1 // SPDX-License-Identifier: GPL-2.0+
3  *	uvc_v4l2.c  --  USB Video Class Gadget driver
5  *	Copyright (C) 2009-2010
19 #include <media/v4l2-dev.h>
20 #include <media/v4l2-event.h>
21 #include <media/v4l2-ioctl.h>
36 	if (uformat->type == UVCG_UNCOMPRESSED) {  in to_uvc_format()
37 		unc = to_uvcg_uncompressed(&uformat->group.cg_item);  in to_uvc_format()
39 			return ERR_PTR(-EINVAL);  in to_uvc_format()
41 		memcpy(guid, unc->desc.guidFormat, sizeof(guid));  in to_uvc_format()
46 		return ERR_PTR(-EINVAL);  in to_uvc_format()
56 	if (uformat->type == UVCG_UNCOMPRESSED) {  in uvc_v4l2_get_bytesperline()
57 		u = to_uvcg_uncompressed(&uformat->group.cg_item);  in uvc_v4l2_get_bytesperline()
61 		return u->desc.bBitsPerPixel * uframe->frame.w_width / 8;  in uvc_v4l2_get_bytesperline()
72 	return bpl ? bpl * uframe->frame.w_height :  in uvc_get_frame_size()
73 		uframe->frame.dw_max_video_frame_buffer_size;  in uvc_get_frame_size()
82 	list_for_each_entry(format, &uvc->header->formats, entry) {  in find_format_by_index()
84 			uformat = format->fmt;  in find_format_by_index()
98 	struct uvcg_frame_ptr *frame;  in find_frame_by_index()  local
101 	list_for_each_entry(format, &uvc->header->formats, entry) {  in find_frame_by_index()
102 		if (format->fmt->type != uformat->type)  in find_frame_by_index()
104 		list_for_each_entry(frame, &format->fmt->frames, entry) {  in find_frame_by_index()
105 			if (index == frame->frm->frame.b_frame_index) {  in find_frame_by_index()
106 				uframe = frame->frm;  in find_frame_by_index()
121 	list_for_each_entry(format, &uvc->header->formats, entry) {  in find_format_by_pix()
122 		const struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);  in find_format_by_pix()
127 		if (fmtdesc->fcc == pixelformat) {  in find_format_by_pix()
128 			uformat = format->fmt;  in find_format_by_pix()
140 	struct uvc_video *video = &uvc->video;  in find_closest_frame_by_size()
142 	struct uvcg_frame_ptr *frame;  in find_closest_frame_by_size()  local
147 	 * the size in pixels of the non-overlapping regions between the  in find_closest_frame_by_size()
148 	 * requested size and the frame-specified size.  in find_closest_frame_by_size()
150 	maxd = (unsigned int)-1;  in find_closest_frame_by_size()
152 	list_for_each_entry(format, &uvc->header->formats, entry) {  in find_closest_frame_by_size()
153 		if (format->fmt->type != uformat->type)  in find_closest_frame_by_size()
156 		list_for_each_entry(frame, &format->fmt->frames, entry) {  in find_closest_frame_by_size()
159 			w = frame->frm->frame.w_width;  in find_closest_frame_by_size()
160 			h = frame->frm->frame.w_height;  in find_closest_frame_by_size()
163 			d = w*h + rw*rh - 2*d;  in find_closest_frame_by_size()
166 				uframe = frame->frm;  in find_closest_frame_by_size()
175 		uvcg_dbg(&video->uvc->func, "Unsupported size %ux%u\n", rw, rh);  in find_closest_frame_by_size()
180 /* --------------------------------------------------------------------------
187 	struct usb_composite_dev *cdev = uvc->func.config->cdev;  in uvc_send_response()
188 	struct usb_request *req = uvc->control_req;  in uvc_send_response()
190 	if (data->length < 0)  in uvc_send_response()
191 		return usb_ep_set_halt(cdev->gadget->ep0);  in uvc_send_response()
193 	req->length = min_t(unsigned int, uvc->event_length, data->length);  in uvc_send_response()
194 	req->zero = data->length < uvc->event_length;  in uvc_send_response()
196 	memcpy(req->buf, data->data, req->length);  in uvc_send_response()
198 	return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);  in uvc_send_response()
201 /* --------------------------------------------------------------------------
210 	struct usb_composite_dev *cdev = uvc->func.config->cdev;  in uvc_v4l2_querycap()
212 	strscpy(cap->driver, "g_uvc", sizeof(cap->driver));  in uvc_v4l2_querycap()
213 	strscpy(cap->card, cdev->gadget->name, sizeof(cap->card));  in uvc_v4l2_querycap()
214 	strscpy(cap->bus_info, dev_name(&cdev->gadget->dev),  in uvc_v4l2_querycap()
215 		sizeof(cap->bus_info));  in uvc_v4l2_querycap()
224 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_get_format()
226 	fmt->fmt.pix.pixelformat = video->fcc;  in uvc_v4l2_get_format()
227 	fmt->fmt.pix.width = video->width;  in uvc_v4l2_get_format()
228 	fmt->fmt.pix.height = video->height;  in uvc_v4l2_get_format()
229 	fmt->fmt.pix.field = V4L2_FIELD_NONE;  in uvc_v4l2_get_format()
230 	fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;  in uvc_v4l2_get_format()
231 	fmt->fmt.pix.sizeimage = video->imagesize;  in uvc_v4l2_get_format()
232 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;  in uvc_v4l2_get_format()
233 	fmt->fmt.pix.priv = 0;  in uvc_v4l2_get_format()
243 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_try_format()
249 	if (fmt->type != video->queue.queue.type)  in uvc_v4l2_try_format()
250 		return -EINVAL;  in uvc_v4l2_try_format()
252 	fcc = (u8 *)&fmt->fmt.pix.pixelformat;  in uvc_v4l2_try_format()
253 	uvcg_dbg(&uvc->func, "Trying format 0x%08x (%c%c%c%c): %ux%u\n",  in uvc_v4l2_try_format()
254 		fmt->fmt.pix.pixelformat,  in uvc_v4l2_try_format()
256 		fmt->fmt.pix.width, fmt->fmt.pix.height);  in uvc_v4l2_try_format()
258 	uformat = find_format_by_pix(uvc, fmt->fmt.pix.pixelformat);  in uvc_v4l2_try_format()
260 		return -EINVAL;  in uvc_v4l2_try_format()
263 				fmt->fmt.pix.width, fmt->fmt.pix.height);  in uvc_v4l2_try_format()
265 		return -EINVAL;  in uvc_v4l2_try_format()
267 	if (uformat->type == UVCG_UNCOMPRESSED) {  in uvc_v4l2_try_format()
269 			to_uvcg_uncompressed(&uformat->group.cg_item);  in uvc_v4l2_try_format()
273 		v4l2_fill_pixfmt(&fmt->fmt.pix, fmt->fmt.pix.pixelformat,  in uvc_v4l2_try_format()
274 				 uframe->frame.w_width, uframe->frame.w_height);  in uvc_v4l2_try_format()
276 		if (fmt->fmt.pix.sizeimage != (uvc_v4l2_get_bytesperline(uformat, uframe) *  in uvc_v4l2_try_format()
277 						uframe->frame.w_height))  in uvc_v4l2_try_format()
278 			return -EINVAL;  in uvc_v4l2_try_format()
280 		fmt->fmt.pix.width = uframe->frame.w_width;  in uvc_v4l2_try_format()
281 		fmt->fmt.pix.height = uframe->frame.w_height;  in uvc_v4l2_try_format()
282 		fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);  in uvc_v4l2_try_format()
283 		fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);  in uvc_v4l2_try_format()
287 		fmt->fmt.pix.pixelformat = fmtdesc->fcc;  in uvc_v4l2_try_format()
289 	fmt->fmt.pix.field = V4L2_FIELD_NONE;  in uvc_v4l2_try_format()
290 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;  in uvc_v4l2_try_format()
291 	fmt->fmt.pix.priv = 0;  in uvc_v4l2_try_format()
