drivers/media/video/uvc/uvc_v4l2.c

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   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_video_chain *chain,
  35         struct uvc_xu_control_mapping *xmap, int old)
  36 {
  37         struct uvc_control_mapping *map;
  38         unsigned int size;
  39         int ret;
  40
  41         map = kzalloc(sizeof *map, GFP_KERNEL);
  42         if (map == NULL)
  43                 return -ENOMEM;
  44
  45         map->id = xmap->id;
  46         memcpy(map->name, xmap->name, sizeof map->name);
  47         memcpy(map->entity, xmap->entity, sizeof map->entity);
  48         map->selector = xmap->selector;
  49         map->size = xmap->size;
  50         map->offset = xmap->offset;
  51         map->v4l2_type = xmap->v4l2_type;
  52         map->data_type = xmap->data_type;
  53
  54         switch (xmap->v4l2_type) {
  55         case V4L2_CTRL_TYPE_INTEGER:
  56         case V4L2_CTRL_TYPE_BOOLEAN:
  57         case V4L2_CTRL_TYPE_BUTTON:
  58                 break;
  59
  60         case V4L2_CTRL_TYPE_MENU:
  61                 if (old) {
  62                         uvc_trace(UVC_TRACE_CONTROL, "V4L2_CTRL_TYPE_MENU not "
  63                                   "supported for UVCIOC_CTRL_MAP_OLD.\n");
  64                         ret = -EINVAL;
  65                         goto done;
  66                 }
  67
  68                 size = xmap->menu_count * sizeof(*map->menu_info);
  69                 map->menu_info = kmalloc(size, GFP_KERNEL);
  70                 if (map->menu_info == NULL) {
  71                         ret = -ENOMEM;
  72                         goto done;
  73                 }
  74
  75                 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
  76                         ret = -EFAULT;
  77                         goto done;
  78                 }
  79
  80                 map->menu_count = xmap->menu_count;
  81                 break;
  82
  83         default:
  84                 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
  85                           "%u.\n", xmap->v4l2_type);
  86                 ret = -EINVAL;
  87                 goto done;
  88         }
  89
  90         ret = uvc_ctrl_add_mapping(chain, map);
  91
  92 done:
  93         kfree(map->menu_info);
  94         kfree(map);
  95
  96         return ret;
  97 }
  98
  99 /* ------------------------------------------------------------------------
 100  * V4L2 interface
 101  */
 102
 103 /*
 104  * Find the frame interval closest to the requested frame interval for the
 105  * given frame format and size. This should be done by the device as part of
 106  * the Video Probe and Commit negotiation, but some hardware don't implement
 107  * that feature.
 108  */
 109 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
 110 {
 111         unsigned int i;
 112
 113         if (frame->bFrameIntervalType) {
 114                 __u32 best = -1, dist;
 115
 116                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
 117                         dist = interval > frame->dwFrameInterval[i]
 118                              ? interval - frame->dwFrameInterval[i]
 119                              : frame->dwFrameInterval[i] - interval;
 120
 121                         if (dist > best)
 122                                 break;
 123
 124                         best = dist;
 125                 }
 126
 127                 interval = frame->dwFrameInterval[i-1];
 128         } else {
 129                 const __u32 min = frame->dwFrameInterval[0];
 130                 const __u32 max = frame->dwFrameInterval[1];
 131                 const __u32 step = frame->dwFrameInterval[2];
 132
 133                 interval = min + (interval - min + step/2) / step * step;
 134                 if (interval > max)
 135                         interval = max;
 136         }
 137
 138         return interval;
 139 }
 140
 141 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 142         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 143         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 144 {
 145         struct uvc_format *format = NULL;
 146         struct uvc_frame *frame = NULL;
 147         __u16 rw, rh;
 148         unsigned int d, maxd;
 149         unsigned int i;
 150         __u32 interval;
 151         int ret = 0;
 152         __u8 *fcc;
 153
 154         if (fmt->type != stream->type)
 155                 return -EINVAL;
 156
 157         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 158         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 159                         fmt->fmt.pix.pixelformat,
 160                         fcc[0], fcc[1], fcc[2], fcc[3],
 161                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 162
 163         /* Check if the hardware supports the requested format. */
 164         for (i = 0; i < stream->nformats; ++i) {
 165                 format = &stream->format[i];
 166                 if (format->fcc == fmt->fmt.pix.pixelformat)
 167                         break;
 168         }
 169
 170         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
 171                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
 172                                 fmt->fmt.pix.pixelformat);
 173                 return -EINVAL;
 174         }
 175
 176         /* Find the closest image size. The distance between image sizes is
 177          * the size in pixels of the non-overlapping regions between the
 178          * requested size and the frame-specified size.
 179          */
 180         rw = fmt->fmt.pix.width;
 181         rh = fmt->fmt.pix.height;
 182         maxd = (unsigned int)-1;
 183
 184         for (i = 0; i < format->nframes; ++i) {
 185                 __u16 w = format->frame[i].wWidth;
 186                 __u16 h = format->frame[i].wHeight;
 187
 188                 d = min(w, rw) * min(h, rh);
 189                 d = w*h + rw*rh - 2*d;
 190                 if (d < maxd) {
 191                         maxd = d;
 192                         frame = &format->frame[i];
 193                 }
 194
 195                 if (maxd == 0)
 196                         break;
 197         }
 198
 199         if (frame == NULL) {
 200                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 201                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 202                 return -EINVAL;
 203         }
 204
 205         /* Use the default frame interval. */
 206         interval = frame->dwDefaultFrameInterval;
 207         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 208                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 209                 (100000000/interval)%10);
 210
 211         /* Set the format index, frame index and frame interval. */
 212         memset(probe, 0, sizeof *probe);
 213         probe->bmHint = 1;      /* dwFrameInterval */
 214         probe->bFormatIndex = format->index;
 215         probe->bFrameIndex = frame->bFrameIndex;
 216         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 217         /* Some webcams stall the probe control set request when the
 218          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 219          * clearly states that the field is read-only from the host, so this
 220          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 221          * the webcam to work around the problem.
 222          *
 223          * The workaround could probably be enabled for all webcams, so the
 224          * quirk can be removed if needed. It's currently useful to detect
 225          * webcam bugs and fix them before they hit the market (providing
 226          * developers test their webcams with the Linux driver as well as with
 227          * the Windows driver).
 228          */
 229         mutex_lock(&stream->mutex);
 230         if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 231                 probe->dwMaxVideoFrameSize =
 232                         stream->ctrl.dwMaxVideoFrameSize;
 233
 234         /* Probe the device. */
 235         ret = uvc_probe_video(stream, probe);
 236         mutex_unlock(&stream->mutex);
 237         if (ret < 0)
 238                 goto done;
 239
 240         fmt->fmt.pix.width = frame->wWidth;
 241         fmt->fmt.pix.height = frame->wHeight;
 242         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 243         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 244         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 245         fmt->fmt.pix.colorspace = format->colorspace;
 246         fmt->fmt.pix.priv = 0;
 247
 248         if (uvc_format != NULL)
 249                 *uvc_format = format;
 250         if (uvc_frame != NULL)
 251                 *uvc_frame = frame;
 252
 253 done:
 254         return ret;
 255 }
 256
 257 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
 258         struct v4l2_format *fmt)
 259 {
 260         struct uvc_format *format;
 261         struct uvc_frame *frame;
 262         int ret = 0;
 263
 264         if (fmt->type != stream->type)
 265                 return -EINVAL;
 266
 267         mutex_lock(&stream->mutex);
 268         format = stream->cur_format;
 269         frame = stream->cur_frame;
 270
 271         if (format == NULL || frame == NULL) {
 272                 ret = -EINVAL;
 273                 goto done;
 274         }
 275
 276         fmt->fmt.pix.pixelformat = format->fcc;
 277         fmt->fmt.pix.width = frame->wWidth;
 278         fmt->fmt.pix.height = frame->wHeight;
 279         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 280         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 281         fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
 282         fmt->fmt.pix.colorspace = format->colorspace;
 283         fmt->fmt.pix.priv = 0;
 284
 285 done:
 286         mutex_unlock(&stream->mutex);
 287         return ret;
 288 }
 289
 290 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 291         struct v4l2_format *fmt)
 292 {
 293         struct uvc_streaming_control probe;
 294         struct uvc_format *format;
 295         struct uvc_frame *frame;
 296         int ret;
 297
 298         if (fmt->type != stream->type) {
 299         printk("uvc_v4l2_set_format, fmt->type(%d) != stream->type(%d)\n",fmt->type,stream->type);
 300                 return -EINVAL;
 301         }
 302
 303         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
 304         if (ret < 0)
 305                 return ret;
 306
 307         mutex_lock(&stream->mutex);
