| 1 | /*
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| 2 | * Linux driver model AC97 bus interface
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| 3 | *
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| 4 | * Author: Nicolas Pitre
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| 5 | * Created: Jan 14, 2005
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| 6 | * Copyright: (C) MontaVista Software Inc.
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| 7 | *
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| 8 | * This program is free software; you can redistribute it and/or modify
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| 9 | * it under the terms of the GNU General Public License as published by
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| 10 | * the Free Software Foundation; either version 2 of the License, or
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| 11 | * (at your option) any later version.
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| 12 | */
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| 13 |
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| 14 | #include <linux/module.h>
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| 15 | #include <linux/init.h>
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| 16 | #include <linux/device.h>
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| 17 | #include <linux/string.h>
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| 18 | #include <sound/ac97_codec.h>
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| 19 |
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| 20 | /*
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| 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
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| 23 | * structure and may decide based on the id field amongst other things.
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| 24 | */
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| 25 | static int ac97_bus_match(struct device *dev, struct device_driver *drv)
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| 26 | {
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| 27 | return 1;
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| 28 | }
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| 29 |
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| 30 | #ifdef CONFIG_PM
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| 31 | static int ac97_bus_suspend(struct device *dev, pm_message_t state)
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| 32 | {
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| 33 | int ret = 0;
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| 34 |
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| 35 | if (dev->driver && dev->driver->suspend)
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| 36 | ret = dev->driver->suspend(dev, state);
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| 37 |
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| 38 | return ret;
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| 39 | }
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| 40 |
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| 41 | static int ac97_bus_resume(struct device *dev)
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| 42 | {
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| 43 | int ret = 0;
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| 44 |
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| 45 | if (dev->driver && dev->driver->resume)
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| 46 | ret = dev->driver->resume(dev);
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| 47 |
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| 48 | return ret;
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| 49 | }
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| 50 | #endif /* CONFIG_PM */
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| 51 |
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| 52 | struct bus_type ac97_bus_type = {
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| 53 | .name = "ac97",
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| 54 | .match = ac97_bus_match,
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| 55 | #ifdef CONFIG_PM
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| 56 | .suspend = ac97_bus_suspend,
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| 57 | .resume = ac97_bus_resume,
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| 58 | #endif /* CONFIG_PM */
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| 59 | };
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| 60 |
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| 61 | static int __init ac97_bus_init(void)
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| 62 | {
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| 63 | return bus_register(&ac97_bus_type);
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| 64 | }
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| 65 |
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| 66 | subsys_initcall(ac97_bus_init);
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| 67 |
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| 68 | static void __exit ac97_bus_exit(void)
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| 69 | {
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| 70 | bus_unregister(&ac97_bus_type);
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| 71 | }
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| 72 |
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| 73 | module_exit(ac97_bus_exit);
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| 74 |
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| 75 | EXPORT_SYMBOL(ac97_bus_type);
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| 76 |
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| 77 | MODULE_LICENSE("GPL");
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