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MTK6577---camera驱动分析

發布時間：2023/12/16 编程问答 28 豆豆

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?MTK6577---camera驅動分析?2013-11-21 15:34:31

分類：?Android平臺

一.camera驅動的初始化
1. 支持的攝像頭列表
在./mediatek/config/mobitek77_m01_ics2/ProjectConfig.mk中,
配置支持的攝像頭驅動

CUSTOM_HAL_IMGSENSOR=ov5640_yuv s5k4e1ga_raw ov5647_raw gc2035_yuv gc0329_yuv

CUSTOM_HAL_MAIN_IMGSENSOR=ov5640_yuv s5k4e1ga_raw ov5647_raw #gc2035_yuv

CUSTOM_HAL_SUB_IMGSENSOR=gc2035_yuv gc0329_yuv

CUSTOM_KERNEL_IMGSENSOR=ov5640_yuv s5k4e1ga_raw ov5647_raw gc2035_yuv gc0329_yuv

CUSTOM_KERNEL_SUB_IMGSENSOR=gc2035_yuv gc0329_yuv

在 custom/common/kernel/imgsensor/src/kd_sensorlist.h或
在source/external/mhal/src/custom/common/kernel/imgsensor/kd_sensorlist.h 中

ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT kdSensorList[]?=

{

#if?defined(GC2035_YUV)

????????{GC2035_SENSOR_ID,?SENSOR_DRVNAME_GC2035_YUV,?GC2035_YUV_SensorInit},

#endif

#if?defined(OV5640_YUV)

????{OV5640_SENSOR_ID,?SENSOR_DRVNAME_OV5640_YUV,?OV5640_YUV_SensorInit},

#endif

????{0,{0},NULL},

};

2. module_init
在mediatek\custom\common\kernel\imgsensor\src\kd_sensorlist.c中
module_init(CAMERA_HW_i2C_init);
//文件的開頭,先聲明I2C信息
static struct i2c_board_info __initdata kd_camera_dev={ I2C_BOARD_INFO("kd_camera_hw", 0xfe>>1)};

static?int?__init CAMERA_HW_i2C_init(void)

{

????//注冊i2c信息,下一步就可以調用i2c_add_driver

????i2c_register_board_info(CAMERA_I2C_BUSNUM,?&kd_camera_dev,?1);???

????//注冊platform_driver然后調用probe函數CAMERA_HW_probe

????platform_driver_register(&g_stCAMERA_HW_Driver);

??? //在proc目錄中創建/proc/driver/camsensor調試信息

????prEntry?=?create_proc_entry("driver/camsensor",?0,?NULL);

??? prEntry->read_proc?=?CAMERA_HW_DumpReg_To_Proc;

??? prEntry->write_proc?=?CAMERA_HW_Reg_Debug;

????

??? //全局變量的初始化

??? atomic_set(&g_CamHWOpend,?0);

????atomic_set(&g_CamDrvOpenCnt,?0);

????atomic_set(&g_CamHWOpening,?0);

}

3. Camera_hw_p
CAMERA_HW_i2C_init
??? --> platform_driver_register?
??????? -->?CAMERA_HW_probe
??????? --> i2c_add_driver
在mediatek\custom\common\kernel\imgsensor\src\kd_sensorlist.c中

static?int?CAMERA_HW_probe(struct platform_device?*pdev)

{

????//創建一個等侍隊列

????init_waitqueue_head(&kd_sensor_wait_queue);???????

????//注冊一個i2c驅動,然后調用i2c驅動的probe函數CAMERA_HW_i2c_probe

????return i2c_add_driver(&CAMERA_HW_i2c_driver);

}

4. Camera_hw_i2c_probe
CAMERA_HW_i2C_init
??? --> platform_driver_register?
??????? -->?CAMERA_HW_probe
??????? --> i2c_add_driver
??????????????? --> CAMERA_HW_i2c_probe
在mediatek\custom\common\kernel\imgsensor\src\kd_sensorlist.c中
static DEFINE_SPINLOCK(kdsensor_drv_lock);?//spin_lock的初始化是在全局變量中初始化的

static?int?CAMERA_HW_i2c_probe(struct i2c_client?*client,?const?struct i2c_device_id?*id)

{

????spin_lock(&kdsensor_drv_lock);???????????//加鎖

????g_pstI2Cclient?=?client;????????//獲取client

??? g_pstI2Cclient->timing?=?200;???//設置clock 200k

????spin_unlock(&kdsensor_drv_lock);?????????//解鎖

????i4RetValue?=?RegisterCAMERA_HWCharDrv();???//字符設備的初始化

}

4.1 字符設備初始化
#define CAMERA_HW_DRVNAME "kd_camera_hw"
static dev_t g_CAMERA_HWdevno = MKDEV(250,0);

inline static?int?RegisterCAMERA_HWCharDrv(void)

{

????struct device*?sensor_device?=?NULL;

#if?CAMERA_HW_DYNAMIC_ALLOCATE_DEVNO

????alloc_chrdev_region(&g_CAMERA_HWdevno,?0,?1,CAMERA_HW_DRVNAME);?//動態分配dev_no

#else

????register_chrdev_region(?g_CAMERA_HWdevno?,?1?,?CAMERA_HW_DRVNAME);????

#endif

????g_pCAMERA_HW_CharDrv?=?cdev_alloc();???????????????????//分配設備內存

????cdev_init(g_pCAMERA_HW_CharDrv,?&g_stCAMERA_HW_fops);??//初始化設備

????g_pCAMERA_HW_CharDrv->owner?=?THIS_MODULE;

????cdev_add(g_pCAMERA_HW_CharDrv,?g_CAMERA_HWdevno,?1))???//注冊設備

????//這樣就創建了結點/dev/kd_camera_hw

????sensor_class?=?class_create(THIS_MODULE,?"sensordrv");?????//與下一句一起創建設備結點

????sensor_device?=?device_create(sensor_class,?NULL,?g_CAMERA_HWdevno,?NULL,?CAMERA_HW_DRVNAME);

????

}

字符設備的文件操作

static?const?struct file_operations g_stCAMERA_HW_fops?=

{

????.owner?=?THIS_MODULE,

????.open?=?CAMERA_HW_Open,

????.release?=?CAMERA_HW_Release,

#ifdef HAL_CAMERA_COMPATIBLE

????.read?=?device_read,

#endif

????#ifdef USE_NEW_IOCTL

????.unlocked_ioctl?=?CAMERA_HW_Ioctl

????#else

????.ioctl?=?CAMERA_HW_Ioctl

????#endif

};

5. 字符設備的open與relase
open與relase函數啥也不作,只是把計數加1或減1

static?int?CAMERA_HW_Open(struct inode?*?a_pstInode,?struct file?*?a_pstFile)

{

????dbmsg("open");

????atomic_inc(&g_CamDrvOpenCnt);

????return 0;

}

release:

static?int?CAMERA_HW_Release(struct inode?*?a_pstInode,?struct file?*?a_pstFile)

{

????atomic_dec(&g_CamDrvOpenCnt);

????return 0;

}

5. 字符設備的read過程
在./mediatek/config/mobitek77_m01_ics2/ProjectConfig.mk中
CUSTOM_HAL_IMGSENSOR=ov5640_yuv s5k4e1ga_raw ov5647_raw? gc2035_yuv gc0329_yuv
在mediatek\custom\common\hal\imgsensor\src\sensorlist.cpp中

MSDK_SENSOR_INIT_FUNCTION_STRUCT SensorList[]?=

????#if?defined(OV5640_YUV)

????????YUV_INFO(OV5640_SENSOR_ID,?SENSOR_DRVNAME_OV5640_YUV,?NULL),

????#endif

????#if?defined(S5K4E1GA_RAW)

????????RAW_INFO(S5K4E1GA_SENSOR_ID,?SENSOR_DRVNAME_S5K4E1GA_RAW,?NULL),

????#endif

????#if?defined(OV5647_RAW)

????????RAW_INFO(OV5647_SENSOR_ID,?SENSOR_DRVNAME_OV5647_RAW,?NULL),

????#endif

????#if?defined(GC2035_YUV)????????????????????????????

????????YUV_INFO(GC2035_SENSOR_ID,?SENSOR_DRVNAME_GC2035_YUV,NULL),

????#endif

????#if?defined(GC0329_YUV)

????????YUV_INFO(GC0329_SENSOR_ID,?SENSOR_DRVNAME_GC0329_YUV,?NULL),

????#endif

????{0,{0},NULL,?NULL,?NULL}//end?of list

};

在mediatek\custom\common\kernel\imgsensor\src\kd_sensorlist.c

static ssize_t device_read(struct file?*filp,?char?*buffer,?size_t length,?loff_t?*offset)

{

????int?bytes_read?=?0;

????char i,k,j,g,err;

????char msg[2]={0};//"pangfei read test program";

????

????//查看sensorList中的支持的驅動數目

????k?=?sizeof(kdSensorList)/sizeof(ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT)?-?1;

????//尋找主攝像頭

????for(i=0;i<k;i++)?

????{

??????? kdSearchCameraDriver(i,DUAL_CAMERA_MAIN_SENSOR);?//5.1檢查是否有這個驅動的硬件

??????? msg[0]?=?i;

????????MainCameraDrvIdx?=?i;????//如果有將全局變量MainCameraDrvIdx設為找到的值,這兒為0?

????????break;???????????????????//這兒為0,即主攝像頭是在SensorList中的第0項:ov5640_yuv

?????}????????

????//尋找次攝像頭

????for(j=k-1;j>msg[0];j--)?

????{

????????err=kdSearchCameraDriver(j,DUAL_CAMERA_SUB_SENSOR);??//檢查是否有這個驅動的硬件

??????? msg[1]?=?j;

??????? SubCameraDrvIdx?=?j;?????//如果有將全局變量SubCameraDrvIdx設為找到的值,這兒為3
????????break;???????????????????//這兒為0,即次攝像頭是在SensorList中的第3項:gc2035_yuv??

????}

}

5.1 尋找驅動

static?int?kdSearchCameraDriver(char drvIdx,char index)

{

????ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT?*pSensorList?=?NULL;

??? kdGetSensorInitFuncList(&pSensorList));?//5.1.1由pSensorList獲取首地址

??? pSensorList[drvIdx].SensorInit(&g_pSensorFunc);???//調用具體硬件的SensorInit??????

??? CAMERA_HW_CheckIsAlive(index);????????????????????//5.1.2讀取sensorID是否正歷來判斷是否有這個驅動的硬件連上

}

5.1.1獲取sensorList的首地址

UINT32 kdGetSensorInitFuncList(ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT?**ppSensorList)

{

????*ppSensorList?=?&kdSensorList[0];

????return 0;

}

5.1.2讀取器件的SensorID來判斷是否有硬件連上

static?int?CAMERA_HW_CheckIsAlive(char index)

{

??? g_currDualSensorIdx?=?index;?//power?on?main?or?sub?sensor

????kdModulePowerOn((CAMERA_DUAL_CAMERA_SENSOR_ENUM)?g_currDualSensorIdx,?g_currSensorName,true,?CAMERA_HW_DRVNAME);

????mDELAY(10);

????//讀取SensorID

??? g_pSensorFunc->SensorFeatureControl(SENSOR_FEATURE_CHECK_SENSOR_ID,?(MUINT8*)&sensorID,?&retLen);

????if?(sensorID?==?0)?{?//如果讀取失敗,還有可能是沒有實現這個接口,再用SensorOpen試試??????????

??? ? ??err?=?g_pSensorFunc->SensorOpen();

????}

????else?if?(sensorID?==?0xFFFFFFFF)?{???????????

???????err?=?ERROR_SENSOR_CONNECT_FAIL;

????}

????else?{

???????????err?=?ERROR_NONE;

????}????

????kdModulePowerOn((CAMERA_DUAL_CAMERA_SENSOR_ENUM)?g_currDualSensorIdx,?NULL,?false,?CAMERA_HW_DRVNAME);

}

int?kdSetDriver(unsigned?int*?pDrvIndex)

{

????ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT?*pSensorList?=?NULL;

????unsigned?int?drvIdx?=?(*pDrvIndex?&?KDIMGSENSOR_DUAL_MASK_LSB);

????spin_lock(&kdsensor_drv_lock);

????g_currDualSensorIdx?=?(CAMERA_DUAL_CAMERA_SENSOR_ENUM)((*pDrvIndex?&?KDIMGSENSOR_DUAL_MASK_MSB)>>KDIMGSENSOR_DUAL_SHIFT);

????spin_unlock(&kdsensor_drv_lock);

??? kdGetSensorInitFuncList(&pSensorList);????

????k?=?sizeof(kdSensorList)/sizeof(ACDK_KD_SENSOR_INIT_FUNCTION_STRUCT)?-?1;

????if?(drvIdx?==?0)

????{

????????drvIdx?=?MainCameraDrvIdx;

????????pSensorList[drvIdx].SensorInit(&g_pSensorFunc);?????//調用init獲取具體驅動的函數指針

????????memcpy((char*)g_currSensorName,(char*)pSensorList[drvIdx].drvname,sizeof(pSensorList[drvIdx].drvname));

????????*pDrvIndex?=?(unsigned?int)pSensorList[drvIdx].SensorId;???????

????}

????else

????{???????

????????drvIdx?=?SubCameraDrvIdx;

??????? pSensorList[drvIdx].SensorInit(&g_pSensorFunc);?????//調用init獲取具體驅動的函數指針

????????memcpy((char*)g_currSensorName,(char*)pSensorList[drvIdx].drvname,sizeof(pSensorList[drvIdx].drvname));

????????*pDrvIndex?=?(unsigned?int)pSensorList[drvIdx].SensorId;

????}

}

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