149 lines
6.9 KiB
C
149 lines
6.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2024 José Expósito
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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_RAPOO 0x24AE
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#define PID_M50 0x2015
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#define RDESC_SIZE 186
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HID_BPF_CONFIG(
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HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_RAPOO, PID_M50)
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);
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/*
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* The Rapoo M50 Plus Silent mouse has 2 side buttons in addition to the left,
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* right and middle buttons. However, its original HID descriptor has a Usage
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* Maximum of 3, preventing the side buttons to work. This HID-BPF driver
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* changes that usage to 5.
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*
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* For reference, this is the original report descriptor:
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*
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* 0x05, 0x01, // Usage Page (Generic Desktop) 0
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* 0x09, 0x02, // Usage (Mouse) 2
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* 0xa1, 0x01, // Collection (Application) 4
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* 0x85, 0x01, // Report ID (1) 6
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* 0x09, 0x01, // Usage (Pointer) 8
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* 0xa1, 0x00, // Collection (Physical) 10
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* 0x05, 0x09, // Usage Page (Button) 12
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* 0x19, 0x01, // Usage Minimum (1) 14
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* 0x29, 0x03, // Usage Maximum (3) 16 <- change to 0x05
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* 0x15, 0x00, // Logical Minimum (0) 18
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* 0x25, 0x01, // Logical Maximum (1) 20
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* 0x75, 0x01, // Report Size (1) 22
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* 0x95, 0x05, // Report Count (5) 24
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* 0x81, 0x02, // Input (Data,Var,Abs) 26
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* 0x75, 0x03, // Report Size (3) 28
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* 0x95, 0x01, // Report Count (1) 30
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* 0x81, 0x01, // Input (Cnst,Arr,Abs) 32
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* 0x05, 0x01, // Usage Page (Generic Desktop) 34
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* 0x09, 0x30, // Usage (X) 36
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* 0x09, 0x31, // Usage (Y) 38
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* 0x16, 0x01, 0x80, // Logical Minimum (-32767) 40
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* 0x26, 0xff, 0x7f, // Logical Maximum (32767) 43
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* 0x75, 0x10, // Report Size (16) 46
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* 0x95, 0x02, // Report Count (2) 48
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* 0x81, 0x06, // Input (Data,Var,Rel) 50
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* 0x09, 0x38, // Usage (Wheel) 52
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* 0x15, 0x81, // Logical Minimum (-127) 54
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* 0x25, 0x7f, // Logical Maximum (127) 56
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* 0x75, 0x08, // Report Size (8) 58
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* 0x95, 0x01, // Report Count (1) 60
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* 0x81, 0x06, // Input (Data,Var,Rel) 62
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* 0xc0, // End Collection 64
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* 0xc0, // End Collection 65
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* 0x05, 0x0c, // Usage Page (Consumer Devices) 66
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* 0x09, 0x01, // Usage (Consumer Control) 68
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* 0xa1, 0x01, // Collection (Application) 70
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* 0x85, 0x02, // Report ID (2) 72
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* 0x75, 0x10, // Report Size (16) 74
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* 0x95, 0x01, // Report Count (1) 76
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* 0x15, 0x01, // Logical Minimum (1) 78
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* 0x26, 0x8c, 0x02, // Logical Maximum (652) 80
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* 0x19, 0x01, // Usage Minimum (1) 83
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* 0x2a, 0x8c, 0x02, // Usage Maximum (652) 85
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* 0x81, 0x00, // Input (Data,Arr,Abs) 88
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* 0xc0, // End Collection 90
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* 0x05, 0x01, // Usage Page (Generic Desktop) 91
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* 0x09, 0x80, // Usage (System Control) 93
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* 0xa1, 0x01, // Collection (Application) 95
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* 0x85, 0x03, // Report ID (3) 97
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* 0x09, 0x82, // Usage (System Sleep) 99
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* 0x09, 0x81, // Usage (System Power Down) 101
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* 0x09, 0x83, // Usage (System Wake Up) 103
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* 0x15, 0x00, // Logical Minimum (0) 105
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* 0x25, 0x01, // Logical Maximum (1) 107
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* 0x19, 0x01, // Usage Minimum (1) 109
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* 0x29, 0x03, // Usage Maximum (3) 111
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* 0x75, 0x01, // Report Size (1) 113
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* 0x95, 0x03, // Report Count (3) 115
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* 0x81, 0x02, // Input (Data,Var,Abs) 117
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* 0x95, 0x05, // Report Count (5) 119
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* 0x81, 0x01, // Input (Cnst,Arr,Abs) 121
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* 0xc0, // End Collection 123
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* 0x05, 0x01, // Usage Page (Generic Desktop) 124
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* 0x09, 0x00, // Usage (Undefined) 126
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* 0xa1, 0x01, // Collection (Application) 128
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* 0x85, 0x05, // Report ID (5) 130
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* 0x06, 0x00, 0xff, // Usage Page (Vendor Defined Page 1) 132
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* 0x09, 0x01, // Usage (Vendor Usage 1) 135
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* 0x15, 0x81, // Logical Minimum (-127) 137
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* 0x25, 0x7f, // Logical Maximum (127) 139
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* 0x75, 0x08, // Report Size (8) 141
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* 0x95, 0x07, // Report Count (7) 143
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* 0xb1, 0x02, // Feature (Data,Var,Abs) 145
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* 0xc0, // End Collection 147
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* 0x06, 0x00, 0xff, // Usage Page (Vendor Defined Page 1) 148
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* 0x09, 0x0e, // Usage (Vendor Usage 0x0e) 151
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* 0xa1, 0x01, // Collection (Application) 153
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* 0x85, 0xba, // Report ID (186) 155
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* 0x95, 0x1f, // Report Count (31) 157
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* 0x75, 0x08, // Report Size (8) 159
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* 0x26, 0xff, 0x00, // Logical Maximum (255) 161
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* 0x15, 0x00, // Logical Minimum (0) 164
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* 0x09, 0x01, // Usage (Vendor Usage 1) 166
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* 0x91, 0x02, // Output (Data,Var,Abs) 168
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* 0x85, 0xba, // Report ID (186) 170
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* 0x95, 0x1f, // Report Count (31) 172
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* 0x75, 0x08, // Report Size (8) 174
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* 0x26, 0xff, 0x00, // Logical Maximum (255) 176
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* 0x15, 0x00, // Logical Minimum (0) 179
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* 0x09, 0x01, // Usage (Vendor Usage 1) 181
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* 0x81, 0x02, // Input (Data,Var,Abs) 183
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* 0xc0, // End Collection 185
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*/
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SEC(HID_BPF_RDESC_FIXUP)
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int BPF_PROG(hid_rdesc_fixup_rapoo_m50, struct hid_bpf_ctx *hctx)
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{
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__u8 *data = hid_bpf_get_data(hctx, 0, HID_MAX_DESCRIPTOR_SIZE);
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if (!data)
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return 0; /* EPERM check */
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if (data[17] == 0x03)
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data[17] = 0x05;
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return 0;
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}
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HID_BPF_OPS(rapoo_m50) = {
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.hid_rdesc_fixup = (void *)hid_rdesc_fixup_rapoo_m50,
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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 != RDESC_SIZE;
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if (ctx->retval)
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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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