ac97_bus.c 1.6 KB

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  1. /*
  2. * Linux driver model AC97 bus interface
  3. *
  4. * Author: Nicolas Pitre
  5. * Created: Jan 14, 2005
  6. * Copyright: (C) MontaVista Software Inc.
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation; either version 2 of the License, or
  11. * (at your option) any later version.
  12. */
  13. #include <linux/module.h>
  14. #include <linux/init.h>
  15. #include <linux/device.h>
  16. #include <linux/string.h>
  17. /*
  18. * Let drivers decide whether they want to support given codec from their
  19. * probe method. Drivers have direct access to the struct snd_ac97 structure and may
  20. * decide based on the id field amongst other things.
  21. */
  22. static int ac97_bus_match(struct device *dev, struct device_driver *drv)
  23. {
  24. return 1;
  25. }
  26. #ifdef CONFIG_PM
  27. static int ac97_bus_suspend(struct device *dev, pm_message_t state)
  28. {
  29. int ret = 0;
  30. if (dev->driver && dev->driver->suspend)
  31. ret = dev->driver->suspend(dev, state);
  32. return ret;
  33. }
  34. static int ac97_bus_resume(struct device *dev)
  35. {
  36. int ret = 0;
  37. if (dev->driver && dev->driver->resume)
  38. ret = dev->driver->resume(dev);
  39. return ret;
  40. }
  41. #endif /* CONFIG_PM */
  42. struct bus_type ac97_bus_type = {
  43. .name = "ac97",
  44. .match = ac97_bus_match,
  45. #ifdef CONFIG_PM
  46. .suspend = ac97_bus_suspend,
  47. .resume = ac97_bus_resume,
  48. #endif /* CONFIG_PM */
  49. };
  50. static int __init ac97_bus_init(void)
  51. {
  52. return bus_register(&ac97_bus_type);
  53. }
  54. subsys_initcall(ac97_bus_init);
  55. static void __exit ac97_bus_exit(void)
  56. {
  57. bus_unregister(&ac97_bus_type);
  58. }
  59. module_exit(ac97_bus_exit);
  60. EXPORT_SYMBOL(ac97_bus_type);
  61. MODULE_LICENSE("GPL");