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/usb.h>
19 #include <linux/videodev2.h>
20 #include <linux/vmalloc.h>
21 #include <linux/mm.h>
22 #include <linux/wait.h>
23 #include <asm/atomic.h>
24
25 #include <media/v4l2-common.h>
26 #include <media/v4l2-ioctl.h>
27
28 #include "uvcvideo.h"
29
30 /* ------------------------------------------------------------------------
31 * V4L2 interface
32 */
33
34 /*
35 * Mapping V4L2 controls to UVC controls can be straighforward if done well.
36 * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
37 * must be grouped (for instance the Red Balance, Blue Balance and Do White
38 * Balance V4L2 controls use the White Balance Component UVC control) or
39 * otherwise translated. The approach we take here is to use a translation
40 * table for the controls that can be mapped directly, and handle the others
41 * manually.
42 */
43 static int uvc_v4l2_query_menu(struct uvc_video_device *video,
44 struct v4l2_querymenu *query_menu)
45 {
46 struct uvc_menu_info *menu_info;
47 struct uvc_control_mapping *mapping;
48 struct uvc_control *ctrl;
49 u32 index = query_menu->index;
50 u32 id = query_menu->id;
51
52 ctrl = uvc_find_control(video, query_menu->id, &mapping);
53 if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
54 return -EINVAL;
55
56 if (query_menu->index >= mapping->menu_count)
57 return -EINVAL;
58
59 memset(query_menu, 0, sizeof(*query_menu));
60 query_menu->id = id;
61 query_menu->index = index;
62
63 menu_info = &mapping->menu_info[query_menu->index];
64 strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
65 return 0;
66 }
67
68 /*
69 * Find the frame interval closest to the requested frame interval for the
70 * given frame format and size. This should be done by the device as part of
71 * the Video Probe and Commit negotiation, but some hardware don't implement
72 * that feature.
73 */
74 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
75 {
76 unsigned int i;
77
78 if (frame->bFrameIntervalType) {
79 __u32 best = -1, dist;
80
81 for (i = 0; i < frame->bFrameIntervalType; ++i) {
82 dist = interval > frame->dwFrameInterval[i]
83 ? interval - frame->dwFrameInterval[i]
84 : frame->dwFrameInterval[i] - interval;
85
86 if (dist > best)
87 break;
88
89 best = dist;
90 }
91
92 interval = frame->dwFrameInterval[i-1];
93 } else {
94 const __u32 min = frame->dwFrameInterval[0];
95 const __u32 max = frame->dwFrameInterval[1];
96 const __u32 step = frame->dwFrameInterval[2];
97
98 interval = min + (interval - min + step/2) / step * step;
99 if (interval > max)
100 interval = max;
101 }
102
103 return interval;
104 }
105
106 static int uvc_v4l2_try_format(struct uvc_video_device *video,
107 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
108 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
109 {
110 struct uvc_format *format = NULL;
111 struct uvc_frame *frame = NULL;
112 __u16 rw, rh;
113 unsigned int d, maxd;
114 unsigned int i;
115 __u32 interval;
116 int ret = 0;
117 __u8 *fcc;
118
119 if (fmt->type != video->streaming->type)
120 return -EINVAL;
121
122 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
123 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
124 fmt->fmt.pix.pixelformat,
125 fcc[0], fcc[1], fcc[2], fcc[3],
126 fmt->fmt.pix.width, fmt->fmt.pix.height);
127
128 /* Check if the hardware supports the requested format. */
129 for (i = 0; i < video->streaming->nformats; ++i) {
130 format = &video->streaming->format[i];
131 if (format->fcc == fmt->fmt.pix.pixelformat)
132 break;
133 }
134
135 if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
136 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
137 fmt->fmt.pix.pixelformat);
138 return -EINVAL;
139 }
140
141 /* Find the closest image size. The distance between image sizes is
142 * the size in pixels of the non-overlapping regions between the
143 * requested size and the frame-specified size.
