sys/dev/sound/pcm/dsp.c

   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 #include <sys/ctype.h>
  35 #include <sys/sysent.h>
  36
  37 SND_DECLARE_FILE("$FreeBSD$");
  38
  39 static int dsp_mmap_allow_prot_exec = 0;
  40 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
  41     &dsp_mmap_allow_prot_exec, 0,
  42     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
  43
  44 struct dsp_cdevinfo {
  45         struct pcm_channel *rdch, *wrch;
  46         struct pcm_channel *volch;
  47         int busy, simplex;
  48         TAILQ_ENTRY(dsp_cdevinfo) link;
  49 };
  50
  51 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  52 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  53 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  54 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  55
  56 #define DSP_CDEVINFO_CACHESIZE  8
  57
  58 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  59                                  (y) != NULL && (y)->si_drv1 != NULL)
  60
  61 #define OLDPCM_IOCTL
  62
  63 static d_open_t dsp_open;
  64 static d_close_t dsp_close;
  65 static d_read_t dsp_read;
  66 static d_write_t dsp_write;
  67 static d_ioctl_t dsp_ioctl;
  68 static d_poll_t dsp_poll;
  69 static d_mmap_t dsp_mmap;
  70
  71 struct cdevsw dsp_cdevsw = {
  72         .d_version =    D_VERSION,
  73         .d_open =       dsp_open,
  74         .d_close =      dsp_close,
  75         .d_read =       dsp_read,
  76         .d_write =      dsp_write,
  77         .d_ioctl =      dsp_ioctl,
  78         .d_poll =       dsp_poll,
  79         .d_mmap =       dsp_mmap,
  80         .d_name =       "dsp",
  81 };
  82
  83 static eventhandler_tag dsp_ehtag = NULL;
  84 static int dsp_umax = -1;
  85 static int dsp_cmax = -1;
  86
  87 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
  88 static int dsp_oss_syncstart(int sg_id);
  89 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
  90 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
  91 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  92 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  93 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
  94 #ifdef OSSV4_EXPERIMENT
  95 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  96 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  97 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  98 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  99 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 100 #endif
 101
 102 static struct snddev_info *
 103 dsp_get_info(struct cdev *dev)
 104 {
 105         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 106 }
 107
 108 static uint32_t
 109 dsp_get_flags(struct cdev *dev)
 110 {
 111         device_t bdev;
 112
 113         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 114
 115         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 116 }
 117
 118 static void
 119 dsp_set_flags(struct cdev *dev, uint32_t flags)
 120 {
 121         device_t bdev;
 122
 123         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 124
 125         if (bdev != NULL)
 126                 pcm_setflags(bdev, flags);
 127 }
 128
 129 /*
 130  * return the channels associated with an open device instance.
 131  * lock channels specified.
 132  */
 133 static int
 134 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 135     uint32_t prio)
 136 {
 137         struct snddev_info *d;
 138         struct pcm_channel *ch;
 139         uint32_t flags;
 140
 141         if (PCM_SIMPLEX(dev) != 0) {
 142                 d = dsp_get_info(dev);
 143                 if (!PCM_REGISTERED(d))
 144                         return (ENXIO);
 145                 PCM_LOCK(d);
 146                 PCM_WAIT(d);
 147                 PCM_ACQUIRE(d);
 148                 /*
 149                  * Note: order is important -
 150                  *       pcm flags -> prio query flags -> wild guess
 151                  */
 152                 ch = NULL;
 153                 flags = dsp_get_flags(dev);
 154                 if (flags & SD_F_PRIO_WR) {
 155                         ch = PCM_RDCH(dev);
 156                         PCM_RDCH(dev) = NULL;
 157                 } else if (flags & SD_F_PRIO_RD) {
 158                         ch = PCM_WRCH(dev);
 159                         PCM_WRCH(dev) = NULL;
 160                 } else if (prio & SD_F_PRIO_WR) {
 161                         ch = PCM_RDCH(dev);
 162                         PCM_RDCH(dev) = NULL;
 163                         flags |= SD_F_PRIO_WR;
 164                 } else if (prio & SD_F_PRIO_RD) {
 165                         ch = PCM_WRCH(dev);
 166                         PCM_WRCH(dev) = NULL;
 167                         flags |= SD_F_PRIO_RD;
 168                 } else if (PCM_WRCH(dev) != NULL) {
 169                         ch = PCM_RDCH(dev);
 170                         PCM_RDCH(dev) = NULL;
 171                         flags |= SD_F_PRIO_WR;
 172                 } else if (PCM_RDCH(dev) != NULL) {
 173                         ch = PCM_WRCH(dev);
 174                         PCM_WRCH(dev) = NULL;
 175                         flags |= SD_F_PRIO_RD;
 176                 }
 177                 PCM_SIMPLEX(dev) = 0;
 178                 dsp_set_flags(dev, flags);
 179                 if (ch != NULL) {
 180                         CHN_LOCK(ch);
 181                         pcm_chnref(ch, -1);
 182                         pcm_chnrelease(ch);
 183                 }
 184                 PCM_RELEASE(d);
 185                 PCM_UNLOCK(d);
 186         }
 187
 188         *rdch = PCM_RDCH(dev);
 189         *wrch = PCM_WRCH(dev);
 190
 191         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 192                 CHN_LOCK(*rdch);
 193         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 194                 CHN_LOCK(*wrch);
 195
 196         return (0);
 197 }
 198
 199 /* unlock specified channels */
 200 static void
 201 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 202     uint32_t prio)
 203 {
 204         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 205                 CHN_UNLOCK(wrch);
 206         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 207                 CHN_UNLOCK(rdch);
 208 }
 209
 210 static void
 211 dsp_cdevinfo_alloc(struct cdev *dev,
 212     struct pcm_channel *rdch, struct pcm_channel *wrch,
 213     struct pcm_channel *volch)
 214 {
 215         struct snddev_info *d;
 216         struct dsp_cdevinfo *cdi;
 217         int simplex;
 218
 219         d = dsp_get_info(dev);
 220
 221         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 222             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 223             ("bogus %s(), what are you trying to accomplish here?", __func__));
 224         PCM_BUSYASSERT(d);
 225         PCM_LOCKASSERT(d);
 226
 227         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 228
 229         /*
 230          * Scan for free instance entry and put it into the end of list.
