In article <20051123093802.B63E12DA27@cvs.netbsd.org>
augustss@NetBSD.org wrote:

> Module Name:	src
> Committed By:	augustss
> Date:		Wed Nov 23 09:38:02 UTC 2005
> 
> Modified Files:
> 	src/sys/dev/wscons: wsconsio.h wsmouse.c wsmousevar.h
> 
> Log Message:
> Some devices provide more than three (X, Y, and Z) "directions".  So add
> a W "coordinate" that can be used for these.
> This changes the type of wsmouse_input().  To avoid changing a lot of drivers
> a compatibilty #define is provided.  Maybe changing all drivers would have
> been better?

IMHO, it's always better to define API first and then modify drivers.
wsmouse(4) API looks a bit ugly already though...
---
Izumi Tsutsui