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V4L/DVB: uvcvideo: Check uvc_ctrl_begin return value in VIDIOC_S_CTRL
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / uvc / uvc_v4l2.c
blob43152aa522271763ca831edf15671bb6efac3b59
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_chain *chain,
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(chain, 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_streaming *stream,
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 != stream->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 < stream->nformats; ++i) {
130 format = &stream->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 (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
195 probe->dwMaxVideoFrameSize =
196 stream->ctrl.dwMaxVideoFrameSize;
197
198 /* Probe the device. */
199 ret = uvc_probe_video(stream, probe);
200 if (ret < 0)
201 goto done;
202
203 fmt->fmt.pix.width = frame->wWidth;
204 fmt->fmt.pix.height = frame->wHeight;
205 fmt->fmt.pix.field = V4L2_FIELD_NONE;
206 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
207 fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
208 fmt->fmt.pix.colorspace = format->colorspace;
209 fmt->fmt.pix.priv = 0;
210
211 if (uvc_format != NULL)
212 *uvc_format = format;
213 if (uvc_frame != NULL)
214 *uvc_frame = frame;
215
216 done:
217 return ret;
218 }
219
220 static int uvc_v4l2_get_format(struct uvc_streaming *stream,
221 struct v4l2_format *fmt)
222 {
223 struct uvc_format *format = stream->cur_format;
224 struct uvc_frame *frame = stream->cur_frame;
225
226 if (fmt->type != stream->type)
227 return -EINVAL;
228
229 if (format == NULL || frame == NULL)
230 return -EINVAL;
231
232 fmt->fmt.pix.pixelformat = format->fcc;
233 fmt->fmt.pix.width = frame->wWidth;
234 fmt->fmt.pix.height = frame->wHeight;
235 fmt->fmt.pix.field = V4L2_FIELD_NONE;
236 fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
237 fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
238 fmt->fmt.pix.colorspace = format->colorspace;
239 fmt->fmt.pix.priv = 0;
240
241 return 0;
242 }
243
244 static int uvc_v4l2_set_format(struct uvc_streaming *stream,
245 struct v4l2_format *fmt)
246 {
247 struct uvc_streaming_control probe;
248 struct uvc_format *format;
249 struct uvc_frame *frame;
250 int ret;
251
252 if (fmt->type != stream->type)
253 return -EINVAL;
254
255 if (uvc_queue_allocated(&stream->queue))
256 return -EBUSY;
257
258 ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
259 if (ret < 0)
260 return ret;
261
262 memcpy(&stream->ctrl, &probe, sizeof probe);
263 stream->cur_format = format;
264 stream->cur_frame = frame;
265
266 return 0;
267 }
268
269 static int uvc_v4l2_get_streamparm(struct uvc_streaming *stream,
270 struct v4l2_streamparm *parm)
271 {
272 uint32_t numerator, denominator;
273
274 if (parm->type != stream->type)
275 return -EINVAL;
276
277 numerator = stream->ctrl.dwFrameInterval;
278 denominator = 10000000;
279 uvc_simplify_fraction(&numerator, &denominator, 8, 333);
280
281 memset(parm, 0, sizeof *parm);
282 parm->type = stream->type;
283
284 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
285 parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
286 parm->parm.capture.capturemode = 0;
287 parm->parm.capture.timeperframe.numerator = numerator;
288 parm->parm.capture.timeperframe.denominator = denominator;
289 parm->parm.capture.extendedmode = 0;
290 parm->parm.capture.readbuffers = 0;
291 } else {
292 parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
293 parm->parm.output.outputmode = 0;
294 parm->parm.output.timeperframe.numerator = numerator;
295 parm->parm.output.timeperframe.denominator = denominator;
296 }
297
298 return 0;
299 }
300
301 static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
302 struct v4l2_streamparm *parm)
303 {
304 struct uvc_frame *frame = stream->cur_frame;
305 struct uvc_streaming_control probe;
306 struct v4l2_fract timeperframe;
307 uint32_t interval;
308 int ret;
309
310 if (parm->type != stream->type)
311 return -EINVAL;
312
313 if (uvc_queue_streaming(&stream->queue))
314 return -EBUSY;
315
316 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
317 timeperframe = parm->parm.capture.timeperframe;
318 else
319 timeperframe = parm->parm.output.timeperframe;
320
321 memcpy(&probe, &stream->ctrl, sizeof probe);
322 interval = uvc_fraction_to_interval(timeperframe.numerator,
323 timeperframe.denominator);
324
325 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
326 timeperframe.numerator, timeperframe.denominator, interval);
327 probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
328
329 /* Probe the device with the new settings. */
330 ret = uvc_probe_video(stream, &probe);
331 if (ret < 0)
332 return ret;
333
334 memcpy(&stream->ctrl, &probe, sizeof probe);
335
336 /* Return the actual frame period. */
337 timeperframe.numerator = probe.dwFrameInterval;
338 timeperframe.denominator = 10000000;
339 uvc_simplify_fraction(&timeperframe.numerator,
340 &timeperframe.denominator, 8, 333);
341
342 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
343 parm->parm.capture.timeperframe = timeperframe;
344 else
345 parm->parm.output.timeperframe = timeperframe;
346
347 return 0;
348 }
349
350 /* ------------------------------------------------------------------------
351 * Privilege management
352 */
353
354 /*
355 * Privilege management is the multiple-open implementation basis. The current
356 * implementation is completely transparent for the end-user and doesn't
357 * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
358 * Those ioctls enable finer control on the device (by making possible for a
359 * user to request exclusive access to a device), but are not mature yet.
360 * Switching to the V4L2 priority mechanism might be considered in the future
361 * if this situation changes.
362 *
363 * Each open instance of a UVC device can either be in a privileged or
364 * unprivileged state. Only a single instance can be in a privileged state at
365 * a given time. Trying to perform an operation that requires privileges will
366 * automatically acquire the required privileges if possible, or return -EBUSY
367 * otherwise. Privileges are dismissed when closing the instance or when
368 * freeing the video buffers using VIDIOC_REQBUFS.
369 *
370 * Operations that require privileges are:
371 *
372 * - VIDIOC_S_INPUT
373 * - VIDIOC_S_PARM
374 * - VIDIOC_S_FMT
375 * - VIDIOC_REQBUFS
376 */
377 static int uvc_acquire_privileges(struct uvc_fh *handle)
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 if (atomic_inc_return(&handle->stream->active) != 1) {
385 atomic_dec(&handle->stream->active);
386 return -EBUSY;
387 }
388
389 handle->state = UVC_HANDLE_ACTIVE;
390 return 0;
391 }
392
393 static void uvc_dismiss_privileges(struct uvc_fh *handle)
394 {
395 if (handle->state == UVC_HANDLE_ACTIVE)
396 atomic_dec(&handle->stream->active);
397
398 handle->state = UVC_HANDLE_PASSIVE;
399 }
400
401 static int uvc_has_privileges(struct uvc_fh *handle)
402 {
403 return handle->state == UVC_HANDLE_ACTIVE;
404 }
405
406 /* ------------------------------------------------------------------------
407 * V4L2 file operations
408 */
409
410 static int uvc_v4l2_open(struct file *file)
411 {
412 struct uvc_streaming *stream;
413 struct uvc_fh *handle;
414 int ret = 0;
415
