TUXEDO__Sirius-16-Gen1-and-Gen2.bpf.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/* Copyright (c) 2025 TUXEDO Computers GmbH
 3 */
 4
 5#include "vmlinux.h"
 6#include "hid_bpf.h"
 7#include "hid_bpf_helpers.h"
 8#include <bpf/bpf_tracing.h>
 9
10HID_BPF_CONFIG(
11	HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, 0x048D, 0x8910)
12);
13
14SEC(HID_BPF_DEVICE_EVENT)
15int BPF_PROG(ignore_key_fix_event, struct hid_bpf_ctx *hid_ctx)
16{
17	const int expected_length = 37;
18	const int expected_report_id = 1;
19	__u8 *data;
20	int i;
21
22	if (hid_ctx->size < expected_length)
23		return 0;
24
25	data = hid_bpf_get_data(hid_ctx, 0, expected_length);
26	if (!data || data[0] != expected_report_id)
27		return 0;
28
29	// Zero out F13 (HID usage ID: 0x68) key press.
30	// The first 6 parallel key presses (excluding modifier keys) are
31	// encoded in an array containing usage IDs.
32	for (i = 3; i < 9; ++i)
33		if (data[i] == 0x68)
34			data[i] = 0x00;
35	// Additional parallel key presses starting with the 7th (excluding
36	// modifier keys) are encoded as a bit flag with the offset being
37	// the usage ID.
38	data[22] &= 0xfe;
39
40	return 0;
41}
42
43HID_BPF_OPS(ignore_button) = {
44	.hid_device_event = (void *)ignore_key_fix_event,
45};
46
47char _license[] SEC("license") = "GPL";