{
      struct mxc_spdif_device *chip;
      struct snd_pcm_runtime *runtime;
      int err = 0;
      struct mxc_spdif_platform_data *spdif_data;

      chip = snd_pcm_substream_chip(substream);

      spdif_data = chip->card->dev->platform_data;
      /* enable rx bus clock */
      clk_enable(spdif_data->spdif_clk);

      runtime = substream->runtime;
      chip->s[SNDRV_PCM_STREAM_CAPTURE].stream = substream;
      runtime->hw = snd_spdif_capture_hw;

      /* set hw param constraints */
      err = snd_pcm_hw_constraint_list(runtime, 0,
                               SNDRV_PCM_HW_PARAM_RATE,
                               &hw_capture_rates_stereo);
      if (err < 0)
            goto failed;
      err =
          snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
      if (err < 0)
            goto failed;

      /* enable spdif dpll lock interrupt */
      spdif_intr_enable(INT_DPLL_LOCKED, 1);

      return 0;

      failed:
      clk_disable(spdif_data->spdif_clk);
      return err;
}