3 files changed, 434 insertions, 0 deletions

diff --git a/src/input_common/CMakeLists.txt b/src/input_common/CMakeLists.txt
index 41885d0d2..566be9f90 100644
--- a/src/input_common/CMakeLists.txt
+++ b/src/input_common/CMakeLists.txt
@@ -57,6 +57,8 @@ if (ENABLE_SDL2)
         drivers/sdl_driver.h
         helpers/joycon_driver.cpp
         helpers/joycon_driver.h
+        helpers/joycon_protocol/common_protocol.cpp
+        helpers/joycon_protocol/common_protocol.h
         helpers/joycon_protocol/joycon_types.h
     )
     target_link_libraries(input_common PRIVATE SDL2::SDL2)
diff --git a/src/input_common/helpers/joycon_protocol/common_protocol.cpp b/src/input_common/helpers/joycon_protocol/common_protocol.cpp
new file mode 100644
index 000000000..43a036e02
--- /dev/null
+++ b/src/input_common/helpers/joycon_protocol/common_protocol.cpp
@@ -0,0 +1,286 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/logging/log.h"
+#include "input_common/helpers/joycon_protocol/common_protocol.h"
+
+namespace InputCommon::Joycon {
+JoyconCommonProtocol::JoyconCommonProtocol(std::shared_ptr<JoyconHandle> hidapi_handle_)
+    : hidapi_handle{hidapi_handle_} {}
+
+u8 JoyconCommonProtocol::GetCounter() {
+    hidapi_handle->packet_counter = (hidapi_handle->packet_counter + 1) & 0x0F;
+    return hidapi_handle->packet_counter;
+}
+
+void JoyconCommonProtocol::SetBlocking() {
+    SDL_hid_set_nonblocking(hidapi_handle->handle, 0);
+}
+
+void JoyconCommonProtocol::SetNonBlocking() {
+    SDL_hid_set_nonblocking(hidapi_handle->handle, 1);
+}
+
+DriverResult JoyconCommonProtocol::GetDeviceType(ControllerType& controller_type) {
+    std::vector<u8> buffer;
+    const auto result = ReadSPI(CalAddr::DEVICE_TYPE, 1, buffer);
+    controller_type = ControllerType::None;
+
+    if (result == DriverResult::Success) {
+        controller_type = static_cast<ControllerType>(buffer[0]);
+        // Fallback to 3rd party pro controllers
+        if (controller_type == ControllerType::None) {
+            controller_type = ControllerType::Pro;
+        }
+    }
+
+    return result;
+}
+
+DriverResult JoyconCommonProtocol::CheckDeviceAccess(SDL_hid_device_info* device_info) {
+    ControllerType controller_type{ControllerType::None};
+    const auto result = GetDeviceType(controller_type);
+    if (result != DriverResult::Success || controller_type == ControllerType::None) {
+        return DriverResult::UnsupportedControllerType;
+    }
+
+    hidapi_handle->handle =
+        SDL_hid_open(device_info->vendor_id, device_info->product_id, device_info->serial_number);
+
+    if (!hidapi_handle->handle) {
+        LOG_ERROR(Input, "Yuzu can't gain access to this device: ID {:04X}:{:04X}.",
+                  device_info->vendor_id, device_info->product_id);
+        return DriverResult::HandleInUse;
+    }
+
+    SetNonBlocking();
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::SetReportMode(ReportMode report_mode) {
+    const std::vector<u8> buffer{static_cast<u8>(report_mode)};
+    std::vector<u8> output;
+    return SendSubCommand(SubCommand::SET_REPORT_MODE, buffer, output);
+}
+
+DriverResult JoyconCommonProtocol::SendData(std::span<const u8> buffer) {
+    const auto result = SDL_hid_write(hidapi_handle->handle, buffer.data(), buffer.size());
+
+    if (result == -1) {
+        return DriverResult::ErrorWritingData;
+    }
+
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::GetSubCommandResponse(SubCommand sc, std::vector<u8>& output) {
+    constexpr int timeout_mili = 100;
+    constexpr int MaxTries = 10;
+    int tries = 0;
+    output.resize(MaxSubCommandResponseSize);
+
+    do {
+        int result = SDL_hid_read_timeout(hidapi_handle->handle, output.data(),
+                                          MaxSubCommandResponseSize, timeout_mili);
+
+        if (result < 1) {
+            LOG_ERROR(Input, "No response from joycon");
+        }
+        if (tries++ > MaxTries) {
+            return DriverResult::Timeout;
