sound/soc/codecs/ssm2602.c - kernel/msm-4.9 - Gitiles

 /*
  * File:         sound/soc/codecs/ssm2602.c
  * Author:       Cliff Cai <Cliff.Cai@analog.com>
  *
  * Created:      Tue June 06 2008
  * Description:  Driver for ssm2602 sound chip
  *
  * Modified:
  *               Copyright 2008 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #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/slab.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 "ssm2602.h"

 #define SSM2602_VERSION "0.1"

 /* codec private data */
 struct ssm2602_priv {
 	unsigned int sysclk;
 	enum snd_soc_control_type control_type;
 	void *control_data;
 	struct snd_pcm_substream *master_substream;
 	struct snd_pcm_substream *slave_substream;
 };

 /*
  * ssm2602 register cache
  * We can't read the ssm2602 register space when we are
  * using 2 wire for device control, so we cache them instead.
  * There is no point in caching the reset register
  */
 static const u16 ssm2602_reg[SSM2602_CACHEREGNUM] = {
 	0x0017, 0x0017, 0x0079, 0x0079,
 	0x0000, 0x0000, 0x0000, 0x000a,
 	0x0000, 0x0000
 };

 /*
  * read ssm2602 register cache
  */
 static inline unsigned int ssm2602_read_reg_cache(struct snd_soc_codec *codec,
 	unsigned int reg)
 {
 	u16 *cache = codec->reg_cache;
 	if (reg == SSM2602_RESET)
 		return 0;
 	if (reg >= SSM2602_CACHEREGNUM)
 		return -1;
 	return cache[reg];
 }

 /*
  * write ssm2602 register cache
  */
 static inline void ssm2602_write_reg_cache(struct snd_soc_codec *codec,
 	u16 reg, unsigned int value)
 {
 	u16 *cache = codec->reg_cache;
 	if (reg >= SSM2602_CACHEREGNUM)
 		return;
 	cache[reg] = value;
 }

 /*
  * write to the ssm2602 register space
  */
 static int ssm2602_write(struct snd_soc_codec *codec, unsigned int reg,
 	unsigned int value)
 {
 	u8 data[2];

 	/* data is
 	 *   D15..D9 ssm2602 register offset
 	 *   D8...D0 register data
 	 */
 	data[0] = (reg << 1) | ((value >> 8) & 0x0001);
 	data[1] = value & 0x00ff;

 	ssm2602_write_reg_cache(codec, reg, value);
 	if (codec->hw_write(codec->control_data, data, 2) == 2)
 		return 0;
 	else
 		return -EIO;
 }

 #define ssm2602_reset(c)	ssm2602_write(c, SSM2602_RESET, 0)

 /*Appending several "None"s just for OSS mixer use*/
 static const char *ssm2602_input_select[] = {
 	"Line", "Mic", "None", "None", "None",
 	"None", "None", "None",
 };

 static const char *ssm2602_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};

 static const struct soc_enum ssm2602_enum[] = {
 	SOC_ENUM_SINGLE(SSM2602_APANA, 2, 2, ssm2602_input_select),
 	SOC_ENUM_SINGLE(SSM2602_APDIGI, 1, 4, ssm2602_deemph),
 };

 static const struct snd_kcontrol_new ssm2602_snd_controls[] = {

 SOC_DOUBLE_R("Master Playback Volume", SSM2602_LOUT1V, SSM2602_ROUT1V,
 	0, 127, 0),
 SOC_DOUBLE_R("Master Playback ZC Switch", SSM2602_LOUT1V, SSM2602_ROUT1V,
 	7, 1, 0),

 SOC_DOUBLE_R("Capture Volume", SSM2602_LINVOL, SSM2602_RINVOL, 0, 31, 0),
 SOC_DOUBLE_R("Capture Switch", SSM2602_LINVOL, SSM2602_RINVOL, 7, 1, 1),

 SOC_SINGLE("Mic Boost (+20dB)", SSM2602_APANA, 0, 1, 0),
 SOC_SINGLE("Mic Boost2 (+20dB)", SSM2602_APANA, 7, 1, 0),
 SOC_SINGLE("Mic Switch", SSM2602_APANA, 1, 1, 1),

 SOC_SINGLE("Sidetone Playback Volume", SSM2602_APANA, 6, 3, 1),

 SOC_SINGLE("ADC High Pass Filter Switch", SSM2602_APDIGI, 0, 1, 1),
 SOC_SINGLE("Store DC Offset Switch", SSM2602_APDIGI, 4, 1, 0),

 SOC_ENUM("Capture Source", ssm2602_enum[0]),

 SOC_ENUM("Playback De-emphasis", ssm2602_enum[1]),
 };

 /* Output Mixer */
 static const struct snd_kcontrol_new ssm2602_output_mixer_controls[] = {
 SOC_DAPM_SINGLE("Line Bypass Switch", SSM2602_APANA, 3, 1, 0),
 SOC_DAPM_SINGLE("Mic Sidetone Switch", SSM2602_APANA, 5, 1, 0),
 SOC_DAPM_SINGLE("HiFi Playback Switch", SSM2602_APANA, 4, 1, 0),
 };

