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Partly revert "[media] uvcvideo: Set error_idx properly for extended controls API...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / usb / uvc / uvc_v4l2.c
blobf2ee8c6b0d8dbb8ceb5d7ebad4bcfd85d878b6dd
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/compat.h>
15 #include <linux/kernel.h>
16 #include <linux/version.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/usb.h>
21 #include <linux/videodev2.h>
22 #include <linux/vmalloc.h>
23 #include <linux/mm.h>
24 #include <linux/wait.h>
25 #include <linux/atomic.h>
26
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-ctrls.h>
29 #include <media/v4l2-event.h>
30 #include <media/v4l2-ioctl.h>
31
32 #include "uvcvideo.h"
33
34 /* ------------------------------------------------------------------------
35 * UVC ioctls
36 */
37 static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
38 struct uvc_xu_control_mapping *xmap)
39 {
40 struct uvc_control_mapping *map;
41 unsigned int size;
42 int ret;
43
44 map = kzalloc(sizeof *map, GFP_KERNEL);
45 if (map == NULL)
46 return -ENOMEM;
47
48 map->id = xmap->id;
49 memcpy(map->name, xmap->name, sizeof map->name);
50 memcpy(map->entity, xmap->entity, sizeof map->entity);
51 map->selector = xmap->selector;
52 map->size = xmap->size;
53 map->offset = xmap->offset;
54 map->v4l2_type = xmap->v4l2_type;
55 map->data_type = xmap->data_type;
56
57 switch (xmap->v4l2_type) {
58 case V4L2_CTRL_TYPE_INTEGER:
59 case V4L2_CTRL_TYPE_BOOLEAN:
60 case V4L2_CTRL_TYPE_BUTTON:
61 break;
62
63 case V4L2_CTRL_TYPE_MENU:
64 /* Prevent excessive memory consumption, as well as integer
65 * overflows.
66 */
67 if (xmap->menu_count == 0 ||
68 xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
69 ret = -EINVAL;
70 goto done;
71 }
72
73 size = xmap->menu_count * sizeof(*map->menu_info);
74 map->menu_info = kmalloc(size, GFP_KERNEL);
75 if (map->menu_info == NULL) {
76 ret = -ENOMEM;
77 goto done;
78 }
79
80 if (copy_from_user(map->menu_info, xmap->menu_info, size)) {
81 ret = -EFAULT;
82 goto done;
83 }
84
85 map->menu_count = xmap->menu_count;
86 break;
87
88 default:
89 uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
90 "%u.\n", xmap->v4l2_type);
91 ret = -ENOTTY;
92 goto done;
93 }
94
95 ret = uvc_ctrl_add_mapping(chain, map);
96
97 done:
98 kfree(map->menu_info);
99 kfree(map);
100
101 return ret;
102 }
103
104 /* ------------------------------------------------------------------------
105 * V4L2 interface
106 */
107
108 /*
109 * Find the frame interval closest to the requested frame interval for the
110 * given frame format and size. This should be done by the device as part of
111 * the Video Probe and Commit negotiation, but some hardware don't implement
112 * that feature.
113 */
114 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
115 {
116 unsigned int i;
117
118 if (frame->bFrameIntervalType) {
119 __u32 best = -1, dist;
120
121 for (i = 0; i < frame->bFrameIntervalType; ++i) {
122 dist = interval > frame->dwFrameInterval[i]
123 ? interval - frame->dwFrameInterval[i]
124 : frame->dwFrameInterval[i] - interval;
125
126 if (dist > best)
127 break;
128
129 best = dist;
130 }
131
132 interval = frame->dwFrameInterval[i-1];
133 } else {
134 const __u32 min = frame->dwFrameInterval[0];
135 const __u32 max = frame->dwFrameInterval[1];
136 const __u32 step = frame->dwFrameInterval[2];
137
138 interval = min + (interval - min + step/2) / step * step;
139 if (interval > max)
140 interval = max;
141 }
142
143 return interval;
144 }
145
146 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
147 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
148 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
149 {
150 struct uvc_format *format = NULL;
151 struct uvc_frame *frame = NULL;
152 __u16 rw, rh;
153 unsigned int d, maxd;
154 unsigned int i;
155 __u32 interval;
156 int ret = 0;
157 __u8 *fcc;
158
159 if (fmt->type != stream->type)
160 return -EINVAL;
161
162 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
163 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
164 fmt->fmt.pix.pixelformat,
165 fcc[0], fcc[1], fcc[2], fcc[3],
166 fmt->fmt.pix.width, fmt->fmt.pix.height);
167
168 /* Check if the hardware supports the requested format, use the default
169 * format otherwise.
170 */
171 for (i = 0; i < stream->nformats; ++i) {
172 format = &stream->format[i];
173 if (format->fcc == fmt->fmt.pix.pixelformat)
174 break;
175 }
176
177 if (i == stream->nformats) {
178 format = stream->def_format;
179 fmt->fmt.pix.pixelformat = format->fcc;
180 }
181
182 /* Find the closest image size. The distance between image sizes is
183 * the size in pixels of the non-overlapping regions between the
184 * requested size and the frame-specified size.
