delayed_led_classdev
static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
static struct delayed_led_classdev hpled_led = {
void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
struct delayed_led_classdev *data =
container_of(work, struct delayed_led_classdev, work);
struct delayed_led_classdev *data = container_of(led_cdev,
struct delayed_led_classdev, led_classdev);