 /* Input mux */
 static const struct snd_kcontrol_new ssm2602_input_mux_controls =
 SOC_DAPM_ENUM("Input Select", ssm2602_enum[0]);

 static const struct snd_soc_dapm_widget ssm2602_dapm_widgets[] = {
 SND_SOC_DAPM_MIXER("Output Mixer", SSM2602_PWR, 4, 1,
 	&ssm2602_output_mixer_controls[0],
 	ARRAY_SIZE(ssm2602_output_mixer_controls)),
 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM2602_PWR, 3, 1),
 SND_SOC_DAPM_OUTPUT("LOUT"),
 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 SND_SOC_DAPM_OUTPUT("ROUT"),
 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", SSM2602_PWR, 2, 1),
 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &ssm2602_input_mux_controls),
 SND_SOC_DAPM_PGA("Line Input", SSM2602_PWR, 0, 1, NULL, 0),
 SND_SOC_DAPM_MICBIAS("Mic Bias", SSM2602_PWR, 1, 1),
 SND_SOC_DAPM_INPUT("MICIN"),
 SND_SOC_DAPM_INPUT("RLINEIN"),
 SND_SOC_DAPM_INPUT("LLINEIN"),
 };

 static const struct snd_soc_dapm_route audio_conn[] = {
 	/* output mixer */
 	{"Output Mixer", "Line Bypass Switch", "Line Input"},
 	{"Output Mixer", "HiFi Playback Switch", "DAC"},
 	{"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},

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

 	/* input mux */
 	{"Input Mux", "Line", "Line Input"},
 	{"Input Mux", "Mic", "Mic Bias"},
 	{"ADC", NULL, "Input Mux"},

 	/* inputs */
 	{"Line Input", NULL, "LLINEIN"},
 	{"Line Input", NULL, "RLINEIN"},
 	{"Mic Bias", NULL, "MICIN"},
 };

 static int ssm2602_add_widgets(struct snd_soc_codec *codec)
 {
 	snd_soc_dapm_new_controls(codec, ssm2602_dapm_widgets,
 				  ARRAY_SIZE(ssm2602_dapm_widgets));

 	snd_soc_dapm_add_routes(codec, audio_conn, ARRAY_SIZE(audio_conn));

 	return 0;
 }

 struct _coeff_div {
 	u32 mclk;
 	u32 rate;
 	u16 fs;
 	u8 sr:4;
 	u8 bosr:1;
 	u8 usb:1;
 };

 /* codec mclk clock divider coefficients */
 static const struct _coeff_div coeff_div[] = {
 	/* 48k */
 	{12288000, 48000, 256, 0x0, 0x0, 0x0},
 	{18432000, 48000, 384, 0x0, 0x1, 0x0},
 	{12000000, 48000, 250, 0x0, 0x0, 0x1},

 	/* 32k */
 	{12288000, 32000, 384, 0x6, 0x0, 0x0},
 	{18432000, 32000, 576, 0x6, 0x1, 0x0},
 	{12000000, 32000, 375, 0x6, 0x0, 0x1},

 	/* 8k */
 	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
 	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
 	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
 	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
 	{12000000, 8000, 1500, 0x3, 0x0, 0x1},

 	/* 96k */
 	{12288000, 96000, 128, 0x7, 0x0, 0x0},
 	{18432000, 96000, 192, 0x7, 0x1, 0x0},
 	{12000000, 96000, 125, 0x7, 0x0, 0x1},

 	/* 44.1k */
 	{11289600, 44100, 256, 0x8, 0x0, 0x0},
 	{16934400, 44100, 384, 0x8, 0x1, 0x0},
 	{12000000, 44100, 272, 0x8, 0x1, 0x1},

 	/* 88.2k */
 	{11289600, 88200, 128, 0xf, 0x0, 0x0},
 	{16934400, 88200, 192, 0xf, 0x1, 0x0},
 	{12000000, 88200, 136, 0xf, 0x1, 0x1},
 };

 static inline int get_coeff(int mclk, int rate)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 			return i;
 	}
 	return i;
 }

 static int ssm2602_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params,
 	struct snd_soc_dai *dai)
 {
 	u16 srate;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_codec *codec = rtd->codec;
 	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
 	struct i2c_client *i2c = codec->control_data;
 	u16 iface = ssm2602_read_reg_cache(codec, SSM2602_IFACE) & 0xfff3;
 	int i = get_coeff(ssm2602->sysclk, params_rate(params));

 	if (substream == ssm2602->slave_substream) {
 		dev_dbg(&i2c->dev, "Ignoring hw_params for slave substream\n");
 		return 0;
 	}

