Add mapping logic, refactor stuff

app/src/fan/HwmonFan.cxx

@@ -0,0 +1,11 @@
+#include <fan/HwmonFan.h>
+
+using namespace std;
+
+HwmonFan::HwmonFan(shared_ptr<PwmControl> pwmControl,
+                   shared_ptr<Sensor> rpmSensor)
+    : mPwmControl(pwmControl), mRpmSensor(rpmSensor) {}
+
+void HwmonFan::pwm(int percent) { mPwmControl->pwm(percent); }
+
+int HwmonFan::rpm() { return mRpmSensor->value(); }

app/src/fan/PwmControl.cxx

@@ -64,3 +64,7 @@ void PwmControl::reset() {
 
   ostrm.close();
 }
+
+const string PwmControl::toString() const {
+  return fs::path(mControlPath).filename();
+}