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neo1973_wm8753.c

/*
 * neo1973_wm8753.c  --  SoC audio for Neo1973
 *
 * Copyright 2007 Wolfson Microelectronics PLC.
 * Author: Graeme Gregory
 *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 *  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.
 *
 *  Revision history
 *    20th Jan 2007   Initial version.
 *    05th Feb 2007   Rename all to Neo1973
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include <asm/mach-types.h>
#include <asm/hardware/scoop.h>
#include <asm/arch/regs-iis.h>
#include <asm/arch/regs-clock.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#include <asm/arch/audio.h>
#include <asm/io.h>
#include <asm/arch/spi-gpio.h>
#include "../codecs/wm8753.h"
#include "lm4857.h"
#include "s3c24xx-pcm.h"
#include "s3c24xx-i2s.h"

/* define the scenarios */
#define NEO_AUDIO_OFF               0
#define NEO_GSM_CALL_AUDIO_HANDSET  1
#define NEO_GSM_CALL_AUDIO_HEADSET  2
#define NEO_GSM_CALL_AUDIO_BLUETOOTH      3
#define NEO_STEREO_TO_SPEAKERS            4
#define NEO_STEREO_TO_HEADPHONES    5
#define NEO_CAPTURE_HANDSET         6
#define NEO_CAPTURE_HEADSET         7
#define NEO_CAPTURE_BLUETOOTH       8

static struct snd_soc_machine neo1973;
static struct i2c_client *i2c;

static int neo1973_hifi_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_codec_dai *codec_dai = rtd->dai->codec_dai;
      struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
      unsigned int pll_out = 0, bclk = 0;
      int ret = 0;
      unsigned long iis_clkrate;

      iis_clkrate = s3c24xx_i2s_get_clockrate();

      switch (params_rate(params)) {
      case 8000:
      case 16000:
            pll_out = 12288000;
            break;
      case 48000:
            bclk = WM8753_BCLK_DIV_4;
            pll_out = 12288000;
            break;
      case 96000:
            bclk = WM8753_BCLK_DIV_2;
            pll_out = 12288000;
            break;
      case 11025:
            bclk = WM8753_BCLK_DIV_16;
            pll_out = 11289600;
            break;
      case 22050:
            bclk = WM8753_BCLK_DIV_8;
            pll_out = 11289600;
            break;
      case 44100:
            bclk = WM8753_BCLK_DIV_4;
            pll_out = 11289600;
            break;
      case 88200:
            bclk = WM8753_BCLK_DIV_2;
            pll_out = 11289600;
            break;
      }

      /* set codec DAI configuration */
      ret = codec_dai->dai_ops.set_fmt(codec_dai,
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_CBM_CFM);
      if (ret < 0)
            return ret;

      /* set cpu DAI configuration */
      ret = cpu_dai->dai_ops.set_fmt(cpu_dai,
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_CBM_CFM);
      if (ret < 0)
            return ret;

      /* set the codec system clock for DAC and ADC */
      ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8753_MCLK, pll_out,
            SND_SOC_CLOCK_IN);
      if (ret < 0)
            return ret;

      /* set MCLK division for sample rate */
      ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
            S3C2410_IISMOD_32FS );
      if (ret < 0)
            return ret;

      /* set codec BCLK division for sample rate */
      ret = codec_dai->dai_ops.set_clkdiv(codec_dai, WM8753_BCLKDIV, bclk);
      if (ret < 0)
            return ret;

      /* set prescaler division for sample rate */
      ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
            S3C24XX_PRESCALE(4,4));
      if (ret < 0)
            return ret;

      /* codec PLL input is PCLK/4 */
      ret = codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL1,
            iis_clkrate / 4, pll_out);
      if (ret < 0)
            return ret;

      return 0;
}

static int neo1973_hifi_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;

      /* disable the PLL */
      return codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL1, 0, 0);
}

/*
 * Neo1973 WM8753 HiFi DAI opserations.
 */
static struct snd_soc_ops neo1973_hifi_ops = {
      .hw_params = neo1973_hifi_hw_params,
      .hw_free = neo1973_hifi_hw_free,
};

static int neo1973_voice_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_codec_dai *codec_dai = rtd->dai->codec_dai;
      unsigned int pcmdiv = 0;
      int ret = 0;
      unsigned long iis_clkrate;

      iis_clkrate = s3c24xx_i2s_get_clockrate();

      if (params_rate(params) != 8000)
            return -EINVAL;
      if (params_channels(params) != 1)
            return -EINVAL;

      pcmdiv = WM8753_PCM_DIV_6; /* 2.048 MHz */

      /* todo: gg check mode (DSP_B) against CSR datasheet */
      /* set codec DAI configuration */
      ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* set the codec system clock for DAC and ADC */
      ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8753_PCMCLK, 12288000,
            SND_SOC_CLOCK_IN);
      if (ret < 0)
            return ret;