144 */
145 rw = fmt->fmt.pix.width;
146 rh = fmt->fmt.pix.height;
147 maxd = (unsigned int)-1;
148
149 for (i = 0; i < format->nframes; ++i) {
150 __u16 w = format->frame[i].wWidth;
151 __u16 h = format->frame[i].wHeight;
152
153 d = min(w, rw) * min(h, rh);
154 d = w*h + rw*rh - 2*d;
155 if (d < maxd) {
156 maxd = d;
157 frame = &format->frame[i];
158 }
159
160 if (maxd == 0)
161 break;
162 }
163
164 if (frame == NULL) {
165 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
166 fmt->fmt.pix.width, fmt->fmt.pix.height);
167 return -EINVAL;
168 }
169
170 /* Use the default frame interval. */
171 interval = frame->dwDefaultFrameInterval;
172 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
173 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
174 (100000000/interval)%10);
175
176 /* Set the format index, frame index and frame interval. */
177 memset(probe, 0, sizeof *probe);
178 probe->bmHint = 1; /* dwFrameInterval */
179 probe->bFormatIndex = format->index;
180 probe->bFrameIndex = frame->bFrameIndex;
181 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
182 /* Some webcams stall the probe control set request when the
183 * dwMaxVideoFrameSize field is set to zero. The UVC specification
184 * clearly states that the field is read-only from the host, so this
185 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
186 * the webcam to work around the problem.
187 *
188 * The workaround could probably be enabled for all webcams, so the
189 * quirk can be removed if needed. It's currently useful to detect
190 * webcam bugs and fix them before they hit the market (providing
191 * developers test their webcams with the Linux driver as well as with
192 * the Windows driver).
193 */
194 if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
195 probe->dwMaxVideoFrameSize =
196 video->streaming->ctrl.dwMaxVideoFrameSize;
197
198 /* Probe the device. */
199 if ((ret = uvc_probe_video(video, probe)) < 0)
200 goto done;
201
202 fmt->fmt.pix.width = frame->wWidth;
203 fmt->fmt.pix.height = frame->wHeight;
204 fmt->fmt.pix.field = V4L2_FIELD_NONE;
205 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
206 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
207 fmt->fmt.pix.colorspace = format->colorspace;
208 fmt->fmt.pix.priv = 0;
209
210 if (uvc_format != NULL)
211 *uvc_format = format;
212 if (uvc_frame != NULL)
213 *uvc_frame = frame;
214
215 done:
216 return ret;
217 }
218
219 static int uvc_v4l2_get_format(struct uvc_video_device *video,
220 struct v4l2_format *fmt)
221 {
222 struct uvc_format *format = video->streaming->cur_format;
223 struct uvc_frame *frame = video->streaming->cur_frame;
224
225 if (fmt->type != video->streaming->type)
226 return -EINVAL;
227
228 if (format == NULL || frame == NULL)
229 return -EINVAL;
230
231 fmt->fmt.pix.pixelformat = format->fcc;
232 fmt->fmt.pix.width = frame->wWidth;
233 fmt->fmt.pix.height = frame->wHeight;
234 fmt->fmt.pix.field = V4L2_FIELD_NONE;
235 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
236 fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
237 fmt->fmt.pix.colorspace = format->colorspace;
238 fmt->fmt.pix.priv = 0;
239
240 return 0;
241 }
242
243 static int uvc_v4l2_set_format(struct uvc_video_device *video,
244 struct v4l2_format *fmt)
245 {
246 struct uvc_streaming_control probe;
247 struct uvc_format *format;
248 struct uvc_frame *frame;
249 int ret;
250
251 if (fmt->type != video->streaming->type)
252 return -EINVAL;
253
254 if (uvc_queue_allocated(&video->queue))
255 return -EBUSY;
256
257 ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
258 if (ret < 0)
259 return ret;
260
261 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
262 video->streaming->cur_format = format;
263 video->streaming->cur_frame = frame;
264
265 return 0;
266 }
267
268 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
269 struct v4l2_streamparm *parm)
270 {
271 uint32_t numerator, denominator;
272
273 if (parm->type != video->streaming->type)
274 return -EINVAL;
275
276 numerator = video->streaming->ctrl.dwFrameInterval;
277 denominator = 10000000;
278 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
279
280 memset(parm, 0, sizeof *parm);
281 parm->type = video->streaming->type;
282
283 if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
284 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
285 parm->parm.capture.capturemode = 0;
286 parm->parm.capture.timeperframe.numerator = numerator;
287 parm->parm.capture.timeperframe.denominator = denominator;
288 parm->parm.capture.extendedmode = 0;
289 parm->parm.capture.readbuffers = 0;
290 } else {
291 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
292 parm->parm.output.outputmode = 0;
293 parm->parm.output.timeperframe.numerator = numerator;
294 parm->parm.output.timeperframe.denominator = denominator;
295 }
296
297 return 0;
298 }
299
300 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
301 struct v4l2_streamparm *parm)
302 {
303 struct uvc_frame *frame = video->streaming->cur_frame;
304 struct uvc_streaming_control probe;
305 struct v4l2_fract timeperframe;
306 uint32_t interval;
307 int ret;
308
309 if (parm->type != video->streaming->type)
310 return -EINVAL;
311
312 if (uvc_queue_streaming(&video->queue))
313 return -EBUSY;
314
315 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
316 timeperframe = parm->parm.capture.timeperframe;
317 else
318 timeperframe = parm->parm.output.timeperframe;
319
320 memcpy(&probe, &video->streaming->ctrl, sizeof probe);
321 interval = uvc_fraction_to_interval(timeperframe.numerator,
322 timeperframe.denominator);
323
324 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
325 timeperframe.numerator, timeperframe.denominator, interval);
326 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
327
328 /* Probe the device with the new settings. */
329 if ((ret = uvc_probe_video(video, &probe)) < 0)
330 return ret;
331
332 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
333
334 /* Return the actual frame period. */
335 timeperframe.numerator = probe.dwFrameInterval;
336 timeperframe.denominator = 10000000;
337 uvc_simplify_fraction(&timeperframe.numerator,
338 &timeperframe.denominator, 8, 333);
339
340 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
341 parm->parm.capture.timeperframe = timeperframe;
342 else
343 parm->parm.output.timeperframe = timeperframe;
344
345 return 0;
346 }
347
348 /* ------------------------------------------------------------------------
349 * Privilege management
350 */
351
352 /*
353 * Privilege management is the multiple-open implementation basis. The current
354 * implementation is completely transparent for the end-user and doesn't
355 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
356 * Those ioctls enable finer control on the device (by making possible for a
357 * user to request exclusive access to a device), but are not mature yet.
358 * Switching to the V4L2 priority mechanism might be considered in the future
359 * if this situation changes.
360 *
361 * Each open instance of a UVC device can either be in a privileged or
362 * unprivileged state. Only a single instance can be in a privileged state at
363 * a given time. Trying to perform an operation that requires privileges will
364 * automatically acquire the required privileges if possible, or return -EBUSY
365 * otherwise. Privileges are dismissed when closing the instance.
366 *
367 * Operations that require privileges are:
368 *
369 * - VIDIOC_S_INPUT
370 * - VIDIOC_S_PARM
371 * - VIDIOC_S_FMT
372 * - VIDIOC_TRY_FMT
373 * - VIDIOC_REQBUFS
374 */
375 static int uvc_acquire_privileges(struct uvc_fh *handle)
376 {
377 int ret = 0;
