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/stepwisecontroller.hpp b/pid/stepwisecontroller.hpp
index a6b7816..f369397 100644
--- a/pid/stepwisecontroller.hpp
+++ b/pid/stepwisecontroller.hpp
@@ -14,7 +14,7 @@
 {
   public:
     static std::unique_ptr<Controller>
-        CreateStepwiseController(ZoneInterface* owner, const std::string& id,
+        createStepwiseController(ZoneInterface* owner, const std::string& id,
                                  const std::vector<std::string>& inputs,
                                  const ec::StepwiseInfo& initial);
 
@@ -26,13 +26,13 @@
     {
     }
 
-    float input_proc(void) override;
+    float inputProc(void) override;
 
-    void output_proc(float value) override;
+    void outputProc(float value) override;
 
     void process(void) override;
 
-    std::string get_id(void)
+    std::string getID(void)
     {
         return _id;
     }