[alsa-devel] [PATCH 1/4] ASoC: ak5702: add support for ak5702 -- 4ch ADC
Lars-Peter Clausen
lars at metafoo.de
Mon Oct 29 13:41:44 CET 2012
Hi,
On 10/29/2012 09:43 AM, Paolo Doz wrote:
> This codec driver adds support for Asahi Kasei AK5702.
>
> Signed-off-by: Paolo Doz <paolo.doz at gmail.com>
Your mail client seems to have messed up the patches. Tabs replaces with
spaces, inserted a few extra newlines, etc.
Also, there is not really a need to have this split out over 4 commits. In
fact it makes things harder to review.
> ---
> sound/soc/codecs/ak5702.c | 728
> +++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 728 insertions(+)
> create mode 100644 sound/soc/codecs/ak5702.c
>
> diff --git a/sound/soc/codecs/ak5702.c b/sound/soc/codecs/ak5702.c
> new file mode 100644
> index 0000000..47c2e52
> --- /dev/null
> +++ b/sound/soc/codecs/ak5702.c
> @@ -0,0 +1,728 @@
> +/*
> + * ak5702.c -- AK5702 ALSA SoC driver
> + *
> + * Author: Paolo Doz <paolo.doz at gmail.com>
> + * Copyright: (C) 2012 Soft In S.r.l.
> + * 2009 Freescale Semiconductor, Inc. All rights reserved.
> + *
> + * 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 code comes from the original Freescale Ak5702 Audio driver
> + */
> +
> +/* #define DEBUG 1 */
> +
> +#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 <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 <linux/slab.h>
> +#include <linux/debugfs.h>
> +
> +#include <sound/ak5702.h>
> +#include "ak5702.h"
> +
> +#define AK5702_VERSION "0.2"
> +#define DRV_NAME "ak5702"
> +
> +/* codec private data */
> +struct ak5702_priv {
> + enum snd_soc_control_type control_type;
> + void *control_data;
> + unsigned int sysclk;
> + enum ak5702_clock_mode clock_mode;
> + struct dentry *debugfs;
> +};
> +
> +/*
> + * ak5702 register cache
> + */
> +static u16 ak5702_reg[AK5702_CACHEREGNUM] = {
> + 0x00, 0x24, 0x00, 0x01, 0x23, 0x1f,
> + 0x00, 0x01, 0x91, 0x00, 0xe1, 0x00,
> + 0xa0, 0x00, 0x00, 0x00, 0x01, 0x20,
> + 0x00, 0x00, 0x01, 0x91, 0x00, 0xe1,
> + 0x00,
> +};
> +
> +/*
> + * read ak5702 register cache
> + */
> +static inline unsigned int ak5702_read_reg_cache(struct snd_soc_codec
> *codec,
> + unsigned int reg)
> +{
> + u16 *cache = codec->reg_cache;
> +
> + if (reg >= AK5702_CACHEREGNUM)
> + return -1;
> + return cache[reg];
> +}
> +
> +/*
> + * write ak5702 register cache
> + */
> +static inline void ak5702_write_reg_cache(struct snd_soc_codec *codec,
> + u16 reg, unsigned int value)
> +{
> + u16 *cache = codec->reg_cache;
> +
> + if (reg >= AK5702_CACHEREGNUM)
> + return;
> + cache[reg] = value;
> + ak5702_reg[reg] = value;
> +}
> +
> +/*
> + * write to the AK5702 register space
> + */
> +static int ak5702_write(struct snd_soc_codec *codec, unsigned int reg,
> + unsigned int value)
> +{
> + u8 data[2];
> + data[0] = reg & 0xff;
> + data[1] = value & 0xff;
> +
> + if (codec->hw_write(codec->control_data, data, 2) == 2) {
> + pr_debug("I2c write success @ reg = %x, val = %x\n",
> + data[0], data[1]);
> + ak5702_write_reg_cache(codec, reg, value);
> + return 0;
> + } else {
> + pr_debug("I2c write error reg = %x, val = %x\n",
