hdmi: cec: move to subdir

hdmi/cec/Android.bp

@@ -0,0 +1,25 @@
+// Copyright (C) 2021 The Android Open Source Project
+// Copyright (C) 2025 KonstaKANG
+//
+// SPDX-License-Identifier: Apache-2.0
+
+cc_binary {
+    name: "android.hardware.tv.hdmi.cec-service.rpi",
+    relative_install_path: "hw",
+    init_rc: ["android.hardware.tv.hdmi.cec-service.rpi.rc"],
+    vintf_fragments: ["android.hardware.tv.hdmi.cec-service.rpi.xml"],
+    vendor: true,
+    srcs: [
+        "HdmiCec.cpp",
+        "HdmiCecPort.cpp",
+        "main.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.tv.hdmi.cec-V1-ndk",
+        "libbase",
+        "libbinder_ndk",
+        "libcutils",
+        "libhardware",
+        "liblog",
+    ],
+}

hdmi/cec/HdmiCec.cpp

@@ -0,0 +1,470 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ * Copyright (C) 2025 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.tv.hdmi.cec-service.rpi"
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+
+#include <cutils/properties.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/ioctl.h>
+#include <poll.h>
+
+#include "HdmiCec.h"
+
+#define PROPERTY_CEC_DEVICE "persist.vendor.hdmi.cec_device"
+
+using android::base::GetProperty;
+using ndk::ScopedAStatus;
+using std::string;
+
+namespace android {
+namespace hardware {
+namespace tv {
+namespace hdmi {
+namespace cec {
+namespace implementation {
+
+HdmiCec::HdmiCec() {
+    mCecEnabled = false;
+    mWakeupEnabled = false;
+    mCecControlEnabled = false;
+    mCallback = nullptr;
+
+    Result result = init();
+    if (result != Result::SUCCESS) {
+        LOG(ERROR) << "Failed to init HDMI-CEC HAL";
+    }
+}
+
+HdmiCec::~HdmiCec() {
+    release();
+}
+
+ScopedAStatus HdmiCec::addLogicalAddress(CecLogicalAddress addr, Result* _aidl_return) {
+    if (addr < CecLogicalAddress::TV || addr >= CecLogicalAddress::BROADCAST) {
+        LOG(ERROR) << "Add logical address failed, Invalid address";
+        *_aidl_return = Result::FAILURE_INVALID_ARGS;
+        return ScopedAStatus::ok();
+    }
+
+    cec_log_addrs cecLogAddrs;
+    int ret = ioctl(mHdmiCecPorts[0]->mCecFd, CEC_ADAP_G_LOG_ADDRS, &cecLogAddrs);
+    if (ret) {
+        LOG(ERROR) << "Add logical address failed, Error = " << strerror(errno);
+        *_aidl_return = Result::FAILURE_BUSY;
+        return ScopedAStatus::ok();
+    }
+
+    cecLogAddrs.cec_version = CEC_OP_CEC_VERSION_1_4;
+    cecLogAddrs.vendor_id = 0x000c03;  // HDMI LLC vendor ID
+
+    unsigned int logAddrType = CEC_LOG_ADDR_TYPE_UNREGISTERED;
+    unsigned int allDevTypes = 0;
+    unsigned int primDevType = 0xff;
+    switch (addr) {
+        case CecLogicalAddress::TV:
+            primDevType = CEC_OP_PRIM_DEVTYPE_TV;
+            logAddrType = CEC_LOG_ADDR_TYPE_TV;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_TV;
+            break;
+        case CecLogicalAddress::RECORDER_1:
+        case CecLogicalAddress::RECORDER_2:
+        case CecLogicalAddress::RECORDER_3:
+            primDevType = CEC_OP_PRIM_DEVTYPE_RECORD;
+            logAddrType = CEC_LOG_ADDR_TYPE_RECORD;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_RECORD;
+            break;
+        case CecLogicalAddress::TUNER_1:
+        case CecLogicalAddress::TUNER_2:
+        case CecLogicalAddress::TUNER_3:
+        case CecLogicalAddress::TUNER_4:
+            primDevType = CEC_OP_PRIM_DEVTYPE_TUNER;
+            logAddrType = CEC_LOG_ADDR_TYPE_TUNER;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_TUNER;
+            break;
+        case CecLogicalAddress::PLAYBACK_1:
+        case CecLogicalAddress::PLAYBACK_2:
+        case CecLogicalAddress::PLAYBACK_3:
+            primDevType = CEC_OP_PRIM_DEVTYPE_PLAYBACK;
+            logAddrType = CEC_LOG_ADDR_TYPE_PLAYBACK;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_PLAYBACK;
