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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"); |