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1// SPDX-License-Identifier: GPL-2.02//3// Analog Devices SSM2305 Amplifier Driver4//5// Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>6//7 8#include <linux/gpio/consumer.h>9#include <linux/module.h>10#include <sound/soc.h>11 12#define DRV_NAME "ssm2305"13 14struct ssm2305 {15 /* shutdown gpio */16 struct gpio_desc *gpiod_shutdown;17};18 19static int ssm2305_power_event(struct snd_soc_dapm_widget *w,20 struct snd_kcontrol *kctrl, int event)21{22 struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);23 struct ssm2305 *data = snd_soc_component_get_drvdata(c);24 25 gpiod_set_value_cansleep(data->gpiod_shutdown,26 SND_SOC_DAPM_EVENT_ON(event));27 28 return 0;29}30 31static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {32 /* Stereo input/output */33 SND_SOC_DAPM_INPUT("L_IN"),34 SND_SOC_DAPM_INPUT("R_IN"),35 SND_SOC_DAPM_OUTPUT("L_OUT"),36 SND_SOC_DAPM_OUTPUT("R_OUT"),37 38 SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,39 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),40};41 42static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {43 { "L_OUT", NULL, "L_IN" },44 { "R_OUT", NULL, "R_IN" },45 { "L_IN", NULL, "Power" },46 { "R_IN", NULL, "Power" },47};48 49static const struct snd_soc_component_driver ssm2305_component_driver = {50 .dapm_widgets = ssm2305_dapm_widgets,51 .num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),52 .dapm_routes = ssm2305_dapm_routes,53 .num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),54};55 56static int ssm2305_probe(struct platform_device *pdev)57{58 struct device *dev = &pdev->dev;59 struct ssm2305 *priv;60 61 /* Allocate the private data */62 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);63 if (!priv)64 return -ENOMEM;65 66 platform_set_drvdata(pdev, priv);67 68 /* Get shutdown gpio */69 priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",70 GPIOD_OUT_LOW);71 if (IS_ERR(priv->gpiod_shutdown))72 return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown),73 "Failed to get 'shutdown' gpio\n");74 75 return devm_snd_soc_register_component(dev, &ssm2305_component_driver,76 NULL, 0);77}78 79#ifdef CONFIG_OF80static const struct of_device_id ssm2305_of_match[] = {81 { .compatible = "adi,ssm2305", },82 { }83};84MODULE_DEVICE_TABLE(of, ssm2305_of_match);85#endif86 87static struct platform_driver ssm2305_driver = {88 .driver = {89 .name = DRV_NAME,90 .of_match_table = of_match_ptr(ssm2305_of_match),91 },92 .probe = ssm2305_probe,93};94 95module_platform_driver(ssm2305_driver);96 97MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");98MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");99MODULE_LICENSE("GPL v2");100