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wm8940.c

/*
 * wm8940.c  --  WM8940 ALSA Soc Audio driver
 *
 * Author: Jonathan Cameron <jic23@cam.ac.uk>
 *
 * Based on wm8510.c
 *    Copyright  2006 Wolfson Microelectronics PLC.
 *    Author:  Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * 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.
 *
 * Not currently handled:
 * Notch filter control
 * AUXMode (inverting vs mixer)
 * No means to obtain current gain if alc enabled.
 * No use made of gpio
 * Fast VMID discharge for power down
 * Soft Start
 * DLR and ALR Swaps not enabled
 * Digital Sidetone not supported
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8940.h"

00043 struct wm8940_priv {
      unsigned int sysclk;
      enum snd_soc_control_type control_type;
      void *control_data;
};

static u16 wm8940_reg_defaults[] = {
      0x8940, /* Soft Reset */
      0x0000, /* Power 1 */
      0x0000, /* Power 2 */
      0x0000, /* Power 3 */
      0x0010, /* Interface Control */
      0x0000, /* Companding Control */
      0x0140, /* Clock Control */
      0x0000, /* Additional Controls */
      0x0000, /* GPIO Control */
      0x0002, /* Auto Increment Control */
      0x0000, /* DAC Control */
      0x00FF, /* DAC Volume */
      0,
      0,
      0x0100, /* ADC Control */
      0x00FF, /* ADC Volume */
      0x0000, /* Notch Filter 1 Control 1 */
      0x0000, /* Notch Filter 1 Control 2 */
      0x0000, /* Notch Filter 2 Control 1 */
      0x0000, /* Notch Filter 2 Control 2 */
      0x0000, /* Notch Filter 3 Control 1 */
      0x0000, /* Notch Filter 3 Control 2 */
      0x0000, /* Notch Filter 4 Control 1 */
      0x0000, /* Notch Filter 4 Control 2 */
      0x0032, /* DAC Limit Control 1 */
      0x0000, /* DAC Limit Control 2 */
      0,
      0,
      0,
      0,
      0,
      0,
      0x0038, /* ALC Control 1 */
      0x000B, /* ALC Control 2 */
      0x0032, /* ALC Control 3 */
      0x0000, /* Noise Gate */
      0x0041, /* PLLN */
      0x000C, /* PLLK1 */
      0x0093, /* PLLK2 */
      0x00E9, /* PLLK3 */
      0,
      0,
      0x0030, /* ALC Control 4 */
      0,
      0x0002, /* Input Control */
      0x0050, /* PGA Gain */
      0,
      0x0002, /* ADC Boost Control */
      0,
      0x0002, /* Output Control */
      0x0000, /* Speaker Mixer Control */
      0,
      0,
      0,
      0x0079, /* Speaker Volume */
      0,
      0x0000, /* Mono Mixer Control */
};

static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
static const struct soc_enum wm8940_adc_companding_enum
= SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
static const struct soc_enum wm8940_dac_companding_enum
= SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);

static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
static const struct soc_enum wm8940_alc_mode_enum
= SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);

static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
static const struct soc_enum wm8940_mic_bias_level_enum
= SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);

static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
static const struct soc_enum wm8940_filter_mode_enum
= SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);

static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);

static const struct snd_kcontrol_new wm8940_snd_controls[] = {
      SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
               6, 1, 0),
      SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
      SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),

      SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
      SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
      SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
                   3, 7, 1, wm8940_alc_max_tlv),
      SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
                   0, 7, 0, wm8940_alc_min_tlv),
      SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
                   0, 14, 0, wm8940_alc_tar_tlv),
      SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
      SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
      SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
      SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
      SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
               3, 1, 0),
      SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
               0, 7, 0),

      SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
      SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
      SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
      SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
                   4, 9, 1, wm8940_lim_thresh_tlv),
      SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
                   0, 12, 0, wm8940_lim_boost_tlv),

      SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
      SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
                   0, 63, 0, wm8940_pga_vol_tlv),
      SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
                   0, 255, 0, wm8940_adc_tlv),
      SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
                   0, 255, 0, wm8940_adc_tlv),
      SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
      SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
                   8, 1, 0, wm8940_capture_boost_vol_tlv),
      SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
                   0, 63, 0, wm8940_spk_vol_tlv),
      SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),

      SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
                   8, 1, 1, wm8940_att_tlv),
      SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),

      SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
      SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
                   7, 1, 1, wm8940_att_tlv),

      SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
      SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
      SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
      SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
      SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
      SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
      SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
};

static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
      SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
      SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
      SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
};

static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
      SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
      SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
      SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
};

static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
      SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
      SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
                      0, 7, 0, wm8940_boost_vol_tlv),
      SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
                      4, 7, 0, wm8940_boost_vol_tlv),
};

static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
      SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
      SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
      SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
};

static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
      SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
                     &wm8940_speaker_mixer_controls[0],
                     ARRAY_SIZE(wm8940_speaker_mixer_controls)),
      SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
                     &wm8940_mono_mixer_controls[0],
                     ARRAY_SIZE(wm8940_mono_mixer_controls)),
      SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),

      SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
      SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
      SND_SOC_DAPM_OUTPUT("MONOOUT"),
      SND_SOC_DAPM_OUTPUT("SPKOUTP"),
      SND_SOC_DAPM_OUTPUT("SPKOUTN"),

      SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
      SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
      SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
                     &wm8940_micpga_controls[0],
                     ARRAY_SIZE(wm8940_micpga_controls)),
      SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
                     &wm8940_input_boost_controls[0],
                     ARRAY_SIZE(wm8940_input_boost_controls)),
      SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),

      SND_SOC_DAPM_INPUT("MICN"),
      SND_SOC_DAPM_INPUT("MICP"),
      SND_SOC_DAPM_INPUT("AUX"),
};

static const struct snd_soc_dapm_route audio_map[] = {
      /* Mono output mixer */
      {"Mono Mixer", "PCM Playback Switch", "DAC"},
      {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
      {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},

      /* Speaker output mixer */
      {"Speaker Mixer", "PCM Playback Switch", "DAC"},
      {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
      {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},

      /* Outputs */
      {"Mono Out", NULL, "Mono Mixer"},
      {"MONOOUT", NULL, "Mono Out"},
      {"SpkN Out", NULL, "Speaker Mixer"},
      {"SpkP Out", NULL, "Speaker Mixer"},
      {"SPKOUTN", NULL, "SpkN Out"},
      {"SPKOUTP", NULL, "SpkP Out"},

      /*  Microphone PGA */
      {"Mic PGA", "MICN Switch", "MICN"},
      {"Mic PGA", "MICP Switch", "MICP"},
      {"Mic PGA", "AUX Switch", "AUX"},

      /* Boost Mixer */
      {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
      {"Boost Mixer", "Mic Volume",  "MICP"},
      {"Boost Mixer", "Aux Volume", "Aux Input"},

      {"ADC", NULL, "Boost Mixer"},
};

static int wm8940_add_widgets(struct snd_soc_codec *codec)
{
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret;

      ret = snd_soc_dapm_new_controls(dapm, wm8940_dapm_widgets,
                              ARRAY_SIZE(wm8940_dapm_widgets));
      if (ret)
            goto error_ret;
      ret = snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
      if (ret)
            goto error_ret;

error_ret:
      return ret;
}

#define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);

static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
                        unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
      u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;

      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            clk |= 1;
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            break;
      default:
            return -EINVAL;
      }
      snd_soc_write(codec, WM8940_CLOCK, clk);

      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            iface |= (2 << 3);
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            iface |= (1 << 3);
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            break;
      case SND_SOC_DAIFMT_DSP_A:
            iface |= (3 << 3);
            break;
      case SND_SOC_DAIFMT_DSP_B:
            iface |= (3 << 3) | (1 << 7);
            break;
      }

      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            break;
      case SND_SOC_DAIFMT_NB_IF:
            iface |= (1 << 7);
            break;
      case SND_SOC_DAIFMT_IB_NF:
            iface |= (1 << 8);
            break;
      case SND_SOC_DAIFMT_IB_IF:
            iface |= (1 << 8) | (1 << 7);
            break;
      }

      snd_soc_write(codec, WM8940_IFACE, iface);

      return 0;
}

static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
                        struct snd_pcm_hw_params *params,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec *codec = rtd->codec;
      u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
      u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
      u16 companding =  snd_soc_read(codec,
                                    WM8940_COMPANDINGCTL) & 0xFFDF;
      int ret;

      /* LoutR control */
      if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
          && params_channels(params) == 2)
            iface |= (1 << 9);

      switch (params_rate(params)) {
      case 8000:
            addcntrl |= (0x5 << 1);
            break;
      case 11025:
            addcntrl |= (0x4 << 1);
            break;
      case 16000:
            addcntrl |= (0x3 << 1);
            break;
      case 22050:
            addcntrl |= (0x2 << 1);
            break;
      case 32000:
            addcntrl |= (0x1 << 1);
            break;
      case 44100:
      case 48000:
            break;
      }
      ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
      if (ret)
            goto error_ret;

