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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>
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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.