
 106  * that feature.
 107  */
 108 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
 109 {
 110         unsigned int i;
 111
 112         if (frame->bFrameIntervalType) {
 113                 __u32 best = -1, dist;
 114
 115                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 116                         dist = interval > frame->dwFrameInterval[i]
 117                              ? interval - frame->dwFrameInterval[i]
 118                              : frame->dwFrameInterval[i] - interval;
 119
 120                         if (dist > best)
 121                                 break;
 122
 123                         best = dist;
 124                 }
 125
 126                 interval = frame->dwFrameInterval[i-1];
 127         } else {
 128                 const __u32 min = frame->dwFrameInterval[0];
 129                 const __u32 max = frame->dwFrameInterval[1];
 130                 const __u32 step = frame->dwFrameInterval[2];
 131
 132                 interval = min + (interval - min + step/2) / step * step;
 133                 if (interval > max)
 134                         interval = max;
 135         }
 136
 137         return interval;
 138 }
 139
 140 static __u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
 141         const struct uvc_frame *frame)
 142 {
 143         switch (format->fcc) {
 144         case V4L2_PIX_FMT_NV12:
 145         case V4L2_PIX_FMT_YVU420:
 146         case V4L2_PIX_FMT_YUV420:
 147         case V4L2_PIX_FMT_M420:
 148                 return frame->wWidth;
 149
 150         default:
 151                 return format->bpp * frame->wWidth / 8;
 152         }
 153 }
 154
 155 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 156         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 157         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 158 {
 159         struct uvc_format *format = NULL;
 160         struct uvc_frame *frame = NULL;
 161         __u16 rw, rh;
 162         unsigned int d, maxd;
 163         unsigned int i;
 164         __u32 interval;
 165         int ret = 0;
 166         __u8 *fcc;
 167
 168         if (fmt->type != stream->type)
 169                 return -EINVAL;
 170
 171         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 172         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 173                         fmt->fmt.pix.pixelformat,
 174                         fcc[0], fcc[1], fcc[2], fcc[3],
 175                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 176
 177         /* Check if the hardware supports the requested format, use the default
 178          * format otherwise.
 179          */
 180         for (i = 0; i < stream->nformats; ++i) {
 181                 format = &stream->format[i];
 182                 if (format->fcc == fmt->fmt.pix.pixelformat)
 183                         break;
 184         }
 185
 186         if (i == stream->nformats) {
 187                 format = stream->def_format;
 188                 fmt->fmt.pix.pixelformat = format->fcc;
 189         }
 190
 191         /* Find the closest image size. The distance between image sizes is
 192          * the size in pixels of the non-overlapping regions between the
 193          * requested size and the frame-specified size.
 194          */
 195         rw = fmt->fmt.pix.width;
 196         rh = fmt->fmt.pix.height;
 197         maxd = (unsigned int)-1;
 198
 199         for (i = 0; i < format->nframes; ++i) {
 200                 __u16 w = format->frame[i].wWidth;
 201                 __u16 h = format->frame[i].wHeight;
 202
 203                 d = min(w, rw) * min(h, rh);
 204                 d = w*h + rw*rh - 2*d;
 205                 if (d < maxd) {
 206                         maxd = d;
 207                         frame = &format->frame[i];
 208                 }
 209
 210                 if (maxd == 0)
 211                         break;
 212         }
 213
 214         if (frame == NULL) {
 215                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 216                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 217                 return -EINVAL;
 218         }
 219
 220         /* Use the default frame interval. */
 221         interval = frame->dwDefaultFrameInterval;
 222         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 223                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 224                 (100000000/interval)%10);
 225
 226         /* Set the format index, frame index and frame interval. */
 227         memset(probe, 0, sizeof *probe);
 228         probe->bmHint = 1;      /* dwFrameInterval */
 229         probe->bFormatIndex = format->index;
 230         probe->bFrameIndex = frame->bFrameIndex;
 231         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 232         /* Some webcams stall the probe control set request when the
 233          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 234          * clearly states that the field is read-only from the host, so this
 235          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 236          * the webcam to work around the problem.
 237          *
 238          * The workaround could probably be enabled for all webcams, so the
 239          * quirk can be removed if needed. It's currently useful to detect
 240          * webcam bugs and fix them before they hit the market (providing
 241          * developers test their webcams with the Linux driver as well as with
 242          * the Windows driver).
