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linux / linux / kernel / git / tj / wq / refs/heads/cpu_stop / . / sound / soc / codecs / tlv320dac33.c
blob: d1e0e81ef30c6bf0da79e8fb3a6354a0c78cf81a [file] [log] [blame]
/*
* ALSA SoC Texas Instruments TLV320DAC33 codec driver
*
* Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
*
* Copyright: (C) 2009 Nokia Corporation
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#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/interrupt.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/tlv320dac33-plat.h>
#include "tlv320dac33.h"
#define DAC33_BUFFER_SIZE_BYTES 24576 /* bytes, 12288 16 bit words,
* 6144 stereo */
#define DAC33_BUFFER_SIZE_SAMPLES 6144
#define NSAMPLE_MAX 5700
#define LATENCY_TIME_MS 20
static struct snd_soc_codec *tlv320dac33_codec;
enum dac33_state {
DAC33_IDLE = 0,
DAC33_PREFILL,
DAC33_PLAYBACK,
DAC33_FLUSH,
};
enum dac33_fifo_modes {
DAC33_FIFO_BYPASS = 0,
DAC33_FIFO_MODE1,
DAC33_FIFO_MODE7,
DAC33_FIFO_LAST_MODE,
};
#define DAC33_NUM_SUPPLIES 3
static const char *dac33_supply_names[DAC33_NUM_SUPPLIES] = {
"AVDD",
"DVDD",
"IOVDD",
};
struct tlv320dac33_priv {
struct mutex mutex;
struct workqueue_struct *dac33_wq;
struct work_struct work;
struct snd_soc_codec codec;
struct regulator_bulk_data supplies[DAC33_NUM_SUPPLIES];
int power_gpio;
int chip_power;
int irq;
unsigned int refclk;
unsigned int alarm_threshold; /* set to be half of LATENCY_TIME_MS */
unsigned int nsample_min; /* nsample should not be lower than
* this */
unsigned int nsample_max; /* nsample should not be higher than
* this */
enum dac33_fifo_modes fifo_mode;/* FIFO mode selection */
unsigned int nsample; /* burst read amount from host */
u8 burst_bclkdiv; /* BCLK divider value in burst mode */
enum dac33_state state;
};
static const u8 dac33_reg[DAC33_CACHEREGNUM] = {
0x00, 0x00, 0x00, 0x00, /* 0x00 - 0x03 */
0x00, 0x00, 0x00, 0x00, /* 0x04 - 0x07 */
0x00, 0x00, 0x00, 0x00, /* 0x08 - 0x0b */
0x00, 0x00, 0x00, 0x00, /* 0x0c - 0x0f */
0x00, 0x00, 0x00, 0x00, /* 0x10 - 0x13 */
0x00, 0x00, 0x00, 0x00, /* 0x14 - 0x17 */
0x00, 0x00, 0x00, 0x00, /* 0x18 - 0x1b */
0x00, 0x00, 0x00, 0x00, /* 0x1c - 0x1f */
0x00, 0x00, 0x00, 0x00, /* 0x20 - 0x23 */
0x00, 0x00, 0x00, 0x00, /* 0x24 - 0x27 */
0x00, 0x00, 0x00, 0x00, /* 0x28 - 0x2b */
0x00, 0x00, 0x00, 0x80, /* 0x2c - 0x2f */
0x80, 0x00, 0x00, 0x00, /* 0x30 - 0x33 */
0x00, 0x00, 0x00, 0x00, /* 0x34 - 0x37 */
0x00, 0x00, /* 0x38 - 0x39 */
/* Registers 0x3a - 0x3f are reserved */
0x00, 0x00, /* 0x3a - 0x3b */
0x00, 0x00, 0x00, 0x00, /* 0x3c - 0x3f */
0x00, 0x00, 0x00, 0x00, /* 0x40 - 0x43 */
0x00, 0x80, /* 0x44 - 0x45 */
/* Registers 0x46 - 0x47 are reserved */
0x80, 0x80, /* 0x46 - 0x47 */
0x80, 0x00, 0x00, /* 0x48 - 0x4a */
/* Registers 0x4b - 0x7c are reserved */
0x00, /* 0x4b */
0x00, 0x00, 0x00, 0x00, /* 0x4c - 0x4f */
0x00, 0x00, 0x00, 0x00, /* 0x50 - 0x53 */
0x00, 0x00, 0x00, 0x00, /* 0x54 - 0x57 */
0x00, 0x00, 0x00, 0x00, /* 0x58 - 0x5b */
0x00, 0x00, 0x00, 0x00, /* 0x5c - 0x5f */
0x00, 0x00, 0x00, 0x00, /* 0x60 - 0x63 */
0x00, 0x00, 0x00, 0x00, /* 0x64 - 0x67 */
0x00, 0x00, 0x00, 0x00, /* 0x68 - 0x6b */
0x00, 0x00, 0x00, 0x00, /* 0x6c - 0x6f */
0x00, 0x00, 0x00, 0x00, /* 0x70 - 0x73 */
0x00, 0x00, 0x00, 0x00, /* 0x74 - 0x77 */
0x00, 0x00, 0x00, 0x00, /* 0x78 - 0x7b */
0x00, /* 0x7c */
0xda, 0x33, 0x03, /* 0x7d - 0x7f */
};
/* Register read and write */
static inline unsigned int dac33_read_reg_cache(struct snd_soc_codec *codec,
unsigned reg)
{
u8 *cache = codec->reg_cache;
if (reg >= DAC33_CACHEREGNUM)
return 0;
return cache[reg];
}
static inline void dac33_write_reg_cache(struct snd_soc_codec *codec,
u8 reg, u8 value)
{
u8 *cache = codec->reg_cache;
if (reg >= DAC33_CACHEREGNUM)
return;
cache[reg] = value;
}
static int dac33_read(struct snd_soc_codec *codec, unsigned int reg,
u8 *value)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
int val;
*value = reg & 0xff;
/* If powered off, return the cached value */
if (dac33->chip_power) {
