default or selected kernelversion does not have config value CONFIG_KEYBOARD_MCS.
Result is shown for kernelversion 6.9.9

MELFAS MCS Touchkey

modulename: mcs_touchkey.ko

configname: CONFIG_KEYBOARD_MCS

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Keyboards
└─>MELFAS MCS Touchkey
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
Say Y here if you have the MELFAS MCS5000/5080 touchkey controller
chip in your system.

If unsure, say N.

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

source code: