samsabi_kbd_set
samsabi_kbd_set(sc, 0);
samsabi_kbd_set(sc, sc->sc_backlight);
error = samsabi_kbd_set(sc, SAMSABI_KBD_MAX_BACKLIGHT);
(void)samsabi_kbd_set(sc, sc->sc_backlight);
error = samsabi_kbd_set(sc, level);
int samsabi_kbd_set(struct samsabi_softc *, uint8_t);