Merge tag 'driver-core-6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-rpi.git] / drivers / hid / 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
15 MODULE_AUTHOR("Harry Stern <harry@harrystern.net>");
16 MODULE_DESCRIPTION("REALFORCE R2 Keyboard driver");
17 MODULE_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  */
24 static __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
36 static 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         { }
40 };
41 MODULE_DEVICE_TABLE(hid, topre_id_table);
42
43 static struct hid_driver topre_driver = {
44         .name                   = "topre",
45         .id_table               = topre_id_table,
46         .report_fixup           = topre_report_fixup,
47 };
48
49 module_hid_driver(topre_driver);