> + data[0], data[1]);
> + return -EIO;
> + }
> +}
> +
> +#ifdef CONFIG_DEBUG_FS
> +static int ak5702_show(struct seq_file *s, void *unused)
> +{
> +#define REG(r) { r, #r }
> + static const struct {
> + int offset;
> + const char *name;
> + } regs[] = {
> + REG(AK5702_PM1),
> + REG(AK5702_PLL1),
> + REG(AK5702_SIG1),
> + REG(AK5702_MICG1),
> + REG(AK5702_FMT1),
> + REG(AK5702_FS1),
> + REG(AK5702_CLK1),
> + REG(AK5702_VOLCTRL1),
> + REG(AK5702_LVOL1),
> + REG(AK5702_RVOL1),
> + REG(AK5702_TIMER1),
> + REG(AK5702_ALC11),
> + REG(AK5702_ALC12),
> + REG(AK5702_MODE11),
> + REG(AK5702_MODE12),
> + REG(AK5702_MODE13),
> +
> + REG(AK5702_PM2),
> + REG(AK5702_PLL2),
> + REG(AK5702_SIG2),
> + REG(AK5702_MICG2),
> + REG(AK5702_FMT2),
> + REG(AK5702_FS2),
> + REG(AK5702_CLK2),
> + REG(AK5702_VOLCTRL2),
> + REG(AK5702_LVOL2),
> + REG(AK5702_RVOL2),
> + REG(AK5702_TIMER2),
> + REG(AK5702_ALC21),
> + REG(AK5702_ALC22),
> + REG(AK5702_MODE21),
> + REG(AK5702_MODE22),
> + };
> +#undef REG
> +
> + int i;
> + for (i = 0; i < ARRAY_SIZE(ak5702_reg); i++) {
> + seq_printf(s, "%s = 0x%02x\n", regs[i].name,
> + ak5702_reg[regs[i].offset]);
> + }
> +
> + return 0;
> +}
> +
> +static int ak5702_debug_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, ak5702_show, inode->i_private);
> +}
> +
> +static const struct file_operations ak5702_debug_fops = {
> + .open = ak5702_debug_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +static void ak5702_debug_add(struct ak5702_priv *ak5702)
> +{
> + char name[] = DRV_NAME ".0";
> +
> + snprintf(name, sizeof(name), DRV_NAME);
> + ak5702->debugfs = debugfs_create_file(name, S_IRUGO,
> + snd_soc_debugfs_root, ak5702, &ak5702_debug_fops);
> +}
> +
> +static void ak5702_debug_remove(struct ak5702_priv *ak5702)
> +{
> + if (ak5702->debugfs)
> + debugfs_remove(ak5702->debugfs);
> +}
> +#else
> +static inline void ak5702_debug_add(struct ak5702_priv *ak5702)
> +{
> +}
> +
> +static inline void ak5702_debug_remove(struct ak5702_priv *ak5702)
> +{
> +}
> +#endif
You should really use regmap for register IO and register debugfs.
> +
> +static const char *ak5702_mic_gain[] = { "0dB", "+15dB", "+30dB", "+
36dB"
> };
Uhm... no. Use a proper volume control with a TLV, instead of enum.
> +static const char *ak5702_adc_input_type[] = {
> + "Single-ended", "Full-differential" };
Is this really something that should be runtime configurable. I'd image this
to depend on the board setup, so it should go into platform data
> +static const char *ak5702_adca_left_input[] = { "LIN1", "LIN2" };
> +static const char *ak5702_adca_right_input[] = { "RIN1", "RIN2" };
> +static const char *ak5702_adca_left5[] = { "LIN1-2", "LIN5" };
> +static const char *ak5702_adca_right5[] = { "RIN1-2", "RIN5" };
> +
> +static const char *ak5702_adcb_left_input[] = { "LIN3", "LIN4" };
> +static const char *ak5702_adcb_right_input[] = { "RIN3", "RIN4" };
> +static const char *ak5702_adcb_left5[] = { "LIN3-4", "LIN5" };
> +static const char *ak5702_adcb_right5[] = { "RIN3-4", "RIN5" };
These all look as if they should be implemented as DAPM Muxes as they
contain routing information.
