SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/media/video/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2009
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   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/kernel.h>
  15 #include <linux/version.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 <asm/atomic.h>
  25
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-ioctl.h>
  28
  29 #include "uvcvideo.h"
  30
  31 /* ------------------------------------------------------------------------
  32  * V4L2 interface
  33  */
  34
  35 /*
  36  * Mapping V4L2 controls to UVC controls can be straighforward if done well.
  37  * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
  38  * must be grouped (for instance the Red Balance, Blue Balance and Do White
  39  * Balance V4L2 controls use the White Balance Component UVC control) or
  40  * otherwise translated. The approach we take here is to use a translation
  41  * table for the controls that can be mapped directly, and handle the others
  42  * manually.
  43  */
  44 static int uvc_v4l2_query_menu(struct uvc_video_chain *chain,
  45         struct v4l2_querymenu *query_menu)
  46 {
  47         struct uvc_menu_info *menu_info;
  48         struct uvc_control_mapping *mapping;
  49         struct uvc_control *ctrl;
  50         u32 index = query_menu->index;
  51         u32 id = query_menu->id;
  52
  53         ctrl = uvc_find_control(chain, query_menu->id, &mapping);
  54         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
  55                 return -EINVAL;
  56
  57         if (query_menu->index >= mapping->menu_count)
  58                 return -EINVAL;
  59
  60         memset(query_menu, 0, sizeof(*query_menu));
  61         query_menu->id = id;
  62         query_menu->index = index;
  63
  64         menu_info = &mapping->menu_info[query_menu->index];
  65         strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
  66         return 0;
  67 }
  68
  69 /*
  70  * Find the frame interval closest to the requested frame interval for the
  71  * given frame format and size. This should be done by the device as part of
  72  * the Video Probe and Commit negotiation, but some hardware don't implement
  73  * that feature.
  74  */
  75 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
  76 {
  77         unsigned int i;
  78
  79         if (frame->bFrameIntervalType) {
  80                 __u32 best = -1, dist;
  81
  82                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
  83                         dist = interval > frame->dwFrameInterval[i]
  84                              ? interval - frame->dwFrameInterval[i]
  85                              : frame->dwFrameInterval[i] - interval;
  86
  87                         if (dist > best)
  88                                 break;
  89
  90                         best = dist;
  91                 }
  92
  93                 interval = frame->dwFrameInterval[i-1];
  94         } else {
  95                 const __u32 min = frame->dwFrameInterval[0];
  96                 const __u32 max = frame->dwFrameInterval[1];
  97                 const __u32 step = frame->dwFrameInterval[2];
  98
  99                 interval = min + (interval - min + step/2) / step * step;
 100                 if (interval > max)
 101                         interval = max;
 102         }
 103
 104         return interval;
 105 }
 106
 107 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 108         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 109         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 110 {
 111         struct uvc_format *format = NULL;
 112         struct uvc_frame *frame = NULL;
 113         __u16 rw, rh;
 114         unsigned int d, maxd;
 115         unsigned int i;
 116         __u32 interval;
 117         int ret = 0;
 118         __u8 *fcc;
 119
 120         if (fmt->type != stream->type)
 121                 return -EINVAL;
 122
 123         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 124         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 125                         fmt->fmt.pix.pixelformat,
 126                         fcc[0], fcc[1], fcc[2], fcc[3],
 127                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 128
 129         /* Check if the hardware supports the requested format. */
 130         for (i = 0; i < stream->nformats; ++i) {
 131                 format = &stream->format[i];
 132                 if (format->fcc == fmt->fmt.pix.pixelformat)
 133                         break;
 134         }
 135
 136         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
 137                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
 138                                 fmt->fmt.pix.pixelformat);
 139                 return -EINVAL;
 140         }
 141
 142         /* Find the closest image size. The distance between image sizes is
 143          * the size in pixels of the non-overlapping regions between the
 144          * requested size and the frame-specified size.
