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/usb.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/mm.h>
  22 #include <linux/wait.h>
  23 #include <asm/atomic.h>
  24
  25 #include <media/v4l2-common.h>
  26 #include <media/v4l2-ioctl.h>
  27
  28 #include "uvcvideo.h"
  29
  30 /* ------------------------------------------------------------------------
  31  * V4L2 interface
  32  */
  33
  34 /*
  35  * Mapping V4L2 controls to UVC controls can be straighforward if done well.
  36  * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
  37  * must be grouped (for instance the Red Balance, Blue Balance and Do White
  38  * Balance V4L2 controls use the White Balance Component UVC control) or
  39  * otherwise translated. The approach we take here is to use a translation
  40  * table for the controls that can be mapped directly, and handle the others
  41  * manually.
  42  */
  43 static int uvc_v4l2_query_menu(struct uvc_video_device *video,
  44         struct v4l2_querymenu *query_menu)
  45 {
  46         struct uvc_menu_info *menu_info;
  47         struct uvc_control_mapping *mapping;
  48         struct uvc_control *ctrl;
  49         u32 index = query_menu->index;
  50         u32 id = query_menu->id;
  51
  52         ctrl = uvc_find_control(video, query_menu->id, &mapping);
  53         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
  54                 return -EINVAL;
  55
  56         if (query_menu->index >= mapping->menu_count)
  57                 return -EINVAL;
  58
  59         memset(query_menu, 0, sizeof(*query_menu));
  60         query_menu->id = id;
  61         query_menu->index = index;
  62
  63         menu_info = &mapping->menu_info[query_menu->index];
  64         strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
  65         return 0;
  66 }
  67
  68 /*
  69  * Find the frame interval closest to the requested frame interval for the
  70  * given frame format and size. This should be done by the device as part of
  71  * the Video Probe and Commit negotiation, but some hardware don't implement
  72  * that feature.
  73  */
  74 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
  75 {
  76         unsigned int i;
  77
  78         if (frame->bFrameIntervalType) {
  79                 __u32 best = -1, dist;
  80
  81                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
  82                         dist = interval > frame->dwFrameInterval[i]
  83                              ? interval - frame->dwFrameInterval[i]
  84                              : frame->dwFrameInterval[i] - interval;
  85
  86                         if (dist > best)
  87                                 break;
  88
  89                         best = dist;
  90                 }
  91
  92                 interval = frame->dwFrameInterval[i-1];
  93         } else {
  94                 const __u32 min = frame->dwFrameInterval[0];
  95                 const __u32 max = frame->dwFrameInterval[1];
  96                 const __u32 step = frame->dwFrameInterval[2];
  97
  98                 interval = min + (interval - min + step/2) / step * step;
  99                 if (interval > max)
 100                         interval = max;
 101         }
 102
 103         return interval;
 104 }
 105
 106 static int uvc_v4l2_try_format(struct uvc_video_device *video,
 107         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 108         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 109 {
 110         struct uvc_format *format = NULL;
 111         struct uvc_frame *frame = NULL;
 112         __u16 rw, rh;
 113         unsigned int d, maxd;
 114         unsigned int i;
 115         __u32 interval;
 116         int ret = 0;
 117         __u8 *fcc;
 118
 119         if (fmt->type != video->streaming->type)
 120                 return -EINVAL;
 121
 122         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 123         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 124                         fmt->fmt.pix.pixelformat,
 125                         fcc[0], fcc[1], fcc[2], fcc[3],
 126                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 127
 128         /* Check if the hardware supports the requested format. */
 129         for (i = 0; i < video->streaming->nformats; ++i) {
 130                 format = &video->streaming->format[i];
 131                 if (format->fcc == fmt->fmt.pix.pixelformat)
 132                         break;
 133         }
 134
 135         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
 136                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
 137                                 fmt->fmt.pix.pixelformat);
 138                 return -EINVAL;
 139         }
 140
 141         /* Find the closest image size. The distance between image sizes is
 142          * the size in pixels of the non-overlapping regions between the
 143          * requested size and the frame-specified size.
