[mirror_ubuntu-zesty-kernel.git] / sound / soc / codecs / ad1836.c

/*
 * File:         sound/soc/codecs/ad1836.c
 * Author:       Barry Song <Barry.Song@analog.com>
 *
 * Created:      Aug 04 2009
 * Description:  Driver for AD1836 sound chip
 *
 * Modified:
 *               Copyright 2009 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/soc-dapm.h>
#include <linux/spi/spi.h>
#include "ad1836.h"

/* codec private data */
struct ad1836_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[AD1836_NUM_REGS];
};

static struct snd_soc_codec *ad1836_codec;
struct snd_soc_codec_device soc_codec_dev_ad1836;
static int ad1836_register(struct ad1836_priv *ad1836);
static void ad1836_unregister(struct ad1836_priv *ad1836);

/*
 * AD1836 volume/mute/de-emphasis etc. controls
 */
static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};

static const struct soc_enum ad1836_deemp_enum =
	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);

static const struct snd_kcontrol_new ad1836_snd_controls[] = {
	/* DAC volume control */
	SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
			AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
			AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
	SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
			AD1836_DAC_R3_VOL, 0, 0x3FF, 0),

	/* ADC switch control */
	SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
		AD1836_ADCR1_MUTE, 1, 1),
	SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
		AD1836_ADCR2_MUTE, 1, 1),

	/* DAC switch control */
	SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
		AD1836_DACR1_MUTE, 1, 1),
	SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
		AD1836_DACR2_MUTE, 1, 1),
	SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
		AD1836_DACR3_MUTE, 1, 1),

	/* ADC high-pass filter */
	SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
			AD1836_ADC_HIGHPASS_FILTER, 1, 0),

	/* DAC de-emphasis */
	SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
};

static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
				AD1836_DAC_POWERDOWN, 1),
	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
				AD1836_ADC_POWERDOWN, 1, NULL, 0),
	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
	SND_SOC_DAPM_INPUT("ADC1IN"),
	SND_SOC_DAPM_INPUT("ADC2IN"),
};

static const struct snd_soc_dapm_route audio_paths[] = {
	{ "DAC", NULL, "ADC_PWR" },
	{ "ADC", NULL, "ADC_PWR" },
	{ "DAC1OUT", "DAC1 Switch", "DAC" },
	{ "DAC2OUT", "DAC2 Switch", "DAC" },
	{ "DAC3OUT", "DAC3 Switch", "DAC" },
	{ "ADC", "ADC1 Switch", "ADC1IN" },
	{ "ADC", "ADC2 Switch", "ADC2IN" },
};

/*
 * DAI ops entries
 */

static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	/* at present, we support adc aux mode to interface with
	 * blackfin sport tdm mode
	 */
	case SND_SOC_DAIFMT_DSP_A:
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	/* ALCLK,ABCLK are both output, AD1836 can only be master */
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ad1836_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
{
	int word_len = 0;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		word_len = 3;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		word_len = 1;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
	case SNDRV_PCM_FORMAT_S32_LE:
		word_len = 0;
		break;
	}

	snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
		AD1836_DAC_WORD_LEN_MASK, word_len);

	snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
		AD1836_ADC_WORD_LEN_MASK, word_len);

	return 0;
}


/*
 * interface to read/write ad1836 register
 */
#define AD1836_SPI_REG_SHFT 12
#define AD1836_SPI_READ     (1 << 11)
#define AD1836_SPI_VAL_MSK  0x3FF

/*
 * write to the ad1836 register space
 */

static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
		unsigned int value)
{
	u16 *reg_cache = codec->reg_cache;
	int ret = 0;

	if (value != reg_cache[reg]) {
		unsigned short buf;
		struct spi_transfer t = {
			.tx_buf = &buf,
			.len = 2,
		};
		struct spi_message m;

		buf = (reg << AD1836_SPI_REG_SHFT) |
			(value & AD1836_SPI_VAL_MSK);
		spi_message_init(&m);
		spi_message_add_tail(&t, &m);
		ret = spi_sync(codec->control_data, &m);
		if (ret == 0)
			reg_cache[reg] = value;
	}

	return ret;
}

/*
 * read from the ad1836 register space cache
 */
static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
					  unsigned int reg)
{
	u16 *reg_cache = codec->reg_cache;

	if (reg >= codec->reg_cache_size)
		return -EINVAL;

	return reg_cache[reg];
}

static int __devinit ad1836_spi_probe(struct spi_device *spi)
{
	struct snd_soc_codec *codec;
	struct ad1836_priv *ad1836;

	ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
	if (ad1836 == NULL)
		return -ENOMEM;

	codec = &ad1836->codec;
	codec->control_data = spi;
	codec->dev = &spi->dev;

	dev_set_drvdata(&spi->dev, ad1836);

	return ad1836_register(ad1836);
}

static int __devexit ad1836_spi_remove(struct spi_device *spi)
{
	struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);

	ad1836_unregister(ad1836);
	return 0;
}

static struct spi_driver ad1836_spi_driver = {
	.driver = {
		.name	= "ad1836",
		.owner	= THIS_MODULE,
	},
	.probe		= ad1836_spi_probe,
	.remove		= __devexit_p(ad1836_spi_remove),
};

static struct snd_soc_dai_ops ad1836_dai_ops = {
	.hw_params = ad1836_hw_params,
	.set_fmt = ad1836_set_dai_fmt,
};

/* codec DAI instance */
struct snd_soc_dai ad1836_dai = {
	.name = "AD1836",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 6,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 4,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops = &ad1836_dai_ops,
};
EXPORT_SYMBOL_GPL(ad1836_dai);

static int ad1836_register(struct ad1836_priv *ad1836)
{
	int ret;
	struct snd_soc_codec *codec = &ad1836->codec;

	if (ad1836_codec) {
		dev_err(codec->dev, "Another ad1836 is registered\n");
		return -EINVAL;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	codec->private_data = ad1836;
	codec->reg_cache = ad1836->reg_cache;
	codec->reg_cache_size = AD1836_NUM_REGS;
	codec->name = "AD1836";
	codec->owner = THIS_MODULE;
	codec->dai = &ad1836_dai;
	codec->num_dai = 1;
	codec->write = ad1836_write_reg;
	codec->read = ad1836_read_reg_cache;
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	ad1836_dai.dev = codec->dev;
	ad1836_codec = codec;

	/* default setting for ad1836 */
	/* de-emphasis: 48kHz, power-on dac */
	codec->write(codec, AD1836_DAC_CTRL1, 0x300);
	/* unmute dac channels */
	codec->write(codec, AD1836_DAC_CTRL2, 0x0);
	/* high-pass filter enable, power-on adc */
	codec->write(codec, AD1836_ADC_CTRL1, 0x100);
	/* unmute adc channles, adc aux mode */
	codec->write(codec, AD1836_ADC_CTRL2, 0x180);
	/* left/right diff:PGA/MUX */
	codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
	/* volume */
	codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
	codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
		kfree(ad1836);
		return ret;
	}

	ret = snd_soc_register_dai(&ad1836_dai);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
		snd_soc_unregister_codec(codec);
		kfree(ad1836);
		return ret;
	}

	return 0;
}

static void ad1836_unregister(struct ad1836_priv *ad1836)
{
	snd_soc_unregister_dai(&ad1836_dai);
	snd_soc_unregister_codec(&ad1836->codec);
	kfree(ad1836);
	ad1836_codec = NULL;
}

static int ad1836_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	if (ad1836_codec == NULL) {
		dev_err(&pdev->dev, "Codec device not registered\n");
		return -ENODEV;
	}

	socdev->card->codec = ad1836_codec;
	codec = ad1836_codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
		goto pcm_err;
	}

	snd_soc_add_controls(codec, ad1836_snd_controls,
			     ARRAY_SIZE(ad1836_snd_controls));
	snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
				  ARRAY_SIZE(ad1836_dapm_widgets));
	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
	snd_soc_dapm_new_widgets(codec);

	ret = snd_soc_init_card(socdev);
	if (ret < 0) {
		dev_err(codec->dev, "failed to register card: %d\n", ret);
		goto card_err;
	}

	return ret;

card_err:
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
pcm_err:
	return ret;
}

/* power down chip */
static int ad1836_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_ad1836 = {
	.probe = 	ad1836_probe,
	.remove = 	ad1836_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);

static int __init ad1836_init(void)
{
	int ret;

	ret = spi_register_driver(&ad1836_spi_driver);
	if (ret != 0) {
		printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
				ret);
	}

	return ret;
}
module_init(ad1836_init);

static void __exit ad1836_exit(void)
{
	spi_unregister_driver(&ad1836_spi_driver);
}
module_exit(ad1836_exit);

