linux-kernel - Re: SOLVED support of touchscreen reported as eGalax but is not working

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Date:	Mon, 02 Feb 2009 14:39:25 +0100
From:	Niels de Vos <niels.devos@...cor-nixdorf.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Max Weninger <max.weninger@...il.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	lifebook@...an.de
Subject: Re: SOLVED support of touchscreen reported as eGalax but is not working

Andrew Morton wrote:
> (cc restored - please jsut do reply-to-all, always)
> 
> On Tue, 27 Jan 2009 02:05:29 +0100
> Max Weninger <max.weninger@...il.com> wrote:
> 
>> Hi again
>>
>> On Tue, 27 Jan 2009 01:48:22 +0100
>> Max Weninger <max.weninger@...il.com> wrote:
>>
>>> On Tue, 27 Jan 2009 01:38:06 +0100
>>> Max Weninger <max.weninger@...il.com> wrote:
>>>
>>>> Hi
>>>>
>>>> On Mon, 26 Jan 2009 13:13:23 +0100
>>>> Niels de Vos <niels.devos@...cor-nixdorf.com> wrote:
>>>>
>>>>> Max Weninger wrote:
>>>>>> Niels de Vos <niels.devos@...cor-nixdorf.com> wrote:
>>>>>>> You can obviously download the drivers from
>>>>>>> <http://home.eeti.com.tw/web20/TouchKitDriver/linuxDriver.htm>.
>>>>>>>
>>>>>>> It would be great if eGalax could be convinced to get these
>>>>>>> drivers included in main-line ;)
>>>>>> Thanks for your quick reply
>>>>>> BUT: I have tried those driver also
>>>>>>
>>>>>> I tried this "brandnew" one (but also older ones)
>>>>>> http://home.eeti.com.tw/web20/drivers/touch_driver/Linux/2.06.2416/TouchKit-2.06.2410-32b-k26.tar.gz
>>>>>> after making it compile for 2.6.28.2 :)
>>>>>> since there is source code delivered
>>>>> For what it's worth; the version we use from eGalax is
>>>>> 1.0.3.1701. I don't have the hardware here atm, so I can't test
>>>>> an other driver now.
>>>> I tried kernel 2.6.23.17 and there the touchscreen is recognized
>>>> using the builtin usbtouchscreen driver
>>> It also works with 2.6.26.8
>> After comparing the usbtouchscreen.c sources between the different
>> versions I got it working by commenting the follwoing lines
>>
>> ...
>> #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
>>         /* ignore the HID capable devices, handled by usbhid */
>>         {USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},
>>         {USB_DEVICE_HID_CLASS(0x0eef, 0x0002), .driver_info = DEVTYPE_IGNORE},
>> ...
>>
>> Now the entry in /proc/bus/input/devices is created as in the
>> older versions.
>>
>> So it seems that usbhid is not correctly handling my type
>> of touchscreen if I understand the comment there correctly
>>
> 
> So... how do we fix this for real?

(...after some research...)

Best would probably be updating the Xorg evtouch-driver. It looks like someone 
already did this. I found a site containing a quite complete description of
(hopefully the same) problem: http://zalman.ostergaard.net/touch.html

However I don't think the changes were submitted upstream as the (new) driver 
does not contain support for the other eGalax-hardware anymore.

In my view the problem is not the Linux usbtouchscreen/usbhid driver, but the
evtouch-driver. It looks like the evtouch-driver is not maintained by the
Xorg-folks, but on http://www.conan.de/touchscreen/evtouch.html (contact
added in CC).

Anyone interested in creating a patch for evtouch?

Niels


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