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         uint32_t 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         uint32_t interval;
 407         int ret;
 408
 409         if (parm->type != stream->type)
 410                 return -EINVAL;
 411
 412         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 413                 timeperframe = parm->parm.capture.timeperframe;
 414         else
 415                 timeperframe = parm->parm.output.timeperframe;
 416
 417         interval = uvc_fraction_to_interval(timeperframe.numerator,
 418                 timeperframe.denominator);
 419         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 420                 timeperframe.numerator, timeperframe.denominator, interval);
 421
 422         mutex_lock(&stream->mutex);
 423
 424         if (uvc_queue_streaming(&stream->queue)) {
 425                 mutex_unlock(&stream->mutex);
 426                 return -EBUSY;
 427         }
 428
 429         probe = stream->ctrl;
 430         probe.dwFrameInterval =
 431                 uvc_try_frame_interval(stream->cur_frame, interval);
 432
 433         /* Probe the device with the new settings. */
 434         ret = uvc_probe_video(stream, &probe);
 435         if (ret < 0) {
 436                 mutex_unlock(&stream->mutex);
 437                 return ret;
 438         }
 439
 440         stream->ctrl = probe;
 441         mutex_unlock(&stream->mutex);
 442
 443         /* Return the actual frame period. */
 444         timeperframe.numerator = probe.dwFrameInterval;
 445         timeperframe.denominator = 10000000;
 446         uvc_simplify_fraction(&timeperframe.numerator,
 447                 &timeperframe.denominator, 8, 333);
 448
 449         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 450                 parm->parm.capture.timeperframe = timeperframe;
 451                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 452         } else {
 453                 parm->parm.output.timeperframe = timeperframe;
 454                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 455         }
 456
 457         return 0;
 458 }
 459
 460 /* ------------------------------------------------------------------------
 461  * Privilege management
 462  */
 463
 464 /*
 465  * Privilege management is the multiple-open implementation basis. The current
 466  * implementation is completely transparent for the end-user and doesn't
 467  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 468  * Those ioctls enable finer control on the device (by making possible for a
 469  * user to request exclusive access to a device), but are not mature yet.
 470  * Switching to the V4L2 priority mechanism might be considered in the future
 471  * if this situation changes.
 472  *
 473  * Each open instance of a UVC device can either be in a privileged or
 474  * unprivileged state. Only a single instance can be in a privileged state at
 475  * a given time. Trying to perform an operation that requires privileges will
 476  * automatically acquire the required privileges if possible, or return -EBUSY
 477  * otherwise. Privileges are dismissed when closing the instance or when
 478  * freeing the video buffers using VIDIOC_REQBUFS.
 479  *
 480  * Operations that require privileges are:
 481  *
 482  * - VIDIOC_S_INPUT
 483  * - VIDIOC_S_PARM
 484  * - VIDIOC_S_FMT
 485  * - VIDIOC_REQBUFS
 486  */
 487 static int uvc_acquire_privileges(struct uvc_fh *handle)
 488 {
 489         /* Always succeed if the handle is already privileged. */
 490         if (handle->state == UVC_HANDLE_ACTIVE)
 491                 return 0;
 492
 493         /* Check if the device already has a privileged handle. */
 494         if (atomic_inc_return(&handle->stream->active) != 1) {
 495                 atomic_dec(&handle->stream->active);
 496                 return -EBUSY;
 497         }
 498
 499         handle->state = UVC_HANDLE_ACTIVE;
 500         return 0;
 501 }
 502
 503 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 504 {
 505         if (handle->state == UVC_HANDLE_ACTIVE)
 506                 atomic_dec(&handle->stream->active);
 507
 508         handle->state = UVC_HANDLE_PASSIVE;
 509 }
 510
 511 static int uvc_has_privileges(struct uvc_fh *handle)
 512 {
 513         return handle->state == UVC_HANDLE_ACTIVE;
 514 }
 515
 516 /* ------------------------------------------------------------------------
 517  * V4L2 file operations
 518  */
 519
 520 static int uvc_v4l2_open(struct file *file)
 521 {
 522         struct uvc_streaming *stream;
 523         struct uvc_fh *handle;
 524         int ret = 0;
 525
 526         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 527         stream = video_drvdata(file);
 528
 529         ret = usb_autopm_get_interface(stream->dev->intf);
 530         if (ret < 0)
 531                 return ret;
 532
 533         /* Create the device handle. */
 534         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 535         if (handle == NULL) {
 536                 usb_autopm_put_interface(stream->dev->intf);
 537                 return -ENOMEM;
 538         }
 539
 540         mutex_lock(&stream->dev->lock);
 541         if (stream->dev->users == 0) {
 542                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 543                 if (ret < 0) {
 544                         mutex_unlock(&stream->dev->lock);
 545                         usb_autopm_put_interface(stream->dev->intf);
 546                         kfree(handle);
 547                         return ret;
 548                 }
 549         }
 550
 551         stream->dev->users++;
 552         mutex_unlock(&stream->dev->lock);
 553
 554         v4l2_fh_init(&handle->vfh, &stream->vdev);
 555         v4l2_fh_add(&handle->vfh);
 556         handle->chain = stream->chain;
 557         handle->stream = stream;
 558         handle->state = UVC_HANDLE_PASSIVE;
 559         file->private_data = handle;
 560
 561         return 0;
 562 }
 563
 564 static int uvc_v4l2_release(struct file *file)
 565 {
 566         struct uvc_fh *handle = file->private_data;
 567         struct uvc_streaming *stream = handle->stream;
 568
 569         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 570
 571         /* Only free resources if this is a privileged handle. */
 572         if (uvc_has_privileges(handle))
 573                 uvc_queue_release(&stream->queue);
 574
 575         /* Release the file handle. */
 576         uvc_dismiss_privileges(handle);
 577         v4l2_fh_del(&handle->vfh);
 578         v4l2_fh_exit(&handle->vfh);
 579         kfree(handle);
 580         file->private_data = NULL;
 581
 582         mutex_lock(&stream->dev->lock);
 583         if (--stream->dev->users == 0)
 584                 uvc_status_stop(stream->dev);
 585         mutex_unlock(&stream->dev->lock);
 586
 587         usb_autopm_put_interface(stream->dev->intf);
 588         return 0;
 589 }
 590
 591 static int uvc_ioctl_querycap(struct file *file, void *fh,
 592                               struct v4l2_capability *cap)
 593 {
 594         struct video_device *vdev = video_devdata(file);
 595         struct uvc_fh *handle = file->private_data;
 596         struct uvc_video_chain *chain = handle->chain;
 597         struct uvc_streaming *stream = handle->stream;
 598
 599         strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 600         strlcpy(cap->card, vdev->name, sizeof(cap->card));
 601         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 602         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 603                           | chain->caps;
 604         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 605                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 606         else
 607                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 608
 609         return 0;
 610 }
 611
 612 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 613                               struct v4l2_fmtdesc *fmt)
 614 {
 615         struct uvc_format *format;
 616         enum v4l2_buf_type type = fmt->type;
 617         __u32 index = fmt->index;
 618
 619         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 620                 return -EINVAL;
 621
 622         memset(fmt, 0, sizeof(*fmt));
 623         fmt->index = index;
 624         fmt->type = type;
 625
 626         format = &stream->format[fmt->index];
 627         fmt->flags = 0;
 628         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 629                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 630         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 631         fmt->description[sizeof(fmt->description) - 1] = 0;
 632         fmt->pixelformat = format->fcc;
 633         return 0;
 634 }
 635
 636 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 637                                       struct v4l2_fmtdesc *fmt)
 638 {
 639         struct uvc_fh *handle = fh;
 640         struct uvc_streaming *stream = handle->stream;
 641
 642         return uvc_ioctl_enum_fmt(stream, fmt);
 643 }
 644
 645 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 646                                       struct v4l2_fmtdesc *fmt)
 647 {
 648         struct uvc_fh *handle = fh;
 649         struct uvc_streaming *stream = handle->stream;
 650
 651         return uvc_ioctl_enum_fmt(stream, fmt);
 652 }
 653
 654 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 655                                    struct v4l2_format *fmt)
 656 {
 657         struct uvc_fh *handle = fh;
 658         struct uvc_streaming *stream = handle->stream;
 659
 660         return uvc_v4l2_get_format(stream, fmt);
 661 }
 662
 663 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 664                                    struct v4l2_format *fmt)
 665 {
 666         struct uvc_fh *handle = fh;
 667         struct uvc_streaming *stream = handle->stream;
 668
 669         return uvc_v4l2_get_format(stream, fmt);
 670 }
 671
 672 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 673                                    struct v4l2_format *fmt)