 308
 309         if (uvc_queue_allocated(&stream->queue)) {
 310         printk("uvc_queue_allocated failed\n");
 311                 ret = -EBUSY;
 312                 goto done;
 313         }
 314
 315         memcpy(&stream->ctrl, &probe, sizeof probe);
 316         stream->cur_format = format;
 317         stream->cur_frame = frame;
 318
 319 done:
 320         mutex_unlock(&stream->mutex);
 321         return ret;
 322 }
 323
 324 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
 325                 struct v4l2_streamparm *parm)
 326 {
 327         uint32_t numerator, denominator;
 328
 329         if (parm->type != stream->type)
 330                 return -EINVAL;
 331
 332         mutex_lock(&stream->mutex);
 333         numerator = stream->ctrl.dwFrameInterval;
 334         mutex_unlock(&stream->mutex);
 335
 336         denominator = 10000000;
 337         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 338
 339         memset(parm, 0, sizeof *parm);
 340         parm->type = stream->type;
 341
 342         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 343                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 344                 parm->parm.capture.capturemode = 0;
 345                 parm->parm.capture.timeperframe.numerator = numerator;
 346                 parm->parm.capture.timeperframe.denominator = denominator;
 347                 parm->parm.capture.extendedmode = 0;
 348                 parm->parm.capture.readbuffers = 0;
 349         } else {
 350                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 351                 parm->parm.output.outputmode = 0;
 352                 parm->parm.output.timeperframe.numerator = numerator;
 353                 parm->parm.output.timeperframe.denominator = denominator;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 360                 struct v4l2_streamparm *parm)
 361 {
 362         struct uvc_streaming_control probe;
 363         struct v4l2_fract timeperframe;
 364         uint32_t interval;
 365         int ret;
 366
 367         if (parm->type != stream->type)
 368                 return -EINVAL;
 369
 370         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 371                 timeperframe = parm->parm.capture.timeperframe;
 372         else
 373                 timeperframe = parm->parm.output.timeperframe;
 374
 375         interval = uvc_fraction_to_interval(timeperframe.numerator,
 376                 timeperframe.denominator);
 377         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 378                 timeperframe.numerator, timeperframe.denominator, interval);
 379
 380         mutex_lock(&stream->mutex);
 381
 382         if (uvc_queue_streaming(&stream->queue)) {
 383                 mutex_unlock(&stream->mutex);
 384                 return -EBUSY;
 385         }
 386
 387         memcpy(&probe, &stream->ctrl, sizeof probe);
 388         probe.dwFrameInterval =
 389                 uvc_try_frame_interval(stream->cur_frame, interval);
 390
 391         /* Probe the device with the new settings. */
 392         ret = uvc_probe_video(stream, &probe);
 393         if (ret < 0) {
 394                 mutex_unlock(&stream->mutex);
 395                 return ret;
 396         }
 397
 398         memcpy(&stream->ctrl, &probe, sizeof probe);
 399         mutex_unlock(&stream->mutex);
 400
 401         /* Return the actual frame period. */
 402         timeperframe.numerator = probe.dwFrameInterval;
 403         timeperframe.denominator = 10000000;
 404         uvc_simplify_fraction(&timeperframe.numerator,
 405                 &timeperframe.denominator, 8, 333);
 406
 407         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 408                 parm->parm.capture.timeperframe = timeperframe;
 409         else
 410                 parm->parm.output.timeperframe = timeperframe;
 411
 412         return 0;
 413 }
 414
 415 /* ------------------------------------------------------------------------
 416  * Privilege management
 417  */
 418
 419 /*
 420  * Privilege management is the multiple-open implementation basis. The current
 421  * implementation is completely transparent for the end-user and doesn't
 422  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 423  * Those ioctls enable finer control on the device (by making possible for a
 424  * user to request exclusive access to a device), but are not mature yet.
 425  * Switching to the V4L2 priority mechanism might be considered in the future
 426  * if this situation changes.
 427  *
 428  * Each open instance of a UVC device can either be in a privileged or
 429  * unprivileged state. Only a single instance can be in a privileged state at
 430  * a given time. Trying to perform an operation that requires privileges will
 431  * automatically acquire the required privileges if possible, or return -EBUSY
 432  * otherwise. Privileges are dismissed when closing the instance or when
 433  * freeing the video buffers using VIDIOC_REQBUFS.
