Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 102 insertions, 0 deletions

diff --git a/include/ui/kbd-state.h b/include/ui/kbd-state.h
new file mode 100644
index 000000000..eb9067dd5
--- /dev/null
+++ b/include/ui/kbd-state.h
@@ -0,0 +1,102 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+
+#ifndef QEMU_UI_KBD_STATE_H
+#define QEMU_UI_KBD_STATE_H
+
+#include "qapi/qapi-types-ui.h"
+
+typedef enum QKbdModifier QKbdModifier;
+
+enum QKbdModifier {
+    QKBD_MOD_NONE = 0,
+
+    QKBD_MOD_SHIFT,
+    QKBD_MOD_CTRL,
+    QKBD_MOD_ALT,
+    QKBD_MOD_ALTGR,
+
+    QKBD_MOD_NUMLOCK,
+    QKBD_MOD_CAPSLOCK,
+
+    QKBD_MOD__MAX
+};
+
+typedef struct QKbdState QKbdState;
+
+/**
+ * qkbd_state_init: init keyboard state tracker.
+ *
+ * Allocates and initializes keyboard state struct.
+ *
+ * @con: QemuConsole for this state tracker.  Gets passed down to
+ * qemu_input_*() functions when sending key events to the guest.
+ */
+QKbdState *qkbd_state_init(QemuConsole *con);
+
+/**
+ * qkbd_state_free: free keyboard tracker state.
+ *
+ * @kbd: state tracker state.
+ */
+void qkbd_state_free(QKbdState *kbd);
+
+/**
+ * qkbd_state_key_event: process key event.
+ *
+ * Update keyboard state, send event to the guest.
+ *
+ * This function takes care to not send suspious events (keyup event
+ * for a key not pressed for example).
+ *
+ * @kbd: state tracker state.
+ * @qcode: the key pressed or released.
+ * @down: true for key down events, false otherwise.
+ */
+void qkbd_state_key_event(QKbdState *kbd, QKeyCode qcode, bool down);
+
+/**
+ * qkbd_state_set_delay: set key press delay.
+ *
+ * When set the specified delay will be added after each key event,
+ * using qemu_input_event_send_key_delay().
+ *
+ * @kbd: state tracker state.
+ * @delay_ms: the delay in miliseconds.
+ */
+void qkbd_state_set_delay(QKbdState *kbd, int delay_ms);
+
+/**
+ * qkbd_state_key_get: get key state.
+ *
+ * Returns true when the key is down.
+ *
+ * @kbd: state tracker state.
+ * @qcode: the key to query.
+ */
+bool qkbd_state_key_get(QKbdState *kbd, QKeyCode qcode);
+
+/**
+ * qkbd_state_modifier_get: get modifier state.
+ *
+ * Returns true when the modifier is active.
+ *
+ * @kbd: state tracker state.
+ * @mod: the modifier to query.
+ */
+bool qkbd_state_modifier_get(QKbdState *kbd, QKbdModifier mod);
+
+/**
+ * qkbd_state_lift_all_keys: lift all pressed keys.
+ *
+ * This sends key up events to the guest for all keys which are in
+ * down state.
+ *
+ * @kbd: state tracker state.
+ */
+void qkbd_state_lift_all_keys(QKbdState *kbd);
+
+#endif /* QEMU_UI_KBD_STATE_H */