unobstructed access to the underlying serio port via a char
       device. The driver tries to register char device 10,1
       (/dev/psaux) first and if it fails goes for dynamically
       allocated minor. To bind use sysfs interface:

       echo -n "serio_raw" > /sys/bus/serio/devices/serioX/driver
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>