[DeviceDrivers] change cmd type.

1. Change 'rt_uint8_t' type of cmd to 'int';
2. Add waitqueue;
3. Split device ipc header files;

components/drivers/audio/audio.c

@@ -293,7 +293,7 @@ static rt_size_t _audio_dev_write(struct rt_device *dev, rt_off_t pos, const voi
     return size;
 }
 
-static rt_err_t _audio_dev_control(struct rt_device *dev, rt_uint8_t cmd, void *args)
+static rt_err_t _audio_dev_control(struct rt_device *dev, int cmd, void *args)
 {
     rt_err_t result = RT_EOK;
     struct rt_audio_device *audio;

components/drivers/hwtimer/hwtimer.c

@@ -206,7 +206,7 @@ static rt_size_t rt_hwtimer_write(struct rt_device *dev, rt_off_t pos, const voi
     return size;
 }
 
-static rt_err_t rt_hwtimer_control(struct rt_device *dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_hwtimer_control(struct rt_device *dev, int cmd, void *args)
 {
     rt_err_t result = RT_EOK;
     rt_hwtimer_t *timer;

components/drivers/i2c/fm24clxx.c

@@ -47,7 +47,7 @@ static rt_err_t fm24clxx_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t fm24clxx_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t fm24clxx_control(rt_device_t dev, int cmd, void *args)
 {
     return RT_EOK;
 }

components/drivers/i2c/i2c_dev.c

@@ -66,7 +66,7 @@ static rt_size_t i2c_bus_device_write(rt_device_t dev,
 }
 
 static rt_err_t i2c_bus_device_control(rt_device_t dev,
-                                       rt_uint8_t  cmd,
+                                       int         cmd,
                                        void       *args)
 {
     rt_err_t ret;

components/drivers/include/drivers/alarm.h

@@ -76,7 +76,7 @@ struct rt_alarm_container
 
 rt_alarm_t rt_alarm_create(rt_alarm_callback_t    callback,
                            struct rt_alarm_setup *setup);
-rt_err_t rt_alarm_control(rt_alarm_t alarm, rt_uint8_t cmd, void *arg);
+rt_err_t rt_alarm_control(rt_alarm_t alarm, int cmd, void *arg);
 void rt_alarm_update(rt_device_t dev, rt_uint32_t event);
 rt_err_t rt_alarm_delete(rt_alarm_t alarm);
 rt_err_t rt_alarm_start(rt_alarm_t alarm);

components/drivers/include/drivers/audio.h

@@ -159,7 +159,7 @@ struct rt_audio_ops
     rt_err_t    (*suspend)      (struct rt_audio_device *audio,int stream);
     rt_err_t    (*resume)       (struct rt_audio_device *audio,int stream);
 
-    rt_err_t    (*control)      (struct rt_audio_device *audio, rt_uint8_t cmd, void *arg);
+    rt_err_t    (*control)      (struct rt_audio_device *audio, int cmd, void *arg);
     rt_size_t   (*transmit)     (struct rt_audio_device *audio, const void *writeBuf,void *readBuf, rt_size_t size);
 
     //get page size of codec or private buffer's info

components/drivers/include/ipc/completion.h

@@ -0,0 +1,23 @@
+#ifndef COMPLETION_H_
+#define COMPLETION_H_
+
+#include <rtthread.h>
+
+/**
+ * Completion
+ */
+
+struct rt_completion
+{
+    rt_uint32_t flag;
+
+    /* suspended list */
+    rt_list_t suspended_list;
+};
+
+void rt_completion_init(struct rt_completion *completion);
+rt_err_t rt_completion_wait(struct rt_completion *completion,
+                            rt_int32_t            timeout);
+void rt_completion_done(struct rt_completion *completion);
+
+#endif

