diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index bcdbb5d8e194..737bc4d86088 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -680,7 +680,7 @@ config CHARGER_RK817
 	  This driver can give support for Rk817 Charger Interface.
 
 config BATTERY_RK818
-	bool "RK818 Battery driver"
+	tristate "RK818 Battery driver"
 	depends on MFD_RK808
 	default n
 	help
@@ -688,7 +688,7 @@ config BATTERY_RK818
 	  This driver can give support for Rk818 Battery Charge Interface.
 
 config CHARGER_RK818
-	bool "RK818 Charger driver"
+	tristate "RK818 Charger driver"
 	depends on MFD_RK808
 	default n
 	help
diff --git a/drivers/power/supply/rk818_battery.c b/drivers/power/supply/rk818_battery.c
index d5026e7b81fe..0c76b57fdc08 100644
--- a/drivers/power/supply/rk818_battery.c
+++ b/drivers/power/supply/rk818_battery.c
@@ -2758,11 +2758,13 @@ int rk818_bat_temp_notifier_register(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_register(&rk818_bat_notifier_chain, nb);
 }
+EXPORT_SYMBOL_GPL(rk818_bat_temp_notifier_register);
 
 int rk818_bat_temp_notifier_unregister(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_unregister(&rk818_bat_notifier_chain, nb);
 }
+EXPORT_SYMBOL_GPL(rk818_bat_temp_notifier_unregister);
 
 static void rk818_bat_temp_notifier_callback(int temp)
 {