ASoC: core: Add snd_soc_of_parse_pin_switches() from simple-card-utils

The ASoC core already has several helpers to parse card properties
from the device tree. Move the parsing code for "pin-switches" from
simple-card-utils to a shared snd_soc_of_parse_pin_switches() function
so other drivers can also use it to set up pin switches configured in
the device tree.

Cc: Paul Cercueil <[e-mail]>
Signed-off-by: Stephan Gerhold <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/sound/soc.h

···
 			       const char *propname);
 int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 					  const char *propname);
+int snd_soc_of_parse_pin_switches(struct snd_soc_card *card, const char *prop);
 int snd_soc_of_get_slot_mask(struct device_node *np,
 			     const char *prop_name,
 			     unsigned int *mask);

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

···
 int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
 				   char *prefix)
 {
-	const unsigned int nb_controls_max = 16;
-	const char **strings, *control_name;
-	struct snd_kcontrol_new *controls;
-	struct device *dev = card->dev;
-	unsigned int i, nb_controls;
 	char prop[128];
-	int ret;
 
 	if (!prefix)
 		prefix = "";
 
 	snprintf(prop, sizeof(prop), "%s%s", prefix, "pin-switches");
 
-	if (!of_property_read_bool(dev->of_node, prop))
-		return 0;
-
-	strings = devm_kcalloc(dev, nb_controls_max,
-			       sizeof(*strings), GFP_KERNEL);
-	if (!strings)
-		return -ENOMEM;
-
-	ret = of_property_read_string_array(dev->of_node, prop,
-					    strings, nb_controls_max);
-	if (ret < 0)
-		return ret;
-
-	nb_controls = (unsigned int)ret;
-
-	controls = devm_kcalloc(dev, nb_controls,
-				sizeof(*controls), GFP_KERNEL);
-	if (!controls)
-		return -ENOMEM;
-
-	for (i = 0; i < nb_controls; i++) {
-		control_name = devm_kasprintf(dev, GFP_KERNEL,
-					      "%s Switch", strings[i]);
-		if (!control_name)
-			return -ENOMEM;
-
-		controls[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-		controls[i].name = control_name;
-		controls[i].info = snd_soc_dapm_info_pin_switch;
-		controls[i].get = snd_soc_dapm_get_pin_switch;
-		controls[i].put = snd_soc_dapm_put_pin_switch;
-		controls[i].private_value = (unsigned long)strings[i];
-	}
-
-	card->controls = controls;
-	card->num_controls = nb_controls;
-
-	return 0;
+	return snd_soc_of_parse_pin_switches(card, prop);
 }
 EXPORT_SYMBOL_GPL(asoc_simple_parse_pin_switches);
 

sound/soc/soc-core.c

···
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
 
+int snd_soc_of_parse_pin_switches(struct snd_soc_card *card, const char *prop)
+{
+	const unsigned int nb_controls_max = 16;
+	const char **strings, *control_name;
+	struct snd_kcontrol_new *controls;
+	struct device *dev = card->dev;
+	unsigned int i, nb_controls;
+	int ret;
+
+	if (!of_property_read_bool(dev->of_node, prop))
+		return 0;
+
+	strings = devm_kcalloc(dev, nb_controls_max,
+			       sizeof(*strings), GFP_KERNEL);
+	if (!strings)
+		return -ENOMEM;
+
+	ret = of_property_read_string_array(dev->of_node, prop,
+					    strings, nb_controls_max);
+	if (ret < 0)
+		return ret;
+
+	nb_controls = (unsigned int)ret;
+
+	controls = devm_kcalloc(dev, nb_controls,
+				sizeof(*controls), GFP_KERNEL);
+	if (!controls)
+		return -ENOMEM;
+
+	for (i = 0; i < nb_controls; i++) {
+		control_name = devm_kasprintf(dev, GFP_KERNEL,
+					      "%s Switch", strings[i]);
+		if (!control_name)
+			return -ENOMEM;
+
+		controls[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+		controls[i].name = control_name;
+		controls[i].info = snd_soc_dapm_info_pin_switch;
+		controls[i].get = snd_soc_dapm_get_pin_switch;
+		controls[i].put = snd_soc_dapm_put_pin_switch;
+		controls[i].private_value = (unsigned long)strings[i];
+	}
+
+	card->controls = controls;
+	card->num_controls = nb_controls;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_pin_switches);
+
 int snd_soc_of_get_slot_mask(struct device_node *np,
 			     const char *prop_name,
 			     unsigned int *mask)