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  * - USB ID 04d9:a081, sold as SHARKOON DarkGlider Gaming mouse
  31  */
  32
  33 static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  34                 unsigned int *rsize)
  35 {
  36         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  37
  38         if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
  39                 /* Change usage maximum and logical maximum from 0x7fff to
  40                  * 0x2fff, so they don't exceed HID_MAX_USAGES */
  41                 switch (hdev->product) {
  42                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:
  43                         if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
  44                                         && rdesc[120] == 0xff && rdesc[121] == 0x7f) {
  45                                 hid_info(hdev, "Fixing up report descriptor\n");
  46                                 rdesc[116] = rdesc[121] = 0x2f;
  47                         }
  48                         break;
  49                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:
  50                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:
  51                         if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
  52                                         && rdesc[111] == 0xff && rdesc[112] == 0x7f) {
  53                                 hid_info(hdev, "Fixing up report descriptor\n");
  54                                 rdesc[107] = rdesc[112] = 0x2f;
  55                         }
  56                         break;
  57                 }
  58
  59         }
  60         return rdesc;
  61 }
  62
  63 static const struct hid_device_id holtek_mouse_devices[] = {
  64         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  65                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
  66         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  67                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
  68         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  69                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },
  70         { }
  71 };
  72 MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
  73
  74 static struct hid_driver holtek_mouse_driver = {
  75         .name = "holtek_mouse",
  76         .id_table = holtek_mouse_devices,
  77         .report_fixup = holtek_mouse_report_fixup,
  78 };
  79
  80 module_hid_driver(holtek_mouse_driver);
  81 MODULE_LICENSE("GPL");