 243          */
 244         mutex_lock(&stream->mutex);
 245         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 246                 probe->dwMaxVideoFrameSize =
 247                         stream->ctrl.dwMaxVideoFrameSize;
 248
 249         /* Probe the device. */
 250         ret = uvc_probe_video(stream, probe);
 251         mutex_unlock(&stream->mutex);
 252         if (ret < 0)
 253                 goto done;
 254
 255         fmt->fmt.pix.width = frame->wWidth;
 256         fmt->fmt.pix.height = frame->wHeight;
 257         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 258         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 259         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 260         fmt->fmt.pix.colorspace = format->colorspace;
 261         fmt->fmt.pix.priv = 0;
 262
 263         if (uvc_format != NULL)
 264                 *uvc_format = format;
 265         if (uvc_frame != NULL)
 266                 *uvc_frame = frame;
 267
 268 done:
 269         return ret;
 270 }
 271
 272 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 273         struct v4l2_format *fmt)
 274 {
 275         struct uvc_format *format;
 276         struct uvc_frame *frame;
 277         int ret = 0;
 278
 279         if (fmt->type != stream->type)
 280                 return -EINVAL;
 281
 282         mutex_lock(&stream->mutex);
 283         format = stream->cur_format;
 284         frame = stream->cur_frame;
 285
 286         if (format == NULL || frame == NULL) {
 287                 ret = -EINVAL;
 288                 goto done;
 289         }
 290
 291         fmt->fmt.pix.pixelformat = format->fcc;
 292         fmt->fmt.pix.width = frame->wWidth;
 293         fmt->fmt.pix.height = frame->wHeight;
 294         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 295         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 296         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 297         fmt->fmt.pix.colorspace = format->colorspace;
 298         fmt->fmt.pix.priv = 0;
 299
 300 done:
 301         mutex_unlock(&stream->mutex);
 302         return ret;
 303 }
 304
 305 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 306         struct v4l2_format *fmt)
 307 {
 308         struct uvc_streaming_control probe;
 309         struct uvc_format *format;
 310         struct uvc_frame *frame;
 311         int ret;
 312
 313         if (fmt->type != stream->type)
 314                 return -EINVAL;
 315
 316         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 317         if (ret < 0)
 318                 return ret;
 319
 320         mutex_lock(&stream->mutex);
 321
 322         if (uvc_queue_allocated(&stream->queue)) {
 323                 ret = -EBUSY;
 324                 goto done;
 325         }
 326
 327         stream->ctrl = probe;
 328         stream->cur_format = format;
 329         stream->cur_frame = frame;
 330
 331 done:
 332         mutex_unlock(&stream->mutex);
 333         return ret;
 334 }
 335
 336 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 337                 struct v4l2_streamparm *parm)
 338 {
 339         uint32_t numerator, denominator;
 340
 341         if (parm->type != stream->type)
 342                 return -EINVAL;
 343
 344         mutex_lock(&stream->mutex);
 345         numerator = stream->ctrl.dwFrameInterval;
 346         mutex_unlock(&stream->mutex);
 347
 348         denominator = 10000000;
 349         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 350
 351         memset(parm, 0, sizeof *parm);
 352         parm->type = stream->type;
 353
 354         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 355                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 356                 parm->parm.capture.capturemode = 0;
 357                 parm->parm.capture.timeperframe.numerator = numerator;
 358                 parm->parm.capture.timeperframe.denominator = denominator;
 359                 parm->parm.capture.extendedmode = 0;
 360                 parm->parm.capture.readbuffers = 0;
 361         } else {
 362                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 363                 parm->parm.output.outputmode = 0;
 364                 parm->parm.output.timeperframe.numerator = numerator;
 365                 parm->parm.output.timeperframe.denominator = denominator;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 372                 struct v4l2_streamparm *parm)
 373 {
 374         struct uvc_streaming_control probe;
 375         struct v4l2_fract timeperframe;
 376         uint32_t interval;
 377         int ret;
 378
 379         if (parm->type != stream->type)
 380                 return -EINVAL;
 381
 382         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 383                 timeperframe = parm->parm.capture.timeperframe;
 384         else
 385                 timeperframe = parm->parm.output.timeperframe;
 386
 387         interval = uvc_fraction_to_interval(timeperframe.numerator,
 388                 timeperframe.denominator);
 389         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 390                 timeperframe.numerator, timeperframe.denominator, interval);
 391
 392         mutex_lock(&stream->mutex);
 393
 394         if (uvc_queue_streaming(&stream->queue)) {
 395                 mutex_unlock(&stream->mutex);
 396                 return -EBUSY;
 397         }
 398
 399         probe = stream->ctrl;
 400         probe.dwFrameInterval =
 401                 uvc_try_frame_interval(stream->cur_frame, interval);
 402
 403         /* Probe the device with the new settings. */
 404         ret = uvc_probe_video(stream, &probe);
 405         if (ret < 0) {
 406                 mutex_unlock(&stream->mutex);
 407                 return ret;
 408         }
 409
 410         stream->ctrl = probe;
 411         mutex_unlock(&stream->mutex);
 412
 413         /* Return the actual frame period. */
 414         timeperframe.numerator = probe.dwFrameInterval;
 415         timeperframe.denominator = 10000000;
 416         uvc_simplify_fraction(&timeperframe.numerator,
 417                 &timeperframe.denominator, 8, 333);
 418
 419         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 420                 parm->parm.capture.timeperframe = timeperframe;
 421         else
 422                 parm->parm.output.timeperframe = timeperframe;
 423
 424         return 0;
 425 }
 426
 427 /* ------------------------------------------------------------------------
 428  * Privilege management
 429  */
 430
 431 /*
 432  * Privilege management is the multiple-open implementation basis. The current
 433  * implementation is completely transparent for the end-user and doesn't
 434  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 435  * Those ioctls enable finer control on the device (by making possible for a
 436  * user to request exclusive access to a device), but are not mature yet.
 437  * Switching to the V4L2 priority mechanism might be considered in the future
 438  * if this situation changes.
