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ad1980.c

/*
 * ad1980.c  --  ALSA Soc AD1980 codec support
 *
 * Copyright:     Analog Device Inc.
 * Author:  Roy Huang <roy.huang@analog.com>
 *          Cliff Cai <cliff.cai@analog.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.
 */

#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 "ad1980.h"

static unsigned int ac97_read(struct snd_soc_codec *codec,
      unsigned int reg);
static int ac97_write(struct snd_soc_codec *codec,
      unsigned int reg, unsigned int val);

/*
 * AD1980 register cache
 */
static const u16 ad1980_reg[] = {
      0x0090, 0x8000, 0x8000, 0x8000, /* 0 - 6  */
      0x0000, 0x0000, 0x8008, 0x8008, /* 8 - e  */
      0x8808, 0x8808, 0x0000, 0x8808, /* 10 - 16 */
      0x8808, 0x0000, 0x8000, 0x0000, /* 18 - 1e */
      0x0000, 0x0000, 0x0000, 0x0000, /* 20 - 26 */
      0x03c7, 0x0000, 0xbb80, 0xbb80, /* 28 - 2e */
      0xbb80, 0xbb80, 0x0000, 0x8080, /* 30 - 36 */
      0x8080, 0x2000, 0x0000, 0x0000, /* 38 - 3e */
      0x0000, 0x0000, 0x0000, 0x0000, /* reserved */
      0x0000, 0x0000, 0x0000, 0x0000, /* reserved */
      0x0000, 0x0000, 0x0000, 0x0000, /* reserved */
      0x0000, 0x0000, 0x0000, 0x0000, /* reserved */
      0x8080, 0x0000, 0x0000, 0x0000, /* 60 - 66 */
      0x0000, 0x0000, 0x0000, 0x0000, /* reserved */
      0x0000, 0x0000, 0x1001, 0x0000, /* 70 - 76 */
      0x0000, 0x0000, 0x4144, 0x5370  /* 78 - 7e */
};

static const char *ad1980_rec_sel[] = {"Mic", "CD", "NC", "AUX", "Line",
            "Stereo Mix", "Mono Mix", "Phone"};

static const struct soc_enum ad1980_cap_src =
      SOC_ENUM_DOUBLE(AC97_REC_SEL, 8, 0, 7, ad1980_rec_sel);

static const struct snd_kcontrol_new ad1980_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_DOUBLE("PCM Capture Volume", AC97_REC_GAIN, 8, 0, 31, 0),
SOC_SINGLE("PCM Capture Switch", AC97_REC_GAIN, 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("Phone Capture Volume", AC97_PHONE, 0, 31, 1),
SOC_SINGLE("Phone Capture Switch", AC97_PHONE, 15, 1, 1),

SOC_SINGLE("Mic Volume", AC97_MIC, 0, 31, 1),
SOC_SINGLE("Mic Switch", AC97_MIC, 15, 1, 1),

SOC_SINGLE("Stereo Mic Switch", AC97_AD_MISC, 6, 1, 0),
SOC_DOUBLE("Line HP Swap Switch", AC97_AD_MISC, 10, 5, 1, 0),

SOC_DOUBLE("Surround Playback Volume", AC97_SURROUND_MASTER, 8, 0, 31, 1),
SOC_DOUBLE("Surround Playback Switch", AC97_SURROUND_MASTER, 15, 7, 1, 1),

SOC_DOUBLE("Center/LFE Playback Volume", AC97_CENTER_LFE_MASTER, 8, 0, 31, 1),
SOC_DOUBLE("Center/LFE Playback Switch", AC97_CENTER_LFE_MASTER, 15, 7, 1, 1),

SOC_ENUM("Capture Source", ad1980_cap_src),

SOC_SINGLE("Mic Boost Switch", AC97_MIC, 6, 1, 0),
};

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_INT_PAGING:
      case AC97_POWERDOWN:
      case AC97_EXTENDED_STATUS:
      case AC97_VENDOR_ID1:
      case AC97_VENDOR_ID2:
            return soc_ac97_ops.read(codec->ac97, reg);
      default:
            reg = reg >> 1;

            if (reg >= ARRAY_SIZE(ad1980_reg))
                  return -EINVAL;

