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/module.h>
10#include <linux/slab.h>
11#include <linux/of.h>
12#include <linux/of_gpio.h>
13#include <linux/regulator/consumer.h>
14#include <sound/soc.h>
15#include <sound/pcm.h>
16#include <sound/initval.h>
17
18static const char * const supply_names[] = {
19 "va", "vd"
20};
21
22struct ak5386_priv {
23 int reset_gpio;
24 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
25};
26
27static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
28SND_SOC_DAPM_INPUT("AINL"),
29SND_SOC_DAPM_INPUT("AINR"),
30};
31
32static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
33 { "Capture", NULL, "AINL" },
34 { "Capture", NULL, "AINR" },
35};
36
37static int ak5386_soc_probe(struct snd_soc_component *component)
38{
39 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
40 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
41}
42
43static void ak5386_soc_remove(struct snd_soc_component *component)
44{
45 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
46 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
47}
48
49#ifdef CONFIG_PM
50static int ak5386_soc_suspend(struct snd_soc_component *component)
51{
52 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
53 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
54 return 0;
55}
56
57static int ak5386_soc_resume(struct snd_soc_component *component)
58{
59 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
60 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), consumers: priv->supplies);
61}
62#else
63#define ak5386_soc_suspend NULL
64#define ak5386_soc_resume NULL
65#endif /* CONFIG_PM */
66
67static const struct snd_soc_component_driver soc_component_ak5386 = {
68 .probe = ak5386_soc_probe,
69 .remove = ak5386_soc_remove,
70 .suspend = ak5386_soc_suspend,
71 .resume = ak5386_soc_resume,
72 .dapm_widgets = ak5386_dapm_widgets,
73 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
74 .dapm_routes = ak5386_dapm_routes,
75 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
76 .idle_bias_on = 1,
77 .use_pmdown_time = 1,
78 .endianness = 1,
79};
80
81static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
82 unsigned int format)
83{
84 struct snd_soc_component *component = codec_dai->component;
85
86 format &= SND_SOC_DAIFMT_FORMAT_MASK;
87 if (format != SND_SOC_DAIFMT_LEFT_J &&
88 format != SND_SOC_DAIFMT_I2S) {
89 dev_err(component->dev, "Invalid DAI format\n");
90 return -EINVAL;
91 }
92
93 return 0;
94}
95
96static int ak5386_hw_params(struct snd_pcm_substream *substream,
97 struct snd_pcm_hw_params *params,
98 struct snd_soc_dai *dai)
99{
100 struct snd_soc_component *component = dai->component;
101 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
102
103 /*
104 * From the datasheet:
105 *
106 * All external clocks (MCLK, SCLK and LRCK) must be present unless
107 * PDN pin = “L”. If these clocks are not provided, the AK5386 may
108 * draw excess current due to its use of internal dynamically
109 * refreshed logic. If the external clocks are not present, place
110 * the AK5386 in power-down mode (PDN pin = “L”).
111 */
112
113 if (gpio_is_valid(number: priv->reset_gpio))
114 gpio_set_value(gpio: priv->reset_gpio, value: 1);
115
116 return 0;
117}
118
119static int ak5386_hw_free(struct snd_pcm_substream *substream,
120 struct snd_soc_dai *dai)
121{
122 struct snd_soc_component *component = dai->component;
123 struct ak5386_priv *priv = snd_soc_component_get_drvdata(c: component);
124
125 if (gpio_is_valid(number: priv->reset_gpio))
126 gpio_set_value(gpio: 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 = of_get_named_gpio(np: dev->of_node,
181 list_name: "reset-gpio", index: 0);
182
183 if (gpio_is_valid(number: priv->reset_gpio))
184 if (devm_gpio_request_one(dev, gpio: priv->reset_gpio,
185 GPIOF_OUT_INIT_LOW,
186 label: "AK5386 Reset"))
187 priv->reset_gpio = -EINVAL;
188
189 return devm_snd_soc_register_component(dev, component_driver: &soc_component_ak5386,
190 dai_drv: &ak5386_dai, num_dai: 1);
191}
192
193static struct platform_driver ak5386_driver = {
194 .probe = ak5386_probe,
195 .driver = {
196 .name = "ak5386",
197 .of_match_table = of_match_ptr(ak5386_dt_ids),
198 },
199};
200
201module_platform_driver(ak5386_driver);
202
203MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
204MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
205MODULE_LICENSE("GPL");
206

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