yuzu/src/input_common/helpers/joycon_protocol/nfc.cpp

// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include <thread>
#include "common/logging/log.h"
#include "input_common/helpers/joycon_protocol/nfc.h"

namespace InputCommon::Joycon {

NfcProtocol::NfcProtocol(std::shared_ptr<JoyconHandle> handle)
    : JoyconCommonProtocol(std::move(handle)) {}

DriverResult NfcProtocol::EnableNfc() {
    LOG_INFO(Input, "Enable NFC");
    ScopedSetBlocking sb(this);
    DriverResult result{DriverResult::Success};

    if (result == DriverResult::Success) {
        result = SetReportMode(ReportMode::NFC_IR_MODE_60HZ);
    }
    if (result == DriverResult::Success) {
        result = EnableMCU(true);
    }
    if (result == DriverResult::Success) {
        result = WaitSetMCUMode(ReportMode::NFC_IR_MODE_60HZ, MCUMode::Standby);
    }
    if (result == DriverResult::Success) {
        const MCUConfig config{
            .command = MCUCommand::ConfigureMCU,
            .sub_command = MCUSubCommand::SetMCUMode,
            .mode = MCUMode::NFC,
            .crc = {},
        };

        result = ConfigureMCU(config);
    }

    return result;
}

DriverResult NfcProtocol::DisableNfc() {
    LOG_DEBUG(Input, "Disable NFC");
    ScopedSetBlocking sb(this);
    DriverResult result{DriverResult::Success};

    if (result == DriverResult::Success) {
        result = EnableMCU(false);
    }

    is_enabled = false;

    return result;
}

DriverResult NfcProtocol::StartNFCPollingMode() {
    LOG_DEBUG(Input, "Start NFC pooling Mode");
    ScopedSetBlocking sb(this);
    DriverResult result{DriverResult::Success};
    TagFoundData tag_data{};

    if (result == DriverResult::Success) {
        result = WaitSetMCUMode(ReportMode::NFC_IR_MODE_60HZ, MCUMode::NFC);
    }
    if (result == DriverResult::Success) {
        result = WaitUntilNfcIsReady();
    }
    if (result == DriverResult::Success) {
        is_enabled = true;
    }

    return result;
}

DriverResult NfcProtocol::ScanAmiibo(std::vector<u8>& data) {
    if (update_counter++ < AMIIBO_UPDATE_DELAY) {
        return DriverResult::Delayed;
    }
    update_counter = 0;

    LOG_DEBUG(Input, "Start NFC pooling Mode");
    ScopedSetBlocking sb(this);
    DriverResult result{DriverResult::Success};
    TagFoundData tag_data{};

    if (result == DriverResult::Success) {
        result = StartPolling(tag_data);
    }
    if (result == DriverResult::Success) {
        result = ReadTag(tag_data);
    }
    if (result == DriverResult::Success) {
        result = WaitUntilNfcIsReady();
    }
    if (result == DriverResult::Success) {
        result = StartPolling(tag_data, 7);
    }
    if (result == DriverResult::Success) {
        result = GetAmiiboData(data);
    }

    return result;
}

bool NfcProtocol::HasAmiibo() {
    ScopedSetBlocking sb(this);
    DriverResult result{DriverResult::Success};
    TagFoundData tag_data{};

    if (result == DriverResult::Success) {
        result = StartPolling(tag_data);
    }

    return result == DriverResult::Success;
}

DriverResult NfcProtocol::WaitUntilNfcIsReady() {
    constexpr std::size_t timeout_limit = 10;
    MCUCommandResponse output{};
    std::size_t tries = 0;

    do {
        auto result = SendStartWaitingRecieveRequest(output);

        if (result != DriverResult::Success) {
            return result;
        }
        if (tries++ > timeout_limit) {
            return DriverResult::Timeout;
        }
    } while (output.mcu_report != MCUReport::NFCState ||
             (output.mcu_data[1] << 8) + output.mcu_data[0] != 0x0500 ||
             output.mcu_data[5] != 0x31 || output.mcu_data[6] != 0x00);