185 */
186 rw = fmt->fmt.pix.width;
187 rh = fmt->fmt.pix.height;
188 maxd = (unsigned int)-1;
189
190 for (i = 0; i < format->nframes; ++i) {
191 __u16 w = format->frame[i].wWidth;
192 __u16 h = format->frame[i].wHeight;
193
194 d = min(w, rw) * min(h, rh);
195 d = w*h + rw*rh - 2*d;
196 if (d < maxd) {
197 maxd = d;
198 frame = &format->frame[i];
199 }
200
201 if (maxd == 0)
202 break;
203 }
204
205 if (frame == NULL) {
206 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
207 fmt->fmt.pix.width, fmt->fmt.pix.height);
208 return -EINVAL;
209 }
210
211 /* Use the default frame interval. */
212 interval = frame->dwDefaultFrameInterval;
213 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
214 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
215 (100000000/interval)%10);
216
217 /* Set the format index, frame index and frame interval. */
218 memset(probe, 0, sizeof *probe);
219 probe->bmHint = 1; /* dwFrameInterval */
220 probe->bFormatIndex = format->index;
221 probe->bFrameIndex = frame->bFrameIndex;
222 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
223 /* Some webcams stall the probe control set request when the
224 * dwMaxVideoFrameSize field is set to zero. The UVC specification
225 * clearly states that the field is read-only from the host, so this
226 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
227 * the webcam to work around the problem.
228 *
229 * The workaround could probably be enabled for all webcams, so the
230 * quirk can be removed if needed. It's currently useful to detect
231 * webcam bugs and fix them before they hit the market (providing
232 * developers test their webcams with the Linux driver as well as with
233 * the Windows driver).
234 */
235 mutex_lock(&stream->mutex);
236 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
237 probe->dwMaxVideoFrameSize =
238 stream->ctrl.dwMaxVideoFrameSize;
239
240 /* Probe the device. */
241 ret = uvc_probe_video(stream, probe);
242 mutex_unlock(&stream->mutex);
243 if (ret < 0)
244 goto done;
245
246 fmt->fmt.pix.width = frame->wWidth;
247 fmt->fmt.pix.height = frame->wHeight;
248 fmt->fmt.pix.field = V4L2_FIELD_NONE;
249 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
250 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
251 fmt->fmt.pix.colorspace = format->colorspace;
252 fmt->fmt.pix.priv = 0;
253
254 if (uvc_format != NULL)
255 *uvc_format = format;
256 if (uvc_frame != NULL)
257 *uvc_frame = frame;
258
259 done:
260 return ret;
261 }
262
263 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
264 struct v4l2_format *fmt)
265 {
266 struct uvc_format *format;
267 struct uvc_frame *frame;
268 int ret = 0;
269
270 if (fmt->type != stream->type)
271 return -EINVAL;
272
273 mutex_lock(&stream->mutex);
274 format = stream->cur_format;
275 frame = stream->cur_frame;
276
277 if (format == NULL || frame == NULL) {
278 ret = -EINVAL;
279 goto done;
280 }
281
282 fmt->fmt.pix.pixelformat = format->fcc;
283 fmt->fmt.pix.width = frame->wWidth;
284 fmt->fmt.pix.height = frame->wHeight;
285 fmt->fmt.pix.field = V4L2_FIELD_NONE;
286 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
287 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
288 fmt->fmt.pix.colorspace = format->colorspace;
289 fmt->fmt.pix.priv = 0;
290
291 done:
292 mutex_unlock(&stream->mutex);
293 return ret;
294 }
295
296 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
297 struct v4l2_format *fmt)
298 {
299 struct uvc_streaming_control probe;
300 struct uvc_format *format;
301 struct uvc_frame *frame;
302 int ret;
303
304 if (fmt->type != stream->type)
305 return -EINVAL;
306
307 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
308 if (ret < 0)
309 return ret;
310
311 mutex_lock(&stream->mutex);
312
313 if (uvc_queue_allocated(&stream->queue)) {
314 ret = -EBUSY;
315 goto done;
316 }
317
318 memcpy(&stream->ctrl, &probe, sizeof probe);
319 stream->cur_format = format;
320 stream->cur_frame = frame;
321
322 done:
323 mutex_unlock(&stream->mutex);
324 return ret;
325 }
326
327 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
328 struct v4l2_streamparm *parm)
329 {
330 uint32_t numerator, denominator;
331
332 if (parm->type != stream->type)
333 return -EINVAL;
334
335 mutex_lock(&stream->mutex);
336 numerator = stream->ctrl.dwFrameInterval;
337 mutex_unlock(&stream->mutex);
338
339 denominator = 10000000;
340 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
341
342 memset(parm, 0, sizeof *parm);
343 parm->type = stream->type;
344
345 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
346 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
347 parm->parm.capture.capturemode = 0;
348 parm->parm.capture.timeperframe.numerator = numerator;
349 parm->parm.capture.timeperframe.denominator = denominator;
350 parm->parm.capture.extendedmode = 0;
351 parm->parm.capture.readbuffers = 0;
352 } else {
353 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
354 parm->parm.output.outputmode = 0;
355 parm->parm.output.timeperframe.numerator = numerator;
356 parm->parm.output.timeperframe.denominator = denominator;
357 }
358
359 return 0;
360 }
361
362 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
363 struct v4l2_streamparm *parm)
364 {
365 struct uvc_streaming_control probe;
366 struct v4l2_fract timeperframe;
367 uint32_t interval;
368 int ret;
369
370 if (parm->type != stream->type)
371 return -EINVAL;
372
373 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
374 timeperframe = parm->parm.capture.timeperframe;
375 else
376 timeperframe = parm->parm.output.timeperframe;
377
378 interval = uvc_fraction_to_interval(timeperframe.numerator,
379 timeperframe.denominator);
380 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
381 timeperframe.numerator, timeperframe.denominator, interval);
382
383 mutex_lock(&stream->mutex);
384
385 if (uvc_queue_streaming(&stream->queue)) {
386 mutex_unlock(&stream->mutex);
387 return -EBUSY;
388 }
389
390 memcpy(&probe, &stream->ctrl, sizeof probe);
391 probe.dwFrameInterval =
392 uvc_try_frame_interval(stream->cur_frame, interval);
393
394 /* Probe the device with the new settings. */
395 ret = uvc_probe_video(stream, &probe);
396 if (ret < 0) {
397 mutex_unlock(&stream->mutex);
398 return ret;
399 }
400
401 memcpy(&stream->ctrl, &probe, sizeof probe);
402 mutex_unlock(&stream->mutex);
403
404 /* Return the actual frame period. */
405 timeperframe.numerator = probe.dwFrameInterval;
406 timeperframe.denominator = 10000000;
407 uvc_simplify_fraction(&timeperframe.numerator,
408 &timeperframe.denominator, 8, 333);
409
410 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
411 parm->parm.capture.timeperframe = timeperframe;
412 else
413 parm->parm.output.timeperframe = timeperframe;
414
415 return 0;
416 }
417
418 /* ------------------------------------------------------------------------
419 * Privilege management
420 */
421
422 /*
423 * Privilege management is the multiple-open implementation basis. The current
424 * implementation is completely transparent for the end-user and doesn't
425 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
426 * Those ioctls enable finer control on the device (by making possible for a
427 * user to request exclusive access to a device), but are not mature yet.
428 * Switching to the V4L2 priority mechanism might be considered in the future
429 * if this situation changes.
430 *
431 * Each open instance of a UVC device can either be in a privileged or
432 * unprivileged state. Only a single instance can be in a privileged state at
433 * a given time. Trying to perform an operation that requires privileges will
434 * automatically acquire the required privileges if possible, or return -EBUSY
435 * otherwise. Privileges are dismissed when closing the instance or when
436 * freeing the video buffers using VIDIOC_REQBUFS.
437 *
438 * Operations that require privileges are:
439 *
440 * - VIDIOC_S_INPUT
441 * - VIDIOC_S_PARM
442 * - VIDIOC_S_FMT
443 * - VIDIOC_REQBUFS
444 */
445 static int uvc_acquire_privileges(struct uvc_fh *handle)
446 {
447 /* Always succeed if the handle is already privileged. */
448 if (handle->state == UVC_HANDLE_ACTIVE)
449 return 0;
450
451 /* Check if the device already has a privileged handle. */
452 if (atomic_inc_return(&handle->stream->active) != 1) {
453 atomic_dec(&handle->stream->active);
454 return -EBUSY;
455 }
456
457 handle->state = UVC_HANDLE_ACTIVE;
458 return 0;
459 }
460
461 static void uvc_dismiss_privileges(struct uvc_fh *handle)
462 {
463 if (handle->state == UVC_HANDLE_ACTIVE)
464 atomic_dec(&handle->stream->active);
465
466 handle->state = UVC_HANDLE_PASSIVE;
467 }
468
469 static int uvc_has_privileges(struct uvc_fh *handle)
470 {
471 return handle->state == UVC_HANDLE_ACTIVE;
472 }
473
474 /* ------------------------------------------------------------------------
475 * V4L2 file operations
476 */
477
478 static int uvc_v4l2_open(struct file *file)
479 {
480 struct uvc_streaming *stream;
481 struct uvc_fh *handle;
482 int ret = 0;
483
484 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
485 stream = video_drvdata(file);
486
487 if (stream->dev->state & UVC_DEV_DISCONNECTED)
488 return -ENODEV;
489
490 ret = usb_autopm_get_interface(stream->dev->intf);
491 if (ret < 0)
492 return ret;
493
494 /* Create the device handle. */
495 handle = kzalloc(sizeof *handle, GFP_KERNEL);
496 if (handle == NULL) {
497 usb_autopm_put_interface(stream->dev->intf);
498 return -ENOMEM;
499 }
500
501 if (atomic_inc_return(&stream->dev->users) == 1) {
502 ret = uvc_status_start(stream->dev);
503 if (ret < 0) {
504 usb_autopm_put_interface(stream->dev->intf);
505 atomic_dec(&stream->dev->users);
506 kfree(handle);
507 return ret;
508 }
509 }
510
511 v4l2_fh_init(&handle->vfh, stream->vdev);
512 v4l2_fh_add(&handle->vfh);
513 handle->chain = stream->chain;
514 handle->stream = stream;
515 handle->state = UVC_HANDLE_PASSIVE;
516 file->private_data = handle;
517
518 return 0;
519 }
520
521 static int uvc_v4l2_release(struct file *file)
522 {
523 struct uvc_fh *handle = file->private_data;
524 struct uvc_streaming *stream = handle->stream;
525
526 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
527
528 /* Only free resources if this is a privileged handle. */
529 if (uvc_has_privileges(handle)) {
530 uvc_video_enable(stream, 0);
531 uvc_free_buffers(&stream->queue);
532 }
533
534 /* Release the file handle. */
535 uvc_dismiss_privileges(handle);
536 v4l2_fh_del(&handle->vfh);
537 v4l2_fh_exit(&handle->vfh);
538 kfree(handle);
539 file->private_data = NULL;
540
541 if (atomic_dec_return(&stream->dev->users) == 0)
542 uvc_status_stop(stream->dev);
543
544 usb_autopm_put_interface(stream->dev->intf);
545 return 0;
546 }
547
548 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
549 {
550 struct video_device *vdev = video_devdata(file);
551 struct uvc_fh *handle = file->private_data;
552 struct uvc_video_chain *chain = handle->chain;
553 struct uvc_streaming *stream = handle->stream;
554 long ret = 0;
555
556 switch (cmd) {
557 /* Query capabilities */
558 case VIDIOC_QUERYCAP:
559 {
560 struct v4l2_capability *cap = arg;
561
562 memset(cap, 0, sizeof *cap);
563 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
564 strlcpy(cap->card, vdev->name, sizeof cap->card);
565 usb_make_path(stream->dev->udev,
566 cap->bus_info, sizeof(cap->bus_info));
567 cap->version = LINUX_VERSION_CODE;
568 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
569 | chain->caps;
570 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
571 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
572 | V4L2_CAP_STREAMING;
573 else
574 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
575 | V4L2_CAP_STREAMING;
576 break;
577 }
578
579 /* Priority */
580 case VIDIOC_G_PRIORITY:
581 *(u32 *)arg = v4l2_prio_max(vdev->prio);
582 break;
583
584 case VIDIOC_S_PRIORITY:
585 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
586 if (ret < 0)
587 return ret;
588
589 return v4l2_prio_change(vdev->prio, &handle->vfh.prio,
590 *(u32 *)arg);
591
592 /* Get, Set & Query control */
593 case VIDIOC_QUERYCTRL:
594 return uvc_query_v4l2_ctrl(chain, arg);
595
596 case VIDIOC_G_CTRL:
597 {
598 struct v4l2_control *ctrl = arg;
599 struct v4l2_ext_control xctrl;
600
601 memset(&xctrl, 0, sizeof xctrl);
602 xctrl.id = ctrl->id;
603
604 ret = uvc_ctrl_begin(chain);
605 if (ret < 0)
606 return ret;
607
608 ret = uvc_ctrl_get(chain, &xctrl);
609 uvc_ctrl_rollback(handle);
610 if (ret >= 0)
611 ctrl->value = xctrl.value;
612 break;
613 }
614
615 case VIDIOC_S_CTRL:
616 {
617 struct v4l2_control *ctrl = arg;
618 struct v4l2_ext_control xctrl;
619
620 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
621 if (ret < 0)
622 return ret;
623
624 memset(&xctrl, 0, sizeof xctrl);
625 xctrl.id = ctrl->id;
626 xctrl.value = ctrl->value;
627
628 ret = uvc_ctrl_begin(chain);
629 if (ret < 0)
630 return ret;
631
632 ret = uvc_ctrl_set(chain, &xctrl);
633 if (ret < 0) {
634 uvc_ctrl_rollback(handle);
635 return ret;
636 }
637 ret = uvc_ctrl_commit(handle, &xctrl, 1);
638 if (ret == 0)
639 ctrl->value = xctrl.value;
640 break;
641 }
642
643 case VIDIOC_QUERYMENU:
644 return uvc_query_v4l2_menu(chain, arg);
645
646 case VIDIOC_G_EXT_CTRLS:
647 {
648 struct v4l2_ext_controls *ctrls = arg;
649 struct v4l2_ext_control *ctrl = ctrls->controls;
650 unsigned int i;
651
652 ret = uvc_ctrl_begin(chain);
653 if (ret < 0)
654 return ret;
655
656 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
657 ret = uvc_ctrl_get(chain, ctrl);
658 if (ret < 0) {
659 uvc_ctrl_rollback(handle);
660 ctrls->error_idx = ret == -ENOENT
661 ? ctrls->count : i;
662 return ret;
663 }
664 }
665 ctrls->error_idx = 0;
666 ret = uvc_ctrl_rollback(handle);
667 break;
668 }
669
670 case VIDIOC_S_EXT_CTRLS:
671 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
672 if (ret < 0)
673 return ret;
674 /* Fall through */
675 case VIDIOC_TRY_EXT_CTRLS:
676 {
677 struct v4l2_ext_controls *ctrls = arg;
678 struct v4l2_ext_control *ctrl = ctrls->controls;
679 unsigned int i;
680
681 ret = uvc_ctrl_begin(chain);
682 if (ret < 0)
683 return ret;
684
685 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
686 ret = uvc_ctrl_set(chain, ctrl);
687 if (ret < 0) {
688 uvc_ctrl_rollback(handle);
689 ctrls->error_idx = (ret == -ENOENT &&
690 cmd == VIDIOC_S_EXT_CTRLS)
691 ? ctrls->count : i;
692 return ret;
693 }
694 }
695
696 ctrls->error_idx = 0;
697
698 if (cmd == VIDIOC_S_EXT_CTRLS)
699 ret = uvc_ctrl_commit(handle,
700 ctrls->controls, ctrls->count);
701 else
702 ret = uvc_ctrl_rollback(handle);
703 break;
704 }
705
706 /* Get, Set & Enum input */
707 case VIDIOC_ENUMINPUT:
708 {
709 const struct uvc_entity *selector = chain->selector;
710 struct v4l2_input *input = arg;
711 struct uvc_entity *iterm = NULL;
712 u32 index = input->index;
713 int pin = 0;
714
715 if (selector == NULL ||
716 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
717 if (index != 0)
718 return -EINVAL;
719 list_for_each_entry(iterm, &chain->entities, chain) {
720 if (UVC_ENTITY_IS_ITERM(iterm))
721 break;
722 }
723 pin = iterm->id;
724 } else if (index < selector->bNrInPins) {
725 pin = selector->baSourceID[index];
726 list_for_each_entry(iterm, &chain->entities, chain) {
727 if (!UVC_ENTITY_IS_ITERM(iterm))
728 continue;
729 if (iterm->id == pin)
730 break;
731 }
732 }
733
734 if (iterm == NULL || iterm->id != pin)
735 return -EINVAL;
736
737 memset(input, 0, sizeof *input);
738 input->index = index;
739 strlcpy(input->name, iterm->name, sizeof input->name);
740 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
741 input->type = V4L2_INPUT_TYPE_CAMERA;
742 break;
743 }
744
745 case VIDIOC_G_INPUT:
746 {
747 u8 input;
748
749 if (chain->selector == NULL ||
750 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
751 *(int *)arg = 0;
752 break;
753 }
754
755 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
756 chain->selector->id, chain->dev->intfnum,
757 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
758 if (ret < 0)
759 return ret;
760
761 *(int *)arg = input - 1;
762 break;
763 }
764
765 case VIDIOC_S_INPUT:
766 {
767 u32 input = *(u32 *)arg + 1;
768
769 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
770 if (ret < 0)
771 return ret;
772
773 if ((ret = uvc_acquire_privileges(handle)) < 0)
774 return ret;
775
776 if (chain->selector == NULL ||
777 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
778 if (input != 1)
779 return -EINVAL;
780 break;
781 }
782
783 if (input == 0 || input > chain->selector->bNrInPins)
784 return -EINVAL;
785
786 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
787 chain->selector->id, chain->dev->intfnum,
788 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
789 }
790
791 /* Try, Get, Set & Enum format */
792 case VIDIOC_ENUM_FMT:
793 {
794 struct v4l2_fmtdesc *fmt = arg;
795 struct uvc_format *format;
796 enum v4l2_buf_type type = fmt->type;
797 __u32 index = fmt->index;
798
799 if (fmt->type != stream->type ||
800 fmt->index >= stream->nformats)
801 return -EINVAL;
802
803 memset(fmt, 0, sizeof(*fmt));
804 fmt->index = index;
805 fmt->type = type;
806
807 format = &stream->format[fmt->index];
808 fmt->flags = 0;
809 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
810 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
811 strlcpy(fmt->description, format->name,
812 sizeof fmt->description);
813 fmt->description[sizeof fmt->description - 1] = 0;
814 fmt->pixelformat = format->fcc;
815 break;
816 }
817
818 case VIDIOC_TRY_FMT:
819 {
820 struct uvc_streaming_control probe;
821
822 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
823 }
824
825 case VIDIOC_S_FMT:
826 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
827 if (ret < 0)
828 return ret;
829
830 if ((ret = uvc_acquire_privileges(handle)) < 0)
831 return ret;
832
833 return uvc_v4l2_set_format(stream, arg);
834
835 case VIDIOC_G_FMT:
836 return uvc_v4l2_get_format(stream, arg);
837
838 /* Frame size enumeration */
