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                 return -EINVAL;
 320
 321         if (uvc_queue_allocated(&stream->queue))
 322                 return -EBUSY;
 323
 324         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 325         if (ret < 0)
 326                 return ret;
 327
 328         memcpy(&stream->ctrl, &probe, sizeof probe);
 329         stream->cur_format = format;
 330         stream->cur_frame = frame;
 331
 332         return 0;
 333 }
 334
 335 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 336                 struct v4l2_streamparm *parm)
 337 {
 338         uint32_t numerator, denominator;
 339
 340         if (parm->type != stream->type)
 341                 return -EINVAL;
 342
 343         numerator = stream->ctrl.dwFrameInterval;
 344         denominator = 10000000;
 345         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 346
 347         memset(parm, 0, sizeof *parm);
 348         parm->type = stream->type;
 349
 350         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 351                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 352                 parm->parm.capture.capturemode = 0;
 353                 parm->parm.capture.timeperframe.numerator = numerator;
 354                 parm->parm.capture.timeperframe.denominator = denominator;
 355                 parm->parm.capture.extendedmode = 0;
 356                 parm->parm.capture.readbuffers = 0;
 357         } else {
 358                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 359                 parm->parm.output.outputmode = 0;
 360                 parm->parm.output.timeperframe.numerator = numerator;
 361                 parm->parm.output.timeperframe.denominator = denominator;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 368                 struct v4l2_streamparm *parm)
 369 {
 370         struct uvc_frame *frame = stream->cur_frame;
 371         struct uvc_streaming_control probe;
 372         struct v4l2_fract timeperframe;
 373         uint32_t interval;
 374         int ret;
 375
 376         if (parm->type != stream->type)
 377                 return -EINVAL;
 378
 379         if (uvc_queue_streaming(&stream->queue))
 380                 return -EBUSY;
 381
 382         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 383                 timeperframe = parm->parm.capture.timeperframe;
 384         else
 385                 timeperframe = parm->parm.output.timeperframe;
 386
 387         memcpy(&probe, &stream->ctrl, sizeof probe);
 388         interval = uvc_fraction_to_interval(timeperframe.numerator,
 389                 timeperframe.denominator);
 390
 391         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 392                 timeperframe.numerator, timeperframe.denominator, interval);
 393         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 394
 395         /* Probe the device with the new settings. */
 396         ret = uvc_probe_video(stream, &probe);
 397         if (ret < 0)
 398                 return ret;
 399
 400         memcpy(&stream->ctrl, &probe, sizeof probe);
 401
 402         /* Return the actual frame period. */
 403         timeperframe.numerator = probe.dwFrameInterval;
 404         timeperframe.denominator = 10000000;
 405         uvc_simplify_fraction(&timeperframe.numerator,
 406                 &timeperframe.denominator, 8, 333);
 407
 408         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 409                 parm->parm.capture.timeperframe = timeperframe;
 410         else
 411                 parm->parm.output.timeperframe = timeperframe;
 412
 413         return 0;
 414 }
 415
 416 /* ------------------------------------------------------------------------
 417  * Privilege management
 418  */
 419
 420 /*
 421  * Privilege management is the multiple-open implementation basis. The current
 422  * implementation is completely transparent for the end-user and doesn't
 423  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 424  * Those ioctls enable finer control on the device (by making possible for a
 425  * user to request exclusive access to a device), but are not mature yet.
 426  * Switching to the V4L2 priority mechanism might be considered in the future
 427  * if this situation changes.
 428  *
 429  * Each open instance of a UVC device can either be in a privileged or
 430  * unprivileged state. Only a single instance can be in a privileged state at
 431  * a given time. Trying to perform an operation that requires privileges will
 432  * automatically acquire the required privileges if possible, or return -EBUSY
 433  * otherwise. Privileges are dismissed when closing the instance or when
 434  * freeing the video buffers using VIDIOC_REQBUFS.
