| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 46/78] HID: multitouch: require Finger field to mark Win8 reports as MT | Date | Tue, 8 Jun 2021 20:27:15 +0200 |
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From: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
commit a2353e3b26012ff43bcdf81d37a3eaddd7ecdbf3 upstream.
This effectively changes collection_is_mt from contact ID in report->field to (device is Win8 => collection is finger) && contact ID in report->field
Some devices erroneously report Pen for fingers, and Win8 stylus-on-touchscreen devices report contact ID, but mark the accompanying touchscreen device's collection correctly
Cc: stable@vger.kernel.org Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/hid/hid-multitouch.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -611,9 +611,13 @@ static struct mt_report_data *mt_allocat if (!(HID_MAIN_ITEM_VARIABLE & field->flags)) continue; - for (n = 0; n < field->report_count; n++) { - if (field->usage[n].hid == HID_DG_CONTACTID) - rdata->is_mt_collection = true; + if (field->logical == HID_DG_FINGER || td->hdev->group != HID_GROUP_MULTITOUCH_WIN_8) { + for (n = 0; n < field->report_count; n++) { + if (field->usage[n].hid == HID_DG_CONTACTID) { + rdata->is_mt_collection = true; + break; + } + } } }
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