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imote2.c

#include <linux/module.h>
#include <sound/soc.h>

#include <asm/mach-types.h>

#include "../codecs/wm8940.h"
#include "pxa2xx-i2s.h"

static int imote2_asoc_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;
      unsigned int clk = 0;
      int ret;

      switch (params_rate(params)) {
      case 8000:
      case 16000:
      case 48000:
      case 96000:
            clk = 12288000;
            break;
      case 11025:
      case 22050:
      case 44100:
            clk = 11289600;
            break;
      }

      /* set codec DAI configuration */
      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S
                          | SND_SOC_DAIFMT_NB_NF
                          | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* CPU should be clock master */
      ret = snd_soc_dai_set_fmt(cpu_dai,  SND_SOC_DAIFMT_I2S
                          | SND_SOC_DAIFMT_NB_NF
                          | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
                             SND_SOC_CLOCK_IN);
      if (ret < 0)
            return ret;

      /* set the I2S system clock as input (unused) */
      ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, clk,
            SND_SOC_CLOCK_OUT);

      return ret;
}

static struct snd_soc_ops imote2_asoc_ops = {
      .hw_params = imote2_asoc_hw_params,
};

static struct snd_soc_dai_link imote2_dai = {
      .name = "WM8940",
      .stream_name = "WM8940",
      .cpu_dai_name = "pxa2xx-i2s",
      .codec_dai_name = "wm8940-hifi",
      .platform_name = "pxa-pcm-audio",
      .codec_name = "wm8940-codec.0-0034",
      .ops = &imote2_asoc_ops,
};

static struct snd_soc_card snd_soc_imote2 = {
      .name = "Imote2",
      .dai_link = &imote2_dai,
      .num_links = 1,
};

static struct platform_device *imote2_snd_device;

static int __init imote2_asoc_init(void)
{
      int ret;

      if (!machine_is_intelmote2())
            return -ENODEV;
      imote2_snd_device = platform_device_alloc("soc-audio", -1);
      if (!imote2_snd_device)
            return -ENOMEM;

      platform_set_drvdata(imote2_snd_device, &snd_soc_imote2);
      ret = platform_device_add(imote2_snd_device);
      if (ret)
            platform_device_put(imote2_snd_device);

      return ret;
}
module_init(imote2_asoc_init);

static void __exit imote2_asoc_exit(void)
{
      platform_device_unregister(imote2_snd_device);
}
module_exit(imote2_asoc_exit);

MODULE_AUTHOR("Jonathan Cameron");
MODULE_DESCRIPTION("ALSA SoC Imote 2");
MODULE_LICENSE("GPL");

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