linux-kernel - [PATCH 0/6] platform/x86: lenovo-wmi-{capdata,other}: Add HWMON for fan speed

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Message-ID: <20251019210450.88830-1-i@rong.moe>
Date: Mon, 20 Oct 2025 05:04:43 +0800
From: Rong Zhang <i@...g.moe>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>,
	"Derek J. Clark" <derekjohn.clark@...il.com>,
	Armin Wolf <W_Armin@....de>,
	Hans de Goede <hansg@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Rong Zhang <i@...g.moe>,
	Guenter Roeck <linux@...ck-us.net>,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org
Subject: [PATCH 0/6] platform/x86: lenovo-wmi-{capdata,other}: Add HWMON for fan speed

Lenovo WMI Other Mode interface also supports querying or setting fan
speed RPM. This capability is decribed by LENOVO_CAPABILITY_DATA_00.
Besides, LENOVO_FAN_TEST_DATA provides reference data for self-test of
cooling fans, including minimum and maximum fan speed RPM.

This patchset turns lenovo-wmi-capdata01 into a unified driver (now
named lenovo-wmi-capdata) for LENOVO_CAPABILITY_DATA_{00,01} and
LENOVO_FAN_TEST_DATA; then adds HWMON support for lenovo-wmi-other:

 - fanX_enable: enable/disable the fan (tunable)
 - fanX_input: current RPM
 - fanX_max: maximum RPM
 - fanX_min: minimum RPM
 - fanX_target: target RPM (tunable)

This implementation doesn't require all capability data to be available,
and is capable to expose interfaces accordingly:

 - Having LENOVO_CAPABILITY_DATA_00: exposes fanX_{enable,input,target}
 - Having LENOVO_CAPABILITY_DATA_01: exposes firmware_attributes
 - Having LENOVO_FAN_TEST_DATA: exposes fanX_{max,min}

Rong Zhang (6):
  platform/x86: Rename lenovo-wmi-capdata01 to lenovo-wmi-capdata
  platform/x86: lenovo-wmi-{capdata,other}: Support multiple Capability
    Data
  platform/x86: lenovo-wmi-capdata: Add support for Capability Data 00
  platform/x86: lenovo-wmi-other: Add HWMON for fan speed RPM
  platform/x86: lenovo-wmi-capdata: Add support for Fan Test Data
  platform/x86: lenovo-wmi-other: Report min/max RPM and hide dummy fans

 .../wmi/devices/lenovo-wmi-other.rst          |  32 +
 drivers/platform/x86/lenovo/Kconfig           |   5 +-
 drivers/platform/x86/lenovo/Makefile          |   2 +-
 drivers/platform/x86/lenovo/wmi-capdata.c     | 545 ++++++++++++++++++
 drivers/platform/x86/lenovo/wmi-capdata.h     |  46 ++
 drivers/platform/x86/lenovo/wmi-capdata01.c   | 302 ----------
 drivers/platform/x86/lenovo/wmi-capdata01.h   |  25 -
 drivers/platform/x86/lenovo/wmi-other.c       | 422 +++++++++++++-
 8 files changed, 1028 insertions(+), 351 deletions(-)
 create mode 100644 drivers/platform/x86/lenovo/wmi-capdata.c
 create mode 100644 drivers/platform/x86/lenovo/wmi-capdata.h
 delete mode 100644 drivers/platform/x86/lenovo/wmi-capdata01.c
 delete mode 100644 drivers/platform/x86/lenovo/wmi-capdata01.h


base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
-- 
2.51.0