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wm9705.c

/*
 * wm9705.c  --  ALSA Soc WM9705 codec support
 *
 * Copyright 2008 Ian Molton <spyro@f2s.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; Version 2 of the  License only.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include "wm9705.h"

/*
 * WM9705 register cache
 */
static const u16 wm9705_reg[] = {
      0x6150, 0x8000, 0x8000, 0x8000, /* 0x0  */
      0x0000, 0x8000, 0x8008, 0x8008, /* 0x8  */
      0x8808, 0x8808, 0x8808, 0x8808, /* 0x10 */
      0x8808, 0x0000, 0x8000, 0x0000, /* 0x18 */
      0x0000, 0x0000, 0x0000, 0x000f, /* 0x20 */
      0x0605, 0x0000, 0xbb80, 0x0000, /* 0x28 */
      0x0000, 0xbb80, 0x0000, 0x0000, /* 0x30 */
      0x0000, 0x2000, 0x0000, 0x0000, /* 0x38 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x40 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x48 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x50 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x58 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x60 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 0x68 */
      0x0000, 0x0808, 0x0000, 0x0006, /* 0x70 */
      0x0000, 0x0000, 0x574d, 0x4c05, /* 0x78 */
};

static const struct snd_kcontrol_new wm9705_snd_ac97_controls[] = {
      SOC_DOUBLE("Master Playback Volume", AC97_MASTER, 8, 0, 31, 1),
      SOC_SINGLE("Master Playback Switch", AC97_MASTER, 15, 1, 1),
      SOC_DOUBLE("Headphone Playback Volume", AC97_HEADPHONE, 8, 0, 31, 1),
      SOC_SINGLE("Headphone Playback Switch", AC97_HEADPHONE, 15, 1, 1),
      SOC_DOUBLE("PCM Playback Volume", AC97_PCM, 8, 0, 31, 1),
      SOC_SINGLE("PCM Playback Switch", AC97_PCM, 15, 1, 1),
      SOC_SINGLE("Mono Playback Volume", AC97_MASTER_MONO, 0, 31, 1),
      SOC_SINGLE("Mono Playback Switch", AC97_MASTER_MONO, 15, 1, 1),
      SOC_SINGLE("PCBeep Playback Volume", AC97_PC_BEEP, 1, 15, 1),
      SOC_SINGLE("Phone Playback Volume", AC97_PHONE, 0, 31, 1),
      SOC_DOUBLE("Line Playback Volume", AC97_LINE, 8, 0, 31, 1),
      SOC_DOUBLE("CD Playback Volume", AC97_CD, 8, 0, 31, 1),
      SOC_SINGLE("Mic Playback Volume", AC97_MIC, 0, 31, 1),
      SOC_SINGLE("Mic 20dB Boost Switch", AC97_MIC, 6, 1, 0),
      SOC_DOUBLE("Capture Volume", AC97_REC_GAIN, 8, 0, 15, 0),
      SOC_SINGLE("Capture Switch", AC97_REC_GAIN, 15, 1, 1),
};

static const char *wm9705_mic[] = {"Mic 1", "Mic 2"};
static const char *wm9705_rec_sel[] = {"Mic", "CD", "NC", "NC",
      "Line", "Stereo Mix", "Mono Mix", "Phone"};

static const struct soc_enum wm9705_enum_mic =
      SOC_ENUM_SINGLE(AC97_GENERAL_PURPOSE, 8, 2, wm9705_mic);
static const struct soc_enum wm9705_enum_rec_l =
      SOC_ENUM_SINGLE(AC97_REC_SEL, 8, 8, wm9705_rec_sel);
static const struct soc_enum wm9705_enum_rec_r =
      SOC_ENUM_SINGLE(AC97_REC_SEL, 0, 8, wm9705_rec_sel);

