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 * Codec families have names seperated by commas, so we search for an
21 * individual codec name within the family string.
23 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
25 return (strstr(dev->bus_id, drv->name) != NULL);
28 static int ac97_bus_suspend(struct device *dev, pm_message_t state)
32 if (dev->driver && dev->driver->suspend) {
33 ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);
35 ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
37 ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
42 static int ac97_bus_resume(struct device *dev)
46 if (dev->driver && dev->driver->resume) {
47 ret = dev->driver->resume(dev, RESUME_POWER_ON);
49 ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
51 ret = dev->driver->resume(dev, RESUME_ENABLE);
56 struct bus_type ac97_bus_type = {
58 .match = ac97_bus_match,
59 .suspend = ac97_bus_suspend,
60 .resume = ac97_bus_resume,
63 static int __init ac97_bus_init(void)
65 return bus_register(&ac97_bus_type);
68 subsys_initcall(ac97_bus_init);
70 static void __exit ac97_bus_exit(void)
72 bus_unregister(&ac97_bus_type);
75 module_exit(ac97_bus_exit);
77 EXPORT_SYMBOL(ac97_bus_type);
79 MODULE_LICENSE("GPL");