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V4L/DVB (12001): lgs8gxx: update signal strength scale
[linux-2.6-block.git] / drivers / media / video / uvc / uvc_v4l2.c
CommitLineData
c0efd232
LP		 1/*
2 * uvc_v4l2.c -- USB Video Class driver - V4L2 API
3 *
2c2d264b 4 * Copyright (C) 2005-2009
c0efd232
LP		 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>
35ea11ff 26#include <media/v4l2-ioctl.h>
c0efd232
LP		 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
2c2d264b 40 * table for the controls that can be mapped directly, and handle the others
c0efd232
LP		 41 * manually.
42 */
43static 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;
2460cdac
MN		 49 u32 index = query_menu->index;
50 u32 id = query_menu->id;
c0efd232
LP		 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
2460cdac
MN		 59 memset(query_menu, 0, sizeof(*query_menu));
60 query_menu->id = id;
61 query_menu->index = index;
62
c0efd232 63 menu_info = &mapping->menu_info[query_menu->index];
d0ebf307 64 strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
c0efd232
LP		 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 */
74static __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
106static 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
ff924203 119 if (fmt->type != video->streaming->type)
c0efd232
LP		 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
2c2d264b 198 /* Probe the device. */
c0efd232
LP		 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
215done:
216 return ret;
217}
218
219static 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
ff924203 225 if (fmt->type != video->streaming->type)
c0efd232
LP		 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
243static 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
ff924203 251 if (fmt->type != video->streaming->type)
c0efd232
LP		 252 return -EINVAL;
253
23ff6043 254 if (uvc_queue_allocated(&video->queue))
c0efd232
LP		 255 return -EBUSY;
256
257 ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
258 if (ret < 0)
259 return ret;
260
c0efd232
LP		 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
268static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
269 struct v4l2_streamparm *parm)
270{
271 uint32_t numerator, denominator;
272
ff924203 273 if (parm->type != video->streaming->type)
c0efd232
LP		 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);
ff924203
LP		 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 }
c0efd232
LP		 296
297 return 0;
298}
299
300static 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;
ff924203 305 struct v4l2_fract timeperframe;
c0efd232
LP		 306 uint32_t interval;
307 int ret;
308
ff924203 309 if (parm->type != video->streaming->type)
c0efd232
LP		 310 return -EINVAL;
311
312 if (uvc_queue_streaming(&video->queue))
313 return -EBUSY;
314
ff924203
LP		 315 if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
316 timeperframe = parm->parm.capture.timeperframe;
317 else
318 timeperframe = parm->parm.output.timeperframe;
319
c0efd232 320 memcpy(&probe, &video->streaming->ctrl, sizeof probe);
ff924203
LP		 321 interval = uvc_fraction_to_interval(timeperframe.numerator,
322 timeperframe.denominator);
c0efd232
LP		 323
324 uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
ff924203 325 timeperframe.numerator, timeperframe.denominator, interval);
c0efd232
LP		 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
c0efd232
LP		 332 memcpy(&video->streaming->ctrl, &probe, sizeof probe);
333
334 /* Return the actual frame period. */
ff924203
LP		 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;
c0efd232
LP		 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
2c2d264b 363 * a given time. Trying to perform an operation that requires privileges will
c0efd232
LP		 364 * automatically acquire the required privileges if possible, or return -EBUSY
365 * otherwise. Privileges are dismissed when closing the instance.
