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Date: Mon, 2 Jan 2017 10:33:45 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Jarkko Nikula <jarkko.nikula@bitmer.com>
Cc: Pali =?iso-8859-1?Q?Roh=E1r?= <pali.rohar@gmail.com>,
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        joerg Reisenweber <joerg@openmoko.org>, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: Nokia N900 sound driver and ECI GPIOs
Message-ID: <20170102093345.GA20104@amd>
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Hi!

> > I'd like to get detection of headset button presses to work in recent
> > kernels, but could not figure it out :-(.
> >=20
> 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
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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