      /* set codec PCM division for sample rate */
      ret = codec_dai->dai_ops.set_clkdiv(codec_dai, WM8753_PCMDIV, pcmdiv);
      if (ret < 0)
            return ret;

      /* configue and enable PLL for 12.288MHz output */
      ret = codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL2,
            iis_clkrate / 4, 12288000);
      if (ret < 0)
            return ret;

      return 0;
}

static int neo1973_voice_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;

      /* disable the PLL */
      return codec_dai->dai_ops.set_pll(codec_dai, WM8753_PLL2, 0, 0);
}

static struct snd_soc_ops neo1973_voice_ops = {
      .hw_params = neo1973_voice_hw_params,
      .hw_free = neo1973_voice_hw_free,
};

static int neo1973_scenario = 0;

static int neo1973_get_scenario(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      ucontrol->value.integer.value[0] = neo1973_scenario;
      return 0;
}

static int set_scenario_endpoints(struct snd_soc_codec *codec, int scenario)
{
      switch(neo1973_scenario) {
      case NEO_AUDIO_OFF:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_GSM_CALL_AUDIO_HANDSET:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     1);
            break;
      case NEO_GSM_CALL_AUDIO_HEADSET:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  1);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_GSM_CALL_AUDIO_BLUETOOTH:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  1);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_STEREO_TO_SPEAKERS:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_STEREO_TO_HEADPHONES:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    1);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_CAPTURE_HANDSET:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     1);
            break;
      case NEO_CAPTURE_HEADSET:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  1);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      case NEO_CAPTURE_BLUETOOTH:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
            break;
      default:
            snd_soc_dapm_set_endpoint(codec, "Audio Out",    0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line Out", 0);
            snd_soc_dapm_set_endpoint(codec, "GSM Line In",  0);
            snd_soc_dapm_set_endpoint(codec, "Headset Mic",  0);
            snd_soc_dapm_set_endpoint(codec, "Call Mic",     0);
      }

      snd_soc_dapm_sync_endpoints(codec);

      return 0;
}

static int neo1973_set_scenario(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);

      if (neo1973_scenario == ucontrol->value.integer.value[0])
            return 0;

      neo1973_scenario = ucontrol->value.integer.value[0];
      set_scenario_endpoints(codec, neo1973_scenario);
      return 1;
}

static u8 lm4857_regs[4] = {0x00, 0x40, 0x80, 0xC0};

static void lm4857_write_regs(void)
{
      if (i2c_master_send(i2c, lm4857_regs, 4) != 4)
            printk(KERN_ERR "lm4857: i2c write failed\n");
}

static int lm4857_get_reg(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      int reg=kcontrol->private_value & 0xFF;
      int shift = (kcontrol->private_value >> 8) & 0x0F;
      int mask = (kcontrol->private_value >> 16) & 0xFF;

      ucontrol->value.integer.value[0] = (lm4857_regs[reg] >> shift) & mask;
      return 0;
}

static int lm4857_set_reg(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      int reg = kcontrol->private_value & 0xFF;
      int shift = (kcontrol->private_value >> 8) & 0x0F;
      int mask = (kcontrol->private_value >> 16) & 0xFF;

      if (((lm4857_regs[reg] >> shift ) & mask) ==
            ucontrol->value.integer.value[0])
            return 0;

      lm4857_regs[reg] &= ~ (mask << shift);
      lm4857_regs[reg] |= ucontrol->value.integer.value[0] << shift;
      lm4857_write_regs();
      return 1;
}

static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      u8 value = lm4857_regs[LM4857_CTRL] & 0x0F;

      if (value)
            value -= 5;

      ucontrol->value.integer.value[0] = value;
      return 0;
}

static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      u8 value = ucontrol->value.integer.value[0];

      if (value)
            value += 5;

      if ((lm4857_regs[LM4857_CTRL] & 0x0F) == value)
            return 0;

      lm4857_regs[LM4857_CTRL] &= 0xF0;
      lm4857_regs[LM4857_CTRL] |= value;
      lm4857_write_regs();
      return 1;
}

static const struct snd_soc_dapm_widget wm8753_dapm_widgets[] = {
      SND_SOC_DAPM_LINE("Audio Out", NULL),
      SND_SOC_DAPM_LINE("GSM Line Out", NULL),
      SND_SOC_DAPM_LINE("GSM Line In", NULL),
      SND_SOC_DAPM_MIC("Headset Mic", NULL),
      SND_SOC_DAPM_MIC("Call Mic", NULL),
};