val = i2c_smbus_read_byte_data(codec->control_data, value[0]);
if (val < 0) {
dev_err(codec->dev, "Read failed (%d)\n", val);
value[0] = dac33_read_reg_cache(codec, reg);
} else {
value[0] = val;
dac33_write_reg_cache(codec, reg, val);
}
} else {
value[0] = dac33_read_reg_cache(codec, reg);
}
return 0;
}
static int dac33_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
u8 data[2];
int ret = 0;
/*
* data is
* D15..D8 dac33 register offset
* D7...D0 register data
*/
data[0] = reg & 0xff;
data[1] = value & 0xff;
dac33_write_reg_cache(codec, data[0], data[1]);
if (dac33->chip_power) {
ret = codec->hw_write(codec->control_data, data, 2);
if (ret != 2)
dev_err(codec->dev, "Write failed (%d)\n", ret);
else
ret = 0;
}
return ret;
}
static int dac33_write_locked(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
int ret;
mutex_lock(&dac33->mutex);
ret = dac33_write(codec, reg, value);
mutex_unlock(&dac33->mutex);
return ret;
}
#define DAC33_I2C_ADDR_AUTOINC 0x80
static int dac33_write16(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
u8 data[3];
int ret = 0;
/*
* data is
* D23..D16 dac33 register offset
* D15..D8 register data MSB
* D7...D0 register data LSB
*/
data[0] = reg & 0xff;
data[1] = (value >> 8) & 0xff;
data[2] = value & 0xff;
dac33_write_reg_cache(codec, data[0], data[1]);
dac33_write_reg_cache(codec, data[0] + 1, data[2]);
if (dac33->chip_power) {
/* We need to set autoincrement mode for 16 bit writes */
data[0] |= DAC33_I2C_ADDR_AUTOINC;
ret = codec->hw_write(codec->control_data, data, 3);
if (ret != 3)
dev_err(codec->dev, "Write failed (%d)\n", ret);
else
ret = 0;
}
return ret;
}
static void dac33_restore_regs(struct snd_soc_codec *codec)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
u8 *cache = codec->reg_cache;
u8 data[2];
int i, ret;
if (!dac33->chip_power)
return;
for (i = DAC33_PWR_CTRL; i <= DAC33_INTP_CTRL_B; i++) {
data[0] = i;
data[1] = cache[i];
/* Skip the read only registers */
if ((i >= DAC33_INT_OSC_STATUS &&
i <= DAC33_INT_OSC_FREQ_RAT_READ_B) ||
(i >= DAC33_FIFO_WPTR_MSB && i <= DAC33_FIFO_IRQ_FLAG) ||
i == DAC33_DAC_STATUS_FLAGS ||
i == DAC33_SRC_EST_REF_CLK_RATIO_A ||
i == DAC33_SRC_EST_REF_CLK_RATIO_B)
continue;
ret = codec->hw_write(codec->control_data, data, 2);
if (ret != 2)
dev_err(codec->dev, "Write failed (%d)\n", ret);
}
for (i = DAC33_LDAC_PWR_CTRL; i <= DAC33_LINEL_TO_LLO_VOL; i++) {
data[0] = i;
data[1] = cache[i];
ret = codec->hw_write(codec->control_data, data, 2);
if (ret != 2)
dev_err(codec->dev, "Write failed (%d)\n", ret);
}
for (i = DAC33_LINER_TO_RLO_VOL; i <= DAC33_OSC_TRIM; i++) {
data[0] = i;
data[1] = cache[i];
ret = codec->hw_write(codec->control_data, data, 2);
if (ret != 2)
dev_err(codec->dev, "Write failed (%d)\n", ret);
}
}
static inline void dac33_soft_power(struct snd_soc_codec *codec, int power)
{
u8 reg;
reg = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
if (power)
reg |= DAC33_PDNALLB;
else
reg &= ~DAC33_PDNALLB;
dac33_write(codec, DAC33_PWR_CTRL, reg);
}
static int dac33_hard_power(struct snd_soc_codec *codec, int power)
{
struct tlv320dac33_priv *dac33 = codec->private_data;
int ret;
mutex_lock(&dac33->mutex);
if (power) {
ret = regulator_bulk_enable(ARRAY_SIZE(dac33->supplies),
dac33->supplies);
if (ret != 0) {
dev_err(codec->dev,
"Failed to enable supplies: %d\n", ret);
goto exit;
}
if (dac33->power_gpio >= 0)
gpio_set_value(dac33->power_gpio, 1);
dac33->chip_power = 1;
/* Restore registers */
dac33_restore_regs(codec);
dac33_soft_power(codec, 1);
} else {
dac33_soft_power(codec, 0);
if (dac33->power_gpio >= 0)
gpio_set_value(dac33->power_gpio, 0);
ret = regulator_bulk_disable(ARRAY_SIZE(dac33->supplies),
dac33->supplies);
if (ret != 0) {
dev_err(codec->dev,
"Failed to disable supplies: %d\n", ret);
goto exit;
}
dac33->chip_power = 0;
}
exit:
mutex_unlock(&dac33->mutex);
return ret;
}
static int dac33_get_nsample(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct tlv320dac33_priv *dac33 = codec->private_data;
