multi-port usb-serial hub rules

multi-port usb-serial hub rules

[shawn wilson]

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):

  looking at device
'/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/ttyUSB11/tty/ttyUSB11':
    KERNEL="ttyUSB11"
    SUBSYSTEM="tty"
    DRIVER=""

  looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/ttyUSB11':
    KERNELS="ttyUSB11"
    SUBSYSTEMS="usb-serial"
    DRIVERS="keyspan_4"
    ATTRS{port_number}="3"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0':
    KERNELS="2-5:1.0"
    SUBSYSTEMS="usb"
    DRIVERS="keyspan"
    ATTRS{bInterfaceClass}="ff"
    ATTRS{bInterfaceSubClass}="00"
    ATTRS{bInterfaceProtocol}="00"
    ATTRS{bNumEndpoints}="06"
    ATTRS{supports_autosuspend}="1"
    ATTRS{bAlternateSetting}=" 0"
    ATTRS{bInterfaceNumber}="00"

and another port on the same device:
  looking at device
'/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/ttyUSB8/tty/ttyUSB8':
    KERNEL="ttyUSB8"
    SUBSYSTEM="tty"
    DRIVER=""

  looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/ttyUSB8':
    KERNELS="ttyUSB8"
    SUBSYSTEMS="usb-serial"
    DRIVERS="keyspan_4"
    ATTRS{port_number}="0"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0':
    KERNELS="2-5:1.0"
    SUBSYSTEMS="usb"
    DRIVERS="keyspan"
    ATTRS{bInterfaceClass}="ff"
    ATTRS{bInterfaceSubClass}="00"
    ATTRS{bInterfaceProtocol}="00"
    ATTRS{bNumEndpoints}="06"
    ATTRS{supports_autosuspend}="1"
    ATTRS{bAlternateSetting}=" 0"
    ATTRS{bInterfaceNumber}="00"

So, if I just want to create a symlink, I could match on
KERNELS="ttyUSB*", ATTRS{port_number}="blah" and be good, however
since things sometimes become resorted, I'd like to match on both the
usb port (in the below stanza's KERNELS) and the 'port_number' in the
one above. How do I do that?

Re: multi-port usb-serial hub rules

[Greg KH]

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"?

thanks,

greg k-h

Re: multi-port usb-serial hub rules

[shawn wilson]

On Sat, Jul 5, 2014 at 11:31 PM, Greg KH <greg@kroah.com> 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

Re: multi-port usb-serial hub rules

[Andrey Borzenkov]

В Sun, 6 Jul 2014 01:11:54 -0400
shawn wilson <ag4ve.us@gmail.com> пишет:

> On Sat, Jul 5, 2014 at 11:31 PM, Greg KH <greg@kroah.com> 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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