 144          */
 145         rw = fmt->fmt.pix.width;
 146         rh = fmt->fmt.pix.height;
 147         maxd = (unsigned int)-1;
 148
 149         for (i = 0; i < format->nframes; ++i) {
 150                 __u16 w = format->frame[i].wWidth;
 151                 __u16 h = format->frame[i].wHeight;
 152
 153                 d = min(w, rw) * min(h, rh);
 154                 d = w*h + rw*rh - 2*d;
 155                 if (d < maxd) {
 156                         maxd = d;
 157                         frame = &format->frame[i];
 158                 }
 159
 160                 if (maxd == 0)
 161                         break;
 162         }
 163
 164         if (frame == NULL) {
 165                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 166                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 167                 return -EINVAL;
 168         }
 169
 170         /* Use the default frame interval. */
 171         interval = frame->dwDefaultFrameInterval;
 172         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 173                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 174                 (100000000/interval)%10);
 175
 176         /* Set the format index, frame index and frame interval. */
 177         memset(probe, 0, sizeof *probe);
 178         probe->bmHint = 1;      /* dwFrameInterval */
 179         probe->bFormatIndex = format->index;
 180         probe->bFrameIndex = frame->bFrameIndex;
 181         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 182         /* Some webcams stall the probe control set request when the
 183          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 184          * clearly states that the field is read-only from the host, so this
 185          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 186          * the webcam to work around the problem.
 187          *
 188          * The workaround could probably be enabled for all webcams, so the
 189          * quirk can be removed if needed. It's currently useful to detect
 190          * webcam bugs and fix them before they hit the market (providing
 191          * developers test their webcams with the Linux driver as well as with
 192          * the Windows driver).
 193          */
 194         if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 195                 probe->dwMaxVideoFrameSize =
 196                         video->streaming->ctrl.dwMaxVideoFrameSize;
 197
 198         /* Probe the device. */
 199         if ((ret = uvc_probe_video(video, probe)) < 0)
 200                 goto done;
 201
 202         fmt->fmt.pix.width = frame->wWidth;
 203         fmt->fmt.pix.height = frame->wHeight;
 204         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 205         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 206         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 207         fmt->fmt.pix.colorspace = format->colorspace;
 208         fmt->fmt.pix.priv = 0;
 209
 210         if (uvc_format != NULL)
 211                 *uvc_format = format;
 212         if (uvc_frame != NULL)
 213                 *uvc_frame = frame;
 214
 215 done:
 216         return ret;
 217 }
 218
 219 static int uvc_v4l2_get_format(struct uvc_video_device *video,
 220         struct v4l2_format *fmt)
 221 {
 222         struct uvc_format *format = video->streaming->cur_format;
 223         struct uvc_frame *frame = video->streaming->cur_frame;
 224
 225         if (fmt->type != video->streaming->type)
 226                 return -EINVAL;
 227
 228         if (format == NULL || frame == NULL)
 229                 return -EINVAL;
 230
 231         fmt->fmt.pix.pixelformat = format->fcc;
 232         fmt->fmt.pix.width = frame->wWidth;
 233         fmt->fmt.pix.height = frame->wHeight;
 234         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 235         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 236         fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
 237         fmt->fmt.pix.colorspace = format->colorspace;
 238         fmt->fmt.pix.priv = 0;
 239
 240         return 0;
 241 }
 242
 243 static int uvc_v4l2_set_format(struct uvc_video_device *video,
 244         struct v4l2_format *fmt)
 245 {
 246         struct uvc_streaming_control probe;
 247         struct uvc_format *format;
 248         struct uvc_frame *frame;
 249         int ret;
 250
 251         if (fmt->type != video->streaming->type)
 252                 return -EINVAL;
 253
 254         if (uvc_queue_allocated(&video->queue))
 255                 return -EBUSY;
 256
 257         ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
 258         if (ret < 0)
 259                 return ret;
 260
 261         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 262         video->streaming->cur_format = format;
 263         video->streaming->cur_frame = frame;
 264
 265         return 0;
 266 }
 267
 268 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
 269                 struct v4l2_streamparm *parm)
 270 {
 271         uint32_t numerator, denominator;
 272
 273         if (parm->type != video->streaming->type)
 274                 return -EINVAL;
 275
 276         numerator = video->streaming->ctrl.dwFrameInterval;
 277         denominator = 10000000;
 278         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 279
 280         memset(parm, 0, sizeof *parm);