components/drivers/include/ipc/dataqueue.h

@@ -0,0 +1,53 @@
+#ifndef DATAQUEUE_H__
+#define DATAQUEUE_H__
+
+#include <rtthread.h>
+
+#define RT_DATAQUEUE_EVENT_UNKNOWN   0x00
+#define RT_DATAQUEUE_EVENT_POP       0x01
+#define RT_DATAQUEUE_EVENT_PUSH      0x02
+#define RT_DATAQUEUE_EVENT_LWM       0x03
+
+struct rt_data_item;
+#define RT_DATAQUEUE_SIZE(dq)        ((dq)->put_index - (dq)->get_index)
+#define RT_DATAQUEUE_EMPTY(dq)       ((dq)->size - RT_DATAQUEUE_SIZE(dq))
+/* data queue implementation */
+struct rt_data_queue
+{
+    rt_uint16_t size;
+    rt_uint16_t lwm;
+    rt_bool_t   waiting_lwm;
+
+    rt_uint16_t get_index;
+    rt_uint16_t put_index;
+
+    struct rt_data_item *queue;
+
+    rt_list_t suspended_push_list;
+    rt_list_t suspended_pop_list;
+
+    /* event notify */
+    void (*evt_notify)(struct rt_data_queue *queue, rt_uint32_t event);
+};
+
+/**
+ * DataQueue for DeviceDriver
+ */
+rt_err_t rt_data_queue_init(struct rt_data_queue *queue,
+                            rt_uint16_t           size,
+                            rt_uint16_t           lwm,
+                            void (*evt_notify)(struct rt_data_queue *queue, rt_uint32_t event));
+rt_err_t rt_data_queue_push(struct rt_data_queue *queue,
+                            const void           *data_ptr,
+                            rt_size_t             data_size,
+                            rt_int32_t            timeout);
+rt_err_t rt_data_queue_pop(struct rt_data_queue *queue,
+                           const void          **data_ptr,
+                           rt_size_t            *size,
+                           rt_int32_t            timeout);
+rt_err_t rt_data_queue_peak(struct rt_data_queue *queue,
+                            const void          **data_ptr,
+                            rt_size_t            *size);
+void rt_data_queue_reset(struct rt_data_queue *queue);
+
+#endif

components/drivers/include/ipc/pipe.h

@@ -0,0 +1,36 @@
+#ifndef PIPE_H__
+#define PIPE_H__
+
+/**
+ * Pipe Device
+ */
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#ifndef RT_PIPE_BUFSZ
+#define PIPE_BUFSZ    512
+#else
+#define PIPE_BUFSZ    RT_PIPE_BUFSZ
+#endif
+
+struct rt_pipe_device
+{
+	struct rt_device parent;
+
+	/* ring buffer in pipe device */
+	struct rt_ringbuffer *fifo;
+
+	rt_uint8_t readers;
+	rt_uint8_t writers;
+
+	rt_wqueue_t reader_queue;
+	rt_wqueue_t writer_queue;
+
+	struct rt_mutex lock;
+};
+typedef struct rt_pipe_device rt_pipe_t;
+
+rt_pipe_t *rt_pipe_create(const char *name);
+
+#endif
+

components/drivers/include/ipc/poll.h

@@ -0,0 +1,53 @@
+/*
+ * File      : poll.h
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2006-2017, RT-Thread Development Team
+ *
+ *  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
+ * 2016-09-19     Heyuanjie    The first version.
+ * 2016-12-26     Bernard      Update poll interface
+ */
+#ifndef IPC_POLL_H__
+#define IPC_POLL_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct rt_pollreq;
+typedef void (*poll_queue_proc)(rt_wqueue_t *, struct rt_pollreq *);
+
+typedef struct rt_pollreq
+{
+    poll_queue_proc _proc;
+    short _key;
+} rt_pollreq_t;
+
+rt_inline void rt_poll_add(rt_wqueue_t *wq, rt_pollreq_t *req)
+{
+    if (req && req->_proc && wq)
+    {
+        req->_proc(wq, req);
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

