moxa-it87-gpio-driver

https://github.com/torvalds/linux/blob/v5.2/drivers/gpio/gpio-it87.c

Install required packages

make, linux-headers-<KERNEL_RELEASE>

apt install --no-install-recommends -qqy make
apt install --no-install-recommends -qqy linux-headers-$(uname -r)

Build package

1. Run make to build kernel module
2. Once build successful, gpio-it87.ko could be found under current directory