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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         .component_driver = {
 78                 .dapm_widgets           = ak5386_dapm_widgets,
 79                 .num_dapm_widgets       = ARRAY_SIZE(ak5386_dapm_widgets),
 80                 .dapm_routes            = ak5386_dapm_routes,
 81                 .num_dapm_routes        = ARRAY_SIZE(ak5386_dapm_routes),
 82         },
 83 };
 84 
 85 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
 86                               unsigned int format)
 87 {
 88         struct snd_soc_codec *codec = codec_dai->codec;
 89 
 90         format &= SND_SOC_DAIFMT_FORMAT_MASK;
 91         if (format != SND_SOC_DAIFMT_LEFT_J &&
 92             format != SND_SOC_DAIFMT_I2S) {
 93                 dev_err(codec->dev, "Invalid DAI format\n");
 94                 return -EINVAL;
 95         }
 96 
 97         return 0;
 98 }
 99 
100 static int ak5386_hw_params(struct snd_pcm_substream *substream,
101                             struct snd_pcm_hw_params *params,
102                             struct snd_soc_dai *dai)
103 {
104         struct snd_soc_codec *codec = dai->codec;
105         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
106 
107         /*
108          * From the datasheet:
109          *
110          * All external clocks (MCLK, SCLK and LRCK) must be present unless
111          * PDN pin = ā€œLā€. If these clocks are not provided, the AK5386 may
112          * draw excess current due to its use of internal dynamically
113          * refreshed logic. If the external clocks are not present, place
114          * the AK5386 in power-down mode (PDN pin = ā€œLā€).
115          */
116 
117         if (gpio_is_valid(priv->reset_gpio))
118                 gpio_set_value(priv->reset_gpio, 1);
119 
120         return 0;
121 }
122 
123 static int ak5386_hw_free(struct snd_pcm_substream *substream,
124                           struct snd_soc_dai *dai)
125 {
126         struct snd_soc_codec *codec = dai->codec;
127         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
128 
129         if (gpio_is_valid(priv->reset_gpio))
130                 gpio_set_value(priv->reset_gpio, 0);
131 
132         return 0;
133 }
134 
135 static const struct snd_soc_dai_ops ak5386_dai_ops = {
136         .set_fmt        = ak5386_set_dai_fmt,
137         .hw_params      = ak5386_hw_params,
138         .hw_free        = ak5386_hw_free,
139 };
140 
141 static struct snd_soc_dai_driver ak5386_dai = {
142         .name           = "ak5386-hifi",
143         .capture        = {
144                 .stream_name    = "Capture",
145                 .channels_min   = 1,
146                 .channels_max   = 2,
147                 .rates          = SNDRV_PCM_RATE_8000_192000,
148                 .formats        = SNDRV_PCM_FMTBIT_S8     |
149                                   SNDRV_PCM_FMTBIT_S16_LE |
150                                   SNDRV_PCM_FMTBIT_S24_LE |
151                                   SNDRV_PCM_FMTBIT_S24_3LE,
152         },
153         .ops    = &ak5386_dai_ops,
154 };
155 
156 #ifdef CONFIG_OF
157 static const struct of_device_id ak5386_dt_ids[] = {
158         { .compatible = "asahi-kasei,ak5386", },
159         { }
160 };
161 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
162 #endif
163 
164 static int ak5386_probe(struct platform_device *pdev)
165 {
166         struct device *dev = &pdev->dev;
167         struct ak5386_priv *priv;
168         int ret, i;
169 
170         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
171         if (!priv)
172                 return -ENOMEM;
173 
174         priv->reset_gpio = -EINVAL;
175         dev_set_drvdata(dev, priv);
176 
177         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
178                 priv->supplies[i].supply = supply_names[i];
179 
180         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
181                                       priv->supplies);
182         if (ret < 0)
183                 return ret;
184 
185         if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
186                 priv->reset_gpio = of_get_named_gpio(dev->of_node,
187                                                       "reset-gpio", 0);
188 
189         if (gpio_is_valid(priv->reset_gpio))
190                 if (devm_gpio_request_one(dev, priv->reset_gpio,
191                                           GPIOF_OUT_INIT_LOW,
192                                           "AK5386 Reset"))
193                         priv->reset_gpio = -EINVAL;
194 
195         return snd_soc_register_codec(dev, &soc_codec_ak5386,
196                                       &ak5386_dai, 1);
197 }
198 
199 static int ak5386_remove(struct platform_device *pdev)
200 {
201         snd_soc_unregister_codec(&pdev->dev);
202         return 0;
203 }
204 
205 static struct platform_driver ak5386_driver = {
206         .probe          = ak5386_probe,
207         .remove         = ak5386_remove,
208         .driver         = {
209                 .name   = "ak5386",
210                 .of_match_table = of_match_ptr(ak5386_dt_ids),
211         },
212 };
213 
214 module_platform_driver(ak5386_driver);
215 
216 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
217 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
218 MODULE_LICENSE("GPL");
219 

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