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/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
 572         return 0;
 573 }
 574
 575 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 576                               struct v4l2_fmtdesc *fmt)
 577 {
 578         struct uvc_format *format;
 579         enum v4l2_buf_type type = fmt->type;
 580         __u32 index = fmt->index;
 581
 582         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 583                 return -EINVAL;
 584
 585         memset(fmt, 0, sizeof(*fmt));
 586         fmt->index = index;
 587         fmt->type = type;
 588
 589         format = &stream->format[fmt->index];
 590         fmt->flags = 0;
 591         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 592                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 593         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 594         fmt->description[sizeof(fmt->description) - 1] = 0;
 595         fmt->pixelformat = format->fcc;
 596         return 0;
 597 }
 598
 599 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 600                                       struct v4l2_fmtdesc *fmt)
 601 {
 602         struct uvc_fh *handle = fh;
 603         struct uvc_streaming *stream = handle->stream;
 604
 605         return uvc_ioctl_enum_fmt(stream, fmt);
 606 }
 607
 608 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 609                                       struct v4l2_fmtdesc *fmt)
 610 {
 611         struct uvc_fh *handle = fh;
 612         struct uvc_streaming *stream = handle->stream;
 613
 614         return uvc_ioctl_enum_fmt(stream, fmt);
 615 }
 616
 617 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 618                                    struct v4l2_format *fmt)
 619 {
 620         struct uvc_fh *handle = fh;
 621         struct uvc_streaming *stream = handle->stream;
 622
 623         return uvc_v4l2_get_format(stream, fmt);
 624 }
 625
 626 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 627                                    struct v4l2_format *fmt)
 628 {
 629         struct uvc_fh *handle = fh;
 630         struct uvc_streaming *stream = handle->stream;
 631
 632         return uvc_v4l2_get_format(stream, fmt);
 633 }
 634
 635 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 636                                    struct v4l2_format *fmt)
 637 {
 638         struct uvc_fh *handle = fh;
 639         struct uvc_streaming *stream = handle->stream;
 640         int ret;
 641
 642         ret = uvc_acquire_privileges(handle);
 643         if (ret < 0)
 644                 return ret;
 645
 646         return uvc_v4l2_set_format(stream, fmt);
 647 }
 648
 649 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 650                                    struct v4l2_format *fmt)
 651 {
 652         struct uvc_fh *handle = fh;
 653         struct uvc_streaming *stream = handle->stream;
 654         int ret;
 655
 656         ret = uvc_acquire_privileges(handle);
 657         if (ret < 0)
 658                 return ret;
 659
 660         return uvc_v4l2_set_format(stream, fmt);
 661 }
 662
 663 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 664                                      struct v4l2_format *fmt)
 665 {
 666         struct uvc_fh *handle = fh;
 667         struct uvc_streaming *stream = handle->stream;
 668         struct uvc_streaming_control probe;
 669
 670         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 671 }
 672
 673 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 674                                      struct v4l2_format *fmt)
 675 {
 676         struct uvc_fh *handle = fh;
 677         struct uvc_streaming *stream = handle->stream;
 678         struct uvc_streaming_control probe;
 679
 680         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 681 }
 682
 683 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 684                              struct v4l2_requestbuffers *rb)
 685 {
 686         struct uvc_fh *handle = fh;
 687         struct uvc_streaming *stream = handle->stream;
 688         int ret;
 689
 690         ret = uvc_acquire_privileges(handle);
 691         if (ret < 0)
 692                 return ret;
 693
 694         mutex_lock(&stream->mutex);
 695         ret = uvc_request_buffers(&stream->queue, rb);
 696         mutex_unlock(&stream->mutex);
 697         if (ret < 0)
 698                 return ret;
 699
 700         if (ret == 0)
 701                 uvc_dismiss_privileges(handle);
 702
 703         return 0;
 704 }
 705
 706 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 707                               struct v4l2_buffer *buf)
 708 {
 709         struct uvc_fh *handle = fh;
 710         struct uvc_streaming *stream = handle->stream;
 711
 712         if (!uvc_has_privileges(handle))
 713                 return -EBUSY;
 714
 715         return uvc_query_buffer(&stream->queue, buf);
 716 }
 717
 718 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 719 {
 720         struct uvc_fh *handle = fh;
 721         struct uvc_streaming *stream = handle->stream;
 722
 723         if (!uvc_has_privileges(handle))
 724                 return -EBUSY;
 725
 726         return uvc_queue_buffer(&stream->queue, buf);
 727 }
 728
 729 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 730                             struct v4l2_exportbuffer *exp)
 731 {
 732         struct uvc_fh *handle = fh;
