// SPDX-License-Identifier: GPL-2.0+
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/*
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* uvc_video.c -- USB Video Class Gadget driver
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*
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* Copyright (C) 2009-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/video.h>
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#include <linux/pm_qos.h>
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#include <media/v4l2-dev.h>
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#include "uvc.h"
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#include "uvc_queue.h"
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#include "uvc_video.h"
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#include "u_uvc.h"
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#if defined(CONFIG_ARCH_ROCKCHIP) && defined(CONFIG_NO_GKI)
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static bool uvc_using_zero_copy(struct uvc_video *video)
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{
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struct uvc_device *uvc = container_of(video, struct uvc_device, video);
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struct f_uvc_opts *opts = fi_to_f_uvc_opts(uvc->func.fi);
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if (opts && opts->uvc_zero_copy && video->fcc != V4L2_PIX_FMT_YUYV)
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return true;
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else
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return false;
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}
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static void uvc_wait_req_complete(struct uvc_video *video, struct uvc_request *ureq)
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{
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unsigned long flags;
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struct usb_request *req;
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int ret;
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spin_lock_irqsave(&video->req_lock, flags);
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list_for_each_entry(req, &video->req_free, list) {
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if (req == ureq->req)
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break;
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}
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if (req != ureq->req) {
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reinit_completion(&ureq->req_done);
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spin_unlock_irqrestore(&video->req_lock, flags);
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ret = wait_for_completion_timeout(&ureq->req_done,
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msecs_to_jiffies(500));
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if (ret == 0)
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uvcg_warn(&video->uvc->func,
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"timed out waiting for req done\n");
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return;
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}
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spin_unlock_irqrestore(&video->req_lock, flags);
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}
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#else
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static inline bool uvc_using_zero_copy(struct uvc_video *video)
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{
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return false;
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}
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static inline void uvc_wait_req_complete(struct uvc_video *video, struct uvc_request *ureq)
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{ }
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#endif
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/* --------------------------------------------------------------------------
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* Video codecs
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*/
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static int
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uvc_video_encode_header(struct uvc_video *video, struct uvc_buffer *buf,
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u8 *data, int len)
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{
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if (uvc_using_zero_copy(video)) {
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u8 *mem;
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mem = buf->mem + video->queue.buf_used +
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(video->queue.buf_used / (video->req_size - 2)) * 2;
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mem[0] = 2;
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mem[1] = UVC_STREAM_EOH | video->fid;
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if (buf->bytesused - video->queue.buf_used <= len - 2)
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mem[1] |= UVC_STREAM_EOF;
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return 2;
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}
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data[0] = 2;
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data[1] = UVC_STREAM_EOH | video->fid;
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if (buf->bytesused - video->queue.buf_used <= len - 2)
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data[1] |= UVC_STREAM_EOF;
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return 2;
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}
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static int
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uvc_video_encode_data(struct uvc_video *video, struct uvc_buffer *buf,
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u8 *data, int len)
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{
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struct uvc_video_queue *queue = &video->queue;
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unsigned int nbytes;
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void *mem;
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/* Copy video data to the USB buffer. */
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mem = buf->mem + queue->buf_used;
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nbytes = min((unsigned int)len, buf->bytesused - queue->buf_used);
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if (!uvc_using_zero_copy(video))
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memcpy(data, mem, nbytes);
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queue->buf_used += nbytes;
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return nbytes;
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}
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static void
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uvc_video_encode_bulk(struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf)
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{
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void *mem = req->buf;
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int len = video->req_size;
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int ret;
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/* Add a header at the beginning of the payload. */
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if (video->payload_size == 0) {
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ret = uvc_video_encode_header(video, buf, mem, len);
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video->payload_size += ret;
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mem += ret;
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len -= ret;
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}
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/* Process video data. */
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len = min((int)(video->max_payload_size - video->payload_size), len);
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ret = uvc_video_encode_data(video, buf, mem, len);
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video->payload_size += ret;
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len -= ret;
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req->length = video->req_size - len;
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req->zero = video->payload_size == video->max_payload_size;
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if (buf->bytesused == video->queue.buf_used) {
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video->queue.buf_used = 0;
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buf->state = UVC_BUF_STATE_DONE;
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uvcg_queue_next_buffer(&video->queue, buf);
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video->fid ^= UVC_STREAM_FID;
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video->payload_size = 0;
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req->zero = 1;
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}
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if (video->payload_size == video->max_payload_size ||
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buf->bytesused == video->queue.buf_used)
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video->payload_size = 0;
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}
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static void
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uvc_video_encode_isoc(struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf)
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{
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void *mem = req->buf;
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int len = video->req_size;
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int ret;
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if (uvc_using_zero_copy(video))
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req->buf = buf->mem + video->queue.buf_used +
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(video->queue.buf_used / (video->req_size - 2)) * 2;
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/* Add the header. */
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ret = uvc_video_encode_header(video, buf, mem, len);
