linux-kernel - Re: [PATCH 2/2] Input: tsc2007 - Add a z1_low

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Date:	Wed, 30 Nov 2011 10:34:18 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<feng.tang@...el.com>, "Clark, Joel" <joel.clark@...el.com>
Subject: Re: [PATCH 2/2] Input: tsc2007 - Add a z1_low_threshhold platform
 data parameter

On Tue, 29 Nov 2011 17:23:10 +0800
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> On Tue, Nov 29, 2011 at 04:12:58PM +0800, Feng Tang wrote:
> > This originates from a patch in Meego IVI kernel with the name
> > 	linux-2.6.37-connext-0027-tsc2007.patch
> > There is no author info excepte a line "From  MeeGo
> > <kernel@...go.com>"
> > 
> > When integrating tsc2007 on Intel IVI platform, there are a lot of
> > noise data whose z1 value is around 10 which is not a sane "z1". So
> > add a "z1_low_threshhold" to filter those nosie data, to make the
> > device work properly.
> 
> Sounds like a task for userspace to ignore pressure that is too low.
> Bonus points for making it configurable so user can adjust
> sensitivity.

Actually, there is one more point :), without this patch, the driver won't
work on our platforms.

The tsc2007_soft_irq will keep reading the input data unless there is no
valid pressure data. In our case, those noise data will be seen as valid
data during tsc2007_calculate_pressure(), and the tsc2007_soft_irq will
run endlessly.

Thanks,
Feng 

> 
> Thanks.
> 
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