BatteryService.cpp revision 63ff1c644f785c78adbf65b9abf6b998cee2c7a1 
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 <utils/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
30namespace android {
31// ---------------------------------------------------------------------------
32
33BatteryService::BatteryService() {
34    const sp<IServiceManager> sm(defaultServiceManager());
35    if (sm != NULL) {
36        const String16 name("batterystats");
37        mBatteryStatService = interface_cast<IBatteryStats>(sm->getService(name));
38    }
39}
40
41bool BatteryService::addSensor(uid_t uid, int handle) {
42    Mutex::Autolock _l(mActivationsLock);
43    Info key(uid, handle);
44    ssize_t index = mActivations.indexOf(key);
45    if (index < 0) {
46        index = mActivations.add(key);
47    }
48    Info& info(mActivations.editItemAt(index));
49    info.count++;
50    return info.count == 1;
51}
52
53bool BatteryService::removeSensor(uid_t uid, int handle) {
54    Mutex::Autolock _l(mActivationsLock);
55    ssize_t index = mActivations.indexOf(Info(uid, handle));
56    if (index < 0) return false;
57    Info& info(mActivations.editItemAt(index));
58    info.count--;
59    return info.count == 0;
60}
61
62
63void BatteryService::enableSensorImpl(uid_t uid, int handle) {
64    if (mBatteryStatService != 0) {
65        if (addSensor(uid, handle)) {
66            int64_t identity = IPCThreadState::self()->clearCallingIdentity();
67            mBatteryStatService->noteStartSensor(uid, handle);
68            IPCThreadState::self()->restoreCallingIdentity(identity);
69        }
70    }
71}
72void BatteryService::disableSensorImpl(uid_t uid, int handle) {
73    if (mBatteryStatService != 0) {
74        if (removeSensor(uid, handle)) {
75            int64_t identity = IPCThreadState::self()->clearCallingIdentity();
76            mBatteryStatService->noteStopSensor(uid, handle);
77            IPCThreadState::self()->restoreCallingIdentity(identity);
78        }
79    }
80}
81
82void BatteryService::cleanupImpl(uid_t uid) {
83    if (mBatteryStatService != 0) {
84        Mutex::Autolock _l(mActivationsLock);
85        int64_t identity = IPCThreadState::self()->clearCallingIdentity();
86        for (ssize_t i=0 ; i<mActivations.size() ; i++) {
87            const Info& info(mActivations[i]);
88            if (info.uid == uid) {
89                mBatteryStatService->noteStopSensor(info.uid, info.handle);
90                mActivations.removeAt(i);
91                i--;
92            }
93        }
94        IPCThreadState::self()->restoreCallingIdentity(identity);
95    }
96}
97
98ANDROID_SINGLETON_STATIC_INSTANCE(BatteryService)
99
100// ---------------------------------------------------------------------------
101}; // namespace android
102
103