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0db4d07052
linux/sound/soc/codecs/cs4270.c
Timur Tabi 0db4d07052 ASoC: improve I2C initialization code in CS4270 driver 
Further improvements in the I2C initialization sequence of the CS4270 driver.
All ASoC initialization is now done in the I2C probe function.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-01-23 23:00:39 +00:00

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/*
* CS4270 ALSA SoC (ASoC) codec driver
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2007 Freescale Semiconductor, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* This is an ASoC device driver for the Cirrus Logic CS4270 codec.
*
* Current features/limitations:
*
* 1) Software mode is supported. Stand-alone mode is not supported.
* 2) Only I2C is supported, not SPI
* 3) Only Master mode is supported, not Slave.
* 4) The machine driver's 'startup' function must call
* cs4270_set_dai_sysclk() with the value of MCLK.
* 5) Only I2S and left-justified modes are supported
* 6) Power management is not supported
* 7) The only supported control is volume and hardware mute (if enabled)
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <linux/i2c.h>
#include "cs4270.h"
/*
* The codec isn't really big-endian or little-endian, since the I2S
* interface requires data to be sent serially with the MSbit first.
* However, to support BE and LE I2S devices, we specify both here. That
* way, ALSA will always match the bit patterns.
*/
#define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \
SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \
SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
/* CS4270 registers addresses */
#define CS4270_CHIPID 0x01 /* Chip ID */
#define CS4270_PWRCTL 0x02 /* Power Control */
#define CS4270_MODE 0x03 /* Mode Control */
#define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */
#define CS4270_TRANS 0x05 /* Transition Control */
#define CS4270_MUTE 0x06 /* Mute Control */
#define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */
#define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */
#define CS4270_FIRSTREG 0x01
#define CS4270_LASTREG 0x08
#define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1)
/* Bit masks for the CS4270 registers */
#define CS4270_CHIPID_ID 0xF0
#define CS4270_CHIPID_REV 0x0F
#define CS4270_PWRCTL_FREEZE 0x80
#define CS4270_PWRCTL_PDN_ADC 0x20
#define CS4270_PWRCTL_PDN_DAC 0x02
#define CS4270_PWRCTL_PDN 0x01
#define CS4270_MODE_SPEED_MASK 0x30
#define CS4270_MODE_1X 0x00
#define CS4270_MODE_2X 0x10
#define CS4270_MODE_4X 0x20
#define CS4270_MODE_SLAVE 0x30
#define CS4270_MODE_DIV_MASK 0x0E
#define CS4270_MODE_DIV1 0x00
#define CS4270_MODE_DIV15 0x02
#define CS4270_MODE_DIV2 0x04
#define CS4270_MODE_DIV3 0x06
#define CS4270_MODE_DIV4 0x08
#define CS4270_MODE_POPGUARD 0x01
#define CS4270_FORMAT_FREEZE_A 0x80
#define CS4270_FORMAT_FREEZE_B 0x40
#define CS4270_FORMAT_LOOPBACK 0x20
#define CS4270_FORMAT_DAC_MASK 0x18
#define CS4270_FORMAT_DAC_LJ 0x00
#define CS4270_FORMAT_DAC_I2S 0x08
#define CS4270_FORMAT_DAC_RJ16 0x18
#define CS4270_FORMAT_DAC_RJ24 0x10
#define CS4270_FORMAT_ADC_MASK 0x01
#define CS4270_FORMAT_ADC_LJ 0x00
#define CS4270_FORMAT_ADC_I2S 0x01
#define CS4270_TRANS_ONE_VOL 0x80
#define CS4270_TRANS_SOFT 0x40
#define CS4270_TRANS_ZERO 0x20
#define CS4270_TRANS_INV_ADC_A 0x08
#define CS4270_TRANS_INV_ADC_B 0x10
#define CS4270_TRANS_INV_DAC_A 0x02
#define CS4270_TRANS_INV_DAC_B 0x04
#define CS4270_TRANS_DEEMPH 0x01
#define CS4270_MUTE_AUTO 0x20
#define CS4270_MUTE_ADC_A 0x08
#define CS4270_MUTE_ADC_B 0x10
#define CS4270_MUTE_POLARITY 0x04
#define CS4270_MUTE_DAC_A 0x01
#define CS4270_MUTE_DAC_B 0x02
/* Private data for the CS4270 */
struct cs4270_private {
struct snd_soc_codec codec;
u8 reg_cache[CS4270_NUMREGS];
unsigned int mclk; /* Input frequency of the MCLK pin */
unsigned int mode; /* The mode (I2S or left-justified) */
};
/*
* Clock Ratio Selection for Master Mode with I2C enabled
*
* The data for this chart is taken from Table 5 of the CS4270 reference
* manual.
