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

   1 /*
   2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
   3  *
   4  *      Copyright (C) 2005-2008
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/version.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/usb.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/mm.h>
  22 #include <linux/wait.h>
  23 #include <asm/atomic.h>
  24
  25 #include <media/v4l2-common.h>
  26 #include <media/v4l2-ioctl.h>
  27
  28 #include "uvcvideo.h"
  29
  30 /* ------------------------------------------------------------------------
  31  * V4L2 interface
  32  */
  33
  34 /*
  35  * Mapping V4L2 controls to UVC controls can be straighforward if done well.
  36  * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
  37  * must be grouped (for instance the Red Balance, Blue Balance and Do White
  38  * Balance V4L2 controls use the White Balance Component UVC control) or
  39  * otherwise translated. The approach we take here is to use a translation
  40  * table for the controls which can be mapped directly, and handle the others
  41  * manually.
  42  */
  43 static int uvc_v4l2_query_menu(struct uvc_video_device *video,
  44         struct v4l2_querymenu *query_menu)
  45 {
  46         struct uvc_menu_info *menu_info;
  47         struct uvc_control_mapping *mapping;
  48         struct uvc_control *ctrl;
  49
  50         ctrl = uvc_find_control(video, query_menu->id, &mapping);
  51         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
  52                 return -EINVAL;
  53
  54         if (query_menu->index >= mapping->menu_count)
  55                 return -EINVAL;
  56
  57         menu_info = &mapping->menu_info[query_menu->index];
  58         strncpy(query_menu->name, menu_info->name, 32);
  59         return 0;
  60 }
  61
  62 /*
  63  * Find the frame interval closest to the requested frame interval for the
  64  * given frame format and size. This should be done by the device as part of
  65  * the Video Probe and Commit negotiation, but some hardware don't implement
  66  * that feature.
  67  */
  68 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
  69 {
  70         unsigned int i;
  71
  72         if (frame->bFrameIntervalType) {
  73                 __u32 best = -1, dist;
  74
  75                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
  76                         dist = interval > frame->dwFrameInterval[i]
  77                              ? interval - frame->dwFrameInterval[i]
  78                              : frame->dwFrameInterval[i] - interval;
  79
  80                         if (dist > best)
  81                                 break;
  82
  83                         best = dist;
  84                 }
  85
  86                 interval = frame->dwFrameInterval[i-1];
  87         } else {
  88                 const __u32 min = frame->dwFrameInterval[0];
  89                 const __u32 max = frame->dwFrameInterval[1];
  90                 const __u32 step = frame->dwFrameInterval[2];
  91
  92                 interval = min + (interval - min + step/2) / step * step;
  93                 if (interval > max)
  94                         interval = max;
  95         }
  96
  97         return interval;
  98 }
  99
 100 static int uvc_v4l2_try_format(struct uvc_video_device *video,
 101         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 102         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
 103 {
 104         struct uvc_format *format = NULL;
 105         struct uvc_frame *frame = NULL;
 106         __u16 rw, rh;
 107         unsigned int d, maxd;
 108         unsigned int i;
 109         __u32 interval;
 110         int ret = 0;
 111         __u8 *fcc;
 112
 113         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 114                 return -EINVAL;
 115
 116         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
 117         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
 118                         fmt->fmt.pix.pixelformat,
 119                         fcc[0], fcc[1], fcc[2], fcc[3],
 120                         fmt->fmt.pix.width, fmt->fmt.pix.height);
 121
 122         /* Check if the hardware supports the requested format. */
 123         for (i = 0; i < video->streaming->nformats; ++i) {
 124                 format = &video->streaming->format[i];
 125                 if (format->fcc == fmt->fmt.pix.pixelformat)
 126                         break;
 127         }
 128
 129         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
 130                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
 131                                 fmt->fmt.pix.pixelformat);
 132                 return -EINVAL;
 133         }
 134
 135         /* Find the closest image size. The distance between image sizes is
 136          * the size in pixels of the non-overlapping regions between the
 137          * requested size and the frame-specified size.
 138          */
 139         rw = fmt->fmt.pix.width;
 140         rh = fmt->fmt.pix.height;
 141         maxd = (unsigned int)-1;
 142
 143         for (i = 0; i < format->nframes; ++i) {
 144                 __u16 w = format->frame[i].wWidth;
 145                 __u16 h = format->frame[i].wHeight;
 146
 147                 d = min(w, rw) * min(h, rh);
 148                 d = w*h + rw*rh - 2*d;
 149                 if (d < maxd) {
 150                         maxd = d;
 151                         frame = &format->frame[i];
 152                 }
 153
 154                 if (maxd == 0)
 155                         break;
 156         }
 157
 158         if (frame == NULL) {
 159                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
 160                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
 161                 return -EINVAL;
 162         }
 163
 164         /* Use the default frame interval. */
 165         interval = frame->dwDefaultFrameInterval;
 166         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
 167                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
 168                 (100000000/interval)%10);
 169
 170         /* Set the format index, frame index and frame interval. */
 171         memset(probe, 0, sizeof *probe);
 172         probe->bmHint = 1;      /* dwFrameInterval */
 173         probe->bFormatIndex = format->index;
 174         probe->bFrameIndex = frame->bFrameIndex;
 175         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
 176         /* Some webcams stall the probe control set request when the
 177          * dwMaxVideoFrameSize field is set to zero. The UVC specification
 178          * clearly states that the field is read-only from the host, so this
 179          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
 180          * the webcam to work around the problem.
 181          *
 182          * The workaround could probably be enabled for all webcams, so the
 183          * quirk can be removed if needed. It's currently useful to detect
 184          * webcam bugs and fix them before they hit the market (providing
 185          * developers test their webcams with the Linux driver as well as with
 186          * the Windows driver).
 187          */
 188         if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
 189                 probe->dwMaxVideoFrameSize =
 190                         video->streaming->ctrl.dwMaxVideoFrameSize;
 191
 192         /* Probe the device */
 193         if ((ret = uvc_probe_video(video, probe)) < 0)
 194                 goto done;
 195
 196         fmt->fmt.pix.width = frame->wWidth;
 197         fmt->fmt.pix.height = frame->wHeight;
 198         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 199         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 200         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
 201         fmt->fmt.pix.colorspace = format->colorspace;
 202         fmt->fmt.pix.priv = 0;
 203
 204         if (uvc_format != NULL)
 205                 *uvc_format = format;
 206         if (uvc_frame != NULL)
 207                 *uvc_frame = frame;
 208
 209 done:
 210         return ret;
 211 }
 212
 213 static int uvc_v4l2_get_format(struct uvc_video_device *video,
 214         struct v4l2_format *fmt)
 215 {
 216         struct uvc_format *format = video->streaming->cur_format;
 217         struct uvc_frame *frame = video->streaming->cur_frame;
 218
 219         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 220                 return -EINVAL;
 221
 222         if (format == NULL || frame == NULL)
 223                 return -EINVAL;
 224
 225         fmt->fmt.pix.pixelformat = format->fcc;
 226         fmt->fmt.pix.width = frame->wWidth;
 227         fmt->fmt.pix.height = frame->wHeight;
 228         fmt->fmt.pix.field = V4L2_FIELD_NONE;
 229         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
 230         fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
 231         fmt->fmt.pix.colorspace = format->colorspace;
 232         fmt->fmt.pix.priv = 0;
 233
 234         return 0;
 235 }
 236
 237 static int uvc_v4l2_set_format(struct uvc_video_device *video,
 238         struct v4l2_format *fmt)
 239 {
 240         struct uvc_streaming_control probe;
 241         struct uvc_format *format;
 242         struct uvc_frame *frame;
 243         int ret;
 244
 245         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 246                 return -EINVAL;
 247
 248         if (uvc_queue_streaming(&video->queue))
 249                 return -EBUSY;
 250
 251         ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
 252         if (ret < 0)
 253                 return ret;
 254
 255         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 256         video->streaming->cur_format = format;
 257         video->streaming->cur_frame = frame;
 258
 259         return 0;
 260 }
 261
 262 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
 263                 struct v4l2_streamparm *parm)
 264 {
 265         uint32_t numerator, denominator;
 266
 267         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 268                 return -EINVAL;
 269