MODULE_DESCRIPTION("ASoC ad1836 driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
7eaae41e BS	1	/*
	2	* File: sound/soc/codecs/ad1836.c
	3	* Author: Barry Song <Barry.Song@analog.com>
	4	*
	5	* Created: Aug 04 2009
	6	* Description: Driver for AD1836 sound chip
	7	*
	8	* Modified:
	9	* Copyright 2009 Analog Devices Inc.
	10	*
	11	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*/
	18
	19	#include <linux/init.h>
	20	#include <linux/module.h>
7eaae41e BS	21	#include <linux/kernel.h>
	22	#include <linux/device.h>
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25	#include <sound/pcm_params.h>
	26	#include <sound/initval.h>
	27	#include <sound/soc.h>
	28	#include <sound/tlv.h>
	29	#include <sound/soc-dapm.h>
	30	#include <linux/spi/spi.h>
	31	#include "ad1836.h"
	32
	33	/* codec private data */
	34	struct ad1836_priv {
	35	struct snd_soc_codec codec;
	36	u16 reg_cache[AD1836_NUM_REGS];
	37	};
	38
	39	static struct snd_soc_codec *ad1836_codec;
	40	struct snd_soc_codec_device soc_codec_dev_ad1836;
	41	static int ad1836_register(struct ad1836_priv *ad1836);
	42	static void ad1836_unregister(struct ad1836_priv *ad1836);
	43
	44	/*
	45	* AD1836 volume/mute/de-emphasis etc. controls
	46	*/
	47	static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};
	48
	49	static const struct soc_enum ad1836_deemp_enum =
	50	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);
	51
	52	static const struct snd_kcontrol_new ad1836_snd_controls[] = {
	53	/* DAC volume control */
	54	SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
	55	AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
	56	SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
	57	AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
	58	SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
	59	AD1836_DAC_R3_VOL, 0, 0x3FF, 0),
	60
	61	/* ADC switch control */
	62	SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
	63	AD1836_ADCR1_MUTE, 1, 1),
	64	SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
	65	AD1836_ADCR2_MUTE, 1, 1),
	66
	67	/* DAC switch control */
	68	SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
	69	AD1836_DACR1_MUTE, 1, 1),
	70	SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
	71	AD1836_DACR2_MUTE, 1, 1),
	72	SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
	73	AD1836_DACR3_MUTE, 1, 1),
	74
	75	/* ADC high-pass filter */
	76	SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
	77	AD1836_ADC_HIGHPASS_FILTER, 1, 0),
	78
	79	/* DAC de-emphasis */
	80	SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
	81	};
	82
	83	static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
	84	SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
85	AD1836_DAC_POWERDOWN, 1),
86	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
87	SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
88	AD1836_ADC_POWERDOWN, 1, NULL, 0),
89	SND_SOC_DAPM_OUTPUT("DAC1OUT"),
90	SND_SOC_DAPM_OUTPUT("DAC2OUT"),
91	SND_SOC_DAPM_OUTPUT("DAC3OUT"),
92	SND_SOC_DAPM_INPUT("ADC1IN"),
93	SND_SOC_DAPM_INPUT("ADC2IN"),
94	};
95
96	static const struct snd_soc_dapm_route audio_paths[] = {
97	{ "DAC", NULL, "ADC_PWR" },
98	{ "ADC", NULL, "ADC_PWR" },
99	{ "DAC1OUT", "DAC1 Switch", "DAC" },
100	{ "DAC2OUT", "DAC2 Switch", "DAC" },
101	{ "DAC3OUT", "DAC3 Switch", "DAC" },
102	{ "ADC", "ADC1 Switch", "ADC1IN" },
103	{ "ADC", "ADC2 Switch", "ADC2IN" },
104	};
105
106	/*
107	* DAI ops entries
108	*/
109
110	static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
111	unsigned int fmt)
112	{
113	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
114	/* at present, we support adc aux mode to interface with
115	* blackfin sport tdm mode
116	*/
117	case SND_SOC_DAIFMT_DSP_A:
118	break;
119	default:
120	return -EINVAL;
121	}
122
123	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
124	case SND_SOC_DAIFMT_IB_IF:
125	break;
126	default:
127	return -EINVAL;
128	}
129
130	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
131	/* ALCLK,ABCLK are both output, AD1836 can only be master */
132	case SND_SOC_DAIFMT_CBM_CFM:
133	break;
134	default:
135	return -EINVAL;
