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/*
* LM4857 AMP driver
*
* Copyright 2007 Wolfson Microelectronics PLC.
* Author: Graeme Gregory
* graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
*
* 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/module.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include "lm4857.h"
static struct {
struct i2c_client *i2c;
uint8_t regs[4];
uint8_t state;
} lm4857 = {
.regs = {0x00, 0x40, 0x80, 0xC0},
};
static void lm4857_write_regs(void)
{
if (!lm4857.i2c)
return;
if (i2c_master_send(lm4857.i2c, lm4857.regs, 4) != 4)
dev_err(&lm4857_i2c->dev, "lm4857: i2c write failed\n");
}
static int lm4857_get_reg(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct soc_mixer_control *mc =
(struct soc_mixer_control *)kcontrol->private_value;
int reg = mc->reg;
int shift = mc->shift;
int mask = mc->max;
ucontrol->value.integer.value[0] = (lm4857.regs[reg] >> shift) & mask;
return 0;
}
static int lm4857_set_reg(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct soc_mixer_control *mc =
(struct soc_mixer_control *)kcontrol->private_value;
int reg = mc->reg;
int shift = mc->shift;
int mask = mc->max;
if (((lm4857.regs[reg] >> shift) & mask) ==
ucontrol->value.integer.value[0])
return 0;
lm4857.regs[reg] &= ~(mask << shift);
lm4857.regs[reg] |= ucontrol->value.integer.value[0] << shift;
lm4857_write_regs();
return 1;
}
static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
uint8_t value = lm4857.regs[LM4857_CTRL] & 0x0F;
if (value)
value -= 5;
ucontrol->value.integer.value[0] = value;
return 0;
}
static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
uint8_t value = ucontrol->value.integer.value[0];
if (value)
value += 5;
if ((lm4857.regs[LM4857_CTRL] & 0x0F) == value)
return 0;
lm4857.regs[LM4857_CTRL] &= 0xF0;
lm4857.regs[LM4857_CTRL] |= value;
lm4857_write_regs();
return 1;
}
static const char *lm4857_mode[] = {
"Off",
"Call Speaker",
"Stereo Speakers",
"Stereo Speakers + Headphones",
"Headphones"
};
static const struct soc_enum lm4857_mode_enum[] = {
SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode),
};
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_EXT_TLV("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
lm4857_get_reg, lm4857_set_reg, stereo_tlv),
SOC_SINGLE_EXT_TLV("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
lm4857_get_reg, lm4857_set_reg, stereo_tlv),
SOC_SINGLE_EXT_TLV("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
lm4857_get_reg, lm4857_set_reg, mono_tlv),
SOC_ENUM_EXT("Amp Mode", lm4857_mode_enum[0],
lm4857_get_mode, lm4857_set_mode),
SOC_SINGLE_EXT("Amp Spk 3D Playback Switch", LM4857_LVOL, 5, 1, 0,
lm4857_get_reg, lm4857_set_reg),
SOC_SINGLE_EXT("Amp HP 3d Playback Switch", LM4857_RVOL, 5, 1, 0,
lm4857_get_reg, lm4857_set_reg),
SOC_SINGLE_EXT("Amp Fast Wakeup Playback Switch", LM4857_CTRL, 5, 1, 0,
lm4857_get_reg, lm4857_set_reg),
SOC_SINGLE_EXT("Amp Earpiece 6dB Playback Switch", LM4857_CTRL, 4, 1, 0,
lm4857_get_reg, lm4857_set_reg),
};
int lm4857_add_controls(struct snd_soc_codec *codec)
{
return snd_soc_add_controls(codec, lm4857_controls,
ARRAY_SIZE(lm5857_controls));
}
EXPORT_GPL(lm4857_add_controlls);
static int __devinit lm4857_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
lm4857.i2c = client;
lm4857_write_regs();
return 0;
}
static int __devexit lm4857_remove(struct i2c_client *client)
{
lm4857.i2c = NULL;
return 0;
}
static void lm4857_shutdown(struct i2c_client *client)
{
lm4857_regs[LM4857_CTRL] &= 0xf0;
lm4857_write_regs();
}
#ifdef CONFIG_PM
static int lm4857_suspend(struct i2c_client *client, pm_message_t state)
{
lm4857.state = lm4857_regs[LM4857_CTRL] & 0xf;
if (lm4857.state)
lm4857_shutdown(client);
return 0;
}
static int lm4857_resume(struct i2c_client *dev)
{
if (lm4857.state) {
lm4857_regs[LM4857_CTRL] |= (lm4857.state & 0x0f);
lm4857_write_regs();
}
return 0;
}
#else
#define lm4857_suspend NULL
#define lm4857_resume NULL
#endif
static const struct i2c_device_id lm4857_i2c_id[] = {
{ "lm4857", 0 },
{ }
};
static struct i2c_driver lm4857_i2c_driver = {
.driver = {
.name = "LM4857 I2C Amp",
.owner = THIS_MODULE,
},
.probe = lm4857_probe,
.remove = __devexit_p(lm4857_remove),
.suspend = lm4857_suspend,
.resume = lm4857_resume,
.shutdown = lm4857_shutdown,
.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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