tsl2591_set_als_upper_threshold
ret = tsl2591_set_als_upper_threshold(chip, TSL2591_DEFAULT_ALS_UPPER_THRESH);
static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip,
tsl2591_set_als_upper_threshold(chip, als_upper_threshold);
ret = tsl2591_set_als_upper_threshold(chip, val);