Keep Bluetooth module hot to quickly swith it on/off (7f9ecca8) · Commits · e / os / android_frameworks_base

core/java/android/server/BluetoothAdapterStateMachine.java

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+513 −0

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		/*
		* Copyright (C) 2011 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 android.server;

		import android.bluetooth.BluetoothAdapter;
		import android.content.ContentResolver;
		import android.content.Context;
		import android.content.Intent;
		import android.os.Binder;
		import android.os.Message;
		import android.provider.Settings;
		import android.util.Log;

		import com.android.internal.util.IState;
		import com.android.internal.util.State;
		import com.android.internal.util.StateMachine;

		import java.io.PrintWriter;

		/**
		* Bluetooth Adapter StateMachine
		* All the states are at the same level, ie, no hierarchy.
		* (BluetootOn)
		* \| ^
		* TURN_OFF \| \| BECOME_PAIRABLE
		* AIRPLANE_MODE_ON \| \|
		* V \|
		* (Switching)
		* \| ^
		* BECOME_NON_PAIRABLE& \| \| TURN_ON(_CONTINUE)/TURN_ON_FOR_PRIVILEGED
		* ALL_DEVICES_DISCONNECTED \| \|
		* V \|
		* (HotOff)
		* / ^
		* / \| SERVICE_RECORD_LOADED
		* \| \|
		* TURN_COLD \| (Warmup)
		* \ ^
		* \ \| TURN_HOT/TURN_ON
		* \| \| AIRPLANE_MODE_OFF(when Bluetooth was on before)
		* V \|
		* (PowerOff) <----- initial state
		*
		*/
		final class BluetoothAdapterStateMachine extends StateMachine {
		private static final String TAG = "BluetoothAdapterStateMachine";
		private static final boolean DBG = false;

		// Message(what) to take an action
		//
		// We get this message when user tries to turn on BT
		public static final int USER_TURN_ON = 1;
		// We get this message when user tries to turn off BT
		public static final int USER_TURN_OFF = 2;

		// Message(what) to report a event that the state machine need to respond to
		//
		// Event indicates sevice records have been loaded
		public static final int SERVICE_RECORD_LOADED = 51;
		// Event indicates all the remote Bluetooth devices has been disconnected
		public static final int ALL_DEVICES_DISCONNECTED = 52;
		// Event indicates the Bluetooth is connectable
		public static final int BECOME_PAIRABLE = 53;
		// Event indicates the Bluetooth is non-connectable.
		public static final int BECOME_NON_PAIRABLE = 54;
		// Event indicates airplane mode is turned on
		public static final int AIRPLANE_MODE_ON = 55;
		// Event indicates airplane mode is turned off
		public static final int AIRPLANE_MODE_OFF = 56;

		// private internal messages
		//
		// Turn on Bluetooth Module, Load firmware, and do all the preparation
		// needed to get the Bluetooth Module ready but keep it not discoverable
		// and not connectable. This way the Bluetooth Module can be quickly
		// switched on if needed
		private static final int TURN_HOT = 101;
		// USER_TURN_ON is changed to TURN_ON_CONTINUE after we broadcast the
		// state change intent so that we will not broadcast the intent again in
		// other state
		private static final int TURN_ON_CONTINUE = 102;
		// Unload firmware, turning off Bluetooth module power
		private static final int TURN_COLD = 103;
		// For NFC, turn on bluetooth for certain process
		private static final int TURN_ON_FOR_PRIVILEGED = 104;

		private Context mContext;
		private BluetoothService mBluetoothService;
		private BluetoothEventLoop mEventLoop;

		private BluetoothOn mBluetoothOn;
		private Switching mSwitching;
		private HotOff mHotOff;
		private WarmUp mWarmUp;
		private PowerOff mPowerOff;

		// this is the BluetoothAdapter state that reported externally
		private int mPublicState;

		BluetoothAdapterStateMachine(Context context, BluetoothService bluetoothService,
		BluetoothAdapter bluetoothAdapter) {
		super(TAG);
		mContext = context;
		mBluetoothService = bluetoothService;
		mEventLoop = new BluetoothEventLoop(context, bluetoothAdapter, bluetoothService, this);

		mBluetoothOn = new BluetoothOn();
		mSwitching = new Switching();
		mHotOff = new HotOff();
		mWarmUp = new WarmUp();
		mPowerOff = new PowerOff();

		addState(mBluetoothOn);
		addState(mSwitching);
		addState(mHotOff);
		addState(mWarmUp);
		addState(mPowerOff);
		setInitialState(mPowerOff);
		mPublicState = BluetoothAdapter.STATE_OFF;

		if (mContext.getResources().getBoolean
		(com.android.internal.R.bool.config_bluetooth_adapter_quick_switch)) {
		sendMessage(TURN_HOT);
		}
		}

		/**
		* Bluetooth module's power is off, firmware is not loaded.
		*/
		private class PowerOff extends State {
		private boolean mPersistSwitchOn = false;

		@Override
		public void enter() {
		if (DBG) log("Enter PowerOff: " + mPersistSwitchOn);
		mPersistSwitchOn = false;
		}
		@Override
		public boolean processMessage(Message message) {
		if (DBG) log("PowerOff process message: " + message.what);

		boolean retValue = HANDLED;
		switch(message.what) {
		case USER_TURN_ON:
		// starts turning on BT module, broadcast this out
		transitionTo(mWarmUp);
		broadcastState(BluetoothAdapter.STATE_TURNING_ON);
		if (prepareBluetooth()) {
		// this is user request, save the setting
		if ((Boolean) message.obj) {
		mPersistSwitchOn = true;
		}
		// We will continue turn the BT on all the way to the BluetoothOn state
		deferMessage(obtainMessage(TURN_ON_CONTINUE));
		} else {
		Log.e(TAG, "failed to prepare bluetooth, abort turning on");
		transitionTo(mPowerOff);
		broadcastState(BluetoothAdapter.STATE_OFF);
		}
		break;
		case TURN_HOT:
		if (prepareBluetooth()) {
		transitionTo(mWarmUp);
		}
		break;
		case AIRPLANE_MODE_OFF:
		if (getBluetoothPersistedSetting()) {
		// starts turning on BT module, broadcast this out
		transitionTo(mWarmUp);
		broadcastState(BluetoothAdapter.STATE_TURNING_ON);
		if (prepareBluetooth()) {
		// We will continue turn the BT on all the way to the BluetoothOn state
		deferMessage(obtainMessage(TURN_ON_CONTINUE));
		transitionTo(mWarmUp);
		} else {
		Log.e(TAG, "failed to prepare bluetooth, abort turning on");
		transitionTo(mPowerOff);
		broadcastState(BluetoothAdapter.STATE_OFF);
		}
		}
		break;
		case AIRPLANE_MODE_ON: // ignore
		case USER_TURN_OFF: // ignore
		break;
		default:
		return NOT_HANDLED;
		}
		return retValue;
		}

		/**
		* Turn on Bluetooth Module, Load firmware, and do all the preparation
		* needed to get the Bluetooth Module ready but keep it not discoverable
		* and not connectable.
		* The last step of this method sets up the local service record DB.
		* There will be a event reporting the status of the SDP setup.
		*/
		private boolean prepareBluetooth() {
		if (mBluetoothService.enableNative() != 0) {
		return false;
		}

		// try to start event loop, give 2 attempts
		int retryCount = 2;
		boolean eventLoopStarted = false;
		while ((retryCount-- > 0) && !eventLoopStarted) {
		mEventLoop.start();
		// it may take a moment for the other thread to do its
		// thing. Check periodically for a while.
		int pollCount = 5;
		while ((pollCount-- > 0) && !eventLoopStarted) {
		if (mEventLoop.isEventLoopRunning()) {
		eventLoopStarted = true;
		break;
		}
		try {
		Thread.sleep(100);
		} catch (InterruptedException e) {
		break;
		}
		}
		}

		if (!eventLoopStarted) {
		mBluetoothService.disableNative();
		return false;
		}

