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

Janusz Krzysztofik jkrzyszt at tis.icnet.pl
Wed Jul 22 16:01:43 CEST 2009

Hi Mark,

Mark Brown wrote:
> On Wed, Jul 22, 2009 at 05:22:28AM +0200, Janusz Krzysztofik wrote:
>> This patch adds support for Conexant CX20442-11 voice modem codec, suitable
>> for use by the ASoC board driver for Amstrad E3 (Delta) videophone. Related
>> sound card driver will follow.
>> ...
> This patch is basically fine from an ASoC point of view so I've applied
> it.


> You'll want to run checkpatch over it and send a followup fixing the

Sorry for not doing this before submitting. Will send the followup soon.

> issues it identifies.  Looking at this I suspect that it may be possible
> to refactor things so that more of the line discipline interaction is
> pushed down into the CODEC driver but that can also be done as a
> followup.

I have put the line discipline code into the machine driver for two reasons:
1. For me, the actual code is much more machine than codec specific.
2. It was much easier to update the codec structure instance with 
machine's provided hw_write() rather than fiddle with adding a new 
member to the structure definition for passing a machine callback to the 
line discipline functions.

If you think we can find any use cases for drivers supporting 
codec/modem combination other than CX20442 on Amstrad Delta, I can agree 
with you on moving the line discipline code out of the machine driver, 
but instead of pushing it down to the codec I would rather se it as a 
separate module.  Anyway, I think that some kind of support on the ASoC 
top level for this case could be helpfull.

> would also be nice to add some documentation somewhere explaining how
> the hw_write() function is expected to be set up since it's a little
> surprising (if the line discipline stuff were pushed down into the code
> that'd become a lot more obvious).

I'll add a few words to the followup.


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