Say Y here if you want to support user level drivers for serio
subsystem accessible under char device 10:240 - /dev/userio. Using
this facility userspace programs can implement serio ports that
will be used by the standard in-kernel serio consumer drivers,
such as psmouse and atkbd.
To compile this driver as a module, choose M here: the module will be
called userio.
If you are unsure, say N.