From: Roderick Colenbrander <roderick.colenbrander@sony.com>

The input-mt driver pointer emulation from 'input_mt_sync_frame' regardless
of the flags passed in to 'input_mt_init_slots' by device drivers.

Pointer emulation is undesired on drivers, which didn't request this
capability like the hid-sony driver for the Dualshock 4. This gamepad already
reports ABS_X / ABS_Y for gamepad stick purposes. Pointer emulation would
inject touchpad values into these sticks, which is undesired.

This patch checks the flags INPUT_MT_POINTER / INPUT_MT_DIRECT from within
input_mt_sync_frame to only allow pointer emulation when the feature was
requested by the driver as the flags were set in input_mt_init_slots.
---
 drivers/input/input-mt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index a1bbec9..30c8128 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c

@@ -305,7 +305,8 @@ void input_mt_sync_frame(struct input_dev *dev)
 	if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))
 		use_count = true;
 
-	input_mt_report_pointer_emulation(dev, use_count);
+	if (mt->flags & (INPUT_MT_POINTER | INPUT_MT_DIRECT))
+		input_mt_report_pointer_emulation(dev, use_count);
 
 	mt->frame++;
 }

-- 
2.7.4