[DeviceDriver] Add power management device driver.

components/drivers/Kconfig

@@ -104,6 +104,10 @@ config RT_USING_MTD
         default n
     endif
 
+config RT_USING_PM
+    bool "Using Power Management device drivers"
+    default n
+
 config RT_USING_RTC
     bool "Using RTC device drivers"
     default n

components/drivers/include/drivers/pm.h

@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-06-02     Bernard      the first version
+ * 2018-08-02     Tanek        split run and sleep modes, support custom mode
+ */
+
+#ifndef __PM_H__
+#define __PM_H__
+
+#include <rtthread.h>
+
+#ifndef PM_HAS_CUSTOM_CONFIG
+
+/* All modes used for rt_pm_request() adn rt_pm_release() */
+enum
+{
+    /* run modes */
+    PM_RUN_MODE_NORMAL = 0,
+
+    /* sleep modes */
+    PM_SLEEP_MODE_SLEEP,
+    PM_SLEEP_MODE_TIMER,
+    PM_SLEEP_MODE_SHUTDOWN,
+};
+
+/* The name of all modes used in the msh command "pm_dump" */
+#define PM_MODE_NAMES           \
+{                               \
+    "Running Mode",             \
+                                \
+    "Sleep Mode",               \
+    "Timer Mode",               \
+    "Shutdown Mode",            \
+}
+
+/* run mode count : 1 */
+#define PM_RUN_MODE_COUNT       1
+/* sleep mode count : 3 */
+#define PM_SLEEP_MODE_COUNT     3
+
+/* support redefining default run mode */
+#ifndef PM_RUN_MODE_DEFAULT
+#define PM_RUN_MODE_DEFAULT     0
+#endif
+
+/* support redefining default sleep mode */
+#ifndef PM_SLEEP_MODE_DEFAULT
+#define PM_SLEEP_MODE_DEFAULT   (PM_SLEEP_MODE_START)
+#endif
+
+/* support redefining the minimum tick into sleep mode */
+#ifndef PM_MIN_ENTER_SLEEP_TICK
+#define PM_MIN_ENTER_SLEEP_TICK   (1)
+#endif
+
+#else /* PM_HAS_CUSTOM_CONFIG */
+
+#include <pm_cfg.h>
+
+#ifndef PM_RUN_MODE_COUNT
+#error  "You must defined PM_RUN_MODE_COUNT on pm_cfg.h"
+#endif
+
+#ifndef PM_SLEEP_MODE_COUNT
+#error  "You must defined PM_SLEEP_MODE_COUNT on pm_cfg.h"
+#endif
+
+#ifndef PM_MODE_DEFAULT
+#error  "You must defined PM_MODE_DEFAULT on pm_cfg.h"
+#endif
+
+#ifndef PM_MODE_NAMES
+#error  "You must defined PM_MODE_NAMES on pm_cfg.h"
+#endif
+
+#ifndef PM_RUN_MODE_DEFAULT
+#error  "You must defined PM_RUN_MODE_DEFAULT on pm_cfg.h"
+#endif
+
+/* The default sleep mode(PM_SLEEP_MODE_DEFAULT) are not required.
+ * If the default mode is defined, it is requested once in rt_system_pm_init()
+ */
+
+#endif /* PM_HAS_CUSTOM_CONFIG */
+
+/* run mode must start at 0 */
+#define PM_RUN_MODE_START       0
+/* the values of the run modes and sleep mode must be consecutive */
+#define PM_SLEEP_MODE_START     PM_RUN_MODE_COUNT
+/* all mode count */
+#define PM_MODE_COUNT           (PM_RUN_MODE_COUNT + PM_SLEEP_MODE_COUNT)
+/* The last mode, will be request in rt_system_pm_init() */
+#define PM_MODE_MAX             (PM_RUN_MODE_COUNT + PM_SLEEP_MODE_COUNT - 1)
+
+#if PM_MODE_COUNT > 32
+#error "The number of modes cannot exceed 32"
+#endif
+
+/**
+ * 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);
+
+#if PM_RUN_MODE_COUNT > 1
+    void (*frequency_change)(struct rt_pm *pm, rt_uint32_t frequency);
+#endif
+
+    void (*timer_start)(struct rt_pm *pm, rt_uint32_t timeout);
+    void (*timer_stop)(struct rt_pm *pm);
+    rt_tick_t (*timer_get_tick)(struct rt_pm *pm);
+};
+
+struct rt_device_pm_ops
+{
+#if PM_RUN_MODE_COUNT > 1
+    void (*frequency_change)(const struct rt_device* device);
+#endif
+
+    void (*suspend)(const struct rt_device* device);
+    void (*resume) (const struct rt_device* device);
+};
+
+struct rt_device_pm
+{
+    const struct rt_device* device;
+    const struct rt_device_pm_ops* ops;
+};
+
+/**
+ * power management
+ */
+struct rt_pm
+{
+    struct rt_device parent;
+
+    /* modes */
+    rt_uint8_t modes[PM_MODE_COUNT];
+    rt_uint8_t current_mode;    /* current pm mode */
+    rt_uint8_t exit_count;
+
+    /* the list of device, which has PM feature */
+    rt_uint8_t device_pm_number;
+    struct rt_device_pm* device_pm;
+    struct rt_semaphore  device_lock;
+
+    /* if the mode has timer, the corresponding bit is 1*/
+    rt_uint32_t timer_mask;
+
+    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_pm_register_device(struct rt_device* device, const struct rt_device_pm_ops* ops);
+void rt_pm_unregister_device(struct rt_device* device);
+
+void rt_system_pm_init(const struct rt_pm_ops *ops,
+                       rt_uint8_t              timer_mask,
+                       void                   *user_data);
+
+#endif /* __PM_H__ */

components/drivers/include/rtdevice.h

@@ -103,6 +103,10 @@ extern "C" {
 #include "drivers/rt_drv_pwm.h"
 #endif
 
+#ifdef RT_USING_PM
+#include "drivers/pm.h"
+#endif
+
 #ifdef RT_USING_WIFI
 #include "drivers/wlan.h"
 #endif

components/drivers/pm/SConscript

@@ -0,0 +1,14 @@
+from building import *
+
+cwd = GetCurrentDir()
+src = []
+CPPPATH = [cwd + '/../include']
+group = []
+
+if GetDepend(['RT_USING_PM']):
+    src = src + ['pm.c']
+
+if len(src):
+    group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

examples/pm/timer_app.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-08-07     Tanek        first implementation
+ */
+
+#include <board.h>
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#ifndef RT_USING_TIMER_SOFT
+    #error "Please enable soft timer feature!"
+#endif
+
+#define TIMER_APP_DEFAULT_TICK  (RT_TICK_PER_SECOND * 2)
+
+#ifdef RT_USING_PM
+
+static rt_timer_t timer1;
+
+static void _timeout_entry(void *parameter)
+{
+    rt_kprintf("current tick: %ld\n", rt_tick_get());
+}
+
+static int timer_app_init(void)
+{
+    timer1 = rt_timer_create("timer_app",
+                             _timeout_entry,
+                             RT_NULL,
+                             TIMER_APP_DEFAULT_TICK,
+                             RT_TIMER_FLAG_PERIODIC | RT_TIMER_FLAG_SOFT_TIMER);
+    if (timer1 != RT_NULL)
+    {
+        rt_timer_start(timer1);
+
+        /* keep in timer mode */
+        rt_pm_request(PM_SLEEP_MODE_TIMER);
+
+        return 0;
+    }
+    else
+    {
+        return -1;
+    }
+}
+INIT_EXPORT_APP(timer_app_init);
+
+#endif /* RT_USING_PM */
+