 434  *
 435  * Operations that require privileges are:
 436  *
 437  * - VIDIOC_S_INPUT
 438  * - VIDIOC_S_PARM
 439  * - VIDIOC_S_FMT
 440  * - VIDIOC_REQBUFS
 441  */
 442 static int uvc_acquire_privileges(struct uvc_fh *handle)
 443 {
 444         /* Always succeed if the handle is already privileged. */
 445         if (handle->state == UVC_HANDLE_ACTIVE)
 446                 return 0;
 447
 448         /* Check if the device already has a privileged handle. */
 449         if (atomic_inc_return(&handle->stream->active) != 1) {
 450                 atomic_dec(&handle->stream->active);
 451                 return -EBUSY;
 452         }
 453
 454         handle->state = UVC_HANDLE_ACTIVE;
 455         return 0;
 456 }
 457
 458 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 459 {
 460         if (handle->state == UVC_HANDLE_ACTIVE)
 461                 atomic_dec(&handle->stream->active);
 462
 463         handle->state = UVC_HANDLE_PASSIVE;
 464 }
 465
 466 static int uvc_has_privileges(struct uvc_fh *handle)
 467 {
 468         return handle->state == UVC_HANDLE_ACTIVE;
 469 }
 470
 471 /* ------------------------------------------------------------------------
 472  * V4L2 file operations
 473  */
 474
 475 static int uvc_v4l2_open(struct file *file)
 476 {
 477         struct uvc_streaming *stream;
 478         struct uvc_fh *handle;
 479         int ret = 0;
 480
 481         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 482         stream = video_drvdata(file);
 483
 484         if (stream->dev->state & UVC_DEV_DISCONNECTED)
 485                 return -ENODEV;
 486
 487         ret = usb_autopm_get_interface(stream->dev->intf);
 488         if (ret < 0)
 489                 return ret;
 490
 491         /* Create the device handle. */
 492         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 493         if (handle == NULL) {
 494                 usb_autopm_put_interface(stream->dev->intf);
 495                 return -ENOMEM;
 496         }
 497
 498         if (atomic_inc_return(&stream->dev->users) == 1) {
 499                 ret = uvc_status_start(stream->dev);
 500                 if (ret < 0) {
 501                         usb_autopm_put_interface(stream->dev->intf);
 502                         atomic_dec(&stream->dev->users);
 503                         kfree(handle);
 504                         return ret;
 505                 }
 506         }
 507
 508         handle->chain = stream->chain;
 509         handle->stream = stream;
 510         handle->state = UVC_HANDLE_PASSIVE;
 511         file->private_data = handle;
 512
 513         return 0;
 514 }
 515
 516 static int uvc_v4l2_release(struct file *file)
 517 {
 518         struct uvc_fh *handle = file->private_data;
 519         struct uvc_streaming *stream = handle->stream;
 520
 521         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 522
 523         /* Only free resources if this is a privileged handle. */
 524         if (uvc_has_privileges(handle)) {
 525                 uvc_video_enable(stream, 0);
 526
 527                 if (uvc_free_buffers(&stream->queue) < 0)
 528                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 529                                         "free buffers.\n");
 530         }
 531
 532         /* Release the file handle. */
 533         uvc_dismiss_privileges(handle);
 534         kfree(handle);
 535         file->private_data = NULL;
 536
 537         if (atomic_dec_return(&stream->dev->users) == 0)
 538                 uvc_status_stop(stream->dev);
 539
 540         usb_autopm_put_interface(stream->dev->intf);
 541         return 0;
 542 }
 543
 544 static void uvc_v4l2_ioctl_warn(void)
 545 {
 546         static int warned;
 547
 548         if (warned)
 549                 return;
 550
 551         uvc_printk(KERN_INFO, "Deprecated UVCIOC_CTRL_{ADD,MAP_OLD,GET,SET} "
 552                    "ioctls will be removed in 2.6.42.\n");
 553         uvc_printk(KERN_INFO, "See http://www.ideasonboard.org/uvc/upgrade/ "
 554                    "for upgrade instructions.\n");
 555         warned = 1;
 556 }
 557
 558 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 559 {
 560         struct video_device *vdev = video_devdata(file);
 561         struct uvc_fh *handle = file->private_data;
 562         struct uvc_video_chain *chain = handle->chain;
 563         struct uvc_streaming *stream = handle->stream;
 564         long ret = 0;
 565
 566         switch (cmd) {
 567         /* Query capabilities */
 568         case VIDIOC_QUERYCAP:
 569         {
 570                 struct v4l2_capability *cap = arg;
 571
 572                 memset(cap, 0, sizeof *cap);
 573                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
 574                 strlcpy(cap->card, vdev->name, sizeof cap->card);
 575                 usb_make_path(stream->dev->udev,
 576                               cap->bus_info, sizeof(cap->bus_info));
 577                 cap->version = DRIVER_VERSION_NUMBER;
 578                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 579                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 580                                           | V4L2_CAP_STREAMING;
 581                 else
 582                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
 583                                           | V4L2_CAP_STREAMING;
 584                 break;
 585         }
 586
 587         /* Get, Set & Query control */
 588         case VIDIOC_QUERYCTRL:
 589                 return uvc_query_v4l2_ctrl(chain, arg);
 590
 591         case VIDIOC_G_CTRL:
 592         {
 593                 struct v4l2_control *ctrl = arg;
 594                 struct v4l2_ext_control xctrl;
 595
 596                 memset(&xctrl, 0, sizeof xctrl);
 597                 xctrl.id = ctrl->id;
 598
 599                 ret = uvc_ctrl_begin(chain);
 600                 if (ret < 0)
 601                         return ret;
 602
 603                 ret = uvc_ctrl_get(chain, &xctrl);
 604                 uvc_ctrl_rollback(chain);
 605                 if (ret >= 0)
 606                         ctrl->value = xctrl.value;
 607                 break;
 608         }
 609
 610         case VIDIOC_S_CTRL:
 611         {
 612                 struct v4l2_control *ctrl = arg;
 613                 struct v4l2_ext_control xctrl;
 614
 615                 memset(&xctrl, 0, sizeof xctrl);
 616                 xctrl.id = ctrl->id;
 617                 xctrl.value = ctrl->value;
 618
 619                 ret = uvc_ctrl_begin(chain);
 620                 if (ret < 0)
 621                         return ret;
 622
 623                 ret = uvc_ctrl_set(chain, &xctrl);
 624                 if (ret < 0) {
 625                         uvc_ctrl_rollback(chain);
 626                         return ret;
 627                 }
 628                 ret = uvc_ctrl_commit(chain);
 629                 if (ret == 0)
 630                         ctrl->value = xctrl.value;
 631                 break;
 632         }
 633
 634         case VIDIOC_QUERYMENU:
 635                 return uvc_query_v4l2_menu(chain, arg);
 636
 637         case VIDIOC_G_EXT_CTRLS:
 638         {
 639                 struct v4l2_ext_controls *ctrls = arg;
 640                 struct v4l2_ext_control *ctrl = ctrls->controls;
 641                 unsigned int i;
 642
 643                 ret = uvc_ctrl_begin(chain);
 644                 if (ret < 0)
 645                         return ret;
 646
 647                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 648                         ret = uvc_ctrl_get(chain, ctrl);
 649                         if (ret < 0) {
 650                                 uvc_ctrl_rollback(chain);
 651                                 ctrls->error_idx = i;
 652                                 return ret;
 653                         }
 654                 }
 655                 ctrls->error_idx = 0;
 656                 ret = uvc_ctrl_rollback(chain);
 657                 break;
 658         }
 659
 660         case VIDIOC_S_EXT_CTRLS:
 661         case VIDIOC_TRY_EXT_CTRLS:
 662         {
 663                 struct v4l2_ext_controls *ctrls = arg;
 664                 struct v4l2_ext_control *ctrl = ctrls->controls;
 665                 unsigned int i;
 666
 667                 ret = uvc_ctrl_begin(chain);
 668                 if (ret < 0)
 669                         return ret;
 670
 671                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 672                         ret = uvc_ctrl_set(chain, ctrl);
 673                         if (ret < 0) {
 674                                 uvc_ctrl_rollback(chain);
 675                                 ctrls->error_idx = i;
 676                                 return ret;
 677                         }
 678                 }
 679
 680                 ctrls->error_idx = 0;
 681
 682                 if (cmd == VIDIOC_S_EXT_CTRLS)
 683                         ret = uvc_ctrl_commit(chain);
 684                 else
 685                         ret = uvc_ctrl_rollback(chain);
 686                 break;
 687         }
 688
 689         /* Get, Set & Enum input */
 690         case VIDIOC_ENUMINPUT:
 691         {
 692                 const struct uvc_entity *selector = chain->selector;
 693                 struct v4l2_input *input = arg;
 694                 struct uvc_entity *iterm = NULL;
 695                 u32 index = input->index;
 696                 int pin = 0;
 697
 698                 if (selector == NULL ||
 699                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 700                         if (index != 0)
 701                                 return -EINVAL;
 702                         list_for_each_entry(iterm, &chain->entities, chain) {
 703                                 if (UVC_ENTITY_IS_ITERM(iterm))
 704                                         break;
 705                         }
 706                         pin = iterm->id;
 707                 } else if (pin < selector->bNrInPins) {
 708                         pin = selector->baSourceID[index];
 709                         list_for_each_entry(iterm, &chain->entities, chain) {
 710                                 if (!UVC_ENTITY_IS_ITERM(iterm))
 711                                         continue;
 712                                 if (iterm->id == pin)
 713                                         break;
 714                         }
 715                 }
 716
 717                 if (iterm == NULL || iterm->id != pin)
 718                         return -EINVAL;
 719
 720                 memset(input, 0, sizeof *input);
 721                 input->index = index;
 722                 strlcpy(input->name, iterm->name, sizeof input->name);
 723                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
 724                         input->type = V4L2_INPUT_TYPE_CAMERA;
 725                 break;
 726         }
 727
 728         case VIDIOC_G_INPUT:
 729         {
 730                 u8 input;
 731
 732                 if (chain->selector == NULL ||
 733                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 734                         *(int *)arg = 0;
 735                         break;
 736                 }
 737
 738                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
 739                         chain->selector->id, chain->dev->intfnum,
 740                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 741                 if (ret < 0)
 742                         return ret;
 743
 744                 *(int *)arg = input - 1;
 745                 break;
 746         }
 747
 748         case VIDIOC_S_INPUT:
 749         {
 750                 u32 input = *(u32 *)arg + 1;
