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 */
24 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
25 {
26 return 1;
27 }
28
29 #ifdef CONFIG_PM
30 static 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
40 static 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
51 struct 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
60 static int __init ac97_bus_init(void)
61 {
62 return bus_register(&ac97_bus_type);
63 }
64
65 subsys_initcall(ac97_bus_init);
66
67 static void __exit ac97_bus_exit(void)
68 {
69 bus_unregister(&ac97_bus_type);
70 }
71
72 module_exit(ac97_bus_exit);
73
74 EXPORT_SYMBOL(ac97_bus_type);
75
76 MODULE_LICENSE("GPL");
77
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