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