ucontrol->value.integer.value[0] = dac33->nsample;
return 0;
}
static int dac33_set_nsample(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct tlv320dac33_priv *dac33 = codec->private_data;
int ret = 0;
if (dac33->nsample == ucontrol->value.integer.value[0])
return 0;
if (ucontrol->value.integer.value[0] < dac33->nsample_min ||
ucontrol->value.integer.value[0] > dac33->nsample_max)
ret = -EINVAL;
else
dac33->nsample = ucontrol->value.integer.value[0];
return ret;
}
static int dac33_get_fifo_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct tlv320dac33_priv *dac33 = codec->private_data;
ucontrol->value.integer.value[0] = dac33->fifo_mode;
return 0;
}
static int dac33_set_fifo_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct tlv320dac33_priv *dac33 = codec->private_data;
int ret = 0;
if (dac33->fifo_mode == ucontrol->value.integer.value[0])
return 0;
/* Do not allow changes while stream is running*/
if (codec->active)
return -EPERM;
if (ucontrol->value.integer.value[0] < 0 ||
ucontrol->value.integer.value[0] >= DAC33_FIFO_LAST_MODE)
ret = -EINVAL;
else
dac33->fifo_mode = ucontrol->value.integer.value[0];
return ret;
}
/* Codec operation modes */
static const char *dac33_fifo_mode_texts[] = {
"Bypass", "Mode 1", "Mode 7"
};
static const struct soc_enum dac33_fifo_mode_enum =
SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(dac33_fifo_mode_texts),
dac33_fifo_mode_texts);
/*
* DACL/R digital volume control:
* from 0 dB to -63.5 in 0.5 dB steps
* Need to be inverted later on:
* 0x00 == 0 dB
* 0x7f == -63.5 dB
*/
static DECLARE_TLV_DB_SCALE(dac_digivol_tlv, -6350, 50, 0);
static const struct snd_kcontrol_new dac33_snd_controls[] = {
SOC_DOUBLE_R_TLV("DAC Digital Playback Volume",
DAC33_LDAC_DIG_VOL_CTRL, DAC33_RDAC_DIG_VOL_CTRL,
0, 0x7f, 1, dac_digivol_tlv),
SOC_DOUBLE_R("DAC Digital Playback Switch",
DAC33_LDAC_DIG_VOL_CTRL, DAC33_RDAC_DIG_VOL_CTRL, 7, 1, 1),
SOC_DOUBLE_R("Line to Line Out Volume",
DAC33_LINEL_TO_LLO_VOL, DAC33_LINER_TO_RLO_VOL, 0, 127, 1),
};
static const struct snd_kcontrol_new dac33_nsample_snd_controls[] = {
SOC_SINGLE_EXT("nSample", 0, 0, 5900, 0,
dac33_get_nsample, dac33_set_nsample),
SOC_ENUM_EXT("FIFO Mode", dac33_fifo_mode_enum,
dac33_get_fifo_mode, dac33_set_fifo_mode),
};
/* Analog bypass */
static const struct snd_kcontrol_new dac33_dapm_abypassl_control =
SOC_DAPM_SINGLE("Switch", DAC33_LINEL_TO_LLO_VOL, 7, 1, 1);
static const struct snd_kcontrol_new dac33_dapm_abypassr_control =
SOC_DAPM_SINGLE("Switch", DAC33_LINER_TO_RLO_VOL, 7, 1, 1);
static const struct snd_soc_dapm_widget dac33_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("LEFT_LO"),
SND_SOC_DAPM_OUTPUT("RIGHT_LO"),
SND_SOC_DAPM_INPUT("LINEL"),
SND_SOC_DAPM_INPUT("LINER"),
SND_SOC_DAPM_DAC("DACL", "Left Playback", DAC33_LDAC_PWR_CTRL, 2, 0),
SND_SOC_DAPM_DAC("DACR", "Right Playback", DAC33_RDAC_PWR_CTRL, 2, 0),
/* Analog bypass */
SND_SOC_DAPM_SWITCH("Analog Left Bypass", SND_SOC_NOPM, 0, 0,
&dac33_dapm_abypassl_control),
SND_SOC_DAPM_SWITCH("Analog Right Bypass", SND_SOC_NOPM, 0, 0,
&dac33_dapm_abypassr_control),
SND_SOC_DAPM_REG(snd_soc_dapm_mixer, "Output Left Amp Power",
DAC33_OUT_AMP_PWR_CTRL, 6, 3, 3, 0),
SND_SOC_DAPM_REG(snd_soc_dapm_mixer, "Output Right Amp Power",
DAC33_OUT_AMP_PWR_CTRL, 4, 3, 3, 0),
};
static const struct snd_soc_dapm_route audio_map[] = {
/* Analog bypass */
{"Analog Left Bypass", "Switch", "LINEL"},
{"Analog Right Bypass", "Switch", "LINER"},
{"Output Left Amp Power", NULL, "DACL"},
{"Output Right Amp Power", NULL, "DACR"},
{"Output Left Amp Power", NULL, "Analog Left Bypass"},
{"Output Right Amp Power", NULL, "Analog Right Bypass"},
/* output */
{"LEFT_LO", NULL, "Output Left Amp Power"},
{"RIGHT_LO", NULL, "Output Right Amp Power"},
};
static int dac33_add_widgets(struct snd_soc_codec *codec)
{
snd_soc_dapm_new_controls(codec, dac33_dapm_widgets,
ARRAY_SIZE(dac33_dapm_widgets));
/* set up audio path interconnects */
snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
return 0;
}
static int dac33_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
int ret;
switch (level) {
case SND_SOC_BIAS_ON:
dac33_soft_power(codec, 1);
break;
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (codec->bias_level == SND_SOC_BIAS_OFF) {
ret = dac33_hard_power(codec, 1);
if (ret != 0)
return ret;
}
dac33_soft_power(codec, 0);
break;
case SND_SOC_BIAS_OFF:
ret = dac33_hard_power(codec, 0);
if (ret != 0)
return ret;
break;
}
codec->bias_level = level;
return 0;
}
static inline void dac33_prefill_handler(struct tlv320dac33_priv *dac33)
{
struct snd_soc_codec *codec;
codec = &dac33->codec;
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
dac33_write16(codec, DAC33_NSAMPLE_MSB,
DAC33_THRREG(dac33->nsample));
dac33_write16(codec, DAC33_PREFILL_MSB,
DAC33_THRREG(dac33->alarm_threshold));
break;
case DAC33_FIFO_MODE7:
dac33_write16(codec, DAC33_PREFILL_MSB,
DAC33_THRREG(10));
break;
default:
dev_warn(codec->dev, "Unhandled FIFO mode: %d\n",
dac33->fifo_mode);
break;
}
}
static inline void dac33_playback_handler(struct tlv320dac33_priv *dac33)
{
struct snd_soc_codec *codec;
codec = &dac33->codec;
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
dac33_write16(codec, DAC33_NSAMPLE_MSB,
DAC33_THRREG(dac33->nsample));
break;
case DAC33_FIFO_MODE7:
/* At the moment we are not using interrupts in mode7 */
break;
default:
dev_warn(codec->dev, "Unhandled FIFO mode: %d\n",
dac33->fifo_mode);
break;
}
}
static void dac33_work(struct work_struct *work)
{
struct snd_soc_codec *codec;
struct tlv320dac33_priv *dac33;
u8 reg;
dac33 = container_of(work, struct tlv320dac33_priv, work);
codec = &dac33->codec;
mutex_lock(&dac33->mutex);
switch (dac33->state) {
case DAC33_PREFILL:
dac33->state = DAC33_PLAYBACK;
dac33_prefill_handler(dac33);
break;
case DAC33_PLAYBACK:
dac33_playback_handler(dac33);
break;
case DAC33_IDLE:
break;
case DAC33_FLUSH:
dac33->state = DAC33_IDLE;
/* Mask all interrupts from dac33 */
dac33_write(codec, DAC33_FIFO_IRQ_MASK, 0);
/* flush fifo */
reg = dac33_read_reg_cache(codec, DAC33_FIFO_CTRL_A);
reg |= DAC33_FIFOFLUSH;
dac33_write(codec, DAC33_FIFO_CTRL_A, reg);
break;
}
mutex_unlock(&dac33->mutex);
}
static irqreturn_t dac33_interrupt_handler(int irq, void *dev)
{
struct snd_soc_codec *codec = dev;
struct tlv320dac33_priv *dac33 = codec->private_data;
queue_work(dac33->dac33_wq, &dac33->work);
return IRQ_HANDLED;
}
static void dac33_shutdown(struct snd_pcm_substream *substream,
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 tlv320dac33_priv *dac33 = codec->private_data;
unsigned int pwr_ctrl;
/* Stop pending workqueue */
if (dac33->fifo_mode)
cancel_work_sync(&dac33->work);
mutex_lock(&dac33->mutex);
pwr_ctrl = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
pwr_ctrl &= ~(DAC33_OSCPDNB | DAC33_DACRPDNB | DAC33_DACLPDNB);
dac33_write(codec, DAC33_PWR_CTRL, pwr_ctrl);
mutex_unlock(&dac33->mutex);
}
static void dac33_oscwait(struct snd_soc_codec *codec)
{
int timeout = 20;
u8 reg;
do {
msleep(1);
dac33_read(codec, DAC33_INT_OSC_STATUS, &reg);
} while (((reg & 0x03) != DAC33_OSCSTATUS_NORMAL) && timeout--);
if ((reg & 0x03) != DAC33_OSCSTATUS_NORMAL)
dev_err(codec->dev,
"internal oscillator calibration failed\n");
}
static int dac33_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;
/* Check parameters for validity */
switch (params_rate(params)) {
case 44100:
case 48000:
break;
default:
dev_err(codec->dev, "unsupported rate %d\n",
params_rate(params));
return -EINVAL;
}
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
break;
default:
dev_err(codec->dev, "unsupported format %d\n",
params_format(params));
return -EINVAL;
}
return 0;
}
#define CALC_OSCSET(rate, refclk) ( \
((((rate * 10000) / refclk) * 4096) + 7000) / 10000)
#define CALC_RATIOSET(rate, refclk) ( \
((((refclk * 100000) / rate) * 16384) + 50000) / 100000)
/*
* tlv320dac33 is strict on the sequence of the register writes, if the register
* writes happens in different order, than dac33 might end up in unknown state.
