linux-kernel - Re: [PATCH 3/3] ASoC: fsl: imx-wm8962: Add headphone and microphone jack plugin/out detection

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Date:	Fri, 6 Dec 2013 22:52:40 +0800
From:	Nicolin Chen <b42378@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <alsa-devel@...a-project.org>,
	<tiwai@...e.de>, <perex@...ex.cz>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<rob@...dley.net>, <ijc+devicetree@...lion.org.uk>,
	<swarren@...dotorg.org>, <mark.rutland@....com>,
	<pawel.moll@....com>, <rob.herring@...xeda.com>
Subject: Re: [PATCH 3/3] ASoC: fsl: imx-wm8962: Add headphone and microphone
 jack plugin/out detection

On Fri, Dec 06, 2013 at 03:03:19PM +0000, Mark Brown wrote:
> On Fri, Dec 06, 2013 at 10:38:17PM +0800, Nicolin Chen wrote:
> > On Fri, Dec 06, 2013 at 02:42:56PM +0000, Mark Brown wrote:
> 
> > > What's this uevent trying to do and why is it open coded in the driver?
> 
> > That's a requirement from Android team of Freescale. By checking this
> > event they can determine whether current output is speaker or headphone
> > so as to place an icon on the notification area.
> 
> > Sir, if you think this patch is not common enough or non-community style,
> > I can try to cut it down to an common one or entirely drop it.
> 
> This isn't mainline stuff, this is the Android standard switch class.
> Someone should really contribute something to Android which backs it
> onto the back of ALSA jacks.  The mainline equivalent is extcon which
> does have switch class emulation but it's a bit broken in its generation
> of uevents and is also not yet integrated into the ALSA jack stuff.
> 
> The thing to do is ideally integrate extcon with the ALSA jack code and
> update the Android headset observer to work with extcon (or write a
> separate extcon based observer).

Thank you for the detailed explain. It looks more complicated to me with
current code base. I think I should just extract the mainline-style part
so it'll make things easy if there's gonna be some plausible integrations
afterward.

Thank you indeed,
Nicolin Chen


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