linux-kernel - Re: [PATCH] HID: add multi-input quirk for eGalax Touchcontroller

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Message-ID: <20100203033914.GA23850@barra.bne.redhat.com>
Date:	Wed, 3 Feb 2010 13:39:14 +1000
From:	Peter Hutterer <peter.hutterer@...-t.net>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: add multi-input quirk for eGalax Touchcontroller

On Tue, Feb 02, 2010 at 10:44:35PM +0100, Jiri Kosina wrote:
> On Tue, 2 Feb 2010, Peter Hutterer wrote:
> 
> > Nonetheless, I'm not sure about whether that's the right thing to do. With
> > this patch applied, it gives me two devices, one mute, the other one
> > announces BTN_PEN and BTN_TOUCH + abs axes, though only BTN_TOUCH is ever
> > triggered. Loading usbtouchscreen instead of usbhid for this device makes
> > the device look more sane BTN_TOUCH + abs axes but the actual data is
> > random. So I'm not quite sure what the fix is supposed to be, any hints are
> > appreciated if it's not the patch below.
> 
> The data could also be mis-interpreted because of some bug in the HID 
> descriptor.
> 
> Does looking at the HID report descriptor and looking at the actual 
> raw HID reports coming out from the device give any clue? (in recent 
> kernels, you can just use 'hid' directory in debugfs to gather all this 
> information).

Thanks. The hid descriptor table is attached, but tbh I'm not well-versed
enough in the HID protocol to even tell what format I can give you. I've
attached a simple hexdump of two presses, one with a finger, one with the
stylus. Let me know what format you need or what how I can start to decypher
this myself (are there any parsing tools around?).
 
Cheers,
  Peter

View attachment "events.hexdump" of type "text/plain" (4096 bytes)

View attachment "eGalax-hid-descriptor" of type "text/plain" (2113 bytes)