 270         numerator = video->streaming->ctrl.dwFrameInterval;
 271         denominator = 10000000;
 272         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
 273
 274         memset(parm, 0, sizeof *parm);
 275         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 276         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 277         parm->parm.capture.capturemode = 0;
 278         parm->parm.capture.timeperframe.numerator = numerator;
 279         parm->parm.capture.timeperframe.denominator = denominator;
 280         parm->parm.capture.extendedmode = 0;
 281         parm->parm.capture.readbuffers = 0;
 282
 283         return 0;
 284 }
 285
 286 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
 287                 struct v4l2_streamparm *parm)
 288 {
 289         struct uvc_frame *frame = video->streaming->cur_frame;
 290         struct uvc_streaming_control probe;
 291         uint32_t interval;
 292         int ret;
 293
 294         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 295                 return -EINVAL;
 296
 297         if (uvc_queue_streaming(&video->queue))
 298                 return -EBUSY;
 299
 300         memcpy(&probe, &video->streaming->ctrl, sizeof probe);
 301         interval = uvc_fraction_to_interval(
 302                         parm->parm.capture.timeperframe.numerator,
 303                         parm->parm.capture.timeperframe.denominator);
 304
 305         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
 306                         parm->parm.capture.timeperframe.numerator,
 307                         parm->parm.capture.timeperframe.denominator,
 308                         interval);
 309         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
 310
 311         /* Probe the device with the new settings. */
 312         if ((ret = uvc_probe_video(video, &probe)) < 0)
 313                 return ret;
 314
 315         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
 316
 317         /* Return the actual frame period. */
 318         parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
 319         parm->parm.capture.timeperframe.denominator = 10000000;
 320         uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
 321                                 &parm->parm.capture.timeperframe.denominator,
 322                                 8, 333);
 323
 324         return 0;
 325 }
 326
 327 /* ------------------------------------------------------------------------
 328  * Privilege management
 329  */
 330
 331 /*
 332  * Privilege management is the multiple-open implementation basis. The current
 333  * implementation is completely transparent for the end-user and doesn't
 334  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
 335  * Those ioctls enable finer control on the device (by making possible for a
 336  * user to request exclusive access to a device), but are not mature yet.
 337  * Switching to the V4L2 priority mechanism might be considered in the future
 338  * if this situation changes.
 339  *
 340  * Each open instance of a UVC device can either be in a privileged or
 341  * unprivileged state. Only a single instance can be in a privileged state at
 342  * a given time. Trying to perform an operation which requires privileges will
 343  * automatically acquire the required privileges if possible, or return -EBUSY
 344  * otherwise. Privileges are dismissed when closing the instance.
 345  *
 346  * Operations which require privileges are:
 347  *
 348  * - VIDIOC_S_INPUT
 349  * - VIDIOC_S_PARM
 350  * - VIDIOC_S_FMT
 351  * - VIDIOC_TRY_FMT
 352  * - VIDIOC_REQBUFS
 353  */
 354 static int uvc_acquire_privileges(struct uvc_fh *handle)
 355 {
 356         int ret = 0;
 357
 358         /* Always succeed if the handle is already privileged. */
 359         if (handle->state == UVC_HANDLE_ACTIVE)
 360                 return 0;
 361
 362         /* Check if the device already has a privileged handle. */
 363         mutex_lock(&uvc_driver.open_mutex);
 364         if (atomic_inc_return(&handle->device->active) != 1) {
 365                 atomic_dec(&handle->device->active);
 366                 ret = -EBUSY;
 367                 goto done;
 368         }
 369
 370         handle->state = UVC_HANDLE_ACTIVE;
 371
 372 done:
 373         mutex_unlock(&uvc_driver.open_mutex);
 374         return ret;
 375 }
 376
 377 static void uvc_dismiss_privileges(struct uvc_fh *handle)
 378 {
 379         if (handle->state == UVC_HANDLE_ACTIVE)
 380                 atomic_dec(&handle->device->active);
 381
 382         handle->state = UVC_HANDLE_PASSIVE;
 383 }
 384
 385 static int uvc_has_privileges(struct uvc_fh *handle)
 386 {
 387         return handle->state == UVC_HANDLE_ACTIVE;
 388 }
 389
 390 /* ------------------------------------------------------------------------
 391  * V4L2 file operations
 392  */
 393
 394 static int uvc_v4l2_open(struct inode *inode, struct file *file)
 395 {
 396         struct uvc_video_device *video;
 397         struct uvc_fh *handle;
 398         int ret = 0;
 399
 400         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
 401         mutex_lock(&uvc_driver.open_mutex);
 402         video = video_drvdata(file);
 403
