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