1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Fix for Trust Philips SPK6327 (145f:024b) 3 * Modifier keys report as Array (0x00) instead of Variable (0x02) 4 * causing LCtrl, LAlt, Super etc. to all act as LShift 5 */ 6 #include "vmlinux.h" 7 #include "hid_bpf.h" 8 #include "hid_bpf_helpers.h" 9 #include <bpf/bpf_tracing.h> 10 11 #define VID_TRUST 0x145F 12 #define PID_SPK6327 0x024B 13 14 HID_BPF_CONFIG( 15 HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_TRUST, PID_SPK6327) 16 ); 17 18 SEC(HID_BPF_RDESC_FIXUP) 19 int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx) 20 { 21 __u8 *data = hid_bpf_get_data(hctx, 0, 4096); 22 23 if (!data) 24 return 0; 25 26 /* Fix modifier keys: Input Array (0x00) -> Input Variable (0x02) */ 27 if (data[101] == 0x00) 28 data[101] = 0x02; 29 30 return 0; 31 } 32 33 HID_BPF_OPS(trust_spk6327) = { 34 .hid_rdesc_fixup = (void *)hid_fix_rdesc, 35 }; 36 37 SEC("syscall") 38 int probe(struct hid_bpf_probe_args *ctx) 39 { 40 /* Only apply to interface 1 (169 bytes) not interface 0 (62 bytes) */ 41 if (ctx->rdesc_size == 169) 42 ctx->retval = 0; 43 else 44 ctx->retval = -EINVAL; 45 46 return 0; 47 } 48 49 char _license[] SEC("license") = "GPL"; 50