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In-Reply-To: <1393454296-32735-1-git-send-email-cworth@cworth.org>
References: <1393454296-32735-1-git-send-email-cworth@cworth.org>
Date: Wed, 26 Feb 2014 20:39:12 -0800
Message-ID: <CAF8JNh+7p7-cNkBv3CB3ZVsi7JrqzPf1bdzsA4rJqKUcY=dZ0Q@mail.gmail.com>
Subject: Re: wacom: Fixes for stylus pressure values for Thinkpad Yoga
From: Ping Cheng <pinglinux@gmail.com>
To: Carl Worth <cworth@cworth.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Jason Gerecke <killertofu@gmail.com>
Cc: linux-input <linux-input@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org

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@cworth.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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