 281         parm->type = video->streaming->type;
 282
 283         if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 284                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 285                 parm->parm.capture.capturemode = 0;
 286                 parm->parm.capture.timeperframe.numerator = numerator;
 287                 parm->parm.capture.timeperframe.denominator = denominator;
 288                 parm->parm.capture.extendedmode = 0;
 289                 parm->parm.capture.readbuffers = 0;
 290         } else {
 291                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 292                 parm->parm.output.outputmode = 0;
 293                 parm->parm.output.timeperframe.numerator = numerator;
 294                 parm->parm.output.timeperframe.denominator = denominator;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
 301                 struct v4l2_streamparm *parm)
 302 {
 303         struct uvc_frame *frame = video->streaming->cur_frame;
 304         struct uvc_streaming_control probe;
 305         struct v4l2_fract timeperframe;
 306         uint32_t interval;
 307         int ret;
 308
 309         if (parm->type != video->streaming->type)
 310                 return -EINVAL;
 311
 312         if (uvc_queue_streaming(&video->queue))
 313                 return -EBUSY;
 314
 315         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 316                 timeperframe = parm->parm.capture.timeperframe;
 317         else
 318                 timeperframe = parm->parm.output.timeperframe;
 319
 320         memcpy(&probe, &video->streaming->ctrl, sizeof probe);
 321         interval = uvc_fraction_to_interval(timeperframe.numerator,
 322                 timeperframe.denominator);
 323
 324         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 325                 timeperframe.numerator, timeperframe.denominator, interval);
 326         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 327
 328         /* Probe the device with the new settings. */
 329         if ((ret = uvc_probe_video(video, &probe)) < 0)
 330                 return ret;
 331
 332         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 333
 334         /* Return the actual frame period. */
 335         timeperframe.numerator = probe.dwFrameInterval;
 336         timeperframe.denominator = 10000000;
 337         uvc_simplify_fraction(&timeperframe.numerator,
 338                 &timeperframe.denominator, 8, 333);
 339
 340         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 341                 parm->parm.capture.timeperframe = timeperframe;
 342         else
 343                 parm->parm.output.timeperframe = timeperframe;
 344
 345         return 0;
 346 }
 347
 348 /* ------------------------------------------------------------------------
 349  * Privilege management
 350  */
 351
 352 /*
 353  * Privilege management is the multiple-open implementation basis. The current
 354  * implementation is completely transparent for the end-user and doesn't
 355  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 356  * Those ioctls enable finer control on the device (by making possible for a
 357  * user to request exclusive access to a device), but are not mature yet.
 358  * Switching to the V4L2 priority mechanism might be considered in the future
 359  * if this situation changes.
 360  *
 361  * Each open instance of a UVC device can either be in a privileged or
 362  * unprivileged state. Only a single instance can be in a privileged state at
 363  * a given time. Trying to perform an operation that requires privileges will
 364  * automatically acquire the required privileges if possible, or return -EBUSY
 365  * otherwise. Privileges are dismissed when closing the instance.
 366  *
 367  * Operations that require privileges are:
 368  *
 369  * - VIDIOC_S_INPUT
 370  * - VIDIOC_S_PARM
 371  * - VIDIOC_S_FMT
 372  * - VIDIOC_TRY_FMT
 373  * - VIDIOC_REQBUFS
 374  */
 375 static int uvc_acquire_privileges(struct uvc_fh *handle)
 376 {
 377         int ret = 0;
 378
 379         /* Always succeed if the handle is already privileged. */
 380         if (handle->state == UVC_HANDLE_ACTIVE)
 381                 return 0;
 382
 383         /* Check if the device already has a privileged handle. */
 384         mutex_lock(&uvc_driver.open_mutex);
 385         if (atomic_inc_return(&handle->device->active) != 1) {
 386                 atomic_dec(&handle->device->active);
 387                 ret = -EBUSY;
 388                 goto done;
 389         }
 390
 391         handle->state = UVC_HANDLE_ACTIVE;
 392
 393 done:
 394         mutex_unlock(&uvc_driver.open_mutex);
 395         return ret;
 396 }
 397
 398 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 399 {
 400         if (handle->state == UVC_HANDLE_ACTIVE)
 401                 atomic_dec(&handle->device->active);
 402
 403         handle->state = UVC_HANDLE_PASSIVE;
 404 }
 405
 406 static int uvc_has_privileges(struct uvc_fh *handle)
 407 {
 408         return handle->state == UVC_HANDLE_ACTIVE;
 409 }
 410
 411 /* ------------------------------------------------------------------------
 412  * V4L2 file operations
 413  */
 414
 415 static int uvc_v4l2_open(struct file *file)
 416 {
 417         struct uvc_video_device *video;
 418         struct uvc_fh *handle;
 419         int ret = 0;
 420
 421         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 422         mutex_lock(&uvc_driver.open_mutex);