 404         if (video->dev->state & UVC_DEV_DISCONNECTED) {
 405                 ret = -ENODEV;
 406                 goto done;
 407         }
 408
 409         ret = usb_autopm_get_interface(video->dev->intf);
 410         if (ret < 0)
 411                 goto done;
 412
 413         /* Create the device handle. */
 414         handle = kzalloc(sizeof *handle, GFP_KERNEL);
 415         if (handle == NULL) {
 416                 usb_autopm_put_interface(video->dev->intf);
 417                 ret = -ENOMEM;
 418                 goto done;
 419         }
 420
 421         handle->device = video;
 422         handle->state = UVC_HANDLE_PASSIVE;
 423         file->private_data = handle;
 424
 425         kref_get(&video->dev->kref);
 426
 427 done:
 428         mutex_unlock(&uvc_driver.open_mutex);
 429         return ret;
 430 }
 431
 432 static int uvc_v4l2_release(struct inode *inode, struct file *file)
 433 {
 434         struct uvc_video_device *video = video_drvdata(file);
 435         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 436
 437         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
 438
 439         /* Only free resources if this is a privileged handle. */
 440         if (uvc_has_privileges(handle)) {
 441                 uvc_video_enable(video, 0);
 442
 443                 mutex_lock(&video->queue.mutex);
 444                 if (uvc_free_buffers(&video->queue) < 0)
 445                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
 446                                         "free buffers.\n");
 447                 mutex_unlock(&video->queue.mutex);
 448         }
 449
 450         /* Release the file handle. */
 451         uvc_dismiss_privileges(handle);
 452         kfree(handle);
 453         file->private_data = NULL;
 454
 455         usb_autopm_put_interface(video->dev->intf);
 456         kref_put(&video->dev->kref, uvc_delete);
 457         return 0;
 458 }
 459
 460 static int uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 461 {
 462         struct video_device *vdev = video_devdata(file);
 463         struct uvc_video_device *video = video_get_drvdata(vdev);
 464         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
 465         int ret = 0;
 466
 467         switch (cmd) {
 468         /* Query capabilities */
 469         case VIDIOC_QUERYCAP:
 470         {
 471                 struct v4l2_capability *cap = arg;
 472
 473                 memset(cap, 0, sizeof *cap);
 474                 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
 475                 strncpy(cap->card, vdev->name, 32);
 476                 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
 477                         sizeof cap->bus_info);
 478                 cap->version = DRIVER_VERSION_NUMBER;
 479                 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 480                                   | V4L2_CAP_STREAMING;
 481                 break;
 482         }
 483
 484         /* Get, Set & Query control */
 485         case VIDIOC_QUERYCTRL:
 486                 return uvc_query_v4l2_ctrl(video, arg);
 487
 488         case VIDIOC_G_CTRL:
 489         {
 490                 struct v4l2_control *ctrl = arg;
 491                 struct v4l2_ext_control xctrl;
 492
 493                 memset(&xctrl, 0, sizeof xctrl);
 494                 xctrl.id = ctrl->id;
 495
 496                 uvc_ctrl_begin(video);
 497                 ret = uvc_ctrl_get(video, &xctrl);
 498                 uvc_ctrl_rollback(video);
 499                 if (ret >= 0)
 500                         ctrl->value = xctrl.value;
 501                 break;
 502         }
 503
 504         case VIDIOC_S_CTRL:
 505         {
 506                 struct v4l2_control *ctrl = arg;
 507                 struct v4l2_ext_control xctrl;
 508
 509                 memset(&xctrl, 0, sizeof xctrl);
 510                 xctrl.id = ctrl->id;
 511                 xctrl.value = ctrl->value;
 512
 513                 uvc_ctrl_begin(video);
 514                 ret = uvc_ctrl_set(video, &xctrl);
 515                 if (ret < 0) {
 516                         uvc_ctrl_rollback(video);
 517                         return ret;
 518                 }
 519                 ret = uvc_ctrl_commit(video);
 520                 break;
 521         }
 522
 523         case VIDIOC_QUERYMENU:
 524                 return uvc_v4l2_query_menu(video, arg);
 525
 526         case VIDIOC_G_EXT_CTRLS:
 527         {
 528                 struct v4l2_ext_controls *ctrls = arg;
 529                 struct v4l2_ext_control *ctrl = ctrls->controls;
 530                 unsigned int i;
 531
 532                 uvc_ctrl_begin(video);
 533                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 534                         ret = uvc_ctrl_get(video, ctrl);
 535                         if (ret < 0) {
 536                                 uvc_ctrl_rollback(video);
 537                                 ctrls->error_idx = i;
 538                                 return ret;
 539                         }
 540                 }
 541                 ctrls->error_idx = 0;
 542                 ret = uvc_ctrl_rollback(video);
 543                 break;
 544         }
 545
 546         case VIDIOC_S_EXT_CTRLS:
 547         case VIDIOC_TRY_EXT_CTRLS:
 548         {
 549                 struct v4l2_ext_controls *ctrls = arg;
 550                 struct v4l2_ext_control *ctrl = ctrls->controls;
 551                 unsigned int i;
 552
 553                 ret = uvc_ctrl_begin(video);
 554                 if (ret < 0)
 555                         return ret;
 556
 557                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
 558                         ret = uvc_ctrl_set(video, ctrl);
 559                         if (ret < 0) {
 560                                 uvc_ctrl_rollback(video);
 561                                 ctrls->error_idx = i;
 562                                 return ret;
 563                         }
 564                 }
 565
 566                 ctrls->error_idx = 0;
 567
 568                 if (cmd == VIDIOC_S_EXT_CTRLS)
 569                         ret = uvc_ctrl_commit(video);
 570                 else
 571                         ret = uvc_ctrl_rollback(video);
 572                 break;
 573         }
 574
 575         /* Get, Set & Enum input */
 576         case VIDIOC_ENUMINPUT:
 577         {
 578                 const struct uvc_entity *selector = video->selector;
 579                 struct v4l2_input *input = arg;
 580                 struct uvc_entity *iterm = NULL;
 581                 u32 index = input->index;
 582                 int pin = 0;
 583
 584                 if (selector == NULL ||
 585                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 586                         if (index != 0)
 587                                 return -EINVAL;
 588                         iterm = list_first_entry(&video->iterms,
 589                                         struct uvc_entity, chain);
 590                         pin = iterm->id;
 591                 } else if (pin < selector->selector.bNrInPins) {
 592                         pin = selector->selector.baSourceID[index];
 593                         list_for_each_entry(iterm, video->iterms.next, chain) {
 594                                 if (iterm->id == pin)
 595                                         break;
 596                         }
 597                 }
 598
 599                 if (iterm == NULL || iterm->id != pin)
 600                         return -EINVAL;
 601
 602                 memset(input, 0, sizeof *input);
 603                 input->index = index;
 604                 strncpy(input->name, iterm->name, sizeof input->name);
 605                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 606                         input->type = V4L2_INPUT_TYPE_CAMERA;
 607                 break;
 608         }
 609
 610         case VIDIOC_G_INPUT:
 611         {
 612                 u8 input;
 613
 614                 if (video->selector == NULL ||
 615                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 616                         *(int *)arg = 0;
 617                         break;
 618                 }
 619
 620                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
 621                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 622                         &input, 1);
 623                 if (ret < 0)
 624                         return ret;
 625
 626                 *(int *)arg = input - 1;
 627                 break;
 628         }
 629
 630         case VIDIOC_S_INPUT:
 631         {
 632                 u8 input = *(u32 *)arg + 1;
 633
 634                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 635                         return ret;
 636
 637                 if (video->selector == NULL ||
 638                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 639                         if (input != 1)
 640                                 return -EINVAL;
 641                         break;
 642                 }
 643
 644                 if (input > video->selector->selector.bNrInPins)
 645                         return -EINVAL;
 646
 647                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
 648                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
 649                         &input, 1);
 650         }
 651
 652         /* Try, Get, Set & Enum format */
 653         case VIDIOC_ENUM_FMT:
 654         {
 655                 struct v4l2_fmtdesc *fmt = arg;
 656                 struct uvc_format *format;
 657
 658                 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 659                     fmt->index >= video->streaming->nformats)
 660                         return -EINVAL;
 661
 662                 format = &video->streaming->format[fmt->index];
 663                 fmt->flags = 0;
 664                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 665                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
 666                 strncpy(fmt->description, format->name,
 667                         sizeof fmt->description);
 668                 fmt->description[sizeof fmt->description - 1] = 0;
 669                 fmt->pixelformat = format->fcc;
 670                 break;
 671         }
 672
 673         case VIDIOC_TRY_FMT:
 674         {
 675                 struct uvc_streaming_control probe;