 	/*no match is found*/
 	if (i == ARRAY_SIZE(coeff_div))
 		return -EINVAL;

 	srate = (coeff_div[i].sr << 2) |
 		(coeff_div[i].bosr << 1) | coeff_div[i].usb;

 	ssm2602_write(codec, SSM2602_ACTIVE, 0);
 	ssm2602_write(codec, SSM2602_SRATE, srate);

 	/* bit size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		iface |= 0x0004;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		iface |= 0x0008;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		iface |= 0x000c;
 		break;
 	}
 	ssm2602_write(codec, SSM2602_IFACE, iface);
 	ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);
 	return 0;
 }

 static int ssm2602_startup(struct snd_pcm_substream *substream,
 			   struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_codec *codec = rtd->codec;
 	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
 	struct i2c_client *i2c = codec->control_data;
 	struct snd_pcm_runtime *master_runtime;

 	/* The DAI has shared clocks so if we already have a playback or
 	 * capture going then constrain this substream to match it.
 	 * TODO: the ssm2602 allows pairs of non-matching PB/REC rates
 	 */
 	if (ssm2602->master_substream) {
 		master_runtime = ssm2602->master_substream->runtime;
 		dev_dbg(&i2c->dev, "Constraining to %d bits at %dHz\n",
 			master_runtime->sample_bits,
 			master_runtime->rate);

 		if (master_runtime->rate != 0)
 			snd_pcm_hw_constraint_minmax(substream->runtime,
 						     SNDRV_PCM_HW_PARAM_RATE,
 						     master_runtime->rate,
 						     master_runtime->rate);

 		if (master_runtime->sample_bits != 0)
 			snd_pcm_hw_constraint_minmax(substream->runtime,
 						     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
 						     master_runtime->sample_bits,
 						     master_runtime->sample_bits);

 		ssm2602->slave_substream = substream;
 	} else
 		ssm2602->master_substream = substream;

 	return 0;
 }

 static int ssm2602_pcm_prepare(struct snd_pcm_substream *substream,
 			       struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_codec *codec = rtd->codec;
 	/* set active */
 	ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);

 	return 0;
 }

 static void ssm2602_shutdown(struct snd_pcm_substream *substream,
 			     struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_codec *codec = rtd->codec;
 	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);

 	/* deactivate */
 	if (!codec->active)
 		ssm2602_write(codec, SSM2602_ACTIVE, 0);

 	if (ssm2602->master_substream == substream)
 		ssm2602->master_substream = ssm2602->slave_substream;

 	ssm2602->slave_substream = NULL;
 }

 static int ssm2602_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	u16 mute_reg = ssm2602_read_reg_cache(codec, SSM2602_APDIGI) & ~APDIGI_ENABLE_DAC_MUTE;
 	if (mute)
 		ssm2602_write(codec, SSM2602_APDIGI,
 				mute_reg | APDIGI_ENABLE_DAC_MUTE);
 	else
 		ssm2602_write(codec, SSM2602_APDIGI, mute_reg);
 	return 0;
 }

 static int ssm2602_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;
 	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
 	switch (freq) {
 	case 11289600:
 	case 12000000:
 	case 12288000:
 	case 16934400:
 	case 18432000:
 		ssm2602->sysclk = freq;
 		return 0;
 	}
 	return -EINVAL;
 }

 static int ssm2602_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 iface = 0;

 	/* set master/slave audio interface */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		iface |= 0x0040;
 		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 |= 0x0002;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= 0x0001;
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 		iface |= 0x0013;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		iface |= 0x0003;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* clock inversion */
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		iface |= 0x0090;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |= 0x0080;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x0010;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* set iface */
 	ssm2602_write(codec, SSM2602_IFACE, iface);
 	return 0;
 }

 static int ssm2602_set_bias_level(struct snd_soc_codec *codec,
 				 enum snd_soc_bias_level level)
 {
 	u16 reg = ssm2602_read_reg_cache(codec, SSM2602_PWR) & 0xff7f;

 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		/* vref/mid, osc on, dac unmute */
 		ssm2602_write(codec, SSM2602_PWR, reg);
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		/* everything off except vref/vmid, */
 		ssm2602_write(codec, SSM2602_PWR, reg | PWR_CLK_OUT_PDN);
 		break;
 	case SND_SOC_BIAS_OFF:
 		/* everything off, dac mute, inactive */
 		ssm2602_write(codec, SSM2602_ACTIVE, 0);
 		ssm2602_write(codec, SSM2602_PWR, 0xffff);
 		break;

 	}
 	codec->bias_level = level;
 	return 0;
 }

 #define SSM2602_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_32000 |\
 		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
 		SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