 439  *
 440  * Each open instance of a UVC device can either be in a privileged or
 441  * unprivileged state. Only a single instance can be in a privileged state at
 442  * a given time. Trying to perform an operation that requires privileges will
 443  * automatically acquire the required privileges if possible, or return -EBUSY
 444  * otherwise. Privileges are dismissed when closing the instance or when
 445  * freeing the video buffers using VIDIOC_REQBUFS.
 446  *
 447  * Operations that require privileges are:
 448  *
 449  * - VIDIOC_S_INPUT
 450  * - VIDIOC_S_PARM
 451  * - VIDIOC_S_FMT
 452  * - VIDIOC_REQBUFS
 453  */
 454 static int uvc_acquire_privileges(struct uvc_fh *handle)
 455 {
 456         /* Always succeed if the handle is already privileged. */
 457         if (handle->state == UVC_HANDLE_ACTIVE)
 458                 return 0;
 459
 460         /* Check if the device already has a privileged handle. */
 461         if (atomic_inc_return(&handle->stream->active) != 1) {
 462                 atomic_dec(&handle->stream->active);
 463                 return -EBUSY;
 464         }
 465
 466         handle->state = UVC_HANDLE_ACTIVE;
 467         return 0;
 468 }
 469
 470 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 471 {
 472         if (handle->state == UVC_HANDLE_ACTIVE)
 473                 atomic_dec(&handle->stream->active);
 474
 475         handle->state = UVC_HANDLE_PASSIVE;
 476 }
 477
 478 static int uvc_has_privileges(struct uvc_fh *handle)
 479 {
 480         return handle->state == UVC_HANDLE_ACTIVE;
 481 }
 482
 483 /* ------------------------------------------------------------------------
 484  * V4L2 file operations
 485  */
 486
 487 static int uvc_v4l2_open(struct file *file)
 488 {
 489         struct uvc_streaming *stream;
 490         struct uvc_fh *handle;
 491         int ret = 0;
 492
 493         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 494         stream = video_drvdata(file);
 495
 496         ret = usb_autopm_get_interface(stream->dev->intf);
 497         if (ret < 0)
 498                 return ret;
 499
 500         /* Create the device handle. */
 501         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 502         if (handle == NULL) {
 503                 usb_autopm_put_interface(stream->dev->intf);
 504                 return -ENOMEM;
 505         }
 506
 507         mutex_lock(&stream->dev->lock);
 508         if (stream->dev->users == 0) {
 509                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 510                 if (ret < 0) {
 511                         mutex_unlock(&stream->dev->lock);
 512                         usb_autopm_put_interface(stream->dev->intf);
 513                         kfree(handle);
 514                         return ret;
 515                 }
 516         }
 517
 518         stream->dev->users++;
 519         mutex_unlock(&stream->dev->lock);
 520
 521         v4l2_fh_init(&handle->vfh, &stream->vdev);
 522         v4l2_fh_add(&handle->vfh);
 523         handle->chain = stream->chain;
 524         handle->stream = stream;
 525         handle->state = UVC_HANDLE_PASSIVE;
 526         file->private_data = handle;
 527
 528         return 0;
 529 }
 530
 531 static int uvc_v4l2_release(struct file *file)
 532 {
 533         struct uvc_fh *handle = file->private_data;
 534         struct uvc_streaming *stream = handle->stream;
 535
 536         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 537
 538         /* Only free resources if this is a privileged handle. */
 539         if (uvc_has_privileges(handle))
 540                 uvc_queue_release(&stream->queue);
 541
 542         /* Release the file handle. */
 543         uvc_dismiss_privileges(handle);
 544         v4l2_fh_del(&handle->vfh);
 545         v4l2_fh_exit(&handle->vfh);
 546         kfree(handle);
 547         file->private_data = NULL;
 548
 549         mutex_lock(&stream->dev->lock);
 550         if (--stream->dev->users == 0)
 551                 uvc_status_stop(stream->dev);
 552         mutex_unlock(&stream->dev->lock);
 553
 554         usb_autopm_put_interface(stream->dev->intf);
 555         return 0;
 556 }
 557
 558 static int uvc_ioctl_querycap(struct file *file, void *fh,
 559                               struct v4l2_capability *cap)
 560 {
 561         struct video_device *vdev = video_devdata(file);
 562         struct uvc_fh *handle = file->private_data;
 563         struct uvc_video_chain *chain = handle->chain;
 564         struct uvc_streaming *stream = handle->stream;
 565
 566         strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 567         strlcpy(cap->card, vdev->name, sizeof(cap->card));
 568         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 569         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 570                           | chain->caps;
 571         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 572                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 573         else
 574                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 575
 576         return 0;
 577 }
 578
 579 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 580                               struct v4l2_fmtdesc *fmt)
 581 {
 582         struct uvc_format *format;
 583         enum v4l2_buf_type type = fmt->type;
 584         __u32 index = fmt->index;
 585
 586         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 587                 return -EINVAL;
 588
 589         memset(fmt, 0, sizeof(*fmt));
 590         fmt->index = index;
 591         fmt->type = type;
 592
 593         format = &stream->format[fmt->index];
 594         fmt->flags = 0;
 595         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 596                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 597         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 598         fmt->description[sizeof(fmt->description) - 1] = 0;
 599         fmt->pixelformat = format->fcc;
 600         return 0;
 601 }
 602
 603 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 604                                       struct v4l2_fmtdesc *fmt)
 605 {
 606         struct uvc_fh *handle = fh;
 607         struct uvc_streaming *stream = handle->stream;
 608
 609         return uvc_ioctl_enum_fmt(stream, fmt);