 676
 677                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 678                         return ret;
 679
 680                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
 681         }
 682
 683         case VIDIOC_S_FMT:
 684                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 685                         return ret;
 686
 687                 return uvc_v4l2_set_format(video, arg);
 688
 689         case VIDIOC_G_FMT:
 690                 return uvc_v4l2_get_format(video, arg);
 691
 692         /* Frame size enumeration */
 693         case VIDIOC_ENUM_FRAMESIZES:
 694         {
 695                 struct v4l2_frmsizeenum *fsize = arg;
 696                 struct uvc_format *format = NULL;
 697                 struct uvc_frame *frame;
 698                 int i;
 699
 700                 /* Look for the given pixel format */
 701                 for (i = 0; i < video->streaming->nformats; i++) {
 702                         if (video->streaming->format[i].fcc ==
 703                                         fsize->pixel_format) {
 704                                 format = &video->streaming->format[i];
 705                                 break;
 706                         }
 707                 }
 708                 if (format == NULL)
 709                         return -EINVAL;
 710
 711                 if (fsize->index >= format->nframes)
 712                         return -EINVAL;
 713
 714                 frame = &format->frame[fsize->index];
 715                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
 716                 fsize->discrete.width = frame->wWidth;
 717                 fsize->discrete.height = frame->wHeight;
 718                 break;
 719         }
 720
 721         /* Frame interval enumeration */
 722         case VIDIOC_ENUM_FRAMEINTERVALS:
 723         {
 724                 struct v4l2_frmivalenum *fival = arg;
 725                 struct uvc_format *format = NULL;
 726                 struct uvc_frame *frame = NULL;
 727                 int i;
 728
 729                 /* Look for the given pixel format and frame size */
 730                 for (i = 0; i < video->streaming->nformats; i++) {
 731                         if (video->streaming->format[i].fcc ==
 732                                         fival->pixel_format) {
 733                                 format = &video->streaming->format[i];
 734                                 break;
 735                         }
 736                 }
 737                 if (format == NULL)
 738                         return -EINVAL;
 739
 740                 for (i = 0; i < format->nframes; i++) {
 741                         if (format->frame[i].wWidth == fival->width &&
 742                             format->frame[i].wHeight == fival->height) {
 743                                 frame = &format->frame[i];
 744                                 break;
 745                         }
 746                 }
 747                 if (frame == NULL)
 748                         return -EINVAL;
 749
 750                 if (frame->bFrameIntervalType) {
 751                         if (fival->index >= frame->bFrameIntervalType)
 752                                 return -EINVAL;
 753
 754                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
 755                         fival->discrete.numerator =
 756                                 frame->dwFrameInterval[fival->index];
 757                         fival->discrete.denominator = 10000000;
 758                         uvc_simplify_fraction(&fival->discrete.numerator,
 759                                 &fival->discrete.denominator, 8, 333);
 760                 } else {
 761                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
 762                         fival->stepwise.min.numerator =
 763                                 frame->dwFrameInterval[0];
 764                         fival->stepwise.min.denominator = 10000000;
 765                         fival->stepwise.max.numerator =
 766                                 frame->dwFrameInterval[1];
 767                         fival->stepwise.max.denominator = 10000000;
 768                         fival->stepwise.step.numerator =
 769                                 frame->dwFrameInterval[2];
 770                         fival->stepwise.step.denominator = 10000000;
 771                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
 772                                 &fival->stepwise.min.denominator, 8, 333);
 773                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
 774                                 &fival->stepwise.max.denominator, 8, 333);
 775                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
 776                                 &fival->stepwise.step.denominator, 8, 333);
 777                 }
 778                 break;
 779         }
 780
 781         /* Get & Set streaming parameters */
 782         case VIDIOC_G_PARM:
 783                 return uvc_v4l2_get_streamparm(video, arg);
 784
 785         case VIDIOC_S_PARM:
 786                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 787                         return ret;
