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/*
* HID driver for Holtek gaming mice
* Copyright (c) 2013 Christian Ohm
* Heavily inspired by various other HID drivers that adjust the report
* descriptor.
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "hid-ids.h"
/*
* The report descriptor of some Holtek based gaming mice specifies an
* excessively large number of consumer usages (2^15), which is more than
* HID_MAX_USAGES. This prevents proper parsing of the report descriptor.
*
* This driver fixes the report descriptor for:
* - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000
* - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200
* and Zalman ZM-GM1
*/
static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
/* Change usage maximum and logical maximum from 0x7fff to
* 0x2fff, so they don't exceed HID_MAX_USAGES */
switch (hdev->product) {
case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:
if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
&& rdesc[120] == 0xff && rdesc[121] == 0x7f) {
hid_info(hdev, "Fixing up report descriptor\n");
rdesc[116] = rdesc[121] = 0x2f;
}
break;
case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:
if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
&& rdesc[111] == 0xff && rdesc[112] == 0x7f) {
hid_info(hdev, "Fixing up report descriptor\n");
rdesc[107] = rdesc[112] = 0x2f;
}
break;
}
}
return rdesc;
}
static const struct hid_device_id holtek_mouse_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
{ }
};
MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
static struct hid_driver holtek_mouse_driver = {
.name = "holtek_mouse",
.id_table = holtek_mouse_devices,
.report_fixup = holtek_mouse_report_fixup,
};
module_hid_driver(holtek_mouse_driver);
MODULE_LICENSE("GPL");
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