soc/codecs/ak5386.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * ALSA SoC driver for
0004  *    Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
0005  *
0006  * (c) 2013 Daniel Mack <zonque@gmail.com>
0007  */
0008
0009 #include <linux/module.h>
0010 #include <linux/slab.h>
0011 #include <linux/of.h>
0012 #include <linux/of_gpio.h>
0013 #include <linux/of_device.h>
0014 #include <linux/regulator/consumer.h>
0015 #include <sound/soc.h>
0016 #include <sound/pcm.h>
0017 #include <sound/initval.h>
0018
0019 static const char * const supply_names[] = {
0020     "va", "vd"
0021 };
0022
0023 struct ak5386_priv {
0024     int reset_gpio;
0025     struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
0026 };
0027
0028 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
0029 SND_SOC_DAPM_INPUT("AINL"),
0030 SND_SOC_DAPM_INPUT("AINR"),
0031 };
0032
0033 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
0034     { "Capture", NULL, "AINL" },
0035     { "Capture", NULL, "AINR" },
0036 };
0037
0038 static int ak5386_soc_probe(struct snd_soc_component *component)
0039 {
0040     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0041     return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
0042 }
0043
0044 static void ak5386_soc_remove(struct snd_soc_component *component)
0045 {
0046     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0047     regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
0048 }
0049
0050 #ifdef CONFIG_PM
0051 static int ak5386_soc_suspend(struct snd_soc_component *component)
0052 {
0053     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0054     regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
0055     return 0;
0056 }
0057
0058 static int ak5386_soc_resume(struct snd_soc_component *component)
0059 {
0060     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0061     return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
0062 }
0063 #else
0064 #define ak5386_soc_suspend  NULL
0065 #define ak5386_soc_resume   NULL
0066 #endif /* CONFIG_PM */
0067
0068 static const struct snd_soc_component_driver soc_component_ak5386 = {
0069     .probe          = ak5386_soc_probe,
0070     .remove         = ak5386_soc_remove,
0071     .suspend        = ak5386_soc_suspend,
0072     .resume         = ak5386_soc_resume,
0073     .dapm_widgets       = ak5386_dapm_widgets,
0074     .num_dapm_widgets   = ARRAY_SIZE(ak5386_dapm_widgets),
0075     .dapm_routes        = ak5386_dapm_routes,
0076     .num_dapm_routes    = ARRAY_SIZE(ak5386_dapm_routes),
0077     .idle_bias_on       = 1,
0078     .use_pmdown_time    = 1,
0079     .endianness     = 1,
0080 };
0081
0082 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
0083                   unsigned int format)
0084 {
0085     struct snd_soc_component *component = codec_dai->component;
0086
0087     format &= SND_SOC_DAIFMT_FORMAT_MASK;
0088     if (format != SND_SOC_DAIFMT_LEFT_J &&
0089         format != SND_SOC_DAIFMT_I2S) {
0090         dev_err(component->dev, "Invalid DAI format\n");
0091         return -EINVAL;
0092     }
0093
0094     return 0;
0095 }
0096
0097 static int ak5386_hw_params(struct snd_pcm_substream *substream,
0098                 struct snd_pcm_hw_params *params,
0099                 struct snd_soc_dai *dai)
0100 {
0101     struct snd_soc_component *component = dai->component;
0102     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0103
0104     /*
0105      * From the datasheet:
0106      *
0107      * All external clocks (MCLK, SCLK and LRCK) must be present unless
0108      * PDN pin = “L”. If these clocks are not provided, the AK5386 may
0109      * draw excess current due to its use of internal dynamically
0110      * refreshed logic. If the external clocks are not present, place
0111      * the AK5386 in power-down mode (PDN pin = “L”).
0112      */
0113
0114     if (gpio_is_valid(priv->reset_gpio))
0115         gpio_set_value(priv->reset_gpio, 1);
0116
0117     return 0;
0118 }
0119
0120 static int ak5386_hw_free(struct snd_pcm_substream *substream,
0121               struct snd_soc_dai *dai)
0122 {
0123     struct snd_soc_component *component = dai->component;
0124     struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
0125
0126     if (gpio_is_valid(priv->reset_gpio))
0127         gpio_set_value(priv->reset_gpio, 0);
0128
0129     return 0;
0130 }
0131
0132 static const struct snd_soc_dai_ops ak5386_dai_ops = {
0133     .set_fmt    = ak5386_set_dai_fmt,
0134     .hw_params  = ak5386_hw_params,
0135     .hw_free    = ak5386_hw_free,
0136 };
0137
0138 static struct snd_soc_dai_driver ak5386_dai = {
0139     .name       = "ak5386-hifi",
0140     .capture    = {
0141         .stream_name    = "Capture",
0142         .channels_min   = 1,
0143         .channels_max   = 2,
0144         .rates      = SNDRV_PCM_RATE_8000_192000,
0145         .formats    = SNDRV_PCM_FMTBIT_S8     |
0146                   SNDRV_PCM_FMTBIT_S16_LE |
0147                   SNDRV_PCM_FMTBIT_S24_LE |
0148                   SNDRV_PCM_FMTBIT_S24_3LE,
0149     },
0150     .ops    = &ak5386_dai_ops,
0151 };
0152
0153 #ifdef CONFIG_OF
0154 static const struct of_device_id ak5386_dt_ids[] = {
0155     { .compatible = "asahi-kasei,ak5386", },
0156     { }
0157 };
0158 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
0159 #endif
0160
0161 static int ak5386_probe(struct platform_device *pdev)
0162 {
0163     struct device *dev = &pdev->dev;
0164     struct ak5386_priv *priv;
0165     int ret, i;
0166
0167     priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
0168     if (!priv)
0169         return -ENOMEM;
0170
0171     priv->reset_gpio = -EINVAL;
0172     dev_set_drvdata(dev, priv);
0173
0174     for (i = 0; i < ARRAY_SIZE(supply_names); i++)
0175         priv->supplies[i].supply = supply_names[i];
0176
0177     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
0178                       priv->supplies);
0179     if (ret < 0)
0180         return ret;
0181
0182     if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
0183         priv->reset_gpio = of_get_named_gpio(dev->of_node,
0184                               "reset-gpio", 0);
0185
0186     if (gpio_is_valid(priv->reset_gpio))
0187         if (devm_gpio_request_one(dev, priv->reset_gpio,
0188                       GPIOF_OUT_INIT_LOW,
0189                       "AK5386 Reset"))
0190             priv->reset_gpio = -EINVAL;
0191
0192     return devm_snd_soc_register_component(dev, &soc_component_ak5386,
0193                       &ak5386_dai, 1);
0194 }
0195
0196 static struct platform_driver ak5386_driver = {
0197     .probe      = ak5386_probe,
0198     .driver     = {
0199         .name   = "ak5386",
0200         .of_match_table = of_match_ptr(ak5386_dt_ids),
0201     },
0202 };
0203
0204 module_platform_driver(ak5386_driver);
0205
0206 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
0207 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
0208 MODULE_LICENSE("GPL");