drivers/media/usb/uvc/uvc_v4l2.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   4  *
   5  *      Copyright (C) 2005-2010
   6  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  */
   8
   9 #include <linux/compat.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/usb.h>
  15 #include <linux/videodev2.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/mm.h>
  18 #include <linux/wait.h>
  19 #include <linux/atomic.h>
  20
  21 #include <media/v4l2-common.h>
  22 #include <media/v4l2-ctrls.h>
  23 #include <media/v4l2-event.h>
  24 #include <media/v4l2-ioctl.h>
  25
  26 #include "uvcvideo.h"
  27
  28 /* ------------------------------------------------------------------------
  29  * UVC ioctls
  30  */
  31 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
  32         struct uvc_xu_control_mapping *xmap)
  33 {
  34         struct uvc_control_mapping *map;
  35         unsigned int size;
  36         int ret;
  37
  38         map = kzalloc(sizeof(*map), GFP_KERNEL);
  39         if (map == NULL)
  40                 return -ENOMEM;
  41
  42         map->id = xmap->id;
  43         memcpy(map->name, xmap->name, sizeof(map->name));
  44         memcpy(map->entity, xmap->entity, sizeof(map->entity));
  45         map->selector = xmap->selector;
  46         map->size = xmap->size;
  47         map->offset = xmap->offset;
  48         map->v4l2_type = xmap->v4l2_type;
  49         map->data_type = xmap->data_type;
  50
  51         switch (xmap->v4l2_type) {
  52         case V4L2_CTRL_TYPE_INTEGER:
  53         case V4L2_CTRL_TYPE_BOOLEAN:
  54         case V4L2_CTRL_TYPE_BUTTON:
  55                 break;
  56
  57         case V4L2_CTRL_TYPE_MENU:
  58                 /* Prevent excessive memory consumption, as well as integer
  59                  * overflows.
  60                  */
  61                 if (xmap->menu_count == 0 ||
  62                     xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
  63                         ret = -EINVAL;
  64                         goto free_map;
  65                 }
  66
  67                 size = xmap->menu_count * sizeof(*map->menu_info);
  68                 map->menu_info = memdup_user(xmap->menu_info, size);
  69                 if (IS_ERR(map->menu_info)) {
  70                         ret = PTR_ERR(map->menu_info);
  71                         goto free_map;
  72                 }
  73
  74                 map->menu_count = xmap->menu_count;
  75                 break;
  76
  77         default:
  78                 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
  79                           "%u.\n", xmap->v4l2_type);
  80                 ret = -ENOTTY;
  81                 goto free_map;
  82         }
  83
  84         ret = uvc_ctrl_add_mapping(chain, map);
  85
  86         kfree(map->menu_info);
  87 free_map:
  88         kfree(map);
  89
  90         return ret;
  91 }
  92
  93 /* ------------------------------------------------------------------------
  94  * V4L2 interface
  95  */
  96
  97 /*
  98  * Find the frame interval closest to the requested frame interval for the
  99  * given frame format and size. This should be done by the device as part of
 100  * the Video Probe and Commit negotiation, but some hardware don't implement
 101  * that feature.
 102  */
 103 static u32 uvc_try_frame_interval(struct uvc_frame *frame, u32 interval)
 104 {
 105         unsigned int i;
 106
 107         if (frame->bFrameIntervalType) {
 108                 u32 best = -1, dist;
 109
 110                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 111                         dist = interval > frame->dwFrameInterval[i]
 112                              ? interval - frame->dwFrameInterval[i]
 113                              : frame->dwFrameInterval[i] - interval;
 114
 115                         if (dist > best)
 116                                 break;
 117
 118                         best = dist;
 119                 }
 120
 121                 interval = frame->dwFrameInterval[i-1];
 122         } else {
 123                 const u32 min = frame->dwFrameInterval[0];
 124                 const u32 max = frame->dwFrameInterval[1];
 125                 const u32 step = frame->dwFrameInterval[2];
 126
 127                 interval = min + (interval - min + step/2) / step * step;
 128                 if (interval > max)
 129                         interval = max;
 130         }
 131
 132         return interval;
 133 }
 134
 135 static u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
 136         const struct uvc_frame *frame)
 137 {
 138         switch (format->fcc) {
 139         case V4L2_PIX_FMT_NV12:
 140         case V4L2_PIX_FMT_YVU420:
 141         case V4L2_PIX_FMT_YUV420:
 142         case V4L2_PIX_FMT_M420:
 143                 return frame->wWidth;
 144
 145         default:
 146                 return format->bpp * frame->wWidth / 8;
 147         }
 148 }
 149
 150 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 151         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 152         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 153 {
 154         struct uvc_format *format = NULL;
 155         struct uvc_frame *frame = NULL;
 156         u16 rw, rh;
 157         unsigned int d, maxd;
 158         unsigned int i;
 159         u32 interval;
 160         int ret = 0;
 161         u8 *fcc;
 162
 163         if (fmt->type != stream->type)
 164                 return -EINVAL;
 165
 166         fcc = (u8 *)&fmt->fmt.pix.pixelformat;
 167         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 168                         fmt->fmt.pix.pixelformat,
 169                         fcc[0], fcc[1], fcc[2], fcc[3],
 170                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 171
 172         /* Check if the hardware supports the requested format, use the default
 173          * format otherwise.
 174          */
 175         for (i = 0; i < stream->nformats; ++i) {
 176                 format = &stream->format[i];
 177                 if (format->fcc == fmt->fmt.pix.pixelformat)
 178                         break;
 179         }
 180
 181         if (i == stream->nformats) {
 182                 format = stream->def_format;
 183                 fmt->fmt.pix.pixelformat = format->fcc;
 184         }
 185
 186         /* Find the closest image size. The distance between image sizes is
 187          * the size in pixels of the non-overlapping regions between the
 188          * requested size and the frame-specified size.