 435  *
 436  * Operations that require privileges are:
 437  *
 438  * - VIDIOC_S_INPUT
 439  * - VIDIOC_S_PARM
 440  * - VIDIOC_S_FMT
 441  * - VIDIOC_REQBUFS
 442  */
 443 static int uvc_acquire_privileges(struct uvc_fh *handle)
 444 {
 445         /* Always succeed if the handle is already privileged. */
 446         if (handle->state == UVC_HANDLE_ACTIVE)
 447                 return 0;
 448
 449         /* Check if the device already has a privileged handle. */
 450         if (atomic_inc_return(&handle->stream->active) != 1) {
 451                 atomic_dec(&handle->stream->active);
 452                 return -EBUSY;
 453         }
 454
 455         handle->state = UVC_HANDLE_ACTIVE;
 456         return 0;
 457 }
 458
 459 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 460 {
 461         if (handle->state == UVC_HANDLE_ACTIVE)
 462                 atomic_dec(&handle->stream->active);
 463
 464         handle->state = UVC_HANDLE_PASSIVE;
 465 }
 466
 467 static int uvc_has_privileges(struct uvc_fh *handle)
 468 {
 469         return handle->state == UVC_HANDLE_ACTIVE;
 470 }
 471
 472 /* ------------------------------------------------------------------------
 473  * V4L2 file operations
 474  */
 475
 476 static int uvc_v4l2_open(struct file *file)
 477 {
 478         struct uvc_streaming *stream;
 479         struct uvc_fh *handle;
 480         int ret = 0;
 481
 482         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 483         stream = video_drvdata(file);
 484
 485         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 486                 return -ENODEV;
 487
 488         ret = usb_autopm_get_interface(stream->dev->intf);
 489         if (ret < 0)
 490                 return ret;
 491
 492         /* Create the device handle. */
 493         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 494         if (handle == NULL) {
 495                 usb_autopm_put_interface(stream->dev->intf);
 496                 return -ENOMEM;
 497         }
 498
 499         if (atomic_inc_return(&stream->dev->users) == 1) {
 500                 ret = uvc_status_start(stream->dev);
 501                 if (ret < 0) {
 502                         usb_autopm_put_interface(stream->dev->intf);
 503                         atomic_dec(&stream->dev->users);
 504                         kfree(handle);
 505                         return ret;
 506                 }
 507         }
 508
 509         handle->chain = stream->chain;
 510         handle->stream = stream;
 511         handle->state = UVC_HANDLE_PASSIVE;
 512         file->private_data = handle;
 513
 514         return 0;
 515 }
 516
 517 static int uvc_v4l2_release(struct file *file)
 518 {
 519         struct uvc_fh *handle = file->private_data;
 520         struct uvc_streaming *stream = handle->stream;
 521
 522         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 523
 524         /* Only free resources if this is a privileged handle. */
 525         if (uvc_has_privileges(handle)) {
 526                 uvc_video_enable(stream, 0);
 527
 528                 mutex_lock(&stream->queue.mutex);
 529                 if (uvc_free_buffers(&stream->queue) < 0)
 530                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 531                                         "free buffers.\n");
 532                 mutex_unlock(&stream->queue.mutex);
 533         }
 534
 535         /* Release the file handle. */
 536         uvc_dismiss_privileges(handle);
 537         kfree(handle);
 538         file->private_data = NULL;
 539
 540         if (atomic_dec_return(&stream->dev->users) == 0)
 541                 uvc_status_stop(stream->dev);
 542
 543         usb_autopm_put_interface(stream->dev->intf);
 544         return 0;
 545 }
 546
 547 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 548 {
 549         struct video_device *vdev = video_devdata(file);
 550         struct uvc_fh *handle = file->private_data;
 551         struct uvc_video_chain *chain = handle->chain;
 552         struct uvc_streaming *stream = handle->stream;
 553         long ret = 0;
 554
 555         switch (cmd) {
 556         /* Query capabilities */
 557         case VIDIOC_QUERYCAP:
 558         {
 559                 struct v4l2_capability *cap = arg;
 560
 561                 memset(cap, 0, sizeof *cap);
 562                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 563                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 564                 usb_make_path(stream->dev->udev,
 565                               cap->bus_info, sizeof(cap->bus_info));
 566                 cap->version = DRIVER_VERSION_NUMBER;
 567                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 568                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 569                                           | V4L2_CAP_STREAMING;
 570                 else
 571                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
 572                                           | V4L2_CAP_STREAMING;
