Allow disabling PID loops at runtime
<design concept>
Add the map of object enable interface to pid loops
in the zone then we can disable/enable each pid loop
process in a zone by dbus command.
[note]
Enable = true : enable process (default)
Enable = false : disable process
Tested:
In this case: we set Enable = false to disable
pidloop:Zone_Temp_0, and see how it affects
the zone final pwm, when pidloop: Zone_Temp_0
in zone 0 is disabled.
then even we are trying to heat up the temperature
of a sensor: Temp_0 in pidloop: Zone_Temp_0, this
set point of the pidloop will not be taken into the
calculation for the final set point of the whole zone.
```
<service object>
root@openbmc:/tmp# busctl tree xyz.openbmc_project.State.FanCtrl
`-/xyz
`-/xyz/openbmc_project
`-/xyz/openbmc_project/settings
`-/xyz/openbmc_project/settings/fanctrl
|-/xyz/openbmc_project/settings/fanctrl/zone0
| |-/xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp
| |-/xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp_0
| `-/xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp_1
====Enable process for pidloop:Zone_Temp_0 with p-switch temperature sensor:Temp_0 at runtime====
root@openbmc:~# busctl introspect xyz.openbmc_project.State.FanCtrl /xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp_0
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
xyz.openbmc_project.Object.Enable interface - - -
.Enabled property b true emits-change writable
====Disable process for pidloop:Zone_Temp_0 with p-switch temperature sensor: Temp_0====
root@openbmc:~# busctl set-property xyz.openbmc_project.State.FanCtrl /xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp_0 xyz.openbmc_project.Object.Enable Enabled b false
root@openbmc:~# busctl introspect xyz.openbmc_project.State.FanCtrl /xyz/openbmc_project/settings/fanctrl/zone0/Zone_Temp_0
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
xyz.openbmc_project.Object.Enable interface - - -
.Enabled property b false emits-change writable
```
when Disable the process of the pidloop: Zone_Temp_0,
the requester switches from Zone_Temp_0 to the others,
when you enable the pidloop: Zone_Temp_0, the setpoint
of Zone_Temp_0 will be take into consideration again
Change-Id: I95ae700144f0d16049fff8b309f05ae690a7ef72
Signed-off-by: ykchiu <Chiu.YK@inventec.com>
diff --git a/interfaces.hpp b/interfaces.hpp
index 5e99d19..7f4b4cd 100644
--- a/interfaces.hpp
+++ b/interfaces.hpp
@@ -7,7 +7,7 @@
struct ReadReturn
{
- double value;
+ double value = std::numeric_limits<double>::quiet_NaN();
std::chrono::high_resolution_clock::time_point updated;
double unscaled = value;