drivers/media/video/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2009
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/version.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/mm.h>
  23 #include <linux/wait.h>
  24 #include <asm/atomic.h>
  25
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-ioctl.h>
  28
  29 #include "uvcvideo.h"
  30
  31 /* ------------------------------------------------------------------------
  32  * UVC ioctls
  33  */
  34 static int uvc_ioctl_ctrl_map(struct uvc_xu_control_mapping *xmap, int old)
  35 {
  36         struct uvc_control_mapping *map;
  37         unsigned int size;
  38         int ret;
  39
  40         map = kzalloc(sizeof *map, GFP_KERNEL);
  41         if (map == NULL)
  42                 return -ENOMEM;
  43
  44         map->id = xmap->id;
  45         memcpy(map->name, xmap->name, sizeof map->name);
  46         memcpy(map->entity, xmap->entity, sizeof map->entity);
  47         map->selector = xmap->selector;
  48         map->size = xmap->size;
  49         map->offset = xmap->offset;
  50         map->v4l2_type = xmap->v4l2_type;
  51         map->data_type = xmap->data_type;
  52
  53         switch (xmap->v4l2_type) {
  54         case V4L2_CTRL_TYPE_INTEGER:
  55         case V4L2_CTRL_TYPE_BOOLEAN:
  56         case V4L2_CTRL_TYPE_BUTTON:
  57                 break;
  58
  59         case V4L2_CTRL_TYPE_MENU:
  60                 if (old) {
  61                         ret = -EINVAL;
  62                         goto done;
  63                 }
  64
  65                 size = xmap->menu_count * sizeof(*map->menu_info);
  66                 map->menu_info = kmalloc(size, GFP_KERNEL);
  67                 if (map->menu_info == NULL) {
  68                         ret = -ENOMEM;
  69                         goto done;
  70                 }
  71
  72                 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
  73                         ret = -EFAULT;
  74                         goto done;
  75                 }
  76
  77                 map->menu_count = xmap->menu_count;
  78                 break;
  79
  80         default:
  81                 ret = -EINVAL;
  82                 goto done;
  83         }
  84
  85         ret = uvc_ctrl_add_mapping(map);
  86
  87 done:
  88         if (ret < 0) {
  89                 kfree(map->menu_info);
  90                 kfree(map);
  91         }
  92
  93         return ret;
  94 }
  95
  96 /* ------------------------------------------------------------------------
  97  * V4L2 interface
  98  */
  99
 100 /*
 101  * Mapping V4L2 controls to UVC controls can be straighforward if done well.
 102  * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
 103  * must be grouped (for instance the Red Balance, Blue Balance and Do White
 104  * Balance V4L2 controls use the White Balance Component UVC control) or
 105  * otherwise translated. The approach we take here is to use a translation
 106  * table for the controls that can be mapped directly, and handle the others
 107  * manually.
 108  */
 109 static int uvc_v4l2_query_menu(struct uvc_video_chain *chain,
 110         struct v4l2_querymenu *query_menu)
 111 {
 112         struct uvc_menu_info *menu_info;
 113         struct uvc_control_mapping *mapping;
 114         struct uvc_control *ctrl;
 115         u32 index = query_menu->index;
 116         u32 id = query_menu->id;
 117
 118         ctrl = uvc_find_control(chain, query_menu->id, &mapping);
 119         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
 120                 return -EINVAL;
 121
 122         if (query_menu->index >= mapping->menu_count)
 123                 return -EINVAL;
 124
 125         memset(query_menu, 0, sizeof(*query_menu));
 126         query_menu->id = id;
 127         query_menu->index = index;
 128
 129         menu_info = &mapping->menu_info[query_menu->index];
 130         strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
 131         return 0;
 132 }
 133
 134 /*
 135  * Find the frame interval closest to the requested frame interval for the
 136  * given frame format and size. This should be done by the device as part of
 137  * the Video Probe and Commit negotiation, but some hardware don't implement
 138  * that feature.
 139  */
 140 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
 141 {
 142         unsigned int i;
 143
 144         if (frame->bFrameIntervalType) {
 145                 __u32 best = -1, dist;
 146
 147                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 148                         dist = interval > frame->dwFrameInterval[i]
 149                              ? interval - frame->dwFrameInterval[i]
 150                              : frame->dwFrameInterval[i] - interval;
 151
 152                         if (dist > best)
 153                                 break;
 154
 155                         best = dist;
 156                 }
 157
 158                 interval = frame->dwFrameInterval[i-1];
 159         } else {
 160                 const __u32 min = frame->dwFrameInterval[0];
 161                 const __u32 max = frame->dwFrameInterval[1];
 162                 const __u32 step = frame->dwFrameInterval[2];
 163
 164                 interval = min + (interval - min + step/2) / step * step;
 165                 if (interval > max)
 166                         interval = max;
 167         }
 168
 169         return interval;
 170 }
 171
 172 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 173         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 174         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 175 {
 176         struct uvc_format *format = NULL;
 177         struct uvc_frame *frame = NULL;
 178         __u16 rw, rh;
 179         unsigned int d, maxd;
 180         unsigned int i;
 181         __u32 interval;
 182         int ret = 0;
 183         __u8 *fcc;
 184
 185         if (fmt->type != stream->type)
 186                 return -EINVAL;
 187
 188         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 189         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 190                         fmt->fmt.pix.pixelformat,
 191                         fcc[0], fcc[1], fcc[2], fcc[3],
 192                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 193
 194         /* Check if the hardware supports the requested format. */
 195         for (i = 0; i < stream->nformats; ++i) {
 196                 format = &stream->format[i];
 197                 if (format->fcc == fmt->fmt.pix.pixelformat)
 198                         break;
 199         }
 200
 201         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
 202                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
 203                                 fmt->fmt.pix.pixelformat);
 204                 return -EINVAL;
 205         }
 206
 207         /* Find the closest image size. The distance between image sizes is
 208          * the size in pixels of the non-overlapping regions between the
 209          * requested size and the frame-specified size.
 210          */
 211         rw = fmt->fmt.pix.width;
 212         rh = fmt->fmt.pix.height;
 213         maxd = (unsigned int)-1;
 214
 215         for (i = 0; i < format->nframes; ++i) {
 216                 __u16 w = format->frame[i].wWidth;
 217                 __u16 h = format->frame[i].wHeight;
 218
 219                 d = min(w, rw) * min(h, rh);
 220                 d = w*h + rw*rh - 2*d;
 221                 if (d < maxd) {
 222                         maxd = d;
 223                         frame = &format->frame[i];
 224                 }
 225
 226                 if (maxd == 0)
 227                         break;
 228         }
 229
 230         if (frame == NULL) {
 231                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 232                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 233                 return -EINVAL;
 234         }
 235
 236         /* Use the default frame interval. */
 237         interval = frame->dwDefaultFrameInterval;
 238         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 239                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 240                 (100000000/interval)%10);
 241
 242         /* Set the format index, frame index and frame interval. */
 243         memset(probe, 0, sizeof *probe);
 244         probe->bmHint = 1;      /* dwFrameInterval */
 245         probe->bFormatIndex = format->index;
 246         probe->bFrameIndex = frame->bFrameIndex;
 247         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 248         /* Some webcams stall the probe control set request when the
 249          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 250          * clearly states that the field is read-only from the host, so this
 251          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 252          * the webcam to work around the problem.
 253          *
 254          * The workaround could probably be enabled for all webcams, so the
 255          * quirk can be removed if needed. It's currently useful to detect
 256          * webcam bugs and fix them before they hit the market (providing
 257          * developers test their webcams with the Linux driver as well as with
 258          * the Windows driver).
 259          */
 260         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 261                 probe->dwMaxVideoFrameSize =
 262                         stream->ctrl.dwMaxVideoFrameSize;
 263
 264         /* Probe the device. */
 265         ret = uvc_probe_video(stream, probe);
 266         if (ret < 0)
 267                 goto done;
 268
 269         fmt->fmt.pix.width = frame->wWidth;
 270         fmt->fmt.pix.height = frame->wHeight;
 271         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 272         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 273         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 274         fmt->fmt.pix.colorspace = format->colorspace;
 275         fmt->fmt.pix.priv = 0;
 276
 277         if (uvc_format != NULL)
 278                 *uvc_format = format;
 279         if (uvc_frame != NULL)
 280                 *uvc_frame = frame;
 281
 282 done:
 283         return ret;
 284 }
 285
 286 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 287         struct v4l2_format *fmt)
