[deliverable/linux.git] / sound / soc / codecs / wm8728.c

/*
 * 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_dai *dai)
{
	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,
		 .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");
Commit	Line	Data
71cfc902 MB	1	/*
	2	* wm8728.c -- WM8728 ALSA SoC Audio driver
	3	*
	4	* Copyright 2008 Wolfson Microelectronics plc
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/init.h>
	16	#include <linux/delay.h>
	17	#include <linux/pm.h>
	18	#include <linux/i2c.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/spi/spi.h>
	21	#include <sound/core.h>
	22	#include <sound/pcm.h>
	23	#include <sound/pcm_params.h>
	24	#include <sound/soc.h>
	25	#include <sound/soc-dapm.h>
	26	#include <sound/initval.h>
	27	#include <sound/tlv.h>
	28
	29	#include "wm8728.h"
	30
	31	struct snd_soc_codec_device soc_codec_dev_wm8728;
	32
	33	/*
	34	* We can't read the WM8728 register space so we cache them instead.
	35	* Note that the defaults here aren't the physical defaults, we latch
	36	* the volume update bits, mute the output and enable infinite zero
	37	* detect.
	38	*/
	39	static const u16 wm8728_reg_defaults[] = {
	40	0x1ff,
	41	0x1ff,
	42	0x001,
	43	0x100,
	44	};
	45
	46	static inline unsigned int wm8728_read_reg_cache(struct snd_soc_codec *codec,
	47	unsigned int reg)
	48	{
	49	u16 *cache = codec->reg_cache;
	50	BUG_ON(reg > ARRAY_SIZE(wm8728_reg_defaults));
	51	return cache[reg];
	52	}
	53
	54	static inline void wm8728_write_reg_cache(struct snd_soc_codec *codec,
	55	u16 reg, unsigned int value)
	56	{
	57	u16 *cache = codec->reg_cache;
	58	BUG_ON(reg > ARRAY_SIZE(wm8728_reg_defaults));
	59	cache[reg] = value;
	60	}
	61
	62	/*
	63	* write to the WM8728 register space
	64	*/
65	static int wm8728_write(struct snd_soc_codec *codec, unsigned int reg,
66	unsigned int value)
67	{
68	u8 data[2];
69
70	/* data is
71	* D15..D9 WM8728 register offset
72	* D8...D0 register data
73	*/
74	data[0] = (reg << 1) \| ((value >> 8) & 0x0001);
75	data[1] = value & 0x00ff;
76
77	wm8728_write_reg_cache(codec, reg, value);
78
79	if (codec->hw_write(codec->control_data, data, 2) == 2)
80	return 0;
81	else
82	return -EIO;
83	}
84
85	static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
86
87	static const struct snd_kcontrol_new wm8728_snd_controls[] = {
88
89	SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
90	0, 255, 0, wm8728_tlv),
91
92	SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
93	};
94
95	static int wm8728_add_controls(struct snd_soc_codec *codec)
96	{
97	int err, i;
98
99	for (i = 0; i < ARRAY_SIZE(wm8728_snd_controls); i++) {
100	err = snd_ctl_add(codec->card,
101	snd_soc_cnew(&wm8728_snd_controls[i],
102	codec, NULL));
103	if (err < 0)
104	return err;
105	}
106
107	return 0;
108	}
109
110	/*
111	* DAPM controls.
