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");

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FreeBSD/Linux Kernel Cross Reference sys/sound/ac97_bus.c

FreeBSD/Linux Kernel Cross Reference
sys/sound/ac97_bus.c