tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
HID: bpf: add in-tree HID-BPF fix for the Raptor Mach 2
This device is already fixed by "HID: do not assume HAT Switch
logical max < 8", but for people without the fix already, having the
HID-BPF locally can fix the device while they wait for their
distribution to update.
Link: https://lore.kernel.org/r/20240410-bpf_sources-v1-9-a8bf16033ef8@kernel.org
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
+185
+185
drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
+185
drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
···
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2024 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_BETOP_2185PC 0x11C0
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#define PID_RAPTOR_MACH_2 0x5606
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HID_BPF_CONFIG(
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HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_BETOP_2185PC, PID_RAPTOR_MACH_2),
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);
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/*
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* For reference, this is the fixed report descriptor
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*
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* static const __u8 fixed_rdesc[] = {
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* 0x05, 0x01, // Usage Page (Generic Desktop) 0
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* 0x09, 0x04, // Usage (Joystick) 2
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* 0xa1, 0x01, // Collection (Application) 4
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* 0x05, 0x01, // Usage Page (Generic Desktop) 6
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* 0x85, 0x01, // Report ID (1) 8
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* 0x05, 0x01, // Usage Page (Generic Desktop) 10
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* 0x09, 0x30, // Usage (X) 12
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* 0x75, 0x10, // Report Size (16) 14
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* 0x95, 0x01, // Report Count (1) 16
30
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* 0x15, 0x00, // Logical Minimum (0) 18
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* 0x26, 0xff, 0x07, // Logical Maximum (2047) 20
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* 0x46, 0xff, 0x07, // Physical Maximum (2047) 23
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* 0x81, 0x02, // Input (Data,Var,Abs) 26
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* 0x05, 0x01, // Usage Page (Generic Desktop) 28
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* 0x09, 0x31, // Usage (Y) 30
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* 0x75, 0x10, // Report Size (16) 32
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* 0x95, 0x01, // Report Count (1) 34
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* 0x15, 0x00, // Logical Minimum (0) 36
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* 0x26, 0xff, 0x07, // Logical Maximum (2047) 38
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* 0x46, 0xff, 0x07, // Physical Maximum (2047) 41
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* 0x81, 0x02, // Input (Data,Var,Abs) 44
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* 0x05, 0x01, // Usage Page (Generic Desktop) 46
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* 0x09, 0x33, // Usage (Rx) 48
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* 0x75, 0x10, // Report Size (16) 50
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* 0x95, 0x01, // Report Count (1) 52
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* 0x15, 0x00, // Logical Minimum (0) 54
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* 0x26, 0xff, 0x03, // Logical Maximum (1023) 56
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* 0x46, 0xff, 0x03, // Physical Maximum (1023) 59
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* 0x81, 0x02, // Input (Data,Var,Abs) 62
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* 0x05, 0x00, // Usage Page (Undefined) 64
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* 0x09, 0x00, // Usage (Undefined) 66
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* 0x75, 0x10, // Report Size (16) 68
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* 0x95, 0x01, // Report Count (1) 70
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* 0x15, 0x00, // Logical Minimum (0) 72
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* 0x26, 0xff, 0x03, // Logical Maximum (1023) 74
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* 0x46, 0xff, 0x03, // Physical Maximum (1023) 77
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* 0x81, 0x02, // Input (Data,Var,Abs) 80
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* 0x05, 0x01, // Usage Page (Generic Desktop) 82
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* 0x09, 0x32, // Usage (Z) 84
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* 0x75, 0x10, // Report Size (16) 86
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* 0x95, 0x01, // Report Count (1) 88
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* 0x15, 0x00, // Logical Minimum (0) 90
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* 0x26, 0xff, 0x03, // Logical Maximum (1023) 92
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* 0x46, 0xff, 0x03, // Physical Maximum (1023) 95
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* 0x81, 0x02, // Input (Data,Var,Abs) 98
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* 0x05, 0x01, // Usage Page (Generic Desktop) 100
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* 0x09, 0x35, // Usage (Rz) 102
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* 0x75, 0x10, // Report Size (16) 104
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* 0x95, 0x01, // Report Count (1) 106
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* 0x15, 0x00, // Logical Minimum (0) 108
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* 0x26, 0xff, 0x03, // Logical Maximum (1023) 110
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* 0x46, 0xff, 0x03, // Physical Maximum (1023) 113
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* 0x81, 0x02, // Input (Data,Var,Abs) 116
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* 0x05, 0x01, // Usage Page (Generic Desktop) 118
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* 0x09, 0x34, // Usage (Ry) 120
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* 0x75, 0x10, // Report Size (16) 122
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* 0x95, 0x01, // Report Count (1) 124
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* 0x15, 0x00, // Logical Minimum (0) 126
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* 0x26, 0xff, 0x07, // Logical Maximum (2047) 128
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* 0x46, 0xff, 0x07, // Physical Maximum (2047) 131
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* 0x81, 0x02, // Input (Data,Var,Abs) 134
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* 0x05, 0x01, // Usage Page (Generic Desktop) 136
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* 0x09, 0x36, // Usage (Slider) 138
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* 0x75, 0x10, // Report Size (16) 140
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* 0x95, 0x01, // Report Count (1) 142
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* 0x15, 0x00, // Logical Minimum (0) 144
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* 0x26, 0xff, 0x03, // Logical Maximum (1023) 146
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* 0x46, 0xff, 0x03, // Physical Maximum (1023) 149
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* 0x81, 0x02, // Input (Data,Var,Abs) 152
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* 0x05, 0x09, // Usage Page (Button) 154
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* 0x19, 0x01, // Usage Minimum (1) 156
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* 0x2a, 0x1d, 0x00, // Usage Maximum (29) 158
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* 0x15, 0x00, // Logical Minimum (0) 161
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* 0x25, 0x01, // Logical Maximum (1) 163
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* 0x75, 0x01, // Report Size (1) 165
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* 0x96, 0x80, 0x00, // Report Count (128) 167
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* 0x81, 0x02, // Input (Data,Var,Abs) 170
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* 0x05, 0x01, // Usage Page (Generic Desktop) 172
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* 0x09, 0x39, // Usage (Hat switch) 174
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* 0x26, 0x07, 0x00, // Logical Maximum (7) 176 // changed (was 239)
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* 0x46, 0x68, 0x01, // Physical Maximum (360) 179
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* 0x65, 0x14, // Unit (EnglishRotation: deg) 182
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* 0x75, 0x10, // Report Size (16) 184
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* 0x95, 0x01, // Report Count (1) 186
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* 0x81, 0x42, // Input (Data,Var,Abs,Null) 188
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* 0x05, 0x01, // Usage Page (Generic Desktop) 190
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* 0x09, 0x00, // Usage (Undefined) 192
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* 0x75, 0x08, // Report Size (8) 194
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* 0x95, 0x1d, // Report Count (29) 196
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* 0x81, 0x01, // Input (Cnst,Arr,Abs) 198
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* 0x15, 0x00, // Logical Minimum (0) 200
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* 0x26, 0xef, 0x00, // Logical Maximum (239) 202
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* 0x85, 0x58, // Report ID (88) 205
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* 0x26, 0xff, 0x00, // Logical Maximum (255) 207
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* 0x46, 0xff, 0x00, // Physical Maximum (255) 210
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* 0x75, 0x08, // Report Size (8) 213
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* 0x95, 0x3f, // Report Count (63) 215
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* 0x09, 0x00, // Usage (Undefined) 217
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* 0x91, 0x02, // Output (Data,Var,Abs) 219
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* 0x85, 0x59, // Report ID (89) 221
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* 0x75, 0x08, // Report Size (8) 223
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* 0x95, 0x80, // Report Count (128) 225
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* 0x09, 0x00, // Usage (Undefined) 227
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* 0xb1, 0x02, // Feature (Data,Var,Abs) 229
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* 0xc0, // End Collection 231
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* };
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*/
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/*
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* We need to amend the report descriptor for the following:
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* - the joystick sends its hat_switch data between 0 and 239 but
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* the kernel expects the logical max to stick into a signed 8 bits
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* integer. We thus divide it by 30 to match what other joysticks are
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* doing
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*/
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SEC("fmod_ret/hid_bpf_rdesc_fixup")
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int BPF_PROG(hid_fix_rdesc_raptor_mach_2, struct hid_bpf_ctx *hctx)
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{
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__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, HID_MAX_DESCRIPTOR_SIZE /* size */);
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if (!data)
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return 0; /* EPERM check */
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data[177] = 0x07;
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return 0;
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}
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/*
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* The hat_switch value at offsets 33 and 34 (16 bits) needs
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* to be reduced to a single 8 bit signed integer. So we
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* divide it by 30.
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* Byte 34 is always null, so it is ignored.
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*/
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SEC("fmod_ret/hid_bpf_device_event")
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int BPF_PROG(raptor_mach_2_fix_hat_switch, struct hid_bpf_ctx *hctx)
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{
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__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 64 /* size */);
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if (!data)
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return 0; /* EPERM check */
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if (data[0] != 0x01) /* not the joystick report ID */
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return 0;
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data[33] /= 30;
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return 0;
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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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ctx->retval = ctx->rdesc_size != 232;
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if (ctx->retval)
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ctx->retval = -EINVAL;
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/* ensure the kernel isn't fixed already */
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if (ctx->rdesc[177] != 0xef) /* Logical Max of 239 */
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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";