 #define SSM2602_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 		SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

 static struct snd_soc_dai_ops ssm2602_dai_ops = {
 	.startup	= ssm2602_startup,
 	.prepare	= ssm2602_pcm_prepare,
 	.hw_params	= ssm2602_hw_params,
 	.shutdown	= ssm2602_shutdown,
 	.digital_mute	= ssm2602_mute,
 	.set_sysclk	= ssm2602_set_dai_sysclk,
 	.set_fmt	= ssm2602_set_dai_fmt,
 };

 static struct snd_soc_dai_driver ssm2602_dai = {
 	.name = "ssm2602-hifi",
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SSM2602_RATES,
 		.formats = SSM2602_FORMATS,},
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SSM2602_RATES,
 		.formats = SSM2602_FORMATS,},
 	.ops = &ssm2602_dai_ops,
 };

 static int ssm2602_suspend(struct snd_soc_codec *codec, pm_message_t state)
 {
 	ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static int ssm2602_resume(struct snd_soc_codec *codec)
 {
 	int i;
 	u8 data[2];
 	u16 *cache = codec->reg_cache;

 	/* Sync reg_cache with the hardware */
 	for (i = 0; i < ARRAY_SIZE(ssm2602_reg); i++) {
 		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 		data[1] = cache[i] & 0x00ff;
 		codec->hw_write(codec->control_data, data, 2);
 	}
 	ssm2602_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 	return 0;
 }

 static int ssm2602_probe(struct snd_soc_codec *codec)
 {
 	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
 	int ret = 0, reg;

 	pr_info("ssm2602 Audio Codec %s", SSM2602_VERSION);

 	codec->bias_level = SND_SOC_BIAS_OFF,
 	codec->control_data = ssm2602->control_data;

 	ssm2602_reset(codec);

 	/*power on device*/
 	ssm2602_write(codec, SSM2602_ACTIVE, 0);
 	/* set the update bits */
 	reg = ssm2602_read_reg_cache(codec, SSM2602_LINVOL);
 	ssm2602_write(codec, SSM2602_LINVOL, reg | LINVOL_LRIN_BOTH);
 	reg = ssm2602_read_reg_cache(codec, SSM2602_RINVOL);
 	ssm2602_write(codec, SSM2602_RINVOL, reg | RINVOL_RLIN_BOTH);
 	reg = ssm2602_read_reg_cache(codec, SSM2602_LOUT1V);
 	ssm2602_write(codec, SSM2602_LOUT1V, reg | LOUT1V_LRHP_BOTH);
 	reg = ssm2602_read_reg_cache(codec, SSM2602_ROUT1V);
 	ssm2602_write(codec, SSM2602_ROUT1V, reg | ROUT1V_RLHP_BOTH);
 	/*select Line in as default input*/
 	ssm2602_write(codec, SSM2602_APANA, APANA_SELECT_DAC |
 			APANA_ENABLE_MIC_BOOST);
 	ssm2602_write(codec, SSM2602_PWR, 0);

 	snd_soc_add_controls(codec, ssm2602_snd_controls,
 				ARRAY_SIZE(ssm2602_snd_controls));
 	ssm2602_add_widgets(codec);

 	return ret;
 }

 /* remove everything here */
 static int ssm2602_remove(struct snd_soc_codec *codec)
 {
 	ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }

 static struct snd_soc_codec_driver soc_codec_dev_ssm2602 = {
 	.probe =	ssm2602_probe,
 	.remove =	ssm2602_remove,
 	.suspend =	ssm2602_suspend,
 	.resume =	ssm2602_resume,
 	.read = ssm2602_read_reg_cache,
 	.write = ssm2602_write,
 	.set_bias_level = ssm2602_set_bias_level,
 	.reg_cache_size = sizeof(ssm2602_reg),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = ssm2602_reg,
 };

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 /*
  * ssm2602 2 wire address is determined by GPIO5
  * state during powerup.
  *    low  = 0x1a
  *    high = 0x1b
  */
 static int ssm2602_i2c_probe(struct i2c_client *i2c,
 			     const struct i2c_device_id *id)
 {
 	struct ssm2602_priv *ssm2602;
 	int ret;

 	ssm2602 = kzalloc(sizeof(struct ssm2602_priv), GFP_KERNEL);
 	if (ssm2602 == NULL)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, ssm2602);
 	ssm2602->control_data = i2c;
 	ssm2602->control_type = SND_SOC_I2C;

 	ret = snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_ssm2602, &ssm2602_dai, 1);
 	if (ret < 0)
 		kfree(ssm2602);
 	return ret;
 }

 static int ssm2602_i2c_remove(struct i2c_client *client)
 {
 	snd_soc_unregister_codec(&client->dev);
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

 static const struct i2c_device_id ssm2602_i2c_id[] = {
 	{ "ssm2602", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ssm2602_i2c_id);

 /* corgi i2c codec control layer */
 static struct i2c_driver ssm2602_i2c_driver = {
 	.driver = {
 		.name = "ssm2602-codec",
 		.owner = THIS_MODULE,
 	},
 	.probe = ssm2602_i2c_probe,
 	.remove = ssm2602_i2c_remove,
 	.id_table = ssm2602_i2c_id,
 };
 #endif


 static int __init ssm2602_modinit(void)
 {
 	int ret = 0;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&ssm2602_i2c_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register SSM2602 I2C driver: %d\n",
 		       ret);
 	}
 #endif
 	return ret;
 }
 module_init(ssm2602_modinit);

 static void __exit ssm2602_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&ssm2602_i2c_driver);
 #endif
 }
 module_exit(ssm2602_exit);

