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1/*-
2 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
3 * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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.
14 *
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
25 * SUCH DAMAGE.
26 */
27
28#ifdef HAVE_KERNEL_OPTION_HEADERS
29#include "opt_snd.h"
30#endif
31
32#include <dev/sound/pcm/sound.h>
33#include <dev/sound/pcm/pcm.h>
34#include <dev/sound/version.h>
35#include <sys/sx.h>
36
37SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/sndstat.c 193640 2009-06-07 19:12:08Z ariff $");
37SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/sndstat.c 201145 2009-12-28 22:56:30Z antoine $");
38
39#define SS_TYPE_MODULE 0
40#define SS_TYPE_FIRST 1
41#define SS_TYPE_PCM 1
42#define SS_TYPE_MIDI 2
43#define SS_TYPE_SEQUENCER 3
44#define SS_TYPE_LAST 3
45
46static d_open_t sndstat_open;
47static d_close_t sndstat_close;
48static d_read_t sndstat_read;
49
50static struct cdevsw sndstat_cdevsw = {
51 .d_version = D_VERSION,
52 .d_open = sndstat_open,
53 .d_close = sndstat_close,
54 .d_read = sndstat_read,
55 .d_name = "sndstat",
56};
57
58struct sndstat_entry {
59 SLIST_ENTRY(sndstat_entry) link;
60 device_t dev;
61 char *str;
62 sndstat_handler handler;
63 int type, unit;
64};
65
66static struct mtx sndstat_lock;
67static struct sbuf sndstat_sbuf;
68static struct cdev *sndstat_dev = NULL;
69static int sndstat_bufptr = -1;
70static int sndstat_maxunit = -1;
71static int sndstat_files = 0;
72
73#define SNDSTAT_PID(x) ((pid_t)((intptr_t)((x)->si_drv1)))
74#define SNDSTAT_PID_SET(x, y) (x)->si_drv1 = (void *)((intptr_t)(y))
75#define SNDSTAT_FLUSH() do { \
76 if (sndstat_bufptr != -1) { \
77 sbuf_delete(&sndstat_sbuf); \
78 sndstat_bufptr = -1; \
79 } \
80} while (0)
81
82static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
82static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(sndstat_devlist);
83
84int snd_verbose = 1;
85TUNABLE_INT("hw.snd.verbose", &snd_verbose);
86
87#ifdef SND_DEBUG
88static int
89sysctl_hw_snd_sndstat_pid(SYSCTL_HANDLER_ARGS)
90{
91 int err, val;
92
93 if (sndstat_dev == NULL)
94 return (EINVAL);
95
96 mtx_lock(&sndstat_lock);
97 val = (int)SNDSTAT_PID(sndstat_dev);
98 mtx_unlock(&sndstat_lock);
99 err = sysctl_handle_int(oidp, &val, 0, req);
100 if (err == 0 && req->newptr != NULL && val == 0) {
101 mtx_lock(&sndstat_lock);
102 SNDSTAT_FLUSH();
103 SNDSTAT_PID_SET(sndstat_dev, 0);
104 mtx_unlock(&sndstat_lock);
105 }
106 return (err);
107}
108SYSCTL_PROC(_hw_snd, OID_AUTO, sndstat_pid, CTLTYPE_INT | CTLFLAG_RW,
109 0, sizeof(int), sysctl_hw_snd_sndstat_pid, "I", "sndstat busy pid");
110#endif
111
112static int sndstat_prepare(struct sbuf *s);
113
114static int
115sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
116{
117 int error, verbose;
118
119 verbose = snd_verbose;
120 error = sysctl_handle_int(oidp, &verbose, 0, req);
121 if (error == 0 && req->newptr != NULL) {
122 mtx_lock(&sndstat_lock);
123 if (verbose < 0 || verbose > 4)
124 error = EINVAL;
125 else
126 snd_verbose = verbose;
127 mtx_unlock(&sndstat_lock);
128 }
129 return error;
130}
131SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
132 0, sizeof(int), sysctl_hw_sndverbose, "I", "verbosity level");
133
134static int
135sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
136{
137 if (sndstat_dev == NULL || i_dev != sndstat_dev)
138 return EBADF;
139
140 mtx_lock(&sndstat_lock);
141 if (SNDSTAT_PID(i_dev) != 0) {
