Messages in this thread | | | Date | Tue, 19 Jun 2007 11:09:05 +0200 | From | "Kay Sievers" <> | Subject | Re: [Linux-usb-users] Stable identification of identical USB hardware |
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On 6/18/07, Greg KH <greg@kroah.com> wrote: > On Mon, Jun 18, 2007 at 08:35:35AM -0700, Joerg Pommnitz wrote: > > I want to be able to distinguish between two (or more) mostly > > identical USB serial devices. The devices in question are UMTS modems. > > AFAIK they are identical except for the SIM card and the point of > > attachment. Externally the cards are CardBus devices with an > > integrated USB host adapter. The actual UMTS device is (internally) > > connected to the USB host adapter. > > > > If I have to cardbus sockets, how do I get from what I know ("the card > > is in socket 0") to "I have to talk to ttyUSB2 to talk to the card"? I > > suspect I have to follow the thread from /sys/bus/pci to > > /sys/bus/usb/devices, but how exactly? > > Walk up the "chain" of devices in sysfs and in udev. The udev man pages > and documentation should show you how to do this. If you have specific > questions about this, please ask them on the linux-hotplug-devel mailing > list.
This should create a symlink for the serial device in the first slot: KERNEL="ttyUSB*", SUBSYSTEMS=="pcmcia", KERNELS=="0.0", SYMLINK+="serial-slot0"
You find the keys used with udevinfo. Here is an example for a PCMCIA CF Memory card: udevinfo --attribute-walk --name hda4 ...
looking at device '/block/hda/hda4': KERNEL=="hda4" SUBSYSTEM=="block" ...
looking at parent device '/devices/pci0000:00/0000:00:1e.0/0000:04:00.0/0.0': KERNELS=="0.0" SUBSYSTEMS=="pcmcia" DRIVERS=="ide-cs" ...
looking at parent device '/devices/pci0000:00/0000:00:1e.0/0000:04:00.0': KERNELS=="0000:04:00.0" SUBSYSTEMS=="pci" DRIVERS=="yenta_cardbus" ...
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