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
  32 static __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
  61 static 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 };
  68 MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
  69
  70 static 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
  76 module_hid_driver(holtek_mouse_driver);
  77 MODULE_LICENSE("GPL");