power: add to_power_supply macro to the API

This patch adds the to_power_supply macro to upcast
a device to a power_supply struct.

This is needed because the same piece of code using
container_of is used in various other places, so we
abstract away such low-level operations via a macro.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ognjen Galic <smclt30p@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

4 files changed, 3 insertions, 11 deletions

diff --git a/drivers/power/supply/ds2780_battery.c b/drivers/power/supply/ds2780_battery.c
index e5d81b493c45..370e9109342b 100644
--- a/drivers/power/supply/ds2780_battery.c
+++ b/drivers/power/supply/ds2780_battery.c
@@ -56,11 +56,6 @@ to_ds2780_device_info(struct power_supply *psy)
         return power_supply_get_drvdata(psy);
 }
 
-static inline struct power_supply *to_power_supply(struct device *dev)
-{
-        return dev_get_drvdata(dev);
-}
-
 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
         char *buf, int addr, size_t count, int io)
 {
diff --git a/drivers/power/supply/ds2781_battery.c b/drivers/power/supply/ds2781_battery.c
index efe83ef8670c..d1b5a19aae7c 100644
--- a/drivers/power/supply/ds2781_battery.c
+++ b/drivers/power/supply/ds2781_battery.c
@@ -54,11 +54,6 @@ to_ds2781_device_info(struct power_supply *psy)
         return power_supply_get_drvdata(psy);
 }
 
-static inline struct power_supply *to_power_supply(struct device *dev)
-{
-        return dev_get_drvdata(dev);
-}
-
 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
         char *buf, int addr, size_t count, int io)
 {
diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 82f998ab5a52..feac7b066e6c 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -668,7 +668,7 @@ EXPORT_SYMBOL_GPL(power_supply_powers);
 
 static void power_supply_dev_release(struct device *dev)
 {
-        struct power_supply *psy = container_of(dev, struct power_supply, dev);
+        struct power_supply *psy = to_power_supply(dev);
         dev_dbg(dev, "%s\n", __func__);
         kfree(psy);
 }
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 79e90b3d3288..f0139b460a72 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -371,6 +371,8 @@ devm_power_supply_register_no_ws(struct device *parent,
 extern void power_supply_unregister(struct power_supply *psy);
 extern int power_supply_powers(struct power_supply *psy, struct device *dev);
 
+#define to_power_supply(device) container_of(device, struct power_supply, dev)
+
 extern void *power_supply_get_drvdata(struct power_supply *psy);
 /* For APM emulation, think legacy userspace. */
 extern struct class *power_supply_class;