From f320308cc2368ecbbecc04b9caf0f74523c62ab0 Mon Sep 17 00:00:00 2001
From: jcs <jcs@openbsd.org>
Date: Sat, 1 Sep 2018 20:50:16 +0000
Subject: [PATCH] Match on interfaces with Digitizers/Touchscreen collections,
 as long as they have an X usage.

Should get basic touchscreen functionality on some common
HID-over-i2c devices like laptops.
---
 sys/dev/i2c/ims.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sys/dev/i2c/ims.c b/sys/dev/i2c/ims.c
index c3bc81ed84b..e74dd8554c2 100644
--- a/sys/dev/i2c/ims.c
+++ b/sys/dev/i2c/ims.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ims.c,v 1.1 2016/01/12 01:11:15 jcs Exp $ */
+/* $OpenBSD: ims.c,v 1.2 2018/09/01 20:50:16 jcs Exp $ */
 /*
  * HID-over-i2c mouse/trackpad driver
  *
@@ -85,6 +85,12 @@ ims_match(struct device *parent, void *match, void *aux)
 	    HID_USAGE2(HUP_DIGITIZERS, HUD_PEN)))
 		return (IMATCH_IFACECLASS);
 
+	if (hid_is_collection(desc, size, iha->reportid,
+	    HID_USAGE2(HUP_DIGITIZERS, HUD_TOUCHSCREEN)) &&
+	    hid_locate(desc, size, HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_X),
+	    iha->reportid, hid_input, NULL, NULL))
+		return (IMATCH_IFACECLASS);
+
 	return (IMATCH_NONE);
 }
 
-- 
2.20.1