Bluetooth: BAP: Add bt_bap_unicast_client_unregister_cb

doc/releases/release-notes-4.3.rst

@@ -118,6 +118,7 @@ New APIs and options
     * :c:struct:`bt_bap_stream` now contains an ``iso`` field as a reference to the ISO channel
     * :c:func:`bt_bap_unicast_group_get_info`
     * :c:func:`bt_cap_unicast_group_get_info`
+    * :c:func:`bt_bap_unicast_client_unregister_cb`
 
   * Host
 

include/zephyr/bluetooth/audio/bap.h

@@ -1967,17 +1967,24 @@ struct bt_bap_unicast_client_cb {
 /**
  * @brief Register unicast client callbacks.
  *
- * Only one callback structure can be registered, and attempting to
- * registering more than one will result in an error.
- *
- * @param cb  Unicast client callback structure.
+ * @param cb  Unicast client callback structure to register.
  *
  * @retval 0 Success
  * @retval -EINVAL @p cb is NULL.
  * @retval -EEXIST @p cb is already registered.
  */
 int bt_bap_unicast_client_register_cb(struct bt_bap_unicast_client_cb *cb);
 
+/**
+ * @brief Unregister unicast client callbacks.
+ *
+ * @param cb  Unicast client callback structure to unregister.
+ *
+ * @retval 0 Success
+ * @retval -EINVAL @p cb is NULL or @p cb was not registered
+ */
+int bt_bap_unicast_client_unregister_cb(struct bt_bap_unicast_client_cb *cb);
+
 /**
  * @brief Discover remote capabilities and endpoints
  *

subsys/bluetooth/audio/bap_unicast_client.c

@@ -4684,3 +4684,18 @@ int bt_bap_unicast_client_register_cb(struct bt_bap_unicast_client_cb *cb)
 
 	return 0;
 }
+
+int bt_bap_unicast_client_unregister_cb(struct bt_bap_unicast_client_cb *cb)
+{
+	if (cb == NULL) {
+		LOG_DBG("cb was NULL");
+		return -EINVAL;
+	}
+
+	if (!sys_slist_find_and_remove(&unicast_client_cbs, &cb->_node)) {
+		LOG_DBG("cb was not registered");
+		return -EALREADY;
+	}
+
+	return 0;
+}