a28b088ede
Add hardware monitoring support for the LattePanda Sigma SBC (DFRobot, ITE IT8613E EC). The driver reads fan speed and temperatures via direct port I/O, as the BIOS disables the ACPI EC interface. Signed-off-by: Mariano Abad <weimaraner@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
61 lines
2 KiB
ReStructuredText
61 lines
2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver lattepanda-sigma-ec
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=================================
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Supported systems:
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* LattePanda Sigma (Intel 13th Gen i5-1340P)
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DMI vendor: LattePanda
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DMI product: LattePanda Sigma
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BIOS version: 5.27 (verified)
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Datasheet: Not available (EC registers discovered empirically)
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Author: Mariano Abad <weimaraner@gmail.com>
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Description
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-----------
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This driver provides hardware monitoring for the LattePanda Sigma
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single-board computer made by DFRobot. The board uses an ITE IT8613E
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Embedded Controller to manage a CPU cooling fan and thermal sensors.
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The BIOS declares the ACPI Embedded Controller (``PNP0C09``) with
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``_STA`` returning 0, preventing the kernel's ACPI EC subsystem from
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initializing. This driver reads the EC directly via the standard ACPI
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EC I/O ports (``0x62`` data, ``0x66`` command/status).
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Sysfs attributes
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----------------
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======================= ===============================================
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``fan1_input`` Fan speed in RPM (EC registers 0x2E:0x2F,
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16-bit big-endian)
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``fan1_label`` "CPU Fan"
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``temp1_input`` Board/ambient temperature in millidegrees
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Celsius (EC register 0x60, unsigned)
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``temp1_label`` "Board Temp"
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``temp2_input`` CPU proximity temperature in millidegrees
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Celsius (EC register 0x70, unsigned)
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``temp2_label`` "CPU Temp"
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======================= ===============================================
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Module parameters
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-----------------
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``force`` (bool, default false)
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Force loading on BIOS versions other than 5.27. The driver still
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requires DMI vendor and product name matching.
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Known limitations
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-----------------
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* Fan speed control is not supported. The fan is always under EC
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automatic control.
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* The EC register map was verified only on BIOS version 5.27.
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Other versions may use different register offsets; use the ``force``
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parameter at your own risk.
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