MTK Camera上电流程分析

1、Camera上电过程中，系统会初始化一系列的服务，其中就有CameraServer的相关服务，系统通过FrameWorks层调用get_number_of_camera函数，调用到hal层上vendor/mediatek/proprietary/hardware/mtkcam./legacy/module_hal/devicemgr/CamDeviceManagerBash.cpp里的函数

int32_t
CamDeviceManagerBase::
getNumberOfDevices()
{RWLock::AutoWLock _l(mRWLock);//if  ( 0 != mi4DeviceNum ){
#if MTK_CROSSMOUNT_SUPPORTmi4DeviceNum = mEnumMap.size() + mExternalDeviceInfoMap.size() - 1;MY_LOGD("#devices:%d #remote:%u mEnumMap:%u", mi4DeviceNum, mExternalDeviceInfoMap.size(), mEnumMap.size());
#elseMY_LOGD("#devices:%d", mi4DeviceNum);
#endif}else{Utils::CamProfile _profile(__FUNCTION__, "CamDeviceManagerBase");mi4DeviceNum = enumDeviceLocked();_profile.print("");}//return  mi4DeviceNum;
}

这里只是调用了enumDeviceLocked函数，并将它的返回值（camera的个数），返回到上层。enumDeviceLocked的实现如

int32_t
CamDeviceManagerImp::
enumDeviceLocked()
{status_t status = OK;int32_t i4DeviceNum = 0;//
#if '1'==MTKCAM_HAVE_METADATANSMetadataProviderManager::clear();
#endif
#if OPTION__NEED_DEVMETAINFODevMetaInfo::clear();
#endifmEnumMap.clear();
//------------------------------------------------------------------------------
#if '1'==MTKCAM_HAVE_SENSOR_HAL//IHalSensorList*const pHalSensorList = IHalSensorList::get();size_t const sensorNum = pHalSensorList->searchSensors();
#if 0SensorHal::createInstance()->searchSensor();;
#endif

重点关注pHalSensorList->searchSensors()的调用流程

MUINT
HalSensorList::
searchSensors()
{Mutex::Autolock _l(mEnumSensorMutex);//MY_LOGD("searchSensors");return  enumerateSensor_Locked();
}

MUINT
HalSensorList::
enumerateSensor_Locked()
{int ret_count = 0;int ret = 0;//#warning "[WARN] Simulation for enumerateSensor_Locked()"MUINT halSensorDev = SENSOR_DEV_NONE;NSFeature::SensorInfoBase* pSensorInfo ;SensorDrv *const pSensorDrv = SensorDrv::get();SeninfDrv *const pSeninfDrv = SeninfDrv::createInstance();if(!pSeninfDrv) {MY_LOGE("pSeninfDrv == NULL");return 0;}ret = pSeninfDrv->init();if(ret < 0) {MY_LOGE("pSeninfDrv->init() fail");return 0;}pSeninfDrv->setMclk1(1, 1, 1, 0, 1, 0, 0);pSeninfDrv->setMclk2(1, 1, 1, 0, 1, 0, 0);//pSeninfDrv->setMclk3(1, 1, 1, 0, 1, 0, 0);  /* No main2 */int const iSensorsList = pSensorDrv->impSearchSensor(NULL);//query sensorinfoquerySensorDrvInfo();//fill in metadatabuildSensorMetadata();

