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 */
25 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
26 {
27 return 1;
28 }
29
30 #ifdef CONFIG_PM
31 static 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
41 static 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
52 struct 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
61 static int __init ac97_bus_init(void)
62 {
63 return bus_register(&ac97_bus_type);
64 }
65
66 subsys_initcall(ac97_bus_init);
67
68 static void __exit ac97_bus_exit(void)
69 {
70 bus_unregister(&ac97_bus_type);
71 }
72
73 module_exit(ac97_bus_exit);
74
75 EXPORT_SYMBOL(ac97_bus_type);
76
77 MODULE_LICENSE("GPL");
78
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