1 files changed, 483 insertions, 0 deletions
diff --git a/src/input_common/drivers/gc_adapter.cpp b/src/input_common/drivers/gc_adapter.cpp
new file mode 100644
index 000000000..6721ba4f7
--- /dev/null
+++ b/src/input_common/drivers/gc_adapter.cpp
@@ -0,0 +1,483 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <fmt/format.h>
+#include <libusb.h>
+
+#include "common/logging/log.h"
+#include "common/param_package.h"
+#include "common/settings_input.h"
+#include "common/thread.h"
+#include "input_common/drivers/gc_adapter.h"
+
+namespace InputCommon {
+
+class LibUSBContext {
+public:
+    explicit LibUSBContext() {
+        init_result = libusb_init(&ctx);
+    }
+
+    ~LibUSBContext() {
+        libusb_exit(ctx);
+    }
+
+    LibUSBContext& operator=(const LibUSBContext&) = delete;
+    LibUSBContext(const LibUSBContext&) = delete;
+
+    LibUSBContext& operator=(LibUSBContext&&) noexcept = delete;
+    LibUSBContext(LibUSBContext&&) noexcept = delete;
+
+    [[nodiscard]] int InitResult() const noexcept {
+        return init_result;
+    }
+
+    [[nodiscard]] libusb_context* get() noexcept {
+        return ctx;
+    }
+
+private:
+    libusb_context* ctx;
+    int init_result{};
+};
+
+class LibUSBDeviceHandle {
+public:
+    explicit LibUSBDeviceHandle(libusb_context* ctx, uint16_t vid, uint16_t pid) noexcept {
+        handle = libusb_open_device_with_vid_pid(ctx, vid, pid);
+    }
+
+    ~LibUSBDeviceHandle() noexcept {
+        if (handle) {
+            libusb_release_interface(handle, 1);
+            libusb_close(handle);
+        }
+    }
+
+    LibUSBDeviceHandle& operator=(const LibUSBDeviceHandle&) = delete;
+    LibUSBDeviceHandle(const LibUSBDeviceHandle&) = delete;
+
+    LibUSBDeviceHandle& operator=(LibUSBDeviceHandle&&) noexcept = delete;
+    LibUSBDeviceHandle(LibUSBDeviceHandle&&) noexcept = delete;
+
+    [[nodiscard]] libusb_device_handle* get() noexcept {
+        return handle;
+    }
+
+private:
+    libusb_device_handle* handle{};
+};
+
+GCAdapter::GCAdapter(const std::string input_engine_) : InputEngine(input_engine_) {
+    if (usb_adapter_handle) {
+        return;
+    }
+    LOG_INFO(Input, "GC Adapter Initialization started");
+
+    libusb_ctx = std::make_unique<LibUSBContext>();
+    const int init_res = libusb_ctx->InitResult();
+    if (init_res == LIBUSB_SUCCESS) {
+        adapter_scan_thread =
+            std::jthread([this](std::stop_token stop_token) { AdapterScanThread(stop_token); });
+    } else {
+        LOG_ERROR(Input, "libusb could not be initialized. failed with error = {}", init_res);
+    }
+}
+
+GCAdapter::~GCAdapter() {
+    Reset();
+}
+
+void GCAdapter::AdapterInputThread(std::stop_token stop_token) {
+    LOG_DEBUG(Input, "GC Adapter input thread started");
+    Common::SetCurrentThreadName("yuzu:input:GCAdapter");
+    s32 payload_size{};
+    AdapterPayload adapter_payload{};
+
+    adapter_scan_thread = {};
+
+    while (!stop_token.stop_requested()) {
+        libusb_interrupt_transfer(usb_adapter_handle->get(), input_endpoint, adapter_payload.data(),
+                                  static_cast<s32>(adapter_payload.size()), &payload_size, 16);
+        if (IsPayloadCorrect(adapter_payload, payload_size)) {
+            UpdateControllers(adapter_payload);
+            UpdateVibrations();
+        }
+        std::this_thread::yield();
+    }
+
+    if (restart_scan_thread) {
+        adapter_scan_thread =
+            std::jthread([this](std::stop_token token) { AdapterScanThread(token); });
+        restart_scan_thread = false;
+    }
+}
+
+bool GCAdapter::IsPayloadCorrect(const AdapterPayload& adapter_payload, s32 payload_size) {
