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/*
* platform driver support
*/
#include <linux/platform.h>
#include <linux/module.h>
#include <linux/errno.h>
void default_reboot(char * cmd)
{
/* nothing */
}
void default_halt(void)
{
/* nothing */
}
int default_suspend(int state, int flags)
{
return -ENOSYS;
}
static struct platform_t default_platform = {
.name = "Default Platform",
.suspend_states = 0,
.reboot = default_reboot,
.halt = default_halt,
.power_off = default_halt,
.suspend = default_suspend,
.idle = default_idle,
};
struct platform_t * platform = &default_platform;
static spinlock_t platform_lock = SPIN_LOCK_UNLOCKED;
/**
* set_platform_driver - set the platform driver.
* @pf: driver to set it to
*
* Return -EEXIST if someone else already owns it.
*/
int set_platform_driver(struct platform_t * pf)
{
if (!pf)
return -EINVAL;
spin_lock(&platform_lock);
if (platform != &default_platform) {
spin_unlock(&platform_lock);
return -EEXIST;
}
platform = pf;
spin_unlock(&platform_lock);
return 0;
}
void remove_platform_driver(struct platform_t * pf)
{
spin_lock(&platform_lock);
if (platform == pf)
platform = &default_platform;
spin_unlock(&platform_lock);
}
EXPORT_SYMBOL(default_reboot);
EXPORT_SYMBOL(default_halt);
EXPORT_SYMBOL(default_suspend);
EXPORT_SYMBOL(platform);
EXPORT_SYMBOL(set_platform_driver);
EXPORT_SYMBOL(remove_platform_driver);
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