sound/soc/codecs/tlv320aic23.c

/*
 * ALSA SoC TLV320AIC23 codec driver
 *
 * Author:      Arun KS, <arunks@mistralsolutions.com>
 * Copyright:   (C) 2008 Mistral Solutions Pvt Ltd.,
 *
 * Based on sound/soc/codecs/wm8731.c by Richard Purdie
 *
 * 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.
 *
 * Notes:
 *  The AIC23 is a driver for a low power stereo audio
 *  codec tlv320aic23
 *
 *  The machine layer should disable unsupported inputs/outputs by
 *  snd_soc_dapm_disable_pin(codec, "LHPOUT"), etc.
 */

#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 <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/tlv.h>
#include <sound/initval.h>

#include "tlv320aic23.h"

#define AIC23_VERSION "0.1"

struct tlv320aic23_srate_reg_info {
	u32 sample_rate;
	u8 control;		/* SR3, SR2, SR1, SR0 and BOSR */
	u8 divider;		/* if 0 CLKIN = MCLK, if 1 CLKIN = MCLK/2 */
};

/*
 * AIC23 register cache
 */
static const u16 tlv320aic23_reg[] = {
	0x0097, 0x0097, 0x00F9, 0x00F9,	/* 0 */
	0x001A, 0x0004, 0x0007, 0x0001,	/* 4 */
	0x0020, 0x0000, 0x0000, 0x0000,	/* 8 */
	0x0000, 0x0000, 0x0000, 0x0000,	/* 12 */
};

/*
 * read tlv320aic23 register cache
 */
static inline unsigned int tlv320aic23_read_reg_cache(struct snd_soc_codec
						      *codec, unsigned int reg)
{
	u16 *cache = codec->reg_cache;
	if (reg >= ARRAY_SIZE(tlv320aic23_reg))
		return -1;
	return cache[reg];
}

/*
 * write tlv320aic23 register cache
 */
static inline void tlv320aic23_write_reg_cache(struct snd_soc_codec *codec,
					       u8 reg, u16 value)
{
	u16 *cache = codec->reg_cache;
	if (reg >= ARRAY_SIZE(tlv320aic23_reg))
		return;
	cache[reg] = value;
}

/*
 * write to the tlv320aic23 register space
 */
static int tlv320aic23_write(struct snd_soc_codec *codec, unsigned int reg,
			     unsigned int value)
{

	u8 data;

	/* TLV320AIC23 has 7 bit address and 9 bits of data
	 * so we need to switch one data bit into reg and rest
	 * of data into val
	 */

	if ((reg < 0 || reg > 9) && (reg != 15)) {
		printk(KERN_WARNING "%s Invalid register R%d\n", __func__, reg);
		return -1;
	}

	data = (reg << 1) | (value >> 8 & 0x01);

	tlv320aic23_write_reg_cache(codec, reg, value);

	if (codec->hw_write(codec->control_data, data,
			    (value & 0xff)) == 0)
		return 0;

	printk(KERN_ERR "%s cannot write %03x to register R%d\n", __func__,
	       value, reg);

	return -EIO;
}

static const char *rec_src_text[] = { "Line", "Mic" };
static const char *deemph_text[] = {"None", "32Khz", "44.1Khz", "48Khz"};

static const struct soc_enum rec_src_enum =
	SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);

static const struct snd_kcontrol_new tlv320aic23_rec_src_mux_controls =
SOC_DAPM_ENUM("Input Select", rec_src_enum);

static const struct soc_enum tlv320aic23_rec_src =
	SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);
static const struct soc_enum tlv320aic23_deemph =
	SOC_ENUM_SINGLE(TLV320AIC23_DIGT, 1, 4, deemph_text);

static const DECLARE_TLV_DB_SCALE(out_gain_tlv, -12100, 100, 0);
static const DECLARE_TLV_DB_SCALE(input_gain_tlv, -1725, 75, 0);
static const DECLARE_TLV_DB_SCALE(sidetone_vol_tlv, -1800, 300, 0);

static int snd_soc_tlv320aic23_put_volsw(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	u16 val, reg;

	val = (ucontrol->value.integer.value[0] & 0x07);

