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HID: multitouch: support getting the tip state from HID_DG_TOUCH fields in Apple Touch Bar

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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 c2ef8f21ea
("HID: multitouch: add support for trackpads").

Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Co-developed-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Kerem Karabay 2025-05-27 22:13:14 +05:30 • committed by Jiri Kosina
parent f41d736acc
commit e0976a61a5
1 changed files with 11 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

15
drivers/hid/hid-multitouch.c
View file

@ -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;