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

[Thomas Huth]

On 04.01.2018 14:26, Samuel Thibault wrote:
> Hello,
> 
> I'm afraid I can't even work out how to replace -usbdevice braille (or
> -usbdevice serial, all questions below apply, except making chardev
> default to braille):
> 
> ... -usbdevice braille
> 
> -usbdevice braille: '-usbdevice' is deprecated, please use '-device usb-...' 
> instead
> 
> but -device usb-serial is not actually documented in the manual page
> (same for usb-keyboard, usb-tablet, etc. for instance I can't find in
> the manpage anything about replacement for -usbdevice host:nnnn:nnnn)

As mentioned in my other mail, it's in the qemu-doc here:

https://qemu.weilnetz.de/doc/qemu-doc.html#usb_005fdevices

> But then
> 
> ... -usb -device usb-braille
> 
> -device usb-braille: Property chardev is required
> 
> that used to be a default, could we keep it a default when using
> -device?  Hardly anybody would want to use usb-braille with something
> else than chardev braille.

I think it's more common to not do any magic default setup with
"-device", but if you think this should be the case here, it can
certainly be added again (not with this patch here, though, since this
is a separate issue).

> ... -usb -device usb-braille,chardev=braille
> 
> -device usb-serial,chardev=braille: Property 'usb-serial.chardev' can't find 
> value 'braille'
> 
> Uh?  It seems there is a parsing issue here?

Chardevs have to be specified with the "-chardev" parameter:

... -usb -device usb-braille,chardev=br0 -chardev braille,id=br0

 HTH,
  Thomas