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+Date: October 2012
+Contact: Yasuaki Ishimatsu <email@example.com>
+ The file contains a Slot-unique ID which provided by the _SUN
+ method in the ACPI namespace. The value is written in Advanced
+ Configuration and Power Interface Specification as follows:
+ "The _SUN value is required to be unique among the slots of
+ the same type. It is also recommended that this number match
+ the slot number printed on the physical slot whenever possible."
+ So reading the sysfs file, we can identify a physical position
+ of the slot in the system.