drivers/media/video/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2008
   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 which 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         strncpy(query_menu->name, menu_info->name, 32);
  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 != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 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 != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 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 != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 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         if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
 256                 return ret;
 257
 258         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 259         video->streaming->cur_format = format;
 260         video->streaming->cur_frame = frame;
 261
 262         return 0;
 263 }
 264
 265 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
 266                 struct v4l2_streamparm *parm)
 267 {
 268         uint32_t numerator, denominator;
 269
 270         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 271                 return -EINVAL;
 272
 273         numerator = video->streaming->ctrl.dwFrameInterval;
 274         denominator = 10000000;
 275         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 276
 277         memset(parm, 0, sizeof *parm);
 278         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 279         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 280         parm->parm.capture.capturemode = 0;
 281         parm->parm.capture.timeperframe.numerator = numerator;
 282         parm->parm.capture.timeperframe.denominator = denominator;
 283         parm->parm.capture.extendedmode = 0;
 284         parm->parm.capture.readbuffers = 0;
 285
 286         return 0;
 287 }
 288
 289 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
 290                 struct v4l2_streamparm *parm)
 291 {
 292         struct uvc_frame *frame = video->streaming->cur_frame;
 293         struct uvc_streaming_control probe;
 294         uint32_t interval;
 295         int ret;
 296
 297         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 298                 return -EINVAL;
 299
 300         if (uvc_queue_streaming(&video->queue))
 301                 return -EBUSY;
 302
 303         memcpy(&probe, &video->streaming->ctrl, sizeof probe);
 304         interval = uvc_fraction_to_interval(
 305                         parm->parm.capture.timeperframe.numerator,
 306                         parm->parm.capture.timeperframe.denominator);
 307
 308         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 309                         parm->parm.capture.timeperframe.numerator,
 310                         parm->parm.capture.timeperframe.denominator,
 311                         interval);
 312         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 313
 314         /* Probe the device with the new settings. */
 315         if ((ret = uvc_probe_video(video, &probe)) < 0)
 316                 return ret;
 317
 318         /* Commit the new settings. */
 319         if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
 320                 return ret;
 321
 322         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 323
 324         /* Return the actual frame period. */
 325         parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
 326         parm->parm.capture.timeperframe.denominator = 10000000;
 327         uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
 328                                 &parm->parm.capture.timeperframe.denominator,
 329                                 8, 333);
 330
 331         return 0;
 332 }
 333
 334 /* ------------------------------------------------------------------------
 335  * Privilege management
 336  */
 337
 338 /*
 339  * Privilege management is the multiple-open implementation basis. The current
 340  * implementation is completely transparent for the end-user and doesn't
 341  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 342  * Those ioctls enable finer control on the device (by making possible for a
 343  * user to request exclusive access to a device), but are not mature yet.
 344  * Switching to the V4L2 priority mechanism might be considered in the future
 345  * if this situation changes.
 346  *
 347  * Each open instance of a UVC device can either be in a privileged or
 348  * unprivileged state. Only a single instance can be in a privileged state at
 349  * a given time. Trying to perform an operation which requires privileges will
 350  * automatically acquire the required privileges if possible, or return -EBUSY
 351  * otherwise. Privileges are dismissed when closing the instance.