接着比较重要的就是impSearchSensor的实现。

MINT32
ImgSensorDrv::impSearchSensor(pfExIdChk pExIdChkCbf)
{MUINT32 SensorEnum = (MUINT32) DUAL_CAMERA_MAIN_SENSOR;MUINT32 i,id[KDIMGSENSOR_MAX_INVOKE_DRIVERS] = {0,0};MBOOL SensorConnect=TRUE;UCHAR cBuf[64];MINT32 err = SENSOR_NO_ERROR;MINT32 err2 = SENSOR_NO_ERROR;ACDK_SENSOR_INFO_STRUCT SensorInfo;ACDK_SENSOR_CONFIG_STRUCT SensorConfigData;ACDK_SENSOR_RESOLUTION_INFO_STRUCT SensorResolution;MINT32 sensorDevs = SENSOR_NONE;IMAGE_SENSOR_TYPE sensorType = IMAGE_SENSOR_TYPE_UNKNOWN;IMGSENSOR_SOCKET_POSITION_ENUM socketPos = IMGSENSOR_SOCKET_POS_NONE;//! If imp sensor search process already done before,//! only need to return the sensorDevs, not need to//! search again.if (SENSOR_DOES_NOT_EXIST != m_mainSensorId) {//been processed.LOG_MSG("[impSearchSensor] Already processed \n");if (BAD_SENSOR_INDEX != m_mainSensorIdx) {sensorDevs |= SENSOR_MAIN;}if (BAD_SENSOR_INDEX != m_main2SensorIdx) {sensorDevs |= SENSOR_MAIN_2;}if (BAD_SENSOR_INDEX != m_subSensorIdx) {sensorDevs |= SENSOR_SUB;}#ifdef  ATVCHIP_MTK_ENABLEsensorDevs |= SENSOR_ATV;#endifreturn sensorDevs;} GetSensorInitFuncList(&m_pstSensorInitFunc);LOG_MSG("SENSOR search start \n");if (-1 != m_fdSensor) {::close(m_fdSensor);m_fdSensor = -1;}sprintf(cBuf,"/dev/%s",CAMERA_HW_DEVNAME);m_fdSensor = ::open(cBuf, O_RDWR);if (m_fdSensor < 0) {LOG_ERR("[impSearchSensor]: error opening %s: %s \n", cBuf, strerror(errno));return sensorDevs;}// search main/main_2/sub 3 sockets// DUAL_CAMERA_MAIN_SENSOR = 1   DUAL_CAMERA_SUB_SENSOR = 2
#ifdef MTK_MAIN2_IMGSENSORfor (SensorEnum = DUAL_CAMERA_MAIN_SENSOR; SensorEnum <= DUAL_CAMERA_MAIN_2_SENSOR; SensorEnum <<= 1)  {LOG_MSG("impSearchSensor search to main_2\n");
#else#ifdef MTK_SUB_IMGSENSORfor (SensorEnum = DUAL_CAMERA_MAIN_SENSOR; SensorEnum <= DUAL_CAMERA_SUB_SENSOR; SensorEnum <<= 1)  {LOG_MSG("impSearchSensor search to sub\n");#elsefor (SensorEnum = DUAL_CAMERA_MAIN_SENSOR; SensorEnum < DUAL_CAMERA_SUB_SENSOR; SensorEnum <<= 1)  {LOG_MSG("impSearchSensor search to main\n");#endif
#endif//for (i = 0; i < MAX_NUM_OF_SUPPORT_SENSOR; i++) {//end of driver listif (m_pstSensorInitFunc[i].getCameraDefault == NULL) {LOG_MSG("m_pstSensorInitFunc[i].getCameraDefault is NULL: %d \n", i);break;}//set sensor driverid[KDIMGSENSOR_INVOKE_DRIVER_0] = (SensorEnum << KDIMGSENSOR_DUAL_SHIFT) | i;LOG_MSG("set sensor driver id =%x\n", id[KDIMGSENSOR_INVOKE_DRIVER_0]);err = ioctl(m_fdSensor, KDIMGSENSORIOC_X_SET_DRIVER,&id[KDIMGSENSOR_INVOKE_DRIVER_0] );if (err < 0) {LOG_ERR("ERROR:KDCAMERAHWIOC_X_SET_DRIVER\n");}//err = open();err = ioctl(m_fdSensor, KDIMGSENSORIOC_T_CHECK_IS_ALIVE);if (err < 0) {LOG_MSG("[impSearchSensor] Err-ctrlCode (%s) \n", strerror(errno));}//sensorType = this->getCurrentSensorType((SENSOR_DEV_ENUM)SensorEnum);//socketPos = this->getSocketPosition((CAMERA_DUAL_CAMERA_SENSOR_ENUM)SensorEnum);//check extra ID , from EEPROM maybe

在impSearchSensor的实现中，它最先调用的GetSensorInitFuncList(&m_pstSensorInitFunc);去挂载hal层的功能函数。

ImgSensorDrv::
ImgSensorDrv(): SensorDrv(), m_fdSensor(-1), m_mainSensorId(SENSOR_DOES_NOT_EXIST), m_main2SensorId(SENSOR_DOES_NOT_EXIST), m_subSensorId(SENSOR_DOES_NOT_EXIST), m_mainSensorIdx(BAD_SENSOR_INDEX), m_main2SensorIdx(BAD_SENSOR_INDEX), m_subSensorIdx(BAD_SENSOR_INDEX), m_pMainSensorInfo(NULL), m_pSubSensorInfo(NULL), m_pstSensorInitFunc(NULL)                                                                                                              , mUsers(0)

查看类的构造,找到类的成员

    MSDK_SENSOR_INIT_FUNCTION_STRUCT*   m_pstSensorInitFunc;

继续查找MSDK_SENSOR_INIT_FUNCTION_STRUCT*

#define YUV_INFO(_id, name, getCalData)\{ \_id, name, \NSFeature::YUVSensorInfo<_id>::createInstance(name, #name), \(NSFeature::SensorInfoBase*(*)()) \NSFeature::YUVSensorInfo<_id>::getInstance, \NSFeature::YUVSensorInfo<_id>::getDefaultData, \getCalData, \NSFeature::YUVSensorInfo<_id>::getNullFlickerPara \}
#define RAW_INFO(_id, name, getCalData)\{ \_id, name, \NSFeature::RAWSensorInfo<_id>::createInstance(name, #name), \(NSFeature::SensorInfoBase*(*)()) \NSFeature::RAWSensorInfo<_id>::getInstance, \NSFeature::RAWSensorInfo<_id>::getDefaultData, \getCalData, \NSFeature::RAWSensorInfo<_id>::getFlickerPara \}//MSDK_SENSOR_INIT_FUNCTION_STRUCT SensorList[MAX_NUM_OF_SUPPORT_SENSOR] =
MSDK_SENSOR_INIT_FUNCTION_STRUCT SensorList[] =
{
#if defined(S5K5E2YA_MIPI_RAW) || defined(S5K5E2YA_MIPI_RAW_9013)RAW_INFO(S5K5E2YA_SENSOR_ID, SENSOR_DRVNAME_S5K5E2YA_MIPI_RAW, NULL),
#endif
#if defined(ST55A_MIPI_RAW_9013)RAW_INFO(ST55A_SENSOR_ID, SENSOR_DRVNAME_ST55A_MIPI_RAW, NULL),
#endif
#if defined(GC2755MIPI_RAW_9013)RAW_INFO(GC2755_SENSOR_ID, SENSOR_DRVNAME_GC2755_MIPI_RAW,NULL),
#endif

UINT32 GetSensorInitFuncList(MSDK_SENSOR_INIT_FUNCTION_STRUCT **ppSensorList)
{if (NULL == ppSensorList) {ALOGE("ERROR: NULL pSensorList\n");return MHAL_UNKNOWN_ERROR;}*ppSensorList = &SensorList[0];return MHAL_NO_ERROR;
} // GetSensorInitFuncList()