+        }
+    } while (output[0] != 0x21 && output[14] != static_cast<u8>(sc));
+
+    if (output[0] != 0x21 && output[14] != static_cast<u8>(sc)) {
+        return DriverResult::WrongReply;
+    }
+
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::SendSubCommand(SubCommand sc, std::span<const u8> buffer,
+                                                  std::vector<u8>& output) {
+    std::vector<u8> local_buffer(MaxResponseSize);
+
+    local_buffer[0] = static_cast<u8>(OutputReport::RUMBLE_AND_SUBCMD);
+    local_buffer[1] = GetCounter();
+    local_buffer[10] = static_cast<u8>(sc);
+    for (std::size_t i = 0; i < buffer.size(); ++i) {
+        local_buffer[11 + i] = buffer[i];
+    }
+
+    auto result = SendData(local_buffer);
+
+    if (result != DriverResult::Success) {
+        return result;
+    }
+
+    result = GetSubCommandResponse(sc, output);
+
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::SendVibrationReport(std::span<const u8> buffer) {
+    std::vector<u8> local_buffer(MaxResponseSize);
+
+    local_buffer[0] = static_cast<u8>(Joycon::OutputReport::RUMBLE_ONLY);
+    local_buffer[1] = GetCounter();
+
+    memcpy(local_buffer.data() + 2, buffer.data(), buffer.size());
+
+    return SendData(local_buffer);
+}
+
+DriverResult JoyconCommonProtocol::ReadSPI(CalAddr addr, u8 size, std::vector<u8>& output) {
+    constexpr std::size_t MaxTries = 10;
+    std::size_t tries = 0;
+    std::vector<u8> buffer = {0x00, 0x00, 0x00, 0x00, size};
+    std::vector<u8> local_buffer(size + 20);
+
+    buffer[0] = static_cast<u8>(static_cast<u16>(addr) & 0x00FF);
+    buffer[1] = static_cast<u8>((static_cast<u16>(addr) & 0xFF00) >> 8);
+    do {
+        const auto result = SendSubCommand(SubCommand::SPI_FLASH_READ, buffer, local_buffer);
+        if (result != DriverResult::Success) {
+            return result;
+        }
+
+        if (tries++ > MaxTries) {
+            return DriverResult::Timeout;
+        }
+    } while (local_buffer[15] != buffer[0] || local_buffer[16] != buffer[1]);
+
+    // Remove header from output
+    output = std::vector<u8>(local_buffer.begin() + 20, local_buffer.begin() + 20 + size);
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::EnableMCU(bool enable) {
+    std::vector<u8> output;
+
+    const std::vector<u8> mcu_state{static_cast<u8>(enable ? 1 : 0)};
+    const auto result = SendSubCommand(SubCommand::SET_MCU_STATE, mcu_state, output);
+
+    if (result != DriverResult::Success) {
+        LOG_ERROR(Input, "SendMCUData failed with error {}", result);
+    }
+
+    return result;
+}
+
+DriverResult JoyconCommonProtocol::ConfigureMCU(const MCUConfig& config) {
+    LOG_DEBUG(Input, "ConfigureMCU");
+    std::vector<u8> output;
+
+    std::array<u8, sizeof(MCUConfig)> config_buffer;
+    memcpy(config_buffer.data(), &config, sizeof(MCUConfig));
+    config_buffer[37] = CalculateMCU_CRC8(config_buffer.data() + 1, 36);
+
+    const auto result = SendSubCommand(SubCommand::SET_MCU_CONFIG, config_buffer, output);
+
+    if (result != DriverResult::Success) {
+        LOG_ERROR(Input, "Set MCU config failed with error {}", result);
+    }
+
+    return result;
+}
+
+DriverResult JoyconCommonProtocol::GetMCUDataResponse(ReportMode report_mode_,
+                                                      std::vector<u8>& output) {
+    const int report_mode = static_cast<u8>(report_mode_);
+    constexpr int TimeoutMili = 200;
+    constexpr int MaxTries = 9;
+    int tries = 0;
+    output.resize(0x170);
+
+    do {
+        int result = SDL_hid_read_timeout(hidapi_handle->handle, output.data(), 0x170, TimeoutMili);
+
+        if (result < 1) {
+            LOG_ERROR(Input, "No response from joycon attempt {}", tries);
+        }
+        if (tries++ > MaxTries) {
+            return DriverResult::Timeout;
+        }
+    } while (output[0] != report_mode || output[49] == 0xFF);
+
+    if (output[0] != report_mode || output[49] == 0xFF) {