 189          */
 190         rw = fmt->fmt.pix.width;
 191         rh = fmt->fmt.pix.height;
 192         maxd = (unsigned int)-1;
 193
 194         for (i = 0; i < format->nframes; ++i) {
 195                 u16 w = format->frame[i].wWidth;
 196                 u16 h = format->frame[i].wHeight;
 197
 198                 d = min(w, rw) * min(h, rh);
 199                 d = w*h + rw*rh - 2*d;
 200                 if (d < maxd) {
 201                         maxd = d;
 202                         frame = &format->frame[i];
 203                 }
 204
 205                 if (maxd == 0)
 206                         break;
 207         }
 208
 209         if (frame == NULL) {
 210                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 211                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 212                 return -EINVAL;
 213         }
 214
 215         /* Use the default frame interval. */
 216         interval = frame->dwDefaultFrameInterval;
 217         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 218                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 219                 (100000000/interval)%10);
 220
 221         /* Set the format index, frame index and frame interval. */
 222         memset(probe, 0, sizeof(*probe));
 223         probe->bmHint = 1;      /* dwFrameInterval */
 224         probe->bFormatIndex = format->index;
 225         probe->bFrameIndex = frame->bFrameIndex;
 226         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 227         /* Some webcams stall the probe control set request when the
 228          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 229          * clearly states that the field is read-only from the host, so this
 230          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 231          * the webcam to work around the problem.
 232          *
 233          * The workaround could probably be enabled for all webcams, so the
 234          * quirk can be removed if needed. It's currently useful to detect
 235          * webcam bugs and fix them before they hit the market (providing
 236          * developers test their webcams with the Linux driver as well as with
 237          * the Windows driver).
 238          */
 239         mutex_lock(&stream->mutex);
 240         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 241                 probe->dwMaxVideoFrameSize =
 242                         stream->ctrl.dwMaxVideoFrameSize;
 243
 244         /* Probe the device. */
 245         ret = uvc_probe_video(stream, probe);
 246         mutex_unlock(&stream->mutex);
 247         if (ret < 0)
 248                 goto done;
 249
 250         fmt->fmt.pix.width = frame->wWidth;
 251         fmt->fmt.pix.height = frame->wHeight;
 252         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 253         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 254         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 255         fmt->fmt.pix.colorspace = format->colorspace;
 256
 257         if (uvc_format != NULL)
 258                 *uvc_format = format;
 259         if (uvc_frame != NULL)
 260                 *uvc_frame = frame;
 261
 262 done:
 263         return ret;
 264 }
 265
 266 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 267         struct v4l2_format *fmt)
 268 {
 269         struct uvc_format *format;
 270         struct uvc_frame *frame;
 271         int ret = 0;
 272
 273         if (fmt->type != stream->type)
 274                 return -EINVAL;
 275
 276         mutex_lock(&stream->mutex);
 277         format = stream->cur_format;
 278         frame = stream->cur_frame;
 279
 280         if (format == NULL || frame == NULL) {
 281                 ret = -EINVAL;
 282                 goto done;
 283         }
 284
 285         fmt->fmt.pix.pixelformat = format->fcc;
 286         fmt->fmt.pix.width = frame->wWidth;
 287         fmt->fmt.pix.height = frame->wHeight;
 288         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 289         fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(format, frame);
 290         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 291         fmt->fmt.pix.colorspace = format->colorspace;
 292
 293 done:
 294         mutex_unlock(&stream->mutex);
 295         return ret;
 296 }
 297
 298 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 299         struct v4l2_format *fmt)
 300 {
 301         struct uvc_streaming_control probe;
 302         struct uvc_format *format;
 303         struct uvc_frame *frame;
 304         int ret;
 305
 306         if (fmt->type != stream->type)
 307                 return -EINVAL;
 308
 309         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 310         if (ret < 0)
 311                 return ret;
 312
 313         mutex_lock(&stream->mutex);
 314
 315         if (uvc_queue_allocated(&stream->queue)) {
 316                 ret = -EBUSY;
 317                 goto done;
 318         }
 319
 320         stream->ctrl = probe;
 321         stream->cur_format = format;
 322         stream->cur_frame = frame;
 323
 324 done:
 325         mutex_unlock(&stream->mutex);
 326         return ret;
 327 }
 328
 329 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 330                 struct v4l2_streamparm *parm)
 331 {
 332         u32 numerator, denominator;
 333
 334         if (parm->type != stream->type)
 335                 return -EINVAL;
 336
 337         mutex_lock(&stream->mutex);
 338         numerator = stream->ctrl.dwFrameInterval;
 339         mutex_unlock(&stream->mutex);
 340
 341         denominator = 10000000;
 342         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 343
 344         memset(parm, 0, sizeof(*parm));
 345         parm->type = stream->type;
 346
 347         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 348                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 349                 parm->parm.capture.capturemode = 0;
 350                 parm->parm.capture.timeperframe.numerator = numerator;
 351                 parm->parm.capture.timeperframe.denominator = denominator;
 352                 parm->parm.capture.extendedmode = 0;
 353                 parm->parm.capture.readbuffers = 0;
 354         } else {
 355                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 356                 parm->parm.output.outputmode = 0;
 357                 parm->parm.output.timeperframe.numerator = numerator;
 358                 parm->parm.output.timeperframe.denominator = denominator;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 365                 struct v4l2_streamparm *parm)
 366 {
 367         struct uvc_streaming_control probe;
 368         struct v4l2_fract timeperframe;
 369         struct uvc_format *format;
 370         struct uvc_frame *frame;
 371         u32 interval, maxd;
 372         unsigned int i;
 373         int ret;
