VehicleHal.java - fwk层对应VehicleService
- 1、VehicleHal.java初始化
- 1.1 hal服务区分
- 1.2 简要时序图
- 2、PowerHalService为例
- 2.1 PowerHalService初始化和订阅
- 2.2 简要时序图
android12-release
【IVI】VehicleService启动
【IVI】车载设备硬件抽象层VHAL
【IVI】CarService启动
1、VehicleHal.java初始化
- CarService： 位于
/platform/packages/services/Car/。
- 流程主要有两个，一是创建
CarService.java#onCreate() -> ICarImpl.java#new -> VehicleHal.java#new，而是初始化CarService.java#onCreate() -> ICarImpl.java#init -> VehicleHal.java#initandroid.hardware.automotive.vehicle.V2_0.IVehicle.getService(instanceName)获取底层服务VehicleService.cpp/IVehicle.hal
VehicleHal.java创建初始化，此类处理与本机HAL的接口，并对接收的数据进行基本解析（类型检查）。然后将每个事件发送到相应的HalServiceBase实现。HalServiceBase负责将数据转换为相应的Car*Service和Car*Manager API。
1.1 hal服务区分
| hal服务区分 | 相关属性types.hal | 说明 | 对应API Manager和service |
|---|---|---|---|
| PowerHalService | AP_POWER_STATE_REQ、AP_POWER_STATE_REPORT、DISPLAY_BRIGHTNESS | 将 HAL 电源事件转换为更高级别的语义信息 | CarPowerManagementService - CarPowerManager |
| PropertyHalService | 此车辆 HAL 支持的所有属性配置的列表。mAllProperties即getAllPropConfigs() | HAL 服务的通用接口，通过 ICarProperty 来回发送车辆属性。通过 ICarProperty 来回传递车辆属性进行通信的服务应扩展此类。 | CarPropertyService - CarPropertyManager |
| InputHalService | HW_KEY_INPUT、HW_ROTARY_INPUT、HW_CUSTOM_INPUT | 将 HAL 输入事件转换为更高级别的语义信息。 | CarInputService - CarInputManager |
| VmsHalService | VEHICLE_MAP_SERVICE | VMS 客户端实现，它使用特定于 HAL 的消息编码代理 VmsPublisher/VmsSubscriber API 对车辆 HAL 的调用。 | |
| UserHalService | CREATE_USER、INITIAL_USER_INFO、REMOVE_USER、SWITCH_USER、USER_IDENTIFICATION_ASSOCIATION | 用于将OEM的自定义用户管理与Android集成的服务。 | CarUserService - CarUserManager |
| DiagnosticHalService | OBD2_LIVE_FRAME、OBD2_FREEZE_FRAME、OBD2_FREEZE_FRAME_INFO、OBD2_FREEZE_FRAME_CLEAR | 诊断 HAL 服务支持从 VHAL 收集诊断信息并将其转换为更高级别的语义信息 | CarDiagnosticService - CarDiagnosticManager |
| ClusterHalService | CLUSTER_SWITCH_UI、CLUSTER_DISPLAY_STATE、CLUSTER_REPORT_STATE、CLUSTER_REQUEST_DISPLAY、CLUSTER_NAVIGATION_STATE | 将 HAL 输入事件转换为更高级别的语义信息。 | ClusterHomeService - ClusterHomeManager |
| EvsHalService | EVS_SERVICE_REQUEST | 将CarEvsService感兴趣的HAL事件转换为更高级别的语义信息。 | CarEvsService - CarEvsManager |
| HalClient | 区别以上hal服务，VehicleHal.java通过HalClient底层IVehicle.hal交互 | 车辆 HAL 客户端。直接与车辆 HAL 接口 IVehicle 交互。包含一些可重试属性的逻辑，将车辆通知重定向到给定的活套线程。 |
1.2 简要时序图
2、PowerHalService为例
2.1 PowerHalService初始化和订阅
VehicleHal.java#init -> PowerHalService#init订阅最终调用到mVehicle.subscribe()，并注册监听回调IVehicleCallback即VehicleHal extends IVehicleCallback.Stub
IVehicleCallback.hal#onPropertyEvent -> VehicleHal.java#onPropertyEvent -> PowerHalService.java#onHalEvents -> PowerEventListener属性监听最终传递给APP等注册的监听PowerEventListener
private void dispatchEvents(List<VehiclePropValue> values, PowerEventListener listener) {for (VehiclePropValue v : values) {switch (v.prop) {case AP_POWER_STATE_REPORT:// Ignore this property event. It was generated inside of CarService.break;case AP_POWER_STATE_REQ:int state = v.value.int32Values.get(VehicleApPowerStateReqIndex.STATE);int param = v.value.int32Values.get(VehicleApPowerStateReqIndex.ADDITIONAL);Slog.i(CarLog.TAG_POWER, "Received AP_POWER_STATE_REQ="+ powerStateReqName(state) + " param=" + param);listener.onApPowerStateChange(new PowerState(state, param));break;case DISPLAY_BRIGHTNESS:{int maxBrightness;synchronized (mLock) {maxBrightness = mMaxDisplayBrightness;}int brightness = v.value.int32Values.get(0) * MAX_BRIGHTNESS / maxBrightness;if (brightness < 0) {Slog.e(CarLog.TAG_POWER, "invalid brightness: " + brightness+ ", set to 0");brightness = 0;} else if (brightness > MAX_BRIGHTNESS) {Slog.e(CarLog.TAG_POWER, "invalid brightness: " + brightness + ", set to "+ MAX_BRIGHTNESS);brightness = MAX_BRIGHTNESS;}Slog.i(CarLog.TAG_POWER, "Received DISPLAY_BRIGHTNESS=" + brightness);listener.onDisplayBrightnessChange(brightness);}break;}}
}
2.2 简要时序图
