[media] v4l: add buffer exporting via dmabuf

This patch adds extension to V4L2 api. A new ioctl VIDIOC_EXPBUF is added.  The
ioctl is used to export an mmap buffer as a DMABUF file descriptor.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index e48b571ca37d..4118ad1324c9 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -111,6 +111,8 @@ struct v4l2_ioctl_ops {
         int (*vidioc_reqbufs) (struct file *file, void *fh, struct v4l2_requestbuffers *b);
         int (*vidioc_querybuf)(struct file *file, void *fh, struct v4l2_buffer *b);
         int (*vidioc_qbuf)    (struct file *file, void *fh, struct v4l2_buffer *b);
+        int (*vidioc_expbuf)  (struct file *file, void *fh,
+                                struct v4l2_exportbuffer *e);
         int (*vidioc_dqbuf)   (struct file *file, void *fh, struct v4l2_buffer *b);
 
         int (*vidioc_create_bufs)(struct file *file, void *fh, struct v4l2_create_buffers *b);