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