 374
 375         if (parm->type != stream->type)
 376                 return -EINVAL;
 377
 378         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 379                 timeperframe = parm->parm.capture.timeperframe;
 380         else
 381                 timeperframe = parm->parm.output.timeperframe;
 382
 383         interval = uvc_fraction_to_interval(timeperframe.numerator,
 384                 timeperframe.denominator);
 385         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 386                 timeperframe.numerator, timeperframe.denominator, interval);
 387
 388         mutex_lock(&stream->mutex);
 389
 390         if (uvc_queue_streaming(&stream->queue)) {
 391                 mutex_unlock(&stream->mutex);
 392                 return -EBUSY;
 393         }
 394
 395         format = stream->cur_format;
 396         frame = stream->cur_frame;
 397         probe = stream->ctrl;
 398         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 399         maxd = abs((s32)probe.dwFrameInterval - interval);
 400
 401         /* Try frames with matching size to find the best frame interval. */
 402         for (i = 0; i < format->nframes && maxd != 0; i++) {
 403                 u32 d, ival;
 404
 405                 if (&format->frame[i] == stream->cur_frame)
 406                         continue;
 407
 408                 if (format->frame[i].wWidth != stream->cur_frame->wWidth ||
 409                     format->frame[i].wHeight != stream->cur_frame->wHeight)
 410                         continue;
 411
 412                 ival = uvc_try_frame_interval(&format->frame[i], interval);
 413                 d = abs((s32)ival - interval);
 414                 if (d >= maxd)
 415                         continue;
 416
 417                 frame = &format->frame[i];
 418                 probe.bFrameIndex = frame->bFrameIndex;
 419                 probe.dwFrameInterval = ival;
 420                 maxd = d;
 421         }
 422
 423         /* Probe the device with the new settings. */
 424         ret = uvc_probe_video(stream, &probe);
 425         if (ret < 0) {
 426                 mutex_unlock(&stream->mutex);
 427                 return ret;
 428         }
 429
 430         stream->ctrl = probe;
 431         stream->cur_frame = frame;
 432         mutex_unlock(&stream->mutex);
 433
 434         /* Return the actual frame period. */
 435         timeperframe.numerator = probe.dwFrameInterval;
 436         timeperframe.denominator = 10000000;
 437         uvc_simplify_fraction(&timeperframe.numerator,
 438                 &timeperframe.denominator, 8, 333);
 439
 440         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 441                 parm->parm.capture.timeperframe = timeperframe;
 442         else
 443                 parm->parm.output.timeperframe = timeperframe;
 444
 445         return 0;
 446 }
 447
 448 /* ------------------------------------------------------------------------
 449  * Privilege management
 450  */
 451
 452 /*
 453  * Privilege management is the multiple-open implementation basis. The current
 454  * implementation is completely transparent for the end-user and doesn't
 455  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 456  * Those ioctls enable finer control on the device (by making possible for a
 457  * user to request exclusive access to a device), but are not mature yet.
 458  * Switching to the V4L2 priority mechanism might be considered in the future
 459  * if this situation changes.
 460  *
 461  * Each open instance of a UVC device can either be in a privileged or
 462  * unprivileged state. Only a single instance can be in a privileged state at
 463  * a given time. Trying to perform an operation that requires privileges will
 464  * automatically acquire the required privileges if possible, or return -EBUSY
 465  * otherwise. Privileges are dismissed when closing the instance or when
 466  * freeing the video buffers using VIDIOC_REQBUFS.
 467  *
 468  * Operations that require privileges are:
 469  *
 470  * - VIDIOC_S_INPUT
 471  * - VIDIOC_S_PARM
 472  * - VIDIOC_S_FMT
 473  * - VIDIOC_REQBUFS
 474  */
 475 static int uvc_acquire_privileges(struct uvc_fh *handle)
 476 {
 477         /* Always succeed if the handle is already privileged. */
 478         if (handle->state == UVC_HANDLE_ACTIVE)
 479                 return 0;
 480
 481         /* Check if the device already has a privileged handle. */
 482         if (atomic_inc_return(&handle->stream->active) != 1) {
 483                 atomic_dec(&handle->stream->active);
 484                 return -EBUSY;
 485         }
 486
 487         handle->state = UVC_HANDLE_ACTIVE;
 488         return 0;
 489 }
 490
 491 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 492 {
 493         if (handle->state == UVC_HANDLE_ACTIVE)
 494                 atomic_dec(&handle->stream->active);
 495
 496         handle->state = UVC_HANDLE_PASSIVE;
 497 }
 498
 499 static int uvc_has_privileges(struct uvc_fh *handle)
 500 {
 501         return handle->state == UVC_HANDLE_ACTIVE;
 502 }
 503
 504 /* ------------------------------------------------------------------------
 505  * V4L2 file operations
 506  */
 507
 508 static int uvc_v4l2_open(struct file *file)
 509 {
 510         struct uvc_streaming *stream;
 511         struct uvc_fh *handle;
 512         int ret = 0;
 513
 514         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 515         stream = video_drvdata(file);
 516
 517         ret = usb_autopm_get_interface(stream->dev->intf);
 518         if (ret < 0)
 519                 return ret;
 520
 521         /* Create the device handle. */
 522         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 523         if (handle == NULL) {
 524                 usb_autopm_put_interface(stream->dev->intf);
 525                 return -ENOMEM;
 526         }
 527
 528         mutex_lock(&stream->dev->lock);
 529         if (stream->dev->users == 0) {
 530                 ret = uvc_status_start(stream->dev, GFP_KERNEL);
 531                 if (ret < 0) {
 532                         mutex_unlock(&stream->dev->lock);
 533                         usb_autopm_put_interface(stream->dev->intf);
 534                         kfree(handle);
 535                         return ret;
 536                 }
 537         }
 538
 539         stream->dev->users++;
 540         mutex_unlock(&stream->dev->lock);
 541
 542         v4l2_fh_init(&handle->vfh, &stream->vdev);
 543         v4l2_fh_add(&handle->vfh);
 544         handle->chain = stream->chain;
 545         handle->stream = stream;
 546         handle->state = UVC_HANDLE_PASSIVE;
 547         file->private_data = handle;
 548
 549         return 0;
 550 }
 551
 552 static int uvc_v4l2_release(struct file *file)
 553 {
 554         struct uvc_fh *handle = file->private_data;
 555         struct uvc_streaming *stream = handle->stream;
 556
