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0ca06a00 LG |
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 | ||
5049c35b | 14 | #include <linux/module.h> |
0ca06a00 LG |
15 | #include <linux/init.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | /* | |
3a91e959 NP |
20 | * Let drivers decide whether they want to support given codec from their |
21 | * probe method. Drivers have direct access to the ac97_t structure and may | |
22 | * decide based on the id field amongst other things. | |
0ca06a00 LG |
23 | */ |
24 | static int ac97_bus_match(struct device *dev, struct device_driver *drv) | |
25 | { | |
3a91e959 | 26 | return 1; |
0ca06a00 LG |
27 | } |
28 | ||
29 | static int ac97_bus_suspend(struct device *dev, pm_message_t state) | |
30 | { | |
31 | int ret = 0; | |
32 | ||
33 | if (dev->driver && dev->driver->suspend) { | |
34 | ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE); | |
35 | if (ret == 0) | |
36 | ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE); | |
37 | if (ret == 0) | |
38 | ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN); | |
39 | } | |
40 | return ret; | |
41 | } | |
42 | ||
43 | static int ac97_bus_resume(struct device *dev) | |
44 | { | |
45 | int ret = 0; | |
46 | ||
47 | if (dev->driver && dev->driver->resume) { | |
48 | ret = dev->driver->resume(dev, RESUME_POWER_ON); | |
49 | if (ret == 0) | |
50 | ret = dev->driver->resume(dev, RESUME_RESTORE_STATE); | |
51 | if (ret == 0) | |
52 | ret = dev->driver->resume(dev, RESUME_ENABLE); | |
53 | } | |
54 | return ret; | |
55 | } | |
56 | ||
57 | struct bus_type ac97_bus_type = { | |
58 | .name = "ac97", | |
59 | .match = ac97_bus_match, | |
60 | .suspend = ac97_bus_suspend, | |
61 | .resume = ac97_bus_resume, | |
62 | }; | |
63 | ||
64 | static int __init ac97_bus_init(void) | |
65 | { | |
66 | return bus_register(&ac97_bus_type); | |
67 | } | |
68 | ||
69 | subsys_initcall(ac97_bus_init); | |
70 | ||
71 | static void __exit ac97_bus_exit(void) | |
72 | { | |
73 | bus_unregister(&ac97_bus_type); | |
74 | } | |
75 | ||
76 | module_exit(ac97_bus_exit); | |
77 | ||
78 | EXPORT_SYMBOL(ac97_bus_type); | |
79 | ||
80 | MODULE_LICENSE("GPL"); |