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mem += ret;
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len -= ret;
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/* Process video data. */
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ret = uvc_video_encode_data(video, buf, mem, len);
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len -= ret;
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req->length = video->req_size - len;
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if (buf->bytesused == video->queue.buf_used) {
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video->queue.buf_used = 0;
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buf->state = UVC_BUF_STATE_DONE;
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uvcg_queue_next_buffer(&video->queue, buf);
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video->fid ^= UVC_STREAM_FID;
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}
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}
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/* --------------------------------------------------------------------------
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* Request handling
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*/
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static int uvcg_video_ep_queue(struct uvc_video *video, struct usb_request *req)
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{
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int ret;
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ret = usb_ep_queue(video->ep, req, GFP_ATOMIC);
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if (ret < 0) {
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uvcg_err(&video->uvc->func, "Failed to queue request (%d).\n",
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ret);
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/* If the endpoint is disabled the descriptor may be NULL. */
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if (video->ep->desc) {
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/* Isochronous endpoints can't be halted. */
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if (usb_endpoint_xfer_bulk(video->ep->desc))
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usb_ep_set_halt(video->ep);
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}
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}
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return ret;
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}
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static void
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uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct uvc_request *ureq = req->context;
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struct uvc_video *video = ureq->video;
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struct uvc_video_queue *queue = &video->queue;
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struct uvc_device *uvc = video->uvc;
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unsigned long flags;
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switch (req->status) {
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case 0:
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break;
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case -ESHUTDOWN: /* disconnect from host. */
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uvcg_dbg(&video->uvc->func, "VS request cancelled.\n");
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uvcg_queue_cancel(queue, 1);
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break;
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default:
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uvcg_warn(&video->uvc->func,
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"VS request completed with status %d.\n",
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req->status);
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uvcg_queue_cancel(queue, 0);
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}
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spin_lock_irqsave(&video->req_lock, flags);
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list_add_tail(&req->list, &video->req_free);
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#if defined(CONFIG_ARCH_ROCKCHIP) && defined(CONFIG_NO_GKI)
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complete(&ureq->req_done);
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#endif
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spin_unlock_irqrestore(&video->req_lock, flags);
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if (uvc->state == UVC_STATE_STREAMING)
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schedule_work(&video->pump);
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}
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static int
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uvc_video_free_requests(struct uvc_video *video)
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{
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unsigned int i;
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if (video->ureq) {
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for (i = 0; i < video->uvc_num_requests; ++i) {
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if (video->ureq[i].req) {
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uvc_wait_req_complete(video, &video->ureq[i]);
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usb_ep_free_request(video->ep, video->ureq[i].req);
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video->ureq[i].req = NULL;
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}
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if (video->ureq[i].req_buffer) {
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kfree(video->ureq[i].req_buffer);
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video->ureq[i].req_buffer = NULL;
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}
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}
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kfree(video->ureq);
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video->ureq = NULL;
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}
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INIT_LIST_HEAD(&video->req_free);
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video->req_size = 0;
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return 0;
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}
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static int
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uvc_video_alloc_requests(struct uvc_video *video)
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{
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unsigned int req_size;
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unsigned int i;
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int ret = -ENOMEM;
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BUG_ON(video->req_size);
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if (!usb_endpoint_xfer_bulk(video->ep->desc)) {
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req_size = video->ep->maxpacket
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* max_t(unsigned int, video->ep->maxburst, 1)
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* (video->ep->mult);
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} else {
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req_size = video->ep->maxpacket
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* max_t(unsigned int, video->ep->maxburst, 1);
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}
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video->ureq = kcalloc(video->uvc_num_requests, sizeof(struct uvc_request), GFP_KERNEL);
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if (video->ureq == NULL)
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return -ENOMEM;
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for (i = 0; i < video->uvc_num_requests; ++i) {
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video->ureq[i].req_buffer = kmalloc(req_size, GFP_KERNEL);
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if (video->ureq[i].req_buffer == NULL)
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goto error;
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video->ureq[i].req = usb_ep_alloc_request(video->ep, GFP_KERNEL);
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if (video->ureq[i].req == NULL)
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goto error;
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video->ureq[i].req->buf = video->ureq[i].req_buffer;
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video->ureq[i].req->length = 0;
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video->ureq[i].req->complete = uvc_video_complete;
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video->ureq[i].req->context = &video->ureq[i];
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video->ureq[i].video = video;
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#if defined(CONFIG_ARCH_ROCKCHIP) && defined(CONFIG_NO_GKI)
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init_completion(&video->ureq[i].req_done);
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#endif
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list_add_tail(&video->ureq[i].req->list, &video->req_free);
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}
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video->req_size = req_size;
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return 0;
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error:
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uvc_video_free_requests(video);
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return ret;
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}
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/* --------------------------------------------------------------------------
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* Video streaming
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*/
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/*
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* uvcg_video_pump - Pump video data into the USB requests
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*
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* This function fills the available USB requests (listed in req_free) with
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* video data from the queued buffers.
