device/pipe: add a control cmd to get the space left in pipe

2026-09-21 18:57:16 +08:00 · 2013-10-23 01:43:18 +08:00
parent ac5da68db7
commit 0feefc03b6
2 changed files with 4 additions and 0 deletions
@@ -114,6 +114,8 @@ struct rt_pipe_device
    struct rt_portal_device *read_portal;
 };

+#define PIPE_CTRL_GET_SPACE          0x14            /**< get the remaining size of a pipe device */
+
 #define RT_DATAQUEUE_EVENT_UNKNOWN   0x00
 #define RT_DATAQUEUE_EVENT_POP       0x01
 #define RT_DATAQUEUE_EVENT_PUSH      0x02