plugins/udev.c

   1 /*
   2  *
   3  *  oFono - Open Source Telephony
   4  *
   5  *  Copyright (C) 2008-2011  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <errno.h>
  27 #include <ctype.h>
  28 #include <stdlib.h>
  29
  30 #include <libudev.h>
  31
  32 #include <glib.h>
  33 #include <string.h>
  34
  35 #define OFONO_API_SUBJECT_TO_CHANGE
  36 #include <ofono/plugin.h>
  37 #include <ofono/modem.h>
  38 #include <ofono/log.h>
  39
  40 static GSList *modem_list = NULL;
  41 static GHashTable *devpath_list = NULL;
  42
  43 static struct ofono_modem *find_modem(const char *devpath)
  44 {
  45         GSList *list;
  46
  47         for (list = modem_list; list; list = list->next) {
  48                 struct ofono_modem *modem = list->data;
  49                 const char *path = ofono_modem_get_string(modem, "Path");
  50
  51                 if (g_strcmp0(devpath, path) == 0)
  52                         return modem;
  53         }
  54
  55         return NULL;
  56 }
  57
  58 static const char *get_property(struct udev_device *device,
  59                                 char const *property_name)
  60 {
  61         struct udev_list_entry *entry;
  62
  63         entry = udev_device_get_properties_list_entry(device);
  64         while (entry) {
  65                 const char *name = udev_list_entry_get_name(entry);
  66
  67                 if (g_strcmp0(name, property_name) == 0)
  68                         return udev_list_entry_get_value(entry);
  69
  70                 entry = udev_list_entry_get_next(entry);
  71         }
  72
  73         return NULL;
  74 }
  75
  76 static const char *get_driver(struct udev_device *udev_device)
  77 {
  78         return get_property(udev_device, "OFONO_DRIVER");
  79 }
  80
  81 static const char *get_serial(struct udev_device *udev_device)
  82 {
  83         const char *serial;
  84
  85         serial = get_property(udev_device, "ID_SERIAL_SHORT");
  86
  87         if (serial != NULL) {
  88                 unsigned int i, len = strlen(serial);
  89
  90                 for (i = 0; i < len; i++) {
  91                         if (!g_ascii_isalnum(serial[i]))
  92                                 return NULL;
  93                 }
  94         }
  95
  96         return serial;
  97 }
  98
  99 static void add_ifx(struct ofono_modem *modem,
 100                                         struct udev_device *udev_device)
 101 {
 102         struct udev_list_entry *entry;
 103         const char *devnode;
 104
 105         DBG("modem %p", modem);
 106
 107         devnode = udev_device_get_devnode(udev_device);
 108         ofono_modem_set_string(modem, "Device", devnode);
 109
 110         entry = udev_device_get_properties_list_entry(udev_device);
 111         while (entry) {
 112                 const char *name = udev_list_entry_get_name(entry);
 113                 const char *value = udev_list_entry_get_value(entry);
 114
 115                 if (g_str_equal(name, "OFONO_IFX_LDISC") == TRUE)
 116                         ofono_modem_set_string(modem, "LineDiscipline", value);
 117                 else if (g_str_equal(name, "OFONO_IFX_AUDIO") == TRUE)
 118                         ofono_modem_set_string(modem, "AudioSetting", value);
 119                 else if (g_str_equal(name, "OFONO_IFX_LOOPBACK") == TRUE)
 120                         ofono_modem_set_string(modem, "AudioLoopback", value);
 121
 122                 entry = udev_list_entry_get_next(entry);
 123         }
 124
 125         ofono_modem_register(modem);
 126 }
 127
 128 static void add_isi(struct ofono_modem *modem,
 129                                         struct udev_device *udev_device)
 130 {
 131         const char *ifname, *type, *addr;
 132
 133         DBG("modem %p", modem);
 134
 135         if (ofono_modem_get_string(modem, "Interface"))
 136                 return;
 137
 138         addr = get_property(udev_device, "OFONO_ISI_ADDRESS");
 139         if (addr != NULL)
 140                 ofono_modem_set_integer(modem, "Address", atoi(addr));
 141
 142         if (g_strcmp0(udev_device_get_subsystem(udev_device), "net") != 0)
 143                 return;
 144
 145         type = udev_device_get_sysattr_value(udev_device, "type");
 146         if (g_strcmp0(type, "820") != 0)
 147                 return;
 148
 149         ifname = udev_device_get_sysname(udev_device);
 150         ofono_modem_set_string(modem, "Interface", ifname);
 151
 152         DBG("interface %s", ifname);
 153
 154         ofono_modem_register(modem);
 155 }
 156
 157 static void add_calypso(struct ofono_modem *modem,
 158                                         struct udev_device *udev_device)
 159 {
 160         const char *devnode;
 161
 162         DBG("modem %p", modem);
 163
 164         devnode = udev_device_get_devnode(udev_device);
 165         ofono_modem_set_string(modem, "Device", devnode);
 166
 167         ofono_modem_register(modem);
 168 }
 169
 170 static void add_wavecom(struct ofono_modem *modem,
 171                                         struct udev_device *udev_device)
 172 {
 173         const char *devnode;
 174         struct udev_list_entry *entry;
 175
 176         DBG("modem %p", modem);
 177
 178         devnode = udev_device_get_devnode(udev_device);
 179         ofono_modem_set_string(modem, "Device", devnode);
 180
 181         entry = udev_device_get_properties_list_entry(udev_device);
 182         while (entry) {
 183                 const char *name = udev_list_entry_get_name(entry);
 184                 const char *value = udev_list_entry_get_value(entry);
 185
 186                 if (g_str_equal(name, "OFONO_WAVECOM_MODEL") == TRUE)
 187                         ofono_modem_set_string(modem, "Model", value);
 188
 189                 entry = udev_list_entry_get_next(entry);
 190         }
 191
 192         ofono_modem_register(modem);
 193 }
 194
 195 static void add_tc65(struct ofono_modem *modem,
 196                         struct udev_device *udev_device)
 197 {
 198         const char *devnode;
 199
 200         DBG("modem %p", modem);
 201
 202         devnode = udev_device_get_devnode(udev_device);
 203         ofono_modem_set_string(modem, "Device", devnode);
 204
 205         ofono_modem_register(modem);
 206 }
 207
 208 static void add_nokiacdma(struct ofono_modem *modem,
 209                                         struct udev_device *udev_device)
 210 {
 211         const char *devnode;
 212
 213         DBG("modem %p", modem);
 214
 215         devnode = udev_device_get_devnode(udev_device);
 216         ofono_modem_set_string(modem, "Device", devnode);
 217
 218         ofono_modem_register(modem);
 219 }
 220
 221 static void add_sim900(struct ofono_modem *modem,
 222                                         struct udev_device *udev_device)
 223 {
 224         const char *devnode;
 225
 226         DBG("modem %p", modem);
 227
 228         devnode = udev_device_get_devnode(udev_device);
 229         ofono_modem_set_string(modem, "Device", devnode);
 230
 231         ofono_modem_register(modem);
 232 }
 233
 234 static void add_modem(struct udev_device *udev_device)
 235 {
 236         struct ofono_modem *modem;
 237         struct udev_device *parent;
 238         const char *devpath, *curpath, *driver;
 239
 240         driver = get_driver(udev_device);
 241         if (driver != NULL) {
 242                 devpath = udev_device_get_devpath(udev_device);
 243                 if (devpath == NULL)
 244                         return;
 245
 246                 modem = ofono_modem_create(NULL, driver);
 247                 if (modem == NULL)
 248                         return;
 249
 250                 ofono_modem_set_string(modem, "Path", devpath);
 251
 252                 modem_list = g_slist_prepend(modem_list, modem);
 253
 254                 goto done;
 255         }
 256
 257         parent = udev_device_get_parent(udev_device);
 258         if (parent == NULL)
 259                 return;
 260
 261         driver = get_driver(parent);
 262         if (driver == NULL) {
 263                 parent = udev_device_get_parent(parent);
 264                 driver = get_driver(parent);
 265                 if (driver == NULL) {
 266                         parent = udev_device_get_parent(parent);
 267                         driver = get_driver(parent);
 268                         if (driver == NULL)
 269                                 return;
 270                 }
 271         }
 272
 273         devpath = udev_device_get_devpath(parent);
 274         if (devpath == NULL)
 275                 return;
 276
 277         modem = find_modem(devpath);
 278         if (modem == NULL) {
 279                 const char *serial = get_serial(parent);
 280
 281                 modem = ofono_modem_create(serial, driver);
 282                 if (modem == NULL)
 283                         return;
 284