 423         video = video_drvdata(file);
 424
 425         if (video->dev->state & UVC_DEV_DISCONNECTED) {
 426                 ret = -ENODEV;
 427                 goto done;
 428         }
 429
 430         ret = usb_autopm_get_interface(video->dev->intf);
 431         if (ret < 0)
 432                 goto done;
 433
 434         /* Create the device handle. */
 435         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 436         if (handle == NULL) {
 437                 usb_autopm_put_interface(video->dev->intf);
 438                 ret = -ENOMEM;
 439                 goto done;
 440         }
 441
 442         if (atomic_inc_return(&video->dev->users) == 1) {
 443                 if ((ret = uvc_status_start(video->dev)) < 0) {
 444                         usb_autopm_put_interface(video->dev->intf);
 445                         atomic_dec(&video->dev->users);
 446                         kfree(handle);
 447                         goto done;
 448                 }
 449         }
 450
 451         handle->device = video;
 452         handle->state = UVC_HANDLE_PASSIVE;
 453         file->private_data = handle;
 454
 455         kref_get(&video->dev->kref);
 456
 457 done:
 458         mutex_unlock(&uvc_driver.open_mutex);
 459         return ret;
 460 }
 461
 462 static int uvc_v4l2_release(struct file *file)
 463 {
 464         struct uvc_video_device *video = video_drvdata(file);
 465         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 466
 467         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 468
 469         /* Only free resources if this is a privileged handle. */
 470         if (uvc_has_privileges(handle)) {
 471                 uvc_video_enable(video, 0);
 472
 473                 mutex_lock(&video->queue.mutex);
 474                 if (uvc_free_buffers(&video->queue) < 0)
 475                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 476                                         "free buffers.\n");
 477                 mutex_unlock(&video->queue.mutex);
 478         }
 479
 480         /* Release the file handle. */
 481         uvc_dismiss_privileges(handle);
 482         kfree(handle);
 483         file->private_data = NULL;
 484
 485         if (atomic_dec_return(&video->dev->users) == 0)
 486                 uvc_status_stop(video->dev);
 487
 488         usb_autopm_put_interface(video->dev->intf);
 489         kref_put(&video->dev->kref, uvc_delete);
 490         return 0;
 491 }
 492
 493 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 494 {
 495         struct video_device *vdev = video_devdata(file);
 496         struct uvc_video_device *video = video_get_drvdata(vdev);
 497         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 498         long ret = 0;
 499
 500         switch (cmd) {
 501         /* Query capabilities */
 502         case VIDIOC_QUERYCAP:
 503         {
 504                 struct v4l2_capability *cap = arg;
 505
 506                 memset(cap, 0, sizeof *cap);
 507                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 508                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 509                 usb_make_path(video->dev->udev,
 510                               cap->bus_info, sizeof(cap->bus_info));
 511                 cap->version = DRIVER_VERSION_NUMBER;
 512                 if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 513                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 514                                           | V4L2_CAP_STREAMING;
 515                 else
 516                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
 517                                           | V4L2_CAP_STREAMING;
 518                 break;
 519         }
 520
 521         /* Get, Set & Query control */
 522         case VIDIOC_QUERYCTRL:
 523                 return uvc_query_v4l2_ctrl(video, arg);
 524
 525         case VIDIOC_G_CTRL:
 526         {
 527                 struct v4l2_control *ctrl = arg;
 528                 struct v4l2_ext_control xctrl;
 529
 530                 memset(&xctrl, 0, sizeof xctrl);
 531                 xctrl.id = ctrl->id;
 532
 533                 uvc_ctrl_begin(video);
 534                 ret = uvc_ctrl_get(video, &xctrl);
 535                 uvc_ctrl_rollback(video);
 536                 if (ret >= 0)
 537                         ctrl->value = xctrl.value;
 538                 break;
 539         }
 540
 541         case VIDIOC_S_CTRL:
 542         {
 543                 struct v4l2_control *ctrl = arg;
 544                 struct v4l2_ext_control xctrl;
 545
 546                 memset(&xctrl, 0, sizeof xctrl);
 547                 xctrl.id = ctrl->id;
 548                 xctrl.value = ctrl->value;
 549
 550                 uvc_ctrl_begin(video);
 551                 ret = uvc_ctrl_set(video, &xctrl);
 552                 if (ret < 0) {
 553                         uvc_ctrl_rollback(video);
 554                         return ret;
 555                 }
 556                 ret = uvc_ctrl_commit(video);
 557                 break;
 558         }
 559
 560         case VIDIOC_QUERYMENU:
 561                 return uvc_v4l2_query_menu(video, arg);
 562
 563         case VIDIOC_G_EXT_CTRLS:
 564         {
 565                 struct v4l2_ext_controls *ctrls = arg;
 566                 struct v4l2_ext_control *ctrl = ctrls->controls;