		// get BluetoothService ready
		if (!mBluetoothService.prepareBluetooth()) {
		mEventLoop.stop();
		mBluetoothService.disableNative();
		return false;
		}

		return true;
		}
		}

		/**
		* Turning on Bluetooth module's power, loading firmware, starting
		* event loop thread to listen on Bluetooth module event changes.
		*/
		private class WarmUp extends State {

		@Override
		public void enter() {
		if (DBG) log("Enter WarmUp");
		}

		@Override
		public boolean processMessage(Message message) {
		if (DBG) log("WarmUp process message: " + message.what);

		boolean retValue = HANDLED;
		switch(message.what) {
		case SERVICE_RECORD_LOADED:
		transitionTo(mHotOff);
		break;
		case USER_TURN_ON: // handle this at HotOff state
		case TURN_ON_CONTINUE: // Once in HotOff state, continue turn bluetooth
		// on to the BluetoothOn state
		case AIRPLANE_MODE_ON:
		case AIRPLANE_MODE_OFF:
		deferMessage(message);
		break;
		case USER_TURN_OFF: // ignore
		break;
		default:
		return NOT_HANDLED;
		}
		return retValue;
		}

		}

		/**
		* Bluetooth Module has powered, firmware loaded, event loop started,
		* SDP loaded, but the modules stays non-discoverable and
		* non-connectable.
		*/
		private class HotOff extends State {
		private boolean mPersistSwitchOn = false;

		@Override
		public void enter() {
		if (DBG) log("Enter HotOff: " + mPersistSwitchOn);
		mPersistSwitchOn = false;
		}

		@Override
		public boolean processMessage(Message message) {
		if (DBG) log("HotOff process message: " + message.what);

		boolean retValue = HANDLED;
		switch(message.what) {
		case USER_TURN_ON:
		if ((Boolean) message.obj) {
		mPersistSwitchOn = true;
		}
		// let it fall to TURN_ON_CONTINUE:
		case TURN_ON_CONTINUE:
		mBluetoothService.switchConnectable(true);
		transitionTo(mSwitching);
		broadcastState(BluetoothAdapter.STATE_TURNING_ON);
		break;
		case AIRPLANE_MODE_ON:
		case TURN_COLD:
		mBluetoothService.shutoffBluetooth();
		mEventLoop.stop();
		transitionTo(mPowerOff);
		// ASSERT no support of config_bluetooth_adapter_quick_switch
		broadcastState(BluetoothAdapter.STATE_OFF);
		break;
		case AIRPLANE_MODE_OFF:
		if (getBluetoothPersistedSetting()) {
		mBluetoothService.switchConnectable(true);
		transitionTo(mSwitching);
		broadcastState(BluetoothAdapter.STATE_TURNING_ON);
		}
		break;
		case USER_TURN_OFF: // ignore
		break;
		default:
		return NOT_HANDLED;
		}
		return retValue;
		}

		}

		private class Switching extends State {

		@Override
		public void enter() {
		int what = getCurrentMessage().what;
		if (DBG) log("Enter Switching: " + what);
		}
		@Override
		public boolean processMessage(Message message) {
		if (DBG) log("Switching process message: " + message.what);

		boolean retValue = HANDLED;
		switch(message.what) {
		case BECOME_PAIRABLE:
		if (mPowerOff.mPersistSwitchOn \|\| mHotOff.mPersistSwitchOn) {
		persistSwitchSetting(true);
		mPowerOff.mPersistSwitchOn = mHotOff.mPersistSwitchOn = false;
		}
		String[] propVal = {"Pairable", mBluetoothService.getProperty("Pairable")};
		mEventLoop.onPropertyChanged(propVal);