 610 }
 611
 612 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 613                                       struct v4l2_fmtdesc *fmt)
 614 {
 615         struct uvc_fh *handle = fh;
 616         struct uvc_streaming *stream = handle->stream;
 617
 618         return uvc_ioctl_enum_fmt(stream, fmt);
 619 }
 620
 621 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 622                                    struct v4l2_format *fmt)
 623 {
 624         struct uvc_fh *handle = fh;
 625         struct uvc_streaming *stream = handle->stream;
 626
 627         return uvc_v4l2_get_format(stream, fmt);
 628 }
 629
 630 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 631                                    struct v4l2_format *fmt)
 632 {
 633         struct uvc_fh *handle = fh;
 634         struct uvc_streaming *stream = handle->stream;
 635
 636         return uvc_v4l2_get_format(stream, fmt);
 637 }
 638
 639 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 640                                    struct v4l2_format *fmt)
 641 {
 642         struct uvc_fh *handle = fh;
 643         struct uvc_streaming *stream = handle->stream;
 644         int ret;
 645
 646         ret = uvc_acquire_privileges(handle);
 647         if (ret < 0)
 648                 return ret;
 649
 650         return uvc_v4l2_set_format(stream, fmt);
 651 }
 652
 653 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 654                                    struct v4l2_format *fmt)
 655 {
 656         struct uvc_fh *handle = fh;
 657         struct uvc_streaming *stream = handle->stream;
 658         int ret;
 659
 660         ret = uvc_acquire_privileges(handle);
 661         if (ret < 0)
 662                 return ret;
 663
 664         return uvc_v4l2_set_format(stream, fmt);
 665 }
 666
 667 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 668                                      struct v4l2_format *fmt)
 669 {
 670         struct uvc_fh *handle = fh;
 671         struct uvc_streaming *stream = handle->stream;
 672         struct uvc_streaming_control probe;
 673
 674         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 675 }
 676
 677 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 678                                      struct v4l2_format *fmt)
 679 {
 680         struct uvc_fh *handle = fh;
 681         struct uvc_streaming *stream = handle->stream;
 682         struct uvc_streaming_control probe;
 683
 684         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 685 }
 686
 687 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 688                              struct v4l2_requestbuffers *rb)
 689 {
 690         struct uvc_fh *handle = fh;
 691         struct uvc_streaming *stream = handle->stream;
 692         int ret;
 693
 694         ret = uvc_acquire_privileges(handle);
 695         if (ret < 0)
 696                 return ret;
 697
 698         mutex_lock(&stream->mutex);
 699         ret = uvc_request_buffers(&stream->queue, rb);
 700         mutex_unlock(&stream->mutex);
 701         if (ret < 0)
 702                 return ret;
 703
 704         if (ret == 0)
 705                 uvc_dismiss_privileges(handle);
 706
 707         return 0;
 708 }
 709
 710 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 711                               struct v4l2_buffer *buf)
 712 {
 713         struct uvc_fh *handle = fh;
 714         struct uvc_streaming *stream = handle->stream;
 715
 716         if (!uvc_has_privileges(handle))
 717                 return -EBUSY;
 718
 719         return uvc_query_buffer(&stream->queue, buf);
 720 }
 721
 722 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 723 {
 724         struct uvc_fh *handle = fh;
 725         struct uvc_streaming *stream = handle->stream;
 726
 727         if (!uvc_has_privileges(handle))
 728                 return -EBUSY;
 729
 730         return uvc_queue_buffer(&stream->queue, buf);
 731 }
 732
 733 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 734                             struct v4l2_exportbuffer *exp)
 735 {
 736         struct uvc_fh *handle = fh;
 737         struct uvc_streaming *stream = handle->stream;
 738
 739         if (!uvc_has_privileges(handle))
 740                 return -EBUSY;
 741
 742         return uvc_export_buffer(&stream->queue, exp);
 743 }
 744
 745 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 746 {
 747         struct uvc_fh *handle = fh;
 748         struct uvc_streaming *stream = handle->stream;
 749
 750         if (!uvc_has_privileges(handle))
 751                 return -EBUSY;
 752
 753         return uvc_dequeue_buffer(&stream->queue, buf,
 754                                   file->f_flags & O_NONBLOCK);
 755 }
 756
 757 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 758                                   struct v4l2_create_buffers *cb)
 759 {
 760         struct uvc_fh *handle = fh;
 761         struct uvc_streaming *stream = handle->stream;
 762         int ret;
 763
 764         ret = uvc_acquire_privileges(handle);
 765         if (ret < 0)
 766                 return ret;
 767
 768         return uvc_create_buffers(&stream->queue, cb);
 769 }
 770
 771 static int uvc_ioctl_streamon(struct file *file, void *fh,
 772                               enum v4l2_buf_type type)
 773 {
 774         struct uvc_fh *handle = fh;
 775         struct uvc_streaming *stream = handle->stream;
 776         int ret;
 777
 778         if (!uvc_has_privileges(handle))
 779                 return -EBUSY;
 780
 781         mutex_lock(&stream->mutex);
 782         ret = uvc_queue_streamon(&stream->queue, type);
 783         mutex_unlock(&stream->mutex);
 784
 785         return ret;
 786 }
 787
 788 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 789                                enum v4l2_buf_type type)
 790 {
 791         struct uvc_fh *handle = fh;
 792         struct uvc_streaming *stream = handle->stream;
 793
 794         if (!uvc_has_privileges(handle))
 795                 return -EBUSY;
 796
 797         mutex_lock(&stream->mutex);
 798         uvc_queue_streamoff(&stream->queue, type);
 799         mutex_unlock(&stream->mutex);
 800
 801         return 0;
 802 }
 803
 804 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 805                                 struct v4l2_input *input)