*
* This table is used to determine how to program the Mode Control register.
* It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling
* rates the CS4270 currently supports.
*
* Each element in this array corresponds to the ratios in mclk_ratios[].
* These two arrays need to be in sync.
*
* 'speed_mode' is the corresponding bit pattern to be written to the
* MODE bits of the Mode Control Register
*
* 'mclk' is the corresponding bit pattern to be wirten to the MCLK bits of
* the Mode Control Register.
*
* In situations where a single ratio is represented by multiple speed
* modes, we favor the slowest speed. E.g, for a ratio of 128, we pick
* double-speed instead of quad-speed. However, the CS4270 errata states
* that Divide-By-1.5 can cause failures, so we avoid that mode where
* possible.
*
* ERRATA: There is an errata for the CS4270 where divide-by-1.5 does not
* work if VD = 3.3V. If this effects you, select the
* CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will
* never select any sample rates that require divide-by-1.5.
*/
static struct {
unsigned int ratio;
u8 speed_mode;
u8 mclk;
} cs4270_mode_ratios[] = {
{64, CS4270_MODE_4X, CS4270_MODE_DIV1},
#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA
{96, CS4270_MODE_4X, CS4270_MODE_DIV15},
#endif
{128, CS4270_MODE_2X, CS4270_MODE_DIV1},
{192, CS4270_MODE_4X, CS4270_MODE_DIV3},
{256, CS4270_MODE_1X, CS4270_MODE_DIV1},
{384, CS4270_MODE_2X, CS4270_MODE_DIV3},
{512, CS4270_MODE_1X, CS4270_MODE_DIV2},
{768, CS4270_MODE_1X, CS4270_MODE_DIV3},
{1024, CS4270_MODE_1X, CS4270_MODE_DIV4}
};
/* The number of MCLK/LRCK ratios supported by the CS4270 */
#define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios)
/*
* Determine the CS4270 samples rates.
*
* 'freq' is the input frequency to MCLK. The other parameters are ignored.
*
* The value of MCLK is used to determine which sample rates are supported
* by the CS4270. The ratio of MCLK / Fs must be equal to one of nine
* support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024.
*
* This function calculates the nine ratios and determines which ones match
* a standard sample rate. If there's a match, then it is added to the list
* of support sample rates.
*
* This function must be called by the machine driver's 'startup' function,
* otherwise the list of supported sample rates will not be available in
* time for ALSA.
*
* Note that in stand-alone mode, the sample rate is determined by input
* pins M0, M1, MDIV1, and MDIV2. Also in stand-alone mode, divide-by-3
* is not a programmable option. However, divide-by-3 is not an available
* option in stand-alone mode. This cases two problems: a ratio of 768 is
* not available (it requires divide-by-3) and B) ratios 192 and 384 can
* only be selected with divide-by-1.5, but there is an errate that make
* this selection difficult.
*
* In addition, there is no mechanism for communicating with the machine
* driver what the input settings can be. This would need to be implemented
* for stand-alone mode to work.
*/
static int cs4270_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 cs4270_private *cs4270 = codec->private_data;
unsigned int rates = 0;
unsigned int rate_min = -1;
unsigned int rate_max = 0;
unsigned int i;
cs4270->mclk = freq;
for (i = 0; i < NUM_MCLK_RATIOS; i++) {
unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
rates |= snd_pcm_rate_to_rate_bit(rate);
if (rate < rate_min)
rate_min = rate;
if (rate > rate_max)
rate_max = rate;
}
/* FIXME: soc should support a rate list */
rates &= ~SNDRV_PCM_RATE_KNOT;
if (!rates) {
printk(KERN_ERR "cs4270: could not find a valid sample rate\n");
return -EINVAL;
}
codec_dai->playback.rates = rates;
codec_dai->playback.rate_min = rate_min;
codec_dai->playback.rate_max = rate_max;
codec_dai->capture.rates = rates;
codec_dai->capture.rate_min = rate_min;
codec_dai->capture.rate_max = rate_max;
return 0;
}
/*
* Configure the codec for the selected audio format
*
* This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the
* codec accordingly.
