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("batteryinfo");
37        mBatteryStatService = sm->getService(name);
38    }
39}
40
41status_t BatteryService::noteStartSensor(int uid, int handle) {
42    Parcel data, reply;
43    data.writeInterfaceToken(DESCRIPTOR);
44    data.writeInt32(uid);
45    data.writeInt32(handle);
46    status_t err = mBatteryStatService->transact(
47            TRANSACTION_noteStartSensor, data, &reply, 0);
48    err = reply.readExceptionCode();
49    return err;
50}
51
52status_t BatteryService::noteStopSensor(int uid, int handle) {
53    Parcel data, reply;
54    data.writeInterfaceToken(DESCRIPTOR);
55    data.writeInt32(uid);
56    data.writeInt32(handle);
57    status_t err = mBatteryStatService->transact(
58            TRANSACTION_noteStopSensor, data, &reply, 0);
59    err = reply.readExceptionCode();
60    return err;
61}
62
63bool BatteryService::addSensor(uid_t uid, int handle) {
64    Mutex::Autolock _l(mActivationsLock);
65    Info key(uid, handle);
66    ssize_t index = mActivations.indexOf(key);
67    if (index < 0) {
68        index = mActivations.add(key);
69    }
70    Info& info(mActivations.editItemAt(index));
71    info.count++;
72    return info.count == 1;
73}
74
75bool BatteryService::removeSensor(uid_t uid, int handle) {
76    Mutex::Autolock _l(mActivationsLock);
77    ssize_t index = mActivations.indexOf(Info(uid, handle));
78    if (index < 0) return false;
79    Info& info(mActivations.editItemAt(index));
80    info.count--;
81    return info.count == 0;
82}
83
84
85void BatteryService::enableSensorImpl(uid_t uid, int handle) {
86    if (mBatteryStatService != 0) {
87        if (addSensor(uid, handle)) {
88            int64_t identity = IPCThreadState::self()->clearCallingIdentity();
89            noteStartSensor(uid, handle);
90            IPCThreadState::self()->restoreCallingIdentity(identity);
91        }
92    }
93}
94void BatteryService::disableSensorImpl(uid_t uid, int handle) {
95    if (mBatteryStatService != 0) {
96        if (removeSensor(uid, handle)) {
97            int64_t identity = IPCThreadState::self()->clearCallingIdentity();
98            noteStopSensor(uid, handle);
99            IPCThreadState::self()->restoreCallingIdentity(identity);
100        }
101    }
102}
103
104void BatteryService::cleanupImpl(uid_t uid) {
105    if (mBatteryStatService != 0) {
106        Mutex::Autolock _l(mActivationsLock);
107        int64_t identity = IPCThreadState::self()->clearCallingIdentity();
108        for (ssize_t i=0 ; i<mActivations.size() ; i++) {
109            const Info& info(mActivations[i]);
110            if (info.uid == uid) {
111                noteStopSensor(info.uid, info.handle);
112                mActivations.removeAt(i);
113                i--;
114            }
115        }
116        IPCThreadState::self()->restoreCallingIdentity(identity);
117    }
118}
119
120const String16 BatteryService::DESCRIPTOR("com.android.internal.app.IBatteryStats");
121
122ANDROID_SINGLETON_STATIC_INSTANCE(BatteryService)
123
124// ---------------------------------------------------------------------------
125}; // namespace android
126
127