[Xen-devel] [PATCH] kbdif.h: Introduce feature-vkbd-standalone

[Owen Smith <owen.smith@xxxxxxxxxx>]

Backends set "feature-vkbd-standalone" to 1 if they can connect
without waiting for the PV framebuffer. If this value is missing
or not 1, then a backend will wait for the PV framebuffer before
connecting, potentially causing the frontend to wait indefinitely.

Frontends set "request-vkbd-standalone" to 1 to request that the
backend does not wait for the PV framebuffer. Frontends that
require a standalone vkbd device should not attempt to connect
unless the backend advertises "feature-vkbd-standalone", and
should set "request-vkbd-standalone".

Backends that are standalone (i.e. do not have an associated PV
framebuffer) do not rescale absolute mouse or touch coordinates
to a the size of the (non-existant) PV framebuffer, and use the
range of [0, 0x7fff] for absolute values.

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
---
 xen/include/public/io/kbdif.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/xen/include/public/io/kbdif.h b/xen/include/public/io/kbdif.h
index dcbd71a..ca09080 100644
--- a/xen/include/public/io/kbdif.h
+++ b/xen/include/public/io/kbdif.h
@@ -63,6 +63,12 @@
  *      Backends, which support reporting of multi-touch events
  *      should set this to 1.
  *
+ * feature-vkbd-standalone
+ *      Values:         <uint>
+ *
+ *      Backends, which support a standalone vkbd, without requiring a vfb
+ *      device, should set this to 1.
+ *
  *------------------------- Pointer Device Parameters ------------------------
  *
  * width
@@ -98,6 +104,13 @@
  *
  *      Request backend to report multi-touch events.
  *
+ * request-vkbd-standalone
+ *      Values:         <uint>
+ *
+ *      Request backend to connect vkbd device without waiting for the
+ *      vfb device. Any absolute coordinates will NOT be scaled to
+ *      screen size, and will remain in the range [0, 0x7fff]
+ *
  *----------------------- Request Transport Parameters -----------------------
  *
  * event-channel
@@ -165,8 +178,10 @@
 
 #define XENKBD_FIELD_FEAT_ABS_POINTER  "feature-abs-pointer"
 #define XENKBD_FIELD_FEAT_MTOUCH       "feature-multi-touch"
+#define XENKBD_FIELD_FEAT_STANDALONE   "feature-vkbd-standalone"
 #define XENKBD_FIELD_REQ_ABS_POINTER   "request-abs-pointer"
 #define XENKBD_FIELD_REQ_MTOUCH        "request-multi-touch"
+#define XENKBD_FIELD_REQ_STANDALONE    "request-vkbd-standalone"
 #define XENKBD_FIELD_RING_GREF         "page-gref"
 #define XENKBD_FIELD_EVT_CHANNEL       "event-channel"
 #define XENKBD_FIELD_WIDTH             "width"
-- 
2.1.4


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