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stac9766.c

/*
 * stac9766.c  --  ALSA SoC STAC9766 codec support
 *
 * Copyright 2009 Jon Smirl, Digispeaker
 * Author: Jon Smirl <jonsmirl@gmail.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.
 *
 *  Features:-
 *
 *   o Support for AC97 Codec, S/PDIF
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/soc-of-simple.h>

#include "stac9766.h"

#define STAC9766_VERSION "0.10"

/*
 * STAC9766 register cache
 */
static const u16 stac9766_reg[] = {
      0x6A90, 0x8000, 0x8000, 0x8000, /* 6 */
      0x0000, 0x0000, 0x8008, 0x8008, /* e */
      0x8808, 0x8808, 0x8808, 0x8808, /* 16 */
      0x8808, 0x0000, 0x8000, 0x0000, /* 1e */
      0x0000, 0x0000, 0x0000, 0x000f, /* 26 */
      0x0a05, 0x0400, 0xbb80, 0x0000, /* 2e */
      0x0000, 0xbb80, 0x0000, 0x0000, /* 36 */
      0x0000, 0x2000, 0x0000, 0x0100, /* 3e */
      0x0000, 0x0000, 0x0080, 0x0000, /* 46 */
      0x0000, 0x0000, 0x0003, 0xffff, /* 4e */
      0x0000, 0x0000, 0x0000, 0x0000, /* 56 */
      0x4000, 0x0000, 0x0000, 0x0000, /* 5e */
      0x1201, 0xFFFF, 0xFFFF, 0x0000, /* 66 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 6e */
      0x0000, 0x0000, 0x0000, 0x0006, /* 76 */
      0x0000, 0x0000, 0x0000, 0x0000, /* 7e */
};

static const char *stac9766_record_mux[] = {"Mic", "CD", "Video", "AUX",
                  "Line", "Stereo Mix", "Mono Mix", "Phone"};
static const char *stac9766_mono_mux[] = {"Mix", "Mic"};
static const char *stac9766_mic_mux[] = {"Mic1", "Mic2"};
static const char *stac9766_SPDIF_mux[] = {"PCM", "ADC Record"};
static const char *stac9766_popbypass_mux[] = {"Normal", "Bypass Mixer"};
static const char *stac9766_record_all_mux[] = {"All analog",
      "Analog plus DAC"};
static const char *stac9766_boost1[] = {"0dB", "10dB"};
static const char *stac9766_boost2[] = {"0dB", "20dB"};
static const char *stac9766_stereo_mic[] = {"Off", "On"};

static const struct soc_enum stac9766_record_enum =
      SOC_ENUM_DOUBLE(AC97_REC_SEL, 8, 0, 8, stac9766_record_mux);
static const struct soc_enum stac9766_mono_enum =
      SOC_ENUM_SINGLE(AC97_GENERAL_PURPOSE, 9, 2, stac9766_mono_mux);
static const struct soc_enum stac9766_mic_enum =
      SOC_ENUM_SINGLE(AC97_GENERAL_PURPOSE, 8, 2, stac9766_mic_mux);
static const struct soc_enum stac9766_SPDIF_enum =
      SOC_ENUM_SINGLE(AC97_STAC_DA_CONTROL, 1, 2, stac9766_SPDIF_mux);
static const struct soc_enum stac9766_popbypass_enum =
      SOC_ENUM_SINGLE(AC97_GENERAL_PURPOSE, 15, 2, stac9766_popbypass_mux);
static const struct soc_enum stac9766_record_all_enum =
      SOC_ENUM_SINGLE(AC97_STAC_ANALOG_SPECIAL, 12, 2,
                  stac9766_record_all_mux);
static const struct soc_enum stac9766_boost1_enum =
      SOC_ENUM_SINGLE(AC97_MIC, 6, 2, stac9766_boost1); /* 0/10dB */
static const struct soc_enum stac9766_boost2_enum =
      SOC_ENUM_SINGLE(AC97_STAC_ANALOG_SPECIAL, 2, 2, stac9766_boost2); /* 0/20dB */
static const struct soc_enum stac9766_stereo_mic_enum =
      SOC_ENUM_SINGLE(AC97_STAC_STEREO_MIC, 2, 1, stac9766_stereo_mic);