 557         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 558
 559         /* Only free resources if this is a privileged handle. */
 560         if (uvc_has_privileges(handle))
 561                 uvc_queue_release(&stream->queue);
 562
 563         /* Release the file handle. */
 564         uvc_dismiss_privileges(handle);
 565         v4l2_fh_del(&handle->vfh);
 566         v4l2_fh_exit(&handle->vfh);
 567         kfree(handle);
 568         file->private_data = NULL;
 569
 570         mutex_lock(&stream->dev->lock);
 571         if (--stream->dev->users == 0)
 572                 uvc_status_stop(stream->dev);
 573         mutex_unlock(&stream->dev->lock);
 574
 575         usb_autopm_put_interface(stream->dev->intf);
 576         return 0;
 577 }
 578
 579 static int uvc_ioctl_querycap(struct file *file, void *fh,
 580                               struct v4l2_capability *cap)
 581 {
 582         struct video_device *vdev = video_devdata(file);
 583         struct uvc_fh *handle = file->private_data;
 584         struct uvc_video_chain *chain = handle->chain;
 585         struct uvc_streaming *stream = handle->stream;
 586
 587         strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
 588         strscpy(cap->card, vdev->name, sizeof(cap->card));
 589         usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 590         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 591                           | chain->caps;
 592
 593         return 0;
 594 }
 595
 596 static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
 597                               struct v4l2_fmtdesc *fmt)
 598 {
 599         struct uvc_format *format;
 600         enum v4l2_buf_type type = fmt->type;
 601         u32 index = fmt->index;
 602
 603         if (fmt->type != stream->type || fmt->index >= stream->nformats)
 604                 return -EINVAL;
 605
 606         memset(fmt, 0, sizeof(*fmt));
 607         fmt->index = index;
 608         fmt->type = type;
 609
 610         format = &stream->format[fmt->index];
 611         fmt->flags = 0;
 612         if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 613                 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 614         strscpy(fmt->description, format->name, sizeof(fmt->description));
 615         fmt->description[sizeof(fmt->description) - 1] = 0;
 616         fmt->pixelformat = format->fcc;
 617         return 0;
 618 }
 619
 620 static int uvc_ioctl_enum_fmt_vid_cap(struct file *file, void *fh,
 621                                       struct v4l2_fmtdesc *fmt)
 622 {
 623         struct uvc_fh *handle = fh;
 624         struct uvc_streaming *stream = handle->stream;
 625
 626         return uvc_ioctl_enum_fmt(stream, fmt);
 627 }
 628
 629 static int uvc_ioctl_enum_fmt_vid_out(struct file *file, void *fh,
 630                                       struct v4l2_fmtdesc *fmt)
 631 {
 632         struct uvc_fh *handle = fh;
 633         struct uvc_streaming *stream = handle->stream;
 634
 635         return uvc_ioctl_enum_fmt(stream, fmt);
 636 }
 637
 638 static int uvc_ioctl_g_fmt_vid_cap(struct file *file, void *fh,
 639                                    struct v4l2_format *fmt)
 640 {
 641         struct uvc_fh *handle = fh;
 642         struct uvc_streaming *stream = handle->stream;
 643
 644         return uvc_v4l2_get_format(stream, fmt);
 645 }
 646
 647 static int uvc_ioctl_g_fmt_vid_out(struct file *file, void *fh,
 648                                    struct v4l2_format *fmt)
 649 {
 650         struct uvc_fh *handle = fh;
 651         struct uvc_streaming *stream = handle->stream;
 652
 653         return uvc_v4l2_get_format(stream, fmt);
 654 }
 655
 656 static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 657                                    struct v4l2_format *fmt)
 658 {
 659         struct uvc_fh *handle = fh;
 660         struct uvc_streaming *stream = handle->stream;
 661         int ret;
 662
 663         ret = uvc_acquire_privileges(handle);
 664         if (ret < 0)
 665                 return ret;
 666
 667         return uvc_v4l2_set_format(stream, fmt);
 668 }
 669
 670 static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 671                                    struct v4l2_format *fmt)
 672 {
 673         struct uvc_fh *handle = fh;
 674         struct uvc_streaming *stream = handle->stream;
 675         int ret;
 676
 677         ret = uvc_acquire_privileges(handle);
 678         if (ret < 0)
 679                 return ret;
 680
 681         return uvc_v4l2_set_format(stream, fmt);
 682 }
 683
 684 static int uvc_ioctl_try_fmt_vid_cap(struct file *file, void *fh,
 685                                      struct v4l2_format *fmt)
 686 {
 687         struct uvc_fh *handle = fh;
 688         struct uvc_streaming *stream = handle->stream;
 689         struct uvc_streaming_control probe;
 690
 691         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 692 }
 693
 694 static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 695                                      struct v4l2_format *fmt)
 696 {
 697         struct uvc_fh *handle = fh;
 698         struct uvc_streaming *stream = handle->stream;
 699         struct uvc_streaming_control probe;
 700
 701         return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 702 }
 703
 704 static int uvc_ioctl_reqbufs(struct file *file, void *fh,
 705                              struct v4l2_requestbuffers *rb)
 706 {
 707         struct uvc_fh *handle = fh;
 708         struct uvc_streaming *stream = handle->stream;
 709         int ret;
 710
 711         ret = uvc_acquire_privileges(handle);
 712         if (ret < 0)
 713                 return ret;
 714
 715         mutex_lock(&stream->mutex);
 716         ret = uvc_request_buffers(&stream->queue, rb);
 717         mutex_unlock(&stream->mutex);
 718         if (ret < 0)
 719                 return ret;
 720
 721         if (ret == 0)
 722                 uvc_dismiss_privileges(handle);
 723
 724         return 0;
 725 }
 726
 727 static int uvc_ioctl_querybuf(struct file *file, void *fh,
 728                               struct v4l2_buffer *buf)
 729 {
 730         struct uvc_fh *handle = fh;
 731         struct uvc_streaming *stream = handle->stream;
 732
 733         if (!uvc_has_privileges(handle))
 734                 return -EBUSY;
 735
 736         return uvc_query_buffer(&stream->queue, buf);
 737 }
 738
 739 static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 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_queue_buffer(&stream->queue,
 748                                 stream->vdev.v4l2_dev->mdev, buf);
 749 }
 750
 751 static int uvc_ioctl_expbuf(struct file *file, void *fh,
 752                             struct v4l2_exportbuffer *exp)
 753 {
 754         struct uvc_fh *handle = fh;
 755         struct uvc_streaming *stream = handle->stream;
 756
