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 <sys/types.h>
19 
20 #include <batterystats/IBatteryStats.h>
21 #include <utils/Singleton.h>
22 #include <utils/SortedVector.h>
23 #include <utils/SystemClock.h>
24 
25 namespace android {
26 // ---------------------------------------------------------------------------
27 
28 class BatteryService : public Singleton<BatteryService> {
29     static constexpr int64_t WAKEUP_SENSOR_EVENT_DEBOUNCE_MS = 1000;
30 
31     friend class Singleton<BatteryService>;
32     sp<IBatteryStats> mBatteryStatService;
33 
34     BatteryService();
35 
36     void enableSensorImpl(uid_t uid, int handle);
37     void disableSensorImpl(uid_t uid, int handle);
38     void noteWakeupSensorEventImpl(int64_t elapsedNanos, uid_t uid, int handle);
39 
40     struct Info {
41         uid_t uid;
42         int handle;
43         int32_t count;
InfoInfo44         Info()  : uid(0), handle(0), count(0) { }
InfoInfo45         Info(uid_t uid, int handle) : uid(uid), handle(handle), count(0) { }
46         bool operator < (const Info& rhs) const {
47             return (uid == rhs.uid) ? (handle < rhs.handle) :  (uid < rhs.uid);
48         }
49     };
50 
51     int64_t mLastWakeupSensorEventReportedMs;
52     Mutex mActivationsLock;
53     SortedVector<Info> mActivations;
54     bool addSensor(uid_t uid, int handle);
55     bool removeSensor(uid_t uid, int handle);
56     bool checkService();
57 
58 public:
enableSensor(uid_t uid,int handle)59     static void enableSensor(uid_t uid, int handle) {
60         BatteryService::getInstance().enableSensorImpl(uid, handle);
61     }
disableSensor(uid_t uid,int handle)62     static void disableSensor(uid_t uid, int handle) {
63         BatteryService::getInstance().disableSensorImpl(uid, handle);
64     }
noteWakeupSensorEvent(int64_t elapsed,uid_t uid,int handle)65     static void noteWakeupSensorEvent(int64_t elapsed, uid_t uid, int handle) {
66         BatteryService& instance = BatteryService::getInstance();
67         const int64_t nowElapsedMs = elapsedRealtime();
68         if (nowElapsedMs >= (instance.mLastWakeupSensorEventReportedMs
69                               + WAKEUP_SENSOR_EVENT_DEBOUNCE_MS)) {
70             instance.noteWakeupSensorEventImpl(elapsed, uid, handle);
71             instance.mLastWakeupSensorEventReportedMs = nowElapsedMs;
72         }
73     }
74 };
75 
76 // ---------------------------------------------------------------------------
77 }; // namespace android
78 
79