static const DECLARE_TLV_DB_LINEAR(master_tlv, -4600, 0);
static const DECLARE_TLV_DB_LINEAR(record_tlv, 0, 2250);
static const DECLARE_TLV_DB_LINEAR(beep_tlv, -4500, 0);
static const DECLARE_TLV_DB_LINEAR(mix_tlv, -3450, 1200);

static const struct snd_kcontrol_new stac9766_snd_ac97_controls[] = {
      SOC_DOUBLE_TLV("Speaker Volume", AC97_MASTER, 8, 0, 31, 1, master_tlv),
      SOC_SINGLE("Speaker Switch", AC97_MASTER, 15, 1, 1),
      SOC_DOUBLE_TLV("Headphone Volume", AC97_HEADPHONE, 8, 0, 31, 1,
                   master_tlv),
      SOC_SINGLE("Headphone Switch", AC97_HEADPHONE, 15, 1, 1),
      SOC_SINGLE_TLV("Mono Out Volume", AC97_MASTER_MONO, 0, 31, 1,
                   master_tlv),
      SOC_SINGLE("Mono Out Switch", AC97_MASTER_MONO, 15, 1, 1),

      SOC_DOUBLE_TLV("Record Volume", AC97_REC_GAIN, 8, 0, 15, 0, record_tlv),
      SOC_SINGLE("Record Switch", AC97_REC_GAIN, 15, 1, 1),


      SOC_SINGLE_TLV("Beep Volume", AC97_PC_BEEP, 1, 15, 1, beep_tlv),
      SOC_SINGLE("Beep Switch", AC97_PC_BEEP, 15, 1, 1),
      SOC_SINGLE("Beep Frequency", AC97_PC_BEEP, 5, 127, 1),
      SOC_SINGLE_TLV("Phone Volume", AC97_PHONE, 0, 31, 1, mix_tlv),
      SOC_SINGLE("Phone Switch", AC97_PHONE, 15, 1, 1),

      SOC_ENUM("Mic Boost1", stac9766_boost1_enum),
      SOC_ENUM("Mic Boost2", stac9766_boost2_enum),
      SOC_SINGLE_TLV("Mic Volume", AC97_MIC, 0, 31, 1, mix_tlv),
      SOC_SINGLE("Mic Switch", AC97_MIC, 15, 1, 1),
      SOC_ENUM("Stereo Mic", stac9766_stereo_mic_enum),

      SOC_DOUBLE_TLV("Line Volume", AC97_LINE, 8, 0, 31, 1, mix_tlv),
      SOC_SINGLE("Line Switch", AC97_LINE, 15, 1, 1),
      SOC_DOUBLE_TLV("CD Volume", AC97_CD, 8, 0, 31, 1, mix_tlv),
      SOC_SINGLE("CD Switch", AC97_CD, 15, 1, 1),
      SOC_DOUBLE_TLV("AUX Volume", AC97_AUX, 8, 0, 31, 1, mix_tlv),
      SOC_SINGLE("AUX Switch", AC97_AUX, 15, 1, 1),
      SOC_DOUBLE_TLV("Video Volume", AC97_VIDEO, 8, 0, 31, 1, mix_tlv),
      SOC_SINGLE("Video Switch", AC97_VIDEO, 15, 1, 1),

      SOC_DOUBLE_TLV("DAC Volume", AC97_PCM, 8, 0, 31, 1, mix_tlv),
      SOC_SINGLE("DAC Switch", AC97_PCM, 15, 1, 1),
      SOC_SINGLE("Loopback Test Switch", AC97_GENERAL_PURPOSE, 7, 1, 0),
      SOC_SINGLE("3D Volume", AC97_3D_CONTROL, 3, 2, 1),
      SOC_SINGLE("3D Switch", AC97_GENERAL_PURPOSE, 13, 1, 0),

