64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2023 Benjamin Tissoires
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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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#define VID_IOGEAR 0x258A /* VID is shared with SinoWealth and Glorious and prob others */
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#define PID_MOMENTUM 0x0027
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HID_BPF_CONFIG(
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HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_IOGEAR, PID_MOMENTUM)
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);
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/*
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* The IOGear Kaliber Gaming MMOmentum Pro mouse has multiple buttons (12)
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* but only 5 are accessible out of the box because the report descriptor
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* marks the other buttons as constants.
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* We just fix the report descriptor to enable those missing 7 buttons.
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*/
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SEC(HID_BPF_RDESC_FIXUP)
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int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
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{
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const u8 offsets[] = {84, 112, 140};
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__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
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if (!data)
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return 0; /* EPERM check */
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/* if not Keyboard */
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if (data[3] != 0x06)
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return 0;
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for (int idx = 0; idx < ARRAY_SIZE(offsets); idx++) {
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u8 offset = offsets[idx];
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/* if Input (Cnst,Var,Abs) , make it Input (Data,Var,Abs) */
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if (data[offset] == 0x81 && data[offset + 1] == 0x03)
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data[offset + 1] = 0x02;
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}
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return 0;
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}
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HID_BPF_OPS(iogear_kaliber_momentum) = {
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.hid_rdesc_fixup = (void *)hid_fix_rdesc,
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};
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SEC("syscall")
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int probe(struct hid_bpf_probe_args *ctx)
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{
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/* only bind to the keyboard interface */
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ctx->retval = ctx->rdesc_size != 213;
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if (ctx->retval)
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ctx->retval = -EINVAL;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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