839 case VIDIOC_ENUM_FRAMESIZES:
840 {
841 struct v4l2_frmsizeenum *fsize = arg;
842 struct uvc_format *format = NULL;
843 struct uvc_frame *frame;
844 int i;
845
846 /* Look for the given pixel format */
847 for (i = 0; i < stream->nformats; i++) {
848 if (stream->format[i].fcc ==
849 fsize->pixel_format) {
850 format = &stream->format[i];
851 break;
852 }
853 }
854 if (format == NULL)
855 return -EINVAL;
856
857 if (fsize->index >= format->nframes)
858 return -EINVAL;
859
860 frame = &format->frame[fsize->index];
861 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
862 fsize->discrete.width = frame->wWidth;
863 fsize->discrete.height = frame->wHeight;
864 break;
865 }
866
867 /* Frame interval enumeration */
868 case VIDIOC_ENUM_FRAMEINTERVALS:
869 {
870 struct v4l2_frmivalenum *fival = arg;
871 struct uvc_format *format = NULL;
872 struct uvc_frame *frame = NULL;
873 int i;
874
875 /* Look for the given pixel format and frame size */
876 for (i = 0; i < stream->nformats; i++) {
877 if (stream->format[i].fcc ==
878 fival->pixel_format) {
879 format = &stream->format[i];
880 break;
881 }
882 }
883 if (format == NULL)
884 return -EINVAL;
885
886 for (i = 0; i < format->nframes; i++) {
887 if (format->frame[i].wWidth == fival->width &&
888 format->frame[i].wHeight == fival->height) {
889 frame = &format->frame[i];
890 break;
891 }
892 }
893 if (frame == NULL)
894 return -EINVAL;
895
896 if (frame->bFrameIntervalType) {
897 if (fival->index >= frame->bFrameIntervalType)
898 return -EINVAL;
899
900 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
901 fival->discrete.numerator =
902 frame->dwFrameInterval[fival->index];
903 fival->discrete.denominator = 10000000;
904 uvc_simplify_fraction(&fival->discrete.numerator,
905 &fival->discrete.denominator, 8, 333);
906 } else {
907 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
908 fival->stepwise.min.numerator =
909 frame->dwFrameInterval[0];
910 fival->stepwise.min.denominator = 10000000;
911 fival->stepwise.max.numerator =
912 frame->dwFrameInterval[1];
913 fival->stepwise.max.denominator = 10000000;
914 fival->stepwise.step.numerator =
915 frame->dwFrameInterval[2];
916 fival->stepwise.step.denominator = 10000000;
917 uvc_simplify_fraction(&fival->stepwise.min.numerator,
918 &fival->stepwise.min.denominator, 8, 333);
919 uvc_simplify_fraction(&fival->stepwise.max.numerator,
920 &fival->stepwise.max.denominator, 8, 333);
921 uvc_simplify_fraction(&fival->stepwise.step.numerator,
922 &fival->stepwise.step.denominator, 8, 333);
923 }
924 break;
925 }
926
927 /* Get & Set streaming parameters */
928 case VIDIOC_G_PARM:
929 return uvc_v4l2_get_streamparm(stream, arg);
930
931 case VIDIOC_S_PARM:
932 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
933 if (ret < 0)
934 return ret;
935
936 if ((ret = uvc_acquire_privileges(handle)) < 0)
937 return ret;
938
939 return uvc_v4l2_set_streamparm(stream, arg);
940
941 /* Cropping and scaling */
942 case VIDIOC_CROPCAP:
943 {
944 struct v4l2_cropcap *ccap = arg;
945
946 if (ccap->type != stream->type)
947 return -EINVAL;
948
949 ccap->bounds.left = 0;
950 ccap->bounds.top = 0;
951
952 mutex_lock(&stream->mutex);
953 ccap->bounds.width = stream->cur_frame->wWidth;
954 ccap->bounds.height = stream->cur_frame->wHeight;
955 mutex_unlock(&stream->mutex);
956
957 ccap->defrect = ccap->bounds;
958
959 ccap->pixelaspect.numerator = 1;
960 ccap->pixelaspect.denominator = 1;
961 break;
962 }
963
964 case VIDIOC_G_CROP:
965 case VIDIOC_S_CROP:
966 return -ENOTTY;
967
968 /* Buffers & streaming */
969 case VIDIOC_REQBUFS:
970 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
971 if (ret < 0)
972 return ret;
973
974 if ((ret = uvc_acquire_privileges(handle)) < 0)
975 return ret;
976
977 mutex_lock(&stream->mutex);
978 ret = uvc_alloc_buffers(&stream->queue, arg);
979 mutex_unlock(&stream->mutex);
980 if (ret < 0)
981 return ret;
982
983 if (ret == 0)
984 uvc_dismiss_privileges(handle);
985
986 ret = 0;
987 break;
988
989 case VIDIOC_QUERYBUF:
990 {
991 struct v4l2_buffer *buf = arg;
992
993 if (!uvc_has_privileges(handle))
994 return -EBUSY;
995
996 return uvc_query_buffer(&stream->queue, buf);
997 }
998
999 case VIDIOC_QBUF:
1000 if (!uvc_has_privileges(handle))
1001 return -EBUSY;
1002
1003 return uvc_queue_buffer(&stream->queue, arg);
1004
1005 case VIDIOC_DQBUF:
1006 if (!uvc_has_privileges(handle))
1007 return -EBUSY;
1008
1009 return uvc_dequeue_buffer(&stream->queue, arg,
1010 file->f_flags & O_NONBLOCK);
1011
1012 case VIDIOC_STREAMON:
1013 {
1014 int *type = arg;
1015
1016 if (*type != stream->type)
1017 return -EINVAL;
1018
1019 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1020 if (ret < 0)
1021 return ret;
1022
1023 if (!uvc_has_privileges(handle))
1024 return -EBUSY;
1025
1026 mutex_lock(&stream->mutex);
1027 ret = uvc_video_enable(stream, 1);
1028 mutex_unlock(&stream->mutex);
1029 if (ret < 0)
1030 return ret;
1031 break;
1032 }
1033
1034 case VIDIOC_STREAMOFF:
1035 {
1036 int *type = arg;
1037
1038 if (*type != stream->type)
1039 return -EINVAL;
1040
1041 ret = v4l2_prio_check(vdev->prio, handle->vfh.prio);
1042 if (ret < 0)
1043 return ret;
1044
1045 if (!uvc_has_privileges(handle))
1046 return -EBUSY;
1047
1048 return uvc_video_enable(stream, 0);
1049 }
1050
1051 case VIDIOC_SUBSCRIBE_EVENT:
1052 {
1053 struct v4l2_event_subscription *sub = arg;
1054
1055 switch (sub->type) {
1056 case V4L2_EVENT_CTRL:
1057 return v4l2_event_subscribe(&handle->vfh, sub, 0,
1058 &uvc_ctrl_sub_ev_ops);
1059 default:
1060 return -EINVAL;
1061 }
1062 }
1063
1064 case VIDIOC_UNSUBSCRIBE_EVENT:
1065 return v4l2_event_unsubscribe(&handle->vfh, arg);
1066
1067 case VIDIOC_DQEVENT:
1068 return v4l2_event_dequeue(&handle->vfh, arg,
1069 file->f_flags & O_NONBLOCK);
1070
1071 /* Analog video standards make no sense for digital cameras. */
1072 case VIDIOC_ENUMSTD:
1073 case VIDIOC_QUERYSTD:
1074 case VIDIOC_G_STD:
1075 case VIDIOC_S_STD:
1076
1077 case VIDIOC_OVERLAY:
1078
1079 case VIDIOC_ENUMAUDIO:
1080 case VIDIOC_ENUMAUDOUT:
1081
1082 case VIDIOC_ENUMOUTPUT:
1083 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
1084 return -ENOTTY;
1085
1086 case UVCIOC_CTRL_MAP:
1087 return uvc_ioctl_ctrl_map(chain, arg);
1088
1089 case UVCIOC_CTRL_QUERY:
1090 return uvc_xu_ctrl_query(chain, arg);
1091
1092 default:
1093 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
1094 return -ENOTTY;
1095 }
1096
1097 return ret;
1098 }
1099
1100 static long uvc_v4l2_ioctl(struct file *file,
1101 unsigned int cmd, unsigned long arg)
1102 {
1103 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1104 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1105 v4l_printk_ioctl(NULL, cmd);
1106 printk(")\n");
1107 }
1108
1109 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1110 }
1111
1112 #ifdef CONFIG_COMPAT
1113 struct uvc_xu_control_mapping32 {
1114 __u32 id;
1115 __u8 name[32];
1116 __u8 entity[16];
1117 __u8 selector;
1118
1119 __u8 size;
1120 __u8 offset;
1121 __u32 v4l2_type;
1122 __u32 data_type;
1123
1124 compat_caddr_t menu_info;
1125 __u32 menu_count;
1126
1127 __u32 reserved[4];
1128 };
1129
1130 static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
1131 const struct uvc_xu_control_mapping32 __user *up)
1132 {
1133 struct uvc_menu_info __user *umenus;
1134 struct uvc_menu_info __user *kmenus;
1135 compat_caddr_t p;
1136
1137 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1138 __copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
1139 __get_user(kp->menu_count, &up->menu_count))
1140 return -EFAULT;
1141
1142 memset(kp->reserved, 0, sizeof(kp->reserved));
1143
1144 if (kp->menu_count == 0) {
1145 kp->menu_info = NULL;
1146 return 0;
1147 }
1148
1149 if (__get_user(p, &up->menu_info))
1150 return -EFAULT;
1151 umenus = compat_ptr(p);
1152 if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
1153 return -EFAULT;
1154
1155 kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
1156 if (kmenus == NULL)
1157 return -EFAULT;
1158 kp->menu_info = kmenus;
1159
1160 if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
1161 return -EFAULT;
1162
1163 return 0;
1164 }
1165
1166 static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
1167 struct uvc_xu_control_mapping32 __user *up)
1168 {
1169 struct uvc_menu_info __user *umenus;
1170 struct uvc_menu_info __user *kmenus = kp->menu_info;
1171 compat_caddr_t p;
1172
1173 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1174 __copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
1175 __put_user(kp->menu_count, &up->menu_count))
1176 return -EFAULT;
1177
1178 if (__clear_user(up->reserved, sizeof(up->reserved)))
1179 return -EFAULT;
1180
1181 if (kp->menu_count == 0)
1182 return 0;
1183
1184 if (get_user(p, &up->menu_info))
1185 return -EFAULT;
1186 umenus = compat_ptr(p);
1187
1188 if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
1189 return -EFAULT;
1190
1191 return 0;
1192 }
1193
1194 struct uvc_xu_control_query32 {
1195 __u8 unit;
1196 __u8 selector;
1197 __u8 query;
1198 __u16 size;
1199 compat_caddr_t data;
1200 };
1201
1202 static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
1203 const struct uvc_xu_control_query32 __user *up)
1204 {
1205 u8 __user *udata;
1206 u8 __user *kdata;
1207 compat_caddr_t p;
1208
1209 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
1210 __copy_from_user(kp, up, offsetof(typeof(*up), data)))
1211 return -EFAULT;
1212
1213 if (kp->size == 0) {
1214 kp->data = NULL;
1215 return 0;
1216 }
1217
1218 if (__get_user(p, &up->data))
1219 return -EFAULT;
1220 udata = compat_ptr(p);
1221 if (!access_ok(VERIFY_READ, udata, kp->size))
1222 return -EFAULT;
1223
1224 kdata = compat_alloc_user_space(kp->size);
1225 if (kdata == NULL)
1226 return -EFAULT;
1227 kp->data = kdata;
1228
1229 if (copy_in_user(kdata, udata, kp->size))
1230 return -EFAULT;
1231
1232 return 0;
1233 }
1234
1235 static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
1236 struct uvc_xu_control_query32 __user *up)
1237 {
1238 u8 __user *udata;
1239 u8 __user *kdata = kp->data;
1240 compat_caddr_t p;
1241
1242 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
1243 __copy_to_user(up, kp, offsetof(typeof(*up), data)))
1244 return -EFAULT;
1245
1246 if (kp->size == 0)
1247 return 0;
1248
1249 if (get_user(p, &up->data))
1250 return -EFAULT;
1251 udata = compat_ptr(p);
1252 if (!access_ok(VERIFY_READ, udata, kp->size))
1253 return -EFAULT;
1254
1255 if (copy_in_user(udata, kdata, kp->size))
1256 return -EFAULT;
1257
1258 return 0;
1259 }
1260
1261 #define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
1262 #define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
1263
1264 static long uvc_v4l2_compat_ioctl32(struct file *file,
1265 unsigned int cmd, unsigned long arg)
1266 {
1267 union {
1268 struct uvc_xu_control_mapping xmap;
1269 struct uvc_xu_control_query xqry;
1270 } karg;
1271 void __user *up = compat_ptr(arg);
1272 mm_segment_t old_fs;
1273 long ret;
1274
1275 switch (cmd) {
1276 case UVCIOC_CTRL_MAP32:
1277 cmd = UVCIOC_CTRL_MAP;
1278 ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
1279 break;
1280
1281 case UVCIOC_CTRL_QUERY32:
1282 cmd = UVCIOC_CTRL_QUERY;
1283 ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
1284 break;
1285
1286 default:
1287 return -ENOIOCTLCMD;
1288 }
1289
1290 old_fs = get_fs();
1291 set_fs(KERNEL_DS);
1292 ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
1293 set_fs(old_fs);
1294
1295 if (ret < 0)
1296 return ret;
1297
1298 switch (cmd) {
1299 case UVCIOC_CTRL_MAP:
1300 ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
1301 break;
1302
1303 case UVCIOC_CTRL_QUERY:
1304 ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
1305 break;
1306 }
1307
1308 return ret;
1309 }
1310 #endif
1311
1312 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1313 size_t count, loff_t *ppos)
1314 {
1315 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1316 return -EINVAL;
1317 }
1318
1319 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1320 {
1321 struct uvc_fh *handle = file->private_data;
1322 struct uvc_streaming *stream = handle->stream;
1323
1324 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1325
1326 return uvc_queue_mmap(&stream->queue, vma);
1327 }
1328
1329 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1330 {
1331 struct uvc_fh *handle = file->private_data;
1332 struct uvc_streaming *stream = handle->stream;
1333
1334 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1335
1336 return uvc_queue_poll(&stream->queue, file, wait);
1337 }
1338
1339 #ifndef CONFIG_MMU
1340 static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
1341 unsigned long addr, unsigned long len, unsigned long pgoff,
1342 unsigned long flags)
1343 {
1344 struct uvc_fh *handle = file->private_data;
1345 struct uvc_streaming *stream = handle->stream;
1346
1347 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
1348
1349 return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
1350 }
1351 #endif
1352
1353 const struct v4l2_file_operations uvc_fops = {
1354 .owner = THIS_MODULE,
1355 .open = uvc_v4l2_open,
1356 .release = uvc_v4l2_release,
1357 .unlocked_ioctl = uvc_v4l2_ioctl,
1358 #ifdef CONFIG_COMPAT
1359 .compat_ioctl32 = uvc_v4l2_compat_ioctl32,
1360 #endif
1361 .read = uvc_v4l2_read,
1362 .mmap = uvc_v4l2_mmap,
1363 .poll = uvc_v4l2_poll,
1364 #ifndef CONFIG_MMU
1365 .get_unmapped_area = uvc_v4l2_get_unmapped_area,
1366 #endif
1367 };
1368
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