From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
This patch enables the ioctl to create additional buffers on the
videobuf2 capture queue.
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
[laurent.pinchart@xxxxxxxxxxxxxxxx: Acquire privileges instead of just
checking them in VIDIOC_CREATE_BUFS implementation]
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/usb/uvc/uvc_queue.c | 12 ++++++++++++
drivers/media/usb/uvc/uvc_v4l2.c | 11 +++++++++++
drivers/media/usb/uvc/uvcvideo.h | 2 ++
3 files changed, 25 insertions(+)
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index d46dd70..ff7be97 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -198,6 +198,18 @@ int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
return ret;
}
+int uvc_create_buffers(struct uvc_video_queue *queue,
+ struct v4l2_create_buffers *cb)
+{
+ int ret;
+
+ mutex_lock(&queue->mutex);
+ ret = vb2_create_bufs(&queue->queue, cb);
+ mutex_unlock(&queue->mutex);
+
+ return ret;
+}
+
int uvc_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
{
int ret;
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 3afff92..378ae02 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1000,6 +1000,17 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
return uvc_query_buffer(&stream->queue, buf);
}
+ case VIDIOC_CREATE_BUFS:
+ {
+ struct v4l2_create_buffers *cb = arg;
+
+ ret = uvc_acquire_privileges(handle);
+ if (ret < 0)
+ return ret;
+
+ return uvc_create_buffers(&stream->queue, cb);
+ }
+
case VIDIOC_QBUF:
if (!uvc_has_privileges(handle))
return -EBUSY;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 6173632..143d5e5 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -614,6 +614,8 @@ extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
extern void uvc_free_buffers(struct uvc_video_queue *queue);
extern int uvc_query_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf);
+extern int uvc_create_buffers(struct uvc_video_queue *queue,
+ struct v4l2_create_buffers *v4l2_cb);
extern int uvc_queue_buffer(struct uvc_video_queue *queue,
struct v4l2_buffer *v4l2_buf);
extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
--
1.8.3.2
--
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