Merge branch 'linus' into cpus4096
[linux-2.6] / drivers / media / video / uvc / uvc_v4l2.c
1 /*
2  *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
3  *
4  *      Copyright (C) 2005-2008
5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
6  *
7  *      This program is free software; you can redistribute it and/or modify
8  *      it under the terms of the GNU General Public License as published by
9  *      the Free Software Foundation; either version 2 of the License, or
10  *      (at your option) any later version.
11  *
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/version.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/usb.h>
19 #include <linux/videodev2.h>
20 #include <linux/vmalloc.h>
21 #include <linux/mm.h>
22 #include <linux/wait.h>
23 #include <asm/atomic.h>
24
25 #include <media/v4l2-common.h>
26 #include <media/v4l2-ioctl.h>
27
28 #include "uvcvideo.h"
29
30 /* ------------------------------------------------------------------------
31  * V4L2 interface
32  */
33
34 /*
35  * Mapping V4L2 controls to UVC controls can be straighforward if done well.
36  * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
37  * must be grouped (for instance the Red Balance, Blue Balance and Do White
38  * Balance V4L2 controls use the White Balance Component UVC control) or
39  * otherwise translated. The approach we take here is to use a translation
40  * table for the controls which can be mapped directly, and handle the others
41  * manually.
42  */
43 static int uvc_v4l2_query_menu(struct uvc_video_device *video,
44         struct v4l2_querymenu *query_menu)
45 {
46         struct uvc_menu_info *menu_info;
47         struct uvc_control_mapping *mapping;
48         struct uvc_control *ctrl;
49
50         ctrl = uvc_find_control(video, query_menu->id, &mapping);
51         if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
52                 return -EINVAL;
53
54         if (query_menu->index >= mapping->menu_count)
55                 return -EINVAL;
56
57         menu_info = &mapping->menu_info[query_menu->index];
58         strncpy(query_menu->name, menu_info->name, 32);
59         return 0;
60 }
61
62 /*
63  * Find the frame interval closest to the requested frame interval for the
64  * given frame format and size. This should be done by the device as part of
65  * the Video Probe and Commit negotiation, but some hardware don't implement
66  * that feature.
67  */
68 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
69 {
70         unsigned int i;
71
72         if (frame->bFrameIntervalType) {
73                 __u32 best = -1, dist;
74
75                 for (i = 0; i < frame->bFrameIntervalType; ++i) {
76                         dist = interval > frame->dwFrameInterval[i]
77                              ? interval - frame->dwFrameInterval[i]
78                              : frame->dwFrameInterval[i] - interval;
79
80                         if (dist > best)
81                                 break;
82
83                         best = dist;
84                 }
85
86                 interval = frame->dwFrameInterval[i-1];
87         } else {
88                 const __u32 min = frame->dwFrameInterval[0];
89                 const __u32 max = frame->dwFrameInterval[1];
90                 const __u32 step = frame->dwFrameInterval[2];
91
92                 interval = min + (interval - min + step/2) / step * step;
93                 if (interval > max)
94                         interval = max;
95         }
96
97         return interval;
98 }
99
100 static int uvc_v4l2_try_format(struct uvc_video_device *video,
101         struct v4l2_format *fmt, struct uvc_streaming_control *probe,
102         struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
103 {
104         struct uvc_format *format = NULL;
105         struct uvc_frame *frame = NULL;
106         __u16 rw, rh;
107         unsigned int d, maxd;
108         unsigned int i;
109         __u32 interval;
110         int ret = 0;
111         __u8 *fcc;
112
113         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
114                 return -EINVAL;
115
116         fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
117         uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
118                         fmt->fmt.pix.pixelformat,
119                         fcc[0], fcc[1], fcc[2], fcc[3],
120                         fmt->fmt.pix.width, fmt->fmt.pix.height);
121
122         /* Check if the hardware supports the requested format. */
123         for (i = 0; i < video->streaming->nformats; ++i) {
124                 format = &video->streaming->format[i];
125                 if (format->fcc == fmt->fmt.pix.pixelformat)
126                         break;
127         }
128
129         if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
130                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
131                                 fmt->fmt.pix.pixelformat);
132                 return -EINVAL;
133         }
134
135         /* Find the closest image size. The distance between image sizes is
136          * the size in pixels of the non-overlapping regions between the
137          * requested size and the frame-specified size.
