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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 .non_legacy_dai_naming = 1,
97};
98
99static const struct snd_soc_dai_ops nau8315_dai_ops = {
100 .trigger = nau8315_daiops_trigger,
101};
102
103#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
104#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
105
106static struct snd_soc_dai_driver nau8315_dai_driver = {
107 .name = "nau8315-hifi",
108 .playback = {
109 .stream_name = "HiFi Playback",
110 .formats = NAU8315_FORMATS,
111 .rates = NAU8315_RATES,
112 .channels_min = 1,
113 .channels_max = 2,
114 },
115 .ops = &nau8315_dai_ops,
116};
117
118static int nau8315_platform_probe(struct platform_device *pdev)
119{
120 struct nau8315_priv *nau8315;
121
122 nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
123 if (!nau8315)
124 return -ENOMEM;
125
126 nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
127 "enable", GPIOD_OUT_LOW);
128 if (IS_ERR(nau8315->enable))
129 return PTR_ERR(nau8315->enable);
130
131 dev_set_drvdata(&pdev->dev, nau8315);
132
133 return devm_snd_soc_register_component(&pdev->dev,
134 &nau8315_component_driver,
135 &nau8315_dai_driver, 1);
136}
137
138#ifdef CONFIG_OF
139static const struct of_device_id nau8315_device_id[] = {
140 { .compatible = "nuvoton,nau8315" },
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 {},
150};
151MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
152#endif
153
154static struct platform_driver nau8315_platform_driver = {
155 .driver = {
156 .name = "nau8315",
157 .of_match_table = of_match_ptr(nau8315_device_id),
158 .acpi_match_table = ACPI_PTR(nau8315_acpi_match),
159 },
160 .probe = nau8315_platform_probe,
161};
162module_platform_driver(nau8315_platform_driver);
163
164MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
165MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
166MODULE_LICENSE("GPL v2");
167
