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 .component_driver = { 78 .dapm_widgets = ak5386_dapm_widgets, 79 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets), 80 .dapm_routes = ak5386_dapm_routes, 81 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes), 82 }, 83 }; 84 85 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai, 86 unsigned int format) 87 { 88 struct snd_soc_codec *codec = codec_dai->codec; 89 90 format &= SND_SOC_DAIFMT_FORMAT_MASK; 91 if (format != SND_SOC_DAIFMT_LEFT_J && 92 format != SND_SOC_DAIFMT_I2S) { 93 dev_err(codec->dev, "Invalid DAI format\n"); 94 return -EINVAL; 95 } 96 97 return 0; 98 } 99 100 static int ak5386_hw_params(struct snd_pcm_substream *substream, 101 struct snd_pcm_hw_params *params, 102 struct snd_soc_dai *dai) 103 { 104 struct snd_soc_codec *codec = dai->codec; 105 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 106 107 /* 108 * From the datasheet: 109 * 110 * All external clocks (MCLK, SCLK and LRCK) must be present unless 111 * PDN pin = “L”. If these clocks are not provided, the AK5386 may 112 * draw excess current due to its use of internal dynamically 113 * refreshed logic. If the external clocks are not present, place 114 * the AK5386 in power-down mode (PDN pin = “L”). 115 */ 116 117 if (gpio_is_valid(priv->reset_gpio)) 118 gpio_set_value(priv->reset_gpio, 1); 119 120 return 0; 121 } 122 123 static int ak5386_hw_free(struct snd_pcm_substream *substream, 124 struct snd_soc_dai *dai) 125 { 126 struct snd_soc_codec *codec = dai->codec; 127 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 128 129 if (gpio_is_valid(priv->reset_gpio)) 130 gpio_set_value(priv->reset_gpio, 0); 131 132 return 0; 133 } 134 135 static const struct snd_soc_dai_ops ak5386_dai_ops = { 136 .set_fmt = ak5386_set_dai_fmt, 137 .hw_params = ak5386_hw_params, 138 .hw_free = ak5386_hw_free, 139 }; 140 141 static struct snd_soc_dai_driver ak5386_dai = { 142 .name = "ak5386-hifi", 143 .capture = { 144 .stream_name = "Capture", 145 .channels_min = 1, 146 .channels_max = 2, 147 .rates = SNDRV_PCM_RATE_8000_192000, 148 .formats = SNDRV_PCM_FMTBIT_S8 | 149 SNDRV_PCM_FMTBIT_S16_LE | 150 SNDRV_PCM_FMTBIT_S24_LE | 151 SNDRV_PCM_FMTBIT_S24_3LE, 152 }, 153 .ops = &ak5386_dai_ops, 154 }; 155 156 #ifdef CONFIG_OF 157 static const struct of_device_id ak5386_dt_ids[] = { 158 { .compatible = "asahi-kasei,ak5386", }, 159 { } 160 }; 161 MODULE_DEVICE_TABLE(of, ak5386_dt_ids); 162 #endif 163 164 static int ak5386_probe(struct platform_device *pdev) 165 { 166 struct device *dev = &pdev->dev; 167 struct ak5386_priv *priv; 168 int ret, i; 169 170 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 171 if (!priv) 172 return -ENOMEM; 173 174 priv->reset_gpio = -EINVAL; 175 dev_set_drvdata(dev, priv); 176 177 for (i = 0; i < ARRAY_SIZE(supply_names); i++) 178 priv->supplies[i].supply = supply_names[i]; 179 180 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies), 181 priv->supplies); 182 if (ret < 0) 183 return ret; 184 185 if (of_match_device(of_match_ptr(ak5386_dt_ids), dev)) 186 priv->reset_gpio = of_get_named_gpio(dev->of_node, 187 "reset-gpio", 0); 188 189 if (gpio_is_valid(priv->reset_gpio)) 190 if (devm_gpio_request_one(dev, priv->reset_gpio, 191 GPIOF_OUT_INIT_LOW, 192 "AK5386 Reset")) 193 priv->reset_gpio = -EINVAL; 194 195 return snd_soc_register_codec(dev, &soc_codec_ak5386, 196 &ak5386_dai, 1); 197 } 198 199 static int ak5386_remove(struct platform_device *pdev) 200 { 201 snd_soc_unregister_codec(&pdev->dev); 202 return 0; 203 } 204 205 static struct platform_driver ak5386_driver = { 206 .probe = ak5386_probe, 207 .remove = ak5386_remove, 208 .driver = { 209 .name = "ak5386", 210 .of_match_table = of_match_ptr(ak5386_dt_ids), 211 }, 212 }; 213 214 module_platform_driver(ak5386_driver); 215 216 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); 217 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); 218 MODULE_LICENSE("GPL"); 219