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 __u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
 146         const struct uvc_frame *frame)
 147 {
 148         switch (format->fcc) {
 149         case V4L2_PIX_FMT_NV12:
 150         case V4L2_PIX_FMT_YVU420:
 151         case V4L2_PIX_FMT_YUV420:
 152         case V4L2_PIX_FMT_M420:
 153                 return frame->wWidth;
 154
 155         default:
 156                 return format->bpp * frame->wWidth / 8;
 157         }
 158 }
 159
 160 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 161         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 162         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 163 {
 164         struct uvc_format *format = NULL;
 165         struct uvc_frame *frame = NULL;
 166         __u16 rw, rh;
 167         unsigned int d, maxd;
 168         unsigned int i;
 169         __u32 interval;
 170         int ret = 0;
 171         __u8 *fcc;
 172
 173         if (fmt->type != stream->type)
 174                 return -EINVAL;
 175
 176         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 177         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 178                         fmt->fmt.pix.pixelformat,
 179                         fcc[0], fcc[1], fcc[2], fcc[3],
 180                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 181
 182         /* Check if the hardware supports the requested format, use the default
 183          * format otherwise.
 184          */
 185         for (i = 0; i < stream->nformats; ++i) {
 186                 format = &stream->format[i];
 187                 if (format->fcc == fmt->fmt.pix.pixelformat)
 188                         break;
 189         }
 190
 191         if (i == stream->nformats) {
 192                 format = stream->def_format;
 193                 fmt->fmt.pix.pixelformat = format->fcc;
 194         }
 195
 196         /* Find the closest image size. The distance between image sizes is
 197          * the size in pixels of the non-overlapping regions between the
 198          * requested size and the frame-specified size.
 199          */
 200         rw = fmt->fmt.pix.width;
 201         rh = fmt->fmt.pix.height;
 202         maxd = (unsigned int)-1;
 203
 204         for (i = 0; i < format->nframes; ++i) {
 205                 __u16 w = format->frame[i].wWidth;
 206                 __u16 h = format->frame[i].wHeight;
 207
 208                 d = min(w, rw) * min(h, rh);
 209                 d = w*h + rw*rh - 2*d;
 210                 if (d < maxd) {
 211                         maxd = d;
 212                         frame = &format->frame[i];
 213                 }
 214
 215                 if (maxd == 0)
 216                         break;
 217         }
 218
 219         if (frame == NULL) {
 220                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 221                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 222                 return -EINVAL;
 223         }
 224
 225         /* Use the default frame interval. */
 226         interval = frame->dwDefaultFrameInterval;
 227         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 228                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 229                 (100000000/interval)%10);
 230
 231         /* Set the format index, frame index and frame interval. */
 232         memset(probe, 0, sizeof *probe);
 233         probe->bmHint = 1;      /* dwFrameInterval */
 234         probe->bFormatIndex = format->index;
 235         probe->bFrameIndex = frame->bFrameIndex;
 236         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 237         /* Some webcams stall the probe control set request when the
 238          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 239          * clearly states that the field is read-only from the host, so this
 240          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 241          * the webcam to work around the problem.
 242          *
 243          * The workaround could probably be enabled for all webcams, so the
 244          * quirk can be removed if needed. It's currently useful to detect
 245          * webcam bugs and fix them before they hit the market (providing
 246          * developers test their webcams with the Linux driver as well as with
 247          * the Windows driver).
 248          */
 249         mutex_lock(&stream->mutex);
 250         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 251                 probe->dwMaxVideoFrameSize =
 252                         stream->ctrl.dwMaxVideoFrameSize;
 253
 254         /* Probe the device. */
 255         ret = uvc_probe_video(stream, probe);
 256         mutex_unlock(&stream->mutex);
 257         if (ret < 0)
 258                 goto done;
 259
 260         fmt->fmt.pix.width = frame->wWidth;
 261         fmt->fmt.pix.height = frame->wHeight;
 262         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 263         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 264         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 265         fmt->fmt.pix.colorspace = format->colorspace;
 266         fmt->fmt.pix.priv = 0;
 267
 268         if (uvc_format != NULL)
 269                 *uvc_format = format;
 270         if (uvc_frame != NULL)
 271                 *uvc_frame = frame;
 272
 273 done:
 274         return ret;
 275 }
 276
 277 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 278         struct v4l2_format *fmt)
 279 {
 280         struct uvc_format *format;
 281         struct uvc_frame *frame;
 282         int ret = 0;
 283
 284         if (fmt->type != stream->type)
 285                 return -EINVAL;
 286
 287         mutex_lock(&stream->mutex);
 288         format = stream->cur_format;
 289         frame = stream->cur_frame;
 290
 291         if (format == NULL || frame == NULL) {
 292                 ret = -EINVAL;
 293                 goto done;