 285                 ofono_modem_set_string(modem, "Path", devpath);
 286                 ofono_modem_set_integer(modem, "Registered", 0);
 287
 288                 modem_list = g_slist_prepend(modem_list, modem);
 289         }
 290
 291 done:
 292         curpath = udev_device_get_devpath(udev_device);
 293         if (curpath == NULL)
 294                 return;
 295
 296         DBG("%s (%s)", curpath, driver);
 297
 298         g_hash_table_insert(devpath_list, g_strdup(curpath), g_strdup(devpath));
 299
 300         if (g_strcmp0(driver, "ifx") == 0)
 301                 add_ifx(modem, udev_device);
 302         else if (g_strcmp0(driver, "u8500") == 0)
 303                 add_isi(modem, udev_device);
 304         else if (g_strcmp0(driver, "n900") == 0)
 305                 add_isi(modem, udev_device);
 306         else if (g_strcmp0(driver, "calypso") == 0)
 307                 add_calypso(modem, udev_device);
 308         else if (g_strcmp0(driver, "tc65") == 0)
 309                 add_tc65(modem, udev_device);
 310         else if (g_strcmp0(driver, "nokiacdma") == 0)
 311                 add_nokiacdma(modem, udev_device);
 312         else if (g_strcmp0(driver, "sim900") == 0)
 313                 add_sim900(modem, udev_device);
 314         else if (g_strcmp0(driver, "wavecom") == 0)
 315                 add_wavecom(modem, udev_device);
 316 }
 317
 318 static gboolean devpath_remove(gpointer key, gpointer value, gpointer user_data)
 319 {
 320         const char *path = value;
 321         const char *devpath = user_data;
 322
 323         DBG("%s -> %s", path, devpath);
 324
 325         return g_str_equal(path, devpath);
 326 }
 327
 328 static void remove_modem(struct udev_device *udev_device)
 329 {
 330         struct ofono_modem *modem;
 331         const char *curpath = udev_device_get_devpath(udev_device);
 332         char *devpath, *remove;
 333
 334         if (curpath == NULL)
 335                 return;
 336
 337         DBG("%s", curpath);
 338
 339         devpath = g_hash_table_lookup(devpath_list, curpath);
 340         if (devpath == NULL)
 341                 return;
 342
 343         modem = find_modem(devpath);
 344         if (modem == NULL)
 345                 return;
 346
 347         modem_list = g_slist_remove(modem_list, modem);
 348
 349         ofono_modem_remove(modem);
 350
 351         DBG("%s", devpath);
 352
 353         remove = g_strdup(devpath);
 354
 355         g_hash_table_foreach_remove(devpath_list, devpath_remove, remove);
 356
 357         g_free(remove);
 358 }
 359
 360 static void enumerate_devices(struct udev *context)
 361 {
 362         struct udev_enumerate *enumerate;
 363         struct udev_list_entry *entry;
 364
 365         enumerate = udev_enumerate_new(context);
 366         if (enumerate == NULL)
 367                 return;
 368
 369         udev_enumerate_add_match_subsystem(enumerate, "tty");
 370         udev_enumerate_add_match_subsystem(enumerate, "net");
 371         udev_enumerate_add_match_subsystem(enumerate, "hsi");
 372
 373         udev_enumerate_scan_devices(enumerate);
 374
 375         entry = udev_enumerate_get_list_entry(enumerate);
 376         while (entry) {
 377                 const char *syspath = udev_list_entry_get_name(entry);
 378                 struct udev_device *device;
 379
 380                 device = udev_device_new_from_syspath(context, syspath);
 381                 if (device != NULL) {
 382                         const char *subsystem;
 383
 384                         subsystem = udev_device_get_subsystem(device);
 385
 386                         if (g_strcmp0(subsystem, "tty") == 0 ||
 387                                         g_strcmp0(subsystem, "net") == 0 ||
 388                                         g_strcmp0(subsystem, "hsi") == 0)
 389                                 add_modem(device);
 390
 391                         udev_device_unref(device);
 392                 }
 393
 394                 entry = udev_list_entry_get_next(entry);
 395         }
 396
 397         udev_enumerate_unref(enumerate);
 398 }
 399
 400 static struct udev *udev_ctx;
 401 static struct udev_monitor *udev_mon;
 402 static guint udev_watch = 0;
 403
 404 static gboolean udev_event(GIOChannel *channel, GIOCondition cond,
 405                                                         gpointer user_data)
 406 {
 407         struct udev_device *device;
 408         const char *subsystem, *action;
 409
