GC Adapter Implementation

src/input_common/gcadapter/gc_adapter.h

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+#pragma once
+#include <algorithm>
+#include <libusb.h>
+#include <mutex>
+#include <functional>
+#include "common/common_types.h"
+
+
+enum {
+    PAD_USE_ORIGIN = 0x0080,
+    PAD_GET_ORIGIN = 0x2000,
+    PAD_ERR_STATUS = 0x8000,
+};
+
+enum PadButton {
+    PAD_BUTTON_LEFT = 0x0001,
+    PAD_BUTTON_RIGHT = 0x0002,
+    PAD_BUTTON_DOWN = 0x0004,
+    PAD_BUTTON_UP = 0x0008,
+    PAD_TRIGGER_Z = 0x0010,
+    PAD_TRIGGER_R = 0x0020,
+    PAD_TRIGGER_L = 0x0040,
+    PAD_BUTTON_A = 0x0100,
+    PAD_BUTTON_B = 0x0200,
+    PAD_BUTTON_X = 0x0400,
+    PAD_BUTTON_Y = 0x0800,
+    PAD_BUTTON_START = 0x1000,
+    // Below is for compatibility with "AxisButton" type
+    PAD_STICK = 0x2000,
+
+};
+
+enum PadAxes { STICK_X, STICK_Y, SUBSTICK_X, SUBSTICK_Y, TRIGGER_LEFT, TRIGGER_RIGHT };
+
+struct GCPadStatus {
+    u16 button;      // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+    u8 stickX;       // 0 <= stickX       <= 255
+    u8 stickY;       // 0 <= stickY       <= 255
+    u8 substickX;    // 0 <= substickX    <= 255
+    u8 substickY;    // 0 <= substickY    <= 255
+    u8 triggerLeft;  // 0 <= triggerLeft  <= 255
+    u8 triggerRight; // 0 <= triggerRight <= 255
+    bool isConnected{true};
+
+    static const u8 MAIN_STICK_CENTER_X = 0x80;
+    static const u8 MAIN_STICK_CENTER_Y = 0x80;
+    static const u8 MAIN_STICK_RADIUS = 0x7f;
+    static const u8 C_STICK_CENTER_X = 0x80;
+    static const u8 C_STICK_CENTER_Y = 0x80;
+    static const u8 C_STICK_RADIUS = 0x7f;
+
+    static const u8 TRIGGER_CENTER = 20;
+    static const u8 THRESHOLD = 10;
+    u8 port;
+    u8 axis_which = 255;
+    u8 axis_value = 255;
+};
+
+struct GCState {
+    std::unordered_map<int, bool> buttons;
+    std::unordered_map<int, u16> axes;
+};
+
+
+namespace GCAdapter {
+enum ControllerTypes {
+    CONTROLLER_NONE = 0,
+    CONTROLLER_WIRED = 1,
+    CONTROLLER_WIRELESS = 2
+};
+
+enum {
+    NO_ADAPTER_DETECTED = 0,
+    ADAPTER_DETECTED = 1,
+};
+
+// Current adapter status: detected/not detected/in error (holds the error code)
+static int current_status = NO_ADAPTER_DETECTED;
+
+GCPadStatus CheckStatus(int port, u8 adapter_payload[37]);
+/// Initialize the GC Adapter capture and read sequence
+void Init();
+
+/// Close the adapter read thread and release the adapter
+void Shutdown();
+
+/// Begin scanning for the GC Adapter.
+void StartScanThread();
+
+/// Stop scanning for the adapter
+void StopScanThread();
+
+/// Returns true if there is a device connected to port
+bool DeviceConnected(int port);
+
+/// Resets status of device connected to port
+void ResetDeviceType(int port);
+
+/// Returns true if we successfully gain access to GC Adapter
+bool CheckDeviceAccess(libusb_device* device);
+
+/// Captures GC Adapter endpoint address,
+void GetGCEndpoint(libusb_device* device);
+
+/// For shutting down, clear all data, join all threads, release usb
+void Reset();
+
+/// For use in initialization, querying devices to find the adapter
+void Setup();
+
+/// Used for polling
+void BeginConfiguration();
+
+void EndConfiguration();
+
+} // end of namespace GCAdapter