server/hdmi/HdmiControlService.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.
 */

package com.android.server.hdmi;

import static android.hardware.hdmi.HdmiControlManager.DEVICE_EVENT_ADD_DEVICE;
import static android.hardware.hdmi.HdmiControlManager.DEVICE_EVENT_REMOVE_DEVICE;
import static com.android.server.hdmi.Constants.DISABLED;
import static com.android.server.hdmi.Constants.ENABLED;
import static com.android.server.hdmi.Constants.OPTION_CEC_AUTO_WAKEUP;
import static com.android.server.hdmi.Constants.OPTION_CEC_ENABLE;
import static com.android.server.hdmi.Constants.OPTION_CEC_SERVICE_CONTROL;
import static com.android.server.hdmi.Constants.OPTION_MHL_ENABLE;
import static com.android.server.hdmi.Constants.OPTION_MHL_INPUT_SWITCHING;
import static com.android.server.hdmi.Constants.OPTION_MHL_POWER_CHARGE;

import android.annotation.Nullable;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.ContentObserver;
import android.hardware.hdmi.HdmiControlManager;
import android.hardware.hdmi.HdmiDeviceInfo;
import android.hardware.hdmi.HdmiHotplugEvent;
import android.hardware.hdmi.HdmiPortInfo;
import android.hardware.hdmi.IHdmiControlCallback;
import android.hardware.hdmi.IHdmiControlService;
import android.hardware.hdmi.IHdmiDeviceEventListener;
import android.hardware.hdmi.IHdmiHotplugEventListener;
import android.hardware.hdmi.IHdmiInputChangeListener;
import android.hardware.hdmi.IHdmiMhlScratchpadCommandListener;
import android.hardware.hdmi.IHdmiRecordListener;
import android.hardware.hdmi.IHdmiSystemAudioModeChangeListener;
import android.hardware.hdmi.IHdmiVendorCommandListener;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.provider.Settings.Global;
import android.text.TextUtils;
import android.util.ArraySet;
import android.util.Slog;
import android.util.SparseArray;
import android.util.SparseIntArray;

import com.android.internal.annotations.GuardedBy;
import com.android.server.SystemService;
import com.android.server.hdmi.HdmiAnnotations.ServiceThreadOnly;
import com.android.server.hdmi.HdmiCecController.AllocateAddressCallback;
import com.android.server.hdmi.HdmiCecLocalDevice.ActiveSource;
import com.android.server.hdmi.HdmiCecLocalDevice.PendingActionClearedCallback;

import libcore.util.EmptyArray;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

/**
 * Provides a service for sending and processing HDMI control messages,
 * HDMI-CEC and MHL control command, and providing the information on both standard.
 */
public final class HdmiControlService extends SystemService {
    private static final String TAG = "HdmiControlService";

    static final String PERMISSION = "android.permission.HDMI_CEC";

    // The reason code to initiate intializeCec().
    static final int INITIATED_BY_ENABLE_CEC = 0;
    static final int INITIATED_BY_BOOT_UP = 1;
    static final int INITIATED_BY_SCREEN_ON = 2;
    static final int INITIATED_BY_WAKE_UP_MESSAGE = 3;

    /**
     * Interface to report send result.
     */
    interface SendMessageCallback {
        /**
         * Called when {@link HdmiControlService#sendCecCommand} is completed.
         *
         * @param error result of send request.
         * <ul>
         * <li>{@link Constants#SEND_RESULT_SUCCESS}
         * <li>{@link Constants#SEND_RESULT_NAK}
         * <li>{@link Constants#SEND_RESULT_FAILURE}
         * </ul>
         */
        void onSendCompleted(int error);
    }

    /**
     * Interface to get a list of available logical devices.
     */
    interface DevicePollingCallback {
        /**
         * Called when device polling is finished.
         *
         * @param ackedAddress a list of logical addresses of available devices
         */
        void onPollingFinished(List<Integer> ackedAddress);
    }

    private class HdmiControlBroadcastReceiver extends BroadcastReceiver {
        @ServiceThreadOnly
        @Override
        public void onReceive(Context context, Intent intent) {
            assertRunOnServiceThread();
            switch (intent.getAction()) {
                case Intent.ACTION_SCREEN_OFF:
                    if (isPowerOnOrTransient()) {
                        onStandby();
                    }
                    break;
                case Intent.ACTION_SCREEN_ON:
                    if (isPowerStandbyOrTransient()) {
                        onWakeUp();
                    }
                    break;
                case Intent.ACTION_CONFIGURATION_CHANGED:
                    String language = Locale.getDefault().getISO3Language();
                    if (!mLanguage.equals(language)) {
                        onLanguageChanged(language);
                    }
                    break;
            }
        }
    }

    // A thread to handle synchronous IO of CEC and MHL control service.
    // Since all of CEC and MHL HAL interfaces processed in short time (< 200ms)
    // and sparse call it shares a thread to handle IO operations.
    private final HandlerThread mIoThread = new HandlerThread("Hdmi Control Io Thread");

    // Used to synchronize the access to the service.
    private final Object mLock = new Object();

    // Type of logical devices hosted in the system. Stored in the unmodifiable list.
    private final List<Integer> mLocalDevices;

    private final HdmiLogger mSpamSafeLogger = new HdmiLogger(TAG);

    // List of records for hotplug event listener to handle the the caller killed in action.
    @GuardedBy("mLock")
    private final ArrayList<HotplugEventListenerRecord> mHotplugEventListenerRecords =
            new ArrayList<>();

    // List of records for device event listener to handle the caller killed in action.
    @GuardedBy("mLock")
    private final ArrayList<DeviceEventListenerRecord> mDeviceEventListenerRecords =
            new ArrayList<>();

    // List of records for vendor command listener to handle the caller killed in action.
    @GuardedBy("mLock")
    private final ArrayList<VendorCommandListenerRecord> mVendorCommandListenerRecords =
            new ArrayList<>();

    // List of records for MHL Scratchpad command listener to handle the caller killed in action.
    @GuardedBy("mLock")
    private final ArrayList<HdmiMhlScratchpadCommandListenerRecord>
            mScratchpadCommandListenerRecords = new ArrayList<>();

    @GuardedBy("mLock")
    private InputChangeListenerRecord mInputChangeListenerRecord;

    @GuardedBy("mLock")
    private HdmiRecordListenerRecord mRecordListenerRecord;

    // Set to true while HDMI control is enabled. If set to false, HDMI-CEC/MHL protocol
    // handling will be disabled and no request will be handled.
    @GuardedBy("mLock")
    private boolean mHdmiControlEnabled;

    // Set to true while the service is in normal mode. While set to false, no input change is
    // allowed. Used for situations where input change can confuse users such as channel auto-scan,
    // system upgrade, etc., a.k.a. "prohibit mode".
    @GuardedBy("mLock")
    private boolean mProhibitMode;

    // Set to true while the input change by MHL is allowed.
    @GuardedBy("mLock")
    private boolean mMhlInputChangeEnabled;

    @GuardedBy("mLock")
    private List<HdmiDeviceInfo> mMhlDevices;

    // List of records for system audio mode change to handle the the caller killed in action.
    private final ArrayList<SystemAudioModeChangeListenerRecord>
            mSystemAudioModeChangeListenerRecords = new ArrayList<>();

    // Handler used to run a task in service thread.
    private final Handler mHandler = new Handler();

    private final SettingsObserver mSettingsObserver;

    private final HdmiControlBroadcastReceiver
            mHdmiControlBroadcastReceiver = new HdmiControlBroadcastReceiver();

    @Nullable
    private HdmiCecController mCecController;

    @Nullable
    private HdmiMhlController mMhlController;

    // HDMI port information. Stored in the unmodifiable list to keep the static information
    // from being modified.
    private List<HdmiPortInfo> mPortInfo;

    // Map from path(physical address) to port ID.
    private UnmodifiableSparseIntArray mPortIdMap;

    // Map from port ID to HdmiPortInfo.
    private UnmodifiableSparseArray<HdmiPortInfo> mPortInfoMap;

    // Map from port ID to HdmiDeviceInfo.
    private UnmodifiableSparseArray<HdmiDeviceInfo> mPortDeviceMap;

    private HdmiCecMessageValidator mMessageValidator;

    @ServiceThreadOnly
    private int mPowerStatus = HdmiControlManager.POWER_STATUS_STANDBY;

    @ServiceThreadOnly
    private String mLanguage = Locale.getDefault().getISO3Language();

    @ServiceThreadOnly
    private boolean mStandbyMessageReceived = false;

    @ServiceThreadOnly
    private boolean mWakeUpMessageReceived = false;

    @ServiceThreadOnly
    private int mActivePortId = Constants.INVALID_PORT_ID;

    // Last input port before switching to the MHL port by way of incoming request RAP[ContentOn].
    // Should switch back to this port when the device sends RAP[ContentOff].
    // Gets invalidated if we go to other port/input.
    @ServiceThreadOnly
    private int mLastInputMhl = Constants.INVALID_PORT_ID;

    public HdmiControlService(Context context) {
        super(context);
        mLocalDevices = getIntList(SystemProperties.get(Constants.PROPERTY_DEVICE_TYPE));
        mSettingsObserver = new SettingsObserver(mHandler);
    }

    private static List<Integer> getIntList(String string) {
        ArrayList<Integer> list = new ArrayList<>();
        TextUtils.SimpleStringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
        splitter.setString(string);
        for (String item : splitter) {
            try {
                list.add(Integer.parseInt(item));
            } catch (NumberFormatException e) {
                Slog.w(TAG, "Can't parseInt: " + item);
            }
        }
        return Collections.unmodifiableList(list);
    }

    @Override
    public void onStart() {
        mIoThread.start();
        mPowerStatus = HdmiControlManager.POWER_STATUS_TRANSIENT_TO_ON;
        mProhibitMode = false;
        mHdmiControlEnabled = readBooleanSetting(Global.HDMI_CONTROL_ENABLED, true);
        mMhlInputChangeEnabled = readBooleanSetting(Global.MHL_INPUT_SWITCHING_ENABLED, true);

        mCecController = HdmiCecController.create(this);
        if (mCecController != null) {
            // TODO: Remove this as soon as OEM's HAL implementation is corrected.
            mCecController.setOption(OPTION_CEC_ENABLE, ENABLED);

            // TODO: load value for mHdmiControlEnabled from preference.
            if (mHdmiControlEnabled) {
                initializeCec(INITIATED_BY_BOOT_UP);
            }
        } else {
            Slog.i(TAG, "Device does not support HDMI-CEC.");
        }

        mMhlController = HdmiMhlController.create(this);
        if (mMhlController == null) {
            Slog.i(TAG, "Device does not support MHL-control.");
        }
        initPortInfo();
        mMhlDevices = Collections.emptyList();
        mMessageValidator = new HdmiCecMessageValidator(this);
        publishBinderService(Context.HDMI_CONTROL_SERVICE, new BinderService());

        // Register broadcast receiver for power state change.
        if (mCecController != null || mMhlController != null) {
            IntentFilter filter = new IntentFilter();
            filter.addAction(Intent.ACTION_SCREEN_OFF);
            filter.addAction(Intent.ACTION_SCREEN_ON);
            filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
            getContext().registerReceiver(mHdmiControlBroadcastReceiver, filter);
        }
    }

    /**
     * Called when the initialization of local devices is complete.
     */
    private void onInitializeCecComplete() {
        if (mPowerStatus == HdmiControlManager.POWER_STATUS_TRANSIENT_TO_ON) {
            mPowerStatus = HdmiControlManager.POWER_STATUS_ON;
        }
        mWakeUpMessageReceived = false;

        if (isTvDevice()) {
            mCecController.setOption(OPTION_CEC_AUTO_WAKEUP, toInt(tv().getAutoWakeup()));
            registerContentObserver();
        }
    }

    private void registerContentObserver() {
        ContentResolver resolver = getContext().getContentResolver();
        String[] settings = new String[] {
                Global.HDMI_CONTROL_ENABLED,
                Global.HDMI_CONTROL_AUTO_WAKEUP_ENABLED,
                Global.HDMI_CONTROL_AUTO_DEVICE_OFF_ENABLED,
                Global.MHL_INPUT_SWITCHING_ENABLED,
                Global.MHL_POWER_CHARGE_ENABLED
        };
        for (String s : settings) {
            resolver.registerContentObserver(Global.getUriFor(s), false, mSettingsObserver,
                    UserHandle.USER_ALL);
        }
    }

    private class SettingsObserver extends ContentObserver {
        public SettingsObserver(Handler handler) {
            super(handler);
        }

        // onChange is set up to run in service thread.
        @Override
        public void onChange(boolean selfChange, Uri uri) {
            String option = uri.getLastPathSegment();
            boolean enabled = readBooleanSetting(option, true);
            switch (option) {
                case Global.HDMI_CONTROL_ENABLED:
                    setControlEnabled(enabled);
                    break;
                case Global.HDMI_CONTROL_AUTO_WAKEUP_ENABLED:
                    tv().setAutoWakeup(enabled);
                    setCecOption(OPTION_CEC_AUTO_WAKEUP, toInt(enabled));
                    break;
                case Global.HDMI_CONTROL_AUTO_DEVICE_OFF_ENABLED:
                    tv().setAutoDeviceOff(enabled);
                    // No need to propagate to HAL.
                    break;
                case Global.MHL_INPUT_SWITCHING_ENABLED:
                    setMhlInputChangeEnabled(enabled);
                    break;
                case Global.MHL_POWER_CHARGE_ENABLED:
                    if (mMhlController != null) {
                        mMhlController.setOption(OPTION_MHL_POWER_CHARGE, toInt(enabled));
                    }
                    break;
            }
        }
    }

    private static int toInt(boolean enabled) {
        return enabled ? ENABLED : DISABLED;
    }

    boolean readBooleanSetting(String key, boolean defVal) {
        ContentResolver cr = getContext().getContentResolver();
        return Global.getInt(cr, key, toInt(defVal)) == ENABLED;
    }

    void writeBooleanSetting(String key, boolean value) {
        ContentResolver cr = getContext().getContentResolver();
        Global.putInt(cr, key, toInt(value));
    }

    private void unregisterSettingsObserver() {
        getContext().getContentResolver().unregisterContentObserver(mSettingsObserver);
    }

    private void initializeCec(int initiatedBy) {
        mCecController.setOption(OPTION_CEC_SERVICE_CONTROL, ENABLED);
        initializeLocalDevices(mLocalDevices, initiatedBy);
    }

    @ServiceThreadOnly
    private void initializeLocalDevices(final List<Integer> deviceTypes, final int initiatedBy) {
        assertRunOnServiceThread();
        // A container for [Logical Address, Local device info].
        final SparseArray<HdmiCecLocalDevice> devices = new SparseArray<>();
        final int[] finished = new int[1];
        clearLocalDevices();
        for (int type : deviceTypes) {
            final HdmiCecLocalDevice localDevice = HdmiCecLocalDevice.create(this, type);
            localDevice.init();
            mCecController.allocateLogicalAddress(type,
                    localDevice.getPreferredAddress(), new AllocateAddressCallback() {
                @Override
                public void onAllocated(int deviceType, int logicalAddress) {
                    if (logicalAddress == Constants.ADDR_UNREGISTERED) {
                        Slog.e(TAG, "Failed to allocate address:[device_type:" + deviceType + "]");
                    } else {
                        // Set POWER_STATUS_ON to all local devices because they share lifetime
                        // with system.
                        HdmiDeviceInfo deviceInfo = createDeviceInfo(logicalAddress, deviceType,
                                HdmiControlManager.POWER_STATUS_ON);
                        localDevice.setDeviceInfo(deviceInfo);
                        mCecController.addLocalDevice(deviceType, localDevice);
                        mCecController.addLogicalAddress(logicalAddress);
                        devices.append(logicalAddress, localDevice);
                    }

