Re: multi-port usb-serial hub rules

В Sun, 6 Jul 2014 01:11:54 -0400
shawn wilson <[email protected]> пишет:

> 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?):

More likely that your device does not provide serial number, so
basically last link in serial/by-id wins in random order.

> # 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
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