1 files changed, 398 insertions, 0 deletions
diff --git a/src/input_common/gcadapter/gc_adapter.cpp b/src/input_common/gcadapter/gc_adapter.cpp
new file mode 100644
index 000000000..6d9f4d9eb
--- /dev/null
+++ b/src/input_common/gcadapter/gc_adapter.cpp
@@ -0,0 +1,398 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <thread>
+#include "common/logging/log.h"
+#include "input_common/gcadapter/gc_adapter.h"
+
+namespace GCAdapter {
+
+/// Used to loop through and assign button in poller
+constexpr std::array<PadButton, 12> PadButtonArray{
+    PadButton::PAD_BUTTON_LEFT, PadButton::PAD_BUTTON_RIGHT, PadButton::PAD_BUTTON_DOWN,
+    PadButton::PAD_BUTTON_UP,   PadButton::PAD_TRIGGER_Z,    PadButton::PAD_TRIGGER_R,
+    PadButton::PAD_TRIGGER_L,   PadButton::PAD_BUTTON_A,     PadButton::PAD_BUTTON_B,
+    PadButton::PAD_BUTTON_X,    PadButton::PAD_BUTTON_Y,     PadButton::PAD_BUTTON_START,
+};
+
+Adapter::Adapter() {
+    if (usb_adapter_handle != nullptr) {
+        return;
+    }
+    LOG_INFO(Input, "GC Adapter Initialization started");
+
+    current_status = NO_ADAPTER_DETECTED;
+
+    const int init_res = libusb_init(&libusb_ctx);
+    if (init_res == LIBUSB_SUCCESS) {
+        StartScanThread();
+    } else {
+        LOG_ERROR(Input, "libusb could not be initialized. failed with error = {}", init_res);
+    }
+}
+
+GCPadStatus Adapter::GetPadStatus(int port, const std::array<u8, 37>& adapter_payload) {
+    GCPadStatus pad = {};
+    bool get_origin = false;
+
+    ControllerTypes type = ControllerTypes(adapter_payload[1 + (9 * port)] >> 4);
+    if (type != ControllerTypes::None) {
+        get_origin = true;
+    }
+
+    adapter_controllers_status[port] = type;
+
+    static constexpr std::array<PadButton, 8> b1_buttons{
+        PadButton::PAD_BUTTON_A,    PadButton::PAD_BUTTON_B,    PadButton::PAD_BUTTON_X,
+        PadButton::PAD_BUTTON_Y,    PadButton::PAD_BUTTON_LEFT, PadButton::PAD_BUTTON_RIGHT,
+        PadButton::PAD_BUTTON_DOWN, PadButton::PAD_BUTTON_UP,
+    };
+
+    static constexpr std::array<PadButton, 4> b2_buttons{
+        PadButton::PAD_BUTTON_START,
+        PadButton::PAD_TRIGGER_Z,
+        PadButton::PAD_TRIGGER_R,
+        PadButton::PAD_TRIGGER_L,
+    };
+
+    if (adapter_controllers_status[port] != ControllerTypes::None) {
+        const u8 b1 = adapter_payload[1 + (9 * port) + 1];
+        const u8 b2 = adapter_payload[1 + (9 * port) + 2];
+
+        for (std::size_t i = 0; i < b1_buttons.size(); ++i) {
+            if ((b1 & (1U << i)) != 0) {
+                pad.button |= static_cast<u16>(b1_buttons[i]);
+            }
+        }
+
+        for (std::size_t j = 0; j < b2_buttons.size(); ++j) {
+            if ((b2 & (1U << j)) != 0) {
+                pad.button |= static_cast<u16>(b2_buttons[j]);
+            }
+        }
+
+        if (get_origin) {
+            pad.button |= PAD_GET_ORIGIN;
+        }
+
+        pad.stick_x = adapter_payload[1 + (9 * port) + 3];
+        pad.stick_y = adapter_payload[1 + (9 * port) + 4];
+        pad.substick_x = adapter_payload[1 + (9 * port) + 5];
+        pad.substick_y = adapter_payload[1 + (9 * port) + 6];
+        pad.trigger_left = adapter_payload[1 + (9 * port) + 7];
+        pad.trigger_right = adapter_payload[1 + (9 * port) + 8];
+    }
+    return pad;
+}
+
+void Adapter::PadToState(const GCPadStatus& pad, GCState& state) {
+    for (const auto& button : PadButtonArray) {
+        const u16 button_value = static_cast<u16>(button);
+        state.buttons.insert_or_assign(button_value, pad.button & button_value);
+    }
+
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickX), pad.stick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickY), pad.stick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickX), pad.substick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickY), pad.substick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerLeft), pad.trigger_left);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerRight), pad.trigger_right);
+}
+
+void Adapter::Read() {
+    LOG_DEBUG(Input, "GC Adapter Read() thread started");
+
+    int payload_size_in, payload_size_copy;
+    std::array<u8, 37> adapter_payload;
+    std::array<u8, 37> adapter_payload_copy;
+    std::array<GCPadStatus, 4> pads;
+
+    while (adapter_thread_running) {
+        libusb_interrupt_transfer(usb_adapter_handle, input_endpoint, adapter_payload.data(),
+                                  sizeof(adapter_payload), &payload_size_in, 16);
+        payload_size_copy = 0;
+        // this mutex might be redundant?