138          */
139         rw = fmt->fmt.pix.width;
140         rh = fmt->fmt.pix.height;
141         maxd = (unsigned int)-1;
142
143         for (i = 0; i < format->nframes; ++i) {
144                 __u16 w = format->frame[i].wWidth;
145                 __u16 h = format->frame[i].wHeight;
146
147                 d = min(w, rw) * min(h, rh);
148                 d = w*h + rw*rh - 2*d;
149                 if (d < maxd) {
150                         maxd = d;
151                         frame = &format->frame[i];
152                 }
153
154                 if (maxd == 0)
155                         break;
156         }
157
158         if (frame == NULL) {
159                 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
160                                 fmt->fmt.pix.width, fmt->fmt.pix.height);
161                 return -EINVAL;
162         }
163
164         /* Use the default frame interval. */
165         interval = frame->dwDefaultFrameInterval;
166         uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
167                 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
168                 (100000000/interval)%10);
169
170         /* Set the format index, frame index and frame interval. */
171         memset(probe, 0, sizeof *probe);
172         probe->bmHint = 1;      /* dwFrameInterval */
173         probe->bFormatIndex = format->index;
174         probe->bFrameIndex = frame->bFrameIndex;
175         probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
176         /* Some webcams stall the probe control set request when the
177          * dwMaxVideoFrameSize field is set to zero. The UVC specification
178          * clearly states that the field is read-only from the host, so this
179          * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
180          * the webcam to work around the problem.
181          *
182          * The workaround could probably be enabled for all webcams, so the
183          * quirk can be removed if needed. It's currently useful to detect
184          * webcam bugs and fix them before they hit the market (providing
185          * developers test their webcams with the Linux driver as well as with
186          * the Windows driver).
187          */
188         if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
189                 probe->dwMaxVideoFrameSize =
190                         video->streaming->ctrl.dwMaxVideoFrameSize;
191
192         /* Probe the device */
193         if ((ret = uvc_probe_video(video, probe)) < 0)
194                 goto done;
195
196         fmt->fmt.pix.width = frame->wWidth;
197         fmt->fmt.pix.height = frame->wHeight;
198         fmt->fmt.pix.field = V4L2_FIELD_NONE;
199         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
200         fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
201         fmt->fmt.pix.colorspace = format->colorspace;
202         fmt->fmt.pix.priv = 0;
203
204         if (uvc_format != NULL)
205                 *uvc_format = format;
206         if (uvc_frame != NULL)
207                 *uvc_frame = frame;
208
209 done:
210         return ret;
211 }
212
213 static int uvc_v4l2_get_format(struct uvc_video_device *video,
214         struct v4l2_format *fmt)
215 {
216         struct uvc_format *format = video->streaming->cur_format;
217         struct uvc_frame *frame = video->streaming->cur_frame;
218
219         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
220                 return -EINVAL;
221
222         if (format == NULL || frame == NULL)
223                 return -EINVAL;
224
225         fmt->fmt.pix.pixelformat = format->fcc;
226         fmt->fmt.pix.width = frame->wWidth;
227         fmt->fmt.pix.height = frame->wHeight;
228         fmt->fmt.pix.field = V4L2_FIELD_NONE;
229         fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
230         fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
231         fmt->fmt.pix.colorspace = format->colorspace;
232         fmt->fmt.pix.priv = 0;
233
234         return 0;
235 }
236
237 static int uvc_v4l2_set_format(struct uvc_video_device *video,
238         struct v4l2_format *fmt)
239 {
240         struct uvc_streaming_control probe;
241         struct uvc_format *format;
242         struct uvc_frame *frame;
243         int ret;
244
245         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
246                 return -EINVAL;
247
248         if (uvc_queue_streaming(&video->queue))
249                 return -EBUSY;
250
251         ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
252         if (ret < 0)
253                 return ret;
254
255         if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
256                 return ret;
257
258         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
259         video->streaming->cur_format = format;
260         video->streaming->cur_frame = frame;
261
262         return 0;
263 }
264
265 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
266                 struct v4l2_streamparm *parm)
267 {
268         uint32_t numerator, denominator;
269
270         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
271                 return -EINVAL;
272
273         numerator = video->streaming->ctrl.dwFrameInterval;
274         denominator = 10000000;
275         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
276
277         memset(parm, 0, sizeof *parm);
278         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
279         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
280         parm->parm.capture.capturemode = 0;
