1 /*-
2 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
3 * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
4 * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifdef HAVE_KERNEL_OPTION_HEADERS
30 #include "opt_snd.h"
31 #endif
32
33 #include <dev/sound/pcm/sound.h>
34
35 #include "feeder_if.h"
36 #include "mixer_if.h"
37
38 SND_DECLARE_FILE("$FreeBSD$");
39
40 MALLOC_DEFINE(M_MIXER, "mixer", "mixer");
41
42 static int mixer_bypass = 1;
43 TUNABLE_INT("hw.snd.vpc_mixer_bypass", &mixer_bypass);
44 SYSCTL_INT(_hw_snd, OID_AUTO, vpc_mixer_bypass, CTLFLAG_RW,
45 &mixer_bypass, 0,
46 "control channel pcm/rec volume, bypassing real mixer device");
47
48 #define MIXER_NAMELEN 16
49 struct snd_mixer {
50 KOBJ_FIELDS;
51 void *devinfo;
52 int busy;
53 int hwvol_muted;
54 int hwvol_mixer;
55 int hwvol_step;
56 int type;
57 device_t dev;
58 u_int32_t hwvol_mute_level;
59 u_int32_t devs;
60 u_int32_t recdevs;
61 u_int32_t recsrc;
62 u_int16_t level[32];
63 u_int8_t parent[32];
64 u_int32_t child[32];
65 u_int8_t realdev[32];
66 char name[MIXER_NAMELEN];
67 struct mtx *lock;
68 oss_mixer_enuminfo enuminfo;
69 /**
70 * Counter is incremented when applications change any of this
71 * mixer's controls. A change in value indicates that persistent
72 * mixer applications should update their displays.
73 */
74 int modify_counter;
75 };
76
77 static u_int16_t snd_mixerdefaults[SOUND_MIXER_NRDEVICES] = {
78 [SOUND_MIXER_VOLUME] = 75,
79 [SOUND_MIXER_BASS] = 50,
80 [SOUND_MIXER_TREBLE] = 50,
81 [SOUND_MIXER_SYNTH] = 75,
82 [SOUND_MIXER_PCM] = 75,
83 [SOUND_MIXER_SPEAKER] = 75,
84 [SOUND_MIXER_LINE] = 75,
85 [SOUND_MIXER_MIC] = 0,
86 [SOUND_MIXER_CD] = 75,
87 [SOUND_MIXER_IGAIN] = 0,
88 [SOUND_MIXER_LINE1] = 75,
89 [SOUND_MIXER_VIDEO] = 75,
90 [SOUND_MIXER_RECLEV] = 75,
91 [SOUND_MIXER_OGAIN] = 50,
92 [SOUND_MIXER_MONITOR] = 75,
93 };
94
95 static char* snd_mixernames[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
96
97 static d_open_t mixer_open;
98 static d_close_t mixer_close;
99 static d_ioctl_t mixer_ioctl;
100
101 static struct cdevsw mixer_cdevsw = {
102 .d_version = D_VERSION,
103 .d_open = mixer_open,
104 .d_close = mixer_close,
105 .d_ioctl = mixer_ioctl,
106 .d_name = "mixer",
107 };
108
109 /**
110 * Keeps a count of mixer devices; used only by OSSv4 SNDCTL_SYSINFO ioctl.
111 */
112 int mixer_count = 0;
113
114 static eventhandler_tag mixer_ehtag = NULL;
115
116 static struct cdev *
117 mixer_get_devt(device_t dev)
118 {
119 struct snddev_info *snddev;
120
121 snddev = device_get_softc(dev);
122
123 return snddev->mixer_dev;
124 }
125
126 static int
127 mixer_lookup(char *devname)
128 {
129 int i;
130
131 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
132 if (strncmp(devname, snd_mixernames[i],
133 strlen(snd_mixernames[i])) == 0)
134 return i;
135 return -1;
136 }
137
138 #define MIXER_SET_UNLOCK(x, y) do { \
139 if ((y) != 0) \
140 snd_mtxunlock((x)->lock); \
141 } while (0)
142
143 #define MIXER_SET_LOCK(x, y) do { \
144 if ((y) != 0) \
145 snd_mtxlock((x)->lock); \
146 } while (0)
147
148 static int
149 mixer_set_softpcmvol(struct snd_mixer *m, struct snddev_info *d,
150 u_int left, u_int right)
151 {
152 struct pcm_channel *c;
153 int dropmtx, acquiremtx;
154
155 if (!PCM_REGISTERED(d))
156 return (EINVAL);
157
158 if (mtx_owned(m->lock))
159 dropmtx = 1;
160 else
161 dropmtx = 0;
162
163 if (!(d->flags & SD_F_MPSAFE) || mtx_owned(d->lock) != 0)
164 acquiremtx = 0;
165 else
166 acquiremtx = 1;
167
168 /*
169 * Be careful here. If we're coming from cdev ioctl, it is OK to
170 * not doing locking AT ALL (except on individual channel) since
171 * we've been heavily guarded by pcm cv, or if we're still
172 * under Giant influence. Since we also have mix_* calls, we cannot
173 * assume such protection and just do the lock as usuall.
174 */
175 MIXER_SET_UNLOCK(m, dropmtx);
176 MIXER_SET_LOCK(d, acquiremtx);
177
178 CHN_FOREACH(c, d, channels.pcm.busy) {
179 CHN_LOCK(c);
180 if (c->direction == PCMDIR_PLAY &&
181 (c->feederflags & (1 << FEEDER_VOLUME)))
182 chn_setvolume_multi(c, SND_VOL_C_MASTER, left, right,
183 (left + right) >> 1);
184 CHN_UNLOCK(c);
185 }
186
187 MIXER_SET_UNLOCK(d, acquiremtx);
188 MIXER_SET_LOCK(m, dropmtx);
189
190 return (0);
191 }
192
193 static int
194 mixer_set_eq(struct snd_mixer *m, struct snddev_info *d,
195 u_int dev, u_int level)
196 {
197 struct pcm_channel *c;
198 struct pcm_feeder *f;
199 int tone, dropmtx, acquiremtx;
200
201 if (dev == SOUND_MIXER_TREBLE)
202 tone = FEEDEQ_TREBLE;
203 else if (dev == SOUND_MIXER_BASS)
204 tone = FEEDEQ_BASS;
205 else
206 return (EINVAL);
207
208 if (!PCM_REGISTERED(d))
209 return (EINVAL);
210
211 if (mtx_owned(m->lock))
212 dropmtx = 1;
213 else
214 dropmtx = 0;
215
216 if (!(d->flags & SD_F_MPSAFE) || mtx_owned(d->lock) != 0)
217 acquiremtx = 0;
218 else
219 acquiremtx = 1;
220
221 /*
222 * Be careful here. If we're coming from cdev ioctl, it is OK to
223 * not doing locking AT ALL (except on individual channel) since
224 * we've been heavily guarded by pcm cv, or if we're still
225 * under Giant influence. Since we also have mix_* calls, we cannot
226 * assume such protection and just do the lock as usuall.