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S8:
            companding = companding | (1 << 5);
            break;
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            iface |= (1 << 5);
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            iface |= (2 << 5);
            break;
      case SNDRV_PCM_FORMAT_S32_LE:
            iface |= (3 << 5);
            break;
      }
      ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
      if (ret)
            goto error_ret;
      ret = snd_soc_write(codec, WM8940_IFACE, iface);

error_ret:
      return ret;
}

static int wm8940_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;

      if (mute)
            mute_reg |= 0x40;

      return snd_soc_write(codec, WM8940_DAC, mute_reg);
}

static int wm8940_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      u16 val;
      u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
      int ret = 0;

      switch (level) {
      case SND_SOC_BIAS_ON:
            /* ensure bufioen and biasen */
            pwr_reg |= (1 << 2) | (1 << 3);
            /* Enable thermal shutdown */
            val = snd_soc_read(codec, WM8940_OUTPUTCTL);
            ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
            if (ret)
                  break;
            /* set vmid to 75k */
            ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
            break;
      case SND_SOC_BIAS_PREPARE:
            /* ensure bufioen and biasen */
            pwr_reg |= (1 << 2) | (1 << 3);
            ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
            break;
      case SND_SOC_BIAS_STANDBY:
            /* ensure bufioen and biasen */
            pwr_reg |= (1 << 2) | (1 << 3);
            /* set vmid to 300k for standby */
            ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
            break;
      case SND_SOC_BIAS_OFF:
            ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
            break;
      }

      return ret;
}

struct pll_ {
      unsigned int pre_scale:2;
      unsigned int n:4;
      unsigned int k;
};

static struct pll_ pll_div;

/* The size in bits of the pll divide multiplied by 10
 * to allow rounding later */
#define FIXED_PLL_SIZE ((1 << 24) * 10)
static void pll_factors(unsigned int target, unsigned int source)
{
      unsigned long long Kpart;
      unsigned int K, Ndiv, Nmod;
      /* The left shift ist to avoid accuracy loss when right shifting */
      Ndiv = target / source;

      if (Ndiv > 12) {
            source <<= 1;
            /* Multiply by 2 */
            pll_div.pre_scale = 0;
            Ndiv = target / source;
      } else if (Ndiv < 3) {
            source >>= 2;
            /* Divide by 4 */
            pll_div.pre_scale = 3;
            Ndiv = target / source;
      } else if (Ndiv < 6) {
            source >>= 1;
            /* divide by 2 */
            pll_div.pre_scale = 2;
            Ndiv = target / source;
      } else
            pll_div.pre_scale = 1;

      if ((Ndiv < 6) || (Ndiv > 12))
            printk(KERN_WARNING
                  "WM8940 N value %d outwith recommended range!d\n",
                  Ndiv);

      pll_div.n = Ndiv;
      Nmod = target % source;
      Kpart = FIXED_PLL_SIZE * (long long)Nmod;

      do_div(Kpart, source);

      K = Kpart & 0xFFFFFFFF;

      /* Check if we need to round */
      if ((K % 10) >= 5)
            K += 5;

      /* Move down to proper range now rounding is done */
      K /= 10;

      pll_div.k = K;
}

/* Untested at the moment */
static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
            int source, unsigned int freq_in, unsigned int freq_out)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 reg;

      /* Turn off PLL */
      reg = snd_soc_read(codec, WM8940_POWER1);
      snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);

      if (freq_in == 0 || freq_out == 0) {
            /* Clock CODEC directly from MCLK */
            reg = snd_soc_read(codec, WM8940_CLOCK);
            snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
            /* Pll power down */
            snd_soc_write(codec, WM8940_PLLN, (1 << 7));
            return 0;
      }

      /* Pll is followed by a frequency divide by 4 */
      pll_factors(freq_out*4, freq_in);
      if (pll_div.k)
            snd_soc_write(codec, WM8940_PLLN,
                       (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
      else /* No factional component */
            snd_soc_write(codec, WM8940_PLLN,
                       (pll_div.pre_scale << 4) | pll_div.n);
      snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
      snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
      snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
      /* Enable the PLL */
      reg = snd_soc_read(codec, WM8940_POWER1);
      snd_soc_write(codec, WM8940_POWER1, reg | 0x020);

      /* Run CODEC from PLL instead of MCLK */
      reg = snd_soc_read(codec, WM8940_CLOCK);
      snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);

      return 0;
}

static int wm8940_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 wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);

      switch (freq) {
      case 11289600:
      case 12000000:
      case 12288000:
      case 16934400:
      case 18432000:
            wm8940->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}

static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
                         int div_id, int div)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 reg;
      int ret = 0;

      switch (div_id) {
      case WM8940_BCLKDIV:
            reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFEF3;
            ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
            break;
      case WM8940_MCLKDIV:
            reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
            ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
            break;
      case WM8940_OPCLKDIV:
            reg = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFCF;
            ret = snd_soc_write(codec, WM8940_ADDCNTRL, reg | (div << 4));
            break;
      }
      return ret;
}

