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linux-stable/sound/soc/codecs/cs4271.c
Lars-Peter Clausen 85e7652d89 ASoC: Constify snd_soc_dai_ops structs 
Commit 1ee46ebd("ASoC: Make the DAI ops constant in the DAI structure")
introduced the possibility to have constant DAI ops structures, yet this is
barley used in both existing drivers and also new drivers being submitted,
although none of them modifies its DAI ops structure. The later is not
surprising since existing drivers are often used as templates for new drivers.
So this patch just constifies all existing snd_soc_dai_ops structs to eliminate
the issue altogether.

The patch was generated with the following coccinelle semantic patch:
// <smpl>
@@
identifier ops;
@@
-struct snd_soc_dai_ops ops =
+const struct snd_soc_dai_ops ops =
{ ... };
// </smpl>

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-11-23 10:40:46 +00:00

664 lines
18 KiB
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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)
#define CS4271_PCM_RATES SNDRV_PCM_RATE_8000_192000
/*
* 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;
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;
};
/*
* @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);
}
struct cs4271_clk_cfg {
bool master; /* codec mode */
u8 speed_mode; /* codec speed mode: 1x, 2x, 4x */
unsigned short ratio; /* MCLK / sample rate */
u8 ratio_mask; /* ratio bit mask for Master mode */
};
static struct cs4271_clk_cfg cs4271_clk_tab[] = {
{1, CS4271_MODE1_MODE_1X, 256, CS4271_MODE1_DIV_1},
{1, CS4271_MODE1_MODE_1X, 384, CS4271_MODE1_DIV_15},
{1, CS4271_MODE1_MODE_1X, 512, CS4271_MODE1_DIV_2},
{1, CS4271_MODE1_MODE_1X, 768, CS4271_MODE1_DIV_3},
{1, CS4271_MODE1_MODE_2X, 128, CS4271_MODE1_DIV_1},
{1, CS4271_MODE1_MODE_2X, 192, CS4271_MODE1_DIV_15},
{1, CS4271_MODE1_MODE_2X, 256, CS4271_MODE1_DIV_2},
{1, CS4271_MODE1_MODE_2X, 384, CS4271_MODE1_DIV_3},
{1, CS4271_MODE1_MODE_4X, 64, CS4271_MODE1_DIV_1},
{1, CS4271_MODE1_MODE_4X, 96, CS4271_MODE1_DIV_15},
{1, CS4271_MODE1_MODE_4X, 128, CS4271_MODE1_DIV_2},
{1, CS4271_MODE1_MODE_4X, 192, CS4271_MODE1_DIV_3},
{0, CS4271_MODE1_MODE_1X, 256, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_1X, 384, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_1X, 512, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_1X, 768, CS4271_MODE1_DIV_2},
{0, CS4271_MODE1_MODE_1X, 1024, CS4271_MODE1_DIV_2},
{0, CS4271_MODE1_MODE_2X, 128, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_2X, 192, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_2X, 256, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_2X, 384, CS4271_MODE1_DIV_2},
{0, CS4271_MODE1_MODE_2X, 512, CS4271_MODE1_DIV_2},
{0, CS4271_MODE1_MODE_4X, 64, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_4X, 96, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_4X, 128, CS4271_MODE1_DIV_1},
{0, CS4271_MODE1_MODE_4X, 192, CS4271_MODE1_DIV_2},
{0, CS4271_MODE1_MODE_4X, 256, CS4271_MODE1_DIV_2},
};
#define CS4171_NR_RATIOS ARRAY_SIZE(cs4271_clk_tab)
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);
/* Configure DAC */
if (cs4271->rate < 50000)
val = CS4271_MODE1_MODE_1X;
else if (cs4271->rate < 100000)
val = CS4271_MODE1_MODE_2X;
else
val = CS4271_MODE1_MODE_4X;
ratio = cs4271->mclk / cs4271->rate;
for (i = 0; i < CS4171_NR_RATIOS; i++)
if ((cs4271_clk_tab[i].master == cs4271->master) &&
(cs4271_clk_tab[i].speed_mode == val) &&
(cs4271_clk_tab[i].ratio == ratio))
break;
if (i == CS4171_NR_RATIOS) {
dev_err(codec->dev, "Invalid sample rate\n");
return -EINVAL;
}
val |= cs4271_clk_tab[i].ratio_mask;
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 const 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 = CS4271_PCM_RATES,
.formats = CS4271_PCM_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = CS4271_PCM_RATES,
.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, CS4271_MODE2_PDN,
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;
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,
CS4271_MODE2_PDN | CS4271_MODE2_CPEN,
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->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 const 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->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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