	/* linear conversion to userspace
	* 000	=	-6db
	* 001	=	-9db
	* 010	=	-12db
	* 011	=	-18db (Min)
	* 100	=	0db (Max)
	*/
	val = (val >= 4) ? 4  : (3 - val);

	reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG) & (~0x1C0);
	tlv320aic23_write(codec, TLV320AIC23_ANLG, reg | (val << 6));

	return 0;
}

static int snd_soc_tlv320aic23_get_volsw(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	u16 val;

	val = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG) & (0x1C0);
	val = val >> 6;
	val = (val >= 4) ? 4  : (3 -  val);
	ucontrol->value.integer.value[0] = val;
	return 0;

}

#define SOC_TLV320AIC23_SINGLE_TLV(xname, reg, shift, max, invert, tlv_array) \
{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
	.access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
		 SNDRV_CTL_ELEM_ACCESS_READWRITE,\
	.tlv.p = (tlv_array), \
	.info = snd_soc_info_volsw, .get = snd_soc_tlv320aic23_get_volsw,\
	.put = snd_soc_tlv320aic23_put_volsw, \
	.private_value =  SOC_SINGLE_VALUE(reg, shift, max, invert) }

static const struct snd_kcontrol_new tlv320aic23_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Digital Playback Volume", TLV320AIC23_LCHNVOL,
			 TLV320AIC23_RCHNVOL, 0, 127, 0, out_gain_tlv),
	SOC_SINGLE("Digital Playback Switch", TLV320AIC23_DIGT, 3, 1, 1),
	SOC_DOUBLE_R("Line Input Switch", TLV320AIC23_LINVOL,
		     TLV320AIC23_RINVOL, 7, 1, 0),
	SOC_DOUBLE_R_TLV("Line Input Volume", TLV320AIC23_LINVOL,
			 TLV320AIC23_RINVOL, 0, 31, 0, input_gain_tlv),
	SOC_SINGLE("Mic Input Switch", TLV320AIC23_ANLG, 1, 1, 1),
	SOC_SINGLE("Mic Booster Switch", TLV320AIC23_ANLG, 0, 1, 0),
	SOC_TLV320AIC23_SINGLE_TLV("Sidetone Volume", TLV320AIC23_ANLG,
				  6, 4, 0, sidetone_vol_tlv),
	SOC_ENUM("Playback De-emphasis", tlv320aic23_deemph),
};

/* add non dapm controls */
static int tlv320aic23_add_controls(struct snd_soc_codec *codec)
{

	int err, i;

	for (i = 0; i < ARRAY_SIZE(tlv320aic23_snd_controls); i++) {
		err = snd_ctl_add(codec->card,
				  snd_soc_cnew(&tlv320aic23_snd_controls[i],
					       codec, NULL));
		if (err < 0)
			return err;
	}

	return 0;

}

/* PGA Mixer controls for Line and Mic switch */
static const struct snd_kcontrol_new tlv320aic23_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", TLV320AIC23_ANLG, 3, 1, 0),
	SOC_DAPM_SINGLE("Mic Sidetone Switch", TLV320AIC23_ANLG, 5, 1, 0),
	SOC_DAPM_SINGLE("Playback Switch", TLV320AIC23_ANLG, 4, 1, 0),
};

static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", "Playback", TLV320AIC23_PWR, 3, 1),
	SND_SOC_DAPM_ADC("ADC", "Capture", TLV320AIC23_PWR, 2, 1),
	SND_SOC_DAPM_MUX("Capture Source", SND_SOC_NOPM, 0, 0,
			 &tlv320aic23_rec_src_mux_controls),
	SND_SOC_DAPM_MIXER("Output Mixer", TLV320AIC23_PWR, 4, 1,
			   &tlv320aic23_output_mixer_controls[0],
			   ARRAY_SIZE(tlv320aic23_output_mixer_controls)),
	SND_SOC_DAPM_PGA("Line Input", TLV320AIC23_PWR, 0, 1, NULL, 0),
	SND_SOC_DAPM_PGA("Mic Input", TLV320AIC23_PWR, 1, 1, NULL, 0),

	SND_SOC_DAPM_OUTPUT("LHPOUT"),
	SND_SOC_DAPM_OUTPUT("RHPOUT"),
	SND_SOC_DAPM_OUTPUT("LOUT"),
	SND_SOC_DAPM_OUTPUT("ROUT"),

	SND_SOC_DAPM_INPUT("LLINEIN"),
	SND_SOC_DAPM_INPUT("RLINEIN"),

	SND_SOC_DAPM_INPUT("MICIN"),
};

static const struct snd_soc_dapm_route intercon[] = {
	/* Output Mixer */
	{"Output Mixer", "Line Bypass Switch", "Line Input"},
	{"Output Mixer", "Playback Switch", "DAC"},
	{"Output Mixer", "Mic Sidetone Switch", "Mic Input"},

	/* Outputs */
	{"RHPOUT", NULL, "Output Mixer"},
	{"LHPOUT", NULL, "Output Mixer"},
	{"LOUT", NULL, "Output Mixer"},
	{"ROUT", NULL, "Output Mixer"},

	/* Inputs */
	{"Line Input", "NULL", "LLINEIN"},
	{"Line Input", "NULL", "RLINEIN"},

	{"Mic Input", "NULL", "MICIN"},

	/* input mux */
	{"Capture Source", "Line", "Line Input"},
	{"Capture Source", "Mic", "Mic Input"},
	{"ADC", NULL, "Capture Source"},

};

/* tlv320aic23 related */
static const struct tlv320aic23_srate_reg_info srate_reg_info[] = {
	{4000, 0x06, 1},	/*  4000 */
	{8000, 0x06, 0},	/*  8000 */
	{16000, 0x0C, 1},	/* 16000 */
	{22050, 0x11, 1},	/* 22050 */
	{24000, 0x00, 1},	/* 24000 */
	{32000, 0x0C, 0},	/* 32000 */
	{44100, 0x11, 0},	/* 44100 */
	{48000, 0x00, 0},	/* 48000 */
	{88200, 0x1F, 0},	/* 88200 */
	{96000, 0x0E, 0},	/* 96000 */
};

static int tlv320aic23_add_widgets(struct snd_soc_codec *codec)
{
	snd_soc_dapm_new_controls(codec, tlv320aic23_dapm_widgets,
				  ARRAY_SIZE(tlv320aic23_dapm_widgets));

	/* set up audio path interconnects */
	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

	snd_soc_dapm_new_widgets(codec);
	return 0;
}

static int tlv320aic23_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 iface_reg, data;
	u8 count = 0;

	iface_reg =
	    tlv320aic23_read_reg_cache(codec,
				       TLV320AIC23_DIGT_FMT) & ~(0x03 << 2);

	/* Search for the right sample rate */
	/* Verify what happens if the rate is not supported
	 * now it goes to 96Khz */
	while ((srate_reg_info[count].sample_rate != params_rate(params)) &&
	       (count < ARRAY_SIZE(srate_reg_info))) {
		count++;
	}

	data =  (srate_reg_info[count].divider << TLV320AIC23_CLKIN_SHIFT) |
		(srate_reg_info[count]. control << TLV320AIC23_BOSR_SHIFT) |
		TLV320AIC23_USB_CLK_ON;

	tlv320aic23_write(codec, TLV320AIC23_SRATE, data);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface_reg |= (0x01 << 2);
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface_reg |= (0x02 << 2);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		iface_reg |= (0x03 << 2);
		break;
	}
	tlv320aic23_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);

	return 0;
}

static int tlv320aic23_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->codec;

	/* set active */
	tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0001);

	return 0;
}

static void tlv320aic23_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->codec;

	/* deactivate */
	if (!codec->active) {
		udelay(50);
		tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
	}
}

static int tlv320aic23_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u16 reg;

	reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_DIGT);
	if (mute)
		reg |= TLV320AIC23_DACM_MUTE;

	else
		reg &= ~TLV320AIC23_DACM_MUTE;

	tlv320aic23_write(codec, TLV320AIC23_DIGT, reg);

	return 0;
}

static int tlv320aic23_set_dai_fmt(struct snd_soc_dai *codec_dai,
				   unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface_reg;

	iface_reg =
	    tlv320aic23_read_reg_cache(codec, TLV320AIC23_DIGT_FMT) & (~0x03);

