Split MemoryCard and PadDevice (now Controller)

src/core/controller.h

@@ -0,0 +1,28 @@
+#pragma once
+#include "types.h"
+#include <optional>
+#include <string_view>
+
+class StateWrapper;
+
+class Controller
+{
+public:
+  Controller();
+  virtual ~Controller();
+
+  virtual void Reset();
+  virtual bool DoState(StateWrapper& sw);
+
+  // Resets all state for the transferring to/from the device.
+  virtual void ResetTransferState();
+
+  // Returns the value of ACK, as well as filling out_data.
+  virtual bool Transfer(const u8 data_in, u8* data_out);
+
+  /// Creates a new controller of the specified type.
+  static std::shared_ptr<Controller> Create(std::string_view type_name);
+
+  /// Gets the integer code for a button in the specified controller type.
+  static std::optional<s32> GetButtonCodeByName(std::string_view type_name, std::string_view button_name);
+};