power: supply: bq2415x_charger: report online status

Provide the Online property. This chip does not have specific flags to
indicate the presence of an input voltage, but this is implied by all valid
charging states. Fault states also only occur when VBUS is present, so set
Online true for those as well.
Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Link: https://lore.kernel.org/r/20240229063721.2592069-2-absicsz@gmail.comSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/bq2415x_charger.c

@@ -991,6 +991,7 @@ static enum power_supply_property bq2415x_power_supply_props[] = {
 	/* TODO: maybe add more power supply properties */
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_ONLINE,
 };
 
 static int bq2415x_power_supply_get_property(struct power_supply *psy,
@@ -1017,6 +1018,15 @@ static int bq2415x_power_supply_get_property(struct power_supply *psy,
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = bq->model;
 		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		/* VBUS is present for all charging and fault states,
+		 * except the 'Ready' state.
+		 */
+		ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
+		if (ret < 0)
+			return ret;
+		val->intval = ret > 0;
+		break;
 	default:
 		return -EINVAL;
 	}