 145          */
 146         rw = fmt->fmt.pix.width;
 147         rh = fmt->fmt.pix.height;
 148         maxd = (unsigned int)-1;
 149
 150         for (i = 0; i < format->nframes; ++i) {
 151                 __u16 w = format->frame[i].wWidth;
 152                 __u16 h = format->frame[i].wHeight;
 153
 154                 d = min(w, rw) * min(h, rh);
 155                 d = w*h + rw*rh - 2*d;
 156                 if (d < maxd) {
 157                         maxd = d;
 158                         frame = &format->frame[i];
 159                 }
 160
 161                 if (maxd == 0)
 162                         break;
 163         }
 164
 165         if (frame == NULL) {
 166                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 167                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 168                 return -EINVAL;
 169         }
 170
 171         /* Use the default frame interval. */
 172         interval = frame->dwDefaultFrameInterval;
 173         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 174                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 175                 (100000000/interval)%10);
 176
 177         /* Set the format index, frame index and frame interval. */
 178         memset(probe, 0, sizeof *probe);
 179         probe->bmHint = 1;      /* dwFrameInterval */
 180         probe->bFormatIndex = format->index;
 181         probe->bFrameIndex = frame->bFrameIndex;
 182         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 183         /* Some webcams stall the probe control set request when the
 184          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 185          * clearly states that the field is read-only from the host, so this
 186          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 187          * the webcam to work around the problem.
 188          *
 189          * The workaround could probably be enabled for all webcams, so the
 190          * quirk can be removed if needed. It's currently useful to detect
 191          * webcam bugs and fix them before they hit the market (providing
 192          * developers test their webcams with the Linux driver as well as with
 193          * the Windows driver).
 194          */
 195         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 196                 probe->dwMaxVideoFrameSize =
 197                         stream->ctrl.dwMaxVideoFrameSize;
 198
 199         /* Probe the device. */
 200         ret = uvc_probe_video(stream, probe);
 201         if (ret < 0)
 202                 goto done;
 203
 204         fmt->fmt.pix.width = frame->wWidth;
 205         fmt->fmt.pix.height = frame->wHeight;
 206         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 207         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 208         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 209         fmt->fmt.pix.colorspace = format->colorspace;
 210         fmt->fmt.pix.priv = 0;
 211
 212         if (uvc_format != NULL)
 213                 *uvc_format = format;
 214         if (uvc_frame != NULL)
 215                 *uvc_frame = frame;
 216
 217 done:
 218         return ret;
 219 }
 220
 221 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 222         struct v4l2_format *fmt)
 223 {
 224         struct uvc_format *format = stream->cur_format;
 225         struct uvc_frame *frame = stream->cur_frame;
 226
 227         if (fmt->type != stream->type)
 228                 return -EINVAL;
 229
 230         if (format == NULL || frame == NULL)
 231                 return -EINVAL;
 232
 233         fmt->fmt.pix.pixelformat = format->fcc;
 234         fmt->fmt.pix.width = frame->wWidth;
 235         fmt->fmt.pix.height = frame->wHeight;
 236         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 237         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 238         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 239         fmt->fmt.pix.colorspace = format->colorspace;
 240         fmt->fmt.pix.priv = 0;
 241
 242         return 0;
 243 }
 244
 245 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 246         struct v4l2_format *fmt)
 247 {
 248         struct uvc_streaming_control probe;
 249         struct uvc_format *format;
 250         struct uvc_frame *frame;
 251         int ret;
 252
 253         if (fmt->type != stream->type)
 254                 return -EINVAL;
 255
 256         if (uvc_queue_allocated(&stream->queue))
 257                 return -EBUSY;
 258
 259         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 260         if (ret < 0)
 261                 return ret;
 262
 263         memcpy(&stream->ctrl, &probe, sizeof probe);
 264         stream->cur_format = format;
 265         stream->cur_frame = frame;
 266
 267         return 0;
 268 }
 269
 270 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 271                 struct v4l2_streamparm *parm)
 272 {
 273         uint32_t numerator, denominator;
 274
 275         if (parm->type != stream->type)
 276                 return -EINVAL;
 277
 278         numerator = stream->ctrl.dwFrameInterval;
 279         denominator = 10000000;
 280         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 281
 282         memset(parm, 0, sizeof *parm);
 283         parm->type = stream->type;
 284
 285         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 286                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 287                 parm->parm.capture.capturemode = 0;
 288                 parm->parm.capture.timeperframe.numerator = numerator;
 289                 parm->parm.capture.timeperframe.denominator = denominator;
 290                 parm->parm.capture.extendedmode = 0;
 291                 parm->parm.capture.readbuffers = 0;
 292         } else {
 293                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 294                 parm->parm.output.outputmode = 0;
 295                 parm->parm.output.timeperframe.numerator = numerator;
 296                 parm->parm.output.timeperframe.denominator = denominator;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 303                 struct v4l2_streamparm *parm)
 304 {
 305         struct uvc_frame *frame = stream->cur_frame;
 306         struct uvc_streaming_control probe;
 307         struct v4l2_fract timeperframe;
 308         uint32_t interval;
 309         int ret;
 310
 311         if (parm->type != stream->type)
 312                 return -EINVAL;
 313
 314         if (uvc_queue_streaming(&stream->queue))
 315                 return -EBUSY;
 316
 317         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 318                 timeperframe = parm->parm.capture.timeperframe;
 319         else
 320                 timeperframe = parm->parm.output.timeperframe;
 321
 322         memcpy(&probe, &stream->ctrl, sizeof probe);
 323         interval = uvc_fraction_to_interval(timeperframe.numerator,
 324                 timeperframe.denominator);
 325
 326         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 327                 timeperframe.numerator, timeperframe.denominator, interval);
 328         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 329
 330         /* Probe the device with the new settings. */
 331         ret = uvc_probe_video(stream, &probe);
 332         if (ret < 0)
 333                 return ret;
 334
 335         memcpy(&stream->ctrl, &probe, sizeof probe);
 336
 337         /* Return the actual frame period. */
 338         timeperframe.numerator = probe.dwFrameInterval;
 339         timeperframe.denominator = 10000000;
 340         uvc_simplify_fraction(&timeperframe.numerator,
 341                 &timeperframe.denominator, 8, 333);
 342
 343         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 344                 parm->parm.capture.timeperframe = timeperframe;
 345         else
 346                 parm->parm.output.timeperframe = timeperframe;
 347
 348         return 0;
 349 }
 350
 351 /* ------------------------------------------------------------------------
 352  * Privilege management
 353  */
 354
 355 /*
 356  * Privilege management is the multiple-open implementation basis. The current
 357  * implementation is completely transparent for the end-user and doesn't
 358  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 359  * Those ioctls enable finer control on the device (by making possible for a
 360  * user to request exclusive access to a device), but are not mature yet.
 361  * Switching to the V4L2 priority mechanism might be considered in the future
 362  * if this situation changes.
 363  *
 364  * Each open instance of a UVC device can either be in a privileged or
 365  * unprivileged state. Only a single instance can be in a privileged state at
 366  * a given time. Trying to perform an operation that requires privileges will
 367  * automatically acquire the required privileges if possible, or return -EBUSY
 368  * otherwise. Privileges are dismissed when closing the instance or when
 369  * freeing the video buffers using VIDIOC_REQBUFS.
 370  *
 371  * Operations that require privileges are:
 372  *
 373  * - VIDIOC_S_INPUT
 374  * - VIDIOC_S_PARM
 375  * - VIDIOC_S_FMT
 376  * - VIDIOC_REQBUFS
 377  */
 378 static int uvc_acquire_privileges(struct uvc_fh *handle)
 379 {
 380         /* Always succeed if the handle is already privileged. */
 381         if (handle->state == UVC_HANDLE_ACTIVE)
 382                 return 0;
 383
 384         /* Check if the device already has a privileged handle. */
 385         if (atomic_inc_return(&handle->stream->active) != 1) {
 386                 atomic_dec(&handle->stream->active);
 387                 return -EBUSY;
 388         }
 389
 390         handle->state = UVC_HANDLE_ACTIVE;
 391         return 0;
 392 }
 393
 394 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 395 {
 396         if (handle->state == UVC_HANDLE_ACTIVE)
 397                 atomic_dec(&handle->stream->active);
 398
 399         handle->state = UVC_HANDLE_PASSIVE;
 400 }
 401
 402 static int uvc_has_privileges(struct uvc_fh *handle)
 403 {
 404         return handle->state == UVC_HANDLE_ACTIVE;
 405 }
 406
 407 /* ------------------------------------------------------------------------
 408  * V4L2 file operations
 409  */
 410
 411 static int uvc_v4l2_open(struct file *file)
 412 {
 413         struct uvc_streaming *stream;
 414         struct uvc_fh *handle;
 415         int ret = 0;
 416
 417         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 418         stream = video_drvdata(file);
 419
 420         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 421                 return -ENODEV;
 422
 423         ret = usb_autopm_get_interface(stream->dev->intf);
 424         if (ret < 0)
 425                 return ret;
 426
 427         /* Create the device handle. */