 288 {
 289         struct uvc_format *format = stream->cur_format;
 290         struct uvc_frame *frame = stream->cur_frame;
 291
 292         if (fmt->type != stream->type)
 293                 return -EINVAL;
 294
 295         if (format == NULL || frame == NULL)
 296                 return -EINVAL;
 297
 298         fmt->fmt.pix.pixelformat = format->fcc;
 299         fmt->fmt.pix.width = frame->wWidth;
 300         fmt->fmt.pix.height = frame->wHeight;
 301         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 302         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 303         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 304         fmt->fmt.pix.colorspace = format->colorspace;
 305         fmt->fmt.pix.priv = 0;
 306
 307         return 0;
 308 }
 309
 310 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 311         struct v4l2_format *fmt)
 312 {
 313         struct uvc_streaming_control probe;
 314         struct uvc_format *format;
 315         struct uvc_frame *frame;
 316         int ret;
 317
 318         if (fmt->type != stream->type) {
 319         printk("uvc_v4l2_set_format, fmt->type(%d) != stream->type(%d)\n",fmt->type,stream->type);
 320                 return -EINVAL;
 321         }
 322
 323         if (uvc_queue_allocated(&stream->queue)) {
 324         printk("uvc_queue_allocated failed\n");
 325                 return -EBUSY;
 326
 327         }
 328
 329         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 330         if (ret < 0)
 331                 return ret;
 332
 333         memcpy(&stream->ctrl, &probe, sizeof probe);
 334         stream->cur_format = format;
 335         stream->cur_frame = frame;
 336
 337         return 0;
 338 }
 339
 340 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 341                 struct v4l2_streamparm *parm)
 342 {
 343         uint32_t numerator, denominator;
 344
 345         if (parm->type != stream->type)
 346                 return -EINVAL;
 347
 348         numerator = stream->ctrl.dwFrameInterval;
 349         denominator = 10000000;
 350         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 351
 352         memset(parm, 0, sizeof *parm);
 353         parm->type = stream->type;
 354
 355         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 356                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 357                 parm->parm.capture.capturemode = 0;
 358                 parm->parm.capture.timeperframe.numerator = numerator;
 359                 parm->parm.capture.timeperframe.denominator = denominator;
 360                 parm->parm.capture.extendedmode = 0;
 361                 parm->parm.capture.readbuffers = 0;
 362         } else {
 363                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 364                 parm->parm.output.outputmode = 0;
 365                 parm->parm.output.timeperframe.numerator = numerator;
 366                 parm->parm.output.timeperframe.denominator = denominator;
 367         }
 368
 369         return 0;
 370 }
 371
 372 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 373                 struct v4l2_streamparm *parm)
 374 {
 375         struct uvc_frame *frame = stream->cur_frame;
 376         struct uvc_streaming_control probe;
 377         struct v4l2_fract timeperframe;
 378         uint32_t interval;
 379         int ret;
 380
 381         if (parm->type != stream->type)
 382                 return -EINVAL;
 383
 384         if (uvc_queue_streaming(&stream->queue))
 385                 return -EBUSY;
 386
 387         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 388                 timeperframe = parm->parm.capture.timeperframe;
 389         else
 390                 timeperframe = parm->parm.output.timeperframe;
 391
 392         memcpy(&probe, &stream->ctrl, sizeof probe);
 393         interval = uvc_fraction_to_interval(timeperframe.numerator,
 394                 timeperframe.denominator);
 395
 396         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 397                 timeperframe.numerator, timeperframe.denominator, interval);
 398         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 399
 400         /* Probe the device with the new settings. */
 401         ret = uvc_probe_video(stream, &probe);
 402         if (ret < 0)
 403                 return ret;
 404
 405         memcpy(&stream->ctrl, &probe, sizeof probe);
 406
 407         /* Return the actual frame period. */
 408         timeperframe.numerator = probe.dwFrameInterval;
 409         timeperframe.denominator = 10000000;
 410         uvc_simplify_fraction(&timeperframe.numerator,
 411                 &timeperframe.denominator, 8, 333);
 412
 413         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 414                 parm->parm.capture.timeperframe = timeperframe;
 415         else
 416                 parm->parm.output.timeperframe = timeperframe;
 417
 418         return 0;
 419 }
 420
 421 /* ------------------------------------------------------------------------
 422  * Privilege management
 423  */
 424
 425 /*
 426  * Privilege management is the multiple-open implementation basis. The current
 427  * implementation is completely transparent for the end-user and doesn't
 428  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 429  * Those ioctls enable finer control on the device (by making possible for a
 430  * user to request exclusive access to a device), but are not mature yet.
 431  * Switching to the V4L2 priority mechanism might be considered in the future
 432  * if this situation changes.
 433  *
 434  * Each open instance of a UVC device can either be in a privileged or
 435  * unprivileged state. Only a single instance can be in a privileged state at
 436  * a given time. Trying to perform an operation that requires privileges will
 437  * automatically acquire the required privileges if possible, or return -EBUSY
 438  * otherwise. Privileges are dismissed when closing the instance or when
 439  * freeing the video buffers using VIDIOC_REQBUFS.
