text: // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
  //
  // This file is provided under a dual BSD/GPLv2 license.  When using or
  // redistributing this file, you may do so under either license.
  //
  // Copyright(c) 2018 Intel Corporation. All rights reserved.
  //
  // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
  //
  
  #include <linux/module.h>
  #include <sound/sof.h>
  #include "sof-audio.h"
  #include "sof-priv.h"
  
  static struct snd_soc_card sof_nocodec_card = {
  	.name = "nocodec", /* the sof- prefix is added by the core */
  	.topology_shortname = "sof-nocodec",
  	.owner = THIS_MODULE
  };
  
  static int sof_nocodec_bes_setup(struct device *dev,
  				 struct snd_soc_dai_driver *drv,
  				 struct snd_soc_dai_link *links,
  				 int link_num, struct snd_soc_card *card)
  {
  	struct snd_soc_dai_link_component *dlc;
  	int i;
  
  	if (!drv || !links || !card)
  		return -EINVAL;
  
  	/* set up BE dai_links */
  	for (i = 0; i < link_num; i++) {
  		dlc = devm_kzalloc(dev, 3 * sizeof(*dlc), GFP_KERNEL);
  		if (!dlc)
  			return -ENOMEM;
  
  		links[i].name = devm_kasprintf(dev, GFP_KERNEL,
  					       "NoCodec-%d", i);
  		if (!links[i].name)
  			return -ENOMEM;
  
  		links[i].stream_name = links[i].name;
  
  		links[i].cpus = &dlc[0];
  		links[i].codecs = &dlc[1];
  		links[i].platforms = &dlc[2];
  
  		links[i].num_cpus = 1;
  		links[i].num_codecs = 1;
  		links[i].num_platforms = 1;
  
  		links[i].id = i;
  		links[i].no_pcm = 1;
  		links[i].cpus->dai_name = drv[i].name;
  		links[i].platforms->name = dev_name(dev->parent);
  		links[i].codecs->dai_name = "snd-soc-dummy-dai";
  		links[i].codecs->name = "snd-soc-dummy";
  		if (drv[i].playback.channels_min)
  			links[i].dpcm_playback = 1;
  		if (drv[i].capture.channels_min)
  			links[i].dpcm_capture = 1;
  
  		links[i].be_hw_params_fixup = sof_pcm_dai_link_fixup;
  	}
  
  	card->dai_link = links;
  	card->num_links = link_num;
  
  	return 0;
  }
  
  static int sof_nocodec_setup(struct device *dev,
  			     u32 num_dai_drivers,
  			     struct snd_soc_dai_driver *dai_drivers)
  {
  	struct snd_soc_dai_link *links;
  
  	/* create dummy BE dai_links */
  	links = devm_kzalloc(dev, sizeof(struct snd_soc_dai_link) * num_dai_drivers, GFP_KERNEL);
  	if (!links)
  		return -ENOMEM;
  
  	return sof_nocodec_bes_setup(dev, dai_drivers, links, num_dai_drivers, &sof_nocodec_card);
  }
  
  static int sof_nocodec_probe(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = &sof_nocodec_card;
  	struct snd_soc_acpi_mach *mach;
  	int ret;
  
  	card->dev = &pdev->dev;
  	card->topology_shortname_created = true;
  	mach = pdev->dev.platform_data;
  
  	ret = sof_nocodec_setup(card->dev, mach->mach_params.num_dai_drivers,
  				mach->mach_params.dai_drivers);
  	if (ret < 0)
  		return ret;
  
  	return devm_snd_soc_register_card(&pdev->dev, card);
  }
  
  static int sof_nocodec_remove(struct platform_device *pdev)
  {
  	return 0;
  }
  
  static struct platform_driver sof_nocodec_audio = {
  	.probe = sof_nocodec_probe,
  	.remove = sof_nocodec_remove,
  	.driver = {
  		.name = "sof-nocodec",
  		.pm = &snd_soc_pm_ops,
  	},
  };
  module_platform_driver(sof_nocodec_audio)
  
  MODULE_DESCRIPTION("ASoC sof nocodec");
  MODULE_AUTHOR("Liam Girdwood");
  MODULE_LICENSE("Dual BSD/GPL");
  MODULE_ALIAS("platform:sof-nocodec");
  