[PATCH libevdev] tools: print the formula to calculate resolutions

[Peter Hutterer]

And encourage users to move at least 25cm, makes it a lot easier to pick the
resolution.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 tools/mouse-dpi-tool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/mouse-dpi-tool.c b/tools/mouse-dpi-tool.c
index 2bbaca5..411fed5 100644
--- a/tools/mouse-dpi-tool.c
+++ b/tools/mouse-dpi-tool.c
@@ -181,6 +181,9 @@ print_summary(struct measurements *m)
 		printf("%8dmm	%8.2fin	%8ddpi\n",
 		       (int)(inch * 25.4), inch, res);
 	}
+	printf("If your resolution is not in the list, calculate it with:\n"
+	       "\tresolution=units moved/inches, or\n"
+	       "\tresolution=units moved/(mm * 25.4)\n");
 }
 
 static inline const char*
@@ -236,7 +239,7 @@ main (int argc, char **argv) {
 	libevdev_grab(dev, LIBEVDEV_UNGRAB);
 
 	printf("Mouse %s on %s\n", libevdev_get_name(dev), path);
-	printf("Move the device along the x-axis.\n");
+	printf("Move the device 250mm/10in or more along the x-axis.\n");
 	printf("Pause 3 seconds before movement to reset, Ctrl+C to exit.\n");
 	setbuf(stdout, NULL);
 
-- 
2.1.0