default or selected kernelversion does not have config value CONFIG_CDU31A.
Result is shown for kernelversion 5.15.113

Sony CDU31A/CDU33A CDROM support

modulename: cdu31a.ko

configname: CONFIG_CDU31A

Linux Kernel Configuration
└─>Device Drivers
└─>Old CD-ROM drivers (not SCSI, not IDE)
└─>Sony CDU31A/CDU33A CDROM support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
These CD-ROM drives have a spring-pop-out caddyless drawer, and a
rectangular green LED centered beneath it. NOTE: these CD-ROM
drives will not be auto detected by the kernel at boot time; you
have to provide the interface address as an option to the kernel at
boot time as described in Documentation/cdrom/cdu31a or fill
in your parameters into <file:drivers/cdrom/cdu31a.c>. Try "man
bootparam" or see the documentation of your boot loader (lilo or
loadlin) about how to pass options to the kernel.

If you say Y here, you should also say Y or M to "ISO 9660 CD-ROM
file system support" below, because that's the file system used on

To compile this driver as a module, choose M here: the
module will be called cdu31a.

source code: