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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[mirror_ubuntu-artful-kernel.git] / drivers / media / video / uvc / uvc_v4l2.c
1 /*
2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
3 *
4 * Copyright (C) 2005-2009
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/version.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/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 <asm/atomic.h>
25
26 #include <media/v4l2-common.h>
27 #include <media/v4l2-ioctl.h>
28
29 #include "uvcvideo.h"
30
31 /* ------------------------------------------------------------------------
32 * V4L2 interface
33 */
34
35 /*
36 * Mapping V4L2 controls to UVC controls can be straighforward if done well.
37 * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
38 * must be grouped (for instance the Red Balance, Blue Balance and Do White
39 * Balance V4L2 controls use the White Balance Component UVC control) or
40 * otherwise translated. The approach we take here is to use a translation
41 * table for the controls that can be mapped directly, and handle the others
42 * manually.
43 */
44 static int uvc_v4l2_query_menu(struct uvc_video_chain *chain,
45 struct v4l2_querymenu *query_menu)
46 {
47 struct uvc_menu_info *menu_info;
48 struct uvc_control_mapping *mapping;
49 struct uvc_control *ctrl;
50 u32 index = query_menu->index;
51 u32 id = query_menu->id;
52
53 ctrl = uvc_find_control(chain, query_menu->id, &mapping);
54 if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
55 return -EINVAL;
56
57 if (query_menu->index >= mapping->menu_count)
58 return -EINVAL;
59
60 memset(query_menu, 0, sizeof(*query_menu));
61 query_menu->id = id;
62 query_menu->index = index;
63
64 menu_info = &mapping->menu_info[query_menu->index];
65 strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
66 return 0;
67 }
68
69 /*
70 * Find the frame interval closest to the requested frame interval for the
71 * given frame format and size. This should be done by the device as part of
72 * the Video Probe and Commit negotiation, but some hardware don't implement
73 * that feature.
74 */
75 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
76 {
77 unsigned int i;
78
79 if (frame->bFrameIntervalType) {
80 __u32 best = -1, dist;
81
82 for (i = 0; i < frame->bFrameIntervalType; ++i) {
83 dist = interval > frame->dwFrameInterval[i]
84 ? interval - frame->dwFrameInterval[i]
85 : frame->dwFrameInterval[i] - interval;
86
87 if (dist > best)
88 break;
89
90 best = dist;
91 }
92
93 interval = frame->dwFrameInterval[i-1];
94 } else {
95 const __u32 min = frame->dwFrameInterval[0];
96 const __u32 max = frame->dwFrameInterval[1];
97 const __u32 step = frame->dwFrameInterval[2];
98
99 interval = min + (interval - min + step/2) / step * step;
100 if (interval > max)
101 interval = max;
102 }
103
104 return interval;
105 }
106
107 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
108 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
109 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
110 {
111 struct uvc_format *format = NULL;
112 struct uvc_frame *frame = NULL;
113 __u16 rw, rh;
114 unsigned int d, maxd;
115 unsigned int i;
116 __u32 interval;
117 int ret = 0;
118 __u8 *fcc;
119
120 if (fmt->type != stream->type)
121 return -EINVAL;
122
123 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
124 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
125 fmt->fmt.pix.pixelformat,
126 fcc[0], fcc[1], fcc[2], fcc[3],
127 fmt->fmt.pix.width, fmt->fmt.pix.height);
128
129 /* Check if the hardware supports the requested format. */
130 for (i = 0; i < stream->nformats; ++i) {
131 format = &stream->format[i];
132 if (format->fcc == fmt->fmt.pix.pixelformat)
133 break;
134 }
135
136 if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
137 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
138 fmt->fmt.pix.pixelformat);
139 return -EINVAL;
140 }
141
142 /* Find the closest image size. The distance between image sizes is
143 * the size in pixels of the non-overlapping regions between the
144 * requested size and the frame-specified size.
145 */
146 rw = fmt->fmt.pix.width;
147 rh = fmt->fmt.pix.height;
148 maxd = (unsigned int)-1;
149
150 for (i = 0; i < format->nframes; ++i) {
151 __u16 w = format->frame[i].wWidth;
152 __u16 h = format->frame[i].wHeight;
153
154 d = min(w, rw) * min(h, rh);
155 d = w*h + rw*rh - 2*d;
156 if (d < maxd) {
157 maxd = d;
158 frame = &format->frame[i];
159 }
160
161 if (maxd == 0)
162 break;
163 }
164
165 if (frame == NULL) {
166 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
167 fmt->fmt.pix.width, fmt->fmt.pix.height);
168 return -EINVAL;
169 }
170
171 /* Use the default frame interval. */
172 interval = frame->dwDefaultFrameInterval;
173 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
174 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
175 (100000000/interval)%10);
176
177 /* Set the format index, frame index and frame interval. */
178 memset(probe, 0, sizeof *probe);
179 probe->bmHint = 1; /* dwFrameInterval */
180 probe->bFormatIndex = format->index;
181 probe->bFrameIndex = frame->bFrameIndex;
182 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
183 /* Some webcams stall the probe control set request when the
184 * dwMaxVideoFrameSize field is set to zero. The UVC specification
185 * clearly states that the field is read-only from the host, so this
186 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
187 * the webcam to work around the problem.
188 *
189 * The workaround could probably be enabled for all webcams, so the
190 * quirk can be removed if needed. It's currently useful to detect
191 * webcam bugs and fix them before they hit the market (providing
192 * developers test their webcams with the Linux driver as well as with
193 * the Windows driver).
194 */
195 if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
196 probe->dwMaxVideoFrameSize =
197 stream->ctrl.dwMaxVideoFrameSize;
198
199 /* Probe the device. */
200 ret = uvc_probe_video(stream, probe);
201 if (ret < 0)
202 goto done;
203
204 fmt->fmt.pix.width = frame->wWidth;
205 fmt->fmt.pix.height = frame->wHeight;
206 fmt->fmt.pix.field = V4L2_FIELD_NONE;
207 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
208 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
209 fmt->fmt.pix.colorspace = format->colorspace;
210 fmt->fmt.pix.priv = 0;
211
212 if (uvc_format != NULL)
213 *uvc_format = format;
214 if (uvc_frame != NULL)
215 *uvc_frame = frame;
216
217 done:
218 return ret;
219 }
220
221 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
222 struct v4l2_format *fmt)
223 {
224 struct uvc_format *format = stream->cur_format;
225 struct uvc_frame *frame = stream->cur_frame;
226
227 if (fmt->type != stream->type)
228 return -EINVAL;
229
230 if (format == NULL || frame == NULL)
231 return -EINVAL;
232
233 fmt->fmt.pix.pixelformat = format->fcc;
234 fmt->fmt.pix.width = frame->wWidth;
235 fmt->fmt.pix.height = frame->wHeight;
236 fmt->fmt.pix.field = V4L2_FIELD_NONE;
237 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
238 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
239 fmt->fmt.pix.colorspace = format->colorspace;
240 fmt->fmt.pix.priv = 0;
241
242 return 0;
243 }
244
245 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
246 struct v4l2_format *fmt)
247 {
248 struct uvc_streaming_control probe;
249 struct uvc_format *format;
250 struct uvc_frame *frame;
251 int ret;
252
253 if (fmt->type != stream->type)
254 return -EINVAL;
255
256 if (uvc_queue_allocated(&stream->queue))
257 return -EBUSY;
258
259 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
260 if (ret < 0)
261 return ret;
262
263 memcpy(&stream->ctrl, &probe, sizeof probe);
264 stream->cur_format = format;
265 stream->cur_frame = frame;
266
267 return 0;
268 }
269
270 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
271 struct v4l2_streamparm *parm)
272 {
273 uint32_t numerator, denominator;
274
275 if (parm->type != stream->type)
276 return -EINVAL;
277
278 numerator = stream->ctrl.dwFrameInterval;
279 denominator = 10000000;
280 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
281
282 memset(parm, 0, sizeof *parm);
283 parm->type = stream->type;
284
285 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
286 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
287 parm->parm.capture.capturemode = 0;
288 parm->parm.capture.timeperframe.numerator = numerator;
289 parm->parm.capture.timeperframe.denominator = denominator;
290 parm->parm.capture.extendedmode = 0;
291 parm->parm.capture.readbuffers = 0;
292 } else {
293 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
294 parm->parm.output.outputmode = 0;
295 parm->parm.output.timeperframe.numerator = numerator;
296 parm->parm.output.timeperframe.denominator = denominator;
297 }
298
299 return 0;
300 }
301
302 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
303 struct v4l2_streamparm *parm)
304 {
305 struct uvc_frame *frame = stream->cur_frame;
306 struct uvc_streaming_control probe;
307 struct v4l2_fract timeperframe;
308 uint32_t interval;
309 int ret;
310
311 if (parm->type != stream->type)
312 return -EINVAL;
313
314 if (uvc_queue_streaming(&stream->queue))
315 return -EBUSY;
316
317 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
318 timeperframe = parm->parm.capture.timeperframe;
319 else
320 timeperframe = parm->parm.output.timeperframe;
321
322 memcpy(&probe, &stream->ctrl, sizeof probe);
323 interval = uvc_fraction_to_interval(timeperframe.numerator,
324 timeperframe.denominator);
325
326 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
327 timeperframe.numerator, timeperframe.denominator, interval);
328 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
329
330 /* Probe the device with the new settings. */
331 ret = uvc_probe_video(stream, &probe);
332 if (ret < 0)
333 return ret;
334
335 memcpy(&stream->ctrl, &probe, sizeof probe);
336
337 /* Return the actual frame period. */
338 timeperframe.numerator = probe.dwFrameInterval;
339 timeperframe.denominator = 10000000;
340 uvc_simplify_fraction(&timeperframe.numerator,
341 &timeperframe.denominator, 8, 333);
342
343 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
344 parm->parm.capture.timeperframe = timeperframe;
345 else
346 parm->parm.output.timeperframe = timeperframe;
347
348 return 0;
349 }
350
351 /* ------------------------------------------------------------------------
352 * Privilege management
353 */
354
355 /*
356 * Privilege management is the multiple-open implementation basis. The current
357 * implementation is completely transparent for the end-user and doesn't
358 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
359 * Those ioctls enable finer control on the device (by making possible for a
360 * user to request exclusive access to a device), but are not mature yet.
361 * Switching to the V4L2 priority mechanism might be considered in the future
362 * if this situation changes.
363 *
364 * Each open instance of a UVC device can either be in a privileged or
365 * unprivileged state. Only a single instance can be in a privileged state at
366 * a given time. Trying to perform an operation that requires privileges will
367 * automatically acquire the required privileges if possible, or return -EBUSY
368 * otherwise. Privileges are dismissed when closing the instance or when
369 * freeing the video buffers using VIDIOC_REQBUFS.
370 *
371 * Operations that require privileges are:
372 *
373 * - VIDIOC_S_INPUT
374 * - VIDIOC_S_PARM
375 * - VIDIOC_S_FMT
376 * - VIDIOC_REQBUFS
377 */
378 static int uvc_acquire_privileges(struct uvc_fh *handle)
379 {
380 /* Always succeed if the handle is already privileged. */
381 if (handle->state == UVC_HANDLE_ACTIVE)
382 return 0;
383
384 /* Check if the device already has a privileged handle. */
385 if (atomic_inc_return(&handle->stream->active) != 1) {
386 atomic_dec(&handle->stream->active);
387 return -EBUSY;
388 }
389
390 handle->state = UVC_HANDLE_ACTIVE;
391 return 0;
392 }
393
394 static void uvc_dismiss_privileges(struct uvc_fh *handle)
395 {
396 if (handle->state == UVC_HANDLE_ACTIVE)
397 atomic_dec(&handle->stream->active);
398
399 handle->state = UVC_HANDLE_PASSIVE;
400 }
401
402 static int uvc_has_privileges(struct uvc_fh *handle)
403 {
404 return handle->state == UVC_HANDLE_ACTIVE;
405 }
406
407 /* ------------------------------------------------------------------------
408 * V4L2 file operations
409 */
410
411 static int uvc_v4l2_open(struct file *file)
412 {
413 struct uvc_streaming *stream;
414 struct uvc_fh *handle;
415 int ret = 0;
416
417 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
418 stream = video_drvdata(file);
419
420 if (stream->dev->state & UVC_DEV_DISCONNECTED)
421 return -ENODEV;
422
423 ret = usb_autopm_get_interface(stream->dev->intf);
424 if (ret < 0)
425 return ret;
426
427 /* Create the device handle. */
428 handle = kzalloc(sizeof *handle, GFP_KERNEL);
429 if (handle == NULL) {
430 usb_autopm_put_interface(stream->dev->intf);
431 return -ENOMEM;
432 }
433
434 if (atomic_inc_return(&stream->dev->users) == 1) {
435 ret = uvc_status_start(stream->dev);
436 if (ret < 0) {
437 usb_autopm_put_interface(stream->dev->intf);
438 atomic_dec(&stream->dev->users);
439 kfree(handle);
440 return ret;
441 }
442 }
443
444 handle->chain = stream->chain;
445 handle->stream = stream;
446 handle->state = UVC_HANDLE_PASSIVE;
447 file->private_data = handle;
448
449 return 0;
450 }
451
452 static int uvc_v4l2_release(struct file *file)
453 {
454 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
455 struct uvc_streaming *stream = handle->stream;
456
457 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
458
459 /* Only free resources if this is a privileged handle. */
460 if (uvc_has_privileges(handle)) {
461 uvc_video_enable(stream, 0);
462
463 mutex_lock(&stream->queue.mutex);
464 if (uvc_free_buffers(&stream->queue) < 0)
465 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
466 "free buffers.\n");
467 mutex_unlock(&stream->queue.mutex);
468 }
469
470 /* Release the file handle. */
471 uvc_dismiss_privileges(handle);
472 kfree(handle);
473 file->private_data = NULL;
474
475 if (atomic_dec_return(&stream->dev->users) == 0)
476 uvc_status_stop(stream->dev);
477
478 usb_autopm_put_interface(stream->dev->intf);
479 return 0;
480 }
481
482 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
483 {
484 struct video_device *vdev = video_devdata(file);
485 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
486 struct uvc_video_chain *chain = handle->chain;
487 struct uvc_streaming *stream = handle->stream;
488 long ret = 0;
489
490 switch (cmd) {
491 /* Query capabilities */
492 case VIDIOC_QUERYCAP:
493 {
494 struct v4l2_capability *cap = arg;
495
496 memset(cap, 0, sizeof *cap);
497 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
498 strlcpy(cap->card, vdev->name, sizeof cap->card);
499 usb_make_path(stream->dev->udev,
500 cap->bus_info, sizeof(cap->bus_info));
501 cap->version = DRIVER_VERSION_NUMBER;
502 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
503 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
504 | V4L2_CAP_STREAMING;
505 else
506 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
507 | V4L2_CAP_STREAMING;
508 break;
509 }
510
511 /* Get, Set & Query control */
512 case VIDIOC_QUERYCTRL:
513 return uvc_query_v4l2_ctrl(chain, arg);
514
515 case VIDIOC_G_CTRL:
516 {
517 struct v4l2_control *ctrl = arg;
518 struct v4l2_ext_control xctrl;
519
520 memset(&xctrl, 0, sizeof xctrl);
521 xctrl.id = ctrl->id;
522
523 ret = uvc_ctrl_begin(chain);
