[Kernel] Add device ops feature.

32 files changed, 706 insertions, 172 deletions

diff --git a/components/drivers/audio/audio.c b/components/drivers/audio/audio.c
index 87bb726058..220a000df1 100644
--- a/components/drivers/audio/audio.c
+++ b/components/drivers/audio/audio.c
@@ -421,6 +421,18 @@ static rt_err_t _audio_dev_control(struct rt_device *dev, int cmd, void *args)
     return result;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops audio_ops =
+{
+    _audio_dev_init,
+    _audio_dev_open,
+    _audio_dev_close,
+    _audio_dev_read,
+    _audio_dev_write,
+    _audio_dev_control
+};
+#endif
+
 rt_err_t rt_audio_register(struct rt_audio_device *audio, const char *name, rt_uint32_t flag, void *data)
 {
     struct rt_device *device;
@@ -431,12 +443,16 @@ rt_err_t rt_audio_register(struct rt_audio_device *audio, const char *name, rt_u
     device->rx_indicate = RT_NULL;
     device->tx_complete = RT_NULL;
 
-    device->init = _audio_dev_init;
-    device->open = _audio_dev_open;
-    device->close = _audio_dev_close;
-    device->read = _audio_dev_read;
-    device->write = _audio_dev_write;
+#ifdef RT_USING_DEVICE_OPS
+    device->ops  = &audio_ops;
+#else
+    device->init    = _audio_dev_init;
+    device->open    = _audio_dev_open;
+    device->close   = _audio_dev_close;
+    device->read    = _audio_dev_read;
+    device->write   = _audio_dev_write;
     device->control = _audio_dev_control;
+#endif
     device->user_data = data;
 
     //init memory pool for replay
diff --git a/components/drivers/audio/audio_pipe.c b/components/drivers/audio/audio_pipe.c
index abef1557a4..9dc296831e 100644
--- a/components/drivers/audio/audio_pipe.c
+++ b/components/drivers/audio/audio_pipe.c
@@ -193,14 +193,26 @@ static rt_size_t rt_pipe_write(rt_device_t dev,
 static rt_err_t rt_pipe_control(rt_device_t dev, int cmd, void *args)
 {
     struct rt_audio_pipe *pipe;
-    
+
     pipe = (struct rt_audio_pipe *)dev;
-    
+
     if (cmd == PIPE_CTRL_GET_SPACE && args)
         *(rt_size_t*)args = rt_ringbuffer_space_len(&pipe->ringbuffer);
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops audio_pipe_ops
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    rt_pipe_read,
+    rt_pipe_write,
+    rt_pipe_control
+};
+#endif
+
 /**
  * This function will initialize a pipe device and put it under control of
  * resource management.
@@ -233,12 +245,16 @@ rt_err_t rt_audio_pipe_init(struct rt_audio_pipe *pipe,
 
     /* create pipe */
     pipe->parent.type    = RT_Device_Class_Pipe;
+#ifdef RT_USING_DEVICE_OPS
+    pipe->parent.ops     = &audio_pipe_ops;
+#else
     pipe->parent.init    = RT_NULL;
     pipe->parent.open    = RT_NULL;
     pipe->parent.close   = RT_NULL;
     pipe->parent.read    = rt_pipe_read;
     pipe->parent.write   = rt_pipe_write;
     pipe->parent.control = rt_pipe_control;
+#endif
 
     return rt_device_register(&(pipe->parent), name, RT_DEVICE_FLAG_RDWR);
 }
diff --git a/components/drivers/can/can.c b/components/drivers/can/can.c
index 000745514c..98d76cd5b3 100644
--- a/components/drivers/can/can.c
+++ b/components/drivers/can/can.c
@@ -687,6 +687,18 @@ static void cantimeout(void *arg)
     }
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops can_device_ops =
+{
+    rt_can_init,
+    rt_can_open,
+    rt_can_close,
+    rt_can_read,
+    rt_can_write,
+    rt_can_control
+};
+#endif
+
 /*
  * can register
  */
@@ -712,12 +724,17 @@ rt_err_t rt_hw_can_register(struct rt_can_device *can,
 #ifdef RT_CAN_USING_BUS_HOOK
     can->bus_hook       = RT_NULL;
 #endif /*RT_CAN_USING_BUS_HOOK*/
+
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &can_device_ops;
+#else
     device->init        = rt_can_init;
     device->open        = rt_can_open;
     device->close       = rt_can_close;
     device->read        = rt_can_read;
     device->write       = rt_can_write;
     device->control     = rt_can_control;
+#endif
     can->ops            = ops;
 
     can->status_indicate.ind  = RT_NULL;
diff --git a/components/drivers/hwtimer/hwtimer.c b/components/drivers/hwtimer/hwtimer.c
index 066c5f6f6c..c3e5076343 100644
--- a/components/drivers/hwtimer/hwtimer.c
+++ b/components/drivers/hwtimer/hwtimer.c
@@ -35,13 +35,13 @@ rt_inline rt_uint32_t timeout_calc(rt_hwtimer_t *timer, rt_hwtimerval_t *tv)
     float devi_min = 1;
     float devi;
 
-    /* �Ѷ�ʱ�����ʱ��Ͷ�ʱʱ�任����� */
+    /* changed to second */
     overflow = timer->info->maxcnt/(float)timer->freq;
     tv_sec = tv->sec + tv->usec/(float)1000000;
 
     if (tv_sec < (1/(float)timer->freq))
     {
-        /* ��ʱʱ��С�ڼ������� */
+        /* little timeout */
         i = 0;
         timeout = 1/(float)timer->freq;
     }
@@ -55,7 +55,7 @@ rt_inline rt_uint32_t timeout_calc(rt_hwtimer_t *timer, rt_hwtimerval_t *tv)
             {
                 counter = timeout*timer->freq;
                 devi = tv_sec - (counter/(float)timer->freq)*i;
-                /* ��������� */
+                /* Minimum calculation error */
                 if (devi > devi_min)
                 {
                     i = index;
@@ -89,7 +89,7 @@ static rt_err_t rt_hwtimer_init(struct rt_device *dev)
     rt_hwtimer_t *timer;
 
     timer = (rt_hwtimer_t *)dev;
-    /* ���Խ�Ĭ�ϼ���Ƶ����Ϊ1Mhz */
+    /* try to change to 1MHz */
     if ((1000000 <= timer->info->maxfreq) && (1000000 >= timer->info->minfreq))
     {
         timer->freq = 1000000;
@@ -330,6 +330,18 @@ void rt_device_hwtimer_isr(rt_hwtimer_t *timer)
     }
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops hwtimer_ops = 
+{
+    rt_hwtimer_init,
+    rt_hwtimer_open,
+    rt_hwtimer_close,
+    rt_hwtimer_read,
+    rt_hwtimer_write,
+    rt_hwtimer_control
+};
+#endif
+
 rt_err_t rt_device_hwtimer_register(rt_hwtimer_t *timer, const char *name, void *user_data)
 {
     struct rt_device *device;
@@ -344,12 +356,16 @@ rt_err_t rt_device_hwtimer_register(rt_hwtimer_t *timer, const char *name, void
     device->rx_indicate = RT_NULL;
     device->tx_complete = RT_NULL;
 
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &hwtimer_ops;
+#else
     device->init        = rt_hwtimer_init;
     device->open        = rt_hwtimer_open;
     device->close       = rt_hwtimer_close;
     device->read        = rt_hwtimer_read;
     device->write       = rt_hwtimer_write;
     device->control     = rt_hwtimer_control;
+#endif
     device->user_data   = user_data;
 
     return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);
diff --git a/components/drivers/i2c/fm24clxx.c b/components/drivers/i2c/fm24clxx.c
index c37a62973a..bb77d707bf 100644
--- a/components/drivers/i2c/fm24clxx.c
+++ b/components/drivers/i2c/fm24clxx.c
@@ -132,6 +132,18 @@ static rt_size_t fm24clxx_write(rt_device_t dev, rt_off_t pos, const void *buffe
     return (ret == 2) ? size : 0;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device fm24clxx_ops =
+{
+    fm24clxx_init,
+    fm24clxx_open,
+    fm24clxx_close,
+    fm24clxx_read,
+    fm24clxx_write,
+    fm24clxx_control
+};
+#endif
+
 rt_err_t fm24clxx_register(const char *fm_device_name, const char *i2c_bus, void *user_data)
 {
     static struct fm24clxx_device fm24clxx_drv;
@@ -145,12 +157,17 @@ rt_err_t fm24clxx_register(const char *fm_device_name, const char *i2c_bus, void
 
     fm24clxx_drv.bus = bus;
     fm24clxx_drv.parent.type      = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+    fm24clxx_drv.parent.ops       = &fm24clxx_ops;
+#else
     fm24clxx_drv.parent.init      = fm24clxx_init;
     fm24clxx_drv.parent.open      = fm24clxx_open;
     fm24clxx_drv.parent.close     = fm24clxx_close;
     fm24clxx_drv.parent.read      = fm24clxx_read;
     fm24clxx_drv.parent.write     = fm24clxx_write;
     fm24clxx_drv.parent.control   = fm24clxx_control;
+#endif
+
     fm24clxx_drv.parent.user_data = user_data;
 
     return rt_device_register(&fm24clxx_drv.parent, fm_device_name, RT_DEVICE_FLAG_RDWR);
diff --git a/components/drivers/i2c/i2c_dev.c b/components/drivers/i2c/i2c_dev.c
index 5713a28936..042b7b743a 100644
--- a/components/drivers/i2c/i2c_dev.c
+++ b/components/drivers/i2c/i2c_dev.c
@@ -102,6 +102,18 @@ static rt_err_t i2c_bus_device_control(rt_device_t dev,
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops i2c_ops = 
+{
+    RT_NULL, 
+    RT_NULL,
+    RT_NULL,
+    i2c_bus_device_read,
+    i2c_bus_device_write,
+    i2c_bus_device_control
+};
+#endif
+
 rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus,
                                        const char               *name)
 {
@@ -115,12 +127,16 @@ rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus,
     /* set device type */
     device->type    = RT_Device_Class_I2CBUS;
     /* initialize device interface */
+#ifdef RT_USING_DEVICE_OPS
+    device->ops     = &i2c_ops;
+#else
     device->init    = RT_NULL;
     device->open    = RT_NULL;
     device->close   = RT_NULL;
     device->read    = i2c_bus_device_read;
     device->write   = i2c_bus_device_write;
     device->control = i2c_bus_device_control;
+#endif
 