 428         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 429         if (handle == NULL) {
 430                 usb_autopm_put_interface(stream->dev->intf);
 431                 return -ENOMEM;
 432         }
 433
 434         if (atomic_inc_return(&stream->dev->users) == 1) {
 435                 ret = uvc_status_start(stream->dev);
 436                 if (ret < 0) {
 437                         usb_autopm_put_interface(stream->dev->intf);
 438                         atomic_dec(&stream->dev->users);
 439                         kfree(handle);
 440                         return ret;
 441                 }
 442         }
 443
 444         handle->chain = stream->chain;
 445         handle->stream = stream;
 446         handle->state = UVC_HANDLE_PASSIVE;
 447         file->private_data = handle;
 448
 449         return 0;
 450 }
 451
 452 static int uvc_v4l2_release(struct file *file)
 453 {
 454         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 455         struct uvc_streaming *stream = handle->stream;
 456
 457         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 458
 459         /* Only free resources if this is a privileged handle. */
 460         if (uvc_has_privileges(handle)) {
 461                 uvc_video_enable(stream, 0);
 462
 463                 mutex_lock(&stream->queue.mutex);
 464                 if (uvc_free_buffers(&stream->queue) < 0)
 465                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 466                                         "free buffers.\n");
 467                 mutex_unlock(&stream->queue.mutex);
 468         }
 469
 470         /* Release the file handle. */
 471         uvc_dismiss_privileges(handle);
 472         kfree(handle);
 473         file->private_data = NULL;
 474
 475         if (atomic_dec_return(&stream->dev->users) == 0)
 476                 uvc_status_stop(stream->dev);
 477
 478         usb_autopm_put_interface(stream->dev->intf);
 479         return 0;
 480 }
 481
 482 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 483 {
 484         struct video_device *vdev = video_devdata(file);
 485         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 486         struct uvc_video_chain *chain = handle->chain;
 487         struct uvc_streaming *stream = handle->stream;
 488         long ret = 0;
 489
 490         switch (cmd) {
 491         /* Query capabilities */
 492         case VIDIOC_QUERYCAP:
 493         {
 494                 struct v4l2_capability *cap = arg;
 495
 496                 memset(cap, 0, sizeof *cap);
 497                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 498                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 499                 usb_make_path(stream->dev->udev,
 500                               cap->bus_info, sizeof(cap->bus_info));
 501                 cap->version = DRIVER_VERSION_NUMBER;
 502                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 503                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 504                                           | V4L2_CAP_STREAMING;
 505                 else
 506                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
 507                                           | V4L2_CAP_STREAMING;
 508                 break;
 509         }
 510
 511         /* Get, Set & Query control */
 512         case VIDIOC_QUERYCTRL:
 513                 return uvc_query_v4l2_ctrl(chain, arg);
 514
 515         case VIDIOC_G_CTRL:
 516         {
 517                 struct v4l2_control *ctrl = arg;
 518                 struct v4l2_ext_control xctrl;
 519
 520                 memset(&xctrl, 0, sizeof xctrl);
 521                 xctrl.id = ctrl->id;
 522
 523                 ret = uvc_ctrl_begin(chain);
 524                 if (ret < 0)
 525                         return ret;
 526
 527                 ret = uvc_ctrl_get(chain, &xctrl);
 528                 uvc_ctrl_rollback(chain);
 529                 if (ret >= 0)
 530                         ctrl->value = xctrl.value;
 531                 break;
 532         }
 533
 534         case VIDIOC_S_CTRL:
 535         {
 536                 struct v4l2_control *ctrl = arg;
 537                 struct v4l2_ext_control xctrl;
 538
 539                 memset(&xctrl, 0, sizeof xctrl);
 540                 xctrl.id = ctrl->id;
 541                 xctrl.value = ctrl->value;
 542
 543                 ret = uvc_ctrl_begin(chain);
 544                 if (ret < 0)
 545                         return ret;
 546
 547                 ret = uvc_ctrl_set(chain, &xctrl);
 548                 if (ret < 0) {
 549                         uvc_ctrl_rollback(chain);
 550                         return ret;
 551                 }
 552                 ret = uvc_ctrl_commit(chain);
 553                 if (ret == 0)
 554                         ctrl->value = xctrl.value;
 555                 break;
 556         }
 557
 558         case VIDIOC_QUERYMENU:
 559                 return uvc_v4l2_query_menu(chain, arg);
 560
 561         case VIDIOC_G_EXT_CTRLS:
 562         {
 563                 struct v4l2_ext_controls *ctrls = arg;
 564                 struct v4l2_ext_control *ctrl = ctrls->controls;
 565                 unsigned int i;
 566
 567                 ret = uvc_ctrl_begin(chain);
 568                 if (ret < 0)
 569                         return ret;
 570
