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Liam Girdwood0ca06a02005-07-29 16:13:36 +02001/*
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
Jaroslav Kysela5049c352005-08-22 12:19:14 +020014#include <linux/module.h>
Liam Girdwood0ca06a02005-07-29 16:13:36 +020015#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/string.h>
18
19/*
Nicolas Pitre3a91e952005-09-16 18:46:36 +020020 * 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.
Liam Girdwood0ca06a02005-07-29 16:13:36 +020023 */
24static int ac97_bus_match(struct device *dev, struct device_driver *drv)
25{
Nicolas Pitre3a91e952005-09-16 18:46:36 +020026 return 1;
Liam Girdwood0ca06a02005-07-29 16:13:36 +020027}
28
29static int ac97_bus_suspend(struct device *dev, pm_message_t state)
30{
31 int ret = 0;
32
Nicolas Pitre90b66e82005-09-16 18:50:53 +020033 if (dev->driver && dev->driver->suspend)
Russell King9480e302005-10-28 09:52:56 -070034 ret = dev->driver->suspend(dev, state);
35
Liam Girdwood0ca06a02005-07-29 16:13:36 +020036 return ret;
37}
38
39static int ac97_bus_resume(struct device *dev)
40{
41 int ret = 0;
42
Nicolas Pitre90b66e82005-09-16 18:50:53 +020043 if (dev->driver && dev->driver->resume)
Russell King9480e302005-10-28 09:52:56 -070044 ret = dev->driver->resume(dev);
45
Liam Girdwood0ca06a02005-07-29 16:13:36 +020046 return ret;
47}
48
49struct bus_type ac97_bus_type = {
50 .name = "ac97",
51 .match = ac97_bus_match,
52 .suspend = ac97_bus_suspend,
53 .resume = ac97_bus_resume,
54};
55
56static int __init ac97_bus_init(void)
57{
58 return bus_register(&ac97_bus_type);
59}
60
61subsys_initcall(ac97_bus_init);
62
63static void __exit ac97_bus_exit(void)
64{
65 bus_unregister(&ac97_bus_type);
66}
67
68module_exit(ac97_bus_exit);
69
70EXPORT_SYMBOL(ac97_bus_type);
71
72MODULE_LICENSE("GPL");