281         parm->parm.capture.timeperframe.numerator = numerator;
282         parm->parm.capture.timeperframe.denominator = denominator;
283         parm->parm.capture.extendedmode = 0;
284         parm->parm.capture.readbuffers = 0;
285
286         return 0;
287 }
288
289 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
290                 struct v4l2_streamparm *parm)
291 {
292         struct uvc_frame *frame = video->streaming->cur_frame;
293         struct uvc_streaming_control probe;
294         uint32_t interval;
295         int ret;
296
297         if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
298                 return -EINVAL;
299
300         if (uvc_queue_streaming(&video->queue))
301                 return -EBUSY;
302
303         memcpy(&probe, &video->streaming->ctrl, sizeof probe);
304         interval = uvc_fraction_to_interval(
305                         parm->parm.capture.timeperframe.numerator,
306                         parm->parm.capture.timeperframe.denominator);
307
308         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
309                         parm->parm.capture.timeperframe.numerator,
310                         parm->parm.capture.timeperframe.denominator,
311                         interval);
312         probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
313
314         /* Probe the device with the new settings. */
315         if ((ret = uvc_probe_video(video, &probe)) < 0)
316                 return ret;
317
318         /* Commit the new settings. */
319         if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
320                 return ret;
321
322         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
323
324         /* Return the actual frame period. */
325         parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
326         parm->parm.capture.timeperframe.denominator = 10000000;
327         uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
328                                 &parm->parm.capture.timeperframe.denominator,
329                                 8, 333);
330
331         return 0;
332 }
333
334 /* ------------------------------------------------------------------------
335  * Privilege management
336  */
337
338 /*
339  * Privilege management is the multiple-open implementation basis. The current
340  * implementation is completely transparent for the end-user and doesn't
341  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
342  * Those ioctls enable finer control on the device (by making possible for a
343  * user to request exclusive access to a device), but are not mature yet.
344  * Switching to the V4L2 priority mechanism might be considered in the future
345  * if this situation changes.
346  *
347  * Each open instance of a UVC device can either be in a privileged or
348  * unprivileged state. Only a single instance can be in a privileged state at
349  * a given time. Trying to perform an operation which requires privileges will
350  * automatically acquire the required privileges if possible, or return -EBUSY
351  * otherwise. Privileges are dismissed when closing the instance.
352  *
353  * Operations which require privileges are:
354  *
355  * - VIDIOC_S_INPUT
356  * - VIDIOC_S_PARM
357  * - VIDIOC_S_FMT
358  * - VIDIOC_TRY_FMT
359  * - VIDIOC_REQBUFS
360  */
361 static int uvc_acquire_privileges(struct uvc_fh *handle)
362 {
363         int ret = 0;
364
365         /* Always succeed if the handle is already privileged. */
366         if (handle->state == UVC_HANDLE_ACTIVE)
367                 return 0;
368
369         /* Check if the device already has a privileged handle. */
370         mutex_lock(&uvc_driver.open_mutex);
371         if (atomic_inc_return(&handle->device->active) != 1) {
372                 atomic_dec(&handle->device->active);
373                 ret = -EBUSY;
374                 goto done;
375         }
376
377         handle->state = UVC_HANDLE_ACTIVE;
378
379 done:
380         mutex_unlock(&uvc_driver.open_mutex);
381         return ret;
382 }
383
384 static void uvc_dismiss_privileges(struct uvc_fh *handle)
385 {
386         if (handle->state == UVC_HANDLE_ACTIVE)
387                 atomic_dec(&handle->device->active);
388
389         handle->state = UVC_HANDLE_PASSIVE;
390 }
391
392 static int uvc_has_privileges(struct uvc_fh *handle)
393 {
394         return handle->state == UVC_HANDLE_ACTIVE;
395 }
396
397 /* ------------------------------------------------------------------------
398  * V4L2 file operations
399  */
400
401 static int uvc_v4l2_open(struct inode *inode, struct file *file)
402 {
403         struct video_device *vdev;
404         struct uvc_video_device *video;
405         struct uvc_fh *handle;
406         int ret = 0;
407
408         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
409         mutex_lock(&uvc_driver.open_mutex);
410         vdev = video_devdata(file);
411         video = video_get_drvdata(vdev);
412
413         if (video->dev->state & UVC_DEV_DISCONNECTED) {
414                 ret = -ENODEV;
415                 goto done;
416         }
417
418         ret = usb_autopm_get_interface(video->dev->intf);
419         if (ret < 0)
420                 goto done;
421
422         /* Create the device handle. */
423         handle = kzalloc(sizeof *handle, GFP_KERNEL);
424         if (handle == NULL) {
425                 usb_autopm_put_interface(video->dev->intf);
426                 ret = -ENOMEM;
427                 goto done;
428         }
429
430         handle->device = video;
