TSL2591_FVAL_TO_MSEC
delay = TSL2591_FVAL_TO_MSEC(settings.als_int_time);
int_time_fval = TSL2591_FVAL_TO_MSEC(settings->als_int_time);
int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);
int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);