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Linux/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 
 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
 23  * structure and may  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");
 78 

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