2 This file is part of PulseAudio.
4 Copyright 2009 Lennart Poettering
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.
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.
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
29 #include <sys/inotify.h>
32 #include <pulsecore/modargs.h>
33 #include <pulsecore/core-error.h>
34 #include <pulsecore/core-util.h>
35 #include <pulsecore/namereg.h>
37 #include "module-udev-detect-symdef.h"
39 PA_MODULE_AUTHOR("Lennart Poettering");
40 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
41 PA_MODULE_VERSION(PACKAGE_VERSION);
42 PA_MODULE_LOAD_ONCE(TRUE);
44 "tsched=<enable system timer based scheduling mode?> "
45 "ignore_dB=<ignore dB information from the device?>");
49 pa_bool_t need_verify;
59 pa_bool_t use_tsched:1;
60 pa_bool_t ignore_dB:1;
63 struct udev_monitor *monitor;
67 pa_io_event *inotify_io;
70 static const char* const valid_modargs[] = {
76 static int setup_inotify(struct userdata *u);
78 static void device_free(struct device *d) {
82 pa_xfree(d->card_name);
87 static const char *path_get_card_id(const char *path) {
93 if (!(e = strrchr(path, '/')))
96 if (!pa_startswith(e, "/card"))
102 static pa_bool_t is_card_busy(const char *id) {
103 char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL;
104 DIR *card_dir = NULL, *pcm_dir = NULL;
105 FILE *status_file = NULL;
107 struct dirent *space = NULL, *de;
108 pa_bool_t busy = FALSE;
113 card_path = pa_sprintf_malloc("/proc/asound/card%s", id);
115 if (!(card_dir = opendir(card_path))) {
116 pa_log_warn("Failed to open %s: %s", card_path, pa_cstrerror(errno));
120 len = offsetof(struct dirent, d_name) + fpathconf(dirfd(card_dir), _PC_NAME_MAX) + 1;
121 space = pa_xmalloc(len);
126 if ((r = readdir_r(card_dir, space, &de)) != 0) {
127 pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
134 if (!pa_startswith(de->d_name, "pcm"))
138 pcm_path = pa_sprintf_malloc("%s/%s", card_path, de->d_name);
143 if (!(pcm_dir = opendir(pcm_path))) {
144 pa_log_warn("Failed to open %s: %s", pcm_path, pa_cstrerror(errno));
151 if ((r = readdir_r(pcm_dir, space, &de)) != 0) {
152 pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
159 if (!pa_startswith(de->d_name, "sub"))
162 pa_xfree(sub_status);
163 sub_status = pa_sprintf_malloc("%s/%s/status", pcm_path, de->d_name);
168 if (!(status_file = fopen(sub_status, "r"))) {
169 pa_log_warn("Failed to open %s: %s", sub_status, pa_cstrerror(errno));
173 if (!(fgets(line, sizeof(line)-1, status_file))) {
174 pa_log_warn("Failed to read from %s: %s", sub_status, pa_cstrerror(errno));
178 if (!pa_streq(line, "closed\n")) {
189 pa_xfree(sub_status);
204 static void verify_access(struct userdata *u, struct device *d) {
207 pa_bool_t accessible;
212 cd = pa_sprintf_malloc("%s/snd/controlC%s", udev_get_dev_path(u->udev), path_get_card_id(d->path));
213 accessible = access(cd, R_OK|W_OK) >= 0;
214 pa_log_debug("%s is accessible: %s", cd, pa_yes_no(accessible));
218 if (d->module == PA_INVALID_INDEX) {
220 /* If we are not loaded, try to load */
226 /* Check if any of the PCM devices that belong to this
227 * card are currently busy. If they are, don't try to load
228 * right now, to make sure the probing phase can
229 * successfully complete. When the current user of the
230 * device closes it we will get another notification via
231 * inotify and can then recheck. */
233 busy = is_card_busy(path_get_card_id(d->path));
234 pa_log_debug("%s is busy: %s", d->path, pa_yes_no(busy));
237 pa_log_debug("Loading module-alsa-card with arguments '%s'", d->args);
238 m = pa_module_load(u->core, "module-alsa-card", d->args);
241 d->module = m->index;
242 pa_log_info("Card %s (%s) module loaded.", d->path, d->card_name);
244 pa_log_info("Card %s (%s) failed to load module.", d->path, d->card_name);
250 /* If we are already loaded update suspend status with
251 * accessible boolean */
253 if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD)))
254 pa_card_suspend(card, !accessible, PA_SUSPEND_SESSION);
258 static void card_changed(struct userdata *u, struct udev_device *dev) {