112	*/
113	static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
114	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
115	SND_SOC_DAPM_OUTPUT("VOUTL"),
116	SND_SOC_DAPM_OUTPUT("VOUTR"),
117	};
118
119	static const struct snd_soc_dapm_route intercon[] = {
120	{"VOUTL", NULL, "DAC"},
121	{"VOUTR", NULL, "DAC"},
122	};
123
124	static int wm8728_add_widgets(struct snd_soc_codec *codec)
125	{
126	snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
127	ARRAY_SIZE(wm8728_dapm_widgets));
128
129	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
130
131	snd_soc_dapm_new_widgets(codec);
132
133	return 0;
134	}
135
136	static int wm8728_mute(struct snd_soc_dai *dai, int mute)
137	{
138	struct snd_soc_codec *codec = dai->codec;
139	u16 mute_reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
140
141	if (mute)
142	wm8728_write(codec, WM8728_DACCTL, mute_reg \| 1);
143	else
144	wm8728_write(codec, WM8728_DACCTL, mute_reg & ~1);
145
146	return 0;
147	}
148
149	static int wm8728_hw_params(struct snd_pcm_substream *substream,
dee89c4d MB	150	struct snd_pcm_hw_params *params,
dee89c4d MB	151	struct snd_soc_dai *dai)
71cfc902 MB	152	{
	153	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	154	struct snd_soc_device *socdev = rtd->socdev;
	155	struct snd_soc_codec *codec = socdev->codec;
	156	u16 dac = wm8728_read_reg_cache(codec, WM8728_DACCTL);
	157
	158	dac &= ~0x18;
	159
	160	switch (params_format(params)) {
	161	case SNDRV_PCM_FORMAT_S16_LE:
	162	break;
	163	case SNDRV_PCM_FORMAT_S20_3LE:
	164	dac \|= 0x10;
	165	break;
	166	case SNDRV_PCM_FORMAT_S24_LE:
	167	dac \|= 0x08;
	168	break;
	169	default:
	170	return -EINVAL;
	171	}
	172
	173	wm8728_write(codec, WM8728_DACCTL, dac);
	174
	175	return 0;
	176	}
	177
	178	static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
	179	unsigned int fmt)
	180	{
	181	struct snd_soc_codec *codec = codec_dai->codec;
	182	u16 iface = wm8728_read_reg_cache(codec, WM8728_IFCTL);
	183
	184	/* Currently only I2S is supported by the driver, though the
	185	* hardware is more flexible.
	186	*/
	187	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	188	case SND_SOC_DAIFMT_I2S:
	189	iface \|= 1;
	190	break;
	191	default:
	192	return -EINVAL;
	193	}
	194
	195	/* The hardware only support full slave mode */
	196	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	197	case SND_SOC_DAIFMT_CBS_CFS:
	198	break;
	199	default:
	200	return -EINVAL;
	201	}
	202
	203	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	204	case SND_SOC_DAIFMT_NB_NF:
	205	iface &= ~0x22;
	206	break;
	207	case SND_SOC_DAIFMT_IB_NF:
	208	iface \|= 0x20;
	209	iface &= ~0x02;
	210	break;
	211	case SND_SOC_DAIFMT_NB_IF:
	212	iface \|= 0x02;
	213	iface &= ~0x20;
	214	break;
	215	case SND_SOC_DAIFMT_IB_IF:
216	iface \|= 0x22;
217	break;
218	default:
219	return -EINVAL;
220	}
221
222	wm8728_write(codec, WM8728_IFCTL, iface);
223	return 0;
224	}
225
226	static int wm8728_set_bias_level(struct snd_soc_codec *codec,
227	enum snd_soc_bias_level level)
228	{
229	u16 reg;
230	int i;
231
232	switch (level) {
233	case SND_SOC_BIAS_ON:
234	case SND_SOC_BIAS_PREPARE:
235	case SND_SOC_BIAS_STANDBY:
236	if (codec->bias_level == SND_SOC_BIAS_OFF) {
237	/* Power everything up... */
238	reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
239	wm8728_write(codec, WM8728_DACCTL, reg & ~0x4);
240
241	/* ..then sync in the register cache. */
242	for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
243	wm8728_write(codec, i,
244	wm8728_read_reg_cache(codec, i));
245	}
246	break;
247
248	case SND_SOC_BIAS_OFF:
249	reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
250	wm8728_write(codec, WM8728_DACCTL, reg \| 0x4);
251	break;
252	}
253	codec->bias_level = level;
254	return 0;
255	}
256
257	#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
258
259	#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
260	SNDRV_PCM_FMTBIT_S24_LE)
261
262	struct snd_soc_dai wm8728_dai = {