		// run bluetooth now that it's turned on
		mBluetoothService.runBluetooth();
		transitionTo(mBluetoothOn);
		broadcastState(BluetoothAdapter.STATE_ON);
		break;
		case BECOME_NON_PAIRABLE:
		if (mBluetoothService.getAdapterConnectionState() ==
		BluetoothAdapter.STATE_DISCONNECTED) {
		transitionTo(mHotOff);
		finishSwitchingOff();
		}
		break;
		case ALL_DEVICES_DISCONNECTED:
		if (mBluetoothService.getScanMode() == BluetoothAdapter.SCAN_MODE_NONE) {
		transitionTo(mHotOff);
		finishSwitchingOff();
		}
		break;
		case USER_TURN_ON:
		case AIRPLANE_MODE_OFF:
		case AIRPLANE_MODE_ON:
		case USER_TURN_OFF:
		deferMessage(message);
		break;
		default:
		return NOT_HANDLED;
		}
		return retValue;
		}

		private void finishSwitchingOff() {
		if (mBluetoothOn.mPersistBluetoothOff) {
		persistSwitchSetting(false);
		mBluetoothOn.mPersistBluetoothOff = false;
		}
		mBluetoothService.finishDisable();
		if (mContext.getResources().getBoolean
		(com.android.internal.R.bool.config_bluetooth_adapter_quick_switch)) {
		broadcastState(BluetoothAdapter.STATE_OFF);
		} else {
		deferMessage(obtainMessage(TURN_COLD));
		}
		}
		}

		private class BluetoothOn extends State {
		private boolean mPersistBluetoothOff = false;

		@Override
		public void enter() {
		if (DBG) log("Enter BluetoothOn: " + mPersistBluetoothOff);
		mPersistBluetoothOff = false;
		}
		@Override
		public boolean processMessage(Message message) {
		if (DBG) log("BluetoothOn process message: " + message.what);

		boolean retValue = HANDLED;
		switch(message.what) {
		case USER_TURN_OFF:
		if ((Boolean) message.obj) {
		mPersistBluetoothOff = true;
		}
		// let it fall through to AIRPLANE_MODE_ON
		case AIRPLANE_MODE_ON:
		transitionTo(mSwitching);
		broadcastState(BluetoothAdapter.STATE_TURNING_OFF);
		mBluetoothService.switchConnectable(false);
		mBluetoothService.disconnectDevices();
		// we turn all the way to PowerOff with AIRPLANE_MODE_ON
		if (message.what == AIRPLANE_MODE_ON) {
		deferMessage(obtainMessage(AIRPLANE_MODE_ON));
		}
		break;
		case AIRPLANE_MODE_OFF: // ignore
		case USER_TURN_ON: // ignore
		break;
		default:
		return NOT_HANDLED;
		}
		return retValue;
		}

		}

		/**
		* Return the public BluetoothAdapter state
		*/
		int getBluetoothAdapterState() {
		return mPublicState;
		}

		BluetoothEventLoop getBluetoothEventLoop() {
		return mEventLoop;
		}

		private void persistSwitchSetting(boolean setOn) {
		long origCallerIdentityToken = Binder.clearCallingIdentity();
		Settings.Secure.putInt(mContext.getContentResolver(),
		Settings.Secure.BLUETOOTH_ON,
		setOn ? 1 : 0);
		Binder.restoreCallingIdentity(origCallerIdentityToken);
		}

		private boolean getBluetoothPersistedSetting() {
		ContentResolver contentResolver = mContext.getContentResolver();
		return (Settings.Secure.getInt(contentResolver,
		Settings.Secure.BLUETOOTH_ON, 0) > 0);
		}

		private void broadcastState(int newState) {

		if (DBG) log("Bluetooth state " + mPublicState + " -> " + newState);
		if (mPublicState == newState) {
		return;
		}