 294         }
 295
 296         fmt->fmt.pix.pixelformat = format->fcc;
 297         fmt->fmt.pix.width = frame->wWidth;
 298         fmt->fmt.pix.height = frame->wHeight;
 299         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 300         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 301         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 302         fmt->fmt.pix.colorspace = format->colorspace;
 303         fmt->fmt.pix.priv = 0;
 304
 305 done:
 306         mutex_unlock(&stream->mutex);
 307         return ret;
 308 }
 309
 310 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 311         struct v4l2_format *fmt)
 312 {
 313         struct uvc_streaming_control probe;
 314         struct uvc_format *format;
 315         struct uvc_frame *frame;
 316         int ret;
 317
 318         if (fmt->type != stream->type)
 319                 return -EINVAL;
 320
 321         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 322         if (ret < 0)
 323                 return ret;
 324
 325         mutex_lock(&stream->mutex);
 326
 327         if (uvc_queue_allocated(&stream->queue)) {
 328                 ret = -EBUSY;
 329                 goto done;
 330         }
 331
 332         stream->ctrl = probe;
 333         stream->cur_format = format;
 334         stream->cur_frame = frame;
 335
 336 done:
 337         mutex_unlock(&stream->mutex);
 338         return ret;
 339 }
 340
 341 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 342                 struct v4l2_streamparm *parm)
 343 {
 344         uint32_t numerator, denominator;
 345
 346         if (parm->type != stream->type)
 347                 return -EINVAL;
 348
 349         mutex_lock(&stream->mutex);
 350         numerator = stream->ctrl.dwFrameInterval;
 351         mutex_unlock(&stream->mutex);
 352
 353         denominator = 10000000;
 354         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 355
 356         memset(parm, 0, sizeof *parm);
 357         parm->type = stream->type;
 358
 359         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 360                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 361                 parm->parm.capture.capturemode = 0;
 362                 parm->parm.capture.timeperframe.numerator = numerator;
 363                 parm->parm.capture.timeperframe.denominator = denominator;
 364                 parm->parm.capture.extendedmode = 0;
 365                 parm->parm.capture.readbuffers = 0;
 366         } else {
 367                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 368                 parm->parm.output.outputmode = 0;
 369                 parm->parm.output.timeperframe.numerator = numerator;
 370                 parm->parm.output.timeperframe.denominator = denominator;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 377                 struct v4l2_streamparm *parm)
 378 {
 379         struct uvc_streaming_control probe;
 380         struct v4l2_fract timeperframe;
 381         uint32_t interval;
 382         int ret;
 383
 384         if (parm->type != stream->type)
 385                 return -EINVAL;
 386
 387         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 388                 timeperframe = parm->parm.capture.timeperframe;
 389         else
 390                 timeperframe = parm->parm.output.timeperframe;
 391
 392         interval = uvc_fraction_to_interval(timeperframe.numerator,
 393                 timeperframe.denominator);
 394         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 395                 timeperframe.numerator, timeperframe.denominator, interval);
 396
 397         mutex_lock(&stream->mutex);
 398
 399         if (uvc_queue_streaming(&stream->queue)) {
 400                 mutex_unlock(&stream->mutex);
 401                 return -EBUSY;
 402         }
 403
 404         probe = stream->ctrl;
 405         probe.dwFrameInterval =
 406                 uvc_try_frame_interval(stream->cur_frame, interval);
 407
 408         /* Probe the device with the new settings. */
 409         ret = uvc_probe_video(stream, &probe);
 410         if (ret < 0) {
 411                 mutex_unlock(&stream->mutex);
 412                 return ret;
 413         }
 414
 415         stream->ctrl = probe;
 416         mutex_unlock(&stream->mutex);
 417
 418         /* Return the actual frame period. */
 419         timeperframe.numerator = probe.dwFrameInterval;
 420         timeperframe.denominator = 10000000;
 421         uvc_simplify_fraction(&timeperframe.numerator,
 422                 &timeperframe.denominator, 8, 333);
 423
 424         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 425                 parm->parm.capture.timeperframe = timeperframe;
 426         else
 427                 parm->parm.output.timeperframe = timeperframe;
 428
 429         return 0;
 430 }
 431
 432 /* ------------------------------------------------------------------------
 433  * Privilege management
 434  */
 435
 436 /*
 437  * Privilege management is the multiple-open implementation basis. The current
 438  * implementation is completely transparent for the end-user and doesn't
 439  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 440  * Those ioctls enable finer control on the device (by making possible for a
 441  * user to request exclusive access to a device), but are not mature yet.
 442  * Switching to the V4L2 priority mechanism might be considered in the future
 443  * if this situation changes.
 444  *
 445  * Each open instance of a UVC device can either be in a privileged or
 446  * unprivileged state. Only a single instance can be in a privileged state at
 447  * a given time. Trying to perform an operation that requires privileges will
 448  * automatically acquire the required privileges if possible, or return -EBUSY
 449  * otherwise. Privileges are dismissed when closing the instance or when
 450  * freeing the video buffers using VIDIOC_REQBUFS.
