/*
* Copyright (C) 2008 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;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.IVibratorService;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.Binder;
import android.os.SystemClock;
import android.os.WorkSource;
import android.util.Slog;
import java.util.LinkedList;
import java.util.ListIterator;
public class VibratorService extends IVibratorService.Stub {
private static final String TAG = "VibratorService";
private final LinkedList<Vibration> mVibrations;
private Vibration mCurrentVibration;
private final WorkSource mTmpWorkSource = new WorkSource();
private class Vibration implements IBinder.DeathRecipient {
private final IBinder mToken;
private final long mTimeout;
private final long mStartTime;
private final long[] mPattern;
private final int mRepeat;
private final int mUid;
Vibration(IBinder token, long millis, int uid) {
this(token, millis, null, 0, uid);
}
Vibration(IBinder token, long[] pattern, int repeat, int uid) {
this(token, 0, pattern, repeat, uid);
}
private Vibration(IBinder token, long millis, long[] pattern,
int repeat, int uid) {
mToken = token;
mTimeout = millis;
mStartTime = SystemClock.uptimeMillis();
mPattern = pattern;
mRepeat = repeat;
mUid = uid;
}
public void binderDied() {
synchronized (mVibrations) {
mVibrations.remove(this);
if (this == mCurrentVibration) {
doCancelVibrateLocked();
startNextVibrationLocked();
}
}
}
public boolean hasLongerTimeout(long millis) {
if (mTimeout == 0) {
// This is a pattern, return false to play the simple
// vibration.
return false;
}
if ((mStartTime + mTimeout)
< (SystemClock.uptimeMillis() + millis)) {
// If this vibration will end before the time passed in, let
// the new vibration play.
return false;
}
return true;
}
}
VibratorService(Context context) {
// Reset the hardware to a default state, in case this is a runtime
// restart instead of a fresh boot.
vibratorOff();
mContext = context;
PowerManager pm = (PowerManager)context.getSystemService(
Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*vibrator*");
mWakeLock.setReferenceCounted(true);
mVibrations = new LinkedList<Vibration>();
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_OFF);
context.registerReceiver(mIntentReceiver, filter);
}
public boolean hasVibrator() {
return vibratorExists();
}
public void vibrate(long milliseconds, IBinder token) {
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.VIBRATE)
!= PackageManager.PERMISSION_GRANTED) {
throw new SecurityException("Requires VIBRATE permission");
}
int uid = Binder.getCallingUid();
// We're running in the system server so we cannot crash. Check for a
// timeout of 0 or negative. This will ensure that a vibration has
// either a timeout of > 0 or a non-null pattern.
if (milliseconds <= 0 || (mCurrentVibration != null
&& mCurrentVibration.hasLongerTimeout(milliseconds))) {
// Ignore this vibration since the current vibration will play for
// longer than milliseconds.
return;
}
Vibration vib = new Vibration(token, milliseconds, uid);
synchronized (mVibrations) {
removeVibrationLocked(token);
doCancelVibrateLocked();
mCurrentVibration = vib;
startVibrationLocked(vib);
}
}
private boolean isAll0(long[] pattern) {
int N = pattern.length;
for (int i = 0; i < N; i++) {
if (pattern[i] != 0) {
return false;
}
}
return true;
}
public void vibratePattern(long[] pattern, int repeat, IBinder token) {
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.VIBRATE)
!= PackageManager.PERMISSION_GRANTED) {
throw new SecurityException("Requires VIBRATE permission");
}
int uid = Binder.getCallingUid();
// so wakelock calls will succeed
long identity = Binder.clearCallingIdentity();
try {
if (false) {
String s = "";
int N = pattern.length;
for (int i=0; i<N; i++) {
s += " " + pattern[i];
}
Slog.i(TAG, "vibrating with pattern: " + s);
}
// we're running in the server so we can't fail
if (pattern == null || pattern.length == 0
|| isAll0(pattern)
|| repeat >= pattern.length || token == null) {
return;
}
Vibration vib = new Vibration(token, pattern, repeat, uid);
try {
token.linkToDeath(vib, 0);
} catch (RemoteException e) {
return;
}
synchronized (mVibrations) {
removeVibrationLocked(token);
doCancelVibrateLocked();
if (repeat >= 0) {
mVibrations.addFirst(vib);
startNextVibrationLocked();
} else {
// A negative repeat means that this pattern is not meant
// to repeat. Treat it like a simple vibration.
mCurrentVibration = vib;
startVibrationLocked(vib);
}
}
}
finally {
Binder.restoreCallingIdentity(identity);
}
}
public void cancelVibrate(IBinder token) {
mContext.enforceCallingOrSelfPermission(
android.Manifest.permission.VIBRATE,
"cancelVibrate");
// so wakelock calls will succeed
long identity = Binder.clearCallingIdentity();
try {
synchronized (mVibrations) {
final Vibration vib = removeVibrationLocked(token);
if (vib == mCurrentVibration) {
doCancelVibrateLocked();
startNextVibrationLocked();
}
}
}
finally {
Binder.restoreCallingIdentity(identity);
}
}
private final Runnable mVibrationRunnable = new Runnable() {
public void run() {
synchronized (mVibrations) {
doCancelVibrateLocked();
startNextVibrationLocked();
}
}
};
// Lock held on mVibrations
private void doCancelVibrateLocked() {
if (mThread != null) {
synchronized (mThread) {
mThread.mDone = true;
mThread.notify();
}
mThread = null;
}
vibratorOff();
mH.removeCallbacks(mVibrationRunnable);
}
// Lock held on mVibrations
private void startNextVibrationLocked() {
if (mVibrations.size() <= 0) {
mCurrentVibration = null;
return;
}
mCurrentVibration = mVibrations.getFirst();
startVibrationLocked(mCurrentVibration);
}
// Lock held on mVibrations
private void startVibrationLocked(final Vibration vib) {
if (vib.mTimeout != 0) {
vibratorOn(vib.mTimeout);
mH.postDelayed(mVibrationRunnable, vib.mTimeout);
} else {
// mThread better be null here. doCancelVibrate should always be
// called before startNextVibrationLocked or startVibrationLocked.
mThread = new VibrateThread(vib);
mThread.start();
}
}
// Lock held on mVibrations
private Vibration removeVibrationLocked(IBinder token) {
ListIterator<Vibration> iter = mVibrations.listIterator(0);
while (iter.hasNext()) {
Vibration vib = iter.next();
if (vib.mToken == token) {
iter.remove();
unlinkVibration(vib);
return vib;
}
}
// We might be looking for a simple vibration which is only stored in
// mCurrentVibration.
if (mCurrentVibration != null && mCurrentVibration.mToken == token) {
unlinkVibration(mCurrentVibration);
return mCurrentVibration;
}
return null;
}
private void unlinkVibration(Vibration vib) {
if (vib.mPattern != null) {
// If Vibration object has a pattern,
// the Vibration object has also been linkedToDeath.
vib.mToken.unlinkToDeath(vib, 0);
}
}
private class VibrateThread extends Thread {
final Vibration mVibration;
boolean mDone;
VibrateThread(Vibration vib) {
mVibration = vib;
mTmpWorkSource.set(vib.mUid);
mWakeLock.setWorkSource(mTmpWorkSource);
mWakeLock.acquire();
}
private void delay(long duration) {
if (duration > 0) {
long bedtime = SystemClock.uptimeMillis();
do {
try {
this.wait(duration);
}
catch (InterruptedException e) {
}
if (mDone) {
break;
}
duration = duration
- SystemClock.uptimeMillis() - bedtime;
} while (duration > 0);
}
}
public void run() {
Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_DISPLAY);
synchronized (this) {
int index = 0;
long[] pattern = mVibration.mPattern;
int len = pattern.length;
int repeat = mVibration.mRepeat;
long duration = 0;
while (!mDone) {
// add off-time duration to any accumulated on-time duration
if (index < len) {
duration += pattern[index++];
}
// sleep until it is time to start the vibrator
delay(duration);
if (mDone) {
break;
}
if (index < len) {
// read on-time duration and start the vibrator
// duration is saved for delay() at top of loop
duration = pattern[index++];
if (duration > 0) {
VibratorService.this.vibratorOn(duration);
}
} else {
if (repeat < 0) {
break;
} else {
index = repeat;
duration = 0;
}
}
}
mWakeLock.release();
}
synchronized (mVibrations) {
if (mThread == this) {
mThread = null;
}
if (!mDone) {
// If this vibration finished naturally, start the next
// vibration.
mVibrations.remove(mVibration);
unlinkVibration(mVibration);
startNextVibrationLocked();
}
}
}
};
BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
synchronized (mVibrations) {
doCancelVibrateLocked();
int size = mVibrations.size();
for(int i = 0; i < size; i++) {
unlinkVibration(mVibrations.get(i));
}
mVibrations.clear();
}
}
}
};
private Handler mH = new Handler();
private final Context mContext;
private final PowerManager.WakeLock mWakeLock;
volatile VibrateThread mThread;
native static boolean vibratorExists();
native static void vibratorOn(long milliseconds);
native static void vibratorOff();
}