- 根目录:
- sound
- soc
- codecs
- wm8728.c
/*
* wm8728.c -- WM8728 ALSA SoC Audio driver
*
* Copyright 2008 Wolfson Microelectronics plc
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.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/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include "wm8728.h"
/*
* We can't read the WM8728 register space so we cache them instead.
* Note that the defaults here aren't the physical defaults, we latch
* the volume update bits, mute the output and enable infinite zero
* detect.
*/
static const struct reg_default wm8728_reg_defaults[] = {
{ 0, 0x1ff },
{ 1, 0x1ff },
{ 2, 0x001 },
{ 3, 0x100 },
};
/* codec private data */
struct wm8728_priv {
struct regmap *regmap;
};
static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
static const struct snd_kcontrol_new wm8728_snd_controls[] = {
SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
0, 255, 0, wm8728_tlv),
SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
};
/*
* DAPM controls.
*/
static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_OUTPUT("VOUTL"),
SND_SOC_DAPM_OUTPUT("VOUTR"),
};
static const struct snd_soc_dapm_route wm8728_intercon[] = {
{"VOUTL", NULL, "DAC"},
{"VOUTR", NULL, "DAC"},
};
static int wm8728_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
if (mute)
snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
else
snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
return 0;
}
static int wm8728_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;
u16 dac = snd_soc_read(codec, WM8728_DACCTL);
dac &= ~0x18;
switch (params_width(params)) {
case 16:
break;
case 20:
dac |= 0x10;
break;
case 24:
dac |= 0x08;
break;
default:
return -EINVAL;
}
snd_soc_write(codec, WM8728_DACCTL, dac);
return 0;
}
static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int fmt)
{
struct snd_soc_codec *codec = codec_dai->codec;
u16 iface = snd_soc_read(codec, WM8728_IFCTL);
/* Currently only I2S is supported by the driver, though the
* hardware is more flexible.
*/
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
iface |= 1;
break;
default:
return -EINVAL;
}
/* The hardware only support full slave mode */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
iface &= ~0x22;
break;
case SND_SOC_DAIFMT_IB_NF:
iface |= 0x20;
iface &= ~0x02;
break;
case SND_SOC_DAIFMT_NB_IF:
iface |= 0x02;
iface &= ~0x20;
break;
case SND_SOC_DAIFMT_IB_IF:
iface |= 0x22;
break;
default:
return -EINVAL;
}
snd_soc_write(codec, WM8728_IFCTL, iface);
return 0;
}
static int wm8728_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
u16 reg;
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
case SND_SOC_BIAS_STANDBY:
if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
/* Power everything up... */
reg = snd_soc_read(codec, WM8728_DACCTL);
snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
/* ..then sync in the register cache. */
regcache_sync(wm8728->regmap);
}
break;
case SND_SOC_BIAS_OFF:
reg = snd_soc_read(codec, WM8728_DACCTL);
snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
break;
}
return 0;
}
#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
SNDRV_PCM_FMTBIT_S24_LE)
static const struct snd_soc_dai_ops wm8728_dai_ops = {
.hw_params = wm8728_hw_params,
.digital_mute = wm8728_mute,
.set_fmt = wm8728_set_dai_fmt,
};
static struct snd_soc_dai_driver wm8728_dai = {
.name = "wm8728-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = WM8728_RATES,
.formats = WM8728_FORMATS,
},
.ops = &wm8728_dai_ops,
};
static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
.set_bias_level = wm8728_set_bias_level,
.suspend_bias_off = true,
.controls = wm8728_snd_controls,
.num_controls = ARRAY_SIZE(wm8728_snd_controls),
.dapm_widgets = wm8728_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
.dapm_routes = wm8728_intercon,
.num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
};
static const struct of_device_id wm8728_of_match[] = {
{ .compatible = "wlf,wm8728", },
{ }
};
MODULE_DEVICE_TABLE(of, wm8728_of_match);
static const struct regmap_config wm8728_regmap = {
.reg_bits = 7,
.val_bits = 9,
.max_register = WM8728_IFCTL,
.reg_defaults = wm8728_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
.cache_type = REGCACHE_RBTREE,
};
#if defined(CONFIG_SPI_MASTER)
static int wm8728_spi_probe(struct spi_device *spi)
{
struct wm8728_priv *wm8728;
int ret;
wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
GFP_KERNEL);
if (wm8728 == NULL)
return -ENOMEM;
wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
if (IS_ERR(wm8728->regmap))
return PTR_ERR(wm8728->regmap);
spi_set_drvdata(spi, wm8728);
ret = snd_soc_register_codec(&spi->dev,
&soc_codec_dev_wm8728, &wm8728_dai, 1);
return ret;
}
static int wm8728_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static struct spi_driver wm8728_spi_driver = {
.driver = {
.name = "wm8728",
.of_match_table = wm8728_of_match,
},
.probe = wm8728_spi_probe,
.remove = wm8728_spi_remove,
};
#endif /* CONFIG_SPI_MASTER */
#if IS_ENABLED(CONFIG_I2C)
static int wm8728_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8728_priv *wm8728;
int ret;
wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
GFP_KERNEL);
if (wm8728 == NULL)
return -ENOMEM;
wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
if (IS_ERR(wm8728->regmap))
return PTR_ERR(wm8728->regmap);
i2c_set_clientdata(i2c, wm8728);
ret = snd_soc_register_codec(&i2c->dev,
&soc_codec_dev_wm8728, &wm8728_dai, 1);
return ret;
}
static int wm8728_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
return 0;
}
static const struct i2c_device_id wm8728_i2c_id[] = {
{ "wm8728", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
static struct i2c_driver wm8728_i2c_driver = {
.driver = {
.name = "wm8728",
.of_match_table = wm8728_of_match,
},
.probe = wm8728_i2c_probe,
.remove = wm8728_i2c_remove,
.id_table = wm8728_i2c_id,
};
#endif
static int __init wm8728_modinit(void)
{
int ret = 0;
#if IS_ENABLED(CONFIG_I2C)
ret = i2c_add_driver(&wm8728_i2c_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
ret);
}
#endif
#if defined(CONFIG_SPI_MASTER)
ret = spi_register_driver(&wm8728_spi_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
ret);
}
#endif
return ret;
}
module_init(wm8728_modinit);
static void __exit wm8728_exit(void)
{
#if IS_ENABLED(CONFIG_I2C)
i2c_del_driver(&wm8728_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
spi_unregister_driver(&wm8728_spi_driver);
#endif
}
module_exit(wm8728_exit);
MODULE_DESCRIPTION("ASoC WM8728 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");