+        return DriverResult::WrongReply;
+    }
+
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::SendMCUData(ReportMode report_mode, SubCommand sc,
+                                               std::span<const u8> buffer,
+                                               std::vector<u8>& output) {
+    std::vector<u8> local_buffer(MaxResponseSize);
+
+    local_buffer[0] = static_cast<u8>(OutputReport::MCU_DATA);
+    local_buffer[1] = GetCounter();
+    local_buffer[9] = static_cast<u8>(sc);
+    for (std::size_t i = 0; i < buffer.size(); ++i) {
+        local_buffer[10 + i] = buffer[i];
+    }
+
+    auto result = SendData(local_buffer);
+
+    if (result != DriverResult::Success) {
+        return result;
+    }
+
+    result = GetMCUDataResponse(report_mode, output);
+
+    return DriverResult::Success;
+}
+
+DriverResult JoyconCommonProtocol::WaitSetMCUMode(ReportMode report_mode, MCUMode mode) {
+    std::vector<u8> output;
+    constexpr std::size_t MaxTries{8};
+    std::size_t tries{};
+
+    do {
+        const std::vector<u8> mcu_data{static_cast<u8>(MCUMode::Standby)};
+        const auto result = SendMCUData(report_mode, SubCommand::STATE, mcu_data, output);
+
+        if (result != DriverResult::Success) {
+            return result;
+        }
+
+        if (tries++ > MaxTries) {
+            return DriverResult::WrongReply;
+        }
+    } while (output[49] != 1 || output[56] != static_cast<u8>(mode));
+
+    return DriverResult::Success;
+}
+
+// crc-8-ccitt / polynomial 0x07 look up table
+static constexpr uint8_t mcu_crc8_table[256] = {
+    0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
+    0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
+    0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
+    0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
+    0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
+    0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
+    0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
+    0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
+    0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
+    0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
+    0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
+    0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
+    0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
+    0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
+    0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
+    0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3};
+
+u8 JoyconCommonProtocol::CalculateMCU_CRC8(u8* buffer, u8 size) const {
+    u8 crc8 = 0x0;
+
+    for (int i = 0; i < size; ++i) {
+        crc8 = mcu_crc8_table[(u8)(crc8 ^ buffer[i])];
+    }
+    return crc8;
+}
+
+} // namespace InputCommon::Joycon
diff --git a/src/input_common/helpers/joycon_protocol/common_protocol.h b/src/input_common/helpers/joycon_protocol/common_protocol.h
new file mode 100644
index 000000000..a65e4aa76
--- /dev/null
+++ b/src/input_common/helpers/joycon_protocol/common_protocol.h
@@ -0,0 +1,146 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+// Based on dkms-hid-nintendo implementation, CTCaer joycon toolkit and dekuNukem reverse
+// engineering https://github.com/nicman23/dkms-hid-nintendo/blob/master/src/hid-nintendo.c
+// https://github.com/CTCaer/jc_toolkit
+// https://github.com/dekuNukem/Nintendo_Switch_Reverse_Engineering
+
+#pragma once
+
+#include <memory>
+#include <span>
+#include <vector>
+
+#include "common/common_types.h"
+#include "input_common/helpers/joycon_protocol/joycon_types.h"
+
+namespace InputCommon::Joycon {
+
+/// Joycon driver functions that handle low level communication
+class JoyconCommonProtocol {
+public:
+    explicit JoyconCommonProtocol(std::shared_ptr<JoyconHandle> hidapi_handle_);
+
+    /**
+     * Sets handle to blocking. In blocking mode, SDL_hid_read() will wait (block) until there is
+     * data to read before returning.
