leds: trigger: netdev: add basic check for hw control support

Add basic check for hw control support. Check if the required API are
defined and check if the defined trigger supported in hw control for the
LED driver match netdev.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/leds/trigger/ledtrig-netdev.c

@@ -92,8 +92,22 @@ static void set_baseline_state(struct led_netdev_data *trigger_data)
 	}
 }
 
+static bool supports_hw_control(struct led_classdev *led_cdev)
+{
+	if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
+	    !led_cdev->hw_control_is_supported)
+		return false;
+
+	return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
+}
+
 static bool can_hw_control(struct led_netdev_data *trigger_data)
 {
+	struct led_classdev *led_cdev = trigger_data->led_cdev;
+
+	if (!supports_hw_control(led_cdev))
+		return false;
+
 	return false;
 }