power: supply: max17042_battery: mAh readings depend on r_sns value

The PROP_CHARGE_FULL code was hardcoded for the default sense
resistor of 0.010 Ohm, make it use r_sns which contains the
actual sense resistor value in micro-Ohms instead.
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

@@ -220,6 +220,7 @@ static int max17042_get_property(struct power_supply *psy,
 	struct regmap *map = chip->regmap;
 	int ret;
 	u32 data;
+	u64 data64;
 
 	if (!chip->init_complete)
 		return -EAGAIN;
@@ -309,7 +310,9 @@ static int max17042_get_property(struct power_supply *psy,
 		if (ret < 0)
 			return ret;
 
-		val->intval = data * 1000 / 2;
+		data64 = data * 5000000ll;
+		do_div(data64, chip->pdata->r_sns);
+		val->intval = data64;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 		ret = regmap_read(map, MAX17042_QH, &data);