linux-kernel - [PATCH AUTOSEL for 4.15 009/102] HID: elo: clear BTN

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Message-ID: <20180303222318.26006-9-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:24:14 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Jiri Kosina <jkosina@...e.cz>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 009/102] HID: elo: clear BTN_LEFT mapping

From: Jiri Kosina <jkosina@...e.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@...e.cz>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/hid/hid-elo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c
index 0cd4f7216239..5eea6fe0d7bd 100644
--- a/drivers/hid/hid-elo.c
+++ b/drivers/hid/hid-elo.c
@@ -42,6 +42,12 @@ static int elo_input_configured(struct hid_device *hdev,
 {
 	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);
-- 
2.14.1