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 | |
36 | static __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 | |
47 | static const struct hid_device_id redragon_devices[] = { |
48 | {HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)}, |
49 | {} |
50 | }; |
51 | |
52 | MODULE_DEVICE_TABLE(hid, redragon_devices); |
53 | |
54 | static struct hid_driver redragon_driver = { |
55 | .name = "redragon" , |
56 | .id_table = redragon_devices, |
57 | .report_fixup = redragon_report_fixup |
58 | }; |
59 | |
60 | module_hid_driver(redragon_driver); |
61 | |
62 | MODULE_LICENSE("GPL" ); |
63 | |