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Commit 71cfc902 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Add WM8728 codec driver 



The WM8728 is a high performance stereo DAC designed for applications
such as DVD, home theatre and digital TV.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 2bef9010

sound/soc/codecs/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_UDA1380 if I2C

	select SND_SOC_WM8510 if (I2C || SPI_MASTER)

	select SND_SOC_WM8580 if I2C

	select SND_SOC_WM8728 if (I2C || SPI_MASTER)

	select SND_SOC_WM8731 if (I2C || SPI_MASTER)

	select SND_SOC_WM8750 if (I2C || SPI_MASTER)

	select SND_SOC_WM8753 if (I2C || SPI_MASTER)
@@ -93,6 +94,9 @@ config SND_SOC_WM8510 
config SND_SOC_WM8580

	tristate



config SND_SOC_WM8728

	tristate



config SND_SOC_WM8731

	tristate

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ snd-soc-twl4030-objs := twl4030.o 
snd-soc-uda1380-objs := uda1380.o

snd-soc-wm8510-objs := wm8510.o

snd-soc-wm8580-objs := wm8580.o

snd-soc-wm8728-objs := wm8728.o

snd-soc-wm8731-objs := wm8731.o

snd-soc-wm8750-objs := wm8750.o

snd-soc-wm8753-objs := wm8753.o
@@ -34,6 +35,7 @@ obj-$(CONFIG_SND_SOC_TWL4030) += snd-soc-twl4030.o 
obj-$(CONFIG_SND_SOC_UDA1380)	+= snd-soc-uda1380.o

obj-$(CONFIG_SND_SOC_WM8510)	+= snd-soc-wm8510.o

obj-$(CONFIG_SND_SOC_WM8580)	+= snd-soc-wm8580.o

obj-$(CONFIG_SND_SOC_WM8728)	+= snd-soc-wm8728.o

obj-$(CONFIG_SND_SOC_WM8731)	+= snd-soc-wm8731.o

obj-$(CONFIG_SND_SOC_WM8750)	+= snd-soc-wm8750.o

obj-$(CONFIG_SND_SOC_WM8753)	+= snd-soc-wm8753.o

sound/soc/codecs/wm8728.c

0 → 100644
+574 −0
Original line number Diff line number Diff line 
/*

 * wm8728.c  --  WM8728 ALSA SoC Audio driver

 *

 * Copyright 2008 Wolfson Microelectronics plc

 *

 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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.

 */



#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/pm.h>

#include <linux/i2c.h>

#include <linux/platform_device.h>

#include <linux/spi/spi.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <sound/initval.h>

#include <sound/tlv.h>



#include "wm8728.h"



struct snd_soc_codec_device soc_codec_dev_wm8728;



/*

 * We can't read the WM8728 register space so we cache them instead.

 * Note that the defaults here aren't the physical defaults, we latch

 * the volume update bits, mute the output and enable infinite zero

 * detect.

 */

static const u16 wm8728_reg_defaults[] = {

	0x1ff,

	0x1ff,

	0x001,

	0x100,

};



static inline unsigned int wm8728_read_reg_cache(struct snd_soc_codec *codec,

	unsigned int reg)

{

	u16 *cache = codec->reg_cache;

	BUG_ON(reg > ARRAY_SIZE(wm8728_reg_defaults));

	return cache[reg];

}



static inline void wm8728_write_reg_cache(struct snd_soc_codec *codec,

	u16 reg, unsigned int value)

{

	u16 *cache = codec->reg_cache;

	BUG_ON(reg > ARRAY_SIZE(wm8728_reg_defaults));

	cache[reg] = value;

}



/*

 * write to the WM8728 register space

 */

static int wm8728_write(struct snd_soc_codec *codec, unsigned int reg,

	unsigned int value)

{

	u8 data[2];



	/* data is

	 *   D15..D9 WM8728 register offset

	 *   D8...D0 register data

	 */

	data[0] = (reg << 1) | ((value >> 8) & 0x0001);

	data[1] = value & 0x00ff;



	wm8728_write_reg_cache(codec, reg, value);



	if (codec->hw_write(codec->control_data, data, 2) == 2)

		return 0;

	else

		return -EIO;

}



static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);



static const struct snd_kcontrol_new wm8728_snd_controls[] = {



SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,

		 0, 255, 0, wm8728_tlv),



SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),

};



static int wm8728_add_controls(struct snd_soc_codec *codec)

{

	int err, i;



	for (i = 0; i < ARRAY_SIZE(wm8728_snd_controls); i++) {

		err = snd_ctl_add(codec->card,

				  snd_soc_cnew(&wm8728_snd_controls[i],

						codec, NULL));

		if (err < 0)

			return err;

	}



	return 0;

}



/*

 * DAPM controls.

