linux-kernel - Re: wacom: Fixes for stylus pressure values for Thinkpad Yoga

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Message-ID: <CAF8JNh+7p7-cNkBv3CB3ZVsi7JrqzPf1bdzsA4rJqKUcY=dZ0Q@mail.gmail.com>
Date:	Wed, 26 Feb 2014 20:39:12 -0800
From:	Ping Cheng <pinglinux@...il.com>
To:	Carl Worth <cworth@...rth.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jason Gerecke <killertofu@...il.com>
Cc:	linux-input <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: wacom: Fixes for stylus pressure values for Thinkpad Yoga

Hi Carl,

Thank you for the heads up. I believe Jason's patchset 4 of 4
(http://www.spinics.net/lists/linux-input/msg29435.html) fixed the
issue for your device and for other's. The patch was submitted last
month. If you can test the set on your device and give us a Tested-by
here, it will help Dmitry to merge the patch upstream.

Thank you for your effort.

Ping

On Wed, Feb 26, 2014 at 2:38 PM, Carl Worth <cworth@...rth.org> wrote:
> This series of patches fixes the pressure values reported for the
> wacom tablet built-in to a Lenovo ThinkPad Yoga laptop. Prior to this
> patch series, if I slowly increased stylus pressure, (expecting a
> gradual increase of values from 0 to 1023), I instead received values
> that increased slowly to 255, then reset to 0 and increased slowly
> again, etc.
>
> The buggy arithmetic that is updated here appears to exist in
> identical forms for other drivers. I did not update any code that I
> was not able to test directly. But it looks like wacom_pl_irq and
> wacom_dtu_irq potentially have similar bugs, (depending on the actual
> pressure_max values encountered in practice).
>
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