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 <string.h>
  22 #include <stdlib.h>
  23 #include <sys/ioctl.h>
  24 #include <linux/input.h>
  25
  26 #include "udev.h"
  27
  28 static const struct key *keyboard_lookup_key(const char *str, unsigned len);
  29 #include "keyboard-keys-from-name.h"
  30
  31 static int install_force_release(struct udev_device *dev, const unsigned *release, unsigned release_count) {
  32         struct udev_device *atkbd;
  33         const char *cur;
  34         char codes[4096];
  35         char *s;
  36         size_t l;
  37         unsigned i;
  38         int ret;
  39
  40         atkbd = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
  41         if (!atkbd)
  42                 return -ENODEV;
  43
  44         cur = udev_device_get_sysattr_value(atkbd, "force_release");
  45         if (!cur)
  46                 return -ENODEV;
  47
  48         s = codes;
  49         l = sizeof(codes);
  50
  51         /* copy current content */
  52         l = strpcpy(&s, l, cur);
  53
  54         /* append new codes */
  55         for (i = 0; i < release_count; i++)
  56                 l = strpcpyf(&s, l, ",%u", release[i]);
  57
  58         log_debug("keyboard: updating force-release list with '%s'", codes);
  59         ret = udev_device_set_sysattr_value(atkbd, "force_release", codes);
  60         if (ret < 0)
  61                 log_error_errno(ret, "Error writing force-release attribute: %m");
  62         return ret;
  63 }
  64
  65 static void map_keycode(int fd, const char *devnode, int scancode, const char *keycode)
  66 {
  67         struct {
  68                 unsigned scan;
  69                 unsigned key;
  70         } map;
  71         char *endptr;
  72         const struct key *k;
  73         unsigned keycode_num;
  74
  75         /* translate identifier to key code */
  76         k = keyboard_lookup_key(keycode, strlen(keycode));
  77         if (k) {
  78                 keycode_num = k->id;
  79         } else {
  80                 /* check if it's a numeric code already */
  81                 keycode_num = strtoul(keycode, &endptr, 0);
  82                 if (endptr[0] !='\0') {
  83                         log_error("Unknown key identifier '%s'", keycode);
  84                         return;
  85                 }
  86         }
  87
  88         map.scan = scancode;
  89         map.key = keycode_num;
  90
  91         log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
  92                   map.scan, map.scan, map.key, map.key);
  93
  94         if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
  95                 log_error_errno(errno, "Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", devnode, map.scan, map.key);
  96 }
  97
  98 static inline char* parse_token(const char *current, int32_t *val_out) {
  99         char *next;
 100         int32_t val;
 101
 102         if (!current)
 103                 return NULL;
 104
 105         val = strtol(current, &next, 0);
 106         if (*next && *next != ':')
 107                 return NULL;
 108
 109         if (next != current)
 110                 *val_out = val;
 111
 112         if (*next)
 113                 next++;
 114
 115         return next;
 116 }
 117
 118 static void override_abs(int fd, const char *devnode,
 119                          unsigned evcode, const char *value) {
 120         struct input_absinfo absinfo;
 121         int rc;
 122         char *next;
 123
 124         rc = ioctl(fd, EVIOCGABS(evcode), &absinfo);
 125         if (rc < 0) {
 126                 log_error_errno(errno, "Unable to EVIOCGABS device \"%s\"", devnode);
 127                 return;
 128         }
 129
 130         next = parse_token(value, &absinfo.minimum);
 131         next = parse_token(next, &absinfo.maximum);
 132         next = parse_token(next, &absinfo.resolution);
 133         next = parse_token(next, &absinfo.fuzz);
 134         next = parse_token(next, &absinfo.flat);
 135         if (!next) {
 136                 log_error("Unable to parse EV_ABS override '%s' for '%s'", value, devnode);
 137                 return;
 138         }
 139
 140         log_debug("keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32" for \"%s\"",
 141                   evcode,
 142                   absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat,
 143                   devnode);
 144         rc = ioctl(fd, EVIOCSABS(evcode), &absinfo);
 145         if (rc < 0)
 146                 log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
 147 }
 148
 149 static void set_trackpoint_sensitivity(struct udev_device *dev, const char *value)
 150 {
 151         struct udev_device *pdev;
 152         char val_s[DECIMAL_STR_MAX(int)];
 153         int r, val_i;
 154
 155         /* The sensitivity sysfs attr belongs to the serio parent device */
