ALSA: Add support for mechanical jack insertion

Some systems support both mechanical and electrical jack detection,
allowing them to report that a jack is physically present but does
not have any functioning connections. Add a new jack type for these,
allowing user space to report faulty connections.

Thanks to Guillem Jover for the suggestion.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/input.h b/include/linux/input.h
index 7323d2ff5151..abd223b0f586 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -645,6 +645,7 @@ struct input_absinfo {
 #define SW_MICROPHONE_INSERT    0x04  /* set = inserted */
 #define SW_DOCK                 0x05  /* set = plugged into dock */
 #define SW_LINEOUT_INSERT       0x06  /* set = inserted */
+#define SW_JACK_PHYSICAL_INSERT 0x07  /* set = mechanical switch set */
 #define SW_MAX                  0x0f
 #define SW_CNT                  (SW_MAX+1)
 
diff --git a/include/sound/jack.h b/include/sound/jack.h
index 7cb25f4b50bb..2e0315cdd0d6 100644
--- a/include/sound/jack.h
+++ b/include/sound/jack.h
@@ -36,6 +36,7 @@ enum snd_jack_types {
         SND_JACK_MICROPHONE     = 0x0002,
         SND_JACK_HEADSET        = SND_JACK_HEADPHONE | SND_JACK_MICROPHONE,
         SND_JACK_LINEOUT        = 0x0004,
+        SND_JACK_MECHANICAL     = 0x0008, /* If detected separately */
 };
 
 struct snd_jack {
diff --git a/sound/core/jack.c b/sound/core/jack.c
index c4bb9bad3133..6ebd5f12bc50 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -108,6 +108,9 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
         if (type & SND_JACK_MICROPHONE)
                 input_set_capability(jack->input_dev, EV_SW,
                                      SW_MICROPHONE_INSERT);
+        if (type & SND_JACK_MECHANICAL)
+                input_set_capability(jack->input_dev, EV_SW,
+                                     SW_JACK_PHYSICAL_INSERT);
 
         err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
         if (err < 0)
@@ -159,6 +162,9 @@ void snd_jack_report(struct snd_jack *jack, int status)
         if (jack->type & SND_JACK_MICROPHONE)
                 input_report_switch(jack->input_dev, SW_MICROPHONE_INSERT,
                                     status & SND_JACK_MICROPHONE);
+        if (jack->type & SND_JACK_MECHANICAL)
+                input_report_switch(jack->input_dev, SW_JACK_PHYSICAL_INSERT,
+                                    status & SND_JACK_MECHANICAL);
 
         input_sync(jack->input_dev);
 }