tsl2591_set_als_lower_threshold
ret = tsl2591_set_als_lower_threshold(chip, TSL2591_DEFAULT_ALS_LOWER_THRESH);
static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip,
tsl2591_set_als_lower_threshold(chip, als_lower_threshold);
ret = tsl2591_set_als_lower_threshold(chip, val);