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Add documentation for two attributes, status and hrv, in Documentation/ABI/testing/sysfs-bus-acpi. Compiled from git logs and the ACPI specification. Signed-off-by: Aishwarya Pant <aishpant@gmail.com> [ rjw: Minor changes ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
96 lines
3.3 KiB
Plaintext
96 lines
3.3 KiB
Plaintext
What: /sys/bus/acpi/devices/.../path
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Date: December 2006
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute indicates the full path of ACPI namespace
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object associated with the device object. For example,
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\_SB_.PCI0.
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This file is not present for device objects representing
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fixed ACPI hardware features (like power and sleep
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buttons).
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What: /sys/bus/acpi/devices/.../modalias
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Date: July 2007
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute indicates the PNP IDs of the device object.
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That is acpi:HHHHHHHH:[CCCCCCC:]. Where each HHHHHHHH or
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CCCCCCCC contains device object's PNPID (_HID or _CID).
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What: /sys/bus/acpi/devices/.../hid
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Date: April 2005
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute indicates the hardware ID (_HID) of the
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device object. For example, PNP0103.
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This file is present for device objects having the _HID
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control method.
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What: /sys/bus/acpi/devices/.../description
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Date: October 2012
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute contains the output of the device object's
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_STR control method, if present.
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What: /sys/bus/acpi/devices/.../adr
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Date: October 2012
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute contains the output of the device object's
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_ADR control method, which is present for ACPI device
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objects representing devices having standard enumeration
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algorithms, such as PCI.
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What: /sys/bus/acpi/devices/.../uid
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Date: October 2012
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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This attribute contains the output of the device object's
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_UID control method, if present.
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What: /sys/bus/acpi/devices/.../eject
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Date: December 2006
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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Writing 1 to this attribute will trigger hot removal of
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this device object. This file exists for every device
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object that has _EJ0 method.
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What: /sys/bus/acpi/devices/.../status
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Date: Jan, 2014
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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(RO) Returns the ACPI device status: enabled, disabled or
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functioning or present, if the method _STA is present.
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The return value is a decimal integer representing the device's
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status bitmap:
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Bit [0] – Set if the device is present.
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Bit [1] – Set if the device is enabled and decoding its
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resources.
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Bit [2] – Set if the device should be shown in the UI.
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Bit [3] – Set if the device is functioning properly (cleared if
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device failed its diagnostics).
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Bit [4] – Set if the battery is present.
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Bits [31:5] – Reserved (must be cleared)
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If bit [0] is clear, then bit 1 must also be clear (a device
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that is not present cannot be enabled).
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Bit 0 can be clear (not present) with bit [3] set (device is
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functional). This case is used to indicate a valid device for
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which no device driver should be loaded.
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More special cases are covered in the ACPI specification.
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What: /sys/bus/acpi/devices/.../hrv
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Date: Apr, 2016
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Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
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Description:
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(RO) Allows users to read the hardware version of non-PCI
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hardware, if the _HRV control method is present. It is mostly
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useful for non-PCI devices because lspci can list the hardware
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version for PCI devices.
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