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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>
43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
What: /sys/devices/.../physical_location
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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This directory contains information on physical location of
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the device connection point with respect to the system's
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housing.
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What: /sys/devices/.../physical_location/panel
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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Describes which panel surface of the system’s housing the
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device connection point resides on.
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What: /sys/devices/.../physical_location/vertical_position
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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Describes vertical position of the device connection point on
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the panel surface.
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What: /sys/devices/.../physical_location/horizontal_position
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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Describes horizontal position of the device connection point on
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the panel surface.
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What: /sys/devices/.../physical_location/dock
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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"Yes" if the device connection point resides in a docking
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station or a port replicator. "No" otherwise.
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What: /sys/devices/.../physical_location/lid
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Date: March 2022
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Contact: Won Chung <wonchung@google.com>
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Description:
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"Yes" if the device connection point resides on the lid of
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laptop system. "No" otherwise.
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