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ssm2602.c

/*
 * 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 <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"

struct snd_soc_codec_device soc_codec_dev_ssm2602;

/* codec private data */
struct ssm2602_priv {
      unsigned int sysclk;
      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 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]),
};

/* add non dapm controls */
static int ssm2602_add_controls(struct snd_soc_codec *codec)
{
      int err, i;

      for (i = 0; i < ARRAY_SIZE(ssm2602_snd_controls); i++) {
            err = snd_ctl_add(codec->card,
                  snd_soc_cnew(&ssm2602_snd_controls[i], codec, NULL));
            if (err < 0)
                  return err;
      }

      return 0;
}

/* 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));

      snd_soc_dapm_new_widgets(codec);
      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)
{
      u16 srate;
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;
      struct ssm2602_priv *ssm2602 = codec->private_data;
      u16 iface = ssm2602_read_reg_cache(codec, SSM2602_IFACE) & 0xfff3;
      int i = get_coeff(ssm2602->sysclk, params_rate(params));

      /*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_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;
      struct ssm2602_priv *ssm2602 = codec->private_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.
       */
      if (ssm2602->master_substream) {
            master_runtime = ssm2602->master_substream->runtime;
            snd_pcm_hw_constraint_minmax(substream->runtime,
                                   SNDRV_PCM_HW_PARAM_RATE,
                                   master_runtime->rate,
                                   master_runtime->rate);

            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_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->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_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->codec;
      /* deactivate */
      if (!codec->active)
            ssm2602_write(codec, SSM2602_ACTIVE, 0);
}

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 = codec->private_data;
      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 |= 0x0003;
            break;
      case SND_SOC_DAIFMT_DSP_B:
            iface |= 0x0013;
            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_11025 |\
            SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
            SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
            SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
            SNDRV_PCM_RATE_96000)

struct snd_soc_dai ssm2602_dai = {
      .name = "SSM2602",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SSM2602_RATES,
            .formats = SNDRV_PCM_FMTBIT_S32_LE,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SSM2602_RATES,
            .formats = SNDRV_PCM_FMTBIT_S32_LE,},
      .ops = {
            .startup = ssm2602_startup,
            .prepare = ssm2602_pcm_prepare,
            .hw_params = ssm2602_hw_params,
            .shutdown = ssm2602_shutdown,
      },
      .dai_ops = {
            .digital_mute = ssm2602_mute,
            .set_sysclk = ssm2602_set_dai_sysclk,
            .set_fmt = ssm2602_set_dai_fmt,
      }
};
EXPORT_SYMBOL_GPL(ssm2602_dai);

static int ssm2602_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;

      ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int ssm2602_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->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);
      ssm2602_set_bias_level(codec, codec->suspend_bias_level);
      return 0;
}

/*
 * initialise the ssm2602 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int ssm2602_init(struct snd_soc_device *socdev)
{
      struct snd_soc_codec *codec = socdev->codec;
      int reg, ret = 0;

      codec->name = "SSM2602";
      codec->owner = THIS_MODULE;
      codec->read = ssm2602_read_reg_cache;
      codec->write = ssm2602_write;
      codec->set_bias_level = ssm2602_set_bias_level;
      codec->dai = &ssm2602_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = sizeof(ssm2602_reg);
      codec->reg_cache = kmemdup(ssm2602_reg, sizeof(ssm2602_reg),
                              GFP_KERNEL);
      if (codec->reg_cache == NULL)
            return -ENOMEM;

      ssm2602_reset(codec);

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            pr_err("ssm2602: failed to create pcms\n");
            goto pcm_err;
      }
      /*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_ENABLE_MIC_BOOST2 | APANA_SELECT_DAC |
                  APANA_ENABLE_MIC_BOOST);
      ssm2602_write(codec, SSM2602_PWR, 0);

      ssm2602_add_controls(codec);
      ssm2602_add_widgets(codec);
      ret = snd_soc_register_card(socdev);
      if (ret < 0) {
            pr_err("ssm2602: 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 *ssm2602_socdev;

#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 snd_soc_device *socdev = ssm2602_socdev;
      struct snd_soc_codec *codec = socdev->codec;
      int ret;

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

      ret = ssm2602_init(socdev);
      if (ret < 0)
            pr_err("failed to initialise SSM2602\n");

      return ret;
}

static int ssm2602_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 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 I2C Codec",
            .owner = THIS_MODULE,
      },
      .probe = ssm2602_i2c_probe,
      .remove = ssm2602_i2c_remove,
      .id_table = ssm2602_i2c_id,
};

static int ssm2602_add_i2c_device(struct platform_device *pdev,
                          const struct ssm2602_setup_data *setup)
{
      struct i2c_board_info info;
      struct i2c_adapter *adapter;
      struct i2c_client *client;
      int ret;

      ret = i2c_add_driver(&ssm2602_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, "ssm2602", 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(&ssm2602_i2c_driver);
      return -ENODEV;
}
#endif

static int ssm2602_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct ssm2602_setup_data *setup;
      struct snd_soc_codec *codec;
      struct ssm2602_priv *ssm2602;
      int ret = 0;

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

      setup = socdev->codec_data;
      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;

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

      codec->private_data = ssm2602;
      socdev->codec = codec;
      mutex_init(&codec->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      ssm2602_socdev = socdev;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      if (setup->i2c_address) {
            codec->hw_write = (hw_write_t)i2c_master_send;
            ret = ssm2602_add_i2c_device(pdev, setup);
      }
#else
      /* other interfaces */
#endif
      return ret;
}

/* remove everything here */
static int ssm2602_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)
            ssm2602_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(&ssm2602_i2c_driver);
#endif
      kfree(codec->private_data);
      kfree(codec);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_ssm2602 = {
      .probe =    ssm2602_probe,
      .remove =   ssm2602_remove,
      .suspend =  ssm2602_suspend,
      .resume =   ssm2602_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ssm2602);

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

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