/*
   * HD-audio bus
   */
  #include <linux/init.h>
  #include <linux/device.h>
  #include <linux/module.h>
  #include <linux/export.h>
  #include <sound/hdaudio.h>
  
  MODULE_DESCRIPTION("HD-audio bus");
  MODULE_LICENSE("GPL");
  
  static int hda_bus_match(struct device *dev, struct device_driver *drv)
  {
  	struct hdac_device *hdev = dev_to_hdac_dev(dev);
  	struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
  
  	if (hdev->type != hdrv->type)
  		return 0;
  	if (hdrv->match)
  		return hdrv->match(hdev, hdrv);
  	return 1;
  }
  
  struct bus_type snd_hda_bus_type = {
  	.name = "hdaudio",
  	.match = hda_bus_match,
  };
  EXPORT_SYMBOL_GPL(snd_hda_bus_type);
  
  static int __init hda_bus_init(void)
  {
  	return bus_register(&snd_hda_bus_type);
  }
  
  static void __exit hda_bus_exit(void)
  {
  	bus_unregister(&snd_hda_bus_type);
  }
  
  subsys_initcall(hda_bus_init);
  module_exit(hda_bus_exit);