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/*
* keymap - dump keymap of an evdev device or set a new keymap from a file
*
* Based on keyfuzz by Lennart Poettering <mzqrovna@0pointer.net>
* Adapted for udev-extras by Martin Pitt <martin.pitt@ubuntu.com>
*
* Copyright (C) 2006, Lennart Poettering
* Copyright (C) 2009, Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <linux/limits.h>
#include <linux/input.h>
const struct key* lookup_key (const char *str, unsigned int len);
#include "keys-from-name.h"
#include "keys-to-name.h"
#include "macro.h"
#include "util.h"
#define MAX_SCANCODES 1024
static int evdev_open(const char *dev)
{
int fd;
char fn[PATH_MAX];
if (!startswith(dev, "/dev")) {
snprintf(fn, sizeof(fn), "/dev/%s", dev);
dev = fn;
}
if ((fd = open(dev, O_RDWR)) < 0) {
fprintf(stderr, "error open('%s'): %m\n", dev);
return -1;
}
return fd;
}
static int evdev_get_keycode(int fd, unsigned scancode, int e)
{
unsigned codes[2];
codes[0] = scancode;
if (ioctl(fd, EVIOCGKEYCODE, codes) < 0) {
if (e && errno == EINVAL) {
return -2;
} else {
fprintf(stderr, "EVIOCGKEYCODE for scan code 0x%x: %m\n", scancode);
return -1;
}
}
return codes[1];
}
static int evdev_set_keycode(int fd, unsigned scancode, int keycode)
{
unsigned codes[2];
codes[0] = scancode;
codes[1] = (unsigned) keycode;
if (ioctl(fd, EVIOCSKEYCODE, codes) < 0) {
fprintf(stderr, "EVIOCSKEYCODE: %m\n");
return -1;
}
return 0;
}
static int evdev_driver_version(int fd, char *v, size_t l)
{
int version;
if (ioctl(fd, EVIOCGVERSION, &version)) {
fprintf(stderr, "EVIOCGVERSION: %m\n");
return -1;
}
snprintf(v, l, "%i.%i.%i.", version >> 16, (version >> 8) & 0xff, version & 0xff);
return 0;
}
static int evdev_device_name(int fd, char *n, size_t l)
{
if (ioctl(fd, EVIOCGNAME(l), n) < 0) {
fprintf(stderr, "EVIOCGNAME: %m\n");
return -1;
}
return 0;
}
/* Return a lower-case string with KEY_ prefix removed */
static const char* format_keyname(const char* key) {
static char result[101];
const char* s;
int len;
for (s = key+4, len = 0; *s && len < 100; ++len, ++s)
result[len] = tolower(*s);
result[len] = '\0';
return result;
}
static int dump_table(int fd) {
char version[256], name[256];
unsigned scancode;
int r = -1;
if (evdev_driver_version(fd, version, sizeof(version)) < 0)
goto fail;
if (evdev_device_name(fd, name, sizeof(name)) < 0)
goto fail;
printf("### evdev %s, driver '%s'\n", version, name);
r = 0;
for (scancode = 0; scancode < MAX_SCANCODES; scancode++) {
int keycode;
if ((keycode = evdev_get_keycode(fd, scancode, 1)) < 0) {
if (keycode == -2)
continue;
r = -1;
break;
}
if (keycode < KEY_MAX && key_names[keycode])
printf("0x%03x %s\n", scancode, format_keyname(key_names[keycode]));
else
printf("0x%03x 0x%03x\n", scancode, keycode);
}
fail:
return r;
}
static void set_key(int fd, const char* scancode_str, const char* keyname)
{
unsigned scancode;
char *endptr;
char t[105] = "KEY_UNKNOWN";
const struct key *k;
scancode = (unsigned) strtol(scancode_str, &endptr, 0);
if (*endptr != '\0') {
fprintf(stderr, "ERROR: Invalid scancode\n");
exit(1);
}
snprintf(t, sizeof(t), "KEY_%s", keyname);
if (!(k = lookup_key(t, strlen(t)))) {
fprintf(stderr, "ERROR: Unknown key name '%s'\n", keyname);
exit(1);
}
if (evdev_set_keycode(fd, scancode, k->id) < 0)
fprintf(stderr, "setting scancode 0x%2X to key code %i failed\n",
scancode, k->id);
else
printf("setting scancode 0x%2X to key code %i\n",
scancode, k->id);
}
static int merge_table(int fd, FILE *f) {
int r = 0;
int line = 0;
while (!feof(f)) {
char s[256], *p;
unsigned scancode;
int new_keycode, old_keycode;
if (!fgets(s, sizeof(s), f))
break;
line++;
p = s+strspn(s, "\t ");
if (*p == '#' || *p == '\n')
continue;
if (sscanf(p, "%i %i", &scancode, &new_keycode) != 2) {
char t[105] = "KEY_UNKNOWN";
const struct key *k;
if (sscanf(p, "%i %100s", &scancode, t+4) != 2) {
fprintf(stderr, "WARNING: Parse failure at line %i, ignoring.\n", line);
r = -1;
continue;
}
if (!(k = lookup_key(t, strlen(t)))) {
fprintf(stderr, "WARNING: Unknown key '%s' at line %i, ignoring.\n", t, line);
r = -1;
continue;
}
new_keycode = k->id;
}
if ((old_keycode = evdev_get_keycode(fd, scancode, 0)) < 0) {
r = -1;
continue;
}
if (evdev_set_keycode(fd, scancode, new_keycode) < 0) {
r = -1;
continue;
}
if (new_keycode != old_keycode)
fprintf(stderr, "Remapped scancode 0x%02x to 0x%02x (prior: 0x%02x)\n",
scancode, new_keycode, old_keycode);
