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driver.c

/*
 * 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);

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