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atomic: use <linux/atomic.h>
[linux-2.6/next.git] / drivers / media / video / uvc / uvc_v4l2.c
blobdde6533e8e6dce16984c4db5eafb4c8ac25dba41
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
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