267 /* Maybe /dev/snd is now available? */
270 path = udev_device_get_devpath(dev);
272 if ((d = pa_hashmap_get(u->devices, path))) {
277 d = pa_xnew0(struct device, 1);
278 d->path = pa_xstrdup(path);
279 d->module = PA_INVALID_INDEX;
281 if (!(t = udev_device_get_property_value(dev, "PULSE_NAME")))
282 if (!(t = udev_device_get_property_value(dev, "ID_ID")))
283 if (!(t = udev_device_get_property_value(dev, "ID_PATH")))
284 t = path_get_card_id(path);
286 n = pa_namereg_make_valid_name(t);
287 d->card_name = pa_sprintf_malloc("alsa_card.%s", n);
288 d->args = pa_sprintf_malloc("device_id=\"%s\" "
293 "card_properties=\"module-udev-detect.discovered=1\"",
294 path_get_card_id(path),
297 pa_yes_no(u->use_tsched),
298 pa_yes_no(u->ignore_dB));
301 pa_hashmap_put(u->devices, d->path, d);
306 static void remove_card(struct userdata *u, struct udev_device *dev) {
312 if (!(d = pa_hashmap_remove(u->devices, udev_device_get_devpath(dev))))
315 pa_log_info("Card %s removed.", d->path);
317 if (d->module != PA_INVALID_INDEX)
318 pa_module_unload_request_by_index(u->core, d->module, TRUE);
323 static void process_device(struct userdata *u, struct udev_device *dev) {
324 const char *action, *ff;
329 if (udev_device_get_property_value(dev, "PULSE_IGNORE")) {
330 pa_log_debug("Ignoring %s, because marked so.", udev_device_get_devpath(dev));
334 if ((ff = udev_device_get_property_value(dev, "SOUND_FORM_FACTOR")) &&
335 pa_streq(ff, "modem")) {
336 pa_log_debug("Ignoring %s, because it is a modem.", udev_device_get_devpath(dev));
340 action = udev_device_get_action(dev);
342 if (action && pa_streq(action, "remove"))
344 else if ((!action || pa_streq(action, "change")) &&
345 udev_device_get_property_value(dev, "SOUND_INITIALIZED"))
346 card_changed(u, dev);
348 /* For an explanation why we don't look for 'add' events here
349 * have a look into /lib/udev/rules.d/78-sound-card.rules! */
352 static void process_path(struct userdata *u, const char *path) {
353 struct udev_device *dev;
355 if (!path_get_card_id(path))
358 if (!(dev = udev_device_new_from_syspath(u->udev, path))) {
359 pa_log("Failed to get udev device object from udev.");
363 process_device(u, dev);
364 udev_device_unref(dev);
367 static void monitor_cb(
371 pa_io_event_flags_t events,
374 struct userdata *u = userdata;
375 struct udev_device *dev;
379 if (!(dev = udev_monitor_receive_device(u->monitor))) {
380 pa_log("Failed to get udev device object from monitor.");
384 if (!path_get_card_id(udev_device_get_devpath(dev)))
387 process_device(u, dev);
388 udev_device_unref(dev);
392 a->io_free(u->udev_io);
396 static pa_bool_t pcm_node_belongs_to_device(
403 cd = pa_sprintf_malloc("pcmC%sD", path_get_card_id(d->path));
404 b = pa_startswith(node, cd);
410 static pa_bool_t control_node_belongs_to_device(
417 cd = pa_sprintf_malloc("controlC%s", path_get_card_id(d->path));
418 b = pa_streq(node, cd);
424 static void inotify_cb(
428 pa_io_event_flags_t events,
432 struct inotify_event e;
435 struct userdata *u = userdata;
437 pa_bool_t deleted = FALSE;
443 struct inotify_event *event;
446 if ((r = pa_read(fd, &buf, sizeof(buf), &type)) <= 0) {
448 if (r < 0 && errno == EAGAIN)
451 pa_log("read() from inotify failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
459 if ((size_t) r < sizeof(struct inotify_event)) {
460 pa_log("read() too short.");
464 len = sizeof(struct inotify_event) + event->len;
466 if ((size_t) r < len) {
467 pa_log("Payload missing.");
471 /* From udev we get the guarantee that the control
472 * device's ACL is changed last. To avoid races when ACLs
473 * are changed we hence watch only the control device */
474 if (((event->mask & IN_ATTRIB) && pa_startswith(event->name, "controlC")))
475 PA_HASHMAP_FOREACH(d, u->devices, state)
476 if (control_node_belongs_to_device(d, event->name))
477 d->need_verify = TRUE;
479 /* ALSA doesn't really give us any guarantee on the closing
480 * order, so let's simply hope */
481 if (((event->mask & IN_CLOSE_WRITE) && pa_startswith(event->name, "pcmC")))
482 PA_HASHMAP_FOREACH(d, u->devices, state)
483 if (pcm_node_belongs_to_device(d, event->name))
