1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * uvc_v4l2.c -- USB Video Class Gadget driver |
4 | * |
5 | * Copyright (C) 2009-2010 |
6 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) |
7 | */ |
8 | |
9 | #include <linux/device.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/list.h> |
13 | #include <linux/usb/g_uvc.h> |
14 | #include <linux/usb/uvc.h> |
15 | #include <linux/videodev2.h> |
16 | #include <linux/vmalloc.h> |
17 | #include <linux/wait.h> |
18 | |
19 | #include <media/v4l2-dev.h> |
20 | #include <media/v4l2-event.h> |
21 | #include <media/v4l2-ioctl.h> |
22 | |
23 | #include "f_uvc.h" |
24 | #include "uvc.h" |
25 | #include "uvc_queue.h" |
26 | #include "uvc_video.h" |
27 | #include "uvc_v4l2.h" |
28 | #include "uvc_configfs.h" |
29 | |
30 | static const struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat) |
31 | { |
32 | char guid[16] = UVC_GUID_FORMAT_MJPEG; |
33 | const struct uvc_format_desc *format; |
34 | struct uvcg_uncompressed *unc; |
35 | |
36 | if (uformat->type == UVCG_UNCOMPRESSED) { |
37 | unc = to_uvcg_uncompressed(item: &uformat->group.cg_item); |
38 | if (!unc) |
39 | return ERR_PTR(error: -EINVAL); |
40 | |
41 | memcpy(guid, unc->desc.guidFormat, sizeof(guid)); |
42 | } |
43 | |
44 | format = uvc_format_by_guid(guid); |
45 | if (!format) |
46 | return ERR_PTR(error: -EINVAL); |
47 | |
48 | return format; |
49 | } |
50 | |
51 | static int uvc_v4l2_get_bytesperline(struct uvcg_format *uformat, |
52 | struct uvcg_frame *uframe) |
53 | { |
54 | struct uvcg_uncompressed *u; |
55 | |
56 | if (uformat->type == UVCG_UNCOMPRESSED) { |
57 | u = to_uvcg_uncompressed(item: &uformat->group.cg_item); |
58 | if (!u) |
59 | return 0; |
60 | |
61 | return u->desc.bBitsPerPixel * uframe->frame.w_width / 8; |
62 | } |
63 | |
64 | return 0; |
65 | } |
66 | |
67 | static int uvc_get_frame_size(struct uvcg_format *uformat, |
68 | struct uvcg_frame *uframe) |
69 | { |
70 | unsigned int bpl = uvc_v4l2_get_bytesperline(uformat, uframe); |
71 | |
72 | return bpl ? bpl * uframe->frame.w_height : |
73 | uframe->frame.dw_max_video_frame_buffer_size; |
74 | } |
75 | |
76 | static struct uvcg_format *find_format_by_index(struct uvc_device *uvc, int index) |
77 | { |
78 | struct uvcg_format_ptr *format; |
79 | struct uvcg_format *uformat = NULL; |
80 | int i = 1; |
81 | |
82 | list_for_each_entry(format, &uvc->header->formats, entry) { |
83 | if (index == i) { |
84 | uformat = format->fmt; |
85 | break; |
86 | } |
87 | i++; |
88 | } |
89 | |
90 | return uformat; |
91 | } |
92 | |
93 | static struct uvcg_frame *find_frame_by_index(struct uvc_device *uvc, |
94 | struct uvcg_format *uformat, |
95 | int index) |
96 | { |
97 | struct uvcg_format_ptr *format; |
98 | struct uvcg_frame_ptr *frame; |
99 | struct uvcg_frame *uframe = NULL; |
100 | |
101 | list_for_each_entry(format, &uvc->header->formats, entry) { |
102 | if (format->fmt->type != uformat->type) |
103 | continue; |
104 | list_for_each_entry(frame, &format->fmt->frames, entry) { |
105 | if (index == frame->frm->frame.b_frame_index) { |
106 | uframe = frame->frm; |
107 | break; |
108 | } |
109 | } |
110 | } |
111 | |
112 | return uframe; |
113 | } |
114 | |
115 | static struct uvcg_format *find_format_by_pix(struct uvc_device *uvc, |
116 | u32 pixelformat) |
117 | { |
118 | struct uvcg_format_ptr *format; |
119 | struct uvcg_format *uformat = NULL; |
120 | |
121 | list_for_each_entry(format, &uvc->header->formats, entry) { |
122 | const struct uvc_format_desc *fmtdesc = to_uvc_format(uformat: format->fmt); |
