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linux/Documentation/ABI/testing/sysfs-devices-physical_location

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driver core: Add sysfs support for physical location of a device When ACPI table includes _PLD fields for a device, create a new directory (physical_location) in sysfs to share _PLD fields. Currently without PLD information, when there are multiple of same devices, it is hard to distinguish which device corresponds to which physical device at which location. For example, when there are two Type C connectors, it is hard to find out which connector corresponds to the Type C port on the left panel versus the Type C port on the right panel. With PLD information provided, we can determine which specific device at which location is doing what. _PLD output includes much more fields, but only generic fields are added and exposed to sysfs, so that non-ACPI devices can also support it in the future. The minimal generic fields needed for locating a device are the following. - panel - vertical_position - horizontal_position - dock - lid Signed-off-by: Won Chung <wonchung@google.com> Link: https://lore.kernel.org/r/20220314195458.271430-1-wonchung@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-14 12:54:58 -07:00
What: /sys/devices/.../physical_location
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
This directory contains information on physical location of
the device connection point with respect to the system's
housing.
What: /sys/devices/.../physical_location/panel
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
Describes which panel surface of the system’s housing the
device connection point resides on.
What: /sys/devices/.../physical_location/vertical_position
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
Describes vertical position of the device connection point on
the panel surface.
What: /sys/devices/.../physical_location/horizontal_position
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
Describes horizontal position of the device connection point on
the panel surface.
What: /sys/devices/.../physical_location/dock
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
"Yes" if the device connection point resides in a docking
station or a port replicator. "No" otherwise.
What: /sys/devices/.../physical_location/lid
Date: March 2022
Contact: Won Chung <wonchung@google.com>
Description:
"Yes" if the device connection point resides on the lid of
laptop system. "No" otherwise.
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