 231          * Create new one if necessary.
 232          */
 233         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 234                 if (cdi->busy != 0)
 235                         break;
 236                 cdi->rdch = rdch;
 237                 cdi->wrch = wrch;
 238                 cdi->volch = volch;
 239                 cdi->simplex = simplex;
 240                 cdi->busy = 1;
 241                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 242                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 243                 dev->si_drv1 = cdi;
 244                 return;
 245         }
 246         PCM_UNLOCK(d);
 247         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 248         PCM_LOCK(d);
 249         cdi->rdch = rdch;
 250         cdi->wrch = wrch;
 251         cdi->volch = volch;
 252         cdi->simplex = simplex;
 253         cdi->busy = 1;
 254         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 255         dev->si_drv1 = cdi;
 256 }
 257
 258 static void
 259 dsp_cdevinfo_free(struct cdev *dev)
 260 {
 261         struct snddev_info *d;
 262         struct dsp_cdevinfo *cdi, *tmp;
 263         uint32_t flags;
 264         int i;
 265
 266         d = dsp_get_info(dev);
 267
 268         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 269             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 270             PCM_VOLCH(dev) == NULL,
 271             ("bogus %s(), what are you trying to accomplish here?", __func__));
 272         PCM_BUSYASSERT(d);
 273         PCM_LOCKASSERT(d);
 274
 275         cdi = dev->si_drv1;
 276         dev->si_drv1 = NULL;
 277         cdi->rdch = NULL;
 278         cdi->wrch = NULL;
 279         cdi->volch = NULL;
 280         cdi->simplex = 0;
 281         cdi->busy = 0;
 282
 283         /*
 284          * Once it is free, move it back to the beginning of list for
 285          * faster new entry allocation.
 286          */
 287         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 288         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 289
 290         /*
 291          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 292          * Reset simplex flags.
 293          */
 294         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 295         i = DSP_CDEVINFO_CACHESIZE;
 296         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 297                 if (cdi->busy != 0) {
 298                         if (cdi->simplex == 0) {
 299                                 if (cdi->rdch != NULL)
 300                                         flags |= SD_F_PRIO_RD;
 301                                 if (cdi->wrch != NULL)
 302                                         flags |= SD_F_PRIO_WR;
 303                         }
 304                 } else {
 305                         if (i == 0) {
 306                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 307                                 free(cdi, M_DEVBUF);
 308                         } else
 309                                 i--;
 310                 }
 311         }
 312         dsp_set_flags(dev, flags);
 313 }
 314
 315 void
 316 dsp_cdevinfo_init(struct snddev_info *d)
 317 {
 318         struct dsp_cdevinfo *cdi;
 319         int i;
 320
 321         KASSERT(d != NULL, ("NULL snddev_info"));
 322         PCM_BUSYASSERT(d);
 323         PCM_UNLOCKASSERT(d);
 324
 325         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 326         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 327                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 328                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 329         }
 330 }
 331
 332 void
 333 dsp_cdevinfo_flush(struct snddev_info *d)
 334 {
 335         struct dsp_cdevinfo *cdi, *tmp;
 336
 337         KASSERT(d != NULL, ("NULL snddev_info"));
 338         PCM_BUSYASSERT(d);
 339         PCM_UNLOCKASSERT(d);
 340
 341         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 342         while (cdi != NULL) {
 343                 tmp = TAILQ_NEXT(cdi, link);
 344                 free(cdi, M_DEVBUF);
 345                 cdi = tmp;
 346         }
 347         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 348 }
 349
 350 /* duplex / simplex cdev type */
 351 enum {
 352         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 353         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 354         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 355 };
 356
 357 enum {
 358         DSP_CDEV_VOLCTL_NONE,
 359         DSP_CDEV_VOLCTL_READ,
 360         DSP_CDEV_VOLCTL_WRITE
 361 };
 362
 363 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 364 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 365 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 366 #define DSP_F_READ(x)           ((x) & FREAD)
 367 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 368
 369 static const struct {
 370         int type;
 371         char *name;
 372         char *sep;
 373         char *alias;
 374         int use_sep;
 375         int hw;
 376         int max;
 377         int volctl;
 378         uint32_t fmt, spd;
 379         int query;
 380 } dsp_cdevs[] = {
 381         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 382           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 383           DSP_CDEV_TYPE_RDWR },
 384         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 385           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 386           DSP_CDEV_TYPE_RDWR },
 387         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 388           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 389           DSP_CDEV_TYPE_RDWR },
 390         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 391           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 392         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 393           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 394         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 395           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 396         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 397           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 398         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 399           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 400         /* Low priority, OSSv4 aliases. */
 401         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
 402           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 403           DSP_CDEV_TYPE_RDWR },
 404         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
 405           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 406           DSP_CDEV_TYPE_RDWR },
 407         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
 408           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 409           DSP_CDEV_TYPE_RDWR },
 410         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
 411           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 412           DSP_CDEV_TYPE_RDWR },
 413         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
 414           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 415           DSP_CDEV_TYPE_RDWR },
 416 };
 417
 418 #define DSP_FIXUP_ERROR()               do {                            \
 419         prio = dsp_get_flags(i_dev);                                    \
 420         if (!DSP_F_VALID(flags))                                        \
 421                 error = EINVAL;                                         \
 422         if (!DSP_F_DUPLEX(flags) &&                                     \
 423             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 424             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 425                 error = ENOTSUP;                                        \
 426         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 427             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 428             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 429                 error = EBUSY;                                          \
 430         else if (DSP_REGISTERED(d, i_dev))                              \
 431                 error = EBUSY;                                          \
 432 } while (0)
 433
 434 static int
 435 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
 436 {
 437         struct pcm_channel *rdch, *wrch;
 438         struct snddev_info *d;
 439         uint32_t fmt, spd, prio, volctl;
 440         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 441
 442         /* Kind of impossible.. */
 443         if (i_dev == NULL || td == NULL)
 444                 return (ENODEV);
 445
 446         d = dsp_get_info(i_dev);
 447         if (!PCM_REGISTERED(d))
 448                 return (EBADF);
 449
 450         PCM_GIANT_ENTER(d);
 451
 452         /* Lock snddev so nobody else can monkey with it. */
 453         PCM_LOCK(d);
 454         PCM_WAIT(d);
 455
 456         /*
 457          * Try to acquire cloned device before someone else pick it.