378
379 /* Always succeed if the handle is already privileged. */
380 if (handle->state == UVC_HANDLE_ACTIVE)
381 return 0;
382
383 /* Check if the device already has a privileged handle. */
384 mutex_lock(&uvc_driver.open_mutex);
385 if (atomic_inc_return(&handle->device->active) != 1) {
386 atomic_dec(&handle->device->active);
387 ret = -EBUSY;
388 goto done;
389 }
390
391 handle->state = UVC_HANDLE_ACTIVE;
392
393 done:
394 mutex_unlock(&uvc_driver.open_mutex);
395 return ret;
396 }
397
398 static void uvc_dismiss_privileges(struct uvc_fh *handle)
399 {
400 if (handle->state == UVC_HANDLE_ACTIVE)
401 atomic_dec(&handle->device->active);
402
403 handle->state = UVC_HANDLE_PASSIVE;
404 }
405
406 static int uvc_has_privileges(struct uvc_fh *handle)
407 {
408 return handle->state == UVC_HANDLE_ACTIVE;
409 }
410
411 /* ------------------------------------------------------------------------
412 * V4L2 file operations
413 */
414
415 static int uvc_v4l2_open(struct file *file)
416 {
417 struct uvc_video_device *video;
418 struct uvc_fh *handle;
419 int ret = 0;
420
421 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
422 mutex_lock(&uvc_driver.open_mutex);
423 video = video_drvdata(file);
424
425 if (video->dev->state & UVC_DEV_DISCONNECTED) {
426 ret = -ENODEV;
427 goto done;
428 }
429
430 ret = usb_autopm_get_interface(video->dev->intf);
431 if (ret < 0)
432 goto done;
433
434 /* Create the device handle. */
435 handle = kzalloc(sizeof *handle, GFP_KERNEL);
436 if (handle == NULL) {
437 usb_autopm_put_interface(video->dev->intf);
438 ret = -ENOMEM;
439 goto done;
440 }
441
442 if (atomic_inc_return(&video->dev->users) == 1) {
443 if ((ret = uvc_status_start(video->dev)) < 0) {
444 usb_autopm_put_interface(video->dev->intf);
445 atomic_dec(&video->dev->users);
446 kfree(handle);
447 goto done;
448 }
449 }
450
451 handle->device = video;
452 handle->state = UVC_HANDLE_PASSIVE;
453 file->private_data = handle;
454
455 kref_get(&video->dev->kref);
456
457 done:
458 mutex_unlock(&uvc_driver.open_mutex);
459 return ret;
460 }
461
462 static int uvc_v4l2_release(struct file *file)
463 {
464 struct uvc_video_device *video = video_drvdata(file);
465 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
466
467 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
468
469 /* Only free resources if this is a privileged handle. */
470 if (uvc_has_privileges(handle)) {
471 uvc_video_enable(video, 0);
472
473 mutex_lock(&video->queue.mutex);
474 if (uvc_free_buffers(&video->queue) < 0)
475 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
476 "free buffers.\n");
477 mutex_unlock(&video->queue.mutex);
478 }
479
480 /* Release the file handle. */
481 uvc_dismiss_privileges(handle);
482 kfree(handle);
483 file->private_data = NULL;
484
485 if (atomic_dec_return(&video->dev->users) == 0)
486 uvc_status_stop(video->dev);
487
488 usb_autopm_put_interface(video->dev->intf);
489 kref_put(&video->dev->kref, uvc_delete);
490 return 0;
491 }
492
493 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
494 {
495 struct video_device *vdev = video_devdata(file);
496 struct uvc_video_device *video = video_get_drvdata(vdev);
497 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
498 long ret = 0;
499
500 switch (cmd) {
501 /* Query capabilities */
502 case VIDIOC_QUERYCAP:
503 {
504 struct v4l2_capability *cap = arg;
505
506 memset(cap, 0, sizeof *cap);
507 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
508 strlcpy(cap->card, vdev->name, sizeof cap->card);
509 usb_make_path(video->dev->udev,
510 cap->bus_info, sizeof(cap->bus_info));
511 cap->version = DRIVER_VERSION_NUMBER;
512 if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
513 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
514 | V4L2_CAP_STREAMING;
515 else
516 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
517 | V4L2_CAP_STREAMING;
518 break;
519 }
520
521 /* Get, Set & Query control */
522 case VIDIOC_QUERYCTRL:
523 return uvc_query_v4l2_ctrl(video, arg);
524
525 case VIDIOC_G_CTRL:
526 {
527 struct v4l2_control *ctrl = arg;
528 struct v4l2_ext_control xctrl;
529
530 memset(&xctrl, 0, sizeof xctrl);
531 xctrl.id = ctrl->id;
532
533 ret = uvc_ctrl_begin(video);
534 if (ret < 0)
535 return ret;
536
537 ret = uvc_ctrl_get(video, &xctrl);
538 uvc_ctrl_rollback(video);
539 if (ret >= 0)
540 ctrl->value = xctrl.value;
541 break;
542 }
543
544 case VIDIOC_S_CTRL:
545 {
546 struct v4l2_control *ctrl = arg;
547 struct v4l2_ext_control xctrl;
548
549 memset(&xctrl, 0, sizeof xctrl);
550 xctrl.id = ctrl->id;
551 xctrl.value = ctrl->value;
552
553 ret = uvc_ctrl_begin(video);
554 if (ret < 0)
555 return ret;
556
557 ret = uvc_ctrl_set(video, &xctrl);
558 if (ret < 0) {
559 uvc_ctrl_rollback(video);
560 return ret;
561 }
562 ret = uvc_ctrl_commit(video);
563 break;
564 }
565
566 case VIDIOC_QUERYMENU:
567 return uvc_v4l2_query_menu(video, arg);
568
569 case VIDIOC_G_EXT_CTRLS:
570 {
571 struct v4l2_ext_controls *ctrls = arg;
572 struct v4l2_ext_control *ctrl = ctrls->controls;
573 unsigned int i;
574
575 ret = uvc_ctrl_begin(video);
576 if (ret < 0)
577 return ret;
578
579 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
580 ret = uvc_ctrl_get(video, ctrl);
581 if (ret < 0) {
582 uvc_ctrl_rollback(video);
583 ctrls->error_idx = i;
584 return ret;
585 }
586 }
587 ctrls->error_idx = 0;
588 ret = uvc_ctrl_rollback(video);
589 break;
590 }
591
592 case VIDIOC_S_EXT_CTRLS:
593 case VIDIOC_TRY_EXT_CTRLS:
594 {
595 struct v4l2_ext_controls *ctrls = arg;
596 struct v4l2_ext_control *ctrl = ctrls->controls;
597 unsigned int i;
598
599 ret = uvc_ctrl_begin(video);
600 if (ret < 0)
601 return ret;
602
603 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
604 ret = uvc_ctrl_set(video, ctrl);
605 if (ret < 0) {
606 uvc_ctrl_rollback(video);
607 ctrls->error_idx = i;
608 return ret;
609 }
610 }
611
612 ctrls->error_idx = 0;
613
614 if (cmd == VIDIOC_S_EXT_CTRLS)
615 ret = uvc_ctrl_commit(video);
616 else
617 ret = uvc_ctrl_rollback(video);
618 break;
619 }
620
621 /* Get, Set & Enum input */
622 case VIDIOC_ENUMINPUT:
623 {
624 const struct uvc_entity *selector = video->selector;
625 struct v4l2_input *input = arg;
626 struct uvc_entity *iterm = NULL;
627 u32 index = input->index;
628 int pin = 0;
629
630 if (selector == NULL ||
631 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
632 if (index != 0)
633 return -EINVAL;
634 iterm = list_first_entry(&video->iterms,
635 struct uvc_entity, chain);
636 pin = iterm->id;
637 } else if (pin < selector->selector.bNrInPins) {
638 pin = selector->selector.baSourceID[index];
639 list_for_each_entry(iterm, video->iterms.next, chain) {
640 if (iterm->id == pin)
641 break;
642 }
643 }
644
645 if (iterm == NULL || iterm->id != pin)
646 return -EINVAL;
647
648 memset(input, 0, sizeof *input);
649 input->index = index;
650 strlcpy(input->name, iterm->name, sizeof input->name);
651 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
652 input->type = V4L2_INPUT_TYPE_CAMERA;
653 break;
654 }
655
656 case VIDIOC_G_INPUT:
657 {
658 u8 input;
659
660 if (video->selector == NULL ||
661 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
662 *(int *)arg = 0;
663 break;
664 }
665
666 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
667 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
668 &input, 1);
669 if (ret < 0)
670 return ret;
671
672 *(int *)arg = input - 1;
673 break;
674 }
675
676 case VIDIOC_S_INPUT:
677 {
678 u32 input = *(u32 *)arg + 1;
679
680 if ((ret = uvc_acquire_privileges(handle)) < 0)
681 return ret;
682
683 if (video->selector == NULL ||
684 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
