1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *  HID driver for Topre REALFORCE Keyboards
4 *
5 *  Copyright (c) 2022 Harry Stern <harry@harrystern.net>
6 *
7 *  Based on the hid-macally driver
8 */
9
10#include <linux/hid.h>
11#include <linux/module.h>
12
13#include "hid-ids.h"
14
15MODULE_AUTHOR("Harry Stern <harry@harrystern.net>");
16MODULE_DESCRIPTION("REALFORCE R2 Keyboard driver");
17MODULE_LICENSE("GPL");
18
19/*
20 * Fix the REALFORCE R2's non-boot interface's report descriptor to match the
21 * events it's actually sending. It claims to send array events but is instead
22 * sending variable events.
23 */
24static __u8 *topre_report_fixup(struct hid_device *hdev, __u8 *rdesc,
25				 unsigned int *rsize)
26{
27	if (*rsize >= 119 && rdesc[69] == 0x29 && rdesc[70] == 0xe7 &&
28						 rdesc[71] == 0x81 && rdesc[72] == 0x00) {
29		hid_info(hdev,
30			"fixing up Topre REALFORCE keyboard report descriptor\n");
31		rdesc[72] = 0x02;
32	}
33	return rdesc;
34}
35
36static const struct hid_device_id topre_id_table[] = {
37	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
38			 USB_DEVICE_ID_TOPRE_REALFORCE_R2_108) },
39	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
40			 USB_DEVICE_ID_TOPRE_REALFORCE_R2_87) },
41	{ }
42};
43MODULE_DEVICE_TABLE(hid, topre_id_table);
44
45static struct hid_driver topre_driver = {
46	.name			= "topre",
47	.id_table		= topre_id_table,
48	.report_fixup		= topre_report_fixup,
49};
50
51module_hid_driver(topre_driver);
52