mtk camera上电分析

mt6739 kernel4.4 方案

kernel部分：

涉及文件:kernel-4.4\drivers\misc\mediatek\imgsensor\src\mt6739\camera_hw\imgsensor_cfg_table.c,gpio,mclk上电信息dts配置信息
                 kernel-4.4\drivers\misc\mediatek\imgsensor\src\common\v1\imgsensor_hw.c,imgsensor.c,imgsensor_sensor_list.c
开机加载的初始化信息，项目只用到后置主摄，所以其他的管脚没有配置，执行camera_hw目录下的文件

camera驱动文件大概执行流程：主要执行 kernel-4.4\drivers\misc\mediatek\imgsensor\src\common\v1\目录下
imgsensor.c→imgsensor_sensor_list.c获取camera设备信息
imgsensor.c→imgsensor_hw.c→imgsensor_cfg_table.c（获取平台上电信息）

下面详细分析：
1：imgsensor_sensor_list.c存放sensor的id，gc5025的驱动信息
 

struct IMGSENSOR_INIT_FUNC_LIST kdSensorList[MAX_NUM_OF_SUPPORT_SENSOR] = {
	
#if defined(GC5025_MIPI_RAW)
    {GC5025_SENSOR_ID, SENSOR_DRVNAME_GC5025_MIPI_RAW, GC5025MIPI_RAW_SensorInit},
#endif

	/*  ADD sensor driver before this line */
	{0, {0}, NULL}, /* end of list */
};

struct IMGSENSOR_INIT_FUNC_LIST {
	MUINT32   id;
	MUINT8    name[32];
	MUINT32 (*init)(PSENSOR_FUNCTION_STRUCT *pfFunc);
};

2：imgsensor.c的imgsensor_set_driver调用kdSensorList获取设备信息，这步猜测是机器上电就获取camera设备
  获取设备后，还进行一下硬件初始化

3.这里是vendor\mediatek\proprietary\hardware\mtkcam\drv\src\sensor\common\v1\imgsensor_drv.cpp 的searchSensor接口调用，就是开机过程中，vendor会寻找Sensor，并对它做些硬件初始化

 

 4.imgsensor.c通过调用imgsensor_hw.c的imgsensor_hw_power获取上电的步骤，其中imgsensor_hw.c的imgsensor_hw_power是调用imgsensor_cfg_table.c的platform_power_sequence，sensor_power_sequence

imgsensor_hw.c文件的imgsensor_hw_power函数

5.imgsensor_cfg_table.c文件的platform_power_sequence跟sensor_power_sequence

 

上下电相关：

6：imgsensor.c通过adopt_CAMERA_HW_FeatureControl跟用户进行通信：
vendor\mediatek\proprietary\hardware\mtkcam\drv\src\sensor\common\v1\imgsensor_drv.cpp
SENSOR_FEATURE_OPEN上电拍照   SENSOR_FEATURE_CLOSE关闭

 

 

 其实就是gpimgsensor_cdev设备驱动的imgsensor_ioctl控制，里面还有一些awb,af接口

拍照的串口log