366 *
2c2d264b 367 * Operations that require privileges are:
c0efd232
LP		 368 *
369 * - VIDIOC_S_INPUT
370 * - VIDIOC_S_PARM
371 * - VIDIOC_S_FMT
372 * - VIDIOC_TRY_FMT
373 * - VIDIOC_REQBUFS
374 */
375static 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
393done:
394 mutex_unlock(&uvc_driver.open_mutex);
395 return ret;
396}
397
398static 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
406static 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
bec43661 415static int uvc_v4l2_open(struct file *file)
c0efd232 416{
c0efd232
LP		 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);
c170ecf4 423 video = video_drvdata(file);
c0efd232
LP		 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
04a37e0f
LP		 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
c0efd232
LP		 451 handle->device = video;
452 handle->state = UVC_HANDLE_PASSIVE;
453 file->private_data = handle;
454
455 kref_get(&video->dev->kref);
456
457done:
458 mutex_unlock(&uvc_driver.open_mutex);
459 return ret;
460}
461
bec43661 462static int uvc_v4l2_release(struct file *file)
c0efd232 463{
c170ecf4 464 struct uvc_video_device *video = video_drvdata(file);
c0efd232
LP		 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
04a37e0f
LP		 485 if (atomic_dec_return(&video->dev->users) == 0)
486 uvc_status_stop(video->dev);
487
c0efd232
LP		 488 usb_autopm_put_interface(video->dev->intf);
489 kref_put(&video->dev->kref, uvc_delete);
490 return 0;
491}
492
069b7479 493static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
c0efd232
LP		 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;
069b7479 498 long ret = 0;
c0efd232 499
c0efd232
LP		 500 switch (cmd) {
501 /* Query capabilities */
502 case VIDIOC_QUERYCAP:
503 {
504 struct v4l2_capability *cap = arg;
505
506 memset(cap, 0, sizeof *cap);
d0ebf307
LP		 507 strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
508 strlcpy(cap->card, vdev->name, sizeof cap->card);
b12049a2
TM		 509 usb_make_path(video->dev->udev,
510 cap->bus_info, sizeof(cap->bus_info));
c0efd232 511 cap->version = DRIVER_VERSION_NUMBER;
ff924203
LP		 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;
c0efd232
LP		 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 uvc_ctrl_begin(video);
534 ret = uvc_ctrl_get(video, &xctrl);
535 uvc_ctrl_rollback(video);
536 if (ret >= 0)
537 ctrl->value = xctrl.value;
538 break;
539 }
540
541 case VIDIOC_S_CTRL:
542 {
543 struct v4l2_control *ctrl = arg;
544 struct v4l2_ext_control xctrl;
545
546 memset(&xctrl, 0, sizeof xctrl);
547 xctrl.id = ctrl->id;
548 xctrl.value = ctrl->value;
549
550 uvc_ctrl_begin(video);
551 ret = uvc_ctrl_set(video, &xctrl);
552 if (ret < 0) {
553 uvc_ctrl_rollback(video);
554 return ret;
555 }
556 ret = uvc_ctrl_commit(video);
557 break;
558 }
559
560 case VIDIOC_QUERYMENU:
561 return uvc_v4l2_query_menu(video, arg);
562
563 case VIDIOC_G_EXT_CTRLS:
564 {
565 struct v4l2_ext_controls *ctrls = arg;
566 struct v4l2_ext_control *ctrl = ctrls->controls;
567 unsigned int i;
568
569 uvc_ctrl_begin(video);
570 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
571 ret = uvc_ctrl_get(video, ctrl);
572 if (ret < 0) {
573 uvc_ctrl_rollback(video);
574 ctrls->error_idx = i;
575 return ret;
576 }
577 }
578 ctrls->error_idx = 0;
579 ret = uvc_ctrl_rollback(video);
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(video);
591 if (ret < 0)
592 return ret;
593
594 for (i = 0; i < ctrls->count; ++ctrl, ++i) {
595 ret = uvc_ctrl_set(video, ctrl);
596 if (ret < 0) {
597 uvc_ctrl_rollback(video);
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(video);
607 else
608 ret = uvc_ctrl_rollback(video);
609 break;
610 }
611
612 /* Get, Set & Enum input */
613 case VIDIOC_ENUMINPUT:
614 {