 451  *
 452  * Operations that require privileges are:
 453  *
 454  * - VIDIOC_S_INPUT
 455  * - VIDIOC_S_PARM
 456  * - VIDIOC_S_FMT
 457  * - VIDIOC_REQBUFS
 458  */
 459 static int uvc_acquire_privileges(struct uvc_fh *handle)
 460 {
 461         /* Always succeed if the handle is already privileged. */
 462         if (handle->state == UVC_HANDLE_ACTIVE)
 463                 return 0;
 464
 465         /* Check if the device already has a privileged handle. */
 466         if (atomic_inc_return(&handle->stream->active) != 1) {
 467                 atomic_dec(&handle->stream->active);
 468                 return -EBUSY;
 469         }
 470
 471         handle->state = UVC_HANDLE_ACTIVE;
 472         return 0;
 473 }
 474
 475 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 476 {
 477         if (handle->state == UVC_HANDLE_ACTIVE)
 478                 atomic_dec(&handle->stream->active);
 479
 480         handle->state = UVC_HANDLE_PASSIVE;
 481 }
 482
 483 static int uvc_has_privileges(struct uvc_fh *handle)
 484 {
 485         return handle->state == UVC_HANDLE_ACTIVE;
 486 }
 487
 488 /* ------------------------------------------------------------------------
 489  * V4L2 file operations
 490  */
 491
 492 static int uvc_v4l2_open(struct file *file)
 493 {
 494         struct uvc_streaming *stream;
 495         struct uvc_fh *handle;
 496         int ret = 0;
 497
 498         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 499         stream = video_drvdata(file);
 500
 501         ret = usb_autopm_get_interface(stream->dev->intf);
 502         if (ret < 0)
 503                 return ret;
 504
 505         /* Create the device handle. */
 506         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 507         if (handle == NULL) {
 508                 usb_autopm_put_interface(stream->dev->intf);
 509                 return -ENOMEM;
 510         }
 511
 512         mutex_lock(&stream->dev->lock);
 513         if (stream->dev->users == 0) {
 514                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 515                 if (ret < 0) {
 516                         mutex_unlock(&stream->dev->lock);
 517                         usb_autopm_put_interface(stream->dev->intf);
 518                         kfree(handle);
 519                         return ret;
 520                 }
 521         }
 522
 523         stream->dev->users++;
 524         mutex_unlock(&stream->dev->lock);
 525
 526         v4l2_fh_init(&handle->vfh, &stream->vdev);
 527         v4l2_fh_add(&handle->vfh);
 528         handle->chain = stream->chain;
 529         handle->stream = stream;
 530         handle->state = UVC_HANDLE_PASSIVE;
 531         file->private_data = handle;
 532
 533         return 0;
 534 }
 535
 536 static int uvc_v4l2_release(struct file *file)
 537 {
 538         struct uvc_fh *handle = file->private_data;
 539         struct uvc_streaming *stream = handle->stream;
 540
 541         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 542
 543         /* Only free resources if this is a privileged handle. */
 544         if (uvc_has_privileges(handle))
 545                 uvc_queue_release(&stream->queue);
 546
 547         /* Release the file handle. */
 548         uvc_dismiss_privileges(handle);
 549         v4l2_fh_del(&handle->vfh);
 550         v4l2_fh_exit(&handle->vfh);
 551         kfree(handle);
 552         file->private_data = NULL;
 553
 554         mutex_lock(&stream->dev->lock);
 555         if (--stream->dev->users == 0)
 556                 uvc_status_stop(stream->dev);
 557         mutex_unlock(&stream->dev->lock);
 558
 559         usb_autopm_put_interface(stream->dev->intf);
 560         return 0;
 561 }
 562
 563 static int uvc_ioctl_querycap(struct file *file, void *fh,
 564                               struct v4l2_capability *cap)
 565 {
 566         struct video_device *vdev = video_devdata(file);
 567         struct uvc_fh *handle = file->private_data;
 568         struct uvc_video_chain *chain = handle->chain;
 569         struct uvc_streaming *stream = handle->stream;
 570
 571         strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 572         strlcpy(cap->card, vdev->name, sizeof(cap->card));
 573         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 574         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 575                           | chain->caps;
 576         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 577                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 578         else
 579                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 580
 581         return 0;
 582 }
 583
 584 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 585                               struct v4l2_fmtdesc *fmt)
 586 {
 587         struct uvc_format *format;
 588         enum v4l2_buf_type type = fmt->type;
 589         __u32 index = fmt->index;
 590
 591         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 592                 return -EINVAL;
 593
 594         memset(fmt, 0, sizeof(*fmt));
 595         fmt->index = index;
 596         fmt->type = type;
 597
 598         format = &stream->format[fmt->index];
 599         fmt->flags = 0;
 600         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 601                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 602         strlcpy(fmt->description, format->name, sizeof(fmt->description));
 603         fmt->description[sizeof(fmt->description) - 1] = 0;
 604         fmt->pixelformat = format->fcc;
 605         return 0;
 606 }
 607
 608 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 609                                       struct v4l2_fmtdesc *fmt)
 610 {
 611         struct uvc_fh *handle = fh;
 612         struct uvc_streaming *stream = handle->stream;
 613
 614         return uvc_ioctl_enum_fmt(stream, fmt);
 615 }
 616
 617 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 618                                       struct v4l2_fmtdesc *fmt)
 619 {
 620         struct uvc_fh *handle = fh;
 621         struct uvc_streaming *stream = handle->stream;
 622
 623         return uvc_ioctl_enum_fmt(stream, fmt);
 624 }
 625