 573                 break;
 574         }
 575
 576         /* Get, Set & Query control */
 577         case VIDIOC_QUERYCTRL:
 578                 return uvc_query_v4l2_ctrl(chain, arg);
 579
 580         case VIDIOC_G_CTRL:
 581         {
 582                 struct v4l2_control *ctrl = arg;
 583                 struct v4l2_ext_control xctrl;
 584
 585                 memset(&xctrl, 0, sizeof xctrl);
 586                 xctrl.id = ctrl->id;
 587
 588                 ret = uvc_ctrl_begin(chain);
 589                 if (ret < 0)
 590                         return ret;
 591
 592                 ret = uvc_ctrl_get(chain, &xctrl);
 593                 uvc_ctrl_rollback(chain);
 594                 if (ret >= 0)
 595                         ctrl->value = xctrl.value;
 596                 break;
 597         }
 598
 599         case VIDIOC_S_CTRL:
 600         {
 601                 struct v4l2_control *ctrl = arg;
 602                 struct v4l2_ext_control xctrl;
 603
 604                 memset(&xctrl, 0, sizeof xctrl);
 605                 xctrl.id = ctrl->id;
 606                 xctrl.value = ctrl->value;
 607
 608                 ret = uvc_ctrl_begin(chain);
 609                 if (ret < 0)
 610                         return ret;
 611
 612                 ret = uvc_ctrl_set(chain, &xctrl);
 613                 if (ret < 0) {
 614                         uvc_ctrl_rollback(chain);
 615                         return ret;
 616                 }
 617                 ret = uvc_ctrl_commit(chain);
 618                 if (ret == 0)
 619                         ctrl->value = xctrl.value;
 620                 break;
 621         }
 622
 623         case VIDIOC_QUERYMENU:
 624                 return uvc_v4l2_query_menu(chain, arg);
 625
 626         case VIDIOC_G_EXT_CTRLS:
 627         {
 628                 struct v4l2_ext_controls *ctrls = arg;
 629                 struct v4l2_ext_control *ctrl = ctrls->controls;
 630                 unsigned int i;
 631
 632                 ret = uvc_ctrl_begin(chain);
 633                 if (ret < 0)
 634                         return ret;
 635
 636                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 637                         ret = uvc_ctrl_get(chain, ctrl);
 638                         if (ret < 0) {
 639                                 uvc_ctrl_rollback(chain);
 640                                 ctrls->error_idx = i;
 641                                 return ret;
 642                         }
 643                 }
 644                 ctrls->error_idx = 0;
 645                 ret = uvc_ctrl_rollback(chain);
 646                 break;
 647         }
 648
 649         case VIDIOC_S_EXT_CTRLS:
 650         case VIDIOC_TRY_EXT_CTRLS:
 651         {
 652                 struct v4l2_ext_controls *ctrls = arg;
 653                 struct v4l2_ext_control *ctrl = ctrls->controls;
 654                 unsigned int i;
 655
 656                 ret = uvc_ctrl_begin(chain);
 657                 if (ret < 0)
 658                         return ret;
 659
 660                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 661                         ret = uvc_ctrl_set(chain, ctrl);
 662                         if (ret < 0) {
 663                                 uvc_ctrl_rollback(chain);
 664                                 ctrls->error_idx = i;
 665                                 return ret;
 666                         }
 667                 }
 668
 669                 ctrls->error_idx = 0;
 670
 671                 if (cmd == VIDIOC_S_EXT_CTRLS)
 672                         ret = uvc_ctrl_commit(chain);
 673                 else
 674                         ret = uvc_ctrl_rollback(chain);
 675                 break;
 676         }
 677
 678         /* Get, Set & Enum input */
 679         case VIDIOC_ENUMINPUT:
 680         {
 681                 const struct uvc_entity *selector = chain->selector;
 682                 struct v4l2_input *input = arg;
 683                 struct uvc_entity *iterm = NULL;
 684                 u32 index = input->index;
 685                 int pin = 0;
 686
 687                 if (selector == NULL ||
 688                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 689                         if (index != 0)
 690                                 return -EINVAL;
 691                         list_for_each_entry(iterm, &chain->entities, chain) {
 692                                 if (UVC_ENTITY_IS_ITERM(iterm))
 693                                         break;
 694                         }
 695                         pin = iterm->id;
 696                 } else if (pin < selector->bNrInPins) {
 697                         pin = selector->baSourceID[index];
 698                         list_for_each_entry(iterm, &chain->entities, chain) {
 699                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 700                                         continue;
 701                                 if (iterm->id == pin)
 702                                         break;