                    // Address allocation completed for all devices. Notify each device.
                    if (deviceTypes.size() == ++finished[0]) {
                        onInitializeCecComplete();
                        notifyAddressAllocated(devices, initiatedBy);
                    }
                }
            });
        }
    }

    @ServiceThreadOnly
    private void notifyAddressAllocated(SparseArray<HdmiCecLocalDevice> devices, int initiatedBy) {
        assertRunOnServiceThread();
        for (int i = 0; i < devices.size(); ++i) {
            int address = devices.keyAt(i);
            HdmiCecLocalDevice device = devices.valueAt(i);
            device.handleAddressAllocated(address, initiatedBy);
        }
    }

    // Initialize HDMI port information. Combine the information from CEC and MHL HAL and
    // keep them in one place.
    @ServiceThreadOnly
    private void initPortInfo() {
        assertRunOnServiceThread();
        HdmiPortInfo[] cecPortInfo = null;

        // CEC HAL provides majority of the info while MHL does only MHL support flag for
        // each port. Return empty array if CEC HAL didn't provide the info.
        if (mCecController != null) {
            cecPortInfo = mCecController.getPortInfos();
        }
        if (cecPortInfo == null) {
            return;
        }

        SparseArray<HdmiPortInfo> portInfoMap = new SparseArray<>();
        SparseIntArray portIdMap = new SparseIntArray();
        SparseArray<HdmiDeviceInfo> portDeviceMap = new SparseArray<>();
        for (HdmiPortInfo info : cecPortInfo) {
            portIdMap.put(info.getAddress(), info.getId());
            portInfoMap.put(info.getId(), info);
            portDeviceMap.put(info.getId(), new HdmiDeviceInfo(info.getAddress(), info.getId()));
        }
        mPortIdMap = new UnmodifiableSparseIntArray(portIdMap);
        mPortInfoMap = new UnmodifiableSparseArray<>(portInfoMap);
        mPortDeviceMap = new UnmodifiableSparseArray<>(portDeviceMap);

        if (mMhlController == null) {
            mPortInfo = Collections.unmodifiableList(Arrays.asList(cecPortInfo));
            return;
        } else {
            HdmiPortInfo[] mhlPortInfo = mMhlController.getPortInfos();
            ArraySet<Integer> mhlSupportedPorts = new ArraySet<Integer>(mhlPortInfo.length);
            for (HdmiPortInfo info : mhlPortInfo) {
                if (info.isMhlSupported()) {
                    mhlSupportedPorts.add(info.getId());
                }
            }

            // Build HDMI port info list with CEC port info plus MHL supported flag.
            ArrayList<HdmiPortInfo> result = new ArrayList<>(cecPortInfo.length);
            for (HdmiPortInfo info : cecPortInfo) {
                if (mhlSupportedPorts.contains(info.getId())) {
                    result.add(new HdmiPortInfo(info.getId(), info.getType(), info.getAddress(),
                            info.isCecSupported(), true, info.isArcSupported()));
                } else {
                    result.add(info);
                }
            }
            mPortInfo = Collections.unmodifiableList(result);
        }
    }

    List<HdmiPortInfo> getPortInfo() {
        return mPortInfo;
    }

    /**
     * Returns HDMI port information for the given port id.
     *
     * @param portId HDMI port id
     * @return {@link HdmiPortInfo} for the given port
     */
    HdmiPortInfo getPortInfo(int portId) {
        return mPortInfoMap.get(portId, null);
    }

    /**
     * Returns the routing path (physical address) of the HDMI port for the given
     * port id.
     */
    int portIdToPath(int portId) {
        HdmiPortInfo portInfo = getPortInfo(portId);
        if (portInfo == null) {
            Slog.e(TAG, "Cannot find the port info: " + portId);
            return Constants.INVALID_PHYSICAL_ADDRESS;
        }
        return portInfo.getAddress();
    }

    /**
     * Returns the id of HDMI port located at the top of the hierarchy of
     * the specified routing path. For the routing path 0x1220 (1.2.2.0), for instance,
     * the port id to be returned is the ID associated with the port address
     * 0x1000 (1.0.0.0) which is the topmost path of the given routing path.
     */
    int pathToPortId(int path) {
        int portAddress = path & Constants.ROUTING_PATH_TOP_MASK;
        return mPortIdMap.get(portAddress, Constants.INVALID_PORT_ID);
    }

    boolean isValidPortId(int portId) {
        return getPortInfo(portId) != null;
    }

    /**
     * Returns {@link Looper} for IO operation.
     *
     * <p>Declared as package-private.
     */
    Looper getIoLooper() {
        return mIoThread.getLooper();
    }

    /**
     * Returns {@link Looper} of main thread. Use this {@link Looper} instance
     * for tasks that are running on main service thread.
     *
     * <p>Declared as package-private.
     */
    Looper getServiceLooper() {
        return mHandler.getLooper();
    }

    /**
     * Returns physical address of the device.
     */
    int getPhysicalAddress() {
        return mCecController.getPhysicalAddress();
    }

    /**
     * Returns vendor id of CEC service.
     */
    int getVendorId() {
        return mCecController.getVendorId();
    }

    @ServiceThreadOnly
    HdmiDeviceInfo getDeviceInfo(int logicalAddress) {
        assertRunOnServiceThread();
        HdmiCecLocalDeviceTv tv = tv();
        if (tv == null) {
            return null;
        }
        return tv.getCecDeviceInfo(logicalAddress);
    }

    /**
     * Returns version of CEC.
     */
    int getCecVersion() {
        return mCecController.getVersion();
    }

    /**
     * Whether a device of the specified physical address is connected to ARC enabled port.
     */
    boolean isConnectedToArcPort(int physicalAddress) {
        int portId = pathToPortId(physicalAddress);
        if (portId != Constants.INVALID_PORT_ID) {
            return mPortInfoMap.get(portId).isArcSupported();
        }
        return false;
    }

    void runOnServiceThread(Runnable runnable) {
        mHandler.post(runnable);
    }

    void runOnServiceThreadAtFrontOfQueue(Runnable runnable) {
        mHandler.postAtFrontOfQueue(runnable);
    }

    private void assertRunOnServiceThread() {
        if (Looper.myLooper() != mHandler.getLooper()) {
            throw new IllegalStateException("Should run on service thread.");
        }
    }

    /**
     * Transmit a CEC command to CEC bus.
     *
     * @param command CEC command to send out
     * @param callback interface used to the result of send command
     */
    @ServiceThreadOnly
    void sendCecCommand(HdmiCecMessage command, @Nullable SendMessageCallback callback) {
        assertRunOnServiceThread();
        if (mMessageValidator.isValid(command)) {
            mCecController.sendCommand(command, callback);
        } else {
            mSpamSafeLogger.error("Invalid message type:" + command);
            if (callback != null) {
                callback.onSendCompleted(Constants.SEND_RESULT_FAILURE);
            }
        }
    }

    @ServiceThreadOnly
    void sendCecCommand(HdmiCecMessage command) {
        assertRunOnServiceThread();
        sendCecCommand(command, null);
    }

    @ServiceThreadOnly
    void sendMhlSubcommand(int portId, HdmiMhlSubcommand command) {
        assertRunOnServiceThread();
        sendMhlSubcommand(portId, command, null);
    }

    @ServiceThreadOnly
    void sendMhlSubcommand(int portId, HdmiMhlSubcommand command, SendMessageCallback callback) {
        assertRunOnServiceThread();
        mMhlController.sendSubcommand(portId, command, callback);
    }

