Re: [Xen-devel] [PATCH] kbdif: Define "feature-raw-pointer" and "request-raw-pointer"

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 3 Jul 2017, Stefano Stabellini wrote:
> On Mon, 3 Jul 2017, Owen Smith wrote:
> > Backends set "feature-raw-pointer" if its capable of reporting
> > absolute positions without scaling the coordinates to screen
> > size. This should be set during the backend init.
> > Frontends set "request-raw-pointer" to request that backends
> > do not rescale absolute coordinates to screen size, and the
> > coordinates remain in the range [0, 0x7fff]. This request is
> > only applicable if "request-abs-pointer" is also set. Frontends
> > should set this value before setting Connected.
> > 
> > Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
> 
> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

Konrad, are you OK with this? Can I go ahead and commit it?


> 
> > ---
> > Adding this feature will help determine the difference between older
> > backends and newer backends. In the case I'm interested in, the difference
> > between old QEMU vkbd backend which blocks waiting for the vfb device, which
> > is not present on HVM guests, and a newer QEMU backend that does not rely
> > on display information to rescale axis values.
> > 
> >  xen/include/public/io/kbdif.h | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> > 
> > diff --git a/xen/include/public/io/kbdif.h b/xen/include/public/io/kbdif.h
> > index dcbd71a..3ce54e9 100644
> > --- a/xen/include/public/io/kbdif.h
> > +++ b/xen/include/public/io/kbdif.h
> > @@ -63,6 +63,13 @@
> >   *      Backends, which support reporting of multi-touch events
> >   *      should set this to 1.
> >   *
> > + * feature-raw-pointer
> > + *      Values:        <uint>
> > + *
> > + *      Backends, which support reporting raw (unscaled) absolute 
> > coordinates
> > + *      for pointer devices should set this to 1. Raw (unscaled) values 
> > have
> > + *      a range of [0, 0x7fff].
> > + *
> >   *------------------------- Pointer Device Parameters 
> > ------------------------
> >   *
> >   * width
> > @@ -98,6 +105,13 @@
> >   *
> >   *      Request backend to report multi-touch events.
> >   *
> > + * request-raw-pointer
> > + *      Values:         <uint>
> > + *
> > + *      Request backend to report raw unscaled absolute pointer 
> > coordinates.
> > + *      This option is only valid if request-abs-pointer is also set.
> > + *      Raw unscaled coordinates have the range [0, 0x7fff]
> > + *
> >   *----------------------- Request Transport Parameters 
> > -----------------------
> >   *
> >   * event-channel
> > -- 
> > 2.1.4
> > 
> 

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