 733         struct uvc_streaming *stream = handle->stream;
 734
 735         if (!uvc_has_privileges(handle))
 736                 return -EBUSY;
 737
 738         return uvc_export_buffer(&stream->queue, exp);
 739 }
 740
 741 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 742 {
 743         struct uvc_fh *handle = fh;
 744         struct uvc_streaming *stream = handle->stream;
 745
 746         if (!uvc_has_privileges(handle))
 747                 return -EBUSY;
 748
 749         return uvc_dequeue_buffer(&stream->queue, buf,
 750                                   file->f_flags & O_NONBLOCK);
 751 }
 752
 753 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 754                                   struct v4l2_create_buffers *cb)
 755 {
 756         struct uvc_fh *handle = fh;
 757         struct uvc_streaming *stream = handle->stream;
 758         int ret;
 759
 760         ret = uvc_acquire_privileges(handle);
 761         if (ret < 0)
 762                 return ret;
 763
 764         return uvc_create_buffers(&stream->queue, cb);
 765 }
 766
 767 static int uvc_ioctl_streamon(struct file *file, void *fh,
 768                               enum v4l2_buf_type type)
 769 {
 770         struct uvc_fh *handle = fh;
 771         struct uvc_streaming *stream = handle->stream;
 772         int ret;
 773
 774         if (!uvc_has_privileges(handle))
 775                 return -EBUSY;
 776
 777         mutex_lock(&stream->mutex);
 778         ret = uvc_queue_streamon(&stream->queue, type);
 779         mutex_unlock(&stream->mutex);
 780
 781         return ret;
 782 }
 783
 784 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 785                                enum v4l2_buf_type type)
 786 {
 787         struct uvc_fh *handle = fh;
 788         struct uvc_streaming *stream = handle->stream;
 789
 790         if (!uvc_has_privileges(handle))
 791                 return -EBUSY;
 792
 793         mutex_lock(&stream->mutex);
 794         uvc_queue_streamoff(&stream->queue, type);
 795         mutex_unlock(&stream->mutex);
 796
 797         return 0;
 798 }
 799
 800 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 801                                 struct v4l2_input *input)
 802 {
 803         struct uvc_fh *handle = fh;
 804         struct uvc_video_chain *chain = handle->chain;
 805         const struct uvc_entity *selector = chain->selector;
 806         struct uvc_entity *iterm = NULL;
 807         u32 index = input->index;
 808         int pin = 0;
 809
 810         if (selector == NULL ||
 811             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 812                 if (index != 0)
 813                         return -EINVAL;
 814                 list_for_each_entry(iterm, &chain->entities, chain) {
 815                         if (UVC_ENTITY_IS_ITERM(iterm))
 816                                 break;
 817                 }
 818                 pin = iterm->id;
 819         } else if (index < selector->bNrInPins) {
 820                 pin = selector->baSourceID[index];
 821                 list_for_each_entry(iterm, &chain->entities, chain) {
 822                         if (!UVC_ENTITY_IS_ITERM(iterm))
 823                                 continue;
 824                         if (iterm->id == pin)
 825                                 break;
 826                 }
 827         }
 828
 829         if (iterm == NULL || iterm->id != pin)
 830                 return -EINVAL;
 831
 832         memset(input, 0, sizeof(*input));
 833         input->index = index;
 834         strlcpy(input->name, iterm->name, sizeof(input->name));
 835         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 836                 input->type = V4L2_INPUT_TYPE_CAMERA;
 837
 838         return 0;
 839 }
 840
 841 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 842 {
 843         struct uvc_fh *handle = fh;
 844         struct uvc_video_chain *chain = handle->chain;
 845         int ret;
 846         u8 i;
 847
 848         if (chain->selector == NULL ||
 849             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 850                 *input = 0;
 851                 return 0;
 852         }
 853
 854         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 855                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 856                              &i, 1);
 857         if (ret < 0)
 858                 return ret;
 859
 860         *input = i - 1;
 861         return 0;
 862 }
 863
 864 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 865 {
 866         struct uvc_fh *handle = fh;
 867         struct uvc_video_chain *chain = handle->chain;
 868         int ret;
 869         u32 i;
 870
 871         ret = uvc_acquire_privileges(handle);
 872         if (ret < 0)
 873                 return ret;
 874
 875         if (chain->selector == NULL ||
 876             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 877                 if (input)
 878                         return -EINVAL;
 879                 return 0;
 880         }
 881
 882         if (input >= chain->selector->bNrInPins)
 883                 return -EINVAL;
 884
 885         i = input + 1;
 886         return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 887                               chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 888                               &i, 1);
 889 }
 890
