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/*

 * driver.c - driver support

 *

 * (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

 *               Shaohua Li <shaohua.li@intel.com>

 *               Adam Belay <abelay@novell.com>

 *

 * This code is licenced under the GPL.

 */

#include <linux/mutex.h>

#include <linux/module.h>

#include <linux/cpuidle.h>

#include "cpuidle.h"

struct cpuidle_driver *cpuidle_curr_driver;

DEFINE_SPINLOCK(cpuidle_driver_lock);

/**

 * cpuidle_register_driver - registers a driver

 * @drv: the driver

 */

int cpuidle_register_driver(struct cpuidle_driver *drv)

{

        if (!drv)

                return -EINVAL;

        spin_lock(&cpuidle_driver_lock);

        if (cpuidle_curr_driver) {

                spin_unlock(&cpuidle_driver_lock);

                return -EBUSY;

        }

        cpuidle_curr_driver = drv;

        spin_unlock(&cpuidle_driver_lock);

        return 0;

}

EXPORT_SYMBOL_GPL(cpuidle_register_driver);

/**

 * cpuidle_unregister_driver - unregisters a driver

 * @drv: the driver

 */

void cpuidle_unregister_driver(struct cpuidle_driver *drv)

{

        if (!drv)

                return;

        spin_lock(&cpuidle_driver_lock);

        cpuidle_curr_driver = NULL;

        spin_unlock(&cpuidle_driver_lock);

}

EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);