BRIGHTNESS_MAX
netwalker_set_brightness(sc, BRIGHTNESS_MAX);
KASSERT(level >= 0 && level <= BRIGHTNESS_MAX);
if (sc->sc_brightness > BRIGHTNESS_MAX) sc->sc_brightness = BRIGHTNESS_MAX;
conf.duty_cycle = (conf.period * val) / BRIGHTNESS_MAX;
else if (newval > BRIGHTNESS_MAX)
newval = BRIGHTNESS_MAX;
dp->max = BRIGHTNESS_MAX;
level = uimin(BRIGHTNESS_MAX, level + step);
static int brightness = BRIGHTNESS_MAX;