keymap.c revision 2417dc20f5147556d0ed4f95a37b1547fb4b0f2b
/*
* 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.
*
* keymap 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.
*
* keymap 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 keymap; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.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/input.h>
const struct key* lookup_key (const char *str, unsigned int len);
#include "keys-from-name.h"
#include "keys-to-name.h"
#define MAX_SCANCODES 1024
/* If keymap file is given without a path, assume this one; must end with '/' * */
#define DEFAULT_PATH "/lib/udev/keymaps/"
static int evdev_open(const char *dev)
{
int fd;
char fn[PATH_MAX];
if (strncmp(dev, "/dev", 4) != 0) {
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, int scancode, int e)
{
int codes[2];
codes[0] = scancode;
if (ioctl(fd, EVIOCGKEYCODE, codes) < 0) {
if (e && errno == EINVAL) {
return -2;
} else {
fprintf(stderr, "EVIOCGKEYCODE: %m\n");
return -1;
}
}
return codes[1];
}
static int evdev_set_keycode(int fd, int scancode, int keycode)
{
int codes[2];
codes[0] = scancode;
codes[1] = 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];
int scancode, 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)
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 int merge_table(int fd, const char *filename) {
int r = 0;
int line = 0;
FILE* f;
f = fopen(filename, "r");
if (!f) {
perror(filename);
r = -1;
goto fail;
}
while (!feof(f)) {
char s[256], *p;
int scancode, 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;
goto fail;
}
if (evdev_set_keycode(fd, scancode, new_keycode) < 0) {
r = -1;
goto fail;
}
if (new_keycode != old_keycode)
fprintf(stderr, "Remapped scancode 0x%02x to 0x%02x (prior: 0x%02x)\n",
scancode, new_keycode, old_keycode);
}
fail:
return r;
}
static const char* default_keymap_path(const char* path)
{
static char result[PATH_MAX];
if (!strchr(path, '/')) {
snprintf(result, sizeof(result), "%s%s", DEFAULT_PATH, path);
return result;
}
return path;
}
static void print_key(struct input_event *event)
{
static int cur_scancode = 0;
/* save scan code for next EV_KEY event */
if (event->type == EV_MSC && event->code == MSC_SCAN)
cur_scancode = event->value;
/* key press */
if (event->type == EV_KEY && event->value)
printf("scan code: 0x%02X key code: %s\n", cur_scancode,
format_keyname(key_names[event->code]));
}
static void interactive(int fd)
{
struct input_event ev;
int run = 1;
/* grab input device */
ioctl(fd, EVIOCGRAB, 1);
puts("Press ESC to finish");
while (run) {
switch (read(fd, &ev, sizeof(ev))) {
case -1:
perror("read");
run = 0;
break;
case 0:
run = 0;
break;
default:
print_key(&ev);
/* stop on Escape key release */
if (ev.type == EV_KEY && ev.code == KEY_ESC && ev.value == 0)
run = 0;
break;
}
}
/* release input device */
ioctl(fd, EVIOCGRAB, 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;
while (1) {
int option;
option = getopt_long(argc, argv, "hi", options, NULL);
if (option == -1)
break;
switch (option) {
case 'h':
printf("Usage: keymap <event device> [<map file>]\n\n");
return 0;
case 'i':
opt_interactive = 1;
break;
default:
return 1;
}
}
if (argc < optind+1 || argc > optind+2) {
fprintf(stderr, "Usage: keymap <event device> [<map file>]\n\n");
return 2;
}
if ((fd = evdev_open(argv[optind])) < 0)
return 3;
if (argc == optind+2)
merge_table(fd, default_keymap_path(argv[optind+1]));
else {
if (opt_interactive)
interactive(fd);
else
dump_table(fd);
}
return 0;
}