On 05/08/2013 02:14 PM, Takashi Iwai wrote:
> At Wed, 08 May 2013 14:09:31 +0200,
> Clemens Ladisch wrote:
>>
>> David Henningsson wrote:
>>> I recently came across a strange ASoC volume control. In this case,
>>> the values are not in volume order, i e, the control is declared
>>> something like below.
>>>
>>> However alsamixer seems not to handle this "reordering" correctly. My
>>> question is if this is something that should be fixed in alsamixer (or
>>> possibly alsa-lib?), or does one need to write some kind of mapping
>>> table in the kernel, just to make something come in volume order to
>>> userspace?
>>
>> Items in a DB_RANGE container must be ordered by their values *and* by
>> their dB values.  This implies that larger values must correspond with
>> larger dB values, whis is also required for all other mixer controls.
>>
>> If the register values are unordered, the driver must reorder them.
>
> Yep.  Although there is no explicit definition, it's an implicit rule,
> as we have never implemented the parser code to allow the disorder.
>
> We should add a text mentioning that somewhere.  A patch is welcome ;)

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-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic