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

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2008
   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 file *file, unsigned int cmd, void *arg)
 468 {
 469         struct video_device *vdev = video_devdata(file);
 470         struct uvc_video_device *video = video_get_drvdata(vdev);
 471         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 472         int ret = 0;
 473
 474         if (uvc_trace_param & UVC_TRACE_IOCTL)
 475                 v4l_printk_ioctl(cmd);
 476
 477         switch (cmd) {
 478         /* Query capabilities */
 479         case VIDIOC_QUERYCAP:
 480         {
 481                 struct v4l2_capability *cap = arg;
 482
 483                 memset(cap, 0, sizeof *cap);
 484                 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
 485                 strncpy(cap->card, vdev->name, 32);
 486                 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
 487                         sizeof cap->bus_info);
 488                 cap->version = DRIVER_VERSION_NUMBER;
 489                 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 490                                   | V4L2_CAP_STREAMING;
 491                 break;
 492         }
 493
 494         /* Get, Set & Query control */
 495         case VIDIOC_QUERYCTRL:
 496                 return uvc_query_v4l2_ctrl(video, arg);
 497
 498         case VIDIOC_G_CTRL:
 499         {
 500                 struct v4l2_control *ctrl = arg;
 501                 struct v4l2_ext_control xctrl;
 502
 503                 memset(&xctrl, 0, sizeof xctrl);
 504                 xctrl.id = ctrl->id;
 505
 506                 uvc_ctrl_begin(video);
 507                 ret = uvc_ctrl_get(video, &xctrl);
 508                 uvc_ctrl_rollback(video);
 509                 if (ret >= 0)
 510                         ctrl->value = xctrl.value;
 511                 break;
 512         }
 513
 514         case VIDIOC_S_CTRL:
 515         {
 516                 struct v4l2_control *ctrl = arg;
 517                 struct v4l2_ext_control xctrl;
 518
 519                 memset(&xctrl, 0, sizeof xctrl);
 520                 xctrl.id = ctrl->id;
 521                 xctrl.value = ctrl->value;
 522
 523                 uvc_ctrl_begin(video);
 524                 ret = uvc_ctrl_set(video, &xctrl);
 525                 if (ret < 0) {
 526                         uvc_ctrl_rollback(video);
 527                         return ret;
 528                 }
 529                 ret = uvc_ctrl_commit(video);
 530                 break;
 531         }
 532
 533         case VIDIOC_QUERYMENU:
 534                 return uvc_v4l2_query_menu(video, arg);
 535
 536         case VIDIOC_G_EXT_CTRLS:
 537         {
 538                 struct v4l2_ext_controls *ctrls = arg;
 539                 struct v4l2_ext_control *ctrl = ctrls->controls;
 540                 unsigned int i;
 541
 542                 uvc_ctrl_begin(video);
 543                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 544                         ret = uvc_ctrl_get(video, ctrl);
 545                         if (ret < 0) {
 546                                 uvc_ctrl_rollback(video);
 547                                 ctrls->error_idx = i;
 548                                 return ret;
 549                         }
 550                 }
 551                 ctrls->error_idx = 0;
 552                 ret = uvc_ctrl_rollback(video);
 553                 break;
 554         }
 555
 556         case VIDIOC_S_EXT_CTRLS:
 557         case VIDIOC_TRY_EXT_CTRLS:
 558         {
 559                 struct v4l2_ext_controls *ctrls = arg;
 560                 struct v4l2_ext_control *ctrl = ctrls->controls;
 561                 unsigned int i;
 562
 563                 ret = uvc_ctrl_begin(video);
 564                 if (ret < 0)
 565                         return ret;
 566
 567                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 568                         ret = uvc_ctrl_set(video, ctrl);
 569                         if (ret < 0) {
 570                                 uvc_ctrl_rollback(video);
 571                                 ctrls->error_idx = i;
 572                                 return ret;
 573                         }
 574                 }
 575
 576                 ctrls->error_idx = 0;
 577
 578                 if (cmd == VIDIOC_S_EXT_CTRLS)
 579                         ret = uvc_ctrl_commit(video);
 580                 else
 581                         ret = uvc_ctrl_rollback(video);
 582                 break;
 583         }
 584
 585         /* Get, Set & Enum input */
 586         case VIDIOC_ENUMINPUT:
 587         {
 588                 const struct uvc_entity *selector = video->selector;
 589                 struct v4l2_input *input = arg;
 590                 struct uvc_entity *iterm = NULL;
 591                 u32 index = input->index;
 592                 int pin = 0;
 593
 594                 if (selector == NULL ||
 595                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 596                         if (index != 0)
 597                                 return -EINVAL;
 598                         iterm = list_first_entry(&video->iterms,
 599                                         struct uvc_entity, chain);