    /**
     * Send <Feature Abort> command on the given CEC message if possible.
     * If the aborted message is invalid, then it wont send the message.
     * @param command original command to be aborted
     * @param reason reason of feature abort
     */
    @ServiceThreadOnly
    void maySendFeatureAbortCommand(HdmiCecMessage command, int reason) {
        assertRunOnServiceThread();
        mCecController.maySendFeatureAbortCommand(command, reason);
    }

    @ServiceThreadOnly
    boolean handleCecCommand(HdmiCecMessage message) {
        assertRunOnServiceThread();
        if (!mMessageValidator.isValid(message)) {
            return false;
        }
        return dispatchMessageToLocalDevice(message);
    }

    void setAudioReturnChannel(boolean enabled) {
        mCecController.setAudioReturnChannel(enabled);
    }

    @ServiceThreadOnly
    private boolean dispatchMessageToLocalDevice(HdmiCecMessage message) {
        assertRunOnServiceThread();
        for (HdmiCecLocalDevice device : mCecController.getLocalDeviceList()) {
            if (device.dispatchMessage(message)
                    && message.getDestination() != Constants.ADDR_BROADCAST) {
                return true;
            }
        }

        if (message.getDestination() != Constants.ADDR_BROADCAST) {
            mSpamSafeLogger.warning("Unhandled cec command:" + message);
        }
        return false;
    }

    /**
     * Called when a new hotplug event is issued.
     *
     * @param portId hdmi port number where hot plug event issued.
     * @param connected whether to be plugged in or not
     */
    @ServiceThreadOnly
    void onHotplug(int portId, boolean connected) {
        assertRunOnServiceThread();
        for (HdmiCecLocalDevice device : mCecController.getLocalDeviceList()) {
            device.onHotplug(portId, connected);
        }
        announceHotplugEvent(portId, connected);
    }

    /**
     * Poll all remote devices. It sends &lt;Polling Message&gt; to all remote
     * devices.
     *
     * @param callback an interface used to get a list of all remote devices' address
     * @param sourceAddress a logical address of source device where sends polling message
     * @param pickStrategy strategy how to pick polling candidates
     * @param retryCount the number of retry used to send polling message to remote devices
     * @throw IllegalArgumentException if {@code pickStrategy} is invalid value
     */
    @ServiceThreadOnly
    void pollDevices(DevicePollingCallback callback, int sourceAddress, int pickStrategy,
            int retryCount) {
        assertRunOnServiceThread();
        mCecController.pollDevices(callback, sourceAddress, checkPollStrategy(pickStrategy),
                retryCount);
    }

    private int checkPollStrategy(int pickStrategy) {
        int strategy = pickStrategy & Constants.POLL_STRATEGY_MASK;
        if (strategy == 0) {
            throw new IllegalArgumentException("Invalid poll strategy:" + pickStrategy);
        }
        int iterationStrategy = pickStrategy & Constants.POLL_ITERATION_STRATEGY_MASK;
        if (iterationStrategy == 0) {
            throw new IllegalArgumentException("Invalid iteration strategy:" + pickStrategy);
        }
        return strategy | iterationStrategy;
    }

    List<HdmiCecLocalDevice> getAllLocalDevices() {
        assertRunOnServiceThread();
        return mCecController.getLocalDeviceList();
    }

    Object getServiceLock() {
        return mLock;
    }

    void setAudioStatus(boolean mute, int volume) {
        AudioManager audioManager = getAudioManager();
        boolean muted = audioManager.isStreamMute(AudioManager.STREAM_MUSIC);
        if (mute) {
            if (!muted) {
                audioManager.setStreamMute(AudioManager.STREAM_MUSIC, true);
            }
        } else {
            if (muted) {
                audioManager.setStreamMute(AudioManager.STREAM_MUSIC, false);
            }
            // FLAG_HDMI_SYSTEM_AUDIO_VOLUME prevents audio manager from announcing
            // volume change notification back to hdmi control service.
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, volume,
                    AudioManager.FLAG_SHOW_UI |
                    AudioManager.FLAG_HDMI_SYSTEM_AUDIO_VOLUME);
        }
    }

    void announceSystemAudioModeChange(boolean enabled) {
        synchronized (mLock) {
            for (SystemAudioModeChangeListenerRecord record :
                    mSystemAudioModeChangeListenerRecords) {
                invokeSystemAudioModeChangeLocked(record.mListener, enabled);
            }
        }
    }

    private HdmiDeviceInfo createDeviceInfo(int logicalAddress, int deviceType, int powerStatus) {
        // TODO: find better name instead of model name.
        String displayName = Build.MODEL;
        return new HdmiDeviceInfo(logicalAddress,
                getPhysicalAddress(), pathToPortId(getPhysicalAddress()), deviceType,
                getVendorId(), displayName);
    }

    @ServiceThreadOnly
    boolean handleMhlSubcommand(int portId, HdmiMhlSubcommand message) {
        assertRunOnServiceThread();

        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);
        if (device != null) {
            return device.handleSubcommand(message);
        }
        Slog.w(TAG, "No mhl device exists[portId:" + portId + ", message:" + message);
        return false;
    }

    @ServiceThreadOnly
    void handleMhlHotplugEvent(int portId, boolean connected) {
        assertRunOnServiceThread();
        if (connected) {
            HdmiMhlLocalDevice newDevice = new HdmiMhlLocalDevice(this, portId);
            HdmiMhlLocalDevice oldDevice = mMhlController.addLocalDevice(newDevice);
            if (oldDevice != null) {
                oldDevice.onDeviceRemoved();
                Slog.i(TAG, "Old device of port " + portId + " is removed");
            }
        } else {
            HdmiMhlLocalDevice device = mMhlController.removeLocalDevice(portId);
            if (device != null) {
                device.onDeviceRemoved();
                // There is no explicit event for device removal unlike capability register event
                // used for device addition . Hence we remove the device on hotplug event.
                invokeDeviceEventListeners(device.getInfo(), DEVICE_EVENT_REMOVE_DEVICE);
                updateSafeMhlInput();
            } else {
                Slog.w(TAG, "No device to remove:[portId=" + portId);
            }
        }
        announceHotplugEvent(portId, connected);
    }

    @ServiceThreadOnly
    void handleMhlCbusModeChanged(int portId, int cbusmode) {
        assertRunOnServiceThread();
        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);
        if (device != null) {
            device.setCbusMode(cbusmode);
        } else {
            Slog.w(TAG, "No mhl device exists for cbus mode change[portId:" + portId +
                    ", cbusmode:" + cbusmode + "]");
        }
    }

    @ServiceThreadOnly
    void handleMhlVbusOvercurrent(int portId, boolean on) {
        assertRunOnServiceThread();
        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);
        if (device != null) {
            device.onVbusOvercurrentDetected(on);
        } else {
            Slog.w(TAG, "No mhl device exists for vbus overcurrent event[portId:" + portId + "]");
        }
    }

    @ServiceThreadOnly
    void handleMhlCapabilityRegisterChanged(int portId, int adopterId, int deviceId) {
        assertRunOnServiceThread();
        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);

        // Hotplug event should already have been called before capability register change event.
        if (device != null) {
            device.setCapabilityRegister(adopterId, deviceId);
            invokeDeviceEventListeners(device.getInfo(), DEVICE_EVENT_ADD_DEVICE);
            updateSafeMhlInput();
        } else {
            Slog.w(TAG, "No mhl device exists for capability register change event[portId:"
                    + portId + ", adopterId:" + adopterId + ", deviceId:" + deviceId + "]");
        }
    }

