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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "AWakeLock"
     19 #include <utils/Log.h>
     20 
     21 #include "AWakeLock.h"
     22 
     23 #include <binder/IPCThreadState.h>
     24 #include <binder/IServiceManager.h>
     25 #include <media/stagefright/foundation/ADebug.h>
     26 #include <powermanager/PowerManager.h>
     27 
     28 
     29 namespace android {
     30 
     31 AWakeLock::AWakeLock() :
     32     mPowerManager(NULL),
     33     mWakeLockToken(NULL),
     34     mWakeLockCount(0),
     35     mDeathRecipient(new PMDeathRecipient(this)) {}
     36 
     37 AWakeLock::~AWakeLock() {
     38     if (mPowerManager != NULL) {
     39         sp<IBinder> binder = IInterface::asBinder(mPowerManager);
     40         binder->unlinkToDeath(mDeathRecipient);
     41     }
     42     clearPowerManager();
     43 }
     44 
     45 bool AWakeLock::acquire() {
     46     if (mWakeLockCount == 0) {
     47         CHECK(mWakeLockToken == NULL);
     48         if (mPowerManager == NULL) {
     49             // use checkService() to avoid blocking if power service is not up yet
     50             sp<IBinder> binder =
     51                 defaultServiceManager()->checkService(String16("power"));
     52             if (binder == NULL) {
     53                 ALOGW("could not get the power manager service");
     54             } else {
     55                 mPowerManager = interface_cast<IPowerManager>(binder);
     56                 binder->linkToDeath(mDeathRecipient);
     57             }
     58         }
     59         if (mPowerManager != NULL) {
     60             sp<IBinder> binder = new BBinder();
     61             int64_t token = IPCThreadState::self()->clearCallingIdentity();
     62             status_t status = mPowerManager->acquireWakeLock(
     63                     POWERMANAGER_PARTIAL_WAKE_LOCK,
     64                     binder, String16("AWakeLock"), String16("media"));
     65             IPCThreadState::self()->restoreCallingIdentity(token);
     66             if (status == NO_ERROR) {
     67                 mWakeLockToken = binder;
     68                 mWakeLockCount++;
     69                 return true;
     70             }
     71         }
     72     } else {
     73         mWakeLockCount++;
     74         return true;
     75     }
     76     return false;
     77 }
     78 
     79 void AWakeLock::release(bool force) {
     80     if (mWakeLockCount == 0) {
     81         return;
     82     }
     83     if (force) {
     84         // Force wakelock release below by setting reference count to 1.
     85         mWakeLockCount = 1;
     86     }
     87     if (--mWakeLockCount == 0) {
     88         CHECK(mWakeLockToken != NULL);
     89         if (mPowerManager != NULL) {
     90             int64_t token = IPCThreadState::self()->clearCallingIdentity();
     91             mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */);
     92             IPCThreadState::self()->restoreCallingIdentity(token);
     93         }
     94         mWakeLockToken.clear();
     95     }
     96 }
     97 
     98 void AWakeLock::clearPowerManager() {
     99     release(true);
    100     mPowerManager.clear();
    101 }
    102 
    103 void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) {
    104     if (mWakeLock != NULL) {
    105         mWakeLock->clearPowerManager();
    106     }
    107 }
    108 
    109 }  // namespace android
    110