 410         if (cond & (G_IO_ERR | G_IO_HUP | G_IO_NVAL)) {
 411                 ofono_warn("Error with udev monitor channel");
 412                 udev_watch = 0;
 413                 return FALSE;
 414         }
 415
 416         device = udev_monitor_receive_device(udev_mon);
 417         if (device == NULL)
 418                 return TRUE;
 419
 420         subsystem = udev_device_get_subsystem(device);
 421         if (subsystem == NULL)
 422                 goto done;
 423
 424         action = udev_device_get_action(device);
 425         if (action == NULL)
 426                 goto done;
 427
 428         DBG("subsystem %s %s", subsystem, action);
 429
 430         if (g_str_equal(action, "add") == TRUE) {
 431                 if (g_strcmp0(subsystem, "tty") == 0 ||
 432                                 g_strcmp0(subsystem, "net") == 0 ||
 433                                         g_strcmp0(subsystem, "hsi") == 0)
 434                         add_modem(device);
 435         } else if (g_str_equal(action, "remove") == TRUE) {
 436                 if (g_strcmp0(subsystem, "tty") == 0 ||
 437                                 g_strcmp0(subsystem, "net") == 0 ||
 438                                         g_strcmp0(subsystem, "hsi") == 0)
 439                         remove_modem(device);
 440         }
 441
 442         DBG("subsystem %s finished", subsystem);
 443
 444 done:
 445         udev_device_unref(device);
 446
 447         return TRUE;
 448 }
 449
 450 static void udev_start(void)
 451 {
 452         GIOChannel *channel;
 453         int fd;
 454
 455         if (udev_monitor_enable_receiving(udev_mon) < 0) {
 456                 ofono_error("Failed to enable udev monitor");
 457                 return;
 458         }
 459
 460         enumerate_devices(udev_ctx);
 461
 462         fd = udev_monitor_get_fd(udev_mon);
 463
 464         channel = g_io_channel_unix_new(fd);
 465         if (channel == NULL)
 466                 return;
 467
 468         udev_watch = g_io_add_watch(channel,
 469                                 G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
 470                                                         udev_event, NULL);
 471
 472         g_io_channel_unref(channel);
 473 }
 474
 475 static int udev_init(void)
 476 {
 477         devpath_list = g_hash_table_new_full(g_str_hash, g_str_equal,
 478                                                 g_free, g_free);
 479         if (devpath_list == NULL) {
 480                 ofono_error("Failed to create udev path list");
 481                 return -ENOMEM;
 482         }
 483
 484         udev_ctx = udev_new();
 485         if (udev_ctx == NULL) {
 486                 ofono_error("Failed to create udev context");
 487                 g_hash_table_destroy(devpath_list);
 488                 return -EIO;
 489         }
 490
 491         udev_mon = udev_monitor_new_from_netlink(udev_ctx, "udev");
 492         if (udev_mon == NULL) {
 493                 ofono_error("Failed to create udev monitor");
 494                 g_hash_table_destroy(devpath_list);
 495                 udev_unref(udev_ctx);
 496                 udev_ctx = NULL;
 497                 return -EIO;
 498         }
 499
 500         udev_monitor_filter_add_match_subsystem_devtype(udev_mon, "tty", NULL);
 501         udev_monitor_filter_add_match_subsystem_devtype(udev_mon, "net", NULL);
 502         udev_monitor_filter_add_match_subsystem_devtype(udev_mon, "hsi", NULL);
 503
 504         udev_monitor_filter_update(udev_mon);
 505
 506         udev_start();
 507
 508         return 0;
 509 }
 510
 511 static void udev_exit(void)
 512 {
 513         GSList *list;
 514
 515         if (udev_watch > 0)
 516                 g_source_remove(udev_watch);
 517
 518         for (list = modem_list; list; list = list->next) {
 519                 struct ofono_modem *modem = list->data;
 520
 521                 ofono_modem_remove(modem);
 522         }
 523
 524         g_slist_free(modem_list);
 525         modem_list = NULL;
 526
 527         g_hash_table_destroy(devpath_list);
 528         devpath_list = NULL;
 529
 530         if (udev_ctx == NULL)
 531                 return;
 532
 533         udev_monitor_filter_remove(udev_mon);
 534
 535         udev_monitor_unref(udev_mon);
 536         udev_unref(udev_ctx);
 537 }
 538
 539 OFONO_PLUGIN_DEFINE(udev, "udev hardware detection", VERSION,
 540                         OFONO_PLUGIN_PRIORITY_DEFAULT, udev_init, udev_exit)