Re: multi-port usb-serial hub rules

On Sat, Jul 5, 2014 at 11:31 PM, Greg KH <[email protected]> wrote:
> On Sat, Jul 05, 2014 at 10:18:31PM -0400, shawn wilson wrote:
>> I've got a few usb to 4 serial port hubs. The problem is that
>> sometimes the ttyUSB* devs get resorted. I'm trying to write rules to
>> handle them (and maybe name the devices after the machines they're
>> connected to) however, I'm stuck because they only show up as one usb
>> device (and not another usb hub with a serial device on each port):
>
> What's wrong with the symlinks that show up in /dev/serial/ that should
> be "persistent"?
>

Yes, I think that'll work (though if it's possible, it would be cool
to figure out how to write the udev rule for it).

This is weird too (I think probably a bug?):
# ls /dev/serial/by-path/ -l
total 0
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:3:1.0-port0 -> ../../ttyUSB0
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:3:1.0-port1 -> ../../ttyUSB1
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:3:1.0-port2 -> ../../ttyUSB2
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:3:1.0-port3 -> ../../ttyUSB3
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:4:1.0-port0 -> ../../ttyUSB4
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:4:1.0-port1 -> ../../ttyUSB5
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:4:1.0-port2 -> ../../ttyUSB6
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:4:1.0-port3 -> ../../ttyUSB7
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:5:1.0-port0 -> ../../ttyUSB8
lrwxrwxrwx 1 root root 13 Jun 19 12:55
pci-0000:00:1d.7-usb-0:5:1.0-port1 -> ../../ttyUSB9
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:5:1.0-port2 -> ../../ttyUSB10
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:5:1.0-port3 -> ../../ttyUSB11
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:6:1.0-port0 -> ../../ttyUSB12
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:6:1.0-port1 -> ../../ttyUSB13
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:6:1.0-port2 -> ../../ttyUSB14
lrwxrwxrwx 1 root root 14 Jun 19 12:55
pci-0000:00:1d.7-usb-0:6:1.0-port3 -> ../../ttyUSB15
# ls /dev/serial/by-id/ -l
total 0
lrwxrwxrwx 1 root root 14 Jun 19 12:55
usb-Keyspan__a_division_of_InnoSys_Inc._Keyspan_USA-49WG-if00-port0 ->
../../ttyUSB12
lrwxrwxrwx 1 root root 13 Jun 19 12:55
usb-Keyspan__a_division_of_InnoSys_Inc._Keyspan_USA-49WG-if00-port1 ->
../../ttyUSB9
lrwxrwxrwx 1 root root 14 Jun 19 12:55
usb-Keyspan__a_division_of_InnoSys_Inc._Keyspan_USA-49WG-if00-port2 ->
../../ttyUSB14
lrwxrwxrwx 1 root root 13 Jun 19 12:55
usb-Keyspan__a_division_of_InnoSys_Inc._Keyspan_USA-49WG-if00-port3 ->
../../ttyUSB7