 571                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 572                         ret = uvc_ctrl_get(chain, ctrl);
 573                         if (ret < 0) {
 574                                 uvc_ctrl_rollback(chain);
 575                                 ctrls->error_idx = i;
 576                                 return ret;
 577                         }
 578                 }
 579                 ctrls->error_idx = 0;
 580                 ret = uvc_ctrl_rollback(chain);
 581                 break;
 582         }
 583
 584         case VIDIOC_S_EXT_CTRLS:
 585         case VIDIOC_TRY_EXT_CTRLS:
 586         {
 587                 struct v4l2_ext_controls *ctrls = arg;
 588                 struct v4l2_ext_control *ctrl = ctrls->controls;
 589                 unsigned int i;
 590
 591                 ret = uvc_ctrl_begin(chain);
 592                 if (ret < 0)
 593                         return ret;
 594
 595                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 596                         ret = uvc_ctrl_set(chain, ctrl);
 597                         if (ret < 0) {
 598                                 uvc_ctrl_rollback(chain);
 599                                 ctrls->error_idx = i;
 600                                 return ret;
 601                         }
 602                 }
 603
 604                 ctrls->error_idx = 0;
 605
 606                 if (cmd == VIDIOC_S_EXT_CTRLS)
 607                         ret = uvc_ctrl_commit(chain);
 608                 else
 609                         ret = uvc_ctrl_rollback(chain);
 610                 break;
 611         }
 612
 613         /* Get, Set & Enum input */
 614         case VIDIOC_ENUMINPUT:
 615         {
 616                 const struct uvc_entity *selector = chain->selector;
 617                 struct v4l2_input *input = arg;
 618                 struct uvc_entity *iterm = NULL;
 619                 u32 index = input->index;
 620                 int pin = 0;
 621
 622                 if (selector == NULL ||
 623                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 624                         if (index != 0)
 625                                 return -EINVAL;
 626                         list_for_each_entry(iterm, &chain->entities, chain) {
 627                                 if (UVC_ENTITY_IS_ITERM(iterm))
 628                                         break;
 629                         }
 630                         pin = iterm->id;
 631                 } else if (pin < selector->bNrInPins) {
 632                         pin = selector->baSourceID[index];
 633                         list_for_each_entry(iterm, &chain->entities, chain) {
 634                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 635                                         continue;
 636                                 if (iterm->id == pin)
 637                                         break;
 638                         }
 639                 }
 640
 641                 if (iterm == NULL || iterm->id != pin)
 642                         return -EINVAL;
 643
 644                 memset(input, 0, sizeof *input);
 645                 input->index = index;
 646                 strlcpy(input->name, iterm->name, sizeof input->name);
 647                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 648                         input->type = V4L2_INPUT_TYPE_CAMERA;
 649                 break;
 650         }
 651
 652         case VIDIOC_G_INPUT:
 653         {
 654                 u8 input;
 655
 656                 if (chain->selector == NULL ||
 657                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 658                         *(int *)arg = 0;
 659                         break;
 660                 }
 661
 662                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 663                         chain->selector->id, chain->dev->intfnum,
 664                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 665                 if (ret < 0)
 666                         return ret;
 667
 668                 *(int *)arg = input - 1;
 669                 break;
 670         }
 671
 672         case VIDIOC_S_INPUT:
 673         {
 674                 u32 input = *(u32 *)arg + 1;
 675
 676                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 677                         return ret;
 678
 679                 if (chain->selector == NULL ||
 680                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 681                         if (input != 1)
 682                                 return -EINVAL;
 683                         break;
 684                 }
 685
 686                 if (input == 0 || input > chain->selector->bNrInPins)
 687                         return -EINVAL;
 688
 689                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 690                         chain->selector->id, chain->dev->intfnum,
 691                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 692         }
 693
 694         /* Try, Get, Set & Enum format */
 695         case VIDIOC_ENUM_FMT:
 696         {
 697                 struct v4l2_fmtdesc *fmt = arg;
 698                 struct uvc_format *format;
 699                 enum v4l2_buf_type type = fmt->type;
 700                 __u32 index = fmt->index;
 701
 702                 if (fmt->type != stream->type ||
 703                     fmt->index >= stream->nformats)
 704                         return -EINVAL;
