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-redragon.c (1435B)

      1/*
      2 *  HID driver for Redragon keyboards
      3 *
      4 *  Copyright (c) 2017 Robert Munteanu
      5 *  SPDX-License-Identifier: GPL-2.0+
      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/device.h>
     16#include <linux/hid.h>
     17#include <linux/module.h>
     18
     19#include "hid-ids.h"
     20
     21
     22/*
     23 * The Redragon Asura keyboard sends an incorrect HID descriptor.
     24 * At byte 100 it contains
     25 *
     26 *   0x81, 0x00
     27 *
     28 * which is Input (Data, Arr, Abs), but it should be
     29 *
     30 *   0x81, 0x02
     31 *
     32 * which is Input (Data, Var, Abs), which is consistent with the way
     33 * key codes are generated.
     34 */
     35
     36static __u8 *redragon_report_fixup(struct hid_device *hdev, __u8 *rdesc,
     37	unsigned int *rsize)
     38{
     39	if (*rsize >= 102 && rdesc[100] == 0x81 && rdesc[101] == 0x00) {
     40		dev_info(&hdev->dev, "Fixing Redragon ASURA report descriptor.\n");
     41		rdesc[101] = 0x02;
     42	}
     43
     44	return rdesc;
     45}
     46
     47static const struct hid_device_id redragon_devices[] = {
     48	{HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)},
     49	{}
     50};
     51
     52MODULE_DEVICE_TABLE(hid, redragon_devices);
     53
     54static struct hid_driver redragon_driver = {
     55	.name = "redragon",
     56	.id_table = redragon_devices,
     57	.report_fixup = redragon_report_fixup
     58};
     59
     60module_hid_driver(redragon_driver);
     61
     62MODULE_LICENSE("GPL");