Re: [PATCH 0/2] platform/x86: lenovo-wmi-capdata: Add debugfs file for dumping capdata

["Derek J. Clark" <derekjohn.clark@gmail.com>]

On February 10, 2026 3:41:31 PM PST, Kurt Borja <kuurtb@gmail.com> wrote:
>On Tue Feb 10, 2026 at 2:19 PM -05, Rong Zhang wrote:
>> The Lenovo GameZone/Other interfaces have some delicate divergences
>> among different devices. When making a bug report or adding support for
>> new devices/interfaces, capdata is the most important information to
>> cross-check with.
>>
>> Add a debugfs file (lenovo_wmi/<device_name>/capdata), so that users can
>> dump capdata and include it in their reports.
>>
>> The output is like:
>>
>>   LENOVO_CAPABILITY_DATA_00[0]:
>>     id:             0x00010000 [dev:  0, feat:  1, mode:  0, type:  0]
>>     supported:      0x00000007 [ RWV]
>>     default_value:  0
>>
>>   LENOVO_CAPABILITY_DATA_01[0]:
>>     id:             0x00000000 [dev:  0, feat:  0, mode:  0, type:  0]
>>     supported:      0x00000000 [    ]
>>     default_value:  0
>>     step:           0
>>     min_value:      0
>>     max_value:      0
>>
>>   LENOVO_FAN_TEST_DATA[0]:
>>     id:             1
>>     min_rpm:        2200
>>     max_rpm:        5000
>>
>> A helper function for creating per-devcie debugfs directories is also
>> introduced into lenovo-wmi-helpers in order that we can maintain a tidy
>> directory structure in debugfs.
>>
>> The series is based on platform-drivers-x86/review-ilpo-next since it
>> depends on a commit there. I am OK to wait until the next cycle.
>>
>> Rong Zhang (2):
>>   platform/x86: lenovo-wmi-helpers: Add helper for creating per-device
>>     debugfs dir
>>   platform/x86: lenovo-wmi-capdata: Add debugfs file for dumping capdata
>>
>>  drivers/platform/x86/lenovo/Kconfig       |   1 +
>>  drivers/platform/x86/lenovo/wmi-capdata.c | 121 ++++++++++++++++++++++
>>  drivers/platform/x86/lenovo/wmi-capdata.h |   4 +-
>>  drivers/platform/x86/lenovo/wmi-helpers.c |  34 ++++++
>>  drivers/platform/x86/lenovo/wmi-helpers.h |   2 +
>>  5 files changed, 159 insertions(+), 3 deletions(-)
>>
>>
>> base-commit: 5a5203a45b063a594e89a2aeaf9e4923893a5b4c
>
>Hi Rong,
>
>This is indeed very useful debug information.
>
>Once you and Derek agree on the approach for this series, I'll add my
>Tested-by tag.
>
>One more thing though. Can you please explain the "supported" byte? What
>is `+` and `V` supposed to mean?
>

Kurt,

It's enumerated in the patch:

+       seq_printf(s, "  supported:      0x%08x [%c%c%c%c]\n", cd00->supported,
+                  extra ? '+' : ' ',
+                  get   ? 'R' : ' ',
+                  set   ? 'W' : ' ',
+                  valid ? 'V' : ' ');


From the documentation:
uint32 Capability //7:by project 
bit 2:  0: not support SetFeatureValue(),  1: support SetFeatureValue() 
bit 1:  0: not support GetFeatureValue(),  1: support GetFeatureValue()
bit 0:  0: not support feature,  1: support feature 

I don't see any examples of the "extra" bit in the docs.

Thanks,
Derek