 674 {
 675         struct uvc_fh *handle = fh;
 676         struct uvc_streaming *stream = handle->stream;
 677         int ret;
 678
 679         ret = uvc_acquire_privileges(handle);
 680         if (ret < 0)
 681                 return ret;
 682
 683         return uvc_v4l2_set_format(stream, fmt);
 684 }
 685
 686 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 687                                    struct v4l2_format *fmt)
 688 {
 689         struct uvc_fh *handle = fh;
 690         struct uvc_streaming *stream = handle->stream;
 691         int ret;
 692
 693         ret = uvc_acquire_privileges(handle);
 694         if (ret < 0)
 695                 return ret;
 696
 697         return uvc_v4l2_set_format(stream, fmt);
 698 }
 699
 700 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 701                                      struct v4l2_format *fmt)
 702 {
 703         struct uvc_fh *handle = fh;
 704         struct uvc_streaming *stream = handle->stream;
 705         struct uvc_streaming_control probe;
 706
 707         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 708 }
 709
 710 static int uvc_ioctl_try_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         struct uvc_streaming_control probe;
 716
 717         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 718 }
 719
 720 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 721                              struct v4l2_requestbuffers *rb)
 722 {
 723         struct uvc_fh *handle = fh;
 724         struct uvc_streaming *stream = handle->stream;
 725         int ret;
 726
 727         ret = uvc_acquire_privileges(handle);
 728         if (ret < 0)
 729                 return ret;
 730
 731         mutex_lock(&stream->mutex);
 732         ret = uvc_request_buffers(&stream->queue, rb);
 733         mutex_unlock(&stream->mutex);
 734         if (ret < 0)
 735                 return ret;
 736
 737         if (ret == 0)
 738                 uvc_dismiss_privileges(handle);
 739
 740         return 0;
 741 }
 742
 743 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 744                               struct v4l2_buffer *buf)
 745 {
 746         struct uvc_fh *handle = fh;
 747         struct uvc_streaming *stream = handle->stream;
 748
 749         if (!uvc_has_privileges(handle))
 750                 return -EBUSY;
 751
 752         return uvc_query_buffer(&stream->queue, buf);
 753 }
 754
 755 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 756 {
 757         struct uvc_fh *handle = fh;
 758         struct uvc_streaming *stream = handle->stream;
 759
 760         if (!uvc_has_privileges(handle))
 761                 return -EBUSY;
 762
 763         return uvc_queue_buffer(&stream->queue, buf);
 764 }
 765
 766 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 767                             struct v4l2_exportbuffer *exp)
 768 {
 769         struct uvc_fh *handle = fh;
 770         struct uvc_streaming *stream = handle->stream;
 771
 772         if (!uvc_has_privileges(handle))
 773                 return -EBUSY;
 774
 775         return uvc_export_buffer(&stream->queue, exp);
 776 }
 777
 778 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 779 {
 780         struct uvc_fh *handle = fh;
 781         struct uvc_streaming *stream = handle->stream;
 782
 783         if (!uvc_has_privileges(handle))
 784                 return -EBUSY;
 785
 786         return uvc_dequeue_buffer(&stream->queue, buf,
 787                                   file->f_flags & O_NONBLOCK);
 788 }
 789
 790 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 791                                   struct v4l2_create_buffers *cb)
 792 {
 793         struct uvc_fh *handle = fh;
 794         struct uvc_streaming *stream = handle->stream;
 795         int ret;
 796
 797         ret = uvc_acquire_privileges(handle);
 798         if (ret < 0)
 799                 return ret;
 800
 801         return uvc_create_buffers(&stream->queue, cb);
 802 }
 803
 804 static int uvc_ioctl_streamon(struct file *file, void *fh,
 805                               enum v4l2_buf_type type)
 806 {
 807         struct uvc_fh *handle = fh;
 808         struct uvc_streaming *stream = handle->stream;
 809         int ret;
 810
 811         if (!uvc_has_privileges(handle))
 812                 return -EBUSY;
 813
 814         mutex_lock(&stream->mutex);
 815         ret = uvc_queue_streamon(&stream->queue, type);
 816         mutex_unlock(&stream->mutex);
 817
 818         return ret;
 819 }
 820
 821 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 822                                enum v4l2_buf_type type)
 823 {
 824         struct uvc_fh *handle = fh;
 825         struct uvc_streaming *stream = handle->stream;
 826
 827         if (!uvc_has_privileges(handle))
 828                 return -EBUSY;
 829
 830         mutex_lock(&stream->mutex);
 831         uvc_queue_streamoff(&stream->queue, type);
 832         mutex_unlock(&stream->mutex);
 833
 834         return 0;
 835 }
 836
