hid_mouse.c (9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e) hid_mouse.c (e342d6f6f7d82b48c4540b947d8032a3b7b3e6f8)
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2022 Benjamin Tissoires
3 *
4 * This is a pure HID-BPF example, and should be considered as such:
5 * on the Etekcity Scroll 6E, the X and Y axes will be swapped and
6 * inverted. On any other device... Not sure what this will do.
7 *
8 * This C main file is generic though. To adapt the code and test, users

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24
25#include <linux/bpf.h>
26#include <linux/errno.h>
27
28#include <bpf/bpf.h>
29#include <bpf/libbpf.h>
30
31#include "hid_mouse.skel.h"
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2022 Benjamin Tissoires
3 *
4 * This is a pure HID-BPF example, and should be considered as such:
5 * on the Etekcity Scroll 6E, the X and Y axes will be swapped and
6 * inverted. On any other device... Not sure what this will do.
7 *
8 * This C main file is generic though. To adapt the code and test, users

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24
25#include <linux/bpf.h>
26#include <linux/errno.h>
27
28#include <bpf/bpf.h>
29#include <bpf/libbpf.h>
30
31#include "hid_mouse.skel.h"
32#include "hid_bpf_attach.h"
33
34static bool running = true;
35
36static void int_exit(int sig)
37{
38 running = false;
39 exit(0);
40}

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71
72 str_id = dir + sizeof("0003:0001:0A37.");
73 return (int)strtol(str_id, NULL, 16);
74}
75
76int main(int argc, char **argv)
77{
78 struct hid_mouse *skel;
32
33static bool running = true;
34
35static void int_exit(int sig)
36{
37 running = false;
38 exit(0);
39}

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70
71 str_id = dir + sizeof("0003:0001:0A37.");
72 return (int)strtol(str_id, NULL, 16);
73}
74
75int main(int argc, char **argv)
76{
77 struct hid_mouse *skel;
79 struct bpf_program *prog;
78 struct bpf_link *link;
80 int err;
81 const char *optstr = "";
82 const char *sysfs_path;
79 int err;
80 const char *optstr = "";
81 const char *sysfs_path;
83 int opt, hid_id, attach_fd;
84 struct attach_prog_args args = {
85 .retval = -1,
86 };
87 DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
88 .ctx_in = &args,
89 .ctx_size_in = sizeof(args),
90 );
82 int opt, hid_id;
91
92 while ((opt = getopt(argc, argv, optstr)) != -1) {
93 switch (opt) {
94 default:
95 usage(basename(argv[0]));
96 return 1;
97 }
98 }

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103 }
104
105 sysfs_path = argv[optind];
106 if (!sysfs_path) {
107 perror("sysfs");
108 return 1;
109 }
110
83
84 while ((opt = getopt(argc, argv, optstr)) != -1) {
85 switch (opt) {
86 default:
87 usage(basename(argv[0]));
88 return 1;
89 }
90 }

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95 }
96
97 sysfs_path = argv[optind];
98 if (!sysfs_path) {
99 perror("sysfs");
100 return 1;
101 }
102
111 skel = hid_mouse__open_and_load();
103 skel = hid_mouse__open();
112 if (!skel) {
113 fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
114 return -1;
115 }
116
117 hid_id = get_hid_id(sysfs_path);
118
119 if (hid_id < 0) {
120 fprintf(stderr, "can not open HID device: %m\n");
121 return 1;
122 }
104 if (!skel) {
105 fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
106 return -1;
107 }
108
109 hid_id = get_hid_id(sysfs_path);
110
111 if (hid_id < 0) {
112 fprintf(stderr, "can not open HID device: %m\n");
113 return 1;
114 }
123 args.hid = hid_id;
115 skel->struct_ops.mouse_invert->hid_id = hid_id;
124
116
125 attach_fd = bpf_program__fd(skel->progs.attach_prog);
126 if (attach_fd < 0) {
127 fprintf(stderr, "can't locate attach prog: %m\n");
117 err = hid_mouse__load(skel);
118 if (err < 0) {
119 fprintf(stderr, "can not load HID-BPF program: %m\n");
128 return 1;
129 }
130
120 return 1;
121 }
122
131 bpf_object__for_each_program(prog, *skel->skeleton->obj) {
132 /* ignore syscalls */
133 if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
134 continue;
135
136 args.retval = -1;
137 args.prog_fd = bpf_program__fd(prog);
138 err = bpf_prog_test_run_opts(attach_fd, &tattr);
139 if (err) {
140 fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
141 hid_id, err);
142 return 1;
143 }
123 link = bpf_map__attach_struct_ops(skel->maps.mouse_invert);
124 if (!link) {
125 fprintf(stderr, "can not attach HID-BPF program: %m\n");
126 return 1;
144 }
145
146 signal(SIGINT, int_exit);
147 signal(SIGTERM, int_exit);
148
149 while (running)
150 sleep(1);
151
152 hid_mouse__destroy(skel);
153
154 return 0;
155}
127 }
128
129 signal(SIGINT, int_exit);
130 signal(SIGTERM, int_exit);
131
132 while (running)
133 sleep(1);
134
135 hid_mouse__destroy(skel);
136
137 return 0;
138}