src/udev/udev-builtin-keyboard.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Kay Sievers <kay@vrfy.org>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/ioctl.h>
  24 #include <linux/input.h>
  25
  26 #include "string-util.h"
  27 #include "udev.h"
  28
  29 static const struct key *keyboard_lookup_key(const char *str, unsigned len);
  30 #include "keyboard-keys-from-name.h"
  31
  32 static int install_force_release(struct udev_device *dev, const unsigned *release, unsigned release_count) {
  33         struct udev_device *atkbd;
  34         const char *cur;
  35         char codes[4096];
  36         char *s;
  37         size_t l;
  38         unsigned i;
  39         int ret;
  40
  41         assert(dev);
  42         assert(release);
  43
  44         atkbd = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
  45         if (!atkbd)
  46                 return -ENODEV;
  47
  48         cur = udev_device_get_sysattr_value(atkbd, "force_release");
  49         if (!cur)
  50                 return -ENODEV;
  51
  52         s = codes;
  53         l = sizeof(codes);
  54
  55         /* copy current content */
  56         l = strpcpy(&s, l, cur);
  57
  58         /* append new codes */
  59         for (i = 0; i < release_count; i++)
  60                 l = strpcpyf(&s, l, ",%u", release[i]);
  61
  62         log_debug("keyboard: updating force-release list with '%s'", codes);
  63         ret = udev_device_set_sysattr_value(atkbd, "force_release", codes);
  64         if (ret < 0)
  65                 log_error_errno(ret, "Error writing force-release attribute: %m");
  66         return ret;
  67 }
  68
  69 static void map_keycode(int fd, const char *devnode, int scancode, const char *keycode)
  70 {
  71         struct {
  72                 unsigned scan;
  73                 unsigned key;
  74         } map;
  75         char *endptr;
  76         const struct key *k;
  77         unsigned keycode_num;
  78
  79         /* translate identifier to key code */
  80         k = keyboard_lookup_key(keycode, strlen(keycode));
  81         if (k) {
  82                 keycode_num = k->id;
  83         } else {
  84                 /* check if it's a numeric code already */
  85                 keycode_num = strtoul(keycode, &endptr, 0);
  86                 if (endptr[0] !='\0') {
  87                         log_error("Unknown key identifier '%s'", keycode);
  88                         return;
  89                 }
  90         }
  91
  92         map.scan = scancode;
  93         map.key = keycode_num;
  94
  95         log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
  96                   map.scan, map.scan, map.key, map.key);
  97
  98         if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
  99                 log_error_errno(errno, "Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", devnode, map.scan, map.key);
 100 }
 101
 102 static inline char* parse_token(const char *current, int32_t *val_out) {
 103         char *next;
 104         int32_t val;
 105
 106         if (!current)
 107                 return NULL;
 108
 109         val = strtol(current, &next, 0);
 110         if (*next && *next != ':')
 111                 return NULL;
 112
 113         if (next != current)
 114                 *val_out = val;
 115
 116         if (*next)
 117                 next++;
 118
 119         return next;
 120 }
 121
 122 static void override_abs(int fd, const char *devnode,
 123                          unsigned evcode, const char *value) {
 124         struct input_absinfo absinfo;
 125         int rc;
 126         char *next;
 127
 128         rc = ioctl(fd, EVIOCGABS(evcode), &absinfo);
 129         if (rc < 0) {
 130                 log_error_errno(errno, "Unable to EVIOCGABS device \"%s\"", devnode);
 131                 return;
 132         }
 133
 134         next = parse_token(value, &absinfo.minimum);
 135         next = parse_token(next, &absinfo.maximum);
 136         next = parse_token(next, &absinfo.resolution);
 137         next = parse_token(next, &absinfo.fuzz);
 138         next = parse_token(next, &absinfo.flat);
 139         if (!next) {
 140                 log_error("Unable to parse EV_ABS override '%s' for '%s'", value, devnode);
 141                 return;
 142         }
 143
 144         log_debug("keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32" for \"%s\"",
 145                   evcode,
 146                   absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat,
 147                   devnode);
 148         rc = ioctl(fd, EVIOCSABS(evcode), &absinfo);
 149         if (rc < 0)
 150                 log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
 151 }
 152
 153 static void set_trackpoint_sensitivity(struct udev_device *dev, const char *value)
 154 {
 155         struct udev_device *pdev;
 156         char val_s[DECIMAL_STR_MAX(int)];
 157         int r, val_i;
