linux-kernel - [PATCH] xen/input: do not advertise multi-touch pressure support

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Date:   Tue,  2 Jan 2018 10:12:55 +0200
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, dmitry.torokhov@...il.com
Cc:     andr2000@...il.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        Andrii Chepurnyi <andrii_chepurnyi@...m.com>
Subject: [PATCH] xen/input: do not advertise multi-touch pressure support

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>

Some user-space applications expect multi-touch pressure
on contact to be reported if it is advertised in device
properties. Otherwise, such applications may treat reports
not as actual touches, but hovering. Currently this is
only advertised, but not reported.
Fix this by not advertising that ABS_MT_PRESSURE is supported.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Signed-off-by: Andrii Chepurnyi <andrii_chepurnyi@...m.com>
---
 drivers/input/misc/xen-kbdfront.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 6bf56bb5f8d9..d91f3b1c5375 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -326,8 +326,6 @@ static int xenkbd_probe(struct xenbus_device *dev,
 				     0, width, 0, 0);
 		input_set_abs_params(mtouch, ABS_MT_POSITION_Y,
 				     0, height, 0, 0);
-		input_set_abs_params(mtouch, ABS_MT_PRESSURE,
-				     0, 255, 0, 0);
 
 		ret = input_mt_init_slots(mtouch, num_cont, INPUT_MT_DIRECT);
 		if (ret) {
-- 
2.7.4