123 | |
124 | if (fmtdesc->fcc == pixelformat) { |
125 | uformat = format->fmt; |
126 | break; |
127 | } |
128 | } |
129 | |
130 | return uformat; |
131 | } |
132 | |
133 | static struct uvcg_frame *find_closest_frame_by_size(struct uvc_device *uvc, |
134 | struct uvcg_format *uformat, |
135 | u16 rw, u16 rh) |
136 | { |
137 | struct uvc_video *video = &uvc->video; |
138 | struct uvcg_format_ptr *format; |
139 | struct uvcg_frame_ptr *frame; |
140 | struct uvcg_frame *uframe = NULL; |
141 | unsigned int d, maxd; |
142 | |
143 | /* Find the closest image size. The distance between image sizes is |
144 | * the size in pixels of the non-overlapping regions between the |
145 | * requested size and the frame-specified size. |
146 | */ |
147 | maxd = (unsigned int)-1; |
148 | |
149 | list_for_each_entry(format, &uvc->header->formats, entry) { |
150 | if (format->fmt->type != uformat->type) |
151 | continue; |
152 | |
153 | list_for_each_entry(frame, &format->fmt->frames, entry) { |
154 | u16 w, h; |
155 | |
156 | w = frame->frm->frame.w_width; |
157 | h = frame->frm->frame.w_height; |
158 | |
159 | d = min(w, rw) * min(h, rh); |
160 | d = w*h + rw*rh - 2*d; |
161 | if (d < maxd) { |
162 | maxd = d; |
163 | uframe = frame->frm; |
164 | } |
165 | |
166 | if (maxd == 0) |
167 | break; |
168 | } |
169 | } |
170 | |
171 | if (!uframe) |
172 | uvcg_dbg(&video->uvc->func, "Unsupported size %ux%u\n" , rw, rh); |
173 | |
174 | return uframe; |
175 | } |
176 | |
177 | /* -------------------------------------------------------------------------- |
178 | * Requests handling |
179 | */ |
180 | |
181 | static int |
182 | uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) |
183 | { |
184 | struct usb_composite_dev *cdev = uvc->func.config->cdev; |
185 | struct usb_request *req = uvc->control_req; |
186 | |
187 | if (data->length < 0) |
188 | return usb_ep_set_halt(ep: cdev->gadget->ep0); |
189 | |
190 | req->length = min_t(unsigned int, uvc->event_length, data->length); |
191 | req->zero = data->length < uvc->event_length; |
192 | |
193 | memcpy(req->buf, data->data, req->length); |
194 | |
195 | return usb_ep_queue(ep: cdev->gadget->ep0, req, GFP_KERNEL); |
196 | } |
197 | |
198 | /* -------------------------------------------------------------------------- |
199 | * V4L2 ioctls |
200 | */ |
201 | |
202 | static int |
203 | uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap) |
204 | { |
205 | struct video_device *vdev = video_devdata(file); |
206 | struct uvc_device *uvc = video_get_drvdata(vdev); |
207 | struct usb_composite_dev *cdev = uvc->func.config->cdev; |
208 | |
209 | strscpy(cap->driver, "g_uvc" , sizeof(cap->driver)); |
210 | strscpy(cap->card, cdev->gadget->name, sizeof(cap->card)); |
211 | strscpy(cap->bus_info, dev_name(&cdev->gadget->dev), |
212 | sizeof(cap->bus_info)); |
213 | return 0; |
214 | } |
215 | |
216 | static int |
217 | uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt) |
218 | { |
219 | struct video_device *vdev = video_devdata(file); |
220 | struct uvc_device *uvc = video_get_drvdata(vdev); |
221 | struct uvc_video *video = &uvc->video; |
222 | |
223 | fmt->fmt.pix.pixelformat = video->fcc; |
224 | fmt->fmt.pix.width = video->width; |
225 | fmt->fmt.pix.height = video->height; |
226 | fmt->fmt.pix.field = V4L2_FIELD_NONE; |
227 | fmt->fmt.pix.bytesperline = video->bpp * video->width / 8; |
228 | fmt->fmt.pix.sizeimage = video->imagesize; |
229 | fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; |
