[PATCH 1/2] ASoC: simple-audio-mux: enable to select MUX names

[Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>]

Current simple-audio-mux selects MUX by "Input 1" or "Input 2",
it is not user friendly. Adds new "mux-names" property and enable to
select MUX by own names.

Original
	> amixer set "MUX" "Input 1"

Use mux-names
	sound_mux: mux {
		compatible = "simple-audio-mux";
		mux-gpios = <...>;
		mux-names = "Device_A", "Device_B";
	};

	> amixer set "MUX" "Device_A"

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 sound/soc/codecs/simple-mux.c | 55 +++++++++++++++++++++++++----------
 1 file changed, 40 insertions(+), 15 deletions(-)

diff --git a/sound/soc/codecs/simple-mux.c b/sound/soc/codecs/simple-mux.c
index bf67de12d20b..41f982078043 100644
--- a/sound/soc/codecs/simple-mux.c
+++ b/sound/soc/codecs/simple-mux.c
@@ -9,12 +9,21 @@
 #include <linux/regulator/consumer.h>
 #include <sound/soc.h>
 
+#define MUX_TEXT_SIZE	2
+#define MUX_WIDGET_SIZE	4
+#define MUX_ROUTE_SIZE	3
 struct simple_mux {
 	struct gpio_desc *gpiod_mux;
 	unsigned int mux;
+	const char *mux_texts[MUX_TEXT_SIZE];
+	struct soc_enum mux_enum;
+	struct snd_kcontrol_new mux_mux;
+	struct snd_soc_dapm_widget mux_widgets[MUX_WIDGET_SIZE];
+	struct snd_soc_dapm_route mux_routes[MUX_ROUTE_SIZE];
+	struct snd_soc_component_driver mux_driver;
 };
 
-static const char * const simple_mux_texts[] = {
+static const char * const simple_mux_texts[MUX_TEXT_SIZE] = {
 	"Input 1", "Input 2"
 };
 
@@ -66,30 +75,23 @@ static unsigned int simple_mux_read(struct snd_soc_component *component,
 static const struct snd_kcontrol_new simple_mux_mux =
 	SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put);
 
-static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[] = {
+static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[MUX_WIDGET_SIZE] = {
 	SND_SOC_DAPM_INPUT("IN1"),
 	SND_SOC_DAPM_INPUT("IN2"),
-	SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux),
+	SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux), // see simple_mux_probe()
 	SND_SOC_DAPM_OUTPUT("OUT"),
 };
 
-static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = {
+static const struct snd_soc_dapm_route simple_mux_dapm_routes[MUX_ROUTE_SIZE] = {
 	{ "OUT", NULL, "MUX" },
-	{ "MUX", "Input 1", "IN1" },
-	{ "MUX", "Input 2", "IN2" },
-};
-
-static const struct snd_soc_component_driver simple_mux_component_driver = {
-	.dapm_widgets		= simple_mux_dapm_widgets,
-	.num_dapm_widgets	= ARRAY_SIZE(simple_mux_dapm_widgets),
-	.dapm_routes		= simple_mux_dapm_routes,
-	.num_dapm_routes	= ARRAY_SIZE(simple_mux_dapm_routes),
-	.read			= simple_mux_read,
+	{ "MUX", "Input 1", "IN1" }, // see simple_mux_probe()
+	{ "MUX", "Input 2", "IN2" }, // see simple_mux_probe()
 };
 
 static int simple_mux_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
 	struct simple_mux *priv;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -103,7 +105,30 @@ static int simple_mux_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_mux),
 				     "Failed to get 'mux' gpio");
 
-	return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0);
+	/* Copy default settings */
+	memcpy(&priv->mux_texts,	&simple_mux_texts,		sizeof(priv->mux_texts));
+	memcpy(&priv->mux_enum,		&simple_mux_enum,		sizeof(priv->mux_enum));
+	memcpy(&priv->mux_mux,		&simple_mux_mux,		sizeof(priv->mux_mux));
+	memcpy(&priv->mux_widgets,	&simple_mux_dapm_widgets,	sizeof(priv->mux_widgets));
+	memcpy(&priv->mux_routes,	&simple_mux_dapm_routes,	sizeof(priv->mux_routes));
+
+	priv->mux_driver.dapm_widgets		= priv->mux_widgets;
+	priv->mux_driver.num_dapm_widgets	= MUX_WIDGET_SIZE;
+	priv->mux_driver.dapm_routes		= priv->mux_routes;
+	priv->mux_driver.num_dapm_routes	= MUX_ROUTE_SIZE;
+	priv->mux_driver.read			= simple_mux_read;
+
+	/* Overwrite text ("Input 1", "Input 2") if property exists */
+	of_property_read_string_array(np, "mux-names", priv->mux_texts, MUX_TEXT_SIZE);
+
+	/* switch to use priv data instead of default */
+	priv->mux_enum.texts			= priv->mux_texts;
+	priv->mux_mux.private_value		= (unsigned long)&priv->mux_enum;
+	priv->mux_widgets[2].kcontrol_news	= &priv->mux_mux;
+	priv->mux_routes[1].control		= priv->mux_texts[0]; // "Input 1"
+	priv->mux_routes[2].control		= priv->mux_texts[1]; // "Input 2"
+
+	return devm_snd_soc_register_component(dev, &priv->mux_driver, NULL, 0);
 }
 
 #ifdef CONFIG_OF
-- 
2.43.0