416 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
417 stream = video_drvdata(file);
418
419 if (stream->dev->state & UVC_DEV_DISCONNECTED)
420 return -ENODEV;
421
422 ret = usb_autopm_get_interface(stream->dev->intf);
423 if (ret < 0)
424 return ret;
425
426 /* Create the device handle. */
427 handle = kzalloc(sizeof *handle, GFP_KERNEL);
428 if (handle == NULL) {
429 usb_autopm_put_interface(stream->dev->intf);
430 return -ENOMEM;
431 }
432
433 if (atomic_inc_return(&stream->dev->users) == 1) {
434 ret = uvc_status_start(stream->dev);
435 if (ret < 0) {
436 usb_autopm_put_interface(stream->dev->intf);
437 atomic_dec(&stream->dev->users);
438 kfree(handle);
439 return ret;
440 }
441 }
442
443 handle->chain = stream->chain;
444 handle->stream = stream;
445 handle->state = UVC_HANDLE_PASSIVE;
446 file->private_data = handle;
447
448 return 0;
449 }
450
451 static int uvc_v4l2_release(struct file *file)
452 {
453 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
454 struct uvc_streaming *stream = handle->stream;
455
456 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
457
458 /* Only free resources if this is a privileged handle. */
459 if (uvc_has_privileges(handle)) {
460 uvc_video_enable(stream, 0);
461
462 mutex_lock(&stream->queue.mutex);
463 if (uvc_free_buffers(&stream->queue) < 0)
464 uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
465 "free buffers.\n");
466 mutex_unlock(&stream->queue.mutex);
467 }
468
469 /* Release the file handle. */
470 uvc_dismiss_privileges(handle);
471 kfree(handle);
472 file->private_data = NULL;
473
474 if (atomic_dec_return(&stream->dev->users) == 0)
475 uvc_status_stop(stream->dev);
476
477 usb_autopm_put_interface(stream->dev->intf);
478 return 0;
479 }
480
481 static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
482 {
483 struct video_device *vdev = video_devdata(file);
484 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
485 struct uvc_video_chain *chain = handle->chain;
486 struct uvc_streaming *stream = handle->stream;
487 long ret = 0;
488
489 switch (cmd) {
490 /* Query capabilities */
491 case VIDIOC_QUERYCAP:
492 {
493 struct v4l2_capability *cap = arg;
494
495 memset(cap, 0, sizeof *cap);
496 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
497 strlcpy(cap->card, vdev->name, sizeof cap->card);
498 usb_make_path(stream->dev->udev,
499 cap->bus_info, sizeof(cap->bus_info));
500 cap->version = DRIVER_VERSION_NUMBER;
501 if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
502 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
503 | V4L2_CAP_STREAMING;
504 else
505 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
506 | V4L2_CAP_STREAMING;
507 break;
508 }
509
510 /* Get, Set & Query control */
511 case VIDIOC_QUERYCTRL:
512 return uvc_query_v4l2_ctrl(chain, arg);
513
514 case VIDIOC_G_CTRL:
515 {
516 struct v4l2_control *ctrl = arg;
517 struct v4l2_ext_control xctrl;
518
519 memset(&xctrl, 0, sizeof xctrl);
520 xctrl.id = ctrl->id;
521
522 ret = uvc_ctrl_begin(chain);
523 if (ret < 0)
524 return ret;
525
526 ret = uvc_ctrl_get(chain, &xctrl);
527 uvc_ctrl_rollback(chain);
528 if (ret >= 0)
529 ctrl->value = xctrl.value;
530 break;
531 }
532
533 case VIDIOC_S_CTRL:
534 {
535 struct v4l2_control *ctrl = arg;
536 struct v4l2_ext_control xctrl;
537
538 memset(&xctrl, 0, sizeof xctrl);
539 xctrl.id = ctrl->id;
540 xctrl.value = ctrl->value;
541
542 ret = uvc_ctrl_begin(chain);
543 if (ret < 0)
544 return ret;
545
546 ret = uvc_ctrl_set(chain, &xctrl);
547 if (ret < 0) {
548 uvc_ctrl_rollback(chain);
549 return ret;
550 }
551 ret = uvc_ctrl_commit(chain);
552 if (ret == 0)
553 ctrl->value = xctrl.value;
554 break;
555 }
556
