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 <aishp...@gmail.com> --- Documentation/ABI/testing/sysfs-bus-acpi | 36 ++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-acpi b/Documentation/ABI/testing/sysfs-bus-acpi index 7fa9cbc75344..89feb01d1d0d 100644 --- a/Documentation/ABI/testing/sysfs-bus-acpi +++ b/Documentation/ABI/testing/sysfs-bus-acpi @@ -56,3 +56,39 @@ Description: Writing 1 to this attribute will trigger hot removal of this device object. This file exists for every device object that has _EJ0 method. + +What: /sys/bus/acpi/devices/.../status +Date: Jan, 2014 +Contact: Rafael J. Wysocki <r...@rjwysocki.net> +Description: + (RO) Displays the ACPI device status - enabled, disabled or + functioning or present, if the method _STA is present. + + Return value is an integer containing a device status bitmap: + + Bit  – Set if the device is present. + Bit  – Set if the device is enabled and decoding its + resources. + Bit  – Set if the device should be shown in the UI. + Bit  – Set if the device is functioning properly (cleared if + device failed its diagnostics). + Bit  – Set if the battery is present. + Bits [31:5] – Reserved (must be cleared) + + If bit  is cleared, then bit 1 must also be cleared (a device + that is not present cannot be enabled). + + Bit 0 can be clear (not present) with bit  set (device is + functional). This case is used to indicate a valid device for + which no device driver should be loaded. + + More special cases are covered in the ACPI specification. + +What: /sys/bus/acpi/devices/.../hrv +Date: Apr, 2016 +Contact: Rafael J. Wysocki <r...@rjwysocki.net> +Description: + (RO) Allows users to read the hardware version of non-PCI + hardware, if the _HRV control method is present. It is most + useful for non-PCI devices because lspci can list the hardware + version for PCI devices. -- 2.16.1