685 if (input != 1)
686 return -EINVAL;
687 break;
688 }
689
690 if (input == 0 || input > video->selector->selector.bNrInPins)
691 return -EINVAL;
692
693 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
694 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
695 &input, 1);
696 }
697
698 /* Try, Get, Set & Enum format */
699 case VIDIOC_ENUM_FMT:
700 {
701 struct v4l2_fmtdesc *fmt = arg;
702 struct uvc_format *format;
703 enum v4l2_buf_type type = fmt->type;
704 __u32 index = fmt->index;
705
706 if (fmt->type != video->streaming->type ||
707 fmt->index >= video->streaming->nformats)
708 return -EINVAL;
709
710 memset(fmt, 0, sizeof(*fmt));
711 fmt->index = index;
712 fmt->type = type;
713
714 format = &video->streaming->format[fmt->index];
715 fmt->flags = 0;
716 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
717 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
718 strlcpy(fmt->description, format->name,
719 sizeof fmt->description);
720 fmt->description[sizeof fmt->description - 1] = 0;
721 fmt->pixelformat = format->fcc;
722 break;
723 }
724
725 case VIDIOC_TRY_FMT:
726 {
727 struct uvc_streaming_control probe;
728
729 if ((ret = uvc_acquire_privileges(handle)) < 0)
730 return ret;
731
732 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
733 }
734
735 case VIDIOC_S_FMT:
736 if ((ret = uvc_acquire_privileges(handle)) < 0)
737 return ret;
738
739 return uvc_v4l2_set_format(video, arg);
740
741 case VIDIOC_G_FMT:
742 return uvc_v4l2_get_format(video, arg);
743
744 /* Frame size enumeration */
745 case VIDIOC_ENUM_FRAMESIZES:
746 {
747 struct v4l2_frmsizeenum *fsize = arg;
748 struct uvc_format *format = NULL;
749 struct uvc_frame *frame;
750 int i;
751
752 /* Look for the given pixel format */
753 for (i = 0; i < video->streaming->nformats; i++) {
754 if (video->streaming->format[i].fcc ==
755 fsize->pixel_format) {
756 format = &video->streaming->format[i];
757 break;
758 }
759 }
760 if (format == NULL)
761 return -EINVAL;
762
763 if (fsize->index >= format->nframes)
764 return -EINVAL;
765
766 frame = &format->frame[fsize->index];
767 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
768 fsize->discrete.width = frame->wWidth;
769 fsize->discrete.height = frame->wHeight;
770 break;
771 }
772
773 /* Frame interval enumeration */
774 case VIDIOC_ENUM_FRAMEINTERVALS:
775 {
776 struct v4l2_frmivalenum *fival = arg;
777 struct uvc_format *format = NULL;
778 struct uvc_frame *frame = NULL;
779 int i;
780
781 /* Look for the given pixel format and frame size */
782 for (i = 0; i < video->streaming->nformats; i++) {
783 if (video->streaming->format[i].fcc ==
784 fival->pixel_format) {
785 format = &video->streaming->format[i];
786 break;
787 }
788 }
789 if (format == NULL)
790 return -EINVAL;
791
792 for (i = 0; i < format->nframes; i++) {
793 if (format->frame[i].wWidth == fival->width &&
794 format->frame[i].wHeight == fival->height) {
795 frame = &format->frame[i];
796 break;
797 }
798 }
799 if (frame == NULL)
800 return -EINVAL;
801
802 if (frame->bFrameIntervalType) {
803 if (fival->index >= frame->bFrameIntervalType)
804 return -EINVAL;
805
806 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
807 fival->discrete.numerator =
808 frame->dwFrameInterval[fival->index];
809 fival->discrete.denominator = 10000000;
810 uvc_simplify_fraction(&fival->discrete.numerator,
811 &fival->discrete.denominator, 8, 333);
812 } else {
813 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
814 fival->stepwise.min.numerator =
815 frame->dwFrameInterval[0];
816 fival->stepwise.min.denominator = 10000000;
817 fival->stepwise.max.numerator =
818 frame->dwFrameInterval[1];
819 fival->stepwise.max.denominator = 10000000;
820 fival->stepwise.step.numerator =
821 frame->dwFrameInterval[2];
822 fival->stepwise.step.denominator = 10000000;
