1/*
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>
17#include <linux/regulator/consumer.h>
18#include <sound/soc.h>
19#include <sound/pcm.h>
20#include <sound/initval.h>
21
22static const char * const supply_names[] = {
23	"va", "vd"
24};
25
26struct ak5386_priv {
27	int reset_gpio;
28	struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
29};
30
31static 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
41static 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
72static struct snd_soc_codec_driver soc_codec_ak5386 = {
73	.probe = ak5386_soc_probe,
74	.remove = ak5386_soc_remove,
75	.suspend = ak5386_soc_suspend,
76	.resume = ak5386_soc_resume,
77	.dapm_widgets = ak5386_dapm_widgets,
78	.num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
79	.dapm_routes = ak5386_dapm_routes,
80	.num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
81};
82
83static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
84			      unsigned int format)
85{
86	struct snd_soc_codec *codec = codec_dai->codec;
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(codec->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_codec *codec = dai->codec;
103	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
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	if (gpio_is_valid(priv->reset_gpio))
116		gpio_set_value(priv->reset_gpio, 1);
117
118	return 0;
119}
120
121static int ak5386_hw_free(struct snd_pcm_substream *substream,
122			  struct snd_soc_dai *dai)
123{
124	struct snd_soc_codec *codec = dai->codec;
125	struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
126
127	if (gpio_is_valid(priv->reset_gpio))
128		gpio_set_value(priv->reset_gpio, 0);
129
130	return 0;
131}
132
133static const struct snd_soc_dai_ops ak5386_dai_ops = {
134	.set_fmt	= ak5386_set_dai_fmt,
135	.hw_params	= ak5386_hw_params,
136	.hw_free	= ak5386_hw_free,
137};
138
139static struct snd_soc_dai_driver ak5386_dai = {
140	.name		= "ak5386-hifi",
141	.capture	= {
142		.stream_name	= "Capture",
143		.channels_min	= 1,
144		.channels_max	= 2,
145		.rates		= SNDRV_PCM_RATE_8000_192000,
146		.formats	= SNDRV_PCM_FMTBIT_S8     |
147				  SNDRV_PCM_FMTBIT_S16_LE |
148				  SNDRV_PCM_FMTBIT_S24_LE |
149				  SNDRV_PCM_FMTBIT_S24_3LE,
150	},
151	.ops	= &ak5386_dai_ops,
152};
153
154#ifdef CONFIG_OF
155static const struct of_device_id ak5386_dt_ids[] = {
156	{ .compatible = "asahi-kasei,ak5386", },
157	{ }
158};
159MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
160#endif
161
162static int ak5386_probe(struct platform_device *pdev)
163{
164	struct device *dev = &pdev->dev;
165	struct ak5386_priv *priv;
166	int ret, i;
167
168	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
169	if (!priv)
170		return -ENOMEM;
171
172	priv->reset_gpio = -EINVAL;
173	dev_set_drvdata(dev, priv);
174
175	for (i = 0; i < ARRAY_SIZE(supply_names); i++)
176		priv->supplies[i].supply = supply_names[i];
177
178	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
179				      priv->supplies);
180	if (ret < 0)
181		return ret;
182
183	if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
184		priv->reset_gpio = of_get_named_gpio(dev->of_node,
185						      "reset-gpio", 0);
186
187	if (gpio_is_valid(priv->reset_gpio))
188		if (devm_gpio_request_one(dev, priv->reset_gpio,
189					  GPIOF_OUT_INIT_LOW,
190					  "AK5386 Reset"))
191			priv->reset_gpio = -EINVAL;
192
193	return snd_soc_register_codec(dev, &soc_codec_ak5386,
194				      &ak5386_dai, 1);
195}
196
197static int ak5386_remove(struct platform_device *pdev)
198{
199	snd_soc_unregister_codec(&pdev->dev);
200	return 0;
201}
202
203static struct platform_driver ak5386_driver = {
204	.probe		= ak5386_probe,
205	.remove		= ak5386_remove,
206	.driver		= {
207		.name	= "ak5386",
208		.of_match_table = of_match_ptr(ak5386_dt_ids),
209	},
210};
211
212module_platform_driver(ak5386_driver);
213
214MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
215MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
216MODULE_LICENSE("GPL");
217