[PATCH AUTOSEL for 3.18 47/63] HID: elo: clear BTN_LEFT mapping

[Sasha Levin]

From: Jiri Kosina <jkos...@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 <jkos...@suse.cz>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.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 d0c8a1c1e1fe..2fc43ad7f0b6 100644
--- a/drivers/hid/hid-elo.c
+++ b/drivers/hid/hid-elo.c
@@ -42,6 +42,12 @@ static void 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