On Mon, 26 Apr 2010, Josua Dietze wrote: > MichaÅ? Nazarewicz schrieb: > > > On Mon, 26 Apr 2010 16:16:05 +0200, Daniel Mack <daniel@xxxxxxxx> wrote: > >> Are you sure they don't do exactly that by running two interfaces in > >> the same configuration? > > > > Yes, I'm sure. I've investigated an USB GSM modem which, when plugged > > for the first time reports as mass storage (single configuration, single > > interface) and when drivers are installed as a full blown composite > > gadget. I still haven't figured out how it does that. > > > These are the notorious mode switching devices. In Windows, they > obviously install a special storage driver doing one specific action > on each following plugging. > This action - some storage or control command - will "flip" the > device, making it "disconnect" and returning as a completely different > composite device. > > Storage commands used for this procedure range from "SCSI rezero" over > "passthrough" to "SCSI eject", or involve vendor specific stuff. I was going to say the same thing. For ease of use, I recommend using a "SCSI eject" to trigger the mode change. That way, Linux users who don't have the usb-modeswitch program installed can get the same effect by running eject. 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