 440  *
 441  * Operations that require privileges are:
 442  *
 443  * - VIDIOC_S_INPUT
 444  * - VIDIOC_S_PARM
 445  * - VIDIOC_S_FMT
 446  * - VIDIOC_REQBUFS
 447  */
 448 static int uvc_acquire_privileges(struct uvc_fh *handle)
 449 {
 450         /* Always succeed if the handle is already privileged. */
 451         if (handle->state == UVC_HANDLE_ACTIVE)
 452                 return 0;
 453
 454         /* Check if the device already has a privileged handle. */
 455         if (atomic_inc_return(&handle->stream->active) != 1) {
 456                 atomic_dec(&handle->stream->active);
 457                 return -EBUSY;
 458         }
 459
 460         handle->state = UVC_HANDLE_ACTIVE;
 461         return 0;
 462 }
 463
 464 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 465 {
 466         if (handle->state == UVC_HANDLE_ACTIVE)
 467                 atomic_dec(&handle->stream->active);
 468
 469         handle->state = UVC_HANDLE_PASSIVE;
 470 }
 471
 472 static int uvc_has_privileges(struct uvc_fh *handle)
 473 {
 474         return handle->state == UVC_HANDLE_ACTIVE;
 475 }
 476
 477 /* ------------------------------------------------------------------------
 478  * V4L2 file operations
 479  */
 480
 481 static int uvc_v4l2_open(struct file *file)
 482 {
 483         struct uvc_streaming *stream;
 484         struct uvc_fh *handle;
 485         int ret = 0;
 486
 487         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 488         stream = video_drvdata(file);
 489
 490         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 491                 return -ENODEV;
 492
 493         ret = usb_autopm_get_interface(stream->dev->intf);
 494         if (ret < 0)
 495                 return ret;
 496
 497         /* Create the device handle. */
 498         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 499         if (handle == NULL) {
 500                 usb_autopm_put_interface(stream->dev->intf);
 501                 return -ENOMEM;
 502         }
 503
 504         if (atomic_inc_return(&stream->dev->users) == 1) {
 505                 ret = uvc_status_start(stream->dev);
 506                 if (ret < 0) {
 507                         usb_autopm_put_interface(stream->dev->intf);
 508                         atomic_dec(&stream->dev->users);
 509                         kfree(handle);
 510                         return ret;
 511                 }
 512         }
 513
 514         handle->chain = stream->chain;
 515         handle->stream = stream;
 516         handle->state = UVC_HANDLE_PASSIVE;
 517         file->private_data = handle;
 518
 519         return 0;
 520 }
 521
 522 static int uvc_v4l2_release(struct file *file)
 523 {
 524         struct uvc_fh *handle = file->private_data;
 525         struct uvc_streaming *stream = handle->stream;
 526
 527         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 528
 529         /* Only free resources if this is a privileged handle. */
 530         if (uvc_has_privileges(handle)) {
 531                 uvc_video_enable(stream, 0);
 532
 533                 mutex_lock(&stream->queue.mutex);
 534                 if (uvc_free_buffers(&stream->queue) < 0)
 535                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 536                                         "free buffers.\n");
 537                 mutex_unlock(&stream->queue.mutex);
 538         }
 539
 540         /* Release the file handle. */
 541         uvc_dismiss_privileges(handle);
 542         kfree(handle);
 543         file->private_data = NULL;
 544
 545         if (atomic_dec_return(&stream->dev->users) == 0)
 546                 uvc_status_stop(stream->dev);
 547
 548         usb_autopm_put_interface(stream->dev->intf);
 549         return 0;
 550 }
 551
 552 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 553 {
 554         struct video_device *vdev = video_devdata(file);
 555         struct uvc_fh *handle = file->private_data;
 556         struct uvc_video_chain *chain = handle->chain;
 557         struct uvc_streaming *stream = handle->stream;
 558         long ret = 0;
 559
 560         switch (cmd) {
 561         /* Query capabilities */
 562         case VIDIOC_QUERYCAP:
 563         {
 564                 struct v4l2_capability *cap = arg;
 565
 566                 memset(cap, 0, sizeof *cap);
 567                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 568                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 569                 usb_make_path(stream->dev->udev,
 570                               cap->bus_info, sizeof(cap->bus_info));
 571                 cap->version = DRIVER_VERSION_NUMBER;
 572                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 573                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 574                                           | V4L2_CAP_STREAMING;
 575                 else
 576                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
 577                                           | V4L2_CAP_STREAMING;
 578                 break;
 579         }
 580
 581         /* Get, Set & Query control */
 582         case VIDIOC_QUERYCTRL:
 583                 return uvc_query_v4l2_ctrl(chain, arg);
 584
 585         case VIDIOC_G_CTRL:
 586         {
 587                 struct v4l2_control *ctrl = arg;
 588                 struct v4l2_ext_control xctrl;
 589
 590                 memset(&xctrl, 0, sizeof xctrl);
 591                 xctrl.id = ctrl->id;
 592
 593                 ret = uvc_ctrl_begin(chain);
 594                 if (ret < 0)
 595                         return ret;
 596
 597                 ret = uvc_ctrl_get(chain, &xctrl);
 598                 uvc_ctrl_rollback(chain);
