linux-imx

/*

 * HID driver for Holtek gaming mice

 * Copyright (c) 2013 Christian Ohm

 * Heavily inspired by various other HID drivers that adjust the report

 * descriptor.

*/

​

/*

 * 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 <linux/usb.h>

​

#include "hid-ids.h"

​

/*

 * The report descriptor of some Holtek based gaming mice specifies an

 * excessively large number of consumer usages (2^15), which is more than

 * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.

 *

 * This driver fixes the report descriptor for:

 * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000

 * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200

 *   and Zalman ZM-GM1

 * - USB ID 04d9:a081, sold as SHARKOON DarkGlider Gaming mouse

 * - USB ID 04d9:a072, sold as LEETGION Hellion Gaming Mouse

 * - USB ID 04d9:a0c2, sold as ETEKCITY Scroll T-140 Gaming Mouse

 */

​

static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,

        unsigned int *rsize)

{

    struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

​

    if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {

        /* Change usage maximum and logical maximum from 0x7fff to

         * 0x2fff, so they don't exceed HID_MAX_USAGES */

        switch (hdev->product) {

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072:

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2:

            if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f

                    && rdesc[120] == 0xff && rdesc[121] == 0x7f) {

                hid_info(hdev, "Fixing up report descriptor\n");

                rdesc[116] = rdesc[121] = 0x2f;

            }

            break;

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070:

        case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:

            if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f

                    && rdesc[111] == 0xff && rdesc[112] == 0x7f) {

                hid_info(hdev, "Fixing up report descriptor\n");

                rdesc[107] = rdesc[112] = 0x2f;

            }

            break;

        }

​