linux-kernel - Re: [PATCH] Fix genius pensketch 12x9 tablet

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Date:	Sat, 13 Dec 2008 01:51:13 -0800
From:	Matt Helsley <matt.helsley@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix genius pensketch 12x9 tablet

On Sat, 2008-12-13 at 00:55 -0800, Greg KH wrote: 
> On Sat, Dec 13, 2008 at 12:05:30AM -0800, Matt Helsley wrote:
> > On Fri, 2008-12-12 at 23:53 -0800, Greg KH wrote:
> > > On Fri, Dec 12, 2008 at 10:42:28PM -0800, Matt Helsley wrote:
> > > > The Genius PenSketch 12x9 tablet has a puck (labeled a
> > > > "Tablet Mouse") in addition to a pen. Without registering a quirk
> > > > the tablet appears to be a single input device that reports the
> > > > wrong axis information in /proc/bus/input/devices, and sends
> > > > incorrect events (e.g. ABS_Z instead of ABS_Y). This information
> > > > confuses the X evdev driver and makes the device impossible to
> > > > use.
> > > > 
> > > > The quirk fixes events and splits the device into multiple input
> > > > event devices so that at least the puck is useful.
> > > > 
> > > > Signed-off-by: Matt Helsley <matt.helsley@...il.com>
> > > > ---
> > > > NOTE: xinput lists the puck but not the pen. I've been using a
> > > > python script to verify the contents of the events independently
> > > > of X and, as far as I can tell, the remaining problems are in X
> > > > itself.
> > > 
> > > I have a tablet here that I'm having troubles getting to work.  Any
> > > chance I could get a copy of your python script so I can try to debug
> > > what is going wrong, and if it's a X problem or a kernel issue like you
> > > found for your device?
> > > 
> > > thanks,
> > > 
> > > greg k-h
> > 
> > Sure. Sometime around 2.6.24 I updated this script (originally by Micah
> > Dowty) to include more evdev #defines, work on 64-bit systems, and
> > decode some bitvectors into their C symbols.
> 
> Thanks, it has helped out, although it doesn't seem to "poll" the device
> properly for some reason to get any events from the device.  I wonder if
> X is grabbing it before this script has a chance to, I'll play around
> with that next...

I've seen that too. If X is running then it intercepts the events
somehow -- not sure if it's a grab or what. I can confirm this by
shutting down X and opening the device with the script from a VT.

Cheers,
	-Matt

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