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342fbb7578
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: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20201205001508.346439-2-alexandre.belloni@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020 Bootlin SA
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* Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <sound/soc.h>
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struct simple_mux {
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struct gpio_desc *gpiod_mux;
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unsigned int mux;
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};
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static const char * const simple_mux_texts[] = {
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"Input 1", "Input 2"
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};
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static SOC_ENUM_SINGLE_EXT_DECL(simple_mux_enum, simple_mux_texts);
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static int simple_mux_control_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
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struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
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struct simple_mux *priv = snd_soc_component_get_drvdata(c);
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ucontrol->value.enumerated.item[0] = priv->mux;
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return 0;
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}
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static int simple_mux_control_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
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struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
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struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
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struct simple_mux *priv = snd_soc_component_get_drvdata(c);
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if (ucontrol->value.enumerated.item[0] > e->items)
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return -EINVAL;
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if (priv->mux == ucontrol->value.enumerated.item[0])
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return 0;
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priv->mux = ucontrol->value.enumerated.item[0];
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gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux);
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return snd_soc_dapm_mux_update_power(dapm, kcontrol,
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ucontrol->value.enumerated.item[0],
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e, NULL);
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}
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static const struct snd_kcontrol_new simple_mux_mux =
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SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put);
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static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("IN1"),
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SND_SOC_DAPM_INPUT("IN2"),
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SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux),
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SND_SOC_DAPM_OUTPUT("OUT"),
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};
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static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = {
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{ "OUT", NULL, "MUX" },
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{ "MUX", "Input 1", "IN1" },
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{ "MUX", "Input 2", "IN2" },
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};
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static const struct snd_soc_component_driver simple_mux_component_driver = {
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.dapm_widgets = simple_mux_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(simple_mux_dapm_widgets),
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.dapm_routes = simple_mux_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(simple_mux_dapm_routes),
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};
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static int simple_mux_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct simple_mux *priv;
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int err;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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dev_set_drvdata(dev, priv);
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priv->gpiod_mux = devm_gpiod_get(dev, "mux", GPIOD_OUT_LOW);
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if (IS_ERR(priv->gpiod_mux)) {
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err = PTR_ERR(priv->gpiod_mux);
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get 'mux' gpio: %d", err);
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return err;
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}
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return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id simple_mux_ids[] = {
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{ .compatible = "simple-audio-mux", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, simple_mux_ids);
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#endif
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static struct platform_driver simple_mux_driver = {
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.driver = {
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.name = "simple-mux",
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.of_match_table = of_match_ptr(simple_mux_ids),
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},
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.probe = simple_mux_probe,
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};
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module_platform_driver(simple_mux_driver);
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MODULE_DESCRIPTION("ASoC Simple Audio Mux driver");
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MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
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MODULE_LICENSE("GPL");
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