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
28 #include <sys/inotify.h>
31 #include <pulsecore/modargs.h>
32 #include <pulsecore/core-error.h>
33 #include <pulsecore/core-util.h>
34 #include <pulsecore/namereg.h>
36 #include "module-udev-detect-symdef.h"
38 PA_MODULE_AUTHOR("Lennart Poettering");
39 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
40 PA_MODULE_VERSION(PACKAGE_VERSION);
41 PA_MODULE_LOAD_ONCE(TRUE);
56 struct udev_monitor *monitor;
60 pa_io_event *inotify_io;
63 static const char* const valid_modargs[] = {
68 static int setup_inotify(struct userdata *u);
70 static void device_free(struct device *d) {
74 pa_xfree(d->card_name);
78 static const char *path_get_card_id(const char *path) {
84 if (!(e = strrchr(path, '/')))
87 if (!pa_startswith(e, "/card"))
93 static void verify_access(struct userdata *u, struct device *d) {
100 if (!(card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD)))
103 cd = pa_sprintf_malloc("%s/snd/controlC%s", udev_get_dev_path(u->udev), path_get_card_id(d->path));
104 d->accessible = access(cd, W_OK) >= 0;
105 pa_log_info("%s is accessible: %s", cd, pa_yes_no(d->accessible));
108 pa_card_suspend(card, !d->accessible, PA_SUSPEND_SESSION);
111 static void card_changed(struct userdata *u, struct udev_device *dev) {
115 char *card_name, *args;
122 /* Maybe /dev/snd is now available? */
125 path = udev_device_get_devpath(dev);
127 if ((d = pa_hashmap_get(u->devices, path))) {
132 if (!(t = udev_device_get_property_value(dev, "PULSE_NAME")))
133 if (!(t = udev_device_get_property_value(dev, "ID_ID")))
134 if (!(t = udev_device_get_property_value(dev, "ID_PATH")))
135 t = path_get_card_id(path);
137 n = pa_namereg_make_valid_name(t);
139 card_name = pa_sprintf_malloc("alsa_card.%s", n);
140 args = pa_sprintf_malloc("device_id=\"%s\" "
144 "card_properties=\"module-udev-detect.discovered=1\"",
145 path_get_card_id(path),
148 (int) u->use_tsched);
150 pa_log_debug("Loading module-alsa-card with arguments '%s'", args);
151 m = pa_module_load(u->core, "module-alsa-card", args);
155 pa_log_info("Card %s (%s) added.", path, n);
157 d = pa_xnew(struct device, 1);
158 d->path = pa_xstrdup(path);
159 d->card_name = card_name;
160 d->module = m->index;
161 d->accessible = TRUE;
163 pa_hashmap_put(u->devices, d->path, d);
170 static void remove_card(struct userdata *u, struct udev_device *dev) {
176 if (!(d = pa_hashmap_remove(u->devices, udev_device_get_devpath(dev))))
179 pa_log_info("Card %s removed.", d->path);
180 pa_module_unload_request_by_index(u->core, d->module, TRUE);
184 static void process_device(struct userdata *u, struct udev_device *dev) {
185 const char *action, *ff;
190 if (udev_device_get_property_value(dev, "PULSE_IGNORE")) {
191 pa_log_debug("Ignoring %s, because marked so.", udev_device_get_devpath(dev));
195 if ((ff = udev_device_get_property_value(dev, "SOUND_FORM_FACTOR")) &&
196 pa_streq(ff, "modem")) {
197 pa_log_debug("Ignoring %s, because it is a modem.", udev_device_get_devpath(dev));
201 action = udev_device_get_action(dev);
203 if (action && pa_streq(action, "remove"))
205 else if ((!action || pa_streq(action, "change")) &&
206 udev_device_get_property_value(dev, "SOUND_INITIALIZED"))
207 card_changed(u, dev);
209 /* For an explanation why we don't look for 'add' events here
210 * have a look into /lib/udev/rules.d/78-sound-card.rules! */
213 static void process_path(struct userdata *u, const char *path) {
214 struct udev_device *dev;
216 if (!path_get_card_id(path))
219 if (!(dev = udev_device_new_from_syspath(u->udev, path))) {
220 pa_log("Failed to get udev device object from udev.");
224 process_device(u, dev);
225 udev_device_unref(dev);
228 static void monitor_cb(
232 pa_io_event_flags_t events,
235 struct userdata *u = userdata;
236 struct udev_device *dev;
