Re: Udev rule for HSDPA modem

[Greg KH <greg@kroah.com>]

On Wed, Dec 03, 2008 at 04:11:29PM +0100, Kay Sievers wrote:
> On Wed, 2008-12-03 at 13:12 +0100, Kay Sievers wrote:
> > On Wed, Dec 3, 2008 at 10:27, Kay Sievers <kay.sievers@vrfy.org> wrote:
> > > On Wed, Dec 3, 2008 at 07:45, Greg KH <greg@kroah.com> wrote:
> > >> On Sun, Nov 30, 2008 at 06:21:11AM +0100, Kay Sievers wrote:
> > >>> On Sat, Nov 29, 2008 at 18:37, Greg KH <greg@kroah.com> wrote:
> > >>> > On Sat, Nov 29, 2008 at 10:00:59AM +0200, Jar wrote:
> > >>> >> Greg KH wrote:
> > >>> >>> HAL contains a list of these modems and a mapping of each port to what
> > >>> >>> it does based on the specific device.
> > >>> >>> Try using that instead of udev specific rules for your accessed to the
> > >>> >>> modem, it will work much better.
> > >>> >>
> > >>> >> Thanks for your reply! Does HAL require that I have desktop installed, this
> > >>> >> is my home "server" machine without X? Do you have any starting point or
> > >>> >> where to learn more how to do this with HAL.
> > >>> >
> > >>> > I do not think HAL requires X.  Try asking on your distro mailing list
> > >>> > for how they have incorporated HAL into the releases you are using.
> > >>>
> > >>> It might get pretty complicated to use D-Bus/HAL for simple setups,
> > >>> and rather static configurations like this. NetworkManager handles
> > >>> that, and we will even get modem-probing soon, but in cases like this
> > >>> it might be easier to have a simple - not very flexible - but working
> > >>> solution.
> > >>>
> > >>> Maybe we can have an "index" sysfs file at the serial device, which
> > >>> carries the instance number, per usb device? This would allow us to
> > >>> create persistent links which do not depend on the kernel device
> > >>> enumeration across multiple device.
> > >>>
> > >>> We did the same for v4l devices recently:
> > >>>   http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;hS9a7555b31e65e66fb84c881d07d2bf18c974d0
> > >>>
> > >>> Greg, what do you think?
> > >>
> > >> Don't we already have something like this today (the "ports" on an
> > >> individual usb-serial device)?  Or do we just need to export that a bit
> > >> better?
> > >
> > > Yeah, maybe that works already. I don't have such a device.
> > 
> > Ok, I found one. You mean "port_number", right? But unfortunately it
> > looks pretty useless in this case. :)
> > 
> >   $ grep . /sys/bus/usb-serial/devices/*/port_number
> >   /sys/bus/usb-serial/devices/ttyUSB1/port_number:0
> >   /sys/bus/usb-serial/devices/ttyUSB2/port_number:0
> > 
> > They would only be not "0" if the serial lines would be on the same
> > usb interface?
> > 
> > We would need a per-device enumeration, but that's nothing the
> > usb-serial stuff knows/cares about if we have different usb
> > interfaces, right?
> 
> Greg, do you have a usb multi-port serial card? Can you possibly give
> this a try, and show us "tree /dev/serial"?
> 
> I have this here now for my "simple" devices:
>   /dev/serial
>   `-- by-id
>       |-- usb-067b_2303-serial-if00-port0 -> ../../ttyUSB0
>       |-- usb-HUAWEI_Technology_HUAWEI_Mobile-serial-if00-port0 -> ../../ttyUSB1
>       `-- usb-HUAWEI_Technology_HUAWEI_Mobile-serial-if01-port0 -> ../../ttyUSB2
> 
> If we can make that work as expected, I'll look into by-path/, so we can
> have identical devices properly identified, if needed. Then we can check
> how we should finally name all that, and possibly add that stuff to the
> default rule set.


This looks good, here's the output using udev 133 and the rules and a
few usb-serial devices plugged into the system at the same time:

$ tree /dev/serial/
/dev/serial/
`-- by-id
    |-- usb-Inside_Out_Networks_Edgeport
    |   |-- 4_04-01-006467-serial-if00-port0 -> ../../../ttyUSB0
    |   |-- 4_04-01-006467-serial-if00-port1 -> ../../../ttyUSB1
    |   |-- 4_04-01-006467-serial-if00-port2 -> ../../../ttyUSB2
    |   `-- 4_04-01-006467-serial-if00-port3 -> ../../../ttyUSB3
    |-- usb-Keyspan__a_division_of_InnoSys_Inc._USB_4-port_Serial_Adapter-serial-if00-port0 -> ../../ttyUSB8
    |-- usb-Keyspan__a_division_of_InnoSys_Inc._USB_4-port_Serial_Adapter-serial-if00-port1 -> ../../ttyUSB9
    |-- usb-Keyspan__a_division_of_InnoSys_Inc._USB_4-port_Serial_Adapter-serial-if00-port2 -> ../../ttyUSB10
    |-- usb-Keyspan__a_division_of_InnoSys_Inc._USB_4-port_Serial_Adapter-serial-if00-port3 -> ../../ttyUSB11
    |-- usb-Prolific_Technology_Inc._USB-Serial_Controller-serial-if00-port0 -> ../../ttyUSB7
    |-- usb-Sierra_Wireless__Incorporated_AirCard-serial-if00-port0 -> ../../ttyUSB4
    |-- usb-Sierra_Wireless__Incorporated_AirCard-serial-if00-port1 -> ../../ttyUSB5
    `-- usb-Sierra_Wireless__Incorporated_AirCard-serial-if00-port2 -> ../../ttyUSB6

I'm not so sure about the long names, but it is unique :)

thanks,

greg k-h