     /* register to device manager */
     rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
diff --git a/components/drivers/misc/pin.c b/components/drivers/misc/pin.c
index 9ed827f0b5..dc2137eb17 100644
--- a/components/drivers/misc/pin.c
+++ b/components/drivers/misc/pin.c
@@ -76,18 +76,34 @@ static rt_err_t  _pin_control(rt_device_t dev, int cmd, void *args)
     return 0;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops pin_ops =
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _pin_read,
+    _pin_write,
+    _pin_control
+};
+#endif
+
 int rt_device_pin_register(const char *name, const struct rt_pin_ops *ops, void *user_data)
 {
     _hw_pin.parent.type         = RT_Device_Class_Miscellaneous;
     _hw_pin.parent.rx_indicate  = RT_NULL;
     _hw_pin.parent.tx_complete  = RT_NULL;
 
+#ifdef RT_USING_DEVICE_OPS
+    _hw_pin.parent.ops          = &pin_ops;
+#else
     _hw_pin.parent.init         = RT_NULL;
     _hw_pin.parent.open         = RT_NULL;
     _hw_pin.parent.close        = RT_NULL;
     _hw_pin.parent.read         = _pin_read;
     _hw_pin.parent.write        = _pin_write;
     _hw_pin.parent.control      = _pin_control;
+#endif
 
     _hw_pin.ops                 = ops;
     _hw_pin.parent.user_data    = user_data;
@@ -117,6 +133,7 @@ rt_err_t rt_pin_dettach_irq(rt_int32_t pin)
     }
     return RT_ENOSYS;
 }
+
 rt_err_t rt_pin_irq_enable(rt_base_t pin, rt_uint32_t enabled)
 {
     RT_ASSERT(_hw_pin.ops != RT_NULL);
@@ -126,6 +143,7 @@ rt_err_t rt_pin_irq_enable(rt_base_t pin, rt_uint32_t enabled)
     }
     return RT_ENOSYS;
 }
+
 /* RT-Thread Hardware PIN APIs */
 void rt_pin_mode(rt_base_t pin, rt_base_t mode)
 {
diff --git a/components/drivers/mtd/mtd_nand.c b/components/drivers/mtd/mtd_nand.c
index 8cd0a03d5d..bf22d889ce 100644
--- a/components/drivers/mtd/mtd_nand.c
+++ b/components/drivers/mtd/mtd_nand.c
@@ -69,6 +69,18 @@ static rt_err_t _mtd_control(rt_device_t dev, int cmd, void *args)
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops mtd_nand_ops = 
+{
+    _mtd_init,
+    _mtd_open,
+    _mtd_close,
+    _mtd_read,
+    _mtd_write,
+    _mtd_control
+};
+#endif
+
 rt_err_t rt_mtd_nand_register_device(const char                *name,
                                      struct rt_mtd_nand_device *device)
 {
@@ -79,12 +91,16 @@ rt_err_t rt_mtd_nand_register_device(const char                *name,
 
     /* set device class and generic device interface */
     dev->type        = RT_Device_Class_MTD;
+#ifdef RT_USING_DEVICE_OPS
+	dev->ops         = &mtd_nand_ops;
+#else
     dev->init        = _mtd_init;
     dev->open        = _mtd_open;
     dev->read        = _mtd_read;
     dev->write       = _mtd_write;
     dev->close       = _mtd_close;
     dev->control     = _mtd_control;
+#endif
 
     dev->rx_indicate = RT_NULL;
     dev->tx_complete = RT_NULL;
diff --git a/components/drivers/mtd/mtd_nor.c b/components/drivers/mtd/mtd_nor.c
index 72bbc5a873..8f37e95f09 100644
--- a/components/drivers/mtd/mtd_nor.c
+++ b/components/drivers/mtd/mtd_nor.c
@@ -65,6 +65,18 @@ static rt_err_t _mtd_control(rt_device_t dev, int cmd, void *args)
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops mtd_nor_ops = 
+{
+    _mtd_init,
+    _mtd_open,
+    _mtd_close,
+    _mtd_read,
+    _mtd_write,
+    _mtd_control
+};
+#endif
+
 rt_err_t rt_mtd_nor_register_device(const char               *name,
                                     struct rt_mtd_nor_device *device)
 {
@@ -75,12 +87,16 @@ rt_err_t rt_mtd_nor_register_device(const char               *name,
 
     /* set device class and generic device interface */
     dev->type        = RT_Device_Class_MTD;
+#ifdef RT_USING_DEVICE_OPS
+    dev->ops         = &mtd_nor_ops;
+#else
     dev->init        = _mtd_init;
     dev->open        = _mtd_open;
     dev->read        = _mtd_read;
     dev->write       = _mtd_write;
     dev->close       = _mtd_close;
     dev->control     = _mtd_control;
+#endif
 
     dev->rx_indicate = RT_NULL;
     dev->tx_complete = RT_NULL;
diff --git a/components/drivers/rtc/soft_rtc.c b/components/drivers/rtc/soft_rtc.c
index 6db2136ad4..c828e43ebc 100644
--- a/components/drivers/rtc/soft_rtc.c
+++ b/components/drivers/rtc/soft_rtc.c
@@ -68,6 +68,18 @@ static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops soft_rtc_ops = 
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    soft_rtc_control
+};
+#endif
+
 int rt_soft_rtc_init(void)
 {
     static rt_bool_t init_ok = RT_FALSE;
@@ -86,12 +98,16 @@ int rt_soft_rtc_init(void)
     soft_rtc_dev.type    = RT_Device_Class_RTC;
 
     /* register rtc device */
+#ifdef RT_USING_DEVICE_OPS
+    soft_rtc_dev.ops     = &soft_rtc_ops;
+#else
     soft_rtc_dev.init    = RT_NULL;
     soft_rtc_dev.open    = RT_NULL;
     soft_rtc_dev.close   = RT_NULL;
     soft_rtc_dev.read    = RT_NULL;
     soft_rtc_dev.write   = RT_NULL;
     soft_rtc_dev.control = soft_rtc_control;
+#endif
 
     /* no private */
     soft_rtc_dev.user_data = RT_NULL;
diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index 4143272b80..14a01acd90 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -319,6 +319,18 @@ static rt_int32_t mmcsd_set_blksize(struct rt_mmcsd_card *card)
     return 0;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops mmcsd_blk_ops = 
+{
+    rt_mmcsd_init,
+    rt_mmcsd_open,
+    rt_mmcsd_close,
+    rt_mmcsd_read,
+    rt_mmcsd_write,
+    rt_mmcsd_control
+};
+#endif
+
 rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
 {
     rt_int32_t err = 0;
@@ -366,13 +378,17 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
                 blk_dev->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);
     
                 /* register mmcsd device */
-                blk_dev->dev.type = RT_Device_Class_Block;                  
+                blk_dev->dev.type = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+                blk_dev->dev.ops  = &mmcsd_blk_ops;
+#else
                 blk_dev->dev.init = rt_mmcsd_init;
                 blk_dev->dev.open = rt_mmcsd_open;
                 blk_dev->dev.close = rt_mmcsd_close;
                 blk_dev->dev.read = rt_mmcsd_read;
                 blk_dev->dev.write = rt_mmcsd_write;
                 blk_dev->dev.control = rt_mmcsd_control;
+#endif
                 blk_dev->dev.user_data = blk_dev;
 
                 blk_dev->card = card;
@@ -396,12 +412,16 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
     
                     /* register mmcsd device */
                     blk_dev->dev.type  = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+                    blk_dev->dev.ops  = &mmcsd_blk_ops;
+#else
                     blk_dev->dev.init = rt_mmcsd_init;
                     blk_dev->dev.open = rt_mmcsd_open;
                     blk_dev->dev.close = rt_mmcsd_close;
                     blk_dev->dev.read = rt_mmcsd_read;
                     blk_dev->dev.write = rt_mmcsd_write;
                     blk_dev->dev.control = rt_mmcsd_control;
+#endif
                     blk_dev->dev.user_data = blk_dev;
 
                     blk_dev->card = card;
@@ -482,6 +502,3 @@ int rt_mmcsd_blk_init(void)
     /* nothing */
     return 0;
 }
-
-INIT_PREV_EXPORT(rt_mmcsd_blk_init);
-
diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index 645d083283..1de1331344 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -1072,6 +1072,18 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
     return ret;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops serial_ops = 
+{
+    rt_serial_init,
+    rt_serial_open,
+    rt_serial_close,
+    rt_serial_read,
+    rt_serial_write,
+    rt_serial_control
+};
+#endif
+
 /*
  * serial register
  */
@@ -1090,12 +1102,16 @@ rt_err_t rt_hw_serial_register(struct rt_serial_device *serial,
     device->rx_indicate = RT_NULL;
     device->tx_complete = RT_NULL;
 
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &serial_ops;
+#else
     device->init        = rt_serial_init;
     device->open        = rt_serial_open;
     device->close       = rt_serial_close;
     device->read        = rt_serial_read;
     device->write       = rt_serial_write;
     device->control     = rt_serial_control;
+#endif
     device->user_data   = data;
 
     /* register a character device */
diff --git a/components/drivers/spi/enc28j60.c b/components/drivers/spi/enc28j60.c
index 1daaea367a..b37b2244e5 100644
--- a/components/drivers/spi/enc28j60.c
+++ b/components/drivers/spi/enc28j60.c
@@ -741,6 +741,18 @@ static struct pbuf *enc28j60_rx(rt_device_t dev)
     return p;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops enc28j60_ops = 
+{
+    enc28j60_init,
+    enc28j60_open,
+    enc28j60_close,
+    enc28j60_read,
+    enc28j60_write,
+    enc28j60_control
+};
+#endif
+
 rt_err_t enc28j60_attach(const char *spi_device_name)
 {
     struct rt_spi_device *spi_device;
@@ -802,12 +814,16 @@ rt_err_t enc28j60_attach(const char *spi_device_name)
 
     /* init rt-thread device struct */
     enc28j60_dev.parent.parent.type    = RT_Device_Class_NetIf;
+#ifdef RT_USING_DEVICE_OPS
+    enc28j60_dev.parent.parent.ops     = &enc28j60_ops;
+#else
     enc28j60_dev.parent.parent.init    = enc28j60_init;
     enc28j60_dev.parent.parent.open    = enc28j60_open;
     enc28j60_dev.parent.parent.close   = enc28j60_close;
     enc28j60_dev.parent.parent.read    = enc28j60_read;
     enc28j60_dev.parent.parent.write   = enc28j60_write;
     enc28j60_dev.parent.parent.control = enc28j60_control;
+#endif
 
     /* init rt-thread ethernet device struct */
     enc28j60_dev.parent.eth_rx  = enc28j60_rx;
diff --git a/components/drivers/spi/spi_dev.c b/components/drivers/spi/spi_dev.c
index eca971a6e7..1e69ebe591 100644
--- a/components/drivers/spi/spi_dev.c
+++ b/components/drivers/spi/spi_dev.c
@@ -69,6 +69,18 @@ static rt_err_t _spi_bus_device_control(rt_device_t dev,
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops spi_bus_ops = 
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _spi_bus_device_read,
+    _spi_bus_device_write,
+    _spi_bus_device_control
+};
+#endif
+
 rt_err_t rt_spi_bus_device_init(struct rt_spi_bus *bus, const char *name)
 {
     struct rt_device *device;
@@ -79,12 +91,16 @@ rt_err_t rt_spi_bus_device_init(struct rt_spi_bus *bus, const char *name)
     /* set device type */
     device->type    = RT_Device_Class_SPIBUS;
     /* initialize device interface */
+#ifdef RT_USING_DEVICE_OPS
+    device->ops     = &spi_bus_ops;
+#else
     device->init    = RT_NULL;
     device->open    = RT_NULL;
     device->close   = RT_NULL;
     device->read    = _spi_bus_device_read;
     device->write   = _spi_bus_device_write;
     device->control = _spi_bus_device_control;
+#endif
 
     /* register to device manager */
     return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
@@ -134,6 +150,18 @@ static rt_err_t _spidev_device_control(rt_device_t dev,
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops spi_device_ops = 
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _spidev_device_read,
+    _spidev_device_write,
+    _spidev_device_control
+};
+#endif
+
 rt_err_t rt_spidev_device_init(struct rt_spi_device *dev, const char *name)
 {
     struct rt_device *device;
@@ -143,13 +171,17 @@ rt_err_t rt_spidev_device_init(struct rt_spi_device *dev, const char *name)
 
     /* set device type */
     device->type    = RT_Device_Class_SPIDevice;
+#ifdef RT_USING_DEVICE_OPS
+    device->ops     = &spi_device_ops;
+#else
     device->init    = RT_NULL;
     device->open    = RT_NULL;
     device->close   = RT_NULL;
     device->read    = _spidev_device_read;
     device->write   = _spidev_device_write;
     device->control = _spidev_device_control;
-    
+#endif
+
     /* register to device manager */
     return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
 }
diff --git a/components/drivers/spi/spi_flash_gd.c b/components/drivers/spi/spi_flash_gd.c
index df41150a5d..a8e8f9a4b8 100644
--- a/components/drivers/spi/spi_flash_gd.c
+++ b/components/drivers/spi/spi_flash_gd.c
@@ -1,7 +1,7 @@
 /*
  * File      : spi_flash_gd.c
  * This file is part of RT-Thread RTOS
- *  Copyright (c) 2016 Shanghai Fullhan Microelectronics Co., Ltd. 
+ *  Copyright (c) 2016 Shanghai Fullhan Microelectronics Co., Ltd.
  *  All rights reserved
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -254,6 +254,18 @@ static rt_size_t w25qxx_flash_write(rt_device_t dev,
     return size;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops gd_device_ops =
+{
+    w25qxx_flash_init,
+    w25qxx_flash_open,
+    w25qxx_flash_close,
+    w25qxx_flash_read,
+    w25qxx_flash_write,
+    w25qxx_flash_control
+};
+#endif
+
 rt_err_t gd_init(const char * flash_device_name, const char * spi_device_name)
 {
     struct rt_spi_device * rt_spi_device;
@@ -330,12 +342,16 @@ rt_err_t gd_init(const char * flash_device_name, const char * spi_device_name)
 
     /* register device */
     spi_flash_device.flash_device.type    = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+    spi_flash_device.flash_device.ops     = &gd_device_ops;
+#else
     spi_flash_device.flash_device.init    = w25qxx_flash_init;
     spi_flash_device.flash_device.open    = w25qxx_flash_open;
     spi_flash_device.flash_device.close   = w25qxx_flash_close;
     spi_flash_device.flash_device.read    = w25qxx_flash_read;
     spi_flash_device.flash_device.write   = w25qxx_flash_write;
     spi_flash_device.flash_device.control = w25qxx_flash_control;
+#endif
     /* no private */
     spi_flash_device.flash_device.user_data = RT_NULL;
 
diff --git a/components/drivers/spi/spi_flash_sfud.c b/components/drivers/spi/spi_flash_sfud.c
index 2e97644fa4..c4fd1e0208 100644
--- a/components/drivers/spi/spi_flash_sfud.c
+++ b/components/drivers/spi/spi_flash_sfud.c
@@ -225,6 +225,18 @@ sfud_err sfud_spi_port_init(sfud_flash *flash) {
     return result;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops flash_device_ops = 
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    rt_sfud_read,
+    rt_sfud_write,
+    rt_sfud_control
+};
+#endif
+
 /**
  * Probe SPI flash by SFUD(Serial Flash Universal Driver) driver library and though SPI device.
  *
@@ -255,7 +267,7 @@ rt_spi_flash_device_t rt_sfud_flash_probe(const char *spi_flash_dev_name, const
         /* initialize lock */
         rt_mutex_init(&(rtt_dev->lock), spi_flash_dev_name, RT_IPC_FLAG_FIFO);
     }
-    
+
     if (rtt_dev && sfud_dev && spi_flash_dev_name_bak && spi_dev_name_bak) {
         rt_memset(sfud_dev, 0, sizeof(sfud_flash));
         rt_strncpy(spi_flash_dev_name_bak, spi_flash_dev_name, rt_strlen(spi_flash_dev_name));
@@ -294,12 +306,16 @@ rt_spi_flash_device_t rt_sfud_flash_probe(const char *spi_flash_dev_name, const
 
         /* register device */
         rtt_dev->flash_device.type = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+        rtt_dev->flash_device.ops  = &flash_device_ops;
+#else
         rtt_dev->flash_device.init = RT_NULL;
         rtt_dev->flash_device.open = RT_NULL;
         rtt_dev->flash_device.close = RT_NULL;
         rtt_dev->flash_device.read = rt_sfud_read;
         rtt_dev->flash_device.write = rt_sfud_write;
         rtt_dev->flash_device.control = rt_sfud_control;
+#endif
 
         rt_device_register(&(rtt_dev->flash_device), spi_flash_dev_name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);
 
diff --git a/components/drivers/spi/spi_flash_sst25vfxx.c b/components/drivers/spi/spi_flash_sst25vfxx.c
index 3843d20ff2..35dcf3fff7 100644
--- a/components/drivers/spi/spi_flash_sst25vfxx.c
+++ b/components/drivers/spi/spi_flash_sst25vfxx.c
@@ -254,6 +254,18 @@ static rt_size_t sst25vfxx_flash_write(rt_device_t dev, rt_off_t pos, const void
     return size;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops sst25vfxx_device_ops =
+{
+    sst25vfxx_flash_init,
+    sst25vfxx_flash_open,
+    sst25vfxx_flash_close,
+    sst25vfxx_flash_read,
+    sst25vfxx_flash_write,
+    sst25vfxx_flash_control
+};
+#endif
+
 rt_err_t sst25vfxx_init(const char * flash_device_name, const char * spi_device_name)
 {
     struct rt_spi_device * rt_spi_device;
@@ -340,12 +352,16 @@ rt_err_t sst25vfxx_init(const char * flash_device_name, const char * spi_device_
 
