lens驱动和HAL分析
一.6737的lens 搜索HAL层分析
Mcu_drv.cpp (vendor\mediatek\proprietary\hardware\mtkcam\legacy\platform\mt6735\core\featureio\drv\lens)	
根据摄像头搜索lens
MCUDrv::lensSearch( unsigned int a_u4CurrSensorDev, unsigned int a_u4CurrSensorId)//Camera_custom_msdk.cpp (vendor\mediatek\proprietary\custom\mt6735\hal\d1\camera_3a)LensCustomInit(a_u4CurrSensorDev); //得到lens列表,  //单独分析1   LensCustomGetInitFunc(&MCUDrv::m_LensInitFunc_main[0]);  //把LensCustomInit得到的数组赋值到a_pLensInitFuncmemcpy(a_pLensInitFunc, &LensInitFunc[0], sizeof(MSDK_LENS_INIT_FUNCTION_STRUCT) * MAX_NUM_OF_SUPPORT_LENS);MCUDrv::m_u4CurrLensIdx_main = 0;for (i=0; i<MAX_NUM_OF_SUPPORT_LENS; i++) //搜索每个lensif (MCUDrv::m_LensInitFunc_main[i].LensId == DUMMY_LENS_ID)  //如果某个lens的ID为DUMMY_LENS_ID，记录，这里是选择最后一个DUMMY_LENS_IDMCUDrv::m_u4CurrLensIdx_main = i;for (i=0; i<MAX_NUM_OF_SUPPORT_LENS; i++)//把当前的sensor id和数组里面的比较，如果有，就记录，并且跳槽，所以是选择匹配的第一个if ((MCUDrv::m_LensInitFunc_main[i].SensorId == a_u4CurrSensorId) && (a_u4CurrSensorId!=0xFFFF) && (a_u4CurrSensorId!=0x0))MCUDrv::m_u4CurrLensIdx_main = i;MCU_DRV_DBG("[idx]%d\n", i);break;LensCustomSetIndex(MCUDrv::m_u4CurrLensIdx_main); //记录下主摄像头的lens的IDgMainLensIdx = a_u4CurrIdx;//单独分析1//Lenslist.cpp (vendor\mediatek\proprietary\custom\mt6735\hal\d1\lens\src)GetLensInitFuncList(&LensInitFunc[0], a_u4CurrSensorDev);if(a_u4CurrSensorDev==2) //submemcpy(pLensList, &LensList_sub[0], sizeof(MSDK_LENS_INIT_FUNCTION_STRUCT)* MAX_NUM_OF_SUPPORT_LENS);else if(a_u4CurrSensorDev==4) //main 2memcpy(pLensList, &LensList_main2[0], sizeof(MSDK_LENS_INIT_FUNCTION_STRUCT)* MAX_NUM_OF_SUPPORT_LENS);else  // main or othersmemcpy(pLensList, &LensList_main[0], sizeof(MSDK_LENS_INIT_FUNCTION_STRUCT)* MAX_NUM_OF_SUPPORT_LENS);  //拷贝到pLensListMSDK_LENS_INIT_FUNCTION_STRUCT LensList_main[MAX_NUM_OF_SUPPORT_LENS] =
{{DUMMY_SENSOR_ID, DUMMY_LENS_ID, "Dummy", pDummy_getDefaultData},#if defined(SENSORDRIVE)	{OV3640_SENSOR_ID, SENSOR_DRIVE_LENS_ID, "kd_camera_hw", pSensorDrive_getDefaultData},#endif
#if defined(FM50AF){DUMMY_SENSOR_ID, FM50AF_LENS_ID, "FM50AF", pFM50AF_getDefaultData},#endif#if defined(DW9714AF){MN34152_SENSOR_ID, DW9714AF_LENS_ID, "DW9714AF", pDW9714AF_getDefaultData},{IMX219_SENSOR_ID, DW9714AF_LENS_ID, "DW9714AF", pDW9714AF_getDefaultData},#endif
}二.lens HAL层调用分析
Lens_drv.cpp (vendor\mediatek\proprietary\hardware\mtkcam\legacy\platform\mt6735\core\featureio\drv\lens)1.初始化
LensDrv::init(unsigned int a_u4CurrSensorDev )sprintf(cBuf, "/dev/%s", MCUDrv::m_LensInitFunc_main[a_u4CurrLensIdx].LensDrvName);m_fdMCU_main = open("/dev/MAINAF", O_RDWR); //打开这个节点memcpy(motorName.uMotorName, MCUDrv::m_LensInitFunc_main[a_u4CurrLensIdx].LensDrvName, 32); //得到AF的名字int err = ioctl(m_fdMCU_main,mcuIOC_S_SETDRVNAME,&motorName);   //设置AF的名字，驱动的AFIOC_S_SETDRVNAME，后面有分析2.移动马达
LensDrv::moveMCU(int a_i4FocusPos,unsigned int a_u4CurrSensorDev )a_fdMCU=m_fdMCU_main;//设置马达位置，操作/dev/MAINAF,a_i4FocusPos为知(0--1023),去的default，后面有分析err = ioctl(a_fdMCU,mcuIOC_T_MOVETO,(unsigned long)a_i4FocusPos);  3.获取马达信息
LensDrv::getMCUInfo(mcuMotorInfo *a_pMotorInfo, unsigned int a_u4CurrSensorDev )err = ioctl(a_fdMCU,mcuIOC_G_MOTORINFO, &motorInfo);。。。。。。。。其他操作。。。。。。。。。三.Main_lens公共驱动分析
Main_lens.c (kernel-3.18\drivers\misc\mediatek\lens)#define PLATFORM_DRIVER_NAME "lens_actuator_main_af"/* platform structure */
