xen pvfb: Pointer z-axis (mouse wheel) support
Add z-axis motion to pointer events. Backward compatible, because there's space for the z-axis in union xenkbd_in_event, and old backends zero it. Derived from http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/57dfe0098000 http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/1edfea26a2a9 http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/c3ff0b26f664Signed-off-by: NPat Campbell <plc@novell.com> Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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