Android-sensor Hal layer startup sequence

During system initialization, open_sensors () at the Hal layer will be called to register all callback functions;

The system then calls the control _ open_data_source () function when the sensor module is opened. This function will open the device node of the sensor and negotiate with the hardware. If the sensor module is opened successfully, the system returns the device node that is opened.

FD, to set_activity, set_delay... if it fails, null must be returned. If it fails, no other callback functions will be called. This function will not be called again until the APK registers the sensor module...

 

After the callback function is successfully enabled, call the registered callback function in the following order: