2 files changed, 162 insertions, 0 deletions

diff --git a/src/input_common/drivers/virtual_amiibo.cpp b/src/input_common/drivers/virtual_amiibo.cpp
new file mode 100644
index 000000000..8fadb1322
--- /dev/null
+++ b/src/input_common/drivers/virtual_amiibo.cpp
@@ -0,0 +1,101 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <cstring>
+#include <fmt/format.h>
+
+#include "common/fs/file.h"
+#include "common/fs/fs.h"
+#include "common/fs/path_util.h"
+#include "common/logging/log.h"
+#include "common/settings.h"
+#include "input_common/drivers/virtual_amiibo.h"
+
+namespace InputCommon {
+constexpr PadIdentifier identifier = {
+    .guid = Common::UUID{},
+    .port = 0,
+    .pad = 0,
+};
+
+VirtualAmiibo::VirtualAmiibo(std::string input_engine_) : InputEngine(std::move(input_engine_)) {}
+
+VirtualAmiibo::~VirtualAmiibo() {}
+
+Common::Input::PollingError VirtualAmiibo::SetPollingMode(
+    [[maybe_unused]] const PadIdentifier& identifier_,
+    const Common::Input::PollingMode polling_mode_) {
+    polling_mode = polling_mode_;
+
+    if (polling_mode == Common::Input::PollingMode::NFC) {
+        if (state == State::Initialized) {
+            state = State::WaitingForAmiibo;
+        }
+    } else {
+        if (state == State::AmiiboIsOpen) {
+            CloseAmiibo();
+        }
+    }
+
+    return Common::Input::PollingError::None;
+}
+
+Common::Input::NfcState VirtualAmiibo::SupportsNfc(
+    [[maybe_unused]] const PadIdentifier& identifier_) {
+    return Common::Input::NfcState::Success;
+}
+
+Common::Input::NfcState VirtualAmiibo::WriteNfcData(
+    [[maybe_unused]] const PadIdentifier& identifier_, const std::vector<u8>& data) {
+    const Common::FS::IOFile amiibo_file{file_path, Common::FS::FileAccessMode::ReadWrite,
+                                         Common::FS::FileType::BinaryFile};
+
+    if (!amiibo_file.IsOpen()) {
+        LOG_ERROR(Core, "Amiibo is already on use");
+        return Common::Input::NfcState::WriteFailed;
+    }
+
+    if (!amiibo_file.Write(data)) {
+        LOG_ERROR(Service_NFP, "Error writting to file");
+        return Common::Input::NfcState::WriteFailed;
+    }
+
+    return Common::Input::NfcState::Success;
+}
+
+VirtualAmiibo::State VirtualAmiibo::GetCurrentState() const {
+    return state;
+}
+
+VirtualAmiibo::Info VirtualAmiibo::LoadAmiibo(const std::string& filename) {
+    const Common::FS::IOFile amiibo_file{filename, Common::FS::FileAccessMode::Read,
+                                         Common::FS::FileType::BinaryFile};
+
+    if (state != State::WaitingForAmiibo) {
+        return Info::WrongDeviceState;
+    }
+
+    if (!amiibo_file.IsOpen()) {
+        return Info::UnableToLoad;
+    }
+
+    amiibo_data.resize(amiibo_size);
+
+    if (amiibo_file.Read(amiibo_data) < amiibo_size_without_password) {
+        return Info::NotAnAmiibo;
+    }
+
+    file_path = filename;
+    state = State::AmiiboIsOpen;
+    SetNfc(identifier, {Common::Input::NfcState::NewAmiibo, amiibo_data});
+    return Info::Success;
+}
+
+VirtualAmiibo::Info VirtualAmiibo::CloseAmiibo() {
+    state = polling_mode == Common::Input::PollingMode::NFC ? State::WaitingForAmiibo
+                                                            : State::Initialized;
+    SetNfc(identifier, {Common::Input::NfcState::AmiiboRemoved, {}});
+    return Info::Success;
+}
+
+} // namespace InputCommon
diff --git a/src/input_common/drivers/virtual_amiibo.h b/src/input_common/drivers/virtual_amiibo.h
new file mode 100644
index 000000000..5790e4a1f
--- /dev/null
+++ b/src/input_common/drivers/virtual_amiibo.h
@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+#include <string>
+#include <vector>
+
+#include "common/common_types.h"
+#include "input_common/input_engine.h"
+
+namespace Common::FS {
+class IOFile;
+}
+
+namespace InputCommon {
+
+class VirtualAmiibo final : public InputEngine {
+public:
+    enum class State {
+        Initialized,
+        WaitingForAmiibo,
+        AmiiboIsOpen,
+    };
+
+    enum class Info {
+        Success,
+        UnableToLoad,
+        NotAnAmiibo,
+        WrongDeviceState,
+        Unknown,
+    };
+
+    explicit VirtualAmiibo(std::string input_engine_);
+    ~VirtualAmiibo() override;
+
+    // Sets polling mode to a controller
+    Common::Input::PollingError SetPollingMode(
+        const PadIdentifier& identifier_, const Common::Input::PollingMode polling_mode_) override;
+
+    Common::Input::NfcState SupportsNfc(const PadIdentifier& identifier_) override;
+
+    Common::Input::NfcState WriteNfcData(const PadIdentifier& identifier_,
+                                         const std::vector<u8>& data) override;
+
+    State GetCurrentState() const;
+
+    Info LoadAmiibo(const std::string& amiibo_file);
+    Info CloseAmiibo();
+
+private:
+    static constexpr std::size_t amiibo_size = 0x21C;
+    static constexpr std::size_t amiibo_size_without_password = amiibo_size - 0x8;
+
+    std::string file_path{};
+    State state{State::Initialized};
+    std::vector<u8> amiibo_data;
+    Common::Input::PollingMode polling_mode{Common::Input::PollingMode::Pasive};
+};
+} // namespace InputCommon