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// SPDX-License-Identifier: GPL-2.0-only
//
// nau8315.c -- NAU8315 ALSA SoC Audio Amplifier Driver
//
// Copyright 2020 Nuvoton Technology Crop.
//
// Author: David Lin <ctlin0@nuvoton.com>
//
// Based on MAX98357A.c
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/soc-dapm.h>
struct nau8315_priv {
struct gpio_desc *enable;
int enpin_switch;
};
static int nau8315_daiops_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct nau8315_priv *nau8315 =
snd_soc_component_get_drvdata(component);
if (!nau8315->enable)
return 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (nau8315->enpin_switch) {
gpiod_set_value(nau8315->enable, 1);
dev_dbg(component->dev, "set enable to 1");
}
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
gpiod_set_value(nau8315->enable, 0);
dev_dbg(component->dev, "set enable to 0");
break;
}
return 0;
}
static int nau8315_enpin_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_component *component =
snd_soc_dapm_to_component(w->dapm);
struct nau8315_priv *nau8315 =
snd_soc_component_get_drvdata(component);
if (event & SND_SOC_DAPM_PRE_PMU)
nau8315->enpin_switch = 1;
else if (event & SND_SOC_DAPM_POST_PMD)
nau8315->enpin_switch = 0;
return 0;
}
static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("Speaker"),
SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0,
nau8315_enpin_event,
SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};
static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
{"EN_Pin", NULL, "HiFi Playback"},
{"Speaker", NULL, "EN_Pin"},
};
static const struct snd_soc_component_driver nau8315_component_driver = {
.dapm_widgets = nau8315_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(nau8315_dapm_widgets),
.dapm_routes = nau8315_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(nau8315_dapm_routes),
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
};
static const struct snd_soc_dai_ops nau8315_dai_ops = {
.trigger = nau8315_daiops_trigger,
};
#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
static struct snd_soc_dai_driver nau8315_dai_driver = {
.name = "nau8315-hifi",
.playback = {
.stream_name = "HiFi Playback",
.formats = NAU8315_FORMATS,
.rates = NAU8315_RATES,
.channels_min = 1,
.channels_max = 2,
},
.ops = &nau8315_dai_ops,
};
static int nau8315_platform_probe(struct platform_device *pdev)
{
struct nau8315_priv *nau8315;
nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
if (!nau8315)
return -ENOMEM;
nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
"enable", GPIOD_OUT_LOW);
if (IS_ERR(nau8315->enable))
return PTR_ERR(nau8315->enable);
dev_set_drvdata(&pdev->dev, nau8315);
return devm_snd_soc_register_component(&pdev->dev,
&nau8315_component_driver,
&nau8315_dai_driver, 1);
}
#ifdef CONFIG_OF
static const struct of_device_id nau8315_device_id[] = {
{ .compatible = "nuvoton,nau8315" },
{}
};
MODULE_DEVICE_TABLE(of, nau8315_device_id);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id nau8315_acpi_match[] = {
{ "NVTN2010", 0 },
{},
};
MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
#endif
static struct platform_driver nau8315_platform_driver = {
.driver = {
.name = "nau8315",
.of_match_table = of_match_ptr(nau8315_device_id),
.acpi_match_table = ACPI_PTR(nau8315_acpi_match),
},
.probe = nau8315_platform_probe,
};
module_platform_driver(nau8315_platform_driver);
MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
MODULE_LICENSE("GPL v2");
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