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

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Message-ID: <e53819ec-ab6b-a036-245b-c2da26d5d411@linux.intel.com>
Date: Wed, 3 Dec 2025 12:39:29 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Nitin <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] platform/x86: thinkpad_acpi: Add support to detect
 hardware damage detection capability.

On Wed, 3 Dec 2025, Nitin wrote:

> Hi Ilpo,
> 
> Thank you for reviewing the patch.
> 
> On 12/3/25 18:44, Ilpo Järvinen wrote:
> > On Wed, 3 Dec 2025, Nitin Joshi wrote:
> > 
> > > Thinkpads are adding the ability to detect and report hardware damage
> > > status. Add new sysfs interface to identify the impacted component
> > > with status.
> > > 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>
> > > ---
> > >   .../admin-guide/laptops/thinkpad-acpi.rst     |  26 +++
> > >   drivers/platform/x86/lenovo/thinkpad_acpi.c   | 179 ++++++++++++++++++
> > >   2 files changed, 205 insertions(+)
> > > 
> > > diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
> > > b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
> > > index 4ab0fef7d440..4a3220529489 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 +1577,31 @@ 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 impacted component.
> > > +Initial support is available for the USB-C replaceable connector.
> > > +
> > > +The available commands are::
> > > +
> > > +        cat /sys/devices/platform/thinkpad_acpi/hwdd_status
> > > +
> > > +This value displays device type and location of device with damage
> > > status.
> > > +For example:
> > > +if no damage is detected:
> > > +  No damage detected
> > > +if damage detected:
> > > +  Damage detected:
> > > +  Device: TYPE-C
> > > +  Location: Base, Right side, Center port
> > > +
> > > +The property is read-only. If feature is not supported then sysfs
> > > +class is not created.
> > > +
> > >   Multiple Commands, Module Parameters
> > >   ------------------------------------
> > >   diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c
> > > b/drivers/platform/x86/lenovo/thinkpad_acpi.c
> > > index cc19fe520ea9..c3629bed9a8e 100644
> > > --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c
> > > +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c
> > > @@ -11080,6 +11080,180 @@ static const struct attribute_group
> > > auxmac_attr_group = {
> > >   	.attrs = auxmac_attributes,
> > >   };
> > >   +/*************************************************************************
> > > + * HWDD subdriver, for the Lenovo Hardware Damage Detection feature.
> > > + */
> > > +
> > > +#define HWDD_GET_DMG_USBC 0x80000001
> > > +#define HWDD_GET_CAP 0
> > > +#define HWDD_NOT_SUPPORTED BIT(31)
> > > +#define HWDD_SUPPORT_USBC BIT(0)
> > Align values.
> 
> Ack, i will align values like below:
> 
> #define HWDD_GET_CAP 0
> #define HWDD_GET_DMG_USBC 0x80000001
> #define HWDD_SUPPORT_USBC BIT(0)
> #define HWDD_NOT_SUPPORTED BIT(31)

These are not aligned as values starts from different columns. Please 
put a tab char there in between so the values start at the same column (or 
varying number of tabs depending on the length of the name).

There are plenty of good examples in the code, including in this file 
you're modifying.

-- 
 i.