src/modules/module-hal-detect.c

   1 /***
   2     This file is part of PulseAudio.
   3
   4     Copyright 2006 Lennart Poettering
   5     Copyright 2006 Shams E. King
   6
   7     PulseAudio is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU Lesser General Public License as published
   9     by the Free Software Foundation; either version 2.1 of the License,
  10     or (at your option) any later version.
  11
  12     PulseAudio is distributed in the hope that it will be useful, but
  13     WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15     General Public License for more details.
  16
  17     You should have received a copy of the GNU Lesser General Public License
  18     along with PulseAudio; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20     USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <stdlib.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35
  36 #include <pulse/xmalloc.h>
  37 #include <pulse/timeval.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/hashmap.h>
  43 #include <pulsecore/idxset.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/namereg.h>
  46 #include <pulsecore/core-scache.h>
  47 #include <pulsecore/modargs.h>
  48 #include <pulsecore/dbus-shared.h>
  49
  50 #include <hal/libhal.h>
  51
  52 #include "module-hal-detect-symdef.h"
  53
  54 PA_MODULE_AUTHOR("Shahms King");
  55 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
  56 PA_MODULE_VERSION(PACKAGE_VERSION);
  57 PA_MODULE_LOAD_ONCE(TRUE);
  58 #if defined(HAVE_ALSA) && defined(HAVE_OSS_OUTPUT)
  59 PA_MODULE_USAGE("api=<alsa or oss> "
  60                 "tsched=<enable system timer based scheduling mode?>"
  61                 "subdevices=<init all subdevices>");
  62 #elif defined(HAVE_ALSA)
  63 PA_MODULE_USAGE("api=<alsa> "
  64                 "tsched=<enable system timer based scheduling mode?>");
  65 #elif defined(HAVE_OSS_OUTPUT)
  66 PA_MODULE_USAGE("api=<oss>"
  67                 "subdevices=<init all subdevices>");
  68 #endif
  69 PA_MODULE_DEPRECATED("Please use module-udev-detect instead of module-hal-detect!");
  70
  71 struct device {
  72     char *udi, *originating_udi;
  73     char *card_name, *sink_name, *source_name;
  74     uint32_t module;
  75     pa_bool_t acl_race_fix;
  76 };
  77
  78 struct userdata {
  79     pa_core *core;
  80     LibHalContext *context;
  81     pa_dbus_connection *connection;
  82     pa_hashmap *devices; /* Every entry is indexed twice in this table: by the udi we found the device with and by the originating device's udi */
  83     const char *capability;
  84 #ifdef HAVE_ALSA
  85     pa_bool_t use_tsched;
  86 #endif
  87 #ifdef HAVE_OSS_OUTPUT
  88     pa_bool_t init_subdevs;
  89 #endif
  90 };
  91
  92 #define CAPABILITY_ALSA "alsa"
  93 #define CAPABILITY_OSS "oss"
  94
  95 static const char* const valid_modargs[] = {
  96     "api",
  97 #ifdef HAVE_ALSA
  98     "tsched",
  99 #endif
 100 #ifdef HAVE_OSS_OUTPUT
 101     "subdevices",
 102 #endif
 103     NULL
 104 };
 105
 106 static void device_free(struct device* d) {
 107     pa_assert(d);
 108
 109     pa_xfree(d->udi);
 110     pa_xfree(d->originating_udi);
 111     pa_xfree(d->sink_name);
 112     pa_xfree(d->source_name);
 113     pa_xfree(d->card_name);
 114     pa_xfree(d);
 115 }
 116
 117 static const char *strip_udi(const char *udi) {
 118     const char *slash;
 119
 120     pa_assert(udi);
 121
 122     if ((slash = strrchr(udi, '/')))
 123         return slash+1;
 124
 125     return udi;
 126 }
 127
 128 #ifdef HAVE_ALSA
 129
 130 enum alsa_type {
 131     ALSA_TYPE_PLAYBACK,
 132     ALSA_TYPE_CAPTURE,
