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WSL2-Linux-Kernel/sound/soc/codecs/cs4271.c

644 строки
18 KiB
C
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/*
* CS4271 ASoC codec driver
*
* Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This driver support CS4271 codec being master or slave, working
* in control port mode, connected either via SPI or I2C.
* The data format accepted is I2S or left-justified.
* DAPM support not implemented.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <sound/cs4271.h>
#define CS4271_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
/*
* CS4271 registers
* High byte represents SPI chip address (0x10) + write command (0)
* Low byte - codec register address
*/
#define CS4271_MODE1 0x2001 /* Mode Control 1 */
#define CS4271_DACCTL 0x2002 /* DAC Control */
#define CS4271_DACVOL 0x2003 /* DAC Volume & Mixing Control */
#define CS4271_VOLA 0x2004 /* DAC Channel A Volume Control */
#define CS4271_VOLB 0x2005 /* DAC Channel B Volume Control */
#define CS4271_ADCCTL 0x2006 /* ADC Control */
#define CS4271_MODE2 0x2007 /* Mode Control 2 */
#define CS4271_CHIPID 0x2008 /* Chip ID */
#define CS4271_FIRSTREG CS4271_MODE1
#define CS4271_LASTREG CS4271_MODE2
#define CS4271_NR_REGS ((CS4271_LASTREG & 0xFF) + 1)
/* Bit masks for the CS4271 registers */
#define CS4271_MODE1_MODE_MASK 0xC0
#define CS4271_MODE1_MODE_1X 0x00
#define CS4271_MODE1_MODE_2X 0x80
#define CS4271_MODE1_MODE_4X 0xC0
#define CS4271_MODE1_DIV_MASK 0x30
#define CS4271_MODE1_DIV_1 0x00
#define CS4271_MODE1_DIV_15 0x10
#define CS4271_MODE1_DIV_2 0x20
#define CS4271_MODE1_DIV_3 0x30
#define CS4271_MODE1_MASTER 0x08
#define CS4271_MODE1_DAC_DIF_MASK 0x07
#define CS4271_MODE1_DAC_DIF_LJ 0x00
#define CS4271_MODE1_DAC_DIF_I2S 0x01
#define CS4271_MODE1_DAC_DIF_RJ16 0x02
#define CS4271_MODE1_DAC_DIF_RJ24 0x03
#define CS4271_MODE1_DAC_DIF_RJ20 0x04
#define CS4271_MODE1_DAC_DIF_RJ18 0x05
#define CS4271_DACCTL_AMUTE 0x80
#define CS4271_DACCTL_IF_SLOW 0x40
#define CS4271_DACCTL_DEM_MASK 0x30
#define CS4271_DACCTL_DEM_DIS 0x00
#define CS4271_DACCTL_DEM_441 0x10
#define CS4271_DACCTL_DEM_48 0x20
#define CS4271_DACCTL_DEM_32 0x30
#define CS4271_DACCTL_SVRU 0x08
#define CS4271_DACCTL_SRD 0x04
#define CS4271_DACCTL_INVA 0x02
#define CS4271_DACCTL_INVB 0x01
#define CS4271_DACVOL_BEQUA 0x40
#define CS4271_DACVOL_SOFT 0x20
#define CS4271_DACVOL_ZEROC 0x10
#define CS4271_DACVOL_ATAPI_MASK 0x0F
#define CS4271_DACVOL_ATAPI_M_M 0x00
#define CS4271_DACVOL_ATAPI_M_BR 0x01
#define CS4271_DACVOL_ATAPI_M_BL 0x02
#define CS4271_DACVOL_ATAPI_M_BLR2 0x03
#define CS4271_DACVOL_ATAPI_AR_M 0x04
#define CS4271_DACVOL_ATAPI_AR_BR 0x05
#define CS4271_DACVOL_ATAPI_AR_BL 0x06
#define CS4271_DACVOL_ATAPI_AR_BLR2 0x07
#define CS4271_DACVOL_ATAPI_AL_M 0x08
#define CS4271_DACVOL_ATAPI_AL_BR 0x09
#define CS4271_DACVOL_ATAPI_AL_BL 0x0A
#define CS4271_DACVOL_ATAPI_AL_BLR2 0x0B
#define CS4271_DACVOL_ATAPI_ALR2_M 0x0C
#define CS4271_DACVOL_ATAPI_ALR2_BR 0x0D
