linux-kernel - Re: [alsa-devel] [PATCH 1/4] ASoC: rockchip: add rockchip machine driver

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Date:	Tue, 19 May 2015 09:37:58 -0700
From:	Dylan Reid <dgreid@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Heiko Stübner <heiko@...ech.de>,
	zhengxing <zhengxing@...k-chips.com>,
	Takashi Iwai <tiwai@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Douglas Anderson <dianders@...omium.org>,
	Xing Zheng <acgzxing@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-rockchip@...ts.infradead.org,
	Sonny Rao <sonnyrao@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH 1/4] ASoC: rockchip: add rockchip machine driver

On Tue, May 19, 2015 at 4:16 AM, Mark Brown <broonie@...nel.org> wrote:
> On Fri, May 15, 2015 at 10:40:59PM +0200, Lars-Peter Clausen wrote:
>
>> I think the proper way to support this is come up with the concept of jack
>> detection providers and consumers. A component can register a jack detection
>> provider just like it can register a DAI. And then in the board driver you'd
>> just link the jack detection logic to the jack using the usual approach,
>> which is also used for DAIs (e.g. of node or device name). The core would
>> then take care of calling a enable callback or whatever is required to setup
>> the jack detection logic in the driver.
>
> Yes, nobody has really cared about it since we started pushing things
> out of the card init into the device level.  We would also need to add a
> way to force microphone biases on for devices where that's not a part of
> the jack detection IP.
>

Can the jacks can each be an aux_dev?  The jack driver would create
the jack at probe time and register it with the card in aux_dev->init.
cht_bsw_max98090_ti.c is already doing something similar, although all
contained in the machine driver.

If the jack detection circuit is integrated with a full codec, then
the codec driver can also create the jack and register it with the
card.

Then simple-card can have an optional property to specify aux devs.  A
GPIO jack device could handle simple switch-based jack detection.
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