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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio 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   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <dirent.h>
  29 #include <sys/inotify.h>
  30 #include <libudev.h>
  31
  32 #include <pulse/timeval.h>
  33
  34 #include <pulsecore/modargs.h>
  35 #include <pulsecore/core-error.h>
  36 #include <pulsecore/core-util.h>
  37 #include <pulsecore/namereg.h>
  38 #include <pulsecore/ratelimit.h>
  39 #include <pulsecore/strbuf.h>
  40
  41 #include "module-udev-detect-symdef.h"
  42
  43 PA_MODULE_AUTHOR("Lennart Poettering");
  44 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
  45 PA_MODULE_VERSION(PACKAGE_VERSION);
  46 PA_MODULE_LOAD_ONCE(TRUE);
  47 PA_MODULE_USAGE(
  48         "tsched=<enable system timer based scheduling mode?> "
  49         "tsched_buffer_size=<buffer size when using timer based scheduling> "
  50         "fixed_latency_range=<disable latency range changes on underrun?> "
  51         "ignore_dB=<ignore dB information from the device?> "
  52         "deferred_volume=<syncronize sw and hw volume changes in IO-thread?> "
  53         "use_ucm=<use ALSA UCM for card configuration?>");
  54
  55 struct device {
  56     char *path;
  57     pa_bool_t need_verify;
  58     char *card_name;
  59     char *args;
  60     uint32_t module;
  61     pa_ratelimit ratelimit;
  62 };
  63
  64 struct userdata {
  65     pa_core *core;
  66     pa_hashmap *devices;
  67
  68     pa_bool_t use_tsched:1;
  69     bool tsched_buffer_size_valid:1;
  70     pa_bool_t fixed_latency_range:1;
  71     pa_bool_t ignore_dB:1;
  72     pa_bool_t deferred_volume:1;
  73     bool use_ucm:1;
  74
  75     uint32_t tsched_buffer_size;
  76
  77     struct udev* udev;
  78     struct udev_monitor *monitor;
  79     pa_io_event *udev_io;
  80
  81     int inotify_fd;
  82     pa_io_event *inotify_io;
  83 };
  84
  85 static const char* const valid_modargs[] = {
  86     "tsched",
  87     "tsched_buffer_size",
  88     "fixed_latency_range",
  89     "ignore_dB",
  90     "deferred_volume",
  91     "use_ucm",
  92     NULL
  93 };
  94
  95 static int setup_inotify(struct userdata *u);
  96
  97 static void device_free(struct device *d) {
  98     pa_assert(d);
  99
 100     pa_xfree(d->path);
 101     pa_xfree(d->card_name);
 102     pa_xfree(d->args);
 103     pa_xfree(d);
 104 }
 105
 106 static const char *path_get_card_id(const char *path) {
 107     const char *e;
 108
 109     if (!path)
 110         return NULL;
 111
 112     if (!(e = strrchr(path, '/')))
 113         return NULL;
 114
 115     if (!pa_startswith(e, "/card"))
 116         return NULL;
 117
 118     return e + 5;
 119 }
 120
 121 static char *card_get_sysattr(const char *card_idx, const char *name) {
 122     struct udev *udev;
 123     struct udev_device *card = NULL;
 124     char *t, *r = NULL;
 125     const char *v;
 126
 127     pa_assert(card_idx);
 128     pa_assert(name);
 129
 130     if (!(udev = udev_new())) {
 131         pa_log_error("Failed to allocate udev context.");
 132         goto finish;
 133     }
 134
 135     t = pa_sprintf_malloc("/sys/class/sound/card%s", card_idx);
 136     card = udev_device_new_from_syspath(udev, t);
 137     pa_xfree(t);
 138
 139     if (!card) {
 140         pa_log_error("Failed to get card object.");
 141         goto finish;
 142     }
 143
 144     if ((v = udev_device_get_sysattr_value(card, name)) && *v)
 145         r = pa_xstrdup(v);
 146
 147 finish:
 148
 149     if (card)
 150         udev_device_unref(card);
 151
 152     if (udev)
 153         udev_unref(udev);
 154
 155     return r;
 156 }
 157
 158 static pa_bool_t pcm_is_modem(const char *card_idx, const char *pcm) {
 159     char *sysfs_path, *pcm_class;
 160     pa_bool_t is_modem;
 161
 162     pa_assert(card_idx);