#define CS4271_DACVOL_ATAPI_ALR2_BL 0x0E
#define CS4271_DACVOL_ATAPI_ALR2_BLR2 0x0F
#define CS4271_VOLA_MUTE 0x80
#define CS4271_VOLA_VOL_MASK 0x7F
#define CS4271_VOLB_MUTE 0x80
#define CS4271_VOLB_VOL_MASK 0x7F
#define CS4271_ADCCTL_DITHER16 0x20
#define CS4271_ADCCTL_ADC_DIF_MASK 0x10
#define CS4271_ADCCTL_ADC_DIF_LJ 0x00
#define CS4271_ADCCTL_ADC_DIF_I2S 0x10
#define CS4271_ADCCTL_MUTEA 0x08
#define CS4271_ADCCTL_MUTEB 0x04
#define CS4271_ADCCTL_HPFDA 0x02
#define CS4271_ADCCTL_HPFDB 0x01
#define CS4271_MODE2_LOOP 0x10
#define CS4271_MODE2_MUTECAEQUB 0x08
#define CS4271_MODE2_FREEZE 0x04
#define CS4271_MODE2_CPEN 0x02
#define CS4271_MODE2_PDN 0x01
#define CS4271_CHIPID_PART_MASK 0xF0
#define CS4271_CHIPID_REV_MASK 0x0F
/*
* Default CS4271 power-up configuration
* Array contains non-existing in hw register at address 0
* Array do not include Chip ID, as codec driver does not use
* registers read operations at all
*/
static const u8 cs4271_dflt_reg[CS4271_NR_REGS] = {
0,
0,
CS4271_DACCTL_AMUTE,
CS4271_DACVOL_SOFT | CS4271_DACVOL_ATAPI_AL_BR,
0,
0,
0,
0,
};
struct cs4271_private {
/* SND_SOC_I2C or SND_SOC_SPI */
enum snd_soc_control_type bus_type;
void *control_data;
unsigned int mclk;
bool master;
bool deemph;
/* Current sample rate for de-emphasis control */
int rate;
/* GPIO driving Reset pin, if any */
int gpio_nreset;
/* GPIO that disable serial bus, if any */
int gpio_disable;
};
struct cs4271_clk_cfg {
unsigned int ratio; /* MCLK / sample rate */
u8 speed_mode; /* codec speed mode: 1x, 2x, 4x */
u8 mclk_master; /* ratio bit mask for Master mode */
u8 mclk_slave; /* ratio bit mask for Slave mode */
};
static struct cs4271_clk_cfg cs4271_clk_tab[] = {
{64, CS4271_MODE1_MODE_4X, CS4271_MODE1_DIV_1, CS4271_MODE1_DIV_1},
{96, CS4271_MODE1_MODE_4X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
{128, CS4271_MODE1_MODE_2X, CS4271_MODE1_DIV_1, CS4271_MODE1_DIV_1},
{192, CS4271_MODE1_MODE_2X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
{256, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_1, CS4271_MODE1_DIV_1},
{384, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_15, CS4271_MODE1_DIV_1},
{512, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_2, CS4271_MODE1_DIV_1},
{768, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_3, CS4271_MODE1_DIV_3},
{1024, CS4271_MODE1_MODE_1X, CS4271_MODE1_DIV_3, CS4271_MODE1_DIV_3}
};
#define CS4171_NR_RATIOS ARRAY_SIZE(cs4271_clk_tab)
/*
* @freq is the desired MCLK rate
* MCLK rate should (c) be the sample rate, multiplied by one of the
* ratios listed in cs4271_mclk_fs_ratios table
*/
static int cs4271_set_dai_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
cs4271->mclk = freq;
return 0;
}
static int cs4271_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
unsigned int val = 0;
int ret;
switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
cs4271->master = 0;
break;
case SND_SOC_DAIFMT_CBM_CFM:
cs4271->master = 1;
val |= CS4271_MODE1_MASTER;
break;
default:
dev_err(codec->dev, "Invalid DAI format\n");
return -EINVAL;
}
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_LEFT_J:
val |= CS4271_MODE1_DAC_DIF_LJ;
ret = snd_soc_update_bits(codec, CS4271_ADCCTL,
CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_LJ);
if (ret < 0)
return ret;
break;
case SND_SOC_DAIFMT_I2S:
val |= CS4271_MODE1_DAC_DIF_I2S;
ret = snd_soc_update_bits(codec, CS4271_ADCCTL,
CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_I2S);
if (ret < 0)
return ret;
break;
default:
dev_err(codec->dev, "Invalid DAI format\n");
return -EINVAL;
}
ret = snd_soc_update_bits(codec, CS4271_MODE1,
CS4271_MODE1_DAC_DIF_MASK | CS4271_MODE1_MASTER, val);
if (ret < 0)
return ret;
return 0;
}
static int cs4271_deemph[] = {0, 44100, 48000, 32000};
static int cs4271_set_deemph(struct snd_soc_codec *codec)
{
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
int i, ret;
int val = CS4271_DACCTL_DEM_DIS;
if (cs4271->deemph) {
/* Find closest de-emphasis freq */
val = 1;
for (i = 2; i < ARRAY_SIZE(cs4271_deemph); i++)
if (abs(cs4271_deemph[i] - cs4271->rate) <
abs(cs4271_deemph[val] - cs4271->rate))
val = i;
val <<= 4;
}
ret = snd_soc_update_bits(codec, CS4271_DACCTL,
CS4271_DACCTL_DEM_MASK, val);
if (ret < 0)
return ret;
return 0;
}
static int cs4271_get_deemph(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
ucontrol->value.enumerated.item[0] = cs4271->deemph;
return 0;
}
static int cs4271_put_deemph(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
cs4271->deemph = ucontrol->value.enumerated.item[0];
return cs4271_set_deemph(codec);
}
static int cs4271_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_codec *codec = rtd->codec;
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
int i, ret;
unsigned int ratio, val;
cs4271->rate = params_rate(params);
ratio = cs4271->mclk / cs4271->rate;
for (i = 0; i < CS4171_NR_RATIOS; i++)
if (cs4271_clk_tab[i].ratio == ratio)
break;
if ((i == CS4171_NR_RATIOS) || ((ratio == 1024) && cs4271->master)) {
dev_err(codec->dev, "Invalid sample rate\n");
return -EINVAL;
}
/* Configure DAC */
val = cs4271_clk_tab[i].speed_mode;
if (cs4271->master)
val |= cs4271_clk_tab[i].mclk_master;
else
val |= cs4271_clk_tab[i].mclk_slave;
ret = snd_soc_update_bits(codec, CS4271_MODE1,
CS4271_MODE1_MODE_MASK | CS4271_MODE1_DIV_MASK, val);
if (ret < 0)
return ret;
return cs4271_set_deemph(codec);
}
static int cs4271_digital_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
int ret;
int val_a = 0;
int val_b = 0;
if (mute) {
val_a = CS4271_VOLA_MUTE;
val_b = CS4271_VOLB_MUTE;
}
ret = snd_soc_update_bits(codec, CS4271_VOLA, CS4271_VOLA_MUTE, val_a);
if (ret < 0)
return ret;
ret = snd_soc_update_bits(codec, CS4271_VOLB, CS4271_VOLB_MUTE, val_b);
if (ret < 0)
return ret;
return 0;
}
/* CS4271 controls */
static DECLARE_TLV_DB_SCALE(cs4271_dac_tlv, -12700, 100, 0);
static const struct snd_kcontrol_new cs4271_snd_controls[] = {
SOC_DOUBLE_R_TLV("Master Playback Volume", CS4271_VOLA, CS4271_VOLB,
