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.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver lattepanda-sigma-ec
=================================
Supported systems:
* LattePanda Sigma (Intel 13th Gen i5-1340P)
DMI vendor: LattePanda
DMI product: LattePanda Sigma
BIOS version: 5.27 (verified)
Datasheet: Not available (EC registers discovered empirically)
Author: Mariano Abad <weimaraner@gmail.com>
Description
-----------
This driver provides hardware monitoring for the LattePanda Sigma
single-board computer made by DFRobot. The board uses an ITE IT8613E
Embedded Controller to manage a CPU cooling fan and thermal sensors.
The BIOS declares the ACPI Embedded Controller (``PNP0C09``) with
``_STA`` returning 0, preventing the kernel's ACPI EC subsystem from
initializing. This driver reads the EC directly via the standard ACPI
EC I/O ports (``0x62`` data, ``0x66`` command/status).
Sysfs attributes
----------------
======================= ===============================================
``fan1_input`` Fan speed in RPM (EC registers 0x2E:0x2F,
16-bit big-endian)
``fan1_label`` "CPU Fan"
``temp1_input`` Board/ambient temperature in millidegrees
Celsius (EC register 0x60, unsigned)
``temp1_label`` "Board Temp"
``temp2_input`` CPU proximity temperature in millidegrees
Celsius (EC register 0x70, unsigned)
``temp2_label`` "CPU Temp"
======================= ===============================================
Module parameters
-----------------
``force`` (bool, default false)
Force loading on BIOS versions other than 5.27. The driver still
requires DMI vendor and product name matching.
Known limitations
-----------------
* Fan speed control is not supported. The fan is always under EC
automatic control.
* The EC register map was verified only on BIOS version 5.27.
Other versions may use different register offsets; use the ``force``
parameter at your own risk.
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