Refactoring, housekeeping, documentation

Add a class diagram. Still needs some details.
Refactor to better respect SOLID principles.
Housekeeping, move and rename classes/files.

app/src/pwm/PWMControl.cxx

@@ -0,0 +1,82 @@
+#include <boost/json/object.hpp>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+
+#include <pwm/PWMControl.h>
+
+#define PWM_POSTFIX_ENABLE "_enable"
+#define PWM_POSTFIX_MODE "_mode"
+
+#define PWM_MAX_VALUE 255
+
+using namespace std;
+namespace fs = filesystem;
+
+PWMControl::PWMControl(string controlPath) : mControlPath(controlPath) {
+  fs::path pathEnable(mControlPath + PWM_POSTFIX_ENABLE);
+  fs::path pathMode(mControlPath + PWM_POSTFIX_MODE);
+
+  mEnablePath = pathEnable;
+  mModePath = pathMode;
+
+  ifstream istrm;
+
+  istrm.open(mEnablePath);
+  istrm >> mInitialEnable;
+  istrm.close();
+
+  istrm.open(mInitialMode);
+  istrm >> mInitialMode;
+  istrm.close();
+}
+
+PWMControl::~PWMControl() {
+  cout << "Cleanup" << endl;
+  Reset();
+}
+
+void PWMControl::pwm(int percent) {
+  int pwmValue = PWM_MAX_VALUE * percent / 100;
+
+  ofstream ostrm(mControlPath, ios::trunc);
+  ostrm << pwmValue;
+  ostrm.close();
+}
+
+int PWMControl::pwm() {
+  int value;
+  ifstream istrm;
+
+  istrm.open(mControlPath);
+  istrm >> value;
+
+  return value;
+}
+
+void PWMControl::EnableManualControl() {
+  ofstream ostrm(mEnablePath, ios::trunc);
+  ostrm << static_cast<int>(PWM_ENABLE::MANUAL_CONTROL);
+  ostrm.close();
+}
+
+void PWMControl::Reset() {
+  ofstream ostrm(mEnablePath, ios::trunc);
+
+  ostrm << mInitialEnable;
+  ostrm.close();
+
+  ostrm.open(mModePath, ios::trunc);
+  ostrm << mInitialMode;
+
+  ostrm.close();
+}
+
+const string PWMControl::toString() const {
+  return fs::path(mControlPath).filename();
+}
+
+json PWMControl::toJson() const {
+  json obj = {"PWMControl", mControlPath};
+  return obj;
+}