Linux N-key keyboard repeating key fix

--- drivers/hid/hid-input.c.original    2014-09-05 21:51:41.421798237 +0300
+++ drivers/hid/hid-input.c     2014-09-05 22:03:30.573774280 +0300
@@ -1063,6 +1063,20 @@ void hidinput_hid_event(struct hid_devic
                return;
        }

+       /*
+        * Some keyboards will report both HID keys 0x31 (\ and |) and
+        * 0x32 (Non-US # and ~) which are both mapped to
+        * KEY_BACKSLASH. This will cause spurious events causing
+        * repeated backslash key presses. Handle this by tracking the
+        * active HID code and ignoring the other one.
+        */
+       if (usage->type == EV_KEY && usage->code == KEY_BACKSLASH) {
+               if (value)
+                       field->hidinput->backslash_usage = usage->hid;
+               else if (field->hidinput->backslash_usage != usage->hid)
+                       return;
+       }
+
        /* report the usage code as scancode if the key status has changed */
        if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value)
                input_event(input, EV_MSC, MSC_SCAN, usage->hid);
--- include/linux/hid.h.original        2014-09-05 21:52:03.615797487 +0300
+++ include/linux/hid.h 2014-09-05 22:03:30.573774280 +0300
@@ -432,6 +432,7 @@ struct hid_input {
        struct list_head list;
        struct hid_report *report;
        struct input_dev *input;
+       unsigned backslash_usage;
 };

 enum hid_type {