[alsa-devel] [RFC] hda - is_jack_detectable()

[Raymond Yau]

2011/11/17, Takashi Iwai <tiwai at suse.de>:
> At Wed, 16 Nov 2011 15:14:17 +0800,
> Raymond Yau wrote:
>>
>> 2011/11/14 Takashi Iwai <tiwai at suse.de>:
>
>> >
>> > The lack of the initial pin-state of kclts was fixed in a different
>> > patch now.  But, the need of 200ms delay worries me whether it's
>> > needed generically at each pin-sense reading or it's just only for the
>> > initial reading.
>> >
>> > Does the pin-sense reading work in general after loading the driver
>> > stably?
>> >
>> >
>> >
>>
>> Presence detect bit is alway correct, without the delay.
>>
>> the only issue is the impedance measurement of the plugged jacks at
>> computer boot need a delay 200ms
>>
>> For the user application to know the impedance ,
>> it seem the client application have to issue
>> 1) set_pin_sense
>> 2) delay
>> 3) get_pin_sense to get the correct impedance of the attached device
>>
>> just like my modified hda-jack-sense-test in previous email
>>
>> Can it measure the impedance of the jacks of your computer ?
>
> It seems that this doesn't work machines here with Realtek codecs.
> So, this must be pretty depending on the codec chip.
>
> Anyway, currently there is no use of impedance, and the jack presence
> can be detected immediately without delay, we can keep the code as
> is now.
>

How can I add the new hda-jack detect to patch_analog.c ?

Only ad1988 use  snd_hda_parse_pin_def_config() to parse the pin,
other ad198x codecs are used model since snd_hda_jack_add_ctls()
require those pin info from autocfg

The auto model of ad1988 use init_verbs ad1988_6stack_init which
cannot handle those 3 stack motherboard asus m2n

What is the reason to call snd_hda_jack_report_sync() at the end of
unsol event handler ?