Index: uspace/lib/usb/src/ddfiface.c
===================================================================
--- uspace/lib/usb/src/ddfiface.c	(revision 27ed734ca1edb1dbac9f39a53b2fd7ed46b2b7f4)
+++ uspace/lib/usb/src/ddfiface.c	(revision 56bdd9a4306c6d99a59c72a07fe62501b10576c1)
@@ -36,4 +36,5 @@
 #include <devman.h>
 #include <async.h>
+#include <usb_iface.h>
 #include <usb/ddfiface.h>
 #include <usb/hc.h>
@@ -104,19 +105,15 @@
 
 	async_exch_t *exch = async_exchange_begin(parent_sess);
+	if (!exch) {
+		async_hangup(parent_sess);
+		return ENOMEM;
+	}
 
-	sysarg_t addr;
-	int rc = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
-	    IPC_M_USB_GET_MY_ADDRESS, &addr);
+	const int ret = usb_get_my_address(exch, address);
 
 	async_exchange_end(exch);
 	async_hangup(parent_sess);
 
-	if (rc != EOK)
-		return rc;
-
-	if (address != NULL)
-		*address = (usb_address_t) addr;
-
-	return EOK;
+	return ret;
 }
 
Index: uspace/lib/usb/src/hc.c
===================================================================
--- uspace/lib/usb/src/hc.c	(revision 27ed734ca1edb1dbac9f39a53b2fd7ed46b2b7f4)
+++ uspace/lib/usb/src/hc.c	(revision 56bdd9a4306c6d99a59c72a07fe62501b10576c1)
@@ -181,18 +181,20 @@
 	if (!parent_sess)
 		return ENOMEM;
-	
+
 	async_exch_t *exch = async_exchange_begin(parent_sess);
-	
-	sysarg_t address;
-	int rc = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
-	    IPC_M_USB_GET_MY_ADDRESS, &address);
-	
+	if (!exch) {
+		async_hangup(parent_sess);
+		return ENOMEM;
+	}
+	usb_address_t address;
+	const int ret = usb_get_my_address(exch, &address);
+
 	async_exchange_end(exch);
 	async_hangup(parent_sess);
-	
-	if (rc != EOK)
-		return rc;
-	
-	return (usb_address_t) address;
+
+	if (ret != EOK)
+		return ret;
+
+	return address;
 }
 
@@ -231,21 +233,16 @@
 	if (!parent_sess)
 		return ENOMEM;
-	
+
 	async_exch_t *exch = async_exchange_begin(parent_sess);
-	
-	devman_handle_t h;
-	int rc = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
-	    IPC_M_USB_GET_HOST_CONTROLLER_HANDLE, &h);
-	
+	if (!exch) {
+		async_hangup(parent_sess);
+		return ENOMEM;
+	}
+	const int ret = usb_get_hc_handle(exch, hc_handle);
+
 	async_exchange_end(exch);
 	async_hangup(parent_sess);
-	
-	if (rc != EOK)
-		return rc;
-	
-	if (hc_handle != NULL)
-		*hc_handle = h;
-	
-	return EOK;
+
+	return ret;
 }