SCSI CDROM support

modulename: sr_mod.ko

and/or

cdrom.ko

configname: CONFIG_BLK_DEV_SR

Linux Kernel Configuration
└─>Device Drivers
└─>SCSI device support
└─>SCSI CDROM support
In linux kernel since version 2.6.12  
If you want to use a CD or DVD drive attached to your computer
by SCSI, FireWire, USB or ATAPI, say Y and read the SCSI-HOWTO
and the CDROM-HOWTO at <http://www.tldp.org/docs.html#howto>.

Make sure to say Y or M to "ISO 9660 CD-ROM file system support".

To compile this driver as a module, choose M here and read
Documentation/scsi/scsi.txt.
The module will be called sr_mod.

source code:
selects

CONFIG_CDROM

depends
CONFIG_SCSI or CONFIG_BLK_DEV or &