2 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
3 * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #ifdef HAVE_KERNEL_OPTION_HEADERS
32 #include <dev/sound/pcm/sound.h>
33 #include <dev/sound/pcm/pcm.h>
34 #include <dev/sound/version.h>
35 #include <sys/device.h>
37 SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/sndstat.c 248381 2013-03-16 17:57:00Z joel $");
39 #define SS_TYPE_MODULE 0
40 #define SS_TYPE_FIRST 1
42 #define SS_TYPE_MIDI 2
43 #define SS_TYPE_SEQUENCER 3
44 #define SS_TYPE_LAST 3
46 static d_open_t sndstat_open;
47 static d_close_t sndstat_close;
48 static d_read_t sndstat_read;
50 static struct dev_ops sndstat_cdevsw = {
51 { "sndstat", 0, D_MPSAFE },
52 .d_open = sndstat_open,
53 .d_close = sndstat_close,
54 .d_read = sndstat_read,
57 struct sndstat_entry {
58 SLIST_ENTRY(sndstat_entry) link;
61 sndstat_handler handler;
65 static struct lock sndstat_lock;
66 static struct sbuf sndstat_sbuf;
67 static struct cdev *sndstat_dev = NULL;
68 static int sndstat_buflen = 0;
69 static int sndstat_maxunit = -1;
70 static int sndstat_files = 0;
72 #define SNDSTAT_PID(x) ((pid_t)((intptr_t)((x)->si_drv1)))
73 #define SNDSTAT_PID_SET(x, y) (x)->si_drv1 = (void *)((intptr_t)(y))
74 #define SNDSTAT_FLUSH() do { \
75 if (sndstat_buflen != -1) { \
76 sbuf_delete(&sndstat_sbuf); \
77 sndstat_buflen = -1; \
81 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(sndstat_devlist);
84 TUNABLE_INT("hw.snd.verbose", &snd_verbose);
88 sysctl_hw_snd_sndstat_pid(SYSCTL_HANDLER_ARGS)
92 if (sndstat_dev == NULL)
95 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
96 val = (int)SNDSTAT_PID(sndstat_dev);
97 err = sysctl_handle_int(oidp, &val, 0, req);
98 if (err == 0 && req->newptr != NULL && val == 0) {
100 SNDSTAT_PID_SET(sndstat_dev, 0);
102 lockmgr(&sndstat_lock, LK_RELEASE);
105 SYSCTL_PROC(_hw_snd, OID_AUTO, sndstat_pid, CTLTYPE_INT | CTLFLAG_RW,
106 0, sizeof(int), sysctl_hw_snd_sndstat_pid, "I", "sndstat busy pid");
109 static int sndstat_prepare(struct sbuf *s);
112 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
116 verbose = snd_verbose;
117 error = sysctl_handle_int(oidp, &verbose, 0, req);
118 if (error == 0 && req->newptr != NULL) {
119 if (verbose < 0 || verbose > 4)
122 snd_verbose = verbose;
126 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
127 0, sizeof(int), sysctl_hw_sndverbose, "I", "verbosity level");
130 sndstat_open(struct dev_open_args *ap)
132 struct cdev *i_dev = ap->a_head.a_dev;
134 if (sndstat_dev == NULL || i_dev != sndstat_dev)
137 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
138 /* Deal with pulseaudio opening /dev/sndstat twice. */
139 if (SNDSTAT_PID(i_dev) == curproc->p_pid) {
141 } else if (SNDSTAT_PID(i_dev) != 0) {
142 lockmgr(&sndstat_lock, LK_RELEASE);
145 SNDSTAT_PID_SET(i_dev, curproc->p_pid);
146 if (sbuf_new(&sndstat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
147 SNDSTAT_PID_SET(i_dev, 0);
148 lockmgr(&sndstat_lock, LK_RELEASE);
153 lockmgr(&sndstat_lock, LK_RELEASE);
158 sndstat_close(struct dev_close_args *ap)
160 struct cdev *i_dev = ap->a_head.a_dev;
162 if (sndstat_dev == NULL || i_dev != sndstat_dev)
165 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
166 if (SNDSTAT_PID(i_dev) == 0) {
167 lockmgr(&sndstat_lock, LK_RELEASE);
172 SNDSTAT_PID_SET(i_dev, 0);
174 lockmgr(&sndstat_lock, LK_RELEASE);
180 sndstat_read(struct dev_read_args *ap)
182 struct cdev *i_dev = ap->a_head.a_dev;
183 struct uio *buf = ap->a_uio;
186 if (sndstat_dev == NULL || i_dev != sndstat_dev)
189 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
190 if (SNDSTAT_PID(i_dev) != buf->uio_td->td_proc->p_pid ||
191 sndstat_buflen == -1) {
192 lockmgr(&sndstat_lock, LK_RELEASE);
196 if (sndstat_buflen == 0) {
197 err = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
200 lockmgr(&sndstat_lock, LK_RELEASE);
203 sndstat_buflen = sbuf_len(&sndstat_sbuf);
206 l = min(buf->uio_resid, sndstat_buflen - buf->uio_offset);
207 err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + buf->uio_offset, l, buf) : 0;
208 lockmgr(&sndstat_lock, LK_RELEASE);
213 /************************************************************************/
215 static struct sndstat_entry *
216 sndstat_find(int type, int unit)
218 struct sndstat_entry *ent;
220 SLIST_FOREACH(ent, &sndstat_devlist, link) {
221 if (ent->type == type && ent->unit == unit)
229 * The following two functions are called from
230 * pcm_register and pcm_unregister in kernel
231 * which means that td_proc of curthread can be NULL
232 * because this is called from a kernel thread.