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		iface_reg |= TLV320AIC23_MS_MASTER;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;

	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		iface_reg |= TLV320AIC23_FOR_I2S;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface_reg |= TLV320AIC23_FOR_DSP;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface_reg |= TLV320AIC23_FOR_LJUST;
		break;
	default:
		return -EINVAL;

	}

	tlv320aic23_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);

	return 0;
}

static int tlv320aic23_set_dai_sysclk(struct snd_soc_dai *codec_dai,
				      int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;

	switch (freq) {
	case 12000000:
		return 0;
	}
	return -EINVAL;
}

static int tlv320aic23_set_bias_level(struct snd_soc_codec *codec,
				      enum snd_soc_bias_level level)
{
	u16 reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_PWR) & 0xff7f;

	switch (level) {
	case SND_SOC_BIAS_ON:
		/* vref/mid, osc on, dac unmute */
		tlv320aic23_write(codec, TLV320AIC23_PWR, reg);
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		/* everything off except vref/vmid, */
		tlv320aic23_write(codec, TLV320AIC23_PWR, reg | 0x0040);
		break;
	case SND_SOC_BIAS_OFF:
		/* everything off, dac mute, inactive */
		tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
		tlv320aic23_write(codec, TLV320AIC23_PWR, 0xffff);
		break;
	}
	codec->bias_level = level;
	return 0;
}

#define AIC23_RATES	SNDRV_PCM_RATE_8000_96000
#define AIC23_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
			 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)

struct snd_soc_dai tlv320aic23_dai = {
	.name = "tlv320aic23",
	.playback = {
		     .stream_name = "Playback",
		     .channels_min = 2,
		     .channels_max = 2,
		     .rates = AIC23_RATES,
		     .formats = AIC23_FORMATS,},
	.capture = {
		    .stream_name = "Capture",
		    .channels_min = 2,
		    .channels_max = 2,
		    .rates = AIC23_RATES,
		    .formats = AIC23_FORMATS,},
	.ops = {
		.prepare = tlv320aic23_pcm_prepare,
		.hw_params = tlv320aic23_hw_params,
		.shutdown = tlv320aic23_shutdown,
		},
	.dai_ops = {
		    .digital_mute = tlv320aic23_mute,
		    .set_fmt = tlv320aic23_set_dai_fmt,
		    .set_sysclk = tlv320aic23_set_dai_sysclk,
		    }
};
EXPORT_SYMBOL_GPL(tlv320aic23_dai);

static int tlv320aic23_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;

	tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
	tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
}

static int tlv320aic23_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;
	int i;
	u16 reg;

	/* Sync reg_cache with the hardware */
	for (reg = 0; reg < ARRAY_SIZE(tlv320aic23_reg); i++) {
		u16 val = tlv320aic23_read_reg_cache(codec, reg);
		tlv320aic23_write(codec, reg, val);
	}

	tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	tlv320aic23_set_bias_level(codec, codec->suspend_bias_level);

	return 0;
}

/*
 * initialise the AIC23 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int tlv320aic23_init(struct snd_soc_device *socdev)
{
	struct snd_soc_codec *codec = socdev->codec;
	int ret = 0;
	u16 reg;

	codec->name = "tlv320aic23";
	codec->owner = THIS_MODULE;
	codec->read = tlv320aic23_read_reg_cache;
	codec->write = tlv320aic23_write;
	codec->set_bias_level = tlv320aic23_set_bias_level;
	codec->dai = &tlv320aic23_dai;
	codec->num_dai = 1;
	codec->reg_cache_size = ARRAY_SIZE(tlv320aic23_reg);
	codec->reg_cache =
	    kmemdup(tlv320aic23_reg, sizeof(tlv320aic23_reg), GFP_KERNEL);
	if (codec->reg_cache == NULL)
		return -ENOMEM;

	/* Reset codec */
	tlv320aic23_write(codec, TLV320AIC23_RESET, 0);