> +
> +static const char *ak5702_input_vol_control[] = { "Independent",
> "Dependent" };
Not a 100% what this does, but should this really be runtime configurable?
> +static const char *ak5702_mic_power[] = { "Off", "On" };
Power management should be done by DAPM
> +
> +static const struct soc_enum ak5702_enum[] = {
No array here please, just makes things pretty hard to follow and easily
opens up a path for errors, when you access the array like ak5702_enum[x].
> + SOC_ENUM_SINGLE(AK5702_MICG1, 0, 4, ak5702_mic_gain),
> + SOC_ENUM_SINGLE(AK5702_MICG2, 0, 4, ak5702_mic_gain),
> +
> + SOC_ENUM_SINGLE(AK5702_SIG1, 0, 2, ak5702_adca_left_input),
> + SOC_ENUM_SINGLE(AK5702_SIG1, 1, 2, ak5702_adca_right_input),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 0, 2, ak5702_adcb_left_input),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 1, 2, ak5702_adcb_right_input),
> +
> + SOC_ENUM_SINGLE(AK5702_SIG1, 2, 2, ak5702_adc_input_type),
> + SOC_ENUM_SINGLE(AK5702_SIG1, 3, 2, ak5702_adc_input_type),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 2, 2, ak5702_adc_input_type),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 3, 2, ak5702_adc_input_type),
> +
> + SOC_ENUM_SINGLE(AK5702_VOLCTRL1, 0, 2, ak5702_input_vol_control),
> + SOC_ENUM_SINGLE(AK5702_VOLCTRL2, 0, 2, ak5702_input_vol_control),
> +
> + SOC_ENUM_SINGLE(AK5702_SIG1, 5, 2, ak5702_adca_left5),
> + SOC_ENUM_SINGLE(AK5702_SIG1, 6, 2, ak5702_adca_right5),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 5, 2, ak5702_adcb_left5),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 6, 2, ak5702_adcb_right5),
> +
> + SOC_ENUM_SINGLE(AK5702_SIG1, 4, 2, ak5702_mic_power),
> + SOC_ENUM_SINGLE(AK5702_SIG2, 4, 2, ak5702_mic_power),
> +};
> +
> +static const struct snd_kcontrol_new ak5702_snd_controls[] = {
> + SOC_SINGLE("ADCA Left Vol", AK5702_LVOL1, 0, 242, 0),
> + SOC_SINGLE("ADCA Right Vol", AK5702_RVOL1, 0, 242, 0),
> + SOC_SINGLE("ADCB Left Vol", AK5702_LVOL2, 0, 242, 0),
> + SOC_SINGLE("ADCB Right Vol", AK5702_RVOL2, 0, 242, 0),
If this is known please provide TLV dB informations for the controls.
Also please stick so standard ALSA control namings. Volume controls should
end with "Volume".
