projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 90b66e83 NP |
33 | if (dev->driver && dev->driver->suspend) |
| 34 | ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN); | |
| 0ca06a00 LG |
35 | return ret; |
| 36 | } | |
| 37 | ||
| 38 | static int ac97_bus_resume(struct device *dev) | |
| 39 | { | |
| 40 | int ret = 0; | |
| 41 | ||
| 90b66e83 | 42 | if (dev->driver && dev->driver->resume) |
| 0ca06a00 | 43 | ret = dev->driver->resume(dev, RESUME_POWER_ON); |
| 0ca06a00 LG |
44 | return ret; |
| 45 | } | |
| 46 | ||
| 47 | struct bus_type ac97_bus_type = { | |
| 48 | .name = "ac97", | |
| 49 | .match = ac97_bus_match, | |
| 50 | .suspend = ac97_bus_suspend, | |
| 51 | .resume = ac97_bus_resume, | |
| 52 | }; | |
| 53 | ||
| 54 | static int __init ac97_bus_init(void) | |
| 55 | { | |
| 56 | return bus_register(&ac97_bus_type); | |
| 57 | } | |
| 58 | ||
| 59 | subsys_initcall(ac97_bus_init); | |
| 60 | ||
| 61 | static void __exit ac97_bus_exit(void) | |
| 62 | { | |
| 63 | bus_unregister(&ac97_bus_type); | |
| 64 | } | |
| 65 | ||
| 66 | module_exit(ac97_bus_exit); | |
| 67 | ||
| 68 | EXPORT_SYMBOL(ac97_bus_type); | |
| 69 | ||
| 70 | MODULE_LICENSE("GPL"); |