| | 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 structure and may |
| | 23 | * 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"); |
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