linux-kernel - Re: [alsa-devel] [RFC] [PATCH 1/3] ASoC: Add support for Conexant CX20442-11 voice modem codec

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Message-Id: <200907281836.03049.jkrzyszt@tis.icnet.pl>
Date:	Tue, 28 Jul 2009 18:36:01 +0200
From:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	alsa-devel@...a-project.org, Jonathan McDowell <noodles@...th.li>,
	Tony Lindgren <tony@...mide.com>,
	Peter Ujfalusi <peter.ujfalusi@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	e3-hacking@...th.li, Arun KS <arunks@...tralsolutions.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [alsa-devel] [RFC] [PATCH 1/3] ASoC: Add support for Conexant CX20442-11 voice modem codec

Tuesday 28 July 2009 18:11:32 Mark Brown wrote:
> On Tue, Jul 28, 2009 at 06:07:29PM +0200, Janusz Krzysztofik wrote:
> > now. Activation of the line discipline would deregister the codec device
> > from the platform bus and reregister it again, now as the line discipline
> > provided device. Is this possible with current ASoC framework?
>
> No, not currently.  But why would you do that, anyway?
>
> Like I say, I'd suggest always keeping the controls registered and just
> masking and unmasking from user space - the control indexes get used so
> removing them will just confuse things.

However, in order for the machine driver to unmask/mask a machine specific 
control, the codec driver must drop the machine driver a message about the 
line discipline being activeted/deactivated, right? The only such existing 
feedback I can see the codec is able to use is via snd_soc_init_card() that 
calls snd_soc_dai_link.init() in turn. Am I missing something?

Janusz
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