431         handle->state = UVC_HANDLE_PASSIVE;
432         file->private_data = handle;
433
434         kref_get(&video->dev->kref);
435
436 done:
437         mutex_unlock(&uvc_driver.open_mutex);
438         return ret;
439 }
440
441 static int uvc_v4l2_release(struct inode *inode, struct file *file)
442 {
443         struct video_device *vdev = video_devdata(file);
444         struct uvc_video_device *video = video_get_drvdata(vdev);
445         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
446
447         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
448
449         /* Only free resources if this is a privileged handle. */
450         if (uvc_has_privileges(handle)) {
451                 uvc_video_enable(video, 0);
452
453                 mutex_lock(&video->queue.mutex);
454                 if (uvc_free_buffers(&video->queue) < 0)
455                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
456                                         "free buffers.\n");
457                 mutex_unlock(&video->queue.mutex);
458         }
459
460         /* Release the file handle. */
461         uvc_dismiss_privileges(handle);
462         kfree(handle);
463         file->private_data = NULL;
464
465         usb_autopm_put_interface(video->dev->intf);
466         kref_put(&video->dev->kref, uvc_delete);
467         return 0;
468 }
469
470 static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
471                      unsigned int cmd, void *arg)
472 {
473         struct video_device *vdev = video_devdata(file);
474         struct uvc_video_device *video = video_get_drvdata(vdev);
475         struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
476         int ret = 0;
477
478         if (uvc_trace_param & UVC_TRACE_IOCTL)
479                 v4l_printk_ioctl(cmd);
480
481         switch (cmd) {
482         /* Query capabilities */
483         case VIDIOC_QUERYCAP:
484         {
485                 struct v4l2_capability *cap = arg;
486
487                 memset(cap, 0, sizeof *cap);
488                 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
489                 strncpy(cap->card, vdev->name, 32);
490                 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
491                         sizeof cap->bus_info);
492                 cap->version = DRIVER_VERSION_NUMBER;
493                 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
494                                   | V4L2_CAP_STREAMING;
495                 break;
496         }
497
498         /* Get, Set & Query control */
499         case VIDIOC_QUERYCTRL:
500                 return uvc_query_v4l2_ctrl(video, arg);
501
502         case VIDIOC_G_CTRL:
503         {
504                 struct v4l2_control *ctrl = arg;
505                 struct v4l2_ext_control xctrl;
506
507                 memset(&xctrl, 0, sizeof xctrl);
508                 xctrl.id = ctrl->id;
509
510                 uvc_ctrl_begin(video);
511                 ret = uvc_ctrl_get(video, &xctrl);
512                 uvc_ctrl_rollback(video);
513                 if (ret >= 0)
514                         ctrl->value = xctrl.value;
515                 break;
516         }
517
518         case VIDIOC_S_CTRL:
519         {
520                 struct v4l2_control *ctrl = arg;
521                 struct v4l2_ext_control xctrl;
522
523                 memset(&xctrl, 0, sizeof xctrl);
524                 xctrl.id = ctrl->id;
525                 xctrl.value = ctrl->value;
526
527                 uvc_ctrl_begin(video);
528                 ret = uvc_ctrl_set(video, &xctrl);
529                 if (ret < 0) {
530                         uvc_ctrl_rollback(video);
531                         return ret;
532                 }
533                 ret = uvc_ctrl_commit(video);
534                 break;
535         }
536
537         case VIDIOC_QUERYMENU:
538                 return uvc_v4l2_query_menu(video, arg);
539
540         case VIDIOC_G_EXT_CTRLS:
541         {
542                 struct v4l2_ext_controls *ctrls = arg;
543                 struct v4l2_ext_control *ctrl = ctrls->controls;
544                 unsigned int i;
545
546                 uvc_ctrl_begin(video);
547                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
548                         ret = uvc_ctrl_get(video, ctrl);
549                         if (ret < 0) {
550                                 uvc_ctrl_rollback(video);
551                                 ctrls->error_idx = i;
552                                 return ret;
553                         }
554                 }
555                 ctrls->error_idx = 0;
556                 ret = uvc_ctrl_rollback(video);
557                 break;
558         }
559
560         case VIDIOC_S_EXT_CTRLS:
561         case VIDIOC_TRY_EXT_CTRLS:
562         {
563                 struct v4l2_ext_controls *ctrls = arg;
564                 struct v4l2_ext_control *ctrl = ctrls->controls;
565                 unsigned int i;
566
567                 ret = uvc_ctrl_begin(video);
568                 if (ret < 0)
569                         return ret;
570
571                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
572                         ret = uvc_ctrl_set(video, ctrl);
573                         if (ret < 0) {
574                                 uvc_ctrl_rollback(video);
575                                 ctrls->error_idx = i;
576                                 return ret;
577                         }
578                 }
579
580                 ctrls->error_idx = 0;
581
582                 if (cmd == VIDIOC_S_EXT_CTRLS)
