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eukrea-tlv320.c

/*
 * eukrea-tlv320.c  --  SoC audio for eukrea_cpuimxXX in I2S mode
 *
 * Copyright 2010 Eric Bénard, Eukréa Electromatique <eric@eukrea.com>
 *
 * based on sound/soc/s3c24xx/s3c24xx_simtec_tlv320aic23.c
 * which is Copyright 2009 Simtec Electronics
 * and on sound/soc/imx/phycore-ac97.c which is
 * Copyright 2009 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
 * 
 *  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/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>

#include "../codecs/tlv320aic23.h"
#include "imx-ssi.h"

#define CODEC_CLOCK 12000000

static int eukrea_tlv320_hw_params(struct snd_pcm_substream *substream,
                      struct snd_pcm_hw_params *params)
{
      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;

      ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      if (ret) {
            pr_err("%s: failed set cpu dai format\n", __func__);
            return ret;
      }

      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      if (ret) {
            pr_err("%s: failed set codec dai format\n", __func__);
            return ret;
      }

      ret = snd_soc_dai_set_sysclk(codec_dai, 0,
                             CODEC_CLOCK, SND_SOC_CLOCK_OUT);
      if (ret) {
            pr_err("%s: failed setting codec sysclk\n", __func__);
            return ret;
      }
      snd_soc_dai_set_tdm_slot(cpu_dai, 0xffffffc, 0xffffffc, 2, 0);

      ret = snd_soc_dai_set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, 0,
                        SND_SOC_CLOCK_IN);
      if (ret) {
            pr_err("can't set CPU system clock IMX_SSP_SYS_CLK\n");
            return ret;
      }

      return 0;
}

static struct snd_soc_ops eukrea_tlv320_snd_ops = {
      .hw_params  = eukrea_tlv320_hw_params,
};

static struct snd_soc_dai_link eukrea_tlv320_dai = {
      .name       = "tlv320aic23",
      .stream_name      = "TLV320AIC23",
      .codec_dai_name   = "tlv320aic23-hifi",
      .platform_name    = "imx-pcm-audio.0",
      .codec_name = "tlv320aic23-codec.0-001a",
      .cpu_dai_name     = "imx-ssi.0",
      .ops        = &eukrea_tlv320_snd_ops,
};

static struct snd_soc_card eukrea_tlv320 = {
      .name       = "cpuimx-audio",
      .dai_link   = &eukrea_tlv320_dai,
      .num_links  = 1,
};

static struct platform_device *eukrea_tlv320_snd_device;

static int __init eukrea_tlv320_init(void)
{
      int ret;

      if (!machine_is_eukrea_cpuimx27() && !machine_is_eukrea_cpuimx25sd()
            && !machine_is_eukrea_cpuimx35sd())
            /* return happy. We might run on a totally different machine */
            return 0;

      eukrea_tlv320_snd_device = platform_device_alloc("soc-audio", -1);
      if (!eukrea_tlv320_snd_device)
            return -ENOMEM;

      platform_set_drvdata(eukrea_tlv320_snd_device, &eukrea_tlv320);
      ret = platform_device_add(eukrea_tlv320_snd_device);

      if (ret) {
            printk(KERN_ERR "ASoC: Platform device allocation failed\n");
            platform_device_put(eukrea_tlv320_snd_device);
      }

      return ret;
}

static void __exit eukrea_tlv320_exit(void)
{
      platform_device_unregister(eukrea_tlv320_snd_device);
}

module_init(eukrea_tlv320_init);
module_exit(eukrea_tlv320_exit);

MODULE_AUTHOR("Eric Bénard <eric@eukrea.com>");
MODULE_DESCRIPTION("CPUIMX ALSA SoC driver");
MODULE_LICENSE("GPL");

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