Unverified Commit 342fbb75 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Mark Brown
Browse files

ASoC: add simple-mux 



Add a driver for simple mux driven by gpios. It currently only supports one
gpio, muxing one of two inputs to a single output.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201205001508.346439-2-alexandre.belloni@bootlin.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f17a7db2

sound/soc/codecs/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -185,6 +185,7 @@ config SND_SOC_ALL_CODECS 
	imply SND_SOC_SGTL5000

	imply SND_SOC_SI476X

	imply SND_SOC_SIMPLE_AMPLIFIER

	imply SND_SOC_SIMPLE_MUX

	imply SND_SOC_SIRF_AUDIO_CODEC

	imply SND_SOC_SPDIF

	imply SND_SOC_SSM2305
@@ -1266,6 +1267,10 @@ config SND_SOC_SIMPLE_AMPLIFIER 
	tristate "Simple Audio Amplifier"

	select GPIOLIB



config SND_SOC_SIMPLE_MUX

	tristate "Simple Audio Mux"

	select GPIOLIB



config SND_SOC_SIRF_AUDIO_CODEC

	tristate "SiRF SoC internal audio codec"

	select REGMAP_MMIO

sound/soc/codecs/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -312,6 +312,8 @@ snd-soc-tpa6130a2-objs := tpa6130a2.o 
snd-soc-tas2552-objs := tas2552.o

snd-soc-tas2562-objs := tas2562.o

snd-soc-tas2764-objs := tas2764.o

# Mux

snd-soc-simple-mux-objs := simple-mux.o



obj-$(CONFIG_SND_SOC_88PM860X)	+= snd-soc-88pm860x.o

obj-$(CONFIG_SND_SOC_AB8500_CODEC)	+= snd-soc-ab8500-codec.o
@@ -627,3 +629,6 @@ obj-$(CONFIG_SND_SOC_SIMPLE_AMPLIFIER) += snd-soc-simple-amplifier.o 
obj-$(CONFIG_SND_SOC_TPA6130A2)	+= snd-soc-tpa6130a2.o

obj-$(CONFIG_SND_SOC_LPASS_WSA_MACRO)	+= snd-soc-lpass-wsa-macro.o

obj-$(CONFIG_SND_SOC_LPASS_VA_MACRO)	+= snd-soc-lpass-va-macro.o



# Mux

obj-$(CONFIG_SND_SOC_SIMPLE_MUX)	+= snd-soc-simple-mux.o

sound/soc/codecs/simple-mux.c

0 → 100644
+124 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2020 Bootlin SA

 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com>

 */



#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/regulator/consumer.h>

#include <sound/soc.h>



struct simple_mux {

	struct gpio_desc *gpiod_mux;

	unsigned int mux;

};



static const char * const simple_mux_texts[] = {

	"Input 1", "Input 2"

};



static SOC_ENUM_SINGLE_EXT_DECL(simple_mux_enum, simple_mux_texts);



static int simple_mux_control_get(struct snd_kcontrol *kcontrol,

				  struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);

	struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);

	struct simple_mux *priv = snd_soc_component_get_drvdata(c);



	ucontrol->value.enumerated.item[0] = priv->mux;



	return 0;

}



static int simple_mux_control_put(struct snd_kcontrol *kcontrol,

				  struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);

	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;

	struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);

	struct simple_mux *priv = snd_soc_component_get_drvdata(c);



	if (ucontrol->value.enumerated.item[0] > e->items)

		return -EINVAL;



	if (priv->mux == ucontrol->value.enumerated.item[0])

		return 0;



	priv->mux = ucontrol->value.enumerated.item[0];



	gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux);



	return snd_soc_dapm_mux_update_power(dapm, kcontrol,

					     ucontrol->value.enumerated.item[0],

					     e, NULL);

}



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[] = {

	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_OUTPUT("OUT"),

};



static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = {

	{ "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),

};



static int simple_mux_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct simple_mux *priv;

	int err;



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	dev_set_drvdata(dev, priv);



	priv->gpiod_mux = devm_gpiod_get(dev, "mux", GPIOD_OUT_LOW);

	if (IS_ERR(priv->gpiod_mux)) {

		err = PTR_ERR(priv->gpiod_mux);

		if (err != -EPROBE_DEFER)

			dev_err(dev, "Failed to get 'mux' gpio: %d", err);

		return err;

	}



	return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0);

}



#ifdef CONFIG_OF

static const struct of_device_id simple_mux_ids[] = {

	{ .compatible = "simple-audio-mux", },

	{ }

};

MODULE_DEVICE_TABLE(of, simple_mux_ids);

#endif



static struct platform_driver simple_mux_driver = {

	.driver = {

		.name = "simple-mux",

		.of_match_table = of_match_ptr(simple_mux_ids),

	},

	.probe = simple_mux_probe,

};



module_platform_driver(simple_mux_driver);



MODULE_DESCRIPTION("ASoC Simple Audio Mux driver");

MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");

MODULE_LICENSE("GPL");