*
* Currently, this function only supports SND_SOC_DAIFMT_I2S and
* SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified
* data for playback only, but ASoC currently does not support different
* formats for playback vs. record.
*/
static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct cs4270_private *cs4270 = codec->private_data;
int ret = 0;
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
case SND_SOC_DAIFMT_LEFT_J:
cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
break;
default:
printk(KERN_ERR "cs4270: invalid DAI format\n");
ret = -EINVAL;
}
return ret;
}
/*
* Pre-fill the CS4270 register cache.
*
* We use the auto-increment feature of the CS4270 to read all registers in
* one shot.
*/
static int cs4270_fill_cache(struct snd_soc_codec *codec)
{
u8 *cache = codec->reg_cache;
struct i2c_client *i2c_client = codec->control_data;
s32 length;
length = i2c_smbus_read_i2c_block_data(i2c_client,
CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache);
if (length != CS4270_NUMREGS) {
printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n",
i2c_client->addr);
return -EIO;
}
return 0;
}
/*
* Read from the CS4270 register cache.
*
* This CS4270 registers are cached to avoid excessive I2C I/O operations.
* After the initial read to pre-fill the cache, the CS4270 never updates
* the register values, so we won't have a cache coherncy problem.
*/
static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec,
unsigned int reg)
{
u8 *cache = codec->reg_cache;
if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
return -EIO;
return cache[reg - CS4270_FIRSTREG];
}
/*
* Write to a CS4270 register via the I2C bus.
*
* This function writes the given value to the given CS4270 register, and
* also updates the register cache.
*
* Note that we don't use the hw_write function pointer of snd_soc_codec.
* That's because it's too clunky: the hw_write_t prototype does not match
* i2c_smbus_write_byte_data(), and it's just another layer of overhead.
*/
static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 *cache = codec->reg_cache;
if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
return -EIO;
/* Only perform an I2C operation if the new value is different */
if (cache[reg - CS4270_FIRSTREG] != value) {
struct i2c_client *client = codec->control_data;
if (i2c_smbus_write_byte_data(client, reg, value)) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return -EIO;
}
/* We've written to the hardware, so update the cache */
cache[reg - CS4270_FIRSTREG] = value;
}
return 0;
}
/*
* Program the CS4270 with the given hardware parameters.
*
* The .ops functions are used to provide board-specific data, like
* input frequencies, to this driver. This function takes that information,
* combines it with the hardware parameters provided, and programs the
* hardware accordingly.
*/
static int cs4270_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_device *socdev = rtd->socdev;
struct snd_soc_codec *codec = socdev->codec;
struct cs4270_private *cs4270 = codec->private_data;
int ret;
unsigned int i;
unsigned int rate;
unsigned int ratio;
int reg;
/* Figure out which MCLK/LRCK ratio to use */
rate = params_rate(params); /* Sampling rate, in Hz */
ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */
for (i = 0; i < NUM_MCLK_RATIOS; i++) {
if (cs4270_mode_ratios[i].ratio == ratio)
break;
}
if (i == NUM_MCLK_RATIOS) {
/* We did not find a matching ratio */
printk(KERN_ERR "cs4270: could not find matching ratio\n");
return -EINVAL;
}
/* Freeze and power-down the codec */
ret = snd_soc_write(codec, CS4270_PWRCTL, CS4270_PWRCTL_FREEZE |
CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC |
CS4270_PWRCTL_PDN);
if (ret < 0) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return ret;
}
/* Program the mode control register */
reg = snd_soc_read(codec, CS4270_MODE);
reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK);
reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk;
ret = snd_soc_write(codec, CS4270_MODE, reg);
if (ret < 0) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return ret;
}
/* Program the format register */
reg = snd_soc_read(codec, CS4270_FORMAT);
reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK);
switch (cs4270->mode) {
case SND_SOC_DAIFMT_I2S:
reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S;
break;
case SND_SOC_DAIFMT_LEFT_J:
reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ;
break;
default:
printk(KERN_ERR "cs4270: unknown format\n");
return -EINVAL;
}
ret = snd_soc_write(codec, CS4270_FORMAT, reg);
if (ret < 0) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return ret;
}
/* Disable auto-mute. This feature appears to be buggy, because in
some situations, auto-mute will not deactivate when it should. */
reg = snd_soc_read(codec, CS4270_MUTE);
reg &= ~CS4270_MUTE_AUTO;
ret = snd_soc_write(codec, CS4270_MUTE, reg);
if (ret < 0) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return ret;
}
/* Disable automatic volume control. It's enabled by default, and
* it causes volume change commands to be delayed, sometimes until
* after playback has started.
