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Commit 394d2bba authored by Wolfram Sang's avatar Wolfram Sang Committed by Mark Brown
Browse files

ASoC: max9768: add driver for max9768 amplifier 



Add a driver supporting the volume control and the mute pin. Shdn pin
and DAPM are not taken care of yet.

Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent ffa8d9df

include/sound/max9768.h

0 → 100644
+24 −0
Original line number Diff line number Diff line 
/*

 * Platform data for MAX9768

 * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.

 * same licence as the driver

 */



#ifndef __SOUND_MAX9768_PDATA_H__

#define __SOUND_MAX9768_PDATA_H__



/**

 * struct max9768_pdata - optional platform specific MAX9768 configuration

 * @shdn_gpio:	GPIO to SHDN pin. If not valid, pin must be hardwired HIGH

 * @mute_gpio:	GPIO to MUTE pin. If not valid, control for mute won't be added

 * @flags: configuration flags, e.g. set classic PWM mode (check datasheet

 *         regarding "filterless modulation" which is default).

 */

struct max9768_pdata {

	int shdn_gpio;

	int mute_gpio;

	unsigned flags;

#define MAX9768_FLAG_CLASSIC_PWM	(1 << 0)

};



#endif /* __SOUND_MAX9768_PDATA_H__*/

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_MAX98088 if I2C

	select SND_SOC_MAX98095 if I2C

	select SND_SOC_MAX9850 if I2C

	select SND_SOC_MAX9768 if I2C

	select SND_SOC_MAX9877 if I2C

	select SND_SOC_PCM3008

	select SND_SOC_RT5631 if I2C
@@ -429,6 +430,9 @@ config SND_SOC_WM9713 
config SND_SOC_LM4857

	tristate



config SND_SOC_MAX9768

	tristate



config SND_SOC_MAX9877

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ snd-soc-dmic-objs := dmic.o 
snd-soc-jz4740-codec-objs := jz4740.o

snd-soc-l3-objs := l3.o

snd-soc-lm4857-objs := lm4857.o

snd-soc-max9768-objs := max9768.o

snd-soc-max98088-objs := max98088.o

snd-soc-max98095-objs := max98095.o

snd-soc-max9850-objs := max9850.o
@@ -130,6 +131,7 @@ obj-$(CONFIG_SND_SOC_DMIC) += snd-soc-dmic.o 
obj-$(CONFIG_SND_SOC_L3)	+= snd-soc-l3.o

obj-$(CONFIG_SND_SOC_LM4857)	+= snd-soc-lm4857.o

obj-$(CONFIG_SND_SOC_JZ4740_CODEC)	+= snd-soc-jz4740-codec.o

obj-$(CONFIG_SND_SOC_MAX9768)	+= snd-soc-max9768.o

obj-$(CONFIG_SND_SOC_MAX98088)	+= snd-soc-max98088.o

obj-$(CONFIG_SND_SOC_MAX98095)	+= snd-soc-max98095.o

obj-$(CONFIG_SND_SOC_MAX9850)	+= snd-soc-max9850.o

sound/soc/codecs/max9768.c

0 → 100644
+253 −0
Original line number Diff line number Diff line 
/*

 * 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("Mute 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_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 bool max9768_always_false(struct device *dev, unsigned int reg)

{

	return false;

}



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),

	.volatile_reg = max9768_always_false,

	.cache_type = REGCACHE_RBTREE,

};



static int __devinit 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 = 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_regmap_free;



	return 0;



 err_regmap_free:

	regmap_exit(max9768->regmap);

 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 __devexit max9768_i2c_remove(struct i2c_client *client)

{

	struct max9768 *max9768 = i2c_get_clientdata(client);



	snd_soc_unregister_codec(&client->dev);

	regmap_exit(max9768->regmap);



	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 = __devexit_p(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");