230 | fmt->fmt.pix.priv = 0; |
231 | |
232 | return 0; |
233 | } |
234 | |
235 | static int |
236 | uvc_v4l2_try_format(struct file *file, void *fh, struct v4l2_format *fmt) |
237 | { |
238 | struct video_device *vdev = video_devdata(file); |
239 | struct uvc_device *uvc = video_get_drvdata(vdev); |
240 | struct uvc_video *video = &uvc->video; |
241 | struct uvcg_format *uformat; |
242 | struct uvcg_frame *uframe; |
243 | u8 *fcc; |
244 | |
245 | if (fmt->type != video->queue.queue.type) |
246 | return -EINVAL; |
247 | |
248 | fcc = (u8 *)&fmt->fmt.pix.pixelformat; |
249 | uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n" , |
250 | fmt->fmt.pix.pixelformat, |
251 | fcc[0], fcc[1], fcc[2], fcc[3], |
252 | fmt->fmt.pix.width, fmt->fmt.pix.height); |
253 | |
254 | uformat = find_format_by_pix(uvc, pixelformat: fmt->fmt.pix.pixelformat); |
255 | if (!uformat) |
256 | return -EINVAL; |
257 | |
258 | uframe = find_closest_frame_by_size(uvc, uformat, |
259 | rw: fmt->fmt.pix.width, rh: fmt->fmt.pix.height); |
260 | if (!uframe) |
261 | return -EINVAL; |
262 | |
263 | fmt->fmt.pix.width = uframe->frame.w_width; |
264 | fmt->fmt.pix.height = uframe->frame.w_height; |
265 | fmt->fmt.pix.field = V4L2_FIELD_NONE; |
266 | fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe); |
267 | fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe); |
268 | fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc; |
269 | fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; |
270 | fmt->fmt.pix.priv = 0; |
271 | |
272 | return 0; |
273 | } |
274 | |
275 | static int |
276 | uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt) |
277 | { |
278 | struct video_device *vdev = video_devdata(file); |
279 | struct uvc_device *uvc = video_get_drvdata(vdev); |
280 | struct uvc_video *video = &uvc->video; |
281 | int ret; |
282 | |
283 | ret = uvc_v4l2_try_format(file, fh, fmt); |
284 | if (ret) |
285 | return ret; |
286 | |
287 | video->fcc = fmt->fmt.pix.pixelformat; |
288 | video->bpp = fmt->fmt.pix.bytesperline * 8 / video->width; |
289 | video->width = fmt->fmt.pix.width; |
290 | video->height = fmt->fmt.pix.height; |
291 | video->imagesize = fmt->fmt.pix.sizeimage; |
292 | |
293 | return ret; |
294 | } |
295 | |
296 | static int |
297 | uvc_v4l2_enum_frameintervals(struct file *file, void *fh, |
298 | struct v4l2_frmivalenum *fival) |
299 | { |
300 | struct video_device *vdev = video_devdata(file); |
301 | struct uvc_device *uvc = video_get_drvdata(vdev); |
302 | struct uvcg_format *uformat = NULL; |
303 | struct uvcg_frame *uframe = NULL; |
304 | struct uvcg_frame_ptr *frame; |
305 | |
306 | uformat = find_format_by_pix(uvc, pixelformat: fival->pixel_format); |
307 | if (!uformat) |
308 | return -EINVAL; |
309 | |
310 | list_for_each_entry(frame, &uformat->frames, entry) { |
311 | if (frame->frm->frame.w_width == fival->width && |
312 | frame->frm->frame.w_height == fival->height) { |
313 | uframe = frame->frm; |
314 | break; |
315 | } |
316 | } |
317 | if (!uframe) |
318 | return -EINVAL; |
319 | |
320 | if (fival->index >= uframe->frame.b_frame_interval_type) |
321 | return -EINVAL; |
322 | |
323 | fival->discrete.numerator = |
324 | uframe->dw_frame_interval[fival->index]; |
325 | |
326 | /* TODO: handle V4L2_FRMIVAL_TYPE_STEPWISE */ |
327 | fival->type = V4L2_FRMIVAL_TYPE_DISCRETE; |
328 | fival->discrete.denominator = 10000000; |
329 | v4l2_simplify_fraction(numerator: &fival->discrete.numerator, |
