linux-kernel - [PATCH 4.4 58/88] Input: restore EV_ABS ABS

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Date:   Fri, 11 Jan 2019 15:08:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Hutterer <peter.hutterer@...-t.net>,
        Martin Kepplinger <martin.kepplinger@...zinger.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 58/88] Input: restore EV_ABS ABS_RESERVED

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit c201e3808e0e4be9b98d192802085a9f491bd80c ]

ABS_RESERVED was added in d9ca1c990a7 and accidentally removed as part of
ffe0e7cf290f5c9 when the high-resolution scrolling code was removed.

Signed-off-by: Peter Hutterer <peter.hutterer@...-t.net>
Reviewed-by: Martin Kepplinger <martin.kepplinger@...zinger.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/uapi/linux/input-event-codes.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index 87cf351bab03..9e07bf4259e1 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -708,6 +708,15 @@
 
 #define ABS_MISC		0x28
 
+/*
+ * 0x2e is reserved and should not be used in input drivers.
+ * It was used by HID as ABS_MISC+6 and userspace needs to detect if
+ * the next ABS_* event is correct or is just ABS_MISC + n.
+ * We define here ABS_RESERVED so userspace can rely on it and detect
+ * the situation described above.
+ */
+#define ABS_RESERVED		0x2e
+
 #define ABS_MT_SLOT		0x2f	/* MT slot being modified */
 #define ABS_MT_TOUCH_MAJOR	0x30	/* Major axis of touching ellipse */
 #define ABS_MT_TOUCH_MINOR	0x31	/* Minor axis (omit if circular) */
-- 
2.19.1