142 mtx_unlock(&sndstat_lock);
143 return EBUSY;
144 }
145 SNDSTAT_PID_SET(i_dev, td->td_proc->p_pid);
146 mtx_unlock(&sndstat_lock);
147 if (sbuf_new(&sndstat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
148 mtx_lock(&sndstat_lock);
149 SNDSTAT_PID_SET(i_dev, 0);
150 mtx_unlock(&sndstat_lock);
151 return ENXIO;
152 }
153 sndstat_bufptr = 0;
154 return 0;
155}
156
157static int
158sndstat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
159{
160 if (sndstat_dev == NULL || i_dev != sndstat_dev)
161 return EBADF;
162
163 mtx_lock(&sndstat_lock);
164 if (SNDSTAT_PID(i_dev) == 0) {
165 mtx_unlock(&sndstat_lock);
166 return EBADF;
167 }
168
169 SNDSTAT_FLUSH();
170 SNDSTAT_PID_SET(i_dev, 0);
171
172 mtx_unlock(&sndstat_lock);
173
174 return 0;
175}
176
177static int
178sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
179{
180 int l, err;
181
182 if (sndstat_dev == NULL || i_dev != sndstat_dev)
183 return EBADF;
184
185 mtx_lock(&sndstat_lock);
186 if (SNDSTAT_PID(i_dev) != buf->uio_td->td_proc->p_pid ||
187 sndstat_bufptr == -1) {
188 mtx_unlock(&sndstat_lock);
189 return EBADF;
190 }
191 mtx_unlock(&sndstat_lock);
192
193 if (sndstat_bufptr == 0) {
194 err = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
195 if (err) {
196 mtx_lock(&sndstat_lock);
197 SNDSTAT_FLUSH();
198 mtx_unlock(&sndstat_lock);
199 return err;
200 }
201 }
202
203 l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
204 err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
205 sndstat_bufptr += l;
206
207 return err;
208}
209
210/************************************************************************/
211
212static struct sndstat_entry *
213sndstat_find(int type, int unit)
214{
215 struct sndstat_entry *ent;
216
217 SLIST_FOREACH(ent, &sndstat_devlist, link) {
218 if (ent->type == type && ent->unit == unit)
219 return ent;
220 }
221
222 return NULL;
223}
224
225int
226sndstat_acquire(struct thread *td)
227{
228 if (sndstat_dev == NULL)
229 return EBADF;
230
231 mtx_lock(&sndstat_lock);
232 if (SNDSTAT_PID(sndstat_dev) != 0) {
233 mtx_unlock(&sndstat_lock);
234 return EBUSY;
235 }
236 SNDSTAT_PID_SET(sndstat_dev, td->td_proc->p_pid);
237 mtx_unlock(&sndstat_lock);
238 return 0;
239}
240
241int
242sndstat_release(struct thread *td)
243{
244 if (sndstat_dev == NULL)
245 return EBADF;
246
247 mtx_lock(&sndstat_lock);
248 if (SNDSTAT_PID(sndstat_dev) != td->td_proc->p_pid) {
249 mtx_unlock(&sndstat_lock);
250 return EBADF;
251 }
252 SNDSTAT_PID_SET(sndstat_dev, 0);
253 mtx_unlock(&sndstat_lock);
254 return 0;
255}
256
257int
258sndstat_register(device_t dev, char *str, sndstat_handler handler)
259{
260 struct sndstat_entry *ent;
261 const char *devtype;
262 int type, unit;
263
264 if (dev) {
265 unit = device_get_unit(dev);
266 devtype = device_get_name(dev);
267 if (!strcmp(devtype, "pcm"))
268 type = SS_TYPE_PCM;
269 else if (!strcmp(devtype, "midi"))
270 type = SS_TYPE_MIDI;
271 else if (!strcmp(devtype, "sequencer"))
272 type = SS_TYPE_SEQUENCER;
273 else
274 return EINVAL;
275 } else {
276 type = SS_TYPE_MODULE;
277 unit = -1;
278 }
279
280 ent = malloc(sizeof *ent, M_DEVBUF, M_WAITOK | M_ZERO);
281 ent->dev = dev;
282 ent->str = str;
283 ent->type = type;
284 ent->unit = unit;
285 ent->handler = handler;
286
287 mtx_lock(&sndstat_lock);
288 SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
289 if (type == SS_TYPE_MODULE)
290 sndstat_files++;
291 sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
292 mtx_unlock(&sndstat_lock);
293
294 return 0;
295}
296
297int