 163     pa_assert(pcm);
 164
 165     /* Check /sys/class/sound/card.../pcmC...../pcm_class. An HDA
 166      * modem can be used simultaneously with generic
 167      * playback/record. */
 168
 169     sysfs_path = pa_sprintf_malloc("pcmC%sD%s/pcm_class", card_idx, pcm);
 170     pcm_class = card_get_sysattr(card_idx, sysfs_path);
 171     is_modem = pcm_class && pa_streq(pcm_class, "modem");
 172     pa_xfree(pcm_class);
 173     pa_xfree(sysfs_path);
 174
 175     return is_modem;
 176 }
 177
 178 static pa_bool_t is_card_busy(const char *id) {
 179     char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL;
 180     DIR *card_dir = NULL, *pcm_dir = NULL;
 181     FILE *status_file = NULL;
 182     size_t len;
 183     struct dirent *space = NULL, *de;
 184     pa_bool_t busy = FALSE;
 185     int r;
 186
 187     pa_assert(id);
 188
 189     /* This simply uses /proc/asound/card.../pcm.../sub.../status to
 190      * check whether there is still a process using this audio device. */
 191
 192     card_path = pa_sprintf_malloc("/proc/asound/card%s", id);
 193
 194     if (!(card_dir = opendir(card_path))) {
 195         pa_log_warn("Failed to open %s: %s", card_path, pa_cstrerror(errno));
 196         goto fail;
 197     }
 198
 199     len = offsetof(struct dirent, d_name) + fpathconf(dirfd(card_dir), _PC_NAME_MAX) + 1;
 200     space = pa_xmalloc(len);
 201
 202     for (;;) {
 203         de = NULL;
 204
 205         if ((r = readdir_r(card_dir, space, &de)) != 0) {
 206             pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
 207             goto fail;
 208         }
 209
 210         if (!de)
 211             break;
 212
 213         if (!pa_startswith(de->d_name, "pcm"))
 214             continue;
 215
 216         if (pcm_is_modem(id, de->d_name + 3))
 217             continue;
 218
 219         pa_xfree(pcm_path);
 220         pcm_path = pa_sprintf_malloc("%s/%s", card_path, de->d_name);
 221
 222         if (pcm_dir)
 223             closedir(pcm_dir);
 224
 225         if (!(pcm_dir = opendir(pcm_path))) {
 226             pa_log_warn("Failed to open %s: %s", pcm_path, pa_cstrerror(errno));
 227             continue;
 228         }
 229
 230         for (;;) {
 231             char line[32];
 232
 233             if ((r = readdir_r(pcm_dir, space, &de)) != 0) {
 234                 pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
 235                 goto fail;
 236             }
 237
 238             if (!de)
 239                 break;
 240
 241             if (!pa_startswith(de->d_name, "sub"))
 242                 continue;
 243
 244             pa_xfree(sub_status);
 245             sub_status = pa_sprintf_malloc("%s/%s/status", pcm_path, de->d_name);
 246
 247             if (status_file)
 248                 fclose(status_file);
 249
 250             if (!(status_file = pa_fopen_cloexec(sub_status, "r"))) {
 251                 pa_log_warn("Failed to open %s: %s", sub_status, pa_cstrerror(errno));
 252                 continue;
 253             }
 254
 255             if (!(fgets(line, sizeof(line)-1, status_file))) {
 256                 pa_log_warn("Failed to read from %s: %s", sub_status, pa_cstrerror(errno));
 257                 continue;
 258             }
 259
 260             if (!pa_streq(line, "closed\n")) {
 261                 busy = TRUE;
 262                 break;
 263             }
 264         }
 265     }
 266
 267 fail:
 268
 269     pa_xfree(card_path);
 270     pa_xfree(pcm_path);
 271     pa_xfree(sub_status);
 272     pa_xfree(space);
 273
 274     if (card_dir)
 275         closedir(card_dir);
 276
 277     if (pcm_dir)
 278         closedir(pcm_dir);
 279
 280     if (status_file)
 281         fclose(status_file);
 282
 283     return busy;
 284 }
 285
 286 static void verify_access(struct userdata *u, struct device *d) {
 287     char *cd;
 288     pa_card *card;
 289     pa_bool_t accessible;