 891 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 892                                struct v4l2_queryctrl *qc)
 893 {
 894         struct uvc_fh *handle = fh;
 895         struct uvc_video_chain *chain = handle->chain;
 896
 897         return uvc_query_v4l2_ctrl(chain, qc);
 898 }
 899
 900 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 901                                     struct v4l2_query_ext_ctrl *qec)
 902 {
 903         struct uvc_fh *handle = fh;
 904         struct uvc_video_chain *chain = handle->chain;
 905         struct v4l2_queryctrl qc = { qec->id };
 906         int ret;
 907
 908         ret = uvc_query_v4l2_ctrl(chain, &qc);
 909         if (ret)
 910                 return ret;
 911
 912         qec->id = qc.id;
 913         qec->type = qc.type;
 914         strlcpy(qec->name, qc.name, sizeof(qec->name));
 915         qec->minimum = qc.minimum;
 916         qec->maximum = qc.maximum;
 917         qec->step = qc.step;
 918         qec->default_value = qc.default_value;
 919         qec->flags = qc.flags;
 920         qec->elem_size = 4;
 921         qec->elems = 1;
 922         qec->nr_of_dims = 0;
 923         memset(qec->dims, 0, sizeof(qec->dims));
 924         memset(qec->reserved, 0, sizeof(qec->reserved));
 925
 926         return 0;
 927 }
 928
 929 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 930                             struct v4l2_control *ctrl)
 931 {
 932         struct uvc_fh *handle = fh;
 933         struct uvc_video_chain *chain = handle->chain;
 934         struct v4l2_ext_control xctrl;
 935         int ret;
 936
 937         memset(&xctrl, 0, sizeof(xctrl));
 938         xctrl.id = ctrl->id;
 939
 940         ret = uvc_ctrl_begin(chain);
 941         if (ret < 0)
 942                 return ret;
 943
 944         ret = uvc_ctrl_get(chain, &xctrl);
 945         uvc_ctrl_rollback(handle);
 946         if (ret < 0)
 947                 return ret;
 948
 949         ctrl->value = xctrl.value;
 950         return 0;
 951 }
 952
 953 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 954                             struct v4l2_control *ctrl)
 955 {
 956         struct uvc_fh *handle = fh;
 957         struct uvc_video_chain *chain = handle->chain;
 958         struct v4l2_ext_control xctrl;
 959         int ret;
 960
 961         memset(&xctrl, 0, sizeof(xctrl));
 962         xctrl.id = ctrl->id;
 963         xctrl.value = ctrl->value;
 964
 965         ret = uvc_ctrl_begin(chain);
 966         if (ret < 0)
 967                 return ret;
 968
 969         ret = uvc_ctrl_set(chain, &xctrl);
 970         if (ret < 0) {
 971                 uvc_ctrl_rollback(handle);
 972                 return ret;
 973         }
 974
 975         ret = uvc_ctrl_commit(handle, &xctrl, 1);
 976         if (ret < 0)
 977                 return ret;
 978
 979         ctrl->value = xctrl.value;
 980         return 0;
 981 }
 982
 983 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 984                                  struct v4l2_ext_controls *ctrls)
 985 {
 986         struct uvc_fh *handle = fh;
 987         struct uvc_video_chain *chain = handle->chain;
 988         struct v4l2_ext_control *ctrl = ctrls->controls;
 989         unsigned int i;
 990         int ret;
 991
 992         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
 993                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 994                         struct v4l2_queryctrl qc = { .id = ctrl->id };
 995
 996                         ret = uvc_query_v4l2_ctrl(chain, &qc);
 997                         if (ret < 0) {
 998                                 ctrls->error_idx = i;
 999                                 return ret;
1000                         }
1001
1002                         ctrl->value = qc.default_value;
1003                 }
1004
1005                 return 0;
1006         }
1007
1008         ret = uvc_ctrl_begin(chain);
1009         if (ret < 0)
1010                 return ret;
1011
1012         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1013                 ret = uvc_ctrl_get(chain, ctrl);
1014                 if (ret < 0) {
1015                         uvc_ctrl_rollback(handle);
1016                         ctrls->error_idx = i;
1017                         return ret;
1018                 }
1019         }
1020
1021         ctrls->error_idx = 0;
1022
1023         return uvc_ctrl_rollback(handle);
1024 }
1025
1026 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1027                                      struct v4l2_ext_controls *ctrls,
1028                                      bool commit)
1029 {
1030         struct v4l2_ext_control *ctrl = ctrls->controls;
1031         struct uvc_video_chain *chain = handle->chain;
1032         unsigned int i;
1033         int ret;
1034
1035         /* Default value cannot be changed */
1036         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1037                 return -EINVAL;
1038
1039         ret = uvc_ctrl_begin(chain);
1040         if (ret < 0)
1041                 return ret;
1042
1043         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1044                 ret = uvc_ctrl_set(chain, ctrl);
1045                 if (ret < 0) {
1046                         uvc_ctrl_rollback(handle);
1047                         ctrls->error_idx = commit ? ctrls->count : i;
1048                         return ret;
1049                 }
1050         }
1051
1052         ctrls->error_idx = 0;
