I have verified the kernel pps_api only looks at CD by building a patch
cable to map the PPS signal into the CD pin and now all the pps_api
calls work as expected.
It is still my position that the kernel pps_api should look at all
commonly used control lines for PPS just like the pps-tools
According to linux/drivers/pps/clients/Kconfig
config PPS_CLIENT_LDISC
tristate "PPS line discipline"
depends on TTY
help
If you say yes here you get support for a PPS source connected
with the CD (Carrier Detect) pin of your serial port.
If this is
A possible cause for this bug has occurred to me, but I wouldn't know
where in the kernel code to check for this.
Note: When I talk about a control line, I am using the DTE, i.e
computer, end connector reference.
In years past there was no standardization for which line on a serial
port carried
I have rebooted with the oldest installed kernel, 5.4.0-54, and it too
has the bug.
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https://bugs.launchpad.net/bugs/1938626
Title:
PPS API broken
Status in linux package
I had been running with a USB GPS for years and recently purchased a GOOD GNSS
device, so I have not had anything on this machine that accesses the pps_api
until a few days ago.
FYI I have a Raspberry Pi with Ubuntu where the pps_api works with
raspberrypi-kernel 1:1.2010727-1 if that is of any
Hello Jim,
Did it work before with your system and got broken after a kernel
update? If yes, would you be able to identify the kernel version which
was working before? If you didn't run this use case before, would you be
able to boot with an older kernel version and check whether it works?
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