From: Kerem Karabay <kekrby@xxxxxxxxx>
In Apple Touch Bar, the tip state is contained in fields with the
HID_DG_TOUCH usage. This feature is gated by a quirk in order to
prevent breaking other devices, see commit c2ef8f21ea8f
("HID: multitouch: add support for trackpads").
Signed-off-by: Kerem Karabay <kekrby@xxxxxxxxx>
Co-developed-by: Aditya Garg <gargaditya08@xxxxxxxx>
Signed-off-by: Aditya Garg <gargaditya08@xxxxxxxx>
---
drivers/hid/hid-multitouch.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6e7f34a47..70fdd8cf9 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -827,6 +827,17 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
MT_STORE_FIELD(confidence_state);
return 1;
+ case HID_DG_TOUCH:
+ /*
+ * Legacy devices use TIPSWITCH and not TOUCH.
+ * One special case here is of the Apple Touch Bars.
+ * In these devices, the tip state is contained in
+ * fields with the HID_DG_TOUCH usage.
+ * Let's just ignore this field for other devices.
+ */
+ if (!(cls->quirks & MT_QUIRK_APPLE_TOUCHBAR))
+ return -1;
+ fallthrough;
case HID_DG_TIPSWITCH:
if (field->application != HID_GD_SYSTEM_MULTIAXIS)
input_set_capability(hi->input,
@@ -897,10 +908,6 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_DG_CONTACTMAX:
/* contact max are global to the report */
return -1;
- case HID_DG_TOUCH:
- /* Legacy devices use TIPSWITCH and not TOUCH.
- * Let's just ignore this field. */
- return -1;
}
/* let hid-input decide for the others */
return 0;
--
2.43.0