 133     ALSA_TYPE_CONTROL,
 134     ALSA_TYPE_OTHER
 135 };
 136
 137 static enum alsa_type hal_alsa_device_get_type(LibHalContext *context, const char *udi) {
 138     char *type;
 139     enum alsa_type t = ALSA_TYPE_OTHER;
 140     DBusError error;
 141
 142     dbus_error_init(&error);
 143
 144     pa_assert(context);
 145     pa_assert(udi);
 146
 147     if (!(type = libhal_device_get_property_string(context, udi, "alsa.type", &error)))
 148         goto finish;
 149
 150     if (pa_streq(type, "playback"))
 151         t = ALSA_TYPE_PLAYBACK;
 152     else if (pa_streq(type, "capture"))
 153         t = ALSA_TYPE_CAPTURE;
 154     else if (pa_streq(type, "control"))
 155         t = ALSA_TYPE_CONTROL;
 156
 157     libhal_free_string(type);
 158
 159 finish:
 160     if (dbus_error_is_set(&error)) {
 161         pa_log_error("D-Bus error while parsing HAL ALSA data: %s: %s", error.name, error.message);
 162         dbus_error_free(&error);
 163     }
 164
 165     return t;
 166 }
 167
 168 static pa_bool_t hal_alsa_device_is_modem(LibHalContext *context, const char *udi) {
 169     char *class;
 170     pa_bool_t r = FALSE;
 171     DBusError error;
 172
 173     dbus_error_init(&error);
 174
 175     pa_assert(context);
 176     pa_assert(udi);
 177
 178     if (!(class = libhal_device_get_property_string(context, udi, "alsa.pcm_class", &error)))
 179         goto finish;
 180
 181     r = pa_streq(class, "modem");
 182     libhal_free_string(class);
 183
 184 finish:
 185     if (dbus_error_is_set(&error)) {
 186         if (!dbus_error_has_name(&error, "org.freedesktop.Hal.NoSuchProperty"))
 187             pa_log_error("D-Bus error while parsing HAL ALSA data: %s: %s", error.name, error.message);
 188         dbus_error_free(&error);
 189     }
 190
 191     return r;
 192 }
 193
 194 static int hal_device_load_alsa(struct userdata *u, const char *udi, struct device *d) {
 195     enum alsa_type type;
 196     int card;
 197     DBusError error;
 198     pa_module *m;
 199     char *args, *originating_udi = NULL, *card_name = NULL;
 200
 201     dbus_error_init(&error);
 202
 203     pa_assert(u);
 204     pa_assert(udi);
 205     pa_assert(d);
 206
 207     /* We only care for PCM devices */
 208     type = hal_alsa_device_get_type(u->context, udi);
 209
 210     /* For each ALSA card that appears the control device will be the
 211      * last one to be created, this is considered part of the ALSA
 212      * usperspace API. We rely on this and load our modules only when
 213      * the control device is available assuming that *all* device
 214      * nodes have been properly created and assigned the right ACLs at
 215      * that time. Also see:
 216      *
 217      * http://mailman.alsa-project.org/pipermail/alsa-devel/2009-April/015958.html
 218      *
 219      * and the associated thread.*/
 220
 221     if (type != ALSA_TYPE_CONTROL)
 222         goto fail;
 223
 224     /* We don't care for modems -- this is most likely not set for
 225      * control devices, so kind of pointless here. */
 226     if (hal_alsa_device_is_modem(u->context, udi))
 227         goto fail;
 228
 229     /* We store only one entry per card, hence we look for the originating device */
 230     originating_udi = libhal_device_get_property_string(u->context, udi, "alsa.originating_device", &error);
 231     if (dbus_error_is_set(&error) || !originating_udi)
 232         goto fail;
 233
 234     /* Make sure we only load one module per card */
 235     if (pa_hashmap_get(u->devices, originating_udi))
 236         goto fail;
 237
 238     /* We need the identifier */
