Index: uspace/lib/usb/Makefile
===================================================================
--- uspace/lib/usb/Makefile	(revision 9501cced4832feaa69f1ecd479985c509812797d)
+++ uspace/lib/usb/Makefile	(revision 90fb67905fb2165ffde39c28adcb4300e314a450)
@@ -35,4 +35,5 @@
 	src/addrkeep.c \
 	src/debug.c \
+	src/drvpsync.c \
 	src/hcdhubd.c \
 	src/hcdrv.c \
Index: uspace/lib/usb/include/usb/usbdrv.h
===================================================================
--- uspace/lib/usb/include/usb/usbdrv.h	(revision 9501cced4832feaa69f1ecd479985c509812797d)
+++ uspace/lib/usb/include/usb/usbdrv.h	(revision 90fb67905fb2165ffde39c28adcb4300e314a450)
@@ -56,4 +56,9 @@
     void *, size_t, size_t *, usb_handle_t *);
 
+int usb_drv_psync_interrupt_out(int, usb_target_t, void *, size_t);
+int usb_drv_psync_interrupt_in(int, usb_target_t, void *, size_t, size_t *);
+
+
+
 int usb_drv_async_control_write_setup(int, usb_target_t,
     void *, size_t, usb_handle_t *);
@@ -63,4 +68,9 @@
     usb_handle_t *);
 
+int usb_drv_psync_control_write_setup(int, usb_target_t, void *, size_t);
+int usb_drv_psync_control_write_data(int, usb_target_t, void *, size_t);
+int usb_drv_psync_control_write_status(int, usb_target_t);
+
+
 int usb_drv_async_control_read_setup(int, usb_target_t,
     void *, size_t, usb_handle_t *);
@@ -69,4 +79,9 @@
 int usb_drv_async_control_read_status(int, usb_target_t,
     usb_handle_t *);
+
+int usb_drv_psync_control_read_setup(int, usb_target_t, void *, size_t);
+int usb_drv_psync_control_read_data(int, usb_target_t, void *, size_t, size_t *);
+int usb_drv_psync_control_read_status(int, usb_target_t);
+
 
 int usb_drv_async_wait_for(usb_handle_t);
Index: uspace/lib/usb/src/drvpsync.c
===================================================================
--- uspace/lib/usb/src/drvpsync.c	(revision 90fb67905fb2165ffde39c28adcb4300e314a450)
+++ uspace/lib/usb/src/drvpsync.c	(revision 90fb67905fb2165ffde39c28adcb4300e314a450)
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2010 Vojtech Horky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libusb usb
+ * @{
+ */
+/** @file
+ * @brief Implementation of pseudo-synchronous transfers.
+ */
+#include <usb/usbdrv.h>
+#include <usbhc_iface.h>
+#include <errno.h>
+
+int usb_drv_psync_interrupt_out(int phone, usb_target_t target,
+    void *buffer, size_t size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_interrupt_out(phone, target, buffer, size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+int usb_drv_psync_interrupt_in(int phone, usb_target_t target,
+    void *buffer, size_t size, size_t *actual_size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_interrupt_in(phone, target, buffer, size,
+	    actual_size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+
+
+int usb_drv_psync_control_write_setup(int phone, usb_target_t target,
+    void *buffer, size_t size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_write_setup(phone, target, buffer, size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+int usb_drv_psync_control_write_data(int phone, usb_target_t target,
+    void *buffer, size_t size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_write_data(phone, target, buffer, size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+int usb_drv_psync_control_write_status(int phone, usb_target_t target)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_write_status(phone, target, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+
+
+int usb_drv_psync_control_read_setup(int phone, usb_target_t target,
+    void *buffer, size_t size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_read_setup(phone, target, buffer, size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+int usb_drv_psync_control_read_data(int phone, usb_target_t target,
+    void *buffer, size_t size, size_t *actual_size)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_read_data(phone, target, buffer, size,
+	    actual_size, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+int usb_drv_psync_control_read_status(int phone, usb_target_t target)
+{
+	usb_handle_t h;
+	int rc;
+	rc = usb_drv_async_control_read_status(phone, target, &h);
+	if (rc != EOK) {
+		return rc;
+	}
+	return usb_drv_async_wait_for(h);
+}
+
+/**
+ * @}
+ */