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; + } + } } }