823 uvc_simplify_fraction(&fival->stepwise.min.numerator,
824 &fival->stepwise.min.denominator, 8, 333);
825 uvc_simplify_fraction(&fival->stepwise.max.numerator,
826 &fival->stepwise.max.denominator, 8, 333);
827 uvc_simplify_fraction(&fival->stepwise.step.numerator,
828 &fival->stepwise.step.denominator, 8, 333);
829 }
830 break;
831 }
832
833 /* Get & Set streaming parameters */
834 case VIDIOC_G_PARM:
835 return uvc_v4l2_get_streamparm(video, arg);
836
837 case VIDIOC_S_PARM:
838 if ((ret = uvc_acquire_privileges(handle)) < 0)
839 return ret;
840
841 return uvc_v4l2_set_streamparm(video, arg);
842
843 /* Cropping and scaling */
844 case VIDIOC_CROPCAP:
845 {
846 struct v4l2_cropcap *ccap = arg;
847 struct uvc_frame *frame = video->streaming->cur_frame;
848
849 if (ccap->type != video->streaming->type)
850 return -EINVAL;
851
852 ccap->bounds.left = 0;
853 ccap->bounds.top = 0;
854 ccap->bounds.width = frame->wWidth;
855 ccap->bounds.height = frame->wHeight;
856
857 ccap->defrect = ccap->bounds;
858
859 ccap->pixelaspect.numerator = 1;
860 ccap->pixelaspect.denominator = 1;
861 break;
862 }
863
864 case VIDIOC_G_CROP:
865 case VIDIOC_S_CROP:
866 return -EINVAL;
867
868 /* Buffers & streaming */
869 case VIDIOC_REQBUFS:
870 {
871 struct v4l2_requestbuffers *rb = arg;
872 unsigned int bufsize =
873 video->streaming->ctrl.dwMaxVideoFrameSize;
874
875 if (rb->type != video->streaming->type ||
876 rb->memory != V4L2_MEMORY_MMAP)
877 return -EINVAL;
878
879 if ((ret = uvc_acquire_privileges(handle)) < 0)
880 return ret;
881
882 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
883 if (ret < 0)
884 return ret;
885
886 rb->count = ret;
887 ret = 0;
888 break;
889 }
890
891 case VIDIOC_QUERYBUF:
892 {
893 struct v4l2_buffer *buf = arg;
894
895 if (buf->type != video->streaming->type)
896 return -EINVAL;
897
898 if (!uvc_has_privileges(handle))
899 return -EBUSY;
900
901 return uvc_query_buffer(&video->queue, buf);
902 }
903
904 case VIDIOC_QBUF:
905 if (!uvc_has_privileges(handle))
906 return -EBUSY;
907
908 return uvc_queue_buffer(&video->queue, arg);
909
910 case VIDIOC_DQBUF:
911 if (!uvc_has_privileges(handle))
912 return -EBUSY;
913
914 return uvc_dequeue_buffer(&video->queue, arg,
915 file->f_flags & O_NONBLOCK);
916
917 case VIDIOC_STREAMON:
918 {
919 int *type = arg;
920
921 if (*type != video->streaming->type)
922 return -EINVAL;
923
924 if (!uvc_has_privileges(handle))
925 return -EBUSY;
926
927 if ((ret = uvc_video_enable(video, 1)) < 0)
928 return ret;
929 break;
930 }
931
932 case VIDIOC_STREAMOFF:
933 {
934 int *type = arg;
935
936 if (*type != video->streaming->type)
937 return -EINVAL;
938
939 if (!uvc_has_privileges(handle))
940 return -EBUSY;
941
942 return uvc_video_enable(video, 0);
943 }
944
945 /* Analog video standards make no sense for digital cameras. */
946 case VIDIOC_ENUMSTD:
947 case VIDIOC_QUERYSTD:
948 case VIDIOC_G_STD:
949 case VIDIOC_S_STD:
950
951 case VIDIOC_OVERLAY:
952
953 case VIDIOC_ENUMAUDIO:
954 case VIDIOC_ENUMAUDOUT:
955
956 case VIDIOC_ENUMOUTPUT:
957 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
958 return -EINVAL;
959
960 /* Dynamic controls. */
961 case UVCIOC_CTRL_ADD:
962 {
963 struct uvc_xu_control_info *xinfo = arg;
964 struct uvc_control_info *info;
965
966 if (!capable(CAP_SYS_ADMIN))
967 return -EPERM;
968
969 info = kzalloc(sizeof *info, GFP_KERNEL);
970 if (info == NULL)
971 return -ENOMEM;
972
973 memcpy(info->entity, xinfo->entity, sizeof info->entity);
974 info->index = xinfo->index;
975 info->selector = xinfo->selector;
976 info->size = xinfo->size;
977 info->flags = xinfo->flags;
978
979 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
980 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
981
982 ret = uvc_ctrl_add_info(info);
983 if (ret < 0)
984 kfree(info);
985 break;
986 }
987
988 case UVCIOC_CTRL_MAP:
