[PATCH v3 0/1] hwmon: Add Minisforum UM780 XTX EC monitoring and fan control

[Sebastián Peyrott]

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 settings selected through its interface 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/20260818181345.203295-1-speyrott@xxxxxxxxx

Sebastián Peyrott (1):
  hwmon: Add Minisforum UM780 XTX EC monitoring and fan control

---
Changes in v3:
- return -EIO after bounded RPM coherence retries and -ENODATA for an
  unknown CPU profile;
- seed saved settings at probe, update them only after successful hwmon
  writes, and restore them at resume without reading the EC at suspend;
- clarify saved-state naming, live threshold validation, and resume
  documentation.

 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         | 501 ++++++++++++++++++++
 6 files changed, 594 insertions(+)
 create mode 100644 Documentation/hwmon/minisforum-um780xtx.rst
 create mode 100644 drivers/hwmon/minisforum-um780xtx.c


base-commit: 75f2c0b3690702c90863c2e138cb5520670845ea
-- 
2.54.0