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