 352  *
 353  * Operations which require privileges are:
 354  *
 355  * - VIDIOC_S_INPUT
 356  * - VIDIOC_S_PARM
 357  * - VIDIOC_S_FMT
 358  * - VIDIOC_TRY_FMT
 359  * - VIDIOC_REQBUFS
 360  */
 361 static int uvc_acquire_privileges(struct uvc_fh *handle)
 362 {
 363         int ret = 0;
 364
 365         /* Always succeed if the handle is already privileged. */
 366         if (handle->state == UVC_HANDLE_ACTIVE)
 367                 return 0;
 368
 369         /* Check if the device already has a privileged handle. */
 370         mutex_lock(&uvc_driver.open_mutex);
 371         if (atomic_inc_return(&handle->device->active) != 1) {
 372                 atomic_dec(&handle->device->active);
 373                 ret = -EBUSY;
 374                 goto done;
 375         }
 376
 377         handle->state = UVC_HANDLE_ACTIVE;
 378
 379 done:
 380         mutex_unlock(&uvc_driver.open_mutex);
 381         return ret;
 382 }
 383
 384 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 385 {
 386         if (handle->state == UVC_HANDLE_ACTIVE)
 387                 atomic_dec(&handle->device->active);
 388
 389         handle->state = UVC_HANDLE_PASSIVE;
 390 }
 391
 392 static int uvc_has_privileges(struct uvc_fh *handle)
 393 {
 394         return handle->state == UVC_HANDLE_ACTIVE;
 395 }
 396
 397 /* ------------------------------------------------------------------------
 398  * V4L2 file operations
 399  */
 400
 401 static int uvc_v4l2_open(struct inode *inode, struct file *file)
 402 {
 403         struct uvc_video_device *video;
 404         struct uvc_fh *handle;
 405         int ret = 0;
 406
 407         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 408         mutex_lock(&uvc_driver.open_mutex);
 409         video = video_drvdata(file);
 410
 411         if (video->dev->state & UVC_DEV_DISCONNECTED) {
 412                 ret = -ENODEV;
 413                 goto done;
 414         }
 415
 416         ret = usb_autopm_get_interface(video->dev->intf);
 417         if (ret < 0)
 418                 goto done;
 419
 420         /* Create the device handle. */
 421         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 422         if (handle == NULL) {
 423                 usb_autopm_put_interface(video->dev->intf);
 424                 ret = -ENOMEM;
 425                 goto done;
 426         }
 427
 428         handle->device = video;
 429         handle->state = UVC_HANDLE_PASSIVE;
 430         file->private_data = handle;
 431
 432         kref_get(&video->dev->kref);
 433
 434 done:
 435         mutex_unlock(&uvc_driver.open_mutex);
 436         return ret;
 437 }
 438
 439 static int uvc_v4l2_release(struct inode *inode, struct file *file)
 440 {
 441         struct uvc_video_device *video = video_drvdata(file);
 442         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 443
 444         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 445
 446         /* Only free resources if this is a privileged handle. */
 447         if (uvc_has_privileges(handle)) {
 448                 uvc_video_enable(video, 0);
 449
 450                 mutex_lock(&video->queue.mutex);
 451                 if (uvc_free_buffers(&video->queue) < 0)
 452                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 453                                         "free buffers.\n");
 454                 mutex_unlock(&video->queue.mutex);
 455         }
 456
 457         /* Release the file handle. */
 458         uvc_dismiss_privileges(handle);
 459         kfree(handle);
 460         file->private_data = NULL;
 461
 462         usb_autopm_put_interface(video->dev->intf);
 463         kref_put(&video->dev->kref, uvc_delete);
 464         return 0;
 465 }
 466
 467 static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
 468                      unsigned int cmd, void *arg)
 469 {
 470         struct video_device *vdev = video_devdata(file);
 471         struct uvc_video_device *video = video_get_drvdata(vdev);
 472         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 473         int ret = 0;
 474
 475         if (uvc_trace_param & UVC_TRACE_IOCTL)
 476                 v4l_printk_ioctl(cmd);
 477
 478         switch (cmd) {
 479         /* Query capabilities */
 480         case VIDIOC_QUERYCAP:
 481         {
 482                 struct v4l2_capability *cap = arg;
 483
 484                 memset(cap, 0, sizeof *cap);
 485                 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
 486                 strncpy(cap->card, vdev->name, 32);
 487                 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
 488                         sizeof cap->bus_info);
 489                 cap->version = DRIVER_VERSION_NUMBER;
 490                 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 491                                   | V4L2_CAP_STREAMING;
 492                 break;
 493         }
 494
 495         /* Get, Set & Query control */
 496         case VIDIOC_QUERYCTRL:
 497                 return uvc_query_v4l2_ctrl(video, arg);
 498
 499         case VIDIOC_G_CTRL:
 500         {
 501                 struct v4l2_control *ctrl = arg;
 502                 struct v4l2_ext_control xctrl;
 503
 504                 memset(&xctrl, 0, sizeof xctrl);
 505                 xctrl.id = ctrl->id;
 506
 507                 uvc_ctrl_begin(video);
 508                 ret = uvc_ctrl_get(video, &xctrl);
 509                 uvc_ctrl_rollback(video);
 510                 if (ret >= 0)
 511                         ctrl->value = xctrl.value;
