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V4L/DVB (10135): v4l2: introduce v4l2_file_operations.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / uvc / uvc_v4l2.c
1 /*
2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
3 *
4 * Copyright (C) 2005-2008
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 which 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
50 ctrl = uvc_find_control(video, query_menu->id, &mapping);
51 if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
52 return -EINVAL;
53
54 if (query_menu->index >= mapping->menu_count)
55 return -EINVAL;
56
57 menu_info = &mapping->menu_info[query_menu->index];
58 strncpy(query_menu->name, menu_info->name, 32);
59 return 0;
60 }
61
62 /*
63 * Find the frame interval closest to the requested frame interval for the
64 * given frame format and size. This should be done by the device as part of
65 * the Video Probe and Commit negotiation, but some hardware don't implement
66 * that feature.
67 */
68 static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
69 {
70 unsigned int i;
71
72 if (frame->bFrameIntervalType) {
73 __u32 best = -1, dist;
74
75 for (i = 0; i < frame->bFrameIntervalType; ++i) {
76 dist = interval > frame->dwFrameInterval[i]
77 ? interval - frame->dwFrameInterval[i]
78 : frame->dwFrameInterval[i] - interval;
79
80 if (dist > best)
81 break;
82
83 best = dist;
84 }
85
86 interval = frame->dwFrameInterval[i-1];
87 } else {
88 const __u32 min = frame->dwFrameInterval[0];
89 const __u32 max = frame->dwFrameInterval[1];
90 const __u32 step = frame->dwFrameInterval[2];
91
92 interval = min + (interval - min + step/2) / step * step;
93 if (interval > max)
94 interval = max;
95 }
96
97 return interval;
98 }
99
100 static int uvc_v4l2_try_format(struct uvc_video_device *video,
101 struct v4l2_format *fmt, struct uvc_streaming_control *probe,
102 struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
103 {
104 struct uvc_format *format = NULL;
105 struct uvc_frame *frame = NULL;
106 __u16 rw, rh;
107 unsigned int d, maxd;
108 unsigned int i;
109 __u32 interval;
110 int ret = 0;
111 __u8 *fcc;
112
113 if (fmt->type != video->streaming->type)
114 return -EINVAL;
115
116 fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
117 uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
118 fmt->fmt.pix.pixelformat,
119 fcc[0], fcc[1], fcc[2], fcc[3],
120 fmt->fmt.pix.width, fmt->fmt.pix.height);
121
122 /* Check if the hardware supports the requested format. */
123 for (i = 0; i < video->streaming->nformats; ++i) {
124 format = &video->streaming->format[i];
125 if (format->fcc == fmt->fmt.pix.pixelformat)
126 break;
127 }
128
129 if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
130 uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
131 fmt->fmt.pix.pixelformat);
132 return -EINVAL;
133 }
134
135 /* Find the closest image size. The distance between image sizes is
136 * the size in pixels of the non-overlapping regions between the
137 * requested size and the frame-specified size.
138 */
139 rw = fmt->fmt.pix.width;
140 rh = fmt->fmt.pix.height;
141 maxd = (unsigned int)-1;
142
143 for (i = 0; i < format->nframes; ++i) {
144 __u16 w = format->frame[i].wWidth;
145 __u16 h = format->frame[i].wHeight;
146
147 d = min(w, rw) * min(h, rh);
148 d = w*h + rw*rh - 2*d;
149 if (d < maxd) {
150 maxd = d;
151 frame = &format->frame[i];
152 }
153
154 if (maxd == 0)
155 break;
156 }
157
158 if (frame == NULL) {
159 uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
160 fmt->fmt.pix.width, fmt->fmt.pix.height);
161 return -EINVAL;
162 }
163
164 /* Use the default frame interval. */
165 interval = frame->dwDefaultFrameInterval;
166 uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
167 "(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
168 (100000000/interval)%10);
169
170 /* Set the format index, frame index and frame interval. */
171 memset(probe, 0, sizeof *probe);
172 probe->bmHint = 1; /* dwFrameInterval */
173 probe->bFormatIndex = format->index;
174 probe->bFrameIndex = frame->bFrameIndex;
175 probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
176 /* Some webcams stall the probe control set request when the
177 * dwMaxVideoFrameSize field is set to zero. The UVC specification
178 * clearly states that the field is read-only from the host, so this
179 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
180 * the webcam to work around the problem.
181 *
182 * The workaround could probably be enabled for all webcams, so the
183 * quirk can be removed if needed. It's currently useful to detect
184 * webcam bugs and fix them before they hit the market (providing
185 * developers test their webcams with the Linux driver as well as with
186 * the Windows driver).
187 */
188 if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
189 probe->dwMaxVideoFrameSize =
190 video->streaming->ctrl.dwMaxVideoFrameSize;
191
192 /* Probe the device */
193 if ((ret = uvc_probe_video(video, probe)) < 0)
194 goto done;
195
196 fmt->fmt.pix.width = frame->wWidth;
197 fmt->fmt.pix.height = frame->wHeight;
198 fmt->fmt.pix.field = V4L2_FIELD_NONE;
199 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
200 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
201 fmt->fmt.pix.colorspace = format->colorspace;
202 fmt->fmt.pix.priv = 0;
203
204 if (uvc_format != NULL)
205 *uvc_format = format;
206 if (uvc_frame != NULL)
207 *uvc_frame = frame;
208
209 done:
210 return ret;
211 }
212
213 static int uvc_v4l2_get_format(struct uvc_video_device *video,
214 struct v4l2_format *fmt)
215 {
216 struct uvc_format *format = video->streaming->cur_format;
217 struct uvc_frame *frame = video->streaming->cur_frame;
218
219 if (fmt->type != video->streaming->type)
220 return -EINVAL;
221
222 if (format == NULL || frame == NULL)
223 return -EINVAL;
224
225 fmt->fmt.pix.pixelformat = format->fcc;
226 fmt->fmt.pix.width = frame->wWidth;
227 fmt->fmt.pix.height = frame->wHeight;
228 fmt->fmt.pix.field = V4L2_FIELD_NONE;
229 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
230 fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
231 fmt->fmt.pix.colorspace = format->colorspace;
232 fmt->fmt.pix.priv = 0;
233
234 return 0;
235 }
236
237 static int uvc_v4l2_set_format(struct uvc_video_device *video,
238 struct v4l2_format *fmt)
239 {
240 struct uvc_streaming_control probe;
241 struct uvc_format *format;
242 struct uvc_frame *frame;
243 int ret;
244
245 if (fmt->type != video->streaming->type)
246 return -EINVAL;
247
248 if (uvc_queue_streaming(&video->queue))
249 return -EBUSY;
250
251 ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
252 if (ret < 0)
253 return ret;
254
255 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
256 video->streaming->cur_format = format;
257 video->streaming->cur_frame = frame;
258
259 return 0;
260 }
261
262 static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
263 struct v4l2_streamparm *parm)
264 {
265 uint32_t numerator, denominator;
266
267 if (parm->type != video->streaming->type)
268 return -EINVAL;
269
270 numerator = video->streaming->ctrl.dwFrameInterval;
271 denominator = 10000000;
272 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
273
274 memset(parm, 0, sizeof *parm);
275 parm->type = video->streaming->type;
276
277 if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
278 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
279 parm->parm.capture.capturemode = 0;
280 parm->parm.capture.timeperframe.numerator = numerator;
281 parm->parm.capture.timeperframe.denominator = denominator;
282 parm->parm.capture.extendedmode = 0;
283 parm->parm.capture.readbuffers = 0;
284 } else {
285 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
286 parm->parm.output.outputmode = 0;
287 parm->parm.output.timeperframe.numerator = numerator;
288 parm->parm.output.timeperframe.denominator = denominator;
289 }
290
291 return 0;
292 }
293
294 static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
295 struct v4l2_streamparm *parm)
296 {
297 struct uvc_frame *frame = video->streaming->cur_frame;
298 struct uvc_streaming_control probe;
299 struct v4l2_fract timeperframe;
300 uint32_t interval;
301 int ret;
302
303 if (parm->type != video->streaming->type)
304 return -EINVAL;
305
306 if (uvc_queue_streaming(&video->queue))
307 return -EBUSY;
308
309 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
310 timeperframe = parm->parm.capture.timeperframe;
311 else
312 timeperframe = parm->parm.output.timeperframe;
313
314 memcpy(&probe, &video->streaming->ctrl, sizeof probe);
315 interval = uvc_fraction_to_interval(timeperframe.numerator,
316 timeperframe.denominator);
317
318 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
319 timeperframe.numerator, timeperframe.denominator, interval);
320 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
321
322 /* Probe the device with the new settings. */
323 if ((ret = uvc_probe_video(video, &probe)) < 0)
324 return ret;
325
326 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
327
328 /* Return the actual frame period. */
329 timeperframe.numerator = probe.dwFrameInterval;
330 timeperframe.denominator = 10000000;
331 uvc_simplify_fraction(&timeperframe.numerator,
332 &timeperframe.denominator, 8, 333);
333
334 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
335 parm->parm.capture.timeperframe = timeperframe;
336 else
337 parm->parm.output.timeperframe = timeperframe;
338
339 return 0;
340 }
341
342 /* ------------------------------------------------------------------------
343 * Privilege management
344 */
345
346 /*
347 * Privilege management is the multiple-open implementation basis. The current
348 * implementation is completely transparent for the end-user and doesn't
349 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
350 * Those ioctls enable finer control on the device (by making possible for a
351 * user to request exclusive access to a device), but are not mature yet.
352 * Switching to the V4L2 priority mechanism might be considered in the future
353 * if this situation changes.
354 *
355 * Each open instance of a UVC device can either be in a privileged or
356 * unprivileged state. Only a single instance can be in a privileged state at
357 * a given time. Trying to perform an operation which requires privileges will
358 * automatically acquire the required privileges if possible, or return -EBUSY
359 * otherwise. Privileges are dismissed when closing the instance.
360 *
361 * Operations which require privileges are:
362 *
363 * - VIDIOC_S_INPUT
364 * - VIDIOC_S_PARM
365 * - VIDIOC_S_FMT
366 * - VIDIOC_TRY_FMT
367 * - VIDIOC_REQBUFS
368 */
369 static int uvc_acquire_privileges(struct uvc_fh *handle)
370 {
371 int ret = 0;
372
373 /* Always succeed if the handle is already privileged. */
374 if (handle->state == UVC_HANDLE_ACTIVE)
375 return 0;
376
377 /* Check if the device already has a privileged handle. */
378 mutex_lock(&uvc_driver.open_mutex);
379 if (atomic_inc_return(&handle->device->active) != 1) {
380 atomic_dec(&handle->device->active);
381 ret = -EBUSY;
382 goto done;
383 }
384
385 handle->state = UVC_HANDLE_ACTIVE;
386
387 done:
388 mutex_unlock(&uvc_driver.open_mutex);
389 return ret;
390 }
391
392 static void uvc_dismiss_privileges(struct uvc_fh *handle)
393 {
394 if (handle->state == UVC_HANDLE_ACTIVE)
395 atomic_dec(&handle->device->active);
396
397 handle->state = UVC_HANDLE_PASSIVE;
398 }
399
400 static int uvc_has_privileges(struct uvc_fh *handle)
401 {
402 return handle->state == UVC_HANDLE_ACTIVE;
403 }
404
405 /* ------------------------------------------------------------------------
406 * V4L2 file operations
407 */
408
409 static int uvc_v4l2_open(struct file *file)
410 {
411 struct uvc_video_device *video;
412 struct uvc_fh *handle;
413 int ret = 0;
414
415 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
416 mutex_lock(&uvc_driver.open_mutex);
417 video = video_drvdata(file);
418
419 if (video->dev->state & UVC_DEV_DISCONNECTED) {
