From: Al Stone al.stone@linaro.org
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@linaro.org Reviewed-by: Hanjun Guo hanjun.guo@linaro.org Reviewed-by: Graeme Gregory graeme.gregory@linaro.org
CC: Rafael J. Wysocki rjw@rjwysocki.net CC: Len Brown lenb@kernel.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;