 290
 291     pa_assert(u);
 292     pa_assert(d);
 293
 294     cd = pa_sprintf_malloc("/dev/snd/controlC%s", path_get_card_id(d->path));
 295     accessible = access(cd, R_OK|W_OK) >= 0;
 296     pa_log_debug("%s is accessible: %s", cd, pa_yes_no(accessible));
 297
 298     pa_xfree(cd);
 299
 300     if (d->module == PA_INVALID_INDEX) {
 301
 302         /* If we are not loaded, try to load */
 303
 304         if (accessible) {
 305             pa_module *m;
 306             pa_bool_t busy;
 307
 308             /* Check if any of the PCM devices that belong to this
 309              * card are currently busy. If they are, don't try to load
 310              * right now, to make sure the probing phase can
 311              * successfully complete. When the current user of the
 312              * device closes it we will get another notification via
 313              * inotify and can then recheck. */
 314
 315             busy = is_card_busy(path_get_card_id(d->path));
 316             pa_log_debug("%s is busy: %s", d->path, pa_yes_no(busy));
 317
 318             if (!busy) {
 319
 320                 /* So, why do we rate limit here? It's certainly ugly,
 321                  * but there seems to be no other way. Problem is
 322                  * this: if we are unable to configure/probe an audio
 323                  * device after opening it we will close it again and
 324                  * the module initialization will fail. This will then
 325                  * cause an inotify event on the device node which
 326                  * will be forwarded to us. We then try to reopen the
 327                  * audio device again, practically entering a busy
 328                  * loop.
 329                  *
 330                  * A clean fix would be if we would be able to ignore
 331                  * our own inotify close events. However, inotify
 332                  * lacks such functionality. Also, during probing of
 333                  * the device we cannot really distinguish between
 334                  * other processes causing EBUSY or ourselves, which
 335                  * means we have no way to figure out if the probing
 336                  * during opening was canceled by a "try again"
 337                  * failure or a "fatal" failure. */
 338
 339                 if (pa_ratelimit_test(&d->ratelimit, PA_LOG_DEBUG)) {
 340                     pa_log_debug("Loading module-alsa-card with arguments '%s'", d->args);
 341                     m = pa_module_load(u->core, "module-alsa-card", d->args);
 342
 343                     if (m) {
 344                         d->module = m->index;
 345                         pa_log_info("Card %s (%s) module loaded.", d->path, d->card_name);
 346                     } else
 347                         pa_log_info("Card %s (%s) failed to load module.", d->path, d->card_name);
 348                 } else
 349                     pa_log_warn("Tried to configure %s (%s) more often than %u times in %llus",
 350                                 d->path,
 351                                 d->card_name,
 352                                 d->ratelimit.burst,
 353                                 (long long unsigned) (d->ratelimit.interval / PA_USEC_PER_SEC));
 354             }
 355         }
 356
 357     } else {
 358
 359         /* If we are already loaded update suspend status with
 360          * accessible boolean */
 361
 362         if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD))) {
 363             pa_log_debug("%s all sinks and sources of card %s.", accessible ? "Resuming" : "Suspending", d->card_name);
 364             pa_card_suspend(card, !accessible, PA_SUSPEND_SESSION);
 365         }
 366     }
 367 }
 368
 369 static void card_changed(struct userdata *u, struct udev_device *dev) {
 370     struct device *d;
 371     const char *path;
 372     const char *t;
 373     char *n;
 374     pa_strbuf *args_buf;
 375
 376     pa_assert(u);
 377     pa_assert(dev);
 378
 379     /* Maybe /dev/snd is now available? */
 380     setup_inotify(u);
 381
 382     path = udev_device_get_devpath(dev);
 383
 384     if ((d = pa_hashmap_get(u->devices, path))) {
 385         verify_access(u, d);
 386         return;
 387     }
 388
 389     d = pa_xnew0(struct device, 1);
 390     d->path = pa_xstrdup(path);
 391     d->module = PA_INVALID_INDEX;
 392     PA_INIT_RATELIMIT(d->ratelimit, 10*PA_USEC_PER_SEC, 5);
 393
 394     if (!(t = udev_device_get_property_value(dev, "PULSE_NAME")))
 395         if (!(t = udev_device_get_property_value(dev, "ID_ID")))
 396             if (!(t = udev_device_get_property_value(dev, "ID_PATH")))
 397                 t = path_get_card_id(path);
 398
 399     n = pa_namereg_make_valid_name(t);
 400     d->card_name = pa_sprintf_malloc("alsa_card.%s", n);
 401     args_buf = pa_strbuf_new();
 402     pa_strbuf_printf(args_buf,
 403                      "device_id=\"%s\" "
 404                      "name=\"%s\" "
 405                      "card_name=\"%s\" "
 406                      "namereg_fail=false "
 407                      "tsched=%s "
 408                      "fixed_latency_range=%s "
 409                      "ignore_dB=%s "
 410                      "deferred_volume=%s "
 411                      "use_ucm=%s "
 412                      "card_properties=\"module-udev-detect.discovered=1\"",
 413                      path_get_card_id(path),
 414                      n,
 415                      d->card_name,
 416                      pa_yes_no(u->use_tsched),
 417                      pa_yes_no(u->fixed_latency_range),
 418                      pa_yes_no(u->ignore_dB),
 419                      pa_yes_no(u->deferred_volume),
 420                      pa_yes_no(u->use_ucm));
 421     pa_xfree(n);
 422
 423     if (u->tsched_buffer_size_valid)
 424         pa_strbuf_printf(args_buf, " tsched_buffer_size=%" PRIu32, u->tsched_buffer_size);
 425
 426     d->args = pa_strbuf_tostring_free(args_buf);
 427
 428     pa_hashmap_put(u->devices, d->path, d);
 429
 430     verify_access(u, d);
 431 }
 432
 433 static void remove_card(struct userdata *u, struct udev_device *dev) {
 434     struct device *d;
 435
 436     pa_assert(u);
 437     pa_assert(dev);
 438
 439     if (!(d = pa_hashmap_remove(u->devices, udev_device_get_devpath(dev))))
 440         return;
 441
 442     pa_log_info("Card %s removed.", d->path);
 443
 444     if (d->module != PA_INVALID_INDEX)
 445         pa_module_unload_request_by_index(u->core, d->module, TRUE);
 446
 447     device_free(d);
 448 }
 449
 450 static void process_device(struct userdata *u, struct udev_device *dev) {
 451     const char *action, *ff;
 452
 453     pa_assert(u);
 454     pa_assert(dev);
 455
 456     if (udev_device_get_property_value(dev, "PULSE_IGNORE")) {
 457         pa_log_debug("Ignoring %s, because marked so.", udev_device_get_devpath(dev));
 458         return;
 459     }
 460
 461     if ((ff = udev_device_get_property_value(dev, "SOUND_CLASS")) &&
 462         pa_streq(ff, "modem")) {
 463         pa_log_debug("Ignoring %s, because it is a modem.", udev_device_get_devpath(dev));
 464         return;
 465     }
 466
 467     action = udev_device_get_action(dev);
 468
 469     if (action && pa_streq(action, "remove"))
 470         remove_card(u, dev);
 471     else if ((!action || pa_streq(action, "change")) && udev_device_get_property_value(dev, "SOUND_INITIALIZED"))
 472         card_changed(u, dev);
 473
 474     /* For an explanation why we don't look for 'add' events here
 475      * have a look into /lib/udev/rules.d/78-sound-card.rules! */
 476 }
 477
 478 static void process_path(struct userdata *u, const char *path) {
 479     struct udev_device *dev;
 480
 481     if (!path_get_card_id(path))
