HID: multitouch: add MT_QUIRK_IGNORE_DUPLICATES
This quirk allows a device to reuse a contact id when sending garbage
inactive contacts at the end of a report.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index ffdbc70..e86fbf4 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -52,6 +52,7 @@
#define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 6)
#define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8)
#define MT_QUIRK_NO_AREA (1 << 9)
+#define MT_QUIRK_IGNORE_DUPLICATES (1 << 10)
struct mt_slot {
__s32 x, y, cx, cy, p, w, h;
@@ -505,10 +506,18 @@
if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
int slotnum = mt_compute_slot(td, input);
struct mt_slot *s = &td->curdata;
+ struct input_mt *mt = input->mt;
if (slotnum < 0 || slotnum >= td->maxcontacts)
return;
+ if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
+ struct input_mt_slot *slot = &mt->slots[slotnum];
+ if (input_mt_is_active(slot) &&
+ input_mt_is_used(mt, slot))
+ return;
+ }
+
input_mt_slot(input, slotnum);
input_mt_report_slot_state(input, MT_TOOL_FINGER,
s->touch_state);