+            cecLogAddrs.flags |= CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU;
+            break;
+        case CecLogicalAddress::AUDIO_SYSTEM:
+            primDevType = CEC_OP_PRIM_DEVTYPE_AUDIOSYSTEM;
+            logAddrType = CEC_LOG_ADDR_TYPE_AUDIOSYSTEM;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_AUDIOSYSTEM;
+            break;
+        case CecLogicalAddress::FREE_USE:
+            primDevType = CEC_OP_PRIM_DEVTYPE_PROCESSOR;
+            logAddrType = CEC_LOG_ADDR_TYPE_SPECIFIC;
+            allDevTypes = CEC_OP_ALL_DEVTYPE_SWITCH;
+            break;
+        case CecLogicalAddress::UNREGISTERED:
+            cecLogAddrs.flags |= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK;
+            break;
+        case CecLogicalAddress::BACKUP_1:
+        case CecLogicalAddress::BACKUP_2:
+            break;
+    }
+
+    int logAddrIndex = cecLogAddrs.num_log_addrs;
+    cecLogAddrs.num_log_addrs += 1;
+    cecLogAddrs.log_addr[logAddrIndex] = static_cast<cec_logical_address_t>(addr);
+    cecLogAddrs.log_addr_type[logAddrIndex] = logAddrType;
+    cecLogAddrs.primary_device_type[logAddrIndex] = primDevType;
+    cecLogAddrs.all_device_types[logAddrIndex] = allDevTypes;
+    cecLogAddrs.features[logAddrIndex][0] = 0;
+    cecLogAddrs.features[logAddrIndex][1] = 0;
+
+    ret = ioctl(mHdmiCecPorts[0]->mCecFd, CEC_ADAP_S_LOG_ADDRS, &cecLogAddrs);
+    if (ret) {
+        LOG(ERROR) << "Add logical address failed for port " << mHdmiCecPorts[0]->mPortId
+                   << ", Error = " << strerror(errno);
+        *_aidl_return = Result::FAILURE_BUSY;
+        return ScopedAStatus::ok();
+    }
+
+    *_aidl_return = Result::SUCCESS;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::clearLogicalAddress() {
+    cec_log_addrs cecLogAddrs;
+    memset(&cecLogAddrs, 0, sizeof(cecLogAddrs));
+
+    int ret = ioctl(mHdmiCecPorts[0]->mCecFd, CEC_ADAP_S_LOG_ADDRS, &cecLogAddrs);
+    if (ret) {
+        LOG(ERROR) << "Clear logical Address failed for port " << mHdmiCecPorts[0]->mPortId
+                   << ", Error = " << strerror(errno);
+    }
+
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::enableAudioReturnChannel(int32_t portId __unused, bool enable __unused) {
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::getCecVersion(int32_t* _aidl_return) {
+    *_aidl_return = CEC_OP_CEC_VERSION_1_4;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::getPhysicalAddress(int32_t* _aidl_return) {
+    uint16_t addr;
+
+    int ret = ioctl(mHdmiCecPorts[0]->mCecFd, CEC_ADAP_G_PHYS_ADDR, &addr);
+    if (ret) {
+        LOG(ERROR) << "Get physical address failed, Error = " << strerror(errno);
+        return ScopedAStatus::fromServiceSpecificError(
+                static_cast<int32_t>(Result::FAILURE_INVALID_STATE));
+    }
+
+    *_aidl_return = addr;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::getVendorId(int32_t* _aidl_return) {
+    *_aidl_return = 0x000c03;  // HDMI LLC vendor ID
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::sendMessage(const CecMessage& message, SendMessageResult* _aidl_return) {
+    if (!mCecEnabled) {
+        *_aidl_return = SendMessageResult::FAIL;
+        return ScopedAStatus::ok();
+    }
+
+    cec_msg cecMsg;
+    memset(&cecMsg, 0, sizeof(cec_msg));
+
+    int initiator = static_cast<cec_logical_address_t>(message.initiator);
+    int destination = static_cast<cec_logical_address_t>(message.destination);
+
+    cecMsg.msg[0] = (initiator << 4) | destination;
+    for (size_t i = 0; i < message.body.size(); ++i) {
+        cecMsg.msg[i + 1] = message.body[i];
+    }
+    cecMsg.len = message.body.size() + 1;
+
+    int ret = ioctl(mHdmiCecPorts[0]->mCecFd, CEC_TRANSMIT, &cecMsg);
+    if (ret) {
+        LOG(ERROR) << "Send message failed, Error = " << strerror(errno);
+        *_aidl_return = SendMessageResult::FAIL;
+        return ScopedAStatus::ok();
