[PATCH] uvcvideo: Implement DMABUF exporter role

[Laurent Pinchart]

Now that videobuf2-vmalloc supports exporting buffers, add support for
the DMABUF exporter role by plugging in the videobuf2 ioctl helper.

Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
 drivers/media/usb/uvc/uvc_queue.c | 12 ++++++++++++
 drivers/media/usb/uvc/uvc_v4l2.c  | 13 +++++++++++++
 drivers/media/usb/uvc/uvcvideo.h  |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_queue.c 
b/drivers/media/usb/uvc/uvc_queue.c
index efb9828..61a47bbe 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -272,6 +272,18 @@ int uvc_queue_buffer(struct uvc_video_queue *queue, struct 
v4l2_buffer *buf)
        return ret;
 }
 
+int uvc_export_buffer(struct uvc_video_queue *queue,
+                     struct v4l2_exportbuffer *exp)
+{
+       int ret;
+
+       mutex_lock(&queue->mutex);
+       ret = vb2_expbuf(&queue->queue, exp);
+       mutex_unlock(&queue->mutex);
+
+       return ret;
+}
+
 int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
                       int nonblocking)
 {
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index c4b1ac6..69d0180 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -723,6 +723,18 @@ static int uvc_ioctl_qbuf(struct file *file, void *fh, 
struct v4l2_buffer *buf)
        return uvc_queue_buffer(&stream->queue, buf);
 }
 
+static int uvc_ioctl_expbuf(struct file *file, void *fh,
+                           struct v4l2_exportbuffer *exp)
+{
+       struct uvc_fh *handle = fh;
+       struct uvc_streaming *stream = handle->stream;
+
+       if (!uvc_has_privileges(handle))
+               return -EBUSY;
+
+       return uvc_export_buffer(&stream->queue, exp);
+}
+
 static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer 
*buf)
 {
        struct uvc_fh *handle = fh;
@@ -1478,6 +1490,7 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
        .vidioc_reqbufs = uvc_ioctl_reqbufs,
        .vidioc_querybuf = uvc_ioctl_querybuf,
        .vidioc_qbuf = uvc_ioctl_qbuf,
+       .vidioc_expbuf = uvc_ioctl_expbuf,
        .vidioc_dqbuf = uvc_ioctl_dqbuf,
        .vidioc_create_bufs = uvc_ioctl_create_bufs,
        .vidioc_streamon = uvc_ioctl_streamon,
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 2bd895c..180efb2 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -641,6 +641,8 @@ 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_export_buffer(struct uvc_video_queue *queue,
+               struct v4l2_exportbuffer *exp);
 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
                struct v4l2_buffer *v4l2_buf, int nonblocking);
 extern int uvc_queue_streamon(struct uvc_video_queue *queue,
-- 
2.0.5

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