301 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_set_format()
308 	video->fcc = fmt->fmt.pix.pixelformat;  in uvc_v4l2_set_format()
309 	video->bpp = fmt->fmt.pix.bytesperline * 8 / video->width;  in uvc_v4l2_set_format()
310 	video->width = fmt->fmt.pix.width;  in uvc_v4l2_set_format()
311 	video->height = fmt->fmt.pix.height;  in uvc_v4l2_set_format()
312 	video->imagesize = fmt->fmt.pix.sizeimage;  in uvc_v4l2_set_format()
325 	struct uvcg_frame_ptr *frame;  in uvc_v4l2_enum_frameintervals()  local
327 	uformat = find_format_by_pix(uvc, fival->pixel_format);  in uvc_v4l2_enum_frameintervals()
329 		return -EINVAL;  in uvc_v4l2_enum_frameintervals()
331 	list_for_each_entry(frame, &uformat->frames, entry) {  in uvc_v4l2_enum_frameintervals()
332 		if (frame->frm->frame.w_width == fival->width &&  in uvc_v4l2_enum_frameintervals()
333 		    frame->frm->frame.w_height == fival->height) {  in uvc_v4l2_enum_frameintervals()
334 			uframe = frame->frm;  in uvc_v4l2_enum_frameintervals()
339 		return -EINVAL;  in uvc_v4l2_enum_frameintervals()
341 	if (fival->index >= uframe->frame.b_frame_interval_type)  in uvc_v4l2_enum_frameintervals()
342 		return -EINVAL;  in uvc_v4l2_enum_frameintervals()
344 	fival->discrete.numerator =  in uvc_v4l2_enum_frameintervals()
345 		uframe->dw_frame_interval[fival->index];  in uvc_v4l2_enum_frameintervals()
348 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;  in uvc_v4l2_enum_frameintervals()
349 	fival->discrete.denominator = 10000000;  in uvc_v4l2_enum_frameintervals()
350 	v4l2_simplify_fraction(&fival->discrete.numerator,  in uvc_v4l2_enum_frameintervals()
351 		&fival->discrete.denominator, 8, 333);  in uvc_v4l2_enum_frameintervals()
365 	uformat = find_format_by_pix(uvc, fsize->pixel_format);  in uvc_v4l2_enum_framesizes()
367 		return -EINVAL;  in uvc_v4l2_enum_framesizes()
369 	if (fsize->index >= uformat->num_frames)  in uvc_v4l2_enum_framesizes()
370 		return -EINVAL;  in uvc_v4l2_enum_framesizes()
372 	uframe = find_frame_by_index(uvc, uformat, fsize->index + 1);  in uvc_v4l2_enum_framesizes()
374 		return -EINVAL;  in uvc_v4l2_enum_framesizes()
376 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;  in uvc_v4l2_enum_framesizes()
377 	fsize->discrete.width = uframe->frame.w_width;  in uvc_v4l2_enum_framesizes()
378 	fsize->discrete.height = uframe->frame.w_height;  in uvc_v4l2_enum_framesizes()
391 	if (f->index >= uvc->header->num_fmt)  in uvc_v4l2_enum_format()
392 		return -EINVAL;  in uvc_v4l2_enum_format()
394 	uformat = find_format_by_index(uvc, f->index + 1);  in uvc_v4l2_enum_format()
396 		return -EINVAL;  in uvc_v4l2_enum_format()
402 	f->pixelformat = fmtdesc->fcc;  in uvc_v4l2_enum_format()
412 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_reqbufs()
414 	if (b->type != video->queue.queue.type)  in uvc_v4l2_reqbufs()
415 		return -EINVAL;  in uvc_v4l2_reqbufs()
417 	return uvcg_alloc_buffers(&video->queue, b);  in uvc_v4l2_reqbufs()
425 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_querybuf()
427 	return uvcg_query_buffer(&video->queue, b);  in uvc_v4l2_querybuf()
435 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_qbuf()
438 	ret = uvcg_queue_buffer(&video->queue, b);  in uvc_v4l2_qbuf()
442 	if (uvc->state == UVC_STATE_STREAMING)  in uvc_v4l2_qbuf()
