Add movement hook to ps2_mouse (#8805)

Process mouse movement in the keymap before it is sent to the host. Example uses
include filtering noise, adding acceleration, and automatically activating a
layer. To use, define the following function in your keymap:

void ps2_mouse_moved_user(report_mouse_t *mouse_report);

2 files changed, 8 insertions, 0 deletions

diff --git a/tmk_core/protocol/ps2_mouse.c b/tmk_core/protocol/ps2_mouse.c
index a0e52bc7c..8df465026 100644
--- a/tmk_core/protocol/ps2_mouse.c
+++ b/tmk_core/protocol/ps2_mouse.c
@@ -68,6 +68,8 @@ void ps2_mouse_init(void) {
 
 __attribute__((weak)) void ps2_mouse_init_user(void) {}
 
+__attribute__((weak)) void ps2_mouse_moved_user(report_mouse_t *mouse_report) {}
+
 void ps2_mouse_task(void) {
     static uint8_t buttons_prev = 0;
     extern int     tp_buttons;
@@ -98,6 +100,9 @@ void ps2_mouse_task(void) {
 #if PS2_MOUSE_SCROLL_BTN_MASK
         ps2_mouse_scroll_button_task(&mouse_report);
 #endif
+        if (mouse_report.x || mouse_report.y || mouse_report.v) {
+            ps2_mouse_moved_user(&mouse_report);
+        }
 #ifdef PS2_MOUSE_DEBUG_HID
         // Used to debug the bytes sent to the host
         ps2_mouse_print_report(&mouse_report);
diff --git a/tmk_core/protocol/ps2_mouse.h b/tmk_core/protocol/ps2_mouse.h
index 30053ef18..d743fb3d8 100644
--- a/tmk_core/protocol/ps2_mouse.h
+++ b/tmk_core/protocol/ps2_mouse.h
@@ -20,6 +20,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <stdbool.h>
 #include "debug.h"
+#include "report.h"
 
 #define PS2_MOUSE_SEND(command, message)                                                \
     do {                                                                                \
@@ -174,4 +175,6 @@ void ps2_mouse_set_resolution(ps2_mouse_resolution_t resolution);
 
 void ps2_mouse_set_sample_rate(ps2_mouse_sample_rate_t sample_rate);
 
+void ps2_mouse_moved_user(report_mouse_t *mouse_report);
+
 #endif