 512                 break;
 513         }
 514
 515         case VIDIOC_S_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                 xctrl.value = ctrl->value;
 523
 524                 uvc_ctrl_begin(video);
 525                 ret = uvc_ctrl_set(video, &xctrl);
 526                 if (ret < 0) {
 527                         uvc_ctrl_rollback(video);
 528                         return ret;
 529                 }
 530                 ret = uvc_ctrl_commit(video);
 531                 break;
 532         }
 533
 534         case VIDIOC_QUERYMENU:
 535                 return uvc_v4l2_query_menu(video, arg);
 536
 537         case VIDIOC_G_EXT_CTRLS:
 538         {
 539                 struct v4l2_ext_controls *ctrls = arg;
 540                 struct v4l2_ext_control *ctrl = ctrls->controls;
 541                 unsigned int i;
 542
 543                 uvc_ctrl_begin(video);
 544                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 545                         ret = uvc_ctrl_get(video, ctrl);
 546                         if (ret < 0) {
 547                                 uvc_ctrl_rollback(video);
 548                                 ctrls->error_idx = i;
 549                                 return ret;
 550                         }
 551                 }
 552                 ctrls->error_idx = 0;
 553                 ret = uvc_ctrl_rollback(video);
 554                 break;
 555         }
 556
 557         case VIDIOC_S_EXT_CTRLS:
 558         case VIDIOC_TRY_EXT_CTRLS:
 559         {
 560                 struct v4l2_ext_controls *ctrls = arg;
 561                 struct v4l2_ext_control *ctrl = ctrls->controls;
 562                 unsigned int i;
 563
 564                 ret = uvc_ctrl_begin(video);
 565                 if (ret < 0)
 566                         return ret;
 567
 568                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 569                         ret = uvc_ctrl_set(video, ctrl);
 570                         if (ret < 0) {
 571                                 uvc_ctrl_rollback(video);
 572                                 ctrls->error_idx = i;
 573                                 return ret;
 574                         }
 575                 }
 576
 577                 ctrls->error_idx = 0;
 578
 579                 if (cmd == VIDIOC_S_EXT_CTRLS)
 580                         ret = uvc_ctrl_commit(video);
 581                 else
 582                         ret = uvc_ctrl_rollback(video);
 583                 break;
 584         }
 585
 586         /* Get, Set & Enum input */
 587         case VIDIOC_ENUMINPUT:
 588         {
 589                 const struct uvc_entity *selector = video->selector;
 590                 struct v4l2_input *input = arg;
 591                 struct uvc_entity *iterm = NULL;
 592                 u32 index = input->index;
 593                 int pin = 0;
 594
 595                 if (selector == NULL ||
 596                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 597                         if (index != 0)
 598                                 return -EINVAL;
 599                         iterm = list_first_entry(&video->iterms,
 600                                         struct uvc_entity, chain);
 601                         pin = iterm->id;
 602                 } else if (pin < selector->selector.bNrInPins) {
 603                         pin = selector->selector.baSourceID[index];
 604                         list_for_each_entry(iterm, video->iterms.next, chain) {
 605                                 if (iterm->id == pin)
 606                                         break;
 607                         }
 608                 }
 609
 610                 if (iterm == NULL || iterm->id != pin)
 611                         return -EINVAL;
 612
 613                 memset(input, 0, sizeof *input);
 614                 input->index = index;
 615                 strncpy(input->name, iterm->name, sizeof input->name);
 616                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 617                         input->type = V4L2_INPUT_TYPE_CAMERA;
 618                 break;
 619         }
 620
 621         case VIDIOC_G_INPUT:
 622         {
 623                 u8 input;
 624
 625                 if (video->selector == NULL ||
 626                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 627                         *(int *)arg = 0;
 628                         break;
 629                 }
 630
 631                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
 632                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 633                         &input, 1);
 634                 if (ret < 0)
 635                         return ret;
 636
 637                 *(int *)arg = input - 1;
 638                 break;
 639         }
 640
 641         case VIDIOC_S_INPUT:
 642         {
 643                 u8 input = *(u32 *)arg + 1;
 644
 645                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 646                         return ret;
 647
 648                 if (video->selector == NULL ||
 649                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 650                         if (input != 1)
 651                                 return -EINVAL;
 652                         break;
 653                 }
 654
 655                 if (input > video->selector->selector.bNrInPins)
 656                         return -EINVAL;
 657
 658                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
