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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2020 Bootlin SA4 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com>5 */6 7#include <linux/gpio/consumer.h>8#include <linux/module.h>9#include <linux/regulator/consumer.h>10#include <sound/soc.h>11 12#define MUX_TEXT_SIZE 213#define MUX_WIDGET_SIZE 414#define MUX_ROUTE_SIZE 315struct simple_mux {16 struct gpio_desc *gpiod_mux;17 unsigned int mux;18 const char *mux_texts[MUX_TEXT_SIZE];19 struct soc_enum mux_enum;20 struct snd_kcontrol_new mux_mux;21 struct snd_soc_dapm_widget mux_widgets[MUX_WIDGET_SIZE];22 struct snd_soc_dapm_route mux_routes[MUX_ROUTE_SIZE];23 struct snd_soc_component_driver mux_driver;24};25 26static const char * const simple_mux_texts[MUX_TEXT_SIZE] = {27 "Input 1", "Input 2"28};29 30static SOC_ENUM_SINGLE_EXT_DECL(simple_mux_enum, simple_mux_texts);31 32static int simple_mux_control_get(struct snd_kcontrol *kcontrol,33 struct snd_ctl_elem_value *ucontrol)34{35 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);36 struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);37 struct simple_mux *priv = snd_soc_component_get_drvdata(c);38 39 ucontrol->value.enumerated.item[0] = priv->mux;40 41 return 0;42}43 44static int simple_mux_control_put(struct snd_kcontrol *kcontrol,45 struct snd_ctl_elem_value *ucontrol)46{47 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);48 struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;49 struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);50 struct simple_mux *priv = snd_soc_component_get_drvdata(c);51 52 if (ucontrol->value.enumerated.item[0] > e->items)53 return -EINVAL;54 55 if (priv->mux == ucontrol->value.enumerated.item[0])56 return 0;57 58 priv->mux = ucontrol->value.enumerated.item[0];59 60 gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux);61 62 return snd_soc_dapm_mux_update_power(dapm, kcontrol,63 ucontrol->value.enumerated.item[0],64 e, NULL);65}66 67static unsigned int simple_mux_read(struct snd_soc_component *component,68 unsigned int reg)69{70 struct simple_mux *priv = snd_soc_component_get_drvdata(component);71 72 return priv->mux;73}74 75static const struct snd_kcontrol_new simple_mux_mux =76 SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put);77 78static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[MUX_WIDGET_SIZE] = {79 SND_SOC_DAPM_INPUT("IN1"),80 SND_SOC_DAPM_INPUT("IN2"),81 SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux), // see simple_mux_probe()82 SND_SOC_DAPM_OUTPUT("OUT"),83};84 85static const struct snd_soc_dapm_route simple_mux_dapm_routes[MUX_ROUTE_SIZE] = {86 { "OUT", NULL, "MUX" },87 { "MUX", "Input 1", "IN1" }, // see simple_mux_probe()88 { "MUX", "Input 2", "IN2" }, // see simple_mux_probe()89};90 91static int simple_mux_probe(struct platform_device *pdev)92{93 struct device *dev = &pdev->dev;94 struct device_node *np = dev->of_node;95 struct simple_mux *priv;96 97 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);98 if (!priv)99 return -ENOMEM;100 101 dev_set_drvdata(dev, priv);102 103 priv->gpiod_mux = devm_gpiod_get(dev, "mux", GPIOD_OUT_LOW);104 if (IS_ERR(priv->gpiod_mux))105 return dev_err_probe(dev, PTR_ERR(priv->gpiod_mux),106 "Failed to get 'mux' gpio");107 108 /* Copy default settings */109 memcpy(&priv->mux_texts, &simple_mux_texts, sizeof(priv->mux_texts));110 memcpy(&priv->mux_enum, &simple_mux_enum, sizeof(priv->mux_enum));111 memcpy(&priv->mux_mux, &simple_mux_mux, sizeof(priv->mux_mux));112 memcpy(&priv->mux_widgets, &simple_mux_dapm_widgets, sizeof(priv->mux_widgets));113 memcpy(&priv->mux_routes, &simple_mux_dapm_routes, sizeof(priv->mux_routes));114 115 priv->mux_driver.dapm_widgets = priv->mux_widgets;116 priv->mux_driver.num_dapm_widgets = MUX_WIDGET_SIZE;117 priv->mux_driver.dapm_routes = priv->mux_routes;118 priv->mux_driver.num_dapm_routes = MUX_ROUTE_SIZE;119 priv->mux_driver.read = simple_mux_read;120 121 /* Overwrite text ("Input 1", "Input 2") if property exists */122 of_property_read_string_array(np, "state-labels", priv->mux_texts, MUX_TEXT_SIZE);123 124 /* switch to use priv data instead of default */125 priv->mux_enum.texts = priv->mux_texts;126 priv->mux_mux.private_value = (unsigned long)&priv->mux_enum;127 priv->mux_widgets[2].kcontrol_news = &priv->mux_mux;128 priv->mux_routes[1].control = priv->mux_texts[0]; // "Input 1"129 priv->mux_routes[2].control = priv->mux_texts[1]; // "Input 2"130 131 return devm_snd_soc_register_component(dev, &priv->mux_driver, NULL, 0);132}133 134#ifdef CONFIG_OF135static const struct of_device_id simple_mux_ids[] = {136 { .compatible = "simple-audio-mux", },137 { }138};139MODULE_DEVICE_TABLE(of, simple_mux_ids);140#endif141 142static struct platform_driver simple_mux_driver = {143 .driver = {144 .name = "simple-mux",145 .of_match_table = of_match_ptr(simple_mux_ids),146 },147 .probe = simple_mux_probe,148};149 150module_platform_driver(simple_mux_driver);151 152MODULE_DESCRIPTION("ASoC Simple Audio Mux driver");153MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");154MODULE_LICENSE("GPL");155