    @ServiceThreadOnly
    private void updateSafeMhlInput() {
        assertRunOnServiceThread();
        List<HdmiDeviceInfo> inputs = Collections.emptyList();
        SparseArray<HdmiMhlLocalDevice> devices = mMhlController.getAllLocalDevices();
        for (int i = 0; i < devices.size(); ++i) {
            HdmiMhlLocalDevice device = devices.valueAt(i);
            HdmiDeviceInfo info = device.getInfo();
            if (info != null) {
                if (inputs.isEmpty()) {
                    inputs = new ArrayList<>();
                }
                inputs.add(device.getInfo());
            }
        }
        synchronized (mLock) {
            mMhlDevices = inputs;
        }
    }

    private List<HdmiDeviceInfo> getMhlDevicesLocked() {
        return mMhlDevices;
    }

    // Record class that monitors the event of the caller of being killed. Used to clean up
    // the listener list and record list accordingly.
    private final class HotplugEventListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiHotplugEventListener mListener;

        public HotplugEventListenerRecord(IHdmiHotplugEventListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mHotplugEventListenerRecords.remove(this);
            }
        }
    }

    private final class DeviceEventListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiDeviceEventListener mListener;

        public DeviceEventListenerRecord(IHdmiDeviceEventListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mDeviceEventListenerRecords.remove(this);
            }
        }
    }

    private final class SystemAudioModeChangeListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiSystemAudioModeChangeListener mListener;

        public SystemAudioModeChangeListenerRecord(IHdmiSystemAudioModeChangeListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mSystemAudioModeChangeListenerRecords.remove(this);
            }
        }
    }

    class VendorCommandListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiVendorCommandListener mListener;
        private final int mDeviceType;

        public VendorCommandListenerRecord(IHdmiVendorCommandListener listener, int deviceType) {
            mListener = listener;
            mDeviceType = deviceType;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mVendorCommandListenerRecords.remove(this);
            }
        }
    }

    private class HdmiRecordListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiRecordListener mListener;

        public HdmiRecordListenerRecord(IHdmiRecordListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mRecordListenerRecord = null;
            }
        }
    }

    private class HdmiMhlScratchpadCommandListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiMhlScratchpadCommandListener mListener;

        public HdmiMhlScratchpadCommandListenerRecord(IHdmiMhlScratchpadCommandListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            mScratchpadCommandListenerRecords.remove(this);
        }
    }

    private void enforceAccessPermission() {
        getContext().enforceCallingOrSelfPermission(PERMISSION, TAG);
    }

    private final class BinderService extends IHdmiControlService.Stub {
        @Override
        public int[] getSupportedTypes() {
            enforceAccessPermission();
            // mLocalDevices is an unmodifiable list - no lock necesary.
            int[] localDevices = new int[mLocalDevices.size()];
            for (int i = 0; i < localDevices.length; ++i) {
                localDevices[i] = mLocalDevices.get(i);
            }
            return localDevices;
        }

        @Override
        public HdmiDeviceInfo getActiveSource() {
            HdmiCecLocalDeviceTv tv = tv();
            if (tv == null) {
                Slog.w(TAG, "Local tv device not available");
                return null;
            }
            ActiveSource activeSource = tv.getActiveSource();
            if (activeSource.isValid()) {
                return new HdmiDeviceInfo(activeSource.logicalAddress,
                        activeSource.physicalAddress, HdmiDeviceInfo.PORT_INVALID,
                        HdmiDeviceInfo.DEVICE_INACTIVE, 0, "");
            }
            int activePath = tv.getActivePath();
            if (activePath != HdmiDeviceInfo.PATH_INVALID) {
                return new HdmiDeviceInfo(activePath, tv.getActivePortId());
            }
            return null;
        }

        @Override
        public void deviceSelect(final int deviceId, final IHdmiControlCallback callback) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (callback == null) {
                        Slog.e(TAG, "Callback cannot be null");
                        return;
                    }
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available");
                        invokeCallback(callback, HdmiControlManager.RESULT_SOURCE_NOT_AVAILABLE);
                        return;
                    }
                    if (mMhlController != null) {
                        HdmiMhlLocalDevice device = mMhlController.getLocalDeviceById(deviceId);
                        if (device != null) {
                            if (device.getPortId() == tv.getActivePortId()) {
                                invokeCallback(callback, HdmiControlManager.RESULT_SUCCESS);
                                return;
                            }
                            // Upon selecting MHL device, we send RAP[Content On] to wake up
                            // the connected mobile device, start routing control to switch ports.
                            // callback is handled by MHL action.
                            device.turnOn(callback);
                            tv.doManualPortSwitching(device.getInfo().getPortId(), null);
                            return;
                        }
                    }
                    tv.deviceSelect(deviceId, callback);
                }
            });
        }

        @Override
        public void portSelect(final int portId, final IHdmiControlCallback callback) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (callback == null) {
                        Slog.e(TAG, "Callback cannot be null");
                        return;
                    }
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available");
                        invokeCallback(callback, HdmiControlManager.RESULT_SOURCE_NOT_AVAILABLE);
                        return;
                    }
                    tv.doManualPortSwitching(portId, callback);
                }
            });
        }

        @Override
        public void sendKeyEvent(final int deviceType, final int keyCode, final boolean isPressed) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (mMhlController != null) {
                        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(mActivePortId);
                        if (device != null) {
                            device.sendKeyEvent(keyCode, isPressed);
                            return;
                        }
                    }
                    if (mCecController != null) {
                        HdmiCecLocalDevice localDevice = mCecController.getLocalDevice(deviceType);
                        if (localDevice == null) {
                            Slog.w(TAG, "Local device not available");
                            return;
                        }
                        localDevice.sendKeyEvent(keyCode, isPressed);
                    }
                }
            });
        }

        @Override
        public void oneTouchPlay(final IHdmiControlCallback callback) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiControlService.this.oneTouchPlay(callback);
                }
            });
        }

        @Override
        public void queryDisplayStatus(final IHdmiControlCallback callback) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiControlService.this.queryDisplayStatus(callback);
                }
            });
        }

        @Override
        public void addHotplugEventListener(final IHdmiHotplugEventListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.addHotplugEventListener(listener);
        }

        @Override
        public void removeHotplugEventListener(final IHdmiHotplugEventListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.removeHotplugEventListener(listener);
        }

        @Override
        public void addDeviceEventListener(final IHdmiDeviceEventListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.addDeviceEventListener(listener);
        }

        @Override
        public List<HdmiPortInfo> getPortInfo() {
            enforceAccessPermission();
            return HdmiControlService.this.getPortInfo();
        }

        @Override
        public boolean canChangeSystemAudioMode() {
            enforceAccessPermission();
            HdmiCecLocalDeviceTv tv = tv();
            if (tv == null) {
                return false;
            }
            return tv.hasSystemAudioDevice();
        }

        @Override
        public boolean getSystemAudioMode() {
            enforceAccessPermission();
            HdmiCecLocalDeviceTv tv = tv();
            if (tv == null) {
                return false;
            }
            return tv.isSystemAudioActivated();
        }

        @Override
        public void setSystemAudioMode(final boolean enabled, final IHdmiControlCallback callback) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available");
                        invokeCallback(callback, HdmiControlManager.RESULT_SOURCE_NOT_AVAILABLE);
                        return;
                    }
                    tv.changeSystemAudioMode(enabled, callback);
                }
            });
        }

        @Override
        public void addSystemAudioModeChangeListener(
                final IHdmiSystemAudioModeChangeListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.addSystemAudioModeChangeListner(listener);
        }

        @Override
        public void removeSystemAudioModeChangeListener(
                final IHdmiSystemAudioModeChangeListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.removeSystemAudioModeChangeListener(listener);
        }

        @Override
        public void setInputChangeListener(final IHdmiInputChangeListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.setInputChangeListener(listener);
        }

