static usb device configuration

[Emanuel Haupt]

Andrew Thompson <thompsa at FreeBSD.org> wrote:
> On 13 December 2010 07:49, Emanuel Haupt <ehaupt at freebsd.org> wrote:
> > Is there any way I can make sure that the following device:
> >
> > ugen1.3: <product 0x6001 vendor 0x0403> at usbus1, cfg=0 md=HOST
> > spd=FULL (12Mbps) pwr=ON
> >
> >  bLength = 0x0012
> >  bDescriptorType = 0x0001
> >  bcdUSB = 0x0200
> >  bDeviceClass = 0x0000
> >  bDeviceSubClass = 0x0000
> >  bDeviceProtocol = 0x0000
> >  bMaxPacketSize0 = 0x0008
> >  idVendor = 0x0403
> >  idProduct = 0x6001
> >  bcdDevice = 0x0400
> >  iManufacturer = 0x0000  <no string>
> >  iProduct = 0x0000  <no string>
> >  iSerialNumber = 0x0003  <Reader 195>
> >  bNumConfigurations = 0x0001
> >
> > Is always registered as:
> >
> > /dev/usb/1.3.0
> 
> You would be better making a symlink using devd rules, something like
> 
> notify 100 {
>         match "system"          "USB";
>         match "subsystem"       "DEVICE";
>         match "type"            "ATTACH";
>         match "vendor"          "0x0403";
>         match "product"         "0x6001";
>         action "ln -s /dev/$cdev /dev/mydevice";
> };

Unfortunately the program in question uses libusb and the configuration
only allows to define the device by specifying <busnum>:<devaddr> and
there are multiple identical devices around with only iSerialNumber
being different from each other. Somehow I need to make sure the
devices in the USB hub are always recognized in the same order.

I guess one solution would be to generate the configuration each time
the program starts.

Emanuel