524 if (ret < 0)
525 return ret;
526
527 ret = uvc_ctrl_get(chain, &xctrl);
528 uvc_ctrl_rollback(chain);
529 if (ret >= 0)
530 ctrl->value = xctrl.value;
531 break;
532 }
533
534 case VIDIOC_S_CTRL:
535 {
536 struct v4l2_control *ctrl = arg;
537 struct v4l2_ext_control xctrl;
538
539 memset(&xctrl, 0, sizeof xctrl);
540 xctrl.id = ctrl->id;
541 xctrl.value = ctrl->value;
542
543 ret = uvc_ctrl_begin(chain);
544 if (ret < 0)
545 return ret;
546
547 ret = uvc_ctrl_set(chain, &xctrl);
548 if (ret < 0) {
549 uvc_ctrl_rollback(chain);
550 return ret;
551 }
552 ret = uvc_ctrl_commit(chain);
553 if (ret == 0)
554 ctrl->value = xctrl.value;
555 break;
556 }
557
558 case VIDIOC_QUERYMENU:
559 return uvc_v4l2_query_menu(chain, arg);
560
561 case VIDIOC_G_EXT_CTRLS:
562 {
563 struct v4l2_ext_controls *ctrls = arg;
564 struct v4l2_ext_control *ctrl = ctrls->controls;
565 unsigned int i;
566
567 ret = uvc_ctrl_begin(chain);
568 if (ret < 0)
569 return ret;
570
571 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
572 ret = uvc_ctrl_get(chain, ctrl);
573 if (ret < 0) {
574 uvc_ctrl_rollback(chain);
575 ctrls->error_idx = i;
576 return ret;
577 }
578 }
579 ctrls->error_idx = 0;
580 ret = uvc_ctrl_rollback(chain);
581 break;
582 }
583
584 case VIDIOC_S_EXT_CTRLS:
585 case VIDIOC_TRY_EXT_CTRLS:
586 {
587 struct v4l2_ext_controls *ctrls = arg;
588 struct v4l2_ext_control *ctrl = ctrls->controls;
589 unsigned int i;
590
591 ret = uvc_ctrl_begin(chain);
592 if (ret < 0)
593 return ret;
594
595 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
596 ret = uvc_ctrl_set(chain, ctrl);
597 if (ret < 0) {
598 uvc_ctrl_rollback(chain);
599 ctrls->error_idx = i;
600 return ret;
601 }
602 }
603
604 ctrls->error_idx = 0;
605
606 if (cmd == VIDIOC_S_EXT_CTRLS)
607 ret = uvc_ctrl_commit(chain);
608 else
609 ret = uvc_ctrl_rollback(chain);
610 break;
611 }
612
613 /* Get, Set & Enum input */
614 case VIDIOC_ENUMINPUT:
615 {
616 const struct uvc_entity *selector = chain->selector;
617 struct v4l2_input *input = arg;
618 struct uvc_entity *iterm = NULL;
619 u32 index = input->index;
620 int pin = 0;
621
622 if (selector == NULL ||
623 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
624 if (index != 0)
625 return -EINVAL;
626 list_for_each_entry(iterm, &chain->entities, chain) {
627 if (UVC_ENTITY_IS_ITERM(iterm))
628 break;
629 }
630 pin = iterm->id;
631 } else if (pin < selector->bNrInPins) {
632 pin = selector->baSourceID[index];
633 list_for_each_entry(iterm, &chain->entities, chain) {
634 if (!UVC_ENTITY_IS_ITERM(iterm))
635 continue;
636 if (iterm->id == pin)
637 break;
638 }
639 }
640
641 if (iterm == NULL || iterm->id != pin)
642 return -EINVAL;
643
644 memset(input, 0, sizeof *input);
645 input->index = index;
646 strlcpy(input->name, iterm->name, sizeof input->name);
647 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
648 input->type = V4L2_INPUT_TYPE_CAMERA;
649 break;
650 }
651
652 case VIDIOC_G_INPUT:
653 {
654 u8 input;
655
656 if (chain->selector == NULL ||
657 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
658 *(int *)arg = 0;
659 break;
660 }
661
662 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
663 chain->selector->id, chain->dev->intfnum,
664 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
665 if (ret < 0)
666 return ret;
667
668 *(int *)arg = input - 1;
669 break;
670 }
671
672 case VIDIOC_S_INPUT:
673 {
674 u32 input = *(u32 *)arg + 1;
675
676 if ((ret = uvc_acquire_privileges(handle)) < 0)
677 return ret;
678
679 if (chain->selector == NULL ||
680 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
681 if (input != 1)
682 return -EINVAL;
683 break;
684 }
685
686 if (input == 0 || input > chain->selector->bNrInPins)
687 return -EINVAL;
688
689 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
690 chain->selector->id, chain->dev->intfnum,
691 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
692 }
693
694 /* Try, Get, Set & Enum format */
695 case VIDIOC_ENUM_FMT:
696 {
697 struct v4l2_fmtdesc *fmt = arg;
698 struct uvc_format *format;
699 enum v4l2_buf_type type = fmt->type;
700 __u32 index = fmt->index;
701
702 if (fmt->type != stream->type ||
703 fmt->index >= stream->nformats)
704 return -EINVAL;
705
706 memset(fmt, 0, sizeof(*fmt));
707 fmt->index = index;
708 fmt->type = type;
709
710 format = &stream->format[fmt->index];
711 fmt->flags = 0;
712 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
713 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
714 strlcpy(fmt->description, format->name,
715 sizeof fmt->description);
716 fmt->description[sizeof fmt->description - 1] = 0;
717 fmt->pixelformat = format->fcc;
718 break;
719 }
720
721 case VIDIOC_TRY_FMT:
722 {
723 struct uvc_streaming_control probe;
724
725 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
726 }
727
728 case VIDIOC_S_FMT:
729 if ((ret = uvc_acquire_privileges(handle)) < 0)
730 return ret;
731
732 return uvc_v4l2_set_format(stream, arg);
733
734 case VIDIOC_G_FMT:
735 return uvc_v4l2_get_format(stream, arg);
736
737 /* Frame size enumeration */
738 case VIDIOC_ENUM_FRAMESIZES:
739 {
740 struct v4l2_frmsizeenum *fsize = arg;
741 struct uvc_format *format = NULL;
742 struct uvc_frame *frame;
743 int i;
744
745 /* Look for the given pixel format */
746 for (i = 0; i < stream->nformats; i++) {
747 if (stream->format[i].fcc ==
748 fsize->pixel_format) {
749 format = &stream->format[i];
750 break;
751 }
752 }
753 if (format == NULL)
754 return -EINVAL;
755
756 if (fsize->index >= format->nframes)
757 return -EINVAL;
758
759 frame = &format->frame[fsize->index];
760 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
761 fsize->discrete.width = frame->wWidth;
762 fsize->discrete.height = frame->wHeight;
763 break;
764 }
765
766 /* Frame interval enumeration */
767 case VIDIOC_ENUM_FRAMEINTERVALS:
768 {
769 struct v4l2_frmivalenum *fival = arg;
770 struct uvc_format *format = NULL;
771 struct uvc_frame *frame = NULL;
772 int i;
773
774 /* Look for the given pixel format and frame size */
775 for (i = 0; i < stream->nformats; i++) {
776 if (stream->format[i].fcc ==
777 fival->pixel_format) {
778 format = &stream->format[i];
779 break;
780 }
781 }
782 if (format == NULL)
783 return -EINVAL;
784
785 for (i = 0; i < format->nframes; i++) {
786 if (format->frame[i].wWidth == fival->width &&
787 format->frame[i].wHeight == fival->height) {
788 frame = &format->frame[i];
789 break;
790 }
791 }
792 if (frame == NULL)
793 return -EINVAL;
794
795 if (frame->bFrameIntervalType) {
796 if (fival->index >= frame->bFrameIntervalType)
797 return -EINVAL;
798
799 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
800 fival->discrete.numerator =
801 frame->dwFrameInterval[fival->index];
802 fival->discrete.denominator = 10000000;
803 uvc_simplify_fraction(&fival->discrete.numerator,
804 &fival->discrete.denominator, 8, 333);
805 } else {
806 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
807 fival->stepwise.min.numerator =
808 frame->dwFrameInterval[0];
809 fival->stepwise.min.denominator = 10000000;
810 fival->stepwise.max.numerator =
811 frame->dwFrameInterval[1];
812 fival->stepwise.max.denominator = 10000000;
813 fival->stepwise.step.numerator =
814 frame->dwFrameInterval[2];
815 fival->stepwise.step.denominator = 10000000;
816 uvc_simplify_fraction(&fival->stepwise.min.numerator,
817 &fival->stepwise.min.denominator, 8, 333);
818 uvc_simplify_fraction(&fival->stepwise.max.numerator,
819 &fival->stepwise.max.denominator, 8, 333);
820 uvc_simplify_fraction(&fival->stepwise.step.numerator,
821 &fival->stepwise.step.denominator, 8, 333);
822 }
823 break;
824 }
825
826 /* Get & Set streaming parameters */
