[DeviceDrivers] Add watchdog driver frame work

components/drivers/include/drivers/watchdog.h

+/*
+ * 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.
+ */
+
+#ifndef  __WATCHDOG_H__
+#define  __WATCHDOG_H__
+
+#include <rtthread.h>
+
+#define RT_DEVICE_CTRL_WDT_GET_TIMEOUT    (1) /* get timeout(in seconds) */
+#define RT_DEVICE_CTRL_WDT_SET_TIMEOUT    (2) /* set timeout(in seconds) */
+#define RT_DEVICE_CTRL_WDT_GET_TIMELEFT   (3) /* get the left time before reboot(in seconds) */
+#define RT_DEVICE_CTRL_WDT_KEEPALIVE      (4) /* refresh watchdog */
+#define RT_DEVICE_CTRL_WDT_START          (5) /* start watchdog */
+#define RT_DEVICE_CTRL_WDT_STOP           (6) /* stop watchdog */
+
+struct rt_watchdog_ops;
+struct rt_watchdog_device
+{
+    struct rt_device parent;
+    struct rt_watchdog_ops *ops;
+};
+typedef struct rt_watchdog_device rt_watchdog_t;
+
+struct rt_watchdog_ops
+{
+    rt_err_t (*init)(rt_watchdog_t *wdt);
+    rt_err_t (*control)(rt_watchdog_t *wdt, int cmd, void *arg);
+};
+
+rt_err_t rt_hw_watchdog_register(rt_watchdog_t *wdt,
+                                 const char    *name,
+                                 rt_uint32_t    flag,
+                                 void          *data);
+
+#endif /* __WATCHDOG_H__ */

components/drivers/include/rtdevice.h

@@ -320,5 +320,9 @@ void rt_data_queue_reset(struct rt_data_queue *queue);
 #include "drivers/sdio.h"
 #endif
 
+#ifdef RT_USING_WDT
+#include "drivers/watchdog.h"
+#endif
+
 #endif /* __RT_DEVICE_H__ */
 

components/drivers/watchdog/SConscript

+from building import *
+
+cwd     = GetCurrentDir()
+src     = Glob('*.c')
+CPPPATH = [cwd + '/../include']
+group   = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_WDT'], CPPPATH = CPPPATH)
+
+Return('group')

components/drivers/watchdog/watchdog.c

+/*
+ * 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,
+                                    rt_uint8_t        cmd,
+                                    void             *args)
+{
+    rt_watchdog_t *wtd;
+
+    RT_ASSERT(dev != RT_NULL);
+    wtd = (rt_watchdog_t *)dev;
+
+    return (wtd->ops->control(wtd, cmd, args));
+}
+
+/**
+ * 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;
+
+    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;
+    device->user_data   = data;
+
+    /* register a character device */
+    return rt_device_register(device, name, flag);
+}