 788
 789                 return uvc_v4l2_set_streamparm(video, arg);
 790
 791         /* Cropping and scaling */
 792         case VIDIOC_CROPCAP:
 793         {
 794                 struct v4l2_cropcap *ccap = arg;
 795                 struct uvc_frame *frame = video->streaming->cur_frame;
 796
 797                 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 798                         return -EINVAL;
 799
 800                 ccap->bounds.left = 0;
 801                 ccap->bounds.top = 0;
 802                 ccap->bounds.width = frame->wWidth;
 803                 ccap->bounds.height = frame->wHeight;
 804
 805                 ccap->defrect = ccap->bounds;
 806
 807                 ccap->pixelaspect.numerator = 1;
 808                 ccap->pixelaspect.denominator = 1;
 809                 break;
 810         }
 811
 812         case VIDIOC_G_CROP:
 813         case VIDIOC_S_CROP:
 814                 return -EINVAL;
 815
 816         /* Buffers & streaming */
 817         case VIDIOC_REQBUFS:
 818         {
 819                 struct v4l2_requestbuffers *rb = arg;
 820                 unsigned int bufsize =
 821                         video->streaming->ctrl.dwMaxVideoFrameSize;
 822
 823                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 824                     rb->memory != V4L2_MEMORY_MMAP)
 825                         return -EINVAL;
 826
 827                 if ((ret = uvc_acquire_privileges(handle)) < 0)
 828                         return ret;
 829
 830                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
 831                 if (ret < 0)
 832                         return ret;
 833
 834                 rb->count = ret;
 835                 ret = 0;
 836                 break;
 837         }
 838
 839         case VIDIOC_QUERYBUF:
 840         {
 841                 struct v4l2_buffer *buf = arg;
 842
 843                 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 844                         return -EINVAL;
 845
 846                 if (!uvc_has_privileges(handle))
 847                         return -EBUSY;
 848
 849                 return uvc_query_buffer(&video->queue, buf);
 850         }
 851
 852         case VIDIOC_QBUF:
 853                 if (!uvc_has_privileges(handle))
 854                         return -EBUSY;
 855
 856                 return uvc_queue_buffer(&video->queue, arg);
 857
 858         case VIDIOC_DQBUF:
 859                 if (!uvc_has_privileges(handle))
 860                         return -EBUSY;
 861
 862                 return uvc_dequeue_buffer(&video->queue, arg,
 863                         file->f_flags & O_NONBLOCK);
 864
 865         case VIDIOC_STREAMON:
 866         {
 867                 int *type = arg;
 868
 869                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 870                         return -EINVAL;
 871
 872                 if (!uvc_has_privileges(handle))
 873                         return -EBUSY;
 874
 875                 if ((ret = uvc_video_enable(video, 1)) < 0)
 876                         return ret;
 877                 break;
 878         }
 879
 880         case VIDIOC_STREAMOFF:
 881         {
 882                 int *type = arg;
 883
 884                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 885                         return -EINVAL;
 886
 887                 if (!uvc_has_privileges(handle))
 888                         return -EBUSY;
 889
 890                 return uvc_video_enable(video, 0);
 891         }
 892
 893         /* Analog video standards make no sense for digital cameras. */
 894         case VIDIOC_ENUMSTD:
 895         case VIDIOC_QUERYSTD:
 896         case VIDIOC_G_STD:
 897         case VIDIOC_S_STD:
 898
 899         case VIDIOC_OVERLAY:
 900
 901         case VIDIOC_ENUMAUDIO:
 902         case VIDIOC_ENUMAUDOUT:
 903
 904         case VIDIOC_ENUMOUTPUT:
 905                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
 906                 return -EINVAL;
 907
 908         /* Dynamic controls. */
 909         case UVCIOC_CTRL_ADD:
 910         {
 911                 struct uvc_xu_control_info *xinfo = arg;
 912                 struct uvc_control_info *info;
 913
 914                 if (!capable(CAP_SYS_ADMIN))
 915                         return -EPERM;
 916
 917                 info = kzalloc(sizeof *info, GFP_KERNEL);
 918                 if (info == NULL)
 919                         return -ENOMEM;
 920
 921                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
 922                 info->index = xinfo->index;
 923                 info->selector = xinfo->selector;
 924                 info->size = xinfo->size;
 925                 info->flags = xinfo->flags;
 926
 927                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
 928                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
 929
 930                 ret = uvc_ctrl_add_info(info);
 931                 if (ret < 0)
 932                         kfree(info);
 933                 break;
 934         }
 935
 936         case UVCIOC_CTRL_MAP:
 937         {
 938                 struct uvc_xu_control_mapping *xmap = arg;
 939                 struct uvc_control_mapping *map;
