quirks: touchpad: add ModelPressurePad

Unlike in traditional touchpads, whose pressure value equals contact
size, on pressure pads pressure is a real physical axis.

We don't take advantage of the pressure information reported by
pressure pads yet, so we disable it to avoid errors.

Add a new model quirk for pressure pads instead of disabling
ABS_MT_PRESSURE and ABS_PRESSURE.

Signed-off-by: José Expósito <jose.exposito89@gmail.com>

6 files changed, 11 insertions, 4 deletions

diff --git a/doc/user/device-quirks.rst b/doc/user/device-quirks.rst
index d7461b08..deced521 100644
--- a/doc/user/device-quirks.rst
+++ b/doc/user/device-quirks.rst
@@ -147,6 +147,10 @@ ModelBouncingKeys
     timestamps can not be relied upon.
 ModelSynapticsSerialTouchpad
     Reserved for touchpads made by Synaptics on the serial bus
+ModelPressurePad
+    Unlike in traditional touchpads, whose pressure value equals contact size,
+    on pressure pads pressure is a real physical axis.
+    Indicates that the device is a pressure pad.
 AttrSizeHint=NxM, AttrResolutionHint=N
     Hints at the width x height of the device in mm, or the resolution
     of the x/y axis in units/mm. These may only be used where they apply to
diff --git a/quirks/50-system-dell.quirks b/quirks/50-system-dell.quirks
index b4605c76..a09a3a3a 100644
--- a/quirks/50-system-dell.quirks
+++ b/quirks/50-system-dell.quirks
@@ -120,4 +120,4 @@ ModelTabletModeNoSuspend=1
 MatchBus=i2c
 MatchVendor=0x27C6
 MatchProduct=0x0F60
-AttrEventCode=-ABS_MT_PRESSURE;-ABS_PRESSURE;
+ModelPressurePad=1
diff --git a/quirks/50-system-lenovo.quirks b/quirks/50-system-lenovo.quirks
index ade45883..551d23c2 100644
--- a/quirks/50-system-lenovo.quirks
+++ b/quirks/50-system-lenovo.quirks
@@ -147,7 +147,7 @@ AttrTrackpointMultiplier=1.25
 MatchBus=i2c
 MatchVendor=0x06CB
 MatchProduct=0xCE37
-AttrEventCode=-ABS_MT_PRESSURE;-ABS_PRESSURE;
+ModelPressurePad=1
 
 [Lenovo Yoga C930 Tablet]
 MatchBus=i2c
@@ -272,7 +272,7 @@ AttrKeyboardIntegration=internal
 MatchBus=i2c
 MatchVendor=0x27C6
 MatchProduct=0x01E8
-AttrEventCode=-ABS_MT_PRESSURE;-ABS_PRESSURE;
+ModelPressurePad=1
 
 # Duet 7i tablet switch activated by folding keyboard cover, or removing it.
 # We must not disable volume rocker 'keyboard'.
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index c79133b5..1ccf8037 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -3702,7 +3702,8 @@ tp_init_pressurepad(struct tp_dispatch *tp,
 	 *
 	 * See also #562
 	 */
-	if (libevdev_get_abs_resolution(device->evdev, ABS_MT_PRESSURE) != 0) {
+	if (libevdev_get_abs_resolution(device->evdev, ABS_MT_PRESSURE) != 0 ||
+	    evdev_device_has_model_quirk(device, QUIRK_MODEL_PRESSURE_PAD)) {
 		libevdev_disable_event_code(device->evdev, EV_ABS, ABS_MT_PRESSURE);
 		libevdev_disable_event_code(device->evdev, EV_ABS, ABS_PRESSURE);
 	}
diff --git a/src/quirks.c b/src/quirks.c
index 0e3006b5..7e916009 100644
--- a/src/quirks.c
+++ b/src/quirks.c
@@ -269,6 +269,7 @@ quirk_get_name(enum quirk q)
 	case QUIRK_MODEL_TOUCHPAD_VISIBLE_MARKER:	return "ModelTouchpadVisibleMarker";
 	case QUIRK_MODEL_TRACKBALL:			return "ModelTrackball";
 	case QUIRK_MODEL_WACOM_TOUCHPAD:		return "ModelWacomTouchpad";
+	case QUIRK_MODEL_PRESSURE_PAD:			return "ModelPressurePad";
 
 	case QUIRK_ATTR_SIZE_HINT:			return "AttrSizeHint";
 	case QUIRK_ATTR_TOUCH_SIZE_RANGE:		return "AttrTouchSizeRange";
diff --git a/src/quirks.h b/src/quirks.h
index bd96c3af..30878546 100644
--- a/src/quirks.h
+++ b/src/quirks.h
@@ -86,6 +86,7 @@ enum quirk {
 	QUIRK_MODEL_TOUCHPAD_VISIBLE_MARKER,
 	QUIRK_MODEL_TRACKBALL,
 	QUIRK_MODEL_WACOM_TOUCHPAD,
+	QUIRK_MODEL_PRESSURE_PAD,
 
 	_QUIRK_LAST_MODEL_QUIRK_, /* Guard: do not modify */