| 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 = āLā. 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 = āLā). |
| 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"); |