80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Linux driver model AC97 bus interface
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*
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* Author: Nicolas Pitre
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* Created: Jan 14, 2005
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* Copyright: (C) MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/string.h>
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/*
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* Codec families have names seperated by commas, so we search for an
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* individual codec name within the family string.
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*/
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static int ac97_bus_match(struct device *dev, struct device_driver *drv)
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{
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return (strstr(dev->bus_id, drv->name) != NULL);
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}
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static int ac97_bus_suspend(struct device *dev, pm_message_t state)
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{
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int ret = 0;
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if (dev->driver && dev->driver->suspend) {
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ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);
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if (ret == 0)
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ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
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if (ret == 0)
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ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
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}
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return ret;
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}
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static int ac97_bus_resume(struct device *dev)
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{
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int ret = 0;
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if (dev->driver && dev->driver->resume) {
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ret = dev->driver->resume(dev, RESUME_POWER_ON);
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if (ret == 0)
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ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
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if (ret == 0)
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ret = dev->driver->resume(dev, RESUME_ENABLE);
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}
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return ret;
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}
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struct bus_type ac97_bus_type = {
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.name = "ac97",
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.match = ac97_bus_match,
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.suspend = ac97_bus_suspend,
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.resume = ac97_bus_resume,
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};
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static int __init ac97_bus_init(void)
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{
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return bus_register(&ac97_bus_type);
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}
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subsys_initcall(ac97_bus_init);
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static void __exit ac97_bus_exit(void)
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{
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bus_unregister(&ac97_bus_type);
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}
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module_exit(ac97_bus_exit);
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EXPORT_SYMBOL(ac97_bus_type);
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MODULE_LICENSE("GPL");
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