 626 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 627                                    struct v4l2_format *fmt)
 628 {
 629         struct uvc_fh *handle = fh;
 630         struct uvc_streaming *stream = handle->stream;
 631
 632         return uvc_v4l2_get_format(stream, fmt);
 633 }
 634
 635 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 636                                    struct v4l2_format *fmt)
 637 {
 638         struct uvc_fh *handle = fh;
 639         struct uvc_streaming *stream = handle->stream;
 640
 641         return uvc_v4l2_get_format(stream, fmt);
 642 }
 643
 644 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 645                                    struct v4l2_format *fmt)
 646 {
 647         struct uvc_fh *handle = fh;
 648         struct uvc_streaming *stream = handle->stream;
 649         int ret;
 650
 651         ret = uvc_acquire_privileges(handle);
 652         if (ret < 0)
 653                 return ret;
 654
 655         return uvc_v4l2_set_format(stream, fmt);
 656 }
 657
 658 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 659                                    struct v4l2_format *fmt)
 660 {
 661         struct uvc_fh *handle = fh;
 662         struct uvc_streaming *stream = handle->stream;
 663         int ret;
 664
 665         ret = uvc_acquire_privileges(handle);
 666         if (ret < 0)
 667                 return ret;
 668
 669         return uvc_v4l2_set_format(stream, fmt);
 670 }
 671
 672 static int uvc_ioctl_try_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         struct uvc_streaming_control probe;
 678
 679         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 680 }
 681
 682 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 683                                      struct v4l2_format *fmt)
 684 {
 685         struct uvc_fh *handle = fh;
 686         struct uvc_streaming *stream = handle->stream;
 687         struct uvc_streaming_control probe;
 688
 689         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 690 }
 691
 692 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 693                              struct v4l2_requestbuffers *rb)
 694 {
 695         struct uvc_fh *handle = fh;
 696         struct uvc_streaming *stream = handle->stream;
 697         int ret;
 698
 699         ret = uvc_acquire_privileges(handle);
 700         if (ret < 0)
 701                 return ret;
 702
 703         mutex_lock(&stream->mutex);
 704         ret = uvc_request_buffers(&stream->queue, rb);
 705         mutex_unlock(&stream->mutex);
 706         if (ret < 0)
 707                 return ret;
 708
 709         if (ret == 0)
 710                 uvc_dismiss_privileges(handle);
 711
 712         return 0;
 713 }
 714
 715 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 716                               struct v4l2_buffer *buf)
 717 {
 718         struct uvc_fh *handle = fh;
 719         struct uvc_streaming *stream = handle->stream;
 720
 721         if (!uvc_has_privileges(handle))
 722                 return -EBUSY;
 723
 724         return uvc_query_buffer(&stream->queue, buf);
 725 }
 726
 727 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 728 {
 729         struct uvc_fh *handle = fh;
 730         struct uvc_streaming *stream = handle->stream;
 731
 732         if (!uvc_has_privileges(handle))
 733                 return -EBUSY;
 734
 735         return uvc_queue_buffer(&stream->queue, buf);
 736 }
 737
 738 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 739                             struct v4l2_exportbuffer *exp)
 740 {
 741         struct uvc_fh *handle = fh;
 742         struct uvc_streaming *stream = handle->stream;
 743
 744         if (!uvc_has_privileges(handle))
 745                 return -EBUSY;
 746
 747         return uvc_export_buffer(&stream->queue, exp);
 748 }
 749
 750 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 751 {
 752         struct uvc_fh *handle = fh;
 753         struct uvc_streaming *stream = handle->stream;
 754
 755         if (!uvc_has_privileges(handle))
 756                 return -EBUSY;
 757
 758         return uvc_dequeue_buffer(&stream->queue, buf,
 759                                   file->f_flags & O_NONBLOCK);
 760 }
 761
 762 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 763                                   struct v4l2_create_buffers *cb)
 764 {
 765         struct uvc_fh *handle = fh;
 766         struct uvc_streaming *stream = handle->stream;
 767         int ret;
 768
 769         ret = uvc_acquire_privileges(handle);
 770         if (ret < 0)
 771                 return ret;
 772
 773         return uvc_create_buffers(&stream->queue, cb);
 774 }
 775
 776 static int uvc_ioctl_streamon(struct file *file, void *fh,
 777                               enum v4l2_buf_type type)
 778 {
 779         struct uvc_fh *handle = fh;
 780         struct uvc_streaming *stream = handle->stream;
 781         int ret;
 782
 783         if (!uvc_has_privileges(handle))
 784                 return -EBUSY;
 785
 786         mutex_lock(&stream->mutex);
 787         ret = uvc_queue_streamon(&stream->queue, type);
 788         mutex_unlock(&stream->mutex);
 789
 790         return ret;
 791 }
 792
 793 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 794                                enum v4l2_buf_type type)
 795 {
 796         struct uvc_fh *handle = fh;
 797         struct uvc_streaming *stream = handle->stream;
 798
 799         if (!uvc_has_privileges(handle))
 800                 return -EBUSY;
 801
 802         mutex_lock(&stream->mutex);
 803         uvc_queue_streamoff(&stream->queue, type);
 804         mutex_unlock(&stream->mutex);
 805
 806         return 0;
 807 }
 808
 809 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 810                                 struct v4l2_input *input)
 811 {
 812         struct uvc_fh *handle = fh;
 813         struct uvc_video_chain *chain = handle->chain;
 814         const struct uvc_entity *selector = chain->selector;
 815         struct uvc_entity *iterm = NULL;
 816         u32 index = input->index;
 817         int pin = 0;
 818
 819         if (selector == NULL ||
 820             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 821                 if (index != 0)
