文章目录

前言
HIDL 简介
- 启动流程
- HIDL 使用
- Jni 流程： HIDL 客户端使用
- HIDL 服务端
相关文件
- 0.【Java 安卓LED服务类】LightsService.java
- 1.【JNI 客户端实现】com_android_server_lights_LightsService.cpp
- 2.【HIDL 客户】ILight.与 HIDL 服务库通信.hal
- 3.【HIDL 客户】LightAll.cpp.调用 HIDL 服务库
- 4.【HIDL 服务】android.hardware.light@2.0-service.启动注册 HIDL 服务库
- 4.【HIDL 服务】service.cpp.向上注册 HIDL 服务库
- 5.【HIDL 服务】Light.h
- 6.【HIDL 服务】Light.cpp.加载调用传统库
- 7.【HAL 实现】lights.c.传统 HAL 库
- 8.【内核实现】leds-qpnp.c

前言

学习笔记，简单介绍了 light 在 Android 8.0 上的整个调用流程
更新上添加下调用流程线，将各个文件串起来

HIDL 简介

一张图开场

 其实主要是就是将以前那种 Java-> Jni -> Hal -> Kernel 的结构变成了Java -> Jni -> Binder 客户端 ====== Binder 通信 ======> Binder 服务端 -> Hal -> Kernel 将 framework 与 Hal 之间的交互变成了 CS 结构了。

插播下 Java Binder 服务编写框图：

C++ Binder 服务编写框图：

启动流程

 // SystemServer.java (frameworks\base\services\java\com\android\server)import com.android.server.lights.LightsService;startBootstrapServices()  # 此函数可参考 BatteryService 流程分析mSystemServiceManager.startService(LightsService.class);// SystemServiceManager.java (frameworks\base\services\core\java\com\android\server)startService(Class<T> serviceClass)# 获取类名final String name = serviceClass.getName();# 获得构造函数： public LightsService(Context context)Constructor<T> constructor = serviceClass.getConstructor(Context.class);# 调用构造函数，创建类对象service = constructor.newInstance(mContext);// LightsService.java (frameworks\base\services\core\java\com\android\server\lights)// 构造函数：LightsService(Context context)super(context);for (int i = 0; i < LightsManager.LIGHT_ID_COUNT; i++) {mLights[i] = new LightImpl(i);}# 添加到 SystemService 链表中管理，并启动服务startService(service);mServices.add(service);service.onStart();// LightsService.java (frameworks\base\services\core\java\com\android\server\lights)onStart()// 这是向 systemservice.java 注册了一些回调，只让其调用使用？// Publish the service so it is only accessible to the system process// 让其只能在 system 进程中访问？//      ./base/services/core/java/com/android/server/power/PowerManagerService.java:736:            //          mBatteryManagerInternal = getLocalService(BatteryManagerInternal.class);publishLocalService(LightsManager.class, mService);

HIDL 使用

// 接口文件：
//  Z:\work\A306_eng\src\hardware\interfaces\light\2.0\ILight.halpackage android.hardware.light@2.0;interface ILight {/*** Set the provided lights to the provided values.** @param type logical light to set* @param state describes what the light should look like.* @return status result of applying state transformation.*/setLight(Type type, LightState state) generates (Status status);/*** Discover what indicator lights are available.** @return types list of available lights*/getSupportedTypes() generates (vec<Type> types);};// 编译文件：
// Z:\work\A306_eng\src\hardware\interfaces\light\2.0\Android.bpfilegroup {name: "android.hardware.light@2.0_hal",srcs: ["types.hal","ILight.hal",],}genrule {name: "android.hardware.light@2.0_genc++",tools: ["hidl-gen"],cmd: "$(location hidl-gen) -o $(genDir) -Lc++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.light@2.0",srcs: [":android.hardware.light@2.0_hal",],out: ["android/hardware/light/2.0/types.cpp","android/hardware/light/2.0/LightAll.cpp",],}// 编译工具： out/host/linux-x86/bin/hidl-gen // 生成文件：//      Z:\work\A306_eng\src\out\soong\.intermediates\hardware\interfaces\light\2.0\android.hardware.light@2.0_genc++\gen\android\hardware\light\2.0\LightAll.cppgetService(): 获取 servicemanager 中的对应 binder 服务 BnHwLight::onTransact()# 服务器端，调用具体子类提供服务操作硬件_hidl_mImpl->setLight(type, *state);BpHwLight::setLight(Type type, const LightState& state): # 客户端，提供远程调用服务端接口1. 填充 Parcel 数据2. 调用 remote() 通过 binder 调用到服务器端执行_hidl_err = remote()->transact(1 /* setLight */, _hidl_data, &_hidl_reply);

