summaryrefslogtreecommitdiffstats
path: root/src/udev/udev-builtin-keyboard.c
blob: 6dd9eebd9323fcc4d9e610d642fc2121ed0067c1 (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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/* SPDX-License-Identifier: LGPL-2.1-or-later */

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

#include "device-util.h"
#include "fd-util.h"
#include "parse-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strxcpyx.h"
#include "udev-builtin.h"

static const struct key_name *keyboard_lookup_key(const char *str, GPERF_LEN_TYPE len);
#include "keyboard-keys-from-name.h"

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

        assert(dev);
        assert(release);

        r = sd_device_get_parent_with_subsystem_devtype(dev, "serio", NULL, &atkbd);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to get serio parent: %m");

        r = sd_device_get_sysattr_value(atkbd, "force_release", &cur);
        if (r < 0)
                return log_device_error_errno(atkbd, r, "Failed to get force-release attribute: %m");

        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, ",%u", release[i]);

        log_device_debug(atkbd, "keyboard: updating force-release list with '%s'", codes);
        r = sd_device_set_sysattr_value(atkbd, "force_release", codes);
        if (r < 0)
                return log_device_error_errno(atkbd, r, "Failed to set force-release attribute: %m");

        return 0;
}

static int map_keycode(sd_device *dev, int fd, int scancode, const char *keycode) {
        struct {
                unsigned scan;
                unsigned key;
        } map;
        const struct key_name *k;
        unsigned keycode_num;
        int r;

        /* 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 */
                r = safe_atou(keycode, &keycode_num);
                if (r < 0)
                        return log_device_error_errno(dev, r, "Failed to parse key identifier '%s': %m", keycode);
        }

        map.scan = scancode;
        map.key = keycode_num;

        log_device_debug(dev, "keyboard: mapping scan code %u (0x%x) to key code %u (0x%x)",
                         map.scan, map.scan, map.key, map.key);

        if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
                return log_device_error_errno(dev, errno, "Failed to call EVIOCSKEYCODE with scan code 0x%x, and key code %u: %m", map.scan, map.key);

        return 0;
}

static const char* parse_token(const char *current, int32_t *val_out) {
        char *next;
        int32_t val;

        if (!current)
                return NULL;

        val = strtol(current, &next, 0);
        if (*next && *next != ':')
                return NULL;

        if (next != current)
                *val_out = val;

        if (*next)
                next++;

        return next;
}

static int override_abs(sd_device *dev, int fd, unsigned evcode, const char *value) {
        struct input_absinfo absinfo;
        const char *next;

        if (ioctl(fd, EVIOCGABS(evcode), &absinfo) < 0)
                return log_device_error_errno(dev, errno, "Failed to call EVIOCGABS");

        next = parse_token(value, &absinfo.minimum);
        next = parse_token(next, &absinfo.maximum);
        next = parse_token(next, &absinfo.resolution);
        next = parse_token(next, &absinfo.fuzz);
        next = parse_token(next, &absinfo.flat);
        if (!next)
                return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL),
                                              "Failed to parse EV_ABS override '%s'", value);

        log_device_debug(dev, "keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32,
                         evcode, absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat);
        if (ioctl(fd, EVIOCSABS(evcode), &absinfo) < 0)
                return log_device_error_errno(dev, errno, "Failed to call EVIOCSABS");

        return 0;
}

static int set_trackpoint_sensitivity(sd_device *dev, const char *value) {
        sd_device *pdev;
        char val_s[DECIMAL_STR_MAX(int)];
        int r, val_i;

        assert(dev);
        assert(value);

        /* The sensitivity sysfs attr belongs to the serio parent device */
        r = sd_device_get_parent_with_subsystem_devtype(dev, "serio", NULL, &pdev);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to get serio parent: %m");

        r = safe_atoi(value, &val_i);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to parse POINTINGSTICK_SENSITIVITY '%s': %m", value);
        else if (val_i < 0 || val_i > 255)
                return log_device_error_errno(dev, SYNTHETIC_ERRNO(ERANGE), "POINTINGSTICK_SENSITIVITY %d outside range [0..255]", val_i);

        xsprintf(val_s, "%d", val_i);

        r = sd_device_set_sysattr_value(pdev, "sensitivity", val_s);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to write 'sensitivity' attribute: %m");

        return 0;
}

static int builtin_keyboard(sd_device *dev, sd_netlink **rtnl, int argc, char *argv[], bool test) {
        unsigned release[1024];
        unsigned release_count = 0;
        _cleanup_close_ int fd = -1;
        const char *node, *key, *value;
        int has_abs = -1, r;

        r = sd_device_get_devname(dev, &node);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to get device name: %m");

        FOREACH_DEVICE_PROPERTY(dev, key, value)
                if (startswith(key, "KEYBOARD_KEY_")) {
                        const char *keycode = value;
                        unsigned scancode;

                        /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
                        r = safe_atou_full(key + 13, 16, &scancode);
                        if (r < 0) {
                                log_device_warning_errno(dev, r, "Failed to parse scan code from \"%s\", ignoring: %m", key);
                                continue;
                        }

                        /* 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;
                        }

                        if (fd < 0) {
                                fd = sd_device_open(dev, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
                                if (fd < 0)
                                        return log_device_error_errno(dev, fd, "Failed to open device '%s': %m", node);
                        }

                        (void) map_keycode(dev, fd, scancode, keycode);
                } else if (startswith(key, "EVDEV_ABS_")) {
                        unsigned evcode;

                        /* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
                        r = safe_atou_full(key + 10, 16, &evcode);
                        if (r < 0) {
                                log_device_warning_errno(dev, r, "Failed to parse EV_ABS code from \"%s\", ignoring: %m", key);
                                continue;
                        }

                        if (fd < 0) {
                                fd = sd_device_open(dev, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
                                if (fd < 0)
                                        return log_device_error_errno(dev, fd, "Failed to open device '%s': %m", node);
                        }

                        if (has_abs == -1) {
                                unsigned long bits;
                                int rc;

                                rc = ioctl(fd, EVIOCGBIT(0, sizeof(bits)), &bits);
                                if (rc < 0)
                                        return log_device_error_errno(dev, errno, "Failed to set EVIOCGBIT");

                                has_abs = !!(bits & (1 << EV_ABS));
                                if (!has_abs)
                                        log_device_warning(dev, "EVDEV_ABS override set but no EV_ABS present on device");
                        }

                        if (!has_abs)
                                continue;

                        (void) override_abs(dev, fd, evcode, value);
                } else if (streq(key, "POINTINGSTICK_SENSITIVITY"))
                        (void) set_trackpoint_sensitivity(dev, value);

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

        return 0;
}

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