            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(ad1980_reg))
            cache[reg] = val;

      return 0;
}

struct snd_soc_dai ad1980_dai = {
      .name = "AC97",
      .ac97_control = 1,
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 6,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE, },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE, },
};
EXPORT_SYMBOL_GPL(ad1980_dai);

static int ad1980_reset(struct snd_soc_codec *codec, int try_warm)
{
      u16 retry_cnt = 0;

retry:
      if (try_warm && soc_ac97_ops.warm_reset) {
            soc_ac97_ops.warm_reset(codec->ac97);
            if (ac97_read(codec, AC97_RESET) == 0x0090)
                  return 1;
      }

      soc_ac97_ops.reset(codec->ac97);
      /* Set bit 16slot in register 74h, then every slot will has only 16
       * bits. This command is sent out in 20bit mode, in which case the
       * first nibble of data is eaten by the addr. (Tag is always 16 bit)*/
      ac97_write(codec, AC97_AD_SERIAL_CFG, 0x9900);

      if (ac97_read(codec, AC97_RESET)  != 0x0090)
            goto err;
      return 0;

err:
      while (retry_cnt++ < 10)
            goto retry;

      printk(KERN_ERR "AD1980 AC97 reset failed\n");
      return -EIO;
}

static int ad1980_soc_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;
      u16 vendor_id2;
      u16 ext_status;

      printk(KERN_INFO "AD1980 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 =
            kzalloc(sizeof(u16) * ARRAY_SIZE(ad1980_reg), GFP_KERNEL);
      if (codec->reg_cache == NULL) {
            ret = -ENOMEM;
            goto cache_err;
      }
      memcpy(codec->reg_cache, ad1980_reg, sizeof(u16) * \
                  ARRAY_SIZE(ad1980_reg));
      codec->reg_cache_size = sizeof(u16) * ARRAY_SIZE(ad1980_reg);
      codec->reg_cache_step = 2;
      codec->name = "AD1980";
      codec->owner = THIS_MODULE;
      codec->dai = &ad1980_dai;
      codec->num_dai = 1;
      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 "ad1980: 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 = ad1980_reset(codec, 0);
      if (ret < 0) {
            printk(KERN_ERR "Failed to reset AD1980: AC97 link error\n");
            goto reset_err;
      }

      /* Read out vendor ID to make sure it is ad1980 */
      if (ac97_read(codec, AC97_VENDOR_ID1) != 0x4144)
            goto reset_err;

      vendor_id2 = ac97_read(codec, AC97_VENDOR_ID2);

      if (vendor_id2 != 0x5370) {
            if (vendor_id2 != 0x5374)
                  goto reset_err;
            else
                  printk(KERN_WARNING "ad1980: "
                        "Found AD1981 - only 2/2 IN/OUT Channels "
                        "supported\n");
      }

      /* unmute captures and playbacks volume */
      ac97_write(codec, AC97_MASTER, 0x0000);
      ac97_write(codec, AC97_PCM, 0x0000);
      ac97_write(codec, AC97_REC_GAIN, 0x0000);
      ac97_write(codec, AC97_CENTER_LFE_MASTER, 0x0000);
      ac97_write(codec, AC97_SURROUND_MASTER, 0x0000);

      /*power on LFE/CENTER/Surround DACs*/
      ext_status = ac97_read(codec, AC97_EXTENDED_STATUS);
      ac97_write(codec, AC97_EXTENDED_STATUS, ext_status&~0x3800);

      snd_soc_add_controls(codec, ad1980_snd_ac97_controls,
                        ARRAY_SIZE(ad1980_snd_ac97_controls));
      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "ad1980: failed to register card\n");
            goto reset_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 ad1980_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_ad1980 = {
      .probe =    ad1980_soc_probe,
      .remove =   ad1980_soc_remove,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1980);

MODULE_DESCRIPTION("ASoC ad1980 driver");
MODULE_AUTHOR("Roy Huang, Cliff Cai");
MODULE_LICENSE("GPL");

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