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[media] uvcvideo: Implement vb2 queue start and stop stream operations 

To work propertly the videobuf2 core code needs to be in charge of
stream start/stop control. Implement the start_streaming and
stop_streaming vb2 operations and move video enable/disable code to
them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Laurent Pinchart 2014-10-21 13:03:08 -03:00 committed by Mauro Carvalho Chehab
parent bc75d5a009
commit a11a03e50b
2 changed files with 28 additions and 25 deletions
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43
drivers/media/usb/uvc/uvc_queue.c
View File

@ -135,6 +135,29 @@ static void uvc_wait_finish(struct vb2_queue *vq)
mutex_lock(&queue->mutex);
}
static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
queue->buf_used = 0;
return uvc_video_enable(stream, 1);
}
static void uvc_stop_streaming(struct vb2_queue *vq)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
unsigned long flags;
uvc_video_enable(stream, 0);
spin_lock_irqsave(&queue->irqlock, flags);
INIT_LIST_HEAD(&queue->irqqueue);
spin_unlock_irqrestore(&queue->irqlock, flags);
}
static struct vb2_ops uvc_queue_qops = {
.queue_setup = uvc_queue_setup,
.buf_prepare = uvc_buffer_prepare,
@ -142,6 +165,8 @@ static struct vb2_ops uvc_queue_qops = {
.buf_finish = uvc_buffer_finish,
.wait_prepare = uvc_wait_prepare,
.wait_finish = uvc_wait_finish,
.start_streaming = uvc_start_streaming,
.stop_streaming = uvc_stop_streaming,
};
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
@ -310,27 +335,15 @@ int uvc_queue_allocated(struct uvc_video_queue *queue)
*/
int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
{
unsigned long flags;
int ret;
mutex_lock(&queue->mutex);
if (enable) {
if (enable)
ret = vb2_streamon(&queue->queue, queue->queue.type);
if (ret < 0)
goto done;
queue->buf_used = 0;
} else {
else
ret = vb2_streamoff(&queue->queue, queue->queue.type);
if (ret < 0)
goto done;
spin_lock_irqsave(&queue->irqlock, flags);
INIT_LIST_HEAD(&queue->irqqueue);
spin_unlock_irqrestore(&queue->irqlock, flags);
}
done:
mutex_unlock(&queue->mutex);
return ret;
}

10
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -531,7 +531,6 @@ static int uvc_v4l2_release(struct file *file)
/* Only free resources if this is a privileged handle. */
if (uvc_has_privileges(handle)) {
uvc_video_enable(stream, 0);
uvc_queue_enable(&stream->queue, 0);
uvc_free_buffers(&stream->queue);
}
@ -768,14 +767,6 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
mutex_lock(&stream->mutex);
ret = uvc_queue_enable(&stream->queue, 1);
if (ret < 0)
goto done;
ret = uvc_video_enable(stream, 1);
if (ret < 0)
uvc_queue_enable(&stream->queue, 0);
done:
mutex_unlock(&stream->mutex);
return ret;
@ -794,7 +785,6 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
return -EBUSY;
mutex_lock(&stream->mutex);
uvc_video_enable(stream, 0);
uvc_queue_enable(&stream->queue, 0);
mutex_unlock(&stream->mutex);