default or selected kernelversion does not have config value CONFIG_STALLION.
Result is shown for kernelversion 5.6.18

Stallion EasyIO or EC8/32 support

modulename: stallion.ko

configname: CONFIG_STALLION

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Stallion EasyIO or EC8/32 support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you have an EasyIO or EasyConnection 8/32 multiport Stallion
card, then this is for you; say Y. Make sure to read
Documentation/serial/stallion.txt.

To compile this driver as a module, choose M here: the
module will be called stallion.

source code: