添加PM头文件

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2289 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/drivers/include/drivers/pm.h

+/*
+ * File      : pm.h
+ * COPYRIGHT (C) 2012, Shanghai Real-Thread Technology Co., Ltd
+ *
+ * All rights reserved.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-06-02     Bernard      the first version
+ */
+
+#ifndef __PM_H__
+#define __PM_H__
+
+#include <rtthread.h>
+
+#ifdef RT_USING_PM
+enum
+{
+    PM_HIGHSPEED_MODE = 0,  /* mode 0 */
+    PM_RUNNING_MODE,        /* mode 1 */
+    PM_SLEEP_MODE,          /* mode 2 */
+    PM_DEEPSLEEP_MODE,      /* mode 3 */
+    PM_TIMER_MODE,          /* mode 4 */
+    PM_DEEPTIMER_MODE,      /* mode 5 */
+    PM_SHUTDOWN_MODE,       /* mode 6 */
+    PM_DEEPSHUTDOWN_MODE,   /* mode 7 */
+    PM_MODE_MAX = PM_DEEPSHUTDOWN_MODE,
+};
+
+#define RT_PM_DEVICE(device) (struct rt_pm*)(device)
+
+/**
+ * device control flag to request or release power
+ */
+#define RT_PM_DEVICE_CTRL_REQUEST   0x01
+#define RT_PM_DEVICE_CTRL_RELEASE   0x02
+
+struct rt_pm;
+/**
+ * low power mode operations
+ */
+struct rt_pm_ops
+{
+    void (*enter)(struct rt_pm *pm);
+    void (*exit)(struct rt_pm *pm);
+
+    void (*timer_start)(struct rt_pm *pm, rt_uint32_t timeout);
+    void (*timer_stop)(struct rt_pm *pm);
+    rt_uint32_t (*timer_get_tick)(struct rt_pm *pm);
+};
+
+/**
+ * power management
+ */
+struct rt_pm
+{
+    struct rt_device parent;
+    rt_uint8_t mode[PM_MODE_MAX + 1];
+    rt_uint8_t  pm_mode;    /* current pm mode */
+    rt_uint8_t  timer_mask;
+
+    rt_uint32_t pm_tick;
+
+    const struct rt_pm_ops *ops;
+};
+
+
+
+void rt_pm_enter(void);
+void rt_pm_exit(void);
+void rt_pm_request(rt_ubase_t mode);
+void rt_pm_release(rt_ubase_t mode);
+
+void rt_system_pm_init(const struct rt_pm_ops *ops, rt_uint8_t timer_mask,
+                       void *user_data);
+
+#endif
+
+#endif