linux-kernel - Re: [PATCH] acpi: device_sysfs: update sysfs documentation

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Date:   Wed, 14 Mar 2018 12:38:19 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Aishwarya Pant <aishpant@...il.com>
Cc:     Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] acpi: device_sysfs: update sysfs documentation

On Tuesday, February 13, 2018 7:54:10 PM CET Aishwarya Pant wrote:
> 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@...il.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 <rjw@...ysocki.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 [0] –  Set if the device is present.
> +		Bit [1] –  Set if the device is enabled and decoding its
> +		resources.
> +		Bit [2] –  Set if the device should be shown in the UI.
> +		Bit [3] –  Set if the device is functioning properly (cleared if
> +		device failed its diagnostics).
> +		Bit [4] –  Set if the battery is present.
> +		Bits [31:5] –  Reserved (must be cleared)
> +
> +		If bit [0] 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 [3] 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 <rjw@...ysocki.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.
> 

Applied, thanks!