1053
1054         if (commit)
1055                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1056         else
1057                 return uvc_ctrl_rollback(handle);
1058 }
1059
1060 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1061                                  struct v4l2_ext_controls *ctrls)
1062 {
1063         struct uvc_fh *handle = fh;
1064
1065         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1066 }
1067
1068 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1069                                    struct v4l2_ext_controls *ctrls)
1070 {
1071         struct uvc_fh *handle = fh;
1072
1073         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1074 }
1075
1076 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1077                                struct v4l2_querymenu *qm)
1078 {
1079         struct uvc_fh *handle = fh;
1080         struct uvc_video_chain *chain = handle->chain;
1081
1082         return uvc_query_v4l2_menu(chain, qm);
1083 }
1084
1085 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1086                                  struct v4l2_selection *sel)
1087 {
1088         struct uvc_fh *handle = fh;
1089         struct uvc_streaming *stream = handle->stream;
1090
1091         if (sel->type != stream->type)
1092                 return -EINVAL;
1093
1094         switch (sel->target) {
1095         case V4L2_SEL_TGT_CROP_DEFAULT:
1096         case V4L2_SEL_TGT_CROP_BOUNDS:
1097                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1098                         return -EINVAL;
1099                 break;
1100         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1101         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1102                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1103                         return -EINVAL;
1104                 break;
1105         default:
1106                 return -EINVAL;
1107         }
1108
1109         sel->r.left = 0;
1110         sel->r.top = 0;
1111         mutex_lock(&stream->mutex);
1112         sel->r.width = stream->cur_frame->wWidth;
1113         sel->r.height = stream->cur_frame->wHeight;
1114         mutex_unlock(&stream->mutex);
1115
1116         return 0;
1117 }
1118
1119 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1120                             struct v4l2_streamparm *parm)
1121 {
1122         struct uvc_fh *handle = fh;
1123         struct uvc_streaming *stream = handle->stream;
1124
1125         return uvc_v4l2_get_streamparm(stream, parm);
1126 }
1127
1128 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1129                             struct v4l2_streamparm *parm)
1130 {
1131         struct uvc_fh *handle = fh;
1132         struct uvc_streaming *stream = handle->stream;
1133         int ret;
1134
1135         ret = uvc_acquire_privileges(handle);
1136         if (ret < 0)
1137                 return ret;
1138
1139         return uvc_v4l2_set_streamparm(stream, parm);
1140 }
1141
1142 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1143                                      struct v4l2_frmsizeenum *fsize)
1144 {
1145         struct uvc_fh *handle = fh;
1146         struct uvc_streaming *stream = handle->stream;
1147         struct uvc_format *format = NULL;
1148         struct uvc_frame *frame;
1149         int i;
1150
1151         /* Look for the given pixel format */
1152         for (i = 0; i < stream->nformats; i++) {
1153                 if (stream->format[i].fcc == fsize->pixel_format) {
1154                         format = &stream->format[i];
1155                         break;
1156                 }
1157         }
1158         if (format == NULL)
1159                 return -EINVAL;
1160
1161         if (fsize->index >= format->nframes)
1162                 return -EINVAL;
1163
1164         frame = &format->frame[fsize->index];
1165         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1166         fsize->discrete.width = frame->wWidth;
1167         fsize->discrete.height = frame->wHeight;
1168         return 0;
1169 }
1170
1171 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1172                                          struct v4l2_frmivalenum *fival)
1173 {
1174         struct uvc_fh *handle = fh;
1175         struct uvc_streaming *stream = handle->stream;
1176         struct uvc_format *format = NULL;
1177         struct uvc_frame *frame = NULL;
1178         int i;
1179
1180         /* Look for the given pixel format and frame size */
1181         for (i = 0; i < stream->nformats; i++) {
1182                 if (stream->format[i].fcc == fival->pixel_format) {
1183                         format = &stream->format[i];
1184                         break;
1185                 }
1186         }
1187         if (format == NULL)
1188                 return -EINVAL;
1189
1190         for (i = 0; i < format->nframes; i++) {
1191                 if (format->frame[i].wWidth == fival->width &&
1192                     format->frame[i].wHeight == fival->height) {
1193                         frame = &format->frame[i];
1194                         break;
1195                 }
1196         }
1197         if (frame == NULL)
1198                 return -EINVAL;
1199
1200         if (frame->bFrameIntervalType) {
1201                 if (fival->index >= frame->bFrameIntervalType)
1202                         return -EINVAL;
1203
