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 video_device *vdev;
 404         struct uvc_video_device *video;
 405         struct uvc_fh *handle;
 406         int ret = 0;
 407
 408         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 409         mutex_lock(&uvc_driver.open_mutex);
 410         vdev = video_devdata(file);
 411         video = video_get_drvdata(vdev);
 412
 413         if (video->dev->state & UVC_DEV_DISCONNECTED) {
 414                 ret = -ENODEV;
 415                 goto done;
 416         }
 417
 418         ret = usb_autopm_get_interface(video->dev->intf);
 419         if (ret < 0)
 420                 goto done;
 421
 422         /* Create the device handle. */
 423         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 424         if (handle == NULL) {
 425                 usb_autopm_put_interface(video->dev->intf);
 426                 ret = -ENOMEM;
 427                 goto done;
 428         }
 429
 430         handle->device = video;
 431         handle->state = UVC_HANDLE_PASSIVE;
 432         file->private_data = handle;
 433
 434         kref_get(&video->dev->kref);
 435
 436 done:
 437         mutex_unlock(&uvc_driver.open_mutex);
 438         return ret;
 439 }
 440
 441 static int uvc_v4l2_release(struct inode *inode, struct file *file)
 442 {
 443         struct video_device *vdev = video_devdata(file);
 444         struct uvc_video_device *video = video_get_drvdata(vdev);
 445         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 446
 447         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 448
 449         /* Only free resources if this is a privileged handle. */
 450         if (uvc_has_privileges(handle)) {
 451                 uvc_video_enable(video, 0);
 452
 453                 mutex_lock(&video->queue.mutex);
 454                 if (uvc_free_buffers(&video->queue) < 0)
 455                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 456                                         "free buffers.\n");
 457                 mutex_unlock(&video->queue.mutex);
 458         }
 459
 460         /* Release the file handle. */
 461         uvc_dismiss_privileges(handle);
 462         kfree(handle);
 463         file->private_data = NULL;
 464
 465         usb_autopm_put_interface(video->dev->intf);
 466         kref_put(&video->dev->kref, uvc_delete);
 467         return 0;
 468 }
 469
 470 static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
 471                      unsigned int cmd, void *arg)
 472 {
 473         struct video_device *vdev = video_devdata(file);
 474         struct uvc_video_device *video = video_get_drvdata(vdev);
 475         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 476         int ret = 0;
 477
 478         if (uvc_trace_param & UVC_TRACE_IOCTL)
 479                 v4l_printk_ioctl(cmd);
 480
 481         switch (cmd) {
 482         /* Query capabilities */
 483         case VIDIOC_QUERYCAP:
 484         {
 485                 struct v4l2_capability *cap = arg;
 486
 487                 memset(cap, 0, sizeof *cap);
 488                 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
 489                 strncpy(cap->card, vdev->name, 32);
 490                 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
 491                         sizeof cap->bus_info);
 492                 cap->version = DRIVER_VERSION_NUMBER;
 493                 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 494                                   | V4L2_CAP_STREAMING;
 495                 break;
 496         }
 497
 498         /* Get, Set & Query control */
 499         case VIDIOC_QUERYCTRL:
 500                 return uvc_query_v4l2_ctrl(video, arg);
 501
 502         case VIDIOC_G_CTRL:
 503         {
 504                 struct v4l2_control *ctrl = arg;
 505                 struct v4l2_ext_control xctrl;
 506
 507                 memset(&xctrl, 0, sizeof xctrl);
 508                 xctrl.id = ctrl->id;
 509
 510                 uvc_ctrl_begin(video);
 511                 ret = uvc_ctrl_get(video, &xctrl);
 512                 uvc_ctrl_rollback(video);
 513                 if (ret >= 0)
 514                         ctrl->value = xctrl.value;
 515                 break;
 516         }
 517
 518         case VIDIOC_S_CTRL:
 519         {
 520                 struct v4l2_control *ctrl = arg;
 521                 struct v4l2_ext_control xctrl;
 522
 523                 memset(&xctrl, 0, sizeof xctrl);
 524                 xctrl.id = ctrl->id;
 525                 xctrl.value = ctrl->value;
 526
 527                 uvc_ctrl_begin(video);
 528                 ret = uvc_ctrl_set(video, &xctrl);
 529                 if (ret < 0) {
 530                         uvc_ctrl_rollback(video);
 531                         return ret;
 532                 }
 533                 ret = uvc_ctrl_commit(video);
 534                 break;
 535         }
 536
 537         case VIDIOC_QUERYMENU:
 538                 return uvc_v4l2_query_menu(video, arg);
 539
 540         case VIDIOC_G_EXT_CTRLS:
 541         {
 542                 struct v4l2_ext_controls *ctrls = arg;
 543                 struct v4l2_ext_control *ctrl = ctrls->controls;
 544                 unsigned int i;
 545
 546                 uvc_ctrl_begin(video);
 547                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 548                         ret = uvc_ctrl_get(video, ctrl);