     /* register device */
     spi_flash->flash_device.type    = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+    spi_flash->flash_device.ops     = &sst25vfxx_device_ops;
+#else
     spi_flash->flash_device.init    = sst25vfxx_flash_init;
     spi_flash->flash_device.open    = sst25vfxx_flash_open;
     spi_flash->flash_device.close   = sst25vfxx_flash_close;
     spi_flash->flash_device.read    = sst25vfxx_flash_read;
     spi_flash->flash_device.write   = sst25vfxx_flash_write;
     spi_flash->flash_device.control = sst25vfxx_flash_control;
+#endif
     /* no private */
     spi_flash->flash_device.user_data = RT_NULL;
 
diff --git a/components/drivers/spi/spi_flash_w25qxx.c b/components/drivers/spi/spi_flash_w25qxx.c
index a413aec673..5a16ffbae2 100644
--- a/components/drivers/spi/spi_flash_w25qxx.c
+++ b/components/drivers/spi/spi_flash_w25qxx.c
@@ -264,6 +264,18 @@ static rt_size_t w25qxx_flash_write(rt_device_t dev,
     return size;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops w25qxx_device_ops =
+{
+    w25qxx_flash_init,
+    w25qxx_flash_open,
+    w25qxx_flash_close,
+    w25qxx_flash_read,
+    w25qxx_flash_write,
+    w25qxx_flash_control
+};
+#endif
+
 rt_err_t w25qxx_init(const char * flash_device_name, const char * spi_device_name)
 {
     struct rt_spi_device * rt_spi_device;
@@ -375,12 +387,16 @@ rt_err_t w25qxx_init(const char * flash_device_name, const char * spi_device_nam
 
     /* register device */
     spi_flash_device.flash_device.type    = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+    spi_flash_device.flash_device.ops     = &w25qxx_device_ops;
+#else
     spi_flash_device.flash_device.init    = w25qxx_flash_init;
     spi_flash_device.flash_device.open    = w25qxx_flash_open;
     spi_flash_device.flash_device.close   = w25qxx_flash_close;
     spi_flash_device.flash_device.read    = w25qxx_flash_read;
     spi_flash_device.flash_device.write   = w25qxx_flash_write;
     spi_flash_device.flash_device.control = w25qxx_flash_control;
+#endif
     /* no private */
     spi_flash_device.flash_device.user_data = RT_NULL;
 
diff --git a/components/drivers/spi/spi_msd.c b/components/drivers/spi/spi_msd.c
index 5e9ae6289e..a3046e14ba 100644
--- a/components/drivers/spi/spi_msd.c
+++ b/components/drivers/spi/spi_msd.c
@@ -47,10 +47,14 @@ static void MSD_release_cs(struct rt_spi_device *device);
 
 static rt_err_t _wait_token(struct rt_spi_device *device, uint8_t token);
 static rt_err_t _wait_ready(struct rt_spi_device *device);
+static rt_err_t  rt_msd_init(rt_device_t dev);
+static rt_err_t  rt_msd_open(rt_device_t dev, rt_uint16_t oflag);
+static rt_err_t  rt_msd_close(rt_device_t dev);
 static rt_size_t rt_msd_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size);
 static rt_size_t rt_msd_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size);
 static rt_size_t rt_msd_sdhc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size);
 static rt_size_t rt_msd_sdhc_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size);
+static rt_err_t rt_msd_control(rt_device_t dev, int cmd, void *args);
 
 static rt_err_t MSD_take_owner(struct rt_spi_device *spi_device)
 {
@@ -461,6 +465,28 @@ static rt_err_t _write_block(struct rt_spi_device *device, const void *buffer, u
     return _wait_ready(device);
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops msd_ops = 
+{
+    rt_msd_init,
+    rt_msd_open,
+    rt_msd_close,
+    rt_msd_read,
+    rt_msd_write,
+    rt_msd_control
+};
+
+const static struct rt_device_ops msd_sdhc_ops = 
+{
+    rt_msd_init,
+    rt_msd_open,
+    rt_msd_close,
+    rt_msd_sdhc_read,
+    rt_msd_sdhc_write,
+    rt_msd_control
+};
+#endif
+
 /* RT-Thread Device Driver Interface */
 static rt_err_t rt_msd_init(rt_device_t dev)
 {
@@ -893,13 +919,21 @@ static rt_err_t rt_msd_init(rt_device_t dev)
 
     if (msd->card_type == MSD_CARD_TYPE_SD_SDHC)
     {
+#ifdef RT_USING_DEVICE_OPS
+        dev->ops   = &msd_sdhc_ops;
+#else
         dev->read  = rt_msd_sdhc_read;
         dev->write = rt_msd_sdhc_write;
+#endif
     }
     else
     {
+#ifdef RT_USING_DEVICE_OPS
+        dev->ops   = &msd_ops;
+#else
         dev->read  = rt_msd_read;
         dev->write = rt_msd_write;
+#endif
     }
 
     /* set CRC */
@@ -1674,12 +1708,16 @@ rt_err_t msd_init(const char *sd_device_name, const char *spi_device_name)
     _msd_device.geometry.sector_count = 0;
     _msd_device.geometry.block_size = 0;
 
+#ifdef RT_USING_DEVICE_OPS
+    _msd_device.parent.ops     = &msd_ops;
+#else
     _msd_device.parent.init    = rt_msd_init;
     _msd_device.parent.open    = rt_msd_open;
     _msd_device.parent.close   = rt_msd_close;
     _msd_device.parent.read    = RT_NULL;
     _msd_device.parent.write   = RT_NULL;
     _msd_device.parent.control = rt_msd_control;
+#endif
 
     /* no private, no callback */
     _msd_device.parent.user_data = RT_NULL;
diff --git a/components/drivers/spi/spi_wifi_rw009.c b/components/drivers/spi/spi_wifi_rw009.c
index 5fb36f33cf..0b92802383 100644
--- a/components/drivers/spi/spi_wifi_rw009.c
+++ b/components/drivers/spi/spi_wifi_rw009.c
@@ -629,6 +629,18 @@ static void spi_wifi_data_thread_entry(void *parameter)
     }
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops rw009_ops =
+{
+    rw009_wifi_init,
+    rw009_wifi_open,
+    rw009_wifi_close,
+    rw009_wifi_read,
+    rw009_wifi_write,
+    rw009_wifi_control
+};
+#endif
+
 rt_err_t rt_hw_wifi_init(const char *spi_device_name, wifi_mode_t mode)
 {
     /* align and struct size check. */
@@ -654,12 +666,16 @@ rt_err_t rt_hw_wifi_init(const char *spi_device_name, wifi_mode_t mode)
         rt_spi_configure(rw009_wifi_device.rt_spi_device, &cfg);
     }
 
+#ifdef RT_USING_DEVICE_OPS
+    rw009_wifi_device.parent.parent.ops        = &rw009_ops;
+#else
     rw009_wifi_device.parent.parent.init       = rw009_wifi_init;
     rw009_wifi_device.parent.parent.open       = rw009_wifi_open;
     rw009_wifi_device.parent.parent.close      = rw009_wifi_close;
     rw009_wifi_device.parent.parent.read       = rw009_wifi_read;
     rw009_wifi_device.parent.parent.write      = rw009_wifi_write;
     rw009_wifi_device.parent.parent.control    = rw009_wifi_control;
+#endif
     rw009_wifi_device.parent.parent.user_data  = RT_NULL;
 
     rw009_wifi_device.parent.eth_rx     = rw009_wifi_rx;
diff --git a/components/drivers/src/pipe.c b/components/drivers/src/pipe.c
index ee9c8ba02a..09264ffbe3 100644
--- a/components/drivers/src/pipe.c
+++ b/components/drivers/src/pipe.c
@@ -416,6 +416,18 @@ rt_err_t  rt_pipe_control(rt_device_t dev, int cmd, void *args)
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops pipe_ops = 
+{
+    RT_NULL,
+    rt_pipe_open,
+    rt_pipe_close,
+    rt_pipe_read,
+    rt_pipe_write,
+    rt_pipe_control,
+};
+#endif
+
 rt_pipe_t *rt_pipe_create(const char *name, int bufsz)
 {
     rt_pipe_t *pipe;
@@ -434,12 +446,16 @@ rt_pipe_t *rt_pipe_create(const char *name, int bufsz)
 
     dev = &(pipe->parent);
     dev->type = RT_Device_Class_Pipe;
+#ifdef RT_USING_DEVICE_OPS
+    dev->ops         = &pipe_ops;
+#else
     dev->init        = RT_NULL;
     dev->open        = rt_pipe_open;
     dev->read        = rt_pipe_read;
     dev->write       = rt_pipe_write;
     dev->close       = rt_pipe_close;
     dev->control     = rt_pipe_control;
+#endif
 
     dev->rx_indicate = RT_NULL;
     dev->tx_complete = RT_NULL;
diff --git a/components/drivers/usb/usbdevice/class/ecm.c b/components/drivers/usb/usbdevice/class/ecm.c
index 0711de3f51..6f19a0099e 100644
--- a/components/drivers/usb/usbdevice/class/ecm.c
+++ b/components/drivers/usb/usbdevice/class/ecm.c
@@ -327,6 +327,19 @@ static rt_err_t rt_ecm_eth_control(rt_device_t dev, int cmd, void *args)
 
