1 /* 2 * ALSA SoC driver for 3 * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC 4 * 5 * (c) 2013 Daniel Mack <zonque@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/of.h> 15 #include <linux/of_gpio.h> 16 #include <linux/of_device.h> 17 #include <linux/regulator/consumer.h> 18 #include <sound/soc.h> 19 #include <sound/pcm.h> 20 #include <sound/initval.h> 21 22 static const char * const supply_names[] = { 23 "va", "vd" 24 }; 25 26 struct ak5386_priv { 27 int reset_gpio; 28 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; 29 }; 30 31 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = { 32 SND_SOC_DAPM_INPUT("AINL"), 33 SND_SOC_DAPM_INPUT("AINR"), 34 }; 35 36 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = { 37 { "Capture", NULL, "AINL" }, 38 { "Capture", NULL, "AINR" }, 39 }; 40 41 static int ak5386_soc_probe(struct snd_soc_codec *codec) 42 { 43 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 44 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 45 } 46 47 static int ak5386_soc_remove(struct snd_soc_codec *codec) 48 { 49 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 50 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 51 return 0; 52 } 53 54 #ifdef CONFIG_PM 55 static int ak5386_soc_suspend(struct snd_soc_codec *codec) 56 { 57 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 58 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); 59 return 0; 60 } 61 62 static int ak5386_soc_resume(struct snd_soc_codec *codec) 63 { 64 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 65 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 66 } 67 #else 68 #define ak5386_soc_suspend NULL 69 #define ak5386_soc_resume NULL 70 #endif /* CONFIG_PM */ 71 72 static struct snd_soc_codec_driver soc_codec_ak5386 = { 73 .probe = ak5386_soc_probe, 74 .remove = ak5386_soc_remove, 75 .suspend = ak5386_soc_suspend, 76 .resume = ak5386_soc_resume, 77 .dapm_widgets = ak5386_dapm_widgets, 78 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets), 79 .dapm_routes = ak5386_dapm_routes, 80 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes), 81 }; 82 83 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai, 84 unsigned int format) 85 { 86 struct snd_soc_codec *codec = codec_dai->codec; 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(codec->dev, "Invalid DAI format\n"); 92 return -EINVAL; 93 } 94 95 return 0; 96 } 97 98 static 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_codec *codec = dai->codec; 103 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 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 } 120 121 static int ak5386_hw_free(struct snd_pcm_substream *substream, 122 struct snd_soc_dai *dai) 123 { 124 struct snd_soc_codec *codec = dai->codec; 125 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 126 127 if (gpio_is_valid(priv->reset_gpio)) 128 gpio_set_value(priv->reset_gpio, 0); 129 130 return 0; 131 } 132 133 static 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 }; 138 139 static 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 155 static const struct of_device_id ak5386_dt_ids[] = { 156 { .compatible = "asahi-kasei,ak5386", }, 157 { } 158 }; 159 MODULE_DEVICE_TABLE(of, ak5386_dt_ids); 160 #endif 161 162 static 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 snd_soc_register_codec(dev, &soc_codec_ak5386, 194 &ak5386_dai, 1); 195 } 196 197 static int ak5386_remove(struct platform_device *pdev) 198 { 199 snd_soc_unregister_codec(&pdev->dev); 200 return 0; 201 } 202 203 static struct platform_driver ak5386_driver = { 204 .probe = ak5386_probe, 205 .remove = ak5386_remove, 206 .driver = { 207 .name = "ak5386", 208 .of_match_table = of_match_ptr(ak5386_dt_ids), 209 }, 210 }; 211 212 module_platform_driver(ak5386_driver); 213 214 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); 215 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); 216 MODULE_LICENSE("GPL"); 217