 549                         if (ret < 0) {
 550                                 uvc_ctrl_rollback(video);
 551                                 ctrls->error_idx = i;
 552                                 return ret;
 553                         }
 554                 }
 555                 ctrls->error_idx = 0;
 556                 ret = uvc_ctrl_rollback(video);
 557                 break;
 558         }
 559
 560         case VIDIOC_S_EXT_CTRLS:
 561         case VIDIOC_TRY_EXT_CTRLS:
 562         {
 563                 struct v4l2_ext_controls *ctrls = arg;
 564                 struct v4l2_ext_control *ctrl = ctrls->controls;
 565                 unsigned int i;
 566
 567                 ret = uvc_ctrl_begin(video);
 568                 if (ret < 0)
 569                         return ret;
 570
 571                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 572                         ret = uvc_ctrl_set(video, ctrl);
 573                         if (ret < 0) {
 574                                 uvc_ctrl_rollback(video);
 575                                 ctrls->error_idx = i;
 576                                 return ret;
 577                         }
 578                 }
 579
 580                 ctrls->error_idx = 0;
 581
 582                 if (cmd == VIDIOC_S_EXT_CTRLS)
 583                         ret = uvc_ctrl_commit(video);
 584                 else
 585                         ret = uvc_ctrl_rollback(video);
 586                 break;
 587         }
 588
 589         /* Get, Set & Enum input */
 590         case VIDIOC_ENUMINPUT:
 591         {
 592                 const struct uvc_entity *selector = video->selector;
 593                 struct v4l2_input *input = arg;
 594                 struct uvc_entity *iterm = NULL;
 595                 u32 index = input->index;
 596                 int pin = 0;
 597
 598                 if (selector == NULL ||
 599                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 600                         if (index != 0)
 601                                 return -EINVAL;
 602                         iterm = list_first_entry(&video->iterms,
 603                                         struct uvc_entity, chain);
 604                         pin = iterm->id;
 605                 } else if (pin < selector->selector.bNrInPins) {
 606                         pin = selector->selector.baSourceID[index];
 607                         list_for_each_entry(iterm, video->iterms.next, chain) {
 608                                 if (iterm->id == pin)
 609                                         break;
 610                         }
 611                 }
 612
 613                 if (iterm == NULL || iterm->id != pin)
 614                         return -EINVAL;
 615
 616                 memset(input, 0, sizeof *input);
 617                 input->index = index;
 618                 strncpy(input->name, iterm->name, sizeof input->name);
 619                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 620                         input->type = V4L2_INPUT_TYPE_CAMERA;
 621                 break;
 622         }
 623
 624         case VIDIOC_G_INPUT:
 625         {
 626                 u8 input;
 627
 628                 if (video->selector == NULL ||
 629                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 630                         *(int *)arg = 0;
 631                         break;
 632                 }
 633
 634                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
 635                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 636                         &input, 1);
 637                 if (ret < 0)
 638                         return ret;
 639
 640                 *(int *)arg = input - 1;
 641                 break;
 642         }
 643
 644         case VIDIOC_S_INPUT:
 645         {
 646                 u8 input = *(u32 *)arg + 1;
 647
 648                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 649                         return ret;
 650
 651                 if (video->selector == NULL ||
 652                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 653                         if (input != 1)
 654                                 return -EINVAL;
 655                         break;
 656                 }
 657
 658                 if (input > video->selector->selector.bNrInPins)
 659                         return -EINVAL;
 660
 661                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
 662                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 663                         &input, 1);
 664         }
 665
 666         /* Try, Get, Set & Enum format */
 667         case VIDIOC_ENUM_FMT:
 668         {
 669                 struct v4l2_fmtdesc *fmt = arg;
 670                 struct uvc_format *format;
 671
 672                 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 673                     fmt->index >= video->streaming->nformats)
 674                         return -EINVAL;
 675
 676                 format = &video->streaming->format[fmt->index];
 677                 fmt->flags = 0;
 678                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 679                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 680                 strncpy(fmt->description, format->name,