/* example machine audio_mapnections */
static const char* audio_map[][3] = {

      /* Connections to the lm4857 amp */
      {"Audio Out", NULL, "LOUT1"},
      {"Audio Out", NULL, "ROUT1"},

      /* Connections to the GSM Module */
      {"GSM Line Out", NULL, "MONO1"},
      {"GSM Line Out", NULL, "MONO2"},
      {"RXP", NULL, "GSM Line In"},
      {"RXN", NULL, "GSM Line In"},

      /* Connections to Headset */
      {"MIC1", NULL, "Mic Bias"},
      {"Mic Bias", NULL, "Headset Mic"},

      /* Call Mic */
      {"MIC2", NULL, "Mic Bias"},
      {"MIC2N", NULL, "Mic Bias"},
      {"Mic Bias", NULL, "Call Mic"},

      /* Connect the ALC pins */
      {"ACIN", NULL, "ACOP"},

      {NULL, NULL, NULL},
};

static const char *lm4857_mode[] = {
      "Off",
      "Call Speaker",
      "Stereo Speakers",
      "Stereo Speakers + Headphones",
      "Headphones"
};

static const struct soc_enum lm4857_mode_enum[] = {
      SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode),
};

static const char *neo_scenarios[] = {
      "Off",
      "GSM Handset",
      "GSM Headset",
      "GSM Bluetooth",
      "Speakers",
      "Headphones",
      "Capture Handset",
      "Capture Headset",
      "Capture Bluetooth"
};

static const struct soc_enum neo_scenario_enum[] = {
      SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(neo_scenarios),neo_scenarios),
};

static const struct snd_kcontrol_new wm8753_neo1973_controls[] = {
      SOC_SINGLE_EXT("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_SINGLE_EXT("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_SINGLE_EXT("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_ENUM_EXT("Amp Mode", lm4857_mode_enum[0],
            lm4857_get_mode, lm4857_set_mode),
      SOC_ENUM_EXT("Neo Mode", neo_scenario_enum[0],
            neo1973_get_scenario, neo1973_set_scenario),
      SOC_SINGLE_EXT("Amp Spk 3D Playback Switch", LM4857_LVOL, 5, 1, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_SINGLE_EXT("Amp HP 3d Playback Switch", LM4857_RVOL, 5, 1, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_SINGLE_EXT("Amp Fast Wakeup Playback Switch", LM4857_CTRL, 5, 1, 0,
            lm4857_get_reg, lm4857_set_reg),
      SOC_SINGLE_EXT("Amp Earpiece 6dB Playback Switch", LM4857_CTRL, 4, 1, 0,
            lm4857_get_reg, lm4857_set_reg),
};

/*
 * This is an example machine initialisation for a wm8753 connected to a
 * neo1973 II. It is missing logic to detect hp/mic insertions and logic
 * to re-route the audio in such an event.
 */
static int neo1973_wm8753_init(struct snd_soc_codec *codec)
{
      int i, err;

      /* set up NC codec pins */
      snd_soc_dapm_set_endpoint(codec, "LOUT2", 0);
      snd_soc_dapm_set_endpoint(codec, "ROUT2", 0);
      snd_soc_dapm_set_endpoint(codec, "OUT3",  0);
      snd_soc_dapm_set_endpoint(codec, "OUT4",  0);
      snd_soc_dapm_set_endpoint(codec, "LINE1", 0);
      snd_soc_dapm_set_endpoint(codec, "LINE2", 0);


      /* set endpoints to default mode */
      set_scenario_endpoints(codec, NEO_AUDIO_OFF);

      /* Add neo1973 specific widgets */
      for (i = 0; i < ARRAY_SIZE(wm8753_dapm_widgets); i++)
            snd_soc_dapm_new_control(codec, &wm8753_dapm_widgets[i]);

      /* add neo1973 specific controls */
      for (i = 0; i < ARRAY_SIZE(wm8753_neo1973_controls); i++) {
            err = snd_ctl_add(codec->card,
                        snd_soc_cnew(&wm8753_neo1973_controls[i],
                        codec, NULL));
            if (err < 0)
                  return err;
      }