 567                 unsigned int i;
 568
 569                 uvc_ctrl_begin(video);
 570                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 571                         ret = uvc_ctrl_get(video, ctrl);
 572                         if (ret < 0) {
 573                                 uvc_ctrl_rollback(video);
 574                                 ctrls->error_idx = i;
 575                                 return ret;
 576                         }
 577                 }
 578                 ctrls->error_idx = 0;
 579                 ret = uvc_ctrl_rollback(video);
 580                 break;
 581         }
 582
 583         case VIDIOC_S_EXT_CTRLS:
 584         case VIDIOC_TRY_EXT_CTRLS:
 585         {
 586                 struct v4l2_ext_controls *ctrls = arg;
 587                 struct v4l2_ext_control *ctrl = ctrls->controls;
 588                 unsigned int i;
 589
 590                 ret = uvc_ctrl_begin(video);
 591                 if (ret < 0)
 592                         return ret;
 593
 594                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 595                         ret = uvc_ctrl_set(video, ctrl);
 596                         if (ret < 0) {
 597                                 uvc_ctrl_rollback(video);
 598                                 ctrls->error_idx = i;
 599                                 return ret;
 600                         }
 601                 }
 602
 603                 ctrls->error_idx = 0;
 604
 605                 if (cmd == VIDIOC_S_EXT_CTRLS)
 606                         ret = uvc_ctrl_commit(video);
 607                 else
 608                         ret = uvc_ctrl_rollback(video);
 609                 break;
 610         }
 611
 612         /* Get, Set & Enum input */
 613         case VIDIOC_ENUMINPUT:
 614         {
 615                 const struct uvc_entity *selector = video->selector;
 616                 struct v4l2_input *input = arg;
 617                 struct uvc_entity *iterm = NULL;
 618                 u32 index = input->index;
 619                 int pin = 0;
 620
 621                 if (selector == NULL ||
 622                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 623                         if (index != 0)
 624                                 return -EINVAL;
 625                         iterm = list_first_entry(&video->iterms,
 626                                         struct uvc_entity, chain);
 627                         pin = iterm->id;
 628                 } else if (pin < selector->selector.bNrInPins) {
 629                         pin = selector->selector.baSourceID[index];
 630                         list_for_each_entry(iterm, video->iterms.next, chain) {
 631                                 if (iterm->id == pin)
 632                                         break;
 633                         }
 634                 }
 635
 636                 if (iterm == NULL || iterm->id != pin)
 637                         return -EINVAL;
 638
 639                 memset(input, 0, sizeof *input);
 640                 input->index = index;
 641                 strlcpy(input->name, iterm->name, sizeof input->name);
 642                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 643                         input->type = V4L2_INPUT_TYPE_CAMERA;
 644                 break;
 645         }
 646
 647         case VIDIOC_G_INPUT:
 648         {
 649                 u8 input;
 650
 651                 if (video->selector == NULL ||
 652                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 653                         *(int *)arg = 0;
 654                         break;
 655                 }
 656
 657                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
 658                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 659                         &input, 1);
 660                 if (ret < 0)
 661                         return ret;
 662
 663                 *(int *)arg = input - 1;
 664                 break;
 665         }
 666
 667         case VIDIOC_S_INPUT:
 668         {
 669                 u32 input = *(u32 *)arg + 1;
 670
 671                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 672                         return ret;
 673
 674                 if (video->selector == NULL ||
 675                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 676                         if (input != 1)
 677                                 return -EINVAL;
 678                         break;
 679                 }
 680
 681                 if (input == 0 || input > video->selector->selector.bNrInPins)
 682                         return -EINVAL;
 683
 684                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
 685                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 686                         &input, 1);
 687         }
 688
 689         /* Try, Get, Set & Enum format */
 690         case VIDIOC_ENUM_FMT:
 691         {
 692                 struct v4l2_fmtdesc *fmt = arg;
 693                 struct uvc_format *format;
 694                 enum v4l2_buf_type type = fmt->type;
 695                 __u32 index = fmt->index;
 696
 697                 if (fmt->type != video->streaming->type ||
 698                     fmt->index >= video->streaming->nformats)
 699                         return -EINVAL;
 700
 701                 memset(fmt, 0, sizeof(*fmt));
