// SPDX-License-Identifier: GPL-2.0+
  //
  // 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>

  #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 = {

  	/* 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_soc_component *component,
  			  struct snd_pcm_substream *substream)

  {

  	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);

  
  	/* BE's dont need dummy params */
  	if (!rtd->dai_link->no_pcm)
  		snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);

  
  	return 0;
  }

  static const struct snd_soc_component_driver dummy_platform = {

  	.open		= dummy_dma_open,

  };

  static const struct snd_soc_component_driver dummy_codec = {
  	.idle_bias_on		= 1,
  	.use_pmdown_time	= 1,
  	.endianness		= 1,
  	.non_legacy_dai_naming	= 1,
  };

  #define STUB_RATES	SNDRV_PCM_RATE_8000_384000

  #define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S8 | \
  			SNDRV_PCM_FMTBIT_U8 | \
  			SNDRV_PCM_FMTBIT_S16_LE | \
  			SNDRV_PCM_FMTBIT_U16_LE | \
  			SNDRV_PCM_FMTBIT_S24_LE | \

  			SNDRV_PCM_FMTBIT_S24_3LE | \

  			SNDRV_PCM_FMTBIT_U24_LE | \
  			SNDRV_PCM_FMTBIT_S32_LE | \
  			SNDRV_PCM_FMTBIT_U32_LE | \

  			SNDRV_PCM_FMTBIT_DSD_U8 | \
  			SNDRV_PCM_FMTBIT_DSD_U16_LE | \
  			SNDRV_PCM_FMTBIT_DSD_U32_LE | \

  			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)

  /*
   * The dummy CODEC is only meant to be used in situations where there is no
   * actual hardware.
   *
   * If there is actual hardware even if it does not have a control bus
   * the hardware will still have constraints like supported samplerates, etc.
   * which should be modelled. And the data flow graph also should be modelled
   * using DAPM.
   */

  static struct snd_soc_dai_driver dummy_dai = {
  	.name = "snd-soc-dummy-dai",

  	.playback = {
  		.stream_name	= "Playback",
  		.channels_min	= 1,
  		.channels_max	= 384,
  		.rates		= STUB_RATES,
  		.formats	= STUB_FORMATS,
  	},
  	.capture = {
  		.stream_name	= "Capture",
  		.channels_min	= 1,
  		.channels_max	= 384,
  		.rates = STUB_RATES,
  		.formats = STUB_FORMATS,
  	 },

  };

  int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
  {
  	if (dai->driver == &dummy_dai)
  		return 1;
  	return 0;
  }

  static int snd_soc_dummy_probe(struct platform_device *pdev)

  {

  	int ret;

  	ret = devm_snd_soc_register_component(&pdev->dev,
  					      &dummy_codec, &dummy_dai, 1);

  	if (ret < 0)
  		return ret;

  	ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
  					      NULL, 0);

  
  	return ret;

  }

  static struct platform_driver soc_dummy_driver = {
  	.driver = {
  		.name = "snd-soc-dummy",

  	},
  	.probe = snd_soc_dummy_probe,

  };
  
  static struct platform_device *soc_dummy_dev;

  int __init snd_soc_util_init(void)

  {
  	int ret;

  	soc_dummy_dev =
  		platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
  	if (IS_ERR(soc_dummy_dev))
  		return PTR_ERR(soc_dummy_dev);

  
  	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_driver_unregister(&soc_dummy_driver);

  	platform_device_unregister(soc_dummy_dev);

  }