      SOC_ENUM("SPDIF Mux", stac9766_SPDIF_enum),
      SOC_ENUM("Mic1/2 Mux", stac9766_mic_enum),
      SOC_ENUM("Record All Mux", stac9766_record_all_enum),
      SOC_ENUM("Record Mux", stac9766_record_enum),
      SOC_ENUM("Mono Mux", stac9766_mono_enum),
      SOC_ENUM("Pop Bypass Mux", stac9766_popbypass_enum),
};

static int stac9766_ac97_write(struct snd_soc_codec *codec, unsigned int reg,
                         unsigned int val)
{
      u16 *cache = codec->reg_cache;

      if (reg > AC97_STAC_PAGE0) {
            stac9766_ac97_write(codec, AC97_INT_PAGING, 0);
            soc_ac97_ops.write(codec->ac97, reg, val);
            stac9766_ac97_write(codec, AC97_INT_PAGING, 1);
            return 0;
      }
      if (reg / 2 >= ARRAY_SIZE(stac9766_reg))
            return -EIO;

      soc_ac97_ops.write(codec->ac97, reg, val);
      cache[reg / 2] = val;
      return 0;
}

static unsigned int stac9766_ac97_read(struct snd_soc_codec *codec,
                               unsigned int reg)
{
      u16 val = 0, *cache = codec->reg_cache;

      if (reg > AC97_STAC_PAGE0) {
            stac9766_ac97_write(codec, AC97_INT_PAGING, 0);
            val = soc_ac97_ops.read(codec->ac97, reg - AC97_STAC_PAGE0);
            stac9766_ac97_write(codec, AC97_INT_PAGING, 1);
            return val;
      }
      if (reg / 2 >= ARRAY_SIZE(stac9766_reg))
            return -EIO;

      if (reg == AC97_RESET || reg == AC97_GPIO_STATUS ||
            reg == AC97_INT_PAGING || reg == AC97_VENDOR_ID1 ||
            reg == AC97_VENDOR_ID2) {

            val = soc_ac97_ops.read(codec->ac97, reg);
            return val;
      }
      return cache[reg / 2];
}

static int ac97_analog_prepare(struct snd_pcm_substream *substream,
                         struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned short reg, vra;

      vra = stac9766_ac97_read(codec, AC97_EXTENDED_STATUS);

      vra |= 0x1; /* enable variable rate audio */

      stac9766_ac97_write(codec, AC97_EXTENDED_STATUS, vra);

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

      return stac9766_ac97_write(codec, reg, runtime->rate);
}

static int ac97_digital_prepare(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned short reg, vra;

      stac9766_ac97_write(codec, AC97_SPDIF, 0x2002);

      vra = stac9766_ac97_read(codec, AC97_EXTENDED_STATUS);
      vra |= 0x5; /* Enable VRA and SPDIF out */

      stac9766_ac97_write(codec, AC97_EXTENDED_STATUS, vra);

      reg = AC97_PCM_FRONT_DAC_RATE;

      return stac9766_ac97_write(codec, reg, runtime->rate);
}

static int ac97_digital_trigger(struct snd_pcm_substream *substream,
                        int cmd, struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      unsigned short vra;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_STOP:
            vra = stac9766_ac97_read(codec, AC97_EXTENDED_STATUS);
            vra &= !0x04;
            stac9766_ac97_write(codec, AC97_EXTENDED_STATUS, vra);
            break;
      }
      return 0;
}

static int stac9766_set_bias_level(struct snd_soc_codec *codec,
                           enum snd_soc_bias_level level)
{
      switch (level) {
      case SND_SOC_BIAS_ON: /* full On */
      case SND_SOC_BIAS_PREPARE: /* partial On */
      case SND_SOC_BIAS_STANDBY: /* Off, with power */
            stac9766_ac97_write(codec, AC97_POWERDOWN, 0x0000);
            break;
      case SND_SOC_BIAS_OFF: /* Off, without power */
            /* disable everything including AC link */
            stac9766_ac97_write(codec, AC97_POWERDOWN, 0xffff);
            break;
      }
      codec->bias_level = level;
      return 0;
}

static int stac9766_reset(struct snd_soc_codec *codec, int try_warm)
{
      if (try_warm && soc_ac97_ops.warm_reset) {
            soc_ac97_ops.warm_reset(codec->ac97);
            if (stac9766_ac97_read(codec, 0) == stac9766_reg[0])
                  return 1;
      }