 837 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 838                                 struct v4l2_input *input)
 839 {
 840         struct uvc_fh *handle = fh;
 841         struct uvc_video_chain *chain = handle->chain;
 842         const struct uvc_entity *selector = chain->selector;
 843         struct uvc_entity *iterm = NULL;
 844         struct uvc_entity *it;
 845         u32 index = input->index;
 846
 847         if (selector == NULL ||
 848             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 849                 if (index != 0)
 850                         return -EINVAL;
 851                 list_for_each_entry(it, &chain->entities, chain) {
 852                         if (UVC_ENTITY_IS_ITERM(it)) {
 853                                 iterm = it;
 854                                 break;
 855                         }
 856                 }
 857         } else if (index < selector->bNrInPins) {
 858                 list_for_each_entry(it, &chain->entities, chain) {
 859                         if (!UVC_ENTITY_IS_ITERM(it))
 860                                 continue;
 861                         if (it->id == selector->baSourceID[index]) {
 862                                 iterm = it;
 863                                 break;
 864                         }
 865                 }
 866         }
 867
 868         if (iterm == NULL)
 869                 return -EINVAL;
 870
 871         memset(input, 0, sizeof(*input));
 872         input->index = index;
 873         strlcpy(input->name, iterm->name, sizeof(input->name));
 874         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 875                 input->type = V4L2_INPUT_TYPE_CAMERA;
 876
 877         return 0;
 878 }
 879
 880 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 881 {
 882         struct uvc_fh *handle = fh;
 883         struct uvc_video_chain *chain = handle->chain;
 884         u8 *buf;
 885         int ret;
 886
 887         if (chain->selector == NULL ||
 888             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 889                 *input = 0;
 890                 return 0;
 891         }
 892
 893         buf = kmalloc(1, GFP_KERNEL);
 894         if (!buf)
 895                 return -ENOMEM;
 896
 897         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 898                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 899                              buf, 1);
 900         if (!ret)
 901                 *input = *buf - 1;
 902
 903         kfree(buf);
 904
 905         return ret;
 906 }
 907
 908 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 909 {
 910         struct uvc_fh *handle = fh;
 911         struct uvc_video_chain *chain = handle->chain;
 912         u8 *buf;
 913         int ret;
 914
 915         ret = uvc_acquire_privileges(handle);
 916         if (ret < 0)
 917                 return ret;
 918
 919         if (chain->selector == NULL ||
 920             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 921                 if (input)
 922                         return -EINVAL;
 923                 return 0;
 924         }
 925
 926         if (input >= chain->selector->bNrInPins)
 927                 return -EINVAL;
 928
 929         buf = kmalloc(1, GFP_KERNEL);
 930         if (!buf)
 931                 return -ENOMEM;
 932
 933         *buf = input + 1;
 934         ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 935                              chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 936                              buf, 1);
 937         kfree(buf);
 938
 939         return ret;
 940 }
 941
 942 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 943                                struct v4l2_queryctrl *qc)
 944 {
 945         struct uvc_fh *handle = fh;
 946         struct uvc_video_chain *chain = handle->chain;
 947
 948         return uvc_query_v4l2_ctrl(chain, qc);
 949 }
 950
 951 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 952                                     struct v4l2_query_ext_ctrl *qec)
 953 {
 954         struct uvc_fh *handle = fh;
 955         struct uvc_video_chain *chain = handle->chain;
 956         struct v4l2_queryctrl qc = { qec->id };
 957         int ret;
 958
 959         ret = uvc_query_v4l2_ctrl(chain, &qc);
 960         if (ret)
 961                 return ret;
 962
 963         qec->id = qc.id;
 964         qec->type = qc.type;
 965         strlcpy(qec->name, qc.name, sizeof(qec->name));
 966         qec->minimum = qc.minimum;
 967         qec->maximum = qc.maximum;
 968         qec->step = qc.step;
 969         qec->default_value = qc.default_value;
 970         qec->flags = qc.flags;
 971         qec->elem_size = 4;
 972         qec->elems = 1;
 973         qec->nr_of_dims = 0;
 974         memset(qec->dims, 0, sizeof(qec->dims));
 975         memset(qec->reserved, 0, sizeof(qec->reserved));
 976
 977         return 0;
 978 }
 979
 980 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 981                             struct v4l2_control *ctrl)
 982 {
 983         struct uvc_fh *handle = fh;