 156         pdev = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
 157         if (!pdev) {
 158                 log_warning("Failed to get serio parent for '%s'", udev_device_get_devnode(dev));
 159                 return;
 160         }
 161
 162         r = safe_atoi(value, &val_i);
 163         if (r < 0) {
 164                 log_error("Unable to parse POINTINGSTICK_SENSITIVITY '%s' for '%s'", value, udev_device_get_devnode(dev));
 165                 return;
 166         }
 167
 168         xsprintf(val_s, "%d", val_i);
 169
 170         r = udev_device_set_sysattr_value(pdev, "sensitivity", val_s);
 171         if (r < 0)
 172                 log_error_errno(r, "Failed to write 'sensitivity' attribute for '%s': %m", udev_device_get_devnode(pdev));
 173 }
 174
 175 static int open_device(const char *devnode) {
 176         int fd;
 177
 178         fd = open(devnode, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
 179         if (fd < 0)
 180                 return log_error_errno(errno, "Error opening device \"%s\": %m", devnode);
 181
 182         return fd;
 183 }
 184
 185 static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], bool test) {
 186         struct udev_list_entry *entry;
 187         unsigned release[1024];
 188         unsigned release_count = 0;
 189         _cleanup_close_ int fd = -1;
 190         const char *node;
 191
 192         node = udev_device_get_devnode(dev);
 193         if (!node) {
 194                 log_error("No device node for \"%s\"", udev_device_get_syspath(dev));
 195                 return EXIT_FAILURE;
 196         }
 197
 198         udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
 199                 const char *key;
 200                 char *endptr;
 201
 202                 key = udev_list_entry_get_name(entry);
 203                 if (startswith(key, "KEYBOARD_KEY_")) {
 204                         const char *keycode;
 205                         unsigned scancode;
 206
 207                         /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
 208                         scancode = strtoul(key + 13, &endptr, 16);
 209                         if (endptr[0] != '\0') {
 210                                 log_warning("Unable to parse scan code from \"%s\"", key);
 211                                 continue;
 212                         }
 213
 214                         keycode = udev_list_entry_get_value(entry);
 215
 216                         /* a leading '!' needs a force-release entry */
 217                         if (keycode[0] == '!') {
 218                                 keycode++;
 219
 220                                 release[release_count] = scancode;
 221                                 if (release_count <  ELEMENTSOF(release)-1)
 222                                         release_count++;
 223
 224                                 if (keycode[0] == '\0')
 225                                         continue;
 226                         }
 227
 228                         if (fd == -1) {
 229                                 fd = open_device(node);
 230                                 if (fd < 0)
 231                                         return EXIT_FAILURE;
 232                         }
 233
 234                         map_keycode(fd, node, scancode, keycode);
 235                 } else if (startswith(key, "EVDEV_ABS_")) {
 236                         unsigned evcode;
 237
 238                         /* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
 239                         evcode = strtoul(key + 10, &endptr, 16);
 240                         if (endptr[0] != '\0') {
 241                                 log_warning("Unable to parse EV_ABS code from \"%s\"", key);
 242                                 continue;
 243                         }
 244
 245                         if (fd == -1) {
 246                                 fd = open_device(node);
 247                                 if (fd < 0)
 248                                         return EXIT_FAILURE;
 249                         }
 250
 251                         override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
 252                 } else if (streq(key, "POINTINGSTICK_SENSITIVITY")) {
 253                         set_trackpoint_sensitivity(dev, udev_list_entry_get_value(entry));
 254                 }
 255         }
 256
 257         /* install list of force-release codes */
 258         if (release_count > 0)
 259                 install_force_release(dev, release, release_count);
 260
 261         return EXIT_SUCCESS;
 262 }
 263
 264 const struct udev_builtin udev_builtin_keyboard = {
 265         .name = "keyboard",
 266         .cmd = builtin_keyboard,
 267         .help = "Keyboard scan code to key mapping",
 268 };