Re: APC UPS hid driver

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

On 10/07/2022 19:31, Greg Troxel wrote:
> Dima Veselov <kab00m%lich.phys.spbu.ru@localhost> writes:
>
> > Greetings,
> >
> > I am using NetBSD 9_STABLE and I would like to connect UPS via USB serial
> > port. UPS is detected as ugen device
> >
> >   port 2 addr 3: low speed, self powered, config 1, Smart-UPS 750 FW:651.13.I USB FW:7.3(0x0002), American Power Conversion(0x051d), rev 0.06(0x0006), serial AS0714242055
>
> Are you using the ups-nut package?  If so it will be user "nut".  CHeck
> that this user can read/write the ugen device.  I use serial and have
> the port symlinked to a stable name and chowned.
>
> > sysutils/ups-nut-usb can't detect UPS and my question is:
> >
> > Is it neccesary for UPS to be detected as a hid device and this means that
> > kernel miss something or it is a problem of usbhid-ups/libusb ?
>
> I really don't know as I have never used a hid UPS.  See uhid(4) but I
> would more or less expect (without knowing or understanding) that it
> could use libusb for this.

Don't know about nut but apcupsd detects non-hid APC UPS's just fine. My 
current one reports as:

ugen0 at uhub0 port 2
ugen0: American Power Conversion (0x51d) Back-UPS XS 1400U  FW:926.T2 .I 
USB FW:T2 (0x02), rev 1.10/1.06, addr 2

Looking at the nut documentation you can then access the UPS via apcupsd 
for those UPS's it can't talk to directly.

If the UPS was a HID device I'd expected a uhid attachment as well but 
from memory there might be some logic in the kernel blocking that as 
libusb needs a ugen attachment to work.

Mike