 984         struct uvc_video_chain *chain = handle->chain;
 985         struct v4l2_ext_control xctrl;
 986         int ret;
 987
 988         memset(&xctrl, 0, sizeof(xctrl));
 989         xctrl.id = ctrl->id;
 990
 991         ret = uvc_ctrl_begin(chain);
 992         if (ret < 0)
 993                 return ret;
 994
 995         ret = uvc_ctrl_get(chain, &xctrl);
 996         uvc_ctrl_rollback(handle);
 997         if (ret < 0)
 998                 return ret;
 999
1000         ctrl->value = xctrl.value;
1001         return 0;
1002 }
1003
1004 static int uvc_ioctl_s_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         xctrl.value = ctrl->value;
1015
1016         ret = uvc_ctrl_begin(chain);
1017         if (ret < 0)
1018                 return ret;
1019
1020         ret = uvc_ctrl_set(chain, &xctrl);
1021         if (ret < 0) {
1022                 uvc_ctrl_rollback(handle);
1023                 return ret;
1024         }
1025
1026         ret = uvc_ctrl_commit(handle, &xctrl, 1);
1027         if (ret < 0)
1028                 return ret;
1029
1030         ctrl->value = xctrl.value;
1031         return 0;
1032 }
1033
1034 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
1035                                  struct v4l2_ext_controls *ctrls)
1036 {
1037         struct uvc_fh *handle = fh;
1038         struct uvc_video_chain *chain = handle->chain;
1039         struct v4l2_ext_control *ctrl = ctrls->controls;
1040         unsigned int i;
1041         int ret;
1042
1043         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1044                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1045                         struct v4l2_queryctrl qc = { .id = ctrl->id };
1046
1047                         ret = uvc_query_v4l2_ctrl(chain, &qc);
1048                         if (ret < 0) {
1049                                 ctrls->error_idx = i;
1050                                 return ret;
1051                         }
1052
1053                         ctrl->value = qc.default_value;
1054                 }
1055
1056                 return 0;
1057         }
1058
1059         ret = uvc_ctrl_begin(chain);
1060         if (ret < 0)
1061                 return ret;
1062
1063         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1064                 ret = uvc_ctrl_get(chain, ctrl);
1065                 if (ret < 0) {
1066                         uvc_ctrl_rollback(handle);
1067                         ctrls->error_idx = i;
1068                         return ret;
1069                 }
1070         }
1071
1072         ctrls->error_idx = 0;
1073
1074         return uvc_ctrl_rollback(handle);
1075 }
1076
1077 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1078                                      struct v4l2_ext_controls *ctrls,
1079                                      bool commit)
1080 {
1081         struct v4l2_ext_control *ctrl = ctrls->controls;
1082         struct uvc_video_chain *chain = handle->chain;
1083         unsigned int i;
1084         int ret;
1085
1086         /* Default value cannot be changed */
1087         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1088                 return -EINVAL;
1089
1090         ret = uvc_ctrl_begin(chain);
1091         if (ret < 0)
1092                 return ret;
1093
1094         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1095                 ret = uvc_ctrl_set(chain, ctrl);
1096                 if (ret < 0) {
1097                         uvc_ctrl_rollback(handle);
1098                         ctrls->error_idx = commit ? ctrls->count : i;
1099                         return ret;
1100                 }
1101         }
1102
1103         ctrls->error_idx = 0;
1104
1105         if (commit)
1106                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1107         else
1108                 return uvc_ctrl_rollback(handle);
1109 }
1110
1111 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1112                                  struct v4l2_ext_controls *ctrls)
1113 {
1114         struct uvc_fh *handle = fh;
1115
1116         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1117 }
1118
1119 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1120                                    struct v4l2_ext_controls *ctrls)
1121 {
1122         struct uvc_fh *handle = fh;
1123
1124         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1125 }
1126
1127 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1128                                struct v4l2_querymenu *qm)
1129 {
1130         struct uvc_fh *handle = fh;
1131         struct uvc_video_chain *chain = handle->chain;
1132
1133         return uvc_query_v4l2_menu(chain, qm);
1134 }
1135
1136 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1137                                  struct v4l2_selection *sel)
1138 {
1139         struct uvc_fh *handle = fh;
1140         struct uvc_streaming *stream = handle->stream;
1141
1142         if (sel->type != stream->type)
1143                 return -EINVAL;
1144
1145         switch (sel->target) {