0, 0x7F, 1, cs4271_dac_tlv),
SOC_SINGLE("Digital Loopback Switch", CS4271_MODE2, 4, 1, 0),
SOC_SINGLE("Soft Ramp Switch", CS4271_DACVOL, 5, 1, 0),
SOC_SINGLE("Zero Cross Switch", CS4271_DACVOL, 4, 1, 0),
SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
cs4271_get_deemph, cs4271_put_deemph),
SOC_SINGLE("Auto-Mute Switch", CS4271_DACCTL, 7, 1, 0),
SOC_SINGLE("Slow Roll Off Filter Switch", CS4271_DACCTL, 6, 1, 0),
SOC_SINGLE("Soft Volume Ramp-Up Switch", CS4271_DACCTL, 3, 1, 0),
SOC_SINGLE("Soft Ramp-Down Switch", CS4271_DACCTL, 2, 1, 0),
SOC_SINGLE("Left Channel Inversion Switch", CS4271_DACCTL, 1, 1, 0),
SOC_SINGLE("Right Channel Inversion Switch", CS4271_DACCTL, 0, 1, 0),
SOC_DOUBLE("Master Capture Switch", CS4271_ADCCTL, 3, 2, 1, 1),
SOC_SINGLE("Dither 16-Bit Data Switch", CS4271_ADCCTL, 5, 1, 0),
SOC_DOUBLE("High Pass Filter Switch", CS4271_ADCCTL, 1, 0, 1, 1),
SOC_DOUBLE_R("Master Playback Switch", CS4271_VOLA, CS4271_VOLB,
7, 1, 1),
};
static struct snd_soc_dai_ops cs4271_dai_ops = {
.hw_params = cs4271_hw_params,
.set_sysclk = cs4271_set_dai_sysclk,
.set_fmt = cs4271_set_dai_fmt,
.digital_mute = cs4271_digital_mute,
};
static struct snd_soc_dai_driver cs4271_dai = {
.name = "cs4271-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = CS4271_PCM_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = CS4271_PCM_FORMATS,
},
.ops = &cs4271_dai_ops,
.symmetric_rates = 1,
};
#ifdef CONFIG_PM
static int cs4271_soc_suspend(struct snd_soc_codec *codec, pm_message_t mesg)
{
int ret;
/* Set power-down bit */
ret = snd_soc_update_bits(codec, CS4271_MODE2, 0, CS4271_MODE2_PDN);
if (ret < 0)
return ret;
return 0;
}
static int cs4271_soc_resume(struct snd_soc_codec *codec)
{
int ret;
/* Restore codec state */
ret = snd_soc_cache_sync(codec);
if (ret < 0)
return ret;
/* then disable the power-down bit */
ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0);
if (ret < 0)
return ret;
return 0;
}
#else
#define cs4271_soc_suspend NULL
#define cs4271_soc_resume NULL
#endif /* CONFIG_PM */
static int cs4271_probe(struct snd_soc_codec *codec)
{
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
struct cs4271_platform_data *cs4271plat = codec->dev->platform_data;
int ret;
int gpio_nreset = -EINVAL;
codec->control_data = cs4271->control_data;
if (cs4271plat && gpio_is_valid(cs4271plat->gpio_nreset))
gpio_nreset = cs4271plat->gpio_nreset;
if (gpio_nreset >= 0)
if (gpio_request(gpio_nreset, "CS4271 Reset"))
gpio_nreset = -EINVAL;
if (gpio_nreset >= 0) {
/* Reset codec */
gpio_direction_output(gpio_nreset, 0);
udelay(1);
gpio_set_value(gpio_nreset, 1);
/* Give the codec time to wake up */
udelay(1);
}
cs4271->gpio_nreset = gpio_nreset;
/*
* In case of I2C, chip address specified in board data.
* So cache IO operations use 8 bit codec register address.
* In case of SPI, chip address and register address
* passed together as 16 bit value.
* Anyway, register address is masked with 0xFF inside
* soc-cache code.
