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114 lines
2.8 KiB
114 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2017 BayLibre, SAS. |
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* Author: Jerome Brunet <[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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#define DRV_NAME "simple-amplifier" |
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struct simple_amp { |
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struct gpio_desc *gpiod_enable; |
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}; |
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static int drv_event(struct snd_soc_dapm_widget *w, |
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struct snd_kcontrol *control, int event) |
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{ |
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struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm); |
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struct simple_amp *priv = snd_soc_component_get_drvdata(c); |
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int val; |
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switch (event) { |
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case SND_SOC_DAPM_POST_PMU: |
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val = 1; |
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break; |
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case SND_SOC_DAPM_PRE_PMD: |
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val = 0; |
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break; |
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default: |
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WARN(1, "Unexpected event"); |
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return -EINVAL; |
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} |
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gpiod_set_value_cansleep(priv->gpiod_enable, val); |
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return 0; |
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} |
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static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = { |
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SND_SOC_DAPM_INPUT("INL"), |
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SND_SOC_DAPM_INPUT("INR"), |
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SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event, |
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(SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)), |
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SND_SOC_DAPM_OUTPUT("OUTL"), |
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SND_SOC_DAPM_OUTPUT("OUTR"), |
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SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0), |
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}; |
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static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = { |
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{ "DRV", NULL, "INL" }, |
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{ "DRV", NULL, "INR" }, |
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{ "OUTL", NULL, "VCC" }, |
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{ "OUTR", NULL, "VCC" }, |
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{ "OUTL", NULL, "DRV" }, |
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{ "OUTR", NULL, "DRV" }, |
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}; |
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static const struct snd_soc_component_driver simple_amp_component_driver = { |
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.dapm_widgets = simple_amp_dapm_widgets, |
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.num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets), |
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.dapm_routes = simple_amp_dapm_routes, |
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.num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes), |
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}; |
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static int simple_amp_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct simple_amp *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 == NULL) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, priv); |
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priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable", |
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GPIOD_OUT_LOW); |
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if (IS_ERR(priv->gpiod_enable)) { |
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err = PTR_ERR(priv->gpiod_enable); |
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if (err != -EPROBE_DEFER) |
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dev_err(dev, "Failed to get 'enable' gpio: %d", err); |
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return err; |
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} |
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return devm_snd_soc_register_component(dev, |
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&simple_amp_component_driver, |
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NULL, 0); |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id simple_amp_ids[] = { |
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{ .compatible = "dioo,dio2125", }, |
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{ .compatible = "simple-audio-amplifier", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, simple_amp_ids); |
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#endif |
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static struct platform_driver simple_amp_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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.of_match_table = of_match_ptr(simple_amp_ids), |
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}, |
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.probe = simple_amp_probe, |
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}; |
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module_platform_driver(simple_amp_driver); |
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MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver"); |
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MODULE_AUTHOR("Jerome Brunet <[email protected]>"); |
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MODULE_LICENSE("GPL");
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