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/*
* 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 ac97_t 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;
}
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, SUSPEND_DISABLE);
if (ret == 0)
ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
if (ret == 0)
ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
}
return ret;
}
static int ac97_bus_resume(struct device *dev)
{
int ret = 0;
if (dev->driver && dev->driver->resume) {
ret = dev->driver->resume(dev, RESUME_POWER_ON);
if (ret == 0)
ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
if (ret == 0)
ret = dev->driver->resume(dev, RESUME_ENABLE);
}
return ret;
}
struct bus_type ac97_bus_type = {
.name = "ac97",
.match = ac97_bus_match,
.suspend = ac97_bus_suspend,
.resume = ac97_bus_resume,
};
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");
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