code.delx.au - pulseaudio/blob - src/modules/module-hal-detect.c

   1 /* $Id$ */
   2
   3 /***
   4     This file is part of PulseAudio.
   5
   6     Copyright 2006 Lennart Poettering
   7     Copyright 2006 Shams E. King
   8
   9     PulseAudio is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU Lesser General Public License as published
  11     by the Free Software Foundation; either version 2 of the License,
  12     or (at your option) any later version.
  13
  14     PulseAudio is distributed in the hope that it will be useful, but
  15     WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17     General Public License for more details.
  18
  19     You should have received a copy of the GNU Lesser General Public License
  20     along with PulseAudio; if not, write to the Free Software
  21     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22     USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <errno.h>
  34 #include <stdlib.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37
  38 #include <pulse/xmalloc.h>
  39 #include <pulse/timeval.h>
  40
  41 #include <pulsecore/core-error.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/log.h>
  44 #include <pulsecore/hashmap.h>
  45 #include <pulsecore/idxset.h>
  46 #include <pulsecore/core-util.h>
  47 #include <pulsecore/namereg.h>
  48 #include <pulsecore/core-scache.h>
  49 #include <pulsecore/modargs.h>
  50
  51 #include <hal/libhal.h>
  52
  53 #include "dbus-util.h"
  54 #include "module-hal-detect-symdef.h"
  55
  56 PA_MODULE_AUTHOR("Shahms King");
  57 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
  58 PA_MODULE_VERSION(PACKAGE_VERSION);
  59 PA_MODULE_LOAD_ONCE(TRUE);
  60 #if defined(HAVE_ALSA) && defined(HAVE_OSS)
  61 PA_MODULE_USAGE("api=<alsa or oss>");
  62 #elif defined(HAVE_ALSA)
  63 PA_MODULE_USAGE("api=<alsa>");
  64 #elif defined(HAVE_OSS)
  65 PA_MODULE_USAGE("api=<oss>");
  66 #endif
  67
  68 struct device {
  69     uint32_t index;
  70     char *udi;
  71     char *sink_name, *source_name;
  72     int acl_race_fix;
  73 };
  74
  75 struct userdata {
  76     pa_core *core;
  77     LibHalContext *context;
  78     pa_dbus_connection *connection;
  79     pa_hashmap *devices;
  80     const char *capability;
  81 };
  82
  83 struct timerdata {
  84     struct userdata *u;
  85     char *udi;
  86 };
  87
  88 #define CAPABILITY_ALSA "alsa"
  89 #define CAPABILITY_OSS "oss"
  90
  91 static const char* const valid_modargs[] = {
  92     "api",
  93     NULL
  94 };
  95
  96 static void hal_device_free(struct device* d) {
  97     pa_assert(d);
  98
  99     pa_xfree(d->udi);
 100     pa_xfree(d->sink_name);
 101     pa_xfree(d->source_name);
 102     pa_xfree(d);
 103 }
 104
 105 static void hal_device_free_cb(void *d, PA_GCC_UNUSED void *data) {
 106     hal_device_free(d);
 107 }
 108
 109 static const char *strip_udi(const char *udi) {
 110     const char *slash;
 111
 112     if ((slash = strrchr(udi, '/')))
 113         return slash+1;
 114
 115     return udi;
 116 }
 117
 118 #ifdef HAVE_ALSA
 119
 120 typedef enum {
 121     ALSA_TYPE_SINK,
 122     ALSA_TYPE_SOURCE,
 123     ALSA_TYPE_OTHER,
 124     ALSA_TYPE_MAX
 125 } alsa_type_t;
 126
 127 static alsa_type_t hal_alsa_device_get_type(LibHalContext *context, const char *udi, DBusError *error) {
 128     char *type;
 129     alsa_type_t t;
 130
 131     if (!(type = libhal_device_get_property_string(context, udi, "alsa.type", error)))
 132         return ALSA_TYPE_OTHER;
 133
 134     if (!strcmp(type, "playback"))
 135         t = ALSA_TYPE_SINK;
 136     else if (!strcmp(type, "capture"))
 137         t = ALSA_TYPE_SOURCE;
 138     else
 139         t = ALSA_TYPE_OTHER;
 140
 141     libhal_free_string(type);
 142
 143     return t;
 144 }
 145
 146 static int hal_alsa_device_is_modem(LibHalContext *context, const char *udi, DBusError *error) {
 147     char *class;
 148     int r;
 149
