- counter->remainder += hi_res_value;
- if (abs(counter->remainder) >= threshold) {
- /* Add (or subtract) 1 because we want to trigger when the wheel
- * is half-way to the next notch (i.e. scroll 1 notch after a
- * 1/2 notch movement, 2 notches after a 1 1/2 notch movement,
- * etc.).
- */
- low_res_scroll_amount =
- counter->remainder / counter->resolution_multiplier
- + (hi_res_value > 0 ? 1 : -1);
- input_report_rel(counter->dev, REL_WHEEL,
- low_res_scroll_amount);
- counter->remainder -=
- low_res_scroll_amount * counter->resolution_multiplier;
- }
+ /*
+ * Update the low-res remainder with the high-res value,
+ * but reset if the direction has changed.
+ */
+ remainder = counter->remainder;
+ if ((remainder ^ hi_res_value) < 0)
+ remainder = 0;
+ remainder += hi_res_value;
+
+ /*
+ * Then just use the resolution multiplier to see if
+ * we should send a low-res (aka regular wheel) event.
+ */
+ multiplier = counter->resolution_multiplier;
+ low_res_value = remainder / multiplier;
+ remainder -= low_res_value * multiplier;
+ counter->remainder = remainder;
+
+ if (low_res_value)
+ input_report_rel(counter->dev, REL_WHEEL, low_res_value);