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Newer Thinkpads have a feature called MAC Address Pass-through. This patch provides a sysfs interface that userspace can use to get this auxiliary mac address. Signed-off-by: Fernando Eckhardt Valle <fevalle@ipt.br> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20230926202144.5906-1-fevalle@ipt.br Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>