330 | denominator: &fival->discrete.denominator, n_terms: 8, threshold: 333); |
331 | |
332 | return 0; |
333 | } |
334 | |
335 | static int |
336 | uvc_v4l2_enum_framesizes(struct file *file, void *fh, |
337 | struct v4l2_frmsizeenum *fsize) |
338 | { |
339 | struct video_device *vdev = video_devdata(file); |
340 | struct uvc_device *uvc = video_get_drvdata(vdev); |
341 | struct uvcg_format *uformat = NULL; |
342 | struct uvcg_frame *uframe = NULL; |
343 | |
344 | uformat = find_format_by_pix(uvc, pixelformat: fsize->pixel_format); |
345 | if (!uformat) |
346 | return -EINVAL; |
347 | |
348 | if (fsize->index >= uformat->num_frames) |
349 | return -EINVAL; |
350 | |
351 | uframe = find_frame_by_index(uvc, uformat, index: fsize->index + 1); |
352 | if (!uframe) |
353 | return -EINVAL; |
354 | |
355 | fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; |
356 | fsize->discrete.width = uframe->frame.w_width; |
357 | fsize->discrete.height = uframe->frame.w_height; |
358 | |
359 | return 0; |
360 | } |
361 | |
362 | static int |
363 | uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f) |
364 | { |
365 | struct video_device *vdev = video_devdata(file); |
366 | struct uvc_device *uvc = video_get_drvdata(vdev); |
367 | const struct uvc_format_desc *fmtdesc; |
368 | struct uvcg_format *uformat; |
369 | |
370 | if (f->index >= uvc->header->num_fmt) |
371 | return -EINVAL; |
372 | |
373 | uformat = find_format_by_index(uvc, index: f->index + 1); |
374 | if (!uformat) |
375 | return -EINVAL; |
376 | |
377 | fmtdesc = to_uvc_format(uformat); |
378 | f->pixelformat = fmtdesc->fcc; |
379 | |
380 | return 0; |
381 | } |
382 | |
383 | static int |
384 | uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b) |
385 | { |
386 | struct video_device *vdev = video_devdata(file); |
387 | struct uvc_device *uvc = video_get_drvdata(vdev); |
388 | struct uvc_video *video = &uvc->video; |
389 | |
390 | if (b->type != video->queue.queue.type) |
391 | return -EINVAL; |
392 | |
393 | return uvcg_alloc_buffers(queue: &video->queue, rb: b); |
394 | } |
395 | |
396 | static int |
397 | uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b) |
398 | { |
399 | struct video_device *vdev = video_devdata(file); |
400 | struct uvc_device *uvc = video_get_drvdata(vdev); |
401 | struct uvc_video *video = &uvc->video; |
402 | |
403 | return uvcg_query_buffer(queue: &video->queue, buf: b); |
404 | } |
405 | |
406 | static int |
407 | uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b) |
408 | { |
409 | struct video_device *vdev = video_devdata(file); |
410 | struct uvc_device *uvc = video_get_drvdata(vdev); |
411 | struct uvc_video *video = &uvc->video; |
412 | int ret; |
413 | |
414 | ret = uvcg_queue_buffer(queue: &video->queue, buf: b); |
415 | if (ret < 0) |
416 | return ret; |
417 | |
418 | if (uvc->state == UVC_STATE_STREAMING) |
419 | queue_work(wq: video->async_wq, work: &video->pump); |
420 | |
421 | return ret; |
422 | } |
423 | |
424 | static int |
425 | uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b) |
426 | { |
427 | struct video_device *vdev = video_devdata(file); |
428 | struct uvc_device *uvc = video_get_drvdata(vdev); |
429 | struct uvc_video *video = &uvc->video; |
430 | |
431 | return uvcg_dequeue_buffer(queue: &video->queue, buf: b, nonblocking: file->f_flags & O_NONBLOCK); |
432 | } |
433 | |
434 | static int |
435 | uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type) |
436 | { |
437 | struct video_device *vdev = video_devdata(file); |
438 | struct uvc_device *uvc = video_get_drvdata(vdev); |