     return RT_EOK;
 }
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops ecm_device_ops =
+{
+    rt_ecm_eth_init,
+    rt_ecm_eth_open,
+    rt_ecm_eth_close,
+    rt_ecm_eth_read,
+    rt_ecm_eth_write,
+    rt_ecm_eth_control
+};
+#endif
+
 struct pbuf *rt_ecm_eth_rx(rt_device_t dev)
 {
     struct pbuf* p = RT_NULL;
diff --git a/components/drivers/usb/usbdevice/class/hid.c b/components/drivers/usb/usbdevice/class/hid.c
index 29e581d62b..fe1050e3ef 100644
--- a/components/drivers/usb/usbdevice/class/hid.c
+++ b/components/drivers/usb/usbdevice/class/hid.c
@@ -592,14 +592,33 @@ static void hid_thread_entry(void* parameter)
 		HID_Report_Received(&report);
 	}
 }
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops hid_device_ops =
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _hid_write,
+    RT_NULL,
+};
+#endif
+
 static rt_uint8_t hid_mq_pool[(sizeof(struct hid_report)+sizeof(void*))*8];
 static void rt_usb_hid_init(struct ufunction *func)
 {
     struct hid_s *hiddev;
     hiddev = (struct hid_s *)func->user_data;
     rt_memset(&hiddev->parent, 0, sizeof(hiddev->parent));
+
+#ifdef RT_USING_DEVICE_OPS
+    hiddev->parent.ops   = &hid_device_ops;
+#else
     hiddev->parent.write = _hid_write;
-	hiddev->func = func;
+#endif
+    hiddev->func = func;
+
     rt_device_register(&hiddev->parent, "hidd", RT_DEVICE_FLAG_RDWR);
     rt_mq_init(&hiddev->hid_mq, "hiddmq", hid_mq_pool, sizeof(struct hid_report),
                             sizeof(hid_mq_pool), RT_IPC_FLAG_FIFO);
diff --git a/components/drivers/usb/usbdevice/class/rndis.c b/components/drivers/usb/usbdevice/class/rndis.c
index 7e67b28bef..0f680e9066 100644
--- a/components/drivers/usb/usbdevice/class/rndis.c
+++ b/components/drivers/usb/usbdevice/class/rndis.c
@@ -1180,6 +1180,19 @@ rt_err_t rt_rndis_eth_tx(rt_device_t dev, struct pbuf* p)
 
     return result;
 }
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops rndis_device_ops =
+{
+    rt_rndis_eth_init,
+    rt_rndis_eth_open,
+    rt_rndis_eth_close,
+    rt_rndis_eth_read,
+    rt_rndis_eth_write,
+    rt_rndis_eth_control
+};
+#endif
+
 #endif /* RT_USING_LWIP */
 
 #ifdef  RNDIS_DELAY_LINK_UP
@@ -1307,20 +1320,24 @@ ufunction_t rt_usbd_function_rndis_create(udevice_t device)
     _rndis->host_addr[4]                = 0xEA;//*(const rt_uint8_t *)(0x0FE081F1);
     _rndis->host_addr[5]                = 0x13;//*(const rt_uint8_t *)(0x0FE081F2);
 
+#ifdef RT_USING_DEVICE_OPS
+    _rndis->parent.parent.ops           = &rndis_device_ops;
+#else
     _rndis->parent.parent.init          = rt_rndis_eth_init;
     _rndis->parent.parent.open          = rt_rndis_eth_open;
     _rndis->parent.parent.close         = rt_rndis_eth_close;
     _rndis->parent.parent.read          = rt_rndis_eth_read;
     _rndis->parent.parent.write         = rt_rndis_eth_write;
     _rndis->parent.parent.control       = rt_rndis_eth_control;
+#endif
     _rndis->parent.parent.user_data     = device;
 
     _rndis->parent.eth_rx               = rt_rndis_eth_rx;
     _rndis->parent.eth_tx               = rt_rndis_eth_tx;
 
-	/* register eth device */
+    /* register eth device */
     eth_device_init(&((rt_rndis_eth_t)cdc->user_data)->parent, "u0");
-   
+
 #endif /* RT_USING_LWIP */
 
     return cdc;
diff --git a/components/drivers/usb/usbdevice/class/winusb.c b/components/drivers/usb/usbdevice/class/winusb.c
index 71d946fcd9..9e7c957e7c 100644
--- a/components/drivers/usb/usbdevice/class/winusb.c
+++ b/components/drivers/usb/usbdevice/class/winusb.c
@@ -246,16 +246,34 @@ static rt_err_t  win_usb_control(rt_device_t dev, int cmd, void *args)
     }
     return RT_EOK;
 }
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops winusb_device_ops =
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    win_usb_read,
+    win_usb_write,
+    win_usb_control,
+};
+#endif
+
 static rt_err_t rt_usb_winusb_init(ufunction_t func)
 {
     winusb_device_t winusb_device   = (winusb_device_t)func->user_data;
     winusb_device->parent.type      = RT_Device_Class_Miscellaneous;
+
+#ifdef RT_USING_DEVICE_OPS
+    winusb_device->parent.ops       = &winusb_device_ops;
+#else
     winusb_device->parent.init      = RT_NULL;
     winusb_device->parent.open      = RT_NULL;
     winusb_device->parent.close     = RT_NULL;
     winusb_device->parent.read      = win_usb_read;
     winusb_device->parent.write     = win_usb_write;
     winusb_device->parent.control   = win_usb_control;
+#endif
 
     winusb_device->parent.user_data = func;
 
diff --git a/components/drivers/usb/usbhost/class/adk.c b/components/drivers/usb/usbhost/class/adk.c
index 1481d27ea6..e7eed45127 100644
--- a/components/drivers/usb/usbhost/class/adk.c
+++ b/components/drivers/usb/usbhost/class/adk.c
@@ -37,7 +37,7 @@ static const char* _adk_uri = RT_NULL;
 static const char* _adk_serial = RT_NULL;
 
 rt_err_t rt_usbh_adk_set_string(const char* manufacturer, const char* model,
-    const char* description, const char* _version, const char* uri, 
+    const char* description, const char* _version, const char* uri,
     const char* serial)
 {
     _adk_manufacturer = manufacturer;
@@ -62,31 +62,31 @@ RTM_EXPORT(rt_usbh_adk_set_string);
  * @param intf the interface instance.
  * @duration the idle period of requesting data.
  * @report_id the report id
- * 
+ *
  * @return the error code, RT_EOK on successfully.
 */
 static rt_err_t rt_usbh_adk_get_protocol(struct uintf* intf, rt_uint16_t *protocol)
 {
     struct urequest setup;
-    uinst_t device;    
+    uinst_t device;
     int timeout = 100;
-            
+
         /* parameter check */
     RT_ASSERT(intf != RT_NULL);
     RT_ASSERT(intf->device != RT_NULL);
 
     device = intf->device;
 
-    setup.request_type = USB_REQ_TYPE_DIR_IN | USB_REQ_TYPE_VENDOR | 
+    setup.request_type = USB_REQ_TYPE_DIR_IN | USB_REQ_TYPE_VENDOR |
         USB_REQ_TYPE_DEVICE;
     setup.request = USB_REQ_GET_PROTOCOL;
     setup.index = 0;
     setup.length = 2;
     setup.value = 0;
 
-    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, (void*)protocol, 2, 
+    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, (void*)protocol, 2,
         timeout) == 0) return RT_EOK;
-    else return -RT_FALSE;    
+    else return -RT_FALSE;
 }
 
 /**
@@ -95,32 +95,32 @@ static rt_err_t rt_usbh_adk_get_protocol(struct uintf* intf, rt_uint16_t *protoc
  * @param intf the interface instance.
  * @duration the idle period of requesting data.
  * @report_id the report id
- * 
+ *
  * @return the error code, RT_EOK on successfully.
 */
-static rt_err_t rt_usbh_adk_send_string(struct uintf* intf, rt_uint16_t index, 
+static rt_err_t rt_usbh_adk_send_string(struct uintf* intf, rt_uint16_t index,
     const char* str)
 {
     struct urequest setup;
-    uinst_t device;    
+    uinst_t device;
     int timeout = 100;
-            
+
         /* parameter check */
     RT_ASSERT(intf != RT_NULL);
     RT_ASSERT(intf->device != RT_NULL);
 
     device = intf->device;
 
-    setup.request_type = USB_REQ_TYPE_DIR_OUT | USB_REQ_TYPE_VENDOR | 
+    setup.request_type = USB_REQ_TYPE_DIR_OUT | USB_REQ_TYPE_VENDOR |
         USB_REQ_TYPE_DEVICE;
     setup.request = USB_REQ_SEND_STRING;
     setup.index = index;
     setup.length = rt_strlen(str) + 1;
     setup.value = 0;
 
-    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, (void*)str, 
+    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, (void*)str,
         rt_strlen(str) + 1, timeout) == 0) return RT_EOK;
-    else return -RT_FALSE;   
+    else return -RT_FALSE;
 }
 
 /**
@@ -129,41 +129,41 @@ static rt_err_t rt_usbh_adk_send_string(struct uintf* intf, rt_uint16_t index,
  * @param intf the interface instance.
  * @duration the idle period of requesting data.
  * @report_id the report id
- * 
+ *
  * @return the error code, RT_EOK on successfully.
 */
 static rt_err_t rt_usbh_adk_start(struct uintf* intf)
 {
     struct urequest setup;
-    uinst_t device;    
+    uinst_t device;
     int timeout = 100;
-            
+
         /* parameter check */
     RT_ASSERT(intf != RT_NULL);
     RT_ASSERT(intf->device != RT_NULL);
 
     device = intf->device;
 
-    setup.request_type = USB_REQ_TYPE_DIR_OUT | USB_REQ_TYPE_VENDOR | 
+    setup.request_type = USB_REQ_TYPE_DIR_OUT | USB_REQ_TYPE_VENDOR |
         USB_REQ_TYPE_DEVICE;
     setup.request = USB_REQ_START;
     setup.index = 0;
     setup.length = 0;
     setup.value = 0;
 
-    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, RT_NULL, 0, 
+    if(rt_usb_hcd_control_xfer(device->hcd, device, &setup, RT_NULL, 0,
         timeout) == 0) return RT_EOK;
-    else return -RT_FALSE;   
+    else return -RT_FALSE;
 }
 
 /**
  * This function will read data from usb adk device
  *
  * @param intf the interface instance.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
 */
-static rt_size_t rt_usbh_adk_read(rt_device_t device, rt_off_t pos, void* buffer, 
+static rt_size_t rt_usbh_adk_read(rt_device_t device, rt_off_t pos, void* buffer,
     rt_size_t size)
 {
     uadk_t adk;
@@ -177,9 +177,9 @@ static rt_size_t rt_usbh_adk_read(rt_device_t device, rt_off_t pos, void* buffer
     intf = (struct uintf*)device->user_data;
     adk = (uadk_t)intf->user_data;
 