 659                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 660                         &input, 1);
 661         }
 662
 663         /* Try, Get, Set & Enum format */
 664         case VIDIOC_ENUM_FMT:
 665         {
 666                 struct v4l2_fmtdesc *fmt = arg;
 667                 struct uvc_format *format;
 668
 669                 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 670                     fmt->index >= video->streaming->nformats)
 671                         return -EINVAL;
 672
 673                 format = &video->streaming->format[fmt->index];
 674                 fmt->flags = 0;
 675                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 676                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 677                 strncpy(fmt->description, format->name,
 678                         sizeof fmt->description);
 679                 fmt->description[sizeof fmt->description - 1] = 0;
 680                 fmt->pixelformat = format->fcc;
 681                 break;
 682         }
 683
 684         case VIDIOC_TRY_FMT:
 685         {
 686                 struct uvc_streaming_control probe;
 687
 688                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 689                         return ret;
 690
 691                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
 692         }
 693
 694         case VIDIOC_S_FMT:
 695                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 696                         return ret;
 697
 698                 return uvc_v4l2_set_format(video, arg);
 699
 700         case VIDIOC_G_FMT:
 701                 return uvc_v4l2_get_format(video, arg);
 702
 703         /* Frame size enumeration */
 704         case VIDIOC_ENUM_FRAMESIZES:
 705         {
 706                 struct v4l2_frmsizeenum *fsize = arg;
 707                 struct uvc_format *format = NULL;
 708                 struct uvc_frame *frame;
 709                 int i;
 710
 711                 /* Look for the given pixel format */
 712                 for (i = 0; i < video->streaming->nformats; i++) {
 713                         if (video->streaming->format[i].fcc ==
 714                                         fsize->pixel_format) {
 715                                 format = &video->streaming->format[i];
 716                                 break;
 717                         }
 718                 }
 719                 if (format == NULL)
 720                         return -EINVAL;
 721
 722                 if (fsize->index >= format->nframes)
 723                         return -EINVAL;
 724
 725                 frame = &format->frame[fsize->index];
 726                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 727                 fsize->discrete.width = frame->wWidth;
 728                 fsize->discrete.height = frame->wHeight;
 729                 break;
 730         }
 731
 732         /* Frame interval enumeration */
 733         case VIDIOC_ENUM_FRAMEINTERVALS:
 734         {
 735                 struct v4l2_frmivalenum *fival = arg;
 736                 struct uvc_format *format = NULL;
 737                 struct uvc_frame *frame = NULL;
 738                 int i;
 739
 740                 /* Look for the given pixel format and frame size */
 741                 for (i = 0; i < video->streaming->nformats; i++) {
 742                         if (video->streaming->format[i].fcc ==
 743                                         fival->pixel_format) {
 744                                 format = &video->streaming->format[i];
 745                                 break;
 746                         }
 747                 }
 748                 if (format == NULL)
 749                         return -EINVAL;
 750
 751                 for (i = 0; i < format->nframes; i++) {
 752                         if (format->frame[i].wWidth == fival->width &&
 753                             format->frame[i].wHeight == fival->height) {
 754                                 frame = &format->frame[i];
 755                                 break;
 756                         }
 757                 }
 758                 if (frame == NULL)
 759                         return -EINVAL;
 760
 761                 if (frame->bFrameIntervalType) {
 762                         if (fival->index >= frame->bFrameIntervalType)
 763                                 return -EINVAL;
 764
 765                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 766                         fival->discrete.numerator =
 767                                 frame->dwFrameInterval[fival->index];
 768                         fival->discrete.denominator = 10000000;
 769                         uvc_simplify_fraction(&fival->discrete.numerator,
 770                                 &fival->discrete.denominator, 8, 333);
 771                 } else {
 772                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 773                         fival->stepwise.min.numerator =
 774                                 frame->dwFrameInterval[0];
 775                         fival->stepwise.min.denominator = 10000000;
 776                         fival->stepwise.max.numerator =
 777                                 frame->dwFrameInterval[1];
 778                         fival->stepwise.max.denominator = 10000000;
 779                         fival->stepwise.step.numerator =
 780                                 frame->dwFrameInterval[2];
 781                         fival->stepwise.step.denominator = 10000000;
