Add a DMI-gated hwmon driver for both fans on the Minisforum UM780 XTX. The
EC is an ITE IT5571E, but its register layout and OEM commands are defined
by machine-specific firmware, so the driver only binds to the exact board
revision and BIOS version on which it was tested.
The driver exposes both fan-control temperatures and tachometers, two OEM
automatic CPU fan profiles, and two writable system-fan transition
temperatures. It preserves the selected settings across s2idle.
Tested on the target system with concurrent RPM reads, OEM profile changes,
system-fan threshold changes, unload/reload stress, and s2idle resume. The
settings were correct from the first userspace sample after resume and
remained stable for 15 seconds.
OpenAI Codex assisted with reverse-engineering review, code editing, test
orchestration, and patch and email preparation across a long interactive
session. I reviewed every change, ran the live tests on the target
hardware, and take responsibility for the submission.
Link: https://lore.kernel.org/r/20260807003842.249957-1-speyrott@gmail.com
Sebastián Peyrott (1):
hwmon: Add Minisforum UM780 XTX EC monitoring and fan control
---
Changes in v2:
- use standard hwmon callbacks for pwm1_enable and the hwmon lock for extra
attributes and PM operations;
- remove constant pwm2 attributes;
- align CPU/SYS temperature and fan channels and simplify their labels;
- round and clamp system-fan threshold writes, and cache the fixed limit;
- replace delayed work with suspend/save and synchronous resume/restore;
- simplify callback dispatch and error handling.
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/minisforum-um780xtx.rst | 68 +++
MAINTAINERS | 7 +
drivers/hwmon/Kconfig | 16 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/minisforum-um780xtx.c | 509 ++++++++++++++++++++
6 files changed, 602 insertions(+)
create mode 100644 Documentation/hwmon/minisforum-um780xtx.rst
create mode 100644 drivers/hwmon/minisforum-um780xtx.c
base-commit: 75f2c0b3690702c90863c2e138cb5520670845ea
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2.54.0