 940
 941                 if (!capable(CAP_SYS_ADMIN))
 942                         return -EPERM;
 943
 944                 map = kzalloc(sizeof *map, GFP_KERNEL);
 945                 if (map == NULL)
 946                         return -ENOMEM;
 947
 948                 map->id = xmap->id;
 949                 memcpy(map->name, xmap->name, sizeof map->name);
 950                 memcpy(map->entity, xmap->entity, sizeof map->entity);
 951                 map->selector = xmap->selector;
 952                 map->size = xmap->size;
 953                 map->offset = xmap->offset;
 954                 map->v4l2_type = xmap->v4l2_type;
 955                 map->data_type = xmap->data_type;
 956
 957                 ret = uvc_ctrl_add_mapping(map);
 958                 if (ret < 0)
 959                         kfree(map);
 960                 break;
 961         }
 962
 963         case UVCIOC_CTRL_GET:
 964                 return uvc_xu_ctrl_query(video, arg, 0);
 965
 966         case UVCIOC_CTRL_SET:
 967                 return uvc_xu_ctrl_query(video, arg, 1);
 968
 969         default:
 970                 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
 971                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
 972                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
 973                                   cmd);
 974                 return ret;
 975         }
 976
 977         return ret;
 978 }
 979
 980 static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
 981                      unsigned int cmd, unsigned long arg)
 982 {
 983         if (uvc_trace_param & UVC_TRACE_IOCTL) {
 984                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
 985                 v4l_printk_ioctl(cmd);
 986                 printk(")\n");
 987         }
 988
 989         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
 990 }
 991
 992 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
 993                     size_t count, loff_t *ppos)
 994 {
 995         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
 996         return -ENODEV;
 997 }
 998
 999 /*
1000  * VMA operations.
1001  */
1002 static void uvc_vm_open(struct vm_area_struct *vma)
1003 {
1004         struct uvc_buffer *buffer = vma->vm_private_data;
1005         buffer->vma_use_count++;
1006 }
1007
1008 static void uvc_vm_close(struct vm_area_struct *vma)
1009 {
1010         struct uvc_buffer *buffer = vma->vm_private_data;
1011         buffer->vma_use_count--;
1012 }
1013
1014 static struct vm_operations_struct uvc_vm_ops = {
1015         .open           = uvc_vm_open,
1016         .close          = uvc_vm_close,
1017 };
1018
1019 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1020 {
1021         struct uvc_video_device *video = video_drvdata(file);
1022         struct uvc_buffer *uninitialized_var(buffer);
1023         struct page *page;
1024         unsigned long addr, start, size;
1025         unsigned int i;
1026         int ret = 0;
1027
1028         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1029
1030         start = vma->vm_start;
1031         size = vma->vm_end - vma->vm_start;
1032
1033         mutex_lock(&video->queue.mutex);
1034
1035         for (i = 0; i < video->queue.count; ++i) {
1036                 buffer = &video->queue.buffer[i];
1037                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1038                         break;
1039         }
1040
1041         if (i == video->queue.count || size != video->queue.buf_size) {
1042                 ret = -EINVAL;
1043                 goto done;
1044         }
1045
1046         /*
1047          * VM_IO marks the area as being an mmaped region for I/O to a
1048          * device. It also prevents the region from being core dumped.
1049          */
1050         vma->vm_flags |= VM_IO;
1051
1052         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1053         while (size > 0) {
1054                 page = vmalloc_to_page((void *)addr);
1055                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1056                         goto done;
1057
1058                 start += PAGE_SIZE;
1059                 addr += PAGE_SIZE;
1060                 size -= PAGE_SIZE;
1061         }
1062
1063         vma->vm_ops = &uvc_vm_ops;
1064         vma->vm_private_data = buffer;
1065         uvc_vm_open(vma);
1066
1067 done:
1068         mutex_unlock(&video->queue.mutex);
1069         return ret;
1070 }
1071
1072 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1073 {
1074         struct uvc_video_device *video = video_drvdata(file);
1075
1076         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1077
1078         return uvc_queue_poll(&video->queue, file, wait);
1079 }
1080
1081 struct file_operations uvc_fops = {
1082         .owner          = THIS_MODULE,
1083         .open           = uvc_v4l2_open,
1084         .release        = uvc_v4l2_release,
1085         .ioctl          = uvc_v4l2_ioctl,
1086         .compat_ioctl   = v4l_compat_ioctl32,
1087         .llseek         = no_llseek,
1088         .read           = uvc_v4l2_read,
1089         .mmap           = uvc_v4l2_mmap,
1090         .poll           = uvc_v4l2_poll,
1091 };
1092