-    length = rt_usb_hcd_bulk_xfer(intf->device->hcd, adk->pipe_in, 
+    length = rt_usb_hcd_bulk_xfer(intf->device->hcd, adk->pipe_in,
         buffer, size, 300);
-    
+
     return length;
 
 }
@@ -188,33 +188,45 @@ static rt_size_t rt_usbh_adk_read(rt_device_t device, rt_off_t pos, void* buffer
  * This function will write data to usb adk device
  *
  * @param intf the interface instance.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
 */
-static rt_size_t rt_usbh_adk_write (rt_device_t device, rt_off_t pos, const void* buffer, 
+static rt_size_t rt_usbh_adk_write (rt_device_t device, rt_off_t pos, const void* buffer,
     rt_size_t size)
 {
     uadk_t adk;
     rt_size_t length;
     struct uintf* intf;
 
-    RT_ASSERT(buffer != RT_NULL);    
+    RT_ASSERT(buffer != RT_NULL);
 
     intf = (struct uintf*)device->user_data;
     adk = (uadk_t)intf->user_data;
 
-    length = rt_usb_hcd_bulk_xfer(intf->device->hcd, adk->pipe_out, 
+    length = rt_usb_hcd_bulk_xfer(intf->device->hcd, adk->pipe_out,
         (void*)buffer, size, 300);
-    
+
     return length;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops adk_device_ops =
+{
+    RT_NULL;
+    RT_NULL;
+    RT_NULL;
+    rt_usbh_adk_read;
+    rt_usbh_adk_write;
+    RT_NULL;
+};
+#endif
+
 /**
  * This function will run adk class driver when usb device is detected and identified
  *  as a adk class device, it will continue the enumulate process.
  *
  * @param arg the argument.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
  */
 static rt_err_t rt_usbh_adk_enable(void* arg)
@@ -224,8 +236,8 @@ static rt_err_t rt_usbh_adk_enable(void* arg)
     struct uintf* intf = (struct uintf*)arg;
     udev_desc_t dev_desc;
     rt_uint16_t protocol;
-    rt_err_t ret;    
-    
+    rt_err_t ret;
+
     /* parameter check */
     if(intf == RT_NULL)
     {
@@ -234,72 +246,72 @@ static rt_err_t rt_usbh_adk_enable(void* arg)
     }
 
     RT_DEBUG_LOG(RT_DEBUG_USB, ("rt_usbh_adk_run\n"));
-        
+
     dev_desc = &intf->device->dev_desc;
-    if(dev_desc->idVendor == USB_ACCESSORY_VENDOR_ID && 
-        (dev_desc->idProduct == USB_ACCESSORY_PRODUCT_ID || 
+    if(dev_desc->idVendor == USB_ACCESSORY_VENDOR_ID &&
+        (dev_desc->idProduct == USB_ACCESSORY_PRODUCT_ID ||
         dev_desc->idProduct == USB_ACCESSORY_ADB_PRODUCT_ID))
     {
         if(intf->intf_desc->bInterfaceSubClass != 0xFF) return -RT_ERROR;
-    
-        RT_DEBUG_LOG(RT_DEBUG_USB, ("found android accessory device\n"));        
+
+        RT_DEBUG_LOG(RT_DEBUG_USB, ("found android accessory device\n"));
     }
     else
     {
-        RT_DEBUG_LOG(RT_DEBUG_USB, ("switch device\n"));        
-        
+        RT_DEBUG_LOG(RT_DEBUG_USB, ("switch device\n"));
+
         if((ret = rt_usbh_adk_get_protocol(intf, &protocol)) != RT_EOK)
         {
             rt_kprintf("rt_usbh_adk_get_protocol failed\n");
             return ret;
         }
 
-        if(protocol != 1) 
+        if(protocol != 1)
         {
             rt_kprintf("read protocol failed\n");
             return -RT_ERROR;
-        }       
+        }
 
-        rt_usbh_adk_send_string(intf, 
+        rt_usbh_adk_send_string(intf,
             ACCESSORY_STRING_MANUFACTURER, _adk_manufacturer);
-        rt_usbh_adk_send_string(intf, 
+        rt_usbh_adk_send_string(intf,
             ACCESSORY_STRING_MODEL, _adk_model);
-        rt_usbh_adk_send_string(intf, 
+        rt_usbh_adk_send_string(intf,
             ACCESSORY_STRING_DESCRIPTION, _adk_description);
-        rt_usbh_adk_send_string(intf, 
+        rt_usbh_adk_send_string(intf,
             ACCESSORY_STRING_VERSION, _adk_version);
-        rt_usbh_adk_send_string(intf, 
-            ACCESSORY_STRING_URI, _adk_uri);        
-        rt_usbh_adk_send_string(intf, 
-            ACCESSORY_STRING_SERIAL, _adk_serial);            
+        rt_usbh_adk_send_string(intf,
+            ACCESSORY_STRING_URI, _adk_uri);
+        rt_usbh_adk_send_string(intf,
+            ACCESSORY_STRING_SERIAL, _adk_serial);
 
         RT_DEBUG_LOG(RT_DEBUG_USB, ("manufacturer %s\n", _adk_manufacturer));
         RT_DEBUG_LOG(RT_DEBUG_USB, ("model %s\n", _adk_model));
         RT_DEBUG_LOG(RT_DEBUG_USB, ("description %s\n", _adk_description));
         RT_DEBUG_LOG(RT_DEBUG_USB, ("version %s\n", _adk_version));
-        RT_DEBUG_LOG(RT_DEBUG_USB, ("uri %s\n", _adk_uri));       
-        RT_DEBUG_LOG(RT_DEBUG_USB, ("serial %s\n", _adk_serial));               
-        
+        RT_DEBUG_LOG(RT_DEBUG_USB, ("uri %s\n", _adk_uri));
+        RT_DEBUG_LOG(RT_DEBUG_USB, ("serial %s\n", _adk_serial));
+
         if((ret = rt_usbh_adk_start(intf)) != RT_EOK)
         {
             rt_kprintf("rt_usbh_adk_start failed\n");
             return ret;
-        }        
+        }
 
         return RT_EOK;
     }
-    
+
     adk = rt_malloc(sizeof(struct uadkinst));
     RT_ASSERT(adk != RT_NULL);
 
     /* initilize the data structure */
-    rt_memset(adk, 0, sizeof(struct uadkinst));    
+    rt_memset(adk, 0, sizeof(struct uadkinst));
     intf->user_data = (void*)adk;
 
     for(i=0; i<intf->intf_desc->bNumEndpoints; i++)
-    {        
+    {
         uep_desc_t ep_desc;
-        
+
         /* get endpoint descriptor from interface descriptor */
         rt_usbh_get_endpoint_descriptor(intf->intf_desc, i, &ep_desc);
         if(ep_desc == RT_NULL)
@@ -307,24 +319,24 @@ static rt_err_t rt_usbh_adk_enable(void* arg)
             rt_kprintf("rt_usb_get_endpoint_descriptor error\n");
             return -RT_ERROR;
         }
-        
-        /* the endpoint type of adk class should be BULK */    
+
+        /* the endpoint type of adk class should be BULK */
         if((ep_desc->bmAttributes & USB_EP_ATTR_TYPE_MASK) != USB_EP_ATTR_BULK)
             continue;
-        
+
         /* allocate pipes according to the endpoint type */
         if(ep_desc->bEndpointAddress & USB_DIR_IN)
         {
             /* allocate an in pipe for the adk instance */
-            ret = rt_usb_hcd_alloc_pipe(intf->device->hcd, &adk->pipe_in, 
+            ret = rt_usb_hcd_alloc_pipe(intf->device->hcd, &adk->pipe_in,
                 intf, ep_desc, RT_NULL);
             if(ret != RT_EOK) return ret;
         }
         else
-        {        
+        {
             /* allocate an output pipe for the adk instance */
-            ret = rt_usb_hcd_alloc_pipe(intf->device->hcd, &adk->pipe_out, 
-                intf, ep_desc, RT_NULL);            
+            ret = rt_usb_hcd_alloc_pipe(intf->device->hcd, &adk->pipe_out,
+                intf, ep_desc, RT_NULL);
             if(ret != RT_EOK) return ret;
         }
     }
@@ -334,33 +346,37 @@ static rt_err_t rt_usbh_adk_enable(void* arg)
     {
         rt_kprintf("pipe error, unsupported device\n");
         return -RT_ERROR;
-    }    
+    }
 
     /* set configuration */
     ret = rt_usbh_set_configure(intf->device, 1);
     if(ret != RT_EOK) return ret;
 
     /* register adk device */
-    adk->device.type  = RT_Device_Class_Char;                         
-    adk->device.init = RT_NULL;         
-    adk->device.open = RT_NULL;         
-    adk->device.close = RT_NULL;                 
-    adk->device.read = rt_usbh_adk_read;
-    adk->device.write = rt_usbh_adk_write;
+    adk->device.type    = RT_Device_Class_Char;
+#ifdef RT_USING_DEVICE_OPS
+    adk->device.ops     = &adk_device_ops;
+#else
+    adk->device.init    = RT_NULL;
+    adk->device.open    = RT_NULL;
+    adk->device.close   = RT_NULL;
+    adk->device.read    = rt_usbh_adk_read;
+    adk->device.write   = rt_usbh_adk_write;
     adk->device.control = RT_NULL;
+#endif
     adk->device.user_data = (void*)intf;
 
     rt_device_register(&adk->device, "adkdev", RT_DEVICE_FLAG_RDWR);
-    
+
     return RT_EOK;
 }
 
