2 * Linux driver model AC97 bus interface
4 * Author: Nicolas Pitre
5 * Created: Jan 14, 2005
6 * Copyright: (C) MontaVista Software Inc.
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.
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/string.h>
20 * Let drivers decide whether they want to support given codec from their
21 * probe method. Drivers have direct access to the ac97_t structure and may
22 * decide based on the id field amongst other things.
24 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
29 static int ac97_bus_suspend(struct device *dev, pm_message_t state)
33 if (dev->driver && dev->driver->suspend)
34 ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
38 static int ac97_bus_resume(struct device *dev)
42 if (dev->driver && dev->driver->resume)
43 ret = dev->driver->resume(dev, RESUME_POWER_ON);
47 struct bus_type ac97_bus_type = {
49 .match = ac97_bus_match,
50 .suspend = ac97_bus_suspend,
51 .resume = ac97_bus_resume,
54 static int __init ac97_bus_init(void)
56 return bus_register(&ac97_bus_type);
59 subsys_initcall(ac97_bus_init);
61 static void __exit ac97_bus_exit(void)
63 bus_unregister(&ac97_bus_type);
66 module_exit(ac97_bus_exit);
68 EXPORT_SYMBOL(ac97_bus_type);
70 MODULE_LICENSE("GPL");