[media] V4L: Add s_rx_buffer subdev video operation

The s_rx_buffer callback allows the host to set buffer for a data being
received by the subdev, e.g. non-image frame (meta) data. This callback
can be implemented by subdevice like a MIPI CSI2 receiver, allowing the
host driver to gather additional data into frame buffer passed to user
space.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 2ecd7377153bb9bf7dbf5f5706466c6bf42bfdbf..abf1a0e5033356ab1f6578153d5a435c375c3aa0 100644 (file)
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -274,6 +274,10 @@ struct v4l2_subdev_audio_ops {
    s_mbus_config: set a certain mediabus configuration. This operation is added
        for compatibility with soc-camera drivers and should not be used by new
        software.
+
+   s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
+       can adjust @size to a lower value and must not write more data to the
+       buffer starting at @data than the original value of @size.
  */
 struct v4l2_subdev_video_ops {
        int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
@@ -327,6 +331,8 @@ struct v4l2_subdev_video_ops {
                             struct v4l2_mbus_config *cfg);
        int (*s_mbus_config)(struct v4l2_subdev *sd,
                             const struct v4l2_mbus_config *cfg);
+       int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
+                          unsigned int *size);
 };
 
 /*