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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ALSA SoC driver for4 * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC5 *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_PM50static 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#else63#define ak5386_soc_suspend NULL64#define ak5386_soc_resume NULL65#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 unless107 * PDN pin = “L”. If these clocks are not provided, the AK5386 may108 * draw excess current due to its use of internal dynamically109 * refreshed logic. If the external clocks are not present, place110 * 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_OF153static const struct of_device_id ak5386_dt_ids[] = {154 { .compatible = "asahi-kasei,ak5386", },155 { }156};157MODULE_DEVICE_TABLE(of, ak5386_dt_ids);158#endif159 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");206