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linux_dsm_epyc7002/sound/soc/codecs/ak4613.c
Kuninori Morimoto 03bbf9f5e4
ASoC: ak4613: call dummy write for PW_MGMT1/3 when Playback 
Power Down Release Command (PMVR, PMDAC, RSTN, PMDA1-PMDA6)
which are located on PW_MGMT1 / PW_MGMT3 register must be
write again after at least 5 LRCK cycle or later on each command.
Otherwise, Playback volume will be 0dB.
Basically, it should be

        1.   PowerDownRelease by Power Management1 <= call 1.x after 5LRCK
        1.x  Dummy write      to Power Management1
        2.   PowerDownRelease by Power Management3 <= call 2.x after 5LRCK
        2.x  Dummy write      to Power Management3

To avoid too many dummy write, this patch is merging these.

        1.   PowerDownRelease by Power Management1
        2.   PowerDownRelease by Power Management3   <= call after 5LRCK
        2.x  Dummy write      to Power Management1/3 <= merge dummy write

This patch adds dummy write when Playback Start timing.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-01-24 11:31:25 +00:00

705 lines
17 KiB
C
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/*
* ak4613.c -- Asahi Kasei ALSA Soc Audio driver
*
* Copyright (C) 2015 Renesas Electronics Corporation
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*
* Based on ak4642.c by Kuninori Morimoto
* Based on wm8731.c by Richard Purdie
* Based on ak4535.c by Richard Purdie
* Based on wm8753.c by Liam Girdwood
*
* 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.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#define PW_MGMT1 0x00 /* Power Management 1 */
#define PW_MGMT2 0x01 /* Power Management 2 */
#define PW_MGMT3 0x02 /* Power Management 3 */
#define CTRL1 0x03 /* Control 1 */
#define CTRL2 0x04 /* Control 2 */
#define DEMP1 0x05 /* De-emphasis1 */
#define DEMP2 0x06 /* De-emphasis2 */
#define OFD 0x07 /* Overflow Detect */
#define ZRD 0x08 /* Zero Detect */
#define ICTRL 0x09 /* Input Control */
#define OCTRL 0x0a /* Output Control */
#define LOUT1 0x0b /* LOUT1 Volume Control */
#define ROUT1 0x0c /* ROUT1 Volume Control */
#define LOUT2 0x0d /* LOUT2 Volume Control */
#define ROUT2 0x0e /* ROUT2 Volume Control */
#define LOUT3 0x0f /* LOUT3 Volume Control */
#define ROUT3 0x10 /* ROUT3 Volume Control */
#define LOUT4 0x11 /* LOUT4 Volume Control */
#define ROUT4 0x12 /* ROUT4 Volume Control */
#define LOUT5 0x13 /* LOUT5 Volume Control */
#define ROUT5 0x14 /* ROUT5 Volume Control */
#define LOUT6 0x15 /* LOUT6 Volume Control */
#define ROUT6 0x16 /* ROUT6 Volume Control */
/* PW_MGMT1 */
#define RSTN BIT(0)
#define PMDAC BIT(1)
#define PMADC BIT(2)
#define PMVR BIT(3)
/* PW_MGMT2 */
#define PMAD_ALL 0x7
/* PW_MGMT3 */
#define PMDA_ALL 0x3f
/* CTRL1 */
#define DIF0 BIT(3)
#define DIF1 BIT(4)
#define DIF2 BIT(5)
#define TDM0 BIT(6)
#define TDM1 BIT(7)
#define NO_FMT (0xff)
#define FMT_MASK (0xf8)
/* CTRL2 */
#define DFS_MASK (3 << 2)
#define DFS_NORMAL_SPEED (0 << 2)
#define DFS_DOUBLE_SPEED (1 << 2)
#define DFS_QUAD_SPEED (2 << 2)
/* ICTRL */
#define ICTRL_MASK (0x3)
/* OCTRL */
#define OCTRL_MASK (0x3F)
struct ak4613_formats {
unsigned int width;
unsigned int fmt;
};
