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-rw-r--r--docs/feature_ps2_mouse.md10
-rw-r--r--tmk_core/protocol/ps2_mouse.c7
2 files changed, 17 insertions, 0 deletions
diff --git a/docs/feature_ps2_mouse.md b/docs/feature_ps2_mouse.md
index 00c7ee72ee..776a33150e 100644
--- a/docs/feature_ps2_mouse.md
+++ b/docs/feature_ps2_mouse.md
@@ -270,6 +270,16 @@ Fine control over the scrolling is supported with the following defines:
#define PS2_MOUSE_SCROLL_DIVISOR_V 2
```
+### Invert Mouse buttons :id=invert-buttons
+
+To invert the left & right buttons you can put:
+
+```c
+#define PS2_MOUSE_INVERT_BUTTONS
+```
+
+into config.h.
+
### Invert Mouse and Scroll Axes :id=invert-mouse-and-scroll-axes
To invert the X and Y axes you can put:
diff --git a/tmk_core/protocol/ps2_mouse.c b/tmk_core/protocol/ps2_mouse.c
index 525aeb45a0..39251a6434 100644
--- a/tmk_core/protocol/ps2_mouse.c
+++ b/tmk_core/protocol/ps2_mouse.c
@@ -156,8 +156,15 @@ static inline void ps2_mouse_convert_report_to_hid(report_mouse_t *mouse_report)
mouse_report->x = X_IS_NEG ? ((!X_IS_OVF && -127 <= mouse_report->x && mouse_report->x <= -1) ? mouse_report->x : -127) : ((!X_IS_OVF && 0 <= mouse_report->x && mouse_report->x <= 127) ? mouse_report->x : 127);
mouse_report->y = Y_IS_NEG ? ((!Y_IS_OVF && -127 <= mouse_report->y && mouse_report->y <= -1) ? mouse_report->y : -127) : ((!Y_IS_OVF && 0 <= mouse_report->y && mouse_report->y <= 127) ? mouse_report->y : 127);
+#ifdef PS2_MOUSE_INVERT_BUTTONS
+ // swap left & right buttons
+ uint8_t needs_left = mouse_report->buttons & PS2_MOUSE_BTN_RIGHT;
+ uint8_t needs_right = mouse_report->buttons & PS2_MOUSE_BTN_LEFT;
+ mouse_report->buttons = (mouse_report->buttons & ~(PS2_MOUSE_BTN_MASK)) | (needs_left ? PS2_MOUSE_BTN_LEFT : 0) | (needs_right ? PS2_MOUSE_BTN_RIGHT : 0);
+#else
// remove sign and overflow flags
mouse_report->buttons &= PS2_MOUSE_BTN_MASK;
+#endif
#ifdef PS2_MOUSE_INVERT_X
mouse_report->x = -mouse_report->x;