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

[Owen Smith <owen.smith@xxxxxxxxxx>]

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>
---
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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel