linux-kernel - Re: [PATCH v3 06/10] ASoC: tegra: Add a control for the headphone switch

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Message-ID: <CAEUnVG6tKmdTt455w8g9C2_+XXpKz5=TR7=V8Lo3uJ3DKrOvag@mail.gmail.com>
Date:	Wed, 28 Jan 2015 09:46:27 -0800
From:	Dylan Reid <dgreid@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Andrew Bresticker <abrestic@...omium.org>,
	Simon Glass <sjg@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Wolfram Sang <wsa@...-dreams.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 06/10] ASoC: tegra: Add a control for the headphone switch

On Wed, Jan 28, 2015 at 3:02 AM, Mark Brown <broonie@...nel.org> wrote:
> On Wed, Jan 28, 2015 at 11:51:04AM +0100, Tomeu Vizoso wrote:
>
>> To be used by userspace when the headphones jack is plugged in.
>
>>  static const struct snd_kcontrol_new tegra_max98090_controls[] = {
>> +     SOC_DAPM_PIN_SWITCH("Headphones"),
>>       SOC_DAPM_PIN_SWITCH("Speakers"),
>>  };
>
> Why is userspace doing this?  If this is supposed to be associated with
> the jack detection I'd expect us to be doing this in kernel.

This is only related to jack detection in that seeing a jack insert or
removal can cause userspace to set or unset it depending on the
current policy.
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