HID: add support for Kye/Genius Ergo 525V

This device sends several buttons in a separate field, which is
wrongly described in the report descriptor. Fix it in the following
way:

- change led usage page to button
- report size 8 count 1 becomes report size 1 count 8
- the button usage range changed to 4-7 (the mouse has three buttons in
  a different field already).

Reported-by: Tomas Hanak <tomas.hanak@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-kye.c

@@ -0,0 +1,71 @@
+/*
+ *  HID driver for Kye/Genius devices not fully compliant with HID standard
+ *
+ *  Copyright (c) 2009 Jiri Kosina
+ *  Copyright (c) 2009 Tomas Hanak
+ */
+
+/*
+ * 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/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+/* the fixups that need to be done:
+ *   - change led usage page to button for extra buttons
+ *   - report size 8 count 1 must be size 1 count 8 for button bitfield
+ *   - change the button usage range to 4-7 for the extra buttons
+ */
+static void kye_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int rsize)
+{
+	if (rsize >= 74 &&
+		rdesc[61] == 0x05 && rdesc[62] == 0x08 &&
+		rdesc[63] == 0x19 && rdesc[64] == 0x08 &&
+		rdesc[65] == 0x29 && rdesc[66] == 0x0f &&
+		rdesc[71] == 0x75 && rdesc[72] == 0x08 &&
+		rdesc[73] == 0x95 && rdesc[74] == 0x01) {
+		dev_info(&hdev->dev, "fixing up Kye/Genius Ergo Mouse report "
+				"descriptor\n");
+		rdesc[62] = 0x09;
+		rdesc[64] = 0x04;
+		rdesc[66] = 0x07;
+		rdesc[72] = 0x01;
+		rdesc[74] = 0x08;
+	}
+}
+
+static const struct hid_device_id kye_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_ERGO_525V) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, kye_devices);
+
+static struct hid_driver kye_driver = {
+	.name = "kye",
+	.id_table = kye_devices,
+	.report_fixup = kye_report_fixup,
+};
+
+static int kye_init(void)
+{
+	return hid_register_driver(&kye_driver);
+}
+
+static void kye_exit(void)
+{
+	hid_unregister_driver(&kye_driver);
+}
+
+module_init(kye_init);
+module_exit(kye_exit);
+MODULE_LICENSE("GPL");
+
+HID_COMPAT_LOAD_DRIVER(kye);