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From: Dmitry Torokhov <dtor_core@ameritech.net>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: request for opinion on synaptics, adb and powerpc
Date: Fri, 6 Jan 2006 23:46:30 -0500
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Cc: Peter Osterlund <petero2@telia.com>, Luca Bigliardi <shammash@artha.org>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       Vojtech Pavlik <vojtech@suse.cz>, linux-kernel@vger.kernel.org
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On Friday 06 January 2006 23:44, Benjamin Herrenschmidt wrote:
> On Fri, 2006-01-06 at 23:36 -0500, Dmitry Torokhov wrote:
> > On Friday 06 January 2006 23:33, Benjamin Herrenschmidt wrote:
> > > 
> > > > Why would you want to switch to relative mode when leaving X? As far as
> > > > I know the only other mouse "user" out there is GPM and there are patches
> > > > available for it to use event device:
> > > > 
> > > > 	http://geocities.com/dt_or/gpm/gpm.html
> > > > 
> > > > Unfortunately the maintainer can't find time to merge these so they were
> > > > sitting there for over 2 years. FWIW Fedora patches their GPM with these.
> > > 
> > > gpm among other legacy things ...
> > > 
> > 
> > What other legacy things? And in that case I think manually forcing protocol
> > back to relative would be an option.
> > 
> > The thing is that Synaptics in absolute and relative mode is 2 completely
> > different devices with different capabilities. If you want to switch mode
> > you really need to kill old input device and create a brand new one.
> 
> Ok, so what method should we use to "switch" ? sysfs isn't quite an
> option yet as the ADB bus isn't yet represented there (unless we add
> attributes to the input object, but that's a bit awkward as it would be
> destroyed and re-created if I follow you). A module option would work
> but adbhid isn't a module, thus that would basically end up as a static
> kernel argument, unless the driver "polls" the module param regulary to
> trigger the change.. I don't think there is a way for a driver to get a
> callback when /sys/module/<driver>/parameters/* changes is there ?
> 

Yes, there is, but I'd imagine static option would be just fine. After
all you either use legacy applications or you don't. And if mousedev
does not provide adequate emulation you switch to relative mothod.


-- 
Dmitry
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