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[mirror_ubuntu-zesty-kernel.git] / sound / ac97_bus.c
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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
5049c35b 14#include <linux/module.h>
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15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/string.h>
96841bae 18#include <sound/ac97_codec.h>
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19
20/*
3a91e959 21 * Let drivers decide whether they want to support given codec from their
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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.
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24 */
25static int ac97_bus_match(struct device *dev, struct device_driver *drv)
26{
3a91e959 27 return 1;
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28}
29
66e27788 30#ifdef CONFIG_PM
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31static int ac97_bus_suspend(struct device *dev, pm_message_t state)
32{
33 int ret = 0;
34
90b66e83 35 if (dev->driver && dev->driver->suspend)
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36 ret = dev->driver->suspend(dev, state);
37
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38 return ret;
39}
40
41static int ac97_bus_resume(struct device *dev)
42{
43 int ret = 0;
44
90b66e83 45 if (dev->driver && dev->driver->resume)
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46 ret = dev->driver->resume(dev);
47
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48 return ret;
49}
66e27788 50#endif /* CONFIG_PM */
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51
52struct bus_type ac97_bus_type = {
53 .name = "ac97",
54 .match = ac97_bus_match,
66e27788 55#ifdef CONFIG_PM
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56 .suspend = ac97_bus_suspend,
57 .resume = ac97_bus_resume,
66e27788 58#endif /* CONFIG_PM */
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59};
60
61static int __init ac97_bus_init(void)
62{
63 return bus_register(&ac97_bus_type);
64}
65
66subsys_initcall(ac97_bus_init);
67
68static void __exit ac97_bus_exit(void)
69{
70 bus_unregister(&ac97_bus_type);
71}
72
73module_exit(ac97_bus_exit);
74
75EXPORT_SYMBOL(ac97_bus_type);
76
77MODULE_LICENSE("GPL");