struct ak4613_interface {
struct ak4613_formats capture;
struct ak4613_formats playback;
};
struct ak4613_priv {
struct mutex lock;
const struct ak4613_interface *iface;
struct snd_pcm_hw_constraint_list constraint;
struct work_struct dummy_write_work;
struct snd_soc_component *component;
unsigned int rate;
unsigned int sysclk;
unsigned int fmt;
u8 oc;
u8 ic;
int cnt;
};
/*
* Playback Volume
*
* max : 0x00 : 0 dB
* ( 0.5 dB step )
* min : 0xFE : -127.0 dB
* mute: 0xFF
*/
static const DECLARE_TLV_DB_SCALE(out_tlv, -12750, 50, 1);
static const struct snd_kcontrol_new ak4613_snd_controls[] = {
SOC_DOUBLE_R_TLV("Digital Playback Volume1", LOUT1, ROUT1,
0, 0xFF, 1, out_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume2", LOUT2, ROUT2,
0, 0xFF, 1, out_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume3", LOUT3, ROUT3,
0, 0xFF, 1, out_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume4", LOUT4, ROUT4,
0, 0xFF, 1, out_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume5", LOUT5, ROUT5,
0, 0xFF, 1, out_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume6", LOUT6, ROUT6,
0, 0xFF, 1, out_tlv),
};
static const struct reg_default ak4613_reg[] = {
{ 0x0, 0x0f }, { 0x1, 0x07 }, { 0x2, 0x3f }, { 0x3, 0x20 },
{ 0x4, 0x20 }, { 0x5, 0x55 }, { 0x6, 0x05 }, { 0x7, 0x07 },
{ 0x8, 0x0f }, { 0x9, 0x07 }, { 0xa, 0x3f }, { 0xb, 0x00 },
{ 0xc, 0x00 }, { 0xd, 0x00 }, { 0xe, 0x00 }, { 0xf, 0x00 },
{ 0x10, 0x00 }, { 0x11, 0x00 }, { 0x12, 0x00 }, { 0x13, 0x00 },
{ 0x14, 0x00 }, { 0x15, 0x00 }, { 0x16, 0x00 },
};
#define AUDIO_IFACE_TO_VAL(fmts) ((fmts - ak4613_iface) << 3)
#define AUDIO_IFACE(b, fmt) { b, SND_SOC_DAIFMT_##fmt }
static const struct ak4613_interface ak4613_iface[] = {
/* capture */ /* playback */
/* [0] - [2] are not supported */
[3] = { AUDIO_IFACE(24, LEFT_J), AUDIO_IFACE(24, LEFT_J) },
[4] = { AUDIO_IFACE(24, I2S), AUDIO_IFACE(24, I2S) },
};
static const struct regmap_config ak4613_regmap_cfg = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x16,
.reg_defaults = ak4613_reg,
.num_reg_defaults = ARRAY_SIZE(ak4613_reg),
.cache_type = REGCACHE_RBTREE,
};
static const struct of_device_id ak4613_of_match[] = {
{ .compatible = "asahi-kasei,ak4613", .data = &ak4613_regmap_cfg },
{},
};
MODULE_DEVICE_TABLE(of, ak4613_of_match);
static const struct i2c_device_id ak4613_i2c_id[] = {
{ "ak4613", (kernel_ulong_t)&ak4613_regmap_cfg },
{ }
};
MODULE_DEVICE_TABLE(i2c, ak4613_i2c_id);
static const struct snd_soc_dapm_widget ak4613_dapm_widgets[] = {
/* Outputs */
SND_SOC_DAPM_OUTPUT("LOUT1"),
SND_SOC_DAPM_OUTPUT("LOUT2"),
SND_SOC_DAPM_OUTPUT("LOUT3"),
SND_SOC_DAPM_OUTPUT("LOUT4"),
SND_SOC_DAPM_OUTPUT("LOUT5"),
SND_SOC_DAPM_OUTPUT("LOUT6"),
SND_SOC_DAPM_OUTPUT("ROUT1"),
SND_SOC_DAPM_OUTPUT("ROUT2"),
SND_SOC_DAPM_OUTPUT("ROUT3"),
SND_SOC_DAPM_OUTPUT("ROUT4"),
SND_SOC_DAPM_OUTPUT("ROUT5"),
SND_SOC_DAPM_OUTPUT("ROUT6"),
/* Inputs */
SND_SOC_DAPM_INPUT("LIN1"),
SND_SOC_DAPM_INPUT("LIN2"),
SND_SOC_DAPM_INPUT("RIN1"),
SND_SOC_DAPM_INPUT("RIN2"),
/* DAC */
SND_SOC_DAPM_DAC("DAC1", NULL, PW_MGMT3, 0, 0),
SND_SOC_DAPM_DAC("DAC2", NULL, PW_MGMT3, 1, 0),
SND_SOC_DAPM_DAC("DAC3", NULL, PW_MGMT3, 2, 0),
SND_SOC_DAPM_DAC("DAC4", NULL, PW_MGMT3, 3, 0),
