summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/nau8315.c
blob: 2b66e3f7a8b7f705928c7dc4956395c050b2b939 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
// 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,
	.non_legacy_dai_naming	= 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");