From bb74ac23b10820d8722c3e1f4add9ef59e703f63 Mon Sep 17 00:00:00 2001 From: Yasuaki Ishimatsu Date: Fri, 16 Nov 2012 02:56:59 +0100 Subject: ACPI: create _SUN sysfs file _SUN method provides the slot unique-ID in the ACPI namespace. And The value is written in Advanced Configuration and Power Interface Specification as follows: "The _SUN value is required to be unique among the slots ofthe same type. It is also recommended that this number match the slot number printed on the physical slot whenever possible." So if we can know the value, we can identify the physical position of the slot in the system. The patch creates "sun" file in sysfs for identifying physical position of the slot. Signed-off-by: Yasuaki Ishimatsu Reviewed-by: Toshi Kani Signed-off-by: Rafael J. Wysocki --- Documentation/ABI/testing/sysfs-devices-sun | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-devices-sun (limited to 'Documentation') diff --git a/Documentation/ABI/testing/sysfs-devices-sun b/Documentation/ABI/testing/sysfs-devices-sun new file mode 100644 index 000000000000..86be9848a77e --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-sun @@ -0,0 +1,14 @@ +Whatt: /sys/devices/.../sun +Date: October 2012 +Contact: Yasuaki Ishimatsu +Description: + 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. -- cgit v1.2.1