 702                 fmt->index = index;
 703                 fmt->type = type;
 704
 705                 format = &video->streaming->format[fmt->index];
 706                 fmt->flags = 0;
 707                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 708                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 709                 strlcpy(fmt->description, format->name,
 710                         sizeof fmt->description);
 711                 fmt->description[sizeof fmt->description - 1] = 0;
 712                 fmt->pixelformat = format->fcc;
 713                 break;
 714         }
 715
 716         case VIDIOC_TRY_FMT:
 717         {
 718                 struct uvc_streaming_control probe;
 719
 720                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 721                         return ret;
 722
 723                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
 724         }
 725
 726         case VIDIOC_S_FMT:
 727                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 728                         return ret;
 729
 730                 return uvc_v4l2_set_format(video, arg);
 731
 732         case VIDIOC_G_FMT:
 733                 return uvc_v4l2_get_format(video, arg);
 734
 735         /* Frame size enumeration */
 736         case VIDIOC_ENUM_FRAMESIZES:
 737         {
 738                 struct v4l2_frmsizeenum *fsize = arg;
 739                 struct uvc_format *format = NULL;
 740                 struct uvc_frame *frame;
 741                 int i;
 742
 743                 /* Look for the given pixel format */
 744                 for (i = 0; i < video->streaming->nformats; i++) {
 745                         if (video->streaming->format[i].fcc ==
 746                                         fsize->pixel_format) {
 747                                 format = &video->streaming->format[i];
 748                                 break;
 749                         }
 750                 }
 751                 if (format == NULL)
 752                         return -EINVAL;
 753
 754                 if (fsize->index >= format->nframes)
 755                         return -EINVAL;
 756
 757                 frame = &format->frame[fsize->index];
 758                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 759                 fsize->discrete.width = frame->wWidth;
 760                 fsize->discrete.height = frame->wHeight;
 761                 break;
 762         }
 763
 764         /* Frame interval enumeration */
 765         case VIDIOC_ENUM_FRAMEINTERVALS:
 766         {
 767                 struct v4l2_frmivalenum *fival = arg;
 768                 struct uvc_format *format = NULL;
 769                 struct uvc_frame *frame = NULL;
 770                 int i;
 771
 772                 /* Look for the given pixel format and frame size */
 773                 for (i = 0; i < video->streaming->nformats; i++) {
 774                         if (video->streaming->format[i].fcc ==
 775                                         fival->pixel_format) {
 776                                 format = &video->streaming->format[i];
 777                                 break;
 778                         }
 779                 }
 780                 if (format == NULL)
 781                         return -EINVAL;
 782
 783                 for (i = 0; i < format->nframes; i++) {
 784                         if (format->frame[i].wWidth == fival->width &&
 785                             format->frame[i].wHeight == fival->height) {
 786                                 frame = &format->frame[i];
 787                                 break;
 788                         }
 789                 }
 790                 if (frame == NULL)
 791                         return -EINVAL;
 792
 793                 if (frame->bFrameIntervalType) {
 794                         if (fival->index >= frame->bFrameIntervalType)
 795                                 return -EINVAL;
 796
 797                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 798                         fival->discrete.numerator =
 799                                 frame->dwFrameInterval[fival->index];
 800                         fival->discrete.denominator = 10000000;
 801                         uvc_simplify_fraction(&fival->discrete.numerator,
 802                                 &fival->discrete.denominator, 8, 333);
 803                 } else {
 804                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 805                         fival->stepwise.min.numerator =
 806                                 frame->dwFrameInterval[0];
 807                         fival->stepwise.min.denominator = 10000000;
 808                         fival->stepwise.max.numerator =
 809                                 frame->dwFrameInterval[1];
 810                         fival->stepwise.max.denominator = 10000000;
 811                         fival->stepwise.step.numerator =
 812                                 frame->dwFrameInterval[2];
 813                         fival->stepwise.step.denominator = 10000000;
 814                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 815                                 &fival->stepwise.min.denominator, 8, 333);
 816                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 817                                 &fival->stepwise.max.denominator, 8, 333);
