Index: uspace/app/vuhid/virthid.h
===================================================================
--- uspace/app/vuhid/virthid.h	(revision 9a884ed2702826b3b497efb5d6981060e0b515a8)
+++ uspace/app/vuhid/virthid.h	(revision f31aed53e89c70ff7c027ecb9828775b3971382a)
@@ -82,4 +82,27 @@
 
 typedef struct {
+	/** Buffer with data from device to the host. */
+	uint8_t *data_in;
+	/** Number of items in @c data_in.
+	 * The total size of @c data_in buffer shall be
+	 * <code>data_in_count * vuhid_interface_t.in_data_size</code>.
+	 */
+	size_t data_in_count;
+
+	/** Current position in the data buffer. */
+	size_t data_in_pos;
+	/** Previous position. */
+	size_t data_in_last_pos;
+
+	/** Delay between transition to "next" input buffer (in ms). */
+	size_t data_in_pos_change_delay;
+
+	/** Message to print when interface becomes alive. */
+	const char *msg_born;
+	/** Message to print when interface dies. */
+	const char *msg_die;
+} vuhid_interface_life_t;
+
+typedef struct {
 	uint8_t length;
 	uint8_t type;
@@ -94,4 +117,8 @@
 void wait_for_interfaces_death(usbvirt_device_t *);
 
+void interface_life_live(vuhid_interface_t *);
+int interface_live_on_data_in(vuhid_interface_t *, void *, size_t, size_t *);
+
+
 #endif
 /**