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linux/sound/soc/codecs/ak4642.c
Kuninori Morimoto 1cf86f6f9b ASoC: ak4642: Add default return value in ak4642_modinit 
If ak4642 driver was compiled without I2C configs,
ak4642_modinit return value will become un-stable.
This patch modify this bug

Reported-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-12-15 14:54:01 +00:00

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/*
* ak4642.c -- AK4642/AK4643 ALSA Soc Audio driver
*
* Copyright (C) 2009 Renesas Solutions Corp.
* Kuninori Morimoto <morimoto.kuninori@renesas.com>
*
* 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.
*/
/* ** CAUTION **
*
* This is very simple driver.
* It can use headphone output / stereo input only
*
* AK4642 is not tested.
* AK4643 is tested.
*/
#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 "ak4642.h"
#define AK4642_VERSION "0.0.1"
#define PW_MGMT1 0x00
#define PW_MGMT2 0x01
#define SG_SL1 0x02
#define SG_SL2 0x03
#define MD_CTL1 0x04
#define MD_CTL2 0x05
#define TIMER 0x06
#define ALC_CTL1 0x07
#define ALC_CTL2 0x08
#define L_IVC 0x09
#define L_DVC 0x0a
#define ALC_CTL3 0x0b
#define R_IVC 0x0c
#define R_DVC 0x0d
#define MD_CTL3 0x0e
#define MD_CTL4 0x0f
#define PW_MGMT3 0x10
#define DF_S 0x11
#define FIL3_0 0x12
#define FIL3_1 0x13
#define FIL3_2 0x14
#define FIL3_3 0x15
#define EQ_0 0x16
#define EQ_1 0x17
#define EQ_2 0x18
#define EQ_3 0x19
#define EQ_4 0x1a
#define EQ_5 0x1b
#define FIL1_0 0x1c
#define FIL1_1 0x1d
#define FIL1_2 0x1e
#define FIL1_3 0x1f
#define PW_MGMT4 0x20
#define MD_CTL5 0x21
#define LO_MS 0x22
#define HP_MS 0x23
#define SPK_MS 0x24
#define AK4642_CACHEREGNUM 0x25
struct snd_soc_codec_device soc_codec_dev_ak4642;
/* codec private data */
struct ak4642_priv {
struct snd_soc_codec codec;
unsigned int sysclk;
};
static struct snd_soc_codec *ak4642_codec;
/*
* ak4642 register cache
*/
static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
0x0000, 0x0000, 0x0001, 0x0000,
0x0002, 0x0000, 0x0000, 0x0000,
0x00e1, 0x00e1, 0x0018, 0x0000,
0x00e1, 0x0018, 0x0011, 0x0008,
0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000,
0x0000,
};
/*
* read ak4642 register cache
*/
static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
unsigned int reg)
{
u16 *cache = codec->reg_cache;
if (reg >= AK4642_CACHEREGNUM)
return -1;
return cache[reg];
}
/*
* write ak4642 register cache
*/
static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
u16 reg, unsigned int value)
{
u16 *cache = codec->reg_cache;
if (reg >= AK4642_CACHEREGNUM)
return;
cache[reg] = value;
}
/*
* write to the AK4642 register space
*/
static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
u8 data[2];
/* data is
* D15..D8 AK4642 register offset
* D7...D0 register data
*/
data[0] = reg & 0xff;
data[1] = value & 0xff;
if (codec->hw_write(codec->control_data, data, 2) == 2) {
ak4642_write_reg_cache(codec, reg, value);
return 0;
} else
return -EIO;
}
static int ak4642_sync(struct snd_soc_codec *codec)
{
u16 *cache = codec->reg_cache;
int i, r = 0;
for (i = 0; i < AK4642_CACHEREGNUM; i++)
r |= ak4642_write(codec, i, cache[i]);
return r;
};
static int ak4642_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
struct snd_soc_codec *codec = dai->codec;
if (is_play) {
/*
* start headphone output
*
* PLL, Master Mode
* Audio I/F Format :MSB justified (ADC & DAC)
* Sampling Frequency: 44.1kHz
* Digital Volume: −8dB
* Bass Boost Level : Middle
*
* This operation came from example code of
* "ASAHI KASEI AK4642" (japanese) manual p97.