 458          * ENODEV means this is not a cloned droids.
 459          */
 460         error = snd_clone_acquire(i_dev);
 461         if (!(error == 0 || error == ENODEV)) {
 462                 DSP_FIXUP_ERROR();
 463                 PCM_UNLOCK(d);
 464                 PCM_GIANT_EXIT(d);
 465                 return (error);
 466         }
 467
 468         error = 0;
 469         DSP_FIXUP_ERROR();
 470
 471         if (error != 0) {
 472                 (void)snd_clone_release(i_dev);
 473                 PCM_UNLOCK(d);
 474                 PCM_GIANT_EXIT(d);
 475                 return (error);
 476         }
 477
 478         /*
 479          * That is just enough. Acquire and unlock pcm lock so
 480          * the other will just have to wait until we finish doing
 481          * everything.
 482          */
 483         PCM_ACQUIRE(d);
 484         PCM_UNLOCK(d);
 485
 486         devtype = PCMDEV(i_dev);
 487         wdevunit = -1;
 488         rdevunit = -1;
 489         fmt = 0;
 490         spd = 0;
 491         volctl = DSP_CDEV_VOLCTL_NONE;
 492
 493         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 494                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 495                         continue;
 496                 /*
 497                  * Volume control only valid for DSPHW devices,
 498                  * and it must be opened in opposite direction be it
 499                  * simplex or duplex. Anything else will be handled
 500                  * as usual.
 501                  */
 502                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 503                         if (dsp_cdevs[i].volctl != 0 &&
 504                             DSP_F_READ(flags)) {
 505                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 506                                 flags &= ~FREAD;
 507                                 flags |= FWRITE;
 508                         }
 509                         if (DSP_F_READ(flags)) {
 510                                 (void)snd_clone_release(i_dev);
 511                                 PCM_RELEASE_QUICK(d);
 512                                 PCM_GIANT_EXIT(d);
 513                                 return (ENOTSUP);
 514                         }
 515                         wdevunit = dev2unit(i_dev);
 516                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 517                         if (dsp_cdevs[i].volctl != 0 &&
 518                             DSP_F_WRITE(flags)) {
 519                                 volctl = DSP_CDEV_VOLCTL_READ;
 520                                 flags &= ~FWRITE;
 521                                 flags |= FREAD;
 522                         }
 523                         if (DSP_F_WRITE(flags)) {
 524                                 (void)snd_clone_release(i_dev);
 525                                 PCM_RELEASE_QUICK(d);
 526                                 PCM_GIANT_EXIT(d);
 527                                 return (ENOTSUP);
 528                         }
 529                         rdevunit = dev2unit(i_dev);
 530                 }
 531                 fmt = dsp_cdevs[i].fmt;
 532                 spd = dsp_cdevs[i].spd;
 533                 break;
 534         }
 535
 536         /* No matching devtype? */
 537         if (fmt == 0 || spd == 0)
 538                 panic("impossible devtype %d", devtype);
 539
 540         rdch = NULL;
 541         wrch = NULL;
 542         rderror = 0;
 543         wrerror = 0;
 544
 545         /*
 546          * if we get here, the open request is valid- either:
 547          *   * we were previously not open
 548          *   * we were open for play xor record and the opener wants
 549          *     the non-open direction
 550          */
 551         if (DSP_F_READ(flags)) {
 552                 /* open for read */
 553                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 554                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
 555
 556                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 557                         rderror = ENXIO;
 558
 559                 if (volctl == DSP_CDEV_VOLCTL_READ)
 560                         rderror = 0;
 561
 562                 if (rderror != 0) {
 563                         if (rdch != NULL)
 564                                 pcm_chnrelease(rdch);
 565                         if (!DSP_F_DUPLEX(flags)) {
 566                                 (void)snd_clone_release(i_dev);
 567                                 PCM_RELEASE_QUICK(d);
 568                                 PCM_GIANT_EXIT(d);
 569                                 return (rderror);
 570                         }
 571                         rdch = NULL;
 572                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 573                         if (rdch != NULL) {
 574                                 pcm_chnref(rdch, 1);
 575                                 pcm_chnrelease(rdch);
 576                         }
 577                 } else {
 578                         if (flags & O_NONBLOCK)
 579                                 rdch->flags |= CHN_F_NBIO;
 580                         if (flags & O_EXCL)
 581                                 rdch->flags |= CHN_F_EXCLUSIVE;
 582                         pcm_chnref(rdch, 1);
 583                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 584                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 585                         CHN_UNLOCK(rdch);
 586                 }
 587         }
 588
 589         if (DSP_F_WRITE(flags)) {
 590                 /* open for write */
 591                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 592                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
 593
 594                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 595                         wrerror = ENXIO;
 596