components/drivers/include/ipc/ringbuffer.h

@@ -0,0 +1,88 @@
+#ifndef RINGBUFFER_H__
+#define RINGBUFFER_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtthread.h>
+
+/* ring buffer */
+struct rt_ringbuffer
+{
+    rt_uint8_t *buffer_ptr;
+    /* use the msb of the {read,write}_index as mirror bit. You can see this as
+     * if the buffer adds a virtual mirror and the pointers point either to the
+     * normal or to the mirrored buffer. If the write_index has the same value
+     * with the read_index, but in a different mirror, the buffer is full.
+     * While if the write_index and the read_index are the same and within the
+     * same mirror, the buffer is empty. The ASCII art of the ringbuffer is:
+     *
+     *          mirror = 0                    mirror = 1
+     * +---+---+---+---+---+---+---+|+~~~+~~~+~~~+~~~+~~~+~~~+~~~+
+     * | 0 | 1 | 2 | 3 | 4 | 5 | 6 ||| 0 | 1 | 2 | 3 | 4 | 5 | 6 | Full
+     * +---+---+---+---+---+---+---+|+~~~+~~~+~~~+~~~+~~~+~~~+~~~+
+     *  read_idx-^                   write_idx-^
+     *
+     * +---+---+---+---+---+---+---+|+~~~+~~~+~~~+~~~+~~~+~~~+~~~+
+     * | 0 | 1 | 2 | 3 | 4 | 5 | 6 ||| 0 | 1 | 2 | 3 | 4 | 5 | 6 | Empty
+     * +---+---+---+---+---+---+---+|+~~~+~~~+~~~+~~~+~~~+~~~+~~~+
+     * read_idx-^ ^-write_idx
+     *
+     * The tradeoff is we could only use 32KiB of buffer for 16 bit of index.
+     * But it should be enough for most of the cases.
+     *
+     * Ref: http://en.wikipedia.org/wiki/Circular_buffer#Mirroring */
+    rt_uint16_t read_mirror : 1;
+    rt_uint16_t read_index : 15;
+    rt_uint16_t write_mirror : 1;
+    rt_uint16_t write_index : 15;
+    /* as we use msb of index as mirror bit, the size should be signed and
+     * could only be positive. */
+    rt_int16_t buffer_size;
+};
+
+enum rt_ringbuffer_state
+{
+    RT_RINGBUFFER_EMPTY,
+    RT_RINGBUFFER_FULL,
+    /* half full is neither full nor empty */
+    RT_RINGBUFFER_HALFFULL,
+};
+
+/**
+ * RingBuffer for DeviceDriver
+ *
+ * Please note that the ring buffer implementation of RT-Thread
+ * has no thread wait or resume feature.
+ */
+void rt_ringbuffer_init(struct rt_ringbuffer *rb, rt_uint8_t *pool, rt_int16_t size);
+void rt_ringbuffer_reset(struct rt_ringbuffer *rb);
+rt_size_t rt_ringbuffer_put(struct rt_ringbuffer *rb, const rt_uint8_t *ptr, rt_uint16_t length);
+rt_size_t rt_ringbuffer_put_force(struct rt_ringbuffer *rb, const rt_uint8_t *ptr, rt_uint16_t length);
+rt_size_t rt_ringbuffer_putchar(struct rt_ringbuffer *rb, const rt_uint8_t ch);
+rt_size_t rt_ringbuffer_putchar_force(struct rt_ringbuffer *rb, const rt_uint8_t ch);
+rt_size_t rt_ringbuffer_get(struct rt_ringbuffer *rb, rt_uint8_t *ptr, rt_uint16_t length);
+rt_size_t rt_ringbuffer_getchar(struct rt_ringbuffer *rb, rt_uint8_t *ch);
+rt_size_t rt_ringbuffer_data_len(struct rt_ringbuffer *rb);
+
+#ifdef RT_USING_HEAP
+struct rt_ringbuffer* rt_ringbuffer_create(rt_uint16_t length);
+void rt_ringbuffer_destroy(struct rt_ringbuffer *rb);
+#endif
+
+rt_inline rt_uint16_t rt_ringbuffer_get_size(struct rt_ringbuffer *rb)
+{
+    RT_ASSERT(rb != RT_NULL);
+    return rb->buffer_size;
+}
+
+/** return the size of empty space in rb */
+#define rt_ringbuffer_space_len(rb) ((rb)->buffer_size - rt_ringbuffer_data_len(rb))
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

components/drivers/include/ipc/waitqueue.h

@@ -0,0 +1,39 @@
+#ifndef WAITQUEUE_H__
+#define WAITQUEUE_H__
+
+#include <rtthread.h>
+
+struct rt_wqueue_node;
+
+typedef rt_list_t rt_wqueue_t;
+typedef int (*rt_wqueue_func_t)(struct rt_wqueue_node *wait, void *key);
+
+struct rt_wqueue_node
+{
+	rt_thread_t polling_thread;
+	rt_list_t   list;
+
+	rt_wqueue_func_t wakeup;
+	rt_uint32_t key;
+};
+typedef struct rt_wqueue_node rt_wqueue_node_t;
+
+int __wqueue_default_wake(struct rt_wqueue_node *wait, void *key);
+
+void rt_wqueue_add(rt_wqueue_t *queue, struct rt_wqueue_node *node);
+void rt_wqueue_remove(struct rt_wqueue_node *node);
+int  rt_wqueue_wait(rt_wqueue_t *queue, int condition, int timeout);
+void rt_wqueue_wakeup(rt_wqueue_t *queue, void *key);
+
+#define DEFINE_WAIT_FUNC(name, function)                \
+    struct rt_wqueue_node name = {                      \
+        rt_current_thread,                              \
+        RT_LIST_OBJECT_INIT(((name).list)),             \
+                                                        \
+        function,                                       \
+        0                                               \
+    }
+
+#define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, __wqueue_default_wake)
+
+#endif

components/drivers/include/ipc/workqueue.h

@@ -0,0 +1,41 @@
+#ifndef WORKQUEUE_H__
+#define WORKQUEUE_H__
+
+#include <rtthread.h>
+
+/* workqueue implementation */
+struct rt_workqueue
+{
+    rt_list_t      work_list;
+    struct rt_work *work_current; /* current work */
+    rt_thread_t    work_thread;
+};
+
+struct rt_work
+{
+    rt_list_t list;
+
+    void (*work_func)(struct rt_work* work, void* work_data);
+    void *work_data;
+};
+
+#ifdef RT_USING_HEAP
+/**
+ * WorkQueue for DeviceDriver
+ */
+struct rt_workqueue *rt_workqueue_create(const char* name, rt_uint16_t stack_size, rt_uint8_t priority);
+rt_err_t rt_workqueue_destroy(struct rt_workqueue* queue);
+rt_err_t rt_workqueue_dowork(struct rt_workqueue* queue, struct rt_work* work);
+rt_err_t rt_workqueue_cancel_work(struct rt_workqueue* queue, struct rt_work* work);
+
+rt_inline void rt_work_init(struct rt_work* work, void (*work_func)(struct rt_work* work, void* work_data),
+    void* work_data)
+{
+    rt_list_init(&(work->list));
+    work->work_func = work_func;
+    work->work_data = work_data;
+}
+#endif
+
+#endif
+

components/drivers/misc/pin.c

@@ -60,7 +60,7 @@ static rt_size_t _pin_write(rt_device_t dev, rt_off_t pos, const void *buffer, r
     return size;
 }
 
-static rt_err_t  _pin_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t  _pin_control(rt_device_t dev, int cmd, void *args)
 {
     struct rt_device_pin_mode *mode;
     struct rt_device_pin *pin = (struct rt_device_pin *)dev;

components/drivers/mtd/mtd_nand.c

@@ -64,7 +64,7 @@ static rt_size_t _mtd_write(rt_device_t dev,
     return size;
 }
 
-static rt_err_t _mtd_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t _mtd_control(rt_device_t dev, int cmd, void *args)
 {
     return RT_EOK;
 }

components/drivers/mtd/mtd_nor.c

@@ -60,7 +60,7 @@ static rt_size_t _mtd_write(rt_device_t dev,
     return size;
 }
 