 681                         sizeof fmt->description);
 682                 fmt->description[sizeof fmt->description - 1] = 0;
 683                 fmt->pixelformat = format->fcc;
 684                 break;
 685         }
 686
 687         case VIDIOC_TRY_FMT:
 688         {
 689                 struct uvc_streaming_control probe;
 690
 691                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 692                         return ret;
 693
 694                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
 695         }
 696
 697         case VIDIOC_S_FMT:
 698                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 699                         return ret;
 700
 701                 return uvc_v4l2_set_format(video, arg);
 702
 703         case VIDIOC_G_FMT:
 704                 return uvc_v4l2_get_format(video, arg);
 705
 706         /* Frame size enumeration */
 707         case VIDIOC_ENUM_FRAMESIZES:
 708         {
 709                 struct v4l2_frmsizeenum *fsize = arg;
 710                 struct uvc_format *format = NULL;
 711                 struct uvc_frame *frame;
 712                 int i;
 713
 714                 /* Look for the given pixel format */
 715                 for (i = 0; i < video->streaming->nformats; i++) {
 716                         if (video->streaming->format[i].fcc ==
 717                                         fsize->pixel_format) {
 718                                 format = &video->streaming->format[i];
 719                                 break;
 720                         }
 721                 }
 722                 if (format == NULL)
 723                         return -EINVAL;
 724
 725                 if (fsize->index >= format->nframes)
 726                         return -EINVAL;
 727
 728                 frame = &format->frame[fsize->index];
 729                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 730                 fsize->discrete.width = frame->wWidth;
 731                 fsize->discrete.height = frame->wHeight;
 732                 break;
 733         }
 734
 735         /* Frame interval enumeration */
 736         case VIDIOC_ENUM_FRAMEINTERVALS:
 737         {
 738                 struct v4l2_frmivalenum *fival = arg;
 739                 struct uvc_format *format = NULL;
 740                 struct uvc_frame *frame = NULL;
 741                 int i;
 742
 743                 /* Look for the given pixel format and frame size */
 744                 for (i = 0; i < video->streaming->nformats; i++) {
 745                         if (video->streaming->format[i].fcc ==
 746                                         fival->pixel_format) {
 747                                 format = &video->streaming->format[i];
 748                                 break;
 749                         }
 750                 }
 751                 if (format == NULL)
 752                         return -EINVAL;
 753
 754                 for (i = 0; i < format->nframes; i++) {
 755                         if (format->frame[i].wWidth == fival->width &&
 756                             format->frame[i].wHeight == fival->height) {
 757                                 frame = &format->frame[i];
 758                                 break;
 759                         }
 760                 }
 761                 if (frame == NULL)
 762                         return -EINVAL;
 763
 764                 if (frame->bFrameIntervalType) {
 765                         if (fival->index >= frame->bFrameIntervalType)
 766                                 return -EINVAL;
 767
 768                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 769                         fival->discrete.numerator =
 770                                 frame->dwFrameInterval[fival->index];
 771                         fival->discrete.denominator = 10000000;
 772                         uvc_simplify_fraction(&fival->discrete.numerator,
 773                                 &fival->discrete.denominator, 8, 333);
 774                 } else {
 775                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 776                         fival->stepwise.min.numerator =
 777                                 frame->dwFrameInterval[0];
 778                         fival->stepwise.min.denominator = 10000000;
 779                         fival->stepwise.max.numerator =
 780                                 frame->dwFrameInterval[1];
 781                         fival->stepwise.max.denominator = 10000000;
 782                         fival->stepwise.step.numerator =
 783                                 frame->dwFrameInterval[2];
 784                         fival->stepwise.step.denominator = 10000000;
 785                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 786                                 &fival->stepwise.min.denominator, 8, 333);
 787                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 788                                 &fival->stepwise.max.denominator, 8, 333);
 789                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 790                                 &fival->stepwise.step.denominator, 8, 333);
 791                 }
 792                 break;
 793         }
 794
 795         /* Get & Set streaming parameters */
 796         case VIDIOC_G_PARM:
 797                 return uvc_v4l2_get_streamparm(video, arg);
 798
