Re: [Qemu-devel] [PATCH v2] usb: Remove legacy -usbdevice option

[Samuel Thibault]

Paolo Bonzini, on jeu. 04 janv. 2018 18:57:18 +0100, wrote:
> On 04/01/2018 18:45, Samuel Thibault wrote:
> > Paolo Bonzini, on jeu. 04 janv. 2018 18:11:00 +0100, wrote:
> >> On 04/01/2018 16:56, Samuel Thibault wrote:
> >>>> However, adding magic to "-device usb-braille" that creates both a
> >>>> front-end and a back-end is completely the opposite of sane...
> >>> Well, this is also what happens with -device usb-mouse, usb-kbd etc.:
> >>> they also plug with keyboard & mouse pipes of the qemu graphical
> >>> frontend. braille is just the same vein for the user.
> >>
> >> No, they don't create a new UI object magically that wasn't there
> >> before.  They just let you add a device, e.g. a USB tablet, that listens
> >> on an _existing_ UI (GTK+ or SDL or similar).
> > 
> > Technically for the qemu developper, yes.
> > 
> > But for the user, no.
> 
> That's not true.   With or without "-usbdevice tablet", you use the same
> mouse or keyboard device as the input source.

Yes, because it preexists in the mind of the user. That's the same for
braille. The fact that braille has to go through a character-to-brlapi
conversion is not the business of the user, he just wants braille out.

Samuel