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Date: Mon, 13 Dec 2010 08:56:51 +0100
From: Emanuel Haupt <ehaupt@FreeBSD.org>
To: Andrew Thompson <thompsa@FreeBSD.org>
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Cc: freebsd-usb@FreeBSD.org
Subject: Re: static usb device configuration
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Andrew Thompson <thompsa@FreeBSD.org> wrote:
> On 13 December 2010 07:49, Emanuel Haupt <ehaupt@freebsd.org> wrote:
> > Is there any way I can make sure that the following device:
> >
> > ugen1.3: <product 0x6001 vendor 0x0403> at usbus1, cfg=3D0 md=3DHOST
> > spd=3DFULL (12Mbps) pwr=3DON
> >
> > =A0bLength =3D 0x0012
> > =A0bDescriptorType =3D 0x0001
> > =A0bcdUSB =3D 0x0200
> > =A0bDeviceClass =3D 0x0000
> > =A0bDeviceSubClass =3D 0x0000
> > =A0bDeviceProtocol =3D 0x0000
> > =A0bMaxPacketSize0 =3D 0x0008
> > =A0idVendor =3D 0x0403
> > =A0idProduct =3D 0x6001
> > =A0bcdDevice =3D 0x0400
> > =A0iManufacturer =3D 0x0000 =A0<no string>
> > =A0iProduct =3D 0x0000 =A0<no string>
> > =A0iSerialNumber =3D 0x0003 =A0<Reader 195>
> > =A0bNumConfigurations =3D 0x0001
> >
> > Is always registered as:
> >
> > /dev/usb/1.3.0
>=20
> You would be better making a symlink using devd rules, something like
>=20
> 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