On Mon, 10 Jun 2013, Greg KH wrote: > > >> [lsusb output] The lsusb output in the original email message showed two configurations. Config 1 exposes a single port, whereas config 2 exposes two ports (although it is vendor-specific, not CDC-ACM). > > >>Even though I don't really understand the interfaces and endpoints, > > >>I get the impression there's multiple CDC-Data interfaces. > > > > > >Yes, there are, but the cdc-acm driver binds to them all (you can see > > >this by running 'usbdevices' from the usbutils package. > > > > T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 > > D: Ver= 1.10 Cls=02(commc) Sub=00 Prot=00 MxPS= 8 #Cfgs= 2 > > P: Vendor=152a ProdID=8230 Rev=01.10 > > S: Manufacturer=Septentrio > > S: Product=Septentrio USB Device > > C: #Ifs= 2 Cfg#= 1 Atr=c0 MxPwr=2mA > > I: If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=02 Prot=01 Driver=cdc_acm > > I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_acm This output confirms that there are two configurations, although only one of them is shown. By default, config 1 is installed. > > I can confirm :) How can this be changed? It is possible to switch to config 2 manually or by a pre-programmed script. The necessary command is very simple: echo 2 >/sys/bus/usb/devices/3-2/bConfigurationValue Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
