RE: Touchscreen hardware hacking/driver hacking.

[Greg.Chandler]

In my many rounds of research on this, I'm pretty sure that this is the
same setup as the lifebook.
Wether the implementation is the same, is a matter of conjecture as long
as I can't see the device.

Both of you suggested checking the PS/2 under windows, unfortunatly I
know of no "sniffer" type drivers or apps
to listen directly on a logical PS/2 interface.  If you know where I can
find something like that that would be of more help than anything at
this point.



-----Original Message-----
From: dmitry.torokhov@xxxxxxxxx [mailto:dmitry.torokhov@xxxxxxxxx] On
Behalf Of Dmitry Torokhov
Sent: Tuesday, October 17, 2006 4:12 PM
To: Chandler, Greg
Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-input@xxxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: Touchscreen hardware hacking/driver hacking.

On 10/17/06, Greg.Chandler@xxxxxxxxxxxxxx <Greg.Chandler@xxxxxxxxxxxxxx>
wrote:
>
> I'm working on a prototype Hitachi tablet, it uses a Fujitsu 4-wire 
> resistive touchscreen. {10.4" I think} I've found that windows-xp 
> embedded uses a generic ps/2 driver for the device.
>
> I've ripped this thing to pieces on several occasions looking for 
> chips to help the porting, my problem is that I can not find the 
> analog-digital converter for this thing.  The connector goes to a 
> surface mount header on an 8 layer board.
> I loose the traces almost instantly.  Given that I can't find the 
> converter anywhere what should I do next?
>
> I've done my homework and found that this HAS to be either serial or 
> usb attached according to Fujitsu.
> Aparently it's neither.  There are no unknown USB devices {or known 
> matching}, and there is no activity on the single serial port on the 
> system.  Since the windows driver uses PS/2 as the interface I have a 
> horrible feeling this thing has an interpretation layer that makes it 
> a
> PS/2 mouse, and that may or may not royally be a nightmare.
>

The touchscreen might need a "magic knock" to activate. You might try to
see what data wondows driver sends to PS/2 port.

Also check of Lifebook touchscreen protocol will work for you. You will
need to adjust DMI table in drivers/input/mouse/lifebook.c/

> I would have posted this to a different group but there is no "input"
> mailing list.
>

linux-input@xxxxxxxxxxxxxxxxxxxxxxxx

But you must be subscribed to post otherwise list just drops your mails
on the floor.

--
Dmitry


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