827 case VIDIOC_G_PARM:
828 return uvc_v4l2_get_streamparm(stream, arg);
829
830 case VIDIOC_S_PARM:
831 if ((ret = uvc_acquire_privileges(handle)) < 0)
832 return ret;
833
834 return uvc_v4l2_set_streamparm(stream, arg);
835
836 /* Cropping and scaling */
837 case VIDIOC_CROPCAP:
838 {
839 struct v4l2_cropcap *ccap = arg;
840 struct uvc_frame *frame = stream->cur_frame;
841
842 if (ccap->type != stream->type)
843 return -EINVAL;
844
845 ccap->bounds.left = 0;
846 ccap->bounds.top = 0;
847 ccap->bounds.width = frame->wWidth;
848 ccap->bounds.height = frame->wHeight;
849
850 ccap->defrect = ccap->bounds;
851
852 ccap->pixelaspect.numerator = 1;
853 ccap->pixelaspect.denominator = 1;
854 break;
855 }
856
857 case VIDIOC_G_CROP:
858 case VIDIOC_S_CROP:
859 return -EINVAL;
860
861 /* Buffers & streaming */
862 case VIDIOC_REQBUFS:
863 {
864 struct v4l2_requestbuffers *rb = arg;
865 unsigned int bufsize =
866 stream->ctrl.dwMaxVideoFrameSize;
867
868 if (rb->type != stream->type ||
869 rb->memory != V4L2_MEMORY_MMAP)
870 return -EINVAL;
871
872 if ((ret = uvc_acquire_privileges(handle)) < 0)
873 return ret;
874
875 ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize);
876 if (ret < 0)
877 return ret;
878
879 if (ret == 0)
880 uvc_dismiss_privileges(handle);
881
882 rb->count = ret;
883 ret = 0;
884 break;
885 }
886
887 case VIDIOC_QUERYBUF:
888 {
889 struct v4l2_buffer *buf = arg;
890
891 if (buf->type != stream->type)
892 return -EINVAL;
893
894 if (!uvc_has_privileges(handle))
895 return -EBUSY;
896
897 return uvc_query_buffer(&stream->queue, buf);
898 }
899
900 case VIDIOC_QBUF:
901 if (!uvc_has_privileges(handle))
902 return -EBUSY;
903
904 return uvc_queue_buffer(&stream->queue, arg);
905
906 case VIDIOC_DQBUF:
907 if (!uvc_has_privileges(handle))
908 return -EBUSY;
909
910 return uvc_dequeue_buffer(&stream->queue, arg,
911 file->f_flags & O_NONBLOCK);
912
913 case VIDIOC_STREAMON:
914 {
915 int *type = arg;
916
917 if (*type != stream->type)
918 return -EINVAL;
919
920 if (!uvc_has_privileges(handle))
921 return -EBUSY;
922
923 ret = uvc_video_enable(stream, 1);
924 if (ret < 0)
925 return ret;
926 break;
927 }
928
929 case VIDIOC_STREAMOFF:
930 {
931 int *type = arg;
932
933 if (*type != stream->type)
934 return -EINVAL;
935
936 if (!uvc_has_privileges(handle))
937 return -EBUSY;
938
939 return uvc_video_enable(stream, 0);
940 }
941
942 /* Analog video standards make no sense for digital cameras. */
943 case VIDIOC_ENUMSTD:
944 case VIDIOC_QUERYSTD:
945 case VIDIOC_G_STD:
946 case VIDIOC_S_STD:
947
948 case VIDIOC_OVERLAY:
949
950 case VIDIOC_ENUMAUDIO:
951 case VIDIOC_ENUMAUDOUT:
952
953 case VIDIOC_ENUMOUTPUT:
954 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
955 return -EINVAL;
956
957 /* Dynamic controls. */
958 case UVCIOC_CTRL_ADD:
959 {
960 struct uvc_xu_control_info *xinfo = arg;
961 struct uvc_control_info *info;
962
963 if (!capable(CAP_SYS_ADMIN))
964 return -EPERM;
965
966 info = kzalloc(sizeof *info, GFP_KERNEL);
967 if (info == NULL)
968 return -ENOMEM;
969
970 memcpy(info->entity, xinfo->entity, sizeof info->entity);
971 info->index = xinfo->index;
972 info->selector = xinfo->selector;
973 info->size = xinfo->size;
974 info->flags = xinfo->flags;
975
976 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
977 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
978
979 ret = uvc_ctrl_add_info(info);
980 if (ret < 0)
981 kfree(info);
982 break;
983 }
984
985 case UVCIOC_CTRL_MAP:
986 {
987 struct uvc_xu_control_mapping *xmap = arg;
988 struct uvc_control_mapping *map;
989
990 if (!capable(CAP_SYS_ADMIN))
991 return -EPERM;
992
993 map = kzalloc(sizeof *map, GFP_KERNEL);
994 if (map == NULL)
995 return -ENOMEM;
996
997 map->id = xmap->id;
998 memcpy(map->name, xmap->name, sizeof map->name);
999 memcpy(map->entity, xmap->entity, sizeof map->entity);
