Re: Novatel U727

[Dan Williams <dcbw redhat com>]

On Sun, 2008-11-30 at 19:09 -0800, Craig Carl wrote:
> Dan et all -
>    
>     I use a Novatel U727 modem on Sprint, it is working well with .7.
> The U727 is weird in that when it is first plugged into a USB port it is
> mounted as a CD-ROM drive - (messages on a Ubuntu 8.10 desktop) -
> 
> Nov 30 18:46:53 laptop kernel: [ 3968.548081] usb 2-2: new full speed
> USB device using uhci_hcd and address 4
> Nov 30 18:46:53 laptop kernel: [ 3968.722628] usb 2-2: configuration #1
> chosen from 1 choice
> Nov 30 18:46:53 laptop kernel: [ 3968.733992] scsi4 : SCSI emulation for
> USB Mass Storage devices
> Nov 30 18:46:58 laptop kernel: [ 3973.745431] scsi 4:0:0:0:
> CD-ROM            Novatel  Mass Storage     1.00 PQ: 0 ANSI: 2
> Nov 30 18:46:58 laptop kernel: [ 3973.817859] sr1: scsi-1 drive
> Nov 30 18:46:58 laptop kernel: [ 3973.819222] sr 4:0:0:0: Attached scsi
> generic sg2 type 5
> 
>     The GSM modem is "hidden". Only after umount'ing the CD-ROM drive
> does the modem show up -
> 
> Nov 30 18:48:10 laptop kernel: [ 4046.040093] usb 2-2: USB disconnect,
> address 4
> Nov 30 18:48:12 laptop kernel: [ 4047.272038] usb 2-2: new full speed
> USB device using uhci_hcd and address 5
> Nov 30 18:48:12 laptop kernel: [ 4047.448612] usb 2-2: configuration #1
> chosen from 1 choice
> Nov 30 18:48:12 laptop kernel: [ 4047.452171] option 2-2:1.0: GSM modem
> (1-port) converter detected
> Nov 30 18:48:12 laptop kernel: [ 4047.452747] usb 2-2: GSM modem
> (1-port) converter now attached to ttyUSB0
> Nov 30 18:48:12 laptop kernel: [ 4047.456037] option 2-2:1.1: GSM modem
> (1-port) converter detected
> Nov 30 18:48:12 laptop kernel: [ 4047.456466] usb 2-2: GSM modem
> (1-port) converter now attached to ttyUSB1
> Nov 30 18:48:12 laptop kernel: [ 4047.458862] option 2-2:1.2: GSM modem
> (1-port) converter detected
> Nov 30 18:48:12 laptop kernel: [ 4047.460429] usb 2-2: GSM modem
> (1-port) converter now attached to ttyUSB2
> Nov 30 18:48:12 laptop kernel: [ 4047.463144] option 2-2:1.3: GSM modem
> (1-port) converter detected
> Nov 30 18:48:12 laptop kernel: [ 4047.463466] usb 2-2: GSM modem
> (1-port) converter now attached to ttyUSB3
> 
> 
>     To make my life easier I have a small process that uses Net::Dbus to
> attach to the system bus and watches for that Novatel SCSI device to
> attach, then it immediately umount's it.
> 
>     My question is this - Should it be NetworkManager's responsibility
> to watch for the U727 and make it available as a GSM modem, or should
> that umount code remain outside of NetworkManager?

The kernel driver has this responsibility.  Could you provide the output
of 'lsusb -v' both before eject *and* after eject?  That would allow me
to better add this support to the kernel.  Sierra devices already do
this transparently, and so should the drivers for Novatel, Option/hso,
and other devices.  Just need to write some small patches for it.

Thanks!
Dan