 239     card = libhal_device_get_property_int(u->context, udi, "alsa.card", &error);
 240     if (dbus_error_is_set(&error))
 241         goto fail;
 242
 243     card_name = pa_sprintf_malloc("alsa_card.%s", strip_udi(originating_udi));
 244     args = pa_sprintf_malloc("device_id=%u name=\"%s\" card_name=\"%s\" tsched=%i card_properties=\"module-hal-detect.discovered=1\"", card, strip_udi(originating_udi), card_name, (int) u->use_tsched);
 245
 246     pa_log_debug("Loading module-alsa-card with arguments '%s'", args);
 247     m = pa_module_load(u->core, "module-alsa-card", args);
 248     pa_xfree(args);
 249
 250     if (!m)
 251         goto fail;
 252
 253     d->originating_udi = originating_udi;
 254     d->module = m->index;
 255     d->card_name = card_name;
 256
 257     return 0;
 258
 259 fail:
 260     if (dbus_error_is_set(&error)) {
 261         pa_log_error("D-Bus error while parsing HAL ALSA data: %s: %s", error.name, error.message);
 262         dbus_error_free(&error);
 263     }
 264
 265     pa_xfree(originating_udi);
 266     pa_xfree(card_name);
 267
 268     return -1;
 269 }
 270
 271 #endif
 272
 273 #ifdef HAVE_OSS_OUTPUT
 274
 275 static pa_bool_t hal_oss_device_is_pcm(LibHalContext *context, const char *udi, pa_bool_t init_subdevices) {
 276     char *class = NULL, *dev = NULL, *e;
 277     int device;
 278     pa_bool_t r = FALSE;
 279     DBusError error;
 280
 281     dbus_error_init(&error);
 282
 283     pa_assert(context);
 284     pa_assert(udi);
 285
 286     /* We only care for PCM devices */
 287     class = libhal_device_get_property_string(context, udi, "oss.type", &error);
 288     if (dbus_error_is_set(&error) || !class)
 289         goto finish;
 290
 291     if (!pa_streq(class, "pcm"))
 292         goto finish;
 293
 294     /* We don't like /dev/audio */
 295     dev = libhal_device_get_property_string(context, udi, "oss.device_file", &error);
 296     if (dbus_error_is_set(&error) || !dev)
 297         goto finish;
 298
 299     if ((e = strrchr(dev, '/')))
 300         if (pa_startswith(e + 1, "audio"))
 301             goto finish;
 302
 303     /* We only care for the main device */
 304     device = libhal_device_get_property_int(context, udi, "oss.device", &error);
 305     if (dbus_error_is_set(&error) || (device != 0 && init_subdevices == FALSE))
 306         goto finish;
 307
 308     r = TRUE;
 309
 310 finish:
 311
 312     if (dbus_error_is_set(&error)) {
 313         pa_log_error("D-Bus error while parsing HAL OSS data: %s: %s", error.name, error.message);
 314         dbus_error_free(&error);
 315     }
 316
 317     libhal_free_string(class);
 318     libhal_free_string(dev);
 319
 320     return r;
 321 }
 322
 323 static int hal_device_load_oss(struct userdata *u, const char *udi, struct device *d) {
 324     DBusError error;
 325     pa_module *m;
 326     char *args, *originating_udi = NULL, *device, *sink_name = NULL, *source_name = NULL;
 327
 328     dbus_error_init(&error);
 329
 330     pa_assert(u);
 331     pa_assert(udi);
 332     pa_assert(d);
 333
 334     /* We only care for OSS PCM devices */
 335     if (!hal_oss_device_is_pcm(u->context, udi, u->init_subdevs))
 336         goto fail;
 337
 338     /* We store only one entry per card, hence we look for the originating device */
 339     originating_udi = libhal_device_get_property_string(u->context, udi, "oss.originating_device", &error);
 340     if (dbus_error_is_set(&error) || !originating_udi)
 341         goto fail;
 342
 343     /* Make sure we only load one module per card */
 344     if (pa_hashmap_get(u->devices, originating_udi))
 345         goto fail;
 346
 347     /* We need the device file */
 348     device = libhal_device_get_property_string(u->context, udi, "oss.device_file", &error);
 349     if (!device || dbus_error_is_set(&error))
 350         goto fail;
 351
 352     sink_name = pa_sprintf_malloc("oss_output.%s", strip_udi(udi));
 353     source_name = pa_sprintf_malloc("oss_input.%s", strip_udi(udi));
 354     args = pa_sprintf_malloc("device=%s sink_name=%s source_name=%s", device, sink_name, source_name);
 355
 356     libhal_free_string(device);
 357
 358     pa_log_debug("Loading module-oss with arguments '%s'", args);
 359     m = pa_module_load(u->core, "module-oss", args);
 360     pa_xfree(args);
 361
 362     if (!m)
 363         goto fail;
 364
 365     d->originating_udi = originating_udi;
 366     d->module = m->index;
 367     d->sink_name = sink_name;
 368     d->source_name = source_name;
 369
 370     return 0;
 371
 372 fail:
 373     if (dbus_error_is_set(&error)) {
 374         pa_log_error("D-Bus error while parsing OSS HAL data: %s: %s", error.name, error.message);
 375         dbus_error_free(&error);
 376     }
 377
 378     pa_xfree(originating_udi);
 379     pa_xfree(source_name);
 380     pa_xfree(sink_name);
 381
 382     return -1;
 383 }
 384 #endif
 385
 386 static struct device* hal_device_add(struct userdata *u, const char *udi) {
 387     struct device *d;
 388     int r;
 389
 390     pa_assert(u);
 391     pa_assert(u->capability);
 392
 393     d = pa_xnew(struct device, 1);
 394     d->acl_race_fix = FALSE;
 395     d->udi = pa_xstrdup(udi);
 396     d->originating_udi = NULL;
 397     d->module = PA_INVALID_INDEX;
 398     d->sink_name = d->source_name = d->card_name = NULL;
 399     r = -1;
 400
 401 #ifdef HAVE_ALSA
 402     if (pa_streq(u->capability, CAPABILITY_ALSA))
 403         r = hal_device_load_alsa(u, udi,  d);
 404 #endif
 405 #ifdef HAVE_OSS_OUTPUT
 406     if (pa_streq(u->capability, CAPABILITY_OSS))
 407         r = hal_device_load_oss(u, udi, d);
 408 #endif
 409
 410     if (r < 0) {
 411         device_free(d);
 412         return NULL;
 413     }
 414
 415     pa_hashmap_put(u->devices, d->udi, d);
 416     pa_hashmap_put(u->devices, d->originating_udi, d);
 417
 418     return d;
 419 }
 420
 421 static int hal_device_add_all(struct userdata *u) {
 422     int n, count = 0;
 423     char** udis;
 424     DBusError error;
 425
 426     dbus_error_init(&error);
 427
 428     pa_assert(u);
 429
 430     udis = libhal_find_device_by_capability(u->context, u->capability, &n, &error);
 431     if (dbus_error_is_set(&error) || !udis)
 432         goto fail;
 433
 434     if (n > 0) {
 435         int i;
 436
 437         for (i = 0; i < n; i++) {
 438             struct device *d;
 439
 440             if ((d = hal_device_add(u, udis[i]))) {
 441                 count++;
 442                 pa_log_debug("Loaded device %s", udis[i]);
 443             } else
 444                 pa_log_debug("Not loaded device %s", udis[i]);
 445         }
 446     }
 447
 448     libhal_free_string_array(udis);
 449
 450     return count;
 451
 452 fail:
 453     if (dbus_error_is_set(&error)) {
 454         pa_log_error("D-Bus error while parsing HAL data: %s: %s", error.name, error.message);
 455         dbus_error_free(&error);
 456     }
 457
 458     return -1;
 459 }
 460
 461 static void device_added_cb(LibHalContext *context, const char *udi) {
 462     DBusError error;
 463     struct userdata *u;
 464     pa_bool_t good = FALSE;
 465
 466     dbus_error_init(&error);
 467
 468     pa_assert(context);
 469     pa_assert(udi);
 470
 471     pa_assert_se(u = libhal_ctx_get_user_data(context));
 472
 473     good = libhal_device_query_capability(context, udi, u->capability, &error);
 474     if (dbus_error_is_set(&error) || !good)
 475         goto finish;
 476
 477     if (!hal_device_add(u, udi))
 478         pa_log_debug("Not loaded device %s", udi);
 479     else
 480         pa_log_debug("Loaded device %s", udi);
 481
 482 finish:
 483     if (dbus_error_is_set(&error)) {
 484         if (!dbus_error_has_name(&error, "org.freedesktop.Hal.NoSuchProperty"))
 485             pa_log_error("D-Bus error while parsing HAL data: %s: %s", error.name, error.message);
 486         dbus_error_free(&error);
 487     }
 488 }
 489
 490 static void device_removed_cb(LibHalContext* context, const char *udi) {
 491     struct device *d;
 492     struct userdata *u;
 493
 494     pa_assert(context);
 495     pa_assert(udi);
 496
 497     pa_assert_se(u = libhal_ctx_get_user_data(context));
 498
 499     if (!(d = pa_hashmap_get(u->devices, udi)))
 500         return;
 501
 502     pa_hashmap_remove(u->devices, d->originating_udi);
 503     pa_hashmap_remove(u->devices, d->udi);
 504
 505     pa_log_debug("Removing HAL device: %s", d->originating_udi);
 506
 507     pa_module_unload_request_by_index(u->core, d->module, TRUE);
 508     device_free(d);
 509 }
 510
 511 static void new_capability_cb(LibHalContext *context, const char *udi, const char* capability) {
 512     struct userdata *u;
 513
 514     pa_assert(context);
 515     pa_assert(udi);
 516     pa_assert(capability);
 517
 518     pa_assert_se(u = libhal_ctx_get_user_data(context));
 519
 520     if (pa_streq(u->capability, capability))
 521         /* capability we care about, pretend it's a new device */
 522         device_added_cb(context, udi);
 523 }
 524
 525 static void lost_capability_cb(LibHalContext *context, const char *udi, const char* capability) {
 526     struct userdata *u;
 527
 528     pa_assert(context);
 529     pa_assert(udi);
 530     pa_assert(capability);
 531
 532     pa_assert_se(u = libhal_ctx_get_user_data(context));
 533
 534     if (pa_streq(u->capability, capability))
 535         /* capability we care about, pretend it was removed */
 536         device_removed_cb(context, udi);
 537 }
 538
 539 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 540     struct userdata*u;
 541     DBusError error;
 542
 543     pa_assert(bus);
 544     pa_assert(message);
 545     pa_assert_se(u = userdata);
 546
 547     dbus_error_init(&error);
 548
 549     pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
 550                  dbus_message_get_interface(message),
 551                  dbus_message_get_path(message),
 552                  dbus_message_get_member(message));
 553
 554     if (dbus_message_is_signal(message, "org.freedesktop.Hal.Device.AccessControl", "ACLAdded") ||
 555         dbus_message_is_signal(message, "org.freedesktop.Hal.Device.AccessControl", "ACLRemoved")) {
 556         uint32_t uid;
 557         pa_bool_t suspend = strcmp(dbus_message_get_member(message), "ACLRemoved") == 0;
 558
 559         if (!dbus_message_get_args(message, &error, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID) || dbus_error_is_set(&error)) {
 560             pa_log_error("Failed to parse ACL message: %s: %s", error.name, error.message);
 561             goto finish;
 562         }
 563
 564         /* Check if this is about us? */
 565         if (uid == getuid() || uid == geteuid()) {
 566             struct device *d;
 567             const char *udi;
 568
 569             udi = dbus_message_get_path(message);
 570