*/
reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
if (ret < 0) {
printk(KERN_ERR "I2C write failed\n");
return ret;
}
/* Thaw and power-up the codec */
ret = snd_soc_write(codec, CS4270_PWRCTL, 0);
if (ret < 0) {
printk(KERN_ERR "cs4270: I2C write failed\n");
return ret;
}
return ret;
}
#ifdef CONFIG_SND_SOC_CS4270_HWMUTE
/*
* Set the CS4270 external mute
*
* This function toggles the mute bits in the MUTE register. The CS4270's
* mute capability is intended for external muting circuitry, so if the
* board does not have the MUTEA or MUTEB pins connected to such circuitry,
* then this function will do nothing.
*/
static int cs4270_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
int reg6;
reg6 = snd_soc_read(codec, CS4270_MUTE);
if (mute)
reg6 |= CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B |
CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B;
else
reg6 &= ~(CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B |
CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B);
return snd_soc_write(codec, CS4270_MUTE, reg6);
}
#else
#define cs4270_mute NULL
#endif
/* A list of non-DAPM controls that the CS4270 supports */
static const struct snd_kcontrol_new cs4270_snd_controls[] = {
SOC_DOUBLE_R("Master Playback Volume",
CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1)
};
/*
* Global variable to store socdev for i2c probe function.
*
* If struct i2c_driver had a private_data field, we wouldn't need to use
* cs4270_socdec. This is the only way to pass the socdev structure to
* cs4270_i2c_probe().
*
* The real solution to cs4270_socdev is to create a mechanism
* that maps I2C addresses to snd_soc_device structures. Perhaps the
* creation of the snd_soc_device object should be moved out of
* cs4270_probe() and into cs4270_i2c_probe(), but that would make this
* driver dependent on I2C. The CS4270 supports "stand-alone" mode, whereby
* the chip is *not* connected to the I2C bus, but is instead configured via
* input pins.
*/
static struct snd_soc_device *cs4270_socdev;
struct snd_soc_dai cs4270_dai = {
.name = "cs4270",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.rates = 0,
.formats = CS4270_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = 0,
.formats = CS4270_FORMATS,
},
.ops = {
.hw_params = cs4270_hw_params,
.set_sysclk = cs4270_set_dai_sysclk,
.set_fmt = cs4270_set_dai_fmt,
.digital_mute = cs4270_mute,
},
};
EXPORT_SYMBOL_GPL(cs4270_dai);
/*
* Initialize the I2C interface of the CS4270
*
* This function is called for whenever the I2C subsystem finds a device
* at a particular address.
*
* Note: snd_soc_new_pcms() must be called before this function can be called,
* because of snd_ctl_add().