+     */
+    void SetBlocking();
+
+    /**
+     * Sets handle to non blocking. In non-blocking mode calls to SDL_hid_read() will return
+     * immediately with a value of 0 if there is no data to be read
+     */
+    void SetNonBlocking();
+
+    /**
+     * Sends a request to obtain the joycon type from device
+     * @returns controller type of the joycon
+     */
+    DriverResult GetDeviceType(ControllerType& controller_type);
+
+    /**
+     * Verifies and sets the joycon_handle if device is valid
+     * @param device info from the driver
+     * @returns success if the device is valid
+     */
+    DriverResult CheckDeviceAccess(SDL_hid_device_info* device);
+
+    /**
+     * Sends a request to set the polling mode of the joycon
+     * @param report_mode polling mode to be set
+     */
+    DriverResult SetReportMode(Joycon::ReportMode report_mode);
+
+    /**
+     * Sends data to the joycon device
+     * @param buffer data to be send
+     */
+    DriverResult SendData(std::span<const u8> buffer);
+
+    /**
+     * Waits for incoming data of the joycon device that matchs the subcommand
+     * @param sub_command type of data to be returned
+     * @returns a buffer containing the responce
+     */
+    DriverResult GetSubCommandResponse(SubCommand sub_command, std::vector<u8>& output);
+
+    /**
+     * Sends a sub command to the device and waits for it's reply
+     * @param sc sub command to be send
+     * @param buffer data to be send
+     * @returns output buffer containing the responce
+     */
+    DriverResult SendSubCommand(SubCommand sc, std::span<const u8> buffer, std::vector<u8>& output);
+
+    /**
+     * Sends vibration data to the joycon
+     * @param buffer data to be send
+     */
+    DriverResult SendVibrationReport(std::span<const u8> buffer);
+
+    /**
+     * Reads the SPI memory stored on the joycon
+     * @param Initial address location
+     * @param size in bytes to be read
+     * @returns output buffer containing the responce
+     */
+    DriverResult ReadSPI(CalAddr addr, u8 size, std::vector<u8>& output);
+
+    /**
+     * Enables MCU chip on the joycon
+     * @param enable if true the chip will be enabled
+     */
+    DriverResult EnableMCU(bool enable);
+
+    /**
+     * Configures the MCU to the correspoinding mode
+     * @param MCUConfig configuration
+     */
+    DriverResult ConfigureMCU(const MCUConfig& config);
+
+    /**
+     * Waits until there's MCU data available. On timeout returns error
+     * @param report mode of the expected reply
+     * @returns a buffer containing the responce
+     */
+    DriverResult GetMCUDataResponse(ReportMode report_mode_, std::vector<u8>& output);
+
+    /**
+     * Sends data to the MCU chip and waits for it's reply
+     * @param report mode of the expected reply
+     * @param sub command to be send
+     * @param buffer data to be send
+     * @returns output buffer containing the responce
+     */
+    DriverResult SendMCUData(ReportMode report_mode, SubCommand sc, std::span<const u8> buffer,
+                             std::vector<u8>& output);
+
+    /**
+     * Wait's until the MCU chip is on the specified mode
+     * @param report mode of the expected reply
+     * @param MCUMode configuration
+     */
+    DriverResult WaitSetMCUMode(ReportMode report_mode, MCUMode mode);
+
+    /**
+     * Calculates the checksum from the MCU data
+     * @param buffer containing the data to be send
+     * @param size of the buffer in bytes
+     * @returns byte with the correct checksum
+     */
+    u8 CalculateMCU_CRC8(u8* buffer, u8 size) const;
+
+private:
+    /**
+     * Increments and returns the packet counter of the handle
+     * @param joycon_handle device to send the data
+     * @returns packet counter value
+     */
+    u8 GetCounter();
+
+    std::shared_ptr<JoyconHandle> hidapi_handle;
+};
+
+} // namespace InputCommon::Joycon