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The thermal engine monitors the temperature readings from all sensors.
For each sensor, five threshold temperatures can be set:
1. Low fan speed.
2. High fan speed.
3. SMI warning.
4. Shutdown CPU.
5. Shutdown everything we can.
Each of these thresholds can be set to either a fixed value or disabled.
Currently the real implementation of SMI warning and shutting down is
left as TODO, as indicated in the comment.
Signed-off-by: Vic Yang <victoryang@chromium.org>
BUG=chrome-os-partner:8250
TEST=Manually change threshold value to test all actions can be triggered.
Change-Id: If168dcff78ef2d7a3203cb227e1739a08eca961e