[alsa-devel] [PATCH v2 1/2] ALSA: jack: create jack kcontrols for every jack input device

[David Henningsson]

On 2015-03-27 10:11, Jie, Yang wrote:
>> -----Original Message-----
>> From: David Henningsson [mailto:david.henningsson at canonical.com]
>> Sent: Friday, March 27, 2015 4:01 PM
>> To: Jie, Yang; Tanu Kaskinen; Takashi Iwai
>> Cc: perex at perex.cz; broonie at kernel.org; alsa-devel at alsa-project.org;
>> Girdwood, Liam R; Liam Girdwood
>> Subject: Re: [PATCH v2 1/2] ALSA: jack: create jack kcontrols for every jack
>> input device
>>
>>
>>
>> On 2015-03-27 08:45, Jie, Yang wrote:
>>>> -----Original Message-----
>>>> From: David Henningsson [mailto:david.henningsson at canonical.com]
>>>> Sent: Friday, March 27, 2015 2:50 PM
>>>> To: Jie, Yang; Tanu Kaskinen; Takashi Iwai
>>>> Cc: perex at perex.cz; broonie at kernel.org; alsa-devel at alsa-project.org;
>>>> Girdwood, Liam R; Liam Girdwood
>>>> Subject: Re: [PATCH v2 1/2] ALSA: jack: create jack kcontrols for
>>>> every jack input device
>>>>
>>>>
>>>>
>>>> On 2015-03-26 13:43, Jie, Yang wrote:
>>>>>
>>>>> Sorry, Correct a typo(removing line "create "Mic Jack" kctl;" in
>>>>> default case)
>>>>
>>>> It looks like your code can be simplified as:
>>> [Keyon] thanks, I will try simplify them.
>>>>
>>>> switch (type | SND_JACK_HEADSET) {
>>>> 	case SND_JACK_HEADSET:
>>>> 		create "Headset Mic Jack" kctl;
>>>> 		/* fall through */
>>>> 	case SND_JACK_MICROPHONE:
>>>> 	case SND_JACK_HEADPHONE:
>>>> 		create format("%s Jack", id) kctl;
>>> [Keyon] I don't want to fill "id" to kctl name, because sometimes it
>>> can be string which can't be understood by PA, such as:
>>>
>>> soc/intel/mfld_machine.c:       ret_val = snd_soc_card_jack_new(runtime-
>>> card,
>>> soc/intel/mfld_machine.c-                       "Intel(R) MID Audio Jack",
>> SND_JACK_HEADSET |
>>> soc/intel/mfld_machine.c-                       SND_JACK_BTN_0 |
>> SND_JACK_BTN_1, &mfld_jack,
>>>
>>> soc/omap/ams-delta.c:   ret = snd_soc_card_jack_new(card,
>> "hook_switch", SND_JACK_HEADSET,
>>> soc/omap/ams-delta.c-                               &ams_delta_hook_switch, NULL, 0);
>>
>> Ok, good point. It's a matter of different conventions between ASoC and
>> HDA. In ASoC, naming is wild west. In HDA, naming is (mostly) consistent and
>> we depend on the exact naming for userspace to know exactly how the jack
>> functions.
>>
>> Another example is HDMI/DisplayPort, where the hw often supports several
>> ports and we need to know which jack belongs to which PCM device, and we
>> use the name of the jack to determine that.
>>
>> I would very much prefer that all the ASoC jack names (and mixer control
>> names!) would be fixed up to be consistent to the extent that makes sense,
>> but the ASoC people haven't really agreed to do that, but instead prefer to
>> use a large database of UCM files. :-( And seen from a UCM context, that the
>> ASoC jacks are labelled terribly inconsistent, isn't that big of a deal given that
>> UCM will specify the jack name anyhow.
> [Keyon] that's the bad status. :(
> Maybe we can just make HDA jack kctls works and leave not standard name
> soc jack kctls invisible for PA?

If with "invisible for PA" you mean that there are still kctls created, 
but their naming of the jacks are non-standard, yes, I think this is an 
okay outcome of your patch.
I still think ASoC should change their jack naming to be more 
consistent, but that can be addressed in some future patch set.


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