557 case VIDIOC_QUERYMENU:
558 return uvc_v4l2_query_menu(chain, arg);
559
560 case VIDIOC_G_EXT_CTRLS:
561 {
562 struct v4l2_ext_controls *ctrls = arg;
563 struct v4l2_ext_control *ctrl = ctrls->controls;
564 unsigned int i;
565
566 ret = uvc_ctrl_begin(chain);
567 if (ret < 0)
568 return ret;
569
570 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
571 ret = uvc_ctrl_get(chain, ctrl);
572 if (ret < 0) {
573 uvc_ctrl_rollback(chain);
574 ctrls->error_idx = i;
575 return ret;
576 }
577 }
578 ctrls->error_idx = 0;
579 ret = uvc_ctrl_rollback(chain);
580 break;
581 }
582
583 case VIDIOC_S_EXT_CTRLS:
584 case VIDIOC_TRY_EXT_CTRLS:
585 {
586 struct v4l2_ext_controls *ctrls = arg;
587 struct v4l2_ext_control *ctrl = ctrls->controls;
588 unsigned int i;
589
590 ret = uvc_ctrl_begin(chain);
591 if (ret < 0)
592 return ret;
593
594 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
595 ret = uvc_ctrl_set(chain, ctrl);
596 if (ret < 0) {
597 uvc_ctrl_rollback(chain);
598 ctrls->error_idx = i;
599 return ret;
600 }
601 }
602
603 ctrls->error_idx = 0;
604
605 if (cmd == VIDIOC_S_EXT_CTRLS)
606 ret = uvc_ctrl_commit(chain);
607 else
608 ret = uvc_ctrl_rollback(chain);
609 break;
610 }
611
612 /* Get, Set & Enum input */
613 case VIDIOC_ENUMINPUT:
614 {
615 const struct uvc_entity *selector = chain->selector;
616 struct v4l2_input *input = arg;
617 struct uvc_entity *iterm = NULL;
618 u32 index = input->index;
619 int pin = 0;
620
621 if (selector == NULL ||
622 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
623 if (index != 0)
624 return -EINVAL;
625 list_for_each_entry(iterm, &chain->entities, chain) {
626 if (UVC_ENTITY_IS_ITERM(iterm))
627 break;
628 }
629 pin = iterm->id;
630 } else if (pin < selector->bNrInPins) {
631 pin = selector->baSourceID[index];
632 list_for_each_entry(iterm, &chain->entities, chain) {
633 if (!UVC_ENTITY_IS_ITERM(iterm))
634 continue;
635 if (iterm->id == pin)
636 break;
637 }
638 }
639
640 if (iterm == NULL || iterm->id != pin)
641 return -EINVAL;
642
643 memset(input, 0, sizeof *input);
644 input->index = index;
645 strlcpy(input->name, iterm->name, sizeof input->name);
646 if (UVC_ENTITY_TYPE(iterm) == UVC_ITT_CAMERA)
647 input->type = V4L2_INPUT_TYPE_CAMERA;
648 break;
649 }
650
651 case VIDIOC_G_INPUT:
652 {
653 u8 input;
654
655 if (chain->selector == NULL ||
656 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
657 *(int *)arg = 0;
658 break;
659 }
660
661 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
662 chain->selector->id, chain->dev->intfnum,
663 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
664 if (ret < 0)
665 return ret;
666
667 *(int *)arg = input - 1;
668 break;
669 }
670
671 case VIDIOC_S_INPUT:
672 {
673 u32 input = *(u32 *)arg + 1;
674
675 if ((ret = uvc_acquire_privileges(handle)) < 0)
676 return ret;
677
678 if (chain->selector == NULL ||
679 (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
680 if (input != 1)
681 return -EINVAL;
682 break;
683 }
684
685 if (input == 0 || input > chain->selector->bNrInPins)
686 return -EINVAL;
687
688 return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
689 chain->selector->id, chain->dev->intfnum,
690 UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
691 }
692
693 /* Try, Get, Set & Enum format */
694 case VIDIOC_ENUM_FMT:
695 {
696 struct v4l2_fmtdesc *fmt = arg;
697 struct uvc_format *format;
698 enum v4l2_buf_type type = fmt->type;
699 __u32 index = fmt->index;
700
701 if (fmt->type != stream->type ||
702 fmt->index >= stream->nformats)
703 return -EINVAL;
704
705 memset(fmt, 0, sizeof(*fmt));
706 fmt->index = index;
707 fmt->type = type;
708
709 format = &stream->format[fmt->index];