227 */
228 MIXER_SET_UNLOCK(m, dropmtx);
229 MIXER_SET_LOCK(d, acquiremtx);
230
231 CHN_FOREACH(c, d, channels.pcm.busy) {
232 CHN_LOCK(c);
233 f = chn_findfeeder(c, FEEDER_EQ);
234 if (f != NULL)
235 (void)FEEDER_SET(f, tone, level);
236 CHN_UNLOCK(c);
237 }
238
239 MIXER_SET_UNLOCK(d, acquiremtx);
240 MIXER_SET_LOCK(m, dropmtx);
241
242 return (0);
243 }
244
245 static int
246 mixer_set(struct snd_mixer *m, u_int dev, u_int lev)
247 {
248 struct snddev_info *d;
249 u_int l, r, tl, tr;
250 u_int32_t parent = SOUND_MIXER_NONE, child = 0;
251 u_int32_t realdev;
252 int i, dropmtx;
253
254 if (m == NULL || dev >= SOUND_MIXER_NRDEVICES ||
255 (0 == (m->devs & (1 << dev))))
256 return -1;
257
258 l = min((lev & 0x00ff), 100);
259 r = min(((lev & 0xff00) >> 8), 100);
260 realdev = m->realdev[dev];
261
262 d = device_get_softc(m->dev);
263 if (d == NULL)
264 return -1;
265
266 /* It is safe to drop this mutex due to Giant. */
267 if (!(d->flags & SD_F_MPSAFE) && mtx_owned(m->lock) != 0)
268 dropmtx = 1;
269 else
270 dropmtx = 0;
271
272 MIXER_SET_UNLOCK(m, dropmtx);
273
274 /* TODO: recursive handling */
275 parent = m->parent[dev];
276 if (parent >= SOUND_MIXER_NRDEVICES)
277 parent = SOUND_MIXER_NONE;
278 if (parent == SOUND_MIXER_NONE)
279 child = m->child[dev];
280
281 if (parent != SOUND_MIXER_NONE) {
282 tl = (l * (m->level[parent] & 0x00ff)) / 100;
283 tr = (r * ((m->level[parent] & 0xff00) >> 8)) / 100;
284 if (dev == SOUND_MIXER_PCM && (d->flags & SD_F_SOFTPCMVOL))
285 (void)mixer_set_softpcmvol(m, d, tl, tr);
286 else if (realdev != SOUND_MIXER_NONE &&
287 MIXER_SET(m, realdev, tl, tr) < 0) {
288 MIXER_SET_LOCK(m, dropmtx);
289 return -1;
290 }
291 } else if (child != 0) {
292 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
293 if (!(child & (1 << i)) || m->parent[i] != dev)
294 continue;
295 realdev = m->realdev[i];
296 tl = (l * (m->level[i] & 0x00ff)) / 100;
297 tr = (r * ((m->level[i] & 0xff00) >> 8)) / 100;
298 if (i == SOUND_MIXER_PCM &&
299 (d->flags & SD_F_SOFTPCMVOL))
300 (void)mixer_set_softpcmvol(m, d, tl, tr);
301 else if (realdev != SOUND_MIXER_NONE)
302 MIXER_SET(m, realdev, tl, tr);
303 }
304 realdev = m->realdev[dev];
305 if (realdev != SOUND_MIXER_NONE &&
306 MIXER_SET(m, realdev, l, r) < 0) {
307 MIXER_SET_LOCK(m, dropmtx);
308 return -1;
309 }
310 } else {
311 if (dev == SOUND_MIXER_PCM && (d->flags & SD_F_SOFTPCMVOL))
312 (void)mixer_set_softpcmvol(m, d, l, r);
313 else if ((dev == SOUND_MIXER_TREBLE ||
314 dev == SOUND_MIXER_BASS) && (d->flags & SD_F_EQ))
315 (void)mixer_set_eq(m, d, dev, (l + r) >> 1);
316 else if (realdev != SOUND_MIXER_NONE &&
317 MIXER_SET(m, realdev, l, r) < 0) {
318 MIXER_SET_LOCK(m, dropmtx);
319 return -1;
320 }
321 }
322
323 MIXER_SET_LOCK(m, dropmtx);
324
325 m->level[dev] = l | (r << 8);
326
327 return 0;
328 }
329
330 static int
331 mixer_get(struct snd_mixer *mixer, int dev)
332 {
333 if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev)))
334 return mixer->level[dev];
335 else
336 return -1;
337 }
338
339 static int
340 mixer_setrecsrc(struct snd_mixer *mixer, u_int32_t src)
341 {
342 struct snddev_info *d;
343 u_int32_t recsrc;
344 int dropmtx;
345
346 d = device_get_softc(mixer->dev);
347 if (d == NULL)
348 return -1;
349 if (!(d->flags & SD_F_MPSAFE) && mtx_owned(mixer->lock) != 0)
350 dropmtx = 1;
351 else
352 dropmtx = 0;
353 src &= mixer->recdevs;
354 if (src == 0)
355 src = mixer->recdevs & SOUND_MASK_MIC;
356 if (src == 0)
357 src = mixer->recdevs & SOUND_MASK_MONITOR;
358 if (src == 0)
359 src = mixer->recdevs & SOUND_MASK_LINE;
360 if (src == 0 && mixer->recdevs != 0)
361 src = (1 << (ffs(mixer->recdevs) - 1));
362 /* It is safe to drop this mutex due to Giant. */
363 MIXER_SET_UNLOCK(mixer, dropmtx);
364 recsrc = MIXER_SETRECSRC(mixer, src);
365 MIXER_SET_LOCK(mixer, dropmtx);
366
367 mixer->recsrc = recsrc;
368
369 return 0;
370 }
371
372 static int
373 mixer_getrecsrc(struct snd_mixer *mixer)
374 {
375 return mixer->recsrc;
376 }
377
378 /**
379 * @brief Retrieve the route number of the current recording device
380 *
381 * OSSv4 assigns routing numbers to recording devices, unlike the previous
382 * API which relied on a fixed table of device numbers and names. This
383 * function returns the routing number of the device currently selected
384 * for recording.