+    }
+
+    if (cecMsg.tx_status != CEC_TX_STATUS_OK) {
+        LOG(ERROR) << "Send message tx_status = " << cecMsg.tx_status;
+    }
+
+    *_aidl_return = getSendMessageResult(cecMsg.tx_status);
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::setCallback(const std::shared_ptr<IHdmiCecCallback>& callback) {
+    if (mCallback != nullptr) {
+        mCallback = nullptr;
+    }
+
+    if (callback != nullptr) {
+        mCallback = callback;
+    }
+
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::setLanguage(const std::string& language __unused) {
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::enableWakeupByOtp(bool value) {
+    mWakeupEnabled = value;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::enableCec(bool value) {
+    mCecEnabled = value;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus HdmiCec::enableSystemCecControl(bool value) {
+    mCecControlEnabled = value;
+    return ScopedAStatus::ok();
+}
+
+// Initialise the cec file descriptor
+Result HdmiCec::init() {
+    string cecDevice = GetProperty(PROPERTY_CEC_DEVICE, "cec0");
+    if (cecDevice != "cec0" && cecDevice != "cec1") {
+        LOG(ERROR) << "Invalid CEC device " << cecDevice;
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+
+    string devicePath = "/dev/" + cecDevice;
+    int portId = stoi(cecDevice.substr(3));
+
+    shared_ptr<HdmiCecPort> hdmiCecPort(new HdmiCecPort(portId));
+    Result result = hdmiCecPort->init(devicePath.c_str());
+    if (result != Result::SUCCESS) {
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+
+    thread eventThread(&HdmiCec::event_thread, this, hdmiCecPort.get());
+    mEventThreads.push_back(std::move(eventThread));
+    mHdmiCecPorts.push_back(std::move(hdmiCecPort));
+    LOG(INFO) << "Using CEC device " << devicePath;
+
+    mCecEnabled = true;
+    mWakeupEnabled = true;
+    mCecControlEnabled = true;
+
+    return Result::SUCCESS;
+}
+
+void HdmiCec::release() {
+    mCecEnabled = false;
+    mWakeupEnabled = false;
+    mCecControlEnabled = false;
+
+    for (thread& eventThread : mEventThreads) {
+        if (eventThread.joinable()) {
+            eventThread.join();
+        }
+    }
+    setCallback(nullptr);
+    mHdmiCecPorts.clear();
+    mEventThreads.clear();
+}
+
+void HdmiCec::event_thread(HdmiCecPort* hdmiCecPort) {
+    struct pollfd ufds[3] = {
+            {hdmiCecPort->mCecFd, POLLIN, 0},
+            {hdmiCecPort->mCecFd, POLLERR, 0},
+            {hdmiCecPort->mExitFd, POLLIN, 0},
+    };
+
+    while (1) {
+        ufds[0].revents = 0;
+        ufds[1].revents = 0;
+        ufds[2].revents = 0;
+
+        int ret = poll(ufds, /* size(ufds) = */ 3, /* timeout = */ -1);
+
+        if (ret <= 0) {
+            continue;
+        }
+
+        if (ufds[2].revents == POLLIN) { /* Exit */
+            break;
+        }
+
+        if (ufds[1].revents == POLLERR) { /* CEC Event */
+            cec_event ev;
+            ret = ioctl(hdmiCecPort->mCecFd, CEC_DQEVENT, &ev);
+
+            if (ret) {
+                LOG(ERROR) << "CEC_DQEVENT failed, Error = " << strerror(errno);
+                continue;
+            }
+
+            if (!mCecEnabled) {
+                continue;
+            }
+
+/*
+            if (ev.event == CEC_EVENT_STATE_CHANGE) {
+                if (mCallback != nullptr) {
+                    HotplugEvent hotplugEvent{
+                            .connected = (ev.state_change.phys_addr != CEC_PHYS_ADDR_INVALID),
+                            .portId = hdmiCecPort->mPortId};
+                    mCallback->onHotplugEvent(hotplugEvent);
+                } else {
+                    LOG(ERROR) << "No event callback for hotplug";
+                }
+            }
+*/
+        }
+
+        if (ufds[0].revents == POLLIN) { /* CEC Driver */
+            cec_msg msg = {};
+            ret = ioctl(hdmiCecPort->mCecFd, CEC_RECEIVE, &msg);
+
+            if (ret) {
+                LOG(ERROR) << "CEC_RECEIVE failed, Error = " << strerror(errno);
+                continue;
+            }
+
+            if (msg.rx_status != CEC_RX_STATUS_OK) {
+                LOG(ERROR) << "msg rx_status = " << msg.rx_status;
+                continue;
+            }
+
+            if (!mCecEnabled) {
+                continue;
+            }
+
+            if (!mWakeupEnabled && isWakeupMessage(msg)) {
+                LOG(DEBUG) << "Filter wakeup message";
+                continue;
+            }
+
+            if (!mCecControlEnabled && !isTransferableInSleep(msg)) {
+                LOG(DEBUG) << "Filter message in standby mode";
+                continue;
+            }
+
+            if (mCallback != nullptr) {
+                size_t length = std::min(msg.len - 1, (uint32_t)(CEC_MESSAGE_BODY_MAX_LENGTH - 1));
+                CecMessage cecMessage{
+                        .initiator = static_cast<CecLogicalAddress>(msg.msg[0] >> 4),
+                        .destination = static_cast<CecLogicalAddress>(msg.msg[0] & 0xf),
+                };
+                cecMessage.body.resize(length);
+                for (size_t i = 0; i < length; ++i) {
+                    cecMessage.body[i] = static_cast<uint8_t>(msg.msg[i + 1]);
+                }
+                mCallback->onCecMessage(cecMessage);
+            } else {
+                LOG(ERROR) << "no event callback for message";
+            }
+        }
+    }
+}
+
+int HdmiCec::getOpcode(cec_msg message) {
+    return static_cast<uint8_t>(message.msg[1]);
+}
+
+bool HdmiCec::isWakeupMessage(cec_msg message) {
+    int opcode = getOpcode(message);
+    switch (opcode) {
+        case CEC_MESSAGE_TEXT_VIEW_ON:
+        case CEC_MESSAGE_IMAGE_VIEW_ON:
+            return true;
+        default:
+            return false;
+    }
+}
+
+bool HdmiCec::isTransferableInSleep(cec_msg message) {
+    int opcode = getOpcode(message);
+    switch (opcode) {
+        case CEC_MESSAGE_ABORT:
+        case CEC_MESSAGE_DEVICE_VENDOR_ID:
+        case CEC_MESSAGE_GET_CEC_VERSION:
+        case CEC_MESSAGE_GET_MENU_LANGUAGE:
+        case CEC_MESSAGE_GIVE_DEVICE_POWER_STATUS:
+        case CEC_MESSAGE_GIVE_DEVICE_VENDOR_ID:
+        case CEC_MESSAGE_GIVE_OSD_NAME:
+        case CEC_MESSAGE_GIVE_PHYSICAL_ADDRESS:
+        case CEC_MESSAGE_REPORT_PHYSICAL_ADDRESS:
+        case CEC_MESSAGE_REPORT_POWER_STATUS:
+        case CEC_MESSAGE_SET_OSD_NAME:
+        case CEC_MESSAGE_DECK_CONTROL:
+        case CEC_MESSAGE_PLAY:
+        case CEC_MESSAGE_IMAGE_VIEW_ON:
+        case CEC_MESSAGE_TEXT_VIEW_ON:
+        case CEC_MESSAGE_SYSTEM_AUDIO_MODE_REQUEST:
+            return true;
+        case CEC_MESSAGE_USER_CONTROL_PRESSED:
+            return isPowerUICommand(message);
+        default:
+            return false;
+    }
+}
+
+int HdmiCec::getFirstParam(cec_msg message) {
+    return static_cast<uint8_t>(message.msg[2]);
+}
+
+bool HdmiCec::isPowerUICommand(cec_msg message) {
+    int uiCommand = getFirstParam(message);
+    switch (uiCommand) {
+        case CEC_OP_UI_CMD_POWER:
+        case CEC_OP_UI_CMD_DEVICE_ROOT_MENU:
+        case CEC_OP_UI_CMD_POWER_ON_FUNCTION:
+            return true;
+        default:
+            return false;
+    }
+}
+
+SendMessageResult HdmiCec::getSendMessageResult(int tx_status) {
+    switch (tx_status) {
+        case CEC_TX_STATUS_OK:
+            return SendMessageResult::SUCCESS;
+        case CEC_TX_STATUS_ARB_LOST:
+            return SendMessageResult::BUSY;
+        case CEC_TX_STATUS_NACK:
+            return SendMessageResult::NACK;
+        default:
+            return SendMessageResult::FAIL;
+    }
+}
+
+}  // namespace implementation
+}  // namespace cec
+}  // namespace hdmi
+}  // namespace tv
+}  // namespace hardware
+}  // namespace android

hdmi/cec/HdmiCec.h

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ * Copyright (C) 2025 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <aidl/android/hardware/tv/hdmi/cec/BnHdmiCec.h>
+#include <hardware/hdmi_cec.h>
+#include <linux/cec.h>
+#include <thread>
+#include <vector>
+#include "HdmiCecPort.h"
+
+namespace android {
+namespace hardware {
+namespace tv {
+namespace hdmi {
+namespace cec {
+namespace implementation {
+
+using std::shared_ptr;
+using std::thread;
+using std::vector;
+
+using ::aidl::android::hardware::tv::hdmi::cec::BnHdmiCec;
+using ::aidl::android::hardware::tv::hdmi::cec::CecLogicalAddress;
+using ::aidl::android::hardware::tv::hdmi::cec::CecMessage;
+using ::aidl::android::hardware::tv::hdmi::cec::IHdmiCec;
+using ::aidl::android::hardware::tv::hdmi::cec::IHdmiCecCallback;
+using ::aidl::android::hardware::tv::hdmi::cec::Result;
+using ::aidl::android::hardware::tv::hdmi::cec::SendMessageResult;
+
+struct HdmiCec : public BnHdmiCec {
+  public:
+    HdmiCec();
+    ~HdmiCec();
+    ::ndk::ScopedAStatus addLogicalAddress(CecLogicalAddress addr, Result* _aidl_return) override;
+    ::ndk::ScopedAStatus clearLogicalAddress() override;
+    ::ndk::ScopedAStatus enableAudioReturnChannel(int32_t portId, bool enable) override;
+    ::ndk::ScopedAStatus getCecVersion(int32_t* _aidl_return) override;
+    ::ndk::ScopedAStatus getPhysicalAddress(int32_t* _aidl_return) override;
+    ::ndk::ScopedAStatus getVendorId(int32_t* _aidl_return) override;
+    ::ndk::ScopedAStatus sendMessage(const CecMessage& message,
+                                     SendMessageResult* _aidl_return) override;
+    ::ndk::ScopedAStatus setCallback(const std::shared_ptr<IHdmiCecCallback>& callback) override;
+    ::ndk::ScopedAStatus setLanguage(const std::string& language) override;
+    ::ndk::ScopedAStatus enableWakeupByOtp(bool value) override;
+    ::ndk::ScopedAStatus enableCec(bool value) override;
+    ::ndk::ScopedAStatus enableSystemCecControl(bool value) override;
+
+    Result init();
+    void release();
+
+  private:
+    void event_thread(HdmiCecPort* hdmiCecPort);
+    static int getOpcode(cec_msg message);
+    static int getFirstParam(cec_msg message);
+    static bool isWakeupMessage(cec_msg message);
+    static bool isTransferableInSleep(cec_msg message);
+    static bool isPowerUICommand(cec_msg message);
+    static SendMessageResult getSendMessageResult(int tx_status);
+
+    vector<thread> mEventThreads;
+    vector<shared_ptr<HdmiCecPort>> mHdmiCecPorts;
+
+    // When set to false, all the CEC commands are discarded. True by default after initialization.
+    bool mCecEnabled;
+    /*
+     * When set to false, HAL does not wake up the system upon receiving <Image View On> or
+     * <Text View On>. True by default after initialization.
+     */
+    bool mWakeupEnabled;
+    /*
+     * Updated when system goes into or comes out of standby mode.
+     * When set to true, Android system is handling CEC commands.
+     * When set to false, microprocessor is handling CEC commands.
+     * True by default after initialization.
+     */
+    bool mCecControlEnabled;
+
+    std::shared_ptr<IHdmiCecCallback> mCallback;
+};
+
+}  // namespace implementation
+}  // namespace cec
+}  // namespace hdmi
+}  // namespace tv
+}  // namespace hardware
+}  // namespace android

hdmi/cec/HdmiCecPort.cpp

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ * Copyright (C) 2025 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.tv.hdmi.cec-service.rpi"
+
+#include <android-base/logging.h>
+#include <errno.h>
+#include <linux/cec.h>
+#include <linux/ioctl.h>
+#include <sys/eventfd.h>
+#include <algorithm>
+
+#include "HdmiCecPort.h"
+
+namespace android {
+namespace hardware {
+namespace tv {
+namespace hdmi {
+namespace cec {
+namespace implementation {
+
+HdmiCecPort::HdmiCecPort(unsigned int portId) {
+    mPortId = portId;
+    mCecFd = -1;
+    mExitFd = -1;
+}
+
+HdmiCecPort::~HdmiCecPort() {
+    release();
+}
+
+// Initialise the cec file descriptor
+Result HdmiCecPort::init(const char* path) {
+    mCecFd = open(path, O_RDWR);
+    if (mCecFd < 0) {
+        LOG(ERROR) << "Failed to open " << path << ", Error = " << strerror(errno);
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+    mExitFd = eventfd(0, EFD_NONBLOCK);
+    if (mExitFd < 0) {
+        LOG(ERROR) << "Failed to open eventfd, Error = " << strerror(errno);
+        release();
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+
+    // Ensure the CEC device supports required capabilities
+    struct cec_caps caps = {};
+    int ret = ioctl(mCecFd, CEC_ADAP_G_CAPS, &caps);
+    if (ret) {
+        LOG(ERROR) << "Unable to query cec adapter capabilities, Error = " << strerror(errno);
+        release();
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+
+    if (!(caps.capabilities & (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | CEC_CAP_PASSTHROUGH))) {
+        LOG(ERROR) << "Wrong cec adapter capabilities " << caps.capabilities;
+        release();
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+
+    uint32_t mode = CEC_MODE_INITIATOR | CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
+    ret = ioctl(mCecFd, CEC_S_MODE, &mode);
+    if (ret) {
+        LOG(ERROR) << "Unable to set initiator mode, Error = " << strerror(errno);
+        release();
+        return Result::FAILURE_NOT_SUPPORTED;
+    }
+    return Result::SUCCESS;
+}
+
+void HdmiCecPort::release() {
+    if (mExitFd > 0) {
+        uint64_t tmp = 1;
+        write(mExitFd, &tmp, sizeof(tmp));
+    }
+    if (mExitFd > 0) {
+        close(mExitFd);
+    }
+    if (mCecFd > 0) {
+        close(mCecFd);
+    }
+}
+
+}  // namespace implementation
+}  // namespace cec
+}  // namespace hdmi
+}  // namespace tv
+}  // namespace hardware
+}  // namespace android

hdmi/cec/HdmiCecPort.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ * Copyright (C) 2025 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <aidl/android/hardware/tv/hdmi/cec/BnHdmiCec.h>
+
+namespace android {
+namespace hardware {
+namespace tv {
+namespace hdmi {
+namespace cec {
+namespace implementation {
+
+using ::aidl::android::hardware::tv::hdmi::cec::Result;
+
+class HdmiCecPort {
+  public:
+    HdmiCecPort(unsigned int portId);
+    ~HdmiCecPort();
+    Result init(const char* path);
+    void release();
+
+    unsigned int mPortId;
+    int mCecFd;
+    int mExitFd;
+};
+
+}  // namespace implementation
+}  // namespace cec
+}  // namespace hdmi
+}  // namespace tv
+}  // namespace hardware
+}  // namespace android

hdmi/cec/android.hardware.tv.hdmi.cec-service.rpi.rc

@@ -0,0 +1,5 @@
+service vendor.cec-default /vendor/bin/hw/android.hardware.tv.hdmi.cec-service.rpi
+    interface aidl android.hardware.tv.hdmi.cec.IHdmiCec/default
+    class hal
+    user system
+    group system

hdmi/cec/android.hardware.tv.hdmi.cec-service.rpi.xml

@@ -0,0 +1,10 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.tv.hdmi.cec</name>
+        <version>1</version>
+        <interface>
+            <name>IHdmiCec</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>

hdmi/cec/main.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ * Copyright (C) 2025 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "HdmiCec.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using android::hardware::tv::hdmi::cec::implementation::HdmiCec;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(1);
+    ABinderProcess_startThreadPool();
+
+    std::shared_ptr<HdmiCec> hdmiCecAidl = ndk::SharedRefBase::make<HdmiCec>();
+    const std::string instance = std::string() + HdmiCec::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(hdmiCecAidl->asBinder().get(), instance.c_str());
+    CHECK_EQ(status, STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reach
+}