至此hal层和mtkcam开始关联起来，以上全红的文字是实现上比较巧妙的地方，框架中提供了一个单例实例，并让各种Sensor单独去实现以下比较重要的2个接口。

typedef NSFeature::RAWSensorInfo<SENSOR_ID> SensorInfoSingleton_T;                                                                           namespace NSFeature {
template <>
UINT32
SensorInfoSingleton_T::
impGetDefaultData(CAMERA_DATA_TYPE_ENUM const CameraDataType, VOID*const pDataBuf, UINT32 const size) const
{UINT32 dataSize[CAMERA_DATA_TYPE_NUM] = {sizeof(NVRAM_CAMERA_ISP_PARAM_STRUCT),sizeof(NVRAM_CAMERA_3A_STRUCT),sizeof(NVRAM_CAMERA_SHADING_STRUCT),sizeof(NVRAM_LENS_PARA_STRUCT),sizeof(AE_PLINETABLE_T),0,sizeof(CAMERA_TSF_TBL_STRUCT)};if (CameraDataType > CAMERA_DATA_TSF_TABLE || NULL == pDataBuf || (size < dataSize[CameraDataType])){return 1;}switch(CameraDataType){case CAMERA_NVRAM_DATA_ISP:memcpy(pDataBuf,&CAMERA_ISP_DEFAULT_VALUE,sizeof(NVRAM_CAMERA_ISP_PARAM_STRUCT));break;case CAMERA_NVRAM_DATA_3A:memcpy(pDataBuf,&CAMERA_3A_NVRAM_DEFAULT_VALUE,sizeof(NVRAM_CAMERA_3A_STRUCT));break;case CAMERA_NVRAM_DATA_SHADING:memcpy(pDataBuf,&CAMERA_SHADING_DEFAULT_VALUE,sizeof(NVRAM_CAMERA_SHADING_STRUCT));break;case CAMERA_DATA_AE_PLINETABLE:memcpy(pDataBuf,&g_PlineTableMapping,sizeof(AE_PLINETABLE_T));break;case CAMERA_DATA_TSF_TABLE:memcpy(pDataBuf,&CAMERA_TSF_DEFAULT_VALUE,sizeof(CAMERA_TSF_TBL_STRUCT));break;default:

typedef NSFeature::RAWSensorInfo<SENSOR_ID> SensorInfoSingleton_T;
namespace NSFeature {
template <>
UINT32
SensorInfoSingleton_T::
impGetFlickerPara(MINT32 sensorMode, MVOID*const pDataBuf) const
{ALOGD("impGetFlickerPara+ mode=%d", sensorMode);ALOGD("prv=%d, vdo=%d, cap=%d, zsd=%d",(int)e_sensorModePreview, (int)e_sensorModeVideoPreview, (int)e_sensorModeCapture, (int)e_sensorModeZsd );FLICKER_CUST_PARA* para;para =  (FLICKER_CUST_PARA*)pDataBuf;if(sensorMode == e_sensorModePreview)get_flicker_para_by_Preview(para);else if(sensorMode == e_sensorModeVideo){get_flicker_para_by_Video(para);}else if(sensorMode == e_sensorModeCapture){get_flicker_para_by_Capture(para);              }else if(sensorMode == e_sensorModeVideo1){

分析完了hal层的关联，接着我们分析kenel层中camear sensor driver的关联

            err = ioctl(m_fdSensor, KDIMGSENSORIOC_X_SET_DRIVER,&id[KDIMGSENSOR_INVOKE_DRIVER_0] );if (err < 0) {LOG_ERR("ERROR:KDCAMERAHWIOC_X_SET_DRIVER\n");}//err = open();err = ioctl(m_fdSensor, KDIMGSENSORIOC_T_CHECK_IS_ALIVE);if (err < 0) {LOG_MSG("[impSearchSensor] Err-ctrlCode (%s) \n", strerror(errno));}

从代码上看，mtkcam是通过ioctl去设置加载对应的driver并执行上下电id检测。
在kd_sensorlist.c里可以查看到相关的调用

#endifcase KDIMGSENSORIOC_X_SET_DRIVER:                                                                                                    i4RetValue = kdSetDriver((unsigned int *)pBuff);break;

int kdSetDriver(unsigned int *pDrvIndex)
{ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT *pSensorList = NULL;u32 drvIdx[KDIMGSENSOR_MAX_INVOKE_DRIVERS] = {0, 0};//这个数组的大小是2

  u32 i;

