input: Add a command to show mouse input

This reads mouse input and shows it on the terminal. It is useful for
testing mice.

Change-Id: Ifebe6452f38904689e3e2142fc08a623131ed0de
Signed-off-by: Simon Glass <sjg@chromium.org>

cmd/mouse.c

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Mouse testing
+ *
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <command.h>
+#include <console.h>
+#include <dm.h>
+#include <mouse.h>
+#include <u-boot/schedule.h>
+
+static int do_mouse_dump(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	struct udevice *dev;
+	bool running;
+	int count;
+	int ret;
+
+	ret = uclass_first_device_err(UCLASS_MOUSE, &dev);
+	if (ret) {
+		printf("Mouse not found (err=%d)\n", ret);
+		return CMD_RET_FAILURE;
+	}
+	for (running = true, count = 0; running;) {
+		struct mouse_event evt;
+
+		ret = mouse_get_event(dev, &evt);
+		if (!ret) {
+			switch (evt.type) {
+			case MOUSE_EV_BUTTON: {
+				struct mouse_button *but = &evt.button;
+
+				printf("button: button==%d, press=%d, clicks=%d, X=%d, Y=%d\n",
+				       but->button, but->press_state,
+				       but->clicks, but->x, but->y);
+				break;
+			}
+			case MOUSE_EV_MOTION: {
+				struct mouse_motion *motion = &evt.motion;
+				printf("motion: Xrel=%d, Yrel=%d, X=%d, Y=%d, but=%d\n",
+				       motion->xrel, motion->yrel, motion->x,
+				       motion->y, motion->state);
+				break;
+			}
+			case MOUSE_EV_NULL:
+				break;
+			}
+			count++;
+		} else if (ret != -EAGAIN) {
+			return log_msg_ret("get_event", ret);
+		}
+		schedule();
+		if (ctrlc())
+			running = false;
+	}
+	printf("%d events received\n", count);
+
+	return 0;
+}
+
+static char mouse_help_text[] =
+	"dump - Dump input from a mouse";
+
+U_BOOT_CMD_WITH_SUBCMDS(mouse, "Mouse input", mouse_help_text,
+	U_BOOT_SUBCMD_MKENT(dump, 1, 1, do_mouse_dump));