 150     if (!(class = libhal_device_get_property_string(context, udi, "alsa.pcm_class", error)))
 151         return 0;
 152
 153     r = strcmp(class, "modem") == 0;
 154     pa_xfree(class);
 155
 156     return r;
 157 }
 158
 159 static pa_module* hal_device_load_alsa(struct userdata *u, const char *udi, char **sink_name, char **source_name) {
 160     char *args;
 161     alsa_type_t type;
 162     int device, card;
 163     const char *module_name;
 164     DBusError error;
 165     pa_module *m;
 166
 167     dbus_error_init(&error);
 168
 169     pa_assert(u);
 170     pa_assert(sink_name);
 171     pa_assert(source_name);
 172
 173     *sink_name = *source_name = NULL;
 174
 175     type = hal_alsa_device_get_type(u->context, udi, &error);
 176     if (dbus_error_is_set(&error) || type == ALSA_TYPE_OTHER)
 177         goto fail;
 178
 179     device = libhal_device_get_property_int(u->context, udi, "alsa.device", &error);
 180     if (dbus_error_is_set(&error) || device != 0)
 181         goto fail;
 182
 183     card = libhal_device_get_property_int(u->context, udi, "alsa.card", &error);
 184     if (dbus_error_is_set(&error))
 185         goto fail;
 186
 187     if (hal_alsa_device_is_modem(u->context, udi, &error))
 188         goto fail;
 189
 190     if (type == ALSA_TYPE_SINK) {
 191         *sink_name = pa_sprintf_malloc("alsa_output.%s", strip_udi(udi));
 192
 193         module_name = "module-alsa-sink";
 194         args = pa_sprintf_malloc("device_id=%u sink_name=%s", card, *sink_name);
 195     } else {
 196         *source_name = pa_sprintf_malloc("alsa_input.%s", strip_udi(udi));
 197
 198         module_name = "module-alsa-source";
 199         args = pa_sprintf_malloc("device_id=%u source_name=%s", card, *source_name);
 200     }
 201
 202     pa_log_debug("Loading %s with arguments '%s'", module_name, args);
 203
 204     m = pa_module_load(u->core, module_name, args);
 205
 206     pa_xfree(args);
 207
 208     if (!m) {
 209         pa_xfree(*sink_name);
 210         pa_xfree(*source_name);
 211         *sink_name = *source_name = NULL;
 212     }
 213
 214     return m;
 215
 216 fail:
 217     if (dbus_error_is_set(&error)) {
 218         pa_log_error("D-Bus error while parsing ALSA data: %s: %s", error.name, error.message);
 219         dbus_error_free(&error);
 220     }
 221
 222     return NULL;
 223 }
 224
 225 #endif
 226
 227 #ifdef HAVE_OSS
 228
 229 static int hal_oss_device_is_pcm(LibHalContext *context, const char *udi, DBusError *error) {
 230     char *class = NULL, *dev = NULL, *e;
 231     int device;
 232     int r = 0;
 233
 234     class = libhal_device_get_property_string(context, udi, "oss.type", error);
 235     if (dbus_error_is_set(error) || !class)
 236         goto finish;
 237
 238     if (strcmp(class, "pcm"))
 239         goto finish;
 240
 241     dev = libhal_device_get_property_string(context, udi, "oss.device_file", error);
 242     if (dbus_error_is_set(error) || !dev)
 243         goto finish;
 244
 245     if ((e = strrchr(dev, '/')))
 246         if (pa_startswith(e + 1, "audio"))
 247             goto finish;
 248
 249     device = libhal_device_get_property_int(context, udi, "oss.device", error);
 250     if (dbus_error_is_set(error) || device != 0)
 251         goto finish;
 252
 253     r = 1;
 254
 255 finish:
 256
 257     libhal_free_string(class);
 258     libhal_free_string(dev);
 259
 260     return r;
 261 }
 262
 263 static pa_module* hal_device_load_oss(struct userdata *u, const char *udi, char **sink_name, char **source_name) {
 264     char* args;
 265     char* device;
 266     DBusError error;
 267     pa_module *m;
 268
 269     dbus_error_init(&error);
 270
 271     pa_assert(u);
 272     pa_assert(sink_name);
 273     pa_assert(source_name);
 274
 275     *sink_name = *source_name = NULL;
 276
 277     if (!hal_oss_device_is_pcm(u->context, udi, &error) || dbus_error_is_set(&error))
 278         goto fail;
 279
 280     device = libhal_device_get_property_string(u->context, udi, "oss.device_file", &error);
 281     if (!device || dbus_error_is_set(&error))
 282         goto fail;
 283
 284     *sink_name = pa_sprintf_malloc("oss_output.%s", strip_udi(udi));
 285     *source_name = pa_sprintf_malloc("oss_input.%s", strip_udi(udi));
 286
 287     args = pa_sprintf_malloc("device=%s sink_name=%s source_name=%s", device, *sink_name, *source_name);
 288     libhal_free_string(device);
 289
 290     pa_log_debug("Loading module-oss with arguments '%s'", args);
 291     m = pa_module_load(u->core, "module-oss", args);
 292     pa_xfree(args);
 293
 294     if (!m) {
 295         pa_xfree(*sink_name);
 296         pa_xfree(*source_name);
 297         *sink_name = *source_name = NULL;
 298     }
 299
 300     return m;
 301
 302 fail:
 303     if (dbus_error_is_set(&error)) {
 304         pa_log_error("D-Bus error while parsing OSS data: %s: %s", error.name, error.message);
 305         dbus_error_free(&error);
 306     }
 307
 308     return NULL;
 309 }
 310 #endif
 311
 312 static struct device* hal_device_add(struct userdata *u, const char *udi) {
 313     pa_module* m = NULL;
 314     struct device *d;
 315     char *sink_name = NULL, *source_name = NULL;
 316
 317     pa_assert(u);
 318     pa_assert(u->capability);
 319     pa_assert(!pa_hashmap_get(u->devices, udi));
 320
 321 #ifdef HAVE_ALSA
 322     if (strcmp(u->capability, CAPABILITY_ALSA) == 0)
 323         m = hal_device_load_alsa(u, udi, &sink_name, &source_name);
 324 #endif
 325 #ifdef HAVE_OSS
 326     if (strcmp(u->capability, CAPABILITY_OSS) == 0)
 327         m = hal_device_load_oss(u, udi, &sink_name, &source_name);
 328 #endif
 329
 330     if (!m)
 331         return NULL;
 332
 333     d = pa_xnew(struct device, 1);
 334     d->acl_race_fix = 0;
 335     d->udi = pa_xstrdup(udi);
 336     d->index = m->index;
 337     d->sink_name = sink_name;
 338     d->source_name = source_name;
 339     pa_hashmap_put(u->devices, d->udi, d);
 340
 341     return d;
 342 }
 343
 344 static int hal_device_add_all(struct userdata *u, const char *capability) {
 345     DBusError error;
 346     int i, n, count = 0;
 347     char** udis;
 348
 349     pa_assert(u);
 350
 351     dbus_error_init(&error);
 352
 353     if (u->capability && strcmp(u->capability, capability) != 0)
 354         return 0;
 355
 356     pa_log_info("Trying capability %s", capability);
 357
 358     udis = libhal_find_device_by_capability(u->context, capability, &n, &error);
 359     if (dbus_error_is_set(&error)) {
 360         pa_log_error("Error finding devices: %s: %s", error.name, error.message);
 361         dbus_error_free(&error);
 362         return -1;
 363     }
 364
 365     if (n > 0) {
 366         u->capability = capability;
 367
 368         for (i = 0; i < n; i++) {
 369             struct device *d;
 370
 371             if (!(d = hal_device_add(u, udis[i])))
 372                 pa_log_debug("Not loaded device %s", udis[i]);
 373             else {
 374                 if (d->sink_name)
 375                     pa_scache_play_item_by_name(u->core, "pulse-coldplug", d->sink_name, FALSE, PA_VOLUME_NORM, NULL, NULL);
 376                 count++;
 377             }
 378         }
 379     }
 380
 381     libhal_free_string_array(udis);
 382     return count;
 383 }
 384
 385 static dbus_bool_t device_has_capability(LibHalContext *context, const char *udi, const char* cap, DBusError *error){
 386     dbus_bool_t has_prop;
 387
 388     has_prop = libhal_device_property_exists(context, udi, "info.capabilities", error);
 389     if (!has_prop || dbus_error_is_set(error))
 390         return FALSE;
 391
 392     return libhal_device_query_capability(context, udi, cap, error);
 393 }
 394
 395 static void device_added_time_cb(pa_mainloop_api *ea, pa_time_event *ev, const struct timeval *tv, void *userdata) {
 396     DBusError error;
