diff --git a/src/device/dcd.h b/src/device/dcd.h
index 143a2de34..487ddb3b6 100644
--- a/src/device/dcd.h
+++ b/src/device/dcd.h
@@ -106,6 +106,12 @@ void dcd_set_config (uint8_t rhport, uint8_t config_num);
 // Wake up host
 void dcd_remote_wakeup(uint8_t rhport);
 
+// disconnect by disabling internal pull-up resistor on D+/D-
+void dcd_disconnect(uint8_t rhport) TU_ATTR_WEAK;
+
+// connect by enabling internal pull-up resistor on D+/D-
+void dcd_connect(uint8_t rhport) TU_ATTR_WEAK;
+
 //--------------------------------------------------------------------+
 // Endpoint API
 //--------------------------------------------------------------------+
diff --git a/src/device/usbd.h b/src/device/usbd.h
index beeec7e1c..817af20e3 100644
--- a/src/device/usbd.h
+++ b/src/device/usbd.h
@@ -65,6 +65,20 @@ static inline bool tud_ready(void)
 // Remote wake up host, only if suspended and enabled by host
 bool tud_remote_wakeup(void);
 
+static inline bool tud_disconnect(void)
+{
+  TU_VERIFY(dcd_disconnect);
+  dcd_disconnect(TUD_OPT_RHPORT);
+  return true;
+}
+
+static inline bool tud_connect(void)
+{
+  TU_VERIFY(dcd_connect);
+  dcd_connect(TUD_OPT_RHPORT);
+  return true;
+}
+
 // Carry out Data and Status stage of control transfer
 // - If len = 0, it is equivalent to sending status only
 // - If len > wLength : it will be truncated
diff --git a/src/portable/microchip/samd/dcd_samd.c b/src/portable/microchip/samd/dcd_samd.c
index 148995520..c3d2985d4 100644
--- a/src/portable/microchip/samd/dcd_samd.c
+++ b/src/portable/microchip/samd/dcd_samd.c
@@ -154,10 +154,23 @@ void dcd_set_config (uint8_t rhport, uint8_t config_num)
 void dcd_remote_wakeup(uint8_t rhport)
 {
   (void) rhport;
-
   USB->DEVICE.CTRLB.bit.UPRSM = 1;
 }
 
+// disconnect by disabling internal pull-up resistor on D+/D-
+void dcd_disconnect(uint8_t rhport)
+{
+  (void) rhport;
+  USB->DEVICE.CTRLB.reg |= USB_DEVICE_CTRLB_DETACH;
+}
+
+// connect by enabling internal pull-up resistor on D+/D-
+void dcd_connect(uint8_t rhport)
+{
+  (void) rhport;
+   USB->DEVICE.CTRLB.reg &= ~USB_DEVICE_CTRLB_DETACH;
+}
+
 /*------------------------------------------------------------------*/
 /* DCD Endpoint port
  *------------------------------------------------------------------*/
diff --git a/src/portable/nordic/nrf5x/dcd_nrf5x.c b/src/portable/nordic/nrf5x/dcd_nrf5x.c
index 2ce288d6c..c0dddef83 100644
--- a/src/portable/nordic/nrf5x/dcd_nrf5x.c
+++ b/src/portable/nordic/nrf5x/dcd_nrf5x.c
@@ -237,6 +237,20 @@ void dcd_remote_wakeup(uint8_t rhport)
   // We may manually raise DCD_EVENT_RESUME event here
 }
 
+// disconnect by disabling internal pull-up resistor on D+/D-
+void dcd_disconnect(uint8_t rhport)
+{
+  (void) rhport;
+  NRF_USBD->USBPULLUP = 0;
+}
+
+// connect by enabling internal pull-up resistor on D+/D-
+void dcd_connect(uint8_t rhport)
+{
+  (void) rhport;
+  NRF_USBD->USBPULLUP = 1;
+}
+
 //--------------------------------------------------------------------+
 // Endpoint API
 //--------------------------------------------------------------------+
diff --git a/src/portable/sony/cxd56/dcd_cxd56.c b/src/portable/sony/cxd56/dcd_cxd56.c
index 638b2f979..320b7237e 100644
--- a/src/portable/sony/cxd56/dcd_cxd56.c
+++ b/src/portable/sony/cxd56/dcd_cxd56.c
@@ -46,22 +46,22 @@ struct usbdcd_driver_s
 static struct usbdcd_driver_s usbdcd_driver;
 static struct usbdev_s *usbdev;
 
-static int dcd_bind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
-static void dcd_unbind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
-static int dcd_setup(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev,
-                     FAR const struct usb_ctrlreq_s *ctrl, FAR uint8_t *dataout, size_t outlen);
-static void dcd_disconnect(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
-static void dcd_suspend(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
-static void dcd_resume(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
+static int  _dcd_bind       (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
+static void _dcd_unbind     (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
+static int  _dcd_setup      (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev,
+                             FAR const struct usb_ctrlreq_s *ctrl, FAR uint8_t *dataout, size_t outlen);
+static void _dcd_disconnect (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
+static void _dcd_suspend    (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
+static void _dcd_resume     (FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev);
 
 static const struct usbdevclass_driverops_s g_driverops =
 {
-  dcd_bind,       /* bind */
-  dcd_unbind,     /* unbind */
-  dcd_setup,      /* setup */
-  dcd_disconnect, /* disconnect */
-  dcd_suspend,    /* suspend */
-  dcd_resume,     /* resume */
+  _dcd_bind,       /* bind */
+  _dcd_unbind,     /* unbind */
+  _dcd_setup,      /* setup */
+  _dcd_disconnect, /* disconnect */
+  _dcd_suspend,    /* suspend */
+  _dcd_resume,     /* resume */
 };
 
 static void usbdcd_ep0incomplete(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
@@ -86,7 +86,7 @@ static void usbdcd_ep0incomplete(FAR struct usbdev_ep_s *ep, FAR struct usbdev_r
   }
 }
 
-static int dcd_bind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
+static int _dcd_bind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
 {
   (void) driver;
 
@@ -111,13 +111,13 @@ static int dcd_bind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s
   return 0;
 }
 
-static void dcd_unbind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
+static void _dcd_unbind(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
 {
   (void) driver;
   (void) dev;
 }
 
-static int dcd_setup(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev,
+static int _dcd_setup(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev,
                      FAR const struct usb_ctrlreq_s *ctrl, FAR uint8_t *dataout, size_t outlen)
 {
   (void) driver;
@@ -130,7 +130,7 @@ static int dcd_setup(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_
   return 0;
 }
 
-static void dcd_disconnect(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
+static void _dcd_disconnect(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
 {
   (void) driver;
 
@@ -138,7 +138,7 @@ static void dcd_disconnect(FAR struct usbdevclass_driver_s *driver, FAR struct u
   DEV_CONNECT(dev);
 }
 
-static void dcd_suspend(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
+static void _dcd_suspend(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
 {
   (void) driver;
   (void) dev;
@@ -146,7 +146,7 @@ static void dcd_suspend(FAR struct usbdevclass_driver_s *driver, FAR struct usbd
   dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true);
 }
 
-static void dcd_resume(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
+static void _dcd_resume(FAR struct usbdevclass_driver_s *driver, FAR struct usbdev_s *dev)
 {
   (void) driver;
   (void) dev;