989 {
990 struct uvc_xu_control_mapping *xmap = arg;
991 struct uvc_control_mapping *map;
992
993 if (!capable(CAP_SYS_ADMIN))
994 return -EPERM;
995
996 map = kzalloc(sizeof *map, GFP_KERNEL);
997 if (map == NULL)
998 return -ENOMEM;
999
1000 map->id = xmap->id;
1001 memcpy(map->name, xmap->name, sizeof map->name);
1002 memcpy(map->entity, xmap->entity, sizeof map->entity);
1003 map->selector = xmap->selector;
1004 map->size = xmap->size;
1005 map->offset = xmap->offset;
1006 map->v4l2_type = xmap->v4l2_type;
1007 map->data_type = xmap->data_type;
1008
1009 ret = uvc_ctrl_add_mapping(map);
1010 if (ret < 0)
1011 kfree(map);
1012 break;
1013 }
1014
1015 case UVCIOC_CTRL_GET:
1016 return uvc_xu_ctrl_query(video, arg, 0);
1017
1018 case UVCIOC_CTRL_SET:
1019 return uvc_xu_ctrl_query(video, arg, 1);
1020
1021 default:
1022 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1023 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1024 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1025 cmd);
1026 return ret;
1027 }
1028
1029 return ret;
1030 }
1031
1032 static long uvc_v4l2_ioctl(struct file *file,
1033 unsigned int cmd, unsigned long arg)
1034 {
1035 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1036 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1037 v4l_printk_ioctl(cmd);
1038 printk(")\n");
1039 }
1040
1041 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1042 }
1043
1044 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1045 size_t count, loff_t *ppos)
1046 {
1047 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1048 return -ENODEV;
1049 }
1050
1051 /*
1052 * VMA operations.
1053 */
1054 static void uvc_vm_open(struct vm_area_struct *vma)
1055 {
1056 struct uvc_buffer *buffer = vma->vm_private_data;
1057 buffer->vma_use_count++;
1058 }
1059
1060 static void uvc_vm_close(struct vm_area_struct *vma)
1061 {
1062 struct uvc_buffer *buffer = vma->vm_private_data;
1063 buffer->vma_use_count--;
1064 }
1065
1066 static struct vm_operations_struct uvc_vm_ops = {
1067 .open = uvc_vm_open,
1068 .close = uvc_vm_close,
1069 };
1070
1071 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1072 {
1073 struct uvc_video_device *video = video_drvdata(file);
1074 struct uvc_buffer *uninitialized_var(buffer);
1075 struct page *page;
1076 unsigned long addr, start, size;
1077 unsigned int i;
1078 int ret = 0;
1079
1080 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1081
1082 start = vma->vm_start;
1083 size = vma->vm_end - vma->vm_start;
1084
1085 mutex_lock(&video->queue.mutex);
1086
1087 for (i = 0; i < video->queue.count; ++i) {
1088 buffer = &video->queue.buffer[i];
1089 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1090 break;
1091 }
1092
1093 if (i == video->queue.count || size != video->queue.buf_size) {
1094 ret = -EINVAL;
1095 goto done;
1096 }
1097
1098 /*
1099 * VM_IO marks the area as being an mmaped region for I/O to a
1100 * device. It also prevents the region from being core dumped.
1101 */
1102 vma->vm_flags |= VM_IO;
1103
1104 addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1105 while (size > 0) {
1106 page = vmalloc_to_page((void *)addr);
1107 if ((ret = vm_insert_page(vma, start, page)) < 0)
1108 goto done;
1109
1110 start += PAGE_SIZE;
1111 addr += PAGE_SIZE;
1112 size -= PAGE_SIZE;
1113 }
1114
1115 vma->vm_ops = &uvc_vm_ops;
1116 vma->vm_private_data = buffer;
1117 uvc_vm_open(vma);
1118
1119 done:
1120 mutex_unlock(&video->queue.mutex);
1121 return ret;
1122 }
1123
1124 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1125 {
1126 struct uvc_video_device *video = video_drvdata(file);
1127
1128 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1129
1130 return uvc_queue_poll(&video->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
1143
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