 571             if ((d = pa_hashmap_get(u->devices, udi))) {
 572                 pa_bool_t send_acl_race_fix_message = FALSE;
 573                 d->acl_race_fix = FALSE;
 574
 575                 if (d->sink_name) {
 576                     pa_sink *sink;
 577
 578                     if ((sink = pa_namereg_get(u->core, d->sink_name, PA_NAMEREG_SINK))) {
 579                         pa_bool_t success = pa_sink_suspend(sink, suspend, PA_SUSPEND_SESSION) >= 0;
 580
 581                         if (!success && !suspend)
 582                             d->acl_race_fix = TRUE; /* resume failed, let's try again */
 583                         else if (suspend)
 584                             send_acl_race_fix_message = TRUE; /* suspend finished, let's tell everyone to try again */
 585                     }
 586                 }
 587
 588                 if (d->source_name) {
 589                     pa_source *source;
 590
 591                     if ((source = pa_namereg_get(u->core, d->source_name, PA_NAMEREG_SOURCE))) {
 592                         pa_bool_t success = pa_source_suspend(source, suspend, PA_SUSPEND_SESSION) >= 0;
 593
 594                         if (!success && !suspend)
 595                             d->acl_race_fix = TRUE; /* resume failed, let's try again */
 596                         else if (suspend)
 597                             send_acl_race_fix_message = TRUE; /* suspend finished, let's tell everyone to try again */
 598                     }
 599                 }
 600
 601                 if (d->card_name) {
 602                     pa_card *card;
 603
 604                     if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD))) {
 605                         pa_bool_t success = pa_card_suspend(card, suspend, PA_SUSPEND_SESSION) >= 0;
 606
 607                         if (!success && !suspend)
 608                             d->acl_race_fix = TRUE; /* resume failed, let's try again */
 609                         else if (suspend)
 610                             send_acl_race_fix_message = TRUE; /* suspend finished, let's tell everyone to try again */
 611                     }
 612                 }
 613
 614                 if (send_acl_race_fix_message) {
 615                     DBusMessage *msg;
 616                     msg = dbus_message_new_signal(udi, "org.pulseaudio.Server", "DirtyGiveUpMessage");
 617                     dbus_connection_send(pa_dbus_connection_get(u->connection), msg, NULL);
 618                     dbus_message_unref(msg);
 619                 }
 620
 621             } else if (!suspend)
 622                 device_added_cb(u->context, udi);
 623
 624         }
 625
 626         return DBUS_HANDLER_RESULT_HANDLED;
 627
 628     } else if (dbus_message_is_signal(message, "org.pulseaudio.Server", "DirtyGiveUpMessage")) {
 629         /* We use this message to avoid a dirty race condition when we
 630            get an ACLAdded message before the previously owning PA
 631            sever has closed the device. We can remove this as
 632            soon as HAL learns frevoke() */
 633
 634         struct device *d;
 635         const char *udi;
 636
 637         udi = dbus_message_get_path(message);
 638
 639         if ((d = pa_hashmap_get(u->devices, udi))) {
 640
 641             if (d->acl_race_fix) {
 642                 d->acl_race_fix = FALSE;
 643                 pa_log_debug("Got dirty give up message for '%s', trying resume ...", udi);
 644
 645                 if (d->sink_name) {
 646                     pa_sink *sink;
 647
 648                     if ((sink = pa_namereg_get(u->core, d->sink_name, PA_NAMEREG_SINK)))
