LXR linux/drivers/hid/hid-holtek-mouse.c

   1/*
   2 * HID driver for Holtek gaming mice
   3 * Copyright (c) 2013 Christian Ohm
   4 * Heavily inspired by various other HID drivers that adjust the report
   5 * descriptor.
   6*/
   7
   8/*
   9 * This program is free software; you can redistribute it and/or modify it
  10 * under the terms of the GNU General Public License as published by the Free
  11 * Software Foundation; either version 2 of the License, or (at your option)
  12 * any later version.
  13 */
  14
  15#include <linux/hid.h>
  16#include <linux/module.h>
  17#include <linux/usb.h>
  18
  19#include "hid-ids.h"
  20
  21/*
  22 * The report descriptor of some Holtek based gaming mice specifies an
  23 * excessively large number of consumer usages (2^15), which is more than
  24 * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.
  25 *
  26 * This driver fixes the report descriptor for:
  27 * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000
  28 * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200
  29 *   and Zalman ZM-GM1
  30 */
  31
  32static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  33                unsigned int *rsize)
  34{
  35        struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  36
  37        if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
  38                /* Change usage maximum and logical maximum from 0x7fff to
  39                 * 0x2fff, so they don't exceed HID_MAX_USAGES */
  40                switch (hdev->product) {
  41                case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:
  42                        if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
  43                                        && rdesc[120] == 0xff && rdesc[121] == 0x7f) {
  44                                hid_info(hdev, "Fixing up report descriptor\n");
  45                                rdesc[116] = rdesc[121] = 0x2f;
  46                        }
  47                        break;
  48                case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:
  49                        if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
  50                                        && rdesc[111] == 0xff && rdesc[112] == 0x7f) {
  51                                hid_info(hdev, "Fixing up report descriptor\n");
  52                                rdesc[107] = rdesc[112] = 0x2f;
  53                        }
  54                        break;
  55                }
  56
  57        }
  58        return rdesc;
  59}
  60
  61static const struct hid_device_id holtek_mouse_devices[] = {
  62        { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  63                        USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
  64        { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  65                        USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
  66        { }
  67};
  68MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
  69
  70static struct hid_driver holtek_mouse_driver = {
  71        .name = "holtek_mouse",
  72        .id_table = holtek_mouse_devices,
  73        .report_fixup = holtek_mouse_report_fixup,
  74};
  75
  76module_hid_driver(holtek_mouse_driver);
  77MODULE_LICENSE("GPL");
  78