tree 24e7ca2797fc3e459ecee95b94ea7cc478c567e7
parent d653b75cd14493150b3823acb8eeeff1218c6284
author Konstantin Aladyshev <aladyshev22@gmail.com> 1619772643 +0000
committer Ed Tanous <ed@tanous.net> 1630088800 +0000

psusensor: Add support for the 'PowerState' parameter

When CPU is powered off, some sensor reading values are expected
to go below low thresholds. To prevent unnecessary sensor readings
and redundant threshold event trigger in cases like that add support
for the 'PowerState' JSON configuration parameter similar to other
'dbus-sensors' apps.
Use 'checkThresholdsPowerDelay' function in a threshold check like
it is done in ADCSensor app. This is necessary as PSU data can drop
faster than a change in a power state is noticed.

Tested on the AMD EthanolX CRB with ISL68137:

When the PowerState is set to "On" and the platform is powered off,
no transactions are observed on the corresponding I2C bus.

When the PowerState is set to "Always" monitoring is always enabled
and I2C transactions are always observed regardless the platform
power state.

These commands were used to monitor transactions
on the I2C bus:
$ echo 1 > /sys/kernel/debug/tracing/tracing_on
$ echo 1 > /sys/kernel/debug/tracing/events/i2c/i2c_read/enable
$ cat /sys/kernel/debug/tracing/trace_pipe

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: Ic7b36e48828adf4eb2f7714965a4a1df4eb5ac3e