ak5386.c (5598B)
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/of_device.h> 14#include <linux/regulator/consumer.h> 15#include <sound/soc.h> 16#include <sound/pcm.h> 17#include <sound/initval.h> 18 19static const char * const supply_names[] = { 20 "va", "vd" 21}; 22 23struct ak5386_priv { 24 int reset_gpio; 25 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; 26}; 27 28static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = { 29SND_SOC_DAPM_INPUT("AINL"), 30SND_SOC_DAPM_INPUT("AINR"), 31}; 32 33static const struct snd_soc_dapm_route ak5386_dapm_routes[] = { 34 { "Capture", NULL, "AINL" }, 35 { "Capture", NULL, "AINR" }, 36}; 37 38static int ak5386_soc_probe(struct snd_soc_component *component) 39{ 40 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component); 41 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 42} 43 44static void ak5386_soc_remove(struct snd_soc_component *component) 45{ 46 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component); 47 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 48} 49 50#ifdef CONFIG_PM 51static int ak5386_soc_suspend(struct snd_soc_component *component) 52{ 53 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component); 54 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 55 return 0; 56} 57 58static int ak5386_soc_resume(struct snd_soc_component *component) 59{ 60 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component); 61 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 62} 63#else 64#define ak5386_soc_suspend NULL 65#define ak5386_soc_resume NULL 66#endif /* CONFIG_PM */ 67 68static const struct snd_soc_component_driver soc_component_ak5386 = { 69 .probe = ak5386_soc_probe, 70 .remove = ak5386_soc_remove, 71 .suspend = ak5386_soc_suspend, 72 .resume = ak5386_soc_resume, 73 .dapm_widgets = ak5386_dapm_widgets, 74 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets), 75 .dapm_routes = ak5386_dapm_routes, 76 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes), 77 .idle_bias_on = 1, 78 .use_pmdown_time = 1, 79 .endianness = 1, 80 .non_legacy_dai_naming = 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 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_component *component = dai->component; 125 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component); 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 devm_snd_soc_register_component(dev, &soc_component_ak5386, 194 &ak5386_dai, 1); 195} 196 197static struct platform_driver ak5386_driver = { 198 .probe = ak5386_probe, 199 .driver = { 200 .name = "ak5386", 201 .of_match_table = of_match_ptr(ak5386_dt_ids), 202 }, 203}; 204 205module_platform_driver(ak5386_driver); 206 207MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); 208MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); 209MODULE_LICENSE("GPL");