/* Headphone Mixer */
static const struct snd_kcontrol_new wm9705_hp_mixer_controls[] = {
      SOC_DAPM_SINGLE("PCBeep Playback Switch", AC97_PC_BEEP, 15, 1, 1),
      SOC_DAPM_SINGLE("CD Playback Switch", AC97_CD, 15, 1, 1),
      SOC_DAPM_SINGLE("Mic Playback Switch", AC97_MIC, 15, 1, 1),
      SOC_DAPM_SINGLE("Phone Playback Switch", AC97_PHONE, 15, 1, 1),
      SOC_DAPM_SINGLE("Line Playback Switch", AC97_LINE, 15, 1, 1),
};

/* Mic source */
static const struct snd_kcontrol_new wm9705_mic_src_controls =
      SOC_DAPM_ENUM("Route", wm9705_enum_mic);

/* Capture source */
static const struct snd_kcontrol_new wm9705_capture_selectl_controls =
      SOC_DAPM_ENUM("Route", wm9705_enum_rec_l);
static const struct snd_kcontrol_new wm9705_capture_selectr_controls =
      SOC_DAPM_ENUM("Route", wm9705_enum_rec_r);

/* DAPM widgets */
static const struct snd_soc_dapm_widget wm9705_dapm_widgets[] = {
      SND_SOC_DAPM_MUX("Mic Source", SND_SOC_NOPM, 0, 0,
            &wm9705_mic_src_controls),
      SND_SOC_DAPM_MUX("Left Capture Source", SND_SOC_NOPM, 0, 0,
            &wm9705_capture_selectl_controls),
      SND_SOC_DAPM_MUX("Right Capture Source", SND_SOC_NOPM, 0, 0,
            &wm9705_capture_selectr_controls),
      SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
            SND_SOC_NOPM, 0, 0),
      SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
            SND_SOC_NOPM, 0, 0),
      SND_SOC_DAPM_MIXER_NAMED_CTL("HP Mixer", SND_SOC_NOPM, 0, 0,
            &wm9705_hp_mixer_controls[0],
            ARRAY_SIZE(wm9705_hp_mixer_controls)),
      SND_SOC_DAPM_MIXER("Mono Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture", SND_SOC_NOPM, 0, 0),
      SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture", SND_SOC_NOPM, 0, 0),
      SND_SOC_DAPM_PGA("Headphone PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Speaker PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Line PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Line out PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Mono PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Phone PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Mic PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("PCBEEP PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("CD PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("ADC PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
      SND_SOC_DAPM_OUTPUT("HPOUTL"),
      SND_SOC_DAPM_OUTPUT("HPOUTR"),
      SND_SOC_DAPM_OUTPUT("LOUT"),
      SND_SOC_DAPM_OUTPUT("ROUT"),
      SND_SOC_DAPM_OUTPUT("MONOOUT"),
      SND_SOC_DAPM_INPUT("PHONE"),
      SND_SOC_DAPM_INPUT("LINEINL"),
      SND_SOC_DAPM_INPUT("LINEINR"),
      SND_SOC_DAPM_INPUT("CDINL"),
      SND_SOC_DAPM_INPUT("CDINR"),
      SND_SOC_DAPM_INPUT("PCBEEP"),
      SND_SOC_DAPM_INPUT("MIC1"),
      SND_SOC_DAPM_INPUT("MIC2"),
};

/* Audio map
 * WM9705 has no switches to disable the route from the inputs to the HP mixer
 * so in order to prevent active inputs from forcing the audio outputs to be
 * constantly enabled, we use the mutes on those inputs to simulate such
 * controls.
 */
static const struct snd_soc_dapm_route audio_map[] = {
      /* HP mixer */
      {"HP Mixer", "PCBeep Playback Switch", "PCBEEP PGA"},
      {"HP Mixer", "CD Playback Switch", "CD PGA"},
      {"HP Mixer", "Mic Playback Switch", "Mic PGA"},
      {"HP Mixer", "Phone Playback Switch", "Phone PGA"},
      {"HP Mixer", "Line Playback Switch", "Line PGA"},
      {"HP Mixer", NULL, "Left DAC"},
      {"HP Mixer", NULL, "Right DAC"},

