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         /* After the probe, update fmt with the values returned from
 256          * negotiation with the device. Some devices return invalid bFormatIndex
 257          * and bFrameIndex values, in which case we can only assume they have
 258          * accepted the requested format as-is.
 259          */
 260         for (i = 0; i < stream->nformats; ++i) {
 261                 if (probe->bFormatIndex == stream->format[i].index) {
 262                         format = &stream->format[i];
 263                         break;
 264                 }
 265         }
 266
 267         if (i == stream->nformats)
 268                 uvc_trace(UVC_TRACE_FORMAT,
 269                           "Unknown bFormatIndex %u, using default\n",
 270                           probe->bFormatIndex);
 271
 272         for (i = 0; i < format->nframes; ++i) {
 273                 if (probe->bFrameIndex == format->frame[i].bFrameIndex) {
 274                         frame = &format->frame[i];
 275                         break;
 276                 }
 277         }
 278
 279         if (i == format->nframes)
 280                 uvc_trace(UVC_TRACE_FORMAT,
 281                           "Unknown bFrameIndex %u, using default\n",
 282                           probe->bFrameIndex);
 283
 284         fmt->fmt.pix.width = frame->wWidth;
 285         fmt->fmt.pix.height = frame->wHeight;
 286         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 287         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 288         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 289         fmt->fmt.pix.pixelformat = format->fcc;
 290         fmt->fmt.pix.colorspace = format->colorspace;
 291         fmt->fmt.pix.priv = 0;
 292
 293         if (uvc_format != NULL)
 294                 *uvc_format = format;
 295         if (uvc_frame != NULL)
 296                 *uvc_frame = frame;
 297
 298 done:
 299         return ret;
 300 }
 301
 302 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 303         struct v4l2_format *fmt)
 304 {
 305         struct uvc_format *format;
 306         struct uvc_frame *frame;
 307         int ret = 0;
 308
 309         if (fmt->type != stream->type)
 310                 return -EINVAL;
 311
 312         mutex_lock(&stream->mutex);
 313         format = stream->cur_format;
 314         frame = stream->cur_frame;
 315
 316         if (format == NULL || frame == NULL) {
 317                 ret = -EINVAL;
 318                 goto done;
 319         }
 320
 321         fmt->fmt.pix.pixelformat = format->fcc;
 322         fmt->fmt.pix.width = frame->wWidth;
 323         fmt->fmt.pix.height = frame->wHeight;
 324         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 325         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 326         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 327         fmt->fmt.pix.colorspace = format->colorspace;
 328         fmt->fmt.pix.priv = 0;
 329
 330 done:
 331         mutex_unlock(&stream->mutex);
 332         return ret;
 333 }
 334
 335 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 336         struct v4l2_format *fmt)
 337 {
 338         struct uvc_streaming_control probe;
 339         struct uvc_format *format;
 340         struct uvc_frame *frame;
 341         int ret;
 342
 343         if (fmt->type != stream->type)
 344                 return -EINVAL;
 345
 346         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 347         if (ret < 0)
 348                 return ret;
 349
 350         mutex_lock(&stream->mutex);
 351
 352         if (uvc_queue_allocated(&stream->queue)) {
 353                 ret = -EBUSY;
 354                 goto done;
 355         }
 356
 357         stream->ctrl = probe;
 358         stream->cur_format = format;
 359         stream->cur_frame = frame;
 360
 361 done:
 362         mutex_unlock(&stream->mutex);
 363         return ret;
 364 }
 365
 366 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 367                 struct v4l2_streamparm *parm)
 368 {
 369         u32 numerator, denominator;
 370
 371         if (parm->type != stream->type)
 372                 return -EINVAL;
 373
 374         mutex_lock(&stream->mutex);
 375         numerator = stream->ctrl.dwFrameInterval;
 376         mutex_unlock(&stream->mutex);
 377
 378         denominator = 10000000;
 379         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 380
 381         memset(parm, 0, sizeof(*parm));
 382         parm->type = stream->type;
 383
 384         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 385                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 386                 parm->parm.capture.capturemode = 0;
 387                 parm->parm.capture.timeperframe.numerator = numerator;
 388                 parm->parm.capture.timeperframe.denominator = denominator;
 389                 parm->parm.capture.extendedmode = 0;
 390                 parm->parm.capture.readbuffers = 0;
 391         } else {
 392                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 393                 parm->parm.output.outputmode = 0;
 394                 parm->parm.output.timeperframe.numerator = numerator;
 395                 parm->parm.output.timeperframe.denominator = denominator;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 402                 struct v4l2_streamparm *parm)
 403 {
 404         struct uvc_streaming_control probe;
 405         struct v4l2_fract timeperframe;
 406         struct uvc_format *format;
 407         struct uvc_frame *frame;
 408         u32 interval, maxd;
 409         unsigned int i;
 410         int ret;
 411
 412         if (parm->type != stream->type)
 413                 return -EINVAL;
 414
 415         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 416                 timeperframe = parm->parm.capture.timeperframe;
 417         else