 703                         }
 704                 }
 705
 706                 if (iterm == NULL || iterm->id != pin)
 707                         return -EINVAL;
 708
 709                 memset(input, 0, sizeof *input);
 710                 input->index = index;
 711                 strlcpy(input->name, iterm->name, sizeof input->name);
 712                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 713                         input->type = V4L2_INPUT_TYPE_CAMERA;
 714                 break;
 715         }
 716
 717         case VIDIOC_G_INPUT:
 718         {
 719                 u8 input;
 720
 721                 if (chain->selector == NULL ||
 722                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 723                         *(int *)arg = 0;
 724                         break;
 725                 }
 726
 727                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 728                         chain->selector->id, chain->dev->intfnum,
 729                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 730                 if (ret < 0)
 731                         return ret;
 732
 733                 *(int *)arg = input - 1;
 734                 break;
 735         }
 736
 737         case VIDIOC_S_INPUT:
 738         {
 739                 u32 input = *(u32 *)arg + 1;
 740
 741                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 742                         return ret;
 743
 744                 if (chain->selector == NULL ||
 745                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 746                         if (input != 1)
 747                                 return -EINVAL;
 748                         break;
 749                 }
 750
 751                 if (input == 0 || input > chain->selector->bNrInPins)
 752                         return -EINVAL;
 753
 754                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 755                         chain->selector->id, chain->dev->intfnum,
 756                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 757         }
 758
 759         /* Try, Get, Set & Enum format */
 760         case VIDIOC_ENUM_FMT:
 761         {
 762                 struct v4l2_fmtdesc *fmt = arg;
 763                 struct uvc_format *format;
 764                 enum v4l2_buf_type type = fmt->type;
 765                 __u32 index = fmt->index;
 766
 767                 if (fmt->type != stream->type ||
 768                     fmt->index >= stream->nformats)
 769                         return -EINVAL;
 770
 771                 memset(fmt, 0, sizeof(*fmt));
 772                 fmt->index = index;
 773                 fmt->type = type;
 774
 775                 format = &stream->format[fmt->index];
 776                 fmt->flags = 0;
 777                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 778                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 779                 strlcpy(fmt->description, format->name,
 780                         sizeof fmt->description);
 781                 fmt->description[sizeof fmt->description - 1] = 0;
 782                 fmt->pixelformat = format->fcc;
 783                 break;
 784         }
 785
 786         case VIDIOC_TRY_FMT:
 787         {
 788                 struct uvc_streaming_control probe;
 789
 790                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 791         }
 792
 793         case VIDIOC_S_FMT:
 794                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 795                         return ret;
 796
 797                 return uvc_v4l2_set_format(stream, arg);
 798
 799         case VIDIOC_G_FMT:
 800                 return uvc_v4l2_get_format(stream, arg);
 801
 802         /* Frame size enumeration */
 803         case VIDIOC_ENUM_FRAMESIZES:
 804         {
 805                 struct v4l2_frmsizeenum *fsize = arg;
 806                 struct uvc_format *format = NULL;
 807                 struct uvc_frame *frame;
 808                 int i;
 809
 810                 /* Look for the given pixel format */
 811                 for (i = 0; i < stream->nformats; i++) {
 812                         if (stream->format[i].fcc ==
 813                                         fsize->pixel_format) {
 814                                 format = &stream->format[i];
 815                                 break;
 816                         }
 817                 }
 818                 if (format == NULL)
 819                         return -EINVAL;
 820
 821                 if (fsize->index >= format->nframes)
 822                         return -EINVAL;
 823
 824                 frame = &format->frame[fsize->index];
 825                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 826                 fsize->discrete.width = frame->wWidth;
 827                 fsize->discrete.height = frame->wHeight;
 828                 break;
 829         }
 830
 831         /* Frame interval enumeration */
 832         case VIDIOC_ENUM_FRAMEINTERVALS:
 833         {
