Wheel mice on thinkpad ps/2

[Allan Sandfeld Jensen <snowwolf@one2one-networks.com>]

Hi.
I've solved a long standing problem with using an extended mouse over the 
ps/2 port on a thinkpad.  (search deja, I found bugreports dating back to 
1998, all unanswered)
I discovered there is a "smart" device called a trackpoint controller, that 
accumulates movement from both the trackpoints and the external mouse. 
Provided it understands the external mouse! (it only understand standard 
mice) A quick hack is disabling the trackpoint controller by sending 0xe2 
0x4e, but a more general solution would be to write a linux driver that 
autodetected a trackpoint controller with external mouse and disabled it.  In 
that way it would be transparant to userspace drivers.

The easiest for my would be writing it into pc_keyb.c but that's not 
appropiate. So where should I place the driver? 
If I want advanced functionality, where I instead demultiplexes the 
trackpoint and the external mouse into a /dev/psaux1 and -2, I need to take 
over the aux interrupthandler. Otherwise I can just speak through the 
standard psaux. 
And what of the new input-class, should all inputdevices eventually move over 
there, or just USB? 

regards
-Allan