// SPDX-License-Identifier: GPL-2.0
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//
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// Analog Devices SSM2305 Amplifier Driver
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//
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// Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
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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 <sound/soc.h>
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#define DRV_NAME "ssm2305"
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struct ssm2305 {
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/* shutdown gpio */
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struct gpio_desc *gpiod_shutdown;
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};
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static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kctrl, 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 ssm2305 *data = snd_soc_component_get_drvdata(c);
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gpiod_set_value_cansleep(data->gpiod_shutdown,
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SND_SOC_DAPM_EVENT_ON(event));
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return 0;
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}
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static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
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/* Stereo input/output */
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SND_SOC_DAPM_INPUT("L_IN"),
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SND_SOC_DAPM_INPUT("R_IN"),
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SND_SOC_DAPM_OUTPUT("L_OUT"),
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SND_SOC_DAPM_OUTPUT("R_OUT"),
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SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
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SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
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};
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static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
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{ "L_OUT", NULL, "L_IN" },
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{ "R_OUT", NULL, "R_IN" },
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{ "L_IN", NULL, "Power" },
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{ "R_IN", NULL, "Power" },
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};
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static const struct snd_soc_component_driver ssm2305_component_driver = {
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.dapm_widgets = ssm2305_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),
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.dapm_routes = ssm2305_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),
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};
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static int ssm2305_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ssm2305 *priv;
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int err;
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/* Allocate the private data */
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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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platform_set_drvdata(pdev, priv);
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/* Get shutdown gpio */
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priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
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GPIOD_OUT_LOW);
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if (IS_ERR(priv->gpiod_shutdown)) {
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err = PTR_ERR(priv->gpiod_shutdown);
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get 'shutdown' gpio: %d\n",
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err);
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return err;
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}
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return devm_snd_soc_register_component(dev, &ssm2305_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 ssm2305_of_match[] = {
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{ .compatible = "adi,ssm2305", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ssm2305_of_match);
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#endif
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static struct platform_driver ssm2305_driver = {
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.driver = {
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.name = DRV_NAME,
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.of_match_table = of_match_ptr(ssm2305_of_match),
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},
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.probe = ssm2305_probe,
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};
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module_platform_driver(ssm2305_driver);
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MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
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MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
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MODULE_LICENSE("GPL v2");
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