power: supply: max8998_charger: Correct ONLINE and add STATUS props

The ONLINE prop should be when the charger is present (ie able to
charge), however, it was for when it was actually charging or not.
Instead, add the STATUS prop to show whether charging is actually
going on or not.

The magic numbers have been ported from a downstream kernel for the
SGH-T959V.

Signed-off-by: Jonathan Bakker <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/max8998_charger.c

···
 static enum power_supply_property max8998_battery_props[] = {
 	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
 	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
+	POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */
 };
 
 /* Note that the charger control is done by a current regulator "CHARGER" */
···
 		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
 		if (ret)
 			return ret;
-		if (reg & (1 << 3))
-			val->intval = 0;
-		else
+
+		if (reg & (1 << 5))
 			val->intval = 1;
+		else
+			val->intval = 0;
+
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
+		if (ret)
+			return ret;
+
+		if (!(reg & (1 << 5))) {
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		} else {
+			if (reg & (1 << 6))
+				val->intval = POWER_SUPPLY_STATUS_FULL;
+			else if (reg & (1 << 3))
+				val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			else
+				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		}
 		break;
 	default:
 		return -EINVAL;