 757         if (!uvc_has_privileges(handle))
 758                 return -EBUSY;
 759
 760         return uvc_export_buffer(&stream->queue, exp);
 761 }
 762
 763 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 764 {
 765         struct uvc_fh *handle = fh;
 766         struct uvc_streaming *stream = handle->stream;
 767
 768         if (!uvc_has_privileges(handle))
 769                 return -EBUSY;
 770
 771         return uvc_dequeue_buffer(&stream->queue, buf,
 772                                   file->f_flags & O_NONBLOCK);
 773 }
 774
 775 static int uvc_ioctl_create_bufs(struct file *file, void *fh,
 776                                   struct v4l2_create_buffers *cb)
 777 {
 778         struct uvc_fh *handle = fh;
 779         struct uvc_streaming *stream = handle->stream;
 780         int ret;
 781
 782         ret = uvc_acquire_privileges(handle);
 783         if (ret < 0)
 784                 return ret;
 785
 786         return uvc_create_buffers(&stream->queue, cb);
 787 }
 788
 789 static int uvc_ioctl_streamon(struct file *file, void *fh,
 790                               enum v4l2_buf_type type)
 791 {
 792         struct uvc_fh *handle = fh;
 793         struct uvc_streaming *stream = handle->stream;
 794         int ret;
 795
 796         if (!uvc_has_privileges(handle))
 797                 return -EBUSY;
 798
 799         mutex_lock(&stream->mutex);
 800         ret = uvc_queue_streamon(&stream->queue, type);
 801         mutex_unlock(&stream->mutex);
 802
 803         return ret;
 804 }
 805
 806 static int uvc_ioctl_streamoff(struct file *file, void *fh,
 807                                enum v4l2_buf_type type)
 808 {
 809         struct uvc_fh *handle = fh;
 810         struct uvc_streaming *stream = handle->stream;
 811
 812         if (!uvc_has_privileges(handle))
 813                 return -EBUSY;
 814
 815         mutex_lock(&stream->mutex);
 816         uvc_queue_streamoff(&stream->queue, type);
 817         mutex_unlock(&stream->mutex);
 818
 819         return 0;
 820 }
 821
 822 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 823                                 struct v4l2_input *input)
 824 {
 825         struct uvc_fh *handle = fh;
 826         struct uvc_video_chain *chain = handle->chain;
 827         const struct uvc_entity *selector = chain->selector;
 828         struct uvc_entity *iterm = NULL;
 829         u32 index = input->index;
 830         int pin = 0;
 831
 832         if (selector == NULL ||
 833             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 834                 if (index != 0)
 835                         return -EINVAL;
 836                 list_for_each_entry(iterm, &chain->entities, chain) {
 837                         if (UVC_ENTITY_IS_ITERM(iterm))
 838                                 break;
 839                 }
 840                 pin = iterm->id;
 841         } else if (index < selector->bNrInPins) {
 842                 pin = selector->baSourceID[index];
 843                 list_for_each_entry(iterm, &chain->entities, chain) {
 844                         if (!UVC_ENTITY_IS_ITERM(iterm))
 845                                 continue;
 846                         if (iterm->id == pin)
 847                                 break;
 848                 }
 849         }
 850
 851         if (iterm == NULL || iterm->id != pin)
 852                 return -EINVAL;
 853
 854         memset(input, 0, sizeof(*input));
 855         input->index = index;
 856         strscpy(input->name, iterm->name, sizeof(input->name));
 857         if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 858                 input->type = V4L2_INPUT_TYPE_CAMERA;
 859
 860         return 0;
 861 }
 862
 863 static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 864 {
 865         struct uvc_fh *handle = fh;
 866         struct uvc_video_chain *chain = handle->chain;
 867         int ret;
 868         u8 i;
 869
 870         if (chain->selector == NULL ||
 871             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 872                 *input = 0;
 873                 return 0;
 874         }
 875
 876         ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
 877                              chain->dev->intfnum,  UVC_SU_INPUT_SELECT_CONTROL,
 878                              &i, 1);
 879         if (ret < 0)
 880                 return ret;
 881
 882         *input = i - 1;
 883         return 0;
 884 }
 885
 886 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 887 {
 888         struct uvc_fh *handle = fh;
 889         struct uvc_video_chain *chain = handle->chain;
 890         int ret;
 891         u32 i;
 892
 893         ret = uvc_acquire_privileges(handle);
 894         if (ret < 0)
 895                 return ret;
 896
 897         if (chain->selector == NULL ||
 898             (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 899                 if (input)
 900                         return -EINVAL;
 901                 return 0;
 902         }
 903
 904         if (input >= chain->selector->bNrInPins)
 905                 return -EINVAL;
 906
 907         i = input + 1;
 908         return uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
 909                               chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
 910                               &i, 1);
 911 }
 912
 913 static int uvc_ioctl_queryctrl(struct file *file, void *fh,
 914                                struct v4l2_queryctrl *qc)
 915 {
 916         struct uvc_fh *handle = fh;
 917         struct uvc_video_chain *chain = handle->chain;
 918
 919         return uvc_query_v4l2_ctrl(chain, qc);
 920 }
 921
 922 static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
 923                                     struct v4l2_query_ext_ctrl *qec)
 924 {
 925         struct uvc_fh *handle = fh;
 926         struct uvc_video_chain *chain = handle->chain;
 927         struct v4l2_queryctrl qc = { qec->id };
 928         int ret;
 929
 930         ret = uvc_query_v4l2_ctrl(chain, &qc);
 931         if (ret)
 932                 return ret;
 933
 934         qec->id = qc.id;
 935         qec->type = qc.type;
 936         strscpy(qec->name, qc.name, sizeof(qec->name));
 937         qec->minimum = qc.minimum;
 938         qec->maximum = qc.maximum;
 939         qec->step = qc.step;
 940         qec->default_value = qc.default_value;
 941         qec->flags = qc.flags;
 942         qec->elem_size = 4;
 943         qec->elems = 1;
 944         qec->nr_of_dims = 0;
 945         memset(qec->dims, 0, sizeof(qec->dims));
 946         memset(qec->reserved, 0, sizeof(qec->reserved));
 947
 948         return 0;
 949 }
 950
 951 static int uvc_ioctl_g_ctrl(struct file *file, void *fh,
 952                             struct v4l2_control *ctrl)
 953 {
 954         struct uvc_fh *handle = fh;
 955         struct uvc_video_chain *chain = handle->chain;
