input: sandbox: Provide a mouse driver

Add a sandbox driver for the mouse, so it can be used as an input
device.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/input/Kconfig

@@ -103,6 +103,7 @@ config TWL4030_INPUT
 
 config MOUSE
 	bool "Support for mice and other pointing devices"
+	depends on INPUT
 	default y if SANDBOX
 	help
 	  This allows U-Boot to access mouse input, typically needed for

drivers/input/Makefile

@@ -17,3 +17,6 @@ obj-$(CONFIG_TWL4030_INPUT) += twl4030.o
 endif
 
 obj-$(CONFIG_MOUSE) += mouse-uclass.o
+ifdef CONFIG_MOUSE
+obj-$(CONFIG_SANDBOX) += sandbox_mouse.o
+endif

drivers/input/sandbox_mouse.c

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <dm.h>
+#include <mouse.h>
+#include <asm/sdl.h>
+
+static int mouse_sandbox_get_event(struct udevice *dev,
+				   struct mouse_event *event)
+{
+	int ret;
+
+	ret = sandbox_sdl_get_mouse_event(event);
+
+	return ret;
+}
+
+const struct mouse_ops mouse_sandbox_ops = {
+	.get_event	= mouse_sandbox_get_event,
+};
+
+static const struct udevice_id mouse_sandbox_ids[] = {
+	{ .compatible = "sandbox,mouse" },
+	{ }
+};
+
+U_BOOT_DRIVER(mouse_sandbox) = {
+	.name	= "mouse_sandbox",
+	.id	= UCLASS_MOUSE,
+	.of_match = mouse_sandbox_ids,
+	.ops	= &mouse_sandbox_ops,
+};