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124 lines
3.4 KiB
124 lines
3.4 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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