static void lp55xx_set_brightness(struct led_classdev *cdev,
			     enum led_brightness brightness)
{
	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);

	led->brightness = (u8)brightness;
	schedule_work(&led->brightness_work);
}
static void lp55xx_set_brightness(struct led_classdev *cdev,
			     enum led_brightness brightness)
			    //int brightness)
{
	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);

	led->brightness = brightness;
	printk("%s: brightness = %d\n", __func__, brightness);
	schedule_work(&led->brightness_work);
}
static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
{
	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
}