 799         case VIDIOC_S_PARM:
 800                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 801                         return ret;
 802
 803                 return uvc_v4l2_set_streamparm(video, arg);
 804
 805         /* Cropping and scaling */
 806         case VIDIOC_CROPCAP:
 807         {
 808                 struct v4l2_cropcap *ccap = arg;
 809                 struct uvc_frame *frame = video->streaming->cur_frame;
 810
 811                 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 812                         return -EINVAL;
 813
 814                 ccap->bounds.left = 0;
 815                 ccap->bounds.top = 0;
 816                 ccap->bounds.width = frame->wWidth;
 817                 ccap->bounds.height = frame->wHeight;
 818
 819                 ccap->defrect = ccap->bounds;
 820
 821                 ccap->pixelaspect.numerator = 1;
 822                 ccap->pixelaspect.denominator = 1;
 823                 break;
 824         }
 825
 826         case VIDIOC_G_CROP:
 827         case VIDIOC_S_CROP:
 828                 return -EINVAL;
 829
 830         /* Buffers & streaming */
 831         case VIDIOC_REQBUFS:
 832         {
 833                 struct v4l2_requestbuffers *rb = arg;
 834                 unsigned int bufsize =
 835                         video->streaming->ctrl.dwMaxVideoFrameSize;
 836
 837                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 838                     rb->memory != V4L2_MEMORY_MMAP)
 839                         return -EINVAL;
 840
 841                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 842                         return ret;
 843
 844                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
 845                 if (ret < 0)
 846                         return ret;
 847
 848                 if (!(video->streaming->cur_format->flags &
 849                     UVC_FMT_FLAG_COMPRESSED))
 850                         video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
 851
 852                 rb->count = ret;
 853                 ret = 0;
 854                 break;
 855         }
 856
 857         case VIDIOC_QUERYBUF:
 858         {
 859                 struct v4l2_buffer *buf = arg;
 860
 861                 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 862                         return -EINVAL;
 863
 864                 if (!uvc_has_privileges(handle))
 865                         return -EBUSY;
 866
 867                 return uvc_query_buffer(&video->queue, buf);
 868         }
 869
 870         case VIDIOC_QBUF:
 871                 if (!uvc_has_privileges(handle))
 872                         return -EBUSY;
 873
 874                 return uvc_queue_buffer(&video->queue, arg);
 875
 876         case VIDIOC_DQBUF:
 877                 if (!uvc_has_privileges(handle))
 878                         return -EBUSY;
 879
 880                 return uvc_dequeue_buffer(&video->queue, arg,
 881                         file->f_flags & O_NONBLOCK);
 882
 883         case VIDIOC_STREAMON:
 884         {
 885                 int *type = arg;
 886
 887                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 888                         return -EINVAL;
 889
 890                 if (!uvc_has_privileges(handle))
 891                         return -EBUSY;
 892
 893                 if ((ret = uvc_video_enable(video, 1)) < 0)
 894                         return ret;
 895                 break;
 896         }
 897
 898         case VIDIOC_STREAMOFF:
 899         {
 900                 int *type = arg;
 901
 902                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 903                         return -EINVAL;
 904
 905                 if (!uvc_has_privileges(handle))
 906                         return -EBUSY;
 907
 908                 return uvc_video_enable(video, 0);
 909         }
 910
 911         /* Analog video standards make no sense for digital cameras. */
 912         case VIDIOC_ENUMSTD:
 913         case VIDIOC_QUERYSTD:
 914         case VIDIOC_G_STD:
 915         case VIDIOC_S_STD:
 916
 917         case VIDIOC_OVERLAY:
 918
 919         case VIDIOC_ENUMAUDIO:
 920         case VIDIOC_ENUMAUDOUT:
 921
 922         case VIDIOC_ENUMOUTPUT:
 923                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 924                 return -EINVAL;
 925
 926         /* Dynamic controls. */
 927         case UVCIOC_CTRL_ADD:
 928         {
 929                 struct uvc_xu_control_info *xinfo = arg;
 930                 struct uvc_control_info *info;
 931
 932                 if (!capable(CAP_SYS_ADMIN))
 933                         return -EPERM;
 934
 935                 info = kmalloc(sizeof *info, GFP_KERNEL);
 936                 if (info == NULL)
 937                         return -ENOMEM;
 938
 939                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 940                 info->index = xinfo->index;
 941                 info->selector = xinfo->selector;
 942                 info->size = xinfo->size;
 943                 info->flags = xinfo->flags;
 944
 945                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 946                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 947
 948                 ret = uvc_ctrl_add_info(info);
 949                 if (ret < 0)
 950                         kfree(info);
 951                 break;