 818                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 819                                 &fival->stepwise.step.denominator, 8, 333);
 820                 }
 821                 break;
 822         }
 823
 824         /* Get & Set streaming parameters */
 825         case VIDIOC_G_PARM:
 826                 return uvc_v4l2_get_streamparm(video, arg);
 827
 828         case VIDIOC_S_PARM:
 829                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 830                         return ret;
 831
 832                 return uvc_v4l2_set_streamparm(video, arg);
 833
 834         /* Cropping and scaling */
 835         case VIDIOC_CROPCAP:
 836         {
 837                 struct v4l2_cropcap *ccap = arg;
 838                 struct uvc_frame *frame = video->streaming->cur_frame;
 839
 840                 if (ccap->type != video->streaming->type)
 841                         return -EINVAL;
 842
 843                 ccap->bounds.left = 0;
 844                 ccap->bounds.top = 0;
 845                 ccap->bounds.width = frame->wWidth;
 846                 ccap->bounds.height = frame->wHeight;
 847
 848                 ccap->defrect = ccap->bounds;
 849
 850                 ccap->pixelaspect.numerator = 1;
 851                 ccap->pixelaspect.denominator = 1;
 852                 break;
 853         }
 854
 855         case VIDIOC_G_CROP:
 856         case VIDIOC_S_CROP:
 857                 return -EINVAL;
 858
 859         /* Buffers & streaming */
 860         case VIDIOC_REQBUFS:
 861         {
 862                 struct v4l2_requestbuffers *rb = arg;
 863                 unsigned int bufsize =
 864                         video->streaming->ctrl.dwMaxVideoFrameSize;
 865
 866                 if (rb->type != video->streaming->type ||
 867                     rb->memory != V4L2_MEMORY_MMAP)
 868                         return -EINVAL;
 869
 870                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 871                         return ret;
 872
 873                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
 874                 if (ret < 0)
 875                         return ret;
 876
 877                 rb->count = ret;
 878                 ret = 0;
 879                 break;
 880         }
 881
 882         case VIDIOC_QUERYBUF:
 883         {
 884                 struct v4l2_buffer *buf = arg;
 885
 886                 if (buf->type != video->streaming->type)
 887                         return -EINVAL;
 888
 889                 if (!uvc_has_privileges(handle))
 890                         return -EBUSY;
 891
 892                 return uvc_query_buffer(&video->queue, buf);
 893         }
 894
 895         case VIDIOC_QBUF:
 896                 if (!uvc_has_privileges(handle))
 897                         return -EBUSY;
 898
 899                 return uvc_queue_buffer(&video->queue, arg);
 900
 901         case VIDIOC_DQBUF:
 902                 if (!uvc_has_privileges(handle))
 903                         return -EBUSY;
 904
 905                 return uvc_dequeue_buffer(&video->queue, arg,
 906                         file->f_flags & O_NONBLOCK);
 907
 908         case VIDIOC_STREAMON:
 909         {
 910                 int *type = arg;
 911
 912                 if (*type != video->streaming->type)
 913                         return -EINVAL;
 914
 915                 if (!uvc_has_privileges(handle))
 916                         return -EBUSY;
 917
 918                 if ((ret = uvc_video_enable(video, 1)) < 0)
 919                         return ret;
 920                 break;
 921         }
 922
 923         case VIDIOC_STREAMOFF:
 924         {
 925                 int *type = arg;
 926
 927                 if (*type != video->streaming->type)
 928                         return -EINVAL;
 929
 930                 if (!uvc_has_privileges(handle))
 931                         return -EBUSY;
 932
 933                 return uvc_video_enable(video, 0);
 934         }
 935
 936         /* Analog video standards make no sense for digital cameras. */
 937         case VIDIOC_ENUMSTD:
 938         case VIDIOC_QUERYSTD:
 939         case VIDIOC_G_STD:
 940         case VIDIOC_S_STD:
 941
 942         case VIDIOC_OVERLAY:
 943
 944         case VIDIOC_ENUMAUDIO:
 945         case VIDIOC_ENUMAUDOUT:
 946
 947         case VIDIOC_ENUMOUTPUT:
 948                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 949                 return -EINVAL;
 950
 951         /* Dynamic controls. */
 952         case UVCIOC_CTRL_ADD:
 953         {
 954                 struct uvc_xu_control_info *xinfo = arg;
 955                 struct uvc_control_info *info;
 956
 957                 if (!capable(CAP_SYS_ADMIN))
 958                         return -EPERM;
 959
 960                 info = kzalloc(sizeof *info, GFP_KERNEL);
 961                 if (info == NULL)
 962                         return -ENOMEM;
 963
 964                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 965                 info->index = xinfo->index;
 966                 info->selector = xinfo->selector;
 967                 info->size = xinfo->size;
 968                 info->flags = xinfo->flags;
 969
 970                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 971                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 972
 973                 ret = uvc_ctrl_add_info(info);
