[Nut-upsdev] Looking for history: usbhid-ups - powercom.

[deference at null.net]

Hello,
This is a cross post in an attempt to dig up a bit a history and
hopefully some tips regarding the driver for POWERCOM UPS devices. The
discussion is on the LKML and can be viewed here:
https://lkml.org/lkml/2021/11/14/375

In the NUT source tree there is:
https://github.com/networkupstools/nut/blob/master/drivers/usbhid-ups.c

This is a driver for some ups devices. I own a powercom one, a newer model
we think, that disconnects and reconnects continuously from the Linux
Kernel (version 5.15.X). My UPS's vendor ID is 0d9f (POWERCOM) and the
product ID is 0004. It's called "OPTI-UPS Thunder Shield TS2250B".
  There's a quirk entry in the Linux kernel for entry for 0d9f:0002. It
tells the kernel to completely ignore the UPS and allow something else
(NUT?) to handle it.
  The Linux Kernel driver says to not request reports from USB devices as
this can be problematic for some of them. Ben notes that,
"HID_QUIRK_ALWAYS_POLL *might* be a way to force the [UPS] device to stay
with a USB connection up."

We would like to know, does anyone know the history of this?

Do you have any tips on getting my UPS to talk to my Linux PC?

Should I be asking for help with my UPS from the NUT team instead of the
Linux Kernel devs because you have a driver for some UPS-es?

Thanks,
David