+/**
+ * usb_gadget_vbus_connect - Notify controller that VBUS is powered
+ * @gadget:The device which now has VBUS power.
+ *
+ * This call is used by a driver for an external transceiver (or GPIO)
+ * that detects a VBUS power session starting. Common responses include
+ * resuming the controller, activating the D+ (or D-) pullup to let the
+ * host detect that a USB device is attached, and starting to draw power
+ * (8mA or possibly more, especially after SET_CONFIGURATION).
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_vbus_connect(struct usb_gadget *gadget)
+{
+ if (!gadget->ops->vbus_session)
+ return -EOPNOTSUPP;
+ return gadget->ops->vbus_session (gadget, 1);
+}
+
+/**
+ * usb_gadget_vbus_draw - constrain controller's VBUS power usage
+ * @gadget:The device whose VBUS usage is being described
+ * @mA:How much current to draw, in milliAmperes. This should be twice
+ * the value listed in the configuration descriptor bMaxPower field.
+ *
+ * This call is used by gadget drivers during SET_CONFIGURATION calls,
+ * reporting how much power the device may consume. For example, this
+ * could affect how quickly batteries are recharged.
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
+{
+ if (!gadget->ops->vbus_draw)
+ return -EOPNOTSUPP;
+ return gadget->ops->vbus_draw (gadget, mA);
+}
+
+/**
+ * usb_gadget_vbus_disconnect - notify controller about VBUS session end
+ * @gadget:the device whose VBUS supply is being described
+ *
+ * This call is used by a driver for an external transceiver (or GPIO)
+ * that detects a VBUS power session ending. Common responses include
+ * reversing everything done in usb_gadget_vbus_connect().
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_vbus_disconnect(struct usb_gadget *gadget)
+{
+ if (!gadget->ops->vbus_session)
+ return -EOPNOTSUPP;
+ return gadget->ops->vbus_session (gadget, 0);
+}
+
+/**
+ * usb_gadget_connect - software-controlled connect to USB host
+ * @gadget:the peripheral being connected
+ *
+ * Enables the D+ (or potentially D-) pullup. The host will start
+ * enumerating this gadget when the pullup is active and a VBUS session
+ * is active (the link is powered). This pullup is always enabled unless
+ * usb_gadget_disconnect() has been used to disable it.
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_connect (struct usb_gadget *gadget)
+{
+ if (!gadget->ops->pullup)
+ return -EOPNOTSUPP;
+ return gadget->ops->pullup (gadget, 1);
+}
+
+/**
+ * usb_gadget_disconnect - software-controlled disconnect from USB host
+ * @gadget:the peripheral being disconnected
+ *
+ * Disables the D+ (or potentially D-) pullup, which the host may see
+ * as a disconnect (when a VBUS session is active). Not all systems
+ * support software pullup controls.
+ *
+ * This routine may be used during the gadget driver bind() call to prevent
+ * the peripheral from ever being visible to the USB host, unless later
+ * usb_gadget_connect() is called. For example, user mode components may
+ * need to be activated before the system can talk to hosts.
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_disconnect (struct usb_gadget *gadget)
+{
+ if (!gadget->ops->pullup)
+ return -EOPNOTSUPP;
+ return gadget->ops->pullup (gadget, 0);
+}
+
+