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: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 6c03dcc..b186f6d 100644 (file)
--- a/drivers/hid/hid-input.c
+++ b/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);
 }

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 42a0f1d..4cfe02c 100644 (file)
--- a/include/linux/hid.h
+++ b/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