* Use the known, working sequence of register writes to initialize the dac33.
*/
static int dac33_prepare_chip(struct snd_pcm_substream *substream)
{
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 tlv320dac33_priv *dac33 = codec->private_data;
unsigned int oscset, ratioset, pwr_ctrl, reg_tmp;
u8 aictrl_a, aictrl_b, fifoctrl_a;
switch (substream->runtime->rate) {
case 44100:
case 48000:
oscset = CALC_OSCSET(substream->runtime->rate, dac33->refclk);
ratioset = CALC_RATIOSET(substream->runtime->rate,
dac33->refclk);
break;
default:
dev_err(codec->dev, "unsupported rate %d\n",
substream->runtime->rate);
return -EINVAL;
}
aictrl_a = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A);
aictrl_a &= ~(DAC33_NCYCL_MASK | DAC33_WLEN_MASK);
/* Read FIFO control A, and clear FIFO flush bit */
fifoctrl_a = dac33_read_reg_cache(codec, DAC33_FIFO_CTRL_A);
fifoctrl_a &= ~DAC33_FIFOFLUSH;
fifoctrl_a &= ~DAC33_WIDTH;
switch (substream->runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
aictrl_a |= (DAC33_NCYCL_16 | DAC33_WLEN_16);
fifoctrl_a |= DAC33_WIDTH;
break;
default:
dev_err(codec->dev, "unsupported format %d\n",
substream->runtime->format);
return -EINVAL;
}
mutex_lock(&dac33->mutex);
dac33_soft_power(codec, 1);
reg_tmp = dac33_read_reg_cache(codec, DAC33_INT_OSC_CTRL);
dac33_write(codec, DAC33_INT_OSC_CTRL, reg_tmp);
/* Write registers 0x08 and 0x09 (MSB, LSB) */
dac33_write16(codec, DAC33_INT_OSC_FREQ_RAT_A, oscset);
/* calib time: 128 is a nice number ;) */
dac33_write(codec, DAC33_CALIB_TIME, 128);
/* adjustment treshold & step */
dac33_write(codec, DAC33_INT_OSC_CTRL_B, DAC33_ADJTHRSHLD(2) |
DAC33_ADJSTEP(1));
/* div=4 / gain=1 / div */
dac33_write(codec, DAC33_INT_OSC_CTRL_C, DAC33_REFDIV(4));
pwr_ctrl = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
pwr_ctrl |= DAC33_OSCPDNB | DAC33_DACRPDNB | DAC33_DACLPDNB;
dac33_write(codec, DAC33_PWR_CTRL, pwr_ctrl);
dac33_oscwait(codec);
if (dac33->fifo_mode) {
/* Generic for all FIFO modes */
/* 50-51 : ASRC Control registers */
dac33_write(codec, DAC33_ASRC_CTRL_A, DAC33_SRCLKDIV(1));
dac33_write(codec, DAC33_ASRC_CTRL_B, 1); /* ??? */
/* Write registers 0x34 and 0x35 (MSB, LSB) */
dac33_write16(codec, DAC33_SRC_REF_CLK_RATIO_A, ratioset);
/* Set interrupts to high active */
dac33_write(codec, DAC33_INTP_CTRL_A, DAC33_INTPM_AHIGH);
} else {
/* FIFO bypass mode */
/* 50-51 : ASRC Control registers */
dac33_write(codec, DAC33_ASRC_CTRL_A, DAC33_SRCBYP);
dac33_write(codec, DAC33_ASRC_CTRL_B, 0); /* ??? */
}
/* Interrupt behaviour configuration */
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
dac33_write(codec, DAC33_FIFO_IRQ_MODE_B,
DAC33_ATM(DAC33_FIFO_IRQ_MODE_LEVEL));
dac33_write(codec, DAC33_FIFO_IRQ_MASK, DAC33_MAT);
break;
case DAC33_FIFO_MODE7:
/* Disable all interrupts */
dac33_write(codec, DAC33_FIFO_IRQ_MASK, 0);
break;
default:
/* in FIFO bypass mode, the interrupts are not used */
break;
}
aictrl_b = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B);
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
/*
* For mode1:
* Disable the FIFO bypass (Enable the use of FIFO)
* Select nSample mode
* BCLK is only running when data is needed by DAC33
*/
fifoctrl_a &= ~DAC33_FBYPAS;
fifoctrl_a &= ~DAC33_FAUTO;
aictrl_b &= ~DAC33_BCLKON;
break;
case DAC33_FIFO_MODE7:
/*
* For mode1:
* Disable the FIFO bypass (Enable the use of FIFO)
* Select Threshold mode
* BCLK is only running when data is needed by DAC33
*/
fifoctrl_a &= ~DAC33_FBYPAS;
fifoctrl_a |= DAC33_FAUTO;
aictrl_b &= ~DAC33_BCLKON;
break;
default:
/*
* For FIFO bypass mode:
* Enable the FIFO bypass (Disable the FIFO use)
* Set the BCLK as continous
*/
fifoctrl_a |= DAC33_FBYPAS;
aictrl_b |= DAC33_BCLKON;
break;
}
dac33_write(codec, DAC33_FIFO_CTRL_A, fifoctrl_a);
dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_A, aictrl_a);
dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_B, aictrl_b);
/*
* BCLK divide ratio
* 0: 1.5
* 1: 1
* 2: 2
* ...
