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
AWakeLock()31 AWakeLock::AWakeLock() :
32 mPowerManager(NULL),
33 mWakeLockToken(NULL),
34 mWakeLockCount(0),
35 mDeathRecipient(new PMDeathRecipient(this)) {}
36
~AWakeLock()37 AWakeLock::~AWakeLock() {
38 if (mPowerManager != NULL) {
39 sp<IBinder> binder = IInterface::asBinder(mPowerManager);
40 binder->unlinkToDeath(mDeathRecipient);
41 }
42 clearPowerManager();
43 }
44
acquire()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
release(bool force)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
clearPowerManager()98 void AWakeLock::clearPowerManager() {
99 release(true);
100 mPowerManager.clear();
101 }
102
binderDied(const wp<IBinder> & who __unused)103 void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) {
104 if (mWakeLock != NULL) {
105 mWakeLock->clearPowerManager();
106 }
107 }
108
109 } // namespace android
110