From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: GPIO control from ALSA
Date: Wed, 20 Apr 2016 10:33:47 +0200
Message-ID: <57173EEB.5040403@metafoo.de>
References: <571737E4.5030908@barix.com>
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To: Petr Kulhavy <petr@barix.com>, alsa-devel@alsa-project.org
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On 04/20/2016 10:03 AM, Petr Kulhavy wrote:
> Hello,
> 
> I'm writing a driver for ASoC "sound card" hardware which uses CPU GPIO to
> mute/unmute an analogue amplifier and another GPIO to control an analogue
> switch for line/mic switching. Is there an abstraction in ALSA to model this
> kind of hardware?

There is no abstraction. Use controls and/or DAPM and the standard GPIO API,
if you grep the sources you'll find a few examples of drivers using GPIOs to
mute amplifiers and similar (e.g. qi_lb60).

- Lars