linux-kernel - Re: eGalax TouchScreen

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Date:	Mon, 12 Oct 2009 12:17:13 +0200
From:	Daniel Ritz <daniel.ritz@....ch>
To:	Christian Loitsch <lkml@....delta64.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: eGalax TouchScreen

hi Christian

On 08.10.2009 22:19, Christian Loitsch wrote:
> Hello
> 
> (please CC me directly)
> 
> i don't need this touchscreen any longer, and would like to donate it to 
> anybody willing to work on improved support.
> 
> 10" (currently used with an MSI Wind)
> 0eef:0001 D-WAV Scientific Co., Ltd eGalax TouchScreen
> (you can find this touchscreen on ebay)
> 
> I once was able to make the touchscreen work, but it wasn't as easy as 
> pluging the touchscreen in.
> 
> First come first served, except for Daniel Ritz (the developer of the 
> touchscreen module), who has highest priority.

thanks a lot for this offer! but i will leave it to other interested
people since i have access to a eGalax screen (from xenarc).

> 
> Please just email me your address.  I will try to update: 
> <http://christian.delta64.com/touchscreen/stillAvailable.html>
> as fast as possible.
> 
> Please give me ~1week to prepare the package (and also give Daniel some 
> time to respond).
> 
> a+
> christian
> 
> here are some details i found out:
> 
> There are currently 3 ways an eGalax touchscreen 0eef:0001 can be 
> handled by the kernel.
> 
> 1) tkusb: a module (GPL) provided by the manufacturer, which is not in 
> the kernel and (AFAIK) requires a binary-only xorg module. [1]
> 
> 2) usbhid: which recognized my touchscreen, but I was not able to make 
> it work in xorg.
> 
> 3) the usbtouchscreen module.  This module only "accepts" the 
> touchscreen if usbhid did not (so I currently unload usbhid before 
> activating the touchscreen).
> This module however only works if the touchscreen is set to use a 
> different mode. (loading the tkusb module before the usbtouchscreen 
> module works, as tkusb sends this mode-change command to the touchscreen 
> [2])
> 
> The touchscreen works perfectly with usbtouchscreen and evdev.  I was 
> not able to make it work in any other way.
> 
> If I understood the usbtouchscreen code correctly you would just need to 
> add a device specific init for eGalax touchscreens and send the command 
> ([2]) to the device.  (AFAIK eeti does the same in their tkusb module 
> for every eGalax touchscreen).
> 
> [1]  <http://home.eeti.com.tw/web20/eGalaxTouchDriver/linuxDriver.htm>
> [2]  code from eeti-driver tkusb.c:
> ---
>                 #ifndef _REMOVE_CHANGE_FORMAT^M
>                         scr->output[0] = 0x0A;^M
>                         scr->output[1] = 1;^M
>                         scr->output[2] = 'A';^M
>                         if( !DoSendData( scr, 3 ) )^M
> ---
jup, that's the way to do it. i have some patches for usbtouchscreen
from various people in the mess that is my mailbox. i think one of
them adds exactly that init code. i'll try to get those in mergable
state soon...

thanks
-daniel



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