virtio-input: core code & base class [device]

This patch adds virtio-input support to qemu.  It brings a abstract
base class providing core support, other classes can build on it to
actually implement input devices.

virtio-input basically sends linux input layer events (evdev) over
virtio.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

2 files changed, 85 insertions, 0 deletions

diff --git a/include/hw/virtio/virtio-input.h b/include/hw/virtio/virtio-input.h
new file mode 100644
index 0000000000..ad915cc7c1
--- /dev/null
+++ b/include/hw/virtio/virtio-input.h
@@ -0,0 +1,84 @@
+#ifndef _QEMU_VIRTIO_INPUT_H
+#define _QEMU_VIRTIO_INPUT_H
+
+#include "ui/input.h"
+
+/* ----------------------------------------------------------------- */
+/* virtio input protocol                                             */
+
+#include "standard-headers/linux/virtio_ids.h"
+#include "standard-headers/linux/virtio_input.h"
+
+typedef struct virtio_input_absinfo virtio_input_absinfo;
+typedef struct virtio_input_config virtio_input_config;
+typedef struct virtio_input_event virtio_input_event;
+
+#if defined(HOST_WORDS_BIGENDIAN)
+# define const_le32(_x) bswap32(_x)
+# define const_le16(_x) bswap32(_x)
+#else
+# define const_le32(_x) (_x)
+# define const_le16(_x) (_x)
+#endif
+
+/* ----------------------------------------------------------------- */
+/* qemu internals                                                    */
+
+#define TYPE_VIRTIO_INPUT "virtio-input-device"
+#define VIRTIO_INPUT(obj) \
+        OBJECT_CHECK(VirtIOInput, (obj), TYPE_VIRTIO_INPUT)
+#define VIRTIO_INPUT_GET_PARENT_CLASS(obj) \
+        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT)
+#define VIRTIO_INPUT_GET_CLASS(obj) \
+        OBJECT_GET_CLASS(VirtIOInputClass, obj, TYPE_VIRTIO_INPUT)
+#define VIRTIO_INPUT_CLASS(klass) \
+        OBJECT_CLASS_CHECK(VirtIOInputClass, klass, TYPE_VIRTIO_INPUT)
+
+typedef struct VirtIOInput VirtIOInput;
+typedef struct VirtIOInputClass VirtIOInputClass;
+typedef struct VirtIOInputConfig VirtIOInputConfig;
+
+struct virtio_input_conf {
+    char *serial;
+};
+
+struct VirtIOInputConfig {
+    virtio_input_config               config;
+    QTAILQ_ENTRY(VirtIOInputConfig)   node;
+};
+
+struct VirtIOInput {
+    VirtIODevice                      parent_obj;
+    uint8_t                           cfg_select;
+    uint8_t                           cfg_subsel;
+    uint32_t                          cfg_size;
+    QTAILQ_HEAD(, VirtIOInputConfig)  cfg_list;
+    VirtQueue                         *evt, *sts;
+    virtio_input_conf                 input;
+
+    virtio_input_event                *queue;
+    uint32_t                          qindex, qsize;
+
+    bool                              active;
+};
+
+struct VirtIOInputClass {
+    /*< private >*/
+    VirtioDeviceClass parent;
+    /*< public >*/
+
+    DeviceRealize realize;
+    DeviceUnrealize unrealize;
+    void (*change_active)(VirtIOInput *vinput);
+    void (*handle_status)(VirtIOInput *vinput, virtio_input_event *event);
+};
+
+void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event);
+void virtio_input_init_config(VirtIOInput *vinput,
+                              virtio_input_config *config);
+void virtio_input_add_config(VirtIOInput *vinput,
+                             virtio_input_config *config);
+void virtio_input_idstr_config(VirtIOInput *vinput,
+                               uint8_t select, const char *string);
+
+#endif /* _QEMU_VIRTIO_INPUT_H */
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 8210cb34f9..ba74765d0b 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -188,6 +188,7 @@ int virtio_set_features(VirtIODevice *vdev, uint32_t val);
 typedef struct VirtIOBlkConf VirtIOBlkConf;
 struct virtio_net_conf;
 typedef struct virtio_serial_conf virtio_serial_conf;
+typedef struct virtio_input_conf virtio_input_conf;
 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 typedef struct VirtIORNGConf VirtIORNGConf;