tree e4f7ab2f6c600691c64ebcba062a5690e1945d72
parent 058180f9d6e6b9d6f9deb75e3ebd09404e89bde6
author Mike Capps <mikepcapps@gmail.com> 1622040019 -0400
committer Mike Capps <mikepcapps@gmail.com> 1624549341 +0000

monitor: Read fan state from dbus inventory upon starting

tach sensors previously defaulted to functional. Now they default to the
inventory state. For counter-based sensors, nonfunctional state forces
the count to exceed the threshold.

Fan's functional state now depends on the number of functional sensors.

test plan:
1) power-off chassis, stop phosphor-fan-monitor service
2) use busctl to make a fan's tach sensor nonfunctional
3) start fan-monitor
4) verify the fan's state == nonfunctional
5) poweron chassis, verify that fan-monitor updates _sensor_ to
   functional
6) fan should remain nonfunctional
7) set Fan to non-present, then to present again (simulate
   replacement)
8) observe the fans functional state is now true in inventory

Signed-off-by: Mike Capps <mikepcapps@gmail.com>
Change-Id: I0a109a1d85390c0201f8a54942efcd2fb21a2b65