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		printk(KERN_ERR "tlv320aic23: failed to create pcms\n");
		goto pcm_err;
	}

	/* power on device */
	tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	tlv320aic23_write(codec, TLV320AIC23_DIGT, TLV320AIC23_DEEMP_44K);

	/* Unmute input */
	reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_LINVOL);
	tlv320aic23_write(codec, TLV320AIC23_LINVOL,
			  (reg & (~TLV320AIC23_LIM_MUTED)) |
			  (TLV320AIC23_LRS_ENABLED));

	reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_RINVOL);
	tlv320aic23_write(codec, TLV320AIC23_RINVOL,
			  (reg & (~TLV320AIC23_LIM_MUTED)) |
			  TLV320AIC23_LRS_ENABLED);

	reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG);
	tlv320aic23_write(codec, TLV320AIC23_ANLG,
			 (reg) & (~TLV320AIC23_BYPASS_ON) &
			 (~TLV320AIC23_MICM_MUTED));

	/* Default output volume */
	tlv320aic23_write(codec, TLV320AIC23_LCHNVOL,
			  TLV320AIC23_DEFAULT_OUT_VOL &
			  TLV320AIC23_OUT_VOL_MASK);
	tlv320aic23_write(codec, TLV320AIC23_RCHNVOL,
			  TLV320AIC23_DEFAULT_OUT_VOL &
			  TLV320AIC23_OUT_VOL_MASK);

	tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x1);

	tlv320aic23_add_controls(codec);
	tlv320aic23_add_widgets(codec);
	ret = snd_soc_register_card(socdev);
	if (ret < 0) {
		printk(KERN_ERR "tlv320aic23: 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 *tlv320aic23_socdev;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
/*
 * If the i2c layer weren't so broken, we could pass this kind of data
 * around
 */
static int tlv320aic23_codec_probe(struct i2c_client *i2c,
				   const struct i2c_device_id *i2c_id)
{
	struct snd_soc_device *socdev = tlv320aic23_socdev;
	struct snd_soc_codec *codec = socdev->codec;
	int ret;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -EINVAL;

	i2c_set_clientdata(i2c, codec);
	codec->control_data = i2c;

	ret = tlv320aic23_init(socdev);
	if (ret < 0) {
		printk(KERN_ERR "tlv320aic23: failed to initialise AIC23\n");
		goto err;
	}
	return ret;

err:
	kfree(codec);
	kfree(i2c);
	return ret;
}
static int __exit tlv320aic23_i2c_remove(struct i2c_client *i2c)
{
	put_device(&i2c->dev);
	return 0;
}

static const struct i2c_device_id tlv320aic23_id[] = {
	{"tlv320aic23", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, tlv320aic23_id);

static struct i2c_driver tlv320aic23_i2c_driver = {
	.driver = {
		   .name = "tlv320aic23",
		   },
	.probe = tlv320aic23_codec_probe,
	.remove = __exit_p(tlv320aic23_i2c_remove),
	.id_table = tlv320aic23_id,
};

#endif

static int tlv320aic23_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	printk(KERN_INFO "AIC23 Audio Codec %s\n", AIC23_VERSION);

	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);

	tlv320aic23_socdev = socdev;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
	codec->hw_write = (hw_write_t) i2c_smbus_write_byte_data;
	codec->hw_read = NULL;
	ret = i2c_add_driver(&tlv320aic23_i2c_driver);
	if (ret != 0)
		printk(KERN_ERR "can't add i2c driver");
#endif
	return ret;
}

static int tlv320aic23_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)
		tlv320aic23_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_del_driver(&tlv320aic23_i2c_driver);
#endif
	kfree(codec->reg_cache);
	kfree(codec);

	return 0;
}
struct snd_soc_codec_device soc_codec_dev_tlv320aic23 = {
	.probe = tlv320aic23_probe,
	.remove = tlv320aic23_remove,
	.suspend = tlv320aic23_suspend,
	.resume = tlv320aic23_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320aic23);

MODULE_DESCRIPTION("ASoC TLV320AIC23 codec driver");
MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
MODULE_LICENSE("GPL");