SND_SOC_DAPM_DAC("DAC5", NULL, PW_MGMT3, 4, 0),
SND_SOC_DAPM_DAC("DAC6", NULL, PW_MGMT3, 5, 0),
/* ADC */
SND_SOC_DAPM_ADC("ADC1", NULL, PW_MGMT2, 0, 0),
SND_SOC_DAPM_ADC("ADC2", NULL, PW_MGMT2, 1, 0),
};
static const struct snd_soc_dapm_route ak4613_intercon[] = {
{"LOUT1", NULL, "DAC1"},
{"LOUT2", NULL, "DAC2"},
{"LOUT3", NULL, "DAC3"},
{"LOUT4", NULL, "DAC4"},
{"LOUT5", NULL, "DAC5"},
{"LOUT6", NULL, "DAC6"},
{"ROUT1", NULL, "DAC1"},
{"ROUT2", NULL, "DAC2"},
{"ROUT3", NULL, "DAC3"},
{"ROUT4", NULL, "DAC4"},
{"ROUT5", NULL, "DAC5"},
{"ROUT6", NULL, "DAC6"},
{"DAC1", NULL, "Playback"},
{"DAC2", NULL, "Playback"},
{"DAC3", NULL, "Playback"},
{"DAC4", NULL, "Playback"},
{"DAC5", NULL, "Playback"},
{"DAC6", NULL, "Playback"},
{"Capture", NULL, "ADC1"},
{"Capture", NULL, "ADC2"},
{"ADC1", NULL, "LIN1"},
{"ADC2", NULL, "LIN2"},
{"ADC1", NULL, "RIN1"},
{"ADC2", NULL, "RIN2"},
};
static void ak4613_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
struct device *dev = codec->dev;
mutex_lock(&priv->lock);
priv->cnt--;
if (priv->cnt < 0) {
dev_err(dev, "unexpected counter error\n");
priv->cnt = 0;
}
if (!priv->cnt)
priv->iface = NULL;
mutex_unlock(&priv->lock);
}
static void ak4613_hw_constraints(struct ak4613_priv *priv,
struct snd_pcm_runtime *runtime)
{
static const unsigned int ak4613_rates[] = {
32000,
44100,
48000,
64000,
88200,
96000,
176400,
192000,
};
struct snd_pcm_hw_constraint_list *constraint = &priv->constraint;
unsigned int fs;
int i;
constraint->list = ak4613_rates;
constraint->mask = 0;
constraint->count = 0;
/*
* Slave Mode
* Normal: [32kHz, 48kHz] : 256fs,384fs or 512fs
* Double: [64kHz, 96kHz] : 256fs
* Quad : [128kHz,192kHz]: 128fs
*
* Master mode
* Normal: [32kHz, 48kHz] : 256fs or 512fs
* Double: [64kHz, 96kHz] : 256fs
* Quad : [128kHz,192kHz]: 128fs
*/
for (i = 0; i < ARRAY_SIZE(ak4613_rates); i++) {
/* minimum fs on each range */
fs = (ak4613_rates[i] <= 96000) ? 256 : 128;
if (priv->sysclk >= ak4613_rates[i] * fs)
constraint->count = i + 1;
}
snd_pcm_hw_constraint_list(runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, constraint);
}
static int ak4613_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
priv->cnt++;
ak4613_hw_constraints(priv, substream->runtime);
return 0;
}
static int ak4613_dai_set_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
priv->sysclk = freq;
return 0;
}
static int ak4613_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct snd_soc_codec *codec = dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
fmt &= SND_SOC_DAIFMT_FORMAT_MASK;
switch (fmt) {
case SND_SOC_DAIFMT_LEFT_J:
case SND_SOC_DAIFMT_I2S:
priv->fmt = fmt;
break;
default:
return -EINVAL;
}
return 0;
}
static bool ak4613_dai_fmt_matching(const struct ak4613_interface *iface,
int is_play,
unsigned int fmt, unsigned int width)
{
const struct ak4613_formats *fmts;
fmts = (is_play) ? &iface->playback : &iface->capture;
if (fmts->fmt != fmt)
return false;
if (fmts->width != width)
return false;
return true;
}
static int ak4613_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
const struct ak4613_interface *iface;
struct device *dev = codec->dev;
unsigned int width = params_width(params);
