linux/sound/soc/codecs/tpa6130a2.c

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/*
* ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
*
* Copyright (C) Nokia Corporation
*
* Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
*
* 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 program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <sound/tpa6130a2-plat.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/tlv.h>
#include "tpa6130a2.h"
static struct i2c_client *tpa6130a2_client;
/* This struct is used to save the context */
struct tpa6130a2_data {
struct mutex mutex;
unsigned char regs[TPA6130A2_CACHEREGNUM];
int power_gpio;
unsigned char power_state;
};
static int tpa6130a2_i2c_read(int reg)
{
struct tpa6130a2_data *data;
int val;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
/* If powered off, return the cached value */
if (data->power_state) {
val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
if (val < 0)
dev_err(&tpa6130a2_client->dev, "Read failed\n");
else
data->regs[reg] = val;
} else {
val = data->regs[reg];
}
return val;
}
static int tpa6130a2_i2c_write(int reg, u8 value)
{
struct tpa6130a2_data *data;
int val = 0;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
if (data->power_state) {
val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
if (val < 0)
dev_err(&tpa6130a2_client->dev, "Write failed\n");
}
/* Either powered on or off, we save the context */
data->regs[reg] = value;
return val;
}
static u8 tpa6130a2_read(int reg)
{
struct tpa6130a2_data *data;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
return data->regs[reg];
}
static void tpa6130a2_initialize(void)
{
struct tpa6130a2_data *data;
int i;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
for (i = 1; i < TPA6130A2_REG_VERSION; i++)
tpa6130a2_i2c_write(i, data->regs[i]);
}
static void tpa6130a2_power(int power)
{
struct tpa6130a2_data *data;
u8 val;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
mutex_lock(&data->mutex);
if (power) {
/* Power on */
if (data->power_gpio >= 0) {
gpio_set_value(data->power_gpio, 1);
data->power_state = 1;
tpa6130a2_initialize();
}
/* Clear SWS */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val &= ~TPA6130A2_SWS;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
} else {
/* set SWS */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val |= TPA6130A2_SWS;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
/* Power off */
if (data->power_gpio >= 0) {
gpio_set_value(data->power_gpio, 0);
data->power_state = 0;
}
}
mutex_unlock(&data->mutex);
}
static int tpa6130a2_get_reg(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct soc_mixer_control *mc =
(struct soc_mixer_control *)kcontrol->private_value;
struct tpa6130a2_data *data;
unsigned int reg = mc->reg;
unsigned int shift = mc->shift;
unsigned int mask = mc->max;
unsigned int invert = mc->invert;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
mutex_lock(&data->mutex);
ucontrol->value.integer.value[0] =
(tpa6130a2_read(reg) >> shift) & mask;
if (invert)
ucontrol->value.integer.value[0] =
mask - ucontrol->value.integer.value[0];
mutex_unlock(&data->mutex);
return 0;
}
static int tpa6130a2_set_reg(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct soc_mixer_control *mc =
(struct soc_mixer_control *)kcontrol->private_value;
struct tpa6130a2_data *data;
unsigned int reg = mc->reg;
unsigned int shift = mc->shift;
unsigned int mask = mc->max;
unsigned int invert = mc->invert;
unsigned int val = (ucontrol->value.integer.value[0] & mask);
unsigned int val_reg;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
if (invert)
val = mask - val;
mutex_lock(&data->mutex);
val_reg = tpa6130a2_read(reg);
if (((val_reg >> shift) & mask) == val) {
mutex_unlock(&data->mutex);
return 0;
}
val_reg &= ~(mask << shift);
val_reg |= val << shift;
tpa6130a2_i2c_write(reg, val_reg);
mutex_unlock(&data->mutex);
return 1;
}
/*
* TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
* down in gain.
*/
static const unsigned int tpa6130_tlv[] = {
TLV_DB_RANGE_HEAD(10),
0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
};
static const struct snd_kcontrol_new tpa6130a2_controls[] = {
SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
tpa6130a2_get_reg, tpa6130a2_set_reg,
tpa6130_tlv),
};
/*
* Enable or disable channel (left or right)
* The bit number for mute and amplifier are the same per channel:
* bit 6: Right channel
* bit 7: Left channel
* in both registers.