 482         return;
 483
 484     if (!(dev = udev_device_new_from_syspath(u->udev, path))) {
 485         pa_log("Failed to get udev device object from udev.");
 486         return;
 487     }
 488
 489     process_device(u, dev);
 490     udev_device_unref(dev);
 491 }
 492
 493 static void monitor_cb(
 494         pa_mainloop_api*a,
 495         pa_io_event* e,
 496         int fd,
 497         pa_io_event_flags_t events,
 498         void *userdata) {
 499
 500     struct userdata *u = userdata;
 501     struct udev_device *dev;
 502
 503     pa_assert(a);
 504
 505     if (!(dev = udev_monitor_receive_device(u->monitor))) {
 506         pa_log("Failed to get udev device object from monitor.");
 507         goto fail;
 508     }
 509
 510     if (!path_get_card_id(udev_device_get_devpath(dev))) {
 511         udev_device_unref(dev);
 512         return;
 513     }
 514
 515     process_device(u, dev);
 516     udev_device_unref(dev);
 517     return;
 518
 519 fail:
 520     a->io_free(u->udev_io);
 521     u->udev_io = NULL;
 522 }
 523
 524 static pa_bool_t pcm_node_belongs_to_device(
 525         struct device *d,
 526         const char *node) {
 527
 528     char *cd;
 529     pa_bool_t b;
 530
 531     cd = pa_sprintf_malloc("pcmC%sD", path_get_card_id(d->path));
 532     b = pa_startswith(node, cd);
 533     pa_xfree(cd);
 534
 535     return b;
 536 }
 537
 538 static pa_bool_t control_node_belongs_to_device(
 539         struct device *d,
 540         const char *node) {
 541
 542     char *cd;
 543     pa_bool_t b;
 544
 545     cd = pa_sprintf_malloc("controlC%s", path_get_card_id(d->path));
 546     b = pa_streq(node, cd);
 547     pa_xfree(cd);
 548
 549     return b;
 550 }
 551
 552 static void inotify_cb(
 553         pa_mainloop_api*a,
 554         pa_io_event* e,
 555         int fd,
 556         pa_io_event_flags_t events,
 557         void *userdata) {
 558
 559     struct {
 560         struct inotify_event e;
 561         char name[NAME_MAX];
 562     } buf;
 563     struct userdata *u = userdata;
 564     static int type = 0;
 565     pa_bool_t deleted = FALSE;
 566     struct device *d;
 567     void *state;
 568
 569     for (;;) {
 570         ssize_t r;
 571         struct inotify_event *event;
 572
 573         pa_zero(buf);
 574         if ((r = pa_read(fd, &buf, sizeof(buf), &type)) <= 0) {
 575
 576             if (r < 0 && errno == EAGAIN)
 577                 break;
 578
 579             pa_log("read() from inotify failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 580             goto fail;
 581         }
 582
 583         event = &buf.e;
 584         while (r > 0) {
 585             size_t len;
 586
 587             if ((size_t) r < sizeof(struct inotify_event)) {
 588                 pa_log("read() too short.");
 589                 goto fail;
 590             }
 591
 592             len = sizeof(struct inotify_event) + event->len;
 593
 594             if ((size_t) r < len) {
 595                 pa_log("Payload missing.");
 596                 goto fail;
 597             }
 598
 599             /* From udev we get the guarantee that the control
 600              * device's ACL is changed last. To avoid races when ACLs
 601              * are changed we hence watch only the control device */
 602             if (((event->mask & IN_ATTRIB) && pa_startswith(event->name, "controlC")))
 603                 PA_HASHMAP_FOREACH(d, u->devices, state)
 604                     if (control_node_belongs_to_device(d, event->name))
 605                         d->need_verify = TRUE;
 606
 607             /* ALSA doesn't really give us any guarantee on the closing
 608              * order, so let's simply hope */
 609             if (((event->mask & IN_CLOSE_WRITE) && pa_startswith(event->name, "pcmC")))
 610                 PA_HASHMAP_FOREACH(d, u->devices, state)
 611                     if (pcm_node_belongs_to_device(d, event->name))