 397     struct timerdata *td = userdata;
 398
 399     dbus_error_init(&error);
 400
 401     if (!pa_hashmap_get(td->u->devices, td->udi)) {
 402         int b;
 403         struct device *d;
 404
 405         b = libhal_device_exists(td->u->context, td->udi, &error);
 406
 407         if (dbus_error_is_set(&error)) {
 408             pa_log_error("Error adding device: %s: %s", error.name, error.message);
 409             dbus_error_free(&error);
 410         } else if (b) {
 411             if (!(d = hal_device_add(td->u, td->udi)))
 412                 pa_log_debug("Not loaded device %s", td->udi);
 413             else {
 414                 if (d->sink_name)
 415                     pa_scache_play_item_by_name(td->u->core, "pulse-hotplug", d->sink_name, FALSE, PA_VOLUME_NORM, NULL, NULL);
 416             }
 417         }
 418     }
 419
 420     pa_xfree(td->udi);
 421     pa_xfree(td);
 422     ea->time_free(ev);
 423 }
 424
 425 static void device_added_cb(LibHalContext *context, const char *udi) {
 426     DBusError error;
 427     struct timeval tv;
 428     struct timerdata *t;
 429     struct userdata *u;
 430     int good = 0;
 431
 432     pa_assert_se(u = libhal_ctx_get_user_data(context));
 433
 434     if (pa_hashmap_get(u->devices, udi))
 435         return;
 436
 437     pa_log_debug("HAL Device added: %s", udi);
 438
 439     dbus_error_init(&error);
 440
 441     if (u->capability) {
 442
 443         good = device_has_capability(context, udi, u->capability, &error);
 444
 445         if (dbus_error_is_set(&error)) {
 446             pa_log_error("Error getting capability: %s: %s", error.name, error.message);
 447             dbus_error_free(&error);
 448             return;
 449         }
 450
 451     } else {
 452
 453 #ifdef HAVE_ALSA
 454         good = device_has_capability(context, udi, CAPABILITY_ALSA, &error);
 455
 456         if (dbus_error_is_set(&error)) {
 457             pa_log_error("Error getting capability: %s: %s", error.name, error.message);
 458             dbus_error_free(&error);
 459             return;
 460         }
 461
 462         if (good)
 463             u->capability = CAPABILITY_ALSA;
 464 #endif
 465 #if defined(HAVE_OSS) && defined(HAVE_ALSA)
 466         if (!good) {
 467 #endif
 468 #ifdef HAS_OSS
 469             good = device_has_capability(context, udi, CAPABILITY_OSS, &error);
 470
 471             if (dbus_error_is_set(&error)) {
 472                 pa_log_error("Error getting capability: %s: %s", error.name, error.message);
 473                 dbus_error_free(&error);
 474                 return;
 475             }
 476
 477             if (good)
 478                 u->capability = CAPABILITY_OSS;
 479
 480 #endif
 481 #if defined(HAVE_OSS) && defined(HAVE_ALSA)
 482         }
 483 #endif
 484     }
 485
 486     if (!good)
 487         return;
 488
 489     /* actually add the device 1/2 second later */
 490     t = pa_xnew(struct timerdata, 1);
 491     t->u = u;
 492     t->udi = pa_xstrdup(udi);
 493
 494     pa_gettimeofday(&tv);
 495     pa_timeval_add(&tv, 500000);
 496     u->core->mainloop->time_new(u->core->mainloop, &tv, device_added_time_cb, t);
 497 }
 498
 499 static void device_removed_cb(LibHalContext* context, const char *udi) {
 500     struct device *d;
 501     struct userdata *u;
 502
 503     pa_assert_se(u = libhal_ctx_get_user_data(context));
 504
 505     pa_log_debug("Device removed: %s", udi);
 506
 507     if ((d = pa_hashmap_remove(u->devices, udi))) {
 508         pa_module_unload_by_index(u->core, d->index);
 509         hal_device_free(d);
 510     }
 511 }
 512
 513 static void new_capability_cb(LibHalContext *context, const char *udi, const char* capability) {
 514     struct userdata *u;
 515
 516     pa_assert_se(u = libhal_ctx_get_user_data(context));
 517
 518     if (!u->capability || strcmp(u->capability, capability) == 0)
 519         /* capability we care about, pretend it's a new device */