Jni 流程： HIDL 客户端使用

// com_android_server_lights_LightsService.cpp (frameworks\base\services\core\jni)
static void setLight_native( JNIEnv* /* env */, jobject /* clazz */, jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS,jint brightnessMode) # HAL 服务获取: HIDL 接口，从 servicemanager 中获取 Light 服务sp<ILight> hal = LightHal::associate();// will return the hal if it exists the first time.sLight = ILight::getService();// Z:\work\A306_eng\src\out\soong\.intermediates\hardware\interfaces\light\2.0\android.hardware.light@2.0_genc++\gen\android\hardware\light\2.0\LightAll.cpp::android::sp<ILight> ILight::getService(const std::string &serviceName, const bool getStub) const sp<::android::hidl::manager::V1_0::IServiceManager> sm = defaultServiceManager();Return<Transport> transportRet = sm->getTransport(ILight::descriptor, serviceName);if (getStub || vintfPassthru || vintfLegacy) {# 获取 PassthroughServiceManager 服务 const sp<::android::hidl::manager::V1_0::IServiceManager> pm = getPassthroughServiceManager();Return<sp<::android::hidl::base::V1_0::IBase>> ret = pm->get(ILight::descriptor, serviceName);// ServiceManagement.cpp (system\libhidl\transport)struct PassthroughServiceManager : IServiceManager {Return<sp<IBase>> get(const hidl_string& fqName,const hidl_string& name){# PassthroughServiceManager 的 get(const hidl_string& fqName, const hidl_string& name)# 函数根据传入的 fqName=(android.hardware.cameraProvider@2.4::ICameraProvider"),# 获取当前的接口名ICameraProvider，#   拼接出后面需要载入的函数名：HIDL_FETCH_ICameraProvider 和库名字：#           android.hardware.camera.provider@2.4-impl.sostd::string stdFqName(fqName.c_str());//fqName looks like android.hardware.foo@1.0::IFoosize_t idx = stdFqName.find("::");if (idx == std::string::npos ||idx + strlen("::") + 1 >= stdFqName.size()) {LOG(ERROR) << "Invalid interface name passthrough lookup: " << fqName;return nullptr;}std::string packageAndVersion = stdFqName.substr(0, idx);std::string ifaceName = stdFqName.substr(idx + strlen("::"));const std::string prefix = packageAndVersion + "-impl";const std::string sym = "HIDL_FETCH_" + ifaceName;# 接着通过 dlopen 载入 /vendor/lib/hw/android.hardware.light@2.0-impl.so；#   通过 dlsym 载入 HIDL_FETCH_ICameraProvider 函数# 至此正式进入cameraprovider的implementstd::vector<std::string> libs = search(path, prefix, ".so");handle = dlopen(fullPath.c_str(), dlMode);IBase* (*generator)(const char* name);*(void **)(&generator) = dlsym(handle, sym.c_str());IBase *interface = (*generator)(name.c_str());################################################################## 调用 HIDL 服务入口函数#################################################################// Z:\work\A306_eng\src\hardware\interfaces\light\2.0\default\Light.cppILight* HIDL_FETCH_ILight(const char* /* name */) {std::map<Type, light_device_t*> lights;for(auto const &pair : kLogicalLights) {Type type = pair.first;const char* name = pair.second;light_device_t* light = getLightDevice(name);############################################## 老 HAL 库加载#############################################light_device_t* getLightDevice(const char* name)int ret = hw_get_module (LIGHTS_HARDWARE_MODULE_ID, &hwModule);// Lights.c (hardware\qcom\display\liblight)struct hw_module_t HAL_MODULE_INFO_SYM = {.tag = HARDWARE_MODULE_TAG,.version_major = 1,.version_minor = 0,.id = LIGHTS_HARDWARE_MODULE_ID,.name = "lights Module",.author = "Google, Inc.",.methods = &lights_module_methods,};static struct hw_module_methods_t lights_module_methods = {.open =  open_lights,};ret = hwModule->methods->open(hwModule, name,reinterpret_cast<hw_device_t**>(&lightDevice));// Light.cpp (vendor\qcom\proprietary\fastmmi\module\light)open_lights(const struct hw_module_t* module, char const* name,struct hw_device_t** device)set_light = set_light_notifications;handle_speaker_battery_locked(dev);set_speaker_light_locked(dev, &g_notification);// wangjun@wind-mobi.com 20180111 begein// 闪烁之前清灯状态write_int(RED_LED_FILE, 0);write_int(GREEN_LED_FILE, 0);write_int(BLUE_LED_FILE, 0);# 往 /sys/class/leds/green/brightness 这类的结点写亮度值fd = open(path, O_RDWR);int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);ssize_t amt = write(fd, buffer, (size_t)bytes);close(fd);// wangjun@wind-mobi.com 20180111 endif (light != nullptr) {lights[type] = light;}}if (lights.size() == 0) {// Log information, but still return new Light.// Some devices may not have any lights.ALOGI("Could not open any lights.");}return new Light(std::move(lights));}Type type = static_cast<Type>(light);// 构造 LightState 状态类 LightState state = constructState( colorARGB, flashMode, onMS, offMS, brightnessMode);ALOGD_IF_SLOW(50, "Excessive delay setting light");# HIDL 接口向 HAL 下发灯状态给他处理Return<Status> ret = hal->setLight(type, state);# 处理通信返回值processReturn(ret, type, state);

