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/***
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 <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <linux/input.h>
#include "udev.h"
static const struct key *keyboard_lookup_key(const char *str, unsigned len);
#include "keyboard-keys-from-name.h"
static int install_force_release(struct udev_device *dev, const unsigned *release, unsigned release_count) {
struct udev_device *atkbd;
const char *cur;
char codes[4096];
char *s;
size_t l;
unsigned 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, ",%u", 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 void map_keycode(int fd, const char *devnode, int scancode, const char *keycode)
{
struct {
unsigned scan;
unsigned key;
} map;
char *endptr;
const struct key *k;
unsigned keycode_num;
/* 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("Unknown key identifier '%s'", keycode);
return;
}
}
map.scan = scancode;
map.key = keycode_num;
log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
map.scan, map.scan, map.key, map.key);
if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
log_error_errno(errno, "Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", devnode, map.scan, map.key);
}
static inline 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 void override_abs(int fd, const char *devnode,
unsigned evcode, const char *value) {
struct input_absinfo absinfo;
int rc;
char *next;
rc = ioctl(fd, EVIOCGABS(evcode), &absinfo);
if (rc < 0) {
log_error_errno(errno, "Unable to EVIOCGABS device \"%s\"", devnode);
return;
}
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) {
log_error("Unable to parse EV_ABS override '%s' for '%s'", value, devnode);
return;
}
log_debug("keyboard: %x overriden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32" for \"%s\"",
evcode,
absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat,
devnode);
rc = ioctl(fd, EVIOCSABS(evcode), &absinfo);
if (rc < 0)
log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
}
static int open_device(const char *devnode) {
int fd;
fd = open(devnode, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
if (fd < 0)
return log_error_errno(errno, "Error opening device \"%s\": %m", devnode);
return fd;
}
static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], bool test) {
struct udev_list_entry *entry;
unsigned release[1024];
unsigned release_count = 0;
_cleanup_close_ int fd = -1;
const char *node;
node = udev_device_get_devnode(dev);
if (!node) {
log_error("No device node for \"%s\"", udev_device_get_syspath(dev));
return EXIT_FAILURE;
}
udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
const char *key;
char *endptr;
key = udev_list_entry_get_name(entry);
if (startswith(key, "KEYBOARD_KEY_")) {
const char *keycode;
unsigned scancode;
/* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
scancode = strtoul(key + 13, &endptr, 16);
if (endptr[0] != '\0') {
log_warning("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;
}
if (fd == -1) {
fd = open_device(node);
if (fd < 0)
return EXIT_FAILURE;
}
map_keycode(fd, node, scancode, keycode);
} else if (startswith(key, "EVDEV_ABS_")) {
unsigned evcode;
/* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
evcode = strtoul(key + 10, &endptr, 16);
if (endptr[0] != '\0') {
log_warning("Unable to parse EV_ABS code from \"%s\"", key);
continue;
}
if (fd == -1) {
fd = open_device(node);
if (fd < 0)
return EXIT_FAILURE;
}
override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
}
}
/* install list of force-release codes */
if (release_count > 0)
install_force_release(dev, release, release_count);
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_keyboard = {
.name = "keyboard",
.cmd = builtin_keyboard,
.help = "Keyboard scan code to key mapping",
};
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