diff --git a/components/drivers/include/drivers/pin.h b/components/drivers/include/drivers/pin.h
index 7e1fd4e825..704114cf99 100644
--- a/components/drivers/include/drivers/pin.h
+++ b/components/drivers/include/drivers/pin.h
@@ -59,18 +59,18 @@ struct rt_device_pin_status
 
 struct rt_pin_ops
 {
-    void (*pin_mode) (struct rt_device* device, rt_base_t pin, rt_base_t mode);
-    void (*pin_write)(struct rt_device* device, rt_base_t pin, rt_base_t value);
-    int  (*pin_read) (struct rt_device* device, rt_base_t pin);
+    void (*pin_mode)(struct rt_device *device, rt_base_t pin, rt_base_t mode);
+    void (*pin_write)(struct rt_device *device, rt_base_t pin, rt_base_t value);
+    int (*pin_read)(struct rt_device *device, rt_base_t pin);
 
     /* TODO: add GPIO interrupt */
 };
 
-int rt_device_pin_register(const char* name, const struct rt_pin_ops* ops, void* user_data);
+int rt_device_pin_register(const char *name, const struct rt_pin_ops *ops, void *user_data);
 
 void rt_pin_mode(rt_base_t pin, rt_base_t mode);
 void rt_pin_write(rt_base_t pin, rt_base_t value);
-int  rt_pin_read (rt_base_t pin);
+int  rt_pin_read(rt_base_t pin);
 
 #ifdef __cplusplus
 }
diff --git a/components/drivers/misc/pin.c b/components/drivers/misc/pin.c
index ef244ccdc7..d83c3d2f03 100644
--- a/components/drivers/misc/pin.c
+++ b/components/drivers/misc/pin.c
@@ -29,30 +29,30 @@
 #endif
 
 static struct rt_device_pin _hw_pin;
-static rt_size_t _pin_read   (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+static rt_size_t _pin_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
 {
-    struct rt_device_pin_status* status;
-    struct rt_device_pin* pin = (struct rt_device_pin*)dev;
+    struct rt_device_pin_status *status;
+    struct rt_device_pin *pin = (struct rt_device_pin *)dev;
 
     /* check parameters */
     RT_ASSERT(pin != RT_NULL);
 
-    status = (struct rt_device_pin_status*) buffer;
+    status = (struct rt_device_pin_status *) buffer;
     if (status == RT_NULL || size != sizeof(*status)) return 0;
 
     status->status = pin->ops->pin_read(dev, status->pin);
     return size;
 }
 
-static rt_size_t _pin_write  (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+static rt_size_t _pin_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
 {
-    struct rt_device_pin_status* status;
-    struct rt_device_pin* pin = (struct rt_device_pin*)dev;
+    struct rt_device_pin_status *status;
+    struct rt_device_pin *pin = (struct rt_device_pin *)dev;
 
     /* check parameters */
     RT_ASSERT(pin != RT_NULL);
 
-    status = (struct rt_device_pin_status*) buffer;
+    status = (struct rt_device_pin_status *) buffer;
     if (status == RT_NULL || size != sizeof(*status)) return 0;
 
     pin->ops->pin_write(dev, (rt_base_t)status->pin, (rt_base_t)status->status);
@@ -62,13 +62,13 @@ static rt_size_t _pin_write  (rt_device_t dev, rt_off_t pos, const void *buffer,
 
 static rt_err_t  _pin_control(rt_device_t dev, rt_uint8_t cmd, void *args)
 {
-    struct rt_device_pin_mode* mode;
-    struct rt_device_pin* pin = (struct rt_device_pin*)dev;
+    struct rt_device_pin_mode *mode;
+    struct rt_device_pin *pin = (struct rt_device_pin *)dev;
 
     /* check parameters */
     RT_ASSERT(pin != RT_NULL);
 
-    mode = (struct rt_device_pin_mode*) args;
+    mode = (struct rt_device_pin_mode *) args;
     if (mode == RT_NULL) return -RT_ERROR;
 
     pin->ops->pin_mode(dev, (rt_base_t)mode->pin, (rt_base_t)mode->mode);
@@ -76,24 +76,24 @@ static rt_err_t  _pin_control(rt_device_t dev, rt_uint8_t cmd, void *args)
     return 0;
 }
 
-int rt_device_pin_register(const char* name, const struct rt_pin_ops* ops, void* user_data)
+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;
+    _hw_pin.parent.type         = RT_Device_Class_Miscellaneous;
+    _hw_pin.parent.rx_indicate  = RT_NULL;
+    _hw_pin.parent.tx_complete  = RT_NULL;
 
-	_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;
+    _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;
 
     _hw_pin.ops                 = ops;
-	_hw_pin.parent.user_data	= user_data;
+    _hw_pin.parent.user_data    = user_data;
 
-	/* register a character device */
-	rt_device_register(&_hw_pin.parent, "pin", RT_DEVICE_FLAG_RDWR);
+    /* register a character device */
+    rt_device_register(&_hw_pin.parent, "pin", RT_DEVICE_FLAG_RDWR);
 
     return 0;
 }
@@ -111,7 +111,7 @@ void rt_pin_write(rt_base_t pin, rt_base_t value)
 }
 FINSH_FUNCTION_EXPORT_ALIAS(rt_pin_write, pinWrite, write value to hardware pin);
 
-int  rt_pin_read (rt_base_t pin)
+int  rt_pin_read(rt_base_t pin)
 {
     return _hw_pin.ops->pin_read(&_hw_pin.parent, pin);
 }