 705
 706                 memset(fmt, 0, sizeof(*fmt));
 707                 fmt->index = index;
 708                 fmt->type = type;
 709
 710                 format = &stream->format[fmt->index];
 711                 fmt->flags = 0;
 712                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 713                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 714                 strlcpy(fmt->description, format->name,
 715                         sizeof fmt->description);
 716                 fmt->description[sizeof fmt->description - 1] = 0;
 717                 fmt->pixelformat = format->fcc;
 718                 break;
 719         }
 720
 721         case VIDIOC_TRY_FMT:
 722         {
 723                 struct uvc_streaming_control probe;
 724
 725                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 726         }
 727
 728         case VIDIOC_S_FMT:
 729                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 730                         return ret;
 731
 732                 return uvc_v4l2_set_format(stream, arg);
 733
 734         case VIDIOC_G_FMT:
 735                 return uvc_v4l2_get_format(stream, arg);
 736
 737         /* Frame size enumeration */
 738         case VIDIOC_ENUM_FRAMESIZES:
 739         {
 740                 struct v4l2_frmsizeenum *fsize = arg;
 741                 struct uvc_format *format = NULL;
 742                 struct uvc_frame *frame;
 743                 int i;
 744
 745                 /* Look for the given pixel format */
 746                 for (i = 0; i < stream->nformats; i++) {
 747                         if (stream->format[i].fcc ==
 748                                         fsize->pixel_format) {
 749                                 format = &stream->format[i];
 750                                 break;
 751                         }
 752                 }
 753                 if (format == NULL)
 754                         return -EINVAL;
 755
 756                 if (fsize->index >= format->nframes)
 757                         return -EINVAL;
 758
 759                 frame = &format->frame[fsize->index];
 760                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 761                 fsize->discrete.width = frame->wWidth;
 762                 fsize->discrete.height = frame->wHeight;
 763                 break;
 764         }
 765
 766         /* Frame interval enumeration */
 767         case VIDIOC_ENUM_FRAMEINTERVALS:
 768         {
 769                 struct v4l2_frmivalenum *fival = arg;
 770                 struct uvc_format *format = NULL;
 771                 struct uvc_frame *frame = NULL;
 772                 int i;
 773
 774                 /* Look for the given pixel format and frame size */
 775                 for (i = 0; i < stream->nformats; i++) {
 776                         if (stream->format[i].fcc ==
 777                                         fival->pixel_format) {
 778                                 format = &stream->format[i];
 779                                 break;
 780                         }
 781                 }
 782                 if (format == NULL)
 783                         return -EINVAL;
 784
 785                 for (i = 0; i < format->nframes; i++) {
 786                         if (format->frame[i].wWidth == fival->width &&
 787                             format->frame[i].wHeight == fival->height) {
 788                                 frame = &format->frame[i];
 789                                 break;
 790                         }
 791                 }
 792                 if (frame == NULL)
 793                         return -EINVAL;
 794
 795                 if (frame->bFrameIntervalType) {
 796                         if (fival->index >= frame->bFrameIntervalType)
 797                                 return -EINVAL;
 798
 799                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 800                         fival->discrete.numerator =
 801                                 frame->dwFrameInterval[fival->index];
 802                         fival->discrete.denominator = 10000000;
 803                         uvc_simplify_fraction(&fival->discrete.numerator,
 804                                 &fival->discrete.denominator, 8, 333);
 805                 } else {
 806                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 807                         fival->stepwise.min.numerator =
 808                                 frame->dwFrameInterval[0];
 809                         fival->stepwise.min.denominator = 10000000;
 810                         fival->stepwise.max.numerator =
 811                                 frame->dwFrameInterval[1];
 812                         fival->stepwise.max.denominator = 10000000;
 813                         fival->stepwise.step.numerator =
 814                                 frame->dwFrameInterval[2];
 815                         fival->stepwise.step.denominator = 10000000;
 816                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 817                                 &fival->stepwise.min.denominator, 8, 333);
 818                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 819                                 &fival->stepwise.max.denominator, 8, 333);
 820                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 821                                 &fival->stepwise.step.denominator, 8, 333);