443 		queue_work(video->async_wq, &video->pump);  in uvc_v4l2_qbuf()
453 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_dqbuf()
455 	return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);  in uvc_v4l2_dqbuf()
463 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_streamon()
466 	if (type != video->queue.queue.type)  in uvc_v4l2_streamon()
467 		return -EINVAL;  in uvc_v4l2_streamon()
479 	uvc->state = UVC_STATE_STREAMING;  in uvc_v4l2_streamon()
489 	struct uvc_video *video = &uvc->video;  in uvc_v4l2_streamoff()
492 	if (type != video->queue.queue.type)  in uvc_v4l2_streamoff()
493 		return -EINVAL;  in uvc_v4l2_streamoff()
499 	uvc->state = UVC_STATE_CONNECTED;  in uvc_v4l2_streamoff()
506 			 const struct v4l2_event_subscription *sub)  in uvc_v4l2_subscribe_event()  argument
508 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);  in uvc_v4l2_subscribe_event()
512 	if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)  in uvc_v4l2_subscribe_event()
513 		return -EINVAL;  in uvc_v4l2_subscribe_event()
515 	if (sub->type == UVC_EVENT_SETUP && uvc->func_connected)  in uvc_v4l2_subscribe_event()
516 		return -EBUSY;  in uvc_v4l2_subscribe_event()
518 	ret = v4l2_event_subscribe(fh, sub, 2, NULL);  in uvc_v4l2_subscribe_event()
522 	if (sub->type == UVC_EVENT_SETUP) {  in uvc_v4l2_subscribe_event()
523 		uvc->func_connected = true;  in uvc_v4l2_subscribe_event()
524 		handle->is_uvc_app_handle = true;  in uvc_v4l2_subscribe_event()
534 	uvcg_video_disable(&uvc->video);  in uvc_v4l2_disable()
535 	uvcg_free_buffers(&uvc->video.queue);  in uvc_v4l2_disable()
536 	uvc->func_connected = false;  in uvc_v4l2_disable()
537 	wake_up_interruptible(&uvc->func_connected_queue);  in uvc_v4l2_disable()
542 			   const struct v4l2_event_subscription *sub)  in uvc_v4l2_unsubscribe_event()  argument
544 	struct uvc_device *uvc = video_get_drvdata(fh->vdev);  in uvc_v4l2_unsubscribe_event()
548 	ret = v4l2_event_unsubscribe(fh, sub);  in uvc_v4l2_unsubscribe_event()
552 	if (sub->type == UVC_EVENT_SETUP && handle->is_uvc_app_handle) {  in uvc_v4l2_unsubscribe_event()
554 		handle->is_uvc_app_handle = false;  in uvc_v4l2_unsubscribe_event()
572 		return -ENOIOCTLCMD;  in uvc_v4l2_ioctl_default()
595 /* --------------------------------------------------------------------------
608 		return -ENOMEM;  in uvc_v4l2_open()
610 	v4l2_fh_init(&handle->vfh, vdev);  in uvc_v4l2_open()
611 	v4l2_fh_add(&handle->vfh);  in uvc_v4l2_open()
613 	handle->device = &uvc->video;  in uvc_v4l2_open()
614 	file->private_data = &handle->vfh;  in uvc_v4l2_open()
624 	struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);  in uvc_v4l2_release()
625 	struct uvc_video *video = handle->device;  in uvc_v4l2_release()
627 	mutex_lock(&video->mutex);  in uvc_v4l2_release()
628 	if (handle->is_uvc_app_handle)  in uvc_v4l2_release()
630 	mutex_unlock(&video->mutex);  in uvc_v4l2_release()
632 	file->private_data = NULL;  in uvc_v4l2_release()
633 	v4l2_fh_del(&handle->vfh);  in uvc_v4l2_release()
634 	v4l2_fh_exit(&handle->vfh);  in uvc_v4l2_release()
646 	return uvcg_queue_mmap(&uvc->video.queue, vma);  in uvc_v4l2_mmap()
655 	return uvcg_queue_poll(&uvc->video.queue, file, wait);  in uvc_v4l2_poll()
666 	return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);  in uvcg_v4l2_get_unmapped_area()