 /**
- * This function will be invoked when usb device plug out is detected and it would clean 
+ * This function will be invoked when usb device plug out is detected and it would clean
  * and release all hub class related resources.
  *
  * @param arg the argument.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
  */
 static rt_err_t rt_usbh_adk_disable(void* arg)
@@ -373,12 +389,12 @@ static rt_err_t rt_usbh_adk_disable(void* arg)
     RT_DEBUG_LOG(RT_DEBUG_USB, ("rt_usbh_adk_stop\n"));
 
     adk = (uadk_t)intf->user_data;
-    if(adk == RT_NULL) 
+    if(adk == RT_NULL)
     {
-        rt_free(intf);    
+        rt_free(intf);
         return RT_EOK;
     }
-    
+
     if(adk->pipe_in != RT_NULL)
         rt_usb_hcd_free_pipe(intf->device->hcd, adk->pipe_in);
 
@@ -389,11 +405,11 @@ static rt_err_t rt_usbh_adk_disable(void* arg)
     rt_device_unregister(&adk->device);
 
     /* free adk instance */
-    if(adk != RT_NULL) 
+    if(adk != RT_NULL)
     {
         rt_free(adk);
     }
-    
+
     /* free interface instance */
     rt_free(intf);
 
@@ -403,13 +419,13 @@ static rt_err_t rt_usbh_adk_disable(void* arg)
 /**
  * This function will register adk class driver to the usb class driver manager.
  * and it should be invoked in the usb system initialization.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
  */
 ucd_t rt_usbh_class_driver_adk(void)
 {
     adk_driver.class_code = USB_CLASS_ADK;
-    
+
     adk_driver.enable = rt_usbh_adk_enable;
     adk_driver.disable = rt_usbh_adk_disable;
 
diff --git a/components/drivers/usb/usbhost/class/udisk.c b/components/drivers/usb/usbhost/class/udisk.c
index f8f47890f4..cdd2551c96 100644
--- a/components/drivers/usb/usbhost/class/udisk.c
+++ b/components/drivers/usb/usbhost/class/udisk.c
@@ -31,7 +31,7 @@ static int udisk_get_id(void)
         if((_udisk_idset & (1 << i)) != 0) continue;
         else break;
     }
-    
+
     /* it should not happen */
     if(i == UDISK_MAX_COUNT) RT_ASSERT(0);
 
@@ -43,14 +43,14 @@ static void udisk_free_id(int id)
 {
     RT_ASSERT(id < UDISK_MAX_COUNT)
 
-    _udisk_idset &= ~(1 << id); 
+    _udisk_idset &= ~(1 << id);
 }
 
 /**
  * This function will initialize the udisk device
  *
  * @param dev the pointer of device driver structure
- * 
+ *
  * @return RT_EOK
  */
 static rt_err_t rt_udisk_init(rt_device_t dev)
@@ -68,7 +68,7 @@ static rt_err_t rt_udisk_init(rt_device_t dev)
  *
  * @return the actually read size on successful, otherwise negative returned.
  */
-static rt_size_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void* buffer, 
+static rt_size_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void* buffer,
     rt_size_t size)
 {
     rt_err_t ret;
@@ -81,18 +81,18 @@ static rt_size_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void* buffer,
     RT_ASSERT(buffer != RT_NULL);
 
     if(size > 4096) timeout = 800;
-    
+
     data = (struct ustor_data*)dev->user_data;
     intf = data->intf;
 
     ret = rt_usbh_storage_read10(intf, (rt_uint8_t*)buffer, pos, size, timeout);
-	
+
     if (ret != RT_EOK)
     {
         rt_kprintf("usb mass_storage read failed\n");
         return 0;
     }
-    
+
     return size;
 }
 
@@ -106,7 +106,7 @@ static rt_size_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void* buffer,
  *
  * @return the actually written size on successful, otherwise negative returned.
  */
-static rt_size_t rt_udisk_write (rt_device_t dev, rt_off_t pos, const void* buffer, 
+static rt_size_t rt_udisk_write (rt_device_t dev, rt_off_t pos, const void* buffer,
     rt_size_t size)
 {
     rt_err_t ret;
@@ -129,7 +129,7 @@ static rt_size_t rt_udisk_write (rt_device_t dev, rt_off_t pos, const void* buff
         rt_kprintf("usb mass_storage write %d sector failed\n", size);
         return 0;
     }
-    
+
     return size;
 }
 
@@ -138,9 +138,9 @@ static rt_size_t rt_udisk_write (rt_device_t dev, rt_off_t pos, const void* buff
  *
  * @param intf the interface instance.
  * @param buffer the data buffer to save inquiry data
- * 
+ *
  * @return the error code, RT_EOK on successfully.
- */    
+ */
 static rt_err_t rt_udisk_control(rt_device_t dev, int cmd, void *args)
 {
     ustor_t stor;
@@ -164,14 +164,26 @@ static rt_err_t rt_udisk_control(rt_device_t dev, int cmd, void *args)
         geometry->sector_count = stor->capicity[0];
     }
 
-    return RT_EOK;    
+    return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops udisk_device_ops =
+{
+    rt_udisk_init,
+    RT_NULL,
+    RT_NULL,
+    rt_udisk_read,
+    rt_udisk_write,
+    rt_udisk_control
+};
+#endif
+
 /**
  * This function will run udisk driver when usb disk is detected.
  *
  * @param intf the usb interface instance.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
  */
 rt_err_t rt_udisk_run(struct uhintf* intf)
@@ -179,10 +191,10 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
     int i = 0;
     rt_err_t ret;
     char dname[4];
-    char sname[8];    
+    char sname[8];
     rt_uint8_t max_lun, *sector, sense[18], inquiry[36];
-    struct dfs_partition part[MAX_PARTITION_COUNT];    
-    ustor_t stor;    
+    struct dfs_partition part[MAX_PARTITION_COUNT];
+    ustor_t stor;
 
     /* check parameter */
     RT_ASSERT(intf != RT_NULL);
@@ -193,40 +205,40 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
 //        rt_usbh_clear_feature(intf->device, 0, USB_FEATURE_ENDPOINT_HALT);
     /* reset mass storage class device */
     ret = rt_usbh_storage_reset(intf);
-    if(ret != RT_EOK) return ret;    
+    if(ret != RT_EOK) return ret;
 
     stor = (ustor_t)intf->user_data;
 
-    /* get max logic unit number */    
+    /* get max logic unit number */
     ret = rt_usbh_storage_get_max_lun(intf, &max_lun);
-    if(ret != RT_EOK)    
+    if(ret != RT_EOK)
         rt_usbh_clear_feature(intf->device, 0, USB_FEATURE_ENDPOINT_HALT);
 
     /* reset pipe in endpoint */
     if(stor->pipe_in->status == UPIPE_STATUS_STALL)
     {
-        ret = rt_usbh_clear_feature(intf->device, 
+        ret = rt_usbh_clear_feature(intf->device,
         stor->pipe_in->ep.bEndpointAddress, USB_FEATURE_ENDPOINT_HALT);
-        if(ret != RT_EOK) return ret; 
+        if(ret != RT_EOK) return ret;
     }
-       
+
 
     /* reset pipe out endpoint */
     if(stor->pipe_out->status == UPIPE_STATUS_STALL)
     {
-        ret = rt_usbh_clear_feature(intf->device, 
+        ret = rt_usbh_clear_feature(intf->device,
         stor->pipe_out->ep.bEndpointAddress, USB_FEATURE_ENDPOINT_HALT);
-        if(ret != RT_EOK) return ret; 
+        if(ret != RT_EOK) return ret;
     }
 
     while((ret = rt_usbh_storage_inquiry(intf, inquiry)) != RT_EOK)
-    {    
+    {
         if(ret == -RT_EIO) return ret;
 
-        rt_thread_delay(5);        
+        rt_thread_delay(5);
         if(i++ < 10) continue;
         rt_kprintf("rt_usbh_storage_inquiry error\n");
-        return -RT_ERROR;    
+        return -RT_ERROR;
     }
 
     i = 0;
@@ -235,26 +247,26 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
     while((ret = rt_usbh_storage_test_unit_ready(intf)) != RT_EOK)
     {
         if(ret == -RT_EIO) return ret;
-        
+
         ret = rt_usbh_storage_request_sense(intf, sense);
         if(ret == -RT_EIO) return ret;
-        
-        rt_thread_delay(10);        
+
+        rt_thread_delay(10);
         if(i++ < 10) continue;
 
         rt_kprintf("rt_usbh_storage_test_unit_ready error\n");
-        return -RT_ERROR;    
+        return -RT_ERROR;
     }
 
     i = 0;
     rt_memset(stor->capicity, 0, sizeof(stor->capicity));
 
     /* get storage capacity */
-    while((ret = rt_usbh_storage_get_capacity(intf, 
+    while((ret = rt_usbh_storage_get_capacity(intf,
         (rt_uint8_t*)stor->capicity)) != RT_EOK)
-    {        
-        if(ret == -RT_EIO) return ret;    
-        
+    {
+        if(ret == -RT_EIO) return ret;
+
         rt_thread_delay(50);
         if(i++ < 10) continue;
 
@@ -262,16 +274,16 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
         stor->capicity[1] = 0x200;
 
         rt_kprintf("rt_usbh_storage_get_capacity error\n");
-        break;    
+        break;
     }
 
     stor->capicity[0] = uswap_32(stor->capicity[0]);
     stor->capicity[1] = uswap_32(stor->capicity[1]);
     stor->capicity[0] += 1;
-    
-    RT_DEBUG_LOG(RT_DEBUG_USB, ("capicity %d, block size %d\n", 
+
+    RT_DEBUG_LOG(RT_DEBUG_USB, ("capicity %d, block size %d\n",
         stor->capicity[0], stor->capicity[1]));
-    
+
     /* get the first sector to read partition table */
     sector = (rt_uint8_t*) rt_malloc (SECTOR_SIZE);
     if (sector == RT_NULL)
@@ -283,42 +295,46 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
     rt_memset(sector, 0, SECTOR_SIZE);
 