 806 {
 807         struct uvc_fh *handle = fh;
 808         struct uvc_video_chain *chain = handle->chain;
 809         const struct uvc_entity *selector = chain->selector;
 810         struct uvc_entity *iterm = NULL;
 811         u32 index = input->index;
 812         int pin = 0;
 813
 814         if (selector == NULL ||
 815             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 816                 if (index != 0)
 817                         return -EINVAL;
 818                 list_for_each_entry(iterm, &chain->entities, chain) {
 819                         if (UVC_ENTITY_IS_ITERM(iterm))
 820                                 break;
 821                 }
 822                 pin = iterm->id;
 823         } else if (index < selector->bNrInPins) {
 824                 pin = selector->baSourceID[index];
 825                 list_for_each_entry(iterm, &chain->entities, chain) {
 826                         if (!UVC_ENTITY_IS_ITERM(iterm))
 827                                 continue;
 828                         if (iterm->id == pin)
 829                                 break;
 830                 }
 831         }
 832
 833         if (iterm == NULL || iterm->id != pin)
 834                 return -EINVAL;
 835
 836         memset(input, 0, sizeof(*input));
 837         input->index = index;
 838         strlcpy(input->name, iterm->name, sizeof(input->name));
 839         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 840                 input->type = V4L2_INPUT_TYPE_CAMERA;
 841
 842         return 0;
 843 }
 844
 845 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 846 {
 847         struct uvc_fh *handle = fh;
 848         struct uvc_video_chain *chain = handle->chain;
 849         int ret;
 850         u8 i;
 851
 852         if (chain->selector == NULL ||
 853             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 854                 *input = 0;
 855                 return 0;
 856         }
 857
 858         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 859                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 860                              &i, 1);
 861         if (ret < 0)
 862                 return ret;
 863
 864         *input = i - 1;
 865         return 0;
 866 }
 867
 868 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 869 {
 870         struct uvc_fh *handle = fh;
 871         struct uvc_video_chain *chain = handle->chain;
 872         int ret;
 873         u32 i;
 874
 875         ret = uvc_acquire_privileges(handle);
 876         if (ret < 0)
 877                 return ret;
 878
 879         if (chain->selector == NULL ||
 880             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 881                 if (input)
 882                         return -EINVAL;
 883                 return 0;
 884         }
 885
 886         if (input >= chain->selector->bNrInPins)
 887                 return -EINVAL;
 888
 889         i = input + 1;
 890         return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 891                               chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 892                               &i, 1);
 893 }
 894
 895 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 896                                struct v4l2_queryctrl *qc)
 897 {
 898         struct uvc_fh *handle = fh;
 899         struct uvc_video_chain *chain = handle->chain;
 900
 901         return uvc_query_v4l2_ctrl(chain, qc);
 902 }
 903
 904 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 905                                     struct v4l2_query_ext_ctrl *qec)
 906 {
 907         struct uvc_fh *handle = fh;
 908         struct uvc_video_chain *chain = handle->chain;
 909         struct v4l2_queryctrl qc = { qec->id };
 910         int ret;
 911
 912         ret = uvc_query_v4l2_ctrl(chain, &qc);
 913         if (ret)
 914                 return ret;
 915
 916         qec->id = qc.id;
 917         qec->type = qc.type;
 918         strlcpy(qec->name, qc.name, sizeof(qec->name));
 919         qec->minimum = qc.minimum;
 920         qec->maximum = qc.maximum;
 921         qec->step = qc.step;
 922         qec->default_value = qc.default_value;
 923         qec->flags = qc.flags;
 924         qec->elem_size = 4;
 925         qec->elems = 1;
 926         qec->nr_of_dims = 0;
 927         memset(qec->dims, 0, sizeof(qec->dims));
 928         memset(qec->reserved, 0, sizeof(qec->reserved));
 929
 930         return 0;
 931 }
 932
 933 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 934                             struct v4l2_control *ctrl)
 935 {
 936         struct uvc_fh *handle = fh;
 937         struct uvc_video_chain *chain = handle->chain;
 938         struct v4l2_ext_control xctrl;
 939         int ret;
 940
 941         memset(&xctrl, 0, sizeof(xctrl));
 942         xctrl.id = ctrl->id;
 943
 944         ret = uvc_ctrl_begin(chain);
 945         if (ret < 0)
 946                 return ret;
 947
 948         ret = uvc_ctrl_get(chain, &xctrl);
 949         uvc_ctrl_rollback(handle);
 950         if (ret < 0)
 951                 return ret;
 952
 953         ctrl->value = xctrl.value;
 954         return 0;
 955 }
 956
 957 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 958                             struct v4l2_control *ctrl)
 959 {
 960         struct uvc_fh *handle = fh;
 961         struct uvc_video_chain *chain = handle->chain;
 962         struct v4l2_ext_control xctrl;
 963         int ret;
 964
 965         memset(&xctrl, 0, sizeof(xctrl));
 966         xctrl.id = ctrl->id;
 967         xctrl.value = ctrl->value;
 968
 969         ret = uvc_ctrl_begin(chain);
 970         if (ret < 0)
 971                 return ret;
 972
 973         ret = uvc_ctrl_set(chain, &xctrl);
 974         if (ret < 0) {
 975                 uvc_ctrl_rollback(handle);
 976                 return ret;
 977         }
 978
 979         ret = uvc_ctrl_commit(handle, &xctrl, 1);
 980         if (ret < 0)
 981                 return ret;
 982
 983         ctrl->value = xctrl.value;
 984         return 0;
 985 }
 986
 987 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 988                                  struct v4l2_ext_controls *ctrls)
 989 {
 990         struct uvc_fh *handle = fh;