+        {
+            std::lock_guard<std::mutex> lk(s_mutex);
+            std::copy(std::begin(adapter_payload), std::end(adapter_payload),
+                      std::begin(adapter_payload_copy));
+            payload_size_copy = payload_size_in;
+        }
+
+        if (payload_size_copy != sizeof(adapter_payload_copy) ||
+            adapter_payload_copy[0] != LIBUSB_DT_HID) {
+            LOG_ERROR(Input, "error reading payload (size: {}, type: {:02x})", payload_size_copy,
+                      adapter_payload_copy[0]);
+            adapter_thread_running = false; // error reading from adapter, stop reading.
+            break;
+        }
+        for (std::size_t port = 0; port < pads.size(); ++port) {
+            pads[port] = GetPadStatus(port, adapter_payload_copy);
+            if (DeviceConnected(port) && configuring) {
+                if (pads[port].button != PAD_GET_ORIGIN) {
+                    pad_queue[port].Push(pads[port]);
+                }
+
+                // Accounting for a threshold here because of some controller variance
+                if (pads[port].stick_x > pads[port].MAIN_STICK_CENTER_X + pads[port].THRESHOLD ||
+                    pads[port].stick_x < pads[port].MAIN_STICK_CENTER_X - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::StickX;
+                    pads[port].axis_value = pads[port].stick_x;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].stick_y > pads[port].MAIN_STICK_CENTER_Y + pads[port].THRESHOLD ||
+                    pads[port].stick_y < pads[port].MAIN_STICK_CENTER_Y - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::StickY;
+                    pads[port].axis_value = pads[port].stick_y;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].substick_x > pads[port].C_STICK_CENTER_X + pads[port].THRESHOLD ||
+                    pads[port].substick_x < pads[port].C_STICK_CENTER_X - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::SubstickX;
+                    pads[port].axis_value = pads[port].substick_x;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].substick_y > pads[port].C_STICK_CENTER_Y + pads[port].THRESHOLD ||
+                    pads[port].substick_y < pads[port].C_STICK_CENTER_Y - pads[port].THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::SubstickY;
+                    pads[port].axis_value = pads[port].substick_y;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].trigger_left > pads[port].TRIGGER_THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::TriggerLeft;
+                    pads[port].axis_value = pads[port].trigger_left;
+                    pad_queue[port].Push(pads[port]);
+                }
+                if (pads[port].trigger_right > pads[port].TRIGGER_THRESHOLD) {
+                    pads[port].axis = GCAdapter::PadAxes::TriggerRight;
+                    pads[port].axis_value = pads[port].trigger_right;
+                    pad_queue[port].Push(pads[port]);
+                }
+            }
+            PadToState(pads[port], state[port]);
+        }
+        std::this_thread::yield();
+    }
+}
+
+void Adapter::ScanThreadFunc() {
+    LOG_INFO(Input, "GC Adapter scanning thread started");
+
+    while (detect_thread_running) {
+        if (usb_adapter_handle == nullptr) {
+            std::lock_guard<std::mutex> lk(initialization_mutex);
+            Setup();
+        }
+        std::this_thread::sleep_for(std::chrono::milliseconds(500));
+    }
+}
+
+void Adapter::StartScanThread() {
+    if (detect_thread_running) {
+        return;
+    }
+    if (!libusb_ctx) {
+        return;
+    }
+
+    detect_thread_running = true;
+    detect_thread = std::thread([=] { ScanThreadFunc(); });
+}
+
+void Adapter::StopScanThread() {
+    detect_thread_running = false;
+    detect_thread.join();
+}
+
+void Adapter::Setup() {
+    // Reset the error status in case the adapter gets unplugged
+    if (current_status < 0) {
+        current_status = NO_ADAPTER_DETECTED;
+    }
+
+    adapter_controllers_status.fill(ControllerTypes::None);
+
+    // pointer to list of connected usb devices
+    libusb_device** devices{};
+
+    // populate the list of devices, get the count
+    const ssize_t device_count = libusb_get_device_list(libusb_ctx, &devices);
+    if (device_count < 0) {
+        LOG_ERROR(Input, "libusb_get_device_list failed with error: {}", device_count);
+        detect_thread_running = false; // Stop the loop constantly checking for gc adapter
+        // TODO: For hotplug+gc adapter checkbox implementation, revert this.