HIDL 服务端

// Z:\work\A306_eng\src\hardware\interfaces\light\2.0\default\Android.mkinclude $(CLEAR_VARS)LOCAL_MODULE_RELATIVE_PATH := hwLOCAL_PROPRIETARY_MODULE := trueLOCAL_MODULE := android.hardware.light@2.0-serviceLOCAL_INIT_RC := android.hardware.light@2.0-service.rcLOCAL_SRC_FILES := \service.cpp \LOCAL_SHARED_LIBRARIES := \liblog \libcutils \libdl \libbase \libutils \libhardware \LOCAL_SHARED_LIBRARIES += \libhidlbase \libhidltransport \android.hardware.light@2.0 \include $(BUILD_EXECUTABLE)// 服务启动：// Z:\work\A306_eng\src\hardware\interfaces\light\2.0\default\android.hardware.light@2.0-service.rcservice light-hal-2-0 /vendor/bin/hw/android.hardware.light@2.0-serviceclass haluser systemgroup system    // Z:\work\A306_eng\src\hardware\interfaces\light\2.0\default\service.cppint main() {return defaultPassthroughServiceImplementation<ILight>();/// LegacySupport.h (system\libhidl\transport\include\hidl)defaultPassthroughServiceImplementation(std::string name, size_t maxThreads = 1)configureRpcThreadpool(maxThreads, true);configureBinderRpcThreadpool(maxThreads, callerWillJoin);ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/);status_t result = registerPassthroughServiceImplementation<Interface>(name);                                    registerPassthroughServiceImplementation( std::string name = "default")sp<Interface> service = Interface::getService(name, true /* getStub */);status_t status = service->registerAsService(name);joinRpcThreadpool();joinBinderRpcThreadpool();IPCThreadState::self()->joinThreadPool();}

相关文件

下面将从上到下介绍：

0.【Java 安卓LED服务类】LightsService.java

public class LightsService extends SystemService {// 下一级 Jni 接口static native void setLight_native(int light, int color, int mode,int onMS, int offMS, int brightnessMode);
}

1.【JNI 客户端实现】com_android_server_lights_LightsService.cpp

 static const JNINativeMethod method_table[] = {{ "setLight_native", "(IIIIII)V", (void*)setLight_native },};static void setLight_native(JNIEnv* /* env */,jobject /* clazz */,jint light,jint colorARGB,jint flashMode,jint onMS,jint offMS,jint brightnessMode) {if (!validate(light, flashMode, brightnessMode)) {return;}sp<ILight> hal = LightHal::associate();if (hal == nullptr) {return;}Type type = static_cast<Type>(light);LightState state = constructState(colorARGB, flashMode, onMS, offMS, brightnessMode);{ALOGD_IF_SLOW(50, "Excessive delay setting light");// 下一级入口 Return<Status> ret = hal->setLight(type, state);processReturn(ret, type, state);}}

2.【HIDL 客户】ILight.与 HIDL 服务库通信.hal

 定义了 HIDL 接口 package android.hardware.light@2.0;interface ILight {/*** Set the provided lights to the provided values.** @param type logical light to set* @param state describes what the light should look like.* @return status result of applying state transformation.*/setLight(Type type, LightState state) generates (Status status);/*** Discover what indicator lights are available.** @return types list of available lights*/getSupportedTypes() generates (vec<Type> types);};

3.【HIDL 客户】LightAll.cpp.调用 HIDL 服务库

::android::status_t BnHwLight::onTransact(uint32_t _hidl_code,const ::android::hardware::Parcel &_hidl_data,::android::hardware::Parcel *_hidl_reply,uint32_t _hidl_flags,TransactCallback _hidl_cb)// 下一级接口Status _hidl_out_status = _hidl_mImpl->setLight(type, *state);

4.【HIDL 服务】android.hardware.light@2.0-service.启动注册 HIDL 服务库

 service light-hal-2-0 /vendor/bin/hw/android.hardware.light@2.0-serviceclass haluser systemgroup system

4.【HIDL 服务】service.cpp.向上注册 HIDL 服务库

 int main() {return defaultPassthroughServiceImplementation<ILight>();    /// LegacySupport.h (system\libhidl\transport\include\hidl)defaultPassthroughServiceImplementation(std::string name, size_t maxThreads = 1)configureRpcThreadpool(maxThreads, true);configureBinderRpcThreadpool(maxThreads, callerWillJoin);ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/);status_t result = registerPassthroughServiceImplementation<Interface>(name);                                    registerPassthroughServiceImplementation( std::string name = "default")sp<Interface> service = Interface::getService(name, true /* getStub */);status_t status = service->registerAsService(name);joinRpcThreadpool();joinBinderRpcThreadpool();IPCThreadState::self()->joinThreadPool();

5.【HIDL 服务】Light.h

 namespace android {namespace hardware {namespace light {namespace V2_0 {namespace implementation {using ::android::hardware::light::V2_0::ILight;using ::android::hardware::light::V2_0::LightState;using ::android::hardware::light::V2_0::Status;using ::android::hardware::light::V2_0::Type;using ::android::hardware::Return;using ::android::hardware::Void;using ::android::hardware::hidl_vec;using ::android::hardware::hidl_string;using ::android::sp;struct Light : public ILight {Light(std::map<Type, light_device_t*> &&lights);// Methods from ::android::hardware::light::V2_0::ILight follow.Return<Status> setLight(Type type, const LightState& state)  override;Return<void> getSupportedTypes(getSupportedTypes_cb _hidl_cb)  override;private:std::map<Type, light_device_t*> mLights;};extern "C" ILight* HIDL_FETCH_ILight(const char* name);}  // namespace implementation}  // namespace V2_0}  // namespace light}  // namespace hardware}  // namespace android

6.【HIDL 服务】Light.cpp.加载调用传统库

 ILight* HIDL_FETCH_ILight(const char* /* name */) {std::map<Type, light_device_t*> lights;for(auto const &pair : kLogicalLights) {Type type = pair.first;const char* name = pair.second;// 加载传统 HAL 库 light_device_t* light = getLightDevice(name);if (light != nullptr) {lights[type] = light;}}if (lights.size() == 0) {// Log information, but still return new Light.// Some devices may not have any lights.ALOGI("Could not open any lights.");}return new Light(std::move(lights));}Light::Light(std::map<Type, light_device_t*> &&lights): mLights(std::move(lights)) {}// Methods from ::android::hardware::light::V2_0::ILight follow.Return<Status> Light::setLight(Type type, const LightState& state)  {auto it = mLights.find(type);if (it == mLights.end()) {return Status::LIGHT_NOT_SUPPORTED;}light_device_t* hwLight = it->second;light_state_t legacyState {.color = state.color,.flashMode = static_cast<int>(state.flashMode),.flashOnMS = state.flashOnMs,.flashOffMS = state.flashOffMs,.brightnessMode = static_cast<int>(state.brightnessMode),};int ret = hwLight->set_light(hwLight, &legacyState);switch (ret) {case -ENOSYS:return Status::BRIGHTNESS_NOT_SUPPORTED;case 0:return Status::SUCCESS;default:return Status::UNKNOWN;}}

