Input: wacom - export battery scope

This will stop UPower from detecting the tablet as a power supply,
and using its battery status to hibernate or switch off the machine.

https://bugs.freedesktop.org/show_bug.cgi?id=70321

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/tablet/wacom_sys.c

@@ -1031,6 +1031,7 @@ static void wacom_destroy_leds(struct wacom *wacom)
 }
 
 static enum power_supply_property wacom_battery_props[] = {
+	POWER_SUPPLY_PROP_SCOPE,
 	POWER_SUPPLY_PROP_CAPACITY
 };
 
@@ -1042,6 +1043,9 @@ static int wacom_battery_get_property(struct power_supply *psy,
 	int ret = 0;
 
 	switch (psp) {
+		case POWER_SUPPLY_PROP_SCOPE:
+			val->intval = POWER_SUPPLY_SCOPE_DEVICE;
+			break;
 		case POWER_SUPPLY_PROP_CAPACITY:
 			val->intval =
 				wacom->wacom_wac.battery_capacity * 100 / 31;