LXR linux/sound/ac97

   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
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/device.h>
  17#include <linux/string.h>
  18
  19/*
  20 * Let drivers decide whether they want to support given codec from their
  21 * probe method.  Drivers have direct access to the struct snd_ac97 structure and may
  22 * decide based on the id field amongst other things.
  23 */
  24static int ac97_bus_match(struct device *dev, struct device_driver *drv)
  25{
  26        return 1;
  27}
  28
  29#ifdef CONFIG_PM
  30static int ac97_bus_suspend(struct device *dev, pm_message_t state)
  31{
  32        int ret = 0;
  33
  34        if (dev->driver && dev->driver->suspend)
  35                ret = dev->driver->suspend(dev, state);
  36
  37        return ret;
  38}
  39
  40static int ac97_bus_resume(struct device *dev)
  41{
  42        int ret = 0;
  43
  44        if (dev->driver && dev->driver->resume)
  45                ret = dev->driver->resume(dev);
  46
  47        return ret;
  48}
  49#endif /* CONFIG_PM */
  50
  51struct bus_type ac97_bus_type = {
  52        .name           = "ac97",
  53        .match          = ac97_bus_match,
  54#ifdef CONFIG_PM
  55        .suspend        = ac97_bus_suspend,
  56        .resume         = ac97_bus_resume,
  57#endif /* CONFIG_PM */
  58};
  59
  60static int __init ac97_bus_init(void)
  61{
  62        return bus_register(&ac97_bus_type);
  63}
  64
  65subsys_initcall(ac97_bus_init);
  66
  67static void __exit ac97_bus_exit(void)
  68{
  69        bus_unregister(&ac97_bus_type);
  70}
  71
  72module_exit(ac97_bus_exit);
  73
  74EXPORT_SYMBOL(ac97_bus_type);
  75
  76MODULE_LICENSE("GPL");
  77