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path: root/drivers/hid/hid-multitouch.c
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Diffstat (limited to 'drivers/hid/hid-multitouch.c')
-rw-r--r--drivers/hid/hid-multitouch.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6a9b05b32..7c811252c 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -778,9 +778,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
/*
* some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
* for the stylus.
+ * The check for mt_report_id ensures we don't process
+ * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
+ * collection, but within the report ID.
*/
if (field->physical == HID_DG_STYLUS)
return 0;
+ else if ((field->physical == 0) &&
+ (field->report->id != td->mt_report_id) &&
+ (td->mt_report_id != -1))
+ return 0;
if (field->application == HID_DG_TOUCHSCREEN ||
field->application == HID_DG_TOUCHPAD)