 600                         pin = iterm->id;
 601                 } else if (pin < selector->selector.bNrInPins) {
 602                         pin = selector->selector.baSourceID[index];
 603                         list_for_each_entry(iterm, video->iterms.next, chain) {
 604                                 if (iterm->id == pin)
 605                                         break;
 606                         }
 607                 }
 608
 609                 if (iterm == NULL || iterm->id != pin)
 610                         return -EINVAL;
 611
 612                 memset(input, 0, sizeof *input);
 613                 input->index = index;
 614                 strncpy(input->name, iterm->name, sizeof input->name);
 615                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 616                         input->type = V4L2_INPUT_TYPE_CAMERA;
 617                 break;
 618         }
 619
 620         case VIDIOC_G_INPUT:
 621         {
 622                 u8 input;
 623
 624                 if (video->selector == NULL ||
 625                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 626                         *(int *)arg = 0;
 627                         break;
 628                 }
 629
 630                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
 631                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 632                         &input, 1);
 633                 if (ret < 0)
 634                         return ret;
 635
 636                 *(int *)arg = input - 1;
 637                 break;
 638         }
 639
 640         case VIDIOC_S_INPUT:
 641         {
 642                 u8 input = *(u32 *)arg + 1;
 643
 644                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 645                         return ret;
 646
 647                 if (video->selector == NULL ||
 648                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 649                         if (input != 1)
 650                                 return -EINVAL;
 651                         break;
 652                 }
 653
 654                 if (input > video->selector->selector.bNrInPins)
 655                         return -EINVAL;
 656
 657                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
 658                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 659                         &input, 1);
 660         }
 661
 662         /* Try, Get, Set & Enum format */
 663         case VIDIOC_ENUM_FMT:
 664         {
 665                 struct v4l2_fmtdesc *fmt = arg;
 666                 struct uvc_format *format;
 667
 668                 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 669                     fmt->index >= video->streaming->nformats)
 670                         return -EINVAL;
 671
 672                 format = &video->streaming->format[fmt->index];
 673                 fmt->flags = 0;
 674                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 675                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 676                 strncpy(fmt->description, format->name,
 677                         sizeof fmt->description);
 678                 fmt->description[sizeof fmt->description - 1] = 0;
 679                 fmt->pixelformat = format->fcc;
 680                 break;
 681         }
 682
 683         case VIDIOC_TRY_FMT:
 684         {
 685                 struct uvc_streaming_control probe;
 686
 687                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 688                         return ret;
 689
 690                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
 691         }
 692
 693         case VIDIOC_S_FMT:
 694                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 695                         return ret;
 696
 697                 return uvc_v4l2_set_format(video, arg);
 698
 699         case VIDIOC_G_FMT:
 700                 return uvc_v4l2_get_format(video, arg);
 701
 702         /* Frame size enumeration */
 703         case VIDIOC_ENUM_FRAMESIZES:
 704         {
 705                 struct v4l2_frmsizeenum *fsize = arg;
 706                 struct uvc_format *format = NULL;
 707                 struct uvc_frame *frame;
 708                 int i;
 709
 710                 /* Look for the given pixel format */
 711                 for (i = 0; i < video->streaming->nformats; i++) {
 712                         if (video->streaming->format[i].fcc ==
 713                                         fsize->pixel_format) {
 714                                 format = &video->streaming->format[i];
 715                                 break;
 716                         }
 717                 }
 718                 if (format == NULL)
 719                         return -EINVAL;
 720
 721                 if (fsize->index >= format->nframes)
 722                         return -EINVAL;
 723
 724                 frame = &format->frame[fsize->index];
 725                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 726                 fsize->discrete.width = frame->wWidth;
 727                 fsize->discrete.height = frame->wHeight;
 728                 break;
 729         }
 730
 731         /* Frame interval enumeration */