 418                 timeperframe = parm->parm.output.timeperframe;
 419
 420         interval = uvc_fraction_to_interval(timeperframe.numerator,
 421                 timeperframe.denominator);
 422         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 423                 timeperframe.numerator, timeperframe.denominator, interval);
 424
 425         mutex_lock(&stream->mutex);
 426
 427         if (uvc_queue_streaming(&stream->queue)) {
 428                 mutex_unlock(&stream->mutex);
 429                 return -EBUSY;
 430         }
 431
 432         format = stream->cur_format;
 433         frame = stream->cur_frame;
 434         probe = stream->ctrl;
 435         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 436         maxd = abs((s32)probe.dwFrameInterval - interval);
 437
 438         /* Try frames with matching size to find the best frame interval. */
 439         for (i = 0; i < format->nframes && maxd != 0; i++) {
 440                 u32 d, ival;
 441
 442                 if (&format->frame[i] == stream->cur_frame)
 443                         continue;
 444
 445                 if (format->frame[i].wWidth != stream->cur_frame->wWidth ||
 446                     format->frame[i].wHeight != stream->cur_frame->wHeight)
 447                         continue;
 448
 449                 ival = uvc_try_frame_interval(&format->frame[i], interval);
 450                 d = abs((s32)ival - interval);
 451                 if (d >= maxd)
 452                         continue;
 453
 454                 frame = &format->frame[i];
 455                 probe.bFrameIndex = frame->bFrameIndex;
 456                 probe.dwFrameInterval = ival;
 457                 maxd = d;
 458         }
 459
 460         /* Probe the device with the new settings. */
 461         ret = uvc_probe_video(stream, &probe);
 462         if (ret < 0) {
 463                 mutex_unlock(&stream->mutex);
 464                 return ret;
 465         }
 466
 467         stream->ctrl = probe;
 468         stream->cur_frame = frame;
 469         mutex_unlock(&stream->mutex);
 470
 471         /* Return the actual frame period. */
 472         timeperframe.numerator = probe.dwFrameInterval;
 473         timeperframe.denominator = 10000000;
 474         uvc_simplify_fraction(&timeperframe.numerator,
 475                 &timeperframe.denominator, 8, 333);
 476
 477         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 478                 parm->parm.capture.timeperframe = timeperframe;
 479                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 480         } else {
 481                 parm->parm.output.timeperframe = timeperframe;
 482                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 483         }
 484
 485         return 0;
 486 }
 487
 488 /* ------------------------------------------------------------------------
 489  * Privilege management
 490  */
 491
 492 /*
 493  * Privilege management is the multiple-open implementation basis. The current
 494  * implementation is completely transparent for the end-user and doesn't
 495  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 496  * Those ioctls enable finer control on the device (by making possible for a
 497  * user to request exclusive access to a device), but are not mature yet.
 498  * Switching to the V4L2 priority mechanism might be considered in the future
 499  * if this situation changes.
 500  *
 501  * Each open instance of a UVC device can either be in a privileged or
 502  * unprivileged state. Only a single instance can be in a privileged state at
 503  * a given time. Trying to perform an operation that requires privileges will
 504  * automatically acquire the required privileges if possible, or return -EBUSY
 505  * otherwise. Privileges are dismissed when closing the instance or when
 506  * freeing the video buffers using VIDIOC_REQBUFS.
 507  *
 508  * Operations that require privileges are:
 509  *
 510  * - VIDIOC_S_INPUT
 511  * - VIDIOC_S_PARM
 512  * - VIDIOC_S_FMT
 513  * - VIDIOC_REQBUFS
 514  */
 515 static int uvc_acquire_privileges(struct uvc_fh *handle)
 516 {
 517         /* Always succeed if the handle is already privileged. */
 518         if (handle->state == UVC_HANDLE_ACTIVE)
 519                 return 0;
 520
 521         /* Check if the device already has a privileged handle. */
 522         if (atomic_inc_return(&handle->stream->active) != 1) {
 523                 atomic_dec(&handle->stream->active);
 524                 return -EBUSY;
 525         }
 526
 527         handle->state = UVC_HANDLE_ACTIVE;
 528         return 0;
 529 }
 530
 531 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 532 {
 533         if (handle->state == UVC_HANDLE_ACTIVE)
 534                 atomic_dec(&handle->stream->active);
 535
 536         handle->state = UVC_HANDLE_PASSIVE;
 537 }
 538
 539 static int uvc_has_privileges(struct uvc_fh *handle)
 540 {
 541         return handle->state == UVC_HANDLE_ACTIVE;
 542 }
 543
 544 /* ------------------------------------------------------------------------
 545  * V4L2 file operations
 546  */
 547
 548 static int uvc_v4l2_open(struct file *file)
 549 {
 550         struct uvc_streaming *stream;
 551         struct uvc_fh *handle;
 552         int ret = 0;
 553
 554         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 555         stream = video_drvdata(file);
 556
 557         ret = usb_autopm_get_interface(stream->dev->intf);
 558         if (ret < 0)
 559                 return ret;
 560
 561         /* Create the device handle. */
 562         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 563         if (handle == NULL) {
 564                 usb_autopm_put_interface(stream->dev->intf);
 565                 return -ENOMEM;
 566         }
 567
 568         mutex_lock(&stream->dev->lock);
 569         if (stream->dev->users == 0) {
 570                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 571                 if (ret < 0) {
 572                         mutex_unlock(&stream->dev->lock);
 573                         usb_autopm_put_interface(stream->dev->intf);
 574                         kfree(handle);
 575                         return ret;
 576                 }
 577         }
 578
 579         stream->dev->users++;
 580         mutex_unlock(&stream->dev->lock);
 581
 582         v4l2_fh_init(&handle->vfh, &stream->vdev);
 583         v4l2_fh_add(&handle->vfh);
 584         handle->chain = stream->chain;
 585         handle->stream = stream;
 586         handle->state = UVC_HANDLE_PASSIVE;
 587         file->private_data = handle;
 588
 589         return 0;
 590 }
 591
 592 static int uvc_v4l2_release(struct file *file)
 593 {
 594         struct uvc_fh *handle = file->private_data;
 595         struct uvc_streaming *stream = handle->stream;
 596
 597         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 598
 599         /* Only free resources if this is a privileged handle. */
 600         if (uvc_has_privileges(handle))
 601                 uvc_queue_release(&stream->queue);
 602
 603         /* Release the file handle. */
 604         uvc_dismiss_privileges(handle);
 605         v4l2_fh_del(&handle->vfh);
 606         v4l2_fh_exit(&handle->vfh);
 607         kfree(handle);
 608         file->private_data = NULL;
 609
 610         mutex_lock(&stream->dev->lock);
 611         if (--stream->dev->users == 0)
 612                 uvc_status_stop(stream->dev);
 613         mutex_unlock(&stream->dev->lock);
 614
 615         usb_autopm_put_interface(stream->dev->intf);
 616         return 0;
 617 }
 618
 619 static int uvc_ioctl_querycap(struct file *file, void *fh,
 620                               struct v4l2_capability *cap)
 621 {
 622         struct video_device *vdev = video_devdata(file);
 623         struct uvc_fh *handle = file->private_data;
 624         struct uvc_video_chain *chain = handle->chain;
 625         struct uvc_streaming *stream = handle->stream;
 626
 627         strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 628         strlcpy(cap->card, vdev->name, sizeof(cap->card));
 629         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 630         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 631                           | chain->caps;
 632
 633         return 0;
 634 }
 635
 636 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 637                               struct v4l2_fmtdesc *fmt)
 638 {
 639         struct uvc_format *format;
 640         enum v4l2_buf_type type = fmt->type;
 641         u32 index = fmt->index;
 642
 643         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 644                 return -EINVAL;
 645
 646         memset(fmt, 0, sizeof(*fmt));
 647         fmt->index = index;
 648         fmt->type = type;
 649
 650         format = &stream->format[fmt->index];
 651         fmt->flags = 0;
 652         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 653                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 654         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 655         fmt->description[sizeof(fmt->description) - 1] = 0;
 656         fmt->pixelformat = format->fcc;
 657         return 0;
 658 }
 659
 660 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 661                                       struct v4l2_fmtdesc *fmt)
 662 {
 663         struct uvc_fh *handle = fh;
 664         struct uvc_streaming *stream = handle->stream;
 665
 666         return uvc_ioctl_enum_fmt(stream, fmt);
 667 }
 668
 669 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 670                                       struct v4l2_fmtdesc *fmt)
 671 {
 672         struct uvc_fh *handle = fh;
 673         struct uvc_streaming *stream = handle->stream;
 674
 675         return uvc_ioctl_enum_fmt(stream, fmt);
 676 }
 677
 678 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 679                                    struct v4l2_format *fmt)
 680 {
 681         struct uvc_fh *handle = fh;
 682         struct uvc_streaming *stream = handle->stream;
 683
 684         return uvc_v4l2_get_format(stream, fmt);
 685 }
 686
 687 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 688                                    struct v4l2_format *fmt)
 689 {
 690         struct uvc_fh *handle = fh;
 691         struct uvc_streaming *stream = handle->stream;
 692
 693         return uvc_v4l2_get_format(stream, fmt);
 694 }
 695
 696 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 697                                    struct v4l2_format *fmt)
 698 {
 699         struct uvc_fh *handle = fh;
 700         struct uvc_streaming *stream = handle->stream;
 701         int ret;
 702
 703         ret = uvc_acquire_privileges(handle);
 704         if (ret < 0)
 705                 return ret;
 706
 707         return uvc_v4l2_set_format(stream, fmt);
 708 }
 709
 710 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 711                                    struct v4l2_format *fmt)
 712 {
 713         struct uvc_fh *handle = fh;
 714         struct uvc_streaming *stream = handle->stream;
 715         int ret;
 716
 717         ret = uvc_acquire_privileges(handle);
 718         if (ret < 0)
 719                 return ret;
 720
 721         return uvc_v4l2_set_format(stream, fmt);
 722 }
 723
 724 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 725                                      struct v4l2_format *fmt)
 726 {
 727         struct uvc_fh *handle = fh;
 728         struct uvc_streaming *stream = handle->stream;
 729         struct uvc_streaming_control probe;
 730
 731         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 732 }
 733
 734 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 735                                      struct v4l2_format *fmt)
 736 {
 737         struct uvc_fh *handle = fh;
 738         struct uvc_streaming *stream = handle->stream;
