111 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2017 BayLibre, SAS.4 * Author: Jerome Brunet <jbrunet@baylibre.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 DRV_NAME "simple-amplifier"13 14struct simple_amp {15 struct gpio_desc *gpiod_enable;16};17 18static int drv_event(struct snd_soc_dapm_widget *w,19 struct snd_kcontrol *control, int event)20{21 struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);22 struct simple_amp *priv = snd_soc_component_get_drvdata(c);23 int val;24 25 switch (event) {26 case SND_SOC_DAPM_POST_PMU:27 val = 1;28 break;29 case SND_SOC_DAPM_PRE_PMD:30 val = 0;31 break;32 default:33 WARN(1, "Unexpected event");34 return -EINVAL;35 }36 37 gpiod_set_value_cansleep(priv->gpiod_enable, val);38 39 return 0;40}41 42static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {43 SND_SOC_DAPM_INPUT("INL"),44 SND_SOC_DAPM_INPUT("INR"),45 SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,46 (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),47 SND_SOC_DAPM_OUTPUT("OUTL"),48 SND_SOC_DAPM_OUTPUT("OUTR"),49 SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0),50};51 52static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {53 { "DRV", NULL, "INL" },54 { "DRV", NULL, "INR" },55 { "OUTL", NULL, "VCC" },56 { "OUTR", NULL, "VCC" },57 { "OUTL", NULL, "DRV" },58 { "OUTR", NULL, "DRV" },59};60 61static const struct snd_soc_component_driver simple_amp_component_driver = {62 .dapm_widgets = simple_amp_dapm_widgets,63 .num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets),64 .dapm_routes = simple_amp_dapm_routes,65 .num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes),66};67 68static int simple_amp_probe(struct platform_device *pdev)69{70 struct device *dev = &pdev->dev;71 struct simple_amp *priv;72 73 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);74 if (priv == NULL)75 return -ENOMEM;76 platform_set_drvdata(pdev, priv);77 78 priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable",79 GPIOD_OUT_LOW);80 if (IS_ERR(priv->gpiod_enable))81 return dev_err_probe(dev, PTR_ERR(priv->gpiod_enable),82 "Failed to get 'enable' gpio");83 84 return devm_snd_soc_register_component(dev,85 &simple_amp_component_driver,86 NULL, 0);87}88 89#ifdef CONFIG_OF90static const struct of_device_id simple_amp_ids[] = {91 { .compatible = "dioo,dio2125", },92 { .compatible = "simple-audio-amplifier", },93 { }94};95MODULE_DEVICE_TABLE(of, simple_amp_ids);96#endif97 98static struct platform_driver simple_amp_driver = {99 .driver = {100 .name = DRV_NAME,101 .of_match_table = of_match_ptr(simple_amp_ids),102 },103 .probe = simple_amp_probe,104};105 106module_platform_driver(simple_amp_driver);107 108MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");109MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");110MODULE_LICENSE("GPL");111