 732         case VIDIOC_ENUM_FRAMEINTERVALS:
 733         {
 734                 struct v4l2_frmivalenum *fival = arg;
 735                 struct uvc_format *format = NULL;
 736                 struct uvc_frame *frame = NULL;
 737                 int i;
 738
 739                 /* Look for the given pixel format and frame size */
 740                 for (i = 0; i < video->streaming->nformats; i++) {
 741                         if (video->streaming->format[i].fcc ==
 742                                         fival->pixel_format) {
 743                                 format = &video->streaming->format[i];
 744                                 break;
 745                         }
 746                 }
 747                 if (format == NULL)
 748                         return -EINVAL;
 749
 750                 for (i = 0; i < format->nframes; i++) {
 751                         if (format->frame[i].wWidth == fival->width &&
 752                             format->frame[i].wHeight == fival->height) {
 753                                 frame = &format->frame[i];
 754                                 break;
 755                         }
 756                 }
 757                 if (frame == NULL)
 758                         return -EINVAL;
 759
 760                 if (frame->bFrameIntervalType) {
 761                         if (fival->index >= frame->bFrameIntervalType)
 762                                 return -EINVAL;
 763
 764                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 765                         fival->discrete.numerator =
 766                                 frame->dwFrameInterval[fival->index];
 767                         fival->discrete.denominator = 10000000;
 768                         uvc_simplify_fraction(&fival->discrete.numerator,
 769                                 &fival->discrete.denominator, 8, 333);
 770                 } else {
 771                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 772                         fival->stepwise.min.numerator =
 773                                 frame->dwFrameInterval[0];
 774                         fival->stepwise.min.denominator = 10000000;
 775                         fival->stepwise.max.numerator =
 776                                 frame->dwFrameInterval[1];
 777                         fival->stepwise.max.denominator = 10000000;
 778                         fival->stepwise.step.numerator =
 779                                 frame->dwFrameInterval[2];
 780                         fival->stepwise.step.denominator = 10000000;
 781                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 782                                 &fival->stepwise.min.denominator, 8, 333);
 783                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 784                                 &fival->stepwise.max.denominator, 8, 333);
 785                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 786                                 &fival->stepwise.step.denominator, 8, 333);
 787                 }
 788                 break;
 789         }
 790
 791         /* Get & Set streaming parameters */
 792         case VIDIOC_G_PARM:
 793                 return uvc_v4l2_get_streamparm(video, arg);
 794
 795         case VIDIOC_S_PARM:
 796                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 797                         return ret;
 798
 799                 return uvc_v4l2_set_streamparm(video, arg);
 800
 801         /* Cropping and scaling */
 802         case VIDIOC_CROPCAP:
 803         {
 804                 struct v4l2_cropcap *ccap = arg;
 805                 struct uvc_frame *frame = video->streaming->cur_frame;
 806
 807                 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 808                         return -EINVAL;
 809
 810                 ccap->bounds.left = 0;
 811                 ccap->bounds.top = 0;
 812                 ccap->bounds.width = frame->wWidth;
 813                 ccap->bounds.height = frame->wHeight;
 814
 815                 ccap->defrect = ccap->bounds;
 816
 817                 ccap->pixelaspect.numerator = 1;
 818                 ccap->pixelaspect.denominator = 1;
 819                 break;
 820         }
 821
 822         case VIDIOC_G_CROP:
 823         case VIDIOC_S_CROP:
 824                 return -EINVAL;
 825
 826         /* Buffers & streaming */
 827         case VIDIOC_REQBUFS:
 828         {
 829                 struct v4l2_requestbuffers *rb = arg;
 830                 unsigned int bufsize =
 831                         video->streaming->ctrl.dwMaxVideoFrameSize;
 832
 833                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 834                     rb->memory != V4L2_MEMORY_MMAP)
 835                         return -EINVAL;
 836
 837                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 838                         return ret;
 839
 840                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
 841                 if (ret < 0)
 842                         return ret;
 843
 844                 rb->count = ret;
 845                 ret = 0;
 846                 break;
 847         }
 848
 849         case VIDIOC_QUERYBUF:
 850         {
 851                 struct v4l2_buffer *buf = arg;
 852
 853                 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 854                         return -EINVAL;
 855
 856                 if (!uvc_has_privileges(handle))
 857                         return -EBUSY;
 858
 859                 return uvc_query_buffer(&video->queue, buf);
 860         }
 861
 862         case VIDIOC_QBUF:
 863                 if (!uvc_has_privileges(handle))
 864                         return -EBUSY;
 865
 866                 return uvc_queue_buffer(&video->queue, arg);
 867
 868         case VIDIOC_DQBUF:
 869                 if (!uvc_has_privileges(handle))
 870                         return -EBUSY;
 871
 872                 return uvc_dequeue_buffer(&video->queue, arg,
 873                         file->f_flags & O_NONBLOCK);
 874
 875         case VIDIOC_STREAMON:
 876         {
 877                 int *type = arg;
 878
 879                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 880                         return -EINVAL;
 881
 882                 if (!uvc_has_privileges(handle))
 883                         return -EBUSY;
 884
 885                 if ((ret = uvc_video_enable(video, 1)) < 0)
 886                         return ret;
 887                 break;
 888         }
 889
 890         case VIDIOC_STREAMOFF:
 891         {
 892                 int *type = arg;
 893
 894                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 895                         return -EINVAL;
 896
 897                 if (!uvc_has_privileges(handle))
 898                         return -EBUSY;
 899
 900                 return uvc_video_enable(video, 0);
 901         }
 902
 903         /* Analog video standards make no sense for digital cameras. */
 904         case VIDIOC_ENUMSTD:
 905         case VIDIOC_QUERYSTD:
 906         case VIDIOC_G_STD:
 907         case VIDIOC_S_STD:
 908
 909         case VIDIOC_OVERLAY:
 910
 911         case VIDIOC_ENUMAUDIO:
 912         case VIDIOC_ENUMAUDOUT:
 913
 914         case VIDIOC_ENUMOUTPUT:
 915                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 916                 return -EINVAL;
 917
 918         /* Dynamic controls. */
 919         case UVCIOC_CTRL_ADD:
 920         {
 921                 struct uvc_xu_control_info *xinfo = arg;
 922                 struct uvc_control_info *info;
 923
 924                 if (!capable(CAP_SYS_ADMIN))
 925                         return -EPERM;
 926
 927                 info = kmalloc(sizeof *info, GFP_KERNEL);
 928                 if (info == NULL)
 929                         return -ENOMEM;
 930
 931                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 932                 info->index = xinfo->index;
 933                 info->selector = xinfo->selector;
 934                 info->size = xinfo->size;
 935                 info->flags = xinfo->flags;
 936
 937                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 938                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 939
 940                 ret = uvc_ctrl_add_info(info);
 941                 if (ret < 0)
 942                         kfree(info);
 943                 break;
 944         }
 945
 946         case UVCIOC_CTRL_MAP:
 947         {
 948                 struct uvc_xu_control_mapping *xmap = arg;
 949                 struct uvc_control_mapping *map;
 950
 951                 if (!capable(CAP_SYS_ADMIN))
 952                         return -EPERM;
 953
 954                 map = kmalloc(sizeof *map, GFP_KERNEL);
 955                 if (map == NULL)
 956                         return -ENOMEM;
 957
 958                 map->id = xmap->id;
 959                 memcpy(map->name, xmap->name, sizeof map->name);
 960                 memcpy(map->entity, xmap->entity, sizeof map->entity);
 961                 map->selector = xmap->selector;
 962                 map->size = xmap->size;
 963                 map->offset = xmap->offset;
 964                 map->v4l2_type = xmap->v4l2_type;
 965                 map->data_type = xmap->data_type;
 966
 967                 ret = uvc_ctrl_add_mapping(map);
 968                 if (ret < 0)
 969                         kfree(map);
 970                 break;
 971         }
 972
 973         case UVCIOC_CTRL_GET:
 974                 return uvc_xu_ctrl_query(video, arg, 0);
 975
 976         case UVCIOC_CTRL_SET:
 977                 return uvc_xu_ctrl_query(video, arg, 1);
 978
 979         default:
 980                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
 981                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
 982                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
 983                                   cmd);
 984                 return ret;
 985         }
 986
 987         return ret;
 988 }
 989
 990 static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
 991                      unsigned int cmd, unsigned long arg)
 992 {
 993         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
 994         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
 995 }
 996
 997 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
 998                     size_t count, loff_t *ppos)
 999 {
1000         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1001         return -ENODEV;
1002 }
1003
1004 /*
1005  * VMA operations.