      /* mono mixer */
      {"Mono Mixer", NULL, "HP Mixer"},

      /* outputs */
      {"Headphone PGA", NULL, "HP Mixer"},
      {"HPOUTL", NULL, "Headphone PGA"},
      {"HPOUTR", NULL, "Headphone PGA"},
      {"Line out PGA", NULL, "HP Mixer"},
      {"LOUT", NULL, "Line out PGA"},
      {"ROUT", NULL, "Line out PGA"},
      {"Mono PGA", NULL, "Mono Mixer"},
      {"MONOOUT", NULL, "Mono PGA"},

      /* inputs */
      {"CD PGA", NULL, "CDINL"},
      {"CD PGA", NULL, "CDINR"},
      {"Line PGA", NULL, "LINEINL"},
      {"Line PGA", NULL, "LINEINR"},
      {"Phone PGA", NULL, "PHONE"},
      {"Mic Source", "Mic 1", "MIC1"},
      {"Mic Source", "Mic 2", "MIC2"},
      {"Mic PGA", NULL, "Mic Source"},
      {"PCBEEP PGA", NULL, "PCBEEP"},

      /* Left capture selector */
      {"Left Capture Source", "Mic", "Mic Source"},
      {"Left Capture Source", "CD", "CDINL"},
      {"Left Capture Source", "Line", "LINEINL"},
      {"Left Capture Source", "Stereo Mix", "HP Mixer"},
      {"Left Capture Source", "Mono Mix", "HP Mixer"},
      {"Left Capture Source", "Phone", "PHONE"},

      /* Right capture source */
      {"Right Capture Source", "Mic", "Mic Source"},
      {"Right Capture Source", "CD", "CDINR"},
      {"Right Capture Source", "Line", "LINEINR"},
      {"Right Capture Source", "Stereo Mix", "HP Mixer"},
      {"Right Capture Source", "Mono Mix", "HP Mixer"},
      {"Right Capture Source", "Phone", "PHONE"},

      {"ADC PGA", NULL, "Left Capture Source"},
      {"ADC PGA", NULL, "Right Capture Source"},

      /* ADC's */
      {"Left ADC",  NULL, "ADC PGA"},
      {"Right ADC", NULL, "ADC PGA"},
};

static int wm9705_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm9705_dapm_widgets,
                              ARRAY_SIZE(wm9705_dapm_widgets));
      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
      snd_soc_dapm_new_widgets(codec);

      return 0;
}

/* We use a register cache to enhance read performance. */
static unsigned int ac97_read(struct snd_soc_codec *codec, unsigned int reg)
{
      u16 *cache = codec->reg_cache;

      switch (reg) {
      case AC97_RESET:
      case AC97_VENDOR_ID1:
      case AC97_VENDOR_ID2:
            return soc_ac97_ops.read(codec->ac97, reg);
      default:
            reg = reg >> 1;

            if (reg >= (ARRAY_SIZE(wm9705_reg)))
                  return -EIO;

            return cache[reg];
      }
}

static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
      unsigned int val)
{
      u16 *cache = codec->reg_cache;

      soc_ac97_ops.write(codec->ac97, reg, val);
      reg = reg >> 1;
      if (reg < (ARRAY_SIZE(wm9705_reg)))
            cache[reg] = val;

      return 0;
}

static int ac97_prepare(struct snd_pcm_substream *substream,
                  struct snd_soc_dai *dai)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      int reg;
      u16 vra;

      vra = ac97_read(codec, AC97_EXTENDED_STATUS);
      ac97_write(codec, AC97_EXTENDED_STATUS, vra | 0x1);

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            reg = AC97_PCM_FRONT_DAC_RATE;
      else
            reg = AC97_PCM_LR_ADC_RATE;

      return ac97_write(codec, reg, runtime->rate);
}

#define WM9705_AC97_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)

static struct snd_soc_dai_ops wm9705_dai_ops = {
      .prepare    = ac97_prepare,
};

