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-rw-r--r--qemu/backends/msmouse.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/qemu/backends/msmouse.c b/qemu/backends/msmouse.c
new file mode 100644
index 000000000..0119110a4
--- /dev/null
+++ b/qemu/backends/msmouse.c
@@ -0,0 +1,85 @@
+/*
+ * QEMU Microsoft serial mouse emulation
+ *
+ * Copyright (c) 2008 Lubomir Rintel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include "qemu-common.h"
+#include "sysemu/char.h"
+#include "ui/console.h"
+
+#define MSMOUSE_LO6(n) ((n) & 0x3f)
+#define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
+
+static void msmouse_event(void *opaque,
+ int dx, int dy, int dz, int buttons_state)
+{
+ CharDriverState *chr = (CharDriverState *)opaque;
+
+ unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
+
+ /* Movement deltas */
+ bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
+ bytes[1] |= MSMOUSE_LO6(dx);
+ bytes[2] |= MSMOUSE_LO6(dy);
+
+ /* Buttons */
+ bytes[0] |= (buttons_state & 0x01 ? 0x20 : 0x00);
+ bytes[0] |= (buttons_state & 0x02 ? 0x10 : 0x00);
+ bytes[3] |= (buttons_state & 0x04 ? 0x20 : 0x00);
+
+ /* We always send the packet of, so that we do not have to keep track
+ of previous state of the middle button. This can potentially confuse
+ some very old drivers for two button mice though. */
+ qemu_chr_be_write(chr, bytes, 4);
+}
+
+static int msmouse_chr_write (struct CharDriverState *s, const uint8_t *buf, int len)
+{
+ /* Ignore writes to mouse port */
+ return len;
+}
+
+static void msmouse_chr_close (struct CharDriverState *chr)
+{
+ g_free (chr);
+}
+
+CharDriverState *qemu_chr_open_msmouse(void)
+{
+ CharDriverState *chr;
+
+ chr = qemu_chr_alloc();
+ chr->chr_write = msmouse_chr_write;
+ chr->chr_close = msmouse_chr_close;
+ chr->explicit_be_open = true;
+
+ qemu_add_mouse_event_handler(msmouse_event, chr, 0, "QEMU Microsoft Mouse");
+
+ return chr;
+}
+
+static void register_types(void)
+{
+ register_char_driver("msmouse", CHARDEV_BACKEND_KIND_MSMOUSE, NULL);
+}
+
+type_init(register_types);