566     static int __dequeue_buffer(struct preview_stream_ops* w,  in __dequeue_buffer()
586     static int __lock_buffer(struct preview_stream_ops* w,  in __lock_buffer()
593     static int __enqueue_buffer(struct preview_stream_ops* w,  in __enqueue_buffer()
601     static int __cancel_buffer(struct preview_stream_ops* w,  in __cancel_buffer()
609     static int __set_buffer_count(struct preview_stream_ops* w, int count)  in __set_buffer_count()
615     static int __set_buffers_geometry(struct preview_stream_ops* w,  in __set_buffers_geometry()
623     static int __set_crop(struct preview_stream_ops *w,  in __set_crop()
635     static int __set_timestamp(struct preview_stream_ops *w,  in __set_timestamp()
641     static int __set_usage(struct preview_stream_ops* w, int usage)  in __set_usage()
647     static int __set_swap_interval(struct preview_stream_ops *w, int interval)  in __set_swap_interval()
654                       const struct preview_stream_ops *w,  in __get_min_undequeued_buffer_count()