}
fclose(f);
return r;
}
/* read one event; return 1 if valid */
static int read_event(int fd, struct input_event* ev)
{
int ret;
ret = read(fd, ev, sizeof(struct input_event));
if (ret < 0) {
perror("read");
return 0;
}
if (ret != sizeof(struct input_event)) {
fprintf(stderr, "did not get enough data for event struct, aborting\n");
return 0;
}
return 1;
}
static void print_key(unsigned scancode, uint16_t keycode, int has_scan, int has_key)
{
const char *keyname;
/* ignore key release events */
if (has_key == 1)
return;
if (has_key == 0 && has_scan != 0) {
fprintf(stderr, "got scan code event 0x%02X without a key code event\n",
scancode);
return;
}
if (has_scan != 0)
printf("scan code: 0x%02X ", scancode);
else
printf("(no scan code received) ");
keyname = key_names[keycode];
if (keyname != NULL)
printf("key code: %s\n", format_keyname(keyname));
else
printf("key code: %03X\n", keycode);
}
static void interactive(int fd)
{
struct input_event ev;
unsigned last_scan = 0;
uint16_t last_key = 0;
int has_scan; /* boolean */
int has_key; /* 0: none, 1: release, 2: press */
/* grab input device */
ioctl(fd, EVIOCGRAB, 1);
puts("Press ESC to finish, or Control-C if this device is not your primary keyboard");
has_scan = has_key = 0;
while (read_event(fd, &ev)) {
/* Drivers usually send the scan code first, then the key code,
* then a SYN. Some drivers (like thinkpad_acpi) send the key
* code first, and some drivers might not send SYN events, so
* keep a robust state machine which can deal with any of those
*/
if (ev.type == EV_MSC && ev.code == MSC_SCAN) {
if (has_scan) {
fputs("driver did not send SYN event in between key events; previous event:\n",
stderr);
print_key(last_scan, last_key, has_scan, has_key);
has_key = 0;
}
last_scan = ev.value;
has_scan = 1;
/*printf("--- got scan %u; has scan %i key %i\n", last_scan, has_scan, has_key); */
}
else if (ev.type == EV_KEY) {
if (has_key) {
fputs("driver did not send SYN event in between key events; previous event:\n",
stderr);
print_key(last_scan, last_key, has_scan, has_key);
has_scan = 0;
}
last_key = ev.code;
has_key = 1 + ev.value;
/*printf("--- got key %hu; has scan %i key %i\n", last_key, has_scan, has_key);*/
/* Stop on ESC */
if (ev.code == KEY_ESC && ev.value == 0)
break;
}
else if (ev.type == EV_SYN) {
/*printf("--- got SYN; has scan %i key %i\n", has_scan, has_key);*/
print_key(last_scan, last_key, has_scan, has_key);
has_scan = has_key = 0;
}
}
/* release input device */
ioctl(fd, EVIOCGRAB, 0);
}
_noreturn_ static void help(int error)
{
const char* h = "Usage: keymap <event device> [<map file>]\n"
" keymap <event device> scancode keyname [...]\n"
" keymap -i <event device>\n";
if (error) {
fputs(h, stderr);
exit(2);
} else {
fputs(h, stdout);
exit(0);
}
}
int main(int argc, char **argv)
{
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "interactive", no_argument, NULL, 'i' },
{}
};
int fd = -1;
int opt_interactive = 0;
int i;
while (1) {
int option;
option = getopt_long(argc, argv, "hi", options, NULL);
if (option == -1)
break;
switch (option) {
case 'h':
help(0);
case 'i':
opt_interactive = 1;
break;
default:
return 1;
}
}
if (argc < optind+1)
help (1);
if ((fd = evdev_open(argv[optind])) < 0)
return 3;
/* one argument (device): dump or interactive */
if (argc == optind+1) {
if (opt_interactive)
interactive(fd);
else
dump_table(fd);
return 0;
}
/* two arguments (device, mapfile): set map file */
if (argc == optind+2) {
const char *filearg = argv[optind+1];
if (strchr(filearg, '/')) {
/* Keymap file argument is a path */
FILE *f = fopen(filearg, "re");
if (f)
merge_table(fd, f);
else
perror(filearg);
} else {
/* Keymap file argument is a filename */
/* Open override file if present, otherwise default file */
char keymap_path[PATH_MAX];
FILE *f;
snprintf(keymap_path, sizeof(keymap_path), "/etc/udev/keymaps/%s", filearg);
f = fopen(keymap_path, "re");
if (f) {
merge_table(fd, f);
} else {
snprintf(keymap_path, sizeof(keymap_path), UDEVLIBEXECDIR "/keymaps/%s", filearg);
f = fopen(keymap_path, "re");
if (f)
merge_table(fd, f);
else
perror(keymap_path);
}
}
return 0;
}
/* more arguments (device, scancode/keyname pairs): set keys directly */
if ((argc - optind - 1) % 2 == 0) {
for (i = optind+1; i < argc; i += 2)
set_key(fd, argv[i], argv[i+1]);
return 0;
}
/* invalid number of arguments */
help(1);
return 1; /* not reached */
}