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authorPeter Hutterer <peter.hutterer@who-t.net>2016-03-07 16:05:25 +1000
committerPeter Hutterer <peter.hutterer@who-t.net>2016-03-11 10:02:26 +1000
commita608d9dc2c70c7915fc94466ed27c1684f65409e (patch)
tree72330e679e6f893e402523ebd158a40c9abd52f5 /src
parent5d904b63191538b46d7fe8443990b55c42de0205 (diff)
touchpad: add quirk for the T450 and T460 generation hardware
The touchpad's sensors are too far apart (or the firmware interferes), causing in a jerky movement visible especially on slow motion. We get a bunch of normal motion events, then only ABS_MT_PRESSURE updates without x/y updates. After about one mm of movement x/y updates resume, with the first event covering the distance between the last motion event. That event is usually accelerated and thus causes a large jump. Subsequent events are sufficiently fine-grained again. This patch counts the number of non-motion events. Once we hit 10 in a row, we mark the first motion update as non-dirty, effectively discarding the motion and thus stopping the pointer jumps. https://bugs.freedesktop.org/show_bug.cgi?id=94379 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Tested-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/evdev-mt-touchpad.c32
-rw-r--r--src/evdev-mt-touchpad.h12
-rw-r--r--src/evdev.c1
-rw-r--r--src/evdev.h1
4 files changed, 42 insertions, 4 deletions
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 00d65396..d0a8e27c 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -337,7 +337,7 @@ tp_process_absolute(struct tp_dispatch *tp,
case ABS_MT_PRESSURE:
t->pressure = e->value;
t->dirty = true;
- tp->queued |= TOUCHPAD_EVENT_MOTION;
+ tp->queued |= TOUCHPAD_EVENT_OTHERAXIS;
break;
}
}
@@ -880,8 +880,10 @@ tp_position_fake_touches(struct tp_dispatch *tp)
}
static inline bool
-tp_need_motion_history_reset(struct tp_dispatch *tp)
+tp_need_motion_history_reset(struct tp_dispatch *tp, uint64_t time)
{
+ bool rc = false;
+
/* semi-mt finger postions may "jump" when nfingers changes */
if (tp->semi_mt && tp->nfingers_down != tp->old_nfingers_down)
return true;
@@ -894,7 +896,29 @@ tp_need_motion_history_reset(struct tp_dispatch *tp)
tp->old_nfingers_down > tp->num_slots))
return true;
- return false;
+ /* Quirk: if we had multiple events without x/y axis
+ information, the next x/y event is going to be a jump. So we
+ reset that touch to non-dirty effectively swallowing that event
+ and restarting with the next event again.
+ */
+ if (tp->device->model_flags & EVDEV_MODEL_LENOVO_T450_TOUCHPAD) {
+ if (tp->queued & TOUCHPAD_EVENT_MOTION) {
+ if (tp->quirks.nonmotion_event_count > 10) {
+ struct tp_touch *t;
+
+ tp_for_each_touch(tp, t)
+ t->dirty = false;
+ rc = true;
+ }
+ tp->quirks.nonmotion_event_count = 0;
+ }
+
+ if ((tp->queued & (TOUCHPAD_EVENT_OTHERAXIS|TOUCHPAD_EVENT_MOTION)) ==
+ TOUCHPAD_EVENT_OTHERAXIS)
+ tp->quirks.nonmotion_event_count++;
+ }
+
+ return rc;
}
static void
@@ -909,7 +933,7 @@ tp_process_state(struct tp_dispatch *tp, uint64_t time)
tp_unhover_touches(tp, time);
tp_position_fake_touches(tp);
- want_motion_reset = tp_need_motion_history_reset(tp);
+ want_motion_reset = tp_need_motion_history_reset(tp, time);
for (i = 0; i < tp->ntouches; i++) {
t = tp_get_touch(tp, i);
diff --git a/src/evdev-mt-touchpad.h b/src/evdev-mt-touchpad.h
index eae327bf..1f05a03e 100644
--- a/src/evdev-mt-touchpad.h
+++ b/src/evdev-mt-touchpad.h
@@ -41,6 +41,7 @@ enum touchpad_event {
TOUCHPAD_EVENT_MOTION = (1 << 0),
TOUCHPAD_EVENT_BUTTON_PRESS = (1 << 1),
TOUCHPAD_EVENT_BUTTON_RELEASE = (1 << 2),
+ TOUCHPAD_EVENT_OTHERAXIS = (1 << 3),
};
enum touchpad_model {
@@ -353,6 +354,17 @@ struct tp_dispatch {
int upper_thumb_line;
int lower_thumb_line;
} thumb;
+
+ struct {
+ /* A quirk used on the T450 series Synaptics hardware.
+ * Slowly moving the finger causes multiple events with only
+ * ABS_MT_PRESSURE but no x/y information. When the x/y
+ * event comes, it will be a jump of ~20 units. We use the
+ * below to count non-motion events to discard that first
+ * event with the jump.
+ */
+ unsigned int nonmotion_event_count;
+ } quirks;
};
#define tp_for_each_touch(_tp, _t) \
diff --git a/src/evdev.c b/src/evdev.c
index 51768fe8..a5c965d5 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -1680,6 +1680,7 @@ evdev_read_model_flags(struct evdev_device *device)
{ "LIBINPUT_MODEL_CYBORG_RAT", EVDEV_MODEL_CYBORG_RAT },
{ "LIBINPUT_MODEL_CYAPA", EVDEV_MODEL_CYAPA },
{ "LIBINPUT_MODEL_ALPS_RUSHMORE", EVDEV_MODEL_ALPS_RUSHMORE },
+ { "LIBINPUT_MODEL_LENOVO_T450_TOUCHPAD", EVDEV_MODEL_LENOVO_T450_TOUCHPAD },
{ NULL, EVDEV_MODEL_DEFAULT },
};
const struct model_map *m = model_map;
diff --git a/src/evdev.h b/src/evdev.h
index 482712bf..4a5d807d 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -113,6 +113,7 @@ enum evdev_device_model {
EVDEV_MODEL_CYBORG_RAT = (1 << 14),
EVDEV_MODEL_CYAPA = (1 << 15),
EVDEV_MODEL_ALPS_RUSHMORE = (1 << 16),
+ EVDEV_MODEL_LENOVO_T450_TOUCHPAD= (1 << 17),
};
struct mt_slot {