Date: Mon, 9 Feb 2009 11:31:10 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Cc: Nick Hibma <nick@anywi.com> Subject: Re: USB2 - umass problem Message-ID: <200902091131.12232.hselasky@c2i.net> In-Reply-To: <200902091035.26738.nick@anywi.com> References: <1233734352.1767.55.camel@localhost> <20090204.085606.1630229139.imp@bsdimp.com> <200902091035.26738.nick@anywi.com>
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On Monday 09 February 2009, Nick Hibma wrote: > > : > By some reason devfs semantic was changed: > > : > Instead of /dev/cuaU0.[0-2] and /dev/ttyU0.[0-2], I've get > > : > /dev/cuaU[0-2] /dev/ttyU[0-2] and! /dev/cuau1 /dev/ttyu1 > > : > What is reason for such change (additional port with lowercase 'u' > > : > and U[0-2] instead of more logical U0.[0-2]) ? > > : > > : It is because we are attaching drivers per interface instead of per > > : device. A new modem unit is allocated every time we find a modem, > > : simply put. If the modem has multiple instances in an interface, > > : /dev/cuaU0.[0...] will be created. Else /dev/cuaU... . > > > > Generally, we try not to change the details of how a device attaches > > /dev entries from release to release. Why the change? > > The USB1 u3g driver also attaches to interfaces, but collects all > interfaces in one go, leaving all unused interfaces available for other > drivers (e.g. umass) or claims them (to hide the 'driver disks'). It is the > main reason why I wrote a separate driver in the first place. Otherwise the > UMTS cards could be treated as serial ports without any port singalling. > > It is important to be able to determine in an automated way the 2 or more > serial ports that belong together. As an example: If you create a router > box that automatically configures itself depending on the hardware it > finds, we somehow need to find out which two serial ports are found on each > GPRS/UMTS card, so we can assign the first one to PPP and the other one to > our control application. > This has been fixed in P4 USB. --HPS
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