@startuml
interface Fan {
        {abstract} void PWM(int percent)
        {abstract} int RPM()
}

interface Sensor {
        {abstract} int value()
        {abstract} string name()
}

class HwmonFan {

}

Fan <|-- HwmonFan

Sensor <|-- HwmonSensor
Sensor <|-- NvidiaSensor

HwmonFan - Sensor
HwmonFan -- PwmControl


@enduml