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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 |
23 | * structure and may 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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