Add PS2_MOUSE_ROTATE to compensate for device orientation (#8650)

* Add PS2_MOUSE_ROTATE to compensate for device orientation

* fixup! Add PS2_MOUSE_ROTATE to compensate for device orientation

* Reformat with IndentPPDirectives: AfterHash as per #6316

1 files changed, 19 insertions, 0 deletions

diff --git a/docs/feature_ps2_mouse.md b/docs/feature_ps2_mouse.md
index ce072fbe9..c1bd8bff5 100644
--- a/docs/feature_ps2_mouse.md
+++ b/docs/feature_ps2_mouse.md
@@ -266,6 +266,25 @@ To reverse the scroll axes you can put:
 
 into config.h.
 
+### Rotate Mouse Axes :id=rotate-mouse-axes
+
+Transform the output of the device with a clockwise rotation of 90, 180, or 270
+degrees.
+
+When compensating for device orientation, rotate the output the same amount in
+the opposite direction.  E.g. if the normal device orientation is considered to
+be North-facing, compensate as follows:
+
+```c
+#define PS2_MOUSE_ROTATE 270 /* Compensate for East-facing device orientation. */
+```
+```c
+#define PS2_MOUSE_ROTATE 180 /* Compensate for South-facing device orientation. */
+```
+```c
+#define PS2_MOUSE_ROTATE 90 /* Compensate for West-facing device orientation. */
+```
+
 ### Debug Settings :id=debug-settings
 
 To debug the mouse, add `debug_mouse = true` or enable via bootmagic.