[alsa-devel] [PATCH] ALSA: jack: create jack kcontrols for every jack input device

[Takashi Iwai]

At Thu, 19 Mar 2015 16:40:18 +0800,
Jie Yang wrote:
> 
> From: Liam Girdwood <liam.r.girdwood at linux.intel.com>
> 
> 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/control.h |  2 ++
>  include/sound/jack.h    |  2 ++
>  sound/core/jack.c       | 89 +++++++++++++++++++++++++++++++++++++++++++++++--
>  3 files changed, 91 insertions(+), 2 deletions(-)
>  mode change 100644 => 100755 sound/core/jack.c
> 
> diff --git a/include/sound/control.h b/include/sound/control.h
> index 75f3054..023b70a 100644
> --- a/include/sound/control.h
> +++ b/include/sound/control.h
> @@ -66,6 +66,7 @@ struct snd_kcontrol_volatile {
>  
>  struct snd_kcontrol {
>  	struct list_head list;		/* list of controls */
> +	struct list_head jack_list;		/* list of controls belong to the same jack*/
>  	struct snd_ctl_elem_id id;
>  	unsigned int count;		/* count of same elements */
>  	snd_kcontrol_info_t *info;
> @@ -75,6 +76,7 @@ struct snd_kcontrol {
>  		snd_kcontrol_tlv_rw_t *c;
>  		const unsigned int *p;
>  	} tlv;
> +	unsigned int jack_bit_idx;	/*the corresponding jack type bit index */
>  	unsigned long private_value;
>  	void *private_data;
>  	void (*private_free)(struct snd_kcontrol *kcontrol);

NAK for these additions.  There must be a way to implement without
such *generic* additions in kcontrol.


Takashi