7.【HAL 实现】lights.c.传统 HAL 库

 /** The lights Module*/struct hw_module_t HAL_MODULE_INFO_SYM = {.tag = HARDWARE_MODULE_TAG,.version_major = 1,.version_minor = 0,.id = LIGHTS_HARDWARE_MODULE_ID,.name = "lights Module",.author = "Google, Inc.",.methods = &lights_module_methods,};/*** module methods*//** Open a new instance of a lights device using name */
static int open_lights(const struct hw_module_t* module, char const* name,struct hw_device_t** device)
{int (*set_light)(struct light_device_t* dev,struct light_state_t const* state);if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {char property[PROPERTY_VALUE_MAX];property_get("persist.extend.brightness", property, "0");if(!(strncmp(property, "1", PROPERTY_VALUE_MAX)) ||!(strncmp(property, "true", PROPERTY_VALUE_MAX))) {property_get("persist.display.max_brightness", property, "255");g_brightness_max = atoi(property);set_brightness_ext_init();set_light = set_light_backlight_ext;} else// 调用接口 set_light , 上层会调用到这里来set_light = set_light_backlight;} else if (0 == strcmp(LIGHT_ID_BATTERY, name))set_light = set_light_battery;else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))set_light = set_light_notifications;else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {if (!access(BUTTON_FILE, F_OK)) {// enable light button when the file is present              set_light = set_light_buttons;} else {return -EINVAL;}}else if (0 == strcmp(LIGHT_ID_ATTENTION, name))set_light = set_light_attention;elsereturn -EINVAL;pthread_once(&g_init, init_globals);struct light_device_t *dev = malloc(sizeof(struct light_device_t));if(!dev)return -ENOMEM;memset(dev, 0, sizeof(*dev));dev->common.tag = HARDWARE_DEVICE_TAG;dev->common.version = LIGHTS_DEVICE_API_VERSION_2_0;dev->common.module = (struct hw_module_t*)module;dev->common.close = (int (*)(struct hw_device_t*))close_lights;dev->set_light = set_light;*device = (struct hw_device_t*)dev;return 0;
}# 更新灯则通过 sys/class/led/xxx/bright 来操作的
// char const*const RED_LED_FILE    = "/sys/class/leds/red/brightness";
set_speaker_light_locked(struct light_device_t* dev,struct light_state_t const* state)write_int(RED_LED_FILE, 0);int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);ssize_t amt = write(fd, buffer, (size_t)bytes);

8.【内核实现】leds-qpnp.c

【充电 CHG_LED 可用红灯配置流程】：// Msm8937-pmi8940-mtp.dtsi (kernel\msm-3.18\arch\arm64\boot\dts\qcom)&pmi8940_charger {qcom,battery-data = <&mtp_batterydata>;qcom,chg-led-sw-controls;qcom,chg-led-support;};解析使用位置：Qpnp-smbcharger.c (kernel\msm-3.18\drivers\power)static int __init smbchg_init(void)// static struct spmi_driver smbchg_driver = {//     .driver       = {//         .name        = "qpnp-smbcharger",//         .owner        = THIS_MODULE,//         .of_match_table   = smbchg_match_table,//         .pm        = &smbchg_pm_ops,//     },//     .probe        = smbchg_probe,//     .remove      = smbchg_remove,//     .shutdown   = smbchg_shutdown,// };return spmi_driver_register(&smbchg_driver);smbchg_probe(struct spmi_device *spmi)smb_parse_dt(struct smbchg_chip *chip)chip->cfg_chg_led_support = of_property_read_bool(node, "qcom,chg-led-support");。。。    if (chip->cfg_chg_led_support && chip->schg_version == QPNP_SCHG_LITE)    rc = smbchg_register_chg_led(chip);chip->led_cdev.name = "red";chip->led_cdev.brightness_set = smbchg_chg_led_brightness_set;chip->led_cdev.brightness_get = smbchg_chg_led_brightness_get;rc = led_classdev_register(chip->dev, &chip->led_cdev);

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基于 Light 介绍安卓 8.0 HAL 变化

文章目录

前言

HIDL 简介

启动流程

HIDL 使用

Jni 流程： HIDL 客户端使用

HIDL 服务端

相关文件

0.【Java 安卓LED服务类】LightsService.java

1.【JNI 客户端实现】com_android_server_lights_LightsService.cpp

2.【HIDL 客户】ILight.与 HIDL 服务库通信.hal

3.【HIDL 客户】LightAll.cpp.调用 HIDL 服务库

4.【HIDL 服务】android.hardware.light@2.0-service.启动注册 HIDL 服务库

4.【HIDL 服务】service.cpp.向上注册 HIDL 服务库

5.【HIDL 服务】Light.h

6.【HIDL 服务】Light.cpp.加载调用传统库

7.【HAL 实现】lights.c.传统 HAL 库

8.【内核实现】leds-qpnp.c

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