        @Override
        public List<HdmiDeviceInfo> getInputDevices() {
            enforceAccessPermission();
            // No need to hold the lock for obtaining TV device as the local device instance
            // is preserved while the HDMI control is enabled.
            HdmiCecLocalDeviceTv tv = tv();
            synchronized (mLock) {
                List<HdmiDeviceInfo> cecDevices = (tv == null)
                        ? Collections.<HdmiDeviceInfo>emptyList()
                        : tv.getSafeExternalInputsLocked();
                return HdmiUtils.mergeToUnmodifiableList(cecDevices, getMhlDevicesLocked());
            }
        }

        @Override
        public void setSystemAudioVolume(final int oldIndex, final int newIndex,
                final int maxIndex) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available");
                        return;
                    }
                    tv.changeVolume(oldIndex, newIndex - oldIndex, maxIndex);
                }
            });
        }

        @Override
        public void setSystemAudioMute(final boolean mute) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available");
                        return;
                    }
                    tv.changeMute(mute);
                }
            });
        }

        @Override
        public void setArcMode(final boolean enabled) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiCecLocalDeviceTv tv = tv();
                    if (tv == null) {
                        Slog.w(TAG, "Local tv device not available to change arc mode.");
                        return;
                    }
                }
            });
        }

        @Override
        public void setProhibitMode(final boolean enabled) {
            enforceAccessPermission();
            if (!isTvDevice()) {
                return;
            }
            HdmiControlService.this.setProhibitMode(enabled);
        }

        @Override
        public void addVendorCommandListener(final IHdmiVendorCommandListener listener,
                final int deviceType) {
            enforceAccessPermission();
            HdmiControlService.this.addVendorCommandListener(listener, deviceType);
        }

        @Override
        public void sendVendorCommand(final int deviceType, final int targetAddress,
                final byte[] params, final boolean hasVendorId) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    HdmiCecLocalDevice device = mCecController.getLocalDevice(deviceType);
                    if (device == null) {
                        Slog.w(TAG, "Local device not available");
                        return;
                    }
                    if (hasVendorId) {
                        sendCecCommand(HdmiCecMessageBuilder.buildVendorCommandWithId(
                                device.getDeviceInfo().getLogicalAddress(), targetAddress,
                                getVendorId(), params));
                    } else {
                        sendCecCommand(HdmiCecMessageBuilder.buildVendorCommand(
                                device.getDeviceInfo().getLogicalAddress(), targetAddress, params));
                    }
                }
            });
        }

        @Override
        public void setHdmiRecordListener(IHdmiRecordListener listener) {
            HdmiControlService.this.setHdmiRecordListener(listener);
        }

        @Override
        public void startOneTouchRecord(final int recorderAddress, final byte[] recordSource) {
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (!isTvDevice()) {
                        Slog.w(TAG, "No TV is available.");
                        return;
                    }
                    tv().startOneTouchRecord(recorderAddress, recordSource);
                }
            });
        }

        @Override
        public void stopOneTouchRecord(final int recorderAddress) {
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (!isTvDevice()) {
                        Slog.w(TAG, "No TV is available.");
                        return;
                    }
                    tv().stopOneTouchRecord(recorderAddress);
                }
            });
        }

        @Override
        public void startTimerRecording(final int recorderAddress, final int sourceType,
                final byte[] recordSource) {
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (!isTvDevice()) {
                        Slog.w(TAG, "No TV is available.");
                        return;
                    }
                    tv().startTimerRecording(recorderAddress, sourceType, recordSource);
                }
            });
        }

        @Override
        public void clearTimerRecording(final int recorderAddress, final int sourceType,
                final byte[] recordSource) {
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (!isTvDevice()) {
                        Slog.w(TAG, "No TV is available.");
                        return;
                    }
                    tv().clearTimerRecording(recorderAddress, sourceType, recordSource);
                }
            });
        }

        @Override
        public void sendScratchpadCommand(final int portId, final int offset, final int length,
                final byte[] data) {
            enforceAccessPermission();
            runOnServiceThread(new Runnable() {
                @Override
                public void run() {
                    if (mMhlController == null) {
                        Slog.w(TAG, "No Mhl controller available.");
                        return;
                    }
                    if (!isControlEnabled()) {
                        Slog.w(TAG, "Hdmi control is disabled.");
                        return ;
                    }
                    HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);
                    if (device == null) {
                        Slog.w(TAG, "Invalid port id:" + portId);
                        return;
                    }
                    mMhlController.sendScratchpadCommand(portId, offset, length, data);
                }
            });
        }

        @Override
        public void addHdmiMhlScratchpadCommandListener(
                IHdmiMhlScratchpadCommandListener listener) {
            enforceAccessPermission();
            HdmiControlService.this.addHdmiMhlScratchpadCommandListener(listener);
        }
    }

    @ServiceThreadOnly
    private void oneTouchPlay(final IHdmiControlCallback callback) {
        assertRunOnServiceThread();
        HdmiCecLocalDevicePlayback source = playback();
        if (source == null) {
            Slog.w(TAG, "Local playback device not available");
            invokeCallback(callback, HdmiControlManager.RESULT_SOURCE_NOT_AVAILABLE);
            return;
        }
        source.oneTouchPlay(callback);
    }

    @ServiceThreadOnly
    private void queryDisplayStatus(final IHdmiControlCallback callback) {
        assertRunOnServiceThread();
        HdmiCecLocalDevicePlayback source = playback();
        if (source == null) {
            Slog.w(TAG, "Local playback device not available");
            invokeCallback(callback, HdmiControlManager.RESULT_SOURCE_NOT_AVAILABLE);
            return;
        }
        source.queryDisplayStatus(callback);
    }

    private void addHotplugEventListener(IHdmiHotplugEventListener listener) {
        HotplugEventListenerRecord record = new HotplugEventListenerRecord(listener);
        try {
            listener.asBinder().linkToDeath(record, 0);
        } catch (RemoteException e) {
            Slog.w(TAG, "Listener already died");
            return;
        }
        synchronized (mLock) {
            mHotplugEventListenerRecords.add(record);
        }
    }

    private void removeHotplugEventListener(IHdmiHotplugEventListener listener) {
        synchronized (mLock) {
            for (HotplugEventListenerRecord record : mHotplugEventListenerRecords) {
                if (record.mListener.asBinder() == listener.asBinder()) {
                    listener.asBinder().unlinkToDeath(record, 0);
                    mHotplugEventListenerRecords.remove(record);
                    break;
                }
            }
        }
    }

    private void addDeviceEventListener(IHdmiDeviceEventListener listener) {
        DeviceEventListenerRecord record = new DeviceEventListenerRecord(listener);
        try {
            listener.asBinder().linkToDeath(record, 0);
        } catch (RemoteException e) {
            Slog.w(TAG, "Listener already died");
            return;
        }
        synchronized (mLock) {
            mDeviceEventListenerRecords.add(record);
        }
    }

    void invokeDeviceEventListeners(HdmiDeviceInfo device, int status) {
        synchronized (mLock) {
            for (DeviceEventListenerRecord record : mDeviceEventListenerRecords) {
                try {
                    record.mListener.onStatusChanged(device, status);
                } catch (RemoteException e) {
                    Slog.e(TAG, "Failed to report device event:" + e);
                }
            }
        }
    }

    private void addSystemAudioModeChangeListner(IHdmiSystemAudioModeChangeListener listener) {
        SystemAudioModeChangeListenerRecord record = new SystemAudioModeChangeListenerRecord(
                listener);
        try {
            listener.asBinder().linkToDeath(record, 0);
        } catch (RemoteException e) {
            Slog.w(TAG, "Listener already died");
            return;
        }
        synchronized (mLock) {
            mSystemAudioModeChangeListenerRecords.add(record);
        }
    }

    private void removeSystemAudioModeChangeListener(IHdmiSystemAudioModeChangeListener listener) {
        synchronized (mLock) {
            for (SystemAudioModeChangeListenerRecord record :
                    mSystemAudioModeChangeListenerRecords) {
                if (record.mListener.asBinder() == listener) {
                    listener.asBinder().unlinkToDeath(record, 0);
                    mSystemAudioModeChangeListenerRecords.remove(record);
                    break;
                }
            }
        }
    }

    private final class InputChangeListenerRecord implements IBinder.DeathRecipient {
        private final IHdmiInputChangeListener mListener;

        public InputChangeListenerRecord(IHdmiInputChangeListener listener) {
            mListener = listener;
        }