 739         struct uvc_streaming_control probe;
 740
 741         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 742 }
 743
 744 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 745                              struct v4l2_requestbuffers *rb)
 746 {
 747         struct uvc_fh *handle = fh;
 748         struct uvc_streaming *stream = handle->stream;
 749         int ret;
 750
 751         ret = uvc_acquire_privileges(handle);
 752         if (ret < 0)
 753                 return ret;
 754
 755         mutex_lock(&stream->mutex);
 756         ret = uvc_request_buffers(&stream->queue, rb);
 757         mutex_unlock(&stream->mutex);
 758         if (ret < 0)
 759                 return ret;
 760
 761         if (ret == 0)
 762                 uvc_dismiss_privileges(handle);
 763
 764         return 0;
 765 }
 766
 767 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 768                               struct v4l2_buffer *buf)
 769 {
 770         struct uvc_fh *handle = fh;
 771         struct uvc_streaming *stream = handle->stream;
 772
 773         if (!uvc_has_privileges(handle))
 774                 return -EBUSY;
 775
 776         return uvc_query_buffer(&stream->queue, buf);
 777 }
 778
 779 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 780 {
 781         struct uvc_fh *handle = fh;
 782         struct uvc_streaming *stream = handle->stream;
 783
 784         if (!uvc_has_privileges(handle))
 785                 return -EBUSY;
 786
 787         return uvc_queue_buffer(&stream->queue, buf);
 788 }
 789
 790 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 791                             struct v4l2_exportbuffer *exp)
 792 {
 793         struct uvc_fh *handle = fh;
 794         struct uvc_streaming *stream = handle->stream;
 795
 796         if (!uvc_has_privileges(handle))
 797                 return -EBUSY;
 798
 799         return uvc_export_buffer(&stream->queue, exp);
 800 }
 801
 802 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 803 {
 804         struct uvc_fh *handle = fh;
 805         struct uvc_streaming *stream = handle->stream;
 806
 807         if (!uvc_has_privileges(handle))
 808                 return -EBUSY;
 809
 810         return uvc_dequeue_buffer(&stream->queue, buf,
 811                                   file->f_flags & O_NONBLOCK);
 812 }
 813
 814 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 815                                   struct v4l2_create_buffers *cb)
 816 {
 817         struct uvc_fh *handle = fh;
 818         struct uvc_streaming *stream = handle->stream;
 819         int ret;
 820
 821         ret = uvc_acquire_privileges(handle);
 822         if (ret < 0)
 823                 return ret;
 824
 825         return uvc_create_buffers(&stream->queue, cb);
 826 }
 827
 828 static int uvc_ioctl_streamon(struct file *file, void *fh,
 829                               enum v4l2_buf_type type)
 830 {
 831         struct uvc_fh *handle = fh;
 832         struct uvc_streaming *stream = handle->stream;
 833         int ret;
 834
 835         if (!uvc_has_privileges(handle))
 836                 return -EBUSY;
 837
 838         mutex_lock(&stream->mutex);
 839         ret = uvc_queue_streamon(&stream->queue, type);
 840         mutex_unlock(&stream->mutex);
 841
 842         return ret;
 843 }
 844
 845 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 846                                enum v4l2_buf_type type)
 847 {
 848         struct uvc_fh *handle = fh;
 849         struct uvc_streaming *stream = handle->stream;
 850
 851         if (!uvc_has_privileges(handle))
 852                 return -EBUSY;
 853
 854         mutex_lock(&stream->mutex);
 855         uvc_queue_streamoff(&stream->queue, type);
 856         mutex_unlock(&stream->mutex);
 857
 858         return 0;
 859 }
 860
 861 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 862                                 struct v4l2_input *input)
 863 {
 864         struct uvc_fh *handle = fh;
 865         struct uvc_video_chain *chain = handle->chain;
 866         const struct uvc_entity *selector = chain->selector;
 867         struct uvc_entity *iterm = NULL;
 868         struct uvc_entity *it;
 869         u32 index = input->index;
 870
 871         if (selector == NULL ||
 872             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 873                 if (index != 0)
 874                         return -EINVAL;
 875                 list_for_each_entry(it, &chain->entities, chain) {
 876                         if (UVC_ENTITY_IS_ITERM(it)) {
 877                                 iterm = it;
 878                                 break;
 879                         }
 880                 }
 881         } else if (index < selector->bNrInPins) {
 882                 list_for_each_entry(it, &chain->entities, chain) {
 883                         if (!UVC_ENTITY_IS_ITERM(it))
 884                                 continue;
 885                         if (it->id == selector->baSourceID[index]) {
 886                                 iterm = it;
 887                                 break;
 888                         }
 889                 }
 890         }
 891
 892         if (iterm == NULL)
 893                 return -EINVAL;
 894
 895         memset(input, 0, sizeof(*input));
 896         input->index = index;
 897         strlcpy(input->name, iterm->name, sizeof(input->name));
 898         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 899                 input->type = V4L2_INPUT_TYPE_CAMERA;
 900
 901         return 0;
 902 }
 903
 904 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 905 {
 906         struct uvc_fh *handle = fh;
 907         struct uvc_video_chain *chain = handle->chain;
 908         u8 *buf;
 909         int ret;
 910
 911         if (chain->selector == NULL ||
 912             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 913                 *input = 0;
 914                 return 0;
