Add class MT_CLS_EGALAX_P80H84 to describe eGalaxy P80H84 touchscreen.

The eGalaxy P80H84 touchscreen reports 'HID_GROUP_MULTITOUCH_WIN_8' and
this caused the generic 'MT_CLS_WIN_8' class to be detected.

The new class does _not_ export all inputs, since doing so results in a
visible mouse cursor when only the touchscreen is connected.

The visible mouse cursor was exposed by c23e2043d5f7 ("HID: multitouch:
do not filter mice nodes").

Before this change:

-- >8 --
kernel: input: eGalax Inc. eGalaxTouch P80H84 2537 v00_T3 k4.10.139 as /devices/platform/soc/2100000.bus/2184000.usb/ci_hdrc.0/usb1/1-1/1-1.4/1-1.4:1.0/0003:0EEF:C002.0001/input/input1
kernel: input: eGalax Inc. eGalaxTouch P80H84 2537 v00_T3 k4.10.139 UNKNOWN as /devices/platform/soc/2100000.bus/2184000.usb/ci_hdrc.0/usb1/1-1/1-1.4/1-1.4:1.0/0003:0EEF:C002.0001/input/input3
kernel: hid-multitouch 0003:0EEF:C002.0001: input,hidraw0: USB HID v1.11 Pointer [eGalax Inc. eGalaxTouch P80H84 2537 v00_T3 k4.10.139] on usb-ci_hdrc.0-1.4/input0
-- >8 --

After this change:

-- >8 --
kernel: input: eGalax Inc. eGalaxTouch P80H84 2537 v00_T3 k4.10.139 as /devices/platform/soc/2100000.bus/2184000.usb/ci_hdrc.0/usb1/1-1/1-1.4/1-1.4:1.0/0003:0EEF:C002.0001/input/input1
kernel: hid-multitouch 0003:0EEF:C002.0001: input,hidraw0: USB HID v1.11 Pointer [eGalax Inc. eGalaxTouch P80H84 2537 v00_T3 k4.10.139] on usb-ci_hdrc.0-1.4/input0
-- >8 --

Fixes: f9e82295eec1 ("HID: multitouch: add eGalaxTouch P80H84 support")
Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>
---
 drivers/hid/hid-multitouch.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 7daa8f6d8187..8052b35bfd7d 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -233,6 +233,7 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app);
 #define MT_CLS_SMART_TECH			0x0113
 #define MT_CLS_APPLE_TOUCHBAR			0x0114
 #define MT_CLS_YOGABOOK9I			0x0115
+#define MT_CLS_EGALAX_P80H84			0x0116
 #define MT_CLS_SIS				0x0457
 
 #define MT_DEFAULT_MAXCONTACT	10
@@ -438,6 +439,11 @@ static const struct mt_class mt_classes[] = {
 			MT_QUIRK_YOGABOOK9I,
 		.export_all_inputs = true
 	},
+	{ .name = MT_CLS_EGALAX_P80H84,
+		.quirks = MT_QUIRK_ALWAYS_VALID |
+			MT_QUIRK_IGNORE_DUPLICATES |
+			MT_QUIRK_CONTACT_CNT_ACCURATE,
+	},
 	{ }
 };
 
@@ -2215,8 +2221,9 @@ static const struct hid_device_id mt_devices[] = {
 	{ .driver_data = MT_CLS_EGALAX_SERIAL,
 		MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
 			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C000) },
-	{ .driver_data = MT_CLS_EGALAX,
-		MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
+	{ .driver_data = MT_CLS_EGALAX_P80H84,
+		HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
+			USB_VENDOR_ID_DWAV,
 			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C002) },
 
 	/* Elan devices */
-- 
2.49.0

On Tue, 17 Feb 2026, Ian Ray wrote:

> Add class MT_CLS_EGALAX_P80H84 to describe eGalaxy P80H84 touchscreen.
> 
> The eGalaxy P80H84 touchscreen reports 'HID_GROUP_MULTITOUCH_WIN_8' and
> this caused the generic 'MT_CLS_WIN_8' class to be detected.
> 
> The new class does _not_ export all inputs, since doing so results in a
> visible mouse cursor when only the touchscreen is connected.
> 
> The visible mouse cursor was exposed by c23e2043d5f7 ("HID: multitouch:
> do not filter mice nodes").

Applied to hid.git#for-7.0/upstream-fixes. Thanks,

-- 
Jiri Kosina
SUSE Labs