Re: Driver problems: t213 on i8042 port

[Alex Hudson <home@alexhudson.com>]

Hi Dmitry,

Thanks for responding, much appreciated ;)

On Fri, 2010-12-10 at 23:15 -0800, Dmitry Torokhov wrote:
> > I'm having some trouble with the serio support for a touchit213 device,
> > and I'm hoping by describing what's going on someone can offer some
> > clues.
> 
> I guess I'd start by making sure that you are indeed dealing with
> touchit123 and not some other device.

Indeed, I'm pretty sure this is the right device. The xf86 driver I
mentioned comes as a source module, and accesses the device via
serio_raw. I've compared the code and the protocol is identical: and
indeed, the xf86 module makes clear some things the serio driver implies
(e.g., the xf86 driver treats the data definitively as 11-bit).

The problem with the xf86 driver is many-fold; it was written pre-Xorg
and it's taken me a fair bit of hacking just to even get it to work on
Fedora 14 without segfaulting. It's also a lot more complex than the
serio equivalent.

> > Now, there is a serio driver for the touchit213 series, but the obvious:
> > 
> > 	echo -n "touchit213" > /sys/bus/serio/devices/serio4/drvctl
> > 
> > .. doesn't work. I don't see anything in the logs; whereas if I use
> > inputattach to connect the driver to ttyS0 (which doesn't have the
> > device, obviously) I can see that the driver is enabled
> > in /var/log/messages and a touch /dev/input/event device is created.
> 
> Right, the current touchit123 driver only binds to serio that has
> appropriate type. Basically this means that the driver only works with
> serial ports (ttySx) and not PS/2 ports.

I think you've nailed the problem, then - is this to do with the
structure in touchit213_serio_ids[]? I had only really been looking at
the connect() function.

Is it possible it's as simple as adding another stanza accepting
SERIO_8042 or is there a more fundamental reason why ttySx is only
allowed?

Thanks for all your help, 

Alex.


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