 915         }
 916
 917         buf = kmalloc(1, GFP_KERNEL);
 918         if (!buf)
 919                 return -ENOMEM;
 920
 921         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 922                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 923                              buf, 1);
 924         if (!ret)
 925                 *input = *buf - 1;
 926
 927         kfree(buf);
 928
 929         return ret;
 930 }
 931
 932 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 933 {
 934         struct uvc_fh *handle = fh;
 935         struct uvc_video_chain *chain = handle->chain;
 936         u8 *buf;
 937         int ret;
 938
 939         ret = uvc_acquire_privileges(handle);
 940         if (ret < 0)
 941                 return ret;
 942
 943         if (chain->selector == NULL ||
 944             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 945                 if (input)
 946                         return -EINVAL;
 947                 return 0;
 948         }
 949
 950         if (input >= chain->selector->bNrInPins)
 951                 return -EINVAL;
 952
 953         buf = kmalloc(1, GFP_KERNEL);
 954         if (!buf)
 955                 return -ENOMEM;
 956
 957         *buf = input + 1;
 958         ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 959                              chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 960                              buf, 1);
 961         kfree(buf);
 962
 963         return ret;
 964 }
 965
 966 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 967                                struct v4l2_queryctrl *qc)
 968 {
 969         struct uvc_fh *handle = fh;
 970         struct uvc_video_chain *chain = handle->chain;
 971
 972         return uvc_query_v4l2_ctrl(chain, qc);
 973 }
 974
 975 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 976                                     struct v4l2_query_ext_ctrl *qec)
 977 {
 978         struct uvc_fh *handle = fh;
 979         struct uvc_video_chain *chain = handle->chain;
 980         struct v4l2_queryctrl qc = { qec->id };
 981         int ret;
 982
 983         ret = uvc_query_v4l2_ctrl(chain, &qc);
 984         if (ret)
 985                 return ret;
 986
 987         qec->id = qc.id;
 988         qec->type = qc.type;
 989         strlcpy(qec->name, qc.name, sizeof(qec->name));
 990         qec->minimum = qc.minimum;
 991         qec->maximum = qc.maximum;
 992         qec->step = qc.step;
 993         qec->default_value = qc.default_value;
 994         qec->flags = qc.flags;
 995         qec->elem_size = 4;
 996         qec->elems = 1;
 997         qec->nr_of_dims = 0;
 998         memset(qec->dims, 0, sizeof(qec->dims));
 999         memset(qec->reserved, 0, sizeof(qec->reserved));
1000
1001         return 0;
1002 }
1003
1004 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
1005                             struct v4l2_control *ctrl)
1006 {
1007         struct uvc_fh *handle = fh;
1008         struct uvc_video_chain *chain = handle->chain;
1009         struct v4l2_ext_control xctrl;
1010         int ret;
1011
1012         memset(&xctrl, 0, sizeof(xctrl));
1013         xctrl.id = ctrl->id;
1014
1015         ret = uvc_ctrl_begin(chain);
1016         if (ret < 0)
1017                 return ret;
1018
1019         ret = uvc_ctrl_get(chain, &xctrl);
1020         uvc_ctrl_rollback(handle);
1021         if (ret < 0)
1022                 return ret;
1023
1024         ctrl->value = xctrl.value;
1025         return 0;
1026 }
1027
1028 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
1029                             struct v4l2_control *ctrl)
1030 {
1031         struct uvc_fh *handle = fh;
1032         struct uvc_video_chain *chain = handle->chain;
1033         struct v4l2_ext_control xctrl;
1034         int ret;
1035
1036         memset(&xctrl, 0, sizeof(xctrl));
1037         xctrl.id = ctrl->id;
1038         xctrl.value = ctrl->value;
1039
1040         ret = uvc_ctrl_begin(chain);
1041         if (ret < 0)
1042                 return ret;
1043
1044         ret = uvc_ctrl_set(handle, &xctrl);
1045         if (ret < 0) {
1046                 uvc_ctrl_rollback(handle);
1047                 return ret;
1048         }
1049
1050         ret = uvc_ctrl_commit(handle, &xctrl, 1);
1051         if (ret < 0)
1052                 return ret;
1053
1054         ctrl->value = xctrl.value;
1055         return 0;
1056 }
1057
1058 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
1059                                  struct v4l2_ext_controls *ctrls)
1060 {
1061         struct uvc_fh *handle = fh;
1062         struct uvc_video_chain *chain = handle->chain;
1063         struct v4l2_ext_control *ctrl = ctrls->controls;
1064         unsigned int i;
1065         int ret;
1066
1067         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1068                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1069                         struct v4l2_queryctrl qc = { .id = ctrl->id };
1070
1071                         ret = uvc_query_v4l2_ctrl(chain, &qc);
1072                         if (ret < 0) {
1073                                 ctrls->error_idx = i;
1074                                 return ret;
1075                         }
1076
1077                         ctrl->value = qc.default_value;
1078                 }
1079
1080                 return 0;
1081         }
1082
1083         ret = uvc_ctrl_begin(chain);
1084         if (ret < 0)
1085                 return ret;
1086
1087         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1088                 ret = uvc_ctrl_get(chain, ctrl);
1089                 if (ret < 0) {
1090                         uvc_ctrl_rollback(handle);
1091                         ctrls->error_idx = i;
1092                         return ret;
1093                 }
1094         }
1095
1096         ctrls->error_idx = 0;
1097
1098         return uvc_ctrl_rollback(handle);
1099 }
1100
