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/* kernel/power/quickwakeup.c
*
* Copyright (C) 2013 Motorola.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/slab.h>
#include <linux/quickwakeup.h>
static LIST_HEAD(qw_head);
static DEFINE_MUTEX(list_lock);
int quickwakeup_register(struct quickwakeup_ops *ops)
{
mutex_lock(&list_lock);
list_add(&ops->list, &qw_head);
mutex_unlock(&list_lock);
return 0;
}
void quickwakeup_unregister(struct quickwakeup_ops *ops)
{
mutex_lock(&list_lock);
list_del(&ops->list);
mutex_unlock(&list_lock);
}
int quickwakeup_check(void)
{
int check = 0;
struct quickwakeup_ops *index;
mutex_lock(&list_lock);
list_for_each_entry(index, &qw_head, list) {
int ret = index->qw_check(index->data);
index->execute = ret;
check |= ret;
pr_debug("%s: %s votes for %s\n", __func__, index->name,
ret ? "execute" : "dont care");
}
mutex_unlock(&list_lock);
return check;
}
/* return 1 => suspend again
return 0 => continue wakeup
*/
int quickwakeup_execute(void)
{
int suspend_again = 0;
int final_vote = 1;
struct quickwakeup_ops *index;
mutex_lock(&list_lock);
list_for_each_entry(index, &qw_head, list) {
if (index->execute) {
int ret = index->qw_execute(index->data);
index->execute = 0;
final_vote &= ret;
suspend_again = final_vote;
pr_debug("%s: %s votes for %s\n", __func__, index->name,
ret ? "suspend again" : "wakeup");
}
}
mutex_unlock(&list_lock);
pr_debug("%s: %s\n", __func__,
suspend_again ? "suspend again" : "wakeup");
return suspend_again;
}
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