 */

static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {

SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_OUTPUT("VOUTL"),

SND_SOC_DAPM_OUTPUT("VOUTR"),

};



static const struct snd_soc_dapm_route intercon[] = {

	{"VOUTL", NULL, "DAC"},

	{"VOUTR", NULL, "DAC"},

};



static int wm8728_add_widgets(struct snd_soc_codec *codec)

{

	snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,

				  ARRAY_SIZE(wm8728_dapm_widgets));



	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));



	snd_soc_dapm_new_widgets(codec);



	return 0;

}



static int wm8728_mute(struct snd_soc_dai *dai, int mute)

{

	struct snd_soc_codec *codec = dai->codec;

	u16 mute_reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);



	if (mute)

		wm8728_write(codec, WM8728_DACCTL, mute_reg | 1);

	else

		wm8728_write(codec, WM8728_DACCTL, mute_reg & ~1);



	return 0;

}



static int wm8728_hw_params(struct snd_pcm_substream *substream,

	struct snd_pcm_hw_params *params)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_device *socdev = rtd->socdev;

	struct snd_soc_codec *codec = socdev->codec;

	u16 dac = wm8728_read_reg_cache(codec, WM8728_DACCTL);



	dac &= ~0x18;



	switch (params_format(params)) {

	case SNDRV_PCM_FORMAT_S16_LE:

		break;

	case SNDRV_PCM_FORMAT_S20_3LE:

		dac |= 0x10;

		break;

	case SNDRV_PCM_FORMAT_S24_LE:

		dac |= 0x08;

		break;

	default:

		return -EINVAL;

	}



	wm8728_write(codec, WM8728_DACCTL, dac);



	return 0;

}



static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,

		unsigned int fmt)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	u16 iface = wm8728_read_reg_cache(codec, WM8728_IFCTL);



	/* Currently only I2S is supported by the driver, though the

	 * hardware is more flexible.

	 */

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		iface |= 1;

		break;

	default:

		return -EINVAL;

	}



	/* The hardware only support full slave mode */

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBS_CFS:

		break;

	default:

		return -EINVAL;

	}



	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_NB_NF:

		iface &= ~0x22;

		break;

	case SND_SOC_DAIFMT_IB_NF:

		iface |=  0x20;

		iface &= ~0x02;

		break;

	case SND_SOC_DAIFMT_NB_IF:

		iface |= 0x02;

		iface &= ~0x20;

		break;

	case SND_SOC_DAIFMT_IB_IF:

		iface |= 0x22;

		break;

	default:

		return -EINVAL;

	}



	wm8728_write(codec, WM8728_IFCTL, iface);

	return 0;

}



static int wm8728_set_bias_level(struct snd_soc_codec *codec,

				 enum snd_soc_bias_level level)

{

	u16 reg;

	int i;



	switch (level) {

	case SND_SOC_BIAS_ON:

	case SND_SOC_BIAS_PREPARE:

	case SND_SOC_BIAS_STANDBY:

		if (codec->bias_level == SND_SOC_BIAS_OFF) {

			/* Power everything up... */

			reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);

			wm8728_write(codec, WM8728_DACCTL, reg & ~0x4);



			/* ..then sync in the register cache. */

			for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)

				wm8728_write(codec, i,

					     wm8728_read_reg_cache(codec, i));

		}

		break;



	case SND_SOC_BIAS_OFF:

		reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);

		wm8728_write(codec, WM8728_DACCTL, reg | 0x4);

		break;

	}

	codec->bias_level = level;

	return 0;

}



#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)



#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\

	SNDRV_PCM_FMTBIT_S24_LE)



struct snd_soc_dai wm8728_dai = {

	.name = "WM8728",

	.playback = {

		.stream_name = "Playback",

		.channels_min = 2,

		.channels_max = 2,

		.rates = WM8728_RATES,

		.formats = WM8728_FORMATS,

	},

	.ops = {

		 .hw_params = wm8728_hw_params,

	},

	.dai_ops = {

		 .digital_mute = wm8728_mute,

		 .set_fmt = wm8728_set_dai_fmt,

	}

};

