hid-topre.c

 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 const __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	} else if (*rsize >= 106 && rdesc[28] == 0x29 && rdesc[29] == 0xe7 &&
33				    rdesc[30] == 0x81 && rdesc[31] == 0x00) {
34		hid_info(hdev,
35			"fixing up Topre REALFORCE keyboard report descriptor\n");
36		rdesc[31] = 0x02;
37	}
38	return rdesc;
39}
40
41static const struct hid_device_id topre_id_table[] = {
42	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
43			 USB_DEVICE_ID_TOPRE_REALFORCE_R2_108) },
44	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
45			 USB_DEVICE_ID_TOPRE_REALFORCE_R2_87) },
46	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
47			 USB_DEVICE_ID_TOPRE_REALFORCE_R3S_87) },
48	{ }
49};
50MODULE_DEVICE_TABLE(hid, topre_id_table);
51
52static struct hid_driver topre_driver = {
53	.name			= "topre",
54	.id_table		= topre_id_table,
55	.report_fixup		= topre_report_fixup,
56};
57
58module_hid_driver(topre_driver);