/*
   * soc-util.c  --  ALSA SoC Audio Layer utility functions
   *
   * Copyright 2009 Wolfson Microelectronics PLC.
   *
   * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   *         Liam Girdwood <lrg@slimlogic.co.uk>
   *         
   *
   *  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/platform_device.h>

  #include <linux/export.h>

  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/soc.h>
  
  int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  {
  	return sample_size * channels * tdm_slots;
  }
  EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  
  int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
  {
  	int sample_size;

  	sample_size = snd_pcm_format_width(params_format(params));
  	if (sample_size < 0)
  		return sample_size;

  
  	return snd_soc_calc_frame_size(sample_size, params_channels(params),
  				       1);
  }
  EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);

  int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  {
  	return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  }
  EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);

  int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  {
  	int ret;
  
  	ret = snd_soc_params_to_frame_size(params);
  
  	if (ret > 0)
  		return ret * params_rate(params);
  	else
  		return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);

  static const struct snd_pcm_hardware dummy_dma_hardware = {
  	.formats		= 0xffffffff,
  	.channels_min		= 1,
  	.channels_max		= UINT_MAX,
  
  	/* Random values to keep userspace happy when checking constraints */
  	.info			= SNDRV_PCM_INFO_INTERLEAVED |
  				  SNDRV_PCM_INFO_BLOCK_TRANSFER,
  	.buffer_bytes_max	= 128*1024,
  	.period_bytes_min	= PAGE_SIZE,
  	.period_bytes_max	= PAGE_SIZE*2,
  	.periods_min		= 2,
  	.periods_max		= 128,
  };
  
  static int dummy_dma_open(struct snd_pcm_substream *substream)
  {
  	snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
  
  	return 0;
  }
  
  static struct snd_pcm_ops dummy_dma_ops = {
  	.open		= dummy_dma_open,
  	.ioctl		= snd_pcm_lib_ioctl,
  };
  
  static struct snd_soc_platform_driver dummy_platform = {
  	.ops = &dummy_dma_ops,
  };

  
  static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
  {
  	return snd_soc_register_platform(&pdev->dev, &dummy_platform);
  }
  
  static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
  {
  	snd_soc_unregister_platform(&pdev->dev);
  
  	return 0;
  }
  
  static struct platform_driver soc_dummy_driver = {
  	.driver = {
  		.name = "snd-soc-dummy",
  		.owner = THIS_MODULE,
  	},
  	.probe = snd_soc_dummy_probe,
  	.remove = __devexit_p(snd_soc_dummy_remove),
  };
  
  static struct platform_device *soc_dummy_dev;

  int __init snd_soc_util_init(void)

  {
  	int ret;
  
  	soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
  	if (!soc_dummy_dev)
  		return -ENOMEM;
  
  	ret = platform_device_add(soc_dummy_dev);
  	if (ret != 0) {
  		platform_device_put(soc_dummy_dev);
  		return ret;
  	}
  
  	ret = platform_driver_register(&soc_dummy_driver);
  	if (ret != 0)
  		platform_device_unregister(soc_dummy_dev);
  
  	return ret;
  }

  void __exit snd_soc_util_exit(void)

  {
  	platform_device_unregister(soc_dummy_dev);
  	platform_driver_unregister(&soc_dummy_driver);
  }