385 *
386 * For now, this function is kind of a goofy compatibility stub atop the
387 * existing sound system. (For example, in theory, the old sound system
388 * allows multiple recording devices to be specified via a bitmask.)
389 *
390 * @param m mixer context container thing
391 *
392 * @retval 0 success
393 * @retval EIDRM no recording device found (generally not possible)
394 * @todo Ask about error code
395 */
396 static int
397 mixer_get_recroute(struct snd_mixer *m, int *route)
398 {
399 int i, cnt;
400
401 cnt = 0;
402
403 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
404 /** @todo can user set a multi-device mask? (== or &?) */
405 if ((1 << i) == m->recsrc)
406 break;
407 if ((1 << i) & m->recdevs)
408 ++cnt;
409 }
410
411 if (i == SOUND_MIXER_NRDEVICES)
412 return EIDRM;
413
414 *route = cnt;
415 return 0;
416 }
417
418 /**
419 * @brief Select a device for recording
420 *
421 * This function sets a recording source based on a recording device's
422 * routing number. Said number is translated to an old school recdev
423 * mask and passed over mixer_setrecsrc.
424 *
425 * @param m mixer context container thing
426 *
427 * @retval 0 success(?)
428 * @retval EINVAL User specified an invalid device number
429 * @retval otherwise error from mixer_setrecsrc
430 */
431 static int
432 mixer_set_recroute(struct snd_mixer *m, int route)
433 {
434 int i, cnt, ret;
435
436 ret = 0;
437 cnt = 0;
438
439 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
440 if ((1 << i) & m->recdevs) {
441 if (route == cnt)
442 break;
443 ++cnt;
444 }
445 }
446
447 if (i == SOUND_MIXER_NRDEVICES)
448 ret = EINVAL;
449 else
450 ret = mixer_setrecsrc(m, (1 << i));
451
452 return ret;
453 }
454
455 void
456 mix_setdevs(struct snd_mixer *m, u_int32_t v)
457 {
458 struct snddev_info *d;
459 int i;
460
461 if (m == NULL)
462 return;
463
464 d = device_get_softc(m->dev);
465 if (d != NULL && (d->flags & SD_F_SOFTPCMVOL))
466 v |= SOUND_MASK_PCM;
467 if (d != NULL && (d->flags & SD_F_EQ))
468 v |= SOUND_MASK_TREBLE | SOUND_MASK_BASS;
469 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
470 if (m->parent[i] < SOUND_MIXER_NRDEVICES)
471 v |= 1 << m->parent[i];
472 v |= m->child[i];
473 }
474 m->devs = v;
475 }
476
477 /**
478 * @brief Record mask of available recording devices
479 *
480 * Calling functions are responsible for defining the mask of available
481 * recording devices. This function records that value in a structure
482 * used by the rest of the mixer code.
483 *
484 * This function also populates a structure used by the SNDCTL_DSP_*RECSRC*
485 * family of ioctls that are part of OSSV4. All recording device labels
486 * are concatenated in ascending order corresponding to their routing
487 * numbers. (Ex: a system might have 0 => 'vol', 1 => 'cd', 2 => 'line',
488 * etc.) For now, these labels are just the standard recording device
489 * names (cd, line1, etc.), but will eventually be fully dynamic and user
490 * controlled.
491 *
492 * @param m mixer device context container thing
493 * @param v mask of recording devices
494 */
495 void
496 mix_setrecdevs(struct snd_mixer *m, u_int32_t v)
497 {
498 oss_mixer_enuminfo *ei;
499 char *loc;
500 int i, nvalues, nwrote, nleft, ncopied;
501
502 ei = &m->enuminfo;
503
504 nvalues = 0;
505 nwrote = 0;
506 nleft = sizeof(ei->strings);
507 loc = ei->strings;
508
509 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
510 if ((1 << i) & v) {
511 ei->strindex[nvalues] = nwrote;
512 ncopied = strlcpy(loc, snd_mixernames[i], nleft) + 1;
513 /* strlcpy retval doesn't include terminator */
514
515 nwrote += ncopied;
516 nleft -= ncopied;
517 nvalues++;
518
519 /*
520 * XXX I don't think this should ever be possible.
521 * Even with a move to dynamic device/channel names,
522 * each label is limited to ~16 characters, so that'd
523 * take a LOT to fill this buffer.
524 */
525 if ((nleft <= 0) || (nvalues >= OSS_ENUM_MAXVALUE)) {
526 device_printf(m->dev,
527 "mix_setrecdevs: Not enough room to store device names--please file a bug report.\n");
528 device_printf(m->dev,
529 "mix_setrecdevs: Please include details about your sound hardware, OS version, etc.\n");
530 break;
531 }
532
533 loc = &ei->strings[nwrote];
534 }
535 }
536
537 /*
538 * NB: The SNDCTL_DSP_GET_RECSRC_NAMES ioctl ignores the dev
539 * and ctrl fields.
540 */
541 ei->nvalues = nvalues;
542 m->recdevs = v;
543 }
544
545 void
546 mix_setparentchild(struct snd_mixer *m, u_int32_t parent, u_int32_t childs)
547 {
548 u_int32_t mask = 0;
549 int i;
550
551 if (m == NULL || parent >= SOUND_MIXER_NRDEVICES)
552 return;
553 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
554 if (i == parent)
555 continue;
556 if (childs & (1 << i)) {
557 mask |= 1 << i;
558 if (m->parent[i] < SOUND_MIXER_NRDEVICES)
559 m->child[m->parent[i]] &= ~(1 << i);
560 m->parent[i] = parent;
561 m->child[i] = 0;
562 }
563 }
564 mask &= ~(1 << parent);
565 m->child[parent] = mask;
566 }
567
568 void
569 mix_setrealdev(struct snd_mixer *m, u_int32_t dev, u_int32_t realdev)
570 {
571 if (m == NULL || dev >= SOUND_MIXER_NRDEVICES ||
572 !(realdev == SOUND_MIXER_NONE || realdev < SOUND_MIXER_NRDEVICES))
573 return;
574 m->realdev[dev] = realdev;
575 }
576
577 u_int32_t
578 mix_getparent(struct snd_mixer *m, u_int32_t dev)
579 {
580 if (m == NULL || dev >= SOUND_MIXER_NRDEVICES)
581 return SOUND_MIXER_NONE;
582 return m->parent[dev];
583 }
584
585 u_int32_t
586 mix_getchild(struct snd_mixer *m, u_int32_t dev)
587 {
588 if (m == NULL || dev >= SOUND_MIXER_NRDEVICES)
589 return 0;
590 return m->child[dev];
591 }
592
593 u_int32_t
594 mix_getdevs(struct snd_mixer *m)
595 {
596 return m->devs;
597 }
598
599 u_int32_t
600 mix_getrecdevs(struct snd_mixer *m)
601 {
602 return m->recdevs;
603 }
604
605 void *
606 mix_getdevinfo(struct snd_mixer *m)
607 {
608 return m->devinfo;
609 }
610
611 static struct snd_mixer *
612 mixer_obj_create(device_t dev, kobj_class_t cls, void *devinfo,
613 int type, const char *desc)
614 {
615 struct snd_mixer *m;
616 int i;
617
618 KASSERT(dev != NULL && cls != NULL && devinfo != NULL,
619 ("%s(): NULL data dev=%p cls=%p devinfo=%p",
620 __func__, dev, cls, devinfo));
621 KASSERT(type == MIXER_TYPE_PRIMARY || type == MIXER_TYPE_SECONDARY,
622 ("invalid mixer type=%d", type));
623
624 m = (struct snd_mixer *)kobj_create(cls, M_MIXER, M_WAITOK | M_ZERO);
625 snprintf(m->name, sizeof(m->name), "%s:mixer",
626 device_get_nameunit(dev));
627 if (desc != NULL) {
628 strlcat(m->name, ":", sizeof(m->name));
629 strlcat(m->name, desc, sizeof(m->name));
630 }
631 m->lock = snd_mtxcreate(m->name, (type == MIXER_TYPE_PRIMARY) ?
