Index: uspace/drv/bus/usb/ehci/ehci_bus.c
===================================================================
--- uspace/drv/bus/usb/ehci/ehci_bus.c	(revision 1b78beae7338d276b82a29e79c6631114579f95b)
+++ uspace/drv/bus/usb/ehci/ehci_bus.c	(revision f82c48222fe87d2474a8989b9da079425289efb6)
@@ -137,4 +137,45 @@
 {
 	ehci_transfer_batch_destroy(ehci_transfer_batch_get(batch));
+}
+
+static int ehci_device_online(device_t *device)
+{
+	int err;
+
+	/* Allow creation of new endpoints and transfers. */
+	usb_log_info("Device(%d): Going online.", device->address);
+	fibril_mutex_lock(&device->guard);
+	device->online = true;
+	fibril_mutex_unlock(&device->guard);
+
+	if ((err = ddf_fun_online(device->fun))) {
+		return err;
+	}
+
+	return EOK;
+}
+
+static int ehci_device_offline(device_t *device)
+{
+	int err;
+
+	/* Tear down all drivers working with the device. */
+	if ((err = ddf_fun_offline(device->fun))) {
+		return err;
+	}
+
+	/* At this point, all drivers are assumed to have already terminated
+	 * in a consistent way. The following code just cleans up hanging
+	 * transfers if there are any. */
+
+	/* Block creation of new endpoints and transfers. */
+	usb_log_info("Device(%d): Going offline.", device->address);
+	fibril_mutex_lock(&device->guard);
+	device->online = false;
+	fibril_mutex_unlock(&device->guard);
+
+	/* FIXME: Abort all transfers to all endpoints. */
+
+	return EOK;
 }
 
@@ -153,4 +194,6 @@
 	.batch_destroy = ehci_destroy_batch,
 	.batch_schedule = ehci_hc_schedule,
+	.device_online = ehci_device_online,
+	.device_offline = ehci_device_offline,
 };