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/*
* File : watchdog.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2012-2014, Shanghai Real-Thread Electronic Technology Co.,Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2012-09-12 heyuanjie87 first version.
* 2014-03-04 Bernard code cleanup
*/
#include <drivers/watchdog.h>
/* RT-Thread Device Interface */
/*
* This function initializes serial
*/
static rt_err_t rt_watchdog_init(struct rt_device *dev)
{
rt_watchdog_t *wtd;
RT_ASSERT(dev != RT_NULL);
wtd = (rt_watchdog_t *)dev;
if (wtd->ops->init)
{
return (wtd->ops->init(wtd));
}
return (-RT_ENOSYS);
}
static rt_err_t rt_watchdog_open(struct rt_device *dev, rt_uint16_t oflag)
{
return (RT_EOK);
}
static rt_err_t rt_watchdog_close(struct rt_device *dev)
{
rt_watchdog_t *wtd;
RT_ASSERT(dev != RT_NULL);
wtd = (rt_watchdog_t *)dev;
if (wtd->ops->control(wtd, RT_DEVICE_CTRL_WDT_STOP, RT_NULL) != RT_EOK)
{
rt_kprintf(" This watchdog can not be stoped\n");
return (-RT_ERROR);
}
return (RT_EOK);
}
static rt_err_t rt_watchdog_control(struct rt_device *dev,
int cmd,
void *args)
{
rt_watchdog_t *wtd;
RT_ASSERT(dev != RT_NULL);
wtd = (rt_watchdog_t *)dev;
return (wtd->ops->control(wtd, cmd, args));
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops wdt_ops =
{
rt_watchdog_init,
rt_watchdog_open,
rt_watchdog_close,
RT_NULL,
RT_NULL,
rt_watchdog_control,
};
#endif
/**
* This function register a watchdog device
*/
rt_err_t rt_hw_watchdog_register(struct rt_watchdog_device *wtd,
const char *name,
rt_uint32_t flag,
void *data)
{
struct rt_device *device;
RT_ASSERT(wtd != RT_NULL);
device = &(wtd->parent);
device->type = RT_Device_Class_Miscellaneous;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
#ifdef RT_USING_DEVICE_OPS
device->ops = &wdt_ops;
#else
device->init = rt_watchdog_init;
device->open = rt_watchdog_open;
device->close = rt_watchdog_close;
device->read = RT_NULL;
device->write = RT_NULL;
device->control = rt_watchdog_control;
#endif
device->user_data = data;
/* register a character device */
return rt_device_register(device, name, flag);
}
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