439 | struct uvc_video *video = &uvc->video; |
440 | int ret; |
441 | |
442 | if (type != video->queue.queue.type) |
443 | return -EINVAL; |
444 | |
445 | /* Enable UVC video. */ |
446 | ret = uvcg_video_enable(video); |
447 | if (ret < 0) |
448 | return ret; |
449 | |
450 | /* |
451 | * Complete the alternate setting selection setup phase now that |
452 | * userspace is ready to provide video frames. |
453 | */ |
454 | uvc_function_setup_continue(uvc, disable_ep: 0); |
455 | uvc->state = UVC_STATE_STREAMING; |
456 | |
457 | return 0; |
458 | } |
459 | |
460 | static int |
461 | uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type) |
462 | { |
463 | struct video_device *vdev = video_devdata(file); |
464 | struct uvc_device *uvc = video_get_drvdata(vdev); |
465 | struct uvc_video *video = &uvc->video; |
466 | int ret = 0; |
467 | |
468 | if (type != video->queue.queue.type) |
469 | return -EINVAL; |
470 | |
471 | ret = uvcg_video_disable(video); |
472 | if (ret < 0) |
473 | return ret; |
474 | |
475 | uvc->state = UVC_STATE_CONNECTED; |
476 | uvc_function_setup_continue(uvc, disable_ep: 1); |
477 | return 0; |
478 | } |
479 | |
480 | static int |
481 | uvc_v4l2_subscribe_event(struct v4l2_fh *fh, |
482 | const struct v4l2_event_subscription *sub) |
483 | { |
484 | struct uvc_device *uvc = video_get_drvdata(vdev: fh->vdev); |
485 | struct uvc_file_handle *handle = to_uvc_file_handle(fh); |
486 | int ret; |
487 | |
488 | if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST) |
489 | return -EINVAL; |
490 | |
491 | if (sub->type == UVC_EVENT_SETUP && uvc->func_connected) |
492 | return -EBUSY; |
493 | |
494 | ret = v4l2_event_subscribe(fh, sub, elems: 2, NULL); |
495 | if (ret < 0) |
496 | return ret; |
497 | |
498 | if (sub->type == UVC_EVENT_SETUP) { |
499 | uvc->func_connected = true; |
500 | handle->is_uvc_app_handle = true; |
501 | uvc_function_connect(uvc); |
502 | } |
503 | |
504 | return 0; |
505 | } |
506 | |
507 | static void uvc_v4l2_disable(struct uvc_device *uvc) |
508 | { |
509 | uvc_function_disconnect(uvc); |
510 | uvcg_video_disable(video: &uvc->video); |
511 | uvcg_free_buffers(queue: &uvc->video.queue); |
512 | uvc->func_connected = false; |
513 | wake_up_interruptible(&uvc->func_connected_queue); |
514 | } |
515 | |
516 | static int |
517 | uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh, |
518 | const struct v4l2_event_subscription *sub) |
519 | { |
520 | struct uvc_device *uvc = video_get_drvdata(vdev: fh->vdev); |
521 | struct uvc_file_handle *handle = to_uvc_file_handle(fh); |
522 | int ret; |
523 | |
524 | ret = v4l2_event_unsubscribe(fh, sub); |
525 | if (ret < 0) |
526 | return ret; |
527 | |
528 | if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) { |
529 | uvc_v4l2_disable(uvc); |
530 | handle->is_uvc_app_handle = false; |
531 | } |
532 | |
533 | return 0; |
534 | } |
535 | |
536 | static long |
537 | uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio, |
538 | unsigned int cmd, void *arg) |
539 | { |
540 | struct video_device *vdev = video_devdata(file); |
541 | struct uvc_device *uvc = video_get_drvdata(vdev); |
542 | |
543 | switch (cmd) { |
544 | case UVCIOC_SEND_RESPONSE: |
545 | return uvc_send_response(uvc, data: arg); |
546 | |
547 | default: |
548 | return -ENOIOCTLCMD; |
549 | } |
550 | } |
551 | |
552 | const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = { |
553 | .vidioc_querycap = uvc_v4l2_querycap, |
554 | .vidioc_try_fmt_vid_out = uvc_v4l2_try_format, |