 597                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 598                         wrerror = 0;
 599
 600                 if (wrerror != 0) {
 601                         if (wrch != NULL)
 602                                 pcm_chnrelease(wrch);
 603                         if (!DSP_F_DUPLEX(flags)) {
 604                                 if (rdch != NULL) {
 605                                         /*
 606                                          * Lock, deref and release previously
 607                                          * created record channel
 608                                          */
 609                                         CHN_LOCK(rdch);
 610                                         pcm_chnref(rdch, -1);
 611                                         pcm_chnrelease(rdch);
 612                                 }
 613                                 (void)snd_clone_release(i_dev);
 614                                 PCM_RELEASE_QUICK(d);
 615                                 PCM_GIANT_EXIT(d);
 616                                 return (wrerror);
 617                         }
 618                         wrch = NULL;
 619                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 620                         if (wrch != NULL) {
 621                                 pcm_chnref(wrch, 1);
 622                                 pcm_chnrelease(wrch);
 623                         }
 624                 } else {
 625                         if (flags & O_NONBLOCK)
 626                                 wrch->flags |= CHN_F_NBIO;
 627                         if (flags & O_EXCL)
 628                                 wrch->flags |= CHN_F_EXCLUSIVE;
 629                         pcm_chnref(wrch, 1);
 630                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 631                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 632                         CHN_UNLOCK(wrch);
 633                 }
 634         }
 635
 636
 637         PCM_LOCK(d);
 638
 639         /*
 640          * We're done. Allocate channels information for this cdev.
 641          */
 642         switch (volctl) {
 643         case DSP_CDEV_VOLCTL_READ:
 644                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 645                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 646                 break;
 647         case DSP_CDEV_VOLCTL_WRITE:
 648                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 649                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 650                 break;
 651         case DSP_CDEV_VOLCTL_NONE:
 652         default:
 653                 if (wrch == NULL && rdch == NULL) {
 654                         (void)snd_clone_release(i_dev);
 655                         PCM_RELEASE(d);
 656                         PCM_UNLOCK(d);
 657                         PCM_GIANT_EXIT(d);
 658                         if (wrerror != 0)
 659                                 return (wrerror);
 660                         if (rderror != 0)
 661                                 return (rderror);
 662                         return (EINVAL);
 663                 }
 664                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 665                 if (rdch != NULL)
 666                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 667                 if (wrch != NULL)
 668                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 669                 break;
 670         }
 671
 672         /*
 673          * Increase clone refcount for its automatic garbage collector.
 674          */
 675         (void)snd_clone_ref(i_dev);
 676
 677         PCM_RELEASE(d);
 678         PCM_UNLOCK(d);
 679
 680         PCM_GIANT_LEAVE(d);
 681
 682         return (0);
 683 }
 684
 685 static int
 686 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 687 {
 688         struct pcm_channel *rdch, *wrch, *volch;
 689         struct snddev_info *d;
 690         int sg_ids, rdref, wdref;
 691
 692         d = dsp_get_info(i_dev);
 693         if (!DSP_REGISTERED(d, i_dev))
 694                 return (EBADF);
 695
 696         PCM_GIANT_ENTER(d);
 697
 698         PCM_LOCK(d);
 699         PCM_WAIT(d);
 700         PCM_ACQUIRE(d);
 701
 702         rdch = PCM_RDCH(i_dev);
 703         wrch = PCM_WRCH(i_dev);
 704         volch = PCM_VOLCH(i_dev);
 705
 706         PCM_RDCH(i_dev) = NULL;
 707         PCM_WRCH(i_dev) = NULL;
 708         PCM_VOLCH(i_dev) = NULL;
 709
 710         rdref = -1;
 711         wdref = -1;
 712
 713         if (volch != NULL) {
 714                 if (volch == rdch)
 715                         rdref--;
 716                 else if (volch == wrch)
 717                         wdref--;
 718                 else {
 719                         CHN_LOCK(volch);
 720                         pcm_chnref(volch, -1);
 721                         CHN_UNLOCK(volch);
 722                 }
 723         }
 724
 725         if (rdch != NULL)
 726                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 727         if (wrch != NULL)
 728                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 729
 730         if (rdch != NULL || wrch != NULL) {
 731                 PCM_UNLOCK(d);
 732                 if (rdch != NULL) {
 733                         /*
 734                          * The channel itself need not be locked because:
 735                          *   a)  Adding a channel to a syncgroup happens only
 736                          *       in dsp_ioctl(), which cannot run concurrently
 737                          *       to dsp_close().
 738                          *   b)  The syncmember pointer (sm) is protected by
 739                          *       the global syncgroup list lock.
 740                          *   c)  A channel can't just disappear, invalidating
 741                          *       pointers, unless it's closed/dereferenced
 742                          *       first.