     RT_DEBUG_LOG(RT_DEBUG_USB, ("read partition table\n"));
-    
+
     /* get the partition table */
     ret = rt_usbh_storage_read10(intf, sector, 0, 1, 500);
     if(ret != RT_EOK)
     {
         rt_kprintf("read parition table error\n");
 
-        rt_free(sector);        
-        return -RT_ERROR;    
+        rt_free(sector);
+        return -RT_ERROR;
     }
 
     RT_DEBUG_LOG(RT_DEBUG_USB, ("finished reading partition\n"));
-    
+
     for(i=0; i<MAX_PARTITION_COUNT; i++)
-    {        
+    {
         /* get the first partition */
         ret = dfs_filesystem_get_partition(&part[i], sector, i);
         if (ret == RT_EOK)
-        {                
-            struct ustor_data* data = rt_malloc(sizeof(struct ustor_data));    
+        {
+            struct ustor_data* data = rt_malloc(sizeof(struct ustor_data));
             rt_memset(data, 0, sizeof(struct ustor_data));
-            data->intf = intf;            
+            data->intf = intf;
             data->udisk_id = udisk_get_id();
             rt_snprintf(dname, 6, "ud%d-%d", data->udisk_id, i);
             rt_snprintf(sname, 8, "sem_ud%d",  i);
             data->part.lock = rt_sem_create(sname, 1, RT_IPC_FLAG_FIFO);
 
             /* register sdcard device */
-            stor->dev[i].type  = RT_Device_Class_Block;
-            stor->dev[i].init = rt_udisk_init;            
-            stor->dev[i].read = rt_udisk_read;
-            stor->dev[i].write = rt_udisk_write;
+            stor->dev[i].type    = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+            stor->dev[i].ops     = &udisk_device_ops;
+#else
+            stor->dev[i].init    = rt_udisk_init;
+            stor->dev[i].read    = rt_udisk_read;
+            stor->dev[i].write   = rt_udisk_write;
             stor->dev[i].control = rt_udisk_control;
+#endif
             stor->dev[i].user_data = (void*)data;
 
-            rt_device_register(&stor->dev[i], dname, RT_DEVICE_FLAG_RDWR | 
+            rt_device_register(&stor->dev[i], dname, RT_DEVICE_FLAG_RDWR |
                 RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
 
             stor->dev_cnt++;
@@ -330,16 +346,16 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
             else
             {
                 RT_DEBUG_LOG(RT_DEBUG_USB, ("udisk part %d mount failed\n", i));
-            }    
+            }
         }
         else
         {
             if(i == 0)
-            {                
-                struct ustor_data* data = rt_malloc(sizeof(struct ustor_data));                
-                rt_memset(data, 0, sizeof(struct ustor_data));                
+            {
+                struct ustor_data* data = rt_malloc(sizeof(struct ustor_data));
+                rt_memset(data, 0, sizeof(struct ustor_data));
                 data->udisk_id = udisk_get_id();
-                
+
                 /* there is no partition table */
                 data->part.offset = 0;
                 data->part.size   = 0;
@@ -349,23 +365,27 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
                 rt_snprintf(dname, 7, "udisk%d", data->udisk_id);
 
                 /* register sdcard device */
-                stor->dev[0].type  = RT_Device_Class_Block;                         
-                stor->dev[0].init = rt_udisk_init;            
-                stor->dev[0].read = rt_udisk_read;
-                stor->dev[0].write = rt_udisk_write;
+                stor->dev[0].type    = RT_Device_Class_Block;
+#ifdef RT_USING_DEVICE_OPS
+                stor->dev[i].ops     = &udisk_device_ops;
+#else
+                stor->dev[0].init    = rt_udisk_init;
+                stor->dev[0].read    = rt_udisk_read;
+                stor->dev[0].write   = rt_udisk_write;
                 stor->dev[0].control = rt_udisk_control;
+#endif
                 stor->dev[0].user_data = (void*)data;
 
                 rt_device_register(&stor->dev[0], dname,
-                    RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE 
+                    RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE
                     | RT_DEVICE_FLAG_STANDALONE);
 
                 stor->dev_cnt++;
-                if (dfs_mount(stor->dev[0].parent.name, UDISK_MOUNTPOINT, 
+                if (dfs_mount(stor->dev[0].parent.name, UDISK_MOUNTPOINT,
                     "elm", 0, 0) == 0)
-                {            
+                {
                     rt_kprintf("Mount FAT on Udisk successful.\n");
-                }                
+                }
                 else
                 {
                     rt_kprintf("Mount FAT on Udisk failed.\n");
@@ -382,31 +402,31 @@ rt_err_t rt_udisk_run(struct uhintf* intf)
 }
 
 /**
- * This function will be invoked when usb disk plug out is detected and it would clean 
+ * This function will be invoked when usb disk plug out is detected and it would clean
  * and release all udisk related resources.
  *
  * @param intf the usb interface instance.
- * 
+ *
  * @return the error code, RT_EOK on successfully.
  */
 rt_err_t rt_udisk_stop(struct uhintf* intf)
 {
     int i;
-    ustor_t stor;    
+    ustor_t stor;
     struct ustor_data* data;
 
     /* check parameter */
     RT_ASSERT(intf != RT_NULL);
     RT_ASSERT(intf->device != RT_NULL);
 
-    stor = (ustor_t)intf->user_data;    
+    stor = (ustor_t)intf->user_data;
     RT_ASSERT(stor != RT_NULL);
 
     for(i=0; i<stor->dev_cnt; i++)
     {
         rt_device_t dev = &stor->dev[i];
         data = (struct ustor_data*)dev->user_data;
-        
+
         /* unmount filesystem */
         dfs_unmount(UDISK_MOUNTPOINT);
 
diff --git a/components/drivers/watchdog/watchdog.c b/components/drivers/watchdog/watchdog.c
index af2dcace78..e5453f8e43 100644
--- a/components/drivers/watchdog/watchdog.c
+++ b/components/drivers/watchdog/watchdog.c
@@ -78,6 +78,18 @@ static rt_err_t rt_watchdog_control(struct rt_device *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
  */
@@ -95,12 +107,16 @@ rt_err_t rt_hw_watchdog_register(struct rt_watchdog_device *wtd,
     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 */
diff --git a/components/libc/compilers/newlib/libc.c b/components/libc/compilers/newlib/libc.c
index 6d6a7d734e..0b7350c30e 100644
--- a/components/libc/compilers/newlib/libc.c
+++ b/components/libc/compilers/newlib/libc.c
@@ -35,6 +35,8 @@
 #include <pthread.h>
 #endif
 
+int	_EXFUN(putenv,(char *__string));
+
 int libc_system_init(void)
 {
 #if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS)
diff --git a/components/libc/compilers/newlib/stdio.c b/components/libc/compilers/newlib/stdio.c
index 394705bf15..9f30106b72 100644
--- a/components/libc/compilers/newlib/stdio.c
+++ b/components/libc/compilers/newlib/stdio.c
@@ -31,6 +31,8 @@
 
 #define STDIO_DEVICE_NAME_MAX   32
 
+int	_EXFUN(fileno, (FILE *));
+
 static FILE* std_console = NULL;
 
 int libc_stdio_set_console(const char* device_name, int mode)
diff --git a/components/utilities/logtrace/log_file.c b/components/utilities/logtrace/log_file.c
index 4e4e158969..42d1f6e7a9 100644
--- a/components/utilities/logtrace/log_file.c
+++ b/components/utilities/logtrace/log_file.c
@@ -112,6 +112,18 @@ static rt_err_t fdevice_control(rt_device_t dev, int cmd, void *arg)
     return RT_EOK;
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops log_trace_ops = 
+{
+    RT_NULL,
+    fdevice_open,
+    fdevice_close,
+    RT_NULL,
+    fdevice_write,
+    fdevice_control
+};
+#endif
+
 void log_trace_file_init(const char *filename)
 {
     rt_device_t device;
@@ -123,11 +135,15 @@ void log_trace_file_init(const char *filename)
 
         _file_device.parent.type  = RT_Device_Class_Char;
 
+#ifdef RT_USING_DEVICE_OPS
+        _file_device.parent.ops     = &log_trace_ops;
+#else
         _file_device.parent.init    = RT_NULL;
         _file_device.parent.open    = fdevice_open;
         _file_device.parent.close   = fdevice_close;
         _file_device.parent.write   = fdevice_write;
         _file_device.parent.control = fdevice_control;
+#endif
 
         rt_device_register(&_file_device.parent, "logfile", O_RDWR);
     }
diff --git a/components/utilities/logtrace/log_trace.c b/components/utilities/logtrace/log_trace.c
index 79bcde2075..4ea0ff13fd 100644
--- a/components/utilities/logtrace/log_trace.c
+++ b/components/utilities/logtrace/log_trace.c
@@ -383,17 +383,33 @@ static rt_err_t _log_control(rt_device_t dev, int cmd, void *arg)
     return rt_device_control(_traceout_device, cmd, arg);
 }
 
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops log_device_ops = 
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    _log_write,
+    _log_control
+};
+#endif
+
 int log_trace_init(void)
 {
     rt_memset(&_log_device, 0x00, sizeof(_log_device));
 
     _log_device.type = RT_Device_Class_Char;
+#ifdef RT_USING_DEVICE_OPS
+    _log_device.ops     = &log_device_ops;
+#else
     _log_device.init    = RT_NULL;
     _log_device.open    = RT_NULL;
     _log_device.close   = RT_NULL;
     _log_device.read    = RT_NULL;
     _log_device.write   = _log_write;
     _log_device.control = _log_control;
+#endif
 
     /* no indication and complete callback */
     _log_device.rx_indicate = RT_NULL;