Re: [PATCH 2.6.11-rc3] IBM Trackpoint support

Vojtech Pavlik
2005-02-13T19:31:20Z

On Sun, Feb 13, 2005 at 02:13:15PM -0500, Stephen Evanchik wrote:

> On Thu, 3 Feb 2005 22:52:44 -0500, Dmitry Torokhov
> <dtor_core@ameritech.net> wrote:
> > OK, I have read the code once again, and saw that you have special
> > handling within PS/2 protocol based on model constant. Please set
> > psmouse type to PSMOUSE_TRACKPOINT instead of model and provide full
> > protocol handler, like ALPS, Synaptics and Logitech do. Trackpoint
> > is different and complex enough to warrant it.
>
> I'm not sure that I think a protocol handler is necessary unless I am
> misunderstanding what you mean. The TrackPoint is nothing more than a
> PS/2 mouse with 2 or 3 buttons that responds to an additional set of
> commands. The extra handling has to do with middle-to-scroll which
> could be done in userspace.
>
> Aside from that the only time TracKPoint specific processing occurs is
> when some property is being manipulated.
>
> Do you still think a custom handler is necessary?

You're right. The IBM trackpoints unfortunately don't have a 'native'
mode, they always do full processing and send classic PS/2 packets.

I think we shouldn't need a handler, since we can use the PS/2 protocol
one. We'll need some options to set the trackpoint tap behavior (as far
as I know it can only be mapped to a button), and we'll need a safe
detection, but that's all.

--
Vojtech Pavlik
SuSE Labs, SuSE CR