ASoC: Add a notifier for jack status changes

Some systems provide both mechanical and electrical detection of jack
status changes. On such systems power savings can be achieved by only
enabling the electrical detection methods when physical insertion has
been detected.

Begin supporting such systems by providing a notifier for jack status
changes which can be used to trigger any reconfiguration.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index b8bac6ae6244..80dfac162723 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -15,6 +15,7 @@
 
 #include <linux/platform_device.h>
 #include <linux/types.h>
+#include <linux/notifier.h>
 #include <linux/workqueue.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -261,6 +262,10 @@ int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask);
 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
                           struct snd_soc_jack_pin *pins);
+void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
+                                    struct notifier_block *nb);
+void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
+                                      struct notifier_block *nb);
 #ifdef CONFIG_GPIOLIB
 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
                         struct snd_soc_jack_gpio *gpios);
@@ -364,6 +369,7 @@ struct snd_soc_jack {
         struct snd_soc_card *card;
         struct list_head pins;
         int status;
+        struct blocking_notifier_head notifier;
 };
 
 /* SoC PCM stream information */