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/*
* MAX9768 AMP driver
*
* Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
*
* 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; version 2 of the License.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/max9768.h>
/* "Registers" */
#define MAX9768_VOL 0
#define MAX9768_CTRL 3
/* Commands */
#define MAX9768_CTRL_PWM 0x15
#define MAX9768_CTRL_FILTERLESS 0x16
struct max9768 {
struct regmap *regmap;
int mute_gpio;
int shdn_gpio;
u32 flags;
};
static struct reg_default max9768_default_regs[] = {
{ 0, 0 },
{ 3, MAX9768_CTRL_FILTERLESS},
};
static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
int val = gpio_get_value_cansleep(max9768->mute_gpio);
ucontrol->value.integer.value[0] = !val;
return 0;
}
static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]);
return 0;
}
static const unsigned int volume_tlv[] = {
TLV_DB_RANGE_HEAD(43),
0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
63, 63, TLV_DB_SCALE_ITEM(950, 0, 0),
};
static const struct snd_kcontrol_new max9768_volume[] = {
SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
};
static const struct snd_kcontrol_new max9768_mute[] = {
SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
};
static int max9768_probe(struct snd_soc_codec *codec)
{
struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
int ret;
codec->control_data = max9768->regmap;
ret = snd_soc_codec_set_cache_io(codec, 2, 6, SND_SOC_REGMAP);
if (ret)
return ret;
if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
if (ret)
return ret;
}
if (gpio_is_valid(max9768->mute_gpio)) {
ret = snd_soc_add_codec_controls(codec, max9768_mute,
ARRAY_SIZE(max9768_mute));
if (ret)
return ret;
}
return 0;
}
static struct snd_soc_codec_driver max9768_codec_driver = {
.probe = max9768_probe,
.controls = max9768_volume,
.num_controls = ARRAY_SIZE(max9768_volume),
};
static const struct regmap_config max9768_i2c_regmap_config = {
.reg_bits = 2,
.val_bits = 6,
.max_register = 3,
.reg_defaults = max9768_default_regs,
.num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
.cache_type = REGCACHE_RBTREE,
};
static int max9768_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max9768 *max9768;
struct max9768_pdata *pdata = client->dev.platform_data;
int err;
max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
if (!max9768)
return -ENOMEM;
if (pdata) {
/* Mute on powerup to avoid clicks */
err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
max9768->mute_gpio = err ?: pdata->mute_gpio;
/* Activate chip by releasing shutdown, enables I2C */
err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
max9768->shdn_gpio = err ?: pdata->shdn_gpio;
max9768->flags = pdata->flags;
} else {
max9768->shdn_gpio = -EINVAL;
max9768->mute_gpio = -EINVAL;
}
i2c_set_clientdata(client, max9768);
max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
if (IS_ERR(max9768->regmap)) {
err = PTR_ERR(max9768->regmap);
goto err_gpio_free;
}
err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
if (err)
goto err_gpio_free;
return 0;
err_gpio_free:
if (gpio_is_valid(max9768->shdn_gpio))
gpio_free(max9768->shdn_gpio);
if (gpio_is_valid(max9768->mute_gpio))
gpio_free(max9768->mute_gpio);
return err;
}
static int max9768_i2c_remove(struct i2c_client *client)
{
struct max9768 *max9768 = i2c_get_clientdata(client);
snd_soc_unregister_codec(&client->dev);
if (gpio_is_valid(max9768->shdn_gpio))
gpio_free(max9768->shdn_gpio);
if (gpio_is_valid(max9768->mute_gpio))
gpio_free(max9768->mute_gpio);
return 0;
}
static const struct i2c_device_id max9768_i2c_id[] = {
{ "max9768", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
static struct i2c_driver max9768_i2c_driver = {
.driver = {
.name = "max9768",
.owner = THIS_MODULE,
},
.probe = max9768_i2c_probe,
.remove = max9768_i2c_remove,
.id_table = max9768_i2c_id,
};
module_i2c_driver(max9768_i2c_driver);
MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
MODULE_LICENSE("GPL v2");
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