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"); 78