1 /*
2  * Copyright (C) 2020 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 #pragma once
18 
19 #include <PowerStatsAidl.h>
20 
21 #include <unordered_map>
22 
23 namespace aidl {
24 namespace android {
25 namespace hardware {
26 namespace power {
27 namespace stats {
28 
29 class IioEnergyMeterDataProvider : public PowerStats::IEnergyMeterDataProvider {
30   public:
31     IioEnergyMeterDataProvider(const std::vector<const std::string> &deviceNames,
32                                const bool useSelector = false);
33 
34     // Methods from PowerStats::IRailEnergyDataProvider
35     ndk::ScopedAStatus readEnergyMeter(const std::vector<int32_t> &in_channelIds,
36                                        std::vector<EnergyMeasurement> *_aidl_return) override;
37     ndk::ScopedAStatus getEnergyMeterInfo(std::vector<Channel> *_aidl_return) override;
38 
39   private:
40     void findIioEnergyMeterNodes();
41     void parseEnabledRails();
42     int parseEnergyValue(std::string path);
43     int parseEnergyContents(const std::string &contents);
44 
45     std::mutex mLock;
46     std::unordered_map<std::string, std::string> mDevicePaths;  // key: path, value: device name
47     std::unordered_map<std::string, int32_t> mChannelIds;  // key: name, value: id
48     std::vector<Channel> mChannelInfos;
49     std::vector<EnergyMeasurement> mReading;
50 
51     const std::vector<const std::string> kDeviceNames;
52     const std::string kDeviceType = "iio:device";
53     const std::string kIioRootDir = "/sys/bus/iio/devices/";
54     const std::string kNameNode = "/name";
55     const std::string kEnabledRailsNode = "/enabled_rails";
56     const std::string kEnergyValueNode = "/energy_value";
57 };
58 
59 }  // namespace stats
60 }  // namespace power
61 }  // namespace hardware
62 }  // namespace android
63 }  // namespace aidl
64