implement a2dp remain todo/interfaces

doc/connectivity/bluetooth/shell/classic/a2dp.rst

@@ -14,6 +14,8 @@ Here is a example connecting two devices:
  * Source or Sink establish the stream. using :code:`a2dp establish`.
  * Source or Sink start the media. using :code:`a2dp start`.
  * Source test the media sending. using :code:`a2dp send_media` to send one test packet data.
+ * Source or Sink suspend the media. using :code:`a2dp suspend`.
+ * Source or Sink release the media. using :code:`a2dp release`.
 
 .. tabs::
 
@@ -58,6 +60,12 @@ Here is a example connecting two devices:
                         uart:~$ a2dp send_media
                         frames num: 1, data length: 160
                         data: 1, 2, 3, 4, 5, 6 ......
+                        uart:~$ a2dp suspend
+                        success to suspend
+                        stream suspended
+                        uart:~$ a2dp release
+                        success to release
+                        stream released
 
         .. group-tab:: Device B (Audio Sink Side)
 
@@ -74,7 +82,6 @@ Here is a example connecting two devices:
                         a2dp connected
                         <after a2dp configure of source side>
                         receive requesting config and accept
-                        SBC configure success
                         sample rate 44100Hz
                         stream configured
                         <after a2dp establish of source side>
@@ -86,4 +93,10 @@ Here is a example connecting two devices:
                         <after a2dp send_media of source side>
                         received, num of frames: 1, data length: 160
                         data: 1, 2, 3, 4, 5, 6 ......
+                        <after a2dp suspend of source side>
+                        receive requesting suspend and accept
+                        stream suspended
+                        <after a2dp release of source side>
+                        receive requesting release and accept
+                        stream released
                         ...

include/zephyr/bluetooth/classic/avdtp.h

@@ -87,11 +87,11 @@ enum bt_avdtp_media_type {
  */
 struct bt_avdtp_sep_info {
 	/** End Point usage status */
-	uint8_t inuse:1;
+	uint8_t inuse: 1;
 	/** Stream End Point ID that is the identifier of the stream endpoint */
-	uint8_t id:6;
+	uint8_t id: 6;
 	/** Reserved */
-	uint8_t reserved:1;
+	uint8_t reserved: 1;
 	/** Stream End-point Type that indicates if the stream end-point is SNK or SRC */
 	enum bt_avdtp_sep_type tsep;
 	/** Media-type of the End Point
@@ -127,8 +127,9 @@ struct bt_avdtp_sep {
 	/** Media Transport Channel*/
 	struct bt_l2cap_br_chan chan;
 	/** the endpoint media data */
-	void (*media_data_cb)(struct bt_avdtp_sep *sep,
-				struct net_buf *buf);
+	void (*media_data_cb)(struct bt_avdtp_sep *sep, struct net_buf *buf);
+	/* semaphore for lock/unlock */
+	struct k_sem sem_lock;
 	/** avdtp session */
 	struct bt_avdtp *session;
 	/** SEP state */