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"); 82