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 #ifndef ANDROID_POWERHALCONTROLLER_H
18 #define ANDROID_POWERHALCONTROLLER_H
19 
20 #include <aidl/android/hardware/power/Boost.h>
21 #include <aidl/android/hardware/power/IPower.h>
22 #include <aidl/android/hardware/power/IPowerHintSession.h>
23 #include <aidl/android/hardware/power/Mode.h>
24 #include <android-base/thread_annotations.h>
25 #include <powermanager/PowerHalWrapper.h>
26 #include <powermanager/PowerHintSessionWrapper.h>
27 
28 namespace android {
29 
30 namespace power {
31 
32 // -------------------------------------------------------------------------------------------------
33 
34 // Connects to underlying Power HAL handles.
35 class HalConnector {
36 public:
37     HalConnector() = default;
38     virtual ~HalConnector() = default;
39 
40     virtual std::unique_ptr<HalWrapper> connect();
41     virtual void reset();
42     virtual int32_t getAidlVersion();
43 };
44 
45 // -------------------------------------------------------------------------------------------------
46 
47 // Controller for Power HAL handle.
48 // This relies on HalConnector to connect to the underlying Power HAL
49 // service and reconnects to it after each failed api call. This also ensures
50 // connecting to the service is thread-safe.
51 class PowerHalController : public HalWrapper {
52 public:
PowerHalController()53     PowerHalController() : PowerHalController(std::make_unique<HalConnector>()) {}
PowerHalController(std::unique_ptr<HalConnector> connector)54     explicit PowerHalController(std::unique_ptr<HalConnector> connector)
55           : mHalConnector(std::move(connector)) {}
56     virtual ~PowerHalController() = default;
57 
58     virtual void init();
59 
60     virtual HalResult<void> setBoost(aidl::android::hardware::power::Boost boost,
61                                      int32_t durationMs) override;
62     virtual HalResult<void> setMode(aidl::android::hardware::power::Mode mode,
63                                     bool enabled) override;
64     virtual HalResult<std::shared_ptr<PowerHintSessionWrapper>> createHintSession(
65             int32_t tgid, int32_t uid, const std::vector<int32_t>& threadIds,
66             int64_t durationNanos) override;
67     virtual HalResult<std::shared_ptr<PowerHintSessionWrapper>> createHintSessionWithConfig(
68             int32_t tgid, int32_t uid, const std::vector<int32_t>& threadIds, int64_t durationNanos,
69             aidl::android::hardware::power::SessionTag tag,
70             aidl::android::hardware::power::SessionConfig* config) override;
71     virtual HalResult<int64_t> getHintSessionPreferredRate() override;
72     virtual HalResult<aidl::android::hardware::power::ChannelConfig> getSessionChannel(
73             int tgid, int uid) override;
74     virtual HalResult<void> closeSessionChannel(int tgid, int uid) override;
75 
76 private:
77     std::mutex mConnectedHalMutex;
78     std::unique_ptr<HalConnector> mHalConnector;
79 
80     // Shared pointers to keep global pointer and allow local copies to be used in
81     // different threads
82     std::shared_ptr<HalWrapper> mConnectedHal GUARDED_BY(mConnectedHalMutex) = nullptr;
83     const std::shared_ptr<HalWrapper> mDefaultHal = std::make_shared<EmptyHalWrapper>();
84 
85     std::shared_ptr<HalWrapper> initHal();
86     template <typename T>
87     HalResult<T> processHalResult(HalResult<T>&& result, const char* functionName);
88 };
89 
90 // -------------------------------------------------------------------------------------------------
91 
92 }; // namespace power
93 
94 }; // namespace android
95 
96 #endif // ANDROID_POWERHALCONTROLLER_H
97