Serial port line discipline

modulename: serport.ko

configname: CONFIG_SERIO_SERPORT

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Hardware I/O ports
└─>Serial port line discipline
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Say Y here if you plan to use an input device (mouse, joystick,
tablet, 6dof) that communicates over the RS232 serial (COM) port.

More information is available: Documentation/input/input.txt

If unsure, say Y.

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

source code: