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

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