615 const struct uvc_entity *selector = video->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 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
623 if (index != 0)
624 return -EINVAL;
625 iterm = list_first_entry(&video->iterms,
626 struct uvc_entity, chain);
627 pin = iterm->id;
628 } else if (pin < selector->selector.bNrInPins) {
629 pin = selector->selector.baSourceID[index];
630 list_for_each_entry(iterm, video->iterms.next, chain) {
631 if (iterm->id == pin)
632 break;
633 }
634 }
635
636 if (iterm == NULL || iterm->id != pin)
637 return -EINVAL;
638
639 memset(input, 0, sizeof *input);
640 input->index = index;
d0ebf307 641 strlcpy(input->name, iterm->name, sizeof input->name);
c0efd232
LP		 642 if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
643 input->type = V4L2_INPUT_TYPE_CAMERA;
644 break;
645 }
646
647 case VIDIOC_G_INPUT:
648 {
649 u8 input;
650
651 if (video->selector == NULL ||
652 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
653 *(int *)arg = 0;
654 break;
655 }
656
657 ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
658 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
659 &input, 1);
660 if (ret < 0)
661 return ret;
662
663 *(int *)arg = input - 1;
664 break;
665 }
666
667 case VIDIOC_S_INPUT:
668 {
9086c7b9 669 u32 input = *(u32 *)arg + 1;
c0efd232
LP		 670
671 if ((ret = uvc_acquire_privileges(handle)) < 0)
672 return ret;
673
674 if (video->selector == NULL ||
675 (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
676 if (input != 1)
677 return -EINVAL;
678 break;
679 }
680
9086c7b9 681 if (input == 0 || input > video->selector->selector.bNrInPins)
c0efd232
LP		 682 return -EINVAL;
683
684 return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
685 video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
686 &input, 1);
687 }
688
689 /* Try, Get, Set & Enum format */
690 case VIDIOC_ENUM_FMT:
691 {
692 struct v4l2_fmtdesc *fmt = arg;
693 struct uvc_format *format;
8bbd90ce
MN		 694 enum v4l2_buf_type type = fmt->type;
695 __u32 index = fmt->index;
c0efd232 696
ff924203 697 if (fmt->type != video->streaming->type ||
c0efd232
LP		 698 fmt->index >= video->streaming->nformats)
699 return -EINVAL;
700
8bbd90ce
MN		 701 memset(fmt, 0, sizeof(*fmt));
702 fmt->index = index;
703 fmt->type = type;
704
c0efd232
LP		 705 format = &video->streaming->format[fmt->index];
706 fmt->flags = 0;
707 if (format->flags & UVC_FMT_FLAG_COMPRESSED)
708 fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
d0ebf307 709 strlcpy(fmt->description, format->name,
c0efd232
LP		 710 sizeof fmt->description);
711 fmt->description[sizeof fmt->description - 1] = 0;
712 fmt->pixelformat = format->fcc;
713 break;
714 }
715
716 case VIDIOC_TRY_FMT:
717 {
718 struct uvc_streaming_control probe;
719
720 if ((ret = uvc_acquire_privileges(handle)) < 0)
721 return ret;
722
723 return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
724 }
725
726 case VIDIOC_S_FMT:
727 if ((ret = uvc_acquire_privileges(handle)) < 0)
728 return ret;
729
730 return uvc_v4l2_set_format(video, arg);
731
732 case VIDIOC_G_FMT:
733 return uvc_v4l2_get_format(video, arg);
734
735 /* Frame size enumeration */
736 case VIDIOC_ENUM_FRAMESIZES:
737 {
738 struct v4l2_frmsizeenum *fsize = arg;
739 struct uvc_format *format = NULL;
740 struct uvc_frame *frame;
741 int i;
742
743 /* Look for the given pixel format */
744 for (i = 0; i < video->streaming->nformats; i++) {
745 if (video->streaming->format[i].fcc ==
746 fsize->pixel_format) {
747 format = &video->streaming->format[i];
748 break;
749 }
750 }
751 if (format == NULL)
752 return -EINVAL;
753
754 if (fsize->index >= format->nframes)
755 return -EINVAL;
756
757 frame = &format->frame[fsize->index];