 822                         return -EINVAL;
 823                 list_for_each_entry(iterm, &chain->entities, chain) {
 824                         if (UVC_ENTITY_IS_ITERM(iterm))
 825                                 break;
 826                 }
 827                 pin = iterm->id;
 828         } else if (index < selector->bNrInPins) {
 829                 pin = selector->baSourceID[index];
 830                 list_for_each_entry(iterm, &chain->entities, chain) {
 831                         if (!UVC_ENTITY_IS_ITERM(iterm))
 832                                 continue;
 833                         if (iterm->id == pin)
 834                                 break;
 835                 }
 836         }
 837
 838         if (iterm == NULL || iterm->id != pin)
 839                 return -EINVAL;
 840
 841         memset(input, 0, sizeof(*input));
 842         input->index = index;
 843         strlcpy(input->name, iterm->name, sizeof(input->name));
 844         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 845                 input->type = V4L2_INPUT_TYPE_CAMERA;
 846
 847         return 0;
 848 }
 849
 850 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 851 {
 852         struct uvc_fh *handle = fh;
 853         struct uvc_video_chain *chain = handle->chain;
 854         int ret;
 855         u8 i;
 856
 857         if (chain->selector == NULL ||
 858             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 859                 *input = 0;
 860                 return 0;
 861         }
 862
 863         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 864                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 865                              &i, 1);
 866         if (ret < 0)
 867                 return ret;
 868
 869         *input = i - 1;
 870         return 0;
 871 }
 872
 873 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 874 {
 875         struct uvc_fh *handle = fh;
 876         struct uvc_video_chain *chain = handle->chain;
 877         int ret;
 878         u32 i;
 879
 880         ret = uvc_acquire_privileges(handle);
 881         if (ret < 0)
 882                 return ret;
 883
 884         if (chain->selector == NULL ||
 885             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 886                 if (input)
 887                         return -EINVAL;
 888                 return 0;
 889         }
 890
 891         if (input >= chain->selector->bNrInPins)
 892                 return -EINVAL;
 893
 894         i = input + 1;
 895         return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 896                               chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 897                               &i, 1);
 898 }
 899
 900 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 901                                struct v4l2_queryctrl *qc)
 902 {
 903         struct uvc_fh *handle = fh;
 904         struct uvc_video_chain *chain = handle->chain;
 905
 906         return uvc_query_v4l2_ctrl(chain, qc);
 907 }
 908
 909 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 910                                     struct v4l2_query_ext_ctrl *qec)
 911 {
 912         struct uvc_fh *handle = fh;
 913         struct uvc_video_chain *chain = handle->chain;
 914         struct v4l2_queryctrl qc = { qec->id };
 915         int ret;
 916
 917         ret = uvc_query_v4l2_ctrl(chain, &qc);
 918         if (ret)
 919                 return ret;
 920
 921         qec->id = qc.id;
 922         qec->type = qc.type;
 923         strlcpy(qec->name, qc.name, sizeof(qec->name));
 924         qec->minimum = qc.minimum;
 925         qec->maximum = qc.maximum;
 926         qec->step = qc.step;
 927         qec->default_value = qc.default_value;
 928         qec->flags = qc.flags;
 929         qec->elem_size = 4;
 930         qec->elems = 1;
 931         qec->nr_of_dims = 0;
 932         memset(qec->dims, 0, sizeof(qec->dims));
 933         memset(qec->reserved, 0, sizeof(qec->reserved));
 934
 935         return 0;
 936 }
 937
 938 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 939                             struct v4l2_control *ctrl)
 940 {
 941         struct uvc_fh *handle = fh;
 942         struct uvc_video_chain *chain = handle->chain;
 943         struct v4l2_ext_control xctrl;
 944         int ret;
 945
 946         memset(&xctrl, 0, sizeof(xctrl));
 947         xctrl.id = ctrl->id;
 948
 949         ret = uvc_ctrl_begin(chain);
 950         if (ret < 0)
 951                 return ret;
 952
 953         ret = uvc_ctrl_get(chain, &xctrl);
 954         uvc_ctrl_rollback(handle);
 955         if (ret < 0)
 956                 return ret;
 957
 958         ctrl->value = xctrl.value;
 959         return 0;
 960 }
 961
 962 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 963                             struct v4l2_control *ctrl)
 964 {
 965         struct uvc_fh *handle = fh;
 966         struct uvc_video_chain *chain = handle->chain;
 967         struct v4l2_ext_control xctrl;
 968         int ret;
 969
 970         memset(&xctrl, 0, sizeof(xctrl));
 971         xctrl.id = ctrl->id;
 972         xctrl.value = ctrl->value;
 973
 974         ret = uvc_ctrl_begin(chain);
 975         if (ret < 0)
 976                 return ret;
 977
 978         ret = uvc_ctrl_set(chain, &xctrl);
 979         if (ret < 0) {
 980                 uvc_ctrl_rollback(handle);
 981                 return ret;
 982         }
 983
 984         ret = uvc_ctrl_commit(handle, &xctrl, 1);
 985         if (ret < 0)
 986                 return ret;
 987
 988         ctrl->value = xctrl.value;
 989         return 0;
 990 }
 991
 992 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 993                                  struct v4l2_ext_controls *ctrls)
 994 {
 995         struct uvc_fh *handle = fh;
 996         struct uvc_video_chain *chain = handle->chain;
 997         struct v4l2_ext_control *ctrl = ctrls->controls;
 998         unsigned int i;
 999         int ret;
1000
1001         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1002                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1003                         struct v4l2_queryctrl qc = { .id = ctrl->id };
