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(component);
 40	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), 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(component);
 46	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), 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(component);
 53	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), 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(component);
 60	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), 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(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(priv->reset_gpio))
114		gpio_set_value(priv->reset_gpio, 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(component);
124
125	if (gpio_is_valid(priv->reset_gpio))
126		gpio_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 = of_get_named_gpio(dev->of_node,
181					     "reset-gpio", 0);
182
183	if (gpio_is_valid(priv->reset_gpio))
184		if (devm_gpio_request_one(dev, priv->reset_gpio,
185					  GPIOF_OUT_INIT_LOW,
186					  "AK5386 Reset"))
187			priv->reset_gpio = -EINVAL;
188
189	return devm_snd_soc_register_component(dev, &soc_component_ak5386,
190				      &ak5386_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");