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
) {
340 pa_log_debug("/dev/snd/ is apparently not existing yet, retrying to create inotify watch later.");
344 if (saved_errno
== ENOSPC
) {
345 pa_log("You apparently ran out of inotify watches, probably because Tracker/Beagle took them all away. "
346 "I wished people would do their homework first and fix inotify before using it for watching whole "
347 "directory trees which is something the current inotify is certainly not useful for. "
348 "Please make sure to drop the Tracker/Beagle guys a line complaining about their broken use of inotify.");
352 pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno
));
356 pa_assert_se(u
->inotify_io
= u
->core
->mainloop
->io_new(u
->core
->mainloop
, u
->inotify_fd
, PA_IO_EVENT_INPUT
, inotify_cb
, u
));
361 int pa__init(pa_module
*m
) {
362 struct userdata
*u
= NULL
;
364 struct udev_enumerate
*enumerate
= NULL
;
365 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
370 if (!(ma
= pa_modargs_new(m
->argument
, valid_modargs
))) {
371 pa_log("Failed to parse module arguments");
375 m
->userdata
= u
= pa_xnew0(struct userdata
, 1);
377 u
->devices
= pa_hashmap_new(pa_idxset_string_hash_func
, pa_idxset_string_compare_func
);
378 u
->use_tsched
= TRUE
;
381 if (pa_modargs_get_value_boolean(ma
, "tsched", &u
->use_tsched
) < 0) {
382 pa_log("Failed to parse tsched argument.");
386 if (!(u
->udev
= udev_new())) {
387 pa_log("Failed to initialize udev library.");
391 if (setup_inotify(u
) < 0)
394 if (!(u
->monitor
= udev_monitor_new_from_netlink(u
->udev
, "udev"))) {
395 pa_log("Failed to initialize monitor.");
400 if (udev_monitor_enable_receiving(u
->monitor
) < 0) {
401 pa_log("Failed to enable monitor: %s", pa_cstrerror(errno
));
403 pa_log_info("Most likely your kernel is simply too old and "
404 "allows only priviliged processes to listen to device events. "
405 "Please upgrade your kernel to at least 2.6.30.");
409 if ((fd
= udev_monitor_get_fd(u
->monitor
)) < 0) {
410 pa_log("Failed to get udev monitor fd.");
414 pa_assert_se(u
->udev_io
= u
->core
->mainloop
->io_new(u
->core
->mainloop
, fd
, PA_IO_EVENT_INPUT
, monitor_cb
, u
));
416 if (!(enumerate
= udev_enumerate_new(u
->udev
))) {
417 pa_log("Failed to initialize udev enumerator.");
421 if (udev_enumerate_add_match_subsystem(enumerate
, "sound") < 0) {
422 pa_log("Failed to match to subsystem.");
426 if (udev_enumerate_scan_devices(enumerate
) < 0) {
427 pa_log("Failed to scan for devices.");
431 first
= udev_enumerate_get_list_entry(enumerate
);
432 udev_list_entry_foreach(item
, first
)
433 process_path(u
, udev_list_entry_get_name(item
));
435 udev_enumerate_unref(enumerate
);
437 pa_log_info("Loaded %u modules.", pa_hashmap_size(u
->devices
));
446 udev_enumerate_unref(enumerate
);
456 void pa__done(pa_module
*m
) {
461 if (!(u
= m
->userdata
))
465 m
->core
->mainloop
->io_free(u
->udev_io
);
468 udev_monitor_unref(u
->monitor
);
474 m
->core
->mainloop
->io_free(u
->inotify_io
);
476 if (u
->inotify_fd
>= 0)
477 pa_close(u
->inotify_fd
);
482 while ((d
= pa_hashmap_steal_first(u
->devices
)))
485 pa_hashmap_free(u
->devices
, NULL
, NULL
);