ALSA: Jack: handle jack embedded kcontrol creating within ctljack

[firefly-linux-kernel-4.4.55.git] / sound / core / ctljack.c

diff --git a/sound/core/ctljack.c b/sound/core/ctljack.c
index e4b38fbe51dacddf9c69651a0f9be0d636789f58..df7c6cd63c4a62dcc560d9ef319aca98ed0bca8d 100644 (file)
--- a/sound/core/ctljack.c
+++ b/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;
 }