 743                          */
 744                         PCM_SG_LOCK();
 745                         sg_ids = chn_syncdestroy(rdch);
 746                         PCM_SG_UNLOCK();
 747                         if (sg_ids != 0)
 748                                 free_unr(pcmsg_unrhdr, sg_ids);
 749
 750                         CHN_LOCK(rdch);
 751                         pcm_chnref(rdch, rdref);
 752                         chn_abort(rdch); /* won't sleep */
 753                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 754                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 755                         chn_reset(rdch, 0, 0);
 756                         pcm_chnrelease(rdch);
 757                 }
 758                 if (wrch != NULL) {
 759                         /*
 760                          * Please see block above.
 761                          */
 762                         PCM_SG_LOCK();
 763                         sg_ids = chn_syncdestroy(wrch);
 764                         PCM_SG_UNLOCK();
 765                         if (sg_ids != 0)
 766                                 free_unr(pcmsg_unrhdr, sg_ids);
 767
 768                         CHN_LOCK(wrch);
 769                         pcm_chnref(wrch, wdref);
 770                         chn_flush(wrch); /* may sleep */
 771                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 772                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 773                         chn_reset(wrch, 0, 0);
 774                         pcm_chnrelease(wrch);
 775                 }
 776                 PCM_LOCK(d);
 777         }
 778
 779         dsp_cdevinfo_free(i_dev);
 780         /*
 781          * Release clone busy state and unref it so the automatic
 782          * garbage collector will get the hint and do the remaining
 783          * cleanup process.
 784          */
 785         (void)snd_clone_release(i_dev);
 786
 787         /*
 788          * destroy_dev() might sleep, so release pcm lock
 789          * here and rely on pcm cv serialization.
 790          */
 791         PCM_UNLOCK(d);
 792         (void)snd_clone_unref(i_dev);
 793         PCM_LOCK(d);
 794
 795         PCM_RELEASE(d);
 796         PCM_UNLOCK(d);
 797
 798         PCM_GIANT_LEAVE(d);
 799
 800         return (0);
 801 }
 802
 803 static __inline int
 804 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 805 {
 806         struct snddev_info *d;
 807         struct pcm_channel **ch, *rdch, *wrch;
 808         int (*chn_io)(struct pcm_channel *, struct uio *);
 809         int prio, ret;
 810         pid_t runpid;
 811
 812         KASSERT(i_dev != NULL && buf != NULL &&
 813             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 814             ("%s(): io train wreck!", __func__));
 815
 816         d = dsp_get_info(i_dev);
 817         if (!DSP_REGISTERED(d, i_dev))
 818                 return (EBADF);
 819
 820         PCM_GIANT_ENTER(d);
 821
 822         switch (buf->uio_rw) {
 823         case UIO_READ:
 824                 prio = SD_F_PRIO_RD;
 825                 ch = &rdch;
 826                 chn_io = chn_read;
 827                 break;
 828         case UIO_WRITE:
 829                 prio = SD_F_PRIO_WR;
 830                 ch = &wrch;
 831                 chn_io = chn_write;
 832                 break;
 833         default:
 834                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 835                 break;
 836         }
 837
 838         rdch = NULL;
 839         wrch = NULL;
 840         runpid = buf->uio_td->td_proc->p_pid;
 841
 842         getchns(i_dev, &rdch, &wrch, prio);
 843
 844         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 845                 PCM_GIANT_EXIT(d);
 846                 return (EBADF);
 847         }
 848
 849         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 850             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 851                 relchns(i_dev, rdch, wrch, prio);
 852                 PCM_GIANT_EXIT(d);
 853                 return (EINVAL);
 854         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 855                 (*ch)->flags |= CHN_F_RUNNING;
 856                 (*ch)->pid = runpid;
 857         }
 858
 859         /*
 860          * chn_read/write must give up channel lock in order to copy bytes
 861          * from/to userland, so up the "in progress" counter to make sure
 862          * someone else doesn't come along and muss up the buffer.
 863          */
 864         ++(*ch)->inprog;
 865         ret = chn_io(*ch, buf);
 866         --(*ch)->inprog;
 867
 868         CHN_BROADCAST(&(*ch)->cv);
 869
 870         relchns(i_dev, rdch, wrch, prio);
 871
 872         PCM_GIANT_LEAVE(d);
 873
 874         return (ret);
 875 }
 876
 877 static int
 878 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
 879 {
 880         return (dsp_io_ops(i_dev, buf));
 881 }
 882
 883 static int
 884 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
 885 {
 886         return (dsp_io_ops(i_dev, buf));
 887 }
 888
 889 static int
 890 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 891 {
 892         struct snddev_info *d;
 893         struct pcm_channel *c;
 894         int unit;
 895
 896         KASSERT(dev != NULL && volch != NULL,
 897             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 898
 899         d = dsp_get_info(dev);
 900         if (!PCM_REGISTERED(d)) {
 901                 *volch = NULL;
 902                 return (EINVAL);
 903         }
 904
 905         PCM_UNLOCKASSERT(d);
 906
 907         *volch = NULL;
 908
 909         c = PCM_VOLCH(dev);
 910         if (c != NULL) {
 911                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 912                         return (-1);
 913                 *volch = c;
 914                 return (0);
 915         }
 916
 917         PCM_LOCK(d);
 918         PCM_WAIT(d);
 919         PCM_ACQUIRE(d);
 920
 921         unit = dev2unit(dev);
 922
 923         CHN_FOREACH(c, d, channels.pcm) {
 924                 CHN_LOCK(c);
 925                 if (c->unit != unit) {
 926                         CHN_UNLOCK(c);
 927                         continue;
 928                 }
 929                 *volch = c;
 930                 pcm_chnref(c, 1);
 931                 PCM_VOLCH(dev) = c;
 932                 CHN_UNLOCK(c);
 933                 PCM_RELEASE(d);
 934                 PCM_UNLOCK(d);
 935                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 936         }
 937
 938         PCM_RELEASE(d);
 939         PCM_UNLOCK(d);
 940
 941         return (EINVAL);
 942 }
 943
 944 static int
 945 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 946     caddr_t arg)
 947 {
 948         struct snddev_info *d;
 949         struct pcm_channel *rdch, *wrch;
 950         int j, devtype, ret;
 951
 952         d = dsp_get_info(dev);
 953         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 954                 return (-1);
 955
 956         PCM_UNLOCKASSERT(d);
 957
 958         j = cmd & 0xff;
 959
 960         rdch = PCM_RDCH(dev);
 961         wrch = PCM_WRCH(dev);
 962
 963         /* No specific channel, look into cache */
 964         if (volch == NULL)
 965                 volch = PCM_VOLCH(dev);
 966
 967         /* Look harder */
 968         if (volch == NULL) {
 969                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 970                         volch = rdch;
 971                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 972                         volch = wrch;
 973         }
 974
 975         devtype = PCMDEV(dev);
 976
 977         /* Look super harder */
 978         if (volch == NULL &&
 979             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 980             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 981                 ret = dsp_get_volume_channel(dev, &volch);
 982                 if (ret != 0)
 983                         return (ret);
 984                 if (volch == NULL)
 985                         return (EINVAL);
 986         }
 987
 988         /* Final validation */
 989         if (volch != NULL) {
 990                 CHN_LOCK(volch);
 991                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
 992                         CHN_UNLOCK(volch);
 993                         return (-1);
 994                 }
 995                 if (volch->direction == PCMDIR_PLAY)
 996                         wrch = volch;
 997                 else
 998                         rdch = volch;
 999         }
1000
1001         ret = EINVAL;
1002
1003         if (volch != NULL &&
1004             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1005             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1006                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1007                         int left, right, center;
1008
1009                         left = *(int *)arg & 0x7f;
1010                         right = ((*(int *)arg) >> 8) & 0x7f;
1011                         center = (left + right) >> 1;
1012                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1013                             center);
1014                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1015                         *(int *)arg = CHN_GETVOLUME(volch,
1016                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1017                         *(int *)arg |= CHN_GETVOLUME(volch,
1018                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1019                 }
1020                 ret = 0;
1021         } else if (rdch != NULL || wrch != NULL) {
1022                 switch (j) {
1023                 case SOUND_MIXER_DEVMASK:
1024                 case SOUND_MIXER_CAPS:
1025                 case SOUND_MIXER_STEREODEVS:
1026                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1027                                 *(int *)arg = 0;
1028                                 if (rdch != NULL)
1029                                         *(int *)arg |= SOUND_MASK_RECLEV;
1030                                 if (wrch != NULL)
1031                                         *(int *)arg |= SOUND_MASK_PCM;
1032                         }
1033                         ret = 0;
1034                         break;
1035                 case SOUND_MIXER_RECMASK:
1036                 case SOUND_MIXER_RECSRC:
1037                         if ((cmd & ~0xff) == MIXER_READ(0))
1038                                 *(int *)arg = 0;
1039                         ret = 0;
1040                         break;
1041                 default:
1042                         break;
1043                 }
1044         }
1045
1046         if (volch != NULL)
1047                 CHN_UNLOCK(volch);
1048
1049         return (ret);
1050 }
1051
1052 static int
1053 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1054     struct thread *td)
1055 {
1056         struct pcm_channel *chn, *rdch, *wrch;
1057         struct snddev_info *d;
1058         int *arg_i, ret, tmp, xcmd;
1059
1060         d = dsp_get_info(i_dev);
1061         if (!DSP_REGISTERED(d, i_dev))
1062                 return (EBADF);
1063
1064         PCM_GIANT_ENTER(d);
1065
1066         arg_i = (int *)arg;
1067         ret = 0;
1068         xcmd = 0;
1069         chn = NULL;
1070
1071         if (IOCGROUP(cmd) == 'M') {
1072                 if (cmd == OSS_GETVERSION) {
1073                         *arg_i = SOUND_VERSION;
1074                         PCM_GIANT_EXIT(d);
1075                         return (0);
1076                 }
1077                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1078                 if (ret != -1) {
1079                         PCM_GIANT_EXIT(d);
1080                         return (ret);
1081                 }
1082
1083                 if (d->mixer_dev != NULL) {
1084                         PCM_ACQUIRE_QUICK(d);
1085                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1086                             MIXER_CMD_DIRECT);
1087                         PCM_RELEASE_QUICK(d);
1088                 } else
1089                         ret = EBADF;
1090
1091                 PCM_GIANT_EXIT(d);
1092
1093                 return (ret);
1094         }
1095
1096         /*
1097          * Certain ioctls may be made on any type of device (audio, mixer,
1098          * and MIDI).  Handle those special cases here.