/* set driver for MAIN or SUB sensor */PK_INF("pDrvIndex:0x%08x/0x%08x\n", pDrvIndex[KDIMGSENSOR_INVOKE_DRIVER_0], pDrvIndex[KDIMGSENSOR_INVOKE_DRIVER_1]);/* Camera information */gDrvIndex = pDrvIndex[KDIMGSENSOR_INVOKE_DRIVER_0];
//获取driver层imgsensor的功能函数列表if (0 != kdGetSensorInitFuncList(&pSensorList)) {PK_ERR("ERROR:kdGetSensorInitFuncList()\n");return -EIO;}
//KDIMGSENSOR_INVOKE_DRIVER_0 = 0， KDIMGSENSOR_MAX_INVOKE_DRIVERS = 2
所以这里会被执行2次for (i = KDIMGSENSOR_INVOKE_DRIVER_0; i < KDIMGSENSOR_MAX_INVOKE_DRIVERS; i++) {/* */spin_lock(&kdsensor_drv_lock);
//设置为FALSE
g_bEnableDriver[i] = FALSE;
//前后摄标志获取，1为后摄，2为前摄
g_invokeSocketIdx[i] = (CAMERA_DUAL_CAMERA_SENSOR_ENUM)((pDrvIndex[i] & KDIMGSENSOR_DUAL_MASK_MSB) >> KDIMGSENSOR_DUAL_SHIFT);spin_unlock(&kdsensor_drv_lock);
//获取从上层传递下来的hal层的sensorlist里面排在第i顺序的imgsensor 的index
drvIdx[i] = (pDrvIndex[i] & KDIMGSENSOR_DUAL_MASK_LSB);/* */
//判断数组里是否已经存在了driver
if (DUAL_CAMERA_NONE_SENSOR == g_invokeSocketIdx[i]) {continue;}if (DUAL_CAMERA_SUB_SENSOR == g_invokeSocketIdx[i]) {spin_lock(&kdsensor_drv_lock);gI2CBusNum = SUPPORT_I2C_BUS_NUM2;spin_unlock(&kdsensor_drv_lock);/* PK_XLOG_INFO("kdSetDriver: switch I2C BUS2\n");
*/} else {spin_lock(&kdsensor_drv_lock);gI2CBusNum = SUPPORT_I2C_BUS_NUM1;spin_unlock(&kdsensor_drv_lock);/* PK_XLOG_INFO("kdSetDriver: switch I2C BUS1\n"); */}#endifPK_INF("g_invokeSocketIdx[%d]=%d,drvIdx[%d]=%d\n", i, g_invokeSocketIdx[i], i, drvIdx[i]);/*
PK_INF("[kdSetDriver]drvIdx[%d] = %d\n", i, drvIdx[i]); *//* */if (MAX_NUM_OF_SUPPORT_SENSOR > drvIdx[i]) {if (NULL == pSensorList[drvIdx[i]].SensorInit) {PK_ERR("ERROR:kdSetDriver()\n");return -EIO;} pSensorList[drvIdx[i]].SensorInit(&g_pInvokeSensorFunc[i]);if
(NULL == g_pInvokeSensorFunc[i]) {PK_ERR("ERROR:NULL g_pSensorFunc[%d]\n", i);return -EIO;}/* */spin_lock(&kdsensor_drv_lock);g_bEnableDriver[i] = TRUE;spin_unlock(&kdsensor_drv_lock);/* get sensor name */memcpy((char *)g_invokeSensorNameStr[i], (char *)pSensorList[drvIdx[i]].drvname,
sizeof(pSensorList[drvIdx[i]].drvname));/* return sensor ID *//* pDrvIndex[0] = (unsigned int)pSensorList[drvIdx].SensorId; */PK_INF("[%d][%d][%d][%s]\n", i, g_bEnableDriver[i], g_invokeSocketIdx[i], g_invokeSensorNameStr[i]);}}return 0;}

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