* 254: 254
* 255: 255
*/
if (dac33->fifo_mode)
dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_C,
dac33->burst_bclkdiv);
else
dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_C, 32);
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
dac33_write16(codec, DAC33_ATHR_MSB,
DAC33_THRREG(dac33->alarm_threshold));
break;
case DAC33_FIFO_MODE7:
/*
* Configure the threshold levels, and leave 10 sample space
* at the bottom, and also at the top of the FIFO
*/
dac33_write16(codec, DAC33_UTHR_MSB,
DAC33_THRREG(DAC33_BUFFER_SIZE_SAMPLES - 10));
dac33_write16(codec, DAC33_LTHR_MSB,
DAC33_THRREG(10));
break;
default:
break;
}
mutex_unlock(&dac33->mutex);
return 0;
}
static void dac33_calculate_times(struct snd_pcm_substream *substream)
{
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 tlv320dac33_priv *dac33 = codec->private_data;
unsigned int nsample_limit;
/* Number of samples (16bit, stereo) in one period */
dac33->nsample_min = snd_pcm_lib_period_bytes(substream) / 4;
/* Number of samples (16bit, stereo) in ALSA buffer */
dac33->nsample_max = snd_pcm_lib_buffer_bytes(substream) / 4;
/* Subtract one period from the total */
dac33->nsample_max -= dac33->nsample_min;
/* Number of samples for LATENCY_TIME_MS / 2 */
dac33->alarm_threshold = substream->runtime->rate /
(1000 / (LATENCY_TIME_MS / 2));
/* Find and fix up the lowest nsmaple limit */
nsample_limit = substream->runtime->rate / (1000 / LATENCY_TIME_MS);
if (dac33->nsample_min < nsample_limit)
dac33->nsample_min = nsample_limit;
if (dac33->nsample < dac33->nsample_min)
dac33->nsample = dac33->nsample_min;
/*
* Find and fix up the highest nsmaple limit
* In order to not overflow the DAC33 buffer substract the
* alarm_threshold value from the size of the DAC33 buffer
*/
nsample_limit = DAC33_BUFFER_SIZE_SAMPLES - dac33->alarm_threshold;
if (dac33->nsample_max > nsample_limit)
dac33->nsample_max = nsample_limit;
if (dac33->nsample > dac33->nsample_max)
dac33->nsample = dac33->nsample_max;
}
static int dac33_pcm_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
dac33_calculate_times(substream);
dac33_prepare_chip(substream);
return 0;
}
static int dac33_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
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 tlv320dac33_priv *dac33 = codec->private_data;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (dac33->fifo_mode) {
dac33->state = DAC33_PREFILL;
queue_work(dac33->dac33_wq, &dac33->work);
}
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (dac33->fifo_mode) {
dac33->state = DAC33_FLUSH;
queue_work(dac33->dac33_wq, &dac33->work);
}
break;
default:
ret = -EINVAL;
}
return ret;
}
static int dac33_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 tlv320dac33_priv *dac33 = codec->private_data;
u8 ioc_reg, asrcb_reg;
ioc_reg = dac33_read_reg_cache(codec, DAC33_INT_OSC_CTRL);
asrcb_reg = dac33_read_reg_cache(codec, DAC33_ASRC_CTRL_B);
switch (clk_id) {
case TLV320DAC33_MCLK:
ioc_reg |= DAC33_REFSEL;
asrcb_reg |= DAC33_SRCREFSEL;
break;
case TLV320DAC33_SLEEPCLK:
ioc_reg &= ~DAC33_REFSEL;
asrcb_reg &= ~DAC33_SRCREFSEL;
break;
default:
dev_err(codec->dev, "Invalid clock ID (%d)\n", clk_id);
break;
}
dac33->refclk = freq;
dac33_write_reg_cache(codec, DAC33_INT_OSC_CTRL, ioc_reg);
dac33_write_reg_cache(codec, DAC33_ASRC_CTRL_B, asrcb_reg);
return 0;
}
static int dac33_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int fmt)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct tlv320dac33_priv *dac33 = codec->private_data;
u8 aictrl_a, aictrl_b;
aictrl_a = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A);
aictrl_b = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B);
/* set master/slave audio interface */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
/* Codec Master */
aictrl_a |= (DAC33_MSBCLK | DAC33_MSWCLK);
break;
case SND_SOC_DAIFMT_CBS_CFS:
/* Codec Slave */
if (dac33->fifo_mode) {
dev_err(codec->dev, "FIFO mode requires master mode\n");
return -EINVAL;
} else
aictrl_a &= ~(DAC33_MSBCLK | DAC33_MSWCLK);
break;
default:
return -EINVAL;
}
aictrl_a &= ~DAC33_AFMT_MASK;
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
aictrl_a |= DAC33_AFMT_I2S;
break;
case SND_SOC_DAIFMT_DSP_A:
aictrl_a |= DAC33_AFMT_DSP;
aictrl_b &= ~DAC33_DATA_DELAY_MASK;
aictrl_b |= DAC33_DATA_DELAY(0);
break;
case SND_SOC_DAIFMT_RIGHT_J:
