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// SPDX-License-Identifier: GPL-2.0
//
// Analog Devices SSM2305 Amplifier Driver
//
// Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
//
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <sound/soc.h>
#define DRV_NAME "ssm2305"
struct ssm2305 {
/* shutdown gpio */
struct gpio_desc *gpiod_shutdown;
};
static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kctrl, int event)
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct ssm2305 *data = snd_soc_component_get_drvdata(c);
gpiod_set_value_cansleep(data->gpiod_shutdown,
SND_SOC_DAPM_EVENT_ON(event));
return 0;
}
static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
/* Stereo input/output */
SND_SOC_DAPM_INPUT("L_IN"),
SND_SOC_DAPM_INPUT("R_IN"),
SND_SOC_DAPM_OUTPUT("L_OUT"),
SND_SOC_DAPM_OUTPUT("R_OUT"),
SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};
static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
{ "L_OUT", NULL, "L_IN" },
{ "R_OUT", NULL, "R_IN" },
{ "L_IN", NULL, "Power" },
{ "R_IN", NULL, "Power" },
};
static const struct snd_soc_component_driver ssm2305_component_driver = {
.dapm_widgets = ssm2305_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),
.dapm_routes = ssm2305_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),
};
static int ssm2305_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ssm2305 *priv;
/* Allocate the private data */
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
/* Get shutdown gpio */
priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
GPIOD_OUT_LOW);
if (IS_ERR(priv->gpiod_shutdown))
return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown),
"Failed to get 'shutdown' gpio\n");
return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
NULL, 0);
}
#ifdef CONFIG_OF
static const struct of_device_id ssm2305_of_match[] = {
{ .compatible = "adi,ssm2305", },
{ }
};
MODULE_DEVICE_TABLE(of, ssm2305_of_match);
#endif
static struct platform_driver ssm2305_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(ssm2305_of_match),
},
.probe = ssm2305_probe,
};
module_platform_driver(ssm2305_driver);
MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
MODULE_LICENSE("GPL v2");
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