 782                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 783                                 &fival->stepwise.min.denominator, 8, 333);
 784                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 785                                 &fival->stepwise.max.denominator, 8, 333);
 786                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 787                                 &fival->stepwise.step.denominator, 8, 333);
 788                 }
 789                 break;
 790         }
 791
 792         /* Get & Set streaming parameters */
 793         case VIDIOC_G_PARM:
 794                 return uvc_v4l2_get_streamparm(video, arg);
 795
 796         case VIDIOC_S_PARM:
 797                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 798                         return ret;
 799
 800                 return uvc_v4l2_set_streamparm(video, arg);
 801
 802         /* Cropping and scaling */
 803         case VIDIOC_CROPCAP:
 804         {
 805                 struct v4l2_cropcap *ccap = arg;
 806                 struct uvc_frame *frame = video->streaming->cur_frame;
 807
 808                 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 809                         return -EINVAL;
 810
 811                 ccap->bounds.left = 0;
 812                 ccap->bounds.top = 0;
 813                 ccap->bounds.width = frame->wWidth;
 814                 ccap->bounds.height = frame->wHeight;
 815
 816                 ccap->defrect = ccap->bounds;
 817
 818                 ccap->pixelaspect.numerator = 1;
 819                 ccap->pixelaspect.denominator = 1;
 820                 break;
 821         }
 822
 823         case VIDIOC_G_CROP:
 824         case VIDIOC_S_CROP:
 825                 return -EINVAL;
 826
 827         /* Buffers & streaming */
 828         case VIDIOC_REQBUFS:
 829         {
 830                 struct v4l2_requestbuffers *rb = arg;
 831                 unsigned int bufsize =
 832                         video->streaming->ctrl.dwMaxVideoFrameSize;
 833
 834                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 835                     rb->memory != V4L2_MEMORY_MMAP)
 836                         return -EINVAL;
 837
 838                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 839                         return ret;
 840
 841                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
 842                 if (ret < 0)
 843                         return ret;
 844
 845                 rb->count = ret;
 846                 ret = 0;
 847                 break;
 848         }
 849
 850         case VIDIOC_QUERYBUF:
 851         {
 852                 struct v4l2_buffer *buf = arg;
 853
 854                 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 855                         return -EINVAL;
 856
 857                 if (!uvc_has_privileges(handle))
 858                         return -EBUSY;
 859
 860                 return uvc_query_buffer(&video->queue, buf);
 861         }
 862
 863         case VIDIOC_QBUF:
 864                 if (!uvc_has_privileges(handle))
 865                         return -EBUSY;
 866
 867                 return uvc_queue_buffer(&video->queue, arg);
 868
 869         case VIDIOC_DQBUF:
 870                 if (!uvc_has_privileges(handle))
 871                         return -EBUSY;
 872
 873                 return uvc_dequeue_buffer(&video->queue, arg,
 874                         file->f_flags & O_NONBLOCK);
 875
 876         case VIDIOC_STREAMON:
 877         {
 878                 int *type = arg;
 879
 880                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 881                         return -EINVAL;
 882
 883                 if (!uvc_has_privileges(handle))
 884                         return -EBUSY;
 885
 886                 if ((ret = uvc_video_enable(video, 1)) < 0)
 887                         return ret;
 888                 break;
 889         }
 890
 891         case VIDIOC_STREAMOFF:
 892         {
 893                 int *type = arg;
 894
 895                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 896                         return -EINVAL;
 897
 898                 if (!uvc_has_privileges(handle))
 899                         return -EBUSY;
 900
 901                 return uvc_video_enable(video, 0);
 902         }
 903
 904         /* Analog video standards make no sense for digital cameras. */
 905         case VIDIOC_ENUMSTD:
 906         case VIDIOC_QUERYSTD:
 907         case VIDIOC_G_STD:
 908         case VIDIOC_S_STD:
 909
 910         case VIDIOC_OVERLAY:
 911
 912         case VIDIOC_ENUMAUDIO:
 913         case VIDIOC_ENUMAUDOUT:
 914
 915         case VIDIOC_ENUMOUTPUT:
 916                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 917                 return -EINVAL;
 918
 919         /* Dynamic controls. */
 920         case UVCIOC_CTRL_ADD:
 921         {
 922                 struct uvc_xu_control_info *xinfo = arg;
 923                 struct uvc_control_info *info;
 924
 925                 if (!capable(CAP_SYS_ADMIN))
 926                         return -EPERM;
 927
 928                 info = kmalloc(sizeof *info, GFP_KERNEL);
 929                 if (info == NULL)
 930                         return -ENOMEM;
 931
 932                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 933                 info->index = xinfo->index;
 934                 info->selector = xinfo->selector;
 935                 info->size = xinfo->size;
 936                 info->flags = xinfo->flags;
 937