EXPORT_SYMBOL_GPL(wm8728_dai);



static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = socdev->codec;



	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);



	return 0;

}



static int wm8728_resume(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = socdev->codec;



	wm8728_set_bias_level(codec, codec->suspend_bias_level);



	return 0;

}



/*

 * initialise the WM8728 driver

 * register the mixer and dsp interfaces with the kernel

 */

static int wm8728_init(struct snd_soc_device *socdev)

{

	struct snd_soc_codec *codec = socdev->codec;

	int ret = 0;



	codec->name = "WM8728";

	codec->owner = THIS_MODULE;

	codec->read = wm8728_read_reg_cache;

	codec->write = wm8728_write;

	codec->set_bias_level = wm8728_set_bias_level;

	codec->dai = &wm8728_dai;

	codec->num_dai = 1;

	codec->bias_level = SND_SOC_BIAS_OFF;

	codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);

	codec->reg_cache = kmemdup(wm8728_reg_defaults,

				   sizeof(wm8728_reg_defaults),

				   GFP_KERNEL);

	if (codec->reg_cache == NULL)

		return -ENOMEM;



	/* register pcms */

	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);

	if (ret < 0) {

		printk(KERN_ERR "wm8728: failed to create pcms\n");

		goto pcm_err;

	}



	/* power on device */

	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);



	wm8728_add_controls(codec);

	wm8728_add_widgets(codec);

	ret = snd_soc_register_card(socdev);

	if (ret < 0) {

		printk(KERN_ERR "wm8728: failed to register card\n");

		goto card_err;

	}



	return ret;



card_err:

	snd_soc_free_pcms(socdev);

	snd_soc_dapm_free(socdev);

pcm_err:

	kfree(codec->reg_cache);

	return ret;

}



static struct snd_soc_device *wm8728_socdev;



#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)



/*

 * WM8728 2 wire address is determined by GPIO5

 * state during powerup.

 *    low  = 0x1a

 *    high = 0x1b

 */



static int wm8728_i2c_probe(struct i2c_client *i2c,

			    const struct i2c_device_id *id)

{

	struct snd_soc_device *socdev = wm8728_socdev;

	struct snd_soc_codec *codec = socdev->codec;

	int ret;



	i2c_set_clientdata(i2c, codec);

	codec->control_data = i2c;



	ret = wm8728_init(socdev);

	if (ret < 0)

		pr_err("failed to initialise WM8728\n");



	return ret;

}



static int wm8728_i2c_remove(struct i2c_client *client)

{

	struct snd_soc_codec *codec = i2c_get_clientdata(client);

	kfree(codec->reg_cache);

	return 0;

}



static const struct i2c_device_id wm8728_i2c_id[] = {

	{ "wm8728", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);



static struct i2c_driver wm8728_i2c_driver = {

	.driver = {

		.name = "WM8728 I2C Codec",

		.owner = THIS_MODULE,

	},

	.probe =    wm8728_i2c_probe,

	.remove =   wm8728_i2c_remove,

	.id_table = wm8728_i2c_id,

};



static int wm8728_add_i2c_device(struct platform_device *pdev,

				 const struct wm8728_setup_data *setup)

{

	struct i2c_board_info info;

	struct i2c_adapter *adapter;

	struct i2c_client *client;

	int ret;



	ret = i2c_add_driver(&wm8728_i2c_driver);

	if (ret != 0) {

		dev_err(&pdev->dev, "can't add i2c driver\n");

		return ret;

	}



	memset(&info, 0, sizeof(struct i2c_board_info));

	info.addr = setup->i2c_address;

	strlcpy(info.type, "wm8728", I2C_NAME_SIZE);



	adapter = i2c_get_adapter(setup->i2c_bus);

	if (!adapter) {

		dev_err(&pdev->dev, "can't get i2c adapter %d\n",

			setup->i2c_bus);

		goto err_driver;

	}



	client = i2c_new_device(adapter, &info);

	i2c_put_adapter(adapter);

	if (!client) {

		dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",

			(unsigned int)info.addr);

		goto err_driver;