583                         ret = uvc_ctrl_commit(video);
584                 else
585                         ret = uvc_ctrl_rollback(video);
586                 break;
587         }
588
589         /* Get, Set & Enum input */
590         case VIDIOC_ENUMINPUT:
591         {
592                 const struct uvc_entity *selector = video->selector;
593                 struct v4l2_input *input = arg;
594                 struct uvc_entity *iterm = NULL;
595                 u32 index = input->index;
596                 int pin = 0;
597
598                 if (selector == NULL ||
599                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
600                         if (index != 0)
601                                 return -EINVAL;
602                         iterm = list_first_entry(&video->iterms,
603                                         struct uvc_entity, chain);
604                         pin = iterm->id;
605                 } else if (pin < selector->selector.bNrInPins) {
606                         pin = selector->selector.baSourceID[index];
607                         list_for_each_entry(iterm, video->iterms.next, chain) {
608                                 if (iterm->id == pin)
609                                         break;
610                         }
611                 }
612
613                 if (iterm == NULL || iterm->id != pin)
614                         return -EINVAL;
615
616                 memset(input, 0, sizeof *input);
617                 input->index = index;
618                 strncpy(input->name, iterm->name, sizeof input->name);
619                 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
620                         input->type = V4L2_INPUT_TYPE_CAMERA;
621                 break;
622         }
623
624         case VIDIOC_G_INPUT:
625         {
626                 u8 input;
627
628                 if (video->selector == NULL ||
629                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
630                         *(int *)arg = 0;
631                         break;
632                 }
633
634                 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
635                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
636                         &input, 1);
637                 if (ret < 0)
638                         return ret;
639
640                 *(int *)arg = input - 1;
641                 break;
642         }
643
644         case VIDIOC_S_INPUT:
645         {
646                 u8 input = *(u32 *)arg + 1;
647
648                 if ((ret = uvc_acquire_privileges(handle)) < 0)
649                         return ret;
650
651                 if (video->selector == NULL ||
652                     (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
653                         if (input != 1)
654                                 return -EINVAL;
655                         break;
656                 }
657
658                 if (input > video->selector->selector.bNrInPins)
659                         return -EINVAL;
660
661                 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
662                         video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
663                         &input, 1);
664         }
665
666         /* Try, Get, Set & Enum format */
667         case VIDIOC_ENUM_FMT:
668         {
669                 struct v4l2_fmtdesc *fmt = arg;
670                 struct uvc_format *format;
671
672                 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
673                     fmt->index >= video->streaming->nformats)
674                         return -EINVAL;
675
676                 format = &video->streaming->format[fmt->index];
677                 fmt->flags = 0;
678                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
679                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
680                 strncpy(fmt->description, format->name,
681                         sizeof fmt->description);
682                 fmt->description[sizeof fmt->description - 1] = 0;
683                 fmt->pixelformat = format->fcc;
684                 break;
685         }
686
687         case VIDIOC_TRY_FMT:
688         {
689                 struct uvc_streaming_control probe;
690
691                 if ((ret = uvc_acquire_privileges(handle)) < 0)
692                         return ret;
693
694                 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
695         }
696
697         case VIDIOC_S_FMT:
698                 if ((ret = uvc_acquire_privileges(handle)) < 0)
699                         return ret;
700
701                 return uvc_v4l2_set_format(video, arg);
702
703         case VIDIOC_G_FMT:
704                 return uvc_v4l2_get_format(video, arg);
705
706         /* Frame size enumeration */
707         case VIDIOC_ENUM_FRAMESIZES:
708         {
709                 struct v4l2_frmsizeenum *fsize = arg;
710                 struct uvc_format *format = NULL;
711                 struct uvc_frame *frame;
712                 int i;
713
714                 /* Look for the given pixel format */
715                 for (i = 0; i < video->streaming->nformats; i++) {
716                         if (video->streaming->format[i].fcc ==
717                                         fsize->pixel_format) {
718                                 format = &video->streaming->format[i];
719                                 break;
720                         }
721                 }
722                 if (format == NULL)