632 "primary pcm mixer" : "secondary pcm mixer");
633 m->type = type;
634 m->devinfo = devinfo;
635 m->busy = 0;
636 m->dev = dev;
637 for (i = 0; i < (sizeof(m->parent) / sizeof(m->parent[0])); i++) {
638 m->parent[i] = SOUND_MIXER_NONE;
639 m->child[i] = 0;
640 m->realdev[i] = i;
641 }
642
643 if (MIXER_INIT(m)) {
644 snd_mtxlock(m->lock);
645 snd_mtxfree(m->lock);
646 kobj_delete((kobj_t)m, M_MIXER);
647 return (NULL);
648 }
649
650 return (m);
651 }
652
653 int
654 mixer_delete(struct snd_mixer *m)
655 {
656 KASSERT(m != NULL, ("NULL snd_mixer"));
657 KASSERT(m->type == MIXER_TYPE_SECONDARY,
658 ("%s(): illegal mixer type=%d", __func__, m->type));
659
660 /* mixer uninit can sleep --hps */
661
662 MIXER_UNINIT(m);
663
664 snd_mtxfree(m->lock);
665 kobj_delete((kobj_t)m, M_MIXER);
666
667 --mixer_count;
668
669 return (0);
670 }
671
672 struct snd_mixer *
673 mixer_create(device_t dev, kobj_class_t cls, void *devinfo, const char *desc)
674 {
675 struct snd_mixer *m;
676
677 m = mixer_obj_create(dev, cls, devinfo, MIXER_TYPE_SECONDARY, desc);
678
679 if (m != NULL)
680 ++mixer_count;
681
682 return (m);
683 }
684
685 int
686 mixer_init(device_t dev, kobj_class_t cls, void *devinfo)
687 {
688 struct snddev_info *snddev;
689 struct snd_mixer *m;
690 u_int16_t v;
691 struct cdev *pdev;
692 int i, unit, devunit, val;
693
694 snddev = device_get_softc(dev);
695 if (snddev == NULL)
696 return (-1);
697
698 if (resource_int_value(device_get_name(dev),
699 device_get_unit(dev), "eq", &val) == 0 && val != 0) {
700 snddev->flags |= SD_F_EQ;
701 if ((val & SD_F_EQ_MASK) == val)
702 snddev->flags |= val;
703 else
704 snddev->flags |= SD_F_EQ_DEFAULT;
705 snddev->eqpreamp = 0;
706 }
707
708 m = mixer_obj_create(dev, cls, devinfo, MIXER_TYPE_PRIMARY, NULL);
709 if (m == NULL)
710 return (-1);
711
712 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
713 v = snd_mixerdefaults[i];
714
715 if (resource_int_value(device_get_name(dev),
716 device_get_unit(dev), snd_mixernames[i], &val) == 0) {
717 if (val >= 0 && val <= 100) {
718 v = (u_int16_t) val;
719 }
720 }
721
722 mixer_set(m, i, v | (v << 8));
723 }
724
725 mixer_setrecsrc(m, 0); /* Set default input. */
726
727 unit = device_get_unit(dev);
728 devunit = snd_mkunit(unit, SND_DEV_CTL, 0);
729 pdev = make_dev(&mixer_cdevsw, PCMMINOR(devunit),
730 UID_ROOT, GID_WHEEL, 0666, "mixer%d", unit);
731 pdev->si_drv1 = m;
732 snddev->mixer_dev = pdev;
733
734 ++mixer_count;
735
736 if (bootverbose) {
737 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
738 if (!(m->devs & (1 << i)))
739 continue;
740 if (m->realdev[i] != i) {
741 device_printf(dev, "Mixer \"%s\" -> \"%s\":",
742 snd_mixernames[i],
743 (m->realdev[i] < SOUND_MIXER_NRDEVICES) ?
