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evdev: Avoid double touch down/up events

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When the kernel sends multiple touch down or touch up for the same slot
in a row, ignore any such subsequent event ensuring libinput always
produces 1 x touch down -> [n x touch motion] -> 1 x touch up event
series.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Jonas Ådahl 2014-03-24 23:37:09 +01:00
parent 086c591675
commit cf2d61439e
1 changed files with 15 additions and 0 deletions
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15
src/evdev.c
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@ -132,6 +132,12 @@ evdev_flush_pending_event(struct evdev_device *device, uint32_t time)
if (!(device->seat_caps & EVDEV_DEVICE_TOUCH))
break;
if (device->mt.slots[slot].seat_slot != -1) {
log_bug("%s: Driver sent multiple touch down for the "
"same slot", device->devnode);
break;
}
seat_slot = ffs(~seat->slot_map) - 1;
device->mt.slots[slot].seat_slot = seat_slot;
@ -162,6 +168,7 @@ evdev_flush_pending_event(struct evdev_device *device, uint32_t time)
break;
seat_slot = device->mt.slots[slot].seat_slot;
device->mt.slots[slot].seat_slot = -1;
if (seat_slot == -1)
break;
@ -174,6 +181,12 @@ evdev_flush_pending_event(struct evdev_device *device, uint32_t time)
if (!(device->seat_caps & EVDEV_DEVICE_TOUCH))
break;
if (device->abs.seat_slot != -1) {
log_bug("%s: Driver sent multiple touch down for the "
"same slot", device->devnode);
break;
}
seat_slot = ffs(~seat->slot_map) - 1;
device->abs.seat_slot = seat_slot;
@ -209,6 +222,7 @@ evdev_flush_pending_event(struct evdev_device *device, uint32_t time)
break;
seat_slot = device->abs.seat_slot;
device->abs.seat_slot = -1;
if (seat_slot == -1)
break;
@ -711,6 +725,7 @@ evdev_device_create(struct libinput_seat *seat,
device->sysname = strdup(sysname);
device->rel.dx = 0;
device->rel.dy = 0;
device->abs.seat_slot = -1;
device->dispatch = NULL;
device->fd = fd;
device->pending_event = EVDEV_NONE;