Grouping GPI for readback with interupt GPO

Hi I am using the ADAU 1442 in a NON standalone application

I want to use the GPO pins to be readback into the MCU as a kind of I/O expander for the MCU

I would Prefer that all GPI inputs are accumulated into a single Readback resister and a GPO gets set when ever there is a Change to this register as an Interrupt to the MCU.

Is there any examples available for this?

Thanks

Brett