linux-kernel - Re: Nokia N900 sound driver and ECI GPIOs

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Message-ID: <20170102093345.GA20104@amd>
Date:   Mon, 2 Jan 2017 10:33:45 +0100
From:   Pavel Machek <pavel@....cz>
To:     Jarkko Nikula <jarkko.nikula@...mer.com>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Eduardo Valentin <edubezval@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Nishanth Menon <nm@...com>, Sebastian Reichel <sre@...nel.org>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        joerg Reisenweber <joerg@...nmoko.org>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Nokia N900 sound driver and ECI GPIOs

Hi!

> > I'd like to get detection of headset button presses to work in recent
> > kernels, but could not figure it out :-(.
> > 
> My vague memory doesn't tell how basic button press detection was
> implemented in Maemo kernel. Was it codec, same voltage detection
> circuit than ECI or some another GPIO? I don't even remember did we
> implement it for the MeeGo N900 developer edition :-(

Another GPIO, as far as I can tell. There was some delay logic in 2.6
kernel (it removed false events happening when jack was inserted),
other that that it should be quite simple. (But I did not yet figure
it out in 4.x kernel).

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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