ACPI: thinkpad-acpi: add sysfs support to the thermal subdriver

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Export thinkpad thermal sensors to sysfs, following the hwmon
specification for thermal monitoring sensors.

ThinkPad thermal monitoring is done by the EC.  Sensors can show up or
disappear at runtime when they are inside hotswappable hardware, such as
batteries.  Sensors that are not available return -ENXIO when accessed.

Up to 16 thermal sensors are supported on new firmware (but nobody has
reported a ThinkPad with more than 12 sensors so far), and 8 sensors are
supported on older firmware.  Thermal sensor mapping is model-specific.
Precision varies, it is 1 degree Celcius on new ThinkPads, but higher on
some older models.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

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Henrique de Moraes Holschuh 2007-04-24 11:48:16 -03:00 • committed by Len Brown

parent 40ca9fdf8a

commit 2c37aa4e22

3 changed files with 143 additions and 7 deletions

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Documentation/thinkpad-acpi.txt

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