744 snd_mixernames[m->realdev[i]] : "none");
745 } else {
746 device_printf(dev, "Mixer \"%s\":",
747 snd_mixernames[i]);
748 }
749 if (m->parent[i] < SOUND_MIXER_NRDEVICES)
750 printf(" parent=\"%s\"",
751 snd_mixernames[m->parent[i]]);
752 if (m->child[i] != 0)
753 printf(" child=0x%08x", m->child[i]);
754 printf("\n");
755 }
756 if (snddev->flags & SD_F_SOFTPCMVOL)
757 device_printf(dev, "Soft PCM mixer ENABLED\n");
758 if (snddev->flags & SD_F_EQ)
759 device_printf(dev, "EQ Treble/Bass ENABLED\n");
760 }
761
762 return (0);
763 }
764
765 int
766 mixer_uninit(device_t dev)
767 {
768 int i;
769 struct snddev_info *d;
770 struct snd_mixer *m;
771 struct cdev *pdev;
772
773 d = device_get_softc(dev);
774 pdev = mixer_get_devt(dev);
775 if (d == NULL || pdev == NULL || pdev->si_drv1 == NULL)
776 return EBADF;
777
778 m = pdev->si_drv1;
779 KASSERT(m != NULL, ("NULL snd_mixer"));
780 KASSERT(m->type == MIXER_TYPE_PRIMARY,
781 ("%s(): illegal mixer type=%d", __func__, m->type));
782
783 snd_mtxlock(m->lock);
784
785 if (m->busy) {
786 snd_mtxunlock(m->lock);
787 return EBUSY;
788 }
789
790 /* destroy dev can sleep --hps */
791
792 snd_mtxunlock(m->lock);
793
794 pdev->si_drv1 = NULL;
795 destroy_dev(pdev);
796
797 snd_mtxlock(m->lock);
798
799 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
800 mixer_set(m, i, 0);
801
802 mixer_setrecsrc(m, SOUND_MASK_MIC);
803
804 snd_mtxunlock(m->lock);
805
806 /* mixer uninit can sleep --hps */
807
808 MIXER_UNINIT(m);
809
810 snd_mtxfree(m->lock);
811 kobj_delete((kobj_t)m, M_MIXER);
812
813 d->mixer_dev = NULL;
814
815 --mixer_count;
816
817 return 0;
818 }
819
820 int
821 mixer_reinit(device_t dev)
822 {
823 struct snd_mixer *m;
824 struct cdev *pdev;
825 int i;
826
827 pdev = mixer_get_devt(dev);
828 m = pdev->si_drv1;
829 snd_mtxlock(m->lock);
830
831 i = MIXER_REINIT(m);
832 if (i) {
833 snd_mtxunlock(m->lock);
834 return i;
835 }
836
837 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
838 mixer_set(m, i, m->level[i]);
839
840 mixer_setrecsrc(m, m->recsrc);
841 snd_mtxunlock(m->lock);
842
843 return 0;
844 }
845
846 static int
847 sysctl_hw_snd_hwvol_mixer(SYSCTL_HANDLER_ARGS)
848 {
849 char devname[32];
850 int error, dev;
851 struct snd_mixer *m;
852
853 m = oidp->oid_arg1;
854 snd_mtxlock(m->lock);
855 strlcpy(devname, snd_mixernames[m->hwvol_mixer], sizeof(devname));
856 snd_mtxunlock(m->lock);
857 error = sysctl_handle_string(oidp, &devname[0], sizeof(devname), req);
858 snd_mtxlock(m->lock);
859 if (error == 0 && req->newptr != NULL) {
860 dev = mixer_lookup(devname);
861 if (dev == -1) {
862 snd_mtxunlock(m->lock);
863 return EINVAL;
864 }
865 else if (dev != m->hwvol_mixer) {
866 m->hwvol_mixer = dev;
867 m->hwvol_muted = 0;
868 }
869 }
870 snd_mtxunlock(m->lock);
871 return error;
872 }
873
874 int
875 mixer_hwvol_init(device_t dev)
876 {
877 struct snd_mixer *m;
878 struct cdev *pdev;
879
880 pdev = mixer_get_devt(dev);
881 m = pdev->si_drv1;
882
883 m->hwvol_mixer = SOUND_MIXER_VOLUME;
884 m->hwvol_step = 5;
885 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
886 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
887 OID_AUTO, "hwvol_step", CTLFLAG_RW, &m->hwvol_step, 0, "");
888 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
889 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
890 OID_AUTO, "hwvol_mixer", CTLTYPE_STRING | CTLFLAG_RW, m, 0,
891 sysctl_hw_snd_hwvol_mixer, "A", "");
892 return 0;
893 }
894
895 void
896 mixer_hwvol_mute_locked(struct snd_mixer *m)
897 {
898 if (m->hwvol_muted) {
899 m->hwvol_muted = 0;
900 mixer_set(m, m->hwvol_mixer, m->hwvol_mute_level);
901 } else {
902 m->hwvol_muted++;
903 m->hwvol_mute_level = mixer_get(m, m->hwvol_mixer);
904 mixer_set(m, m->hwvol_mixer, 0);
905 }
906 }
907
908 void
909 mixer_hwvol_mute(device_t dev)
910 {
911 struct snd_mixer *m;
912 struct cdev *pdev;
913
914 pdev = mixer_get_devt(dev);
915 m = pdev->si_drv1;
916 snd_mtxlock(m->lock);
917 mixer_hwvol_mute_locked(m);
918 snd_mtxunlock(m->lock);
919 }
920
921 void
922 mixer_hwvol_step_locked(struct snd_mixer *m, int left_step, int right_step)
923 {
924 int level, left, right;
925
926 if (m->hwvol_muted) {
927 m->hwvol_muted = 0;
928 level = m->hwvol_mute_level;
929 } else
930 level = mixer_get(m, m->hwvol_mixer);
931 if (level != -1) {
932 left = level & 0xff;
933 right = (level >> 8) & 0xff;
934 left += left_step * m->hwvol_step;
935 if (left < 0)
936 left = 0;
937 else if (left > 100)
938 left = 100;
939 right += right_step * m->hwvol_step;
940 if (right < 0)
941 right = 0;
942 else if (right > 100)
943 right = 100;
944 mixer_set(m, m->hwvol_mixer, left | right << 8);
945 }
946 }
947
948 void
949 mixer_hwvol_step(device_t dev, int left_step, int right_step)
950 {
951 struct snd_mixer *m;
952 struct cdev *pdev;
953
954 pdev = mixer_get_devt(dev);
955 m = pdev->si_drv1;
956 snd_mtxlock(m->lock);
957 mixer_hwvol_step_locked(m, left_step, right_step);
958 snd_mtxunlock(m->lock);
959 }
960
961 int
962 mixer_busy(struct snd_mixer *m)
963 {
964 KASSERT(m != NULL, ("NULL snd_mixer"));
965
966 return (m->busy);
967 }
968
969 int
970 mix_set(struct snd_mixer *m, u_int dev, u_int left, u_int right)
971 {
972 int ret;
973
974 KASSERT(m != NULL, ("NULL snd_mixer"));
975
976 snd_mtxlock(m->lock);
977 ret = mixer_set(m, dev, left | (right << 8));
978 snd_mtxunlock(m->lock);
979
980 return ((ret != 0) ? ENXIO : 0);
981 }
982
983 int
984 mix_get(struct snd_mixer *m, u_int dev)
985 {
986 int ret;
987
988 KASSERT(m != NULL, ("NULL snd_mixer"));
989
990 snd_mtxlock(m->lock);
991 ret = mixer_get(m, dev);
992 snd_mtxunlock(m->lock);
993
994 return (ret);
995 }
996
997 int
998 mix_setrecsrc(struct snd_mixer *m, u_int32_t src)
999 {
1000 int ret;
1001
1002 KASSERT(m != NULL, ("NULL snd_mixer"));
1003
1004 snd_mtxlock(m->lock);