+    if (payload_size != static_cast<s32>(adapter_payload.size()) ||
+        adapter_payload[0] != LIBUSB_DT_HID) {
+        LOG_DEBUG(Input, "Error reading payload (size: {}, type: {:02x})", payload_size,
+                  adapter_payload[0]);
+        if (input_error_counter++ > 20) {
+            LOG_ERROR(Input, "GC adapter timeout, Is the adapter connected?");
+            adapter_input_thread.request_stop();
+            restart_scan_thread = true;
+        }
+        return false;
+    }
+
+    input_error_counter = 0;
+    return true;
+}
+
+void GCAdapter::UpdateControllers(const AdapterPayload& adapter_payload) {
+    for (std::size_t port = 0; port < pads.size(); ++port) {
+        const std::size_t offset = 1 + (9 * port);
+        const auto type = static_cast<ControllerTypes>(adapter_payload[offset] >> 4);
+        UpdatePadType(port, type);
+        if (DeviceConnected(port)) {
+            const u8 b1 = adapter_payload[offset + 1];
+            const u8 b2 = adapter_payload[offset + 2];
+            UpdateStateButtons(port, b1, b2);
+            UpdateStateAxes(port, adapter_payload);
+        }
+    }
+}
+
+void GCAdapter::UpdatePadType(std::size_t port, ControllerTypes pad_type) {
+    if (pads[port].type == pad_type) {
+        return;
+    }
+    // Device changed reset device and set new type
+    pads[port] = {};
+    pads[port].type = pad_type;
+}
+
+void GCAdapter::UpdateStateButtons(std::size_t port, [[maybe_unused]] u8 b1,
+                                   [[maybe_unused]] u8 b2) {
+    if (port >= pads.size()) {
+        return;
+    }
+
+    static constexpr std::array<PadButton, 8> b1_buttons{
+        PadButton::ButtonA,    PadButton::ButtonB,     PadButton::ButtonX,    PadButton::ButtonY,
+        PadButton::ButtonLeft, PadButton::ButtonRight, PadButton::ButtonDown, PadButton::ButtonUp,
+    };
+
+    static constexpr std::array<PadButton, 4> b2_buttons{
+        PadButton::ButtonStart,
+        PadButton::TriggerZ,
+        PadButton::TriggerR,
+        PadButton::TriggerL,
+    };
+
+    for (std::size_t i = 0; i < b1_buttons.size(); ++i) {
+        const bool button_status = (b1 & (1U << i)) != 0;
+        const int button = static_cast<int>(b1_buttons[i]);
+        SetButton(pads[port].identifier, button, button_status);
+    }
+
+    for (std::size_t j = 0; j < b2_buttons.size(); ++j) {
+        const bool button_status = (b2 & (1U << j)) != 0;
+        const int button = static_cast<int>(b2_buttons[j]);
+        SetButton(pads[port].identifier, button, button_status);
+    }
+}
+
+void GCAdapter::UpdateStateAxes(std::size_t port, const AdapterPayload& adapter_payload) {
+    if (port >= pads.size()) {
+        return;
+    }
+
+    const std::size_t offset = 1 + (9 * port);
+    static constexpr std::array<PadAxes, 6> axes{
+        PadAxes::StickX,    PadAxes::StickY,      PadAxes::SubstickX,
+        PadAxes::SubstickY, PadAxes::TriggerLeft, PadAxes::TriggerRight,
+    };
+
+    for (const PadAxes axis : axes) {
+        const auto index = static_cast<std::size_t>(axis);
+        const u8 axis_value = adapter_payload[offset + 3 + index];
+        if (pads[port].reset_origin_counter <= 18) {
+            if (pads[port].axis_origin[index] != axis_value) {
+                pads[port].reset_origin_counter = 0;
+            }
+            pads[port].axis_origin[index] = axis_value;
+            pads[port].reset_origin_counter++;
+        }
+        const f32 axis_status = (axis_value - pads[port].axis_origin[index]) / 110.0f;
+        SetAxis(pads[port].identifier, static_cast<int>(index), axis_status);