298sndstat_registerfile(char *str)
299{
300 return sndstat_register(NULL, str, NULL);
301}
302
303int
304sndstat_unregister(device_t dev)
305{
306 struct sndstat_entry *ent;
307
308 mtx_lock(&sndstat_lock);
309 SLIST_FOREACH(ent, &sndstat_devlist, link) {
310 if (ent->dev == dev) {
311 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
312 mtx_unlock(&sndstat_lock);
313 free(ent, M_DEVBUF);
314
315 return 0;
316 }
317 }
318 mtx_unlock(&sndstat_lock);
319
320 return ENXIO;
321}
322
323int
324sndstat_unregisterfile(char *str)
325{
326 struct sndstat_entry *ent;
327
328 mtx_lock(&sndstat_lock);
329 SLIST_FOREACH(ent, &sndstat_devlist, link) {
330 if (ent->dev == NULL && ent->str == str) {
331 SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
332 sndstat_files--;
333 mtx_unlock(&sndstat_lock);
334 free(ent, M_DEVBUF);
335
336 return 0;
337 }
338 }
339 mtx_unlock(&sndstat_lock);
340
341 return ENXIO;
342}
343
344/************************************************************************/
345
346static int
347sndstat_prepare(struct sbuf *s)
348{
349 struct sndstat_entry *ent;
350 struct snddev_info *d;
351 int i, j;
352
353 sbuf_printf(s, "FreeBSD Audio Driver (newpcm: %ubit %d/%s)\n",
354 (u_int)sizeof(intpcm32_t) << 3, SND_DRV_VERSION, MACHINE_ARCH);
355 if (SLIST_EMPTY(&sndstat_devlist)) {
356 sbuf_printf(s, "No devices installed.\n");
357 sbuf_finish(s);
358 return sbuf_len(s);
359 }
360
361 sbuf_printf(s, "Installed devices:\n");
362
363 for (i = 0; i <= sndstat_maxunit; i++) {
364 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
365 ent = sndstat_find(j, i);
366 if (!ent)
367 continue;
368 d = device_get_softc(ent->dev);
369 if (!PCM_REGISTERED(d))
370 continue;
371 /* XXX Need Giant magic entry ??? */
372 PCM_ACQUIRE_QUICK(d);
373 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
374 sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
375 sbuf_printf(s, " %s [%s]", ent->str,
376 (d->flags & SD_F_MPSAFE) ? "MPSAFE" : "GIANT");
377 if (ent->handler)
378 ent->handler(s, ent->dev, snd_verbose);
379 else
380 sbuf_printf(s, " [no handler]");
381 sbuf_printf(s, "\n");
382 PCM_RELEASE_QUICK(d);
383 }
384 }
385
386 if (snd_verbose >= 3 && sndstat_files > 0) {
387 sbuf_printf(s, "\nFile Versions:\n");
388
389 SLIST_FOREACH(ent, &sndstat_devlist, link) {
390 if (ent->dev == NULL && ent->str != NULL)
391 sbuf_printf(s, "%s\n", ent->str);
392 }
393 }
394
395 sbuf_finish(s);
396 return sbuf_len(s);
397}
398
399static int
400sndstat_init(void)
401{
402 if (sndstat_dev != NULL)
403 return EINVAL;
404 mtx_init(&sndstat_lock, "sndstat", "sndstat lock", MTX_DEF);
405 sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS,
406 UID_ROOT, GID_WHEEL, 0444, "sndstat");
407 return 0;
408}
409
410static int
411sndstat_uninit(void)
412{
413 if (sndstat_dev == NULL)
414 return EINVAL;
415
416 mtx_lock(&sndstat_lock);
417 if (SNDSTAT_PID(sndstat_dev) != curthread->td_proc->p_pid) {
418 mtx_unlock(&sndstat_lock);
419 return EBUSY;
420 }
421
422 SNDSTAT_FLUSH();
423
424 mtx_unlock(&sndstat_lock);
425
426 destroy_dev(sndstat_dev);
427 sndstat_dev = NULL;
428
429 mtx_destroy(&sndstat_lock);
430 return 0;
431}
432
433static void
434sndstat_sysinit(void *p)
435{
436 sndstat_init();
437}
438
439static void
440sndstat_sysuninit(void *p)
441{
442 int error;
443
444 error = sndstat_uninit();
445 KASSERT(error == 0, ("%s: error = %d", __func__, error));
446}
447
448SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
449SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);