 158
 159         assert(dev);
 160         assert(value);
 161
 162         /* The sensitivity sysfs attr belongs to the serio parent device */
 163         pdev = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
 164         if (!pdev) {
 165                 log_warning("Failed to get serio parent for '%s'", udev_device_get_devnode(dev));
 166                 return;
 167         }
 168
 169         r = safe_atoi(value, &val_i);
 170         if (r < 0) {
 171                 log_error("Unable to parse POINTINGSTICK_SENSITIVITY '%s' for '%s'", value, udev_device_get_devnode(dev));
 172                 return;
 173         }
 174
 175         xsprintf(val_s, "%d", val_i);
 176
 177         r = udev_device_set_sysattr_value(pdev, "sensitivity", val_s);
 178         if (r < 0)
 179                 log_error_errno(r, "Failed to write 'sensitivity' attribute for '%s': %m", udev_device_get_devnode(pdev));
 180 }
 181
 182 static int open_device(const char *devnode) {
 183         int fd;
 184
 185         fd = open(devnode, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 186         if (fd < 0)
 187                 return log_error_errno(errno, "Error opening device \"%s\": %m", devnode);
 188
 189         return fd;
 190 }
 191
 192 static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], bool test) {
 193         struct udev_list_entry *entry;
 194         unsigned release[1024];
 195         unsigned release_count = 0;
 196         _cleanup_close_ int fd = -1;
 197         const char *node;
 198
 199         node = udev_device_get_devnode(dev);
 200         if (!node) {
 201                 log_error("No device node for \"%s\"", udev_device_get_syspath(dev));
 202                 return EXIT_FAILURE;
 203         }
 204
 205         udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
 206                 const char *key;
 207                 char *endptr;
 208
 209                 key = udev_list_entry_get_name(entry);
 210                 if (startswith(key, "KEYBOARD_KEY_")) {
 211                         const char *keycode;
 212                         unsigned scancode;
 213
 214                         /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
 215                         scancode = strtoul(key + 13, &endptr, 16);
 216                         if (endptr[0] != '\0') {
 217                                 log_warning("Unable to parse scan code from \"%s\"", key);
 218                                 continue;
 219                         }
 220
 221                         keycode = udev_list_entry_get_value(entry);
 222
 223                         /* a leading '!' needs a force-release entry */
 224                         if (keycode[0] == '!') {
 225                                 keycode++;
 226
 227                                 release[release_count] = scancode;
 228                                 if (release_count <  ELEMENTSOF(release)-1)
 229                                         release_count++;
 230
 231                                 if (keycode[0] == '\0')
 232                                         continue;
 233                         }
 234
 235                         if (fd == -1) {
 236                                 fd = open_device(node);
 237                                 if (fd < 0)
 238                                         return EXIT_FAILURE;
 239                         }
 240
 241                         map_keycode(fd, node, scancode, keycode);
 242                 } else if (startswith(key, "EVDEV_ABS_")) {
 243                         unsigned evcode;
 244
 245                         /* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
 246                         evcode = strtoul(key + 10, &endptr, 16);
 247                         if (endptr[0] != '\0') {
 248                                 log_warning("Unable to parse EV_ABS code from \"%s\"", key);
 249                                 continue;
 250                         }
 251
 252                         if (fd == -1) {
 253                                 fd = open_device(node);
 254                                 if (fd < 0)
 255                                         return EXIT_FAILURE;
 256                         }
 257
 258                         override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
 259                 } else if (streq(key, "POINTINGSTICK_SENSITIVITY"))
 260                         set_trackpoint_sensitivity(dev, udev_list_entry_get_value(entry));
 261         }
 262
 263         /* install list of force-release codes */
 264         if (release_count > 0)
 265                 install_force_release(dev, release, release_count);
 266
 267         return EXIT_SUCCESS;
 268 }
 269
 270 const struct udev_builtin udev_builtin_keyboard = {
 271         .name = "keyboard",
 272         .cmd = builtin_keyboard,
 273         .help = "Keyboard scan code to key mapping",
 274 };