kern/48116: Support for Synaptics touchpad

[Rahul Siddharthan]

"David E. O'Brien" said:
> Do you have a new tested patch that applies against 5.2-CURRENT?
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=48116

One was posted on -current a few days ago. See
http://lists.freebsd.org/pipermail/freebsd-current/2004-January/017689.html

I have a patch too, which I'll post on request, but it's basically the same.

I have the following issues with it:

1. It worked perfectly on my old laptop, but on my current laptop it doesn't
detect the touchpad as a synaptics (it detects it as Microsoft Intellimouse)
unless I change the order of probing in psm.c .

2. The scrollbar (mousewheel-substitute along right of touchpad) on my present
laptop doesn't work.  Without the patch, it has no effect; with the patch, it
yields normal cursor up-down movement, and no left-right movement, no wheel
effect.  I plan to investigate further in a few days time.

Others pointed out issues with this patch too: see 

http://lists.freebsd.org/pipermail/freebsd-current/2004-January/017782.html