710 fmt->flags = 0;
711 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
712 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
713 strlcpy(fmt->description, format->name,
714 sizeof fmt->description);
715 fmt->description[sizeof fmt->description - 1] = 0;
716 fmt->pixelformat = format->fcc;
717 break;
718 }
719
720 case VIDIOC_TRY_FMT:
721 {
722 struct uvc_streaming_control probe;
723
724 return uvc_v4l2_try_format(stream, arg, &probe, NULL, NULL);
725 }
726
727 case VIDIOC_S_FMT:
728 if ((ret = uvc_acquire_privileges(handle)) < 0)
729 return ret;
730
731 return uvc_v4l2_set_format(stream, arg);
732
733 case VIDIOC_G_FMT:
734 return uvc_v4l2_get_format(stream, arg);
735
736 /* Frame size enumeration */
737 case VIDIOC_ENUM_FRAMESIZES:
738 {
739 struct v4l2_frmsizeenum *fsize = arg;
740 struct uvc_format *format = NULL;
741 struct uvc_frame *frame;
742 int i;
743
744 /* Look for the given pixel format */
745 for (i = 0; i < stream->nformats; i++) {
746 if (stream->format[i].fcc ==
747 fsize->pixel_format) {
748 format = &stream->format[i];
749 break;
750 }
751 }
752 if (format == NULL)
753 return -EINVAL;
754
755 if (fsize->index >= format->nframes)
756 return -EINVAL;
757
758 frame = &format->frame[fsize->index];
759 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
760 fsize->discrete.width = frame->wWidth;
761 fsize->discrete.height = frame->wHeight;
762 break;
763 }
764
765 /* Frame interval enumeration */
766 case VIDIOC_ENUM_FRAMEINTERVALS:
767 {
768 struct v4l2_frmivalenum *fival = arg;
769 struct uvc_format *format = NULL;
770 struct uvc_frame *frame = NULL;
771 int i;
772
773 /* Look for the given pixel format and frame size */
774 for (i = 0; i < stream->nformats; i++) {
775 if (stream->format[i].fcc ==
776 fival->pixel_format) {
777 format = &stream->format[i];
778 break;
779 }
780 }
781 if (format == NULL)
782 return -EINVAL;
783
784 for (i = 0; i < format->nframes; i++) {
785 if (format->frame[i].wWidth == fival->width &&
786 format->frame[i].wHeight == fival->height) {
787 frame = &format->frame[i];
788 break;
789 }
790 }
791 if (frame == NULL)
792 return -EINVAL;
793
794 if (frame->bFrameIntervalType) {
795 if (fival->index >= frame->bFrameIntervalType)
796 return -EINVAL;
797
798 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
799 fival->discrete.numerator =
800 frame->dwFrameInterval[fival->index];
801 fival->discrete.denominator = 10000000;
802 uvc_simplify_fraction(&fival->discrete.numerator,
803 &fival->discrete.denominator, 8, 333);
804 } else {
805 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
806 fival->stepwise.min.numerator =
807 frame->dwFrameInterval[0];
808 fival->stepwise.min.denominator = 10000000;
809 fival->stepwise.max.numerator =
810 frame->dwFrameInterval[1];
811 fival->stepwise.max.denominator = 10000000;
812 fival->stepwise.step.numerator =
813 frame->dwFrameInterval[2];
814 fival->stepwise.step.denominator = 10000000;
815 uvc_simplify_fraction(&fival->stepwise.min.numerator,
816 &fival->stepwise.min.denominator, 8, 333);
817 uvc_simplify_fraction(&fival->stepwise.max.numerator,
818 &fival->stepwise.max.denominator, 8, 333);
819 uvc_simplify_fraction(&fival->stepwise.step.numerator,
820 &fival->stepwise.step.denominator, 8, 333);
821 }
822 break;
823 }
824
825 /* Get & Set streaming parameters */
826 case VIDIOC_G_PARM:
827 return uvc_v4l2_get_streamparm(stream, arg);
828
829 case VIDIOC_S_PARM:
830 if ((ret = uvc_acquire_privileges(handle)) < 0)
831 return ret;
832
833 return uvc_v4l2_set_streamparm(stream, arg);
834
835 /* Cropping and scaling */
836 case VIDIOC_CROPCAP:
837 {
838 struct v4l2_cropcap *ccap = arg;