 938                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 939                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 940
 941                 ret = uvc_ctrl_add_info(info);
 942                 if (ret < 0)
 943                         kfree(info);
 944                 break;
 945         }
 946
 947         case UVCIOC_CTRL_MAP:
 948         {
 949                 struct uvc_xu_control_mapping *xmap = arg;
 950                 struct uvc_control_mapping *map;
 951
 952                 if (!capable(CAP_SYS_ADMIN))
 953                         return -EPERM;
 954
 955                 map = kmalloc(sizeof *map, GFP_KERNEL);
 956                 if (map == NULL)
 957                         return -ENOMEM;
 958
 959                 map->id = xmap->id;
 960                 memcpy(map->name, xmap->name, sizeof map->name);
 961                 memcpy(map->entity, xmap->entity, sizeof map->entity);
 962                 map->selector = xmap->selector;
 963                 map->size = xmap->size;
 964                 map->offset = xmap->offset;
 965                 map->v4l2_type = xmap->v4l2_type;
 966                 map->data_type = xmap->data_type;
 967
 968                 ret = uvc_ctrl_add_mapping(map);
 969                 if (ret < 0)
 970                         kfree(map);
 971                 break;
 972         }
 973
 974         case UVCIOC_CTRL_GET:
 975                 return uvc_xu_ctrl_query(video, arg, 0);
 976
 977         case UVCIOC_CTRL_SET:
 978                 return uvc_xu_ctrl_query(video, arg, 1);
 979
 980         default:
 981                 if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
 982                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
 983                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
 984                                   cmd);
 985                 return ret;
 986         }
 987
 988         return ret;
 989 }
 990
 991 static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
 992                      unsigned int cmd, unsigned long arg)
 993 {
 994         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
 995         return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
 996 }
 997
 998 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
 999                     size_t count, loff_t *ppos)
1000 {
1001         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1002         return -ENODEV;
1003 }
1004
1005 /*
1006  * VMA operations.
1007  */
1008 static void uvc_vm_open(struct vm_area_struct *vma)
1009 {
1010         struct uvc_buffer *buffer = vma->vm_private_data;
1011         buffer->vma_use_count++;
1012 }
1013
1014 static void uvc_vm_close(struct vm_area_struct *vma)
1015 {
1016         struct uvc_buffer *buffer = vma->vm_private_data;
1017         buffer->vma_use_count--;
1018 }
1019
1020 static struct vm_operations_struct uvc_vm_ops = {
1021         .open           = uvc_vm_open,
1022         .close          = uvc_vm_close,
1023 };
1024
1025 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1026 {
1027         struct uvc_video_device *video = video_drvdata(file);
1028         struct uvc_buffer *uninitialized_var(buffer);
1029         struct page *page;
1030         unsigned long addr, start, size;
1031         unsigned int i;
1032         int ret = 0;
1033
1034         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1035
1036         start = vma->vm_start;
1037         size = vma->vm_end - vma->vm_start;
1038
1039         mutex_lock(&video->queue.mutex);
1040
1041         for (i = 0; i < video->queue.count; ++i) {
1042                 buffer = &video->queue.buffer[i];
1043                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1044                         break;
1045         }
1046
1047         if (i == video->queue.count || size != video->queue.buf_size) {
1048                 ret = -EINVAL;
1049                 goto done;
1050         }
1051
1052         /*
1053          * VM_IO marks the area as being an mmaped region for I/O to a
1054          * device. It also prevents the region from being core dumped.
1055          */
1056         vma->vm_flags |= VM_IO;
1057
1058         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1059         while (size > 0) {
1060                 page = vmalloc_to_page((void *)addr);
1061                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1062                         goto done;
1063
1064                 start += PAGE_SIZE;
1065                 addr += PAGE_SIZE;
1066                 size -= PAGE_SIZE;
1067         }
1068
1069         vma->vm_ops = &uvc_vm_ops;
1070         vma->vm_private_data = buffer;
1071         uvc_vm_open(vma);
1072
1073 done:
1074         mutex_unlock(&video->queue.mutex);
1075         return ret;
1076 }
1077
1078 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1079 {
1080         struct uvc_video_device *video = video_drvdata(file);
1081
1082         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1083
1084         return uvc_queue_poll(&video->queue, file, wait);
1085 }
1086
1087 struct file_operations uvc_fops = {
1088         .owner          = THIS_MODULE,
1089         .open           = uvc_v4l2_open,
1090         .release        = uvc_v4l2_release,
1091         .ioctl          = uvc_v4l2_ioctl,
1092         .compat_ioctl   = v4l_compat_ioctl32,
1093         .llseek         = no_llseek,
1094         .read           = uvc_v4l2_read,
1095         .mmap           = uvc_v4l2_mmap,
1096         .poll           = uvc_v4l2_poll,
1097 };
1098