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From: Petr Kulhavy <petr@barix.com>
To: Lars-Peter Clausen <lars@metafoo.de>, alsa-devel@alsa-project.org
Subject: Re: GPIO control from ALSA
Date: Wed, 20 Apr 2016 10:51:23 +0200	[thread overview]
Message-ID: <5717430B.1030109@barix.com> (raw)
In-Reply-To: <57173EEB.5040403@metafoo.de>

On 20.04.2016 10:33, Lars-Peter Clausen wrote:
> 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

Thanks, Lars, for the good pointers! I will check that out.

Is there also a way to map GPIO to a control which then appears e.g. in 
alsamixer? That would be useful for the mic/line selection.

Regards
Petr

  reply	other threads:[~2016-04-20  8:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-20  8:03 GPIO control from ALSA Petr Kulhavy
2016-04-20  8:33 ` Lars-Peter Clausen
2016-04-20  8:51   ` Petr Kulhavy [this message]
2016-04-20  9:06     ` Lars-Peter Clausen
2016-04-20  9:47       ` Petr Kulhavy
2016-04-20 10:39         ` Lars-Peter Clausen

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