时序图

open( )

CameraDeviceclient.cpp

init( )

HalSensor.cpp

Camera3Device.cpp

 mSession->open();

initialize( )

HalSensor( )

mHalDeviceAdapter->open()

ioctl( )

imgsensor_probe( )

createSensor( )

struct SENSOR_FUNCTION_STRUCT *psensor_func =  psensor->pfunc; 

AppStreamMgr.cpp

getVirtualDeviceLocked( )validateOpenLocked( )attachOpenDeviceLocked( )SetTorchModeStatusCommand( )

 IAppStreamManager::create(creationInfo)继续查找

PipelineModeManagerImpl.cpp

CameraDevice3SessionImpl.cpp

adopt_CAMERA_HW_FeatureControl( )

get( )

getPipelineModel( )

initializeImpl( )

onOpenLocked( )

imgsensor_drv.cpp

imgsensor_sensor_list.c

HalDeviceAdapter.cpp

CameraProviderManager.cpp

openSession( )

HalSensorList.openlist.cpp

imgsensor.c

powerOn( )

CameraDevice3Impl.cpp

CameraDeviceManagerBase.cpp

imgsensor_init( )

imgsensor_ioctl( )

platform_driver_register( )

onCreate( )

Camera2ClientBase()

pDeviceManager->startOpenDevice显示调用的是CameraDeviceManagerBase该文件的startOpenDevice函数

startOpenDevice( )

imgsensor_sensor_open( )

Camera3Device()

Camera2ClientBase.cpp

CameraService.cpp

在追代码流程的时候，可以先查找关键词，如果有调用到关键词或者关键词定义的地方，先记下来，然后再继续往上查找（有些在调用时直接会在前面标明这个哪个文件的函数），直到查找到与其他文件有交集的地方，有些可能比较隐蔽，但是如果已经知道结果也可以倒追。

create( )

openSensor( )

xxxx_mipi_sensor.c

featureControl( )

finishOpenDevice( )

PipelineModelImpl.cpp

实例化CameraDeviceClient