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

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Date:	Wed, 4 Feb 2009 22:59:42 +0100
From:	Max Weninger <max.weninger@...il.com>
To:	Daniel Ritz <daniel.ritz-ml@...ssonline.ch>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Niels de Vos <niels.devos@...cor-nixdorf.com>,
	linux-usb@...r.kernel.org
Subject: Re: SOLVED support of touchscreen reported as eGalax but is not
 working

Hi

On Wed, 4 Feb 2009 00:44:11 +0100
Daniel Ritz <daniel.ritz-ml@...ssonline.ch> wrote:

> On Tuesday 03 February 2009 07:59:29 Andrew Morton wrote:
> > On Sat, 31 Jan 2009 23:09:01 +0100 Max Weninger
> > <max.weninger@...il.com> wrote:
> [snip]
> > > > > 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?
> > > 
> > > Well I am really not an expert in kernel programming :-)
> > > I found out that these lines where added based on this thread
> > > from 2008
> > > 
> > > http://kerneltrap.org/mailarchive/linux-kernel/2008/6/28/2286264/thread
> > > 
> > > So all I can do is to provide any help in testing if needed
> > > 
> > 
> > (optimistically cc'ing Daniel).
> 
> looks like it worked :)
> 
> ermm, that ignoring code...seems like i was just a little bit stupid
> when i wrote it...
> 
> Max, please try the attached patch...

I patched usbtouchscreen.c in my 2.6.28.2 kernel

But if I look in /proc/bus/usb/devices
the touchscreen is now managed from the usbhid driver
so usbtouchscreen is again ignoring my device

/proc/bus/input/devices is again empty and no
entry exists for the touchscreen :-(

This is the same behaviour that I had before
copying back "my patched" version and everything is
working again.

Just to make sure I understand how this should work
the entry must be there also if usbhid is managing
the touchscreen right?

BTW: dmesg contains a new line with the patched version
generic-usb: probe of 0003:0EEF:0001.0002 failed with error -32
when initializing the touchscreen

So sorry no success here

But I have to say that I got this touchscreen very cheap
second hand and maybe this is just some stupid problem
only for this device.

If your code works for all the other devices you tested
I am fine doing my change for now and you should not
waste more time on this :-)

Thanks

Max

> rgds
> -daniel
> 
> --------
> 
> [PATCH] usbtouchscreen: fix eGalax/ETTI HID device ignoring
> 
> Fix the eGalax/ETTI HID device ignoring by adding a match for the
> protocol too. This is what the marco USB_DEVICE_HID_CLASS() was
> supposed to do anyways.
> 
> Devices confirmed to be real HID have the class set to HID and the
> protocol set to 'mouse'.  Some have HID class but protocol set to
> 'none'. Those are not HID and should be driven by usbtouchscreen.
> 
> Signed-off-by: Daniel Ritz <daniel.ritz@....ch>
> 
> diff --git a/drivers/input/touchscreen/usbtouchscreen.c
> b/drivers/input/touchscreen/usbtouchscreen.c index 5080b26..ba6237a
> 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c
> +++ b/drivers/input/touchscreen/usbtouchscreen.c
> @@ -118,7 +118,8 @@ enum {
>  
>  #define USB_DEVICE_HID_CLASS(vend, prod) \
>  	.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS \
> -		| USB_DEVICE_ID_MATCH_DEVICE, \
> +		| USB_DEVICE_ID_MATCH_DEVICE \
> +		| USB_DEVICE_ID_MATCH_DEV_PROTOCOL, \
>  	.idVendor = (vend), \
>  	.idProduct = (prod), \
>  	.bInterfaceClass = USB_INTERFACE_CLASS_HID, \
> 
> 

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