-static rt_err_t _mtd_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t _mtd_control(rt_device_t dev, int cmd, void *args)
 {
     return RT_EOK;
 }

components/drivers/rtc/alarm.c

@@ -397,7 +397,7 @@ void rt_alarm_update(rt_device_t dev, rt_uint32_t event)
  * \param cmd control command
  * \param arg argument
  */
-rt_err_t rt_alarm_control(rt_alarm_t alarm, rt_uint8_t cmd, void *arg)
+rt_err_t rt_alarm_control(rt_alarm_t alarm, int cmd, void *arg)
 {
     rt_err_t ret = RT_ERROR;
 

components/drivers/sdio/block_dev.c

@@ -222,7 +222,7 @@ static rt_err_t rt_mmcsd_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t rt_mmcsd_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_mmcsd_control(rt_device_t dev, int cmd, void *args)
 {
     struct mmcsd_blk_device *blk_dev = (struct mmcsd_blk_device *)dev->user_data;
     switch (cmd)
@@ -247,7 +247,7 @@ static rt_size_t rt_mmcsd_read(rt_device_t dev,
 
     if (dev == RT_NULL)
     {
-        rt_set_errno(-DFS_STATUS_EINVAL);
+        rt_set_errno(-EINVAL);
 
         return 0;
     }
@@ -259,7 +259,7 @@ static rt_size_t rt_mmcsd_read(rt_device_t dev,
     /* the length of reading must align to SECTOR SIZE */
     if (err) 
     {
-        rt_set_errno(-DFS_STATUS_EIO);
+        rt_set_errno(-EIO);
         return 0;
     }
     return size;
@@ -276,7 +276,7 @@ static rt_size_t rt_mmcsd_write(rt_device_t dev,
 
     if (dev == RT_NULL)
     {
-        rt_set_errno(-DFS_STATUS_EINVAL);
+        rt_set_errno(-EINVAL);
 
         return 0;
     }
@@ -288,7 +288,7 @@ static rt_size_t rt_mmcsd_write(rt_device_t dev,
     /* the length of reading must align to SECTOR SIZE */
     if (err) 
     {
-        rt_set_errno(-DFS_STATUS_EIO);
+        rt_set_errno(-EIO);
 
         return 0;
     }

components/drivers/spi/enc28j60.c

@@ -343,7 +343,7 @@ static rt_err_t enc28j60_init(rt_device_t dev)
 }
 
 /* control the interface */
-static rt_err_t enc28j60_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t enc28j60_control(rt_device_t dev, int cmd, void *args)
 {
     struct net_device * enc28j60 = (struct net_device *)dev;
     switch(cmd)

components/drivers/spi/spi_dev.c

@@ -54,7 +54,7 @@ static rt_size_t _spi_bus_device_write(rt_device_t dev,
 }
 
 static rt_err_t _spi_bus_device_control(rt_device_t dev,
-                                        rt_uint8_t  cmd,
+                                        int         cmd,
                                         void       *args)
 {
     /* TODO: add control command handle */
@@ -120,7 +120,7 @@ static rt_size_t _spidev_device_write(rt_device_t dev,
 }
 
 static rt_err_t _spidev_device_control(rt_device_t dev,
-                                       rt_uint8_t  cmd,
+                                       int         cmd,
                                        void       *args)
 {
     switch (cmd)

components/drivers/spi/spi_flash_at45dbxx.c

@@ -117,7 +117,7 @@ static rt_err_t AT45DB_flash_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t AT45DB_flash_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t AT45DB_flash_control(rt_device_t dev, int cmd, void *args)
 {
     RT_ASSERT(dev != RT_NULL);
 

components/drivers/spi/spi_flash_gd.c

@@ -195,7 +195,7 @@ static rt_err_t w25qxx_flash_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t w25qxx_flash_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t w25qxx_flash_control(rt_device_t dev, int cmd, void *args)
 {
     RT_ASSERT(dev != RT_NULL);
 

components/drivers/spi/spi_flash_sfud.c

@@ -49,7 +49,7 @@ static char log_buf[RT_CONSOLEBUF_SIZE];
 
 void sfud_log_debug(const char *file, const long line, const char *format, ...);
 