1146         case V4L2_SEL_TGT_CROP_DEFAULT:
1147         case V4L2_SEL_TGT_CROP_BOUNDS:
1148                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1149                         return -EINVAL;
1150                 break;
1151         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1152         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1153                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1154                         return -EINVAL;
1155                 break;
1156         default:
1157                 return -EINVAL;
1158         }
1159
1160         sel->r.left = 0;
1161         sel->r.top = 0;
1162         mutex_lock(&stream->mutex);
1163         sel->r.width = stream->cur_frame->wWidth;
1164         sel->r.height = stream->cur_frame->wHeight;
1165         mutex_unlock(&stream->mutex);
1166
1167         return 0;
1168 }
1169
1170 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1171                             struct v4l2_streamparm *parm)
1172 {
1173         struct uvc_fh *handle = fh;
1174         struct uvc_streaming *stream = handle->stream;
1175
1176         return uvc_v4l2_get_streamparm(stream, parm);
1177 }
1178
1179 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1180                             struct v4l2_streamparm *parm)
1181 {
1182         struct uvc_fh *handle = fh;
1183         struct uvc_streaming *stream = handle->stream;
1184         int ret;
1185
1186         ret = uvc_acquire_privileges(handle);
1187         if (ret < 0)
1188                 return ret;
1189
1190         return uvc_v4l2_set_streamparm(stream, parm);
1191 }
1192
1193 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1194                                      struct v4l2_frmsizeenum *fsize)
1195 {
1196         struct uvc_fh *handle = fh;
1197         struct uvc_streaming *stream = handle->stream;
1198         struct uvc_format *format = NULL;
1199         struct uvc_frame *frame;
1200         int i;
1201
1202         /* Look for the given pixel format */
1203         for (i = 0; i < stream->nformats; i++) {
1204                 if (stream->format[i].fcc == fsize->pixel_format) {
1205                         format = &stream->format[i];
1206                         break;
1207                 }
1208         }
1209         if (format == NULL)
1210                 return -EINVAL;
1211
1212         if (fsize->index >= format->nframes)
1213                 return -EINVAL;
1214
1215         frame = &format->frame[fsize->index];
1216         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1217         fsize->discrete.width = frame->wWidth;
1218         fsize->discrete.height = frame->wHeight;
1219         return 0;
1220 }
1221
1222 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1223                                          struct v4l2_frmivalenum *fival)
1224 {
1225         struct uvc_fh *handle = fh;
1226         struct uvc_streaming *stream = handle->stream;
1227         struct uvc_format *format = NULL;
1228         struct uvc_frame *frame = NULL;
1229         int i;
1230
1231         /* Look for the given pixel format and frame size */
1232         for (i = 0; i < stream->nformats; i++) {
1233                 if (stream->format[i].fcc == fival->pixel_format) {
1234                         format = &stream->format[i];
1235                         break;
1236                 }
1237         }
1238         if (format == NULL)
1239                 return -EINVAL;
1240
1241         for (i = 0; i < format->nframes; i++) {
1242                 if (format->frame[i].wWidth == fival->width &&
1243                     format->frame[i].wHeight == fival->height) {
1244                         frame = &format->frame[i];
1245                         break;
1246                 }
1247         }
1248         if (frame == NULL)
1249                 return -EINVAL;
1250
1251         if (frame->bFrameIntervalType) {
1252                 if (fival->index >= frame->bFrameIntervalType)
1253                         return -EINVAL;
1254
1255                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1256                 fival->discrete.numerator =
1257                         frame->dwFrameInterval[fival->index];
1258                 fival->discrete.denominator = 10000000;
1259                 uvc_simplify_fraction(&fival->discrete.numerator,
1260                         &fival->discrete.denominator, 8, 333);
1261         } else {
1262                 if (fival->index)
1263                         return -EINVAL;
1264
1265                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1266                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1267                 fival->stepwise.min.denominator = 10000000;
1268                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1269                 fival->stepwise.max.denominator = 10000000;
1270                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1271                 fival->stepwise.step.denominator = 10000000;
1272                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1273                         &fival->stepwise.min.denominator, 8, 333);
