[alsa-devel] ASoC, DMI and UCM

[Jaroslav Kysela]

Dne 20. 11. 19 v 19:19 Mark Brown napsal(a):
> On Wed, Nov 20, 2019 at 11:04:38AM +0100, Jaroslav Kysela wrote:
> 
>> 	I would like to discuss the way we use DMI information for the board
>> identification in ASoC for the user space (long card name). It's a bit
>> redundant information, because DMI is already exposed through
>> /sys/class/dmi/id/ to the user space nowadays.
> 
>> 	My idea is to add 'DMI:sysfs' ctl info component string for the appropriate
>> ASoC driver to detect the existence of this dmi interface. Then I can add
>> the sysfs support to the ucm2 conditions.
> 
> I'm not clear what adding the component string does here - is the
> intention just to say that the card is built in to the machine and hence
> DMI can be used?  If that is the case something more generic that'd also
> work with other firmware interfaces might be good.

Yes, basically, it would mean that the sound card is integrated to the 
motherboard thus the DMI info can be used for the special configs. I already 
added sysfs support to alsa-lib ucm substitution.

Thinking more -  we don't need this probably urgently for ASoC drivers, 
because they all work with the integrated (built in) hardware, but it might 
make sense for other drivers. Probably another component identifier should be 
selected like 'integrated' or 'builtin' or so.

					Jaroslav

-- 
Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.