linux-kernel - Re: v4.1 to v4.7: regression in tsc2005 driver

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Date:	Thu, 21 Jul 2016 16:42:41 +1000
From:	Peter Hutterer <peter.hutterer@...-t.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Michael Welling <mwelling@...e.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org, pali.rohar@...il.com, sre@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com, serge@...lyn.com
Subject: Re: v4.1 to v4.7: regression in tsc2005 driver

On Thu, Jul 21, 2016 at 08:32:34AM +0200, Pavel Machek wrote:
> Hi!
> 
> > > In the mean time you can adjust the name or use XID instead.
> > 
> > X has partially fixed this a few years ago. All input drivers (that
> > matter) export a Device Node property that sets the device node for each
> > device.
> > 
> >  $ xinput list-props "SynPS/2 Synaptics TouchPad" | grep "Device Node"
> >         Device Node (261):      "/dev/input/event4"
> > 
> > Based on that you can get the udev device and work your way into any of the
> > sysfs tree. Or do whatever else you want.
> > 
> > But other than that there isn't anything in X to fix. xinput is primarily a
> > debugging tool and it does name resolution for convenience. But it's not a
> > tool for complex configurations. It does exactly what it needs to do, if you
> > need something that's more complicated and relies on information not
> > available to the X device itself then you'll need to write a custom tool
> > that does what you need. sorry.
> 
> Ok.. so out of the box, touchscreen is "upside down" and miscalibrated
> on n900. So I need to run
> 
> xinput --set-prop --type=float 8 115  1.10 0.00 -0.05  0.00 1.18 -0.10 0.00 0.00 1.00
> xinput --set-prop --type=int 8 249 0 1
> 
> (or equivalent with names) so that I can use the touchscreen. (And
> that's quite important -- X is somehow unusable without pointing
> device).
> 
> If xinput is not the right solution, what is the right solution?

if it's reliably miscalibrated (i.e. the numbers don't change), use an
xorg.conf snippet. If it needs some run-time changes add the hooks to
whatever does the calibration. the X api itself is trivial, you can lift it
from xinput.

fwiw, you don't need to specify the type, in fact it's better not to
because then libinput will just pick the right type anyway (or complain in
case of mismatch).

Cheers,
   Peter