839 struct uvc_frame *frame = stream->cur_frame;
840
841 if (ccap->type != stream->type)
842 return -EINVAL;
843
844 ccap->bounds.left = 0;
845 ccap->bounds.top = 0;
846 ccap->bounds.width = frame->wWidth;
847 ccap->bounds.height = frame->wHeight;
848
849 ccap->defrect = ccap->bounds;
850
851 ccap->pixelaspect.numerator = 1;
852 ccap->pixelaspect.denominator = 1;
853 break;
854 }
855
856 case VIDIOC_G_CROP:
857 case VIDIOC_S_CROP:
858 return -EINVAL;
859
860 /* Buffers & streaming */
861 case VIDIOC_REQBUFS:
862 {
863 struct v4l2_requestbuffers *rb = arg;
864 unsigned int bufsize =
865 stream->ctrl.dwMaxVideoFrameSize;
866
867 if (rb->type != stream->type ||
868 rb->memory != V4L2_MEMORY_MMAP)
869 return -EINVAL;
870
871 if ((ret = uvc_acquire_privileges(handle)) < 0)
872 return ret;
873
874 ret = uvc_alloc_buffers(&stream->queue, rb->count, bufsize);
875 if (ret < 0)
876 return ret;
877
878 if (ret == 0)
879 uvc_dismiss_privileges(handle);
880
881 rb->count = ret;
882 ret = 0;
883 break;
884 }
885
886 case VIDIOC_QUERYBUF:
887 {
888 struct v4l2_buffer *buf = arg;
889
890 if (buf->type != stream->type)
891 return -EINVAL;
892
893 if (!uvc_has_privileges(handle))
894 return -EBUSY;
895
896 return uvc_query_buffer(&stream->queue, buf);
897 }
898
899 case VIDIOC_QBUF:
900 if (!uvc_has_privileges(handle))
901 return -EBUSY;
902
903 return uvc_queue_buffer(&stream->queue, arg);
904
905 case VIDIOC_DQBUF:
906 if (!uvc_has_privileges(handle))
907 return -EBUSY;
908
909 return uvc_dequeue_buffer(&stream->queue, arg,
910 file->f_flags & O_NONBLOCK);
911
912 case VIDIOC_STREAMON:
913 {
914 int *type = arg;
915
916 if (*type != stream->type)
917 return -EINVAL;
918
919 if (!uvc_has_privileges(handle))
920 return -EBUSY;
921
922 ret = uvc_video_enable(stream, 1);
923 if (ret < 0)
924 return ret;
925 break;
926 }
927
928 case VIDIOC_STREAMOFF:
929 {
930 int *type = arg;
931
932 if (*type != stream->type)
933 return -EINVAL;
934
935 if (!uvc_has_privileges(handle))
936 return -EBUSY;
937
938 return uvc_video_enable(stream, 0);
939 }
940
941 /* Analog video standards make no sense for digital cameras. */
942 case VIDIOC_ENUMSTD:
943 case VIDIOC_QUERYSTD:
944 case VIDIOC_G_STD:
945 case VIDIOC_S_STD:
946
947 case VIDIOC_OVERLAY:
948
949 case VIDIOC_ENUMAUDIO:
950 case VIDIOC_ENUMAUDOUT:
951
952 case VIDIOC_ENUMOUTPUT:
953 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
954 return -EINVAL;
955
956 /* Dynamic controls. */
957 case UVCIOC_CTRL_ADD:
958 {
959 struct uvc_xu_control_info *xinfo = arg;
960 struct uvc_control_info *info;
961
962 if (!capable(CAP_SYS_ADMIN))
963 return -EPERM;
964
965 info = kzalloc(sizeof *info, GFP_KERNEL);
966 if (info == NULL)
967 return -ENOMEM;
968
969 memcpy(info->entity, xinfo->entity, sizeof info->entity);
970 info->index = xinfo->index;
971 info->selector = xinfo->selector;
972 info->size = xinfo->size;
973 info->flags = xinfo->flags;
974
975 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
976 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
977
978 ret = uvc_ctrl_add_info(info);
979 if (ret < 0)
980 kfree(info);
981 break;
982 }
983
984 case UVCIOC_CTRL_MAP:
985 {
986 struct uvc_xu_control_mapping *xmap = arg;
987 struct uvc_control_mapping *map;
988
989 if (!capable(CAP_SYS_ADMIN))
990 return -EPERM;
991
992 map = kzalloc(sizeof *map, GFP_KERNEL);
993 if (map == NULL)
994 return -ENOMEM;
995
996 map->id = xmap->id;
997 memcpy(map->name, xmap->name, sizeof map->name);
998 memcpy(map->entity, xmap->entity, sizeof map->entity);
999 map->selector = xmap->selector;
1000 map->size = xmap->size;
1001 map->offset = xmap->offset;
1002 map->v4l2_type = xmap->v4l2_type;
1003 map->data_type = xmap->data_type;
