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From: Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
To: Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
Cc: uclinux-dist-devel-ZG0+EudsQA8dtHy/vicBwGD2FQJk+8+b@public.gmane.org,
	alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org,
	Liam Girdwood <lrg-l0cyMroinI0@public.gmane.org>
Subject: Re: [PATCH 2/8] ASoC: Add support for virtual switch controls
Date: Fri, 11 Jan 2013 12:19:12 +0000	[thread overview]
Message-ID: <20130111121912.GY20956@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <1357833977-3682-2-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>


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On Thu, Jan 10, 2013 at 05:06:11PM +0100, Lars-Peter Clausen wrote:

> More specific this will be used by the ADAU1361 driver where the hardware has
> a mute control for each of the DAC output paths, but we have to make sure that
> the path is muted whenever the DAC is disabled. So the mute switches needs
> to be controlled by DAPM so it can disable them before disabling the DAC. On the
> other hand we still want to be to mute individual paths. This will be
> accomplished by using virtual switch controls.

This doesn't sound like it does quite what you want - it means you don't
actually end up with a mute control, only a power control (which is also
going to affect everything else in the path).  I'd expect to see
something like this implemented by having a control that has a specified
value forced in the register while the control is enabled (kind of the
opposite of a supply).  This is a fairly common need for older parts
though it's unusual to see it on a new device.

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  parent reply	other threads:[~2013-01-11 12:19 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-10 16:06 [PATCH 1/8] regmap: Add support for 24 bit wide register addresses Lars-Peter Clausen
2013-01-10 16:06 ` [PATCH 2/8] ASoC: Add support for virtual switch controls Lars-Peter Clausen
     [not found]   ` <1357833977-3682-2-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-01-11 12:19     ` Mark Brown [this message]
2013-01-11 12:38       ` Lars-Peter Clausen
2013-01-11 12:45         ` Mark Brown
     [not found]           ` <20130111124535.GZ20956-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2013-01-11 12:56             ` Lars-Peter Clausen
2013-01-11 13:57               ` Mark Brown
2013-01-11 15:05                 ` Lars-Peter Clausen
     [not found]                   ` <50F02A51.3010108-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-01-11 15:08                     ` [alsa-devel] " Lars-Peter Clausen
2013-01-11 15:22                     ` Mark Brown
2013-01-11 16:24     ` Mark Brown
     [not found] ` <1357833977-3682-1-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-01-10 16:06   ` [PATCH 3/8] ASoC: Add ADAU1X61 and ADAU1X81 CODECs common code Lars-Peter Clausen
2013-01-10 16:06   ` [PATCH 4/8] ASoC: Add ADAU1361/ADAU1761 CODEC support Lars-Peter Clausen
2013-01-10 16:06   ` [PATCH 5/8] ASoC: Add ADAU1381/ADAU1781 " Lars-Peter Clausen
2013-01-10 16:06   ` [PATCH 6/8] ASoC: Constify ops and compr_ops fields of snd_soc_dai_link Lars-Peter Clausen
2013-01-13 22:55     ` Mark Brown
2013-01-10 16:06   ` [PATCH 7/8] ASoC: Blackfin: ADAU1X61 eval board support Lars-Peter Clausen
2013-01-10 16:06   ` [PATCH 8/8] ASoC: Blackfin: ADAU1X81 " Lars-Peter Clausen

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