unsigned int fmt = priv->fmt;
unsigned int rate;
int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
int i, ret;
u8 fmt_ctrl, ctrl2;
rate = params_rate(params);
switch (rate) {
case 32000:
case 44100:
case 48000:
ctrl2 = DFS_NORMAL_SPEED;
break;
case 64000:
case 88200:
case 96000:
ctrl2 = DFS_DOUBLE_SPEED;
break;
case 176400:
case 192000:
ctrl2 = DFS_QUAD_SPEED;
break;
default:
return -EINVAL;
}
priv->rate = rate;
/*
* FIXME
*
* It doesn't support TDM at this point
*/
fmt_ctrl = NO_FMT;
ret = -EINVAL;
iface = NULL;
mutex_lock(&priv->lock);
if (priv->iface) {
if (ak4613_dai_fmt_matching(priv->iface, is_play, fmt, width))
iface = priv->iface;
} else {
for (i = ARRAY_SIZE(ak4613_iface) - 1; i >= 0; i--) {
if (!ak4613_dai_fmt_matching(ak4613_iface + i,
is_play,
fmt, width))
continue;
iface = ak4613_iface + i;
break;
}
}
if ((priv->iface == NULL) ||
(priv->iface == iface)) {
priv->iface = iface;
ret = 0;
}
mutex_unlock(&priv->lock);
if (ret < 0)
goto hw_params_end;
fmt_ctrl = AUDIO_IFACE_TO_VAL(iface);
snd_soc_update_bits(codec, CTRL1, FMT_MASK, fmt_ctrl);
snd_soc_update_bits(codec, CTRL2, DFS_MASK, ctrl2);
snd_soc_update_bits(codec, ICTRL, ICTRL_MASK, priv->ic);
snd_soc_update_bits(codec, OCTRL, OCTRL_MASK, priv->oc);
hw_params_end:
if (ret < 0)
dev_warn(dev, "unsupported data width/format combination\n");
return ret;
}
static int ak4613_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
u8 mgmt1 = 0;
switch (level) {
case SND_SOC_BIAS_ON:
mgmt1 |= RSTN;
/* fall through */
case SND_SOC_BIAS_PREPARE:
mgmt1 |= PMADC | PMDAC;
/* fall through */
case SND_SOC_BIAS_STANDBY:
mgmt1 |= PMVR;
/* fall through */
case SND_SOC_BIAS_OFF:
default:
break;
}
snd_soc_write(codec, PW_MGMT1, mgmt1);
return 0;
}
static void ak4613_dummy_write(struct work_struct *work)
{
struct ak4613_priv *priv = container_of(work,
struct ak4613_priv,
dummy_write_work);
struct snd_soc_component *component = priv->component;
unsigned int mgmt1;
unsigned int mgmt3;
/*
* PW_MGMT1 / PW_MGMT3 needs dummy write at least after 5 LR clocks
*
* Note
*
* To avoid extra delay, we want to avoid preemption here,
* but we can't. Because it uses I2C access which is using IRQ
* and sleep. Thus, delay might be more than 5 LR clocks
* see also
* ak4613_dai_trigger()
*/
udelay(5000000 / priv->rate);
snd_soc_component_read(component, PW_MGMT1, &mgmt1);
snd_soc_component_read(component, PW_MGMT3, &mgmt3);
snd_soc_component_write(component, PW_MGMT1, mgmt1);
snd_soc_component_write(component, PW_MGMT3, mgmt3);
}
static int ak4613_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
/*
* FIXME
*
* PW_MGMT1 / PW_MGMT3 needs dummy write at least after 5 LR clocks
* from Power Down Release. Otherwise, Playback volume will be 0dB.
* To avoid complex multiple delay/dummy_write method from
* ak4613_set_bias_level() / SND_SOC_DAPM_DAC_E("DACx", ...),
* call it once here.
*
* But, unfortunately, we can't "write" here because here is atomic
* context (It uses I2C access for writing).
* Thus, use schedule_work() to switching to normal context
* immediately.
*
* Note
*
* Calling ak4613_dummy_write() function might be delayed.
* In such case, ak4613 volume might be temporarily 0dB when
* beggining of playback.
