default or selected kernelversion does not have config value CONFIG_CARDMAN_4040.
Result is shown for kernelversion 6.9.9

Omnikey CardMan 4040 support

modulename: cm4040_cs.ko

configname: CONFIG_CARDMAN_4040

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>PCMCIA character devices
└─>Omnikey CardMan 4040 support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable support for the Omnikey CardMan 4040 PCMCIA Smartcard
reader.

This card is basically a USB CCID device connected to a FIFO
in I/O space. To use the kernel driver, you will need either the
PC/SC ifdhandler provided from the Omnikey homepage
(http://www.omnikey.com/), or a current development version of OpenCT
(http://www.opensc-project.org/opensc).

source code:
depends
CONFIG_PCMCIA