Bluetooth: HFP_AG: Set battery level

Add a function `bt_hfp_ag_battery_level` to set the battery level.

Signed-off-by: Lyle Zhu <[email protected]>

Author: lylezhu2012

include/zephyr/bluetooth/classic/hfp_ag.h

@@ -725,6 +725,17 @@ int bt_hfp_ag_signal_strength(struct bt_hfp_ag *ag, uint8_t strength);
  */
 int bt_hfp_ag_roaming_status(struct bt_hfp_ag *ag, uint8_t status);
 
+/** @brief Set battery level
+ *
+ *  Set battery level.
+ *
+ *  @param ag HFP AG object.
+ *  @param level battery level.
+ *
+ *  @return 0 in case of success or negative value in case of error.
+ */
+int bt_hfp_ag_battery_level(struct bt_hfp_ag *ag, uint8_t level);
+
 #ifdef __cplusplus
 }
 #endif

subsys/bluetooth/host/classic/hfp_ag.c

@@ -4672,3 +4672,29 @@ int bt_hfp_ag_roaming_status(struct bt_hfp_ag *ag, uint8_t status)
 
 	return err;
 }
+
+int bt_hfp_ag_battery_level(struct bt_hfp_ag *ag, uint8_t level)
+{
+	int err;
+
+	LOG_DBG("");
+
+	if (ag == NULL) {
+		return -EINVAL;
+	}
+
+	hfp_ag_lock(ag);
+	if (ag->state != BT_HFP_CONNECTED) {
+		hfp_ag_unlock(ag);
+		return -ENOTCONN;
+	}
+	hfp_ag_unlock(ag);
+
+	err = hfp_ag_update_indicator(ag, BT_HFP_AG_BATTERY_IND, level,
+						NULL, NULL);
+	if (err) {
+		LOG_ERR("Fail to set battery level err :(%d)", err);
+	}
+
+	return err;
+}