power: supply: max17042_battery: Add support for the CHARGE_FULL_DESIGN property

The info is there, lets export it as a property.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

drivers/power/supply/max17042_battery.c

@@ -87,6 +87,7 @@ static enum power_supply_property max17042_battery_props[] = {
 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
 	POWER_SUPPLY_PROP_VOLTAGE_OCV,
 	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 	POWER_SUPPLY_PROP_CHARGE_FULL,
 	POWER_SUPPLY_PROP_CHARGE_COUNTER,
 	POWER_SUPPLY_PROP_TEMP,
@@ -305,6 +306,15 @@ static int max17042_get_property(struct power_supply *psy,
 
 		val->intval = data >> 8;
 		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+		ret = regmap_read(map, MAX17042_DesignCap, &data);
+		if (ret < 0)
+			return ret;
+
+		data64 = data * 5000000ll;
+		do_div(data64, chip->pdata->r_sns);
+		val->intval = data64;
+		break;
 	case POWER_SUPPLY_PROP_CHARGE_FULL:
 		ret = regmap_read(map, MAX17042_FullCAP, &data);
 		if (ret < 0)