summaryrefslogtreecommitdiff
path: root/src/udev/udev-builtin-keyboard.c
blob: 2deb8b9fbb4aa9e08acc6418c2c7f686af1f765e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/***
  This file is part of systemd.

  Copyright 2013 Kay Sievers <kay@vrfy.org>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/limits.h>
#include <linux/input.h>

#include "udev.h"

static const struct key *keyboard_lookup_key(const char *str, unsigned int len);
#include "keyboard-keys-from-name.h"
#include "keyboard-keys-to-name.h"

static int install_force_release(struct udev_device *dev, const unsigned int *release, unsigned int release_count) {
        struct udev_device *atkbd;
        const char *cur;
        char codes[4096];
        char *s;
        size_t l;
        unsigned int i;
        int ret;

        atkbd = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
        if (!atkbd)
                return -ENODEV;

        cur = udev_device_get_sysattr_value(atkbd, "force_release");
        if (!cur)
                return -ENODEV;

        s = codes;
        l = sizeof(codes);

        /* copy current content */
        l = strpcpy(&s, l, cur);

        /* append new codes */
        for (i = 0; i < release_count; i++)
                l = strpcpyf(&s, l, ",%d", release[i]);

        log_debug("keyboard: updating force-release list with '%s'", codes);
        ret = udev_device_set_sysattr_value(atkbd, "force_release", codes);
        if (ret < 0)
                log_error_errno(ret, "Error writing force-release attribute: %m");
        return ret;
}

static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], bool test) {
        struct udev_list_entry *entry;
        struct {
                unsigned int scan;
                unsigned int key;
        } map[1024];
        unsigned int map_count = 0;
        unsigned int release[1024];
        unsigned int release_count = 0;

        udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
                const char *key;
                unsigned int scancode, keycode_num;
                char *endptr;
                const char *keycode;
                const struct key *k;

                key = udev_list_entry_get_name(entry);
                if (!startswith(key, "KEYBOARD_KEY_"))
                        continue;

                /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
                scancode = strtoul(key + 13, &endptr, 16);
                if (endptr[0] != '\0') {
                        log_error("Error, unable to parse scan code from '%s'", key);
                        continue;
                }

                keycode = udev_list_entry_get_value(entry);

                /* a leading '!' needs a force-release entry */
                if (keycode[0] == '!') {
                        keycode++;

                        release[release_count] = scancode;
                        if (release_count <  ELEMENTSOF(release)-1)
                                release_count++;

                        if (keycode[0] == '\0')
                                continue;
                }

                /* translate identifier to key code */
                k = keyboard_lookup_key(keycode, strlen(keycode));
                if (k) {
                        keycode_num = k->id;
                } else {
                        /* check if it's a numeric code already */
                        keycode_num = strtoul(keycode, &endptr, 0);
                        if (endptr[0] !='\0') {
                                log_error("Error, unknown key identifier '%s'", keycode);
                                continue;
                        }
                }

                map[map_count].scan = scancode;
                map[map_count].key = keycode_num;
                if (map_count < ELEMENTSOF(map)-1)
                        map_count++;
        }

        if (map_count > 0 || release_count > 0) {
                const char *node;
                int fd;
                unsigned int i;

                node = udev_device_get_devnode(dev);
                if (!node) {
                        log_error("Error, no device node for '%s'", udev_device_get_syspath(dev));
                        return EXIT_FAILURE;
                }

                fd = open(udev_device_get_devnode(dev), O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
                if (fd < 0) {
                        log_error("Error, opening device '%s': %m", node);
                        return EXIT_FAILURE;
                }

                /* install list of map codes */
                for (i = 0; i < map_count; i++) {
                        log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
                                  map[i].scan, map[i].scan, map[i].key, map[i].key);
                        if (ioctl(fd, EVIOCSKEYCODE, &map[i]) < 0)
                                log_error("Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", node, map[i].scan, map[i].key);
                }

                /* install list of force-release codes */
                if (release_count > 0)
                        install_force_release(dev, release, release_count);

                close(fd);
        }

        return EXIT_SUCCESS;
}

const struct udev_builtin udev_builtin_keyboard = {
        .name = "keyboard",
        .cmd = builtin_keyboard,
        .help = "keyboard scan code to key mapping",
};