 612                         d->need_verify = TRUE;
 613
 614             /* /dev/snd/ might have been removed */
 615             if ((event->mask & (IN_DELETE_SELF|IN_MOVE_SELF)))
 616                 deleted = TRUE;
 617
 618             event = (struct inotify_event*) ((uint8_t*) event + len);
 619             r -= len;
 620         }
 621     }
 622
 623     PA_HASHMAP_FOREACH(d, u->devices, state)
 624         if (d->need_verify) {
 625             d->need_verify = FALSE;
 626             verify_access(u, d);
 627         }
 628
 629     if (!deleted)
 630         return;
 631
 632 fail:
 633     if (u->inotify_io) {
 634         a->io_free(u->inotify_io);
 635         u->inotify_io = NULL;
 636     }
 637
 638     if (u->inotify_fd >= 0) {
 639         pa_close(u->inotify_fd);
 640         u->inotify_fd = -1;
 641     }
 642 }
 643
 644 static int setup_inotify(struct userdata *u) {
 645     int r;
 646
 647     if (u->inotify_fd >= 0)
 648         return 0;
 649
 650     if ((u->inotify_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
 651         pa_log("inotify_init1() failed: %s", pa_cstrerror(errno));
 652         return -1;
 653     }
 654
 655     r = inotify_add_watch(u->inotify_fd, "/dev/snd", IN_ATTRIB|IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MOVE_SELF);
 656
 657     if (r < 0) {
 658         int saved_errno = errno;
 659
 660         pa_close(u->inotify_fd);
 661         u->inotify_fd = -1;
 662
 663         if (saved_errno == ENOENT) {
 664             pa_log_debug("/dev/snd/ is apparently not existing yet, retrying to create inotify watch later.");
 665             return 0;
 666         }
 667
 668         if (saved_errno == ENOSPC) {
 669             pa_log("You apparently ran out of inotify watches, probably because Tracker/Beagle took them all away. "
 670                    "I wished people would do their homework first and fix inotify before using it for watching whole "
 671                    "directory trees which is something the current inotify is certainly not useful for. "
 672                    "Please make sure to drop the Tracker/Beagle guys a line complaining about their broken use of inotify.");
 673             return 0;
 674         }
 675
 676         pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno));
 677         return -1;
 678     }
 679
 680     pa_assert_se(u->inotify_io = u->core->mainloop->io_new(u->core->mainloop, u->inotify_fd, PA_IO_EVENT_INPUT, inotify_cb, u));
 681
 682     return 0;
 683 }
 684
 685 int pa__init(pa_module *m) {
 686     struct userdata *u = NULL;
 687     pa_modargs *ma;
 688     struct udev_enumerate *enumerate = NULL;
 689     struct udev_list_entry *item = NULL, *first = NULL;
 690     int fd;
 691     pa_bool_t use_tsched = TRUE, fixed_latency_range = FALSE, ignore_dB = FALSE, deferred_volume = m->core->deferred_volume;
 692     bool use_ucm = true;
 693
 694     pa_assert(m);
 695
 696     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 697         pa_log("Failed to parse module arguments");
 698         goto fail;
 699     }
 700
 701     m->userdata = u = pa_xnew0(struct userdata, 1);
 702     u->core = m->core;
 703     u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 704     u->inotify_fd = -1;
 705
 706     if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
 707         pa_log("Failed to parse tsched= argument.");
 708         goto fail;
 709     }
 710     u->use_tsched = use_tsched;
 711
 712     if (pa_modargs_get_value(ma, "tsched_buffer_size", NULL)) {
 713         if (pa_modargs_get_value_u32(ma, "tsched_buffer_size", &u->tsched_buffer_size) < 0) {
 714             pa_log("Failed to parse tsched_buffer_size= argument.");
 715             goto fail;
 716         }
 717
 718         u->tsched_buffer_size_valid = true;
 719     }
 720
