ak5386.c

  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(component);
 42	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), 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(component);
 48	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), 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(component);
 55	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), 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(component);
 62	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), 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(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(priv->reset_gpio, 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(component);
125
126	gpiod_set_value(priv->reset_gpio, 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, sizeof(*priv), GFP_KERNEL);
167	if (!priv)
168		return -ENOMEM;
169
170	dev_set_drvdata(dev, 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				      priv->supplies);
177	if (ret < 0)
178		return ret;
179
180	priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
181	if (IS_ERR(priv->reset_gpio))
182		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio),
183				     "Failed to get AK5386 reset GPIO\n");
184
185	gpiod_set_consumer_name(priv->reset_gpio, "AK5386 Reset");
186
187	return devm_snd_soc_register_component(dev, &soc_component_ak5386,
188				      &ak5386_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");