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