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Daniel Mackcc289be2013-03-08 12:07:28 +01001/*
2 * ALSA SoC driver for
3 * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
4 *
5 * (c) 2013 Daniel Mack <zonque@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/of.h>
15#include <linux/of_gpio.h>
16#include <linux/of_device.h>
Daniel Mackfb668e72014-03-27 21:42:14 +010017#include <linux/regulator/consumer.h>
Daniel Mackcc289be2013-03-08 12:07:28 +010018#include <sound/soc.h>
19#include <sound/pcm.h>
20#include <sound/initval.h>
21
Daniel Mack2ad76542014-03-28 19:05:04 +010022static const char * const supply_names[] = {
Daniel Mackfb668e72014-03-27 21:42:14 +010023 "va", "vd"
24};
25
Daniel Mackcc289be2013-03-08 12:07:28 +010026struct ak5386_priv {
27 int reset_gpio;
Daniel Mackfb668e72014-03-27 21:42:14 +010028 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
Daniel Mackcc289be2013-03-08 12:07:28 +010029};
30
Mark Browndcf14392013-08-11 12:28:56 +010031static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
32SND_SOC_DAPM_INPUT("AINL"),
33SND_SOC_DAPM_INPUT("AINR"),
34};
35
36static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
37 { "Capture", NULL, "AINL" },
38 { "Capture", NULL, "AINR" },
39};
40
Daniel Mackfb668e72014-03-27 21:42:14 +010041static int ak5386_soc_probe(struct snd_soc_codec *codec)
42{
43 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
44 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
45}
46
47static int ak5386_soc_remove(struct snd_soc_codec *codec)
48{
49 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
50 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
51 return 0;
52}
53
54#ifdef CONFIG_PM
55static int ak5386_soc_suspend(struct snd_soc_codec *codec)
56{
57 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
58 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
59 return 0;
60}
61
62static int ak5386_soc_resume(struct snd_soc_codec *codec)
63{
64 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
65 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
66}
67#else
68#define ak5386_soc_suspend NULL
69#define ak5386_soc_resume NULL
70#endif /* CONFIG_PM */
71
Bhumika Goyala180ba42017-08-03 21:30:19 +053072static const struct snd_soc_codec_driver soc_codec_ak5386 = {
Daniel Mackfb668e72014-03-27 21:42:14 +010073 .probe = ak5386_soc_probe,
74 .remove = ak5386_soc_remove,
75 .suspend = ak5386_soc_suspend,
76 .resume = ak5386_soc_resume,
Kuninori Morimoto5bc4f732016-08-08 09:05:56 +000077 .component_driver = {
78 .dapm_widgets = ak5386_dapm_widgets,
79 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
80 .dapm_routes = ak5386_dapm_routes,
81 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
82 },
Mark Browndcf14392013-08-11 12:28:56 +010083};
Daniel Mackcc289be2013-03-08 12:07:28 +010084
85static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
86 unsigned int format)
87{
88 struct snd_soc_codec *codec = codec_dai->codec;
89
90 format &= SND_SOC_DAIFMT_FORMAT_MASK;
91 if (format != SND_SOC_DAIFMT_LEFT_J &&
92 format != SND_SOC_DAIFMT_I2S) {
93 dev_err(codec->dev, "Invalid DAI format\n");
94 return -EINVAL;
95 }
96
97 return 0;
98}
99
100static int ak5386_hw_params(struct snd_pcm_substream *substream,
101 struct snd_pcm_hw_params *params,
102 struct snd_soc_dai *dai)
103{
104 struct snd_soc_codec *codec = dai->codec;
105 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
106
107 /*
108 * From the datasheet:
109 *
110 * All external clocks (MCLK, SCLK and LRCK) must be present unless
111 * PDN pin = ā€œLā€. If these clocks are not provided, the AK5386 may
112 * draw excess current due to its use of internal dynamically
113 * refreshed logic. If the external clocks are not present, place
114 * the AK5386 in power-down mode (PDN pin = ā€œLā€).
115 */
116
117 if (gpio_is_valid(priv->reset_gpio))
118 gpio_set_value(priv->reset_gpio, 1);
119
120 return 0;
121}
122
123static int ak5386_hw_free(struct snd_pcm_substream *substream,
124 struct snd_soc_dai *dai)
125{
126 struct snd_soc_codec *codec = dai->codec;
127 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
128
129 if (gpio_is_valid(priv->reset_gpio))
130 gpio_set_value(priv->reset_gpio, 0);
131
132 return 0;
133}
134
135static const struct snd_soc_dai_ops ak5386_dai_ops = {
136 .set_fmt = ak5386_set_dai_fmt,
137 .hw_params = ak5386_hw_params,
138 .hw_free = ak5386_hw_free,
139};
140
141static struct snd_soc_dai_driver ak5386_dai = {
142 .name = "ak5386-hifi",
143 .capture = {
144 .stream_name = "Capture",
145 .channels_min = 1,
146 .channels_max = 2,
147 .rates = SNDRV_PCM_RATE_8000_192000,
148 .formats = SNDRV_PCM_FMTBIT_S8 |
149 SNDRV_PCM_FMTBIT_S16_LE |
150 SNDRV_PCM_FMTBIT_S24_LE |
151 SNDRV_PCM_FMTBIT_S24_3LE,
152 },
153 .ops = &ak5386_dai_ops,
154};
155
156#ifdef CONFIG_OF
157static const struct of_device_id ak5386_dt_ids[] = {
158 { .compatible = "asahi-kasei,ak5386", },
159 { }
160};
161MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
162#endif
163
164static int ak5386_probe(struct platform_device *pdev)
165{
166 struct device *dev = &pdev->dev;
167 struct ak5386_priv *priv;
Daniel Mackfb668e72014-03-27 21:42:14 +0100168 int ret, i;
Daniel Mackcc289be2013-03-08 12:07:28 +0100169
170 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
171 if (!priv)
172 return -ENOMEM;
173
174 priv->reset_gpio = -EINVAL;
175 dev_set_drvdata(dev, priv);
176
Daniel Mackfb668e72014-03-27 21:42:14 +0100177 for (i = 0; i < ARRAY_SIZE(supply_names); i++)
178 priv->supplies[i].supply = supply_names[i];
179
180 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
181 priv->supplies);
182 if (ret < 0)
183 return ret;
184
Daniel Mackcc289be2013-03-08 12:07:28 +0100185 if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
186 priv->reset_gpio = of_get_named_gpio(dev->of_node,
187 "reset-gpio", 0);
188
189 if (gpio_is_valid(priv->reset_gpio))
190 if (devm_gpio_request_one(dev, priv->reset_gpio,
191 GPIOF_OUT_INIT_LOW,
192 "AK5386 Reset"))
193 priv->reset_gpio = -EINVAL;
194
195 return snd_soc_register_codec(dev, &soc_codec_ak5386,
196 &ak5386_dai, 1);
197}
198
199static int ak5386_remove(struct platform_device *pdev)
200{
201 snd_soc_unregister_codec(&pdev->dev);
202 return 0;
203}
204
205static struct platform_driver ak5386_driver = {
206 .probe = ak5386_probe,
207 .remove = ak5386_remove,
208 .driver = {
209 .name = "ak5386",
Daniel Mackcc289be2013-03-08 12:07:28 +0100210 .of_match_table = of_match_ptr(ak5386_dt_ids),
211 },
212};
213
214module_platform_driver(ak5386_driver);
215
216MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
217MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
218MODULE_LICENSE("GPL");