MT8766 Android13 Camera GC02M1驱动获取sensor_id流程_gc02m1 msm8953

个人学习总结记录，有错误望指正

在配置这个驱动的过程中，设备名称和ID配置无误的前提下，我们能成功加载进GC02M1的驱动文件，但是获取sensor_id异常，从后往前进行一个添加log排查，自己梳理一遍

1、进入初始化后调用sensor_func结构体，进行一个初始化配置

UINT32 GC02M1MIPI_RAW_SensorInit(struct SENSOR_FUNCTION_STRUCT **pfFunc)
{
    /* To Do : Check Sensor status here */
    if (pfFunc != NULL)
    {
        printk("GC02M1MIPI_RAW_SensorInit\n");
        *pfFunc = &sensor_func;
    }
    return ERROR_NONE;
}
 
static struct SENSOR_FUNCTION_STRUCT sensor_func = {
    open,
    get_info,
    get_resolution,
    feature_control,        //在这里获取sensor id
    control,
    close
};

2、查看这个 feature_control() 函数

static kal_uint32 feature_control(MSDK_SENSOR_FEATURE_ENUM feature_id,
    UINT8 *feature_para, UINT32 *feature_para_len)
{
        ...
    UINT32 *feature_return_para_32 = (UINT32 *)feature_para;
//通过这个switch选择，匹配成功后，调用get_imgsensor_id()函数，去获取id
    switch (feature_id) {
        ...
        case SENSOR_FEATURE_CHECK_SENSOR_ID:
            get_imgsensor_id(feature_return_para_32);
            break;
        ...
    }
}

3、继续跟这个 get_imgsensor_id() 函数的参数来源

static kal_uint32 get_imgsensor_id(UINT32 *sensor_id)
{
    kal_uint8 i = 0;
    kal_uint8 retry = 2;
//打印结果：gc02m1 get_imgsensor_id,0x0
    printk("gc02m1 %s,0x%x\n ",__func__,*sensor_id);
/*
循环遍历这个iic列表
static struct imgsensor_info_struct imgsensor_info = {
    .i2c_addr_table = {0x6e, 0x20, 0xff},
    .i2c_speed = 400,
};
*/
    while (imgsensor_info.i2c_addr_table[i] != 0xff) {
        spin_lock(&imgsensor_drv_lock);
        imgsensor.i2c_write_id = imgsensor_info.i2c_addr_table[i];
        printk("gc02m1 imgsensor i2c_write_id : 0x%x", imgsensor.i2c_write_id);
        spin_unlock(&imgsensor_drv_lock);
        do {
/*
通过这个函数，返回sensor id
打印结果：gc02m1 return_sensor_id : 0x0
在这里没有获取到正确的id
*/
            *sensor_id = return_sensor_id();
            printk("gc02m1 return_sensor_id : 0x%x" , *sensor_id);
            if (*sensor_id == imgsensor_info.sensor_id) {
                printk("GC02M1(YH&YJ&YK&YC) i2c write id: 0x%x, sensor id: 0x%x\n", imgsensor.i2c_write_id, *sensor_id);
                return ERROR_NONE;
            }
            printk("Read sensor id fail, write id: 0x%x, id: 0x%x\n", imgsensor.i2c_write_id, *sensor_id);
            retry--;
        } while (retry > 0);
        i++;
        retry = 2;
    }
/*
这里ID不一致
打印log为：gc02m1 sensor_id : 0x0  imgsensor_info.sensor_id : 0x2e0
*/
    if (*sensor_id != imgsensor_info.sensor_id) {
        /* if Sensor ID is not correct, Must set *sensor_id to 0xFFFFFFFF */
        printk("gc02m1 sensor_id : 0x%x  imgsensor_info.sensor_id : 0x%x\n",*sensor_id,imgsensor_info.sensor_id);
        *sensor_id = 0xFFFFFFFF;
        return ERROR_SENSOR_CONNECT_FAIL;
    }
    return ERROR_NONE;
}

4、继续跟进 return_sensor_id() 函数

static kal_uint32 return_sensor_id(void)
{
    return ((read_cmos_sensor(0xf0) << 8) | read_cmos_sensor(0xf1));
}

static kal_uint16 read_cmos_sensor(kal_uint32 addr)
{
    kal_uint16 get_byte = 0;
    char pu_send_cmd[1] = {(char)(addr & 0xff)};
//这里通过这个函数，读取iic里面信息，来往get_byte里面写值
    iReadRegI2C(pu_send_cmd, 1, (u8 *)&get_byte, 1, imgsensor.i2c_write_id);
    printk("gc02m1 get_byte : %d\n",get_byte);
 
    return get_byte;
}

关于iReadRegI2C函数，在文件eeprom_i2c_custom_driver.c中

文件位置：

/mtk8766/alps/s0_vnd/kernel-4.19/drivers/misc/mediatek/cam_cal/src/mt6761/eeprom_i2c_custom_driver.c

5、在kernel层的 imgsensor.c 中，判断是否存在该sensor id

static inline int imgsensor_check_is_alive(struct IMGSENSOR_SENSOR *psensor)
{
        ...
    IMGSENSOR_PROFILE_INIT(&psensor_inst->profile_time);
 
//摄像头上电
    err = imgsensor_hw_power(&pgimgsensor->hw,
                psensor,
                psensor_inst->psensor_name,
                IMGSENSOR_HW_POWER_STATUS_ON);
 
    if (err == IMGSENSOR_RETURN_SUCCESS)
        imgsensor_sensor_feature_control(
            psensor,
            SENSOR_FEATURE_CHECK_SENSOR_ID,
            (MUINT8 *)&sensorID,
            &retLen);
/*
这里判断sensorid是否存在，如果存在，那么久将其打印出来
这里打印log信息为：gc02m1 Fail to get sensor ID ffffffff
*/
    if (sensorID == 0 || sensorID == 0xFFFFFFFF) {
        printk("gc02m1 Fail to get sensor ID %x\n", sensorID);
        err = ERROR_SENSOR_CONNECT_FAIL;
    } else {
        printk("gc02m1 and s5k5e8yx Sensor found ID = 0x%x\n", sensorID);
        err = ERROR_NONE;
    }
 
    if (err != ERROR_NONE)
        printk("gc02m1 ERROR: No imgsensor alive\n");
 
//下电
    imgsensor_hw_power(&pgimgsensor->hw,
        psensor,
        psensor_inst->psensor_name,
        IMGSENSOR_HW_POWER_STATUS_OFF);
     ...
}

原因排查：iic不通

检查上电时序

内容无误，但是ID配置错误！修改后获取sensor_id正常，前置正常开启

#if defined(GC02M1_MIPI_RAW)
    {
-        SENSOR_DRVNAME_GC02M1MIPI_RAW,
+        SENSOR_DRVNAME_GC02M1_MIPI_RAW,
        {
            {PDN, Vol_Low, 0},
            {RST, Vol_Low, 0},
            {AVDD, Vol_2800, 2},
            {DOVDD, Vol_1800, 2},
            {DVDD, Vol_1800, 2},
            {SensorMCLK, Vol_High, 1},
            {PDN, Vol_High, 2},
            {RST, Vol_High, 10}
        },
    },
#endif

也希望大家在排查的时候，先确保这些基础信息正常！