 974                 if (ret < 0)
 975                         kfree(info);
 976                 break;
 977         }
 978
 979         case UVCIOC_CTRL_MAP:
 980         {
 981                 struct uvc_xu_control_mapping *xmap = arg;
 982                 struct uvc_control_mapping *map;
 983
 984                 if (!capable(CAP_SYS_ADMIN))
 985                         return -EPERM;
 986
 987                 map = kzalloc(sizeof *map, GFP_KERNEL);
 988                 if (map == NULL)
 989                         return -ENOMEM;
 990
 991                 map->id = xmap->id;
 992                 memcpy(map->name, xmap->name, sizeof map->name);
 993                 memcpy(map->entity, xmap->entity, sizeof map->entity);
 994                 map->selector = xmap->selector;
 995                 map->size = xmap->size;
 996                 map->offset = xmap->offset;
 997                 map->v4l2_type = xmap->v4l2_type;
 998                 map->data_type = xmap->data_type;
 999
1000                 ret = uvc_ctrl_add_mapping(map);
1001                 if (ret < 0)
1002                         kfree(map);
1003                 break;
1004         }
1005
1006         case UVCIOC_CTRL_GET:
1007                 return uvc_xu_ctrl_query(video, arg, 0);
1008
1009         case UVCIOC_CTRL_SET:
1010                 return uvc_xu_ctrl_query(video, arg, 1);
1011
1012         default:
1013                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1014                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1015                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1016                                   cmd);
1017                 return ret;
1018         }
1019
1020         return ret;
1021 }
1022
1023 static long uvc_v4l2_ioctl(struct file *file,
1024                      unsigned int cmd, unsigned long arg)
1025 {
1026         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1027                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1028                 v4l_printk_ioctl(cmd);
1029                 printk(")\n");
1030         }
1031
1032         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1033 }
1034
1035 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1036                     size_t count, loff_t *ppos)
1037 {
1038         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1039         return -ENODEV;
1040 }
1041
1042 /*
1043  * VMA operations.
1044  */
1045 static void uvc_vm_open(struct vm_area_struct *vma)
1046 {
1047         struct uvc_buffer *buffer = vma->vm_private_data;
1048         buffer->vma_use_count++;
1049 }
1050
1051 static void uvc_vm_close(struct vm_area_struct *vma)
1052 {
1053         struct uvc_buffer *buffer = vma->vm_private_data;
1054         buffer->vma_use_count--;
1055 }
1056
1057 static struct vm_operations_struct uvc_vm_ops = {
1058         .open           = uvc_vm_open,
1059         .close          = uvc_vm_close,
1060 };
1061
1062 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1063 {
1064         struct uvc_video_device *video = video_drvdata(file);
1065         struct uvc_buffer *uninitialized_var(buffer);
1066         struct page *page;
1067         unsigned long addr, start, size;
1068         unsigned int i;
1069         int ret = 0;
1070
1071         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1072
1073         start = vma->vm_start;
1074         size = vma->vm_end - vma->vm_start;
1075
1076         mutex_lock(&video->queue.mutex);
1077
1078         for (i = 0; i < video->queue.count; ++i) {
1079                 buffer = &video->queue.buffer[i];
1080                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1081                         break;
1082         }
1083
1084         if (i == video->queue.count || size != video->queue.buf_size) {
1085                 ret = -EINVAL;
1086                 goto done;
1087         }
1088
1089         /*
1090          * VM_IO marks the area as being an mmaped region for I/O to a
1091          * device. It also prevents the region from being core dumped.
1092          */
1093         vma->vm_flags |= VM_IO;
1094
1095         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1096         while (size > 0) {
1097                 page = vmalloc_to_page((void *)addr);
1098                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1099                         goto done;
1100
1101                 start += PAGE_SIZE;
1102                 addr += PAGE_SIZE;
1103                 size -= PAGE_SIZE;
1104         }
1105
1106         vma->vm_ops = &uvc_vm_ops;
1107         vma->vm_private_data = buffer;
1108         uvc_vm_open(vma);
1109
1110 done:
1111         mutex_unlock(&video->queue.mutex);
1112         return ret;
1113 }
1114
1115 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1116 {
1117         struct uvc_video_device *video = video_drvdata(file);
1118
1119         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1120
1121         return uvc_queue_poll(&video->queue, file, wait);
1122 }
1123
1124 const struct v4l2_file_operations uvc_fops = {
1125         .owner          = THIS_MODULE,
1126         .open           = uvc_v4l2_open,
1127         .release        = uvc_v4l2_release,
1128         .ioctl          = uvc_v4l2_ioctl,
1129         .read           = uvc_v4l2_read,
1130         .mmap           = uvc_v4l2_mmap,
1131         .poll           = uvc_v4l2_poll,
1132 };
1133