cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-holtek-mouse.c (3341B)

      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
     32static __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
     65static int holtek_mouse_probe(struct hid_device *hdev,
     66			      const struct hid_device_id *id)
     67{
     68	int ret;
     69
     70	if (!hid_is_usb(hdev))
     71		return -EINVAL;
     72
     73	ret = hid_parse(hdev);
     74	if (ret) {
     75		hid_err(hdev, "hid parse failed: %d\n", ret);
     76		return ret;
     77	}
     78
     79	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
     80	if (ret) {
     81		hid_err(hdev, "hw start failed: %d\n", ret);
     82		return ret;
     83	}
     84
     85	return 0;
     86}
     87
     88static const struct hid_device_id holtek_mouse_devices[] = {
     89	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
     90			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
     91        { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
     92			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070) },
     93	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
     94			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
     95	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
     96			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072) },
     97	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
     98			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },
     99	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
    100			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2) },
    101	{ }
    102};
    103MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
    104
    105static struct hid_driver holtek_mouse_driver = {
    106	.name = "holtek_mouse",
    107	.id_table = holtek_mouse_devices,
    108	.report_fixup = holtek_mouse_report_fixup,
    109	.probe = holtek_mouse_probe,
    110};
    111
    112module_hid_driver(holtek_mouse_driver);
    113MODULE_LICENSE("GPL");