> +
> + SOC_ENUM("MIC-AmpA Gain", ak5702_enum[0]),
> + SOC_ENUM("MIC-AmpB Gain", ak5702_enum[1]),
> +
> + SOC_ENUM("ADCA Left Source", ak5702_enum[2]),
> + SOC_ENUM("ADCA Right Source", ak5702_enum[3]),
> + SOC_ENUM("ADCB Left Source", ak5702_enum[4]),
> + SOC_ENUM("ADCB Right Source", ak5702_enum[5]),
> +
> + SOC_ENUM("ADCA Left Type", ak5702_enum[6]),
> + SOC_ENUM("ADCA Right Type", ak5702_enum[7]),
> + SOC_ENUM("ADCB Left Type", ak5702_enum[8]),
> + SOC_ENUM("ADCB Right Type", ak5702_enum[9]),
> +
> + SOC_ENUM("ADCA Input Vol mode", ak5702_enum[10]),
> + SOC_ENUM("ADCB Input Vol mode", ak5702_enum[11]),
> +
> + SOC_ENUM("ADCA LIN5 Source", ak5702_enum[12]),
> + SOC_ENUM("ADCA RIN5 Source", ak5702_enum[13]),
> + SOC_ENUM("ADCB LIN5 Source", ak5702_enum[14]),
> + SOC_ENUM("ADCB RIN5 Source", ak5702_enum[15]),
> +
> + SOC_ENUM("MIC-A Power", ak5702_enum[16]),
> + SOC_ENUM("MIC-B Power", ak5702_enum[17]),
> +};
> +
> +/* ak5702 dapm widgets */
> +static const struct snd_soc_dapm_widget ak5702_dapm_widgets[] = {
> + SND_SOC_DAPM_ADC("ADCA Left", "Capture", AK5702_PM1, 0, 0),
> + SND_SOC_DAPM_ADC("ADCA Right", "Capture", AK5702_PM1, 1, 0),
> + SND_SOC_DAPM_ADC("ADCB Left", "Capture", AK5702_PM2, 0, 0),
> + SND_SOC_DAPM_ADC("ADCB Right", "Capture", AK5702_PM2, 1, 0),
> +
> + SND_SOC_DAPM_INPUT("ADCA Left Input"),
> + SND_SOC_DAPM_INPUT("ADCA Right Input"),
> + SND_SOC_DAPM_INPUT("ADCB Left Input"),
> + SND_SOC_DAPM_INPUT("ADCB Right Input"),
> +};
> +
> +static const struct snd_soc_dapm_route audio_map[] = {
I'd call this ak5702_dapm_routes
> + {"ADCA Left", NULL, "ADCA Left Input"},
> + {"ADCA Right", NULL, "ADCA Right Input"},
> + {"ADCB Left", NULL, "ADCB Left Input"},
> + {"ADCB Right", NULL, "ADCB Right Input"},
> +};
> +
> +static int ak5702_dai_startup(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + pr_debug("Entered %s\n", __func__);
> + return 0;
> +}
> +
> +static void ak5702_dai_shutdown(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + pr_debug("Entered %s\n", __func__);
> +}
No need to implement these, if they do nothing.
[...]
> +static int ak5702_dai_hw_free(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct snd_soc_codec *codec = dai->codec;
> + int value;
> +
> + pr_debug("Entered %s\n", __func__);
> + /* power down ADCA */
> + value = AK5702_POWERDOWN | AK5702_PM1_PMVCM;
> + ak5702_write(codec, AK5702_PM1, value);
> +
> + /* power down ADCB */
> + value = AK5702_POWERDOWN;
> + ak5702_write(codec, AK5702_PM2, value);
This looks all like power management, this should either be handeld by DAPM
controls directly or via the set_bias_level callback
> + return 0;
> +}
> +
> +static int ak5702_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 ak5702_priv *ak5702 = snd_soc_codec_get_drvdata(codec);
> + int value = 0;
> + switch (clk_id) {
> + case PLL_master_mode:
> + case EXT_master_mode:
please all upper case for the defines. Also they need a driver specific
prefix. Also slave and master mode should be selected via the set_dai_fmt
callback.
> + if (dir != SND_SOC_CLOCK_OUT)
> + return -EINVAL;
> + break;
> + case PLL_slave_mode:
> + case PLL_slave_mode2:
> + if (dir != SND_SOC_CLOCK_IN)
> + return -EINVAL;
> + value = AK5702_PLL1_POWERUP |
> + AK5702_PLL1_SLAVE |
> + AK5702_PLL1_MODE2;
> + break;
> + case EXT_slave_mode:
> + if (dir != SND_SOC_CLOCK_IN)
> + return -EINVAL;
> + value = AK5702_PLL1_POWERDOWN | AK5702_PLL1_SLAVE;
> + break;
> + default:
> + return -EINVAL;
> + }
> + ak5702_write(codec, AK5702_PLL1, value);
> + ak5702->clock_mode = clk_id;
> +
> + return 0;
> +}
> +
[...]
> +}
> +
> +#ifdef CONFIG_PM
> +static int ak5702_sync(struct snd_soc_codec *codec)
> +{
> + u16 *cache = codec->reg_cache;
> + int i, r = 0;
> +
> + for (i = 0; i < AK5702_CACHEREGNUM; i++)
> + r |= ak5702_write(codec, i, cache[i]);
> +
> + return r;
> +}
> +
> +static int ak5702_suspend(struct snd_soc_codec *codec)
> +{
> + return 0;
> +}
> +
> +static int ak5702_resume(struct snd_soc_codec *codec)
> +{
> + /* restore register status*/
> + return ak5702_sync(codec);
> +}
> +#endif
> +
> +/* define operations */
> +struct snd_soc_dai_ops ak5702_ops = {
static const
> + .set_sysclk = ak5702_set_dai_sysclk,
> + .set_pll = ak5702_set_dai_pll,
> + .set_clkdiv = ak5702_set_dai_clkdiv,
> + .set_fmt = ak5702_set_dai_fmt,
> + .startup = ak5702_dai_startup,
> + .shutdown = ak5702_dai_shutdown,
> + .hw_params = ak5702_dai_hw_params,
> + .hw_free = ak5702_dai_hw_free,
> +};
> +
> +/* define name and capabilities */
> +struct snd_soc_dai_driver ak5702_dai = {
static
> + .name = "ak5702-hifi",
> + .capture = {
> + .stream_name = "Capture",
> + .channels_min = 1,
> + .channels_max = 8,
> + .rates = SNDRV_PCM_RATE_8000_48000,
> + .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
> + },
> + .ops = &ak5702_ops,
> +};
> +
> +static struct snd_soc_codec *ak5702_codec;
Just move the definition of ak5702_codec here.
> +
> +static int ak5702_probe(struct snd_soc_codec *codec)
> +{
> + struct ak5702_priv *ak5702 = snd_soc_codec_get_drvdata(codec);
> + int ret = 0;
> + u8 reg = 0;
> + dev_info(codec->dev, "AK5702 Audio Codec %s", AK5702_VERSION);
> +
> + codec->hw_write = (hw_write_t)i2c_master_send;
> + codec->control_data = ak5702->control_data;
> +
> + /* set the clock type */
> + ak5702->clock_mode = EXT_slave_mode;
> +
> + /* power off the device */
> + reg = AK5702_POWERDOWN;
> + ak5702_write(codec, AK5702_PM1, reg);
> +
> + /* set default ADCA input LIN5-RIN5, power down ADCA mic power*/
> + reg = AK5702_SIG1_L_LIN5 | AK5702_SIG1_R_RIN5;
> + ak5702_write(codec, AK5702_SIG1, reg);
> +
> + /* mic gain +0dB */
> + reg = AK5702_MICGAIN_0DB;
> + ak5702_write(codec, AK5702_MICG1, reg);
> +
> + /* volume control dependent for ADCA */
> + reg = AK5702_VOLCTRL_DEP;
> + ak5702_write(codec, AK5702_VOLCTRL1, reg);
> +
> + /* set default volume for ADCA */
> + reg = AK5702_VOL_INIT;
> + ak5702_write(codec, AK5702_LVOL1, reg);
> +
> + /* power down ADCB */
> + reg = AK5702_POWERDOWN;
> + ak5702_write(codec, AK5702_PM2, reg);
> +
> + /* set default ADCB input LIN3-RIN3, power off ADCB mic power*/
> + reg = AK5702_SIG2_L_LIN3 | AK5702_SIG2_R_RIN3;
> + ak5702_write(codec, AK5702_SIG2, reg);
> +
> + /* mic gain +0dB */
> + reg = AK5702_MICGAIN_0DB;
> + ak5702_write(codec, AK5702_MICG2, reg);
> +
> + /* volume control independent for ADCB */
> + reg = AK5702_VOLCTRL_INDEP;
> + ak5702_write(codec, AK5702_VOLCTRL2, reg);
> +
> + /* set default volume for ADCB */
> + reg = AK5702_VOL_INIT;
> + ak5702_write(codec, AK5702_LVOL2, reg);
> + ak5702_write(codec, AK5702_RVOL2, reg);
There should be no need initialize all these registers, just leave them at
their reset default value and let userspace select whatever they need for
their mode of operation.
