50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Fix for Trust Philips SPK6327 (145f:024b)
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* Modifier keys report as Array (0x00) instead of Variable (0x02)
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* causing LCtrl, LAlt, Super etc. to all act as LShift
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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_TRUST 0x145F
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#define PID_SPK6327 0x024B
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HID_BPF_CONFIG(
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HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_TRUST, PID_SPK6327)
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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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__u8 *data = hid_bpf_get_data(hctx, 0, 4096);
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if (!data)
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return 0;
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/* Fix modifier keys: Input Array (0x00) -> Input Variable (0x02) */
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if (data[101] == 0x00)
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data[101] = 0x02;
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return 0;
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}
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HID_BPF_OPS(trust_spk6327) = {
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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 apply to interface 1 (169 bytes) not interface 0 (62 bytes) */
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if (ctx->rdesc_size == 169)
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ctx->retval = 0;
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else
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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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