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 <sound/soc.h> 18 #include <sound/pcm.h> 19 #include <sound/initval.h> 20 21 struct ak5386_priv { 22 int reset_gpio; 23 }; 24 25 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = { 26 SND_SOC_DAPM_INPUT("AINL"), 27 SND_SOC_DAPM_INPUT("AINR"), 28 }; 29 30 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = { 31 { "Capture", NULL, "AINL" }, 32 { "Capture", NULL, "AINR" }, 33 }; 34 35 static struct snd_soc_codec_driver soc_codec_ak5386 = { 36 .dapm_widgets = ak5386_dapm_widgets, 37 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets), 38 .dapm_routes = ak5386_dapm_routes, 39 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes), 40 }; 41 42 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai, 43 unsigned int format) 44 { 45 struct snd_soc_codec *codec = codec_dai->codec; 46 47 format &= SND_SOC_DAIFMT_FORMAT_MASK; 48 if (format != SND_SOC_DAIFMT_LEFT_J && 49 format != SND_SOC_DAIFMT_I2S) { 50 dev_err(codec->dev, "Invalid DAI format\n"); 51 return -EINVAL; 52 } 53 54 return 0; 55 } 56 57 static int ak5386_hw_params(struct snd_pcm_substream *substream, 58 struct snd_pcm_hw_params *params, 59 struct snd_soc_dai *dai) 60 { 61 struct snd_soc_codec *codec = dai->codec; 62 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 63 64 /* 65 * From the datasheet: 66 * 67 * All external clocks (MCLK, SCLK and LRCK) must be present unless 68 * PDN pin = “L”. If these clocks are not provided, the AK5386 may 69 * draw excess current due to its use of internal dynamically 70 * refreshed logic. If the external clocks are not present, place 71 * the AK5386 in power-down mode (PDN pin = “L”). 72 */ 73 74 if (gpio_is_valid(priv->reset_gpio)) 75 gpio_set_value(priv->reset_gpio, 1); 76 77 return 0; 78 } 79 80 static int ak5386_hw_free(struct snd_pcm_substream *substream, 81 struct snd_soc_dai *dai) 82 { 83 struct snd_soc_codec *codec = dai->codec; 84 struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); 85 86 if (gpio_is_valid(priv->reset_gpio)) 87 gpio_set_value(priv->reset_gpio, 0); 88 89 return 0; 90 } 91 92 static const struct snd_soc_dai_ops ak5386_dai_ops = { 93 .set_fmt = ak5386_set_dai_fmt, 94 .hw_params = ak5386_hw_params, 95 .hw_free = ak5386_hw_free, 96 }; 97 98 static struct snd_soc_dai_driver ak5386_dai = { 99 .name = "ak5386-hifi", 100 .capture = { 101 .stream_name = "Capture", 102 .channels_min = 1, 103 .channels_max = 2, 104 .rates = SNDRV_PCM_RATE_8000_192000, 105 .formats = SNDRV_PCM_FMTBIT_S8 | 106 SNDRV_PCM_FMTBIT_S16_LE | 107 SNDRV_PCM_FMTBIT_S24_LE | 108 SNDRV_PCM_FMTBIT_S24_3LE, 109 }, 110 .ops = &ak5386_dai_ops, 111 }; 112 113 #ifdef CONFIG_OF 114 static const struct of_device_id ak5386_dt_ids[] = { 115 { .compatible = "asahi-kasei,ak5386", }, 116 { } 117 }; 118 MODULE_DEVICE_TABLE(of, ak5386_dt_ids); 119 #endif 120 121 static int ak5386_probe(struct platform_device *pdev) 122 { 123 struct device *dev = &pdev->dev; 124 struct ak5386_priv *priv; 125 126 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 127 if (!priv) 128 return -ENOMEM; 129 130 priv->reset_gpio = -EINVAL; 131 dev_set_drvdata(dev, priv); 132 133 if (of_match_device(of_match_ptr(ak5386_dt_ids), dev)) 134 priv->reset_gpio = of_get_named_gpio(dev->of_node, 135 "reset-gpio", 0); 136 137 if (gpio_is_valid(priv->reset_gpio)) 138 if (devm_gpio_request_one(dev, priv->reset_gpio, 139 GPIOF_OUT_INIT_LOW, 140 "AK5386 Reset")) 141 priv->reset_gpio = -EINVAL; 142 143 return snd_soc_register_codec(dev, &soc_codec_ak5386, 144 &ak5386_dai, 1); 145 } 146 147 static int ak5386_remove(struct platform_device *pdev) 148 { 149 snd_soc_unregister_codec(&pdev->dev); 150 return 0; 151 } 152 153 static struct platform_driver ak5386_driver = { 154 .probe = ak5386_probe, 155 .remove = ak5386_remove, 156 .driver = { 157 .name = "ak5386", 158 .owner = THIS_MODULE, 159 .of_match_table = of_match_ptr(ak5386_dt_ids), 160 }, 161 }; 162 163 module_platform_driver(ak5386_driver); 164 165 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); 166 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); 167 MODULE_LICENSE("GPL"); 168