1274                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1275                         &fival->stepwise.max.denominator, 8, 333);
1276                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1277                         &fival->stepwise.step.denominator, 8, 333);
1278         }
1279
1280         return 0;
1281 }
1282
1283 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1284                                      const struct v4l2_event_subscription *sub)
1285 {
1286         switch (sub->type) {
1287         case V4L2_EVENT_CTRL:
1288                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1289         default:
1290                 return -EINVAL;
1291         }
1292 }
1293
1294 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1295                               unsigned int cmd, void *arg)
1296 {
1297         struct uvc_fh *handle = fh;
1298         struct uvc_video_chain *chain = handle->chain;
1299
1300         switch (cmd) {
1301         /* Dynamic controls. */
1302         case UVCIOC_CTRL_MAP:
1303                 return uvc_ioctl_ctrl_map(chain, arg);
1304
1305         case UVCIOC_CTRL_QUERY:
1306                 return uvc_xu_ctrl_query(chain, arg);
1307
1308         default:
1309                 return -ENOTTY;
1310         }
1311 }
1312
1313 #ifdef CONFIG_COMPAT
1314 struct uvc_xu_control_mapping32 {
1315         __u32 id;
1316         __u8 name[32];
1317         __u8 entity[16];
1318         __u8 selector;
1319
1320         __u8 size;
1321         __u8 offset;
1322         __u32 v4l2_type;
1323         __u32 data_type;
1324
1325         compat_caddr_t menu_info;
1326         __u32 menu_count;
1327
1328         __u32 reserved[4];
1329 };
1330
1331 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1332                         const struct uvc_xu_control_mapping32 __user *up)
1333 {
1334         compat_caddr_t p;
1335
1336         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1337             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1338             __get_user(kp->menu_count, &up->menu_count))
1339                 return -EFAULT;
1340
1341         memset(kp->reserved, 0, sizeof(kp->reserved));
1342
1343         if (kp->menu_count == 0) {
1344                 kp->menu_info = NULL;
1345                 return 0;
1346         }
1347
1348         if (__get_user(p, &up->menu_info))
1349                 return -EFAULT;
1350         kp->menu_info = compat_ptr(p);
1351
1352         return 0;
1353 }
1354
1355 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1356                         struct uvc_xu_control_mapping32 __user *up)
1357 {
1358         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1359             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1360             __put_user(kp->menu_count, &up->menu_count))
1361                 return -EFAULT;
1362
1363         if (__clear_user(up->reserved, sizeof(up->reserved)))
1364                 return -EFAULT;
1365
1366         return 0;
1367 }
1368
1369 struct uvc_xu_control_query32 {
1370         __u8 unit;
1371         __u8 selector;
1372         __u8 query;
1373         __u16 size;
1374         compat_caddr_t data;
1375 };
1376
1377 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1378                         const struct uvc_xu_control_query32 __user *up)
1379 {
1380         compat_caddr_t p;
1381
1382         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1383             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1384                 return -EFAULT;
1385
1386         if (kp->size == 0) {
1387                 kp->data = NULL;
1388                 return 0;
1389         }
1390
1391         if (__get_user(p, &up->data))
1392                 return -EFAULT;
1393         kp->data = compat_ptr(p);
1394
1395         return 0;
1396 }
1397
1398 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1399                         struct uvc_xu_control_query32 __user *up)
1400 {
1401         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1402             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1403                 return -EFAULT;
1404
1405         return 0;
1406 }
1407
1408 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1409 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1410
1411 static long uvc_v4l2_compat_ioctl32(struct file *file,
1412                      unsigned int cmd, unsigned long arg)
1413 {
1414         struct uvc_fh *handle = file->private_data;
1415         union {
1416                 struct uvc_xu_control_mapping xmap;
1417                 struct uvc_xu_control_query xqry;
1418         } karg;
1419         void __user *up = compat_ptr(arg);
1420         long ret;
1421
1422         switch (cmd) {
1423         case UVCIOC_CTRL_MAP32:
1424                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1425                 if (ret)
1426                         return ret;
1427                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1428                 if (ret)