 520         device_added_cb(context, udi);
 521 }
 522
 523 static void lost_capability_cb(LibHalContext *context, const char *udi, const char* capability) {
 524     struct userdata *u;
 525
 526     pa_assert_se(u = libhal_ctx_get_user_data(context));
 527
 528     if (u->capability && strcmp(u->capability, capability) == 0)
 529         /* capability we care about, pretend it was removed */
 530         device_removed_cb(context, udi);
 531 }
 532
 533 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 534     struct userdata*u = userdata;
 535     DBusError error;
 536
 537     pa_assert(bus);
 538     pa_assert(message);
 539     pa_assert(u);
 540
 541     dbus_error_init(&error);
 542
 543     pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
 544                  dbus_message_get_interface(message),
 545                  dbus_message_get_path(message),
 546                  dbus_message_get_member(message));
 547
 548     if (dbus_message_is_signal(message, "org.freedesktop.Hal.Device.AccessControl", "ACLAdded") ||
 549         dbus_message_is_signal(message, "org.freedesktop.Hal.Device.AccessControl", "ACLRemoved")) {
 550         uint32_t uid;
 551         int suspend = strcmp(dbus_message_get_member(message), "ACLRemoved") == 0;
 552
 553         if (!dbus_message_get_args(message, &error, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID) || dbus_error_is_set(&error)) {
 554             pa_log_error("Failed to parse ACL message: %s: %s", error.name, error.message);
 555             goto finish;
 556         }
 557
 558         if (uid == getuid() || uid == geteuid()) {
 559             struct device *d;
 560             const char *udi;
 561
 562             udi = dbus_message_get_path(message);
 563
 564             if ((d = pa_hashmap_get(u->devices, udi))) {
 565                 int send_acl_race_fix_message = 0;
 566
 567                 d->acl_race_fix = 0;
 568
 569                 if (d->sink_name) {
 570                     pa_sink *sink;
 571
 572                     if ((sink = pa_namereg_get(u->core, d->sink_name, PA_NAMEREG_SINK, 0))) {
 573                         int prev_suspended = pa_sink_get_state(sink) == PA_SINK_SUSPENDED;
 574
 575                         if (prev_suspended && !suspend) {
 576                             /* resume */
 577                             if (pa_sink_suspend(sink, 0) >= 0)
 578                                 pa_scache_play_item_by_name(u->core, "pulse-access", d->sink_name, FALSE, PA_VOLUME_NORM, NULL, NULL);
 579                             else
 580                                 d->acl_race_fix = 1;
 581
 582                         } else if (!prev_suspended && suspend) {
 583                             /* suspend */
 584                             if (pa_sink_suspend(sink, 1) >= 0)
 585                                 send_acl_race_fix_message = 1;
 586                         }
 587                     }
 588                 }
 589
 590                 if (d->source_name) {
 591                     pa_source *source;
 592
 593                     if ((source = pa_namereg_get(u->core, d->source_name, PA_NAMEREG_SOURCE, 0))) {
 594                         int prev_suspended = pa_source_get_state(source) == PA_SOURCE_SUSPENDED;
 595
 596                         if (prev_suspended && !suspend) {
 597                             /* resume */
 598                             if (pa_source_suspend(source, 0) < 0)
 599                                 d->acl_race_fix = 1;
 600
 601                         } else if (!prev_suspended && suspend) {
 602                             /* suspend */
 603                             if (pa_source_suspend(source, 0) >= 0)
 604                                 send_acl_race_fix_message = 1;
 605                         }
 606                     }
 607                 }
 608
 609                 if (send_acl_race_fix_message) {
 610                     DBusMessage *msg;