 956         struct v4l2_ext_control xctrl;
 957         int ret;
 958
 959         memset(&xctrl, 0, sizeof(xctrl));
 960         xctrl.id = ctrl->id;
 961
 962         ret = uvc_ctrl_begin(chain);
 963         if (ret < 0)
 964                 return ret;
 965
 966         ret = uvc_ctrl_get(chain, &xctrl);
 967         uvc_ctrl_rollback(handle);
 968         if (ret < 0)
 969                 return ret;
 970
 971         ctrl->value = xctrl.value;
 972         return 0;
 973 }
 974
 975 static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 976                             struct v4l2_control *ctrl)
 977 {
 978         struct uvc_fh *handle = fh;
 979         struct uvc_video_chain *chain = handle->chain;
 980         struct v4l2_ext_control xctrl;
 981         int ret;
 982
 983         memset(&xctrl, 0, sizeof(xctrl));
 984         xctrl.id = ctrl->id;
 985         xctrl.value = ctrl->value;
 986
 987         ret = uvc_ctrl_begin(chain);
 988         if (ret < 0)
 989                 return ret;
 990
 991         ret = uvc_ctrl_set(handle, &xctrl);
 992         if (ret < 0) {
 993                 uvc_ctrl_rollback(handle);
 994                 return ret;
 995         }
 996
 997         ret = uvc_ctrl_commit(handle, &xctrl, 1);
 998         if (ret < 0)
 999                 return ret;
1000
1001         ctrl->value = xctrl.value;
1002         return 0;
1003 }
1004
1005 static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
1006                                  struct v4l2_ext_controls *ctrls)
1007 {
1008         struct uvc_fh *handle = fh;
1009         struct uvc_video_chain *chain = handle->chain;
1010         struct v4l2_ext_control *ctrl = ctrls->controls;
1011         unsigned int i;
1012         int ret;
1013
1014         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
1015                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1016                         struct v4l2_queryctrl qc = { .id = ctrl->id };
1017
1018                         ret = uvc_query_v4l2_ctrl(chain, &qc);
1019                         if (ret < 0) {
1020                                 ctrls->error_idx = i;
1021                                 return ret;
1022                         }
1023
1024                         ctrl->value = qc.default_value;
1025                 }
1026
1027                 return 0;
1028         }
1029
1030         ret = uvc_ctrl_begin(chain);
1031         if (ret < 0)
1032                 return ret;
1033
1034         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1035                 ret = uvc_ctrl_get(chain, ctrl);
1036                 if (ret < 0) {
1037                         uvc_ctrl_rollback(handle);
1038                         ctrls->error_idx = i;
1039                         return ret;
1040                 }
1041         }
1042
1043         ctrls->error_idx = 0;
1044
1045         return uvc_ctrl_rollback(handle);
1046 }
1047
1048 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
1049                                      struct v4l2_ext_controls *ctrls,
1050                                      bool commit)
1051 {
1052         struct v4l2_ext_control *ctrl = ctrls->controls;
1053         struct uvc_video_chain *chain = handle->chain;
1054         unsigned int i;
1055         int ret;
1056
1057         /* Default value cannot be changed */
1058         if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
1059                 return -EINVAL;
1060
1061         ret = uvc_ctrl_begin(chain);
1062         if (ret < 0)
1063                 return ret;
1064
1065         for (i = 0; i < ctrls->count; ++ctrl, ++i) {
1066                 ret = uvc_ctrl_set(handle, ctrl);
1067                 if (ret < 0) {
1068                         uvc_ctrl_rollback(handle);
1069                         ctrls->error_idx = commit ? ctrls->count : i;
1070                         return ret;
1071                 }
1072         }
1073
1074         ctrls->error_idx = 0;
1075
1076         if (commit)
1077                 return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
1078         else
1079                 return uvc_ctrl_rollback(handle);
1080 }
1081
1082 static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
1083                                  struct v4l2_ext_controls *ctrls)
1084 {
1085         struct uvc_fh *handle = fh;
1086
1087         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
1088 }
1089
1090 static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
1091                                    struct v4l2_ext_controls *ctrls)
1092 {
1093         struct uvc_fh *handle = fh;
1094
1095         return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
1096 }
1097
1098 static int uvc_ioctl_querymenu(struct file *file, void *fh,
1099                                struct v4l2_querymenu *qm)
1100 {
1101         struct uvc_fh *handle = fh;
1102         struct uvc_video_chain *chain = handle->chain;
1103
1104         return uvc_query_v4l2_menu(chain, qm);
1105 }
1106
1107 static int uvc_ioctl_g_selection(struct file *file, void *fh,
1108                                  struct v4l2_selection *sel)
1109 {
1110         struct uvc_fh *handle = fh;
1111         struct uvc_streaming *stream = handle->stream;
1112
1113         if (sel->type != stream->type)
1114                 return -EINVAL;
1115
1116         switch (sel->target) {
1117         case V4L2_SEL_TGT_CROP_DEFAULT:
1118         case V4L2_SEL_TGT_CROP_BOUNDS:
1119                 if (stream->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1120                         return -EINVAL;
1121                 break;
1122         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
1123         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
1124                 if (stream->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1125                         return -EINVAL;
1126                 break;
1127         default:
1128                 return -EINVAL;
1129         }
1130
1131         sel->r.left = 0;
1132         sel->r.top = 0;
1133         mutex_lock(&stream->mutex);
1134         sel->r.width = stream->cur_frame->wWidth;
1135         sel->r.height = stream->cur_frame->wHeight;
1136         mutex_unlock(&stream->mutex);
1137
1138         return 0;
1139 }
1140
1141 static int uvc_ioctl_g_parm(struct file *file, void *fh,
1142                             struct v4l2_streamparm *parm)
1143 {
1144         struct uvc_fh *handle = fh;
1145         struct uvc_streaming *stream = handle->stream;
1146
1147         return uvc_v4l2_get_streamparm(stream, parm);
1148 }
1149
1150 static int uvc_ioctl_s_parm(struct file *file, void *fh,
1151                             struct v4l2_streamparm *parm)
1152 {
1153         struct uvc_fh *handle = fh;
1154         struct uvc_streaming *stream = handle->stream;
1155         int ret;
1156
1157         ret = uvc_acquire_privileges(handle);
1158         if (ret < 0)
