ideapad: add ACPI helpers
There are two methods under VPC2004 which is used to access VDAT/VCMD of EC register. Add helpers for read and write these two registers. And add read_method_int for reading the return value from ACPI methods which requires no parameter. Signed-off-by: Ike Panhc <ike.pan@canonical.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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