1101 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1102                                      struct v4l2_ext_controls *ctrls,
1103                                      bool commit)
1104 {
1105         struct v4l2_ext_control *ctrl = ctrls->controls;
1106         struct uvc_video_chain *chain = handle->chain;
1107         unsigned int i;
1108         int ret;
1109
1110         /* Default value cannot be changed */
1111         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1112                 return -EINVAL;
1113
1114         ret = uvc_ctrl_begin(chain);
1115         if (ret < 0)
1116                 return ret;
1117
1118         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1119                 ret = uvc_ctrl_set(handle, ctrl);
1120                 if (ret < 0) {
1121                         uvc_ctrl_rollback(handle);
1122                         ctrls->error_idx = commit ? ctrls->count : i;
1123                         return ret;
1124                 }
1125         }
1126
1127         ctrls->error_idx = 0;
1128
1129         if (commit)
1130                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1131         else
1132                 return uvc_ctrl_rollback(handle);
1133 }
1134
1135 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1136                                  struct v4l2_ext_controls *ctrls)
1137 {
1138         struct uvc_fh *handle = fh;
1139
1140         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1141 }
1142
1143 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1144                                    struct v4l2_ext_controls *ctrls)
1145 {
1146         struct uvc_fh *handle = fh;
1147
1148         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1149 }
1150
1151 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1152                                struct v4l2_querymenu *qm)
1153 {
1154         struct uvc_fh *handle = fh;
1155         struct uvc_video_chain *chain = handle->chain;
1156
1157         return uvc_query_v4l2_menu(chain, qm);
1158 }
1159
1160 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1161                                  struct v4l2_selection *sel)
1162 {
1163         struct uvc_fh *handle = fh;
1164         struct uvc_streaming *stream = handle->stream;
1165
1166         if (sel->type != stream->type)
1167                 return -EINVAL;
1168
1169         switch (sel->target) {
1170         case V4L2_SEL_TGT_CROP_DEFAULT:
1171         case V4L2_SEL_TGT_CROP_BOUNDS:
1172                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1173                         return -EINVAL;
1174                 break;
1175         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1176         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1177                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1178                         return -EINVAL;
1179                 break;
1180         default:
1181                 return -EINVAL;
1182         }
1183
1184         sel->r.left = 0;
1185         sel->r.top = 0;
1186         mutex_lock(&stream->mutex);
1187         sel->r.width = stream->cur_frame->wWidth;
1188         sel->r.height = stream->cur_frame->wHeight;
1189         mutex_unlock(&stream->mutex);
1190
1191         return 0;
1192 }
1193
1194 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1195                             struct v4l2_streamparm *parm)
1196 {
1197         struct uvc_fh *handle = fh;
1198         struct uvc_streaming *stream = handle->stream;
1199
1200         return uvc_v4l2_get_streamparm(stream, parm);
1201 }
1202
1203 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1204                             struct v4l2_streamparm *parm)
1205 {
1206         struct uvc_fh *handle = fh;
1207         struct uvc_streaming *stream = handle->stream;
1208         int ret;
1209
1210         ret = uvc_acquire_privileges(handle);
1211         if (ret < 0)
1212                 return ret;
1213
1214         return uvc_v4l2_set_streamparm(stream, parm);
1215 }
1216
1217 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1218                                      struct v4l2_frmsizeenum *fsize)
1219 {
1220         struct uvc_fh *handle = fh;
1221         struct uvc_streaming *stream = handle->stream;
1222         struct uvc_format *format = NULL;
1223         struct uvc_frame *frame = NULL;
1224         unsigned int index;
1225         unsigned int i;
1226
1227         /* Look for the given pixel format */
1228         for (i = 0; i < stream->nformats; i++) {
1229                 if (stream->format[i].fcc == fsize->pixel_format) {
1230                         format = &stream->format[i];
1231                         break;
1232                 }
1233         }
1234         if (format == NULL)
1235                 return -EINVAL;
1236
1237         /* Skip duplicate frame sizes */
1238         for (i = 0, index = 0; i < format->nframes; i++) {
1239                 if (frame && frame->wWidth == format->frame[i].wWidth &&
1240                     frame->wHeight == format->frame[i].wHeight)
1241                         continue;
1242                 frame = &format->frame[i];
1243                 if (index == fsize->index)
1244                         break;
1245                 index++;
1246         }
1247
1248         if (i == format->nframes)
1249                 return -EINVAL;
1250
1251         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1252         fsize->discrete.width = frame->wWidth;
1253         fsize->discrete.height = frame->wHeight;
1254         return 0;
1255 }
1256
1257 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1258                                          struct v4l2_frmivalenum *fival)
1259 {
1260         struct uvc_fh *handle = fh;
1261         struct uvc_streaming *stream = handle->stream;
1262         struct uvc_format *format = NULL;
1263         struct uvc_frame *frame = NULL;
1264         unsigned int nintervals;
1265         unsigned int index;
1266         unsigned int i;
1267
1268         /* Look for the given pixel format and frame size */
1269         for (i = 0; i < stream->nformats; i++) {
1270                 if (stream->format[i].fcc == fival->pixel_format) {
1271                         format = &stream->format[i];
1272                         break;
1273                 }
1274         }
1275         if (format == NULL)
1276                 return -EINVAL;
1277
1278         index = fival->index;
1279         for (i = 0; i < format->nframes; i++) {
1280                 if (format->frame[i].wWidth == fival->width &&
1281                     format->frame[i].wHeight == fival->height) {
1282                         frame = &format->frame[i];
1283                         nintervals = frame->bFrameIntervalType ?: 1;
1284                         if (index < nintervals)
1285                                 break;
1286                         index -= nintervals;
1287                 }
1288         }
1289         if (i == format->nframes)
1290                 return -EINVAL;
1291
1292         if (frame->bFrameIntervalType) {
1293                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1294                 fival->discrete.numerator =
1295                         frame->dwFrameInterval[index];
1296                 fival->discrete.denominator = 10000000;
1297                 uvc_simplify_fraction(&fival->discrete.numerator,
1298                         &fival->discrete.denominator, 8, 333);
1299         } else {
1300                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1301                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1302                 fival->stepwise.min.denominator = 10000000;
1303                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1304                 fival->stepwise.max.denominator = 10000000;
1305                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1306                 fival->stepwise.step.denominator = 10000000;
1307                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1308                         &fival->stepwise.min.denominator, 8, 333);
1309                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1310                         &fival->stepwise.max.denominator, 8, 333);
1311                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1312                         &fival->stepwise.step.denominator, 8, 333);
1313         }
1314
1315         return 0;
1316 }
1317
1318 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1319                                      const struct v4l2_event_subscription *sub)
1320 {
1321         switch (sub->type) {
1322         case V4L2_EVENT_CTRL:
1323                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1324         default:
1325                 return -EINVAL;
1326         }
1327 }
1328
1329 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1330                               unsigned int cmd, void *arg)
1331 {
1332         struct uvc_fh *handle = fh;
1333         struct uvc_video_chain *chain = handle->chain;
1334
1335         switch (cmd) {
1336         /* Dynamic controls. */
1337         case UVCIOC_CTRL_MAP:
1338                 return uvc_ioctl_ctrl_map(chain, arg);
1339
1340         case UVCIOC_CTRL_QUERY:
1341                 return uvc_xu_ctrl_query(chain, arg);
1342
1343         default:
1344                 return -ENOTTY;
1345         }
1346 }
1347
1348 #ifdef CONFIG_COMPAT
1349 struct uvc_xu_control_mapping32 {
1350         u32 id;
1351         u8 name[32];
1352         u8 entity[16];
1353         u8 selector;
1354
1355         u8 size;
1356         u8 offset;
1357         u32 v4l2_type;
1358         u32 data_type;
1359
1360         compat_caddr_t menu_info;
1361         u32 menu_count;
1362
1363         u32 reserved[4];
1364 };
1365
1366 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1367                         const struct uvc_xu_control_mapping32 __user *up)
1368 {
1369         struct uvc_xu_control_mapping32 *p = (void *)kp;
1370         compat_caddr_t info;
1371         u32 count;
1372
1373         if (copy_from_user(p, up, sizeof(*p)))
1374                 return -EFAULT;
1375
1376         count = p->menu_count;
1377         info = p->menu_info;
1378
1379         memset(kp->reserved, 0, sizeof(kp->reserved));
1380         kp->menu_info = count ? compat_ptr(info) : NULL;
1381         kp->menu_count = count;
1382         return 0;
1383 }
1384
1385 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1386                         struct uvc_xu_control_mapping32 __user *up)
1387 {
1388         if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1389             put_user(kp->menu_count, &up->menu_count))
1390                 return -EFAULT;
1391
1392         if (clear_user(up->reserved, sizeof(up->reserved)))
1393                 return -EFAULT;
1394
1395         return 0;
1396 }
1397
1398 struct uvc_xu_control_query32 {
1399         u8 unit;
1400         u8 selector;
1401         u8 query;
1402         u16 size;
1403         compat_caddr_t data;
1404 };
1405
1406 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1407                         const struct uvc_xu_control_query32 __user *up)
1408 {
1409         struct uvc_xu_control_query32 v;
1410
1411         if (copy_from_user(&v, up, sizeof(v)))
1412                 return -EFAULT;
1413
1414         *kp = (struct uvc_xu_control_query){
1415                 .unit = v.unit,
1416                 .selector = v.selector,
1417                 .query = v.query,
1418                 .size = v.size,
1419                 .data = v.size ? compat_ptr(v.data) : NULL
1420         };
1421         return 0;
1422 }
1423
1424 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1425                         struct uvc_xu_control_query32 __user *up)
1426 {
1427         if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
1428                 return -EFAULT;
