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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/*
20 * Codec families have names seperated by commas, so we search for an
21 * individual codec name within the family string.
22 */
23static int ac97_bus_match(struct device *dev, struct device_driver *drv)
24{
25 return (strstr(dev->bus_id, drv->name) != NULL);
26}
27
28static int ac97_bus_suspend(struct device *dev, pm_message_t state)
29{
30 int ret = 0;
31
32 if (dev->driver && dev->driver->suspend) {
33 ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);
34 if (ret == 0)
35 ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
36 if (ret == 0)
37 ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
38 }
39 return ret;
40}
41
42static int ac97_bus_resume(struct device *dev)
43{
44 int ret = 0;
45
46 if (dev->driver && dev->driver->resume) {
47 ret = dev->driver->resume(dev, RESUME_POWER_ON);
48 if (ret == 0)
49 ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
50 if (ret == 0)
51 ret = dev->driver->resume(dev, RESUME_ENABLE);
52 }
53 return ret;
54}
55
56struct bus_type ac97_bus_type = {
57 .name = "ac97",
58 .match = ac97_bus_match,
59 .suspend = ac97_bus_suspend,
60 .resume = ac97_bus_resume,
61};
62
63static int __init ac97_bus_init(void)
64{
65 return bus_register(&ac97_bus_type);
66}
67
68subsys_initcall(ac97_bus_init);
69
70static void __exit ac97_bus_exit(void)
71{
72 bus_unregister(&ac97_bus_type);
73}
74
75module_exit(ac97_bus_exit);
76
77EXPORT_SYMBOL(ac97_bus_type);
78
79MODULE_LICENSE("GPL");