1000 map->selector = xmap->selector;
1001 map->size = xmap->size;
1002 map->offset = xmap->offset;
1003 map->v4l2_type = xmap->v4l2_type;
1004 map->data_type = xmap->data_type;
1005
1006 ret = uvc_ctrl_add_mapping(map);
1007 if (ret < 0)
1008 kfree(map);
1009 break;
1010 }
1011
1012 case UVCIOC_CTRL_GET:
1013 return uvc_xu_ctrl_query(chain, arg, 0);
1014
1015 case UVCIOC_CTRL_SET:
1016 return uvc_xu_ctrl_query(chain, arg, 1);
1017
1018 default:
1019 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1020 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1021 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1022 cmd);
1023 return ret;
1024 }
1025
1026 return ret;
1027 }
1028
1029 static long uvc_v4l2_ioctl(struct file *file,
1030 unsigned int cmd, unsigned long arg)
1031 {
1032 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1033 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1034 v4l_printk_ioctl(cmd);
1035 printk(")\n");
1036 }
1037
1038 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1039 }
1040
1041 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1042 size_t count, loff_t *ppos)
1043 {
1044 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1045 return -EINVAL;
1046 }
1047
1048 /*
1049 * VMA operations.
1050 */
1051 static void uvc_vm_open(struct vm_area_struct *vma)
1052 {
1053 struct uvc_buffer *buffer = vma->vm_private_data;
1054 buffer->vma_use_count++;
1055 }
1056
1057 static void uvc_vm_close(struct vm_area_struct *vma)
1058 {
1059 struct uvc_buffer *buffer = vma->vm_private_data;
1060 buffer->vma_use_count--;
1061 }
1062
1063 static const struct vm_operations_struct uvc_vm_ops = {
1064 .open = uvc_vm_open,
1065 .close = uvc_vm_close,
1066 };
1067
1068 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1069 {
1070 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1071 struct uvc_streaming *stream = handle->stream;
1072 struct uvc_video_queue *queue = &stream->queue;
1073 struct uvc_buffer *uninitialized_var(buffer);
1074 struct page *page;
1075 unsigned long addr, start, size;
1076 unsigned int i;
1077 int ret = 0;
1078
1079 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1080
1081 start = vma->vm_start;
1082 size = vma->vm_end - vma->vm_start;
1083
1084 mutex_lock(&queue->mutex);
1085
1086 for (i = 0; i < queue->count; ++i) {
1087 buffer = &queue->buffer[i];
1088 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1089 break;
1090 }
1091
1092 if (i == queue->count || size != queue->buf_size) {
1093 ret = -EINVAL;
1094 goto done;
1095 }
1096
1097 /*
1098 * VM_IO marks the area as being an mmaped region for I/O to a
1099 * device. It also prevents the region from being core dumped.
1100 */
1101 vma->vm_flags |= VM_IO;
1102
1103 addr = (unsigned long)queue->mem + buffer->buf.m.offset;
1104 while (size > 0) {
1105 page = vmalloc_to_page((void *)addr);
1106 if ((ret = vm_insert_page(vma, start, page)) < 0)
1107 goto done;
1108
1109 start += PAGE_SIZE;
1110 addr += PAGE_SIZE;
1111 size -= PAGE_SIZE;
1112 }
1113
1114 vma->vm_ops = &uvc_vm_ops;
1115 vma->vm_private_data = buffer;
1116 uvc_vm_open(vma);
1117
1118 done:
1119 mutex_unlock(&queue->mutex);
1120 return ret;
1121 }
1122
1123 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1124 {
1125 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1126 struct uvc_streaming *stream = handle->stream;
1127
1128 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1129
1130 return uvc_queue_poll(&stream->queue, file, wait);
1131 }
1132
1133 const struct v4l2_file_operations uvc_fops = {
1134 .owner = THIS_MODULE,
1135 .open = uvc_v4l2_open,
1136 .release = uvc_v4l2_release,
1137 .ioctl = uvc_v4l2_ioctl,
1138 .read = uvc_v4l2_read,
1139 .mmap = uvc_v4l2_mmap,
1140 .poll = uvc_v4l2_poll,
1141 };
1142
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