*/
static void tpa6130a2_channel_enable(u8 channel, int enable)
{
struct tpa6130a2_data *data;
u8 val;
BUG_ON(tpa6130a2_client == NULL);
data = i2c_get_clientdata(tpa6130a2_client);
if (enable) {
/* Enable channel */
/* Enable amplifier */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val |= channel;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
/* Unmute channel */
val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
val &= ~channel;
tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
} else {
/* Disable channel */
/* Mute channel */
val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
val |= channel;
tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
/* Disable amplifier */
val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
val &= ~channel;
tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
}
}
static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
switch (event) {
case SND_SOC_DAPM_POST_PMU:
tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1);
break;
case SND_SOC_DAPM_POST_PMD:
tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0);
break;
}
return 0;
}
static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
switch (event) {
case SND_SOC_DAPM_POST_PMU:
tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1);
break;
case SND_SOC_DAPM_POST_PMD:
tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0);
break;
}
return 0;
}
static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
switch (event) {
case SND_SOC_DAPM_POST_PMU:
tpa6130a2_power(1);
break;
case SND_SOC_DAPM_POST_PMD:
tpa6130a2_power(0);
break;
}
return 0;
}
static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM,
0, 0, NULL, 0, tpa6130a2_left_event,
SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM,
0, 0, NULL, 0, tpa6130a2_right_event,
SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM,
0, 0, tpa6130a2_supply_event,
SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
/* Outputs */
SND_SOC_DAPM_HP("TPA6130A2 Headphone Left", NULL),
SND_SOC_DAPM_HP("TPA6130A2 Headphone Right", NULL),
};
static const struct snd_soc_dapm_route audio_map[] = {
{"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"},
{"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"},
{"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"},
{"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"},
};
int tpa6130a2_add_controls(struct snd_soc_codec *codec)
{
snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets,
ARRAY_SIZE(tpa6130a2_dapm_widgets));
snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
return snd_soc_add_controls(codec, tpa6130a2_controls,
ARRAY_SIZE(tpa6130a2_controls));
}
EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
static int tpa6130a2_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev;
struct tpa6130a2_data *data;
struct tpa6130a2_platform_data *pdata;
int ret;
dev = &client->dev;
if (client->dev.platform_data == NULL) {
dev_err(dev, "Platform data not set\n");
dump_stack();
return -ENODEV;
}
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL) {
dev_err(dev, "Can not allocate memory\n");
return -ENOMEM;
}
tpa6130a2_client = client;
i2c_set_clientdata(tpa6130a2_client, data);
pdata = client->dev.platform_data;
data->power_gpio = pdata->power_gpio;
mutex_init(&data->mutex);
/* Set default register values */
data->regs[TPA6130A2_REG_CONTROL] = TPA6130A2_SWS;
data->regs[TPA6130A2_REG_VOL_MUTE] = TPA6130A2_MUTE_R |
TPA6130A2_MUTE_L;
if (data->power_gpio >= 0) {
ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
if (ret < 0) {
dev_err(dev, "Failed to request power GPIO (%d)\n",
data->power_gpio);
goto fail;
}
gpio_direction_output(data->power_gpio, 0);
} else {
data->power_state = 1;
tpa6130a2_initialize();
}
tpa6130a2_power(1);
/* Read version */
ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
TPA6130A2_VERSION_MASK;
if ((ret != 1) && (ret != 2))
dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
/* Disable the chip */
tpa6130a2_power(0);
return 0;
fail:
kfree(data);
i2c_set_clientdata(tpa6130a2_client, NULL);
tpa6130a2_client = NULL;
return ret;
}
static int tpa6130a2_remove(struct i2c_client *client)
{
struct tpa6130a2_data *data = i2c_get_clientdata(client);
tpa6130a2_power(0);
if (data->power_gpio >= 0)
gpio_free(data->power_gpio);
kfree(data);
tpa6130a2_client = NULL;
return 0;
}
static const struct i2c_device_id tpa6130a2_id[] = {
{ "tpa6130a2", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
static struct i2c_driver tpa6130a2_i2c_driver = {
.driver = {
.name = "tpa6130a2",
.owner = THIS_MODULE,
},
.probe = tpa6130a2_probe,
.remove = __devexit_p(tpa6130a2_remove),
.id_table = tpa6130a2_id,
};
static int __init tpa6130a2_init(void)
{
return i2c_add_driver(&tpa6130a2_i2c_driver);
}
static void __exit tpa6130a2_exit(void)
{
i2c_del_driver(&tpa6130a2_i2c_driver);
}
MODULE_AUTHOR("Peter Ujfalusi");
MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
MODULE_LICENSE("GPL");
module_init(tpa6130a2_init);
module_exit(tpa6130a2_exit);