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linux/sound/soc/codecs/cs4270.c
Timur Tabi d5e9ba1d58 ASoC: add additional controls to the CS4270 codec driver 
Update the CS4270 codec driver to allow applications to use the mixer to
control Digital Loopback, Soft Ramp, Zero Cross, Popguard, and Auto-Mute.
Soft Ramp, Zero Cross, and Auto-Mute are disabled by the driver when it first
initializes the hardware, but these features either don't work or interfere
with normal ALSA behavior.  However, they can now be re-enabled by an
application if desired.

Remove CONFIG_SND_SOC_CS4270_HWMUTE and always allow ASoC to control the mute
bits.  The driver previously and erroneously assumed that these bits
control only external muting circuitry, but they also control internal
muting circuitry, so they should always be used.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-02-13 13:32:51 +00:00

793 lines
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/*
* CS4270 ALSA SoC (ASoC) codec driver
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2007-2009 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) */
};
/**
* struct cs4270_mode_ratios - clock ratio tables
* @ratio: the ratio of MCLK to the sample rate
* @speed_mode: the Speed Mode bits to set in the Mode Control register for
* this ratio
* @mclk: the Ratio Select bits to set in the Mode Control register for this
* ratio
*
* 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.
*
* @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 is 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.
*/
struct cs4270_mode_ratios {
unsigned int ratio;
u8 speed_mode;
u8 mclk;
};
static struct cs4270_mode_ratios 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)
/**
* cs4270_set_dai_sysclk - determine the CS4270 samples rates.
* @codec_dai: the codec DAI
* @clk_id: the clock ID (ignored)
* @freq: the MCLK input frequency
* @dir: the clock direction (ignored)
*
* This function is used to tell the codec driver what the input MCLK
* frequency is.
*
* 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
* supported 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 supported 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.
*/
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) {
dev_err(codec->dev, "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;
}
/**
* cs4270_set_dai_fmt - configure the codec for the selected audio format
* @codec_dai: the codec DAI
* @format: a SND_SOC_DAIFMT_x value indicating the data 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:
dev_err(codec->dev, "invalid dai format\n");
ret = -EINVAL;
}
return ret;
}
/**
* cs4270_fill_cache - pre-fill the CS4270 register cache.
* @codec: the codec for this CS4270
*
* This function fills in the CS4270 register cache by reading the register
* values from the hardware.
*
* 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 coherency problem.
*
* 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) {
dev_err(codec->dev, "i2c read failure, addr=0x%x\n",
i2c_client->addr);
return -EIO;
}
return 0;
}
/**
* cs4270_read_reg_cache - read from the CS4270 register cache.
* @codec: the codec for this CS4270
* @reg: the register to read
*
* This function returns the value for a given register. It reads only from
* the register cache, not the hardware itself.
*
* 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 coherency 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];
}
/**
* cs4270_i2c_write - write to a CS4270 register via the I2C bus.
* @codec: the codec for this CS4270
* @reg: the register to write
* @value: the value to write to the register
*
* 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)) {
dev_err(codec->dev, "i2c write failed\n");
return -EIO;
}
/* We've written to the hardware, so update the cache */
cache[reg - CS4270_FIRSTREG] = value;
}
return 0;
}
/**
* cs4270_hw_params - program the CS4270 with the given hardware parameters.
* @substream: the audio stream
* @params: the hardware parameters to set
* @dai: the SOC DAI (ignored)
*
* This function programs the hardware with the values provided.
* Specifically, the sample rate and the data format.
*
* 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->card->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 */
dev_err(codec->dev, "could not find matching ratio\n");
return -EINVAL;
}
/* Set the sample rate */
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) {
dev_err(codec->dev, "i2c write failed\n");
return ret;
}
/* Set the DAI format */
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:
dev_err(codec->dev, "unknown dai format\n");
return -EINVAL;
}
ret = snd_soc_write(codec, CS4270_FORMAT, reg);
if (ret < 0) {
dev_err(codec->dev, "i2c write failed\n");
return ret;
}
return ret;
}
/**
* cs4270_mute - enable/disable the CS4270 external mute
* @dai: the SOC DAI
* @mute: 0 = disable mute, 1 = enable 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_DAC_A | CS4270_MUTE_DAC_B;
else
reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B);
return snd_soc_write(codec, CS4270_MUTE, reg6);
}
/* 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),
SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0),
SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0),
SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0),
SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1),
SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0),
SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 0)
};
/*
* cs4270_codec - global variable to store codec for the ASoC probe function
*
* If struct i2c_driver had a private_data field, we wouldn't need to use
* cs4270_codec. This is the only way to pass the codec structure from
* cs4270_i2c_probe() to cs4270_probe(). Unfortunately, there is no good
* way to synchronize these two functions. cs4270_i2c_probe() can be called
* multiple times before cs4270_probe() is called even once. So for now, we
* also only allow cs4270_i2c_probe() to be run once. That means that we do
* not support more than one cs4270 device in the system, at least for now.
*/
static struct snd_soc_codec *cs4270_codec;
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);
/**
* cs4270_probe - ASoC probe function
* @pdev: platform device
*
* This function is called when ASoC has all the pieces it needs to
* instantiate a sound driver.