		Intent intent = new Intent(BluetoothAdapter.ACTION_STATE_CHANGED);
		intent.putExtra(BluetoothAdapter.EXTRA_PREVIOUS_STATE, mPublicState);
		intent.putExtra(BluetoothAdapter.EXTRA_STATE, newState);
		intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
		mPublicState = newState;

		mContext.sendBroadcast(intent, BluetoothService.BLUETOOTH_PERM);
		}

		private void dump(PrintWriter pw) {
		IState currentState = getCurrentState();
		if (currentState == mPowerOff) {
		pw.println("Bluetooth OFF - power down\n");
		} else if (currentState == mWarmUp) {
		pw.println("Bluetooth OFF - warm up\n");
		} else if (currentState == mHotOff) {
		pw.println("Bluetooth OFF - hot but off\n");
		} else if (currentState == mSwitching) {
		pw.println("Bluetooth Switching\n");
		} else if (currentState == mBluetoothOn) {
		pw.println("Bluetooth ON\n");
		} else {
		pw.println("ERROR: Bluetooth UNKNOWN STATE ");
		}
		}

		private static void log(String msg) {
		Log.d(TAG, msg);
		}
		}

core/java/android/server/BluetoothEventLoop.java

+15 −3

Original line number	Diff line number	Diff line
		@@ -52,6 +52,7 @@ class BluetoothEventLoop {
		private final HashMap<String, Integer> mAuthorizationAgentRequestData;
		private final BluetoothService mBluetoothService;
		private final BluetoothAdapter mAdapter;
		private final BluetoothAdapterStateMachine mBluetoothState;
		private BluetoothA2dp mA2dp;
		private BluetoothInputDevice mInputDevice;
		private final Context mContext;
		@@ -107,9 +108,11 @@ class BluetoothEventLoop {
		private static native void classInitNative();

		/* package */ BluetoothEventLoop(Context context, BluetoothAdapter adapter,
		BluetoothService bluetoothService) {
		BluetoothService bluetoothService,
		BluetoothAdapterStateMachine bluetoothState) {
		mBluetoothService = bluetoothService;
		mContext = context;
		mBluetoothState = bluetoothState;
		mPasskeyAgentRequestData = new HashMap<String, Integer>();
		mAuthorizationAgentRequestData = new HashMap<String, Integer>();
		mAdapter = adapter;
		@@ -299,8 +302,8 @@ class BluetoothEventLoop {

		/**
		* Called by native code on a PropertyChanged signal from
		* org.bluez.Adapter. This method is also called from Java at
		* {@link BluetoothService.EnableThread#run()} to set the "Pairable"
		* org.bluez.Adapter. This method is also called from
		* {@link BluetoothAdapterStateMachine} to set the "Pairable"
		* property when Bluetooth is enabled.
		*
		* @param propValues a string array containing the key and one or more
		@@ -334,6 +337,15 @@ class BluetoothEventLoop {
		return;

		adapterProperties.setProperty(name, propValues[1]);

		if (name.equals("Pairable")) {
		if (pairable.equals("true")) {
		mBluetoothState.sendMessage(BluetoothAdapterStateMachine.BECOME_PAIRABLE);
		} else {
		mBluetoothState.sendMessage(BluetoothAdapterStateMachine.BECOME_NON_PAIRABLE);
		}
		}

		int mode = BluetoothService.bluezStringToScanMode(
		pairable.equals("true"),
		discoverable.equals("true"));

core/java/android/server/BluetoothService.java

+114 −190

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core/res/res/values/config.xml

+4 −0

Original line number	Diff line number	Diff line
		@@ -466,6 +466,10 @@
		speech -->
		<bool name="config_bluetooth_wide_band_speech">true</bool>

		<!-- Boolean indicating if current platform supports quick switch-on/off of
		Bluetooth Module -->
		<bool name="config_bluetooth_adapter_quick_switch">true</bool>

		<!-- The default data-use polling period. -->
		<integer name="config_datause_polling_period_sec">600</integer>