#define WM8940_RATES SNDRV_PCM_RATE_8000_48000

#define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                     \
                  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 wm8940_dai_ops = {
      .hw_params = wm8940_i2s_hw_params,
      .set_sysclk = wm8940_set_dai_sysclk,
      .digital_mute = wm8940_mute,
      .set_fmt = wm8940_set_dai_fmt,
      .set_clkdiv = wm8940_set_dai_clkdiv,
      .set_pll = wm8940_set_dai_pll,
};

static struct snd_soc_dai_driver wm8940_dai = {
      .name = "wm8940-hifi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8940_RATES,
            .formats = WM8940_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8940_RATES,
            .formats = WM8940_FORMATS,
      },
      .ops = &wm8940_dai_ops,
      .symmetric_rates = 1,
};

static int wm8940_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
      return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
}

static int wm8940_resume(struct snd_soc_codec *codec)
{
      int i;
      int ret;
      u8 data[3];
      u16 *cache = codec->reg_cache;

      /* Sync reg_cache with the hardware
       * Could use auto incremented writes to speed this up
       */
      for (i = 0; i < ARRAY_SIZE(wm8940_reg_defaults); i++) {
            data[0] = i;
            data[1] = (cache[i] & 0xFF00) >> 8;
            data[2] = cache[i] & 0x00FF;
            ret = codec->hw_write(codec->control_data, data, 3);
            if (ret < 0)
                  goto error_ret;
            else if (ret != 3) {
                  ret = -EIO;
                  goto error_ret;
            }
      }
      ret = wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      if (ret)
            goto error_ret;

error_ret:
      return ret;
}

static int wm8940_probe(struct snd_soc_codec *codec)
{
      struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
      struct wm8940_setup_data *pdata = codec->dev->platform_data;
      int ret;
      u16 reg;

      codec->control_data = wm8940->control_data;
      ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8940->control_type);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
            return ret;
      }

      ret = wm8940_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset\n");
            return ret;
      }

      wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
      if (ret < 0)
            return ret;

      if (!pdata)
            dev_warn(codec->dev, "No platform data supplied\n");
      else {
            reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
            ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
            if (ret < 0)
                  return ret;
      }

      ret = snd_soc_add_controls(codec, wm8940_snd_controls,
                       ARRAY_SIZE(wm8940_snd_controls));
      if (ret)
            return ret;
      ret = wm8940_add_widgets(codec);
      if (ret)
            return ret;

      return ret;
}

static int wm8940_remove(struct snd_soc_codec *codec)
{
      wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
      .probe =    wm8940_probe,
      .remove =   wm8940_remove,
      .suspend =  wm8940_suspend,
      .resume =   wm8940_resume,
      .set_bias_level = wm8940_set_bias_level,
      .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
      .reg_word_size = sizeof(u16),
      .reg_cache_default = wm8940_reg_defaults,
};

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8940_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8940_priv *wm8940;
      int ret;

      wm8940 = kzalloc(sizeof(struct wm8940_priv), GFP_KERNEL);
      if (wm8940 == NULL)
            return -ENOMEM;

      i2c_set_clientdata(i2c, wm8940);
      wm8940->control_data = i2c;
      wm8940->control_type = SND_SOC_I2C;

      ret = snd_soc_register_codec(&i2c->dev,
                  &soc_codec_dev_wm8940, &wm8940_dai, 1);
      if (ret < 0)
            kfree(wm8940);
      return ret;
}

static __devexit int wm8940_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 wm8940_i2c_id[] = {
      { "wm8940", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);

static struct i2c_driver wm8940_i2c_driver = {
      .driver = {
            .name = "wm8940-codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8940_i2c_probe,
      .remove =   __devexit_p(wm8940_i2c_remove),
      .id_table = wm8940_i2c_id,
};
#endif

static int __init wm8940_modinit(void)
{
      int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8940_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register wm8940 I2C driver: %d\n",
                   ret);
      }
#endif
      return ret;
}
module_init(wm8940_modinit);

static void __exit wm8940_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8940_i2c_driver);
#endif
}
module_exit(wm8940_exit);

MODULE_DESCRIPTION("ASoC WM8940 driver");
MODULE_AUTHOR("Jonathan Cameron");
MODULE_LICENSE("GPL");

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