.net网站开发步骤,搭建网站平台有前途吗,公司旅游视频网站模板,wordpress 参数传人1 概述 最近正好在做关机充电这个#xff0c;就详细看看吧。还是本着保密的原则#xff0c;项目里的代码也不能直接用#xff0c;这里就用的Github的。https://github.com/aosp-mirror 具体位置是#xff1a;https://github.com/aosp-mirror/platform_system_core/tree/mai…1 概述 最近正好在做关机充电这个就详细看看吧。还是本着保密的原则项目里的代码也不能直接用这里就用的Github的。https://github.com/aosp-mirror 具体位置是https://github.com/aosp-mirror/platform_system_core/tree/main/healthd
核心代码压缩包只有3M比起AOSP整包的极度臃肿真是对比强烈。 2 代码框架 首先还是看BP编译的产物是charger但是在新版AOSP中服务却不是这个名字。新的是android.hardware.health-service.qti此外后面带一个--charger的参数。
cc_binary {name: charger,defaults: [charger_defaults],recovery_available: true,srcs: [charger.cpp,charger_utils.cpp,],shared_libs: [android.hardware.health2.0,android.hardware.health2.1,],target: {recovery: {// No UI and libsuspend for recovery charger.cflags: [-DCHARGER_FORCE_NO_UI1,],exclude_shared_libs: [libpng,],exclude_static_libs: [libhealthd_draw,libhealthd_charger,libhealthd_charger_ui,libminui,libsuspend,],}}
} 模块里面有个测试程序可以看看整个模块的用法。
int main(int /*argc*/, char** /*argv*/) {const char* dumpFile /data/local/tmp/dump.txt;auto config std::make_uniquehealthd_config();InitHealthdConfig(config.get());healthd_board_init(config.get());spIHealth passthrough new TestHealth(std::move(config));std::thread bgThread([] {android::ChargerHidl charger(passthrough);charger.StartLoop();});// wait for healthd_init to finishif (!getUpdateNotifier().waitFor(1000 /* wait ms */, true /* updated */)) {LOG_THIS(Time out.);exit(1);}passthrough-debug(createHidlHandle(dumpFile), {} /* options */);std::string content openToString(dumpFile);int status expectContains(content, {status: 4,health: 6,present: 1,level: 47,voltage: 45,temp: 987,current now: 99000,current avg: 98000,charge counter: 600,current now: 99,cycle count: 77,Full charge: 3515547});if (status 0) {LOG_THIS(Test success.);} else {LOG_THIS(Actual dump:\n%s, content.c_str());}exit(status); // force bgThread to exit
}
可以看到就是
android::ChargerHidl charger(passthrough);
charger.StartLoop(); 在Android的HIDLHAL Interface Definition Language框架中StartLoop是一个用于启动HIDL服务端线程循环的方法。它允许HIDL服务端在一个独立的线程中运行以便可以接收和处理来自客户端的请求。具体来说StartLoop方法会创建一个线程池并在这个线程池中运行使得服务端可以异步处理多个客户端请求 3 重点流程 整个其实是一个提供Hidl接口的服务。提供的接口如下
AIDL implementationHIDL implementationHealth::getChargeCounterUahHealth::getChargeCounterHealth::getCurrentNowMicroampsHealth::getCurrentNowHealth::getCurrentAverageMicroampsHealth::getCurrentAverageHealth::getCapacityHealth::getCapacityHealth::getChargeStatusHealth::getChargeStatusHealth::getEnergyCounterNwhHealth::getEnergyCounterHealth::getDiskStatsHealth::getDiskStatsHealth::getStorageInfoHealth::getStorageInfoHealth::BinderEventBinderHealth::BinderEventHealth::dumpHealth::debugHealth::ShouldKeepScreenOnHealth::shouldKeepScreenOnHealth::UpdateHealthInfoHealth::UpdateHealthInfo
类的定义如下
namespace android {// An implementation of Charger backed by HIDL implementation. Uses HIDL health
// HALs HalHealthLoop.
class ChargerHidl : public ::android::ChargerConfigurationInterface,public ::android::hardware::health::V2_1::implementation::HalHealthLoop {using HalHealthLoop ::android::hardware::health::V2_1::implementation::HalHealthLoop;using HealthInfo_2_1 android::hardware::health::V2_1::HealthInfo;public:explicit ChargerHidl(const spandroid::hardware::health::V2_1::IHealth service);std::optionalbool ChargerShouldKeepScreenOn() override;bool ChargerIsOnline() override { return HalHealthLoop::charger_online(); }void ChargerInitConfig(healthd_config* config) override { return HalHealthLoop::Init(config); }int ChargerRegisterEvent(int fd, BoundFunction func, EventWakeup wakeup) override {return HalHealthLoop::RegisterEvent(fd, func, wakeup);}bool ChargerEnableSuspend() override;// HealthLoop overridesvoid Heartbeat() override { charger_-OnHeartbeat(); }int PrepareToWait() override { return charger_-OnPrepareToWait(); }void Init(struct healthd_config* config) override { charger_-OnInit(config); }// HalHealthLoop overridesvoid OnHealthInfoChanged(const HealthInfo_2_1 health_info) override;private:spandroid::hardware::health::V2_1::IHealth service_;std::unique_ptrCharger charger_;
};
这里面有个私有变量是std::unique_ptrCharger charger_;在init的时候会同时初始化charger类。ChargerHidl类很多实现还是直接调用的Charger类方法。主要的定义还是在Charger类中。 这部分主要的功能也是在Charger::OnInit里面启动的。这里有一个epoll。之前写过这部分可以参考小试epoll-CSDN博客
不过charger好像不是epoll里面有一个Charger::OnHeartbeat()在每次的心跳中处理状态和事件。包括插拔充电器和按下电源键。
大概就是这些吧只是粗略的过了一遍看的也不是太仔细。。。 4 题外话
对了 从代码中可以看出对于C的高级应用还是很熟的。这点挺厉害的。
template typename T
class Atomic {public:Atomic(T init) : mValue(std::move(init)) {}void set(T newVal) {{std::lock_guardstd::mutex lock(mMutex);mValue std::move(newVal);}mChanged.notify_all();}bool waitFor(long ms, const T expectVal) {std::unique_lockstd::mutex lock(mMutex);return mChanged.wait_for(lock, std::chrono::milliseconds(ms),[this, expectVal] { return mValue expectVal; });}private:std::mutex mMutex;std::condition_variable mChanged;T mValue;
};Atomicbool getUpdateNotifier() {static Atomicbool val(false);return val;
} 5 参考
https://source.android.com/docs/core/perf/health?hlzh-cn