1006  */
1007 static void uvc_vm_open(struct vm_area_struct *vma)
1008 {
1009         struct uvc_buffer *buffer = vma->vm_private_data;
1010         buffer->vma_use_count++;
1011 }
1012
1013 static void uvc_vm_close(struct vm_area_struct *vma)
1014 {
1015         struct uvc_buffer *buffer = vma->vm_private_data;
1016         buffer->vma_use_count--;
1017 }
1018
1019 static struct vm_operations_struct uvc_vm_ops = {
1020         .open           = uvc_vm_open,
1021         .close          = uvc_vm_close,
1022 };
1023
1024 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1025 {
1026         struct uvc_video_device *video = video_drvdata(file);
1027         struct uvc_buffer *uninitialized_var(buffer);
1028         struct page *page;
1029         unsigned long addr, start, size;
1030         unsigned int i;
1031         int ret = 0;
1032
1033         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1034
1035         start = vma->vm_start;
1036         size = vma->vm_end - vma->vm_start;
1037
1038         mutex_lock(&video->queue.mutex);
1039
1040         for (i = 0; i < video->queue.count; ++i) {
1041                 buffer = &video->queue.buffer[i];
1042                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1043                         break;
1044         }
1045
1046         if (i == video->queue.count || size != video->queue.buf_size) {
1047                 ret = -EINVAL;
1048                 goto done;
1049         }
1050
1051         /*
1052          * VM_IO marks the area as being an mmaped region for I/O to a
1053          * device. It also prevents the region from being core dumped.
1054          */
1055         vma->vm_flags |= VM_IO;
1056
1057         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1058         while (size > 0) {
1059                 page = vmalloc_to_page((void *)addr);
1060                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1061                         goto done;
1062
1063                 start += PAGE_SIZE;
1064                 addr += PAGE_SIZE;
1065                 size -= PAGE_SIZE;
1066         }
1067
1068         vma->vm_ops = &uvc_vm_ops;
1069         vma->vm_private_data = buffer;
1070         uvc_vm_open(vma);
1071
1072 done:
1073         mutex_unlock(&video->queue.mutex);
1074         return ret;
1075 }
1076
1077 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1078 {
1079         struct uvc_video_device *video = video_drvdata(file);
1080
1081         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1082
1083         return uvc_queue_poll(&video->queue, file, wait);
1084 }
1085
1086 struct file_operations uvc_fops = {
1087         .owner          = THIS_MODULE,
1088         .open           = uvc_v4l2_open,
1089         .release        = uvc_v4l2_release,
1090         .ioctl          = uvc_v4l2_ioctl,
1091         .compat_ioctl   = v4l_compat_ioctl32,
1092         .llseek         = no_llseek,
1093         .read           = uvc_v4l2_read,
1094         .mmap           = uvc_v4l2_mmap,
1095         .poll           = uvc_v4l2_poll,
1096 };
1097