Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Linux driver model AC97 bus interface

 *

 * Author:      Nicolas Pitre

 * Created:     Jan 14, 2005

 * Copyright:   (C) MontaVista Software Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/device.h>

#include <linux/string.h>

/*

 * Let drivers decide whether they want to support given codec from their

 * probe method.  Drivers have direct access to the struct snd_ac97 structure and may

 * decide based on the id field amongst other things.

 */

static int ac97_bus_match(struct device *dev, struct device_driver *drv)

{

        return 1;

}

#ifdef CONFIG_PM

static int ac97_bus_suspend(struct device *dev, pm_message_t state)

{

        int ret = 0;

        if (dev->driver && dev->driver->suspend)

                ret = dev->driver->suspend(dev, state);

        return ret;

}

static int ac97_bus_resume(struct device *dev)

{

        int ret = 0;

        if (dev->driver && dev->driver->resume)

                ret = dev->driver->resume(dev);

        return ret;

}

#endif /* CONFIG_PM */

struct bus_type ac97_bus_type = {

        .name           = "ac97",

        .match          = ac97_bus_match,

#ifdef CONFIG_PM

        .suspend        = ac97_bus_suspend,

        .resume         = ac97_bus_resume,

#endif /* CONFIG_PM */

};

static int __init ac97_bus_init(void)

{

        return bus_register(&ac97_bus_type);

}

subsys_initcall(ac97_bus_init);

static void __exit ac97_bus_exit(void)

{

        bus_unregister(&ac97_bus_type);

}

module_exit(ac97_bus_exit);

EXPORT_SYMBOL(ac97_bus_type);

MODULE_LICENSE("GPL");