*
* Example code use 0x39, 0x79 value for 0x01 address,
* But we need MCKO (0x02) bit now
*/
ak4642_write(codec, 0x05, 0x27);
ak4642_write(codec, 0x0f, 0x09);
ak4642_write(codec, 0x0e, 0x19);
ak4642_write(codec, 0x09, 0x91);
ak4642_write(codec, 0x0c, 0x91);
ak4642_write(codec, 0x0a, 0x28);
ak4642_write(codec, 0x0d, 0x28);
ak4642_write(codec, 0x00, 0x64);
ak4642_write(codec, 0x01, 0x3b); /* + MCKO bit */
ak4642_write(codec, 0x01, 0x7b); /* + MCKO bit */
} else {
/*
* start stereo input
*
* PLL Master Mode
* Audio I/F Format:MSB justified (ADC & DAC)
* Sampling Frequency:44.1kHz
* Pre MIC AMP:+20dB
* MIC Power On
* ALC setting:Refer to Table 35
* ALC bit=“1”
*
* This operation came from example code of
* "ASAHI KASEI AK4642" (japanese) manual p94.
*/
ak4642_write(codec, 0x05, 0x27);
ak4642_write(codec, 0x02, 0x05);
ak4642_write(codec, 0x06, 0x3c);
ak4642_write(codec, 0x08, 0xe1);
ak4642_write(codec, 0x0b, 0x00);
ak4642_write(codec, 0x07, 0x21);
ak4642_write(codec, 0x00, 0x41);
ak4642_write(codec, 0x10, 0x01);
}
return 0;
}
static void ak4642_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
struct snd_soc_codec *codec = dai->codec;
if (is_play) {
/* stop headphone output */
ak4642_write(codec, 0x01, 0x3b);
ak4642_write(codec, 0x01, 0x0b);
ak4642_write(codec, 0x00, 0x40);
ak4642_write(codec, 0x0e, 0x11);
ak4642_write(codec, 0x0f, 0x08);
} else {
/* stop stereo input */
ak4642_write(codec, 0x00, 0x40);
ak4642_write(codec, 0x10, 0x00);
ak4642_write(codec, 0x07, 0x01);
}
}
static int ak4642_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 ak4642_priv *ak4642 = codec->private_data;
ak4642->sysclk = freq;
return 0;
}
static struct snd_soc_dai_ops ak4642_dai_ops = {
.startup = ak4642_dai_startup,
.shutdown = ak4642_dai_shutdown,
.set_sysclk = ak4642_dai_set_sysclk,
};
struct snd_soc_dai ak4642_dai = {
.name = "AK4642",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE },
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE },
.ops = &ak4642_dai_ops,
};
EXPORT_SYMBOL_GPL(ak4642_dai);
static int ak4642_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
ak4642_sync(codec);
return 0;
}
/*
* initialise the AK4642 driver
* register the mixer and dsp interfaces with the kernel
*/
static int ak4642_init(struct ak4642_priv *ak4642)
{
struct snd_soc_codec *codec = &ak4642->codec;
int ret = 0;
if (ak4642_codec) {
dev_err(codec->dev, "Another ak4642 is registered\n");
return -EINVAL;
}
mutex_init(&codec->mutex);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
codec->private_data = ak4642;
codec->name = "AK4642";
codec->owner = THIS_MODULE;
codec->read = ak4642_read_reg_cache;
codec->write = ak4642_write;
codec->dai = &ak4642_dai;
codec->num_dai = 1;
codec->hw_write = (hw_write_t)i2c_master_send;
codec->reg_cache_size = ARRAY_SIZE(ak4642_reg);
codec->reg_cache = kmemdup(ak4642_reg,
sizeof(ak4642_reg), GFP_KERNEL);
if (!codec->reg_cache)
return -ENOMEM;
ak4642_dai.dev = codec->dev;
ak4642_codec = codec;
ret = snd_soc_register_codec(codec);
if (ret) {
dev_err(codec->dev, "Failed to register codec: %d\n", ret);
goto reg_cache_err;
}
ret = snd_soc_register_dai(&ak4642_dai);
if (ret) {
dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
snd_soc_unregister_codec(codec);
goto reg_cache_err;
}
/*
* clock setting
*
* Audio I/F Format: MSB justified (ADC & DAC)
* BICK frequency at Master Mode: 64fs
* Input Master Clock Select at PLL Mode: 11.2896MHz
* MCKO: Enable
* Sampling Frequency: 44.1kHz
*
* This operation came from example code of
* "ASAHI KASEI AK4642" (japanese) manual p89.