1005 ret = mixer_setrecsrc(m, src);
1006 snd_mtxunlock(m->lock);
1007
1008 return ((ret != 0) ? ENXIO : 0);
1009 }
1010
1011 u_int32_t
1012 mix_getrecsrc(struct snd_mixer *m)
1013 {
1014 u_int32_t ret;
1015
1016 KASSERT(m != NULL, ("NULL snd_mixer"));
1017
1018 snd_mtxlock(m->lock);
1019 ret = mixer_getrecsrc(m);
1020 snd_mtxunlock(m->lock);
1021
1022 return (ret);
1023 }
1024
1025 int
1026 mix_get_type(struct snd_mixer *m)
1027 {
1028 KASSERT(m != NULL, ("NULL snd_mixer"));
1029
1030 return (m->type);
1031 }
1032
1033 /* ----------------------------------------------------------------------- */
1034
1035 static int
1036 mixer_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
1037 {
1038 struct snddev_info *d;
1039 struct snd_mixer *m;
1040
1041
1042 if (i_dev == NULL || i_dev->si_drv1 == NULL)
1043 return (EBADF);
1044
1045 m = i_dev->si_drv1;
1046 d = device_get_softc(m->dev);
1047 if (!PCM_REGISTERED(d))
1048 return (EBADF);
1049
1050 /* XXX Need Giant magic entry ??? */
1051
1052 snd_mtxlock(m->lock);
1053 m->busy = 1;
1054 snd_mtxunlock(m->lock);
1055
1056 return (0);
1057 }
1058
1059 static int
1060 mixer_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
1061 {
1062 struct snddev_info *d;
1063 struct snd_mixer *m;
1064 int ret;
1065
1066 if (i_dev == NULL || i_dev->si_drv1 == NULL)
1067 return (EBADF);
1068
1069 m = i_dev->si_drv1;
1070 d = device_get_softc(m->dev);
1071 if (!PCM_REGISTERED(d))
1072 return (EBADF);
1073
1074 /* XXX Need Giant magic entry ??? */
1075
1076 snd_mtxlock(m->lock);
1077 ret = (m->busy == 0) ? EBADF : 0;
1078 m->busy = 0;
1079 snd_mtxunlock(m->lock);
1080
1081 return (ret);
1082 }
1083
1084 static int
1085 mixer_ioctl_channel(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
1086 struct thread *td, int from)
1087 {
1088 struct snddev_info *d;
1089 struct snd_mixer *m;
1090 struct pcm_channel *c, *rdch, *wrch;
1091 pid_t pid;
1092 int j, ret;
1093
1094 if (td == NULL || td->td_proc == NULL)
1095 return (-1);
1096
1097 m = dev->si_drv1;
1098 d = device_get_softc(m->dev);
1099 j = cmd & 0xff;
1100
1101 switch (j) {
1102 case SOUND_MIXER_PCM:
1103 case SOUND_MIXER_RECLEV:
1104 case SOUND_MIXER_DEVMASK:
1105 case SOUND_MIXER_CAPS:
1106 case SOUND_MIXER_STEREODEVS:
1107 break;
1108 default:
1109 return (-1);
1110 break;
1111 }
1112
1113 pid = td->td_proc->p_pid;
1114 rdch = NULL;
1115 wrch = NULL;
1116 c = NULL;
1117 ret = -1;
1118
1119 /*
1120 * This is unfair. Imagine single proc opening multiple
1121 * instances of same direction. What we do right now
1122 * is looking for the first matching proc/pid, and just
1123 * that. Nothing more. Consider it done.
1124 *
1125 * The better approach of controlling specific channel
1126 * pcm or rec volume is by doing mixer ioctl
1127 * (SNDCTL_DSP_[SET|GET][PLAY|REC]VOL / SOUND_MIXER_[PCM|RECLEV]
1128 * on its open fd, rather than cracky mixer bypassing here.
1129 */
1130 CHN_FOREACH(c, d, channels.pcm.opened) {
1131 CHN_LOCK(c);
1132 if (c->pid != pid ||
1133 !(c->feederflags & (1 << FEEDER_VOLUME))) {
1134 CHN_UNLOCK(c);
1135 continue;
1136 }
1137 if (rdch == NULL && c->direction == PCMDIR_REC) {
1138 rdch = c;
1139 if (j == SOUND_MIXER_RECLEV)
1140 goto mixer_ioctl_channel_proc;
1141 } else if (wrch == NULL && c->direction == PCMDIR_PLAY) {
1142 wrch = c;
1143 if (j == SOUND_MIXER_PCM)
1144 goto mixer_ioctl_channel_proc;
1145 }
1146 CHN_UNLOCK(c);
1147 if (rdch != NULL && wrch != NULL)
1148 break;
1149 }
1150
1151 if (rdch == NULL && wrch == NULL)
1152 return (-1);
1153
1154 if ((j == SOUND_MIXER_DEVMASK || j == SOUND_MIXER_CAPS ||
1155 j == SOUND_MIXER_STEREODEVS) &&
1156 (cmd & ~0xff) == MIXER_READ(0)) {
1157 snd_mtxlock(m->lock);
1158 *(int *)arg = mix_getdevs(m);
1159 snd_mtxunlock(m->lock);
1160 if (rdch != NULL)
1161 *(int *)arg |= SOUND_MASK_RECLEV;
1162 if (wrch != NULL)
1163 *(int *)arg |= SOUND_MASK_PCM;
1164 ret = 0;
1165 }
1166
1167 return (ret);
1168
1169 mixer_ioctl_channel_proc:
1170
1171 KASSERT(c != NULL, ("%s(): NULL channel", __func__));
1172 CHN_LOCKASSERT(c);
1173
1174 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1175 int left, right, center;
1176
1177 left = *(int *)arg & 0x7f;
1178 right = (*(int *)arg >> 8) & 0x7f;
1179 center = (left + right) >> 1;
1180 chn_setvolume_multi(c, SND_VOL_C_PCM, left, right, center);
1181 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1182 *(int *)arg = CHN_GETVOLUME(c, SND_VOL_C_PCM, SND_CHN_T_FL);
1183 *(int *)arg |=
1184 CHN_GETVOLUME(c, SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1185 }
1186
1187 CHN_UNLOCK(c);
1188
1189 return (0);
1190 }
1191
1192 static int
1193 mixer_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1194 struct thread *td)
1195 {
1196 struct snddev_info *d;
1197 int ret;
1198
1199 if (i_dev == NULL || i_dev->si_drv1 == NULL)
1200 return (EBADF);
1201
1202 d = device_get_softc(((struct snd_mixer *)i_dev->si_drv1)->dev);
1203 if (!PCM_REGISTERED(d))
1204 return (EBADF);
1205
1206 PCM_GIANT_ENTER(d);
1207 PCM_ACQUIRE_QUICK(d);
1208
1209 ret = -1;
1210
1211 if (mixer_bypass != 0 && (d->flags & SD_F_VPC))
1212 ret = mixer_ioctl_channel(i_dev, cmd, arg, mode, td,
1213 MIXER_CMD_CDEV);
1214
1215 if (ret == -1)
1216 ret = mixer_ioctl_cmd(i_dev, cmd, arg, mode, td,
1217 MIXER_CMD_CDEV);
1218
1219 PCM_RELEASE_QUICK(d);
1220 PCM_GIANT_LEAVE(d);
1221
1222 return (ret);
1223 }
1224
1225 static void
1226 mixer_mixerinfo(struct snd_mixer *m, mixer_info *mi)
1227 {
1228 bzero((void *)mi, sizeof(*mi));
1229 strlcpy(mi->id, m->name, sizeof(mi->id));
1230 strlcpy(mi->name, device_get_desc(m->dev), sizeof(mi->name));
1231 mi->modify_counter = m->modify_counter;
1232 }
1233
1234 /*
1235 * XXX Make sure you can guarantee concurrency safety before calling this
1236 * function, be it through Giant, PCM_*, etc !