1159                 return ret;
1160
1161         return uvc_v4l2_set_streamparm(stream, parm);
1162 }
1163
1164 static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
1165                                      struct v4l2_frmsizeenum *fsize)
1166 {
1167         struct uvc_fh *handle = fh;
1168         struct uvc_streaming *stream = handle->stream;
1169         struct uvc_format *format = NULL;
1170         struct uvc_frame *frame = NULL;
1171         unsigned int index;
1172         unsigned int i;
1173
1174         /* Look for the given pixel format */
1175         for (i = 0; i < stream->nformats; i++) {
1176                 if (stream->format[i].fcc == fsize->pixel_format) {
1177                         format = &stream->format[i];
1178                         break;
1179                 }
1180         }
1181         if (format == NULL)
1182                 return -EINVAL;
1183
1184         /* Skip duplicate frame sizes */
1185         for (i = 0, index = 0; i < format->nframes; i++) {
1186                 if (frame && frame->wWidth == format->frame[i].wWidth &&
1187                     frame->wHeight == format->frame[i].wHeight)
1188                         continue;
1189                 frame = &format->frame[i];
1190                 if (index == fsize->index)
1191                         break;
1192                 index++;
1193         }
1194
1195         if (i == format->nframes)
1196                 return -EINVAL;
1197
1198         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1199         fsize->discrete.width = frame->wWidth;
1200         fsize->discrete.height = frame->wHeight;
1201         return 0;
1202 }
1203
1204 static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
1205                                          struct v4l2_frmivalenum *fival)
1206 {
1207         struct uvc_fh *handle = fh;
1208         struct uvc_streaming *stream = handle->stream;
1209         struct uvc_format *format = NULL;
1210         struct uvc_frame *frame = NULL;
1211         unsigned int nintervals;
1212         unsigned int index;
1213         unsigned int i;
1214
1215         /* Look for the given pixel format and frame size */
1216         for (i = 0; i < stream->nformats; i++) {
1217                 if (stream->format[i].fcc == fival->pixel_format) {
1218                         format = &stream->format[i];
1219                         break;
1220                 }
1221         }
1222         if (format == NULL)
1223                 return -EINVAL;
1224
1225         index = fival->index;
1226         for (i = 0; i < format->nframes; i++) {
1227                 if (format->frame[i].wWidth == fival->width &&
1228                     format->frame[i].wHeight == fival->height) {
1229                         frame = &format->frame[i];
1230                         nintervals = frame->bFrameIntervalType ?: 1;
1231                         if (index < nintervals)
1232                                 break;
1233                         index -= nintervals;
1234                 }
1235         }
1236         if (i == format->nframes)
1237                 return -EINVAL;
1238
1239         if (frame->bFrameIntervalType) {
1240                 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1241                 fival->discrete.numerator =
1242                         frame->dwFrameInterval[index];
1243                 fival->discrete.denominator = 10000000;
1244                 uvc_simplify_fraction(&fival->discrete.numerator,
1245                         &fival->discrete.denominator, 8, 333);
1246         } else {
1247                 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
1248                 fival->stepwise.min.numerator = frame->dwFrameInterval[0];
1249                 fival->stepwise.min.denominator = 10000000;
1250                 fival->stepwise.max.numerator = frame->dwFrameInterval[1];
1251                 fival->stepwise.max.denominator = 10000000;
1252                 fival->stepwise.step.numerator = frame->dwFrameInterval[2];
1253                 fival->stepwise.step.denominator = 10000000;
1254                 uvc_simplify_fraction(&fival->stepwise.min.numerator,
1255                         &fival->stepwise.min.denominator, 8, 333);
1256                 uvc_simplify_fraction(&fival->stepwise.max.numerator,
1257                         &fival->stepwise.max.denominator, 8, 333);
1258                 uvc_simplify_fraction(&fival->stepwise.step.numerator,
1259                         &fival->stepwise.step.denominator, 8, 333);
1260         }
1261
1262         return 0;
1263 }
1264
1265 static int uvc_ioctl_subscribe_event(struct v4l2_fh *fh,
1266                                      const struct v4l2_event_subscription *sub)
1267 {
1268         switch (sub->type) {
1269         case V4L2_EVENT_CTRL:
1270                 return v4l2_event_subscribe(fh, sub, 0, &uvc_ctrl_sub_ev_ops);
1271         default:
1272                 return -EINVAL;
1273         }
1274 }
1275
1276 static long uvc_ioctl_default(struct file *file, void *fh, bool valid_prio,
1277                               unsigned int cmd, void *arg)
1278 {
1279         struct uvc_fh *handle = fh;
1280         struct uvc_video_chain *chain = handle->chain;
1281
1282         switch (cmd) {
1283         /* Dynamic controls. */
1284         case UVCIOC_CTRL_MAP:
1285                 return uvc_ioctl_ctrl_map(chain, arg);
1286
1287         case UVCIOC_CTRL_QUERY:
1288                 return uvc_xu_ctrl_query(chain, arg);
1289
1290         default:
1291                 return -ENOTTY;
1292         }
1293 }
1294
1295 #ifdef CONFIG_COMPAT
1296 struct uvc_xu_control_mapping32 {
1297         u32 id;
1298         u8 name[32];
1299         u8 entity[16];
1300         u8 selector;
1301
1302         u8 size;
1303         u8 offset;
1304         u32 v4l2_type;
1305         u32 data_type;
1306
1307         compat_caddr_t menu_info;
1308         u32 menu_count;
1309
1310         u32 reserved[4];
1311 };
1312
1313 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1314                         const struct uvc_xu_control_mapping32 __user *up)
1315 {
1316         struct uvc_xu_control_mapping32 *p = (void *)kp;
1317         compat_caddr_t info;
1318         u32 count;
1319
1320         if (copy_from_user(p, up, sizeof(*p)))
1321                 return -EFAULT;
1322
1323         count = p->menu_count;
1324         info = p->menu_info;
1325
1326         memset(kp->reserved, 0, sizeof(kp->reserved));
1327         kp->menu_info = count ? compat_ptr(info) : NULL;
1328         kp->menu_count = count;
1329         return 0;
1330 }
1331
1332 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1333                         struct uvc_xu_control_mapping32 __user *up)
1334 {
1335         if (copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1336             put_user(kp->menu_count, &up->menu_count))
1337                 return -EFAULT;
1338
