Re: [PATCH] Synaptics TouchPad driver for 2.5.70

From: Vojtech Pavlik (
Date: Thu Jun 12 2003 - 17:57:09 EST

On Fri, Jun 13, 2003 at 12:01:35AM +0200, Peter Berg Larsen wrote:
> > > On Wed, Jun 11, 2003 at 10:48:14PM -0400, Joseph Fannin wrote:
> > > > > Here is a new patch that sends ABS_ events to user space. I haven't
> > > > > modified the XFree86 driver to handle this format yet, but I used
> > > > > /dev/input/event* to verify that the driver generates correct data.
> > > CaT <> writes:
> > > Aaaand... will I be able to transparently use my ps2 mouse and touchpad
> > > without having to worry about what's plugged in at any one time?
> The short answer is no, if you still have the gateway laptop.
> On 12 Jun 2003, Peter Osterlund wrote:
> > It works on my computer at least. When loading the psmouse module I
> > get this:
> > input: PS/2 Logitech Mouse on isa0060/serio2
> > input: Synaptics Synaptics TouchPad on isa0060/serio4
> It works for you because it (your laptop) has active multiplexing. Without
> active multiplexing I see no way of demultiplexing different mouse
> protocols in mousedev.
> A guestdevice behind the touchpad also needs demultiplexing even with
> activ multiplexing. This could be done in the synaptics driver but as the
> guestdevice can be any device, the synaptics driver needs to know every
> mouse protocol there is to demultiplex it. The synaptics driver sent does
> not demultiplex a guestdevice.

The synaptics driver, if it wished to demultiplex a true mouse protocol
behind the pad without an active multiplexing controller, could easily
create a new serio port, to which the psmouse driver would attach,
detect, and drive the mouse. It's a bit crazy, but it should work.

Vojtech Pavlik
SuSE Labs, SuSE CR
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