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
25 struct nau8315_priv {
26 struct gpio_desc *enable;
27 int enpin_switch;
28 };
29
nau8315_daiops_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)30 static 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
nau8315_enpin_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)60 static 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
76 static 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
83 static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
84 {"EN_Pin", NULL, "HiFi Playback"},
85 {"Speaker", NULL, "EN_Pin"},
86 };
87
88 static 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
98 static 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
105 static 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
nau8315_platform_probe(struct platform_device * pdev)117 static 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
138 static const struct of_device_id nau8315_device_id[] = {
139 { .compatible = "nuvoton,nau8315" },
140 {}
141 };
142 MODULE_DEVICE_TABLE(of, nau8315_device_id);
143 #endif
144
145 #ifdef CONFIG_ACPI
146 static const struct acpi_device_id nau8315_acpi_match[] = {
147 { "NVTN2010", 0 },
148 {},
149 };
150 MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
151 #endif
152
153 static struct platform_driver nau8315_platform_driver = {
154 .driver = {
155 .name = "nau8315",
156 .of_match_table = of_match_ptr(nau8315_device_id),
157 .acpi_match_table = ACPI_PTR(nau8315_acpi_match),
158 },
159 .probe = nau8315_platform_probe,
160 };
161 module_platform_driver(nau8315_platform_driver);
162
163 MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
164 MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
165 MODULE_LICENSE("GPL v2");
166