1004
1005                         ret = uvc_query_v4l2_ctrl(chain, &qc);
1006                         if (ret < 0) {
1007                                 ctrls->error_idx = i;
1008                                 return ret;
1009                         }
1010
1011                         ctrl->value = qc.default_value;
1012                 }
1013
1014                 return 0;
1015         }
1016
1017         ret = uvc_ctrl_begin(chain);
1018         if (ret < 0)
1019                 return ret;
1020
1021         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1022                 ret = uvc_ctrl_get(chain, ctrl);
1023                 if (ret < 0) {
1024                         uvc_ctrl_rollback(handle);
1025                         ctrls->error_idx = i;
1026                         return ret;
1027                 }
1028         }
1029
1030         ctrls->error_idx = 0;
1031
1032         return uvc_ctrl_rollback(handle);
1033 }
1034
1035 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1036                                      struct v4l2_ext_controls *ctrls,
1037                                      bool commit)
1038 {
1039         struct v4l2_ext_control *ctrl = ctrls->controls;
1040         struct uvc_video_chain *chain = handle->chain;
1041         unsigned int i;
1042         int ret;
1043
1044         /* Default value cannot be changed */
1045         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1046                 return -EINVAL;
1047
1048         ret = uvc_ctrl_begin(chain);
1049         if (ret < 0)
1050                 return ret;
1051
1052         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1053                 ret = uvc_ctrl_set(chain, ctrl);
1054                 if (ret < 0) {
1055                         uvc_ctrl_rollback(handle);
1056                         ctrls->error_idx = commit ? ctrls->count : i;
1057                         return ret;
1058                 }
1059         }
1060
1061         ctrls->error_idx = 0;
1062
1063         if (commit)
1064                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1065         else
1066                 return uvc_ctrl_rollback(handle);
1067 }
1068
1069 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1070                                  struct v4l2_ext_controls *ctrls)
1071 {
1072         struct uvc_fh *handle = fh;
1073
1074         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1075 }
1076
1077 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1078                                    struct v4l2_ext_controls *ctrls)
1079 {
1080         struct uvc_fh *handle = fh;
1081
1082         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1083 }
1084
1085 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1086                                struct v4l2_querymenu *qm)
1087 {
1088         struct uvc_fh *handle = fh;
1089         struct uvc_video_chain *chain = handle->chain;
1090
1091         return uvc_query_v4l2_menu(chain, qm);
1092 }
1093
1094 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1095                                  struct v4l2_selection *sel)
1096 {
1097         struct uvc_fh *handle = fh;
1098         struct uvc_streaming *stream = handle->stream;
1099
1100         if (sel->type != stream->type)
1101                 return -EINVAL;
1102
1103         switch (sel->target) {
1104         case V4L2_SEL_TGT_CROP_DEFAULT:
1105         case V4L2_SEL_TGT_CROP_BOUNDS:
1106                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1107                         return -EINVAL;
1108                 break;
1109         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1110         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1111                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1112                         return -EINVAL;
1113                 break;
1114         default:
1115                 return -EINVAL;
1116         }
1117
1118         sel->r.left = 0;
1119         sel->r.top = 0;
1120         mutex_lock(&stream->mutex);
1121         sel->r.width = stream->cur_frame->wWidth;
1122         sel->r.height = stream->cur_frame->wHeight;
1123         mutex_unlock(&stream->mutex);
1124
1125         return 0;
1126 }
1127
1128 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1129                             struct v4l2_streamparm *parm)
1130 {
1131         struct uvc_fh *handle = fh;
1132         struct uvc_streaming *stream = handle->stream;
1133
1134         return uvc_v4l2_get_streamparm(stream, parm);
1135 }
1136
1137 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1138                             struct v4l2_streamparm *parm)
1139 {
1140         struct uvc_fh *handle = fh;
1141         struct uvc_streaming *stream = handle->stream;
1142         int ret;
1143
1144         ret = uvc_acquire_privileges(handle);
1145         if (ret < 0)
1146                 return ret;
1147
1148         return uvc_v4l2_set_streamparm(stream, parm);
1149 }
1150
1151 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1152                                      struct v4l2_frmsizeenum *fsize)
1153 {
1154         struct uvc_fh *handle = fh;
1155         struct uvc_streaming *stream = handle->stream;
1156         struct uvc_format *format = NULL;
1157         struct uvc_frame *frame;
1158         int i;
1159
1160         /* Look for the given pixel format */
1161         for (i = 0; i < stream->nformats; i++) {
1162                 if (stream->format[i].fcc == fsize->pixel_format) {
1163                         format = &stream->format[i];
1164                         break;
1165                 }
1166         }
1167         if (format == NULL)
1168                 return -EINVAL;
1169
1170         if (fsize->index >= format->nframes)
1171                 return -EINVAL;
1172
1173         frame = &format->frame[fsize->index];
1174         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1175         fsize->discrete.width = frame->wWidth;
1176         fsize->discrete.height = frame->wHeight;
1177         return 0;
1178 }
1179
1180 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1181                                          struct v4l2_frmivalenum *fival)