*/
static int cs4270_i2c_probe(struct i2c_client *i2c_client,
const struct i2c_device_id *id)
{
struct snd_soc_device *socdev = cs4270_socdev;
struct snd_soc_codec *codec;
struct cs4270_private *cs4270;
int i;
int ret = 0;
/* Verify that we have a CS4270 */
ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
if (ret < 0) {
printk(KERN_ERR "cs4270: failed to read I2C\n");
return ret;
}
/* The top four bits of the chip ID should be 1100. */
if ((ret & 0xF0) != 0xC0) {
printk(KERN_ERR "cs4270: device at addr %X is not a CS4270\n",
i2c_client->addr);
return -ENODEV;
}
printk(KERN_INFO "cs4270: found device at I2C address %X\n",
i2c_client->addr);
printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF);
/* Allocate enough space for the snd_soc_codec structure
and our private data together. */
cs4270 = kzalloc(sizeof(struct cs4270_private), GFP_KERNEL);
if (!cs4270) {
printk(KERN_ERR "cs4270: Could not allocate codec structure\n");
return -ENOMEM;
}
codec = &cs4270->codec;
socdev->codec = codec;
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->name = "CS4270";
codec->owner = THIS_MODULE;
codec->dai = &cs4270_dai;
codec->num_dai = 1;
codec->private_data = cs4270;
codec->control_data = i2c_client;
codec->read = cs4270_read_reg_cache;
codec->write = cs4270_i2c_write;
codec->reg_cache = cs4270->reg_cache;
codec->reg_cache_size = CS4270_NUMREGS;
/* The I2C interface is set up, so pre-fill our register cache */
ret = cs4270_fill_cache(codec);
if (ret < 0) {
printk(KERN_ERR "cs4270: failed to fill register cache\n");
goto error_free_codec;
}
/* Register PCMs */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
printk(KERN_ERR "cs4270: failed to create PCMs\n");
goto error_free_codec;
}
/* Add the non-DAPM controls */
for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) {
struct snd_kcontrol *kctrl;
kctrl = snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL);
if (!kctrl) {
printk(KERN_ERR "cs4270: error creating control '%s'\n",
cs4270_snd_controls[i].name);
ret = -ENOMEM;
goto error_free_pcms;
}
ret = snd_ctl_add(codec->card, kctrl);
if (ret < 0) {
printk(KERN_ERR "cs4270: error adding control '%s'\n",
cs4270_snd_controls[i].name);
goto error_free_pcms;
}
}
/* Initialize the SOC device */
ret = snd_soc_init_card(socdev);
if (ret < 0) {
printk(KERN_ERR "cs4270: failed to register card\n");
goto error_free_pcms;;
}
i2c_set_clientdata(i2c_client, socdev);
return 0;
error_free_pcms:
snd_soc_free_pcms(socdev);
error_free_codec:
kfree(cs4270);
return ret;
}
static int cs4270_i2c_remove(struct i2c_client *i2c_client)
{
struct snd_soc_device *socdev = i2c_get_clientdata(i2c_client);
struct snd_soc_codec *codec = socdev->codec;
struct cs4270_private *cs4270 = codec->private_data;
snd_soc_free_pcms(socdev);
kfree(cs4270);
return 0;
}
static struct i2c_device_id cs4270_id[] = {
{"cs4270", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, cs4270_id);
static struct i2c_driver cs4270_i2c_driver = {
.driver = {
.name = "cs4270",
.owner = THIS_MODULE,
},
.id_table = cs4270_id,
.probe = cs4270_i2c_probe,
.remove = cs4270_i2c_remove,
};
/*
* ASoC probe function
*
* This function is called when the machine driver calls
* platform_device_add().
*/
static int cs4270_probe(struct platform_device *pdev)
{
cs4270_socdev = platform_get_drvdata(pdev);;
return i2c_add_driver(&cs4270_i2c_driver);
}
static int cs4270_remove(struct platform_device *pdev)
{
i2c_del_driver(&cs4270_i2c_driver);
return 0;
}
/*
* ASoC codec device structure
*
* Assign this variable to the codec_dev field of the machine driver's
* snd_soc_device structure.
*/
struct snd_soc_codec_device soc_codec_device_cs4270 = {
.probe = cs4270_probe,
.remove = cs4270_remove
};
EXPORT_SYMBOL_GPL(soc_codec_device_cs4270);
static int __init cs4270_init(void)
{
printk(KERN_INFO "Cirrus Logic CS4270 ALSA SoC Codec Driver\n");
return snd_soc_register_dai(&cs4270_dai);
}
module_init(cs4270_init);
static void __exit cs4270_exit(void)
{
snd_soc_unregister_dai(&cs4270_dai);
}
module_exit(cs4270_exit);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver");
MODULE_LICENSE("GPL");
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