        @Override
        public void binderDied() {
            synchronized (mLock) {
                mInputChangeListenerRecord = null;
            }
        }
    }

    private void setInputChangeListener(IHdmiInputChangeListener listener) {
        synchronized (mLock) {
            mInputChangeListenerRecord = new InputChangeListenerRecord(listener);
            try {
                listener.asBinder().linkToDeath(mInputChangeListenerRecord, 0);
            } catch (RemoteException e) {
                Slog.w(TAG, "Listener already died");
                return;
            }
        }
    }

    void invokeInputChangeListener(HdmiDeviceInfo info) {
        synchronized (mLock) {
            if (mInputChangeListenerRecord != null) {
                try {
                    mInputChangeListenerRecord.mListener.onChanged(info);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Exception thrown by IHdmiInputChangeListener: " + e);
                }
            }
        }
    }

    private void setHdmiRecordListener(IHdmiRecordListener listener) {
        synchronized (mLock) {
            mRecordListenerRecord = new HdmiRecordListenerRecord(listener);
            try {
                listener.asBinder().linkToDeath(mRecordListenerRecord, 0);
            } catch (RemoteException e) {
                Slog.w(TAG, "Listener already died.", e);
            }
        }
    }

    byte[] invokeRecordRequestListener(int recorderAddress) {
        synchronized (mLock) {
            if (mRecordListenerRecord != null) {
                try {
                    return mRecordListenerRecord.mListener.getOneTouchRecordSource(recorderAddress);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Failed to start record.", e);
                }
            }
            return EmptyArray.BYTE;
        }
    }

    void invokeOneTouchRecordResult(int result) {
        synchronized (mLock) {
            if (mRecordListenerRecord != null) {
                try {
                    mRecordListenerRecord.mListener.onOneTouchRecordResult(result);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Failed to call onOneTouchRecordResult.", e);
                }
            }
        }
    }

    void invokeTimerRecordingResult(int result) {
        synchronized (mLock) {
            if (mRecordListenerRecord != null) {
                try {
                    mRecordListenerRecord.mListener.onTimerRecordingResult(result);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Failed to call onTimerRecordingResult.", e);
                }
            }
        }
    }

    void invokeClearTimerRecordingResult(int result) {
        synchronized (mLock) {
            if (mRecordListenerRecord != null) {
                try {
                    mRecordListenerRecord.mListener.onClearTimerRecordingResult(result);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Failed to call onClearTimerRecordingResult.", e);
                }
            }
        }
    }

    private void invokeCallback(IHdmiControlCallback callback, int result) {
        try {
            callback.onComplete(result);
        } catch (RemoteException e) {
            Slog.e(TAG, "Invoking callback failed:" + e);
        }
    }

    private void invokeSystemAudioModeChangeLocked(IHdmiSystemAudioModeChangeListener listener,
            boolean enabled) {
        try {
            listener.onStatusChanged(enabled);
        } catch (RemoteException e) {
            Slog.e(TAG, "Invoking callback failed:" + e);
        }
    }

    private void announceHotplugEvent(int portId, boolean connected) {
        HdmiHotplugEvent event = new HdmiHotplugEvent(portId, connected);
        synchronized (mLock) {
            for (HotplugEventListenerRecord record : mHotplugEventListenerRecords) {
                invokeHotplugEventListenerLocked(record.mListener, event);
            }
        }
    }

    private void invokeHotplugEventListenerLocked(IHdmiHotplugEventListener listener,
            HdmiHotplugEvent event) {
        try {
            listener.onReceived(event);
        } catch (RemoteException e) {
            Slog.e(TAG, "Failed to report hotplug event:" + event.toString(), e);
        }
    }

    private HdmiCecLocalDeviceTv tv() {
        return (HdmiCecLocalDeviceTv) mCecController.getLocalDevice(HdmiDeviceInfo.DEVICE_TV);
    }

    boolean isTvDevice() {
        return tv() != null;
    }

    private HdmiCecLocalDevicePlayback playback() {
        return (HdmiCecLocalDevicePlayback)
                mCecController.getLocalDevice(HdmiDeviceInfo.DEVICE_PLAYBACK);
    }

    AudioManager getAudioManager() {
        return (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
    }

    boolean isControlEnabled() {
        synchronized (mLock) {
            return mHdmiControlEnabled;
        }
    }

    @ServiceThreadOnly
    int getPowerStatus() {
        assertRunOnServiceThread();
        return mPowerStatus;
    }

    @ServiceThreadOnly
    boolean isPowerOnOrTransient() {
        assertRunOnServiceThread();
        return mPowerStatus == HdmiControlManager.POWER_STATUS_ON
                || mPowerStatus == HdmiControlManager.POWER_STATUS_TRANSIENT_TO_ON;
    }

    @ServiceThreadOnly
    boolean isPowerStandbyOrTransient() {
        assertRunOnServiceThread();
        return mPowerStatus == HdmiControlManager.POWER_STATUS_STANDBY
                || mPowerStatus == HdmiControlManager.POWER_STATUS_TRANSIENT_TO_STANDBY;
    }

    @ServiceThreadOnly
    boolean isPowerStandby() {
        assertRunOnServiceThread();
        return mPowerStatus == HdmiControlManager.POWER_STATUS_STANDBY;
    }

    @ServiceThreadOnly
    void wakeUp() {
        assertRunOnServiceThread();
        mWakeUpMessageReceived = true;
        PowerManager pm = (PowerManager) getContext().getSystemService(Context.POWER_SERVICE);
        pm.wakeUp(SystemClock.uptimeMillis());
        // PowerManger will send the broadcast Intent.ACTION_SCREEN_ON and after this gets
        // the intent, the sequence will continue at onWakeUp().
    }

    @ServiceThreadOnly
    void standby() {
        assertRunOnServiceThread();
        mStandbyMessageReceived = true;
        PowerManager pm = (PowerManager) getContext().getSystemService(Context.POWER_SERVICE);
        pm.goToSleep(SystemClock.uptimeMillis(), PowerManager.GO_TO_SLEEP_REASON_HDMI, 0);
        // PowerManger will send the broadcast Intent.ACTION_SCREEN_OFF and after this gets
        // the intent, the sequence will continue at onStandby().
    }

    @ServiceThreadOnly
    private void onWakeUp() {
        assertRunOnServiceThread();
        mPowerStatus = HdmiControlManager.POWER_STATUS_TRANSIENT_TO_ON;
        if (mCecController != null) {
            if (mHdmiControlEnabled) {
                int startReason = INITIATED_BY_SCREEN_ON;
                if (mWakeUpMessageReceived) {
                    startReason = INITIATED_BY_WAKE_UP_MESSAGE;
                }
                initializeCec(startReason);
            }
        } else {
            Slog.i(TAG, "Device does not support HDMI-CEC.");
        }
        // TODO: Initialize MHL local devices.
    }

    @ServiceThreadOnly
    private void onStandby() {
        assertRunOnServiceThread();
        mPowerStatus = HdmiControlManager.POWER_STATUS_TRANSIENT_TO_STANDBY;

        final List<HdmiCecLocalDevice> devices = getAllLocalDevices();
        disableDevices(new PendingActionClearedCallback() {
            @Override
            public void onCleared(HdmiCecLocalDevice device) {
                Slog.v(TAG, "On standby-action cleared:" + device.mDeviceType);
                devices.remove(device);
                if (devices.isEmpty()) {
                    onStandbyCompleted();
                    // We will not clear local devices here, since some OEM/SOC will keep passing
                    // the received packets until the application processor enters to the sleep
                    // actually.
                }
            }
        });
    }

