MTK CAMERA Development

硬件环境：MTK6735 & 触摸屏是GT9271

软件环境：Linux内核3.10 & 安卓5.1

1、GPIO配置

（1）打开kernel-3.10/tools/dct/DrvGen.exe 

（2）修改kernel-3.10/drivers/misc/mediatek/mach/mt6735/${project}/dct/dct/codegen.dws

（3）配置两个摄像头的reset和powerdown的管脚。

2、camera移植

（1）修改<kernel>/arch/arm/configs/<project>_debug_defconfig 中添加

CONFIG_CUSTOM_KERNEL_IMGSENSOR="ov8858_mipi_raw  s5k3h5_mipi_raw"

修改device/rq/<project>/ProjectConfig.mk或device/mediatek/<project>/ProjectConfig.mk

imgsensor相关：

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1. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_IMGSENSOR = ov8858_mipi_raw s5k3h5_mipi_raw  
2. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_MAIN_IMGSENSOR = ov8858_mipi_raw  
3. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_SUB_IMGSENSOR = s5k3h5_mipi_raw  
4.   
5. <span style="white-space:pre;"> </span>CUSTOM_HAL_IMGSENSOR = ov8858_mipi_raw s5k3h5_mipi_raw  
6. <span style="white-space:pre;"> </span>CUSTOM_HAL_MAIN_IMGSENSOR = ov8858_mipi_raw  
7. <span style="white-space:pre;"> </span>CUSTOM_HAL_SUB_IMGSENSOR = s5k3h5_mipi_raw  

lens相关：（没有自动对焦AF或刚开始port sensor（移植）测试时，则配置成傻瓜dummy_lens）

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1. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_LENS = ad5820af dw9714af dummy_lens  
2. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_MAIN_LENS = dw9714af  
3. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_SUB_LENS = dummy_lens  
4.   
5. <span style="white-space:pre;"> </span>CUSTOM_HAL_LENS = ad5820af dw9714af dummy_lens  
6. <span style="white-space:pre;"> </span>CUSTOM_HAL_MAIN_LENS = dw9714af  
7. <span style="white-space:pre;"> </span>CUSTOM_HAL_SUB_LENS = dummy_lens  

flashlight相关：(port sensor初期可设置为dummy_flashlight）

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1. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_FLASHLIGHT = constant_flashlight  
2. <span style="white-space:pre;"> </span>CUSTOM_HAL_FLASHLIGHT = dummy_flashlight  

OTP (One Time Programmable） 相关：（仅RAW sensor使用）

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1. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_CAM_CAL = dummy_eeprom  
2. <span style="white-space:pre;"> </span>CUSTOM_KERNEL_EEPROM = dummy_eeprom  
3.   
4. <span style="white-space:pre;"> </span>CUSTOM_HAL_CAM_CAL = dummy_eeprom  
5. <span style="white-space:pre;"> </span>CUSTOM_HAL_EEPROM = dummy_eeprom  

（2）把kernel层的代码ov8858_mipi_raw和s5k3h5_mipi_raw文件夹拷贝到

kernel-3.10/drivers/misc/mediatek/imgsensor/src/mt6735/下在（注意文件夹名字的格式）

（3）将hal层代码整个目录ov8858_mipi_raw  s5k3h5_mipi_raw拷贝到vendor/mediatek/proprietary/custom/mt6735/hal/D1/imgsensor/目录下；

（4）修改kernel-3.10/drivers/misc/mediatek/imgsensor/src/mt6735/Makefile

（5）打开kernel-3.10/drivers/misc/mediatek/imgsensor/inc/kd_imgsensor.h文件， 定义sensor id和sensor name

(并且inc下所有的文件必须拷贝到vendor/mediatek/proprietary/custom/kernel/imgsensor/inc/,这是用户空间可以访问到的目录)

(注意保持队形)

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1. <span style="white-space:pre;"> </span>#define OV8858_SENSOR_ID                        0x8858  
2.     #define S5K3H5XA_SENSOR_ID                      0x3085  
3.         #define SENSOR_DRVNAME_S5K3H5_MIPI_RAW         "s5k3h5mipiraw"  
4.     #define SENSOR_DRVNAME_OV8858_MIPI_RAW          "ov8858mipiraw"  

（6）在kernel-3.10/drivers/misc/mediatek/imgsensor/src/mt6735/kd_sensorlist.h文件中声明初始化函数；

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1. <span style="white-space:pre;"> </span>UINT32 OV8858_MIPI_RAW_SensorInit(PSENSOR_FUNCTION_STRUCT *pfFunc);  

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1. <span style="white-space:pre;"> </span>UINT32 S5K3H5XA_MIPI_RAW_SensorInit(PSENSOR_FUNCTION_STRUCT *pfFunc);  

如果是YUV sensor,则需要把MIPI_RAW改成YUV

在kdSensorList数组中添加：

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1. <span style="white-space:pre;"> </span>#if defined(OV8858_MIPI_RAW)    //该宏为驱动目录名大写  
2.     <span style="white-space:pre;">     </span>{OV8858_SENSOR_ID, SENSOR_DRVNAME_OV8858_MIPI_RAW,OV8858_MIPI_RAW_SensorInit},  
3. <span style="white-space:pre;"> </span>#endif  
4. <span style="white-space:pre;"> </span>#if defined(S5K3H2YX_MIPI_RAW)  //该宏为驱动目录名大写  
5.     <span style="white-space:pre;">     </span>{S5K3H2YX_SENSOR_ID, SENSOR_DRVNAME_S5K3H2YX_MIPI_RAW, S5K3H2YX_MIPI_RAW_SensorInit},  
6. <span style="white-space:pre;"> </span>#endif  

（7） 在kernel-3.10/drivers/misc/mediatek/imgsensor/src/sensorlist.cpp文件的SensorList数组中添加

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1. <span style="white-space:pre;"> </span>#if defined(OV8858_MIPI_RAW)     
2.             RAW_INF(OV8858_SENSOR_ID, SENSOR_DRVNAME_OV8858_MIPI_RAW,OV8858_MIPI_RAW_SensorInit),  
3.     #endif  
4.     #if defined(S5K3H2YX_MIPI_RAW)   
5.             RAW_INF(S5K3H2YX_SENSOR_ID, SENSOR_DRVNAME_S5K3H2YX_MIPI_RAW, S5K3H2YX_MIPI_RAW_SensorInit),  
6.     #endif  

（8）如果有AF时，需要修改vendor/mediatek/proprietary/custom/mt6735/hal/D1/lens/src/lenslist.cpp中lenslist[] (只需修改红色)

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1. <span style="white-space:pre;"> </span>#if defined(FM50AF)  
2.                 {<span style="color:#ff0000;">DUMMY_SENSOR_ID</span>, FM50AF_LENS_ID, "FM50AF", pFM50AF_getDefaultData},  
3.         #endif  

（9）修改上电时序

文件在kernel-3.10/drivers/misc/mediatek/mach/mt6735/rq6735_35gt_b_l1/camera/camera/kd_camera_hw.c

电源部分： VCAM_D就是DVDD数字供电,主要给ISP供电,如果是RAWDATA格式的sensor其ISP是在BB端,所以将其引脚将其NC；

VCAM_IO就是VDDIO数字IO电源主要给I2C部分供电；即DOVDD

VCAM_A就是AVDD模拟供电,主要给感光区和ADC部分供电;

VCAM_AF是对Camera自动对焦马达的供电 ，一半是最后给电

引脚部分： Reset引脚和powerdown引脚

其中XSHUTDN是通过下拉电阻实现置低的reset

根据datasheet上电时序：VCAM_A-》VCAM_IO-》PDN高-》VCAM_D-》RST高-》VCAM_AFO-》PDN高-》RST高

注意：这部分的驱动都有两套路径，此处列出的都是platform路径下的，但是project完整路径下如果也有，project路径下的优先权更高：

kernel-3.10/drivers/misc/mediatek/mach/mt6735/<project>/imgsensor/

vendor/mediatek/proprietary/custom/<project>/hal/D1/imgsensor/