+        return;
+    }
+
+    if (devices != nullptr) {
+        for (std::size_t index = 0; index < device_count; ++index) {
+            if (CheckDeviceAccess(devices[index])) {
+                // GC Adapter found and accessible, registering it
+                GetGCEndpoint(devices[index]);
+                break;
+            }
+        }
+        libusb_free_device_list(devices, 1);
+    }
+}
+
+bool Adapter::CheckDeviceAccess(libusb_device* device) {
+    libusb_device_descriptor desc;
+    const int get_descriptor_error = libusb_get_device_descriptor(device, &desc);
+    if (get_descriptor_error) {
+        // could not acquire the descriptor, no point in trying to use it.
+        LOG_ERROR(Input, "libusb_get_device_descriptor failed with error: {}",
+                  get_descriptor_error);
+        return false;
+    }
+
+    if (desc.idVendor != 0x057e || desc.idProduct != 0x0337) {
+        // This isn't the device we are looking for.
+        return false;
+    }
+    const int open_error = libusb_open(device, &usb_adapter_handle);
+
+    if (open_error == LIBUSB_ERROR_ACCESS) {
+        LOG_ERROR(Input, "Yuzu can not gain access to this device: ID {:04X}:{:04X}.",
+                  desc.idVendor, desc.idProduct);
+        return false;
+    }
+    if (open_error) {
+        LOG_ERROR(Input, "libusb_open failed to open device with error = {}", open_error);
+        return false;
+    }
+
+    int kernel_driver_error = libusb_kernel_driver_active(usb_adapter_handle, 0);
+    if (kernel_driver_error == 1) {
+        kernel_driver_error = libusb_detach_kernel_driver(usb_adapter_handle, 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) {
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    const int interface_claim_error = libusb_claim_interface(usb_adapter_handle, 0);
+    if (interface_claim_error) {
+        LOG_ERROR(Input, "libusb_claim_interface failed with error = {}", interface_claim_error);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+void Adapter::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;
+    }
+
+    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) {
+                    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, output_endpoint, &clear_payload,
+                              sizeof(clear_payload), nullptr, 16);
+
+    adapter_thread_running = true;
+    current_status = ADAPTER_DETECTED;
+    adapter_input_thread = std::thread([=] { Read(); }); // Read input
+}
+
+Adapter::~Adapter() {
+    StopScanThread();
+    Reset();
+}
+
+void Adapter::Reset() {
+    std::unique_lock<std::mutex> lock(initialization_mutex, std::defer_lock);
+    if (!lock.try_lock()) {
+        return;
+    }
+    if (current_status != ADAPTER_DETECTED) {
+        return;
+    }
+
+    if (adapter_thread_running) {
+        adapter_thread_running = false;
+    }
+    adapter_input_thread.join();
+
+    adapter_controllers_status.fill(ControllerTypes::None);
+    current_status = NO_ADAPTER_DETECTED;
+
+    if (usb_adapter_handle) {
+        libusb_release_interface(usb_adapter_handle, 1);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+    }
+
+    if (libusb_ctx) {
+        libusb_exit(libusb_ctx);
+    }
+}
+
+bool Adapter::DeviceConnected(int port) {
+    return adapter_controllers_status[port] != ControllerTypes::None;
+}
+
+void Adapter::ResetDeviceType(int port) {
+    adapter_controllers_status[port] = ControllerTypes::None;
+}
+
+void Adapter::BeginConfiguration() {
+    for (auto& pq : pad_queue) {
+        pq.Clear();
+    }
+    configuring = true;
+}
+
+void Adapter::EndConfiguration() {
+    for (auto& pq : pad_queue) {
+        pq.Clear();
+    }
+    configuring = false;
+}
+
+std::array<Common::SPSCQueue<GCPadStatus>, 4>& Adapter::GetPadQueue() {
+    return pad_queue;
+}
+
+const std::array<Common::SPSCQueue<GCPadStatus>, 4>& Adapter::GetPadQueue() const {
+    return pad_queue;
+}
+
+std::array<GCState, 4>& Adapter::GetPadState() {
+    return state;
+}
+
+const std::array<GCState, 4>& Adapter::GetPadState() const {
+    return state;
+}
+
+} // namespace GCAdapter