+    }
+}
+
+void GCAdapter::AdapterScanThread(std::stop_token stop_token) {
+    Common::SetCurrentThreadName("yuzu:input:ScanGCAdapter");
+    usb_adapter_handle = nullptr;
+    pads = {};
+    while (!stop_token.stop_requested() && !Setup()) {
+        std::this_thread::sleep_for(std::chrono::seconds(2));
+    }
+}
+
+bool GCAdapter::Setup() {
+    constexpr u16 nintendo_vid = 0x057e;
+    constexpr u16 gc_adapter_pid = 0x0337;
+    usb_adapter_handle =
+        std::make_unique<LibUSBDeviceHandle>(libusb_ctx->get(), nintendo_vid, gc_adapter_pid);
+    if (!usb_adapter_handle->get()) {
+        return false;
+    }
+    if (!CheckDeviceAccess()) {
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    libusb_device* const device = libusb_get_device(usb_adapter_handle->get());
+
+    LOG_INFO(Input, "GC adapter is now connected");
+    // GC Adapter found and accessible, registering it
+    if (GetGCEndpoint(device)) {
+        rumble_enabled = true;
+        input_error_counter = 0;
+        output_error_counter = 0;
+
+        std::size_t port = 0;
+        for (GCController& pad : pads) {
+            pad.identifier = {
+                .guid = Common::UUID{""},
+                .port = port++,
+                .pad = 0,
+            };
+            PreSetController(pad.identifier);
+        }
+
+        adapter_input_thread =
+            std::jthread([this](std::stop_token stop_token) { AdapterInputThread(stop_token); });
+        return true;
+    }
+    return false;
+}
+
+bool GCAdapter::CheckDeviceAccess() {
+    // This fixes payload problems from offbrand GCAdapters
+    const s32 control_transfer_error =
+        libusb_control_transfer(usb_adapter_handle->get(), 0x21, 11, 0x0001, 0, nullptr, 0, 1000);
+    if (control_transfer_error < 0) {
+        LOG_ERROR(Input, "libusb_control_transfer failed with error= {}", control_transfer_error);
+    }
+
+    s32 kernel_driver_error = libusb_kernel_driver_active(usb_adapter_handle->get(), 0);
+    if (kernel_driver_error == 1) {
+        kernel_driver_error = libusb_detach_kernel_driver(usb_adapter_handle->get(), 0);
+        if (kernel_driver_error != 0 && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+            LOG_ERROR(Input, "libusb_detach_kernel_driver failed with error = {}",
+                      kernel_driver_error);
+        }
+    }
+
+    if (kernel_driver_error && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    const int interface_claim_error = libusb_claim_interface(usb_adapter_handle->get(), 0);
+    if (interface_claim_error) {
+        LOG_ERROR(Input, "libusb_claim_interface failed with error = {}", interface_claim_error);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+bool GCAdapter::GetGCEndpoint(libusb_device* device) {
+    libusb_config_descriptor* config = nullptr;
+    const int config_descriptor_return = libusb_get_config_descriptor(device, 0, &config);
+    if (config_descriptor_return != LIBUSB_SUCCESS) {
+        LOG_ERROR(Input, "libusb_get_config_descriptor failed with error = {}",
+                  config_descriptor_return);
+        return false;
+    }
+
+    for (u8 ic = 0; ic < config->bNumInterfaces; ic++) {
+        const libusb_interface* interfaceContainer = &config->interface[ic];
+        for (int i = 0; i < interfaceContainer->num_altsetting; i++) {
+            const libusb_interface_descriptor* interface = &interfaceContainer->altsetting[i];
+            for (u8 e = 0; e < interface->bNumEndpoints; e++) {
+                const libusb_endpoint_descriptor* endpoint = &interface->endpoint[e];
+                if ((endpoint->bEndpointAddress & LIBUSB_ENDPOINT_IN) != 0) {
