Auto Iris and Auto focus with Hi3516c/Hi3518c ISP.

Hello friends!

I need some help. I am using DongFeng (XM) cameras from the market. I have model with hi3516c and IMX122/222.
This model doesn`t have focus/zoom/iris control for motorized lenses.
So, I have made board with such control. Board is connecting to camera via USB as serial device. So, I have /dev/ttyUSB0 in my system.
Boar recognize some command, like focus +1 / zoom -1 / iris +1.
Now I want to start AI ISP algo and somehow get instructions from ISP to control IRIS  and Focus.
I can`t find any documentation about how to do this. It seems there are some predefined pins of Hi3516c SoC that must be connected to Iris/Focus motors. Is it true?

Are there any chance get some kind of instructions from ISP to control focus and Iris by myself? How to do this? Do I need some thread for this?

By the way, are there any Hisi developers in Shenzhen or Hefei? Maybe it is possible to have meeting with somebody and talk (experience exchange)?