 649                         pa_sink_suspend(sink, FALSE, PA_SUSPEND_SESSION);
 650                 }
 651
 652                 if (d->source_name) {
 653                     pa_source *source;
 654
 655                     if ((source = pa_namereg_get(u->core, d->source_name, PA_NAMEREG_SOURCE)))
 656                         pa_source_suspend(source, FALSE, PA_SUSPEND_SESSION);
 657                 }
 658
 659                 if (d->card_name) {
 660                     pa_card *card;
 661
 662                     if ((card = pa_namereg_get(u->core, d->source_name, PA_NAMEREG_CARD)))
 663                         pa_card_suspend(card, FALSE, PA_SUSPEND_SESSION);
 664                 }
 665             }
 666
 667         } else
 668             /* Yes, we don't check the UDI for validity, but hopefully HAL will */
 669             device_added_cb(u->context, udi);
 670
 671         return DBUS_HANDLER_RESULT_HANDLED;
 672     }
 673
 674 finish:
 675     dbus_error_free(&error);
 676
 677     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 678 }
 679
 680 static void hal_context_free(LibHalContext* hal_context) {
 681     DBusError error;
 682
 683     dbus_error_init(&error);
 684
 685     libhal_ctx_shutdown(hal_context, &error);
 686     libhal_ctx_free(hal_context);
 687
 688     dbus_error_free(&error);
 689 }
 690
 691 static LibHalContext* hal_context_new(DBusConnection *connection) {
 692     DBusError error;
 693     LibHalContext *hal_context = NULL;
 694
 695     dbus_error_init(&error);
 696
 697     pa_assert(connection);
 698
 699     if (!(hal_context = libhal_ctx_new())) {
 700         pa_log_error("libhal_ctx_new() failed");
 701         goto fail;
 702     }
 703
 704     if (!libhal_ctx_set_dbus_connection(hal_context, connection)) {
 705         pa_log_error("Error establishing DBUS connection: %s: %s", error.name, error.message);
 706         goto fail;
 707     }
 708
 709     if (!libhal_ctx_init(hal_context, &error)) {
 710         pa_log_error("Couldn't connect to hald: %s: %s", error.name, error.message);
 711         goto fail;
 712     }
 713
 714     return hal_context;
 715
 716 fail:
 717     if (hal_context)
 718         hal_context_free(hal_context);
 719
 720     dbus_error_free(&error);
 721
 722     return NULL;
 723 }
 724
 725 int pa__init(pa_module*m) {
 726     DBusError error;
 727     struct userdata *u = NULL;
 728     int n = 0;
 729     pa_modargs *ma;
 730     const char *api;
 731
 732     pa_assert(m);
 733
 734     dbus_error_init(&error);
 735
 736     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 737         pa_log("Failed to parse module arguments");
 738         goto fail;
 739     }
 740
 741     m->userdata = u = pa_xnew(struct userdata, 1);
 742     u->core = m->core;
 743     u->context = NULL;
 744     u->connection = NULL;
 745     u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 746     u->capability = NULL;
 747
 748 #ifdef HAVE_ALSA
 749     u->use_tsched = TRUE;
 750
 751     if (pa_modargs_get_value_boolean(ma, "tsched", &u->use_tsched) < 0) {
 752         pa_log("Failed to parse tsched argument.");
 753         goto fail;
 754     }
 755
 756     api = pa_modargs_get_value(ma, "api", "alsa");
 757
 758     if (pa_streq(api, "alsa"))
 759         u->capability = CAPABILITY_ALSA;
 760 #else
 761     api = pa_modargs_get_value(ma, "api", "oss");
 762 #endif
 763
 764 #ifdef HAVE_OSS_OUTPUT
 765     if (pa_streq(api, "oss"))
 766         u->capability = CAPABILITY_OSS;
 767 #endif
 768
 769     if (!u->capability) {
 770         pa_log_error("Invalid API specification.");
 771         goto fail;
