Add basic FanCurve implementation, docs

app/include/fan/FanCurve.h

@@ -0,0 +1,27 @@
+#ifndef FANCURVE_H_
+#define FANCURVE_H_
+
+#include <memory>
+#include <vector>
+
+#include <fan/HwmonFan.h>
+#include <sensor/Sensor.h>
+
+struct FanStep {
+  int Temp;
+  int Percent;
+};
+
+class FanCurve {
+public:
+  void DoFanControl();
+
+private:
+  int AggregateTemperature();
+
+  std::vector<FanStep> mSteps;
+  std::vector<std::shared_ptr<Sensor>> mTempSensors;
+  std::vector<std::shared_ptr<HwmonFan>> mFans;
+};
+
+#endif // FANCURVE_H_

app/src/fan/FanCurve.cxx

@@ -0,0 +1,45 @@
+#include <fan/FanCurve.h>
+
+#include <array>
+
+using namespace std;
+
+void FanCurve::DoFanControl() {
+  int temp = AggregateTemperature();
+
+  int t0, t1, p0, p1;
+
+  if (temp <= mSteps[0].Temp) {
+    t0 = t1 = mSteps[0].Temp;
+    p0 = p1 = mSteps[0].Percent;
+  } else if (temp > mSteps[mSteps.size() - 1].Temp) {
+    t0 = t1 = mSteps[mSteps.size() - 1].Temp;
+    p0 = p1 = mSteps[mSteps.size() - 1].Percent;
+  } else {
+    for (int i = 0; i < mSteps.size(); i++) {
+      if (temp > mSteps[i].Temp) {
+        t0 = mSteps[i].Temp;
+        p0 = mSteps[i].Percent;
+
+        t1 = mSteps[i + 1].Temp;
+        p1 = mSteps[i + 1].Percent;
+      }
+    }
+  }
+
+  int targetFanSpeed = p0 + ((p1 - p0) / (t1 - t0)) * (temp - t0);
+
+  for (auto f : mFans) {
+    f->pwm(targetFanSpeed);
+  }
+}
+
+// Dummy Implementation using AVG
+int FanCurve::AggregateTemperature() {
+  int sum;
+  for (auto s : mTempSensors) {
+    sum += s->value();
+  }
+
+  return sum / mTempSensors.size();
+}

doc/Class.plantuml

@@ -56,36 +56,33 @@ class FanGenerator
         + FanList FindFans(List<RPMSensor>, List<PWMControl>)
 }
 
-struct Coordinate
+struct FanStep
 {
-        int X
+        int Temp
-        int Y
+        int Percent
-}
-
-enum SensorAggregateFunction
-{
-        MIN
-        MAX
-        AVG
 }
 
 class FanCurve
 {
-        - List<Coordinate> Steps
+        - List<FanStep> Steps
         - List<Sensor> TempSensor
-        - SensorAggregateFunction Fun
+        - List<HWMONFan> Fan
-        - HWMONFan Fan
 
-        + int TargetPWMPercent()
+        + DoFanControl()
 }
 
 class FanController
 {
-        - List<HWMONFan>
+        - List<FanCurve>
 
         + void StartFanControlLoop()
 }
 
+class ConfigManager
+{
+
+}
+
 HWMONFan -- Sensor
 HWMONFan -- PWMControl
 HWMONFan - FanCurve
@@ -107,7 +104,7 @@ FanGenerator - SensorManager
 FanGenerator - PWMControl
 
 Sensor - FanCurve
-FanCurve -- Coordinate
+FanCurve -- FanStep
 FanCurve -- SensorAggregateFunction
 
 FanController -- FanCurve