-static rt_err_t rt_sfud_control(rt_device_t dev, rt_uint8_t cmd, void *args) {
+static rt_err_t rt_sfud_control(rt_device_t dev, int cmd, void *args) {
     RT_ASSERT(dev != RT_NULL);
 
     switch (cmd) {

components/drivers/spi/spi_flash_sst25vfxx.c

@@ -173,7 +173,7 @@ static rt_err_t sst25vfxx_flash_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t sst25vfxx_flash_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t sst25vfxx_flash_control(rt_device_t dev, int cmd, void *args)
 {
     struct spi_flash_sst25vfxx * spi_flash;
 

components/drivers/spi/spi_flash_w25qxx.c

@@ -205,7 +205,7 @@ static rt_err_t w25qxx_flash_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_err_t w25qxx_flash_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t w25qxx_flash_control(rt_device_t dev, int cmd, void *args)
 {
     RT_ASSERT(dev != RT_NULL);
 

components/drivers/spi/spi_wifi_rw009.c

@@ -530,7 +530,7 @@ static rt_size_t rw009_wifi_write(rt_device_t dev, rt_off_t pos, const void *buf
     return 0;
 }
 
-static rt_err_t rw009_wifi_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rw009_wifi_control(rt_device_t dev, int cmd, void *args)
 {
     struct rw009_wifi *wifi_device = (struct rw009_wifi *)dev;
     rt_err_t result = RT_EOK;

components/drivers/src/ringbuffer.c

@@ -21,18 +21,31 @@
  * Date           Author       Notes
  * 2012-09-30     Bernard      first version.
  * 2013-05-08     Grissiom     reimplement
+ * 2016-08-18     heyuanjie    add interface
  */
 
 #include <rtthread.h>
 #include <rtdevice.h>
 #include <string.h>
 
+rt_inline enum rt_ringbuffer_state rt_ringbuffer_status(struct rt_ringbuffer *rb)
+{
+    if (rb->read_index == rb->write_index)
+    {
+        if (rb->read_mirror == rb->write_mirror)
+            return RT_RINGBUFFER_EMPTY;
+        else
+            return RT_RINGBUFFER_FULL;
+    }
+    return RT_RINGBUFFER_HALFFULL;
+}
+
 void rt_ringbuffer_init(struct rt_ringbuffer *rb,
                         rt_uint8_t           *pool,
                         rt_int16_t            size)
 {
     RT_ASSERT(rb != RT_NULL);
-    RT_ASSERT(size > 0)
+    RT_ASSERT(size > 0);
 
     /* initialize read and write index */
     rb->read_mirror = rb->read_index = 0;
@@ -284,3 +297,76 @@ rt_size_t rt_ringbuffer_getchar(struct rt_ringbuffer *rb, rt_uint8_t *ch)
 }
 RTM_EXPORT(rt_ringbuffer_getchar);
 
+/** 
+ * get the size of data in rb 
+ */
+rt_size_t rt_ringbuffer_data_len(struct rt_ringbuffer *rb)
+{
+    switch (rt_ringbuffer_status(rb))
+    {
+    case RT_RINGBUFFER_EMPTY:
+        return 0;
+    case RT_RINGBUFFER_FULL:
+        return rb->buffer_size;
+    case RT_RINGBUFFER_HALFFULL:
+    default:
+        if (rb->write_index > rb->read_index)
+            return rb->write_index - rb->read_index;
+        else
+            return rb->buffer_size - (rb->read_index - rb->write_index);
+    };
+}
+RTM_EXPORT(rt_ringbuffer_data_len);
+
+/** 
+ * empty the rb 
+ */
+void rt_ringbuffer_reset(struct rt_ringbuffer *rb)
+{
+    RT_ASSERT(rb != RT_NULL);
+
+    rb->read_mirror = 0;
+    rb->read_index = 0;
+    rb->write_mirror = 0;
+    rb->write_index = 0;
+}
+RTM_EXPORT(rt_ringbuffer_reset);
+
+#ifdef RT_USING_HEAP
+
+struct rt_ringbuffer* rt_ringbuffer_create(rt_uint16_t size)
+{
+    struct rt_ringbuffer *rb;
+    rt_uint8_t *pool;
+
+	RT_ASSERT(size > 0);
+
+    size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
+
+    rb = rt_malloc(sizeof(struct rt_ringbuffer));
+    if (rb == RT_NULL)
+        goto exit;
+
+    pool = rt_malloc(size);
+    if (pool == RT_NULL)
+    {
+        rt_free(rb);
+        goto exit;
+    }
+    rt_ringbuffer_init(rb, pool, size);
+
+exit:
+    return rb;
+}
+RTM_EXPORT(rt_ringbuffer_create);
+
+void rt_ringbuffer_destroy(struct rt_ringbuffer *rb)
+{
+    RT_ASSERT(rb != RT_NULL);
+
+    rt_free(rb->buffer_ptr);
+    rt_free(rb);
+}
+RTM_EXPORT(rt_ringbuffer_destroy);
+
+#endif

