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