Commit | Line | Data |
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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 | ||
34ad73b9 | 14 | #include <sound/driver.h> |
0ca06a00 LG |
15 | #include <linux/init.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | /* | |
20 | * Codec families have names seperated by commas, so we search for an | |
21 | * individual codec name within the family string. | |
22 | */ | |
23 | static int ac97_bus_match(struct device *dev, struct device_driver *drv) | |
24 | { | |
25 | return (strstr(dev->bus_id, drv->name) != NULL); | |
26 | } | |
27 | ||
28 | static int ac97_bus_suspend(struct device *dev, pm_message_t state) | |
29 | { | |
30 | int ret = 0; | |
31 | ||
32 | if (dev->driver && dev->driver->suspend) { | |
33 | ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE); | |
34 | if (ret == 0) | |
35 | ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE); | |
36 | if (ret == 0) | |
37 | ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN); | |
38 | } | |
39 | return ret; | |
40 | } | |
41 | ||
42 | static int ac97_bus_resume(struct device *dev) | |
43 | { | |
44 | int ret = 0; | |
45 | ||
46 | if (dev->driver && dev->driver->resume) { | |
47 | ret = dev->driver->resume(dev, RESUME_POWER_ON); | |
48 | if (ret == 0) | |
49 | ret = dev->driver->resume(dev, RESUME_RESTORE_STATE); | |
50 | if (ret == 0) | |
51 | ret = dev->driver->resume(dev, RESUME_ENABLE); | |
52 | } | |
53 | return ret; | |
54 | } | |
55 | ||
56 | struct bus_type ac97_bus_type = { | |
57 | .name = "ac97", | |
58 | .match = ac97_bus_match, | |
59 | .suspend = ac97_bus_suspend, | |
60 | .resume = ac97_bus_resume, | |
61 | }; | |
62 | ||
63 | static int __init ac97_bus_init(void) | |
64 | { | |
65 | return bus_register(&ac97_bus_type); | |
66 | } | |
67 | ||
68 | subsys_initcall(ac97_bus_init); | |
69 | ||
70 | static void __exit ac97_bus_exit(void) | |
71 | { | |
72 | bus_unregister(&ac97_bus_type); | |
73 | } | |
74 | ||
75 | module_exit(ac97_bus_exit); | |
76 | ||
77 | EXPORT_SYMBOL(ac97_bus_type); | |
78 | ||
79 | MODULE_LICENSE("GPL"); |