263	.name = "WM8728",
264	.playback = {
265	.stream_name = "Playback",
266	.channels_min = 2,
267	.channels_max = 2,
268	.rates = WM8728_RATES,
269	.formats = WM8728_FORMATS,
270	},
271	.ops = {
272	.hw_params = wm8728_hw_params,
71cfc902 MB	273	.digital_mute = wm8728_mute,
	274	.set_fmt = wm8728_set_dai_fmt,
	275	}
	276	};
	277	EXPORT_SYMBOL_GPL(wm8728_dai);
	278
	279	static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
	280	{
	281	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	282	struct snd_soc_codec *codec = socdev->codec;
	283
	284	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
	285
	286	return 0;
	287	}
	288
	289	static int wm8728_resume(struct platform_device *pdev)
	290	{
	291	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	292	struct snd_soc_codec *codec = socdev->codec;
	293
	294	wm8728_set_bias_level(codec, codec->suspend_bias_level);
	295
	296	return 0;
	297	}
	298
	299	/*
	300	* initialise the WM8728 driver
	301	* register the mixer and dsp interfaces with the kernel
	302	*/
	303	static int wm8728_init(struct snd_soc_device *socdev)
	304	{
	305	struct snd_soc_codec *codec = socdev->codec;
	306	int ret = 0;
	307
	308	codec->name = "WM8728";
	309	codec->owner = THIS_MODULE;
	310	codec->read = wm8728_read_reg_cache;
	311	codec->write = wm8728_write;
	312	codec->set_bias_level = wm8728_set_bias_level;
	313	codec->dai = &wm8728_dai;
	314	codec->num_dai = 1;
	315	codec->bias_level = SND_SOC_BIAS_OFF;
	316	codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
	317	codec->reg_cache = kmemdup(wm8728_reg_defaults,
	318	sizeof(wm8728_reg_defaults),
	319	GFP_KERNEL);
	320	if (codec->reg_cache == NULL)
	321	return -ENOMEM;
	322
	323	/* register pcms */
	324	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	325	if (ret < 0) {
	326	printk(KERN_ERR "wm8728: failed to create pcms\n");
	327	goto pcm_err;
	328	}
	329
	330	/* power on device */
	331	wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	332
	333	wm8728_add_controls(codec);
	334	wm8728_add_widgets(codec);
	335	ret = snd_soc_register_card(socdev);
	336	if (ret < 0) {
337	printk(KERN_ERR "wm8728: failed to register card\n");
338	goto card_err;
339	}
340
341	return ret;
342
343	card_err:
344	snd_soc_free_pcms(socdev);
345	snd_soc_dapm_free(socdev);
346	pcm_err:
347	kfree(codec->reg_cache);
348	return ret;
349	}
350
351	static struct snd_soc_device *wm8728_socdev;
352
353	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
354
355	/*
356	* WM8728 2 wire address is determined by GPIO5
357	* state during powerup.
358	* low = 0x1a
359	* high = 0x1b
360	*/
361
362	static int wm8728_i2c_probe(struct i2c_client *i2c,
363	const struct i2c_device_id *id)
364	{
365	struct snd_soc_device *socdev = wm8728_socdev;
366	struct snd_soc_codec *codec = socdev->codec;
367	int ret;
368
369	i2c_set_clientdata(i2c, codec);
370	codec->control_data = i2c;
371
372	ret = wm8728_init(socdev);
373	if (ret < 0)
374	pr_err("failed to initialise WM8728\n");
375
376	return ret;
377	}
378
379	static int wm8728_i2c_remove(struct i2c_client *client)
380	{
381	struct snd_soc_codec *codec = i2c_get_clientdata(client);
382	kfree(codec->reg_cache);
383	return 0;
384	}
385
386	static const struct i2c_device_id wm8728_i2c_id[] = {
387	{ "wm8728", 0 },
388	{ }
389	};
390	MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
391
392	static struct i2c_driver wm8728_i2c_driver = {
393	.driver = {
394	.name = "WM8728 I2C Codec",
395	.owner = THIS_MODULE,
396	},
397	.probe = wm8728_i2c_probe,
398	.remove = wm8728_i2c_remove,
399	.id_table = wm8728_i2c_id,
400	};
401
402	static int wm8728_add_i2c_device(struct platform_device *pdev,
403	const struct wm8728_setup_data *setup)
404	{
405	struct i2c_board_info info;
406	struct i2c_adapter *adapter;
407	struct i2c_client *client;
408	int ret;
409
410	ret = i2c_add_driver(&wm8728_i2c_driver);
411	if (ret != 0) {
412	dev_err(&pdev->dev, "can't add i2c driver\n");
413	return ret;