      soc_ac97_ops.reset(codec->ac97);
      if (soc_ac97_ops.warm_reset)
            soc_ac97_ops.warm_reset(codec->ac97);
      if (stac9766_ac97_read(codec, 0) != stac9766_reg[0])
            return -EIO;
      return 0;
}

static int stac9766_codec_suspend(struct platform_device *pdev,
                          pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      stac9766_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int stac9766_codec_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;
      u16 id, reset;

      reset = 0;
      /* give the codec an AC97 warm reset to start the link */
reset:
      if (reset > 5) {
            printk(KERN_ERR "stac9766 failed to resume");
            return -EIO;
      }
      codec->ac97->bus->ops->warm_reset(codec->ac97);
      id = soc_ac97_ops.read(codec->ac97, AC97_VENDOR_ID2);
      if (id != 0x4c13) {
            stac9766_reset(codec, 0);
            reset++;
            goto reset;
      }
      stac9766_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      if (codec->suspend_bias_level == SND_SOC_BIAS_ON)
            stac9766_set_bias_level(codec, SND_SOC_BIAS_ON);

      return 0;
}

static struct snd_soc_dai_ops stac9766_dai_ops_analog = {
      .prepare = ac97_analog_prepare,
};

static struct snd_soc_dai_ops stac9766_dai_ops_digital = {
      .prepare = ac97_digital_prepare,
      .trigger = ac97_digital_trigger,
};

struct snd_soc_dai stac9766_dai[] = {
{
      .name = "stac9766 analog",
      .id = 0,
      .ac97_control = 1,

      /* stream cababilities */
      .playback = {
            .stream_name = "stac9766 analog",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SND_SOC_STD_AC97_FMTS,
      },
      .capture = {
            .stream_name = "stac9766 analog",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SND_SOC_STD_AC97_FMTS,
      },
      /* alsa ops */
      .ops = &stac9766_dai_ops_analog,
},
{
      .name = "stac9766 IEC958",
      .id = 1,
      .ac97_control = 1,

      /* stream cababilities */
      .playback = {
            .stream_name = "stac9766 IEC958",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_32000 | \
                  SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE,
      },
      /* alsa ops */
      .ops = &stac9766_dai_ops_digital,
}
};
EXPORT_SYMBOL_GPL(stac9766_dai);

static int stac9766_codec_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 "STAC9766 SoC Audio Codec %s\n", STAC9766_VERSION);

      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(stac9766_reg, sizeof(stac9766_reg),
                           GFP_KERNEL);
      if (codec->reg_cache == NULL) {
            ret = -ENOMEM;
            goto cache_err;
      }
      codec->reg_cache_size = sizeof(stac9766_reg);
      codec->reg_cache_step = 2;

      codec->name = "STAC9766";
      codec->owner = THIS_MODULE;
      codec->dai = stac9766_dai;
      codec->num_dai = ARRAY_SIZE(stac9766_dai);
      codec->write = stac9766_ac97_write;
      codec->read = stac9766_ac97_read;
      codec->set_bias_level = stac9766_set_bias_level;
      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)
            goto codec_err;

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

      /* do a cold reset for the controller and then try
       * a warm reset followed by an optional cold reset for codec */
      stac9766_reset(codec, 0);
      ret = stac9766_reset(codec, 1);
      if (ret < 0) {
            printk(KERN_ERR "Failed to reset STAC9766: AC97 link error\n");
            goto reset_err;
      }

      stac9766_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      snd_soc_add_controls(codec, stac9766_snd_ac97_controls,
                       ARRAY_SIZE(stac9766_snd_ac97_controls));

      ret = snd_soc_init_card(socdev);
      if (ret < 0)
            goto reset_err;
      return 0;

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

static int stac9766_codec_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_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_stac9766 = {
      .probe = stac9766_codec_probe,
      .remove = stac9766_codec_remove,
      .suspend = stac9766_codec_suspend,
      .resume = stac9766_codec_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_stac9766);

MODULE_DESCRIPTION("ASoC stac9766 driver");
MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
MODULE_LICENSE("GPL");

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