mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
57 lines
1.1 KiB
C
57 lines
1.1 KiB
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);
|