240 if (!(dev = udev_monitor_receive_device(u->monitor))) {
241 pa_log("Failed to get udev device object from monitor.");
245 if (!path_get_card_id(udev_device_get_devpath(dev)))
248 process_device(u, dev);
249 udev_device_unref(dev);
253 a->io_free(u->udev_io);
257 static void inotify_cb(
261 pa_io_event_flags_t events,
265 struct inotify_event e;
268 struct userdata *u = userdata;
270 pa_bool_t verify = FALSE, deleted = FALSE;
276 if ((r = pa_read(fd, &buf, sizeof(buf), &type)) <= 0) {
278 if (r < 0 && errno == EAGAIN)
281 pa_log("read() from inotify failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
285 if ((buf.e.mask & IN_CLOSE_WRITE) && pa_startswith(buf.e.name, "pcmC"))
288 if ((buf.e.mask & (IN_DELETE_SELF|IN_MOVE_SELF)))
296 pa_log_debug("Verifying access.");
298 PA_HASHMAP_FOREACH(d, u->devices, state)
307 a->io_free(u->inotify_io);
308 u->inotify_io = NULL;
311 if (u->inotify_fd >= 0) {
312 pa_close(u->inotify_fd);
317 static int setup_inotify(struct userdata *u) {
321 if (u->inotify_fd >= 0)
324 if ((u->inotify_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
325 pa_log("inotify_init1() failed: %s", pa_cstrerror(errno));
329 dev_snd = pa_sprintf_malloc("%s/snd", udev_get_dev_path(u->udev));
330 r = inotify_add_watch(u->inotify_fd, dev_snd, IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MOVE_SELF);
334 int saved_errno = errno;
336 pa_close(u->inotify_fd);
339 if (saved_errno == ENOENT)
342 pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno));
346 pa_assert_se(u->inotify_io = u->core->mainloop->io_new(u->core->mainloop, u->inotify_fd, PA_IO_EVENT_INPUT, inotify_cb, u));
351 int pa__init(pa_module *m) {
352 struct userdata *u = NULL;
354 struct udev_enumerate *enumerate = NULL;
355 struct udev_list_entry *item = NULL, *first = NULL;
360 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
361 pa_log("Failed to parse module arguments");
365 m->userdata = u = pa_xnew0(struct userdata, 1);
367 u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
368 u->use_tsched = TRUE;
371 if (pa_modargs_get_value_boolean(ma, "tsched", &u->use_tsched) < 0) {
372 pa_log("Failed to parse tsched argument.");
376 if (!(u->udev = udev_new())) {
377 pa_log("Failed to initialize udev library.");
381 if (setup_inotify(u) < 0)
384 if (!(u->monitor = udev_monitor_new_from_netlink(u->udev, "udev"))) {
385 pa_log("Failed to initialize monitor.");
390 if (udev_monitor_enable_receiving(u->monitor) < 0) {
391 pa_log("Failed to enable monitor: %s", pa_cstrerror(errno));
393 pa_log_info("Most likely your kernel is simply too old and "
394 "allows only priviliged processes to listen to device events. "
395 "Please upgrade your kernel to at least 2.6.30.");
399 if ((fd = udev_monitor_get_fd(u->monitor)) < 0) {
400 pa_log("Failed to get udev monitor fd.");
404 pa_assert_se(u->udev_io = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, monitor_cb, u));
406 if (!(enumerate = udev_enumerate_new(u->udev))) {
407 pa_log("Failed to initialize udev enumerator.");
411 if (udev_enumerate_add_match_subsystem(enumerate, "sound") < 0) {
412 pa_log("Failed to match to subsystem.");
416 if (udev_enumerate_scan_devices(enumerate) < 0) {
417 pa_log("Failed to scan for devices.");
421 first = udev_enumerate_get_list_entry(enumerate);
422 udev_list_entry_foreach(item, first)
423 process_path(u, udev_list_entry_get_name(item));
425 udev_enumerate_unref(enumerate);
427 pa_log_info("Loaded %u modules.", pa_hashmap_size(u->devices));
436 udev_enumerate_unref(enumerate);
446 void pa__done(pa_module *m) {
451 if (!(u = m->userdata))
455 m->core->mainloop->io_free(u->udev_io);
458 udev_monitor_unref(u->monitor);
464 m->core->mainloop->io_free(u->inotify_io);
466 if (u->inotify_fd >= 0)
467 pa_close(u->inotify_fd);
472 while ((d = pa_hashmap_steal_first(u->devices)))
475 pa_hashmap_free(u->devices, NULL, NULL);