 834                 struct v4l2_frmivalenum *fival = arg;
 835                 struct uvc_format *format = NULL;
 836                 struct uvc_frame *frame = NULL;
 837                 int i;
 838
 839                 /* Look for the given pixel format and frame size */
 840                 for (i = 0; i < stream->nformats; i++) {
 841                         if (stream->format[i].fcc ==
 842                                         fival->pixel_format) {
 843                                 format = &stream->format[i];
 844                                 break;
 845                         }
 846                 }
 847                 if (format == NULL)
 848                         return -EINVAL;
 849
 850                 for (i = 0; i < format->nframes; i++) {
 851                         if (format->frame[i].wWidth == fival->width &&
 852                             format->frame[i].wHeight == fival->height) {
 853                                 frame = &format->frame[i];
 854                                 break;
 855                         }
 856                 }
 857                 if (frame == NULL)
 858                         return -EINVAL;
 859
 860                 if (frame->bFrameIntervalType) {
 861                         if (fival->index >= frame->bFrameIntervalType)
 862                                 return -EINVAL;
 863
 864                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 865                         fival->discrete.numerator =
 866                                 frame->dwFrameInterval[fival->index];
 867                         fival->discrete.denominator = 10000000;
 868                         uvc_simplify_fraction(&fival->discrete.numerator,
 869                                 &fival->discrete.denominator, 8, 333);
 870                 } else {
 871                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 872                         fival->stepwise.min.numerator =
 873                                 frame->dwFrameInterval[0];
 874                         fival->stepwise.min.denominator = 10000000;
 875                         fival->stepwise.max.numerator =
 876                                 frame->dwFrameInterval[1];
 877                         fival->stepwise.max.denominator = 10000000;
 878                         fival->stepwise.step.numerator =
 879                                 frame->dwFrameInterval[2];
 880                         fival->stepwise.step.denominator = 10000000;
 881                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 882                                 &fival->stepwise.min.denominator, 8, 333);
 883                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 884                                 &fival->stepwise.max.denominator, 8, 333);
 885                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 886                                 &fival->stepwise.step.denominator, 8, 333);
 887                 }
 888                 break;
 889         }
 890
 891         /* Get & Set streaming parameters */
 892         case VIDIOC_G_PARM:
 893                 return uvc_v4l2_get_streamparm(stream, arg);
 894
 895         case VIDIOC_S_PARM:
 896                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 897                         return ret;
 898
 899                 return uvc_v4l2_set_streamparm(stream, arg);
 900
 901         /* Cropping and scaling */
 902         case VIDIOC_CROPCAP:
 903         {
 904                 struct v4l2_cropcap *ccap = arg;
 905                 struct uvc_frame *frame = stream->cur_frame;
 906
 907                 if (ccap->type != stream->type)
 908                         return -EINVAL;
 909
 910                 ccap->bounds.left = 0;
 911                 ccap->bounds.top = 0;
 912                 ccap->bounds.width = frame->wWidth;
 913                 ccap->bounds.height = frame->wHeight;
 914
 915                 ccap->defrect = ccap->bounds;
 916
 917                 ccap->pixelaspect.numerator = 1;
 918                 ccap->pixelaspect.denominator = 1;
 919                 break;
 920         }
 921
 922         case VIDIOC_G_CROP:
 923         case VIDIOC_S_CROP:
 924                 return -EINVAL;
 925
 926         /* Buffers & streaming */
 927         case VIDIOC_REQBUFS:
 928         {
 929                 struct v4l2_requestbuffers *rb = arg;
 930                 unsigned int bufsize =
 931                         stream->ctrl.dwMaxVideoFrameSize;
 932
 933                 if (rb->type != stream->type ||
 934                     rb->memory != V4L2_MEMORY_MMAP)
 935                         return -EINVAL;
 936
 937                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 938                         return ret;
 939
 940                 ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize);
 941                 if (ret < 0)
 942                         return ret;
 943
 944                 if (ret == 0)
 945                         uvc_dismiss_privileges(handle);
 946
