Root/sound/ac97_bus.c

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#include <sound/ac97_codec.h>
19
20/*
21 * Let drivers decide whether they want to support given codec from their
22 * probe method. Drivers have direct access to the struct snd_ac97 structure and may
23 * decide based on the id field amongst other things.
24 */
25static int ac97_bus_match(struct device *dev, struct device_driver *drv)
26{
27    return 1;
28}
29
30#ifdef CONFIG_PM
31static int ac97_bus_suspend(struct device *dev, pm_message_t state)
32{
33    int ret = 0;
34
35    if (dev->driver && dev->driver->suspend)
36        ret = dev->driver->suspend(dev, state);
37
38    return ret;
39}
40
41static int ac97_bus_resume(struct device *dev)
42{
43    int ret = 0;
44
45    if (dev->driver && dev->driver->resume)
46        ret = dev->driver->resume(dev);
47
48    return ret;
49}
50#endif /* CONFIG_PM */
51
52struct bus_type ac97_bus_type = {
53    .name = "ac97",
54    .match = ac97_bus_match,
55#ifdef CONFIG_PM
56    .suspend = ac97_bus_suspend,
57    .resume = ac97_bus_resume,
58#endif /* CONFIG_PM */
59};
60
61static int __init ac97_bus_init(void)
62{
63    return bus_register(&ac97_bus_type);
64}
65
66subsys_initcall(ac97_bus_init);
67
68static void __exit ac97_bus_exit(void)
69{
70    bus_unregister(&ac97_bus_type);
71}
72
73module_exit(ac97_bus_exit);
74
75EXPORT_SYMBOL(ac97_bus_type);
76
77MODULE_LICENSE("GPL");
78

Archive Download this file



interactive