136	}
137
138	return 0;
139	}
140
141	static int ad1836_hw_params(struct snd_pcm_substream *substream,
142	struct snd_pcm_hw_params *params,
143	struct snd_soc_dai *dai)
144	{
145	int word_len = 0;
146
147	struct snd_soc_pcm_runtime *rtd = substream->private_data;
148	struct snd_soc_device *socdev = rtd->socdev;
149	struct snd_soc_codec *codec = socdev->card->codec;
150
151	/* bit size */
152	switch (params_format(params)) {
153	case SNDRV_PCM_FORMAT_S16_LE:
154	word_len = 3;
155	break;
156	case SNDRV_PCM_FORMAT_S20_3LE:
157	word_len = 1;
158	break;
159	case SNDRV_PCM_FORMAT_S24_LE:
160	case SNDRV_PCM_FORMAT_S32_LE:
161	word_len = 0;
162	break;
163	}
164
165	snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
166	AD1836_DAC_WORD_LEN_MASK, word_len);
167
168	snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
169	AD1836_ADC_WORD_LEN_MASK, word_len);
170
171	return 0;
172	}
173
174
175	/*
176	* interface to read/write ad1836 register
177	*/
178	#define AD1836_SPI_REG_SHFT 12
179	#define AD1836_SPI_READ (1 << 11)
180	#define AD1836_SPI_VAL_MSK 0x3FF
181
182	/*
183	* write to the ad1836 register space
184	*/
185
186	static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
187	unsigned int value)
188	{
189	u16 *reg_cache = codec->reg_cache;
190	int ret = 0;
191
192	if (value != reg_cache[reg]) {
193	unsigned short buf;
194	struct spi_transfer t = {
195	.tx_buf = &buf,
196	.len = 2,
197	};
198	struct spi_message m;
199
200	buf = (reg << AD1836_SPI_REG_SHFT) \|
201	(value & AD1836_SPI_VAL_MSK);
202	spi_message_init(&m);
203	spi_message_add_tail(&t, &m);
204	ret = spi_sync(codec->control_data, &m);
205	if (ret == 0)
206	reg_cache[reg] = value;
207	}
208
209	return ret;
210	}
211
212	/*
213	* read from the ad1836 register space cache
214	*/
215	static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
216	unsigned int reg)
217	{
218	u16 *reg_cache = codec->reg_cache;
219
220	if (reg >= codec->reg_cache_size)
221	return -EINVAL;
222
223	return reg_cache[reg];
224	}
225
226	static int __devinit ad1836_spi_probe(struct spi_device *spi)
227	{
228	struct snd_soc_codec *codec;
229	struct ad1836_priv *ad1836;
230
231	ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
232	if (ad1836 == NULL)
233	return -ENOMEM;
234
235	codec = &ad1836->codec;
236	codec->control_data = spi;
237	codec->dev = &spi->dev;
238
239	dev_set_drvdata(&spi->dev, ad1836);
240
241	return ad1836_register(ad1836);
242	}
243
244	static int __devexit ad1836_spi_remove(struct spi_device *spi)
245	{
246	struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);
247
248	ad1836_unregister(ad1836);
249	return 0;
250	}
251
252	static struct spi_driver ad1836_spi_driver = {
253	.driver = {
98235a4b	254	.name = "ad1836",
7eaae41e BS	255	.owner = THIS_MODULE,
	256	},
	257	.probe = ad1836_spi_probe,
	258	.remove = __devexit_p(ad1836_spi_remove),
	259	};
	260
	261	static struct snd_soc_dai_ops ad1836_dai_ops = {
	262	.hw_params = ad1836_hw_params,
	263	.set_fmt = ad1836_set_dai_fmt,
	264	};
	265
	266	/* codec DAI instance */
	267	struct snd_soc_dai ad1836_dai = {
	268	.name = "AD1836",
	269	.playback = {
	270	.stream_name = "Playback",
	271	.channels_min = 2,
	272	.channels_max = 6,
	273	.rates = SNDRV_PCM_RATE_48000,
	274	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S16_LE \|
	275	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_S24_LE,
	276	},
	277	.capture = {
	278	.stream_name = "Capture",
	279	.channels_min = 2,
	280	.channels_max = 4,
	281	.rates = SNDRV_PCM_RATE_48000,
	282	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S16_LE \|
	283	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_S24_LE,
	284	},
	285	.ops = &ad1836_dai_ops,
	286	};
	287	EXPORT_SYMBOL_GPL(ad1836_dai);
	288
	289	static int ad1836_register(struct ad1836_priv *ad1836)
	290	{
	291	int ret;
	292	struct snd_soc_codec *codec = &ad1836->codec;
	293
	294	if (ad1836_codec) {
	295	dev_err(codec->dev, "Another ad1836 is registered\n");
	296	return -EINVAL;
	297	}
	298
	299	mutex_init(&codec->mutex);
	300	INIT_LIST_HEAD(&codec->dapm_widgets);
	301	INIT_LIST_HEAD(&codec->dapm_paths);