 751
 752                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 753                         return ret;
 754
 755                 if (chain->selector == NULL ||
 756                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 757                         if (input != 1)
 758                                 return -EINVAL;
 759                         break;
 760                 }
 761
 762                 if (input == 0 || input > chain->selector->bNrInPins)
 763                         return -EINVAL;
 764
 765                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
 766                         chain->selector->id, chain->dev->intfnum,
 767                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 768         }
 769
 770         /* Try, Get, Set & Enum format */
 771         case VIDIOC_ENUM_FMT:
 772         {
 773                 struct v4l2_fmtdesc *fmt = arg;
 774                 struct uvc_format *format;
 775                 enum v4l2_buf_type type = fmt->type;
 776                 __u32 index = fmt->index;
 777
 778                 if (fmt->type != stream->type ||
 779                     fmt->index >= stream->nformats)
 780                         return -EINVAL;
 781
 782                 memset(fmt, 0, sizeof(*fmt));
 783                 fmt->index = index;
 784                 fmt->type = type;
 785
 786                 format = &stream->format[fmt->index];
 787                 fmt->flags = 0;
 788                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 789                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 790                 strlcpy(fmt->description, format->name,
 791                         sizeof fmt->description);
 792                 fmt->description[sizeof fmt->description - 1] = 0;
 793                 fmt->pixelformat = format->fcc;
 794                 break;
 795         }
 796
 797         case VIDIOC_TRY_FMT:
 798         {
 799                 struct uvc_streaming_control probe;
 800
 801                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
 802         }
 803
 804         case VIDIOC_S_FMT:
 805                 if ((ret = uvc_acquire_privileges(handle)) < 0) {
 806             printk("uvc_acquire_privileges error.");
 807                         return ret;
 808                 }
 809
 810                 return uvc_v4l2_set_format(stream, arg);
 811
 812         case VIDIOC_G_FMT:
 813                 return uvc_v4l2_get_format(stream, arg);
 814
 815         /* Frame size enumeration */
 816         case VIDIOC_ENUM_FRAMESIZES:
 817         {
 818                 struct v4l2_frmsizeenum *fsize = arg;
 819                 struct uvc_format *format = NULL;
 820                 struct uvc_frame *frame;
 821                 int i;
 822
 823                 /* Look for the given pixel format */
 824                 for (i = 0; i < stream->nformats; i++) {
 825                         if (stream->format[i].fcc ==
 826                                         fsize->pixel_format) {
 827                                 format = &stream->format[i];
 828                                 break;
 829                         }
 830                 }
 831                 if (format == NULL)
 832                         return -EINVAL;
 833
 834                 if (fsize->index >= format->nframes)
 835                         return -EINVAL;
 836
 837                 frame = &format->frame[fsize->index];
 838                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 839                 fsize->discrete.width = frame->wWidth;
 840                 fsize->discrete.height = frame->wHeight;
 841                 break;
 842         }
 843
 844         /* Frame interval enumeration */
 845         case VIDIOC_ENUM_FRAMEINTERVALS:
 846         {
 847                 struct v4l2_frmivalenum *fival = arg;
 848                 struct uvc_format *format = NULL;
 849                 struct uvc_frame *frame = NULL;
 850                 int i;
 851
 852                 /* Look for the given pixel format and frame size */
 853                 for (i = 0; i < stream->nformats; i++) {
 854                         if (stream->format[i].fcc ==
 855                                         fival->pixel_format) {
 856                                 format = &stream->format[i];
 857                                 break;
 858                         }
 859                 }
 860                 if (format == NULL)
 861                         return -EINVAL;
 862
 863                 for (i = 0; i < format->nframes; i++) {
 864                         if (format->frame[i].wWidth == fival->width &&
 865                             format->frame[i].wHeight == fival->height) {
 866                                 frame = &format->frame[i];
 867                                 break;
 868                         }
 869                 }
 870                 if (frame == NULL)
 871                         return -EINVAL;
 872
 873                 if (frame->bFrameIntervalType) {
 874                         if (fival->index >= frame->bFrameIntervalType)
 875                                 return -EINVAL;
 876
 877                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 878                         fival->discrete.numerator =
 879                                 frame->dwFrameInterval[fival->index];
 880                         fival->discrete.denominator = 10000000;
 881                         uvc_simplify_fraction(&fival->discrete.numerator,
 882                                 &fival->discrete.denominator, 8, 333);
 883                 } else {
 884                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 885                         fival->stepwise.min.numerator =
 886                                 frame->dwFrameInterval[0];
 887                         fival->stepwise.min.denominator = 10000000;
