Create GPIO on x86

I have a Packard Bell iMedia S2883 with two GPIO available on the motherboard and the power led is also controllable via GPIO.
How do I define this in x86?
Of course, I can export the GPIO to sysfs. But, how do I get the correct names?
Can I create a DTS file for x86?

 gpio-465 (it87_gp31           |sysfs               ) out hi
 gpio-466 (it87_gp32           |sysfs               ) out hi
 gpio-472 (it87_gp40           |sysfs               ) out hi