* see also
* ak4613_dummy_write()
*/
if ((cmd != SNDRV_PCM_TRIGGER_START) &&
(cmd != SNDRV_PCM_TRIGGER_RESUME))
return 0;
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return 0;
priv->component = &codec->component;
schedule_work(&priv->dummy_write_work);
return 0;
}
static const struct snd_soc_dai_ops ak4613_dai_ops = {
.startup = ak4613_dai_startup,
.shutdown = ak4613_dai_shutdown,
.set_sysclk = ak4613_dai_set_sysclk,
.set_fmt = ak4613_dai_set_fmt,
.trigger = ak4613_dai_trigger,
.hw_params = ak4613_dai_hw_params,
};
#define AK4613_PCM_RATE (SNDRV_PCM_RATE_32000 |\
SNDRV_PCM_RATE_44100 |\
SNDRV_PCM_RATE_48000 |\
SNDRV_PCM_RATE_64000 |\
SNDRV_PCM_RATE_88200 |\
SNDRV_PCM_RATE_96000 |\
SNDRV_PCM_RATE_176400 |\
SNDRV_PCM_RATE_192000)
#define AK4613_PCM_FMTBIT (SNDRV_PCM_FMTBIT_S24_LE)
static struct snd_soc_dai_driver ak4613_dai = {
.name = "ak4613-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = AK4613_PCM_RATE,
.formats = AK4613_PCM_FMTBIT,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = AK4613_PCM_RATE,
.formats = AK4613_PCM_FMTBIT,
},
.ops = &ak4613_dai_ops,
.symmetric_rates = 1,
};
static int ak4613_suspend(struct snd_soc_codec *codec)
{
struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
regcache_cache_only(regmap, true);
regcache_mark_dirty(regmap);
return 0;
}
static int ak4613_resume(struct snd_soc_codec *codec)
{
struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
regcache_cache_only(regmap, false);
return regcache_sync(regmap);
}
static const struct snd_soc_codec_driver soc_codec_dev_ak4613 = {
.suspend = ak4613_suspend,
.resume = ak4613_resume,
.set_bias_level = ak4613_set_bias_level,
.component_driver = {
.controls = ak4613_snd_controls,
.num_controls = ARRAY_SIZE(ak4613_snd_controls),
.dapm_widgets = ak4613_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(ak4613_dapm_widgets),
.dapm_routes = ak4613_intercon,
.num_dapm_routes = ARRAY_SIZE(ak4613_intercon),
},
};
static void ak4613_parse_of(struct ak4613_priv *priv,
struct device *dev)
{
struct device_node *np = dev->of_node;
char prop[32];
int i;
/* Input 1 - 2 */
for (i = 0; i < 2; i++) {
snprintf(prop, sizeof(prop), "asahi-kasei,in%d-single-end", i + 1);
if (!of_get_property(np, prop, NULL))
priv->ic |= 1 << i;
}
/* Output 1 - 6 */
for (i = 0; i < 6; i++) {
snprintf(prop, sizeof(prop), "asahi-kasei,out%d-single-end", i + 1);
if (!of_get_property(np, prop, NULL))
priv->oc |= 1 << i;
}
}
static int ak4613_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct device *dev = &i2c->dev;
struct device_node *np = dev->of_node;
const struct regmap_config *regmap_cfg;
struct regmap *regmap;
struct ak4613_priv *priv;
regmap_cfg = NULL;
if (np) {
const struct of_device_id *of_id;
of_id = of_match_device(ak4613_of_match, dev);
if (of_id)
regmap_cfg = of_id->data;
} else {
regmap_cfg = (const struct regmap_config *)id->driver_data;
}
if (!regmap_cfg)
return -EINVAL;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
ak4613_parse_of(priv, dev);
priv->iface = NULL;
priv->cnt = 0;
priv->sysclk = 0;
INIT_WORK(&priv->dummy_write_work, ak4613_dummy_write);
mutex_init(&priv->lock);
i2c_set_clientdata(i2c, priv);
regmap = devm_regmap_init_i2c(i2c, regmap_cfg);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return snd_soc_register_codec(dev, &soc_codec_dev_ak4613,
&ak4613_dai, 1);
}
static int ak4613_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
return 0;
}
static struct i2c_driver ak4613_i2c_driver = {
.driver = {
.name = "ak4613-codec",
.of_match_table = ak4613_of_match,
},
.probe = ak4613_i2c_probe,
.remove = ak4613_i2c_remove,
.id_table = ak4613_i2c_id,
};
module_i2c_driver(ak4613_i2c_driver);
MODULE_DESCRIPTION("Soc AK4613 driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_LICENSE("GPL v2");
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