 MODULE_DESCRIPTION("ASoC ssm2602 driver");
 MODULE_AUTHOR("Cliff Cai");
 MODULE_LICENSE("GPL");
	/*
	* File: sound/soc/codecs/ssm2602.c
	* Author: Cliff Cai <Cliff.Cai@analog.com>
	*
	* Created: Tue June 06 2008
	* Description: Driver for ssm2602 sound chip
	*
	* Modified:
	* Copyright 2008 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#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/slab.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 "ssm2602.h"

	#define SSM2602_VERSION "0.1"

	/* codec private data */
	struct ssm2602_priv {
	unsigned int sysclk;
	enum snd_soc_control_type control_type;
	void *control_data;
	struct snd_pcm_substream *master_substream;
	struct snd_pcm_substream *slave_substream;
	};

	/*
	* ssm2602 register cache
	* We can't read the ssm2602 register space when we are
	* using 2 wire for device control, so we cache them instead.
	* There is no point in caching the reset register
	*/
	static const u16 ssm2602_reg[SSM2602_CACHEREGNUM] = {
	0x0017, 0x0017, 0x0079, 0x0079,
	0x0000, 0x0000, 0x0000, 0x000a,
	0x0000, 0x0000
	};

	/*
	* read ssm2602 register cache
	*/
	static inline unsigned int ssm2602_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
	{
	u16 *cache = codec->reg_cache;
	if (reg == SSM2602_RESET)
	return 0;
	if (reg >= SSM2602_CACHEREGNUM)
	return -1;
	return cache[reg];
	}

	/*
	* write ssm2602 register cache
	*/
	static inline void ssm2602_write_reg_cache(struct snd_soc_codec *codec,
	u16 reg, unsigned int value)
	{
	u16 *cache = codec->reg_cache;
	if (reg >= SSM2602_CACHEREGNUM)
	return;
	cache[reg] = value;
	}

	/*
	* write to the ssm2602 register space
	*/
	static int ssm2602_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
	{
	u8 data[2];

	/* data is
	* D15..D9 ssm2602 register offset
	* D8...D0 register data
	*/
	data[0] = (reg << 1) \| ((value >> 8) & 0x0001);
	data[1] = value & 0x00ff;

	ssm2602_write_reg_cache(codec, reg, value);
	if (codec->hw_write(codec->control_data, data, 2) == 2)
	return 0;
	else
	return -EIO;
	}

	#define ssm2602_reset(c) ssm2602_write(c, SSM2602_RESET, 0)

	/Appending several "None"s just for OSS mixer use/
	static const char *ssm2602_input_select[] = {
	"Line", "Mic", "None", "None", "None",
	"None", "None", "None",
	};

	static const char *ssm2602_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};

	static const struct soc_enum ssm2602_enum[] = {
	SOC_ENUM_SINGLE(SSM2602_APANA, 2, 2, ssm2602_input_select),
	SOC_ENUM_SINGLE(SSM2602_APDIGI, 1, 4, ssm2602_deemph),
	};

	static const struct snd_kcontrol_new ssm2602_snd_controls[] = {

	SOC_DOUBLE_R("Master Playback Volume", SSM2602_LOUT1V, SSM2602_ROUT1V,
	0, 127, 0),
	SOC_DOUBLE_R("Master Playback ZC Switch", SSM2602_LOUT1V, SSM2602_ROUT1V,
	7, 1, 0),

	SOC_DOUBLE_R("Capture Volume", SSM2602_LINVOL, SSM2602_RINVOL, 0, 31, 0),
	SOC_DOUBLE_R("Capture Switch", SSM2602_LINVOL, SSM2602_RINVOL, 7, 1, 1),

	SOC_SINGLE("Mic Boost (+20dB)", SSM2602_APANA, 0, 1, 0),
	SOC_SINGLE("Mic Boost2 (+20dB)", SSM2602_APANA, 7, 1, 0),
	SOC_SINGLE("Mic Switch", SSM2602_APANA, 1, 1, 1),

	SOC_SINGLE("Sidetone Playback Volume", SSM2602_APANA, 6, 3, 1),

	SOC_SINGLE("ADC High Pass Filter Switch", SSM2602_APDIGI, 0, 1, 1),
	SOC_SINGLE("Store DC Offset Switch", SSM2602_APDIGI, 4, 1, 0),

	SOC_ENUM("Capture Source", ssm2602_enum[0]),

	SOC_ENUM("Playback De-emphasis", ssm2602_enum[1]),
	};