 611                     msg = dbus_message_new_signal(udi, "org.pulseaudio.Server", "DirtyGiveUpMessage");
 612                     dbus_connection_send(pa_dbus_connection_get(u->connection), msg, NULL);
 613                     dbus_message_unref(msg);
 614                 }
 615
 616             } else if (!suspend)
 617                 device_added_cb(u->context, udi);
 618         }
 619
 620     } else if (dbus_message_is_signal(message, "org.pulseaudio.Server", "DirtyGiveUpMessage")) {
 621         /* We use this message to avoid a dirty race condition when we
 622            get an ACLAdded message before the previously owning PA
 623            sever has closed the device. We can remove this as
 624            soon as HAL learns frevoke() */
 625
 626         const char *udi;
 627         struct device *d;
 628
 629         udi = dbus_message_get_path(message);
 630
 631         if ((d = pa_hashmap_get(u->devices, udi)) && d->acl_race_fix) {
 632             pa_log_debug("Got dirty give up message for '%s', trying resume ...", udi);
 633
 634             d->acl_race_fix = 0;
 635
 636             if (d->sink_name) {
 637                 pa_sink *sink;
 638
 639                 if ((sink = pa_namereg_get(u->core, d->sink_name, PA_NAMEREG_SINK, 0))) {
 640
 641                     int prev_suspended = pa_sink_get_state(sink) == PA_SINK_SUSPENDED;
 642
 643                     if (prev_suspended) {
 644                         /* resume */
 645                         if (pa_sink_suspend(sink, 0) >= 0)
 646                             pa_scache_play_item_by_name(u->core, "pulse-access", d->sink_name, FALSE, PA_VOLUME_NORM, NULL, NULL);
 647                     }
 648                 }
 649             }
 650
 651             if (d->source_name) {
 652                 pa_source *source;
 653
 654                 if ((source = pa_namereg_get(u->core, d->source_name, PA_NAMEREG_SOURCE, 0))) {
 655
 656                     int prev_suspended = pa_source_get_state(source) == PA_SOURCE_SUSPENDED;
 657
 658                     if (prev_suspended)
 659                         pa_source_suspend(source, 0);
 660                 }
 661             }
 662
 663         } else
 664             /* Yes, we don't check the UDI for validity, but hopefully HAL will */
 665             device_added_cb(u->context, udi);
 666     }
 667
 668 finish:
 669     dbus_error_free(&error);
 670
 671     return DBUS_HANDLER_RESULT_HANDLED;
 672 }
 673
 674 static void hal_context_free(LibHalContext* hal_context) {
 675     DBusError error;
 676
 677     dbus_error_init(&error);
 678
 679     libhal_ctx_shutdown(hal_context, &error);
 680     libhal_ctx_free(hal_context);
 681
 682     dbus_error_free(&error);
 683 }
 684
 685 static LibHalContext* hal_context_new(pa_core* c, DBusConnection *conn) {
 686     DBusError error;
 687     LibHalContext *hal_context = NULL;
 688
 689     dbus_error_init(&error);
 690
 691     if (!(hal_context = libhal_ctx_new())) {
 692         pa_log_error("libhal_ctx_new() failed");
 693         goto fail;
 694     }
 695
 696     if (!libhal_ctx_set_dbus_connection(hal_context, conn)) {
 697         pa_log_error("Error establishing DBUS connection: %s: %s", error.name, error.message);
 698         goto fail;
 699     }
 700
 701     if (!libhal_ctx_init(hal_context, &error)) {
 702         pa_log_error("Couldn't connect to hald: %s: %s", error.name, error.message);
 703         goto fail;
 704     }
 705
 706     return hal_context;
 707
 708 fail:
 709     if (hal_context)
 710         hal_context_free(hal_context);
 711
 712     dbus_error_free(&error);
 713
 714     return NULL;
 715 }
 716
 717 int pa__init(pa_module*m) {
 718     DBusError error;
 719     pa_dbus_connection *conn;
 720     struct userdata *u = NULL;
 721     LibHalContext *hal_context = NULL;
 722     int n = 0;
 723     pa_modargs *ma;
 724     const char *api;
 725
 726     pa_assert(m);
 727