723                         return -EINVAL;
724
725                 if (fsize->index >= format->nframes)
726                         return -EINVAL;
727
728                 frame = &format->frame[fsize->index];
729                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
730                 fsize->discrete.width = frame->wWidth;
731                 fsize->discrete.height = frame->wHeight;
732                 break;
733         }
734
735         /* Frame interval enumeration */
736         case VIDIOC_ENUM_FRAMEINTERVALS:
737         {
738                 struct v4l2_frmivalenum *fival = arg;
739                 struct uvc_format *format = NULL;
740                 struct uvc_frame *frame = NULL;
741                 int i;
742
743                 /* Look for the given pixel format and frame size */
744                 for (i = 0; i < video->streaming->nformats; i++) {
745                         if (video->streaming->format[i].fcc ==
746                                         fival->pixel_format) {
747                                 format = &video->streaming->format[i];
748                                 break;
749                         }
750                 }
751                 if (format == NULL)
752                         return -EINVAL;
753
754                 for (i = 0; i < format->nframes; i++) {
755                         if (format->frame[i].wWidth == fival->width &&
756                             format->frame[i].wHeight == fival->height) {
757                                 frame = &format->frame[i];
758                                 break;
759                         }
760                 }
761                 if (frame == NULL)
762                         return -EINVAL;
763
764                 if (frame->bFrameIntervalType) {
765                         if (fival->index >= frame->bFrameIntervalType)
766                                 return -EINVAL;
767
768                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
769                         fival->discrete.numerator =
770                                 frame->dwFrameInterval[fival->index];
771                         fival->discrete.denominator = 10000000;
772                         uvc_simplify_fraction(&fival->discrete.numerator,
773                                 &fival->discrete.denominator, 8, 333);
774                 } else {
775                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
776                         fival->stepwise.min.numerator =
777                                 frame->dwFrameInterval[0];
778                         fival->stepwise.min.denominator = 10000000;
779                         fival->stepwise.max.numerator =
780                                 frame->dwFrameInterval[1];
781                         fival->stepwise.max.denominator = 10000000;
782                         fival->stepwise.step.numerator =
783                                 frame->dwFrameInterval[2];
784                         fival->stepwise.step.denominator = 10000000;
785                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
786                                 &fival->stepwise.min.denominator, 8, 333);
787                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
788                                 &fival->stepwise.max.denominator, 8, 333);
789                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
790                                 &fival->stepwise.step.denominator, 8, 333);
791                 }
792                 break;
793         }
794
795         /* Get & Set streaming parameters */
796         case VIDIOC_G_PARM:
797                 return uvc_v4l2_get_streamparm(video, arg);
798
799         case VIDIOC_S_PARM:
800                 if ((ret = uvc_acquire_privileges(handle)) < 0)
801                         return ret;
802
803                 return uvc_v4l2_set_streamparm(video, arg);
804
805         /* Cropping and scaling */
806         case VIDIOC_CROPCAP:
807         {
808                 struct v4l2_cropcap *ccap = arg;
809                 struct uvc_frame *frame = video->streaming->cur_frame;
810
811                 if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
812                         return -EINVAL;
813
814                 ccap->bounds.left = 0;
815                 ccap->bounds.top = 0;
816                 ccap->bounds.width = frame->wWidth;
817                 ccap->bounds.height = frame->wHeight;
818
819                 ccap->defrect = ccap->bounds;
820
821                 ccap->pixelaspect.numerator = 1;
822                 ccap->pixelaspect.denominator = 1;
823                 break;
824         }
825
826         case VIDIOC_G_CROP:
827         case VIDIOC_S_CROP:
828                 return -EINVAL;
829
830         /* Buffers & streaming */
831         case VIDIOC_REQBUFS:
832         {
833                 struct v4l2_requestbuffers *rb = arg;
834                 unsigned int bufsize =
835                         video->streaming->ctrl.dwMaxVideoFrameSize;
836
837                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
838                     rb->memory != V4L2_MEMORY_MMAP)
839                         return -EINVAL;
840
841                 if ((ret = uvc_acquire_privileges(handle)) < 0)
842                         return ret;
843
844                 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
845                 if (ret < 0)
846                         return ret;
847
848                 if (!(video->streaming->cur_format->flags &
849                     UVC_FMT_FLAG_COMPRESSED))
850                         video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
851
852                 rb->count = ret;
853                 ret = 0;
854                 break;
855         }
856
857         case VIDIOC_QUERYBUF:
858         {
859                 struct v4l2_buffer *buf = arg;
860
861                 if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
862                         return -EINVAL;
863
864                 if (!uvc_has_privileges(handle))
865                         return -EBUSY;
866
867                 return uvc_query_buffer(&video->queue, buf);
868         }
869
870         case VIDIOC_QBUF:
871                 if (!uvc_has_privileges(handle))
872                         return -EBUSY;
873
874                 return uvc_queue_buffer(&video->queue, arg);
875
876         case VIDIOC_DQBUF:
877                 if (!uvc_has_privileges(handle))
878                         return -EBUSY;
879
880                 return uvc_dequeue_buffer(&video->queue, arg,
881                         file->f_flags & O_NONBLOCK);
882
883         case VIDIOC_STREAMON:
884         {
885                 int *type = arg;
886
887                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
888                         return -EINVAL;
889
890                 if (!uvc_has_privileges(handle))
891                         return -EBUSY;
892
893                 if ((ret = uvc_video_enable(video, 1)) < 0)
894                         return ret;
895                 break;
896         }
897
898         case VIDIOC_STREAMOFF:
899         {
900                 int *type = arg;
901
902                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
903                         return -EINVAL;
904
905                 if (!uvc_has_privileges(handle))
906                         return -EBUSY;
907
908                 return uvc_video_enable(video, 0);
909         }
910
911         /* Analog video standards make no sense for digital cameras. */
912         case VIDIOC_ENUMSTD:
913         case VIDIOC_QUERYSTD:
914         case VIDIOC_G_STD:
915         case VIDIOC_S_STD:
916
917         case VIDIOC_OVERLAY:
918
919         case VIDIOC_ENUMAUDIO:
920         case VIDIOC_ENUMAUDOUT:
921
922         case VIDIOC_ENUMOUTPUT:
923                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
924                 return -EINVAL;
925
926         /* Dynamic controls. */
927         case UVCIOC_CTRL_ADD:
928         {
929                 struct uvc_xu_control_info *xinfo = arg;
930                 struct uvc_control_info *info;
931
932                 if (!capable(CAP_SYS_ADMIN))
933                         return -EPERM;
934
935                 info = kmalloc(sizeof *info, GFP_KERNEL);
936                 if (info == NULL)
937                         return -ENOMEM;
938
939                 memcpy(info->entity, xinfo->entity, sizeof info->entity);
940                 info->index = xinfo->index;
941                 info->selector = xinfo->selector;
942                 info->size = xinfo->size;
943                 info->flags = xinfo->flags;
944
945                 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
946                                 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
947
948                 ret = uvc_ctrl_add_info(info);
949                 if (ret < 0)
950                         kfree(info);
951                 break;
952         }
953
954         case UVCIOC_CTRL_MAP:
955         {
956                 struct uvc_xu_control_mapping *xmap = arg;
957                 struct uvc_control_mapping *map;
958
959                 if (!capable(CAP_SYS_ADMIN))
960                         return -EPERM;
961
962                 map = kmalloc(sizeof *map, GFP_KERNEL);
963                 if (map == NULL)
964                         return -ENOMEM;
965
966                 map->id = xmap->id;
967                 memcpy(map->name, xmap->name, sizeof map->name);
968                 memcpy(map->entity, xmap->entity, sizeof map->entity);
969                 map->selector = xmap->selector;
970                 map->size = xmap->size;
971                 map->offset = xmap->offset;
972                 map->v4l2_type = xmap->v4l2_type;
973                 map->data_type = xmap->data_type;
974
975                 ret = uvc_ctrl_add_mapping(map);
976                 if (ret < 0)
977                         kfree(map);
978                 break;
979         }
980
981         case UVCIOC_CTRL_GET:
982                 return uvc_xu_ctrl_query(video, arg, 0);
983
984         case UVCIOC_CTRL_SET:
985                 return uvc_xu_ctrl_query(video, arg, 1);
986
987         default:
988                 if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
989                         uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
990                         uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
991                                   cmd);
992                 return ret;
993         }
994
995         return ret;
996 }
997
998 static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
999                      unsigned int cmd, unsigned long arg)
1000 {
1001         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
1002         return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
1003 }
1004
1005 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1006                     size_t count, loff_t *ppos)
1007 {
1008         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1009         return -ENODEV;
1010 }
1011
1012 /*
1013  * VMA operations.
