From 0bc8f89f40403cfbc3c6e676b0bee240a9349d3f Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Wed, 10 Apr 2024 19:19:25 +0200 Subject: [PATCH] HID: bpf: add in-tree HID-BPF fix for the IOGear Kaliber Gaming MMOmentum mouse Allows to export more than 5 buttons on this 12 buttons mouse. Link: https://lore.kernel.org/r/20240410-bpf_sources-v1-5-a8bf16033ef8@kernel.org Reviewed-by: Peter Hutterer Signed-off-by: Benjamin Tissoires --- .../bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c | 59 +++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c diff --git a/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c new file mode 100644 index 000000000000..225cbefdbf0e --- /dev/null +++ b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c @@ -0,0 +1,59 @@ +// 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 + +#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";