psu-ng: INPUT_HISTORY syncHistory
Add in the function that syncs the power supply input history data
between all the installed power supplies.
Use the GPIO line name instead of gpiochip and number. Use libgpiod via
helper utility. Create a toggleLowHigh() to use for synchronizing the
input history.
Add in indicator and helper functions to indicate a syncHistory is
needed if a power supply goes from missing to present.
Trace when syncHistory is called. This should be infrequent enough that
I do not think it would be a problem.
Initial testing on Rainier 2S2U did not need a lengthy delay between
lowering and raising the power-ffs-sync-history GPIO, but testing on
Rainier 2S4u required a longer delay.
Depends-On: Ib1ac2456f7f715360d089dfa4b6b379b516439ab
Change-Id: I022806155139d70fb4a42cc27eb9f279f6a3aedc
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/phosphor-power-supply/util.cpp b/phosphor-power-supply/util.cpp
index 0a7e20d..503e1c3 100644
--- a/phosphor-power-supply/util.cpp
+++ b/phosphor-power-supply/util.cpp
@@ -106,6 +106,14 @@
}
}
+void GPIOInterface::toggleLowHigh(const std::chrono::milliseconds& delay)
+{
+ auto flags = gpiod::line_request::FLAG_OPEN_DRAIN;
+ write(0, flags);
+ std::this_thread::sleep_for(delay);
+ write(1, flags);
+}
+
std::unique_ptr<GPIOInterfaceBase> createGPIO(const std::string& namedGpio)
{
return GPIOInterface::createGPIO(namedGpio);