	302	codec->private_data = ad1836;
	303	codec->reg_cache = ad1836->reg_cache;
	304	codec->reg_cache_size = AD1836_NUM_REGS;
	305	codec->name = "AD1836";
	306	codec->owner = THIS_MODULE;
	307	codec->dai = &ad1836_dai;
	308	codec->num_dai = 1;
	309	codec->write = ad1836_write_reg;
	310	codec->read = ad1836_read_reg_cache;
	311	INIT_LIST_HEAD(&codec->dapm_widgets);
	312	INIT_LIST_HEAD(&codec->dapm_paths);
	313
	314	ad1836_dai.dev = codec->dev;
	315	ad1836_codec = codec;
	316
	317	/* default setting for ad1836 */
	318	/* de-emphasis: 48kHz, power-on dac */
319	codec->write(codec, AD1836_DAC_CTRL1, 0x300);
320	/* unmute dac channels */
321	codec->write(codec, AD1836_DAC_CTRL2, 0x0);
322	/* high-pass filter enable, power-on adc */
323	codec->write(codec, AD1836_ADC_CTRL1, 0x100);
324	/* unmute adc channles, adc aux mode */
325	codec->write(codec, AD1836_ADC_CTRL2, 0x180);
326	/* left/right diff:PGA/MUX */
327	codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
328	/* volume */
329	codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
330	codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
331	codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
332	codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
333	codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
334	codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);
335
336	ret = snd_soc_register_codec(codec);
337	if (ret != 0) {
338	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
339	kfree(ad1836);
340	return ret;
341	}
342
343	ret = snd_soc_register_dai(&ad1836_dai);
344	if (ret != 0) {
345	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
346	snd_soc_unregister_codec(codec);
347	kfree(ad1836);
348	return ret;
349	}
350
351	return 0;
352	}
353
354	static void ad1836_unregister(struct ad1836_priv *ad1836)
355	{
356	snd_soc_unregister_dai(&ad1836_dai);
357	snd_soc_unregister_codec(&ad1836->codec);
358	kfree(ad1836);
359	ad1836_codec = NULL;
360	}
361
362	static int ad1836_probe(struct platform_device *pdev)
363	{
364	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
365	struct snd_soc_codec *codec;
366	int ret = 0;
367
368	if (ad1836_codec == NULL) {
369	dev_err(&pdev->dev, "Codec device not registered\n");
370	return -ENODEV;
371	}
372
373	socdev->card->codec = ad1836_codec;
374	codec = ad1836_codec;
375
376	/* register pcms */
377	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
378	if (ret < 0) {
379	dev_err(codec->dev, "failed to create pcms: %d\n", ret);
380	goto pcm_err;
381	}
382
383	snd_soc_add_controls(codec, ad1836_snd_controls,
384	ARRAY_SIZE(ad1836_snd_controls));
385	snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
386	ARRAY_SIZE(ad1836_dapm_widgets));
387	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
388	snd_soc_dapm_new_widgets(codec);
389
390	ret = snd_soc_init_card(socdev);
391	if (ret < 0) {
392	dev_err(codec->dev, "failed to register card: %d\n", ret);
393	goto card_err;
394	}
395
396	return ret;
397
398	card_err:
399	snd_soc_free_pcms(socdev);
400	snd_soc_dapm_free(socdev);
401	pcm_err:
402	return ret;
403	}
404
405	/* power down chip */
406	static int ad1836_remove(struct platform_device *pdev)
407	{
408	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
409
410	snd_soc_free_pcms(socdev);
411	snd_soc_dapm_free(socdev);
412
413	return 0;
414	}
415
416	struct snd_soc_codec_device soc_codec_dev_ad1836 = {
417	.probe = ad1836_probe,
418	.remove = ad1836_remove,
7eaae41e BS	419	};
	420	EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);
	421
	422	static int __init ad1836_init(void)
	423	{
	424	int ret;
	425
	426	ret = spi_register_driver(&ad1836_spi_driver);
	427	if (ret != 0) {
	428	printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
	429	ret);
	430	}
	431
	432	return ret;
	433	}
	434	module_init(ad1836_init);
	435
	436	static void __exit ad1836_exit(void)
	437	{
	438	spi_unregister_driver(&ad1836_spi_driver);
	439	}
	440	module_exit(ad1836_exit);
	441
	442	MODULE_DESCRIPTION("ASoC ad1836 driver");
	443	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	444	MODULE_LICENSE("GPL");