nau8315.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2//
  3// nau8315.c  --  NAU8315 ALSA SoC Audio Amplifier Driver
  4//
  5// Copyright 2020 Nuvoton Technology Crop.
  6//
  7// Author: David Lin <ctlin0@nuvoton.com>
  8//
  9// Based on MAX98357A.c
 10
 11#include <linux/acpi.h>
 12#include <linux/device.h>
 13#include <linux/err.h>
 14#include <linux/gpio.h>
 15#include <linux/gpio/consumer.h>
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/of.h>
 19#include <linux/platform_device.h>
 20#include <sound/pcm.h>
 21#include <sound/soc.h>
 22#include <sound/soc-dai.h>
 23#include <sound/soc-dapm.h>
 24
 25struct nau8315_priv {
 26	struct gpio_desc *enable;
 27	int enpin_switch;
 28};
 29
 30static int nau8315_daiops_trigger(struct snd_pcm_substream *substream,
 31		int cmd, struct snd_soc_dai *dai)
 32{
 33	struct snd_soc_component *component = dai->component;
 34	struct nau8315_priv *nau8315 =
 35		snd_soc_component_get_drvdata(component);
 36
 37	if (!nau8315->enable)
 38		return 0;
 39
 40	switch (cmd) {
 41	case SNDRV_PCM_TRIGGER_START:
 42	case SNDRV_PCM_TRIGGER_RESUME:
 43	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 44		if (nau8315->enpin_switch) {
 45			gpiod_set_value(nau8315->enable, 1);
 46			dev_dbg(component->dev, "set enable to 1");
 47		}
 48		break;
 49	case SNDRV_PCM_TRIGGER_STOP:
 50	case SNDRV_PCM_TRIGGER_SUSPEND:
 51	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 52		gpiod_set_value(nau8315->enable, 0);
 53		dev_dbg(component->dev, "set enable to 0");
 54		break;
 55	}
 56
 57	return 0;
 58}
 59
 60static int nau8315_enpin_event(struct snd_soc_dapm_widget *w,
 61		struct snd_kcontrol *kcontrol, int event)
 62{
 63	struct snd_soc_component *component =
 64		snd_soc_dapm_to_component(w->dapm);
 65	struct nau8315_priv *nau8315 =
 66		snd_soc_component_get_drvdata(component);
 67
 68	if (event & SND_SOC_DAPM_PRE_PMU)
 69		nau8315->enpin_switch = 1;
 70	else if (event & SND_SOC_DAPM_POST_PMD)
 71		nau8315->enpin_switch = 0;
 72
 73	return 0;
 74}
 75
 76static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = {
 77	SND_SOC_DAPM_OUTPUT("Speaker"),
 78	SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0,
 79			nau8315_enpin_event,
 80			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 81};
 82
 83static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
 84	{"EN_Pin", NULL, "HiFi Playback"},
 85	{"Speaker", NULL, "EN_Pin"},
 86};
 87
 88static const struct snd_soc_component_driver nau8315_component_driver = {
 89	.dapm_widgets		= nau8315_dapm_widgets,
 90	.num_dapm_widgets	= ARRAY_SIZE(nau8315_dapm_widgets),
 91	.dapm_routes		= nau8315_dapm_routes,
 92	.num_dapm_routes	= ARRAY_SIZE(nau8315_dapm_routes),
 93	.idle_bias_on		= 1,
 94	.use_pmdown_time	= 1,
 95	.endianness		= 1,
 96};
 97
 98static const struct snd_soc_dai_ops nau8315_dai_ops = {
 99	.trigger	= nau8315_daiops_trigger,
100};
101
102#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
103#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
104
105static struct snd_soc_dai_driver nau8315_dai_driver = {
106	.name = "nau8315-hifi",
107	.playback = {
108		.stream_name	= "HiFi Playback",
109		.formats	= NAU8315_FORMATS,
110		.rates		= NAU8315_RATES,
111		.channels_min	= 1,
112		.channels_max	= 2,
113	},
114	.ops    = &nau8315_dai_ops,
115};
116
117static int nau8315_platform_probe(struct platform_device *pdev)
118{
119	struct nau8315_priv *nau8315;
120
121	nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
122	if (!nau8315)
123		return -ENOMEM;
124
125	nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
126				"enable", GPIOD_OUT_LOW);
127	if (IS_ERR(nau8315->enable))
128		return PTR_ERR(nau8315->enable);
129
130	dev_set_drvdata(&pdev->dev, nau8315);
131
132	return devm_snd_soc_register_component(&pdev->dev,
133			&nau8315_component_driver,
134			&nau8315_dai_driver, 1);
135}
136
137#ifdef CONFIG_OF
138static const struct of_device_id nau8315_device_id[] = {
139	{ .compatible = "nuvoton,nau8315" },
140	{ .compatible = "nuvoton,nau8318" },
141	{}
142};
143MODULE_DEVICE_TABLE(of, nau8315_device_id);
144#endif
145
146#ifdef CONFIG_ACPI
147static const struct acpi_device_id nau8315_acpi_match[] = {
148	{ "NVTN2010", 0 },
149	{ "NVTN2012", 0},
150	{},
151};
152MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
153#endif
154
155static struct platform_driver nau8315_platform_driver = {
156	.driver = {
157		.name = "nau8315",
158		.of_match_table = of_match_ptr(nau8315_device_id),
159		.acpi_match_table = ACPI_PTR(nau8315_acpi_match),
160	},
161	.probe	= nau8315_platform_probe,
162};
163module_platform_driver(nau8315_platform_driver);
164
165MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
166MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
167MODULE_LICENSE("GPL v2");