1339         if (clear_user(up->reserved, sizeof(up->reserved)))
1340                 return -EFAULT;
1341
1342         return 0;
1343 }
1344
1345 struct uvc_xu_control_query32 {
1346         u8 unit;
1347         u8 selector;
1348         u8 query;
1349         u16 size;
1350         compat_caddr_t data;
1351 };
1352
1353 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1354                         const struct uvc_xu_control_query32 __user *up)
1355 {
1356         struct uvc_xu_control_query32 v;
1357
1358         if (copy_from_user(&v, up, sizeof(v)))
1359                 return -EFAULT;
1360
1361         *kp = (struct uvc_xu_control_query){
1362                 .unit = v.unit,
1363                 .selector = v.selector,
1364                 .query = v.query,
1365                 .size = v.size,
1366                 .data = v.size ? compat_ptr(v.data) : NULL
1367         };
1368         return 0;
1369 }
1370
1371 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1372                         struct uvc_xu_control_query32 __user *up)
1373 {
1374         if (copy_to_user(up, kp, offsetof(typeof(*up), data)))
1375                 return -EFAULT;
1376         return 0;
1377 }
1378
1379 #define UVCIOC_CTRL_MAP32       _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1380 #define UVCIOC_CTRL_QUERY32     _IOWR('u', 0x21, struct uvc_xu_control_query32)
1381
1382 static long uvc_v4l2_compat_ioctl32(struct file *file,
1383                      unsigned int cmd, unsigned long arg)
1384 {
1385         struct uvc_fh *handle = file->private_data;
1386         union {
1387                 struct uvc_xu_control_mapping xmap;
1388                 struct uvc_xu_control_query xqry;
1389         } karg;
1390         void __user *up = compat_ptr(arg);
1391         long ret;
1392
1393         switch (cmd) {
1394         case UVCIOC_CTRL_MAP32:
1395                 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1396                 if (ret)
1397                         return ret;
1398                 ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);
1399                 if (ret)
1400                         return ret;
1401                 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1402                 if (ret)
1403                         return ret;
1404
1405                 break;
1406
1407         case UVCIOC_CTRL_QUERY32:
1408                 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1409                 if (ret)
1410                         return ret;
1411                 ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);
1412                 if (ret)
1413                         return ret;
1414                 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1415                 if (ret)
1416                         return ret;
1417                 break;
1418
1419         default:
1420                 return -ENOIOCTLCMD;
1421         }
1422
1423         return ret;
1424 }
1425 #endif
1426
1427 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1428                     size_t count, loff_t *ppos)
1429 {
1430         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1431         return -EINVAL;
1432 }
1433
1434 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1435 {
1436         struct uvc_fh *handle = file->private_data;
1437         struct uvc_streaming *stream = handle->stream;
1438
1439         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1440
1441         return uvc_queue_mmap(&stream->queue, vma);
1442 }
1443
1444 static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
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_poll\n");
1450
1451         return uvc_queue_poll(&stream->queue, file, wait);
1452 }
1453
1454 #ifndef CONFIG_MMU
1455 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1456                 unsigned long addr, unsigned long len, unsigned long pgoff,
1457                 unsigned long flags)
1458 {
1459         struct uvc_fh *handle = file->private_data;
1460         struct uvc_streaming *stream = handle->stream;
1461
1462         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1463
1464         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1465 }
1466 #endif
1467
1468 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
1469         .vidioc_querycap = uvc_ioctl_querycap,
1470         .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
1471         .vidioc_enum_fmt_vid_out = uvc_ioctl_enum_fmt_vid_out,
1472         .vidioc_g_fmt_vid_cap = uvc_ioctl_g_fmt_vid_cap,
1473         .vidioc_g_fmt_vid_out = uvc_ioctl_g_fmt_vid_out,
1474         .vidioc_s_fmt_vid_cap = uvc_ioctl_s_fmt_vid_cap,
1475         .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
1476         .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
1477         .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
1478         .vidioc_reqbufs = uvc_ioctl_reqbufs,
1479         .vidioc_querybuf = uvc_ioctl_querybuf,
1480         .vidioc_qbuf = uvc_ioctl_qbuf,
1481         .vidioc_expbuf = uvc_ioctl_expbuf,
1482         .vidioc_dqbuf = uvc_ioctl_dqbuf,
1483         .vidioc_create_bufs = uvc_ioctl_create_bufs,
1484         .vidioc_streamon = uvc_ioctl_streamon,
1485         .vidioc_streamoff = uvc_ioctl_streamoff,
1486         .vidioc_enum_input = uvc_ioctl_enum_input,
1487         .vidioc_g_input = uvc_ioctl_g_input,
1488         .vidioc_s_input = uvc_ioctl_s_input,
1489         .vidioc_queryctrl = uvc_ioctl_queryctrl,
1490         .vidioc_query_ext_ctrl = uvc_ioctl_query_ext_ctrl,
1491         .vidioc_g_ctrl = uvc_ioctl_g_ctrl,
1492         .vidioc_s_ctrl = uvc_ioctl_s_ctrl,
1493         .vidioc_g_ext_ctrls = uvc_ioctl_g_ext_ctrls,
1494         .vidioc_s_ext_ctrls = uvc_ioctl_s_ext_ctrls,
1495         .vidioc_try_ext_ctrls = uvc_ioctl_try_ext_ctrls,
1496         .vidioc_querymenu = uvc_ioctl_querymenu,
1497         .vidioc_g_selection = uvc_ioctl_g_selection,
1498         .vidioc_g_parm = uvc_ioctl_g_parm,
1499         .vidioc_s_parm = uvc_ioctl_s_parm,
1500         .vidioc_enum_framesizes = uvc_ioctl_enum_framesizes,
1501         .vidioc_enum_frameintervals = uvc_ioctl_enum_frameintervals,
1502         .vidioc_subscribe_event = uvc_ioctl_subscribe_event,
1503         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1504         .vidioc_default = uvc_ioctl_default,
1505 };
1506
1507 const struct v4l2_file_operations uvc_fops = {
1508         .owner          = THIS_MODULE,
1509         .open           = uvc_v4l2_open,
1510         .release        = uvc_v4l2_release,
1511         .unlocked_ioctl = video_ioctl2,
1512 #ifdef CONFIG_COMPAT
1513         .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1514 #endif
1515         .read           = uvc_v4l2_read,
1516         .mmap           = uvc_v4l2_mmap,
1517         .poll           = uvc_v4l2_poll,
1518 #ifndef CONFIG_MMU
1519         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1520 #endif
1521 };
1522