 991         struct uvc_video_chain *chain = handle->chain;
 992         struct v4l2_ext_control *ctrl = ctrls->controls;
 993         unsigned int i;
 994         int ret;
 995
 996         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
 997                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 998                         struct v4l2_queryctrl qc = { .id = ctrl->id };
 999
1000                         ret = uvc_query_v4l2_ctrl(chain, &qc);
1001                         if (ret < 0) {
1002                                 ctrls->error_idx = i;
1003                                 return ret;
1004                         }
1005
1006                         ctrl->value = qc.default_value;
1007                 }
1008
1009                 return 0;
1010         }
1011
1012         ret = uvc_ctrl_begin(chain);
1013         if (ret < 0)
1014                 return ret;
1015
1016         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1017                 ret = uvc_ctrl_get(chain, ctrl);
1018                 if (ret < 0) {
1019                         uvc_ctrl_rollback(handle);
1020                         ctrls->error_idx = i;
1021                         return ret;
1022                 }
1023         }
1024
1025         ctrls->error_idx = 0;
1026
1027         return uvc_ctrl_rollback(handle);
1028 }
1029
1030 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1031                                      struct v4l2_ext_controls *ctrls,
1032                                      bool commit)
1033 {
1034         struct v4l2_ext_control *ctrl = ctrls->controls;
1035         struct uvc_video_chain *chain = handle->chain;
1036         unsigned int i;
1037         int ret;
1038
1039         /* Default value cannot be changed */
1040         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1041                 return -EINVAL;
1042
1043         ret = uvc_ctrl_begin(chain);
1044         if (ret < 0)
1045                 return ret;
1046
1047         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1048                 ret = uvc_ctrl_set(chain, ctrl);
1049                 if (ret < 0) {
1050                         uvc_ctrl_rollback(handle);
1051                         ctrls->error_idx = commit ? ctrls->count : i;
1052                         return ret;
1053                 }
1054         }
1055
1056         ctrls->error_idx = 0;
1057
1058         if (commit)
1059                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1060         else
1061                 return uvc_ctrl_rollback(handle);
1062 }
1063
1064 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1065                                  struct v4l2_ext_controls *ctrls)
1066 {
1067         struct uvc_fh *handle = fh;
1068
1069         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1070 }
1071
1072 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1073                                    struct v4l2_ext_controls *ctrls)
1074 {
1075         struct uvc_fh *handle = fh;
1076
1077         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1078 }
1079
1080 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1081                                struct v4l2_querymenu *qm)
1082 {
1083         struct uvc_fh *handle = fh;
1084         struct uvc_video_chain *chain = handle->chain;
1085
1086         return uvc_query_v4l2_menu(chain, qm);
1087 }
1088
1089 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1090                                  struct v4l2_selection *sel)
1091 {
1092         struct uvc_fh *handle = fh;
1093         struct uvc_streaming *stream = handle->stream;
1094
1095         if (sel->type != stream->type)
1096                 return -EINVAL;
1097
1098         switch (sel->target) {
1099         case V4L2_SEL_TGT_CROP_DEFAULT:
1100         case V4L2_SEL_TGT_CROP_BOUNDS:
1101                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1102                         return -EINVAL;
1103                 break;
1104         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1105         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1106                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1107                         return -EINVAL;
1108                 break;
1109         default:
1110                 return -EINVAL;
1111         }
1112
1113         sel->r.left = 0;
1114         sel->r.top = 0;
1115         mutex_lock(&stream->mutex);
1116         sel->r.width = stream->cur_frame->wWidth;
1117         sel->r.height = stream->cur_frame->wHeight;
1118         mutex_unlock(&stream->mutex);
1119
1120         return 0;
1121 }
1122
1123 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1124                             struct v4l2_streamparm *parm)
1125 {
1126         struct uvc_fh *handle = fh;
1127         struct uvc_streaming *stream = handle->stream;
1128
1129         return uvc_v4l2_get_streamparm(stream, parm);
1130 }
1131
1132 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1133                             struct v4l2_streamparm *parm)
1134 {
1135         struct uvc_fh *handle = fh;
1136         struct uvc_streaming *stream = handle->stream;
1137         int ret;
1138
1139         ret = uvc_acquire_privileges(handle);
1140         if (ret < 0)
1141                 return ret;
1142
1143         return uvc_v4l2_set_streamparm(stream, parm);
1144 }
1145
1146 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1147                                      struct v4l2_frmsizeenum *fsize)
1148 {
1149         struct uvc_fh *handle = fh;
1150         struct uvc_streaming *stream = handle->stream;
1151         struct uvc_format *format = NULL;
1152         struct uvc_frame *frame;
1153         int i;
1154
1155         /* Look for the given pixel format */
1156         for (i = 0; i < stream->nformats; i++) {
1157                 if (stream->format[i].fcc == fsize->pixel_format) {
1158                         format = &stream->format[i];
1159                         break;
1160                 }
1161         }
1162         if (format == NULL)
1163                 return -EINVAL;
1164
1165         if (fsize->index >= format->nframes)
1166                 return -EINVAL;
1167
1168         frame = &format->frame[fsize->index];
1169         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1170         fsize->discrete.width = frame->wWidth;
1171         fsize->discrete.height = frame->wHeight;
1172         return 0;
1173 }
1174
1175 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1176                                          struct v4l2_frmivalenum *fival)
1177 {
1178         struct uvc_fh *handle = fh;
1179         struct uvc_streaming *stream = handle->stream;
1180         struct uvc_format *format = NULL;
1181         struct uvc_frame *frame = NULL;
1182         int i;
1183
1184         /* Look for the given pixel format and frame size */
1185         for (i = 0; i < stream->nformats; i++) {
1186                 if (stream->format[i].fcc == fival->pixel_format) {
1187                         format = &stream->format[i];
1188                         break;
1189                 }
1190         }
1191         if (format == NULL)
1192                 return -EINVAL;
1193
1194         for (i = 0; i < format->nframes; i++) {
1195                 if (format->frame[i].wWidth == fival->width &&
1196                     format->frame[i].wHeight == fival->height) {
1197                         frame = &format->frame[i];
1198                         break;
1199                 }
1200         }
1201         if (frame == NULL)
1202                 return -EINVAL;
1203
1204         if (frame->bFrameIntervalType) {
1205                 if (fival->index >= frame->bFrameIntervalType)
1206                         return -EINVAL;
1207
1208                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1209                 fival->discrete.numerator =
1210                         frame->dwFrameInterval[fival->index];
1211                 fival->discrete.denominator = 10000000;
1212                 uvc_simplify_fraction(&fival->discrete.numerator,
1213                         &fival->discrete.denominator, 8, 333);
1214         } else {
1215                 if (fival->index)
1216                         return -EINVAL;
1217
1218                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1219                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1220                 fival->stepwise.min.denominator = 10000000;
1221                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1222                 fival->stepwise.max.denominator = 10000000;
1223                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1224                 fival->stepwise.step.denominator = 10000000;
1225                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1226                         &fival->stepwise.min.denominator, 8, 333);
1227                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1228                         &fival->stepwise.max.denominator, 8, 333);
1229                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1230                         &fival->stepwise.step.denominator, 8, 333);
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1237                                      const struct v4l2_event_subscription *sub)
1238 {
1239         switch (sub->type) {
1240         case V4L2_EVENT_CTRL:
1241                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1242         default:
1243                 return -EINVAL;
1244         }
1245 }
1246
1247 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1248                               unsigned int cmd, void *arg)
1249 {
1250         struct uvc_fh *handle = fh;
1251         struct uvc_video_chain *chain = handle->chain;
1252
1253         switch (cmd) {
1254         /* Dynamic controls. */
1255         case UVCIOC_CTRL_MAP:
1256                 return uvc_ioctl_ctrl_map(chain, arg);
1257
1258         case UVCIOC_CTRL_QUERY:
1259                 return uvc_xu_ctrl_query(chain, arg);
1260
1261         default:
1262                 return -ENOTTY;
1263         }
1264 }
1265
1266 #ifdef CONFIG_COMPAT
1267 struct uvc_xu_control_mapping32 {
1268         __u32 id;
1269         __u8 name[32];
1270         __u8 entity[16];
1271         __u8 selector;
1272
1273         __u8 size;
1274         __u8 offset;
1275         __u32 v4l2_type;
1276         __u32 data_type;
1277
1278         compat_caddr_t menu_info;
1279         __u32 menu_count;
1280
1281         __u32 reserved[4];
1282 };
1283
1284 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1285                         const struct uvc_xu_control_mapping32 __user *up)
1286 {
1287         compat_caddr_t p;
1288
1289         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1290             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1291             __get_user(kp->menu_count, &up->menu_count))
1292                 return -EFAULT;
1293
1294         memset(kp->reserved, 0, sizeof(kp->reserved));
1295
1296         if (kp->menu_count == 0) {
1297                 kp->menu_info = NULL;
1298                 return 0;
1299         }
1300
1301         if (__get_user(p, &up->menu_info))
1302                 return -EFAULT;
1303         kp->menu_info = compat_ptr(p);
1304
1305         return 0;
1306 }
1307
1308 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1309                         struct uvc_xu_control_mapping32 __user *up)
1310 {
1311         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1312             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1313             __put_user(kp->menu_count, &up->menu_count))
1314                 return -EFAULT;
1315
1316         if (__clear_user(up->reserved, sizeof(up->reserved)))
1317                 return -EFAULT;
1318
1319         return 0;
1320 }
1321
1322 struct uvc_xu_control_query32 {
1323         __u8 unit;
1324         __u8 selector;
1325         __u8 query;
1326         __u16 size;
1327         compat_caddr_t data;
1328 };
1329
1330 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1331                         const struct uvc_xu_control_query32 __user *up)
1332 {
1333         compat_caddr_t p;
1334
1335         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1336             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1337                 return -EFAULT;
1338
1339         if (kp->size == 0) {
1340                 kp->data = NULL;
1341                 return 0;
1342         }
1343
1344         if (__get_user(p, &up->data))
1345                 return -EFAULT;
1346         kp->data = compat_ptr(p);
1347
1348         return 0;
1349 }
1350
1351 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1352                         struct uvc_xu_control_query32 __user *up)
1353 {
1354         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1355             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1356                 return -EFAULT;
1357
1358         return 0;
1359 }
1360
1361 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1362 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1363
1364 static long uvc_v4l2_compat_ioctl32(struct file *file,
1365                      unsigned int cmd, unsigned long arg)
1366 {
1367         struct uvc_fh *handle = file->private_data;
1368         union {
1369                 struct uvc_xu_control_mapping xmap;
1370                 struct uvc_xu_control_query xqry;
1371         } karg;
1372         void __user *up = compat_ptr(arg);
1373         long ret;
1374
1375         switch (cmd) {
1376         case UVCIOC_CTRL_MAP32:
1377                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1378                 if (ret)
1379                         return ret;
1380                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1381                 if (ret)
1382                         return ret;
1383                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1384                 if (ret)
1385                         return ret;
1386
1387                 break;
1388
1389         case UVCIOC_CTRL_QUERY32:
1390                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1391                 if (ret)
1392                         return ret;
1393                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1394                 if (ret)
1395                         return ret;
1396                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1397                 if (ret)
1398                         return ret;
1399                 break;
1400
1401         default:
1402                 return -ENOIOCTLCMD;
1403         }
1404
1405         return ret;
1406 }
1407 #endif
1408
1409 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1410                     size_t count, loff_t *ppos)
1411 {
1412         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1413         return -EINVAL;
1414 }
1415
1416 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1417 {
1418         struct uvc_fh *handle = file->private_data;
1419         struct uvc_streaming *stream = handle->stream;
1420
1421         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1422
1423         return uvc_queue_mmap(&stream->queue, vma);
1424 }
1425
1426 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1427 {
1428         struct uvc_fh *handle = file->private_data;
1429         struct uvc_streaming *stream = handle->stream;
1430
1431         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1432
1433         return uvc_queue_poll(&stream->queue, file, wait);
1434 }
1435
1436 #ifndef CONFIG_MMU
1437 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1438                 unsigned long addr, unsigned long len, unsigned long pgoff,
1439                 unsigned long flags)
1440 {
1441         struct uvc_fh *handle = file->private_data;
1442         struct uvc_streaming *stream = handle->stream;
1443
1444         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1445
1446         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1447 }
1448 #endif
1449
1450 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1451         .vidioc_querycap = uvc_ioctl_querycap,
1452         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1453         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1454         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1455         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1456         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1457         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1458         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1459         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1460         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1461         .vidioc_querybuf = uvc_ioctl_querybuf,
1462         .vidioc_qbuf = uvc_ioctl_qbuf,
1463         .vidioc_expbuf = uvc_ioctl_expbuf,
1464         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1465         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1466         .vidioc_streamon = uvc_ioctl_streamon,
1467         .vidioc_streamoff = uvc_ioctl_streamoff,
1468         .vidioc_enum_input = uvc_ioctl_enum_input,
1469         .vidioc_g_input = uvc_ioctl_g_input,
1470         .vidioc_s_input = uvc_ioctl_s_input,
1471         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1472         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1473         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1474         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1475         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1476         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1477         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1478         .vidioc_querymenu = uvc_ioctl_querymenu,
1479         .vidioc_g_selection = uvc_ioctl_g_selection,
1480         .vidioc_g_parm = uvc_ioctl_g_parm,
1481         .vidioc_s_parm = uvc_ioctl_s_parm,
1482         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1483         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1484         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1485         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1486         .vidioc_default = uvc_ioctl_default,
1487 };
1488
1489 const struct v4l2_file_operations uvc_fops = {
1490         .owner          = THIS_MODULE,
1491         .open           = uvc_v4l2_open,
1492         .release        = uvc_v4l2_release,
1493         .unlocked_ioctl = video_ioctl2,
1494 #ifdef CONFIG_COMPAT
1495         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1496 #endif
1497         .read           = uvc_v4l2_read,
1498         .mmap           = uvc_v4l2_mmap,
1499         .poll           = uvc_v4l2_poll,
1500 #ifndef CONFIG_MMU
1501         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1502 #endif
1503 };
1504