components/drivers/src/waitqueue.c

@@ -0,0 +1,101 @@
+#include <stdint.h>
+
+#include <rthw.h>
+#include <rtdevice.h>
+#include <rtservice.h>
+
+extern struct rt_thread *rt_current_thread;
+
+void rt_wqueue_add(rt_wqueue_t *queue, struct rt_wqueue_node *node)
+{
+    rt_base_t level;
+
+    level = rt_hw_interrupt_disable();
+    rt_list_insert_before(queue, &(node->list));
+    rt_hw_interrupt_enable(level);
+}
+
+void rt_wqueue_remove(struct rt_wqueue_node *node)
+{
+    rt_base_t level;
+
+    level = rt_hw_interrupt_disable();
+    rt_list_remove(&(node->list));
+    rt_hw_interrupt_enable(level);
+}
+
+int __wqueue_default_wake(struct rt_wqueue_node *wait, void *key)
+{
+    return 0;
+}
+
+void rt_wqueue_wakeup(rt_wqueue_t *queue, void *key)
+{
+    rt_base_t level;
+    register int need_schedule = 0;
+
+    struct rt_list_node *node;
+    struct rt_wqueue_node *entry;
+
+    if (rt_list_isempty(queue))
+        return;
+
+    level = rt_hw_interrupt_disable();
+    for (node = queue->next; node != queue; node = node->next)
+    {
+        entry = rt_list_entry(node, struct rt_wqueue_node, list);
+        if (entry->wakeup(entry, key) == 0)
+        {
+            rt_thread_resume(entry->polling_thread);
+            need_schedule = 1;
+
+            rt_wqueue_remove(entry);
+            break;
+        }
+    }
+    rt_hw_interrupt_enable(level);
+
+    if (need_schedule)
+        rt_schedule();
+}
+
+int rt_wqueue_wait(rt_wqueue_t *queue, int condition, int msec)
+{
+    int tick;
+    rt_thread_t tid = rt_current_thread;
+    rt_timer_t  tmr = &(tid->thread_timer);
+    struct rt_wqueue_node __wait;
+
+    tick = rt_tick_from_millisecond(msec);
+
+    if ((condition) || (tick == 0))
+        return 0;
+
+    __wait.polling_thread = rt_thread_self();
+    __wait.key = 0;
+    __wait.wakeup = __wqueue_default_wake;
+    rt_list_init(&__wait.list);
+
+    rt_wqueue_add(queue, &__wait);
+
+    /* current context checking */
+    RT_DEBUG_NOT_IN_INTERRUPT;
+    rt_thread_suspend(tid);
+
+    /* start timer */
+    if (tick != RT_WAITING_FOREVER)
+    {
+        rt_timer_control(tmr,
+                         RT_TIMER_CTRL_SET_TIME,
+                         &tick);
+
+        rt_timer_start(tmr);
+    }
+
+    rt_schedule();
+
+    rt_wqueue_remove(&__wait);
+
+    return 0;
+}
+

components/drivers/watchdog/watchdog.c

@@ -67,7 +67,7 @@ static rt_err_t rt_watchdog_close(struct rt_device *dev)
 }
 
 static rt_err_t rt_watchdog_control(struct rt_device *dev,
-                                    rt_uint8_t        cmd,
+                                    int              cmd,
                                     void             *args)
 {
     rt_watchdog_t *wtd;