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*/
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static void uvcg_video_pump(struct work_struct *work)
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{
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struct uvc_video *video = container_of(work, struct uvc_video, pump);
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struct uvc_video_queue *queue = &video->queue;
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struct usb_request *req = NULL;
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struct uvc_buffer *buf;
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unsigned long flags;
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int ret;
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while (video->ep->enabled) {
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/* Retrieve the first available USB request, protected by the
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* request lock.
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*/
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spin_lock_irqsave(&video->req_lock, flags);
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if (list_empty(&video->req_free)) {
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spin_unlock_irqrestore(&video->req_lock, flags);
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return;
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}
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req = list_first_entry(&video->req_free, struct usb_request,
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list);
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list_del(&req->list);
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spin_unlock_irqrestore(&video->req_lock, flags);
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/* Retrieve the first available video buffer and fill the
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* request, protected by the video queue irqlock.
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*/
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spin_lock_irqsave(&queue->irqlock, flags);
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buf = uvcg_queue_head(queue);
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if (buf == NULL) {
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spin_unlock_irqrestore(&queue->irqlock, flags);
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break;
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}
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video->encode(req, video, buf);
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/* Queue the USB request */
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ret = uvcg_video_ep_queue(video, req);
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spin_unlock_irqrestore(&queue->irqlock, flags);
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if (ret < 0) {
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uvcg_queue_cancel(queue, 0);
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break;
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}
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/* Endpoint now owns the request */
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req = NULL;
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}
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if (!req)
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return;
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spin_lock_irqsave(&video->req_lock, flags);
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list_add_tail(&req->list, &video->req_free);
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spin_unlock_irqrestore(&video->req_lock, flags);
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return;
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}
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/*
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* Enable or disable the video stream.
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*/
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int uvcg_video_enable(struct uvc_video *video, int enable)
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{
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unsigned int i;
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int ret;
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struct uvc_device *uvc;
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struct f_uvc_opts *opts;
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if (video->ep == NULL) {
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uvcg_info(&video->uvc->func,
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"Video enable failed, device is uninitialized.\n");
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return -ENODEV;
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}
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uvc = container_of(video, struct uvc_device, video);
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opts = fi_to_f_uvc_opts(uvc->func.fi);
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if (!enable) {
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cancel_work_sync(&video->pump);
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uvcg_queue_cancel(&video->queue, 0);
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for (i = 0; i < video->uvc_num_requests; ++i)
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if (video->ureq && video->ureq[i].req)
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usb_ep_dequeue(video->ep, video->ureq[i].req);
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uvc_video_free_requests(video);
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uvcg_queue_enable(&video->queue, 0);
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if (cpu_latency_qos_request_active(&uvc->pm_qos))
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cpu_latency_qos_remove_request(&uvc->pm_qos);
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return 0;
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}
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cpu_latency_qos_add_request(&uvc->pm_qos, opts->pm_qos_latency);
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if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)
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return ret;
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if ((ret = uvc_video_alloc_requests(video)) < 0)
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return ret;
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if (video->max_payload_size) {
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video->encode = uvc_video_encode_bulk;
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video->payload_size = 0;
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} else
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video->encode = uvc_video_encode_isoc;
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schedule_work(&video->pump);
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return ret;
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}
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/*
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* Initialize the UVC video stream.
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*/
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int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
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{
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INIT_LIST_HEAD(&video->req_free);
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spin_lock_init(&video->req_lock);
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INIT_WORK(&video->pump, uvcg_video_pump);
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video->uvc = uvc;
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video->fcc = V4L2_PIX_FMT_YUYV;
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video->bpp = 16;
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video->width = 320;
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video->height = 240;
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video->imagesize = 320 * 240 * 2;
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/* Initialize the video buffers queue. */
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uvcg_queue_init(&video->queue, V4L2_BUF_TYPE_VIDEO_OUTPUT,
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&video->mutex);
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return 0;
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}
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