758 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
759 fsize->discrete.width = frame->wWidth;
760 fsize->discrete.height = frame->wHeight;
761 break;
762 }
763
764 /* Frame interval enumeration */
765 case VIDIOC_ENUM_FRAMEINTERVALS:
766 {
767 struct v4l2_frmivalenum *fival = arg;
768 struct uvc_format *format = NULL;
769 struct uvc_frame *frame = NULL;
770 int i;
771
772 /* Look for the given pixel format and frame size */
773 for (i = 0; i < video->streaming->nformats; i++) {
774 if (video->streaming->format[i].fcc ==
775 fival->pixel_format) {
776 format = &video->streaming->format[i];
777 break;
778 }
779 }
780 if (format == NULL)
781 return -EINVAL;
782
783 for (i = 0; i < format->nframes; i++) {
784 if (format->frame[i].wWidth == fival->width &&
785 format->frame[i].wHeight == fival->height) {
786 frame = &format->frame[i];
787 break;
788 }
789 }
790 if (frame == NULL)
791 return -EINVAL;
792
793 if (frame->bFrameIntervalType) {
794 if (fival->index >= frame->bFrameIntervalType)
795 return -EINVAL;
796
797 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
798 fival->discrete.numerator =
799 frame->dwFrameInterval[fival->index];
800 fival->discrete.denominator = 10000000;
801 uvc_simplify_fraction(&fival->discrete.numerator,
802 &fival->discrete.denominator, 8, 333);
803 } else {
804 fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
805 fival->stepwise.min.numerator =
806 frame->dwFrameInterval[0];
807 fival->stepwise.min.denominator = 10000000;
808 fival->stepwise.max.numerator =
809 frame->dwFrameInterval[1];
810 fival->stepwise.max.denominator = 10000000;
811 fival->stepwise.step.numerator =
812 frame->dwFrameInterval[2];
813 fival->stepwise.step.denominator = 10000000;
814 uvc_simplify_fraction(&fival->stepwise.min.numerator,
815 &fival->stepwise.min.denominator, 8, 333);
816 uvc_simplify_fraction(&fival->stepwise.max.numerator,
817 &fival->stepwise.max.denominator, 8, 333);
818 uvc_simplify_fraction(&fival->stepwise.step.numerator,
819 &fival->stepwise.step.denominator, 8, 333);
820 }
821 break;
822 }
823
824 /* Get & Set streaming parameters */
825 case VIDIOC_G_PARM:
826 return uvc_v4l2_get_streamparm(video, arg);
827
828 case VIDIOC_S_PARM:
829 if ((ret = uvc_acquire_privileges(handle)) < 0)
830 return ret;
831
832 return uvc_v4l2_set_streamparm(video, arg);
833
834 /* Cropping and scaling */
835 case VIDIOC_CROPCAP:
836 {
837 struct v4l2_cropcap *ccap = arg;
838 struct uvc_frame *frame = video->streaming->cur_frame;
839
ff924203 840 if (ccap->type != video->streaming->type)
c0efd232
LP		 841 return -EINVAL;
842
843 ccap->bounds.left = 0;
844 ccap->bounds.top = 0;
845 ccap->bounds.width = frame->wWidth;
846 ccap->bounds.height = frame->wHeight;
847
848 ccap->defrect = ccap->bounds;
849
850 ccap->pixelaspect.numerator = 1;
851 ccap->pixelaspect.denominator = 1;
852 break;
853 }
854
855 case VIDIOC_G_CROP:
856 case VIDIOC_S_CROP:
857 return -EINVAL;
858
859 /* Buffers & streaming */
860 case VIDIOC_REQBUFS:
861 {
862 struct v4l2_requestbuffers *rb = arg;
863 unsigned int bufsize =
864 video->streaming->ctrl.dwMaxVideoFrameSize;
865
ff924203 866 if (rb->type != video->streaming->type ||
c0efd232
LP		 867 rb->memory != V4L2_MEMORY_MMAP)
868 return -EINVAL;
869
870 if ((ret = uvc_acquire_privileges(handle)) < 0)
871 return ret;
872
873 ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
874 if (ret < 0)
875 return ret;
876
c0efd232
LP		 877 rb->count = ret;
878 ret = 0;
879 break;
880 }
881
882 case VIDIOC_QUERYBUF:
883 {
884 struct v4l2_buffer *buf = arg;
885
ff924203 886 if (buf->type != video->streaming->type)
c0efd232
LP		 887 return -EINVAL;
888
889 if (!uvc_has_privileges(handle))
890 return -EBUSY;
891
892 return uvc_query_buffer(&video->queue, buf);