struct snd_soc_dai wm9705_dai[] = {
      {
            .name = "AC97 HiFi",
            .ac97_control = 1,
            .playback = {
                  .stream_name = "HiFi Playback",
                  .channels_min = 1,
                  .channels_max = 2,
                  .rates = WM9705_AC97_RATES,
                  .formats = SNDRV_PCM_FMTBIT_S16_LE,
            },
            .capture = {
                  .stream_name = "HiFi Capture",
                  .channels_min = 1,
                  .channels_max = 2,
                  .rates = WM9705_AC97_RATES,
                  .formats = SNDRV_PCM_FMTBIT_S16_LE,
            },
            .ops = &wm9705_dai_ops,
      },
      {
            .name = "AC97 Aux",
            .playback = {
                  .stream_name = "Aux Playback",
                  .channels_min = 1,
                  .channels_max = 1,
                  .rates = WM9705_AC97_RATES,
                  .formats = SNDRV_PCM_FMTBIT_S16_LE,
            },
      }
};
EXPORT_SYMBOL_GPL(wm9705_dai);

static int wm9705_reset(struct snd_soc_codec *codec)
{
      if (soc_ac97_ops.reset) {
            soc_ac97_ops.reset(codec->ac97);
            if (ac97_read(codec, 0) == wm9705_reg[0])
                  return 0; /* Success */
      }

      return -EIO;
}

#ifdef CONFIG_PM
static int wm9705_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      soc_ac97_ops.write(codec->ac97, AC97_POWERDOWN, 0xffff);

      return 0;
}

static int wm9705_soc_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;
      int i, ret;
      u16 *cache = codec->reg_cache;

      ret = wm9705_reset(codec);
      if (ret < 0) {
            printk(KERN_ERR "could not reset AC97 codec\n");
            return ret;
      }

      for (i = 2; i < ARRAY_SIZE(wm9705_reg) << 1; i += 2) {
            soc_ac97_ops.write(codec->ac97, i, cache[i>>1]);
      }

      return 0;
}
#else
#define wm9705_soc_suspend NULL
#define wm9705_soc_resume NULL
#endif

static int wm9705_soc_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      printk(KERN_INFO "WM9705 SoC Audio Codec\n");

      socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec),
                              GFP_KERNEL);
      if (socdev->card->codec == NULL)
            return -ENOMEM;
      codec = socdev->card->codec;
      mutex_init(&codec->mutex);

      codec->reg_cache = kmemdup(wm9705_reg, sizeof(wm9705_reg), GFP_KERNEL);
      if (codec->reg_cache == NULL) {
            ret = -ENOMEM;
            goto cache_err;
      }
      codec->reg_cache_size = sizeof(wm9705_reg);
      codec->reg_cache_step = 2;

      codec->name = "WM9705";
      codec->owner = THIS_MODULE;
      codec->dai = wm9705_dai;
      codec->num_dai = ARRAY_SIZE(wm9705_dai);
      codec->write = ac97_write;
      codec->read = ac97_read;
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
      if (ret < 0) {
            printk(KERN_ERR "wm9705: failed to register AC97 codec\n");
            goto codec_err;
      }

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0)
            goto pcm_err;

      ret = wm9705_reset(codec);
      if (ret)
            goto reset_err;

      snd_soc_add_controls(codec, wm9705_snd_ac97_controls,
                        ARRAY_SIZE(wm9705_snd_ac97_controls));
      wm9705_add_widgets(codec);

      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "wm9705: failed to register card\n");
            goto pcm_err;
      }

      return 0;

reset_err:
      snd_soc_free_pcms(socdev);
pcm_err:
      snd_soc_free_ac97_codec(codec);
codec_err:
      kfree(codec->reg_cache);
cache_err:
      kfree(socdev->card->codec);
      socdev->card->codec = NULL;
      return ret;
}

static int wm9705_soc_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      if (codec == NULL)
            return 0;

      snd_soc_dapm_free(socdev);
      snd_soc_free_pcms(socdev);
      snd_soc_free_ac97_codec(codec);
      kfree(codec->reg_cache);
      kfree(codec);
      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm9705 = {
      .probe =    wm9705_soc_probe,
      .remove =   wm9705_soc_remove,
      .suspend =  wm9705_soc_suspend,
      .resume =   wm9705_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm9705);

MODULE_DESCRIPTION("ASoC WM9705 driver");
MODULE_AUTHOR("Ian Molton");
MODULE_LICENSE("GPL v2");

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