1204                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1205                 fival->discrete.numerator =
1206                         frame->dwFrameInterval[fival->index];
1207                 fival->discrete.denominator = 10000000;
1208                 uvc_simplify_fraction(&fival->discrete.numerator,
1209                         &fival->discrete.denominator, 8, 333);
1210         } else {
1211                 if (fival->index)
1212                         return -EINVAL;
1213
1214                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1215                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1216                 fival->stepwise.min.denominator = 10000000;
1217                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1218                 fival->stepwise.max.denominator = 10000000;
1219                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1220                 fival->stepwise.step.denominator = 10000000;
1221                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1222                         &fival->stepwise.min.denominator, 8, 333);
1223                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1224                         &fival->stepwise.max.denominator, 8, 333);
1225                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1226                         &fival->stepwise.step.denominator, 8, 333);
1227         }
1228
1229         return 0;
1230 }
1231
1232 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1233                                      const struct v4l2_event_subscription *sub)
1234 {
1235         switch (sub->type) {
1236         case V4L2_EVENT_CTRL:
1237                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1238         default:
1239                 return -EINVAL;
1240         }
1241 }
1242
1243 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1244                               unsigned int cmd, void *arg)
1245 {
1246         struct uvc_fh *handle = fh;
1247         struct uvc_video_chain *chain = handle->chain;
1248
1249         switch (cmd) {
1250         /* Dynamic controls. */
1251         case UVCIOC_CTRL_MAP:
1252                 return uvc_ioctl_ctrl_map(chain, arg);
1253
1254         case UVCIOC_CTRL_QUERY:
1255                 return uvc_xu_ctrl_query(chain, arg);
1256
1257         default:
1258                 return -ENOTTY;
1259         }
1260 }
1261
1262 #ifdef CONFIG_COMPAT
1263 struct uvc_xu_control_mapping32 {
1264         __u32 id;
1265         __u8 name[32];
1266         __u8 entity[16];
1267         __u8 selector;
1268
1269         __u8 size;
1270         __u8 offset;
1271         __u32 v4l2_type;
1272         __u32 data_type;
1273
1274         compat_caddr_t menu_info;
1275         __u32 menu_count;
1276
1277         __u32 reserved[4];
1278 };
1279
1280 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1281                         const struct uvc_xu_control_mapping32 __user *up)
1282 {
1283         struct uvc_xu_control_mapping32 *p = (void *)kp;
1284         compat_caddr_t info;
1285         u32 count;
1286
1287         if (copy_from_user(p, up, sizeof(*p)))
1288                 return -EFAULT;
1289
1290         count = p->menu_count;
1291         info = p->menu_info;
1292
1293         memset(kp->reserved, 0, sizeof(kp->reserved));
1294         kp->menu_info = count ? compat_ptr(info) : NULL;
1295         kp->menu_count = count;
1296         return 0;
1297 }
1298
1299 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1300                         struct uvc_xu_control_mapping32 __user *up)
1301 {
1302         if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1303             put_user(kp->menu_count, &up->menu_count))
1304                 return -EFAULT;
1305
1306         if (clear_user(up->reserved, sizeof(up->reserved)))
1307                 return -EFAULT;
1308
1309         return 0;
1310 }
1311
1312 struct uvc_xu_control_query32 {
1313         __u8 unit;
1314         __u8 selector;
1315         __u8 query;
1316         __u16 size;
1317         compat_caddr_t data;
1318 };
1319
1320 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1321                         const struct uvc_xu_control_query32 __user *up)
1322 {
1323         struct uvc_xu_control_query32 v;
1324
1325         if (copy_from_user(&v, up, sizeof(v)))
1326                 return -EFAULT;
1327
1328         *kp = (struct uvc_xu_control_query){
1329                 .unit = v.unit,
1330                 .selector = v.selector,
1331                 .query = v.query,
1332                 .size = v.size,
1333                 .data = v.size ? compat_ptr(v.data) : NULL
1334         };
1335         return 0;
1336 }
1337
1338 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1339                         struct uvc_xu_control_query32 __user *up)
1340 {
1341         if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
1342                 return -EFAULT;
1343         return 0;
1344 }
1345
1346 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1347 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1348
1349 static long uvc_v4l2_compat_ioctl32(struct file *file,
1350                      unsigned int cmd, unsigned long arg)
1351 {
1352         struct uvc_fh *handle = file->private_data;
1353         union {
1354                 struct uvc_xu_control_mapping xmap;
1355                 struct uvc_xu_control_query xqry;
1356         } karg;
