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db1200.c

/*
 * DB1200 ASoC audio fabric support code.
 *
 * (c) 2008-9 Manuel Lauss <manuel.lauss@gmail.com>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_psc.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
#include <asm/mach-db1x00/bcsr.h>

#include "../codecs/wm8731.h"
#include "psc.h"

/*-------------------------  AC97 PART  ---------------------------*/

static struct snd_soc_dai_link db1200_ac97_dai = {
      .name       = "AC97",
      .stream_name      = "AC97 HiFi",
      .codec_dai_name   = "ac97-hifi",
      .cpu_dai_name     = "au1xpsc_ac97.1",
      .platform_name    = "au1xpsc-pcm.1",
      .codec_name = "ac97-codec.1",
};

static struct snd_soc_card db1200_ac97_machine = {
      .name       = "DB1200_AC97",
      .dai_link   = &db1200_ac97_dai,
      .num_links  = 1,
};

/*-------------------------  I2S PART  ---------------------------*/

static int db1200_i2s_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
      int ret;

      /* WM8731 has its own 12MHz crystal */
      snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
                        12000000, SND_SOC_CLOCK_IN);

      /* codec is bitclock and lrclk master */
      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_LEFT_J |
                  SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
      if (ret < 0)
            goto out;

      ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_LEFT_J |
                  SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
      if (ret < 0)
            goto out;

      ret = 0;
out:
      return ret;
}

static struct snd_soc_ops db1200_i2s_wm8731_ops = {
      .startup    = db1200_i2s_startup,
};

static struct snd_soc_dai_link db1200_i2s_dai = {
      .name       = "WM8731",
      .stream_name      = "WM8731 PCM",
      .codec_dai_name   = "wm8731-hifi",
      .cpu_dai_name     = "au1xpsc_i2s.1",
      .platform_name    = "au1xpsc-pcm.1",
      .codec_name = "wm8731-codec.0-001b",
      .ops        = &db1200_i2s_wm8731_ops,
};

static struct snd_soc_card db1200_i2s_machine = {
      .name       = "DB1200_I2S",
      .dai_link   = &db1200_i2s_dai,
      .num_links  = 1,
};

/*-------------------------  COMMON PART  ---------------------------*/

static struct platform_device *db1200_asoc_dev;

static int __init db1200_audio_load(void)
{
      int ret;

      ret = -ENOMEM;
      db1200_asoc_dev = platform_device_alloc("soc-audio", 1); /* PSC1 */
      if (!db1200_asoc_dev)
            goto out;

      /* DB1200 board setup set PSC1MUX to preferred audio device */
      if (bcsr_read(BCSR_RESETS) & BCSR_RESETS_PSC1MUX)
            platform_set_drvdata(db1200_asoc_dev, &db1200_i2s_machine);
      else
            platform_set_drvdata(db1200_asoc_dev, &db1200_ac97_machine);

      ret = platform_device_add(db1200_asoc_dev);

      if (ret) {
            platform_device_put(db1200_asoc_dev);
            db1200_asoc_dev = NULL;
      }
out:
      return ret;
}

static void __exit db1200_audio_unload(void)
{
      platform_device_unregister(db1200_asoc_dev);
}

module_init(db1200_audio_load);
module_exit(db1200_audio_unload);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DB1200 ASoC audio support");
MODULE_AUTHOR("Manuel Lauss");

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