高通msm8917 37 40（android 7.1） 摄像头框架调用流程

以问答的形式来理解摄像头框架流程

问：aw_camera.xml中配置的多个摄像头在哪里匹配？

答：sensor.c(vendor)通过iotcl到底层在msm_sensor_driver_probe去获取dtsi中配置的g_sctrl

kernel\msm-3.18\drivers\media\platform\msm\camera_v2\sensor\msm_sensor_init.c

msm_sensor_init_subdev_do_ioctl -> msm_sensor_init_subdev_ioctl -> msm_sensor_driver_cmd -> msm_sensor_driver_probe

 

问：g_sctrl里面的值什么时候赋值？

答：通过平台driver进来解析dts时复制

kernel\msm-3.18\drivers\media\platform\msm\camera_v2\sensor\msm_sensor_driver.c

msm_sensor_driver_platform_probe -> msm_sensor_driver_parse -> msm_sensor_driver_get_dt_data

 

问：g_sctrl里面的sensor_i2c_client内容关于i2c通讯部分哪里来的？

答：camera_v2\sensor\cci\msm_cci.c中通过platform_driver_register获取i2c相关的配置，msm_sensor_driver_platform_probe里面会对g_sctrl里面的内容都填充

msm_sensor_driver_platform_probe -> msm_sensor_driver_parse -> msm_sensor_init_default_params -> s_ctrl->sensor_i2c_client->i2c_func_tbl =

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