linux-kernel - Re: [PATCH] input: elantech.c make sure touchpad is really in absolute mode

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Message-Id: <200903202246.31493.dmitry.torokhov@gmail.com>
Date:	Fri, 20 Mar 2009 22:46:31 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Arjan Opmeer <arjan@...eer.net>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: elantech.c make sure touchpad is really in absolute mode

Hi Arjan,

On Thursday 19 March 2009 22:52:39 Arjan Opmeer wrote:
> From: Arjan Opmeer <arjan@...eer.net>
>
> There exist laptops with Elantech touchpads where switching to absolute
> mode does not happen, although writing the configuration register succeeds
> without error. Reading back the register afterwards reveils that the
> absolute mode bit is not set as if masked out by the touchpad firmware.
>
> Always read back register 0x10, make sure that for hardware version 1 the
> absolute mode bit is actually set and fail otherwise. This prevents the
> case where the touchpad is claimed by the Elantech driver but is
> nonetheless not working.
>

Makes sense, will apply. Although, have you tried repeating the switch or
maybe issuing full reset before trying again?

-- 
Dmitry

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