420 ret = -ENODEV;
421 goto done;
422 }
423
424 ret = usb_autopm_get_interface(video->dev->intf);
425 if (ret < 0)
426 goto done;
427
428 /* Create the device handle. */
429 handle = kzalloc(sizeof *handle, GFP_KERNEL);
430 if (handle == NULL) {
431 usb_autopm_put_interface(video->dev->intf);
432 ret = -ENOMEM;
433 goto done;
434 }
435
436 handle->device = video;
437 handle->state = UVC_HANDLE_PASSIVE;
438 file->private_data = handle;
439
440 kref_get(&video->dev->kref);
441
442 done:
443 mutex_unlock(&uvc_driver.open_mutex);
444 return ret;
445 }
446
447 static int uvc_v4l2_release(struct file *file)
448 {
449 struct uvc_video_device *video = video_drvdata(file);
450 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
451
452 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
453
454 /* Only free resources if this is a privileged handle. */
455 if (uvc_has_privileges(handle)) {
456 uvc_video_enable(video, 0);
457
458 mutex_lock(&video->queue.mutex);
459 if (uvc_free_buffers(&video->queue) < 0)
460 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
461 "free buffers.\n");
462 mutex_unlock(&video->queue.mutex);
463 }
464
465 /* Release the file handle. */
466 uvc_dismiss_privileges(handle);
467 kfree(handle);
468 file->private_data = NULL;
469
470 usb_autopm_put_interface(video->dev->intf);
471 kref_put(&video->dev->kref, uvc_delete);
472 return 0;
473 }
474
475 static int uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
476 {
477 struct video_device *vdev = video_devdata(file);
478 struct uvc_video_device *video = video_get_drvdata(vdev);
479 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
480 int ret = 0;
481
482 switch (cmd) {
483 /* Query capabilities */
484 case VIDIOC_QUERYCAP:
485 {
486 struct v4l2_capability *cap = arg;
487
488 memset(cap, 0, sizeof *cap);
489 strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
490 strncpy(cap->card, vdev->name, 32);
491 strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
492 sizeof cap->bus_info);
493 cap->version = DRIVER_VERSION_NUMBER;
494 if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
495 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
496 | V4L2_CAP_STREAMING;
497 else
498 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
499 | V4L2_CAP_STREAMING;
500 break;
501 }
502
503 /* Get, Set & Query control */
504 case VIDIOC_QUERYCTRL:
505 return uvc_query_v4l2_ctrl(video, arg);
506
507 case VIDIOC_G_CTRL:
508 {
509 struct v4l2_control *ctrl = arg;
510 struct v4l2_ext_control xctrl;
511
512 memset(&xctrl, 0, sizeof xctrl);
513 xctrl.id = ctrl->id;
514
515 uvc_ctrl_begin(video);
516 ret = uvc_ctrl_get(video, &xctrl);
517 uvc_ctrl_rollback(video);
518 if (ret >= 0)
519 ctrl->value = xctrl.value;
520 break;
521 }
522
523 case VIDIOC_S_CTRL:
524 {
525 struct v4l2_control *ctrl = arg;
526 struct v4l2_ext_control xctrl;
527
528 memset(&xctrl, 0, sizeof xctrl);
529 xctrl.id = ctrl->id;
530 xctrl.value = ctrl->value;
531
532 uvc_ctrl_begin(video);
533 ret = uvc_ctrl_set(video, &xctrl);
534 if (ret < 0) {
535 uvc_ctrl_rollback(video);
536 return ret;
537 }
538 ret = uvc_ctrl_commit(video);
539 break;
540 }
541
542 case VIDIOC_QUERYMENU:
543 return uvc_v4l2_query_menu(video, arg);
544
545 case VIDIOC_G_EXT_CTRLS:
546 {
547 struct v4l2_ext_controls *ctrls = arg;
548 struct v4l2_ext_control *ctrl = ctrls->controls;
549 unsigned int i;
550
551 uvc_ctrl_begin(video);
552 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
553 ret = uvc_ctrl_get(video, ctrl);
554 if (ret < 0) {
555 uvc_ctrl_rollback(video);
556 ctrls->error_idx = i;
557 return ret;
558 }
559 }
560 ctrls->error_idx = 0;
561 ret = uvc_ctrl_rollback(video);
562 break;
563 }
564
565 case VIDIOC_S_EXT_CTRLS:
566 case VIDIOC_TRY_EXT_CTRLS:
567 {
568 struct v4l2_ext_controls *ctrls = arg;
569 struct v4l2_ext_control *ctrl = ctrls->controls;
570 unsigned int i;
571
572 ret = uvc_ctrl_begin(video);
573 if (ret < 0)
574 return ret;
575
576 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
577 ret = uvc_ctrl_set(video, ctrl);
578 if (ret < 0) {
579 uvc_ctrl_rollback(video);
580 ctrls->error_idx = i;
581 return ret;
582 }
583 }
584
585 ctrls->error_idx = 0;
586
587 if (cmd == VIDIOC_S_EXT_CTRLS)
588 ret = uvc_ctrl_commit(video);
589 else
590 ret = uvc_ctrl_rollback(video);
591 break;
592 }
593
594 /* Get, Set & Enum input */
595 case VIDIOC_ENUMINPUT:
596 {
597 const struct uvc_entity *selector = video->selector;
598 struct v4l2_input *input = arg;
599 struct uvc_entity *iterm = NULL;
600 u32 index = input->index;
601 int pin = 0;
602
603 if (selector == NULL ||
604 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
605 if (index != 0)
606 return -EINVAL;
607 iterm = list_first_entry(&video->iterms,
608 struct uvc_entity, chain);
609 pin = iterm->id;
610 } else if (pin < selector->selector.bNrInPins) {
611 pin = selector->selector.baSourceID[index];
612 list_for_each_entry(iterm, video->iterms.next, chain) {
613 if (iterm->id == pin)
614 break;
615 }
616 }
617
618 if (iterm == NULL || iterm->id != pin)
619 return -EINVAL;
620
621 memset(input, 0, sizeof *input);
622 input->index = index;
623 strncpy(input->name, iterm->name, sizeof input->name);
624 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
625 input->type = V4L2_INPUT_TYPE_CAMERA;
626 break;
627 }
628
629 case VIDIOC_G_INPUT:
630 {
631 u8 input;
632
633 if (video->selector == NULL ||
634 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
635 *(int *)arg = 0;
636 break;
637 }
638
639 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
640 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
641 &input, 1);
642 if (ret < 0)
643 return ret;
644
645 *(int *)arg = input - 1;
646 break;
647 }
648
649 case VIDIOC_S_INPUT:
650 {
651 u8 input = *(u32 *)arg + 1;
652
653 if ((ret = uvc_acquire_privileges(handle)) < 0)
654 return ret;
655
656 if (video->selector == NULL ||
657 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
658 if (input != 1)
659 return -EINVAL;
660 break;
661 }
662
663 if (input > video->selector->selector.bNrInPins)
664 return -EINVAL;
665
666 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
667 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
668 &input, 1);
669 }
670
671 /* Try, Get, Set & Enum format */
672 case VIDIOC_ENUM_FMT:
673 {
674 struct v4l2_fmtdesc *fmt = arg;
675 struct uvc_format *format;
676
677 if (fmt->type != video->streaming->type ||
678 fmt->index >= video->streaming->nformats)
679 return -EINVAL;
680
681 format = &video->streaming->format[fmt->index];
682 fmt->flags = 0;
683 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
684 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
685 strncpy(fmt->description, format->name,
686 sizeof fmt->description);
687 fmt->description[sizeof fmt->description - 1] = 0;
688 fmt->pixelformat = format->fcc;
689 break;
690 }
691
692 case VIDIOC_TRY_FMT:
693 {
694 struct uvc_streaming_control probe;
695
696 if ((ret = uvc_acquire_privileges(handle)) < 0)
697 return ret;
698
699 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
700 }
701
702 case VIDIOC_S_FMT:
703 if ((ret = uvc_acquire_privileges(handle)) < 0)
704 return ret;
705
706 return uvc_v4l2_set_format(video, arg);
707
708 case VIDIOC_G_FMT:
709 return uvc_v4l2_get_format(video, arg);
710
711 /* Frame size enumeration */
712 case VIDIOC_ENUM_FRAMESIZES:
713 {
714 struct v4l2_frmsizeenum *fsize = arg;
715 struct uvc_format *format = NULL;
716 struct uvc_frame *frame;
717 int i;
718
719 /* Look for the given pixel format */
720 for (i = 0; i < video->streaming->nformats; i++) {
721 if (video->streaming->format[i].fcc ==
722 fsize->pixel_format) {
723 format = &video->streaming->format[i];
724 break;
725 }
726 }
727 if (format == NULL)
728 return -EINVAL;
729
730 if (fsize->index >= format->nframes)
731 return -EINVAL;
732
733 frame = &format->frame[fsize->index];
734 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
735 fsize->discrete.width = frame->wWidth;
736 fsize->discrete.height = frame->wHeight;
737 break;
738 }
739
740 /* Frame interval enumeration */
741 case VIDIOC_ENUM_FRAMEINTERVALS:
742 {
743 struct v4l2_frmivalenum *fival = arg;
744 struct uvc_format *format = NULL;
745 struct uvc_frame *frame = NULL;
746 int i;
747
748 /* Look for the given pixel format and frame size */
749 for (i = 0; i < video->streaming->nformats; i++) {
750 if (video->streaming->format[i].fcc ==
751 fival->pixel_format) {
752 format = &video->streaming->format[i];
753 break;
754 }
755 }
756 if (format == NULL)
757 return -EINVAL;
758
759 for (i = 0; i < format->nframes; i++) {
760 if (format->frame[i].wWidth == fival->width &&
761 format->frame[i].wHeight == fival->height) {
762 frame = &format->frame[i];
763 break;
764 }
765 }
766 if (frame == NULL)
767 return -EINVAL;
768
769 if (frame->bFrameIntervalType) {
770 if (fival->index >= frame->bFrameIntervalType)
771 return -EINVAL;
772
773 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
774 fival->discrete.numerator =
775 frame->dwFrameInterval[fival->index];
776 fival->discrete.denominator = 10000000;
777 uvc_simplify_fraction(&fival->discrete.numerator,
778 &fival->discrete.denominator, 8, 333);
779 } else {
780 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
781 fival->stepwise.min.numerator =
782 frame->dwFrameInterval[0];
783 fival->stepwise.min.denominator = 10000000;
784 fival->stepwise.max.numerator =
785 frame->dwFrameInterval[1];
786 fival->stepwise.max.denominator = 10000000;
787 fival->stepwise.step.numerator =
788 frame->dwFrameInterval[2];
789 fival->stepwise.step.denominator = 10000000;
790 uvc_simplify_fraction(&fival->stepwise.min.numerator,
791 &fival->stepwise.min.denominator, 8, 333);
792 uvc_simplify_fraction(&fival->stepwise.max.numerator,
793 &fival->stepwise.max.denominator, 8, 333);
794 uvc_simplify_fraction(&fival->stepwise.step.numerator,
795 &fival->stepwise.step.denominator, 8, 333);
796 }
797 break;
798 }
799
800 /* Get & Set streaming parameters */
801 case VIDIOC_G_PARM:
802 return uvc_v4l2_get_streamparm(video, arg);
803
804 case VIDIOC_S_PARM:
805 if ((ret = uvc_acquire_privileges(handle)) < 0)
806 return ret;
807
808 return uvc_v4l2_set_streamparm(video, arg);
809
810 /* Cropping and scaling */
811 case VIDIOC_CROPCAP:
812 {
813 struct v4l2_cropcap *ccap = arg;
814 struct uvc_frame *frame = video->streaming->cur_frame;
815
816 if (ccap->type != video->streaming->type)
817 return -EINVAL;
818
819 ccap->bounds.left = 0;
820 ccap->bounds.top = 0;
821 ccap->bounds.width = frame->wWidth;
822 ccap->bounds.height = frame->wHeight;
823
824 ccap->defrect = ccap->bounds;
825
826 ccap->pixelaspect.numerator = 1;
827 ccap->pixelaspect.denominator = 1;
828 break;
829 }
830
831 case VIDIOC_G_CROP:
832 case VIDIOC_S_CROP:
833 return -EINVAL;
834
835 /* Buffers & streaming */
836 case VIDIOC_REQBUFS:
837 {
838 struct v4l2_requestbuffers *rb = arg;
839 unsigned int bufsize =
840 video->streaming->ctrl.dwMaxVideoFrameSize;
841
842 if (rb->type != video->streaming->type ||
843 rb->memory != V4L2_MEMORY_MMAP)
844 return -EINVAL;
845
846 if ((ret = uvc_acquire_privileges(handle)) < 0)
847 return ret;
848
849 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
850 if (ret < 0)
851 return ret;
852
853 rb->count = ret;
854 ret = 0;
855 break;
856 }
857
858 case VIDIOC_QUERYBUF:
859 {
860 struct v4l2_buffer *buf = arg;
861
862 if (buf->type != video->streaming->type)
863 return -EINVAL;
864
865 if (!uvc_has_privileges(handle))
866 return -EBUSY;
867
868 return uvc_query_buffer(&video->queue, buf);
869 }
870
871 case VIDIOC_QBUF:
872 if (!uvc_has_privileges(handle))
873 return -EBUSY;
874
875 return uvc_queue_buffer(&video->queue, arg);
876
877 case VIDIOC_DQBUF:
878 if (!uvc_has_privileges(handle))
879 return -EBUSY;
880
881 return uvc_dequeue_buffer(&video->queue, arg,
882 file->f_flags & O_NONBLOCK);
883
884 case VIDIOC_STREAMON:
885 {
886 int *type = arg;
887
888 if (*type != video->streaming->type)
889 return -EINVAL;
890
891 if (!uvc_has_privileges(handle))
892 return -EBUSY;
893
894 if ((ret = uvc_video_enable(video, 1)) < 0)
895 return ret;
896 break;
897 }
898
899 case VIDIOC_STREAMOFF:
900 {
901 int *type = arg;
902
903 if (*type != video->streaming->type)
904 return -EINVAL;
905
906 if (!uvc_has_privileges(handle))
907 return -EBUSY;
908
909 return uvc_video_enable(video, 0);
910 }
911
912 /* Analog video standards make no sense for digital cameras. */
913 case VIDIOC_ENUMSTD:
914 case VIDIOC_QUERYSTD:
915 case VIDIOC_G_STD:
916 case VIDIOC_S_STD:
917
918 case VIDIOC_OVERLAY:
919
920 case VIDIOC_ENUMAUDIO:
921 case VIDIOC_ENUMAUDOUT:
922
923 case VIDIOC_ENUMOUTPUT:
924 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
925 return -EINVAL;
926
927 /* Dynamic controls. */
928 case UVCIOC_CTRL_ADD:
929 {
930 struct uvc_xu_control_info *xinfo = arg;
931 struct uvc_control_info *info;
932
933 if (!capable(CAP_SYS_ADMIN))
934 return -EPERM;
935
936 info = kzalloc(sizeof *info, GFP_KERNEL);
937 if (info == NULL)
938 return -ENOMEM;
939
940 memcpy(info->entity, xinfo->entity, sizeof info->entity);
941 info->index = xinfo->index;
942 info->selector = xinfo->selector;
943 info->size = xinfo->size;
944 info->flags = xinfo->flags;
945
946 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
947 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
948
949 ret = uvc_ctrl_add_info(info);
950 if (ret < 0)
951 kfree(info);
952 break;
953 }
954
955 case UVCIOC_CTRL_MAP:
956 {
957 struct uvc_xu_control_mapping *xmap = arg;
958 struct uvc_control_mapping *map;
959
960 if (!capable(CAP_SYS_ADMIN))
961 return -EPERM;
962
963 map = kzalloc(sizeof *map, GFP_KERNEL);
964 if (map == NULL)
965 return -ENOMEM;
966
967 map->id = xmap->id;
968 memcpy(map->name, xmap->name, sizeof map->name);
969 memcpy(map->entity, xmap->entity, sizeof map->entity);
970 map->selector = xmap->selector;
971 map->size = xmap->size;
972 map->offset = xmap->offset;
973 map->v4l2_type = xmap->v4l2_type;
974 map->data_type = xmap->data_type;
975
976 ret = uvc_ctrl_add_mapping(map);
977 if (ret < 0)
978 kfree(map);
979 break;
980 }
981
982 case UVCIOC_CTRL_GET:
983 return uvc_xu_ctrl_query(video, arg, 0);
984
985 case UVCIOC_CTRL_SET:
986 return uvc_xu_ctrl_query(video, arg, 1);
987
988 default:
989 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
990 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
991 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
992 cmd);
993 return ret;
994 }
995
996 return ret;
997 }
998
999 static int uvc_v4l2_ioctl(struct file *file,
1000 unsigned int cmd, unsigned long arg)
1001 {
1002 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1003 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1004 v4l_printk_ioctl(cmd);
1005 printk(")\n");
1006 }
1007
1008 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1009 }
1010
1011 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1012 size_t count, loff_t *ppos)
1013 {
1014 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1015 return -ENODEV;
1016 }
1017
1018 /*
1019 * VMA operations.
1020 */
1021 static void uvc_vm_open(struct vm_area_struct *vma)
1022 {
1023 struct uvc_buffer *buffer = vma->vm_private_data;
1024 buffer->vma_use_count++;
1025 }
1026
1027 static void uvc_vm_close(struct vm_area_struct *vma)
1028 {
1029 struct uvc_buffer *buffer = vma->vm_private_data;
1030 buffer->vma_use_count--;
1031 }
1032
1033 static struct vm_operations_struct uvc_vm_ops = {
1034 .open = uvc_vm_open,
1035 .close = uvc_vm_close,
1036 };
1037
1038 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1039 {
1040 struct uvc_video_device *video = video_drvdata(file);
1041 struct uvc_buffer *uninitialized_var(buffer);
1042 struct page *page;
1043 unsigned long addr, start, size;
1044 unsigned int i;
1045 int ret = 0;
1046
1047 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1048
1049 start = vma->vm_start;
1050 size = vma->vm_end - vma->vm_start;
1051
1052 mutex_lock(&video->queue.mutex);
1053
1054 for (i = 0; i < video->queue.count; ++i) {
1055 buffer = &video->queue.buffer[i];
1056 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1057 break;
1058 }
1059
1060 if (i == video->queue.count || size != video->queue.buf_size) {
1061 ret = -EINVAL;
1062 goto done;
1063 }
1064
1065 /*
1066 * VM_IO marks the area as being an mmaped region for I/O to a
1067 * device. It also prevents the region from being core dumped.
1068 */
1069 vma->vm_flags |= VM_IO;
1070
1071 addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1072 while (size > 0) {
1073 page = vmalloc_to_page((void *)addr);
1074 if ((ret = vm_insert_page(vma, start, page)) < 0)
1075 goto done;
1076
1077 start += PAGE_SIZE;
1078 addr += PAGE_SIZE;
1079 size -= PAGE_SIZE;
1080 }
1081
1082 vma->vm_ops = &uvc_vm_ops;
1083 vma->vm_private_data = buffer;
1084 uvc_vm_open(vma);
1085
1086 done:
1087 mutex_unlock(&video->queue.mutex);
1088 return ret;
1089 }
1090
1091 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1092 {
1093 struct uvc_video_device *video = video_drvdata(file);
1094
1095 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1096
1097 return uvc_queue_poll(&video->queue, file, wait);
1098 }
1099
1100 const struct v4l2_file_operations uvc_fops = {
1101 .owner = THIS_MODULE,
1102 .open = uvc_v4l2_open,
1103 .release = uvc_v4l2_release,
1104 .ioctl = uvc_v4l2_ioctl,
1105 .read = uvc_v4l2_read,
1106 .mmap = uvc_v4l2_mmap,
1107 .poll = uvc_v4l2_poll,
1108 };
1109
kernel source for telekom puls (alcatel/mediatek)