	/* Output Mixer */
	static const struct snd_kcontrol_new ssm2602_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", SSM2602_APANA, 3, 1, 0),
	SOC_DAPM_SINGLE("Mic Sidetone Switch", SSM2602_APANA, 5, 1, 0),
	SOC_DAPM_SINGLE("HiFi Playback Switch", SSM2602_APANA, 4, 1, 0),
	};

	/* Input mux */
	static const struct snd_kcontrol_new ssm2602_input_mux_controls =
	SOC_DAPM_ENUM("Input Select", ssm2602_enum[0]);

	static const struct snd_soc_dapm_widget ssm2602_dapm_widgets[] = {
	SND_SOC_DAPM_MIXER("Output Mixer", SSM2602_PWR, 4, 1,
	&ssm2602_output_mixer_controls[0],
	ARRAY_SIZE(ssm2602_output_mixer_controls)),
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM2602_PWR, 3, 1),
	SND_SOC_DAPM_OUTPUT("LOUT"),
	SND_SOC_DAPM_OUTPUT("LHPOUT"),
	SND_SOC_DAPM_OUTPUT("ROUT"),
	SND_SOC_DAPM_OUTPUT("RHPOUT"),
	SND_SOC_DAPM_ADC("ADC", "HiFi Capture", SSM2602_PWR, 2, 1),
	SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &ssm2602_input_mux_controls),
	SND_SOC_DAPM_PGA("Line Input", SSM2602_PWR, 0, 1, NULL, 0),
	SND_SOC_DAPM_MICBIAS("Mic Bias", SSM2602_PWR, 1, 1),
	SND_SOC_DAPM_INPUT("MICIN"),
	SND_SOC_DAPM_INPUT("RLINEIN"),
	SND_SOC_DAPM_INPUT("LLINEIN"),
	};

	static const struct snd_soc_dapm_route audio_conn[] = {
	/* output mixer */
	{"Output Mixer", "Line Bypass Switch", "Line Input"},
	{"Output Mixer", "HiFi Playback Switch", "DAC"},
	{"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},

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

	/* input mux */
	{"Input Mux", "Line", "Line Input"},
	{"Input Mux", "Mic", "Mic Bias"},
	{"ADC", NULL, "Input Mux"},

	/* inputs */
	{"Line Input", NULL, "LLINEIN"},
	{"Line Input", NULL, "RLINEIN"},
	{"Mic Bias", NULL, "MICIN"},
	};

	static int ssm2602_add_widgets(struct snd_soc_codec *codec)
	{
	snd_soc_dapm_new_controls(codec, ssm2602_dapm_widgets,
	ARRAY_SIZE(ssm2602_dapm_widgets));

	snd_soc_dapm_add_routes(codec, audio_conn, ARRAY_SIZE(audio_conn));

	return 0;
	}

	struct _coeff_div {
	u32 mclk;
	u32 rate;
	u16 fs;
	u8 sr:4;
	u8 bosr:1;
	u8 usb:1;
	};

	/* codec mclk clock divider coefficients */
	static const struct _coeff_div coeff_div[] = {
	/* 48k */
	{12288000, 48000, 256, 0x0, 0x0, 0x0},
	{18432000, 48000, 384, 0x0, 0x1, 0x0},
	{12000000, 48000, 250, 0x0, 0x0, 0x1},

	/* 32k */
	{12288000, 32000, 384, 0x6, 0x0, 0x0},
	{18432000, 32000, 576, 0x6, 0x1, 0x0},
	{12000000, 32000, 375, 0x6, 0x0, 0x1},

	/* 8k */
	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
	{12000000, 8000, 1500, 0x3, 0x0, 0x1},

	/* 96k */
	{12288000, 96000, 128, 0x7, 0x0, 0x0},
	{18432000, 96000, 192, 0x7, 0x1, 0x0},
	{12000000, 96000, 125, 0x7, 0x0, 0x1},

	/* 44.1k */
	{11289600, 44100, 256, 0x8, 0x0, 0x0},
	{16934400, 44100, 384, 0x8, 0x1, 0x0},
	{12000000, 44100, 272, 0x8, 0x1, 0x1},

	/* 88.2k */
	{11289600, 88200, 128, 0xf, 0x0, 0x0},
	{16934400, 88200, 192, 0xf, 0x1, 0x0},
	{12000000, 88200, 136, 0xf, 0x1, 0x1},
	};

	static inline int get_coeff(int mclk, int rate)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
	if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
	return i;
	}
	return i;
	}

	static int ssm2602_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	u16 srate;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
	struct i2c_client *i2c = codec->control_data;
	u16 iface = ssm2602_read_reg_cache(codec, SSM2602_IFACE) & 0xfff3;
	int i = get_coeff(ssm2602->sysclk, params_rate(params));

	if (substream == ssm2602->slave_substream) {
	dev_dbg(&i2c->dev, "Ignoring hw_params for slave substream\n");
	return 0;
	}

	/no match is found/
	if (i == ARRAY_SIZE(coeff_div))
	return -EINVAL;

	srate = (coeff_div[i].sr << 2) \|
	(coeff_div[i].bosr << 1) \| coeff_div[i].usb;

	ssm2602_write(codec, SSM2602_ACTIVE, 0);
	ssm2602_write(codec, SSM2602_SRATE, srate);

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	iface \|= 0x0004;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	iface \|= 0x0008;
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	iface \|= 0x000c;
	break;
	}
	ssm2602_write(codec, SSM2602_IFACE, iface);
	ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);
	return 0;
	}

	static int ssm2602_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
	struct i2c_client *i2c = codec->control_data;
	struct snd_pcm_runtime *master_runtime;

	/* The DAI has shared clocks so if we already have a playback or
	* capture going then constrain this substream to match it.
	* TODO: the ssm2602 allows pairs of non-matching PB/REC rates
	*/
	if (ssm2602->master_substream) {
	master_runtime = ssm2602->master_substream->runtime;
	dev_dbg(&i2c->dev, "Constraining to %d bits at %dHz\n",
	master_runtime->sample_bits,
	master_runtime->rate);

	if (master_runtime->rate != 0)
	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_RATE,
	master_runtime->rate,
	master_runtime->rate);

	if (master_runtime->sample_bits != 0)
	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
	master_runtime->sample_bits,
	master_runtime->sample_bits);

	ssm2602->slave_substream = substream;
	} else
	ssm2602->master_substream = substream;

	return 0;
	}

	static int ssm2602_pcm_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	/* set active */
	ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);

	return 0;
	}

	static void ssm2602_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);

	/* deactivate */
	if (!codec->active)
	ssm2602_write(codec, SSM2602_ACTIVE, 0);

	if (ssm2602->master_substream == substream)
	ssm2602->master_substream = ssm2602->slave_substream;

	ssm2602->slave_substream = NULL;
	}

	static int ssm2602_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = ssm2602_read_reg_cache(codec, SSM2602_APDIGI) & ~APDIGI_ENABLE_DAC_MUTE;
	if (mute)
	ssm2602_write(codec, SSM2602_APDIGI,
	mute_reg \| APDIGI_ENABLE_DAC_MUTE);
	else
	ssm2602_write(codec, SSM2602_APDIGI, mute_reg);
	return 0;
	}

	static int ssm2602_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;
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
	switch (freq) {
	case 11289600:
	case 12000000:
	case 12288000:
	case 16934400:
	case 18432000:
	ssm2602->sysclk = freq;
	return 0;
	}
	return -EINVAL;
	}

	static int ssm2602_set_dai_fmt(struct snd_soc_dai *codec_dai,
	unsigned int fmt)
	{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	iface \|= 0x0040;
	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 \|= 0x0002;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= 0x0001;
	break;
	case SND_SOC_DAIFMT_DSP_A:
	iface \|= 0x0013;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	iface \|= 0x0003;
	break;
	default:
	return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	case SND_SOC_DAIFMT_IB_IF:
	iface \|= 0x0090;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x0080;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x0010;
	break;
	default:
	return -EINVAL;
	}

	/* set iface */
	ssm2602_write(codec, SSM2602_IFACE, iface);
	return 0;
	}

	static int ssm2602_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	u16 reg = ssm2602_read_reg_cache(codec, SSM2602_PWR) & 0xff7f;

	switch (level) {
	case SND_SOC_BIAS_ON:
	/* vref/mid, osc on, dac unmute */
	ssm2602_write(codec, SSM2602_PWR, reg);
	break;
	case SND_SOC_BIAS_PREPARE:
	break;
	case SND_SOC_BIAS_STANDBY:
	/* everything off except vref/vmid, */
	ssm2602_write(codec, SSM2602_PWR, reg \| PWR_CLK_OUT_PDN);
	break;
	case SND_SOC_BIAS_OFF:
	/* everything off, dac mute, inactive */
	ssm2602_write(codec, SSM2602_ACTIVE, 0);
	ssm2602_write(codec, SSM2602_PWR, 0xffff);
	break;

	}
	codec->bias_level = level;
	return 0;
	}

	#define SSM2602_RATES (SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_32000 \|\
	SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000 \|\
	SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000)

	#define SSM2602_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S32_LE)

	static struct snd_soc_dai_ops ssm2602_dai_ops = {
	.startup = ssm2602_startup,
	.prepare = ssm2602_pcm_prepare,
	.hw_params = ssm2602_hw_params,
	.shutdown = ssm2602_shutdown,
	.digital_mute = ssm2602_mute,
	.set_sysclk = ssm2602_set_dai_sysclk,
	.set_fmt = ssm2602_set_dai_fmt,
	};

	static struct snd_soc_dai_driver ssm2602_dai = {
	.name = "ssm2602-hifi",
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SSM2602_RATES,
	.formats = SSM2602_FORMATS,},
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SSM2602_RATES,
	.formats = SSM2602_FORMATS,},
	.ops = &ssm2602_dai_ops,
	};

