int slot;
slot = input_mt_get_slot_by_key(input, hid_data->id);
- if (slot < 0)
+ if (slot < 0) {
return;
+ } else {
+ struct input_mt_slot *ps = &input->mt->slots[slot];
+ int mt_id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
+
+ if (!prox && mt_id < 0) {
+ // No data to send for this slot; short-circuit
+ return;
+ }
+ }
input_mt_slot(input, slot);
input_mt_report_slot_state(input, MT_TOOL_FINGER, prox);
struct input_dev *input = wacom_wac->touch_input;
unsigned touch_max = wacom_wac->features.touch_max;
+ /* if there was nothing to process, don't send an empty sync */
+ if (wacom_wac->hid_data.num_expected == 0)
+ return;
+
/* If more packets of data are expected, give us a chance to
* process them rather than immediately syncing a partial
* update.