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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright (c) 2025 TUXEDO Computers GmbH
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*/
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#include "vmlinux.h"
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#include "hid_bpf.h"
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#include "hid_bpf_helpers.h"
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#include <bpf/bpf_tracing.h>
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HID_BPF_CONFIG(
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HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, 0x048D, 0x8910)
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);
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SEC(HID_BPF_DEVICE_EVENT)
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int BPF_PROG(ignore_key_fix_event, struct hid_bpf_ctx *hid_ctx)
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{
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const int expected_length = 37;
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const int expected_report_id = 1;
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__u8 *data;
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int i;
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if (hid_ctx->size < expected_length)
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return 0;
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data = hid_bpf_get_data(hid_ctx, 0, expected_length);
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if (!data || data[0] != expected_report_id)
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return 0;
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// Zero out F13 (HID usage ID: 0x68) key press.
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// The first 6 parallel key presses (excluding modifier keys) are
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// encoded in an array containing usage IDs.
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for (i = 3; i < 9; ++i)
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if (data[i] == 0x68)
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data[i] = 0x00;
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// Additional parallel key presses starting with the 7th (excluding
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// modifier keys) are encoded as a bit flag with the offset being
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// the usage ID.
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data[22] &= 0xfe;
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return 0;
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}
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HID_BPF_OPS(ignore_button) = {
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.hid_device_event = (void *)ignore_key_fix_event,
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};
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char _license[] SEC("license") = "GPL";
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