aictrl_a |= DAC33_AFMT_RIGHT_J;
break;
case SND_SOC_DAIFMT_LEFT_J:
aictrl_a |= DAC33_AFMT_LEFT_J;
break;
default:
dev_err(codec->dev, "Unsupported format (%u)\n",
fmt & SND_SOC_DAIFMT_FORMAT_MASK);
return -EINVAL;
}
dac33_write_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A, aictrl_a);
dac33_write_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B, aictrl_b);
return 0;
}
static void dac33_init_chip(struct snd_soc_codec *codec)
{
/* 44-46: DAC Control Registers */
/* A : DAC sample rate Fsref/1.5 */
dac33_write(codec, DAC33_DAC_CTRL_A, DAC33_DACRATE(0));
/* B : DAC src=normal, not muted */
dac33_write(codec, DAC33_DAC_CTRL_B, DAC33_DACSRCR_RIGHT |
DAC33_DACSRCL_LEFT);
/* C : (defaults) */
dac33_write(codec, DAC33_DAC_CTRL_C, 0x00);
/* 64-65 : L&R DAC power control
Line In -> OUT 1V/V Gain, DAC -> OUT 4V/V Gain*/
dac33_write(codec, DAC33_LDAC_PWR_CTRL, DAC33_LROUT_GAIN(2));
dac33_write(codec, DAC33_RDAC_PWR_CTRL, DAC33_LROUT_GAIN(2));
/* 73 : volume soft stepping control,
clock source = internal osc (?) */
dac33_write(codec, DAC33_ANA_VOL_SOFT_STEP_CTRL, DAC33_VOLCLKEN);
/* 66 : LOP/LOM Modes */
dac33_write(codec, DAC33_OUT_AMP_CM_CTRL, 0xff);
/* 68 : LOM inverted from LOP */
dac33_write(codec, DAC33_OUT_AMP_CTRL, (3<<2));
dac33_write(codec, DAC33_PWR_CTRL, DAC33_PDNALLB);
}
static int dac33_soc_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
struct tlv320dac33_priv *dac33;
int ret = 0;
BUG_ON(!tlv320dac33_codec);
codec = tlv320dac33_codec;
socdev->card->codec = codec;
dac33 = codec->private_data;
/* Power up the codec */
dac33_hard_power(codec, 1);
/* Set default configuration */
dac33_init_chip(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");
goto pcm_err;
}
snd_soc_add_controls(codec, dac33_snd_controls,
ARRAY_SIZE(dac33_snd_controls));
/* Only add the nSample controls, if we have valid IRQ number */
if (dac33->irq >= 0)
snd_soc_add_controls(codec, dac33_nsample_snd_controls,
ARRAY_SIZE(dac33_nsample_snd_controls));
dac33_add_widgets(codec);
/* power on device */
dac33_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
/* Bias level configuration has enabled regulator an extra time */
regulator_bulk_disable(ARRAY_SIZE(dac33->supplies), dac33->supplies);
return 0;
pcm_err:
dac33_hard_power(codec, 0);
return ret;
}
static int dac33_soc_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
dac33_set_bias_level(codec, SND_SOC_BIAS_OFF);
snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);
return 0;
}
static int dac33_soc_suspend(struct platform_device *pdev, pm_message_t state)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
dac33_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static int dac33_soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
dac33_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
dac33_set_bias_level(codec, codec->suspend_bias_level);
return 0;
}
struct snd_soc_codec_device soc_codec_dev_tlv320dac33 = {
.probe = dac33_soc_probe,
.remove = dac33_soc_remove,
.suspend = dac33_soc_suspend,
.resume = dac33_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320dac33);
#define DAC33_RATES (SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000)
#define DAC33_FORMATS SNDRV_PCM_FMTBIT_S16_LE
static struct snd_soc_dai_ops dac33_dai_ops = {
.shutdown = dac33_shutdown,
.hw_params = dac33_hw_params,
.prepare = dac33_pcm_prepare,
.trigger = dac33_pcm_trigger,
.set_sysclk = dac33_set_dai_sysclk,
.set_fmt = dac33_set_dai_fmt,
};
struct snd_soc_dai dac33_dai = {
.name = "tlv320dac33",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = DAC33_RATES,
.formats = DAC33_FORMATS,},
.ops = &dac33_dai_ops,
};
EXPORT_SYMBOL_GPL(dac33_dai);
static int __devinit dac33_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tlv320dac33_platform_data *pdata;
struct tlv320dac33_priv *dac33;
struct snd_soc_codec *codec;
int ret, i;
if (client->dev.platform_data == NULL) {
dev_err(&client->dev, "Platform data not set\n");
return -ENODEV;
}
pdata = client->dev.platform_data;
dac33 = kzalloc(sizeof(struct tlv320dac33_priv), GFP_KERNEL);
if (dac33 == NULL)
return -ENOMEM;
codec = &dac33->codec;
codec->private_data = dac33;
codec->control_data = client;
mutex_init(&codec->mutex);
mutex_init(&dac33->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->name = "tlv320dac33";
codec->owner = THIS_MODULE;