 728     dbus_error_init(&error);
 729
 730     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 731         pa_log("Failed to parse module arguments");
 732         goto fail;
 733     }
 734
 735     if ((api = pa_modargs_get_value(ma, "api", NULL))) {
 736         int good = 0;
 737
 738 #ifdef HAVE_ALSA
 739         if (strcmp(api, CAPABILITY_ALSA) == 0) {
 740             good = 1;
 741             api = CAPABILITY_ALSA;
 742         }
 743 #endif
 744 #ifdef HAVE_OSS
 745         if (strcmp(api, CAPABILITY_OSS) == 0) {
 746             good = 1;
 747             api = CAPABILITY_OSS;
 748         }
 749 #endif
 750
 751         if (!good) {
 752             pa_log_error("Invalid API specification.");
 753             goto fail;
 754         }
 755     }
 756
 757     if (!(conn = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 758         if (conn)
 759             pa_dbus_connection_unref(conn);
 760         pa_log_error("Unable to contact DBUS system bus: %s: %s", error.name, error.message);
 761         goto fail;
 762     }
 763
 764     if (!(hal_context = hal_context_new(m->core, pa_dbus_connection_get(conn)))) {
 765         /* pa_hal_context_new() logs appropriate errors */
 766         pa_dbus_connection_unref(conn);
 767         goto fail;
 768     }
 769
 770     u = pa_xnew(struct userdata, 1);
 771     u->core = m->core;
 772     u->context = hal_context;
 773     u->connection = conn;
 774     u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 775     u->capability = api;
 776     m->userdata = u;
 777
 778 #ifdef HAVE_ALSA
 779     n = hal_device_add_all(u, CAPABILITY_ALSA);
 780 #endif
 781 #if defined(HAVE_ALSA) && defined(HAVE_OSS)
 782     if (n <= 0)
 783 #endif
 784 #ifdef HAVE_OSS
 785         n += hal_device_add_all(u, CAPABILITY_OSS);
 786 #endif
 787
 788     libhal_ctx_set_user_data(hal_context, u);
 789     libhal_ctx_set_device_added(hal_context, device_added_cb);
 790     libhal_ctx_set_device_removed(hal_context, device_removed_cb);
 791     libhal_ctx_set_device_new_capability(hal_context, new_capability_cb);
 792     libhal_ctx_set_device_lost_capability(hal_context, lost_capability_cb);
 793
 794     if (!libhal_device_property_watch_all(hal_context, &error)) {
 795         pa_log_error("Error monitoring device list: %s: %s", error.name, error.message);
 796         goto fail;
 797     }
 798
 799     if (!dbus_connection_add_filter(pa_dbus_connection_get(conn), filter_cb, u, NULL)) {
 800         pa_log_error("Failed to add filter function");
 801         goto fail;
 802     }
 803
 804     dbus_bus_add_match(pa_dbus_connection_get(conn), "type='signal',sender='org.freedesktop.Hal', interface='org.freedesktop.Hal.Device.AccessControl'", &error);
 805     if (dbus_error_is_set(&error)) {
 806         pa_log_error("Unable to subscribe to HAL ACL signals: %s: %s", error.name, error.message);
 807         goto fail;
 808     }
 809
 810     dbus_bus_add_match(pa_dbus_connection_get(conn), "type='signal',interface='org.pulseaudio.Server'", &error);
 811     if (dbus_error_is_set(&error)) {
 812         pa_log_error("Unable to subscribe to PulseAudio signals: %s: %s", error.name, error.message);
 813         goto fail;
 814     }
 815
 816     pa_log_info("Loaded %i modules.", n);
 817
 818     pa_modargs_free(ma);
 819
 820     return 0;
 821
 822 fail:
 823     if (ma)
 824         pa_modargs_free(ma);
 825
 826     dbus_error_free(&error);
 827     pa__done(m);
 828
 829     return -1;
 830 }
 831
 832
 833 void pa__done(pa_module *m) {
 834     struct userdata *u;
 835
 836     pa_assert(m);
 837
 838     if (!(u = m->userdata))
 839         return;
 840
 841     if (u->context)
 842         hal_context_free(u->context);
 843
 844     if (u->devices)
 845         pa_hashmap_free(u->devices, hal_device_free_cb, NULL);
 846
 847     if (u->connection)
 848         pa_dbus_connection_unref(u->connection);
 849
 850     pa_xfree(u);
 851 }