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Commit e24d0d39 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina
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HID: core: do not scan constant input report 



The Microsoft Surface Type/Touch Cover 2 is a fancy device which advertised
itself as a multitouch device but with constant input reports.
This way, hid_scan_report() gives the group MULTITOUCH to it, but
hid-multitouch can not handle it due to the constant collection ignored
by hid-input.

To prevent such crap in the future, and while we do not fix this particular
device, make the scan_report coherent with hid-input.c, and ignore constant
input reports.

CC: stable@vger.kernel.org # 3.12+
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent f3b0cbce

drivers/hid/hid-core.c

+3 −0
Original line number Diff line number Diff line
@@ -718,6 +718,9 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) 
	case HID_MAIN_ITEM_TAG_END_COLLECTION:

		break;

	case HID_MAIN_ITEM_TAG_INPUT:

		/* ignore constant inputs, they will be ignored by hid-input */

		if (data & HID_MAIN_ITEM_CONSTANT)

			break;

		for (i = 0; i < parser->local.usage_index; i++)

			hid_scan_input_usage(parser, parser->local.usage[i]);

		break;