    return DriverResult::Success;
}

DriverResult NfcProtocol::StartPolling(TagFoundData& data, std::size_t timeout_limit) {
    LOG_DEBUG(Input, "Start Polling for tag");
    MCUCommandResponse output{};
    std::size_t tries = 0;

    do {
        const auto result = SendStartPollingRequest(output);
        if (result != DriverResult::Success) {
            return result;
        }
        if (tries++ > timeout_limit) {
            return DriverResult::Timeout;
        }
    } while (output.mcu_report != MCUReport::NFCState ||
             (output.mcu_data[1] << 8) + output.mcu_data[0] != 0x0500 ||
             output.mcu_data[6] != 0x09);

    data.type = output.mcu_data[12];
    data.uuid.resize(output.mcu_data[14]);
    memcpy(data.uuid.data(), output.mcu_data.data() + 15, data.uuid.size());

    return DriverResult::Success;
}

DriverResult NfcProtocol::ReadTag(const TagFoundData& data) {
    constexpr std::size_t timeout_limit = 10;
    MCUCommandResponse output{};
    std::size_t tries = 0;

    std::string uuid_string;
    for (auto& content : data.uuid) {
        uuid_string += fmt::format(" {:02x}", content);
    }

    LOG_INFO(Input, "Tag detected, type={}, uuid={}", data.type, uuid_string);

    tries = 0;
    NFCPages ntag_pages = NFCPages::Block0;
    // Read Tag data
    while (true) {
        auto result = SendReadAmiiboRequest(output, ntag_pages);
        const auto nfc_status = static_cast<NFCStatus>(output.mcu_data[6]);

        if (result != DriverResult::Success) {
            return result;
        }

        if ((output.mcu_report == MCUReport::NFCReadData ||
             output.mcu_report == MCUReport::NFCState) &&
            nfc_status == NFCStatus::TagLost) {
            return DriverResult::ErrorReadingData;
        }

        if (output.mcu_report == MCUReport::NFCReadData && output.mcu_data[1] == 0x07 &&
            output.mcu_data[2] == 0x01) {
            if (data.type != 2) {
                continue;
            }
            switch (output.mcu_data[24]) {
            case 0:
                ntag_pages = NFCPages::Block135;
                break;
            case 3:
                ntag_pages = NFCPages::Block45;
                break;
            case 4:
                ntag_pages = NFCPages::Block231;
                break;
            default:
                return DriverResult::ErrorReadingData;
            }
            continue;
        }

        if (output.mcu_report == MCUReport::NFCState && nfc_status == NFCStatus::LastPackage) {
            // finished
            SendStopPollingRequest(output);
            return DriverResult::Success;
        }

        // Ignore other state reports
        if (output.mcu_report == MCUReport::NFCState) {
            continue;
        }

        if (tries++ > timeout_limit) {
            return DriverResult::Timeout;
        }
    }

    return DriverResult::Success;
}

DriverResult NfcProtocol::GetAmiiboData(std::vector<u8>& ntag_data) {
    constexpr std::size_t timeout_limit = 10;
    MCUCommandResponse output{};
    std::size_t tries = 0;

    NFCPages ntag_pages = NFCPages::Block135;
    std::size_t ntag_buffer_pos = 0;
    // Read Tag data
    while (true) {
        auto result = SendReadAmiiboRequest(output, ntag_pages);
        const auto nfc_status = static_cast<NFCStatus>(output.mcu_data[6]);

        if (result != DriverResult::Success) {
            return result;
        }

        if ((output.mcu_report == MCUReport::NFCReadData ||
             output.mcu_report == MCUReport::NFCState) &&
            nfc_status == NFCStatus::TagLost) {
            return DriverResult::ErrorReadingData;
        }

        if (output.mcu_report == MCUReport::NFCReadData && output.mcu_data[1] == 0x07) {
            std::size_t payload_size = (output.mcu_data[4] << 8 | output.mcu_data[5]) & 0x7FF;
            if (output.mcu_data[2] == 0x01) {
                memcpy(ntag_data.data() + ntag_buffer_pos, output.mcu_data.data() + 66,
                       payload_size - 60);
                ntag_buffer_pos += payload_size - 60;
            } else {
                memcpy(ntag_data.data() + ntag_buffer_pos, output.mcu_data.data() + 6,
                       payload_size);
            }
            continue;
        }

        if (output.mcu_report == MCUReport::NFCState && nfc_status == NFCStatus::LastPackage) {
            LOG_INFO(Input, "Finished reading amiibo");
            return DriverResult::Success;
        }

