Patch "HID: elo: clear BTN_LEFT mapping" has been added to the 3.18-stable tree

Patch "HID: elo: clear BTN_LEFT mapping" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    HID: elo: clear BTN_LEFT mapping

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hid-elo-clear-btn_left-mapping.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Mar 19 10:11:52 CET 2018
From: Jiri Kosina <jkosina@suse.cz>
Date: Wed, 22 Nov 2017 11:19:51 +0100
Subject: HID: elo: clear BTN_LEFT mapping

From: Jiri Kosina <jkosina@suse.cz>


[ Upstream commit 9abd04af951e5734c9d5cfee9b49790844b734cf ]

ELO devices have one Button usage in GenDesk field, which makes hid-input map
it to BTN_LEFT; that confuses userspace, which then considers the device to be
a mouse/touchpad instead of touchscreen.

Fix that by unmapping BTN_LEFT and keeping only BTN_TOUCH in place.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/hid/hid-elo.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/hid/hid-elo.c
+++ b/drivers/hid/hid-elo.c
@@ -42,6 +42,12 @@ static void elo_input_configured(struct
 {
 	struct input_dev *input = hidinput->input;
 
+	/*
+	 * ELO devices have one Button usage in GenDesk field, which makes
+	 * hid-input map it to BTN_LEFT; that confuses userspace, which then
+	 * considers the device to be a mouse/touchpad instead of touchscreen.
+	 */
+	clear_bit(BTN_LEFT, input->keybit);
 	set_bit(BTN_TOUCH, input->keybit);
 	set_bit(ABS_PRESSURE, input->absbit);
 	input_set_abs_params(input, ABS_PRESSURE, 0, 256, 0, 0);


Patches currently in stable-queue which might be from jkosina@suse.cz are

queue-3.18/hid-elo-clear-btn_left-mapping.patch
queue-3.18/hid-clamp-input-to-logical-range-if-no-null-state.patch
queue-3.18/hid-reject-input-outside-logical-range-only-if-null-state-is-set.patch