1004
1005 ret = uvc_ctrl_add_mapping(map);
1006 if (ret < 0)
1007 kfree(map);
1008 break;
1009 }
1010
1011 case UVCIOC_CTRL_GET:
1012 return uvc_xu_ctrl_query(chain, arg, 0);
1013
1014 case UVCIOC_CTRL_SET:
1015 return uvc_xu_ctrl_query(chain, arg, 1);
1016
1017 default:
1018 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
1019 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
1020 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1021 cmd);
1022 return ret;
1023 }
1024
1025 return ret;
1026 }
1027
1028 static long uvc_v4l2_ioctl(struct file *file,
1029 unsigned int cmd, unsigned long arg)
1030 {
1031 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1032 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1033 v4l_printk_ioctl(cmd);
1034 printk(")\n");
1035 }
1036
1037 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
1038 }
1039
1040 static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1041 size_t count, loff_t *ppos)
1042 {
1043 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1044 return -EINVAL;
1045 }
1046
1047 /*
1048 * VMA operations.
1049 */
1050 static void uvc_vm_open(struct vm_area_struct *vma)
1051 {
1052 struct uvc_buffer *buffer = vma->vm_private_data;
1053 buffer->vma_use_count++;
1054 }
1055
1056 static void uvc_vm_close(struct vm_area_struct *vma)
1057 {
1058 struct uvc_buffer *buffer = vma->vm_private_data;
1059 buffer->vma_use_count--;
1060 }
1061
1062 static const struct vm_operations_struct uvc_vm_ops = {
1063 .open = uvc_vm_open,
1064 .close = uvc_vm_close,
1065 };
1066
1067 static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1068 {
1069 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1070 struct uvc_streaming *stream = handle->stream;
1071 struct uvc_video_queue *queue = &stream->queue;
1072 struct uvc_buffer *uninitialized_var(buffer);
1073 struct page *page;
1074 unsigned long addr, start, size;
1075 unsigned int i;
1076 int ret = 0;
1077
1078 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1079
1080 start = vma->vm_start;
1081 size = vma->vm_end - vma->vm_start;
1082
1083 mutex_lock(&queue->mutex);
1084
1085 for (i = 0; i < queue->count; ++i) {
1086 buffer = &queue->buffer[i];
1087 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1088 break;
1089 }
1090
1091 if (i == queue->count || size != queue->buf_size) {
1092 ret = -EINVAL;
1093 goto done;
1094 }
1095
1096 /*
1097 * VM_IO marks the area as being an mmaped region for I/O to a
1098 * device. It also prevents the region from being core dumped.
1099 */
1100 vma->vm_flags |= VM_IO;
1101
1102 addr = (unsigned long)queue->mem + buffer->buf.m.offset;
1103 while (size > 0) {
1104 page = vmalloc_to_page((void *)addr);
1105 if ((ret = vm_insert_page(vma, start, page)) < 0)
1106 goto done;
1107
1108 start += PAGE_SIZE;
1109 addr += PAGE_SIZE;
1110 size -= PAGE_SIZE;
1111 }
1112
1113 vma->vm_ops = &uvc_vm_ops;
1114 vma->vm_private_data = buffer;
1115 uvc_vm_open(vma);
1116
1117 done:
1118 mutex_unlock(&queue->mutex);
1119 return ret;
1120 }
1121
1122 static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1123 {
1124 struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
1125 struct uvc_streaming *stream = handle->stream;
1126
1127 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1128
1129 return uvc_queue_poll(&stream->queue, file, wait);
1130 }
1131
1132 const struct v4l2_file_operations uvc_fops = {
1133 .owner = THIS_MODULE,
1134 .open = uvc_v4l2_open,
1135 .release = uvc_v4l2_release,
1136 .ioctl = uvc_v4l2_ioctl,
1137 .read = uvc_v4l2_read,
1138 .mmap = uvc_v4l2_mmap,
1139 .poll = uvc_v4l2_poll,
1140 };
1141
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