ALSA: Jack: handle jack embedded kcontrol creating within ctljack

This patch adds a static method get_available_index() to
allocate the index of new jack kcontrols and also adds
jack_kctl_name_gen() which is used to ensure compatibility
with jack naming by removing " Jack" from some incorrectly
passed names.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/control.h

@@ -252,7 +252,7 @@ void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only);
  * Helper functions for jack-detection controls
  */
 struct snd_kcontrol *
-snd_kctl_jack_new(const char *name, int idx, void *private_data);
+snd_kctl_jack_new(const char *name, void *private_data, struct snd_card *card);
 void snd_kctl_jack_report(struct snd_card *card,
 			  struct snd_kcontrol *kctl, bool status);
 

sound/core/ctljack.c

@@ -31,15 +31,46 @@ static struct snd_kcontrol_new jack_detect_kctl = {
 	.get = jack_detect_kctl_get,
 };
 
+static int get_available_index(struct snd_card *card, const char *name)
+{
+	struct snd_ctl_elem_id sid;
+
+	memset(&sid, 0, sizeof(sid));
+
+	sid.index = 0;
+	sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;
+	strlcpy(sid.name, name, sizeof(sid.name));
+
+	while (snd_ctl_find_id(card, &sid))
+		sid.index++;
+
+	return sid.index;
+}
+
+static void jack_kctl_name_gen(char *name, const char *src_name, int size)
+{
+	size_t count = strlen(src_name);
+	bool need_cat = true;
+
+	/* remove redundant " Jack" from src_name */
+	if (count >= 5)
+		need_cat = strncmp(&src_name[count - 5], " Jack", 5) ? true : false;
+
+	snprintf(name, size, need_cat ? "%s Jack" : "%s", src_name);
+
+}
+
 struct snd_kcontrol *
-snd_kctl_jack_new(const char *name, int idx, void *private_data)
+snd_kctl_jack_new(const char *name, void *private_data, struct snd_card *card)
 {
 	struct snd_kcontrol *kctl;
+
 	kctl = snd_ctl_new1(&jack_detect_kctl, private_data);
 	if (!kctl)
 		return NULL;
-	snprintf(kctl->id.name, sizeof(kctl->id.name), "%s Jack", name);
+
-	kctl->id.index = idx;
+	jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name));
+	kctl->id.index = get_available_index(card, name);
 	kctl->private_value = 0;
 	return kctl;
 }

sound/core/jack.c

@@ -135,7 +135,7 @@ static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const cha
 	struct snd_jack_kctl *jack_kctl;
 	int err;
 
-	kctl = snd_kctl_jack_new(name, 0, card);
+	kctl = snd_kctl_jack_new(name, card, card);
 	if (!kctl)
 		return NULL;
 

sound/pci/hda/hda_jack.c

@@ -402,7 +402,7 @@ static int __snd_hda_jack_add_kctl(struct hda_codec *codec, hda_nid_t nid,
 		return 0;
 	if (jack->kctl)
 		return 0; /* already created */
-	kctl = snd_kctl_jack_new(name, idx, codec);
+	kctl = snd_kctl_jack_new(name, codec, codec->card);
 	if (!kctl)
 		return -ENOMEM;
 	err = snd_hda_ctl_add(codec, nid, kctl);