IBM/Lenovo Thinkpad trackpoint support in pms(4)?

[Peter Piwowarski]

Hello,

pms(4) currently seems to have no particular support for the trackpoint 
devices on Thinkpads. These support some extensions to the PS/2 
protocol, to do things like configure the device's sensitivity. What can 
be done to add support for this to OpenBSD? IBM provides (or provided) 
some fairly detailed docs[1], and there is a driver in linux[2][3]. I'd 
be interested in attacking this myself, but I have no experience with 
kernel hacking and don't really know how to begin. I can provide dmesg 
for systems with trackpoint and touchpad and for systems without a 
touchpad, if anyone is interested.

[1] 
http://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html

[2] 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/input/mouse/trackpoint.h?id=HEAD

[3] 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/input/mouse/trackpoint.c?id=HEAD