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This change adds a cooling device driver to notify the user space of the
thermal trip event. To avoid having user space process poll the
cooling state, a sysfs node is exposed that supports blocking reads.
The driver also supports a timeout (in milliseconds) for blocking reads
which can be done by writing the value to thermal_trip_event_block node
before reading. The blocked user space process will be woken up when the
cooling device becomes active or times out.
Bug 4261645
Bug 1688327
Signed-off-by: Yi-Wei Wang <yiweiw@nvidia.com>
Change-Id: Ic89406ba2713e5bc8f3806d6cfeb462601c73a7d
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3015652
(cherry picked from commit 856471d64f)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3019213
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>