 772     }
 773
 774 #ifdef HAVE_OSS_OUTPUT
 775     if (pa_modargs_get_value_boolean(ma, "subdevices", &u->init_subdevs) < 0) {
 776         pa_log("Failed to parse subdevices= argument.");
 777         goto fail;
 778     }
 779 #endif
 780
 781     if (!(u->connection = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 782         pa_log_error("Unable to contact DBUS system bus: %s: %s", error.name, error.message);
 783         goto fail;
 784     }
 785
 786     if (!(u->context = hal_context_new(pa_dbus_connection_get(u->connection)))) {
 787         /* pa_hal_context_new() logs appropriate errors */
 788         goto fail;
 789     }
 790
 791     n = hal_device_add_all(u);
 792
 793     libhal_ctx_set_user_data(u->context, u);
 794     libhal_ctx_set_device_added(u->context, device_added_cb);
 795     libhal_ctx_set_device_removed(u->context, device_removed_cb);
 796     libhal_ctx_set_device_new_capability(u->context, new_capability_cb);
 797     libhal_ctx_set_device_lost_capability(u->context, lost_capability_cb);
 798
 799     if (!libhal_device_property_watch_all(u->context, &error)) {
 800         pa_log_error("Error monitoring device list: %s: %s", error.name, error.message);
 801         goto fail;
 802     }
 803
 804     if (!dbus_connection_add_filter(pa_dbus_connection_get(u->connection), filter_cb, u, NULL)) {
 805         pa_log_error("Failed to add filter function");
 806         goto fail;
 807     }
 808
 809     if (pa_dbus_add_matches(
 810                 pa_dbus_connection_get(u->connection), &error,
 811                 "type='signal',sender='org.freedesktop.Hal',interface='org.freedesktop.Hal.Device.AccessControl',member='ACLAdded'",
 812                 "type='signal',sender='org.freedesktop.Hal',interface='org.freedesktop.Hal.Device.AccessControl',member='ACLRemoved'",
 813                 "type='signal',interface='org.pulseaudio.Server',member='DirtyGiveUpMessage'", NULL) < 0) {
 814         pa_log_error("Unable to subscribe to HAL ACL signals: %s: %s", error.name, error.message);
 815         goto fail;
 816     }
 817
 818     pa_log_info("Loaded %i modules.", n);
 819
 820     pa_modargs_free(ma);
 821
 822     return 0;
 823
 824 fail:
 825     if (ma)
 826         pa_modargs_free(ma);
 827
 828     dbus_error_free(&error);
 829     pa__done(m);
 830
 831     return -1;
 832 }
 833
 834 void pa__done(pa_module *m) {
 835     struct userdata *u;
 836
 837     pa_assert(m);
 838
 839     if (!(u = m->userdata))
 840         return;
 841
 842     if (u->context)
 843         hal_context_free(u->context);
 844
 845     if (u->devices) {
 846         struct device *d;
 847
 848         while ((d = pa_hashmap_first(u->devices))) {
 849             pa_hashmap_remove(u->devices, d->udi);
 850             pa_hashmap_remove(u->devices, d->originating_udi);
 851             device_free(d);
 852         }
 853
 854         pa_hashmap_free(u->devices, NULL, NULL);
 855     }
 856
 857     if (u->connection) {
 858         pa_dbus_remove_matches(
 859                 pa_dbus_connection_get(u->connection),
 860                 "type='signal',sender='org.freedesktop.Hal',interface='org.freedesktop.Hal.Device.AccessControl',member='ACLAdded'",
 861                 "type='signal',sender='org.freedesktop.Hal',interface='org.freedesktop.Hal.Device.AccessControl',member='ACLRemoved'",
 862                 "type='signal',interface='org.pulseaudio.Server',member='DirtyGiveUpMessage'", NULL);
 863
 864         dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);
 865         pa_dbus_connection_unref(u->connection);
 866     }
 867
 868     pa_xfree(u);
 869 }