 952         }
 953
 954         case UVCIOC_CTRL_MAP:
 955         {
 956                 struct uvc_xu_control_mapping *xmap = arg;
 957                 struct uvc_control_mapping *map;
 958
 959                 if (!capable(CAP_SYS_ADMIN))
 960                         return -EPERM;
 961
 962                 map = kmalloc(sizeof *map, GFP_KERNEL);
 963                 if (map == NULL)
 964                         return -ENOMEM;
 965
 966                 map->id = xmap->id;
 967                 memcpy(map->name, xmap->name, sizeof map->name);
 968                 memcpy(map->entity, xmap->entity, sizeof map->entity);
 969                 map->selector = xmap->selector;
 970                 map->size = xmap->size;
 971                 map->offset = xmap->offset;
 972                 map->v4l2_type = xmap->v4l2_type;
 973                 map->data_type = xmap->data_type;
 974
 975                 ret = uvc_ctrl_add_mapping(map);
 976                 if (ret < 0)
 977                         kfree(map);
 978                 break;
 979         }
 980
 981         case UVCIOC_CTRL_GET:
 982                 return uvc_xu_ctrl_query(video, arg, 0);
 983
 984         case UVCIOC_CTRL_SET:
 985                 return uvc_xu_ctrl_query(video, arg, 1);
 986
 987         default:
 988                 if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
 989                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
 990                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
 991                                   cmd);
 992                 return ret;
 993         }
 994
 995         return ret;
 996 }
 997
 998 static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
 999                      unsigned int cmd, unsigned long arg)
1000 {
1001         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
1002         return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
1003 }
1004
1005 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1006                     size_t count, loff_t *ppos)
1007 {
1008         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1009         return -ENODEV;
1010 }
1011
1012 /*
1013  * VMA operations.
1014  */
1015 static void uvc_vm_open(struct vm_area_struct *vma)
1016 {
1017         struct uvc_buffer *buffer = vma->vm_private_data;
1018         buffer->vma_use_count++;
1019 }
1020
1021 static void uvc_vm_close(struct vm_area_struct *vma)
1022 {
1023         struct uvc_buffer *buffer = vma->vm_private_data;
1024         buffer->vma_use_count--;
1025 }
1026
1027 static struct vm_operations_struct uvc_vm_ops = {
1028         .open           = uvc_vm_open,
1029         .close          = uvc_vm_close,
1030 };
1031
1032 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1033 {
1034         struct video_device *vdev = video_devdata(file);
1035         struct uvc_video_device *video = video_get_drvdata(vdev);
1036         struct uvc_buffer *uninitialized_var(buffer);
1037         struct page *page;
1038         unsigned long addr, start, size;
1039         unsigned int i;
1040         int ret = 0;
1041
1042         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1043
1044         start = vma->vm_start;
1045         size = vma->vm_end - vma->vm_start;
1046
1047         mutex_lock(&video->queue.mutex);
1048
1049         for (i = 0; i < video->queue.count; ++i) {
1050                 buffer = &video->queue.buffer[i];
1051                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1052                         break;
1053         }
1054
1055         if (i == video->queue.count || size != video->queue.buf_size) {
1056                 ret = -EINVAL;
1057                 goto done;
1058         }
1059
1060         /*
1061          * VM_IO marks the area as being an mmaped region for I/O to a
1062          * device. It also prevents the region from being core dumped.
1063          */
1064         vma->vm_flags |= VM_IO;
1065
1066         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1067         while (size > 0) {
1068                 page = vmalloc_to_page((void *)addr);
1069                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1070                         goto done;
1071
1072                 start += PAGE_SIZE;
1073                 addr += PAGE_SIZE;
1074                 size -= PAGE_SIZE;
1075         }
1076
1077         vma->vm_ops = &uvc_vm_ops;
1078         vma->vm_private_data = buffer;
1079         uvc_vm_open(vma);
1080
1081 done:
1082         mutex_unlock(&video->queue.mutex);
1083         return ret;
1084 }
1085
1086 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1087 {
1088         struct video_device *vdev = video_devdata(file);
1089         struct uvc_video_device *video = video_get_drvdata(vdev);
1090
1091         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1092
1093         return uvc_queue_poll(&video->queue, file, wait);
1094 }
1095
1096 struct file_operations uvc_fops = {
1097         .owner          = THIS_MODULE,
1098         .open           = uvc_v4l2_open,
1099         .release        = uvc_v4l2_release,
1100         .ioctl          = uvc_v4l2_ioctl,
1101         .compat_ioctl   = v4l_compat_ioctl32,
1102         .llseek         = no_llseek,
1103         .read           = uvc_v4l2_read,
1104         .mmap           = uvc_v4l2_mmap,
1105         .poll           = uvc_v4l2_poll,
1106 };
1107