[PATCH 1/3] ACPI: introduce macros for using the ACPI specification version

[al . stone]

From: Al Stone <al.stone@xxxxxxxxxx>

Add the ACPI_SPEC_VERSION() macro to build a proper version number from
a major and minor revision number.  Add also the ACPI_FADT_SPEC_VERSION
that constructs a proper version number from the entries in the current
FADT.

These macros are added in order to simplify retrieving and comparing ACPI
specification version numbers, since this is becoming a more frequent need.
In particular, there are some architectures that require at least a certain
version of the spec, and there are differences in some structure sizes that
have changed with recent versions but can only be tracked by spec version
number.

Signed-off-by: Al Stone <al.stone@xxxxxxxxxx>
Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Reviewed-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>

CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
CC: Len Brown <lenb@xxxxxxxxxx>

---
 include/linux/acpi.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index a4acb55..33ed313 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -48,6 +48,11 @@
 #include <acpi/acpi_io.h>
 #include <asm/acpi.h>
 
+#define ACPI_SPEC_VERSION(major, minor)	((major<<8)|minor)
+#define ACPI_FADT_SPEC_VERSION	\
+	ACPI_SPEC_VERSION(acpi_gbl_FADT.header.revision, \
+			  acpi_gbl_FADT.minor_revision)
+
 static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
 {
 	return adev ? adev->handle : NULL;
-- 
2.1.0

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