Re: [RFC/RFT] [patch] Elo serial touchscreen driver

[Vojtech Pavlik <vojtech@suse.cz>]

On Wed, Feb 09, 2005 at 09:03:51PM +0100, Jan-Benedict Glaw wrote:

> > > It's even worse. Most keyboards don't separate the real keys from 
> > > magnetic stripe reader events, and just simulate key presses for MSR 
> > > data. They expect the software to be in a state where it is waiting for 
> > > that data, and will process it accordingly.
> > 
> > In that case I'm not sure if the kernel should care at all what the data
> > is.
> 
> The problematic part is that this needs to be done at a quite low level,
> since POS keyboards may send quite a lot more than make/break codes in
> "proper" order...

I'll need some specific examples of protocols the keyboard use to judge
how to tackle that.

> > > What we've done in our application is to use the timings and sequence of 
> > > key presses to distinguish between normal key presses and MSR data :P
> > 
> > Yes, embedded and single purpose systems are often full of hacks like
> > this.
> 
> ...and especially this problem can be better solved by reprogramming the
> MCR readers :-)


-- 
Vojtech Pavlik
SuSE Labs, SuSE CR