 599                 if (ret >= 0)
 600                         ctrl->value = xctrl.value;
 601                 break;
 602         }
 603
 604         case VIDIOC_S_CTRL:
 605         {
 606                 struct v4l2_control *ctrl = arg;
 607                 struct v4l2_ext_control xctrl;
 608
 609                 memset(&xctrl, 0, sizeof xctrl);
 610                 xctrl.id = ctrl->id;
 611                 xctrl.value = ctrl->value;
 612
 613                 ret = uvc_ctrl_begin(chain);
 614                 if (ret < 0)
 615                         return ret;
 616
 617                 ret = uvc_ctrl_set(chain, &xctrl);
 618                 if (ret < 0) {
 619                         uvc_ctrl_rollback(chain);
 620                         return ret;
 621                 }
 622                 ret = uvc_ctrl_commit(chain);
 623                 if (ret == 0)
 624                         ctrl->value = xctrl.value;
 625                 break;
 626         }
 627
 628         case VIDIOC_QUERYMENU:
 629                 return uvc_v4l2_query_menu(chain, arg);
 630
 631         case VIDIOC_G_EXT_CTRLS:
 632         {
 633                 struct v4l2_ext_controls *ctrls = arg;
 634                 struct v4l2_ext_control *ctrl = ctrls->controls;
 635                 unsigned int i;
 636
 637                 ret = uvc_ctrl_begin(chain);
 638                 if (ret < 0)
 639                         return ret;
 640
 641                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 642                         ret = uvc_ctrl_get(chain, ctrl);
 643                         if (ret < 0) {
 644                                 uvc_ctrl_rollback(chain);
 645                                 ctrls->error_idx = i;
 646                                 return ret;
 647                         }
 648                 }
 649                 ctrls->error_idx = 0;
 650                 ret = uvc_ctrl_rollback(chain);
 651                 break;
 652         }
 653
 654         case VIDIOC_S_EXT_CTRLS:
 655         case VIDIOC_TRY_EXT_CTRLS:
 656         {
 657                 struct v4l2_ext_controls *ctrls = arg;
 658                 struct v4l2_ext_control *ctrl = ctrls->controls;
 659                 unsigned int i;
 660
 661                 ret = uvc_ctrl_begin(chain);
 662                 if (ret < 0)
 663                         return ret;
 664
 665                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 666                         ret = uvc_ctrl_set(chain, ctrl);
 667                         if (ret < 0) {
 668                                 uvc_ctrl_rollback(chain);
 669                                 ctrls->error_idx = i;
 670                                 return ret;
 671                         }
 672                 }
 673
 674                 ctrls->error_idx = 0;
 675
 676                 if (cmd == VIDIOC_S_EXT_CTRLS)
 677                         ret = uvc_ctrl_commit(chain);
 678                 else
 679                         ret = uvc_ctrl_rollback(chain);
 680                 break;
 681         }
 682
 683         /* Get, Set & Enum input */
 684         case VIDIOC_ENUMINPUT:
 685         {
 686                 const struct uvc_entity *selector = chain->selector;
 687                 struct v4l2_input *input = arg;
 688                 struct uvc_entity *iterm = NULL;
 689                 u32 index = input->index;
 690                 int pin = 0;
 691
 692                 if (selector == NULL ||
 693                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 694                         if (index != 0)
 695                                 return -EINVAL;
 696                         list_for_each_entry(iterm, &chain->entities, chain) {
 697                                 if (UVC_ENTITY_IS_ITERM(iterm))
 698                                         break;
 699                         }
 700                         pin = iterm->id;
 701                 } else if (pin < selector->bNrInPins) {
 702                         pin = selector->baSourceID[index];
 703                         list_for_each_entry(iterm, &chain->entities, chain) {
 704                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 705                                         continue;
 706                                 if (iterm->id == pin)
 707                                         break;
 708                         }
 709                 }
 710
 711                 if (iterm == NULL || iterm->id != pin)
 712                         return -EINVAL;
 713
 714                 memset(input, 0, sizeof *input);
 715                 input->index = index;
 716                 strlcpy(input->name, iterm->name, sizeof input->name);
 717                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 718                         input->type = V4L2_INPUT_TYPE_CAMERA;
 719                 break;
 720         }
 721
 722         case VIDIOC_G_INPUT:
 723         {
 724                 u8 input;
 725
 726                 if (chain->selector == NULL ||
 727                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 728                         *(int *)arg = 0;
 729                         break;
 730                 }
 731
 732                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 733                         chain->selector->id, chain->dev->intfnum,
 734                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 735                 if (ret < 0)
 736                         return ret;
 737
 738                 *(int *)arg = input - 1;
 739                 break;
 740         }
 741
 742         case VIDIOC_S_INPUT:
 743         {
 744                 u32 input = *(u32 *)arg + 1;
 745
 746                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 747                         return ret;
 748
 749                 if (chain->selector == NULL ||
 750                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 751                         if (input != 1)
 752                                 return -EINVAL;
 753                         break;
 754                 }
 755
 756                 if (input == 0 || input > chain->selector->bNrInPins)
 757                         return -EINVAL;
 758
 759                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 760                         chain->selector->id, chain->dev->intfnum,
 761                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 762         }
 763
 764         /* Try, Get, Set & Enum format */
 765         case VIDIOC_ENUM_FMT:
 766         {
 767                 struct v4l2_fmtdesc *fmt = arg;
 768                 struct uvc_format *format;
 769                 enum v4l2_buf_type type = fmt->type;
 770                 __u32 index = fmt->index;
 771
 772                 if (fmt->type != stream->type ||
 773                     fmt->index >= stream->nformats)
 774                         return -EINVAL;
 775
 776                 memset(fmt, 0, sizeof(*fmt));
 777                 fmt->index = index;
 778                 fmt->type = type;
 779
 780                 format = &stream->format[fmt->index];
 781                 fmt->flags = 0;
 782                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 783                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 784                 strlcpy(fmt->description, format->name,
 785                         sizeof fmt->description);
 786                 fmt->description[sizeof fmt->description - 1] = 0;
 787                 fmt->pixelformat = format->fcc;
 788                 break;
 789         }
 790
 791         case VIDIOC_TRY_FMT:
 792         {
 793                 struct uvc_streaming_control probe;
 794
 795                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 796         }
 797
 798         case VIDIOC_S_FMT:
 799                 if ((ret = uvc_acquire_privileges(handle)) < 0) {
 800             printk("uvc_acquire_privileges error.");
 801                         return ret;
 802                 }
 803
 804                 return uvc_v4l2_set_format(stream, arg);
 805
 806         case VIDIOC_G_FMT:
 807                 return uvc_v4l2_get_format(stream, arg);
 808
 809         /* Frame size enumeration */
 810         case VIDIOC_ENUM_FRAMESIZES:
 811         {
 812                 struct v4l2_frmsizeenum *fsize = arg;
 813                 struct uvc_format *format = NULL;
 814                 struct uvc_frame *frame;
 815                 int i;
 816
 817                 /* Look for the given pixel format */
 818                 for (i = 0; i < stream->nformats; i++) {
 819                         if (stream->format[i].fcc ==
 820                                         fsize->pixel_format) {
 821                                 format = &stream->format[i];
 822                                 break;
 823                         }
 824                 }
 825                 if (format == NULL)
 826                         return -EINVAL;
 827
 828                 if (fsize->index >= format->nframes)
 829                         return -EINVAL;
 830
 831                 frame = &format->frame[fsize->index];
 832                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 833                 fsize->discrete.width = frame->wWidth;
 834                 fsize->discrete.height = frame->wHeight;
 835                 break;
 836         }
 837
 838         /* Frame interval enumeration */
 839         case VIDIOC_ENUM_FRAMEINTERVALS:
 840         {
 841                 struct v4l2_frmivalenum *fival = arg;
 842                 struct uvc_format *format = NULL;
 843                 struct uvc_frame *frame = NULL;
 844                 int i;
 845
 846                 /* Look for the given pixel format and frame size */
 847                 for (i = 0; i < stream->nformats; i++) {
 848                         if (stream->format[i].fcc ==
 849                                         fival->pixel_format) {
 850                                 format = &stream->format[i];
 851                                 break;
 852                         }
 853                 }
 854                 if (format == NULL)
 855                         return -EINVAL;
 856
 857                 for (i = 0; i < format->nframes; i++) {
 858                         if (format->frame[i].wWidth == fival->width &&
 859                             format->frame[i].wHeight == fival->height) {
 860                                 frame = &format->frame[i];
 861                                 break;
 862                         }
 863                 }
 864                 if (frame == NULL)
 865                         return -EINVAL;
 866
 867                 if (frame->bFrameIntervalType) {
 868                         if (fival->index >= frame->bFrameIntervalType)
 869                                 return -EINVAL;
 870
 871                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 872                         fival->discrete.numerator =
 873                                 frame->dwFrameInterval[fival->index];
 874                         fival->discrete.denominator = 10000000;
 875                         uvc_simplify_fraction(&fival->discrete.numerator,
 876                                 &fival->discrete.denominator, 8, 333);
 877                 } else {
 878                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 879                         fival->stepwise.min.numerator =
 880                                 frame->dwFrameInterval[0];
 881                         fival->stepwise.min.denominator = 10000000;
 882                         fival->stepwise.max.numerator =
 883                                 frame->dwFrameInterval[1];
 884                         fival->stepwise.max.denominator = 10000000;
 885                         fival->stepwise.step.numerator =
 886                                 frame->dwFrameInterval[2];
 887                         fival->stepwise.step.denominator = 10000000;
 888                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 889                                 &fival->stepwise.min.denominator, 8, 333);
 890                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 891                                 &fival->stepwise.max.denominator, 8, 333);
 892                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 893                                 &fival->stepwise.step.denominator, 8, 333);
 894                 }
 895                 break;
 896         }
 897
 898         /* Get & Set streaming parameters */
 899         case VIDIOC_G_PARM:
 900                 return uvc_v4l2_get_streamparm(stream, arg);
 901
 902         case VIDIOC_S_PARM:
 903                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 904                         return ret;
 905
 906                 return uvc_v4l2_set_streamparm(stream, arg);
 907
 908         /* Cropping and scaling */
 909         case VIDIOC_CROPCAP:
 910         {
 911                 struct v4l2_cropcap *ccap = arg;
 912                 struct uvc_frame *frame = stream->cur_frame;
 913
 914                 if (ccap->type != stream->type)
 915                         return -EINVAL;
 916
 917                 ccap->bounds.left = 0;
 918                 ccap->bounds.top = 0;
 919                 ccap->bounds.width = frame->wWidth;
 920                 ccap->bounds.height = frame->wHeight;
 921
 922                 ccap->defrect = ccap->bounds;
 923
 924                 ccap->pixelaspect.numerator = 1;
 925                 ccap->pixelaspect.denominator = 1;
 926                 break;
 927         }
 928
 929         case VIDIOC_G_CROP:
 930         case VIDIOC_S_CROP:
 931                 return -EINVAL;
 932
 933         /* Buffers & streaming */
 934         case VIDIOC_REQBUFS:
 935         {
 936                 struct v4l2_requestbuffers *rb = arg;
 937                 unsigned int bufsize =
 938                         stream->ctrl.dwMaxVideoFrameSize;
 939
 940                 if (rb->type != stream->type ||
 941                     rb->memory != V4L2_MEMORY_MMAP)
 942                         return -EINVAL;
 943
 944                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 945                         return ret;
 946
 947                 ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize);
 948                 if (ret < 0)
 949                         return ret;
 950
 951                 if (ret == 0)
 952                         uvc_dismiss_privileges(handle);
 953
 954                 rb->count = ret;
 955                 ret = 0;
 956                 break;
 957         }
 958
 959         case VIDIOC_QUERYBUF:
 960         {
 961                 struct v4l2_buffer *buf = arg;
 962
 963                 if (buf->type != stream->type)
 964                         return -EINVAL;
 965
 966                 if (!uvc_has_privileges(handle))
 967                         return -EBUSY;
 968
 969                 return uvc_query_buffer(&stream->queue, buf);
 970         }
 971
 972         case VIDIOC_QBUF:
 973                 if (!uvc_has_privileges(handle)) {
 974             printk("uvcvideo: VIDIOC_QBUF uvc_has_privileges failed\n");
 975                         return -EBUSY;
 976                 }
 977
 978                 return uvc_queue_buffer(&stream->queue, arg);
 979
 980         case VIDIOC_DQBUF:
 981                 if (!uvc_has_privileges(handle)) {
 982             printk("uvcvideo: VIDIOC_DQBUF uvc_has_privileges failed\n");
 983                         return -EBUSY;
 984                 }
 985
 986                 return uvc_dequeue_buffer(&stream->queue, arg,
 987                         file->f_flags & O_NONBLOCK);
 988
 989         case VIDIOC_STREAMON:
 990         {
 991                 int *type = arg;
 992
 993                 if (*type != stream->type)
 994                         return -EINVAL;
 995
 996                 if (!uvc_has_privileges(handle))
 997                         return -EBUSY;
 998
 999                 ret = uvc_video_enable(stream, 1);
1000                 if (ret < 0)
1001                         return ret;
1002                 break;
1003         }
1004
1005         case VIDIOC_STREAMOFF:
1006         {
1007                 int *type = arg;
1008
1009                 if (*type != stream->type)
1010                         return -EINVAL;
1011
1012                 if (!uvc_has_privileges(handle))
1013                         return -EBUSY;
1014
1015                 return uvc_video_enable(stream, 0);
1016         }
1017
1018         /* Analog video standards make no sense for digital cameras. */
1019         case VIDIOC_ENUMSTD:
1020         case VIDIOC_QUERYSTD:
1021         case VIDIOC_G_STD:
1022         case VIDIOC_S_STD:
1023
1024         case VIDIOC_OVERLAY:
1025
1026         case VIDIOC_ENUMAUDIO:
1027         case VIDIOC_ENUMAUDOUT:
1028
1029         case VIDIOC_ENUMOUTPUT:
1030                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1031                 return -EINVAL;
1032
1033         /* Dynamic controls. */
1034         case UVCIOC_CTRL_ADD:
1035         {
1036                 struct uvc_xu_control_info *xinfo = arg;
