style: member functions should be lower camel

Rename member functions to be lower camel instead of snake case.

Change-Id: Ib227fd3dadb6d9607290277205223a4324cd4ce5
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/pid/fancontroller.hpp b/pid/fancontroller.hpp
index e0e79e7..821c900 100644
--- a/pid/fancontroller.hpp
+++ b/pid/fancontroller.hpp
@@ -17,7 +17,7 @@
 {
   public:
     static std::unique_ptr<PIDController>
-        CreateFanPid(ZoneInterface* owner, const std::string& id,
+        createFanPid(ZoneInterface* owner, const std::string& id,
                      const std::vector<std::string>& inputs,
                      const ec::pidinfo& initial);
 
@@ -28,9 +28,9 @@
     {
     }
 
-    float input_proc(void) override;
-    float setpt_proc(void) override;
-    void output_proc(float value) override;
+    float inputProc(void) override;
+    float setptProc(void) override;
+    void outputProc(float value) override;
 
     FanSpeedDirection getFanDirection(void) const
     {