414	}
415
416	memset(&info, 0, sizeof(struct i2c_board_info));
417	info.addr = setup->i2c_address;
418	strlcpy(info.type, "wm8728", I2C_NAME_SIZE);
419
420	adapter = i2c_get_adapter(setup->i2c_bus);
421	if (!adapter) {
422	dev_err(&pdev->dev, "can't get i2c adapter %d\n",
423	setup->i2c_bus);
424	goto err_driver;
425	}
426
427	client = i2c_new_device(adapter, &info);
428	i2c_put_adapter(adapter);
429	if (!client) {
430	dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
431	(unsigned int)info.addr);
432	goto err_driver;
433	}
434
435	return 0;
436
437	err_driver:
438	i2c_del_driver(&wm8728_i2c_driver);
439	return -ENODEV;
440	}
441	#endif
442
443	#if defined(CONFIG_SPI_MASTER)
444	static int __devinit wm8728_spi_probe(struct spi_device *spi)
445	{
446	struct snd_soc_device *socdev = wm8728_socdev;
447	struct snd_soc_codec *codec = socdev->codec;
448	int ret;
449
450	codec->control_data = spi;
451
452	ret = wm8728_init(socdev);
453	if (ret < 0)
454	dev_err(&spi->dev, "failed to initialise WM8728\n");
455
456	return ret;
457	}
458
459	static int __devexit wm8728_spi_remove(struct spi_device *spi)
460	{
461	return 0;
462	}
463
464	static struct spi_driver wm8728_spi_driver = {
465	.driver = {
466	.name = "wm8728",
467	.bus = &spi_bus_type,
468	.owner = THIS_MODULE,
469	},
470	.probe = wm8728_spi_probe,
471	.remove = __devexit_p(wm8728_spi_remove),
472	};
473
474	static int wm8728_spi_write(struct spi_device spi, const char data, int len)
475	{
476	struct spi_transfer t;
477	struct spi_message m;
478	u8 msg[2];
479
480	if (len <= 0)
481	return 0;
482
483	msg[0] = data[0];
484	msg[1] = data[1];
485
486	spi_message_init(&m);
487	memset(&t, 0, (sizeof t));
488
489	t.tx_buf = &msg[0];
490	t.len = len;
491
492	spi_message_add_tail(&t, &m);
493	spi_sync(spi, &m);
494
495	return len;
496	}
497	#endif /* CONFIG_SPI_MASTER */
498
499	static int wm8728_probe(struct platform_device *pdev)
500	{
501	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
502	struct wm8728_setup_data *setup;
503	struct snd_soc_codec *codec;
504	int ret = 0;
505
506	setup = socdev->codec_data;
507	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
508	if (codec == NULL)
509	return -ENOMEM;
510
511	socdev->codec = codec;
512	mutex_init(&codec->mutex);
513	INIT_LIST_HEAD(&codec->dapm_widgets);
514	INIT_LIST_HEAD(&codec->dapm_paths);
515
516	wm8728_socdev = socdev;
517	ret = -ENODEV;
518
519	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
520	if (setup->i2c_address) {
521	codec->hw_write = (hw_write_t)i2c_master_send;
522	ret = wm8728_add_i2c_device(pdev, setup);
523	}
524	#endif
525	#if defined(CONFIG_SPI_MASTER)
526	if (setup->spi) {
527	codec->hw_write = (hw_write_t)wm8728_spi_write;
528	ret = spi_register_driver(&wm8728_spi_driver);
529	if (ret != 0)
530	printk(KERN_ERR "can't add spi driver");
531	}
532	#endif
533
534	if (ret != 0)
535	kfree(codec);
536
537	return ret;
538	}
539
540	/* power down chip */
541	static int wm8728_remove(struct platform_device *pdev)
542	{
543	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
544	struct snd_soc_codec *codec = socdev->codec;
545
546	if (codec->control_data)
547	wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
548
549	snd_soc_free_pcms(socdev);
550	snd_soc_dapm_free(socdev);
551	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
552	i2c_unregister_device(codec->control_data);
553	i2c_del_driver(&wm8728_i2c_driver);
554	#endif
555	#if defined(CONFIG_SPI_MASTER)
556	spi_unregister_driver(&wm8728_spi_driver);
557	#endif
558	kfree(codec);
559
560	return 0;
561	}
562
563	struct snd_soc_codec_device soc_codec_dev_wm8728 = {
564	.probe = wm8728_probe,
565	.remove = wm8728_remove,
566	.suspend = wm8728_suspend,
567	.resume = wm8728_resume,
568	};
569	EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);
570
571	MODULE_DESCRIPTION("ASoC WM8728 driver");
572	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
573	MODULE_LICENSE("GPL");