1037                 struct uvc_control_info *info;
1038
1039                 if (!capable(CAP_SYS_ADMIN))
1040                         return -EPERM;
1041
1042                 if (xinfo->size == 0)
1043                         return -EINVAL;
1044
1045                 info = kzalloc(sizeof *info, GFP_KERNEL);
1046                 if (info == NULL)
1047                         return -ENOMEM;
1048
1049                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
1050                 info->index = xinfo->index;
1051                 info->selector = xinfo->selector;
1052                 info->size = xinfo->size;
1053                 info->flags = xinfo->flags;
1054
1055                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
1056                                UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF |
1057                                UVC_CONTROL_EXTENSION;
1058
1059                 ret = uvc_ctrl_add_info(info);
1060                 if (ret < 0)
1061                         kfree(info);
1062                 break;
1063         }
1064
1065         case UVCIOC_CTRL_MAP_OLD:
1066         case UVCIOC_CTRL_MAP:
1067                 if (!capable(CAP_SYS_ADMIN))
1068                         return -EPERM;
1069
1070                 return uvc_ioctl_ctrl_map(arg, cmd == UVCIOC_CTRL_MAP_OLD);
1071
1072         case UVCIOC_CTRL_GET:
1073                 return uvc_xu_ctrl_query(chain, arg, 0);
1074
1075         case UVCIOC_CTRL_SET:
1076                 return uvc_xu_ctrl_query(chain, arg, 1);
1077
1078         default:
1079                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1080                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1081                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1082                                   cmd);
1083                 return ret;
1084         }
1085
1086         return ret;
1087 }
1088
1089 static long uvc_v4l2_ioctl(struct file *file,
1090                      unsigned int cmd, unsigned long arg)
1091 {
1092         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1093                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1094                 v4l_printk_ioctl(cmd);
1095                 printk(")\n");
1096         }
1097
1098         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1099 }
1100
1101 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1102                     size_t count, loff_t *ppos)
1103 {
1104         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1105         return -EINVAL;
1106 }
1107
1108 /*
1109  * VMA operations.
1110  */
1111 static void uvc_vm_open(struct vm_area_struct *vma)
1112 {
1113         struct uvc_buffer *buffer = vma->vm_private_data;
1114         buffer->vma_use_count++;
1115 }
1116
1117 static void uvc_vm_close(struct vm_area_struct *vma)
1118 {
1119         struct uvc_buffer *buffer = vma->vm_private_data;
1120         buffer->vma_use_count--;
1121 }
1122
1123 static const struct vm_operations_struct uvc_vm_ops = {
1124         .open           = uvc_vm_open,
1125         .close          = uvc_vm_close,
1126 };
1127
1128 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1129 {
1130         struct uvc_fh *handle = file->private_data;
1131         struct uvc_streaming *stream = handle->stream;
1132         struct uvc_video_queue *queue = &stream->queue;
1133         struct uvc_buffer *uninitialized_var(buffer);
1134         struct page *page;
1135         unsigned long addr, start, size;
1136         unsigned int i;
1137         int ret = 0;
1138
1139         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1140
1141         start = vma->vm_start;
1142         size = vma->vm_end - vma->vm_start;
1143
1144         mutex_lock(&queue->mutex);
1145
1146         for (i = 0; i < queue->count; ++i) {
1147                 buffer = &queue->buffer[i];
1148                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1149                         break;
1150         }
1151
1152         if (i == queue->count || size != queue->buf_size) {
1153                 ret = -EINVAL;
1154                 goto done;
1155         }
1156
1157         /*
1158          * VM_IO marks the area as being an mmaped region for I/O to a
1159          * device. It also prevents the region from being core dumped.
1160          */
1161         vma->vm_flags |= VM_IO;
1162
1163         addr = (unsigned long)queue->mem + buffer->buf.m.offset;
1164         while (size > 0) {
1165                 page = vmalloc_to_page((void *)addr);
1166                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1167                         goto done;
1168
1169                 start += PAGE_SIZE;
1170                 addr += PAGE_SIZE;
1171                 size -= PAGE_SIZE;
1172         }
1173
1174         vma->vm_ops = &uvc_vm_ops;
1175         vma->vm_private_data = buffer;
1176         uvc_vm_open(vma);
1177
1178 done:
1179         mutex_unlock(&queue->mutex);
1180         return ret;
1181 }
1182
1183 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1184 {
1185         struct uvc_fh *handle = file->private_data;
1186         struct uvc_streaming *stream = handle->stream;
1187
1188         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1189
1190         return uvc_queue_poll(&stream->queue, file, wait);
1191 }
1192
1193 const struct v4l2_file_operations uvc_fops = {
1194         .owner          = THIS_MODULE,
1195         .open           = uvc_v4l2_open,
1196         .release        = uvc_v4l2_release,
1197         .ioctl          = uvc_v4l2_ioctl,
1198         .read           = uvc_v4l2_read,
1199         .mmap           = uvc_v4l2_mmap,
1200         .poll           = uvc_v4l2_poll,
1201 };
1202