ALSA: hda - Allow multiple callbacks for jack

So far, hda_jack infrastructure allows only one callback per jack, and
this makes things slightly complicated when a driver wants to assign
multiple tasks to a jack, e.g. the standard auto-mute with a power
up/down sequence.  This can be simplified if the hda_jack accepts
multiple callbacks.

This patch is such an extension: the callback-specific part (the
function and private_data) is split to another struct from
hda_jack_tbl, and multiple such objects can be assigned to a single
hda_jack_tbl entry.

The new struct hda_jack_callback is passed to each callback function
now, thus the patch became bigger than expected.  But these changes
are mostly trivial.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 5 deletions

diff --git a/sound/pci/hda/hda_jack.h b/sound/pci/hda/hda_jack.h
index 668669ce3e52..b41e0a3ea1fb 100644
--- a/sound/pci/hda/hda_jack.h
+++ b/sound/pci/hda/hda_jack.h
@@ -14,14 +14,21 @@
 
 struct auto_pin_cfg;
 struct hda_jack_tbl;
+struct hda_jack_callback;
 
-typedef void (*hda_jack_callback) (struct hda_codec *, struct hda_jack_tbl *);
+typedef void (*hda_jack_callback_fn) (struct hda_codec *, struct hda_jack_callback *);
+
+struct hda_jack_callback {
+	struct hda_jack_tbl *tbl;
+	hda_jack_callback_fn func;
+	unsigned int private_data;	/* arbitrary data */
+	struct hda_jack_callback *next;
+};
 
 struct hda_jack_tbl {
 	hda_nid_t nid;
 	unsigned char tag;		/* unsol event tag */
-	unsigned int private_data;	/* arbitrary data */
-	hda_jack_callback callback;
+	struct hda_jack_callback *callback;
 	/* jack-detection stuff */
 	unsigned int pin_sense;		/* cached pin-sense value */
 	unsigned int jack_detect:1;	/* capable of jack-detection? */
@@ -47,9 +54,9 @@ void snd_hda_jack_tbl_clear(struct hda_codec *codec);
 void snd_hda_jack_set_dirty_all(struct hda_codec *codec);
 
 int snd_hda_jack_detect_enable(struct hda_codec *codec, hda_nid_t nid);
-struct hda_jack_tbl *
+struct hda_jack_callback *
 snd_hda_jack_detect_enable_callback(struct hda_codec *codec, hda_nid_t nid,
-				    hda_jack_callback cb);
+				    hda_jack_callback_fn cb);
 
 int snd_hda_jack_set_gating_jack(struct hda_codec *codec, hda_nid_t gated_nid,
 				 hda_nid_t gating_nid);