    @ServiceThreadOnly
    private void onLanguageChanged(String language) {
        assertRunOnServiceThread();
        mLanguage = language;

        if (isTvDevice()) {
            tv().broadcastMenuLanguage(language);
        }
    }

    @ServiceThreadOnly
    String getLanguage() {
        assertRunOnServiceThread();
        return mLanguage;
    }

    private void disableDevices(PendingActionClearedCallback callback) {
        if (mCecController != null) {
            for (HdmiCecLocalDevice device : mCecController.getLocalDeviceList()) {
                device.disableDevice(mStandbyMessageReceived, callback);
            }
            if (isTvDevice()) {
                unregisterSettingsObserver();
            }
        }

        if (mMhlController != null) {
            mMhlController.clearAllLocalDevices();
        }
    }

    @ServiceThreadOnly
    private void clearLocalDevices() {
        assertRunOnServiceThread();
        if (mCecController == null) {
            return;
        }
        mCecController.clearLogicalAddress();
        mCecController.clearLocalDevices();
    }

    @ServiceThreadOnly
    private void onStandbyCompleted() {
        assertRunOnServiceThread();
        Slog.v(TAG, "onStandbyCompleted");

        if (mPowerStatus != HdmiControlManager.POWER_STATUS_TRANSIENT_TO_STANDBY) {
            return;
        }
        mPowerStatus = HdmiControlManager.POWER_STATUS_STANDBY;
        for (HdmiCecLocalDevice device : mCecController.getLocalDeviceList()) {
            device.onStandby(mStandbyMessageReceived);
        }
        mStandbyMessageReceived = false;
        mCecController.setOption(OPTION_CEC_SERVICE_CONTROL, DISABLED);
    }

    private void addVendorCommandListener(IHdmiVendorCommandListener listener, int deviceType) {
        VendorCommandListenerRecord record = new VendorCommandListenerRecord(listener, deviceType);
        try {
            listener.asBinder().linkToDeath(record, 0);
        } catch (RemoteException e) {
            Slog.w(TAG, "Listener already died");
            return;
        }
        synchronized (mLock) {
            mVendorCommandListenerRecords.add(record);
        }
    }

    void invokeVendorCommandListeners(int deviceType, int srcAddress, byte[] params,
            boolean hasVendorId) {
        synchronized (mLock) {
            for (VendorCommandListenerRecord record : mVendorCommandListenerRecords) {
                if (record.mDeviceType != deviceType) {
                    continue;
                }
                try {
                    record.mListener.onReceived(srcAddress, params, hasVendorId);
                } catch (RemoteException e) {
                    Slog.e(TAG, "Failed to notify vendor command reception", e);
                }
            }
        }
    }

    private void addHdmiMhlScratchpadCommandListener(IHdmiMhlScratchpadCommandListener listener) {
        HdmiMhlScratchpadCommandListenerRecord record =
                new HdmiMhlScratchpadCommandListenerRecord(listener);
        try {
            listener.asBinder().linkToDeath(record, 0);
        } catch (RemoteException e) {
            Slog.w(TAG, "Listener already died.");
            return;
        }

        synchronized (mLock) {
            mScratchpadCommandListenerRecords.add(record);
        }
    }

    void invokeScratchpadCommandListeners(int portId, int offest, int length, byte[] data) {
        synchronized (mLock) {
            for (HdmiMhlScratchpadCommandListenerRecord record :
                    mScratchpadCommandListenerRecords) {
                try {
                    record.mListener.onReceived(portId, offest, length, data);
                } catch (RemoteException e) {
                    Slog.e(TAG, "Failed to notify scratchpad command", e);
                }
            }
        }
    }

    boolean isProhibitMode() {
        synchronized (mLock) {
            return mProhibitMode;
        }
    }

    void setProhibitMode(boolean enabled) {
        synchronized (mLock) {
            mProhibitMode = enabled;
        }
    }

    @ServiceThreadOnly
    void setCecOption(int key, int value) {
        assertRunOnServiceThread();
        mCecController.setOption(key, value);
    }

    @ServiceThreadOnly
    void setControlEnabled(boolean enabled) {
        assertRunOnServiceThread();

        int value = toInt(enabled);
        mCecController.setOption(OPTION_CEC_ENABLE, value);
        if (mMhlController != null) {
            mMhlController.setOption(OPTION_MHL_ENABLE, value);
        }

        synchronized (mLock) {
            mHdmiControlEnabled = enabled;
        }

        if (enabled) {
            initializeCec(INITIATED_BY_ENABLE_CEC);
        } else {
            disableDevices(new PendingActionClearedCallback() {
                @Override
                public void onCleared(HdmiCecLocalDevice device) {
                    assertRunOnServiceThread();
                    clearLocalDevices();
                }
            });
        }
    }

    @ServiceThreadOnly
    void setActivePortId(int portId) {
        assertRunOnServiceThread();
        mActivePortId = portId;

        // Resets last input for MHL, which stays valid only after the MHL device was selected,
        // and no further switching is done.
        setLastInputForMhl(Constants.INVALID_PORT_ID);
    }

    @ServiceThreadOnly
    void setLastInputForMhl(int portId) {
        assertRunOnServiceThread();
        mLastInputMhl = portId;
    }

    @ServiceThreadOnly
    int getLastInputForMhl() {
        assertRunOnServiceThread();
        return mLastInputMhl;
    }

    /**
     * Performs input change, routing control for MHL device.
     *
     * @param portId MHL port, or the last port to go back to if {@code contentOn} is false
     * @param contentOn {@code true} if RAP data is content on; otherwise false
     */
    @ServiceThreadOnly
    void changeInputForMhl(int portId, boolean contentOn) {
        assertRunOnServiceThread();
        final int lastInput = contentOn ? tv().getActivePortId() : Constants.INVALID_PORT_ID;
        tv().doManualPortSwitching(portId, new IHdmiControlCallback.Stub() {
            @Override
            public void onComplete(int result) throws RemoteException {
                // Keep the last input to switch back later when RAP[ContentOff] is received.
                // This effectively sets the port to invalid one if the switching is for
                // RAP[ContentOff].
                setLastInputForMhl(lastInput);
            }
        });

        // MHL device is always directly connected to the port. Update the active port ID to avoid
        // unnecessary post-routing control task.
        tv().setActivePortId(portId);

        // The port is either the MHL-enabled port where the mobile device is connected, or
        // the last port to go back to when RAP[ContentOff] is received. Note that the last port
        // may not be the MHL-enabled one. In this case the device info to be passed to
        // input change listener should be the one describing the corresponding HDMI port.
        HdmiMhlLocalDevice device = mMhlController.getLocalDevice(portId);
        HdmiDeviceInfo info = (device != null && device.getInfo() != null)
                ? device.getInfo()
                : mPortDeviceMap.get(portId);
        invokeInputChangeListener(info);
    }

   void setMhlInputChangeEnabled(boolean enabled) {
        if (mMhlController != null) {
            mMhlController.setOption(OPTION_MHL_INPUT_SWITCHING, toInt(enabled));
        }

        synchronized (mLock) {
            mMhlInputChangeEnabled = enabled;
        }
    }

    boolean isMhlInputChangeEnabled() {
        synchronized (mLock) {
            return mMhlInputChangeEnabled;
        }
    }

    @ServiceThreadOnly
    void displayOsd(int messageId) {
        assertRunOnServiceThread();
        Intent intent = new Intent(HdmiControlManager.ACTION_OSD_MESSAGE);
        intent.putExtra(HdmiControlManager.EXTRA_MESSAGE_ID, messageId);
        getContext().sendBroadcastAsUser(intent, UserHandle.ALL,
                HdmiControlService.PERMISSION);
    }
}