*
* please fix-me
*/
ak4642_write(codec, 0x01, 0x08);
ak4642_write(codec, 0x04, 0x4a);
ak4642_write(codec, 0x05, 0x27);
ak4642_write(codec, 0x00, 0x40);
ak4642_write(codec, 0x01, 0x0b);
return ret;
reg_cache_err:
kfree(codec->reg_cache);
codec->reg_cache = NULL;
return ret;
}
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int ak4642_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct ak4642_priv *ak4642;
struct snd_soc_codec *codec;
int ret;
ak4642 = kzalloc(sizeof(struct ak4642_priv), GFP_KERNEL);
if (!ak4642)
return -ENOMEM;
codec = &ak4642->codec;
codec->dev = &i2c->dev;
i2c_set_clientdata(i2c, ak4642);
codec->control_data = i2c;
ret = ak4642_init(ak4642);
if (ret < 0)
printk(KERN_ERR "failed to initialise AK4642\n");
return ret;
}
static int ak4642_i2c_remove(struct i2c_client *client)
{
struct ak4642_priv *ak4642 = i2c_get_clientdata(client);
snd_soc_unregister_dai(&ak4642_dai);
snd_soc_unregister_codec(&ak4642->codec);
kfree(ak4642->codec.reg_cache);
kfree(ak4642);
ak4642_codec = NULL;
return 0;
}
static const struct i2c_device_id ak4642_i2c_id[] = {
{ "ak4642", 0 },
{ "ak4643", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ak4642_i2c_id);
static struct i2c_driver ak4642_i2c_driver = {
.driver = {
.name = "AK4642 I2C Codec",
.owner = THIS_MODULE,
},
.probe = ak4642_i2c_probe,
.remove = ak4642_i2c_remove,
.id_table = ak4642_i2c_id,
};
#endif
static int ak4642_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
int ret;
if (!ak4642_codec) {
dev_err(&pdev->dev, "Codec device not registered\n");
return -ENODEV;
}
socdev->card->codec = ak4642_codec;
/* register pcms */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0) {
printk(KERN_ERR "ak4642: failed to create pcms\n");
goto pcm_err;
}
dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
return ret;
pcm_err:
return ret;
}
/* power down chip */
static int ak4642_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);
return 0;
}
struct snd_soc_codec_device soc_codec_dev_ak4642 = {
.probe = ak4642_probe,
.remove = ak4642_remove,
.resume = ak4642_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ak4642);
static int __init ak4642_modinit(void)
{
int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
ret = i2c_add_driver(&ak4642_i2c_driver);
#endif
return ret;
}
module_init(ak4642_modinit);
static void __exit ak4642_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_del_driver(&ak4642_i2c_driver);
#endif
}
module_exit(ak4642_exit);
MODULE_DESCRIPTION("Soc AK4642 driver");
MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
MODULE_LICENSE("GPL");
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