        // Ignore other state reports
        if (output.mcu_report == MCUReport::NFCState) {
            continue;
        }

        if (tries++ > timeout_limit) {
            return DriverResult::Timeout;
        }
    }

    return DriverResult::Success;
}

DriverResult NfcProtocol::SendStartPollingRequest(MCUCommandResponse& output) {
    NFCRequestState request{
        .command_argument = NFCReadCommand::StartPolling,
        .packet_id = 0x0,
        .packet_flag = MCUPacketFlag::LastCommandPacket,
        .data_length = sizeof(NFCPollingCommandData),
        .nfc_polling =
            {
                .enable_mifare = 0x01,
                .unknown_1 = 0x00,
                .unknown_2 = 0x00,
                .unknown_3 = 0x2c,
                .unknown_4 = 0x01,
            },
        .crc = {},
    };

    std::array<u8, sizeof(NFCRequestState)> request_data{};
    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
                       output);
}

DriverResult NfcProtocol::SendStopPollingRequest(MCUCommandResponse& output) {
    NFCRequestState request{
        .command_argument = NFCReadCommand::StopPolling,
        .packet_id = 0x0,
        .packet_flag = MCUPacketFlag::LastCommandPacket,
        .data_length = 0,
        .raw_data = {},
        .crc = {},
    };

    std::array<u8, sizeof(NFCRequestState)> request_data{};
    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
                       output);
}

DriverResult NfcProtocol::SendStartWaitingRecieveRequest(MCUCommandResponse& output) {
    NFCRequestState request{
        .command_argument = NFCReadCommand::StartWaitingRecieve,
        .packet_id = 0x0,
        .packet_flag = MCUPacketFlag::LastCommandPacket,
        .data_length = 0,
        .raw_data = {},
        .crc = {},
    };

    std::vector<u8> request_data(sizeof(NFCRequestState));
    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
                       output);
}

DriverResult NfcProtocol::SendReadAmiiboRequest(MCUCommandResponse& output, NFCPages ntag_pages) {
    NFCRequestState request{
        .command_argument = NFCReadCommand::Ntag,
        .packet_id = 0x0,
        .packet_flag = MCUPacketFlag::LastCommandPacket,
        .data_length = sizeof(NFCReadCommandData),
        .nfc_read =
            {
                .unknown = 0xd0,
                .uuid_length = 0x07,
                .unknown_2 = 0x00,
                .uid = {},
                .tag_type = NFCTagType::AllTags,
                .read_block = GetReadBlockCommand(ntag_pages),
            },
        .crc = {},
    };

    std::array<u8, sizeof(NFCRequestState)> request_data{};
    memcpy(request_data.data(), &request, sizeof(NFCRequestState));
    request_data[36] = CalculateMCU_CRC8(request_data.data(), 36);
    return SendMCUData(ReportMode::NFC_IR_MODE_60HZ, MCUSubCommand::ReadDeviceMode, request_data,
                       output);
}

NFCReadBlockCommand NfcProtocol::GetReadBlockCommand(NFCPages pages) const {
    switch (pages) {
    case NFCPages::Block0:
        return {
            .block_count = 1,
        };
    case NFCPages::Block45:
        return {
            .block_count = 1,
            .blocks =
                {
                    NFCReadBlock{0x00, 0x2C},
                },
        };
    case NFCPages::Block135:
        return {
            .block_count = 3,
            .blocks =
                {
                    NFCReadBlock{0x00, 0x3b},
                    {0x3c, 0x77},
                    {0x78, 0x86},
                },
        };
    case NFCPages::Block231:
        return {
            .block_count = 4,
            .blocks =
                {
                    NFCReadBlock{0x00, 0x3b},
                    {0x3c, 0x77},
                    {0x78, 0x83},
                    {0xb4, 0xe6},
                },
        };
    default:
        return {};
    };
}

bool NfcProtocol::IsEnabled() const {
    return is_enabled;
}

} // namespace InputCommon::Joycon