893 }
894
895 case VIDIOC_QBUF:
896 if (!uvc_has_privileges(handle))
897 return -EBUSY;
898
899 return uvc_queue_buffer(&video->queue, arg);
900
901 case VIDIOC_DQBUF:
902 if (!uvc_has_privileges(handle))
903 return -EBUSY;
904
905 return uvc_dequeue_buffer(&video->queue, arg,
906 file->f_flags & O_NONBLOCK);
907
908 case VIDIOC_STREAMON:
909 {
910 int *type = arg;
911
ff924203 912 if (*type != video->streaming->type)
c0efd232
LP		 913 return -EINVAL;
914
915 if (!uvc_has_privileges(handle))
916 return -EBUSY;
917
918 if ((ret = uvc_video_enable(video, 1)) < 0)
919 return ret;
920 break;
921 }
922
923 case VIDIOC_STREAMOFF:
924 {
925 int *type = arg;
926
ff924203 927 if (*type != video->streaming->type)
c0efd232
LP		 928 return -EINVAL;
929
930 if (!uvc_has_privileges(handle))
931 return -EBUSY;
932
933 return uvc_video_enable(video, 0);
934 }
935
936 /* Analog video standards make no sense for digital cameras. */
937 case VIDIOC_ENUMSTD:
938 case VIDIOC_QUERYSTD:
939 case VIDIOC_G_STD:
940 case VIDIOC_S_STD:
941
942 case VIDIOC_OVERLAY:
943
944 case VIDIOC_ENUMAUDIO:
945 case VIDIOC_ENUMAUDOUT:
946
947 case VIDIOC_ENUMOUTPUT:
948 uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
949 return -EINVAL;
950
951 /* Dynamic controls. */
952 case UVCIOC_CTRL_ADD:
953 {
954 struct uvc_xu_control_info *xinfo = arg;
955 struct uvc_control_info *info;
956
957 if (!capable(CAP_SYS_ADMIN))
958 return -EPERM;
959
9768352a 960 info = kzalloc(sizeof *info, GFP_KERNEL);
c0efd232
LP		 961 if (info == NULL)
962 return -ENOMEM;
963
964 memcpy(info->entity, xinfo->entity, sizeof info->entity);
965 info->index = xinfo->index;
966 info->selector = xinfo->selector;
967 info->size = xinfo->size;
968 info->flags = xinfo->flags;
969
970 info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
971 UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
972
973 ret = uvc_ctrl_add_info(info);
974 if (ret < 0)
975 kfree(info);
976 break;
977 }
978
979 case UVCIOC_CTRL_MAP:
980 {
981 struct uvc_xu_control_mapping *xmap = arg;
982 struct uvc_control_mapping *map;
983
984 if (!capable(CAP_SYS_ADMIN))
985 return -EPERM;
986
9768352a 987 map = kzalloc(sizeof *map, GFP_KERNEL);
c0efd232
LP		 988 if (map == NULL)
989 return -ENOMEM;
990
991 map->id = xmap->id;
992 memcpy(map->name, xmap->name, sizeof map->name);
993 memcpy(map->entity, xmap->entity, sizeof map->entity);
994 map->selector = xmap->selector;
995 map->size = xmap->size;
996 map->offset = xmap->offset;
997 map->v4l2_type = xmap->v4l2_type;
998 map->data_type = xmap->data_type;
999
1000 ret = uvc_ctrl_add_mapping(map);
1001 if (ret < 0)
1002 kfree(map);
1003 break;
1004 }
1005
1006 case UVCIOC_CTRL_GET:
1007 return uvc_xu_ctrl_query(video, arg, 0);
1008
1009 case UVCIOC_CTRL_SET:
1010 return uvc_xu_ctrl_query(video, arg, 1);
1011
1012 default:
b1f88407 1013 if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,
f473bf76 1014 uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
c0efd232
LP		 1015 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
1016 cmd);
1017 return ret;
1018 }
1019
1020 return ret;
1021}
1022
069b7479 1023static long uvc_v4l2_ioctl(struct file *file,
c0efd232
LP		 1024 unsigned int cmd, unsigned long arg)
1025{
308bb52c
LP		 1026 if (uvc_trace_param & UVC_TRACE_IOCTL) {
1027 uvc_printk(KERN_DEBUG, "uvc_v4l2_ioctl(");
1028 v4l_printk_ioctl(cmd);
1029 printk(")\n");
1030 }
1031
f473bf76 1032 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
c0efd232
LP		 1033}
1034
1035static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
1036 size_t count, loff_t *ppos)
1037{
1038 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
1039 return -ENODEV;
1040}
1041
1042/*
1043 * VMA operations.
1044 */
1045static void uvc_vm_open(struct vm_area_struct *vma)
1046{
1047 struct uvc_buffer *buffer = vma->vm_private_data;
1048 buffer->vma_use_count++;
1049}
1050
1051static void uvc_vm_close(struct vm_area_struct *vma)
1052{
1053 struct uvc_buffer *buffer = vma->vm_private_data;
1054 buffer->vma_use_count--;
1055}
1056
1057static struct vm_operations_struct uvc_vm_ops = {
1058 .open = uvc_vm_open,
1059 .close = uvc_vm_close,
1060};
1061
1062static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
1063{
c170ecf4 1064 struct uvc_video_device *video = video_drvdata(file);
6f80e1b4 1065 struct uvc_buffer *uninitialized_var(buffer);
c0efd232
LP		 1066 struct page *page;
1067 unsigned long addr, start, size;
1068 unsigned int i;
1069 int ret = 0;
1070
1071 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
1072
1073 start = vma->vm_start;
1074 size = vma->vm_end - vma->vm_start;
1075
1076 mutex_lock(&video->queue.mutex);
1077
1078 for (i = 0; i < video->queue.count; ++i) {
1079 buffer = &video->queue.buffer[i];
1080 if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1081 break;
1082 }
1083
1084 if (i == video->queue.count || size != video->queue.buf_size) {
1085 ret = -EINVAL;
1086 goto done;
1087 }
1088
1089 /*
1090 * VM_IO marks the area as being an mmaped region for I/O to a
1091 * device. It also prevents the region from being core dumped.
1092 */
1093 vma->vm_flags |= VM_IO;
1094
1095 addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
1096 while (size > 0) {
1097 page = vmalloc_to_page((void *)addr);
1098 if ((ret = vm_insert_page(vma, start, page)) < 0)
1099 goto done;
1100
1101 start += PAGE_SIZE;
1102 addr += PAGE_SIZE;
1103 size -= PAGE_SIZE;
1104 }
1105
1106 vma->vm_ops = &uvc_vm_ops;
1107 vma->vm_private_data = buffer;
1108 uvc_vm_open(vma);
1109
1110done:
1111 mutex_unlock(&video->queue.mutex);
1112 return ret;
1113}
1114
1115static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
1116{
c170ecf4 1117 struct uvc_video_device *video = video_drvdata(file);
c0efd232
LP		 1118
1119 uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
1120
1121 return uvc_queue_poll(&video->queue, file, wait);
1122}
1123
bec43661 1124const struct v4l2_file_operations uvc_fops = {
c0efd232
LP		 1125 .owner = THIS_MODULE,
1126 .open = uvc_v4l2_open,
1127 .release = uvc_v4l2_release,
1128 .ioctl = uvc_v4l2_ioctl,
c0efd232
LP		 1129 .read = uvc_v4l2_read,
1130 .mmap = uvc_v4l2_mmap,
1131 .poll = uvc_v4l2_poll,
1132};
f87086e3 1133
Linux 6.x block layer and io_uring tree(s)