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/*
* LM4857 AMP driver
*
* Copyright 2007 Wolfson Microelectronics PLC.
* Author: Graeme Gregory
* graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
* Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/tlv.h>
struct lm4857 {
struct i2c_client *i2c;
uint8_t mode;
};
static const uint8_t lm4857_default_regs[] = {
0x00, 0x00, 0x00, 0x00,
};
/* The register offsets in the cache array */
#define LM4857_MVOL 0
#define LM4857_LVOL 1
#define LM4857_RVOL 2
#define LM4857_CTRL 3
/* the shifts required to set these bits */
#define LM4857_3D 5
#define LM4857_WAKEUP 5
#define LM4857_EPGAIN 4
static int lm4857_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
uint8_t data;
int ret;
ret = snd_soc_cache_write(codec, reg, value);
if (ret < 0)
return ret;
data = (reg << 6) | value;
ret = i2c_master_send(codec->control_data, &data, 1);
if (ret != 1) {
dev_err(codec->dev, "Failed to write register: %d\n", ret);
return ret;
}
return 0;
}
static unsigned int lm4857_read(struct snd_soc_codec *codec,
unsigned int reg)
{
unsigned int val;
int ret;
ret = snd_soc_cache_read(codec, reg, &val);
if (ret)
return -1;
return val;
}
static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
ucontrol->value.integer.value[0] = lm4857->mode;
return 0;
}
static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
uint8_t value = ucontrol->value.integer.value[0];
lm4857->mode = value;
if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, value + 6);
return 1;
}
static int lm4857_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
switch (level) {
case SND_SOC_BIAS_ON:
snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, lm4857->mode + 6);
break;
case SND_SOC_BIAS_STANDBY:
snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, 0);
break;
default:
break;
}
codec->dapm.bias_level = level;
return 0;
}
static const char *lm4857_mode[] = {
"Earpiece",
"Loudspeaker",
"Loudspeaker + Headphone",
"Headphone",
};
static const struct soc_enum lm4857_mode_enum =
SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode);
static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("IN"),
SND_SOC_DAPM_OUTPUT("LS"),
SND_SOC_DAPM_OUTPUT("HP"),
SND_SOC_DAPM_OUTPUT("EP"),
};
static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
static const struct snd_kcontrol_new lm4857_controls[] = {
SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
stereo_tlv),
SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
stereo_tlv),
SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
mono_tlv),
SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
LM4857_WAKEUP, 1, 0),
SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
LM4857_EPGAIN, 1, 0),
SOC_ENUM_EXT("Mode", lm4857_mode_enum,
lm4857_get_mode, lm4857_set_mode),
};
/* There is a demux inbetween the the input signal and the output signals.
* Currently there is no easy way to model it in ASoC and since it does not make
* much of a difference in practice simply connect the input direclty to the
* outputs. */
static const struct snd_soc_dapm_route lm4857_routes[] = {
{"LS", NULL, "IN"},
{"HP", NULL, "IN"},
{"EP", NULL, "IN"},
};
static int lm4857_probe(struct snd_soc_codec *codec)
{
struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
struct snd_soc_dapm_context *dapm = &codec->dapm;
int ret;
codec->control_data = lm4857->i2c;
ret = snd_soc_add_controls(codec, lm4857_controls,
ARRAY_SIZE(lm4857_controls));
if (ret)
return ret;
ret = snd_soc_dapm_new_controls(dapm, lm4857_dapm_widgets,
ARRAY_SIZE(lm4857_dapm_widgets));
if (ret)
return ret;
ret = snd_soc_dapm_add_routes(dapm, lm4857_routes,
ARRAY_SIZE(lm4857_routes));
if (ret)
return ret;
snd_soc_dapm_new_widgets(dapm);
return 0;
}
static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
.write = lm4857_write,
.read = lm4857_read,
.probe = lm4857_probe,
.reg_cache_size = ARRAY_SIZE(lm4857_default_regs),
.reg_word_size = sizeof(uint8_t),
.reg_cache_default = lm4857_default_regs,
.set_bias_level = lm4857_set_bias_level,
};
static int __devinit lm4857_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct lm4857 *lm4857;
int ret;
lm4857 = kzalloc(sizeof(*lm4857), GFP_KERNEL);
if (!lm4857)
return -ENOMEM;
i2c_set_clientdata(i2c, lm4857);
lm4857->i2c = i2c;
ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
if (ret) {
kfree(lm4857);
return ret;
}
return 0;
}
static int __devexit lm4857_i2c_remove(struct i2c_client *i2c)
{
struct lm4857 *lm4857 = i2c_get_clientdata(i2c);
snd_soc_unregister_codec(&i2c->dev);
kfree(lm4857);
return 0;
}
static const struct i2c_device_id lm4857_i2c_id[] = {
{ "lm4857", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
static struct i2c_driver lm4857_i2c_driver = {
.driver = {
.name = "lm4857",
.owner = THIS_MODULE,
},
.probe = lm4857_i2c_probe,
.remove = __devexit_p(lm4857_i2c_remove),
.id_table = lm4857_i2c_id,
};
static int __init lm4857_init(void)
{
return i2c_add_driver(&lm4857_i2c_driver);
}
module_init(lm4857_init);
static void __exit lm4857_exit(void)
{
i2c_del_driver(&lm4857_i2c_driver);
}
module_exit(lm4857_exit);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("LM4857 amplifier driver");
MODULE_LICENSE("GPL");
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