PAD: Basic support for digital controllers

src/pse/pad_device.cpp

@@ -0,0 +1,11 @@
+#include "pad_device.h"
+
+PadDevice::PadDevice() = default;
+
+PadDevice::~PadDevice() = default;
+
+bool PadDevice::Transfer(const u8 data_in, u8* data_out)
+{
+  *data_out = 0xFF;
+  return false;
+}