[PATCH] ALSA: core: sysfs: show components string

[Pierre-Louis Bossart]

>>>> when people report that their microphone is not reported by PulseAudio/UCM,
>>>> it's very helpful to know what UCM was supposed to use in the first place.
>>>> We don't have a debugger or step-by-step mechanisms to figure out what the
>>>> configurations are.
>>>
>>> If I get your intension correctly, the addition of sysfs node is just to
>>> investigate which use-case configuration is applied in cases that people
>>> get issues. If so, it's really exaggerative in a point of the concept of
>>> sysfs.
>>>
>>> I have two alternatives. If it's possible to focus on ALSA SoC part only,
>>> addition of node to debugfs is reasonable for this purpose.
>>>
>>> Another alternative is to change output of 'cards' node of procfs. The
>>> latter is commonly available for all cases. For example:
>>
>> I initially wanted to use /proc but thought it was a thing from the
>> past so I looked at sysfs. If this is the recommendation I don't mind
>> using it.
> 
> procfs will practically never die, and it's already there, so I'm fine
> with that path, too, supposing that the primary purpose is for help
> debugging / analyzing.  If it's used by UCM or whatever configuration
> tool, sysfs is the better choice, OTOH.
> 
>> debugsfs is not something the average user is familiar with, and it's
>> not available in all cases. I'd like to extend existing pieces of
>> information than add new things.
> 
> Right, debugfs isn't available per card as default, so it's no good
> option.

ok, let's go with procfs then, thanks for the feedback. I'll work on an 
update and resubmit.
-Pierre