On sobota 23. ledna 2016 13:46:32 CET Bjørn Mork wrote: > Michal Malý <[email protected]> writes: > > This mini series adds a simple skeleton module whose only purpose is to > > bring devices that at first appear as a generic USB device into another > > mode that can be handled by a more specific subsystem. > > > > This patch was originally requested by Dmitry, reasoning that loading the > > entire xpad module just to switch a Logitech G920 wheel into HID mode is > > excessive and does not make much sense. > > > > The module can be extended to handle any other USB device that might > > require such a switch. > > Can this switching be done in userspace? That's what we normally do, ref > usb_modeswitch.
I briefly considered leaving the switch up to the userspace and handling the device in the kernel only once it's been switched. I am however uncertain how to advertise this to the users. Writing a tiny app that would currently handle just one device seems like an overkill, abusing usb_modeswitch seems counter- intuitive as it's purpose is to handle various USB modems. Having a tiny module in the kernel looks like the most straightforward thing to do as far as user experience is concerned. I would not object to deferring the switch to userspace as long as there is an easy way how to communicate the need for a small switching tool to the users. Michal