codec->read = dac33_read_reg_cache;
codec->write = dac33_write_locked;
codec->hw_write = (hw_write_t) i2c_master_send;
codec->bias_level = SND_SOC_BIAS_OFF;
codec->set_bias_level = dac33_set_bias_level;
codec->dai = &dac33_dai;
codec->num_dai = 1;
codec->reg_cache_size = ARRAY_SIZE(dac33_reg);
codec->reg_cache = kmemdup(dac33_reg, ARRAY_SIZE(dac33_reg),
GFP_KERNEL);
if (codec->reg_cache == NULL) {
ret = -ENOMEM;
goto error_reg;
}
i2c_set_clientdata(client, dac33);
dac33->power_gpio = pdata->power_gpio;
dac33->burst_bclkdiv = pdata->burst_bclkdiv;
dac33->irq = client->irq;
dac33->nsample = NSAMPLE_MAX;
/* Disable FIFO use by default */
dac33->fifo_mode = DAC33_FIFO_BYPASS;
tlv320dac33_codec = codec;
codec->dev = &client->dev;
dac33_dai.dev = codec->dev;
/* Check if the reset GPIO number is valid and request it */
if (dac33->power_gpio >= 0) {
ret = gpio_request(dac33->power_gpio, "tlv320dac33 reset");
if (ret < 0) {
dev_err(codec->dev,
"Failed to request reset GPIO (%d)\n",
dac33->power_gpio);
snd_soc_unregister_dai(&dac33_dai);
snd_soc_unregister_codec(codec);
goto error_gpio;
}
gpio_direction_output(dac33->power_gpio, 0);
} else {
dac33->chip_power = 1;
}
/* Check if the IRQ number is valid and request it */
if (dac33->irq >= 0) {
ret = request_irq(dac33->irq, dac33_interrupt_handler,
IRQF_TRIGGER_RISING | IRQF_DISABLED,
codec->name, codec);
if (ret < 0) {
dev_err(codec->dev, "Could not request IRQ%d (%d)\n",
dac33->irq, ret);
dac33->irq = -1;
}
if (dac33->irq != -1) {
/* Setup work queue */
dac33->dac33_wq =
create_singlethread_workqueue("tlv320dac33");
if (dac33->dac33_wq == NULL) {
free_irq(dac33->irq, &dac33->codec);
ret = -ENOMEM;
goto error_wq;
}
INIT_WORK(&dac33->work, dac33_work);
}
}
for (i = 0; i < ARRAY_SIZE(dac33->supplies); i++)
dac33->supplies[i].supply = dac33_supply_names[i];
ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(dac33->supplies),
dac33->supplies);
if (ret != 0) {
dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
goto err_get;
}
ret = regulator_bulk_enable(ARRAY_SIZE(dac33->supplies),
dac33->supplies);
if (ret != 0) {
dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
goto err_enable;
}
ret = snd_soc_register_codec(codec);
if (ret != 0) {
dev_err(codec->dev, "Failed to register codec: %d\n", ret);
goto error_codec;
}
ret = snd_soc_register_dai(&dac33_dai);
if (ret != 0) {
dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
snd_soc_unregister_codec(codec);
goto error_codec;
}
/* Shut down the codec for now */
dac33_hard_power(codec, 0);
return ret;
error_codec:
regulator_bulk_disable(ARRAY_SIZE(dac33->supplies), dac33->supplies);
err_enable:
regulator_bulk_free(ARRAY_SIZE(dac33->supplies), dac33->supplies);
err_get:
if (dac33->irq >= 0) {
free_irq(dac33->irq, &dac33->codec);
destroy_workqueue(dac33->dac33_wq);
}
error_wq:
if (dac33->power_gpio >= 0)
gpio_free(dac33->power_gpio);
error_gpio:
kfree(codec->reg_cache);
error_reg:
tlv320dac33_codec = NULL;
kfree(dac33);
return ret;
}
static int __devexit dac33_i2c_remove(struct i2c_client *client)
{
struct tlv320dac33_priv *dac33;
dac33 = i2c_get_clientdata(client);
dac33_hard_power(&dac33->codec, 0);
if (dac33->power_gpio >= 0)
gpio_free(dac33->power_gpio);
if (dac33->irq >= 0)
free_irq(dac33->irq, &dac33->codec);
regulator_bulk_free(ARRAY_SIZE(dac33->supplies), dac33->supplies);
destroy_workqueue(dac33->dac33_wq);
snd_soc_unregister_dai(&dac33_dai);
snd_soc_unregister_codec(&dac33->codec);
kfree(dac33->codec.reg_cache);
kfree(dac33);
tlv320dac33_codec = NULL;
return 0;
}
static const struct i2c_device_id tlv320dac33_i2c_id[] = {
{
.name = "tlv320dac33",
.driver_data = 0,
},
{ },
};
static struct i2c_driver tlv320dac33_i2c_driver = {
.driver = {
.name = "tlv320dac33",
.owner = THIS_MODULE,
},
.probe = dac33_i2c_probe,
.remove = __devexit_p(dac33_i2c_remove),
.id_table = tlv320dac33_i2c_id,
};
static int __init dac33_module_init(void)
{
int r;
r = i2c_add_driver(&tlv320dac33_i2c_driver);
if (r < 0) {
printk(KERN_ERR "DAC33: driver registration failed\n");
return r;
}
return 0;
}
module_init(dac33_module_init);
static void __exit dac33_module_exit(void)
{
i2c_del_driver(&tlv320dac33_i2c_driver);
}
module_exit(dac33_module_exit);
MODULE_DESCRIPTION("ASoC TLV320DAC33 codec driver");
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
MODULE_LICENSE("GPL");