[PATCH 1/1] HID: multitouch: enable palm rejection if device implements confidence usage

From: Allen Hung
Date: Wed Nov 18 2015 - 04:52:29 EST

The usage Confidence is mandary to Windows Precision Touchpad devices. The
appearance of this usage is checked in hidinput_connect but the quirk
MT_QUIRK_VALID_IS_CONFIDENCE is not applied to the device accordingly.
Apply this quirk and also remove quirk MT_QUIRK_ALWAYS_VALID to enable the
palm rejection for the devices which implement the usage confidence in its
input reports.

Tested on Dell XPS 13 laptop.

Signed-off-by: Allen Hung <allen_hung@xxxxxxxx>
drivers/hid/hid-multitouch.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 426b2f1..661de1d 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -448,6 +448,8 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
mt_store_field(usage, td, hi);
return 1;
+ cls->quirks &= ~MT_QUIRK_ALWAYS_VALID;
mt_store_field(usage, td, hi);
return 1;

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