atomic: use <linux/atomic.h>
[linux-2.6.git] / 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 <linux/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                 return -EINVAL;
300
301         ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
302         if (ret < 0)
303                 return ret;
304
305         mutex_lock(&stream->mutex);
306
307         if (uvc_queue_allocated(&stream->queue)) {
308                 ret = -EBUSY;
309                 goto done;
310         }
311
312         memcpy(&stream->ctrl, &probe, sizeof probe);
313         stream->cur_format = format;
314         stream->cur_frame = frame;
315
316 done:
317         mutex_unlock(&stream->mutex);
318         return ret;
319 }
320
321 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
322                 struct v4l2_streamparm *parm)
323 {
324         uint32_t numerator, denominator;
325
326         if (parm->type != stream->type)
327                 return -EINVAL;
328
329         mutex_lock(&stream->mutex);
330         numerator = stream->ctrl.dwFrameInterval;
331         mutex_unlock(&stream->mutex);
332
333         denominator = 10000000;
334         uvc_simplify_fraction(&numerator, &denominator, 8, 333);
335
336         memset(parm, 0, sizeof *parm);
337         parm->type = stream->type;
338
339         if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
340                 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
341                 parm->parm.capture.capturemode = 0;
342                 parm->parm.capture.timeperframe.numerator = numerator;
343                 parm->parm.capture.timeperframe.denominator = denominator;
344                 parm->parm.capture.extendedmode = 0;
345                 parm->parm.capture.readbuffers = 0;
346         } else {
347                 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
348                 parm->parm.output.outputmode = 0;
349                 parm->parm.output.timeperframe.numerator = numerator;
350                 parm->parm.output.timeperframe.denominator = denominator;
351         }
352
353         return 0;
354 }
355
356 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
357                 struct v4l2_streamparm *parm)
358 {
359         struct uvc_streaming_control probe;
360         struct v4l2_fract timeperframe;
361         uint32_t interval;
362         int ret;
363
364         if (parm->type != stream->type)
365                 return -EINVAL;
366
367         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
368                 timeperframe = parm->parm.capture.timeperframe;
369         else
370                 timeperframe = parm->parm.output.timeperframe;
371
372         interval = uvc_fraction_to_interval(timeperframe.numerator,
373                 timeperframe.denominator);
374         uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
375                 timeperframe.numerator, timeperframe.denominator, interval);
376
377         mutex_lock(&stream->mutex);
378
379         if (uvc_queue_streaming(&stream->queue)) {
380                 mutex_unlock(&stream->mutex);
381                 return -EBUSY;
382         }
383
384         memcpy(&probe, &stream->ctrl, sizeof probe);
385         probe.dwFrameInterval =
386                 uvc_try_frame_interval(stream->cur_frame, interval);
387
388         /* Probe the device with the new settings. */
389         ret = uvc_probe_video(stream, &probe);
390         if (ret < 0) {
391                 mutex_unlock(&stream->mutex);
392                 return ret;
393         }
394
395         memcpy(&stream->ctrl, &probe, sizeof probe);
396         mutex_unlock(&stream->mutex);
397
398         /* Return the actual frame period. */
399         timeperframe.numerator = probe.dwFrameInterval;
400         timeperframe.denominator = 10000000;
401         uvc_simplify_fraction(&timeperframe.numerator,
402                 &timeperframe.denominator, 8, 333);
403
404         if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
405                 parm->parm.capture.timeperframe = timeperframe;
406         else
407                 parm->parm.output.timeperframe = timeperframe;
408
409         return 0;
410 }
411
412 /* ------------------------------------------------------------------------
413  * Privilege management
414  */
415
416 /*
417  * Privilege management is the multiple-open implementation basis. The current
418  * implementation is completely transparent for the end-user and doesn't
419  * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
420  * Those ioctls enable finer control on the device (by making possible for a
421  * user to request exclusive access to a device), but are not mature yet.
422  * Switching to the V4L2 priority mechanism might be considered in the future
423  * if this situation changes.
424  *
425  * Each open instance of a UVC device can either be in a privileged or
426  * unprivileged state. Only a single instance can be in a privileged state at
427  * a given time. Trying to perform an operation that requires privileges will
428  * automatically acquire the required privileges if possible, or return -EBUSY
429  * otherwise. Privileges are dismissed when closing the instance or when
430  * freeing the video buffers using VIDIOC_REQBUFS.
431  *
432  * Operations that require privileges are:
433  *
434  * - VIDIOC_S_INPUT
435  * - VIDIOC_S_PARM
436  * - VIDIOC_S_FMT
437  * - VIDIOC_REQBUFS
438  */
439 static int uvc_acquire_privileges(struct uvc_fh *handle)
440 {
441         /* Always succeed if the handle is already privileged. */
442         if (handle->state == UVC_HANDLE_ACTIVE)
443                 return 0;
444
445         /* Check if the device already has a privileged handle. */
446         if (atomic_inc_return(&handle->stream->active) != 1) {
447                 atomic_dec(&handle->stream->active);
448                 return -EBUSY;
449         }
450
451         handle->state = UVC_HANDLE_ACTIVE;
452         return 0;
453 }
454
455 static void uvc_dismiss_privileges(struct uvc_fh *handle)
456 {
457         if (handle->state == UVC_HANDLE_ACTIVE)
458                 atomic_dec(&handle->stream->active);
459
460         handle->state = UVC_HANDLE_PASSIVE;
461 }
462
463 static int uvc_has_privileges(struct uvc_fh *handle)
464 {
465         return handle->state == UVC_HANDLE_ACTIVE;
466 }
467
468 /* ------------------------------------------------------------------------
469  * V4L2 file operations
470  */
471
472 static int uvc_v4l2_open(struct file *file)
473 {
474         struct uvc_streaming *stream;
475         struct uvc_fh *handle;
476         int ret = 0;
477
478         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
479         stream = video_drvdata(file);
480
481         if (stream->dev->state & UVC_DEV_DISCONNECTED)
482                 return -ENODEV;
483
484         ret = usb_autopm_get_interface(stream->dev->intf);
485         if (ret < 0)
486                 return ret;
487
488         /* Create the device handle. */
489         handle = kzalloc(sizeof *handle, GFP_KERNEL);
490         if (handle == NULL) {
491                 usb_autopm_put_interface(stream->dev->intf);
492                 return -ENOMEM;
493         }
494
495         if (atomic_inc_return(&stream->dev->users) == 1) {
496                 ret = uvc_status_start(stream->dev);
497                 if (ret < 0) {
498                         usb_autopm_put_interface(stream->dev->intf);
499                         atomic_dec(&stream->dev->users);
500                         kfree(handle);
501                         return ret;
502                 }
503         }
504
505         handle->chain = stream->chain;
506         handle->stream = stream;
507         handle->state = UVC_HANDLE_PASSIVE;
508         file->private_data = handle;
509
510         return 0;
511 }
512
513 static int uvc_v4l2_release(struct file *file)
514 {
515         struct uvc_fh *handle = file->private_data;
516         struct uvc_streaming *stream = handle->stream;
517
518         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
519
520         /* Only free resources if this is a privileged handle. */
521         if (uvc_has_privileges(handle)) {
522                 uvc_video_enable(stream, 0);
523
524                 if (uvc_free_buffers(&stream->queue) < 0)
525                         uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
526                                         "free buffers.\n");
527         }
528
529         /* Release the file handle. */
530         uvc_dismiss_privileges(handle);
531         kfree(handle);
532         file->private_data = NULL;
533
534         if (atomic_dec_return(&stream->dev->users) == 0)
535                 uvc_status_stop(stream->dev);
536
537         usb_autopm_put_interface(stream->dev->intf);
538         return 0;
539 }
540
541 static void uvc_v4l2_ioctl_warn(void)
542 {
543         static int warned;
544
545         if (warned)
546                 return;
547
548         uvc_printk(KERN_INFO, "Deprecated UVCIOC_CTRL_{ADD,MAP_OLD,GET,SET} "
549                    "ioctls will be removed in 2.6.42.\n");
550         uvc_printk(KERN_INFO, "See http://www.ideasonboard.org/uvc/upgrade/ "
551                    "for upgrade instructions.\n");
552         warned = 1;
553 }
554
555 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
556 {
557         struct video_device *vdev = video_devdata(file);
558         struct uvc_fh *handle = file->private_data;
559         struct uvc_video_chain *chain = handle->chain;
560         struct uvc_streaming *stream = handle->stream;
561         long ret = 0;
562
563         switch (cmd) {
564         /* Query capabilities */
565         case VIDIOC_QUERYCAP:
566         {
567                 struct v4l2_capability *cap = arg;
568
569                 memset(cap, 0, sizeof *cap);
570                 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
571                 strlcpy(cap->card, vdev->name, sizeof cap->card);
572                 usb_make_path(stream->dev->udev,
573                               cap->bus_info, sizeof(cap->bus_info));
574                 cap->version = DRIVER_VERSION_NUMBER;
575                 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
576                         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
577                                           | V4L2_CAP_STREAMING;
578                 else
579                         cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
580                                           | V4L2_CAP_STREAMING;
581                 break;
582         }
583
584         /* Get, Set & Query control */
585         case VIDIOC_QUERYCTRL:
586                 return uvc_query_v4l2_ctrl(chain, arg);
587
588         case VIDIOC_G_CTRL:
589         {
590                 struct v4l2_control *ctrl = arg;
591                 struct v4l2_ext_control xctrl;
592
593                 memset(&xctrl, 0, sizeof xctrl);
594                 xctrl.id = ctrl->id;
595
596                 ret = uvc_ctrl_begin(chain);
597                 if (ret < 0)
598                         return ret;
599
600                 ret = uvc_ctrl_get(chain, &xctrl);
601                 uvc_ctrl_rollback(chain);
602                 if (ret >= 0)
603                         ctrl->value = xctrl.value;
604                 break;
605         }
606
607         case VIDIOC_S_CTRL:
608         {
609                 struct v4l2_control *ctrl = arg;
610                 struct v4l2_ext_control xctrl;
611
612                 memset(&xctrl, 0, sizeof xctrl);
613                 xctrl.id = ctrl->id;
614                 xctrl.value = ctrl->value;
615
616                 ret = uvc_ctrl_begin(chain);
617                 if (ret < 0)
618                         return ret;
619
620                 ret = uvc_ctrl_set(chain, &xctrl);
621                 if (ret < 0) {
622                         uvc_ctrl_rollback(chain);
623                         return ret;
624                 }
625                 ret = uvc_ctrl_commit(chain);
626                 if (ret == 0)
627                         ctrl->value = xctrl.value;
628                 break;
629         }
630
631         case VIDIOC_QUERYMENU:
632                 return uvc_query_v4l2_menu(chain, arg);
633
634         case VIDIOC_G_EXT_CTRLS:
635         {
636                 struct v4l2_ext_controls *ctrls = arg;
637                 struct v4l2_ext_control *ctrl = ctrls->controls;
638                 unsigned int i;
639
640                 ret = uvc_ctrl_begin(chain);
641                 if (ret < 0)
642                         return ret;
643
644                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
645                         ret = uvc_ctrl_get(chain, ctrl);
646                         if (ret < 0) {
647                                 uvc_ctrl_rollback(chain);
648                                 ctrls->error_idx = i;
649                                 return ret;
650                         }
651                 }
652                 ctrls->error_idx = 0;
653                 ret = uvc_ctrl_rollback(chain);
654                 break;
655         }
656
657         case VIDIOC_S_EXT_CTRLS:
658         case VIDIOC_TRY_EXT_CTRLS:
659         {
660                 struct v4l2_ext_controls *ctrls = arg;
661                 struct v4l2_ext_control *ctrl = ctrls->controls;
662                 unsigned int i;
663
664                 ret = uvc_ctrl_begin(chain);
665                 if (ret < 0)
666                         return ret;
667
668                 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
669                         ret = uvc_ctrl_set(chain, ctrl);
670                         if (ret < 0) {
671                                 uvc_ctrl_rollback(chain);
672                                 ctrls->error_idx = i;
673                                 return ret;
674                         }
675                 }
676
677                 ctrls->error_idx = 0;
678
679                 if (cmd == VIDIOC_S_EXT_CTRLS)
680                         ret = uvc_ctrl_commit(chain);
681                 else
682                         ret = uvc_ctrl_rollback(chain);
683                 break;
684         }
685
686         /* Get, Set & Enum input */
687         case VIDIOC_ENUMINPUT:
688         {
689                 const struct uvc_entity *selector = chain->selector;
690                 struct v4l2_input *input = arg;
691                 struct uvc_entity *iterm = NULL;
692                 u32 index = input->index;
693                 int pin = 0;
694
695                 if (selector == NULL ||
696                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
697                         if (index != 0)
698                                 return -EINVAL;
699                         list_for_each_entry(iterm, &chain->entities, chain) {
700                                 if (UVC_ENTITY_IS_ITERM(iterm))
701                                         break;
702                         }
703                         pin = iterm->id;
704                 } else if (pin < selector->bNrInPins) {
705                         pin = selector->baSourceID[index];
706                         list_for_each_entry(iterm, &chain->entities, chain) {
707                                 if (!UVC_ENTITY_IS_ITERM(iterm))
708                                         continue;
709                                 if (iterm->id == pin)
710                                         break;
711                         }
712                 }
713
714                 if (iterm == NULL || iterm->id != pin)
715                         return -EINVAL;
716
717                 memset(input, 0, sizeof *input);
718                 input->index = index;
719                 strlcpy(input->name, iterm->name, sizeof input->name);
720                 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
721                         input->type = V4L2_INPUT_TYPE_CAMERA;
722                 break;
723         }
724
725         case VIDIOC_G_INPUT:
726         {
727                 u8 input;
728
729                 if (chain->selector == NULL ||
730                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
731                         *(int *)arg = 0;
732                         break;
733                 }
734
735                 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
736                         chain->selector->id, chain->dev->intfnum,
737                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
738                 if (ret < 0)
739                         return ret;
740
741                 *(int *)arg = input - 1;
742                 break;
743         }
744
745         case VIDIOC_S_INPUT:
746         {
747                 u32 input = *(u32 *)arg + 1;
748
749                 if ((ret = uvc_acquire_privileges(handle)) < 0)
750                         return ret;
751
752                 if (chain->selector == NULL ||
753                     (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
754                         if (input != 1)
755                                 return -EINVAL;
756                         break;
757                 }
758
759                 if (input == 0 || input > chain->selector->bNrInPins)
760                         return -EINVAL;
761
762                 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
763                         chain->selector->id, chain->dev->intfnum,
764                         UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
765         }
766
767         /* Try, Get, Set & Enum format */
768         case VIDIOC_ENUM_FMT:
769         {
770                 struct v4l2_fmtdesc *fmt = arg;
771                 struct uvc_format *format;
772                 enum v4l2_buf_type type = fmt->type;
773                 __u32 index = fmt->index;
774
775                 if (fmt->type != stream->type ||
776                     fmt->index >= stream->nformats)
777                         return -EINVAL;
778
779                 memset(fmt, 0, sizeof(*fmt));
780                 fmt->index = index;
781                 fmt->type = type;
782
783                 format = &stream->format[fmt->index];
784                 fmt->flags = 0;
785                 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
786                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
787                 strlcpy(fmt->description, format->name,
788                         sizeof fmt->description);
789                 fmt->description[sizeof fmt->description - 1] = 0;
790                 fmt->pixelformat = format->fcc;
791                 break;
792         }
793
794         case VIDIOC_TRY_FMT:
795         {
796                 struct uvc_streaming_control probe;
797
798                 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
799         }
800
801         case VIDIOC_S_FMT:
802                 if ((ret = uvc_acquire_privileges(handle)) < 0)
803                         return ret;
804
805                 return uvc_v4l2_set_format(stream, arg);
806
807         case VIDIOC_G_FMT:
808                 return uvc_v4l2_get_format(stream, arg);
809
810         /* Frame size enumeration */
811         case VIDIOC_ENUM_FRAMESIZES:
812         {
813                 struct v4l2_frmsizeenum *fsize = arg;
814                 struct uvc_format *format = NULL;
815                 struct uvc_frame *frame;
816                 int i;
817
818                 /* Look for the given pixel format */
819                 for (i = 0; i < stream->nformats; i++) {
820                         if (stream->format[i].fcc ==
821                                         fsize->pixel_format) {
822                                 format = &stream->format[i];
823                                 break;
824                         }
825                 }
826                 if (format == NULL)
827                         return -EINVAL;
828
829                 if (fsize->index >= format->nframes)
830                         return -EINVAL;
831
832                 frame = &format->frame[fsize->index];
833                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
834                 fsize->discrete.width = frame->wWidth;
835                 fsize->discrete.height = frame->wHeight;
836                 break;
837         }
838
839         /* Frame interval enumeration */
840         case VIDIOC_ENUM_FRAMEINTERVALS:
841         {
842                 struct v4l2_frmivalenum *fival = arg;
843                 struct uvc_format *format = NULL;
844                 struct uvc_frame *frame = NULL;
845                 int i;
846
847                 /* Look for the given pixel format and frame size */
848                 for (i = 0; i < stream->nformats; i++) {
849                         if (stream->format[i].fcc ==
850                                         fival->pixel_format) {
851                                 format = &stream->format[i];
852                                 break;
853                         }
854                 }
855                 if (format == NULL)
856                         return -EINVAL;
857
858                 for (i = 0; i < format->nframes; i++) {
859                         if (format->frame[i].wWidth == fival->width &&
860                             format->frame[i].wHeight == fival->height) {
861                                 frame = &format->frame[i];
862                                 break;
863                         }
864                 }
865                 if (frame == NULL)
866                         return -EINVAL;
867
868                 if (frame->bFrameIntervalType) {
869                         if (fival->index >= frame->bFrameIntervalType)
870                                 return -EINVAL;
871
872                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
873                         fival->discrete.numerator =
874                                 frame->dwFrameInterval[fival->index];
875                         fival->discrete.denominator = 10000000;
876                         uvc_simplify_fraction(&fival->discrete.numerator,
877                                 &fival->discrete.denominator, 8, 333);
878                 } else {
879                         fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
880                         fival->stepwise.min.numerator =
881                                 frame->dwFrameInterval[0];
882                         fival->stepwise.min.denominator = 10000000;
883                         fival->stepwise.max.numerator =
884                                 frame->dwFrameInterval[1];
885                         fival->stepwise.max.denominator = 10000000;
886                         fival->stepwise.step.numerator =
887                                 frame->dwFrameInterval[2];
888                         fival->stepwise.step.denominator = 10000000;
889                         uvc_simplify_fraction(&fival->stepwise.min.numerator,
890                                 &fival->stepwise.min.denominator, 8, 333);
891                         uvc_simplify_fraction(&fival->stepwise.max.numerator,
892                                 &fival->stepwise.max.denominator, 8, 333);
893                         uvc_simplify_fraction(&fival->stepwise.step.numerator,
894                                 &fival->stepwise.step.denominator, 8, 333);
895                 }
896                 break;
897         }
898
899         /* Get & Set streaming parameters */
900         case VIDIOC_G_PARM:
901                 return uvc_v4l2_get_streamparm(stream, arg);
902
903         case VIDIOC_S_PARM:
904                 if ((ret = uvc_acquire_privileges(handle)) < 0)
905                         return ret;
906
907                 return uvc_v4l2_set_streamparm(stream, arg);
908
909         /* Cropping and scaling */
910         case VIDIOC_CROPCAP:
911         {
912                 struct v4l2_cropcap *ccap = arg;
913
914                 if (ccap->type != stream->type)
915                         return -EINVAL;
916
917                 ccap->bounds.left = 0;
918                 ccap->bounds.top = 0;
919
920                 mutex_lock(&stream->mutex);
921                 ccap->bounds.width = stream->cur_frame->wWidth;
922                 ccap->bounds.height = stream->cur_frame->wHeight;
923                 mutex_unlock(&stream->mutex);
924
925                 ccap->defrect = ccap->bounds;
926
927                 ccap->pixelaspect.numerator = 1;
928                 ccap->pixelaspect.denominator = 1;
929                 break;
930         }
931
932         case VIDIOC_G_CROP:
933         case VIDIOC_S_CROP:
934                 return -EINVAL;
935
936         /* Buffers & streaming */
937         case VIDIOC_REQBUFS:
938         {
939                 struct v4l2_requestbuffers *rb = arg;
940
941                 if (rb->type != stream->type ||
942                     rb->memory != V4L2_MEMORY_MMAP)
943                         return -EINVAL;
944
945                 if ((ret = uvc_acquire_privileges(handle)) < 0)
946                         return ret;
947
948                 mutex_lock(&stream->mutex);
949                 ret = uvc_alloc_buffers(&stream->queue, rb->count,
950                                         stream->ctrl.dwMaxVideoFrameSize);
951                 mutex_unlock(&stream->mutex);
952                 if (ret < 0)
953                         return ret;
954
955                 if (ret == 0)
956                         uvc_dismiss_privileges(handle);
957
958                 rb->count = ret;
959                 ret = 0;
960                 break;
961         }
962
963         case VIDIOC_QUERYBUF:
964         {
965                 struct v4l2_buffer *buf = arg;
966
967                 if (buf->type != stream->type)
968                         return -EINVAL;
969
970                 if (!uvc_has_privileges(handle))
971                         return -EBUSY;
972
973                 return uvc_query_buffer(&stream->queue, buf);
974         }
975
976         case VIDIOC_QBUF:
977                 if (!uvc_has_privileges(handle))
978                         return -EBUSY;
979
980                 return uvc_queue_buffer(&stream->queue, arg);
981
982         case VIDIOC_DQBUF:
983                 if (!uvc_has_privileges(handle))
984                         return -EBUSY;
985
986                 return uvc_dequeue_buffer(&stream->queue, arg,
987                         file->f_flags & O_NONBLOCK);
988
989         case VIDIOC_STREAMON:
990         {
991                 int *type = arg;
992
993                 if (*type != stream->type)
994                         return -EINVAL;
995
996                 if (!uvc_has_privileges(handle))
997                         return -EBUSY;
998
999                 mutex_lock(&stream->mutex);
1000                 ret = uvc_video_enable(stream, 1);
1001                 mutex_unlock(&stream->mutex);
1002                 if (ret < 0)
1003                         return ret;
1004                 break;
1005         }
1006
1007         case VIDIOC_STREAMOFF:
1008         {
1009                 int *type = arg;
1010
1011                 if (*type != stream->type)
1012                         return -EINVAL;
1013
1014                 if (!uvc_has_privileges(handle))
1015                         return -EBUSY;
1016
1017                 return uvc_video_enable(stream, 0);
1018         }
1019
1020         /* Analog video standards make no sense for digital cameras. */
1021         case VIDIOC_ENUMSTD:
1022         case VIDIOC_QUERYSTD:
1023         case VIDIOC_G_STD:
1024         case VIDIOC_S_STD:
1025
1026         case VIDIOC_OVERLAY:
1027
1028         case VIDIOC_ENUMAUDIO:
1029         case VIDIOC_ENUMAUDOUT:
1030
1031         case VIDIOC_ENUMOUTPUT:
1032                 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1033                 return -EINVAL;
1034
1035         /* Dynamic controls. UVCIOC_CTRL_ADD, UVCIOC_CTRL_MAP_OLD,
1036          * UVCIOC_CTRL_GET and UVCIOC_CTRL_SET are deprecated and scheduled for
1037          * removal in 2.6.42.
1038          */
1039         case __UVCIOC_CTRL_ADD:
1040                 uvc_v4l2_ioctl_warn();
1041                 return -EEXIST;
1042
1043         case __UVCIOC_CTRL_MAP_OLD:
1044                 uvc_v4l2_ioctl_warn();
1045         case __UVCIOC_CTRL_MAP:
1046         case UVCIOC_CTRL_MAP:
1047                 return uvc_ioctl_ctrl_map(chain, arg,
1048                                           cmd == __UVCIOC_CTRL_MAP_OLD);
1049
1050         case __UVCIOC_CTRL_GET:
1051         case __UVCIOC_CTRL_SET:
1052         {
1053                 struct uvc_xu_control *xctrl = arg;
1054                 struct uvc_xu_control_query xqry = {
1055                         .unit           = xctrl->unit,
1056                         .selector       = xctrl->selector,
1057                         .query          = cmd == __UVCIOC_CTRL_GET
1058                                         ? UVC_GET_CUR : UVC_SET_CUR,
1059                         .size           = xctrl->size,
1060                         .data           = xctrl->data,
1061                 };
1062
1063                 uvc_v4l2_ioctl_warn();
1064                 return uvc_xu_ctrl_query(chain, &xqry);
1065         }
1066
1067         case UVCIOC_CTRL_QUERY:
1068                 return uvc_xu_ctrl_query(chain, arg);
1069
1070         default:
1071                 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1072                 return -EINVAL;
1073         }
1074
1075         return ret;
1076 }
1077
1078 static long uvc_v4l2_ioctl(struct file *file,
1079                      unsigned int cmd, unsigned long arg)
1080 {
1081         if (uvc_trace_param & UVC_TRACE_IOCTL) {
1082                 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1083                 v4l_printk_ioctl(cmd);
1084                 printk(")\n");
1085         }
1086
1087         return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1088 }
1089
1090 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1091                     size_t count, loff_t *ppos)
1092 {
1093         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1094         return -EINVAL;
1095 }
1096
1097 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1098 {
1099         struct uvc_fh *handle = file->private_data;
1100         struct uvc_streaming *stream = handle->stream;
1101
1102         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1103
1104         return uvc_queue_mmap(&stream->queue, vma);
1105 }
1106
1107 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1108 {
1109         struct uvc_fh *handle = file->private_data;
1110         struct uvc_streaming *stream = handle->stream;
1111
1112         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1113
1114         return uvc_queue_poll(&stream->queue, file, wait);
1115 }
1116
1117 #ifndef CONFIG_MMU
1118 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1119                 unsigned long addr, unsigned long len, unsigned long pgoff,
1120                 unsigned long flags)
1121 {
1122         struct uvc_fh *handle = file->private_data;
1123         struct uvc_streaming *stream = handle->stream;
1124
1125         uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1126
1127         return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1128 }
1129 #endif
1130
1131 const struct v4l2_file_operations uvc_fops = {
1132         .owner          = THIS_MODULE,
1133         .open           = uvc_v4l2_open,
1134         .release        = uvc_v4l2_release,
1135         .unlocked_ioctl = uvc_v4l2_ioctl,
1136         .read           = uvc_v4l2_read,
1137         .mmap           = uvc_v4l2_mmap,
1138         .poll           = uvc_v4l2_poll,
1139 #ifndef CONFIG_MMU
1140         .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1141 #endif
1142 };
1143