*/
if (cs4271->bus_type == SND_SOC_SPI)
ret = snd_soc_codec_set_cache_io(codec, 16, 8,
cs4271->bus_type);
else
ret = snd_soc_codec_set_cache_io(codec, 8, 8,
cs4271->bus_type);
if (ret) {
dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
return ret;
}
ret = snd_soc_update_bits(codec, CS4271_MODE2, 0,
CS4271_MODE2_PDN | CS4271_MODE2_CPEN);
if (ret < 0)
return ret;
ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0);
if (ret < 0)
return ret;
/* Power-up sequence requires 85 uS */
udelay(85);
return snd_soc_add_controls(codec, cs4271_snd_controls,
ARRAY_SIZE(cs4271_snd_controls));
}
static int cs4271_remove(struct snd_soc_codec *codec)
{
struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec);
int gpio_nreset;
gpio_nreset = cs4271->gpio_nreset;
if (gpio_is_valid(gpio_nreset)) {
/* Set codec to the reset state */
gpio_set_value(gpio_nreset, 0);
gpio_free(gpio_nreset);
}
return 0;
};
static struct snd_soc_codec_driver soc_codec_dev_cs4271 = {
.probe = cs4271_probe,
.remove = cs4271_remove,
.suspend = cs4271_soc_suspend,
.resume = cs4271_soc_resume,
.reg_cache_default = cs4271_dflt_reg,
.reg_cache_size = ARRAY_SIZE(cs4271_dflt_reg),
.reg_word_size = sizeof(cs4271_dflt_reg[0]),
.compress_type = SND_SOC_FLAT_COMPRESSION,
};
#if defined(CONFIG_SPI_MASTER)
static int __devinit cs4271_spi_probe(struct spi_device *spi)
{
struct cs4271_private *cs4271;
cs4271 = devm_kzalloc(&spi->dev, sizeof(*cs4271), GFP_KERNEL);
if (!cs4271)
return -ENOMEM;
spi_set_drvdata(spi, cs4271);
cs4271->control_data = spi;
cs4271->bus_type = SND_SOC_SPI;
return snd_soc_register_codec(&spi->dev, &soc_codec_dev_cs4271,
&cs4271_dai, 1);
}
static int __devexit cs4271_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static struct spi_driver cs4271_spi_driver = {
.driver = {
.name = "cs4271",
.owner = THIS_MODULE,
},
.probe = cs4271_spi_probe,
.remove = __devexit_p(cs4271_spi_remove),
};
#endif /* defined(CONFIG_SPI_MASTER) */
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static struct i2c_device_id cs4271_i2c_id[] = {
{"cs4271", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, cs4271_i2c_id);
static int __devinit cs4271_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cs4271_private *cs4271;
cs4271 = devm_kzalloc(&client->dev, sizeof(*cs4271), GFP_KERNEL);
if (!cs4271)
return -ENOMEM;
i2c_set_clientdata(client, cs4271);
cs4271->control_data = client;
cs4271->bus_type = SND_SOC_I2C;
return snd_soc_register_codec(&client->dev, &soc_codec_dev_cs4271,
&cs4271_dai, 1);
}
static int __devexit cs4271_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
return 0;
}
static struct i2c_driver cs4271_i2c_driver = {
.driver = {
.name = "cs4271",
.owner = THIS_MODULE,
},
.id_table = cs4271_i2c_id,
.probe = cs4271_i2c_probe,
.remove = __devexit_p(cs4271_i2c_remove),
};
#endif /* defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) */
/*
* We only register our serial bus driver here without
* assignment to particular chip. So if any of the below
* fails, there is some problem with I2C or SPI subsystem.
* In most cases this module will be compiled with support
* of only one serial bus.
*/
static int __init cs4271_modinit(void)
{
int ret;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
ret = i2c_add_driver(&cs4271_i2c_driver);
if (ret) {
pr_err("Failed to register CS4271 I2C driver: %d\n", ret);
return ret;
}
#endif
#if defined(CONFIG_SPI_MASTER)
ret = spi_register_driver(&cs4271_spi_driver);
if (ret) {
pr_err("Failed to register CS4271 SPI driver: %d\n", ret);
return ret;
}
#endif
return 0;
}
module_init(cs4271_modinit);
static void __exit cs4271_modexit(void)
{
#if defined(CONFIG_SPI_MASTER)
spi_unregister_driver(&cs4271_spi_driver);
#endif
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_del_driver(&cs4271_i2c_driver);
#endif
}
module_exit(cs4271_modexit);
MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
MODULE_DESCRIPTION("Cirrus Logic CS4271 ALSA SoC Codec Driver");
MODULE_LICENSE("GPL");
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