1429                         return ret;
1430                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1431                 if (ret)
1432                         return ret;
1433
1434                 break;
1435
1436         case UVCIOC_CTRL_QUERY32:
1437                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1438                 if (ret)
1439                         return ret;
1440                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1441                 if (ret)
1442                         return ret;
1443                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1444                 if (ret)
1445                         return ret;
1446                 break;
1447
1448         default:
1449                 return -ENOIOCTLCMD;
1450         }
1451
1452         return ret;
1453 }
1454 #endif
1455
1456 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1457                     size_t count, loff_t *ppos)
1458 {
1459         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1460         return -EINVAL;
1461 }
1462
1463 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1464 {
1465         struct uvc_fh *handle = file->private_data;
1466         struct uvc_streaming *stream = handle->stream;
1467
1468         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1469
1470         return uvc_queue_mmap(&stream->queue, vma);
1471 }
1472
1473 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1474 {
1475         struct uvc_fh *handle = file->private_data;
1476         struct uvc_streaming *stream = handle->stream;
1477
1478         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1479
1480         return uvc_queue_poll(&stream->queue, file, wait);
1481 }
1482
1483 #ifndef CONFIG_MMU
1484 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1485                 unsigned long addr, unsigned long len, unsigned long pgoff,
1486                 unsigned long flags)
1487 {
1488         struct uvc_fh *handle = file->private_data;
1489         struct uvc_streaming *stream = handle->stream;
1490
1491         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1492
1493         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1494 }
1495 #endif
1496
1497 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1498         .vidioc_querycap = uvc_ioctl_querycap,
1499         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1500         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1501         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1502         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1503         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1504         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1505         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1506         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1507         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1508         .vidioc_querybuf = uvc_ioctl_querybuf,
1509         .vidioc_qbuf = uvc_ioctl_qbuf,
1510         .vidioc_expbuf = uvc_ioctl_expbuf,
1511         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1512         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1513         .vidioc_streamon = uvc_ioctl_streamon,
1514         .vidioc_streamoff = uvc_ioctl_streamoff,
1515         .vidioc_enum_input = uvc_ioctl_enum_input,
1516         .vidioc_g_input = uvc_ioctl_g_input,
1517         .vidioc_s_input = uvc_ioctl_s_input,
1518         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1519         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1520         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1521         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1522         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1523         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1524         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1525         .vidioc_querymenu = uvc_ioctl_querymenu,
1526         .vidioc_g_selection = uvc_ioctl_g_selection,
1527         .vidioc_g_parm = uvc_ioctl_g_parm,
1528         .vidioc_s_parm = uvc_ioctl_s_parm,
1529         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1530         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1531         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1532         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1533         .vidioc_default = uvc_ioctl_default,
1534 };
1535
1536 const struct v4l2_file_operations uvc_fops = {
1537         .owner          = THIS_MODULE,
1538         .open           = uvc_v4l2_open,
1539         .release        = uvc_v4l2_release,
1540         .unlocked_ioctl = video_ioctl2,
1541 #ifdef CONFIG_COMPAT
1542         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1543 #endif
1544         .read           = uvc_v4l2_read,
1545         .mmap           = uvc_v4l2_mmap,
1546         .poll           = uvc_v4l2_poll,
1547 #ifndef CONFIG_MMU
1548         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1549 #endif
1550 };
1551