Wei Jia | 53692fa | 2017-12-11 10:33:46 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2017 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 "JWakeLock" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include "JWakeLock.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 | //TODO: use JAVA PowerManager, instead of binder |
| 32 | JWakeLock::JWakeLock() : |
| 33 | mPowerManager(NULL), |
| 34 | mWakeLockToken(NULL), |
| 35 | mWakeLockCount(0), |
| 36 | mDeathRecipient(new PMDeathRecipient(this)) {} |
| 37 | |
| 38 | JWakeLock::~JWakeLock() { |
| 39 | if (mPowerManager != NULL) { |
| 40 | sp<IBinder> binder = IInterface::asBinder(mPowerManager); |
| 41 | binder->unlinkToDeath(mDeathRecipient); |
| 42 | } |
| 43 | clearPowerManager(); |
| 44 | } |
| 45 | |
| 46 | bool JWakeLock::acquire() { |
| 47 | if (mWakeLockCount == 0) { |
| 48 | CHECK(mWakeLockToken == NULL); |
| 49 | if (mPowerManager == NULL) { |
| 50 | // use checkService() to avoid blocking if power service is not up yet |
| 51 | sp<IBinder> binder = |
| 52 | defaultServiceManager()->checkService(String16("power")); |
| 53 | if (binder == NULL) { |
| 54 | ALOGW("could not get the power manager service"); |
| 55 | } else { |
| 56 | mPowerManager = interface_cast<IPowerManager>(binder); |
| 57 | binder->linkToDeath(mDeathRecipient); |
| 58 | } |
| 59 | } |
| 60 | if (mPowerManager != NULL) { |
| 61 | sp<IBinder> binder = new BBinder(); |
| 62 | int64_t token = IPCThreadState::self()->clearCallingIdentity(); |
| 63 | status_t status = mPowerManager->acquireWakeLock( |
| 64 | POWERMANAGER_PARTIAL_WAKE_LOCK, |
| 65 | binder, String16("JWakeLock"), String16("media")); |
| 66 | IPCThreadState::self()->restoreCallingIdentity(token); |
| 67 | if (status == NO_ERROR) { |
| 68 | mWakeLockToken = binder; |
| 69 | mWakeLockCount++; |
| 70 | return true; |
| 71 | } |
| 72 | } |
| 73 | } else { |
| 74 | mWakeLockCount++; |
| 75 | return true; |
| 76 | } |
| 77 | return false; |
| 78 | } |
| 79 | |
| 80 | void JWakeLock::release(bool force) { |
| 81 | if (mWakeLockCount == 0) { |
| 82 | return; |
| 83 | } |
| 84 | if (force) { |
| 85 | // Force wakelock release below by setting reference count to 1. |
| 86 | mWakeLockCount = 1; |
| 87 | } |
| 88 | if (--mWakeLockCount == 0) { |
| 89 | CHECK(mWakeLockToken != NULL); |
| 90 | if (mPowerManager != NULL) { |
| 91 | int64_t token = IPCThreadState::self()->clearCallingIdentity(); |
| 92 | mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */); |
| 93 | IPCThreadState::self()->restoreCallingIdentity(token); |
| 94 | } |
| 95 | mWakeLockToken.clear(); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | void JWakeLock::clearPowerManager() { |
| 100 | release(true); |
| 101 | mPowerManager.clear(); |
| 102 | } |
| 103 | |
| 104 | void JWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) { |
| 105 | if (mWakeLock != NULL) { |
| 106 | mWakeLock->clearPowerManager(); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | } // namespace android |