1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ALSA SoC driver for
4 * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
5 *
6 * (c) 2013 Daniel Mack <zonque@gmail.com>
7 */
8
9#include <linux/device.h>
10#include <linux/dev_printk.h>
11#include <linux/err.h>
12#include <linux/gpio/consumer.h>
13#include <linux/module.h>
14#include <linux/regulator/consumer.h>
15#include <linux/slab.h>
16#include <sound/soc.h>
17#include <sound/pcm.h>
18#include <sound/initval.h>
19
20static const char * const supply_names[] = {
21 "va", "vd"
22};
23
24struct ak5386_priv {
25 struct gpio_desc *reset_gpio;
26 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
27};
28
29static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
30SND_SOC_DAPM_INPUT("AINL"),
31SND_SOC_DAPM_INPUT("AINR"),
32};
33
34static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
35 { "Capture", NULL, "AINL" },
36 { "Capture", NULL, "AINR" },
37};
38
39static int ak5386_soc_probe(struct snd_soc_component *component)
40{
41 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
42 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
43}
44
45static void ak5386_soc_remove(struct snd_soc_component *component)
46{
47 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
48 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
49}
50
51#ifdef CONFIG_PM
52static int ak5386_soc_suspend(struct snd_soc_component *component)
53{
54 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
55 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
56 return 0;
57}
58
59static int ak5386_soc_resume(struct snd_soc_component *component)
60{
61 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
62 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
63}
64#else
65#define ak5386_soc_suspend NULL
66#define ak5386_soc_resume NULL
67#endif /* CONFIG_PM */
68
69static const struct snd_soc_component_driver soc_component_ak5386 = {
70 .probe = ak5386_soc_probe,
71 .remove = ak5386_soc_remove,
72 .suspend = ak5386_soc_suspend,
73 .resume = ak5386_soc_resume,
74 .dapm_widgets = ak5386_dapm_widgets,
75 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
76 .dapm_routes = ak5386_dapm_routes,
77 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
78 .idle_bias_on = 1,
79 .use_pmdown_time = 1,
80 .endianness = 1,
81};
82
83static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
84 unsigned int format)
85{
86 struct snd_soc_component *component = codec_dai->component;
87
88 format &= SND_SOC_DAIFMT_FORMAT_MASK;
89 if (format != SND_SOC_DAIFMT_LEFT_J &&
90 format != SND_SOC_DAIFMT_I2S) {
91 dev_err(component->dev, "Invalid DAI format\n");
92 return -EINVAL;
93 }
94
95 return 0;
96}
97
98static int ak5386_hw_params(struct snd_pcm_substream *substream,
99 struct snd_pcm_hw_params *params,
100 struct snd_soc_dai *dai)
101{
102 struct snd_soc_component *component = dai->component;
103 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
104
105 /*
106 * From the datasheet:
107 *
108 * All external clocks (MCLK, SCLK and LRCK) must be present unless
109 * PDN pin = “L”. If these clocks are not provided, the AK5386 may
110 * draw excess current due to its use of internal dynamically
111 * refreshed logic. If the external clocks are not present, place
112 * the AK5386 in power-down mode (PDN pin = “L”).
113 */
114
115 gpiod_set_value(desc: priv->reset_gpio, value: 1);
116
117 return 0;
118}
119
120static int ak5386_hw_free(struct snd_pcm_substream *substream,
121 struct snd_soc_dai *dai)
122{
123 struct snd_soc_component *component = dai->component;
124 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
125
126 gpiod_set_value(desc: priv->reset_gpio, value: 0);
127
128 return 0;
129}
130
131static const struct snd_soc_dai_ops ak5386_dai_ops = {
132 .set_fmt = ak5386_set_dai_fmt,
133 .hw_params = ak5386_hw_params,
134 .hw_free = ak5386_hw_free,
135};
136
137static struct snd_soc_dai_driver ak5386_dai = {
138 .name = "ak5386-hifi",
139 .capture = {
140 .stream_name = "Capture",
141 .channels_min = 1,
142 .channels_max = 2,
143 .rates = SNDRV_PCM_RATE_8000_192000,
144 .formats = SNDRV_PCM_FMTBIT_S8 |
145 SNDRV_PCM_FMTBIT_S16_LE |
146 SNDRV_PCM_FMTBIT_S24_LE |
147 SNDRV_PCM_FMTBIT_S24_3LE,
148 },
149 .ops = &ak5386_dai_ops,
150};
151
152#ifdef CONFIG_OF
153static const struct of_device_id ak5386_dt_ids[] = {
154 { .compatible = "asahi-kasei,ak5386", },
155 { }
156};
157MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
158#endif
159
160static int ak5386_probe(struct platform_device *pdev)
161{
162 struct device *dev = &pdev->dev;
163 struct ak5386_priv *priv;
164 int ret, i;
165
166 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
167 if (!priv)
168 return -ENOMEM;
169
170 dev_set_drvdata(dev, data: priv);
171
172 for (i = 0; i < ARRAY_SIZE(supply_names); i++)
173 priv->supplies[i].supply = supply_names[i];
174
175 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
176 consumers: priv->supplies);
177 if (ret < 0)
178 return ret;
179
180 priv->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset", flags: GPIOD_OUT_LOW);
181 if (IS_ERR(ptr: priv->reset_gpio))
182 return dev_err_probe(dev, err: PTR_ERR(ptr: priv->reset_gpio),
183 fmt: "Failed to get AK5386 reset GPIO\n");
184
185 gpiod_set_consumer_name(desc: priv->reset_gpio, name: "AK5386 Reset");
186
187 return devm_snd_soc_register_component(dev, component_driver: &soc_component_ak5386,
188 dai_drv: &ak5386_dai, num_dai: 1);
189}
190
191static struct platform_driver ak5386_driver = {
192 .probe = ak5386_probe,
193 .driver = {
194 .name = "ak5386",
195 .of_match_table = of_match_ptr(ak5386_dt_ids),
196 },
197};
198
199module_platform_driver(ak5386_driver);
200
201MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
202MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
203MODULE_LICENSE("GPL");
204

source code of linux/sound/soc/codecs/ak5386.c