*/
static int cs4270_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = cs4270_codec;
unsigned int i;
int ret;
/* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
socdev->card->codec = codec;
/* Register PCMs */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
dev_err(codec->dev, "failed to create pcms\n");
return ret;
}
/* 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) {
dev_err(codec->dev, "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) {
dev_err(codec->dev, "error adding control '%s'\n",
cs4270_snd_controls[i].name);
goto error_free_pcms;
}
}
/* And finally, register the socdev */
ret = snd_soc_init_card(socdev);
if (ret < 0) {
dev_err(codec->dev, "failed to register card\n");
goto error_free_pcms;
}
return 0;
error_free_pcms:
snd_soc_free_pcms(socdev);
return ret;
}
/**
* cs4270_remove - ASoC remove function
* @pdev: platform device
*
* This function is the counterpart to cs4270_probe().
*/
static int cs4270_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_soc_free_pcms(socdev);
return 0;
};
/**
* cs4270_i2c_probe - initialize the I2C interface of the CS4270
* @i2c_client: the I2C client object
* @id: the I2C device ID (ignored)
*
* This function is called whenever the I2C subsystem finds a device that
* matches the device ID given via a prior call to i2c_add_driver().
*/
static int cs4270_i2c_probe(struct i2c_client *i2c_client,
const struct i2c_device_id *id)
{
struct snd_soc_codec *codec;
struct cs4270_private *cs4270;
unsigned int reg;
int ret;
/* For now, we only support one cs4270 device in the system. See the
* comment for cs4270_codec.
*/
if (cs4270_codec) {
dev_err(&i2c_client->dev, "ignoring CS4270 at addr %X\n",
i2c_client->addr);
dev_err(&i2c_client->dev, "only one per board allowed\n");
/* Should we return something other than ENODEV here? */
return -ENODEV;
}
/* Verify that we have a CS4270 */
ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
if (ret < 0) {
dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n",
i2c_client->addr);
return ret;
}
/* The top four bits of the chip ID should be 1100. */
if ((ret & 0xF0) != 0xC0) {
dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n",
i2c_client->addr);
return -ENODEV;
}
dev_info(&i2c_client->dev, "found device at i2c address %X\n",
i2c_client->addr);
dev_info(&i2c_client->dev, "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) {
dev_err(&i2c_client->dev, "could not allocate codec\n");
return -ENOMEM;
}
codec = &cs4270->codec;
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->dev = &i2c_client->dev;
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) {
dev_err(&i2c_client->dev, "failed to fill register cache\n");
goto error_free_codec;
}
/* Disable auto-mute. This feature appears to be buggy. In some
* situations, auto-mute will not deactivate when it should, so we want
* this feature disabled by default. An application (e.g. alsactl) can
* re-enabled it by using the controls.
*/
reg = cs4270_read_reg_cache(codec, CS4270_MUTE);
reg &= ~CS4270_MUTE_AUTO;
ret = cs4270_i2c_write(codec, CS4270_MUTE, reg);
if (ret < 0) {
dev_err(&i2c_client->dev, "i2c write failed\n");
return ret;
}
/* Disable automatic volume control. The hardware enables, and it
* causes volume change commands to be delayed, sometimes until after
* playback has started. An application (e.g. alsactl) can
* re-enabled it by using the controls.
*/
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) {
dev_err(&i2c_client->dev, "i2c write failed\n");
return ret;
}
/* Initialize the DAI. Normally, we'd prefer to have a kmalloc'd DAI
* structure for each CS4270 device, but the machine driver needs to
* have a pointer to the DAI structure, so for now it must be a global
* variable.
*/
cs4270_dai.dev = &i2c_client->dev;
/* Register the DAI. If all the other ASoC driver have already
* registered, then this will call our probe function, so
* cs4270_codec needs to be ready.
*/
cs4270_codec = codec;
ret = snd_soc_register_dai(&cs4270_dai);
if (ret < 0) {
dev_err(&i2c_client->dev, "failed to register DAIe\n");
goto error_free_codec;
}
i2c_set_clientdata(i2c_client, cs4270);
return 0;
error_free_codec:
kfree(cs4270);
cs4270_codec = NULL;
cs4270_dai.dev = NULL;
return ret;
}
/**
* cs4270_i2c_remove - remove an I2C device
* @i2c_client: the I2C client object
*
* This function is the counterpart to cs4270_i2c_probe().
*/
static int cs4270_i2c_remove(struct i2c_client *i2c_client)
{
struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client);
kfree(cs4270);
cs4270_codec = NULL;
cs4270_dai.dev = NULL;
return 0;
}
/*
* cs4270_id - I2C device IDs supported by this driver
*/
static struct i2c_device_id cs4270_id[] = {
{"cs4270", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, cs4270_id);
/*
* cs4270_i2c_driver - I2C device identification
*
* This structure tells the I2C subsystem how to identify and support a
* given I2C device type.
*/
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 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)
{
pr_info("Cirrus Logic CS4270 ALSA SoC Codec Driver\n");
return i2c_add_driver(&cs4270_i2c_driver);
}
module_init(cs4270_init);
static void __exit cs4270_exit(void)
{
i2c_del_driver(&cs4270_i2c_driver);
}
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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