1014  */
1015 static void uvc_vm_open(struct vm_area_struct *vma)
1016 {
1017         struct uvc_buffer *buffer = vma->vm_private_data;
1018         buffer->vma_use_count++;
1019 }
1020
1021 static void uvc_vm_close(struct vm_area_struct *vma)
1022 {
1023         struct uvc_buffer *buffer = vma->vm_private_data;
1024         buffer->vma_use_count--;
1025 }
1026
1027 static struct vm_operations_struct uvc_vm_ops = {
1028         .open           = uvc_vm_open,
1029         .close          = uvc_vm_close,
1030 };
1031
1032 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1033 {
1034         struct video_device *vdev = video_devdata(file);
1035         struct uvc_video_device *video = video_get_drvdata(vdev);
1036         struct uvc_buffer *uninitialized_var(buffer);
1037         struct page *page;
1038         unsigned long addr, start, size;
1039         unsigned int i;
1040         int ret = 0;
1041
1042         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1043
1044         start = vma->vm_start;
1045         size = vma->vm_end - vma->vm_start;
1046
1047         mutex_lock(&video->queue.mutex);
1048
1049         for (i = 0; i < video->queue.count; ++i) {
1050                 buffer = &video->queue.buffer[i];
1051                 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1052                         break;
1053         }
1054
1055         if (i == video->queue.count || size != video->queue.buf_size) {
1056                 ret = -EINVAL;
1057                 goto done;
1058         }
1059
1060         /*
1061          * VM_IO marks the area as being an mmaped region for I/O to a
1062          * device. It also prevents the region from being core dumped.
1063          */
1064         vma->vm_flags |= VM_IO;
1065
1066         addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1067         while (size > 0) {
1068                 page = vmalloc_to_page((void *)addr);
1069                 if ((ret = vm_insert_page(vma, start, page)) < 0)
1070                         goto done;
1071
1072                 start += PAGE_SIZE;
1073                 addr += PAGE_SIZE;
1074                 size -= PAGE_SIZE;
1075         }
1076
1077         vma->vm_ops = &uvc_vm_ops;
1078         vma->vm_private_data = buffer;
1079         uvc_vm_open(vma);
1080
1081 done:
1082         mutex_unlock(&video->queue.mutex);
1083         return ret;
1084 }
1085
1086 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1087 {
1088         struct video_device *vdev = video_devdata(file);
1089         struct uvc_video_device *video = video_get_drvdata(vdev);
1090
1091         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1092
1093         return uvc_queue_poll(&video->queue, file, wait);
1094 }
1095
1096 struct file_operations uvc_fops = {
1097         .owner          = THIS_MODULE,
1098         .open           = uvc_v4l2_open,
1099         .release        = uvc_v4l2_release,
1100         .ioctl          = uvc_v4l2_ioctl,
1101         .compat_ioctl   = v4l_compat_ioctl32,
1102         .llseek         = no_llseek,
1103         .read           = uvc_v4l2_read,
1104         .mmap           = uvc_v4l2_mmap,
1105         .poll           = uvc_v4l2_poll,
1106 };
1107