 947                 rb->count = ret;
 948                 ret = 0;
 949                 break;
 950         }
 951
 952         case VIDIOC_QUERYBUF:
 953         {
 954                 struct v4l2_buffer *buf = arg;
 955
 956                 if (buf->type != stream->type)
 957                         return -EINVAL;
 958
 959                 if (!uvc_has_privileges(handle))
 960                         return -EBUSY;
 961
 962                 return uvc_query_buffer(&stream->queue, buf);
 963         }
 964
 965         case VIDIOC_QBUF:
 966                 if (!uvc_has_privileges(handle))
 967                         return -EBUSY;
 968
 969                 return uvc_queue_buffer(&stream->queue, arg);
 970
 971         case VIDIOC_DQBUF:
 972                 if (!uvc_has_privileges(handle))
 973                         return -EBUSY;
 974
 975                 return uvc_dequeue_buffer(&stream->queue, arg,
 976                         file->f_flags & O_NONBLOCK);
 977
 978         case VIDIOC_STREAMON:
 979         {
 980                 int *type = arg;
 981
 982                 if (*type != stream->type)
 983                         return -EINVAL;
 984
 985                 if (!uvc_has_privileges(handle))
 986                         return -EBUSY;
 987
 988                 ret = uvc_video_enable(stream, 1);
 989                 if (ret < 0)
 990                         return ret;
 991                 break;
 992         }
 993
 994         case VIDIOC_STREAMOFF:
 995         {
 996                 int *type = arg;
 997
 998                 if (*type != stream->type)
 999                         return -EINVAL;
1000
1001                 if (!uvc_has_privileges(handle))
1002                         return -EBUSY;
1003
1004                 return uvc_video_enable(stream, 0);
1005         }
1006
1007         /* Analog video standards make no sense for digital cameras. */
1008         case VIDIOC_ENUMSTD:
1009         case VIDIOC_QUERYSTD:
1010         case VIDIOC_G_STD:
1011         case VIDIOC_S_STD:
1012
1013         case VIDIOC_OVERLAY:
1014
1015         case VIDIOC_ENUMAUDIO:
1016         case VIDIOC_ENUMAUDOUT:
1017
1018         case VIDIOC_ENUMOUTPUT:
1019                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1020                 return -EINVAL;
1021
1022         /* Dynamic controls. */
1023         case UVCIOC_CTRL_ADD:
1024         {
1025                 struct uvc_xu_control_info *xinfo = arg;
1026                 struct uvc_control_info *info;
1027
1028                 if (!capable(CAP_SYS_ADMIN))
1029                         return -EPERM;
1030
1031                 if (xinfo->size == 0)
1032                         return -EINVAL;
1033
1034                 info = kzalloc(sizeof *info, GFP_KERNEL);
1035                 if (info == NULL)
1036                         return -ENOMEM;
1037
1038                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
1039                 info->index = xinfo->index;
1040                 info->selector = xinfo->selector;
1041                 info->size = xinfo->size;
1042                 info->flags = xinfo->flags;
1043
1044                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
1045                                UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF |
1046                                UVC_CONTROL_EXTENSION;
1047
1048                 ret = uvc_ctrl_add_info(info);
1049                 if (ret < 0)
1050                         kfree(info);
1051                 break;
1052         }
1053
1054         case UVCIOC_CTRL_MAP_OLD:
1055         case UVCIOC_CTRL_MAP:
1056                 if (!capable(CAP_SYS_ADMIN))
1057                         return -EPERM;
1058
1059                 return uvc_ioctl_ctrl_map(arg, cmd == UVCIOC_CTRL_MAP_OLD);
1060
1061         case UVCIOC_CTRL_GET:
1062                 return uvc_xu_ctrl_query(chain, arg, 0);
1063
1064         case UVCIOC_CTRL_SET:
1065                 return uvc_xu_ctrl_query(chain, arg, 1);
1066
1067         default:
1068                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1069                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1070                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1071                                   cmd);
1072                 return ret;
1073         }
1074
1075         return ret;
1076 }
1077
1078 static long uvc_v4l2_ioctl(struct file *file,
1079                      unsigned int cmd, unsigned long arg)
1080 {
1081         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1082                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1083                 v4l_printk_ioctl(cmd);
1084                 printk(")\n");
1085         }
1086
1087         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1088 }
1089
1090 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1091                     size_t count, loff_t *ppos)
1092 {
1093         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1094         return -EINVAL;
1095 }
1096
1097 /*
1098  * VMA operations.
1099  */
1100 static void uvc_vm_open(struct vm_area_struct *vma)
1101 {
1102         struct uvc_buffer *buffer = vma->vm_private_data;
1103         buffer->vma_use_count++;
1104 }
1105
1106 static void uvc_vm_close(struct vm_area_struct *vma)
1107 {
1108         struct uvc_buffer *buffer = vma->vm_private_data;
1109         buffer->vma_use_count--;
1110 }
1111
1112 static const struct vm_operations_struct uvc_vm_ops = {
1113         .open           = uvc_vm_open,
1114         .close          = uvc_vm_close,
1115 };
1116
1117 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1118 {
1119         struct uvc_fh *handle = file->private_data;
1120         struct uvc_streaming *stream = handle->stream;
1121         struct uvc_video_queue *queue = &stream->queue;
1122         struct uvc_buffer *uninitialized_var(buffer);
1123         struct page *page;
1124         unsigned long addr, start, size;
1125         unsigned int i;
1126         int ret = 0;
1127
1128         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1129
1130         start = vma->vm_start;
1131         size = vma->vm_end - vma->vm_start;
1132
1133         mutex_lock(&queue->mutex);
1134
1135         for (i = 0; i < queue->count; ++i) {
1136                 buffer = &queue->buffer[i];
1137                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1138                         break;
1139         }
1140
1141         if (i == queue->count || size != queue->buf_size) {
1142                 ret = -EINVAL;
1143                 goto done;
1144         }
1145
1146         /*
1147          * VM_IO marks the area as being an mmaped region for I/O to a
1148          * device. It also prevents the region from being core dumped.
1149          */
1150         vma->vm_flags |= VM_IO;
1151
1152         addr = (unsigned long)queue->mem + buffer->buf.m.offset;
1153         while (size > 0) {
1154                 page = vmalloc_to_page((void *)addr);
1155                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1156                         goto done;
1157
1158                 start += PAGE_SIZE;
1159                 addr += PAGE_SIZE;
1160                 size -= PAGE_SIZE;
1161         }
1162
1163         vma->vm_ops = &uvc_vm_ops;
1164         vma->vm_private_data = buffer;
1165         uvc_vm_open(vma);
1166
1167 done:
1168         mutex_unlock(&queue->mutex);
1169         return ret;
1170 }
1171
1172 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1173 {
1174         struct uvc_fh *handle = file->private_data;
1175         struct uvc_streaming *stream = handle->stream;
1176
1177         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1178
1179         return uvc_queue_poll(&stream->queue, file, wait);
1180 }
1181
1182 const struct v4l2_file_operations uvc_fops = {
1183         .owner          = THIS_MODULE,
1184         .open           = uvc_v4l2_open,
1185         .release        = uvc_v4l2_release,
1186         .ioctl          = uvc_v4l2_ioctl,
1187         .read           = uvc_v4l2_read,
1188         .mmap           = uvc_v4l2_mmap,
1189         .poll           = uvc_v4l2_poll,
1190 };
1191