484 d->need_verify = TRUE;
486 /* /dev/snd/ might have been removed */
487 if ((event->mask & (IN_DELETE_SELF|IN_MOVE_SELF)))
490 event = (struct inotify_event*) ((uint8_t*) event + len);
495 PA_HASHMAP_FOREACH(d, u->devices, state)
496 if (d->need_verify) {
497 d->need_verify = FALSE;
506 a->io_free(u->inotify_io);
507 u->inotify_io = NULL;
510 if (u->inotify_fd >= 0) {
511 pa_close(u->inotify_fd);
516 static int setup_inotify(struct userdata *u) {
520 if (u->inotify_fd >= 0)
523 if ((u->inotify_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
524 pa_log("inotify_init1() failed: %s", pa_cstrerror(errno));
528 dev_snd = pa_sprintf_malloc("%s/snd", udev_get_dev_path(u->udev));
529 r = inotify_add_watch(u->inotify_fd, dev_snd, IN_ATTRIB|IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MOVE_SELF);
533 int saved_errno = errno;
535 pa_close(u->inotify_fd);
538 if (saved_errno == ENOENT) {
539 pa_log_debug("/dev/snd/ is apparently not existing yet, retrying to create inotify watch later.");
543 if (saved_errno == ENOSPC) {
544 pa_log("You apparently ran out of inotify watches, probably because Tracker/Beagle took them all away. "
545 "I wished people would do their homework first and fix inotify before using it for watching whole "
546 "directory trees which is something the current inotify is certainly not useful for. "
547 "Please make sure to drop the Tracker/Beagle guys a line complaining about their broken use of inotify.");
551 pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno));
555 pa_assert_se(u->inotify_io = u->core->mainloop->io_new(u->core->mainloop, u->inotify_fd, PA_IO_EVENT_INPUT, inotify_cb, u));
560 int pa__init(pa_module *m) {
561 struct userdata *u = NULL;
563 struct udev_enumerate *enumerate = NULL;
564 struct udev_list_entry *item = NULL, *first = NULL;
566 pa_bool_t use_tsched = TRUE, ignore_dB = FALSE;
570 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
571 pa_log("Failed to parse module arguments");
575 m->userdata = u = pa_xnew0(struct userdata, 1);
577 u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
580 if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
581 pa_log("Failed to parse tsched= argument.");
584 u->use_tsched = use_tsched;
586 if (pa_modargs_get_value_boolean(ma, "ignore_dB", &ignore_dB) < 0) {
587 pa_log("Failed to parse ignore_dB= argument.");
590 u->ignore_dB = ignore_dB;
592 if (!(u->udev = udev_new())) {
593 pa_log("Failed to initialize udev library.");
597 if (setup_inotify(u) < 0)
600 if (!(u->monitor = udev_monitor_new_from_netlink(u->udev, "udev"))) {
601 pa_log("Failed to initialize monitor.");
606 if (udev_monitor_enable_receiving(u->monitor) < 0) {
607 pa_log("Failed to enable monitor: %s", pa_cstrerror(errno));
609 pa_log_info("Most likely your kernel is simply too old and "
610 "allows only priviliged processes to listen to device events. "
611 "Please upgrade your kernel to at least 2.6.30.");
615 if ((fd = udev_monitor_get_fd(u->monitor)) < 0) {
616 pa_log("Failed to get udev monitor fd.");
620 pa_assert_se(u->udev_io = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, monitor_cb, u));
622 if (!(enumerate = udev_enumerate_new(u->udev))) {
623 pa_log("Failed to initialize udev enumerator.");
627 if (udev_enumerate_add_match_subsystem(enumerate, "sound") < 0) {
628 pa_log("Failed to match to subsystem.");
632 if (udev_enumerate_scan_devices(enumerate) < 0) {
633 pa_log("Failed to scan for devices.");
637 first = udev_enumerate_get_list_entry(enumerate);
638 udev_list_entry_foreach(item, first)
639 process_path(u, udev_list_entry_get_name(item));
641 udev_enumerate_unref(enumerate);
643 pa_log_info("Found %u cards.", pa_hashmap_size(u->devices));
652 udev_enumerate_unref(enumerate);
662 void pa__done(pa_module *m) {
667 if (!(u = m->userdata))
671 m->core->mainloop->io_free(u->udev_io);
674 udev_monitor_unref(u->monitor);
680 m->core->mainloop->io_free(u->inotify_io);
682 if (u->inotify_fd >= 0)
683 pa_close(u->inotify_fd);
688 while ((d = pa_hashmap_steal_first(u->devices)))
691 pa_hashmap_free(u->devices, NULL, NULL);