/*
 * Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "common.h"
#include <systemd/sd-daemon.h>
#include <stdlib.h>

#define SEC_TO_USEC (1000*1000)

static unsigned int saved_timeout=0;

/* Now, systemd support to enable/disable runtime watchdog */
/* https://github.com/systemd/systemd/commit/2787d83c2 */
int systemd_change_watchdog_timeout(unsigned int timeout)
{
	return sd_notifyf(0, "WATCHDOG_USEC=%llu", (unsigned long long) timeout*SEC_TO_USEC);
}

int _aw_register(unsigned int timeout)
{
	int ret;

	ret = systemd_change_watchdog_timeout(timeout);
	if(ret <=0)
		return -1;

	saved_timeout = timeout;
	return 0;
}

int _aw_control(aw_op_e op, void *data)
{
	int ret=-1;
	unsigned int* timeout;

	switch(op){
	case AW_OP_DISABLE:
		ret = systemd_change_watchdog_timeout(0);
		break;

	case AW_OP_ENABLE:
		ret = systemd_change_watchdog_timeout(saved_timeout);
		break;

	case AW_OP_CHANGE_TIMEOUT:
		timeout = (unsigned int*)(data);
		if(timeout == NULL){
			ret = -1;
			break;
		}
		ret = systemd_change_watchdog_timeout(*timeout);
		if(ret > 0)
			saved_timeout = *timeout;
		break;
	default:
		ret = -1;
		break;
	}

	if(ret > 0)
		return 0;

	return -1;
}

int _aw_notify(void)
{
	int err;
	err = sd_notify(0, "WATCHDOG=1");

	if(err == 0)
		return -ECOMM;
	else if(err > 0)
		err = 0;

	return err;
}