Date: Thu, 3 Oct 2019 16:26:37 +0930 From: "O'Connor, Daniel" <darius@dons.net.au> To: Oleksandr Rybalko <ray@ddteam.net> Cc: freebsd-usb@freebsd.org Subject: Re: USB serial ports by serial number Message-ID: <40CAFE90-B8F6-4A9B-A6D0-671D2DCEED52@dons.net.au> In-Reply-To: <CAJ1Oi8HeyBvn4UYSDAh8gGxj0hPv-vgFZ9ArNX95CTniuQa80g@mail.gmail.com> References: <CC980A9B-8F41-4C2A-A729-2CC690DFDA7E@dons.net.au> <CAJ1Oi8HeyBvn4UYSDAh8gGxj0hPv-vgFZ9ArNX95CTniuQa80g@mail.gmail.com>
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> On 3 Oct 2019, at 16:12, Oleksandr Rybalko <ray@ddteam.net> wrote:
> Looks like you are lucky guy :)
> Most of USB-serial devices have "very stable" serial number :)
> more than 50% have S/N "0123456789".
These are either FTDI (or possibly clones..) or a Micropython board so I =
guess avoiding CH341s is paying off :)
> So, sometime you change will do it's job.
Yes, it should be possible but of course not if the manufacturer has =
really cheaped out :(
> IMO, better to track hub/port.
No reason you couldn't do that (either instead or as well) with some =
very basic script modifications.
Perhaps I should have made /dev/usbserialbysn and put symlinks in that.
> Thanks.
>=20
>=20
> =D1=87=D1=82, 3 =D0=B6=D0=BE=D0=B2=D1=82. 2019 =D0=BE 05:56 O'Connor, =
Daniel <darius@dons.net.au> =D0=BF=D0=B8=D1=88=D0=B5:
> Hi,
> I have several USB serial ports on a machine and I don't want to rely =
on attach order to get various programs to talk to the correct serial =
port.
>=20
> I wrote the following devd script and shell script to create symlinks =
from cu.${sernum}/tty.${sernum} to the real device nodes.
>=20
> I post it here in the hope other people find it useful.
>=20
> [maarsytest 2:49] ~> cat /usr/local/etc/devd/usbserialsn.conf
> attach 100 {
> device-name ".*";
> match "ttyname" ".+";
> match "ugen" ".+";
> match "sernum" ".+";
> action "/usr/local/libexec/usbserialsn attach $device-name =
$sernum $ttyname";
> };
>=20
> detach 100 {
> device-name ".*";
> action "/usr/local/libexec/usbserialsn detach $device-name";
> };
> [maarsytest 2:49] ~> cat /usr/local/libexec/usbserialsn
> #!/bin/sh
>=20
> if [ $# -lt 2 ]; then
> echo "Bad usage"
> exit 1
> fi
>=20
> mode=3D$1
> devname=3D$2
> sernum=3D$3
> ttyname=3D$4
>=20
> case "$mode" in
> attach)
> if [ $# -ne 4 ]; then
> echo "Bad usage"
> exit 1
> fi
> ln -sf cua${ttyname} /dev/cu.${sernum}
> ln -sf tty${ttyname} /dev/tty.${sernum}
> echo ${sernum} >/var/run/usbserialsn.${devname}
> ;;
>=20
> detach)
> if [ $# -ne 2 ]; then
> echo "Bad usage"
> exit 1
> fi
> if [ ! -e /var/run/usbserialsn.${devname} ]; then
> exit 0
> fi
> sernum=3D$(cat /var/run/usbserialsn.${devname})
> rm -f /dev/cu.${sernum} /dev/tty.${sernum} =
/var/run/usbserialsn.${devname}
> ;;
>=20
> *)
> echo "Unknown mode"
> exit 1
> ;;
> esac
>=20
> It would be a lot simpler if devd reported the same things on detach =
as it does on attach but I am not sure how difficult that would be to =
achieve (presumably it would require caching them).
>=20
> --
> Daniel O'Connor
> "The nice thing about standards is that there
> are so many of them to choose from."
> -- Andrew Tanenbaum
>=20
>=20
> _______________________________________________
> freebsd-usb@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-usb
> To unsubscribe, send any mail to "freebsd-usb-unsubscribe@freebsd.org"
>=20
>=20
> --=20
> WBW
> -------
> Rybalko Aleksandr <ray@ddteam.net>
>=20
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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