[PATCH libinput] evdev: disable ABS_MT_TOOL_PALM on the Lenovo X1 Carbon 6th gen

[Peter Hutterer]

This device randomly decides that a touch is now a palm, based on
the moon phase, the user's starsign and possibly what the dog had for
breakfast. Since libinput assumes that a touchpad that labels a touch as palm
has reasons to do so, let's unassume this for this device by disabling that
axis altogether and relying on the touch pressure only.

https://bugzilla.redhat.com/show_bug.cgi?id=1565692

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/evdev.c                        | 8 ++++++++
 src/evdev.h                        | 1 +
 udev/90-libinput-model-quirks.hwdb | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/src/evdev.c b/src/evdev.c
index 2a4682c7..95351082 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -1285,6 +1285,7 @@ evdev_read_model_flags(struct evdev_device *device)
 		MODEL(MS_NANO_TRANSCEIVER),
 		MODEL(TABLET_NO_TILT),
 		MODEL(TABLET_MODE_NO_SUSPEND),
+		MODEL(LENOVO_CARBON_X1_6TH),
 #undef MODEL
 		{ "ID_INPUT_TRACKBALL", EVDEV_MODEL_TRACKBALL },
 		{ NULL, EVDEV_MODEL_DEFAULT },
@@ -1908,6 +1909,13 @@ evdev_pre_configure_model_quirks(struct evdev_device *device)
 		libevdev_disable_event_code(device->evdev, EV_ABS, ABS_TILT_X);
 		libevdev_disable_event_code(device->evdev, EV_ABS, ABS_TILT_Y);
 	}
+
+	/* Lenovo Carbon X1 6th gen sends bogus ABS_MT_TOOL_TYPE events for
+	 * MT_TOOL_PALM */
+	if (device->model_flags & EVDEV_MODEL_LENOVO_CARBON_X1_6TH)
+		libevdev_disable_event_code(device->evdev,
+					    EV_ABS,
+					    ABS_MT_TOOL_TYPE);
 }
 
 static void
diff --git a/src/evdev.h b/src/evdev.h
index 5495e94d..d1290610 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -113,6 +113,7 @@ enum evdev_device_model {
 	EVDEV_MODEL_JUMPING_SEMI_MT = (1 << 10),
 	EVDEV_MODEL_LOGITECH_K400 = (1 << 11),
 	EVDEV_MODEL_LENOVO_X220_TOUCHPAD_FW81 = (1 << 12),
+	EVDEV_MODEL_LENOVO_CARBON_X1_6TH = (1 << 13),
 	EVDEV_MODEL_CYBORG_RAT = (1 << 14),
 	EVDEV_MODEL_HP_STREAM11_TOUCHPAD = (1 << 16),
 	EVDEV_MODEL_LENOVO_T450_TOUCHPAD= (1 << 17),
diff --git a/udev/90-libinput-model-quirks.hwdb b/udev/90-libinput-model-quirks.hwdb
index 33676d4e..9dcb38e3 100644
--- a/udev/90-libinput-model-quirks.hwdb
+++ b/udev/90-libinput-model-quirks.hwdb
@@ -245,6 +245,10 @@ libinput:name:*ALPS TrackPoint*:svnLENOVO:*:pvrThinkPadX280:*
 libinput:name:AT Translated Set 2 keyboard:dmi:*svnLENOVO:*pvrThinkPadX1Yoga1st:*
  LIBINPUT_MODEL_TABLET_MODE_NO_SUSPEND=1
 
+# Lenovo Carbon X1 6th gen (RMI4 only, PS/2 is broken on this device)
+libinput:name:Synaptics TM3288-010:dmi:*svnLenovo:*pvrThinkPadX1Carbon6th:*
+ LIBINPUT_MODEL_LENOVO_CARBON_X1_6TH=1
+
 ##########################################
 # Logitech
 ##########################################
-- 
2.14.3