 822                 }
 823                 break;
 824         }
 825
 826         /* Get & Set streaming parameters */
 827         case VIDIOC_G_PARM:
 828                 return uvc_v4l2_get_streamparm(stream, arg);
 829
 830         case VIDIOC_S_PARM:
 831                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 832                         return ret;
 833
 834                 return uvc_v4l2_set_streamparm(stream, arg);
 835
 836         /* Cropping and scaling */
 837         case VIDIOC_CROPCAP:
 838         {
 839                 struct v4l2_cropcap *ccap = arg;
 840                 struct uvc_frame *frame = stream->cur_frame;
 841
 842                 if (ccap->type != stream->type)
 843                         return -EINVAL;
 844
 845                 ccap->bounds.left = 0;
 846                 ccap->bounds.top = 0;
 847                 ccap->bounds.width = frame->wWidth;
 848                 ccap->bounds.height = frame->wHeight;
 849
 850                 ccap->defrect = ccap->bounds;
 851
 852                 ccap->pixelaspect.numerator = 1;
 853                 ccap->pixelaspect.denominator = 1;
 854                 break;
 855         }
 856
 857         case VIDIOC_G_CROP:
 858         case VIDIOC_S_CROP:
 859                 return -EINVAL;
 860
 861         /* Buffers & streaming */
 862         case VIDIOC_REQBUFS:
 863         {
 864                 struct v4l2_requestbuffers *rb = arg;
 865                 unsigned int bufsize =
 866                         stream->ctrl.dwMaxVideoFrameSize;
 867
 868                 if (rb->type != stream->type ||
 869                     rb->memory != V4L2_MEMORY_MMAP)
 870                         return -EINVAL;
 871
 872                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 873                         return ret;
 874
 875                 ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize);
 876                 if (ret < 0)
 877                         return ret;
 878
 879                 if (ret == 0)
 880                         uvc_dismiss_privileges(handle);
 881
 882                 rb->count = ret;
 883                 ret = 0;
 884                 break;
 885         }
 886
 887         case VIDIOC_QUERYBUF:
 888         {
 889                 struct v4l2_buffer *buf = arg;
 890
 891                 if (buf->type != stream->type)
 892                         return -EINVAL;
 893
 894                 if (!uvc_has_privileges(handle))
 895                         return -EBUSY;
 896
 897                 return uvc_query_buffer(&stream->queue, buf);
 898         }
 899
 900         case VIDIOC_QBUF:
 901                 if (!uvc_has_privileges(handle))
 902                         return -EBUSY;
 903
 904                 return uvc_queue_buffer(&stream->queue, arg);
 905
 906         case VIDIOC_DQBUF:
 907                 if (!uvc_has_privileges(handle))
 908                         return -EBUSY;
 909
 910                 return uvc_dequeue_buffer(&stream->queue, arg,
 911                         file->f_flags & O_NONBLOCK);
 912
 913         case VIDIOC_STREAMON:
 914         {
 915                 int *type = arg;
 916
 917                 if (*type != stream->type)
 918                         return -EINVAL;
 919
 920                 if (!uvc_has_privileges(handle))
 921                         return -EBUSY;
 922
 923                 ret = uvc_video_enable(stream, 1);
 924                 if (ret < 0)
 925                         return ret;
 926                 break;
 927         }
 928
 929         case VIDIOC_STREAMOFF:
 930         {
 931                 int *type = arg;
 932
 933                 if (*type != stream->type)
 934                         return -EINVAL;
 935
 936                 if (!uvc_has_privileges(handle))
 937                         return -EBUSY;
 938
 939                 return uvc_video_enable(stream, 0);
 940         }
 941
 942         /* Analog video standards make no sense for digital cameras. */
 943         case VIDIOC_ENUMSTD:
 944         case VIDIOC_QUERYSTD:
 945         case VIDIOC_G_STD:
 946         case VIDIOC_S_STD:
 947
 948         case VIDIOC_OVERLAY:
 949
 950         case VIDIOC_ENUMAUDIO:
 951         case VIDIOC_ENUMAUDOUT:
 952
 953         case VIDIOC_ENUMOUTPUT:
 954                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 955                 return -EINVAL;
 956
 957         /* Dynamic controls. */
 958         case UVCIOC_CTRL_ADD:
 959         {
 960                 struct uvc_xu_control_info *xinfo = arg;
 961                 struct uvc_control_info *info;
 962
 963                 if (!capable(CAP_SYS_ADMIN))
 964                         return -EPERM;
 965
 966                 info = kzalloc(sizeof *info, GFP_KERNEL);
 967                 if (info == NULL)
 968                         return -ENOMEM;
 969
 970                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 971                 info->index = xinfo->index;
 972                 info->selector = xinfo->selector;
 973                 info->size = xinfo->size;
 974                 info->flags = xinfo->flags;
 975
 976                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 977                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 978
 979                 ret = uvc_ctrl_add_info(info);
 980                 if (ret < 0)
 981                         kfree(info);
 982                 break;
 983         }
 984
 985         case UVCIOC_CTRL_MAP:
 986         {
 987                 struct uvc_xu_control_mapping *xmap = arg;
 988                 struct uvc_control_mapping *map;
 989
 990                 if (!capable(CAP_SYS_ADMIN))
 991                         return -EPERM;
 992
 993                 map = kzalloc(sizeof *map, GFP_KERNEL);
 994                 if (map == NULL)
 995                         return -ENOMEM;
 996
 997                 map->id = xmap->id;
 998                 memcpy(map->name, xmap->name, sizeof map->name);
 999                 memcpy(map->entity, xmap->entity, sizeof map->entity);
1000                 map->selector = xmap->selector;
1001                 map->size = xmap->size;
1002                 map->offset = xmap->offset;
1003                 map->v4l2_type = xmap->v4l2_type;
1004                 map->data_type = xmap->data_type;
1005
1006                 ret = uvc_ctrl_add_mapping(map);
1007                 if (ret < 0)
1008                         kfree(map);
1009                 break;
1010         }
1011
1012         case UVCIOC_CTRL_GET:
1013                 return uvc_xu_ctrl_query(chain, arg, 0);
1014
1015         case UVCIOC_CTRL_SET:
1016                 return uvc_xu_ctrl_query(chain, arg, 1);
1017
1018         default:
1019                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1020                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1021                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1022                                   cmd);
1023                 return ret;
1024         }
1025
1026         return ret;
1027 }
1028
1029 static long uvc_v4l2_ioctl(struct file *file,
1030                      unsigned int cmd, unsigned long arg)
1031 {
1032         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1033                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1034                 v4l_printk_ioctl(cmd);
1035                 printk(")\n");
1036         }
1037
1038         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1039 }
1040
1041 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1042                     size_t count, loff_t *ppos)
1043 {
1044         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1045         return -EINVAL;
1046 }
1047
1048 /*
1049  * VMA operations.
1050  */
1051 static void uvc_vm_open(struct vm_area_struct *vma)
1052 {
1053         struct uvc_buffer *buffer = vma->vm_private_data;
1054         buffer->vma_use_count++;
1055 }
1056
1057 static void uvc_vm_close(struct vm_area_struct *vma)
1058 {
1059         struct uvc_buffer *buffer = vma->vm_private_data;
1060         buffer->vma_use_count--;
1061 }
1062
1063 static const struct vm_operations_struct uvc_vm_ops = {
1064         .open           = uvc_vm_open,
1065         .close          = uvc_vm_close,
1066 };
1067
1068 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1069 {
1070         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1071         struct uvc_streaming *stream = handle->stream;
1072         struct uvc_video_queue *queue = &stream->queue;
1073         struct uvc_buffer *uninitialized_var(buffer);
1074         struct page *page;
1075         unsigned long addr, start, size;
1076         unsigned int i;
1077         int ret = 0;
1078
1079         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1080
1081         start = vma->vm_start;
1082         size = vma->vm_end - vma->vm_start;
1083
1084         mutex_lock(&queue->mutex);
1085
1086         for (i = 0; i < queue->count; ++i) {
1087                 buffer = &queue->buffer[i];
1088                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1089                         break;
1090         }
1091
1092         if (i == queue->count || size != queue->buf_size) {
1093                 ret = -EINVAL;
1094                 goto done;
1095         }
1096
1097         /*
1098          * VM_IO marks the area as being an mmaped region for I/O to a
1099          * device. It also prevents the region from being core dumped.
1100          */
1101         vma->vm_flags |= VM_IO;
1102
1103         addr = (unsigned long)queue->mem + buffer->buf.m.offset;
1104         while (size > 0) {
1105                 page = vmalloc_to_page((void *)addr);
1106                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1107                         goto done;
1108
1109                 start += PAGE_SIZE;
1110                 addr += PAGE_SIZE;
1111                 size -= PAGE_SIZE;
1112         }
1113
1114         vma->vm_ops = &uvc_vm_ops;
1115         vma->vm_private_data = buffer;
1116         uvc_vm_open(vma);
1117
1118 done:
1119         mutex_unlock(&queue->mutex);
1120         return ret;
1121 }
1122
1123 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1124 {
1125         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1126         struct uvc_streaming *stream = handle->stream;
1127
1128         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1129
1130         return uvc_queue_poll(&stream->queue, file, wait);
1131 }
1132
1133 const struct v4l2_file_operations uvc_fops = {
1134         .owner          = THIS_MODULE,
1135         .open           = uvc_v4l2_open,
1136         .release        = uvc_v4l2_release,
1137         .ioctl          = uvc_v4l2_ioctl,
1138         .read           = uvc_v4l2_read,
1139         .mmap           = uvc_v4l2_mmap,
1140         .poll           = uvc_v4l2_poll,
1141 };
1142