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/*
* Copyright (C) 2015 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.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "AWakeLock"
#include <utils/Log.h>
#include "ADebug.h"
#include "AWakeLock.h"
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <powermanager/PowerManager.h>
namespace android {
AWakeLock::AWakeLock() :
mPowerManager(NULL),
mWakeLockToken(NULL),
mWakeLockCount(0),
mDeathRecipient(new PMDeathRecipient(this)) {}
AWakeLock::~AWakeLock() {
if (mPowerManager != NULL) {
sp<IBinder> binder = IInterface::asBinder(mPowerManager);
binder->unlinkToDeath(mDeathRecipient);
}
clearPowerManager();
}
bool AWakeLock::acquire() {
if (mWakeLockCount == 0) {
CHECK(mWakeLockToken == NULL);
if (mPowerManager == NULL) {
// use checkService() to avoid blocking if power service is not up yet
sp<IBinder> binder =
defaultServiceManager()->checkService(String16("power"));
if (binder == NULL) {
ALOGW("could not get the power manager service");
} else {
mPowerManager = interface_cast<IPowerManager>(binder);
binder->linkToDeath(mDeathRecipient);
}
}
if (mPowerManager != NULL) {
sp<IBinder> binder = new BBinder();
int64_t token = IPCThreadState::self()->clearCallingIdentity();
status_t status = mPowerManager->acquireWakeLock(
POWERMANAGER_PARTIAL_WAKE_LOCK,
binder, String16("AWakeLock"), String16("media"));
IPCThreadState::self()->restoreCallingIdentity(token);
if (status == NO_ERROR) {
mWakeLockToken = binder;
mWakeLockCount++;
return true;
}
}
} else {
mWakeLockCount++;
return true;
}
return false;
}
void AWakeLock::release(bool force) {
if (mWakeLockCount == 0) {
return;
}
if (force) {
// Force wakelock release below by setting reference count to 1.
mWakeLockCount = 1;
}
if (--mWakeLockCount == 0) {
CHECK(mWakeLockToken != NULL);
if (mPowerManager != NULL) {
int64_t token = IPCThreadState::self()->clearCallingIdentity();
mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */);
IPCThreadState::self()->restoreCallingIdentity(token);
}
mWakeLockToken.clear();
}
}
void AWakeLock::clearPowerManager() {
release(true);
mPowerManager.clear();
}
void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) {
if (mWakeLock != NULL) {
mWakeLock->clearPowerManager();
}
}
} // namespace android
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