HID: Add a hid quirk for input sync override

As of lately, HID devices which send per-frame data split over several
HID reports have started to emerge. This patch adds a quirk which
allows the HID driver to take over the input layer synchronization,
and hence the control of the frame boundary.
Signed-off-by: NHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-input.c

@@ -659,6 +659,9 @@ void hidinput_report_event(struct hid_device *hid, struct hid_report *report)
 {
 	struct hid_input *hidinput;
 
+	if (hid->quirks & HID_QUIRK_NO_INPUT_SYNC)
+		return;
+
 	list_for_each_entry(hidinput, &hid->inputs, list)
 		input_sync(hidinput->input);
 }

include/linux/hid.h

@@ -316,6 +316,7 @@ struct hid_item {
 #define HID_QUIRK_FULLSPEED_INTERVAL		0x10000000
 #define HID_QUIRK_NO_INIT_REPORTS		0x20000000
 #define HID_QUIRK_NO_IGNORE			0x40000000
+#define HID_QUIRK_NO_INPUT_SYNC			0x80000000
 
 /*
  * This is the global environment of the parser. This information is