linux-kernel - Re: [PATCH v6 1/2] platform/x86: thinkpad_acpi: Add support to detect hardware damage detection capability.

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Message-ID: <f359e9e7-ade6-a022-f21e-47a581ab97c7@linux.intel.com>
Date: Mon, 29 Dec 2025 18:49:39 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Nitin Joshi <nitjoshi@...il.com>
cc: Hans de Goede <hansg@...nel.org>, platform-driver-x86@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>, njoshi1@...ovo.com, 
    Mark Pearson <mpearson-lenovo@...ebb.ca>
Subject: Re: [PATCH v6 1/2] platform/x86: thinkpad_acpi: Add support to detect
 hardware damage detection capability.

On Wed, 24 Dec 2025, Nitin Joshi wrote:

> Thinkpads are adding the ability to detect and report hardware damage
> status. Add new sysfs interface to identify whether hardware damage
> is detected or not.
> 
> Initial support is available for the USB-C replaceable connector.
> 
> Reviewed-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Signed-off-by: Nitin Joshi<nitjoshi@...il.com>
> ---
> Changes since v1:
> -Split patch between hwdd_status and hwdd_detail
> -Incorporated review comments
> Changes since v2:
> -Control visibility of the sysfs attribute based upon ucdd_supported
> Changes since v3:
> -Fix documentation build warning
> Changes since v4:
> -Removed extra line
> Changes since v5:
> -Improved code indentation
> ---
>  .../admin-guide/laptops/thinkpad-acpi.rst     |  21 ++++
>  drivers/platform/x86/lenovo/thinkpad_acpi.c   | 105 ++++++++++++++++++
>  2 files changed, 126 insertions(+)
> 
> diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
> index 4ab0fef7d440..2db05f718b11 100644
> --- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
> +++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
> @@ -54,6 +54,7 @@ detailed description):
>  	- Setting keyboard language
>  	- WWAN Antenna type
>  	- Auxmac
> +	- Hardware damage detection capability
>  
>  A compatibility table by model and feature is maintained on the web
>  site, http://ibm-acpi.sf.net/. I appreciate any success or failure
> @@ -1576,6 +1577,26 @@ percentage level, above which charging will stop.
>  The exact semantics of the attributes may be found in
>  Documentation/ABI/testing/sysfs-class-power.
>  
> +Hardware damage detection capability
> +------------------------------------
> +
> +sysfs attributes: hwdd_status
> +
> +Thinkpads are adding the ability to detect and report hardware damage.
> +Add new sysfs interface to identify the damaged device status.
> +Initial support is available for the USB-C replaceable connector.
> +
> +The command to check device damaged status is::
> +
> +        cat /sys/devices/platform/thinkpad_acpi/hwdd_status
> +
> +This value displays status of device damaged
> +- 0 = Not Damaged
> +- 1 = Damaged

This seems to result in not the best formatting for htmldocs:

"This value displays status of device damaged - 0 = Not Damaged - 1 = Damaged"

-- 
 i.