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.st...@linaro.org>
---
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;
--
2.4.0
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