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

[Raymond Yau]

>
> Currently the ALSA jack core registers only input devices for each jack
> registered. These jack input devices are not readable by userspace devices
> that run as non root.
>
> This patch adds support for additionally registering jack kcontrol devices
> for every input jack registered. This allows non root userspace to read
> jack status.
>
> Signed-off-by: Liam Girdwood <liam.r.girdwood at linux.intel.com>
> Modified-by: Jie Yang <yang.jie at intel.com>
> Signed-off-by: Jie Yang <yang.jie at intel.com>
> Reveiwed-by: Mark Brown <broonie at kernel.org>
> ---
>  include/sound/jack.h |  8 +++++
>  sound/core/jack.c    | 99
++++++++++++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 105 insertions(+), 2 deletions(-)
>
> diff --git a/include/sound/jack.h b/include/sound/jack.h
> index 2182350..ef0f0ed 100644
> --- a/include/sound/jack.h
> +++ b/include/sound/jack.h
> @@ -73,6 +73,8 @@ enum snd_jack_types {
>
>  struct snd_jack {
>         struct input_dev *input_dev;
> +       struct list_head kctl_list;
> +       struct snd_card *card;
>         int registered;
>         int type;
>         const char *id;
> @@ -82,6 +84,12 @@ struct snd_jack {
>         void (*private_free)(struct snd_jack *);
>  };
>
> +struct snd_jack_kctl {
> +       struct snd_kcontrol *kctl;
> +       struct list_head jack_list;             /* list of controls
belong to the same jack*/

Does it mean that those multi io jacks (line in and mic jacks of desktop)
and those headphone/mic combo jack of netbook have all the input and output
kctls in this list ?