static struct platform_driver g_stAF_Driver = {.probe = AF_probe,.remove = AF_remove,.suspend = AF_suspend,.resume = AF_resume,.driver = {.name = PLATFORM_DRIVER_NAME,.owner = THIS_MODULE,}
};static struct platform_device g_stAF_device = {.name = PLATFORM_DRIVER_NAME,.id = 0,.dev = {}
};1.初始化，注册平台设备驱动
MAINAF_i2C_initplatform_device_register(&g_stAF_device) //平台驱动匹配，进入probe函数platform_driver_register(&g_stAF_Driver)2.注册I2C设备
#if I2C_CONFIG_SETTING == 2
static const struct of_device_id MAINAF_of_match[] = {{.compatible = "mediatek,CAMERA_MAIN_AF"},{},
};
#endif
static struct i2c_driver AF_i2c_driver = {.probe = AF_i2c_probe,.remove = AF_i2c_remove,.driver.name = AF_DRVNAME,
#if I2C_CONFIG_SETTING == 2.driver.of_match_table = MAINAF_of_match,
#endif.id_table = AF_i2c_id,
};AF_probei2c_add_driver(&AF_i2c_driver); //匹配进入AF_i2c_probe函数,生成节点/sys/bus/i2c/drivers/MAINAF3.I2C初始化static const struct file_operations g_stAF_fops = {.owner = THIS_MODULE,.open = AF_Open,.release = AF_Release,.unlocked_ioctl = AF_Ioctl,
#ifdef CONFIG_COMPAT.compat_ioctl = AF_Ioctl,
#endif
};AF_i2c_probeg_pstAF_I2Cclient = client; //保存client，应该和camera一样，先注册个假的地址i4RetValue = Register_AF_CharDrv();alloc_chrdev_region(&g_AF_devno, 0, 1, AF_DRVNAME) //分配设备号g_pAF_CharDrv = cdev_alloc(); //分配字符设备#define AF_DRVNAME "MAINAF"cdev_init(g_pAF_CharDrv, &g_stAF_fops); 初始化操作函数cdev_add(g_pAF_CharDrv, g_AF_devno, 1) //注册进系统，生成节点/dev/MAINAFactuator_class = class_create(THIS_MODULE, AF_DRIVER_CLASS_NAME);   //创建classvcm_device = device_create(actuator_class, NULL, g_AF_devno, NULL, AF_DRVNAME); //创建设备节点sys/bus/platform/drivers/lens_actuator_main_af4.AF_Ioctl,提供接口给上层使用
//lens的list
static stAF_DrvList g_stAF_DrvList[MAX_NUM_OF_LENS] = {#ifdef CONFIG_MTK_LENS_BU6424AF_SUPPORT{1, AFDRV_BU6424AF, BU6424AF_SetI2Cclient, BU6424AF_Ioctl, BU6424AF_Release},#endif
}switch (a_u4Command)case AFIOC_S_SETDRVNAME: //设置名字和把变量传入具体驱动i4RetValue = AF_SetMotorName((__user stAF_MotorName *)(a_u4Param));copy_from_user(&stMotorName , pstMotorName, sizeof(stAF_MotorName) //用户空间拷贝数据for (i = 0; i < MAX_NUM_OF_LENS; i++)if (strcmp(stMotorName.uMotorName, g_stAF_DrvList[i].uDrvName) == 0) //如果名字相同g_pstAF_CurDrv = &g_stAF_DrvList[i]; //设置当前设备g_pstAF_CurDrv->pAF_SetI2Cclient(g_pstAF_I2Cclient, &g_AF_SpinLock, &g_s4AF_Opened); //调用具体lens的pAF_SetI2CclientDW9714AF_SetI2Cclient //比如DW9714AF马达g_pstAF_I2Cclient = pstAF_I2Cclient;  //保存传进来的client指针，以后就可以在具体驱动中修改main_af的东西了g_pAF_SpinLock = pAF_SpinLock;g_pAF_Opened = pAF_Opened;  //open标志位default:i4RetValue = g_pstAF_CurDrv->pAF_Ioctl(a_pstFile, a_u4Command, a_u4Param); //调用具体驱动的ioctl四.具体AF驱动分析：DW9714AF为例DW9714AF.c (kernel-3.18\drivers\misc\mediatek\lens\common\dw9714af)
主要是ioctl分析
DW9714AF_Ioctlswitch (a_u4Command)case AFIOC_G_MOTORINFO: //获取一些信息，比如位置getAFInfo((__user stAF_MotorInfo *) (a_u4Param));case AFIOC_T_MOVETO:  //驱动到马达到具体位置i4RetValue = moveAF(a_u4Param); ret = s4AF_ReadReg(&InitPos); //单独分析1g_pstAF_I2Cclient->addr = AF_I2C_SLAVE_ADDR; case AFIOC_T_SETINFPOS: //设置AF的位置i4RetValue = setAFInf(a_u4Param);g_u4AF_INF = a_u4Position; /case AFIOC_T_SETMACROPOS: //设置AF最大的移动位置i4RetValue = setAFMacro(a_u4Param);g_u4AF_MACRO = a_u4Position; //单独分析1
ret = s4AF_ReadReg(&InitPos);g_pstAF_I2Cclient->addr = AF_I2C_SLAVE_ADDR;  //当前驱动的I2C地址g_pstAF_I2Cclient->addr = g_pstAF_I2Cclient->addr >> 1; i4RetValue = i2c_master_recv(g_pstAF_I2Cclient, pBuff, 2); /读写I2C