233 * We handle this as a separate case for the time
236 * Should the kernel be able to override ownership of sndstat?
240 sndstat_acquire(struct thread *td)
242 if (sndstat_dev == NULL)
245 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
246 if (SNDSTAT_PID(sndstat_dev) != 0) {
247 lockmgr(&sndstat_lock, LK_RELEASE);
250 if (td->td_proc == NULL) {
251 SNDSTAT_PID_SET(sndstat_dev, -1);
253 SNDSTAT_PID_SET(sndstat_dev, td->td_proc->p_pid);
255 lockmgr(&sndstat_lock, LK_RELEASE);
260 sndstat_release(struct thread *td)
262 if (sndstat_dev == NULL)
265 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
266 if (td->td_proc == NULL) {
267 if (SNDSTAT_PID(sndstat_dev) != -1) {
268 lockmgr(&sndstat_lock, LK_RELEASE);
272 if (SNDSTAT_PID(sndstat_dev) != td->td_proc->p_pid) {
273 lockmgr(&sndstat_lock, LK_RELEASE);
277 SNDSTAT_PID_SET(sndstat_dev, 0);
278 lockmgr(&sndstat_lock, LK_RELEASE);
283 sndstat_register(device_t dev, char *str, sndstat_handler handler)
285 struct sndstat_entry *ent;
290 unit = device_get_unit(dev);
291 devtype = device_get_name(dev);
292 if (!strcmp(devtype, "pcm"))
294 else if (!strcmp(devtype, "midi"))
296 else if (!strcmp(devtype, "sequencer"))
297 type = SS_TYPE_SEQUENCER;
301 type = SS_TYPE_MODULE;
305 ent = kmalloc(sizeof *ent, M_DEVBUF, M_WAITOK | M_ZERO);
310 ent->handler = handler;
312 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
313 SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
314 if (type == SS_TYPE_MODULE)
316 sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
317 lockmgr(&sndstat_lock, LK_RELEASE);
323 sndstat_registerfile(char *str)
325 return sndstat_register(NULL, str, NULL);
329 sndstat_unregister(device_t dev)
331 struct sndstat_entry *ent;
333 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
334 SLIST_FOREACH(ent, &sndstat_devlist, link) {
335 if (ent->dev == dev) {
336 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
337 lockmgr(&sndstat_lock, LK_RELEASE);
338 kfree(ent, M_DEVBUF);
343 lockmgr(&sndstat_lock, LK_RELEASE);
349 sndstat_unregisterfile(char *str)
351 struct sndstat_entry *ent;
353 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
354 SLIST_FOREACH(ent, &sndstat_devlist, link) {
355 if (ent->dev == NULL && ent->str == str) {
356 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
358 lockmgr(&sndstat_lock, LK_RELEASE);
359 kfree(ent, M_DEVBUF);
364 lockmgr(&sndstat_lock, LK_RELEASE);
369 /************************************************************************/
372 sndstat_prepare(struct sbuf *s)
374 struct sndstat_entry *ent;
375 struct snddev_info *d;
378 if (snd_verbose > 0) {
379 sbuf_printf(s, "FreeBSD Audio Driver (%ubit %d/%s)\n",
380 (u_int)sizeof(intpcm32_t) << 3, SND_DRV_VERSION,
384 if (SLIST_EMPTY(&sndstat_devlist)) {
385 sbuf_printf(s, "No devices installed.\n");
390 sbuf_printf(s, "Installed devices:\n");
392 for (i = 0; i <= sndstat_maxunit; i++) {
393 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
394 ent = sndstat_find(j, i);
397 d = device_get_softc(ent->dev);
398 if (!PCM_REGISTERED(d))
400 /* XXX Need Giant magic entry ??? */
401 PCM_ACQUIRE_QUICK(d);
402 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
403 sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
405 sbuf_printf(s, " %s", ent->str);
407 ent->handler(s, ent->dev, snd_verbose);
408 sbuf_printf(s, "\n");
409 PCM_RELEASE_QUICK(d);
413 if (snd_verbose >= 3 && sndstat_files > 0) {
414 sbuf_printf(s, "\nFile Versions:\n");
416 SLIST_FOREACH(ent, &sndstat_devlist, link) {
417 if (ent->dev == NULL && ent->str != NULL)
418 sbuf_printf(s, "%s\n", ent->str);
429 if (sndstat_dev != NULL)
431 lockinit(&sndstat_lock, "sndstat lock", 0, LK_CANRECURSE);
432 sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS,
433 UID_ROOT, GID_WHEEL, 0444, "sndstat");
440 if (sndstat_dev == NULL)
443 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
444 if (SNDSTAT_PID(sndstat_dev) != curthread->td_proc->p_pid) {
445 lockmgr(&sndstat_lock, LK_RELEASE);
449 /* XXXPHO: use destroy_dev_sched() */
450 destroy_dev(sndstat_dev);
455 lockmgr(&sndstat_lock, LK_RELEASE);
456 lockuninit(&sndstat_lock);
461 sndstat_sysinit(void *p)
467 sndstat_sysuninit(void *p)
471 error = sndstat_uninit();
472 KASSERT(error == 0, ("%s: error = %d", __func__, error));
475 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
476 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);