Add basic FanCurve implementation, docs

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();
+}