linux-kernel - Re: [PATCH 01/14] mfd: arizona: Add jack pointer to struct arizona

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Date:   Mon, 28 Dec 2020 16:28:07 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 01/14] mfd: arizona: Add jack pointer to struct arizona

On Mon, Dec 28, 2020 at 02:16:04PM +0100, Hans de Goede wrote:

> And more in general AFAIK extcon is sort of deprecated and it is
> not advised to use it for new code. I would esp. not expect it to
> be used for new jack-detection code since we already have standard
> uAPI support for that through sound/core/jack.c .

Has Android been fixed to use the ALSA/input layer interfaces?  That's
why that code is there, long term the goal was to have ALSA generate
extcon events too so userspace could fall over to using that.  The basic
thing at the time was that nobody liked any of the existing interfaces
(the input layer thing is a total bodge stemming from it having been
easy to hack in a key for GPIO detection and using ALSA controls means
having to link against alsa-lib which is an awful faff for system level
UI stuff) and there were three separate userspace interfaces used by
different software stacks which needed to be joined together, extcon was
felt to be a bit more designed and is a superset so that was the
direction we were heading in.

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