+                    input_endpoint = endpoint->bEndpointAddress;
+                } else {
+                    output_endpoint = endpoint->bEndpointAddress;
+                }
+            }
+        }
+    }
+    // This transfer seems to be responsible for clearing the state of the adapter
+    // Used to clear the "busy" state of when the device is unexpectedly unplugged
+    unsigned char clear_payload = 0x13;
+    libusb_interrupt_transfer(usb_adapter_handle->get(), output_endpoint, &clear_payload,
+                              sizeof(clear_payload), nullptr, 16);
+    return true;
+}
+
+bool GCAdapter::SetRumble(const PadIdentifier& identifier, const Input::VibrationStatus vibration) {
+    const auto mean_amplitude = (vibration.low_amplitude + vibration.high_amplitude) * 0.5f;
+    const auto processed_amplitude =
+        static_cast<u8>((mean_amplitude + std::pow(mean_amplitude, 0.3f)) * 0.5f * 0x8);
+
+    pads[identifier.port].rumble_amplitude = processed_amplitude;
+    return rumble_enabled;
+}
+
+void GCAdapter::UpdateVibrations() {
+    // Use 8 states to keep the switching between on/off fast enough for
+    // a human to feel different vibration strenght
+    // More states == more rumble strengths == slower update time
+    constexpr u8 vibration_states = 8;
+
+    vibration_counter = (vibration_counter + 1) % vibration_states;
+
+    for (GCController& pad : pads) {
+        const bool vibrate = pad.rumble_amplitude > vibration_counter;
+        vibration_changed |= vibrate != pad.enable_vibration;
+        pad.enable_vibration = vibrate;
+    }
+    SendVibrations();
+}
+
+void GCAdapter::SendVibrations() {
+    if (!rumble_enabled || !vibration_changed) {
+        return;
+    }
+    s32 size{};
+    constexpr u8 rumble_command = 0x11;
+    const u8 p1 = pads[0].enable_vibration;
+    const u8 p2 = pads[1].enable_vibration;
+    const u8 p3 = pads[2].enable_vibration;
+    const u8 p4 = pads[3].enable_vibration;
+    std::array<u8, 5> payload = {rumble_command, p1, p2, p3, p4};
+    const int err =
+        libusb_interrupt_transfer(usb_adapter_handle->get(), output_endpoint, payload.data(),
+                                  static_cast<s32>(payload.size()), &size, 16);
+    if (err) {
+        LOG_DEBUG(Input, "Adapter libusb write failed: {}", libusb_error_name(err));
+        if (output_error_counter++ > 5) {
+            LOG_ERROR(Input, "GC adapter output timeout, Rumble disabled");
+            rumble_enabled = false;
+        }
+        return;
+    }
+    output_error_counter = 0;
+    vibration_changed = false;
+}
+
+bool GCAdapter::DeviceConnected(std::size_t port) const {
+    return pads[port].type != ControllerTypes::None;
+}
+
+void GCAdapter::Reset() {
+    adapter_scan_thread = {};
+    adapter_input_thread = {};
+    usb_adapter_handle = nullptr;
+    pads = {};
+    libusb_ctx = nullptr;
+}
+
+std::vector<Common::ParamPackage> GCAdapter::GetInputDevices() const {
+    std::vector<Common::ParamPackage> devices;
+    for (std::size_t port = 0; port < pads.size(); ++port) {
+        if (!DeviceConnected(port)) {
+            continue;
+        }
+        const std::string name = fmt::format("Gamecube Controller {}", port + 1);
+        devices.emplace_back(Common::ParamPackage{
+            {"engine", "gcpad"},
+            {"display", std::move(name)},
+            {"port", std::to_string(port)},
+        });
+    }
+    return devices;
+}
+
+ButtonMapping GCAdapter::GetButtonMappingForDevice(const Common::ParamPackage& params) {
+    // This list is missing ZL/ZR since those are not considered buttons.
