1 /* 2 * Copyright (c) 2021, 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 CPP_POWERPOLICY_SERVER_SRC_SILENTMODEHANDLER_H_ 18 #define CPP_POWERPOLICY_SERVER_SRC_SILENTMODEHANDLER_H_ 19 20 #include <android-base/result.h> 21 #include <android-base/unique_fd.h> 22 #include <utils/Mutex.h> 23 #include <utils/String16.h> 24 #include <utils/Vector.h> 25 26 #include <atomic> 27 #include <thread> // NOLINT(build/c++11) 28 29 namespace android { 30 namespace frameworks { 31 namespace automotive { 32 namespace powerpolicy { 33 34 inline constexpr const char* kBootReasonForcedNonSilent = "reboot,forcednonsilent"; 35 inline constexpr const char* kBootReasonForcedSilent = "reboot,forcedsilent"; 36 inline constexpr const char* kValueNonSilentMode = "0"; 37 inline constexpr const char* kValueSilentMode = "1"; 38 39 class ISilentModeChangeHandler; 40 41 // Forward declaration for testing use only. 42 namespace internal { 43 44 class SilentModeHandlerPeer; 45 46 } // namespace internal 47 48 /** 49 * SilentModeHandler monitors {@code /sys/power/pm_silentmode_hw_state} in sysfs to detect Silent 50 * Mode change by a vehicle processor. Also, it updates {@code /sys/power/pm_silentmode_kernel} in 51 * sysfs to tell kernel the current Silent Mode. 52 */ 53 class SilentModeHandler final { 54 public: 55 explicit SilentModeHandler(ISilentModeChangeHandler* server); 56 57 // Initialize SilentModeHandler instance. 58 void init(); 59 // Release the resource to prepare termination. 60 void release(); 61 // Returns the current Silent Mode. 62 bool isSilentMode(); 63 // Stops monitoring the change on /sys/power/pm_silentmode_hw_state. 64 void stopMonitoringSilentModeHwState(bool shouldWaitThread); 65 // Dumps the internal state. 66 android::base::Result<void> dump(int fd, const Vector<String16>& args); 67 68 private: 69 android::base::Result<void> updateKernelSilentMode(bool silent); 70 void startMonitoringSilentModeHwState(); 71 void handleSilentModeHwStateChange(); 72 void handleSilentModeChange(bool silent); 73 android::base::Result<void> enableBootAnimation(bool enabled); 74 75 android::Mutex mMutex; 76 bool mSilentModeByHwState GUARDED_BY(mMutex); 77 bool mForcedMode = false; 78 std::string mBootReason; 79 std::string mSilentModeHwStateFilename; 80 std::string mKernelSilentModeFilename; 81 ISilentModeChangeHandler* mSilentModeChangeHandler; 82 std::thread mSilentModeMonitoringThread; 83 android::base::unique_fd mFdInotify; 84 int mWdSilentModeHwState = -1; 85 std::atomic_bool mIsMonitoring = false; 86 87 // For unit tests. 88 friend class internal::SilentModeHandlerPeer; 89 }; 90 91 } // namespace powerpolicy 92 } // namespace automotive 93 } // namespace frameworks 94 } // namespace android 95 96 #endif // CPP_POWERPOLICY_SERVER_SRC_SILENTMODEHANDLER_H_ 97