1182 {
1183         struct uvc_fh *handle = fh;
1184         struct uvc_streaming *stream = handle->stream;
1185         struct uvc_format *format = NULL;
1186         struct uvc_frame *frame = NULL;
1187         int i;
1188
1189         /* Look for the given pixel format and frame size */
1190         for (i = 0; i < stream->nformats; i++) {
1191                 if (stream->format[i].fcc == fival->pixel_format) {
1192                         format = &stream->format[i];
1193                         break;
1194                 }
1195         }
1196         if (format == NULL)
1197                 return -EINVAL;
1198
1199         for (i = 0; i < format->nframes; i++) {
1200                 if (format->frame[i].wWidth == fival->width &&
1201                     format->frame[i].wHeight == fival->height) {
1202                         frame = &format->frame[i];
1203                         break;
1204                 }
1205         }
1206         if (frame == NULL)
1207                 return -EINVAL;
1208
1209         if (frame->bFrameIntervalType) {
1210                 if (fival->index >= frame->bFrameIntervalType)
1211                         return -EINVAL;
1212
1213                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1214                 fival->discrete.numerator =
1215                         frame->dwFrameInterval[fival->index];
1216                 fival->discrete.denominator = 10000000;
1217                 uvc_simplify_fraction(&fival->discrete.numerator,
1218                         &fival->discrete.denominator, 8, 333);
1219         } else {
1220                 if (fival->index)
1221                         return -EINVAL;
1222
1223                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1224                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1225                 fival->stepwise.min.denominator = 10000000;
1226                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1227                 fival->stepwise.max.denominator = 10000000;
1228                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1229                 fival->stepwise.step.denominator = 10000000;
1230                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1231                         &fival->stepwise.min.denominator, 8, 333);
1232                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1233                         &fival->stepwise.max.denominator, 8, 333);
1234                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1235                         &fival->stepwise.step.denominator, 8, 333);
1236         }
1237
1238         return 0;
1239 }
1240
1241 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1242                                      const struct v4l2_event_subscription *sub)
1243 {
1244         switch (sub->type) {
1245         case V4L2_EVENT_CTRL:
1246                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1247         default:
1248                 return -EINVAL;
1249         }
1250 }
1251
1252 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1253                               unsigned int cmd, void *arg)
1254 {
1255         struct uvc_fh *handle = fh;
1256         struct uvc_video_chain *chain = handle->chain;
1257
1258         switch (cmd) {
1259         /* Dynamic controls. */
1260         case UVCIOC_CTRL_MAP:
1261                 return uvc_ioctl_ctrl_map(chain, arg);
1262
1263         case UVCIOC_CTRL_QUERY:
1264                 return uvc_xu_ctrl_query(chain, arg);
1265
1266         default:
1267                 return -ENOTTY;
1268         }
1269 }
1270
1271 #ifdef CONFIG_COMPAT
1272 struct uvc_xu_control_mapping32 {
1273         __u32 id;
1274         __u8 name[32];
1275         __u8 entity[16];
1276         __u8 selector;
1277
1278         __u8 size;
1279         __u8 offset;
1280         __u32 v4l2_type;
1281         __u32 data_type;
1282
1283         compat_caddr_t menu_info;
1284         __u32 menu_count;
1285
1286         __u32 reserved[4];
1287 };
1288
1289 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1290                         const struct uvc_xu_control_mapping32 __user *up)
1291 {
1292         compat_caddr_t p;
1293
1294         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1295             __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1296             __get_user(kp->menu_count, &up->menu_count))
1297                 return -EFAULT;
1298
1299         memset(kp->reserved, 0, sizeof(kp->reserved));
1300
1301         if (kp->menu_count == 0) {
1302                 kp->menu_info = NULL;
1303                 return 0;
1304         }
1305
1306         if (__get_user(p, &up->menu_info))
1307                 return -EFAULT;
1308         kp->menu_info = compat_ptr(p);
1309
1310         return 0;
1311 }
1312
1313 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1314                         struct uvc_xu_control_mapping32 __user *up)
1315 {
1316         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1317             __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1318             __put_user(kp->menu_count, &up->menu_count))
1319                 return -EFAULT;
1320
1321         if (__clear_user(up->reserved, sizeof(up->reserved)))
1322                 return -EFAULT;
1323
1324         return 0;
1325 }
1326
1327 struct uvc_xu_control_query32 {
1328         __u8 unit;
1329         __u8 selector;
1330         __u8 query;
1331         __u16 size;
1332         compat_caddr_t data;
1333 };
1334
1335 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1336                         const struct uvc_xu_control_query32 __user *up)
1337 {
1338         compat_caddr_t p;
1339
1340         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1341             __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1342                 return -EFAULT;
1343
1344         if (kp->size == 0) {
1345                 kp->data = NULL;
1346                 return 0;
1347         }
1348
1349         if (__get_user(p, &up->data))
1350                 return -EFAULT;
1351         kp->data = compat_ptr(p);
1352
1353         return 0;
1354 }
1355