 721     if (pa_modargs_get_value_boolean(ma, "fixed_latency_range", &fixed_latency_range) < 0) {
 722         pa_log("Failed to parse fixed_latency_range= argument.");
 723         goto fail;
 724     }
 725     u->fixed_latency_range = fixed_latency_range;
 726
 727     if (pa_modargs_get_value_boolean(ma, "ignore_dB", &ignore_dB) < 0) {
 728         pa_log("Failed to parse ignore_dB= argument.");
 729         goto fail;
 730     }
 731     u->ignore_dB = ignore_dB;
 732
 733     if (pa_modargs_get_value_boolean(ma, "deferred_volume", &deferred_volume) < 0) {
 734         pa_log("Failed to parse deferred_volume= argument.");
 735         goto fail;
 736     }
 737     u->deferred_volume = deferred_volume;
 738
 739     if (pa_modargs_get_value_boolean(ma, "use_ucm", &use_ucm) < 0) {
 740         pa_log("Failed to parse use_ucm= argument.");
 741         goto fail;
 742     }
 743     u->use_ucm = use_ucm;
 744
 745     if (!(u->udev = udev_new())) {
 746         pa_log("Failed to initialize udev library.");
 747         goto fail;
 748     }
 749
 750     if (setup_inotify(u) < 0)
 751         goto fail;
 752
 753     if (!(u->monitor = udev_monitor_new_from_netlink(u->udev, "udev"))) {
 754         pa_log("Failed to initialize monitor.");
 755         goto fail;
 756     }
 757
 758     if (udev_monitor_filter_add_match_subsystem_devtype(u->monitor, "sound", NULL) < 0) {
 759         pa_log("Failed to subscribe to sound devices.");
 760         goto fail;
 761     }
 762
 763     errno = 0;
 764     if (udev_monitor_enable_receiving(u->monitor) < 0) {
 765         pa_log("Failed to enable monitor: %s", pa_cstrerror(errno));
 766         if (errno == EPERM)
 767             pa_log_info("Most likely your kernel is simply too old and "
 768                         "allows only privileged processes to listen to device events. "
 769                         "Please upgrade your kernel to at least 2.6.30.");
 770         goto fail;
 771     }
 772
 773     if ((fd = udev_monitor_get_fd(u->monitor)) < 0) {
 774         pa_log("Failed to get udev monitor fd.");
 775         goto fail;
 776     }
 777
 778     pa_assert_se(u->udev_io = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, monitor_cb, u));
 779
 780     if (!(enumerate = udev_enumerate_new(u->udev))) {
 781         pa_log("Failed to initialize udev enumerator.");
 782         goto fail;
 783     }
 784
 785     if (udev_enumerate_add_match_subsystem(enumerate, "sound") < 0) {
 786         pa_log("Failed to match to subsystem.");
 787         goto fail;
 788     }
 789
 790     if (udev_enumerate_scan_devices(enumerate) < 0) {
 791         pa_log("Failed to scan for devices.");
 792         goto fail;
 793     }
 794
 795     first = udev_enumerate_get_list_entry(enumerate);
 796     udev_list_entry_foreach(item, first)
 797         process_path(u, udev_list_entry_get_name(item));
 798
 799     udev_enumerate_unref(enumerate);
 800
 801     pa_log_info("Found %u cards.", pa_hashmap_size(u->devices));
 802
 803     pa_modargs_free(ma);
 804
 805     return 0;
 806
 807 fail:
 808
 809     if (enumerate)
 810         udev_enumerate_unref(enumerate);
 811
 812     if (ma)
 813         pa_modargs_free(ma);
 814
 815     pa__done(m);
 816
 817     return -1;
 818 }
 819
 820 void pa__done(pa_module *m) {
 821     struct userdata *u;
 822
 823     pa_assert(m);
 824
 825     if (!(u = m->userdata))
 826         return;
 827
 828     if (u->udev_io)
 829         m->core->mainloop->io_free(u->udev_io);
 830
 831     if (u->monitor)
 832         udev_monitor_unref(u->monitor);
 833
 834     if (u->udev)
 835         udev_unref(u->udev);
 836
 837     if (u->inotify_io)
 838         m->core->mainloop->io_free(u->inotify_io);
 839
 840     if (u->inotify_fd >= 0)
 841         pa_close(u->inotify_fd);
 842
 843     if (u->devices)
 844         pa_hashmap_free(u->devices, (pa_free_cb_t) device_free);
 845
 846     pa_xfree(u);
 847 }