ASoC: simple-card-utils: create jack inputs for aux_devs

Add a generic way to create jack inputs for auxiliary jack detection
drivers (e.g. via i2c, spi), which are not part of any real codec.
The simple-card can be used as combining card driver to add the jacks,
no new one is required.

Create a jack (for input-events) for jack devices in the auxiliary
device list (aux_devs). A device which returns a valid value on
get_jack_type counts as jack device; set_jack is required
to add the jack to the device.
Signed-off-by: Astrid Rost <astrid.rost@axis.com>
Link: https://lore.kernel.org/r/20230123135913.2720991-3-astrid.rost@axis.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/simple_card_utils.h

@@ -69,6 +69,7 @@ struct asoc_simple_priv {
 	} *dai_props;
 	struct asoc_simple_jack hp_jack;
 	struct asoc_simple_jack mic_jack;
+	struct snd_soc_jack *aux_jacks;
 	struct snd_soc_dai_link *dai_link;
 	struct asoc_simple_dai *dais;
 	struct snd_soc_dai_link_component *dlcs;
@@ -187,6 +188,8 @@ int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
 int asoc_simple_init_jack(struct snd_soc_card *card,
 			       struct asoc_simple_jack *sjack,
 			       int is_hp, char *prefix, char *pin);
+int asoc_simple_init_aux_jacks(struct asoc_simple_priv *priv,
+				char *prefix);
 int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 			       struct link_info *li);
 int asoc_simple_remove(struct platform_device *pdev);

sound/soc/generic/simple-card-utils.c

@@ -786,6 +786,55 @@ int asoc_simple_init_jack(struct snd_soc_card *card,
 }
 EXPORT_SYMBOL_GPL(asoc_simple_init_jack);
 
+int asoc_simple_init_aux_jacks(struct asoc_simple_priv *priv, char *prefix)
+{
+	struct snd_soc_card *card = simple_priv_to_card(priv);
+	struct snd_soc_component *component;
+	int found_jack_index = 0;
+	int type = 0;
+	int num = 0;
+	int ret;
+
+	if (priv->aux_jacks)
+		return 0;
+
+	for_each_card_auxs(card, component) {
+		type = snd_soc_component_get_jack_type(component);
+		if (type > 0)
+			num++;
+	}
+	if (num < 1)
+		return 0;
+
+	priv->aux_jacks = devm_kcalloc(card->dev, num,
+				       sizeof(struct snd_soc_jack), GFP_KERNEL);
+	if (!priv->aux_jacks)
+		return -ENOMEM;
+
+	for_each_card_auxs(card, component) {
+		char id[128];
+		struct snd_soc_jack *jack;
+
+		if (found_jack_index >= num)
+			break;
+
+		type = snd_soc_component_get_jack_type(component);
+		if (type <= 0)
+			continue;
+
+		/* create jack */
+		jack = &(priv->aux_jacks[found_jack_index++]);
+		snprintf(id, sizeof(id), "%s-jack", component->name);
+		ret = snd_soc_card_jack_new(card, id, type, jack);
+		if (ret)
+			continue;
+
+		(void)snd_soc_component_set_jack(component, jack, NULL);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(asoc_simple_init_aux_jacks);
+
 int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 			  struct link_info *li)
 {

sound/soc/generic/simple-card.c

@@ -623,6 +623,10 @@ static int simple_soc_probe(struct snd_soc_card *card)
 	if (ret < 0)
 		return ret;
 
+	ret = asoc_simple_init_aux_jacks(priv, PREFIX);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }