Add documentation, cleanup

app/include/fan/HwmonFan.h

@@ -1,17 +1,23 @@
 #ifndef HWMONFAN_H_
 #define HWMONFAN_H_
 
+#include <memory>
+
 #include <fan/Fan.h>
 #include <fan/PwmControl.h>
+#include <sensor/Sensor.h>
 
 class HwmonFan : public Fan {
 public:
+  HwmonFan(std::unique_ptr<PwmControl> pwmControl,
+           std::unique_ptr<Sensor> rpmSensor);
+
   void PWM(int percent) override;
   int RPM() override;
 
 private:
-  PwmControl mPwmControl;
-  // PwmSensor mPwmSensor;
+  std::unique_ptr<PwmControl> mPwmControl;
+  std::unique_ptr<Sensor> mRpmSensor;
 };
 
 #endif // HWMONFAN_H_