	static int ssm2602_suspend(struct snd_soc_codec *codec, pm_message_t state)
	{
	ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static int ssm2602_resume(struct snd_soc_codec *codec)
	{
	int i;
	u8 data[2];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(ssm2602_reg); i++) {
	data[0] = (i << 1) \| ((cache[i] >> 8) & 0x0001);
	data[1] = cache[i] & 0x00ff;
	codec->hw_write(codec->control_data, data, 2);
	}
	ssm2602_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	return 0;
	}

	static int ssm2602_probe(struct snd_soc_codec *codec)
	{
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
	int ret = 0, reg;

	pr_info("ssm2602 Audio Codec %s", SSM2602_VERSION);

	codec->bias_level = SND_SOC_BIAS_OFF,
	codec->control_data = ssm2602->control_data;

	ssm2602_reset(codec);

	/power on device/
	ssm2602_write(codec, SSM2602_ACTIVE, 0);
	/* set the update bits */
	reg = ssm2602_read_reg_cache(codec, SSM2602_LINVOL);
	ssm2602_write(codec, SSM2602_LINVOL, reg \| LINVOL_LRIN_BOTH);
	reg = ssm2602_read_reg_cache(codec, SSM2602_RINVOL);
	ssm2602_write(codec, SSM2602_RINVOL, reg \| RINVOL_RLIN_BOTH);
	reg = ssm2602_read_reg_cache(codec, SSM2602_LOUT1V);
	ssm2602_write(codec, SSM2602_LOUT1V, reg \| LOUT1V_LRHP_BOTH);
	reg = ssm2602_read_reg_cache(codec, SSM2602_ROUT1V);
	ssm2602_write(codec, SSM2602_ROUT1V, reg \| ROUT1V_RLHP_BOTH);
	/select Line in as default input/
	ssm2602_write(codec, SSM2602_APANA, APANA_SELECT_DAC \|
	APANA_ENABLE_MIC_BOOST);
	ssm2602_write(codec, SSM2602_PWR, 0);

	snd_soc_add_controls(codec, ssm2602_snd_controls,
	ARRAY_SIZE(ssm2602_snd_controls));
	ssm2602_add_widgets(codec);

	return ret;
	}

	/* remove everything here */
	static int ssm2602_remove(struct snd_soc_codec *codec)
	{
	ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
	}

	static struct snd_soc_codec_driver soc_codec_dev_ssm2602 = {
	.probe = ssm2602_probe,
	.remove = ssm2602_remove,
	.suspend = ssm2602_suspend,
	.resume = ssm2602_resume,
	.read = ssm2602_read_reg_cache,
	.write = ssm2602_write,
	.set_bias_level = ssm2602_set_bias_level,
	.reg_cache_size = sizeof(ssm2602_reg),
	.reg_word_size = sizeof(u16),
	.reg_cache_default = ssm2602_reg,
	};

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	/*
	* ssm2602 2 wire address is determined by GPIO5
	* state during powerup.
	* low = 0x1a
	* high = 0x1b
	*/
	static int ssm2602_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct ssm2602_priv *ssm2602;
	int ret;

	ssm2602 = kzalloc(sizeof(struct ssm2602_priv), GFP_KERNEL);
	if (ssm2602 == NULL)
	return -ENOMEM;

	i2c_set_clientdata(i2c, ssm2602);
	ssm2602->control_data = i2c;
	ssm2602->control_type = SND_SOC_I2C;

	ret = snd_soc_register_codec(&i2c->dev,
	&soc_codec_dev_ssm2602, &ssm2602_dai, 1);
	if (ret < 0)
	kfree(ssm2602);
	return ret;
	}

	static int ssm2602_i2c_remove(struct i2c_client *client)
	{
	snd_soc_unregister_codec(&client->dev);
	kfree(i2c_get_clientdata(client));
	return 0;
	}

	static const struct i2c_device_id ssm2602_i2c_id[] = {
	{ "ssm2602", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ssm2602_i2c_id);

	/* corgi i2c codec control layer */
	static struct i2c_driver ssm2602_i2c_driver = {
	.driver = {
	.name = "ssm2602-codec",
	.owner = THIS_MODULE,
	},
	.probe = ssm2602_i2c_probe,
	.remove = ssm2602_i2c_remove,
	.id_table = ssm2602_i2c_id,
	};
	#endif


	static int __init ssm2602_modinit(void)
	{
	int ret = 0;
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&ssm2602_i2c_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register SSM2602 I2C driver: %d\n",
	ret);
	}
	#endif
	return ret;
	}
	module_init(ssm2602_modinit);

	static void __exit ssm2602_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&ssm2602_i2c_driver);
	#endif
	}
	module_exit(ssm2602_exit);

	MODULE_DESCRIPTION("ASoC ssm2602 driver");
	MODULE_AUTHOR("Cliff Cai");
	MODULE_LICENSE("GPL");