From f08d5e7c09879889797ebf0eb2de562dac111737 Mon Sep 17 00:00:00 2001
From: Daniel Kao <daniel.m.kao@gmail.com>
Date: Sun, 3 Jul 2022 18:27:55 -0700
Subject: [PATCH] pointing device gestures: div0 checks

---
 drivers/sensors/cirque_pinnacle_gestures.c | 10 ++++++++--
 quantum/pointing_device_gestures.c         | 10 ++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/sensors/cirque_pinnacle_gestures.c b/drivers/sensors/cirque_pinnacle_gestures.c
index b1042079df34..7182fa2b97af 100644
--- a/drivers/sensors/cirque_pinnacle_gestures.c
+++ b/drivers/sensors/cirque_pinnacle_gestures.c
@@ -83,12 +83,18 @@ static circular_scroll_t circular_scroll(pinnacle_data_t touchData) {
     int8_t            x, y, wheel_clicks;
     uint8_t           center = 256 / 2, mag;
     int16_t           ang, dot, det, opposite_side, adjacent_side;
+    uint16_t          scale = cirque_pinnacle_get_scale();
 
     if (touchData.zValue) {
         // place origin at center of trackpad, treat coordinates as vectors
         // scale to fixed int8_t size, angles are independent of resolution
-        x = (int8_t)((int32_t)touchData.xValue * 256 / cirque_pinnacle_get_scale() - center);
-        y = (int8_t)((int32_t)touchData.yValue * 256 / cirque_pinnacle_get_scale() - center);
+        if (scale) {
+            x = (int8_t)((int32_t)touchData.xValue * 256 / scale - center);
+            y = (int8_t)((int32_t)touchData.yValue * 256 / scale - center);
+        } else {
+            x = 0;
+            y = 0;
+        }
 
         // check if first touch
         if (!scroll.z) {
diff --git a/quantum/pointing_device_gestures.c b/quantum/pointing_device_gestures.c
index 7f0eecced929..78ed63b57523 100644
--- a/quantum/pointing_device_gestures.c
+++ b/quantum/pointing_device_gestures.c
@@ -26,6 +26,15 @@ static cursor_glide_t cursor_glide(cursor_glide_context_t* glide) {
     int32_t        p;
     int32_t        x, y;
 
+    if (glide->v0 == 0) {
+        report.dx    = 0;
+        report.dy    = 0;
+        report.valid = false;
+        glide->dx0   = 0;
+        glide->dy0   = 0;
+        goto exit;
+    }
+
     glide->counter++;
     // calculate current 1D position
     p = glide->v0 * glide->counter - (int32_t)glide->coef * glide->counter * glide->counter / 2;
@@ -44,6 +53,7 @@ static cursor_glide_t cursor_glide(cursor_glide_context_t* glide) {
     glide->y     = y;
     glide->timer = timer_read();
 
+exit:
     return report;
 }