 888                         fival->stepwise.max.numerator =
 889                                 frame->dwFrameInterval[1];
 890                         fival->stepwise.max.denominator = 10000000;
 891                         fival->stepwise.step.numerator =
 892                                 frame->dwFrameInterval[2];
 893                         fival->stepwise.step.denominator = 10000000;
 894                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 895                                 &fival->stepwise.min.denominator, 8, 333);
 896                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 897                                 &fival->stepwise.max.denominator, 8, 333);
 898                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 899                                 &fival->stepwise.step.denominator, 8, 333);
 900                 }
 901                 break;
 902         }
 903
 904         /* Get & Set streaming parameters */
 905         case VIDIOC_G_PARM:
 906                 return uvc_v4l2_get_streamparm(stream, arg);
 907
 908         case VIDIOC_S_PARM:
 909                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 910                         return ret;
 911
 912                 return uvc_v4l2_set_streamparm(stream, arg);
 913
 914         /* Cropping and scaling */
 915         case VIDIOC_CROPCAP:
 916         {
 917                 struct v4l2_cropcap *ccap = arg;
 918
 919                 if (ccap->type != stream->type)
 920                         return -EINVAL;
 921
 922                 ccap->bounds.left = 0;
 923                 ccap->bounds.top = 0;
 924
 925                 mutex_lock(&stream->mutex);
 926                 ccap->bounds.width = stream->cur_frame->wWidth;
 927                 ccap->bounds.height = stream->cur_frame->wHeight;
 928                 mutex_unlock(&stream->mutex);
 929
 930                 ccap->defrect = ccap->bounds;
 931
 932                 ccap->pixelaspect.numerator = 1;
 933                 ccap->pixelaspect.denominator = 1;
 934                 break;
 935         }
 936
 937         case VIDIOC_G_CROP:
 938         case VIDIOC_S_CROP:
 939                 return -EINVAL;
 940
 941         /* Buffers & streaming */
 942         case VIDIOC_REQBUFS:
 943         {
 944                 struct v4l2_requestbuffers *rb = arg;
 945
 946                 if (rb->type != stream->type ||
 947                     rb->memory != V4L2_MEMORY_MMAP)
 948                         return -EINVAL;
 949
 950                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 951                         return ret;
 952
 953                 mutex_lock(&stream->mutex);
 954                 ret = uvc_alloc_buffers(&stream->queue, rb->count,
 955                                         stream->ctrl.dwMaxVideoFrameSize);
 956                 mutex_unlock(&stream->mutex);
 957                 if (ret < 0)
 958                         return ret;
 959
 960                 if (ret == 0)
 961                         uvc_dismiss_privileges(handle);
 962
 963                 rb->count = ret;
 964                 ret = 0;
 965                 break;
 966         }
 967
 968         case VIDIOC_QUERYBUF:
 969         {
 970                 struct v4l2_buffer *buf = arg;
 971
 972                 if (buf->type != stream->type)
 973                         return -EINVAL;
 974
 975                 if (!uvc_has_privileges(handle))
 976                         return -EBUSY;
 977
 978                 return uvc_query_buffer(&stream->queue, buf);
 979         }
 980
 981         case VIDIOC_QBUF:
 982                 if (!uvc_has_privileges(handle)) {
 983             printk("uvcvideo: VIDIOC_QBUF uvc_has_privileges failed\n");
 984                         return -EBUSY;
 985                 }
 986
 987                 return uvc_queue_buffer(&stream->queue, arg);
 988
 989         case VIDIOC_DQBUF:
 990                 if (!uvc_has_privileges(handle)) {
 991             printk("uvcvideo: VIDIOC_DQBUF uvc_has_privileges failed\n");
 992                         return -EBUSY;
 993                 }
 994
 995                 return uvc_dequeue_buffer(&stream->queue, arg,
 996                         file->f_flags & O_NONBLOCK);
 997
 998         case VIDIOC_STREAMON:
 999         {
1000                 int *type = arg;
1001
1002                 if (*type != stream->type)
1003                         return -EINVAL;
1004
1005                 if (!uvc_has_privileges(handle))
1006                         return -EBUSY;
1007
1008                 mutex_lock(&stream->mutex);
1009                 ret = uvc_video_enable(stream, 1);
1010                 mutex_unlock(&stream->mutex);
1011                 if (ret < 0)
1012                         return ret;
1013                 break;
1014         }
1015
1016         case VIDIOC_STREAMOFF:
1017         {
1018                 int *type = arg;
1019
1020                 if (*type != stream->type)
1021                         return -EINVAL;
1022
1023                 if (!uvc_has_privileges(handle))
1024                         return -EBUSY;
1025
1026                 return uvc_video_enable(stream, 0);
1027         }
1028
1029         /* Analog video standards make no sense for digital cameras. */
1030         case VIDIOC_ENUMSTD:
1031         case VIDIOC_QUERYSTD:
1032         case VIDIOC_G_STD:
1033         case VIDIOC_S_STD:
1034
1035         case VIDIOC_OVERLAY:
1036
1037         case VIDIOC_ENUMAUDIO:
1038         case VIDIOC_ENUMAUDOUT:
1039
1040         case VIDIOC_ENUMOUTPUT:
1041                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1042                 return -EINVAL;
1043
1044         /* Dynamic controls. UVCIOC_CTRL_ADD, UVCIOC_CTRL_MAP_OLD,
1045          * UVCIOC_CTRL_GET and UVCIOC_CTRL_SET are deprecated and scheduled for
1046          * removal in 2.6.42.
1047          */
1048         case __UVCIOC_CTRL_ADD:
1049                 uvc_v4l2_ioctl_warn();
1050                 return -EEXIST;
1051
1052         case __UVCIOC_CTRL_MAP_OLD:
1053                 uvc_v4l2_ioctl_warn();
1054         case __UVCIOC_CTRL_MAP:
1055         case UVCIOC_CTRL_MAP:
1056                 return uvc_ioctl_ctrl_map(chain, arg,
1057                                           cmd == __UVCIOC_CTRL_MAP_OLD);
1058
1059         case __UVCIOC_CTRL_GET:
1060         case __UVCIOC_CTRL_SET:
1061         {
1062                 struct uvc_xu_control *xctrl = arg;
1063                 struct uvc_xu_control_query xqry = {
1064                         .unit           = xctrl->unit,
1065                         .selector       = xctrl->selector,
1066                         .query          = cmd == __UVCIOC_CTRL_GET
1067                                         ? UVC_GET_CUR : UVC_SET_CUR,
1068                         .size           = xctrl->size,
1069                         .data           = xctrl->data,
1070                 };
1071
1072                 uvc_v4l2_ioctl_warn();
1073                 return uvc_xu_ctrl_query(chain, &xqry);
1074         }
1075
1076         case UVCIOC_CTRL_QUERY:
1077                 return uvc_xu_ctrl_query(chain, arg);
1078
1079         default:
1080                 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1081                 return -EINVAL;
1082         }
1083
1084         return ret;
1085 }
1086
1087 static long uvc_v4l2_ioctl(struct file *file,
1088                      unsigned int cmd, unsigned long arg)
1089 {
1090         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1091                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1092                 v4l_printk_ioctl(cmd);
1093                 printk(")\n");
1094         }
1095
1096         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1097 }
1098
1099 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1100                     size_t count, loff_t *ppos)
1101 {
1102         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1103         return -EINVAL;
1104 }
1105
1106 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1107 {
1108         struct uvc_fh *handle = file->private_data;
1109         struct uvc_streaming *stream = handle->stream;
1110
1111         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1112
1113         return uvc_queue_mmap(&stream->queue, vma);
1114 }
1115
1116 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1117 {
1118         struct uvc_fh *handle = file->private_data;
1119         struct uvc_streaming *stream = handle->stream;
1120
1121         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1122
1123         return uvc_queue_poll(&stream->queue, file, wait);
1124 }
1125
1126 #ifndef CONFIG_MMU
1127 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1128                 unsigned long addr, unsigned long len, unsigned long pgoff,
1129                 unsigned long flags)
1130 {
1131         struct uvc_fh *handle = file->private_data;
1132         struct uvc_streaming *stream = handle->stream;
1133
1134         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1135
1136         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1137 }
1138 #endif
1139
1140 const struct v4l2_file_operations uvc_fops = {
1141         .owner          = THIS_MODULE,
1142         .open           = uvc_v4l2_open,
1143         .release        = uvc_v4l2_release,
1144         .unlocked_ioctl = uvc_v4l2_ioctl,
1145         .read           = uvc_v4l2_read,
1146         .mmap           = uvc_v4l2_mmap,
1147         .poll           = uvc_v4l2_poll,
1148 #ifndef CONFIG_MMU
1149         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1150 #endif
1151 };
1152