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/*
* ALSA SoC driver for
* Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
*
* (c) 2013 Daniel Mack <zonque@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
struct ak5386_priv {
int reset_gpio;
};
static struct snd_soc_codec_driver soc_codec_ak5386;
static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
format &= SND_SOC_DAIFMT_FORMAT_MASK;
if (format != SND_SOC_DAIFMT_LEFT_J &&
format != SND_SOC_DAIFMT_I2S) {
dev_err(codec->dev, "Invalid DAI format\n");
return -EINVAL;
}
return 0;
}
static int ak5386_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
/*
* From the datasheet:
*
* All external clocks (MCLK, SCLK and LRCK) must be present unless
* PDN pin = “L”. If these clocks are not provided, the AK5386 may
* draw excess current due to its use of internal dynamically
* refreshed logic. If the external clocks are not present, place
* the AK5386 in power-down mode (PDN pin = “L”).
*/
if (gpio_is_valid(priv->reset_gpio))
gpio_set_value(priv->reset_gpio, 1);
return 0;
}
static int ak5386_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
if (gpio_is_valid(priv->reset_gpio))
gpio_set_value(priv->reset_gpio, 0);
return 0;
}
static const struct snd_soc_dai_ops ak5386_dai_ops = {
.set_fmt = ak5386_set_dai_fmt,
.hw_params = ak5386_hw_params,
.hw_free = ak5386_hw_free,
};
static struct snd_soc_dai_driver ak5386_dai = {
.name = "ak5386-hifi",
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S8 |
SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE |
SNDRV_PCM_FMTBIT_S24_3LE,
},
.ops = &ak5386_dai_ops,
};
#ifdef CONFIG_OF
static const struct of_device_id ak5386_dt_ids[] = {
{ .compatible = "asahi-kasei,ak5386", },
{ }
};
MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
#endif
static int ak5386_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ak5386_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->reset_gpio = -EINVAL;
dev_set_drvdata(dev, priv);
if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
priv->reset_gpio = of_get_named_gpio(dev->of_node,
"reset-gpio", 0);
if (gpio_is_valid(priv->reset_gpio))
if (devm_gpio_request_one(dev, priv->reset_gpio,
GPIOF_OUT_INIT_LOW,
"AK5386 Reset"))
priv->reset_gpio = -EINVAL;
return snd_soc_register_codec(dev, &soc_codec_ak5386,
&ak5386_dai, 1);
}
static int ak5386_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static struct platform_driver ak5386_driver = {
.probe = ak5386_probe,
.remove = ak5386_remove,
.driver = {
.name = "ak5386",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ak5386_dt_ids),
},
};
module_platform_driver(ak5386_driver);
MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
MODULE_LICENSE("GPL");
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