satip-axe/kernel/drivers/stm/pm_notify.c

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/*
* -------------------------------------------------------------------------
* <linux_root>/drivers/stm/pm_notify.c
* -------------------------------------------------------------------------
* Copyright (C) 2010 STMicroelectronics
* Author: Francesco M. Virlinzi <francesco.virlinzi@st.com>
*
* May be copied or modified under the terms of the GNU General Public
* License V.2 ONLY. See linux/COPYING for more information.
*
* ------------------------------------------------------------------------- */
#include <linux/irqflags.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/stm/pm_notify.h>
static DEFINE_MUTEX(pm_notify_mutex);
static struct stm_pm_notify *stm_notifier;
enum stm_pm_notify_return
stm_pm_prepare_enter(enum stm_pm_type type)
{
if (stm_notifier && stm_notifier->pre_enter)
return stm_notifier->pre_enter(type);
return STM_PM_RET_OK;
}
enum stm_pm_notify_return
stm_pm_post_enter(enum stm_pm_type type, int wkirq)
{
if (stm_notifier && stm_notifier->post_enter)
return stm_notifier->post_enter(type, wkirq);
return STM_PM_RET_OK;
}
int stm_register_pm_notify(struct stm_pm_notify *notify)
{
if (stm_notifier || !notify)
return -EINVAL;
mutex_lock(&pm_notify_mutex);
stm_notifier = notify;
mutex_unlock(&pm_notify_mutex);
return 0;
}
EXPORT_SYMBOL(stm_register_pm_notify);