	}



	return 0;



err_driver:

	i2c_del_driver(&wm8728_i2c_driver);

	return -ENODEV;

}

#endif



#if defined(CONFIG_SPI_MASTER)

static int __devinit wm8728_spi_probe(struct spi_device *spi)

{

	struct snd_soc_device *socdev = wm8728_socdev;

	struct snd_soc_codec *codec = socdev->codec;

	int ret;



	codec->control_data = spi;



	ret = wm8728_init(socdev);

	if (ret < 0)

		dev_err(&spi->dev, "failed to initialise WM8728\n");



	return ret;

}



static int __devexit wm8728_spi_remove(struct spi_device *spi)

{

	return 0;

}



static struct spi_driver wm8728_spi_driver = {

	.driver = {

		.name	= "wm8728",

		.bus	= &spi_bus_type,

		.owner	= THIS_MODULE,

	},

	.probe		= wm8728_spi_probe,

	.remove		= __devexit_p(wm8728_spi_remove),

};



static int wm8728_spi_write(struct spi_device *spi, const char *data, int len)

{

	struct spi_transfer t;

	struct spi_message m;

	u8 msg[2];



	if (len <= 0)

		return 0;



	msg[0] = data[0];

	msg[1] = data[1];



	spi_message_init(&m);

	memset(&t, 0, (sizeof t));



	t.tx_buf = &msg[0];

	t.len = len;



	spi_message_add_tail(&t, &m);

	spi_sync(spi, &m);



	return len;

}

#endif /* CONFIG_SPI_MASTER */



static int wm8728_probe(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct wm8728_setup_data *setup;

	struct snd_soc_codec *codec;

	int ret = 0;



	setup = socdev->codec_data;

	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);

	if (codec == NULL)

		return -ENOMEM;



	socdev->codec = codec;

	mutex_init(&codec->mutex);

	INIT_LIST_HEAD(&codec->dapm_widgets);

	INIT_LIST_HEAD(&codec->dapm_paths);



	wm8728_socdev = socdev;

	ret = -ENODEV;



#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

	if (setup->i2c_address) {

		codec->hw_write = (hw_write_t)i2c_master_send;

		ret = wm8728_add_i2c_device(pdev, setup);

	}

#endif

#if defined(CONFIG_SPI_MASTER)

	if (setup->spi) {

		codec->hw_write = (hw_write_t)wm8728_spi_write;

		ret = spi_register_driver(&wm8728_spi_driver);

		if (ret != 0)

			printk(KERN_ERR "can't add spi driver");

	}

#endif



	if (ret != 0)

		kfree(codec);



	return ret;

}



/* power down chip */

static int wm8728_remove(struct platform_device *pdev)

{

	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	struct snd_soc_codec *codec = socdev->codec;



	if (codec->control_data)

		wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);



	snd_soc_free_pcms(socdev);

	snd_soc_dapm_free(socdev);

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

	i2c_unregister_device(codec->control_data);

	i2c_del_driver(&wm8728_i2c_driver);

#endif

#if defined(CONFIG_SPI_MASTER)

	spi_unregister_driver(&wm8728_spi_driver);

#endif

	kfree(codec);



	return 0;

}



struct snd_soc_codec_device soc_codec_dev_wm8728 = {

	.probe = 	wm8728_probe,

	.remove = 	wm8728_remove,

	.suspend = 	wm8728_suspend,

	.resume =	wm8728_resume,

};

EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);



MODULE_DESCRIPTION("ASoC WM8728 driver");

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");

MODULE_LICENSE("GPL");

sound/soc/codecs/wm8728.h

0 → 100644
+30 −0
Original line number Diff line number Diff line 
/*

 * wm8728.h  --  WM8728 ASoC codec driver

 *

 * Copyright 2008 Wolfson Microelectronics plc

 *

 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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.

 */



#ifndef _WM8728_H

#define _WM8728_H



#define WM8728_DACLVOL   0x00

#define WM8728_DACRVOL   0x01

#define WM8728_DACCTL    0x02

#define WM8728_IFCTL     0x03



struct wm8728_setup_data {

	int            spi;

	int            i2c_bus;

	unsigned short i2c_address;

};



extern struct snd_soc_dai wm8728_dai;

extern struct snd_soc_codec_device soc_codec_dev_wm8728;



#endif