[PATCH 4/4] HID: multitouch: pick the contact count field in advance

[Benjamin Tissoires]

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>
---
 drivers/hid/hid-multitouch.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6ce232e..3d7db96 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -698,6 +698,13 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
 	if (report->id != td->mt_report_id)
 		return;
 
+	/*
+	 * Includes multi-packet support where subsequent
+	 * packets are sent with zero contactcount.
+	 */
+	if (field_cc->value[td->contactcount_index])
+		td->num_expected = field_cc->value[td->contactcount_index];
+
 	for (r = 0; r < report->maxfield; r++) {
 		field = report->field[r];
 		count = field->report_count;
-- 
1.8.1


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