1237 */
1238 int
1239 mixer_ioctl_cmd(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1240 struct thread *td, int from)
1241 {
1242 struct snd_mixer *m;
1243 int ret = EINVAL, *arg_i = (int *)arg;
1244 int v = -1, j = cmd & 0xff;
1245
1246 /*
1247 * Certain ioctls may be made on any type of device (audio, mixer,
1248 * and MIDI). Handle those special cases here.
1249 */
1250 if (IOCGROUP(cmd) == 'X') {
1251 switch (cmd) {
1252 case SNDCTL_SYSINFO:
1253 sound_oss_sysinfo((oss_sysinfo *)arg);
1254 return (0);
1255 case SNDCTL_CARDINFO:
1256 return (sound_oss_card_info((oss_card_info *)arg));
1257 case SNDCTL_AUDIOINFO:
1258 case SNDCTL_AUDIOINFO_EX:
1259 case SNDCTL_ENGINEINFO:
1260 return (dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg));
1261 case SNDCTL_MIXERINFO:
1262 return (mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg));
1263 }
1264 return (EINVAL);
1265 }
1266
1267 m = i_dev->si_drv1;
1268
1269 if (m == NULL)
1270 return (EBADF);
1271
1272 snd_mtxlock(m->lock);
1273 if (from == MIXER_CMD_CDEV && !m->busy) {
1274 snd_mtxunlock(m->lock);
1275 return (EBADF);
1276 }
1277 switch (cmd) {
1278 case SNDCTL_DSP_GET_RECSRC_NAMES:
1279 bcopy((void *)&m->enuminfo, arg, sizeof(oss_mixer_enuminfo));
1280 ret = 0;
1281 goto done;
1282 case SNDCTL_DSP_GET_RECSRC:
1283 ret = mixer_get_recroute(m, arg_i);
1284 goto done;
1285 case SNDCTL_DSP_SET_RECSRC:
1286 ret = mixer_set_recroute(m, *arg_i);
1287 goto done;
1288 case OSS_GETVERSION:
1289 *arg_i = SOUND_VERSION;
1290 ret = 0;
1291 goto done;
1292 case SOUND_MIXER_INFO:
1293 mixer_mixerinfo(m, (mixer_info *)arg);
1294 ret = 0;
1295 goto done;
1296 }
1297 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1298 if (j == SOUND_MIXER_RECSRC)
1299 ret = mixer_setrecsrc(m, *arg_i);
1300 else
1301 ret = mixer_set(m, j, *arg_i);
1302 snd_mtxunlock(m->lock);
1303 return ((ret == 0) ? 0 : ENXIO);
1304 }
1305 if ((cmd & ~0xff) == MIXER_READ(0)) {
1306 switch (j) {
1307 case SOUND_MIXER_DEVMASK:
1308 case SOUND_MIXER_CAPS:
1309 case SOUND_MIXER_STEREODEVS:
1310 v = mix_getdevs(m);
1311 break;
1312 case SOUND_MIXER_RECMASK:
1313 v = mix_getrecdevs(m);
1314 break;
1315 case SOUND_MIXER_RECSRC:
1316 v = mixer_getrecsrc(m);
1317 break;
1318 default:
1319 v = mixer_get(m, j);
1320 }
1321 *arg_i = v;
1322 snd_mtxunlock(m->lock);
1323 return ((v != -1) ? 0 : ENXIO);
1324 }
1325 done:
1326 snd_mtxunlock(m->lock);
1327 return (ret);
1328 }
1329
1330 static void
1331 mixer_clone(void *arg,
1332 #if __FreeBSD_version >= 600034
1333 struct ucred *cred,
1334 #endif
1335 char *name, int namelen, struct cdev **dev)
1336 {
1337 struct snddev_info *d;
1338
1339 if (*dev != NULL)
1340 return;
1341 if (strcmp(name, "mixer") == 0) {
1342 d = devclass_get_softc(pcm_devclass, snd_unit);
1343 if (PCM_REGISTERED(d) && d->mixer_dev != NULL) {
1344 *dev = d->mixer_dev;
1345 dev_ref(*dev);
1346 }
1347 }
1348 }
1349
1350 static void
1351 mixer_sysinit(void *p)
1352 {
1353 if (mixer_ehtag != NULL)
1354 return;
1355 mixer_ehtag = EVENTHANDLER_REGISTER(dev_clone, mixer_clone, 0, 1000);
1356 }
1357
1358 static void
1359 mixer_sysuninit(void *p)
1360 {
1361 if (mixer_ehtag == NULL)
1362 return;
1363 EVENTHANDLER_DEREGISTER(dev_clone, mixer_ehtag);
1364 mixer_ehtag = NULL;
1365 }
1366
1367 SYSINIT(mixer_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysinit, NULL);
1368 SYSUNINIT(mixer_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysuninit, NULL);
1369
1370 /**
1371 * @brief Handler for SNDCTL_MIXERINFO
1372 *
1373 * This function searches for a mixer based on the numeric ID stored
1374 * in oss_miserinfo::dev. If set to -1, then information about the
1375 * current mixer handling the request is provided. Note, however, that
1376 * this ioctl may be made with any sound device (audio, mixer, midi).
1377 *
1378 * @note Caller must not hold any PCM device, channel, or mixer locks.
1379 *
1380 * See http://manuals.opensound.com/developer/SNDCTL_MIXERINFO.html for
1381 * more information.
1382 *
1383 * @param i_dev character device on which the ioctl arrived
1384 * @param arg user argument (oss_mixerinfo *)
1385 *
1386 * @retval EINVAL oss_mixerinfo::dev specified a bad value
1387 * @retval 0 success
1388 */
1389 int
1390 mixer_oss_mixerinfo(struct cdev *i_dev, oss_mixerinfo *mi)
1391 {
1392 struct snddev_info *d;
1393 struct snd_mixer *m;
1394 int nmix, i;
1395
1396 /*
1397 * If probing the device handling the ioctl, make sure it's a mixer
1398 * device. (This ioctl is valid on audio, mixer, and midi devices.)
1399 */
1400 if (mi->dev == -1 && i_dev->si_devsw != &mixer_cdevsw)
1401 return (EINVAL);
1402
1403 d = NULL;
1404 m = NULL;
1405 nmix = 0;
1406
1407 /*
1408 * There's a 1:1 relationship between mixers and PCM devices, so
1409 * begin by iterating over PCM devices and search for our mixer.
1410 */
1411 for (i = 0; pcm_devclass != NULL &&
1412 i < devclass_get_maxunit(pcm_devclass); i++) {
1413 d = devclass_get_softc(pcm_devclass, i);
1414 if (!PCM_REGISTERED(d))
1415 continue;
1416
1417 /* XXX Need Giant magic entry */
1418
1419 /* See the note in function docblock. */
1420 PCM_UNLOCKASSERT(d);
1421 PCM_LOCK(d);
1422
1423 if (d->mixer_dev != NULL && d->mixer_dev->si_drv1 != NULL &&
1424 ((mi->dev == -1 && d->mixer_dev == i_dev) ||
1425 mi->dev == nmix)) {
1426 m = d->mixer_dev->si_drv1;
1427 mtx_lock(m->lock);
1428
1429 /*
1430 * At this point, the following synchronization stuff
1431 * has happened:
1432 * - a specific PCM device is locked.
1433 * - a specific mixer device has been locked, so be
1434 * sure to unlock when existing.
1435 */
1436 bzero((void *)mi, sizeof(*mi));
1437 mi->dev = nmix;
1438 snprintf(mi->id, sizeof(mi->id), "mixer%d", i);
1439 strlcpy(mi->name, m->name, sizeof(mi->name));
1440 mi->modify_counter = m->modify_counter;
1441 mi->card_number = i;
1442 /*
1443 * Currently, FreeBSD assumes 1:1 relationship between
1444 * a pcm and mixer devices, so this is hardcoded to 0.
1445 */
1446 mi->port_number = 0;
1447
1448 /**
1449 * @todo Fill in @sa oss_mixerinfo::mixerhandle.
1450 * @note From 4Front: "mixerhandle is an arbitrary
1451 * string that identifies the mixer better than
1452 * the device number (mixerinfo.dev). Device
1453 * numbers may change depending on the order the
1454 * drivers are loaded. However the handle should
1455 * remain the same provided that the sound card
1456 * is not moved to another PCI slot."
1457 */
1458
1459 /**
1460 * @note
1461 * @sa oss_mixerinfo::magic is a reserved field.
1462 *
1463 * @par
1464 * From 4Front: "magic is usually 0. However some
1465 * devices may have dedicated setup utilities and the
1466 * magic field may contain an unique driver specific
1467 * value (managed by [4Front])."
1468 */
1469
1470 mi->enabled = device_is_attached(m->dev) ? 1 : 0;
1471 /**
1472 * The only flag for @sa oss_mixerinfo::caps is
1473 * currently MIXER_CAP_VIRTUAL, which I'm not sure we
1474 * really worry about.
1475 */
1476 /**
1477 * Mixer extensions currently aren't supported, so
1478 * leave @sa oss_mixerinfo::nrext blank for now.
1479 */
1480 /**
1481 * @todo Fill in @sa oss_mixerinfo::priority (requires
1482 * touching drivers?)
1483 * @note The priority field is for mixer applets to
1484 * determine which mixer should be the default, with 0
1485 * being least preferred and 10 being most preferred.
1486 * From 4Front: "OSS drivers like ICH use higher
1487 * values (10) because such chips are known to be used
1488 * only on motherboards. Drivers for high end pro
1489 * devices use 0 because they will never be the
1490 * default mixer. Other devices use values 1 to 9
1491 * depending on the estimated probability of being the
1492 * default device.
1493 *
1494 * XXX Described by Hannu@4Front, but not found in
1495 * soundcard.h.
1496 strlcpy(mi->devnode, d->mixer_dev->si_name,
1497 sizeof(mi->devnode));
1498 mi->legacy_device = i;
1499 */
1500 mtx_unlock(m->lock);
1501 } else
1502 ++nmix;
1503
1504 PCM_UNLOCK(d);
1505
1506 if (m != NULL)
1507 return (0);
1508 }
1509
1510 return (EINVAL);
1511 }
1512
1513 /*
1514 * Allow the sound driver to use the mixer lock to protect its mixer
1515 * data:
1516 */
1517 struct mtx *
1518 mixer_get_lock(struct snd_mixer *m)
1519 {
1520 if (m->lock == NULL) {
1521 return (&Giant);
1522 }
1523 return (m->lock);
1524 }
1525
1526 int
1527 mix_get_locked(struct snd_mixer *m, u_int dev, int *pleft, int *pright)
1528 {
1529 int level;
1530
1531 level = mixer_get(m, dev);
1532 if (level < 0) {
1533 *pright = *pleft = -1;
1534 return (-1);
1535 }
1536
1537 *pleft = level & 0xFF;
1538 *pright = (level >> 8) & 0xFF;
1539
1540 return (0);
1541 }
1542
1543 int
1544 mix_set_locked(struct snd_mixer *m, u_int dev, int left, int right)
1545 {
1546 int level;
1547
1548 level = (left & 0xFF) | ((right & 0xFF) << 8);
1549
1550 return (mixer_set(m, dev, level));
1551 }
Cache object: 57d48f0e04c4156e47a92c6020e7e4e3
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