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Linux/sound/soc/codecs/ak5386.c

  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 = ā€œLā€. 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 = ā€œLā€).
 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 

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