default or selected kernelversion does not have config value CONFIG_CARDMAN_4000.
Result is shown for kernelversion 6.9.9

Omnikey Cardman 4000 support

modulename: cm4000_cs.ko

configname: CONFIG_CARDMAN_4000

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>PCMCIA character devices
└─>Omnikey Cardman 4000 support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable support for the Omnikey Cardman 4000 PCMCIA Smartcard
reader.

This kernel driver requires additional userspace support, either
by the vendor-provided PC/SC ifd_handler (http://www.omnikey.com/),
or via the cm4000 backend of OpenCT (http://www.opensc-project.org/opensc).

source code: