1 /*
2  * Copyright (C) 2018 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 <condition_variable>
20 #include <memory>
21 #include <mutex>
22 #include <string>
23 #include <thread>
24 
25 namespace aidl {
26 namespace google {
27 namespace hardware {
28 namespace power {
29 namespace impl {
30 namespace pixel {
31 
32 enum InteractionState {
33     INTERACTION_STATE_UNINITIALIZED,
34     INTERACTION_STATE_IDLE,
35     INTERACTION_STATE_INTERACTION,
36     INTERACTION_STATE_WAITING,
37 };
38 
39 class InteractionHandler {
40   public:
41     InteractionHandler();
42     ~InteractionHandler();
43     bool Init();
44     void Exit();
45     void Acquire(int32_t duration);
46 
47   private:
48     void Release();
49     void WaitForIdle(int32_t wait_ms, int32_t timeout_ms);
50     void AbortWaitLocked();
51     void Routine();
52 
53     void PerfLock();
54     void PerfRel();
55 
56     enum InteractionState mState;
57     int mIdleFd;
58     int mEventFd;
59     int32_t mDurationMs;
60     struct timespec mLastTimespec;
61     std::unique_ptr<std::thread> mThread;
62     std::mutex mLock;
63     std::condition_variable mCond;
64 };
65 
66 }  // namespace pixel
67 }  // namespace impl
68 }  // namespace power
69 }  // namespace hardware
70 }  // namespace google
71 }  // namespace aidl
72