tree 6c4a2d551051e995baa59ef2fcd9c48da36b8ca7
parent 21e12c34712ef672372a1373d65b1df3414b7563
author Zev Weiss <zev@bewilderbeest.net> 1658188775 -0700
committer Ed Tanous <ed@tanous.net> 1667246407 +0000

hwmontempsensor: Manage devices on host power-state events

We now install handler callbacks for power event signals, deactivating
sensors on power-off and activating them on power-on/POST-complete
according to their PowerState configuration.  This is needed to properly
support sensor devices that are in the same power domain as the host,
and hence may need their drivers bound only after the host is powered on
so that the driver can properly probe and attach to the device (and
likewise be unbound when the host is powered off).

Tested: in combination with corresponding entity-manager patches to
prevent it from trying to manage the same devices, hwmontempsensor
successfully activates and deactivates host-power-domain nct6779 and
w83773g sensors on romed8hm3.  After the host is shut off, sensors
remain on dbus with 'Available' set to false and 'Value' reading NaN.
Also tested killing hwmontempsor after it instantiated host-power-domain
sensors, shutting off the host, and then restarting hwmontempsensor to
verify that it removed and re-created the sensor devices as necessary.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I2e272fd0870f3abfb06b6f3617f32721861bbc5b