1 /*
2 * Copyright (C) 2012 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 #include <stdint.h>
18 #include <math.h>
19 #include <sys/types.h>
20
21 #include <cutils/atomic.h>
22 #include <utils/Errors.h>
23 #include <utils/Singleton.h>
24
25 #include <binder/BinderService.h>
26 #include <binder/Parcel.h>
27
28 #include "BatteryService.h"
29
30 namespace android {
31 // ---------------------------------------------------------------------------
32
BatteryService()33 BatteryService::BatteryService() : mBatteryStatService(nullptr) {
34 }
35
addSensor(uid_t uid,int handle)36 bool BatteryService::addSensor(uid_t uid, int handle) {
37 Mutex::Autolock _l(mActivationsLock);
38 Info key(uid, handle);
39 ssize_t index = mActivations.indexOf(key);
40 if (index < 0) {
41 index = mActivations.add(key);
42 }
43 Info& info(mActivations.editItemAt(index));
44 info.count++;
45 return info.count == 1;
46 }
47
removeSensor(uid_t uid,int handle)48 bool BatteryService::removeSensor(uid_t uid, int handle) {
49 Mutex::Autolock _l(mActivationsLock);
50 ssize_t index = mActivations.indexOf(Info(uid, handle));
51 if (index < 0) return false;
52 Info& info(mActivations.editItemAt(index));
53 info.count--;
54 return info.count == 0;
55 }
56
57
enableSensorImpl(uid_t uid,int handle)58 void BatteryService::enableSensorImpl(uid_t uid, int handle) {
59 if (checkService()) {
60 if (addSensor(uid, handle)) {
61 int64_t identity = IPCThreadState::self()->clearCallingIdentity();
62 mBatteryStatService->noteStartSensor(uid, handle);
63 IPCThreadState::self()->restoreCallingIdentity(identity);
64 }
65 }
66 }
disableSensorImpl(uid_t uid,int handle)67 void BatteryService::disableSensorImpl(uid_t uid, int handle) {
68 if (checkService()) {
69 if (removeSensor(uid, handle)) {
70 int64_t identity = IPCThreadState::self()->clearCallingIdentity();
71 mBatteryStatService->noteStopSensor(uid, handle);
72 IPCThreadState::self()->restoreCallingIdentity(identity);
73 }
74 }
75 }
76
cleanupImpl(uid_t uid)77 void BatteryService::cleanupImpl(uid_t uid) {
78 if (checkService()) {
79 Mutex::Autolock _l(mActivationsLock);
80 int64_t identity = IPCThreadState::self()->clearCallingIdentity();
81 for (size_t i=0 ; i<mActivations.size() ; ) {
82 const Info& info(mActivations[i]);
83 if (info.uid == uid) {
84 mBatteryStatService->noteStopSensor(info.uid, info.handle);
85 mActivations.removeAt(i);
86 } else {
87 i++;
88 }
89 }
90 IPCThreadState::self()->restoreCallingIdentity(identity);
91 }
92 }
93
checkService()94 bool BatteryService::checkService() {
95 if (mBatteryStatService == nullptr) {
96 const sp<IServiceManager> sm(defaultServiceManager());
97 if (sm != nullptr) {
98 const String16 name("batterystats");
99 mBatteryStatService = interface_cast<IBatteryStats>(sm->getService(name));
100 }
101 }
102 return mBatteryStatService != nullptr;
103 }
104
105 ANDROID_SINGLETON_STATIC_INSTANCE(BatteryService)
106
107 // ---------------------------------------------------------------------------
108 }; // namespace android
109