1429         return 0;
1430 }
1431
1432 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1433 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1434
1435 static long uvc_v4l2_compat_ioctl32(struct file *file,
1436                      unsigned int cmd, unsigned long arg)
1437 {
1438         struct uvc_fh *handle = file->private_data;
1439         union {
1440                 struct uvc_xu_control_mapping xmap;
1441                 struct uvc_xu_control_query xqry;
1442         } karg;
1443         void __user *up = compat_ptr(arg);
1444         long ret;
1445
1446         switch (cmd) {
1447         case UVCIOC_CTRL_MAP32:
1448                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1449                 if (ret)
1450                         return ret;
1451                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1452                 if (ret)
1453                         return ret;
1454                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1455                 if (ret)
1456                         return ret;
1457
1458                 break;
1459
1460         case UVCIOC_CTRL_QUERY32:
1461                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1462                 if (ret)
1463                         return ret;
1464                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1465                 if (ret)
1466                         return ret;
1467                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1468                 if (ret)
1469                         return ret;
1470                 break;
1471
1472         default:
1473                 return -ENOIOCTLCMD;
1474         }
1475
1476         return ret;
1477 }
1478 #endif
1479
1480 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1481                     size_t count, loff_t *ppos)
1482 {
1483         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1484         return -EINVAL;
1485 }
1486
1487 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1488 {
1489         struct uvc_fh *handle = file->private_data;
1490         struct uvc_streaming *stream = handle->stream;
1491
1492         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1493
1494         return uvc_queue_mmap(&stream->queue, vma);
1495 }
1496
1497 static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
1498 {
1499         struct uvc_fh *handle = file->private_data;
1500         struct uvc_streaming *stream = handle->stream;
1501
1502         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1503
1504         return uvc_queue_poll(&stream->queue, file, wait);
1505 }
1506
1507 #ifndef CONFIG_MMU
1508 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1509                 unsigned long addr, unsigned long len, unsigned long pgoff,
1510                 unsigned long flags)
1511 {
1512         struct uvc_fh *handle = file->private_data;
1513         struct uvc_streaming *stream = handle->stream;
1514
1515         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1516
1517         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1518 }
1519 #endif
1520
1521 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1522         .vidioc_querycap = uvc_ioctl_querycap,
1523         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1524         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1525         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1526         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1527         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1528         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1529         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1530         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1531         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1532         .vidioc_querybuf = uvc_ioctl_querybuf,
1533         .vidioc_qbuf = uvc_ioctl_qbuf,
1534         .vidioc_expbuf = uvc_ioctl_expbuf,
1535         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1536         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1537         .vidioc_streamon = uvc_ioctl_streamon,
1538         .vidioc_streamoff = uvc_ioctl_streamoff,
1539         .vidioc_enum_input = uvc_ioctl_enum_input,
1540         .vidioc_g_input = uvc_ioctl_g_input,
1541         .vidioc_s_input = uvc_ioctl_s_input,
1542         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1543         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1544         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1545         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1546         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1547         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1548         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1549         .vidioc_querymenu = uvc_ioctl_querymenu,
1550         .vidioc_g_selection = uvc_ioctl_g_selection,
1551         .vidioc_g_parm = uvc_ioctl_g_parm,
1552         .vidioc_s_parm = uvc_ioctl_s_parm,
1553         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1554         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1555         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1556         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1557         .vidioc_default = uvc_ioctl_default,
1558 };
1559
1560 const struct v4l2_file_operations uvc_fops = {
1561         .owner          = THIS_MODULE,
1562         .open           = uvc_v4l2_open,
1563         .release        = uvc_v4l2_release,
1564         .unlocked_ioctl = video_ioctl2,
1565 #ifdef CONFIG_COMPAT
1566         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1567 #endif
1568         .read           = uvc_v4l2_read,
1569         .mmap           = uvc_v4l2_mmap,
1570         .poll           = uvc_v4l2_poll,
1571 #ifndef CONFIG_MMU
1572         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1573 #endif
1574 };
1575