64 lines · c
1/*2 * HID driver for Redragon keyboards3 *4 * Copyright (c) 2017 Robert Munteanu5 * SPDX-License-Identifier: GPL-2.0+6 */7 8/*9 * This program is free software; you can redistribute it and/or modify it10 * under the terms of the GNU General Public License as published by the Free11 * 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 contains25 *26 * 0x81, 0x0027 *28 * which is Input (Data, Arr, Abs), but it should be29 *30 * 0x81, 0x0231 *32 * which is Input (Data, Var, Abs), which is consistent with the way33 * key codes are generated.34 */35 36static const __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_fixup58};59 60module_hid_driver(redragon_driver);61 62MODULE_DESCRIPTION("HID driver for Redragon keyboards");63MODULE_LICENSE("GPL");64