v4l2_subdev_get_unlocked_active_state
s_state = v4l2_subdev_get_unlocked_active_state(s_sd);
sink_state = v4l2_subdev_get_unlocked_active_state(sink_sd);
source_state = v4l2_subdev_get_unlocked_active_state(source_sd);
v4l2_subdev_get_unlocked_active_state(sd);
s_state = v4l2_subdev_get_unlocked_active_state(s_sd);
state = v4l2_subdev_get_unlocked_active_state(sd); \