      /* set up neo1973 specific audio path audio_mapnects */
      for (i = 0; audio_map[i][0] != NULL; i++) {
            snd_soc_dapm_connect_input(codec, audio_map[i][0],
                  audio_map[i][1], audio_map[i][2]);
      }

      snd_soc_dapm_sync_endpoints(codec);
      return 0;
}

/*
 * BT Codec DAI
 */
static struct snd_soc_cpu_dai bt_dai =
{     .name = "Bluetooth",
      .id = 0,
      .type = SND_SOC_DAI_PCM,
      .playback = {
            .channels_min = 1,
            .channels_max = 1,
            .rates = SNDRV_PCM_RATE_8000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
      .capture = {
            .channels_min = 1,
            .channels_max = 1,
            .rates = SNDRV_PCM_RATE_8000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
};

static struct snd_soc_dai_link neo1973_dai[] = {
{ /* Hifi Playback - for similatious use with voice below */
      .name = "WM8753",
      .stream_name = "WM8753 HiFi",
      .cpu_dai = &s3c24xx_i2s_dai,
      .codec_dai = &wm8753_dai[WM8753_DAI_HIFI],
      .init = neo1973_wm8753_init,
      .ops = &neo1973_hifi_ops,
},
{ /* Voice via BT */
      .name = "Bluetooth",
      .stream_name = "Voice",
      .cpu_dai = &bt_dai,
      .codec_dai = &wm8753_dai[WM8753_DAI_VOICE],
      .ops = &neo1973_voice_ops,
},
};

static struct snd_soc_machine neo1973 = {
      .name = "neo1973",
      .dai_link = neo1973_dai,
      .num_links = ARRAY_SIZE(neo1973_dai),
};

static struct wm8753_setup_data neo1973_wm8753_setup = {
      .i2c_address = 0x1a,
};

static struct snd_soc_device neo1973_snd_devdata = {
      .machine = &neo1973,
      .platform = &s3c24xx_soc_platform,
      .codec_dev = &soc_codec_dev_wm8753,
      .codec_data = &neo1973_wm8753_setup,
};

static struct i2c_client client_template;

static unsigned short normal_i2c[] = { 0x7C, I2C_CLIENT_END };

/* Magic definition of all other variables and things */
I2C_CLIENT_INSMOD;

static int lm4857_amp_probe(struct i2c_adapter *adap, int addr, int kind)
{
      int ret;

      client_template.adapter = adap;
      client_template.addr = addr;

      i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
      if (i2c == NULL)
            return -ENOMEM;

      ret = i2c_attach_client(i2c);
      if (ret < 0) {
            printk(KERN_ERR "LM4857 failed to attach at addr %x\n", addr);
            goto exit_err;
      }

      lm4857_write_regs();
      return ret;

exit_err:
      kfree(i2c);
      return ret;
}

static int lm4857_i2c_detach(struct i2c_client *client)
{
      i2c_detach_client(client);
      kfree(client);
      return 0;
}

static int lm4857_i2c_attach(struct i2c_adapter *adap)
{
      return i2c_probe(adap, &addr_data, lm4857_amp_probe);
}

/* corgi i2c codec control layer */
static struct i2c_driver lm4857_i2c_driver = {
      .driver = {
            .name = "LM4857 I2C Amp",
            .owner = THIS_MODULE,
      },
      .id =             I2C_DRIVERID_LM4857,
      .attach_adapter = lm4857_i2c_attach,
      .detach_client =  lm4857_i2c_detach,
      .command =        NULL,
};

static struct i2c_client client_template = {
      .name =   "LM4857",
      .driver = &lm4857_i2c_driver,
};

static struct platform_device *neo1973_snd_device;

static int __init neo1973_init(void)
{
      int ret;

      neo1973_snd_device = platform_device_alloc("soc-audio", -1);
      if (!neo1973_snd_device)
            return -ENOMEM;

      platform_set_drvdata(neo1973_snd_device, &neo1973_snd_devdata);
      neo1973_snd_devdata.dev = &neo1973_snd_device->dev;
      ret = platform_device_add(neo1973_snd_device);

      if (ret)
            platform_device_put(neo1973_snd_device);

      ret = i2c_add_driver(&lm4857_i2c_driver);
      if (ret != 0)
            printk(KERN_ERR "can't add i2c driver");

      return ret;
}

static void __exit neo1973_exit(void)
{
      platform_device_unregister(neo1973_snd_device);
}

module_init(neo1973_init);
module_exit(neo1973_exit);

/* Module information */
MODULE_AUTHOR("Graeme Gregory, graeme.gregory@wolfsonmicro.com, www.wolfsonmicro.com");
MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973");
MODULE_LICENSE("GPL");

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