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3feb52a2b8
On some newer Thinkpads we need to set SAR value based on antenna type. This patch provides a sysfs interface that userspace can use to get antenna type and set corresponding SAR value, as is required for FCC certification. Reviewed-by: Mark Pearson <markpearson@lenovo.com> Signed-off-by: Nitin Joshi <njoshi1@lenovo.com> Link: https://lore.kernel.org/r/20210317024636.356175-1-njoshi1@lenovo.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>