[alsa-devel] Spdif: Control interface

[Pavel Hofman]

Dne 9.11.2011 09:13, Takashi Iwai napsal(a):
> At Wed, 09 Nov 2011 08:50:12 +0100,
> Pavel Hofman wrote:
>>
>> Dne 9.11.2011 06:28, ajay khandelwal napsal(a):
>>> Hi Pavel,
>>>  Thanks for reply
>>>
>>> Simple mixer control 'IEC958 Playback AC97-SPSA',0
>>>   Capabilities: volume volume-joined penum
>>>   Playback channels: Mono
>>>   Capture channels: Mono
>>>   Limits: 0 - 3
>>>   Mono: 3 [100%]
>>
>> Thanks. I assume you mean this control. For meaning of this control see
>> e.g. http://alsa.opensrc.org/Realtek_ALC650#SPDIF_support
>>
>> It is not related to volume, IMO capabilities of this control are
>> incorrect, there should be "enum" instead. Perhaps changing
>> SNDRV_CTL_ELEM_TYPE_INTEGER to SNDRV_CTL_ELEM_TYPE_ENUMERATED ?
> 
> Yes, from the design POV, it should have been an enum.
> But changing this would break many working user-space setups, so no-go
> for now.  Since AC97 is a legacy stuff, the worst thing is to break
> something.

Fair enough :)

Thanks,

Pavel.