+    // We will add those afterwards
+    // This list also excludes any button that can't be really mapped
+    static constexpr std::array<std::pair<Settings::NativeButton::Values, PadButton>, 12>
+        switch_to_gcadapter_button = {
+            std::pair{Settings::NativeButton::A, PadButton::ButtonA},
+            {Settings::NativeButton::B, PadButton::ButtonB},
+            {Settings::NativeButton::X, PadButton::ButtonX},
+            {Settings::NativeButton::Y, PadButton::ButtonY},
+            {Settings::NativeButton::Plus, PadButton::ButtonStart},
+            {Settings::NativeButton::DLeft, PadButton::ButtonLeft},
+            {Settings::NativeButton::DUp, PadButton::ButtonUp},
+            {Settings::NativeButton::DRight, PadButton::ButtonRight},
+            {Settings::NativeButton::DDown, PadButton::ButtonDown},
+            {Settings::NativeButton::SL, PadButton::TriggerL},
+            {Settings::NativeButton::SR, PadButton::TriggerR},
+            {Settings::NativeButton::R, PadButton::TriggerZ},
+        };
+    if (!params.Has("port")) {
+        return {};
+    }
+
+    ButtonMapping mapping{};
+    for (const auto& [switch_button, gcadapter_button] : switch_to_gcadapter_button) {
+        Common::ParamPackage button_params({{"engine", "gcpad"}});
+        button_params.Set("port", params.Get("port", 0));
+        button_params.Set("button", static_cast<int>(gcadapter_button));
+        mapping.insert_or_assign(switch_button, std::move(button_params));
+    }
+
+    // Add the missing bindings for ZL/ZR
+    static constexpr std::array<std::tuple<Settings::NativeButton::Values, PadButton, PadAxes>, 2>
+        switch_to_gcadapter_axis = {
+            std::tuple{Settings::NativeButton::ZL, PadButton::TriggerL, PadAxes::TriggerLeft},
+            {Settings::NativeButton::ZR, PadButton::TriggerR, PadAxes::TriggerRight},
+        };
+    for (const auto& [switch_button, gcadapter_buton, gcadapter_axis] : switch_to_gcadapter_axis) {
+        Common::ParamPackage button_params({{"engine", "gcpad"}});
+        button_params.Set("port", params.Get("port", 0));
+        button_params.Set("button", static_cast<s32>(gcadapter_buton));
+        button_params.Set("axis", static_cast<s32>(gcadapter_axis));
+        button_params.Set("threshold", 0.5f);
+        button_params.Set("range", 1.9f);
+        button_params.Set("direction", "+");
+        mapping.insert_or_assign(switch_button, std::move(button_params));
+    }
+    return mapping;
+}
+
+AnalogMapping GCAdapter::GetAnalogMappingForDevice(const Common::ParamPackage& params) {
+    if (!params.Has("port")) {
+        return {};
+    }
+
+    AnalogMapping mapping = {};
+    Common::ParamPackage left_analog_params;
+    left_analog_params.Set("engine", "gcpad");
+    left_analog_params.Set("port", params.Get("port", 0));
+    left_analog_params.Set("axis_x", static_cast<int>(PadAxes::StickX));
+    left_analog_params.Set("axis_y", static_cast<int>(PadAxes::StickY));
+    mapping.insert_or_assign(Settings::NativeAnalog::LStick, std::move(left_analog_params));
+    Common::ParamPackage right_analog_params;
+    right_analog_params.Set("engine", "gcpad");
+    right_analog_params.Set("port", params.Get("port", 0));
+    right_analog_params.Set("axis_x", static_cast<int>(PadAxes::SubstickX));
+    right_analog_params.Set("axis_y", static_cast<int>(PadAxes::SubstickY));
+    mapping.insert_or_assign(Settings::NativeAnalog::RStick, std::move(right_analog_params));
+    return mapping;
+}
+
+std::string GCAdapter::GetUIName(const Common::ParamPackage& params) const {
+    if (params.Has("button")) {
+        return fmt::format("Button {}", params.Get("button", 0));
+    }
+
+    return "Bad GC Adapter";
+}
+
+} // namespace InputCommon