ALSA: jack: implement kctl creating for jack devices

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 series will implement kctls inside the
core jack part, including kctls creating, status changing report, for both
HD-Audio and ASoC jack. This allows non root userspace to read jack status
and act on it.

This patch adds a new API called snd_jack_add_new_kctl(), which will create
a kcontrol, add it to the card, and also attach it to the jack kctl list.

This patch also initialises the jack kctl list after jack is newed, and
reports kctl status when jack insertion/removal events occur.

snd_jack_new() is updated in the following patches to also support creating
phantom jacks and jack kcontrols. We then remove these duplicated features
from HDA jack and have jack kctls handled by core throughout HDA and ASoC.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Modified-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Reveiwed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/sound/jack.h b/include/sound/jack.h
index 218235030ebc..433b13b89125 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;
@@ -86,6 +88,7 @@ struct snd_jack {
 
 int snd_jack_new(struct snd_card *card, const char *id, int type,
                  struct snd_jack **jack);
+int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask);
 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent);
 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
                      int keytype);
@@ -93,13 +96,17 @@ int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
 void snd_jack_report(struct snd_jack *jack, int status);
 
 #else
-
 static inline int snd_jack_new(struct snd_card *card, const char *id, int type,
                                struct snd_jack **jack)
 {
         return 0;
 }
 
+static inline int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
+{
+        return 0;
+}
+
 static inline void snd_jack_set_parent(struct snd_jack *jack,
                                        struct device *parent)
 {