HID: Add special driver for Jabra devices

Add a hid-jabra driver to the list of special drivers in hid-core. The
driver prevents vendor defined HID usages (FF00-FFFF) in Jabra devices
from being mapped to input events, that become unintended mouse events
in the X11 server.

Signed-off-by: Niels Skou Olsen <nolsen@jabra.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-jabra.c

@@ -0,0 +1,58 @@
+/*
+ *  Jabra USB HID Driver
+ *
+ *  Copyright (c) 2017 Niels Skou Olsen <nolsen@jabra.com>
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define HID_UP_VENDOR_DEFINED_MIN	0xff000000
+#define HID_UP_VENDOR_DEFINED_MAX	0xffff0000
+
+static int jabra_input_mapping(struct hid_device *hdev,
+			       struct hid_input *hi,
+			       struct hid_field *field,
+			       struct hid_usage *usage,
+			       unsigned long **bit, int *max)
+{
+	int is_vendor_defined =
+		((usage->hid & HID_USAGE_PAGE) >= HID_UP_VENDOR_DEFINED_MIN &&
+		 (usage->hid & HID_USAGE_PAGE) <= HID_UP_VENDOR_DEFINED_MAX);
+
+	dbg_hid("hid=0x%08x appl=0x%08x coll_idx=0x%02x usage_idx=0x%02x: %s\n",
+		usage->hid,
+		field->application,
+		usage->collection_index,
+		usage->usage_index,
+		is_vendor_defined ? "ignored" : "defaulted");
+
+	/* Ignore vendor defined usages, default map standard usages */
+	return is_vendor_defined ? -1 : 0;
+}
+
+static const struct hid_device_id jabra_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_JABRA, HID_ANY_ID) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, jabra_devices);
+
+static struct hid_driver jabra_driver = {
+	.name = "jabra",
+	.id_table = jabra_devices,
+	.input_mapping = jabra_input_mapping,
+};
+module_hid_driver(jabra_driver);
+
+MODULE_AUTHOR("Niels Skou Olsen <nolsen@jabra.com>");
+MODULE_DESCRIPTION("Jabra USB HID Driver");
+MODULE_LICENSE("GPL");