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111 lines
3.4 KiB
111 lines
3.4 KiB
7 months ago
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "AWakeLock"
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#include <utils/Log.h>
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#include "AWakeLock.h"
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#include <binder/IPCThreadState.h>
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#include <binder/IServiceManager.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <powermanager/PowerManager.h>
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namespace android {
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AWakeLock::AWakeLock() :
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mPowerManager(NULL),
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mWakeLockToken(NULL),
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mWakeLockCount(0),
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mDeathRecipient(new PMDeathRecipient(this)) {}
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AWakeLock::~AWakeLock() {
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if (mPowerManager != NULL) {
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sp<IBinder> binder = IInterface::asBinder(mPowerManager);
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binder->unlinkToDeath(mDeathRecipient);
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}
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clearPowerManager();
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}
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bool AWakeLock::acquire() {
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if (mWakeLockCount == 0) {
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CHECK(mWakeLockToken == NULL);
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if (mPowerManager == NULL) {
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// use checkService() to avoid blocking if power service is not up yet
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sp<IBinder> binder =
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defaultServiceManager()->checkService(String16("power"));
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if (binder == NULL) {
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ALOGW("could not get the power manager service");
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} else {
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mPowerManager = interface_cast<os::IPowerManager>(binder);
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binder->linkToDeath(mDeathRecipient);
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}
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}
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if (mPowerManager != NULL) {
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sp<IBinder> binder = new BBinder();
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int64_t token = IPCThreadState::self()->clearCallingIdentity();
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binder::Status status = mPowerManager->acquireWakeLock(
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binder, POWERMANAGER_PARTIAL_WAKE_LOCK,
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String16("AWakeLock"), String16("media"),
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{} /* workSource */, {} /* historyTag */, -1 /* displayId */);
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IPCThreadState::self()->restoreCallingIdentity(token);
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if (status.isOk()) {
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mWakeLockToken = binder;
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mWakeLockCount++;
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return true;
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}
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}
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} else {
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mWakeLockCount++;
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return true;
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}
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return false;
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}
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void AWakeLock::release(bool force) {
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if (mWakeLockCount == 0) {
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return;
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}
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if (force) {
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// Force wakelock release below by setting reference count to 1.
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mWakeLockCount = 1;
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}
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if (--mWakeLockCount == 0) {
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CHECK(mWakeLockToken != NULL);
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if (mPowerManager != NULL) {
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int64_t token = IPCThreadState::self()->clearCallingIdentity();
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mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */);
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IPCThreadState::self()->restoreCallingIdentity(token);
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}
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mWakeLockToken.clear();
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}
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}
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void AWakeLock::clearPowerManager() {
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release(true);
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mPowerManager.clear();
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}
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void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) {
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if (mWakeLock != NULL) {
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mWakeLock->clearPowerManager();
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}
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}
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} // namespace android
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