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authorJames Seo <james@equiv.tech>2023-05-22 14:56:46 +0300
committerGuenter Roeck <linux@roeck-us.net>2023-06-08 16:41:19 +0300
commit23902f98f8d4811ab84dde6419569a5b374f8122 (patch)
tree55625acd5156a4d080a3a3b7deafc118bf801fcb /Documentation/hwmon/index.rst
parent7590e659e063dc45a5743bb4e5eb4a21ee1fd651 (diff)
downloadlinux-23902f98f8d4811ab84dde6419569a5b374f8122.tar.xz
hwmon: add HP WMI Sensors driver
Hewlett-Packard (and some HP Compaq) business-class computers report hardware monitoring information via WMI. This driver exposes that information to hwmon. Initial support is provided for temperature, fan speed, and intrusion sensor types. Provisional support is provided for voltage and current sensor types. HP's WMI implementation permits many other types of numeric sensors. Therefore, a debugfs interface is also provided to enumerate and inspect all numeric sensors visible on the WMI side. This should facilitate adding support for other sensor types in the future. Tested on a HP Z420, a HP EliteOne 800 G1, and a HP Compaq Elite 8300 SFF. Note that provisionally supported sensor types are untested and seem to be rare-to-nonexistent in the wild, having been encountered neither on test systems nor in ACPI dumps from the Linux Hardware Database. They are included because their popularity in general makes their presence on past or future HP systems plausible and because no doubt exists as to how the sensors themselves would be represented in WMI (alarm attributes will need to wait for hardware to be located). A 2005 HP whitepaper gives the relevant sensor object MOF definition and sensor value scaling calculation, and both this driver and the official HP Performance Advisor utility comply with them (confirmed in the latter case by reverse engineering). Link: https://h20331.www2.hp.com/hpsub/downloads/cmi_whitepaper.pdf Signed-off-by: James Seo <james@equiv.tech> Link: https://lore.kernel.org/r/20230522115645.509701-1-james@equiv.tech [groeck: Set error return value for intrusion writes to -EINVAL. Always accept writes of 0 even if there was no intrusion. ] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@@ -77,6 +77,7 @@ Hardware Monitoring Kernel Drivers
gl518sm
gxp-fan-ctrl
hih6130
+ hp-wmi-sensors
ibmaem
ibm-cffps
ibmpowernv