555 | .vidioc_g_fmt_vid_out = uvc_v4l2_get_format, |
556 | .vidioc_s_fmt_vid_out = uvc_v4l2_set_format, |
557 | .vidioc_enum_frameintervals = uvc_v4l2_enum_frameintervals, |
558 | .vidioc_enum_framesizes = uvc_v4l2_enum_framesizes, |
559 | .vidioc_enum_fmt_vid_out = uvc_v4l2_enum_format, |
560 | .vidioc_reqbufs = uvc_v4l2_reqbufs, |
561 | .vidioc_querybuf = uvc_v4l2_querybuf, |
562 | .vidioc_qbuf = uvc_v4l2_qbuf, |
563 | .vidioc_dqbuf = uvc_v4l2_dqbuf, |
564 | .vidioc_streamon = uvc_v4l2_streamon, |
565 | .vidioc_streamoff = uvc_v4l2_streamoff, |
566 | .vidioc_subscribe_event = uvc_v4l2_subscribe_event, |
567 | .vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event, |
568 | .vidioc_default = uvc_v4l2_ioctl_default, |
569 | }; |
570 | |
571 | /* -------------------------------------------------------------------------- |
572 | * V4L2 |
573 | */ |
574 | |
575 | static int |
576 | uvc_v4l2_open(struct file *file) |
577 | { |
578 | struct video_device *vdev = video_devdata(file); |
579 | struct uvc_device *uvc = video_get_drvdata(vdev); |
580 | struct uvc_file_handle *handle; |
581 | |
582 | handle = kzalloc(size: sizeof(*handle), GFP_KERNEL); |
583 | if (handle == NULL) |
584 | return -ENOMEM; |
585 | |
586 | v4l2_fh_init(fh: &handle->vfh, vdev); |
587 | v4l2_fh_add(fh: &handle->vfh); |
588 | |
589 | handle->device = &uvc->video; |
590 | file->private_data = &handle->vfh; |
591 | |
592 | return 0; |
593 | } |
594 | |
595 | static int |
596 | uvc_v4l2_release(struct file *file) |
597 | { |
598 | struct video_device *vdev = video_devdata(file); |
599 | struct uvc_device *uvc = video_get_drvdata(vdev); |
600 | struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); |
601 | struct uvc_video *video = handle->device; |
602 | |
603 | mutex_lock(&video->mutex); |
604 | if (handle->is_uvc_app_handle) |
605 | uvc_v4l2_disable(uvc); |
606 | mutex_unlock(lock: &video->mutex); |
607 | |
608 | file->private_data = NULL; |
609 | v4l2_fh_del(fh: &handle->vfh); |
610 | v4l2_fh_exit(fh: &handle->vfh); |
611 | kfree(objp: handle); |
612 | |
613 | return 0; |
614 | } |
615 | |
616 | static int |
617 | uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) |
618 | { |
619 | struct video_device *vdev = video_devdata(file); |
620 | struct uvc_device *uvc = video_get_drvdata(vdev); |
621 | |
622 | return uvcg_queue_mmap(queue: &uvc->video.queue, vma); |
623 | } |
624 | |
625 | static __poll_t |
626 | uvc_v4l2_poll(struct file *file, poll_table *wait) |
627 | { |
628 | struct video_device *vdev = video_devdata(file); |
629 | struct uvc_device *uvc = video_get_drvdata(vdev); |
630 | |
631 | return uvcg_queue_poll(queue: &uvc->video.queue, file, wait); |
632 | } |
633 | |
634 | #ifndef CONFIG_MMU |
635 | static unsigned long uvcg_v4l2_get_unmapped_area(struct file *file, |
636 | unsigned long addr, unsigned long len, unsigned long pgoff, |
637 | unsigned long flags) |
638 | { |
639 | struct video_device *vdev = video_devdata(file); |
640 | struct uvc_device *uvc = video_get_drvdata(vdev); |
641 | |
642 | return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff); |
643 | } |
644 | #endif |
645 | |
646 | const struct v4l2_file_operations uvc_v4l2_fops = { |
647 | .owner = THIS_MODULE, |
648 | .open = uvc_v4l2_open, |
649 | .release = uvc_v4l2_release, |
650 | .unlocked_ioctl = video_ioctl2, |
651 | .mmap = uvc_v4l2_mmap, |
652 | .poll = uvc_v4l2_poll, |
653 | #ifndef CONFIG_MMU |
654 | .get_unmapped_area = uvcg_v4l2_get_unmapped_area, |
655 | #endif |
656 | }; |
657 | |