1356 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1357                         struct uvc_xu_control_query32 __user *up)
1358 {
1359         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1360             __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1361                 return -EFAULT;
1362
1363         return 0;
1364 }
1365
1366 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1367 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1368
1369 static long uvc_v4l2_compat_ioctl32(struct file *file,
1370                      unsigned int cmd, unsigned long arg)
1371 {
1372         struct uvc_fh *handle = file->private_data;
1373         union {
1374                 struct uvc_xu_control_mapping xmap;
1375                 struct uvc_xu_control_query xqry;
1376         } karg;
1377         void __user *up = compat_ptr(arg);
1378         long ret;
1379
1380         switch (cmd) {
1381         case UVCIOC_CTRL_MAP32:
1382                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1383                 if (ret)
1384                         return ret;
1385                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1386                 if (ret)
1387                         return ret;
1388                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1389                 if (ret)
1390                         return ret;
1391
1392                 break;
1393
1394         case UVCIOC_CTRL_QUERY32:
1395                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1396                 if (ret)
1397                         return ret;
1398                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1399                 if (ret)
1400                         return ret;
1401                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1402                 if (ret)
1403                         return ret;
1404                 break;
1405
1406         default:
1407                 return -ENOIOCTLCMD;
1408         }
1409
1410         return ret;
1411 }
1412 #endif
1413
1414 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1415                     size_t count, loff_t *ppos)
1416 {
1417         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1418         return -EINVAL;
1419 }
1420
1421 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1422 {
1423         struct uvc_fh *handle = file->private_data;
1424         struct uvc_streaming *stream = handle->stream;
1425
1426         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1427
1428         return uvc_queue_mmap(&stream->queue, vma);
1429 }
1430
1431 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1432 {
1433         struct uvc_fh *handle = file->private_data;
1434         struct uvc_streaming *stream = handle->stream;
1435
1436         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1437
1438         return uvc_queue_poll(&stream->queue, file, wait);
1439 }
1440
1441 #ifndef CONFIG_MMU
1442 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1443                 unsigned long addr, unsigned long len, unsigned long pgoff,
1444                 unsigned long flags)
1445 {
1446         struct uvc_fh *handle = file->private_data;
1447         struct uvc_streaming *stream = handle->stream;
1448
1449         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1450
1451         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1452 }
1453 #endif
1454
1455 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1456         .vidioc_querycap = uvc_ioctl_querycap,
1457         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1458         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1459         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1460         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1461         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1462         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1463         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1464         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1465         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1466         .vidioc_querybuf = uvc_ioctl_querybuf,
1467         .vidioc_qbuf = uvc_ioctl_qbuf,
1468         .vidioc_expbuf = uvc_ioctl_expbuf,
1469         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1470         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1471         .vidioc_streamon = uvc_ioctl_streamon,
1472         .vidioc_streamoff = uvc_ioctl_streamoff,
1473         .vidioc_enum_input = uvc_ioctl_enum_input,
1474         .vidioc_g_input = uvc_ioctl_g_input,
1475         .vidioc_s_input = uvc_ioctl_s_input,
1476         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1477         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1478         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1479         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1480         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1481         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1482         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1483         .vidioc_querymenu = uvc_ioctl_querymenu,
1484         .vidioc_g_selection = uvc_ioctl_g_selection,
1485         .vidioc_g_parm = uvc_ioctl_g_parm,
1486         .vidioc_s_parm = uvc_ioctl_s_parm,
1487         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1488         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1489         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1490         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1491         .vidioc_default = uvc_ioctl_default,
1492 };
1493
1494 const struct v4l2_file_operations uvc_fops = {
1495         .owner          = THIS_MODULE,
1496         .open           = uvc_v4l2_open,
1497         .release        = uvc_v4l2_release,
1498         .unlocked_ioctl = video_ioctl2,
1499 #ifdef CONFIG_COMPAT
1500         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1501 #endif
1502         .read           = uvc_v4l2_read,
1503         .mmap           = uvc_v4l2_mmap,
1504         .poll           = uvc_v4l2_poll,
1505 #ifndef CONFIG_MMU
1506         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1507 #endif
1508 };
1509