root/drivers/hid/hid-holtek-mouse.c

DEFINITIONS

1. holtek_mouse_report_fixup

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HID driver for Holtek gaming mice
   4  * Copyright (c) 2013 Christian Ohm
   5  * Heavily inspired by various other HID drivers that adjust the report
   6  * descriptor.
   7 */
   8 
   9 /*
  10  */
  11 
  12 #include <linux/hid.h>
  13 #include <linux/module.h>
  14 #include <linux/usb.h>
  15 
  16 #include "hid-ids.h"
  17 
  18 /*
  19  * The report descriptor of some Holtek based gaming mice specifies an
  20  * excessively large number of consumer usages (2^15), which is more than
  21  * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.
  22  *
  23  * This driver fixes the report descriptor for:
  24  * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000
  25  * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200
  26  *   and Zalman ZM-GM1
  27  * - USB ID 04d9:a081, sold as SHARKOON DarkGlider Gaming mouse
  28  * - USB ID 04d9:a072, sold as LEETGION Hellion Gaming Mouse
  29  * - USB ID 04d9:a0c2, sold as ETEKCITY Scroll T-140 Gaming Mouse
  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                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072:
  43                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2:
  44                         if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
  45                                         && rdesc[120] == 0xff && rdesc[121] == 0x7f) {
  46                                 hid_info(hdev, "Fixing up report descriptor\n");
  47                                 rdesc[116] = rdesc[121] = 0x2f;
  48                         }
  49                         break;
  50                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:
  51                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070:
  52                 case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:
  53                         if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
  54                                         && rdesc[111] == 0xff && rdesc[112] == 0x7f) {
  55                                 hid_info(hdev, "Fixing up report descriptor\n");
  56                                 rdesc[107] = rdesc[112] = 0x2f;
  57                         }
  58                         break;
  59                 }
  60 
  61         }
  62         return rdesc;
  63 }
  64 
  65 static const struct hid_device_id holtek_mouse_devices[] = {
  66         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  67                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
  68         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  69                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070) },
  70         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  71                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
  72         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  73                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072) },
  74         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  75                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },
  76         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  77                         USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2) },
  78         { }
  79 };
  80 MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
  81 
  82 static struct hid_driver holtek_mouse_driver = {
  83         .name = "holtek_mouse",
  84         .id_table = holtek_mouse_devices,
  85         .report_fixup = holtek_mouse_report_fixup,
  86 };
  87 
  88 module_hid_driver(holtek_mouse_driver);
  89 MODULE_LICENSE("GPL");