1357         void __user *up = compat_ptr(arg);
1358         long ret;
1359
1360         switch (cmd) {
1361         case UVCIOC_CTRL_MAP32:
1362                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1363                 if (ret)
1364                         return ret;
1365                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1366                 if (ret)
1367                         return ret;
1368                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1369                 if (ret)
1370                         return ret;
1371
1372                 break;
1373
1374         case UVCIOC_CTRL_QUERY32:
1375                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1376                 if (ret)
1377                         return ret;
1378                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1379                 if (ret)
1380                         return ret;
1381                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1382                 if (ret)
1383                         return ret;
1384                 break;
1385
1386         default:
1387                 return -ENOIOCTLCMD;
1388         }
1389
1390         return ret;
1391 }
1392 #endif
1393
1394 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1395                     size_t count, loff_t *ppos)
1396 {
1397         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1398         return -EINVAL;
1399 }
1400
1401 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1402 {
1403         struct uvc_fh *handle = file->private_data;
1404         struct uvc_streaming *stream = handle->stream;
1405
1406         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1407
1408         return uvc_queue_mmap(&stream->queue, vma);
1409 }
1410
1411 static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
1412 {
1413         struct uvc_fh *handle = file->private_data;
1414         struct uvc_streaming *stream = handle->stream;
1415
1416         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1417
1418         return uvc_queue_poll(&stream->queue, file, wait);
1419 }
1420
1421 #ifndef CONFIG_MMU
1422 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1423                 unsigned long addr, unsigned long len, unsigned long pgoff,
1424                 unsigned long flags)
1425 {
1426         struct uvc_fh *handle = file->private_data;
1427         struct uvc_streaming *stream = handle->stream;
1428
1429         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1430
1431         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1432 }
1433 #endif
1434
1435 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1436         .vidioc_querycap = uvc_ioctl_querycap,
1437         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1438         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1439         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1440         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1441         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1442         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1443         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1444         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1445         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1446         .vidioc_querybuf = uvc_ioctl_querybuf,
1447         .vidioc_qbuf = uvc_ioctl_qbuf,
1448         .vidioc_expbuf = uvc_ioctl_expbuf,
1449         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1450         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1451         .vidioc_streamon = uvc_ioctl_streamon,
1452         .vidioc_streamoff = uvc_ioctl_streamoff,
1453         .vidioc_enum_input = uvc_ioctl_enum_input,
1454         .vidioc_g_input = uvc_ioctl_g_input,
1455         .vidioc_s_input = uvc_ioctl_s_input,
1456         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1457         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1458         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1459         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1460         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1461         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1462         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1463         .vidioc_querymenu = uvc_ioctl_querymenu,
1464         .vidioc_g_selection = uvc_ioctl_g_selection,
1465         .vidioc_g_parm = uvc_ioctl_g_parm,
1466         .vidioc_s_parm = uvc_ioctl_s_parm,
1467         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1468         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1469         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1470         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1471         .vidioc_default = uvc_ioctl_default,
1472 };
1473
1474 const struct v4l2_file_operations uvc_fops = {
1475         .owner          = THIS_MODULE,
1476         .open           = uvc_v4l2_open,
1477         .release        = uvc_v4l2_release,
1478         .unlocked_ioctl = video_ioctl2,
1479 #ifdef CONFIG_COMPAT
1480         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1481 #endif
1482         .read           = uvc_v4l2_read,
1483         .mmap           = uvc_v4l2_mmap,
1484         .poll           = uvc_v4l2_poll,
1485 #ifndef CONFIG_MMU
1486         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1487 #endif
1488 };
1489