Introduce a helper to check if a power supply implements a certain
property. It will be used by the sysfs and hwmon code to remove similar
open-coded checks.
It also paves the way for the extension API to hook into.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/power/supply/power_supply.h      |  2 ++
 drivers/power/supply/power_supply_core.c | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/power/supply/power_supply.h b/drivers/power/supply/power_supply.h
index 7434a6f2477504ee6c0a3c7420e1444387b41180..5dabbd895538003096b62d03fdd0201b82b090e6 100644
--- a/drivers/power/supply/power_supply.h
+++ b/drivers/power/supply/power_supply.h
@@ -15,6 +15,8 @@ struct power_supply;
 
 extern int power_supply_property_is_writeable(struct power_supply *psy,
 					      enum power_supply_property psp);
+extern bool power_supply_has_property(struct power_supply *psy,
+				      enum power_supply_property psp);
 
 #ifdef CONFIG_SYSFS
 
diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index 2f61f6b90b99f40ee04a6d63ebc20036f0447102..502b07468b93dfb7f5a6c2092588d931a7d015f2 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -1196,6 +1196,18 @@ static bool psy_desc_has_property(const struct power_supply_desc *psy_desc,
 	return found;
 }
 
+bool power_supply_has_property(struct power_supply *psy,
+			       enum power_supply_property psp)
+{
+	if (psy_desc_has_property(psy->desc, psp))
+		return true;
+
+	if (power_supply_battery_info_has_prop(psy->battery_info, psp))
+		return true;
+
+	return false;
+}
+
 int power_supply_get_property(struct power_supply *psy,
 			    enum power_supply_property psp,
 			    union power_supply_propval *val)

-- 
2.47.0