> +
> + snd_soc_add_codec_controls(codec, ak5702_snd_controls,
> + ARRAY_SIZE(ak5702_snd_controls));
Use the .controls/.num_controls field of the snd_soc_codec_driver struct to
get them registered instead of doing this here manually. Same goes for your
DAPM widgets and routes, which you don't seem to register at all at the moment.
> +
> + /* add debugfs entry */
> + ak5702_debug_add(ak5702);
> +
> + return ret;
> +}
> +
> +static int ak5702_remove(struct snd_soc_codec *codec)
> +{
> + struct ak5702_priv *ak5702 = snd_soc_codec_get_drvdata(codec);
> + u8 reg = 0;
> +
> + /* power off the device */
> + reg = AK5702_POWERDOWN;
> + ak5702_write(codec, AK5702_PM1, reg);
> + ak5702_debug_remove(ak5702);
> +
> + return 0;
> +}
> +
> +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
> +static __devinit int ak5702_i2c_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct ak5702_priv *ak5702;
> + int ret;
> + pr_debug("Entered %s", __func__);
> + if (ak5702_codec) { /*maybe useless*/
> + dev_err(&i2c->dev,
> + "Multiple AK5702 devices not supported\n");
> + return -ENOMEM;
> + }
> +
> + ak5702 = kzalloc(sizeof(struct ak5702_priv), GFP_KERNEL);
devm_kzalloc. Using devm_kzalloc means the memory will automatically be
freed when the device is removed, so you don't have to do this by hand.
> + if (!ak5702)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, ak5702);
> + ak5702->control_data = i2c;
> + ak5702->control_type = SND_SOC_I2C;
> +
> + ret = snd_soc_register_codec(&i2c->dev,
> + &soc_codec_dev_ak5702, &ak5702_dai, 1);
> + if (ret < 0) {
> + kfree(ak5702);
> + return ret;
> + }
> + return ret;
> +}
> +
> +static __devexit int ak5702_i2c_remove(struct i2c_client *client)
> +{
> + snd_soc_unregister_codec(&client->dev);
> + kfree(i2c_get_clientdata(client));
> + return 0;
> +}
> +
> +static const struct i2c_device_id ak5702_i2c_id[] = {
> + {"ak5702-codec", 0},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, ak5702_i2c_id);
> +
> +static struct i2c_driver ak5702_i2c_driver = {
> + .driver = {
> + .name = "ak5702-codec",
> + .owner = THIS_MODULE,
> + },
> + .probe = ak5702_i2c_probe,
> + .remove = __devexit_p(ak5702_i2c_remove),
> + .id_table = ak5702_i2c_id,
> +};
> +#endif
> +
> +struct snd_soc_codec_driver soc_codec_dev_ak5702 = {
static
> + .probe = ak5702_probe,
> + .remove = ak5702_remove,
> +#ifdef CONFIG_PM
> + .suspend = ak5702_suspend,
> + .resume = ak5702_resume,
> +#endif
> + .read = ak5702_read_reg_cache,
> + .write = ak5702_write,
> + .reg_cache_size = ARRAY_SIZE(ak5702_reg) ,
> + .reg_word_size = sizeof(u16),
> + .reg_cache_default = ak5702_reg,
> +};
> +
> +static int __init ak5702_modinit(void)
> +{
> + int ret = 0;
> +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
So if CONFIG_I2C is not selected the module does nothing?
> + ret = i2c_add_driver(&ak5702_i2c_driver);
> +#endif
> + return ret;
> +}
> +module_init(ak5702_modinit);
> +
> +static void __exit ak5702_exit(void)
> +{
> +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
> + i2c_del_driver(&ak5702_i2c_driver);
> +#endif
> +}
> +module_exit(ak5702_exit);
The hole module init/exit functions can just be replaced with
module_i2c_driver(ak5702_i2c_driver);
> +
> +MODULE_DESCRIPTION("Asahi Kasei AK5702 ALSA SoC driver");
> +MODULE_AUTHOR("Paolo Doz <paolo.doz at gmail.com");
> +MODULE_LICENSE("GPL");
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