linux-kernel - Re: [PATCH] ASoC: dapm: Add support for multi register mux

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Message-ID: <1397074060904-837198.post@n7.nabble.com>
Date:	Wed, 9 Apr 2014 13:07:40 -0700 (PDT)
From:	Arun S L <aruns@...dia.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: dapm: Add support for multi register mux


On Fri, Apr 04, 2014 at 05:12:10PM -0700, Arun Shamanna Lakshmi wrote:
> 1. Modify soc_enum struct to handle pointers for reg and mask
> 2. Add dapm get and put APIs for multi register one hot encoded mux
> 3. Update snd_soc_dapm_update struct to support multiple reg update

> If you've got several changes like this it's probably a sign that the
> change ought to be split into a patch series.

> I'm still not seeing any handling of the issues with having invalid
> configurations written to the device during the process of carrying out
> multi register updates; I did raise this with one of the earlier
> versions but don't recall any response.

To handle the invalid configurations in case of a multi register update,
the 'not selected registers' are cleared first and only then 'selected
register'
is set. This is ensured by initializing the snd_soc_dapm_update structure
in the right order inside put_value_enum_onehot API.

> I also think I agree with Takashi on this one - trying to implement this
> without adding an abstraction for the control values is making the code
> more complex than it needs to be, all the conditional paths for _ONEHOT
> aren't pretty (and don't use switches which is the usual idiom for this
> stuff if it's not indirected via functions).

To summarize, I need to add get and put function pointers inside kcontrol
structure and use them during dapm_connect_mux and
dapm_set_mixer_path_status. Then, a separate soc_enum_onehot structure
can be used along with the above patch.

I can probably first submit a patch for adding abstraction to control values
and then submit the change for soc_enum_onehot.

Please correct me if my understanding is wrong. 



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