[RFC][PATCH v4 3/4] alsa: jack: add more jack_kctl debugfs nodes

[Takashi Iwai]

On Mon, 11 Jan 2021 14:05:56 +0100,
Hui Wang wrote:
> 
> Adding 4 more debugfs nodes, users could get more information about
> the jack_kctl from them:
>  - kctl_id, read-only, get jack_kctl->kctl's id
>    sound/card0/HeadphoneJack# cat kctl_id
>    Headphone Jack
> 
>  - mask_bits, read-only, get jack_kctl's events mask_bits
>    sound/card0/HeadphoneJack# cat mask_bits
>    0x0001 HEADPHONE(0x0001)
> 
>  - status, read-only, get jack_kctl's current status
>    headphone unplugged:
>    sound/card0/HeadphoneJack# cat status
>    0x0000
>    headphone plugged:
>    sound/card0/HeadphoneJack# cat status
>    0x0001 HEADPHONE(0x0001)
> 
>  - type, read-only, get jack's supported events type
>    sound/card0/HeadphoneJack# cat type
>    0x0001 HEADPHONE(0x0001)

I believe we should have a proper documentation in Documentation/ to
describe all those.

And the debugfs callbacks could be optimized without malloc as I
mentioned in another mail, too.


thanks,

Takashi