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HID: wacom: Avoid sending empty sync events
Empty sync events clutter up logs and are a waste of CPU cycles. We can avoid sending mt_sync events if touch is disabled or a specific slot is unused. We can avoid sending full sync events if no events were generated. Signed-off-by: Ping Cheng <ping.cheng@wacom.com> Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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1 changed files with 14 additions and 1 deletions
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@ -2551,8 +2551,17 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac,
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int slot;
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slot = input_mt_get_slot_by_key(input, hid_data->id);
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if (slot < 0)
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if (slot < 0) {
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return;
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} else {
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struct input_mt_slot *ps = &input->mt->slots[slot];
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int mt_id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
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if (!prox && mt_id < 0) {
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// No data to send for this slot; short-circuit
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return;
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}
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}
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input_mt_slot(input, slot);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, prox);
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@ -2696,6 +2705,10 @@ static void wacom_wac_finger_report(struct hid_device *hdev,
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struct input_dev *input = wacom_wac->touch_input;
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unsigned touch_max = wacom_wac->features.touch_max;
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/* if there was nothing to process, don't send an empty sync */
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if (wacom_wac->hid_data.num_expected == 0)
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return;
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/* If more packets of data are expected, give us a chance to
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* process them rather than immediately syncing a partial
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* update.
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