1099          */
1100         if (IOCGROUP(cmd) == 'X') {
1101                 PCM_ACQUIRE_QUICK(d);
1102                 switch(cmd) {
1103                 case SNDCTL_SYSINFO:
1104                         sound_oss_sysinfo((oss_sysinfo *)arg);
1105                         break;
1106                 case SNDCTL_CARDINFO:
1107                         ret = sound_oss_card_info((oss_card_info *)arg);
1108                         break;
1109                 case SNDCTL_AUDIOINFO:
1110                 case SNDCTL_AUDIOINFO_EX:
1111                 case SNDCTL_ENGINEINFO:
1112                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1113                         break;
1114                 case SNDCTL_MIXERINFO:
1115                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1116                         break;
1117                 default:
1118                         ret = EINVAL;
1119                 }
1120                 PCM_RELEASE_QUICK(d);
1121                 PCM_GIANT_EXIT(d);
1122                 return (ret);
1123         }
1124
1125         getchns(i_dev, &rdch, &wrch, 0);
1126
1127         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1128                 wrch = NULL;
1129         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1130                 rdch = NULL;
1131
1132         if (wrch == NULL && rdch == NULL) {
1133                 PCM_GIANT_EXIT(d);
1134                 return (EINVAL);
1135         }
1136
1137         switch(cmd) {
1138 #ifdef OLDPCM_IOCTL
1139         /*
1140          * we start with the new ioctl interface.
1141          */
1142         case AIONWRITE: /* how many bytes can write ? */
1143                 if (wrch) {
1144                         CHN_LOCK(wrch);
1145 /*
1146                 if (wrch && wrch->bufhard.dl)
1147                         while (chn_wrfeed(wrch) == 0);
1148 */
1149                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1150                         CHN_UNLOCK(wrch);
1151                 } else {
1152                         *arg_i = 0;
1153                         ret = EINVAL;
1154                 }
1155                 break;
1156
1157         case AIOSSIZE:     /* set the current blocksize */
1158                 {
1159                         struct snd_size *p = (struct snd_size *)arg;
1160
1161                         p->play_size = 0;
1162                         p->rec_size = 0;
1163                         PCM_ACQUIRE_QUICK(d);
1164                         if (wrch) {
1165                                 CHN_LOCK(wrch);
1166                                 chn_setblocksize(wrch, 2, p->play_size);
1167                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1168                                 CHN_UNLOCK(wrch);
1169                         }
1170                         if (rdch) {
1171                                 CHN_LOCK(rdch);
1172                                 chn_setblocksize(rdch, 2, p->rec_size);
1173                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1174                                 CHN_UNLOCK(rdch);
1175                         }
1176                         PCM_RELEASE_QUICK(d);
1177                 }
1178                 break;
1179         case AIOGSIZE:  /* get the current blocksize */
1180                 {
1181                         struct snd_size *p = (struct snd_size *)arg;
1182
1183                         if (wrch) {
1184                                 CHN_LOCK(wrch);
1185                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1186                                 CHN_UNLOCK(wrch);
1187                         }
1188                         if (rdch) {
1189                                 CHN_LOCK(rdch);
1190                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1191                                 CHN_UNLOCK(rdch);
1192                         }
1193                 }
1194                 break;
1195
1196         case AIOSFMT:
1197         case AIOGFMT:
1198                 {
1199                         snd_chan_param *p = (snd_chan_param *)arg;
1200
1201                         if (cmd == AIOSFMT &&
1202                             ((p->play_format != 0 && p->play_rate == 0) ||
1203                             (p->rec_format != 0 && p->rec_rate == 0))) {
1204                                 ret = EINVAL;
1205                                 break;
1206                         }
1207                         PCM_ACQUIRE_QUICK(d);
1208                         if (wrch) {
1209                                 CHN_LOCK(wrch);
1210                                 if (cmd == AIOSFMT && p->play_format != 0) {
1211                                         chn_setformat(wrch,
1212                                             SND_FORMAT(p->play_format,
1213                                             AFMT_CHANNEL(wrch->format),
1214                                             AFMT_EXTCHANNEL(wrch->format)));
1215                                         chn_setspeed(wrch, p->play_rate);
1216                                 }
1217                                 p->play_rate = wrch->speed;
1218                                 p->play_format = AFMT_ENCODING(wrch->format);
1219                                 CHN_UNLOCK(wrch);
1220                         } else {
1221                                 p->play_rate = 0;
1222                                 p->play_format = 0;
1223                         }
1224                         if (rdch) {
1225                                 CHN_LOCK(rdch);
1226                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1227                                         chn_setformat(rdch,
1228                                             SND_FORMAT(p->rec_format,
1229                                             AFMT_CHANNEL(rdch->format),
1230                                             AFMT_EXTCHANNEL(rdch->format)));
1231                                         chn_setspeed(rdch, p->rec_rate);
1232                                 }
1233                                 p->rec_rate = rdch->speed;
1234                                 p->rec_format = AFMT_ENCODING(rdch->format);
1235                                 CHN_UNLOCK(rdch);
1236                         } else {
1237                                 p->rec_rate = 0;
1238                                 p->rec_format = 0;
1239                         }
1240                         PCM_RELEASE_QUICK(d);
1241                 }
1242                 break;
1243
1244         case AIOGCAP:     /* get capabilities */
1245                 {
1246                         snd_capabilities *p = (snd_capabilities *)arg;
1247                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1248                         struct cdev *pdev;
1249
1250                         PCM_LOCK(d);
1251                         if (rdch) {
1252                                 CHN_LOCK(rdch);
1253                                 rcaps = chn_getcaps(rdch);
1254                         }
1255                         if (wrch) {
1256                                 CHN_LOCK(wrch);
1257                                 pcaps = chn_getcaps(wrch);
1258                         }
1259                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1260                                           pcaps? pcaps->minspeed : 0);
1261                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1262                                           pcaps? pcaps->maxspeed : 1000000);
1263                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1264                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1265                         /* XXX bad on sb16 */
1266                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1267                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1268                         if (rdch && wrch)
1269                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1270                         pdev = d->mixer_dev;
1271                         p->mixers = 1; /* default: one mixer */
1272                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1273                         p->left = p->right = 100;
1274                         if (wrch)
1275                                 CHN_UNLOCK(wrch);
1276                         if (rdch)
1277                                 CHN_UNLOCK(rdch);
1278                         PCM_UNLOCK(d);
1279                 }
1280                 break;
1281
1282         case AIOSTOP:
1283                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1284                         CHN_LOCK(wrch);
1285                         *arg_i = chn_abort(wrch);
1286                         CHN_UNLOCK(wrch);
1287                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1288                         CHN_LOCK(rdch);
1289                         *arg_i = chn_abort(rdch);
1290                         CHN_UNLOCK(rdch);
1291                 } else {
1292                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1293                         *arg_i = 0;
1294                 }
1295                 break;
1296
1297         case AIOSYNC:
1298                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1299                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1300                 break;
1301 #endif
1302         /*
1303          * here follow the standard ioctls (filio.h etc.)
1304          */
1305         case FIONREAD: /* get # bytes to read */
1306                 if (rdch) {
1307                         CHN_LOCK(rdch);
1308 /*                      if (rdch && rdch->bufhard.dl)
1309                                 while (chn_rdfeed(rdch) == 0);
1310 */
1311                         *arg_i = sndbuf_getready(rdch->bufsoft);
1312                         CHN_UNLOCK(rdch);
1313                 } else {
1314                         *arg_i = 0;
1315                         ret = EINVAL;
1316                 }
1317                 break;
1318
1319         case FIOASYNC: /*set/clear async i/o */
1320                 DEB( printf("FIOASYNC\n") ; )
1321                 break;
1322
1323         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1324         case FIONBIO: /* set/clear non-blocking i/o */
1325                 if (rdch) {
1326                         CHN_LOCK(rdch);
1327                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1328                                 rdch->flags |= CHN_F_NBIO;
1329                         else
1330                                 rdch->flags &= ~CHN_F_NBIO;
1331                         CHN_UNLOCK(rdch);
1332                 }
1333                 if (wrch) {
1334                         CHN_LOCK(wrch);
1335                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1336                                 wrch->flags |= CHN_F_NBIO;
1337                         else
1338                                 wrch->flags &= ~CHN_F_NBIO;
1339                         CHN_UNLOCK(wrch);
1340                 }
1341                 break;
1342
1343         /*
1344          * Finally, here is the linux-compatible ioctl interface
1345          */
1346 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1347         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1348         case SNDCTL_DSP_GETBLKSIZE:
1349                 chn = wrch ? wrch : rdch;
1350                 if (chn) {
1351                         CHN_LOCK(chn);
1352                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1353                         CHN_UNLOCK(chn);
1354                 } else {
1355                         *arg_i = 0;
1356                         ret = EINVAL;
1357                 }
1358                 break;
1359
1360         case SNDCTL_DSP_SETBLKSIZE:
1361                 RANGE(*arg_i, 16, 65536);
1362                 PCM_ACQUIRE_QUICK(d);
1363                 if (wrch) {
1364                         CHN_LOCK(wrch);
1365                         chn_setblocksize(wrch, 2, *arg_i);
1366                         CHN_UNLOCK(wrch);
1367                 }
1368                 if (rdch) {
1369                         CHN_LOCK(rdch);
1370                         chn_setblocksize(rdch, 2, *arg_i);
1371                         CHN_UNLOCK(rdch);
1372                 }
1373                 PCM_RELEASE_QUICK(d);
1374                 break;
1375
1376         case SNDCTL_DSP_RESET:
1377                 DEB(printf("dsp reset\n"));
1378                 if (wrch) {
1379                         CHN_LOCK(wrch);
1380                         chn_abort(wrch);
1381                         chn_resetbuf(wrch);
1382                         CHN_UNLOCK(wrch);
1383                 }
1384                 if (rdch) {
1385                         CHN_LOCK(rdch);
1386                         chn_abort(rdch);
1387                         chn_resetbuf(rdch);
1388                         CHN_UNLOCK(rdch);
1389                 }
1390                 break;
1391
1392         case SNDCTL_DSP_SYNC:
1393                 DEB(printf("dsp sync\n"));
1394                 /* chn_sync may sleep */
1395                 if (wrch) {
1396                         CHN_LOCK(wrch);
1397                         chn_sync(wrch, 0);
1398                         CHN_UNLOCK(wrch);
1399                 }
1400                 break;
1401
1402         case SNDCTL_DSP_SPEED:
1403                 /* chn_setspeed may sleep */
1404                 tmp = 0;
1405                 PCM_ACQUIRE_QUICK(d);
1406                 if (wrch) {
1407                         CHN_LOCK(wrch);
1408                         ret = chn_setspeed(wrch, *arg_i);
1409                         tmp = wrch->speed;
1410                         CHN_UNLOCK(wrch);
1411                 }
1412                 if (rdch && ret == 0) {
1413                         CHN_LOCK(rdch);
1414                         ret = chn_setspeed(rdch, *arg_i);
1415                         if (tmp == 0)
1416                                 tmp = rdch->speed;
1417                         CHN_UNLOCK(rdch);
1418                 }
1419                 PCM_RELEASE_QUICK(d);
1420                 *arg_i = tmp;
1421                 break;
1422
1423         case SOUND_PCM_READ_RATE:
1424                 chn = wrch ? wrch : rdch;
1425                 if (chn) {
1426                         CHN_LOCK(chn);
1427                         *arg_i = chn->speed;
1428                         CHN_UNLOCK(chn);
1429                 } else {
1430                         *arg_i = 0;
1431                         ret = EINVAL;
1432                 }
1433                 break;
1434
1435         case SNDCTL_DSP_STEREO:
1436                 tmp = -1;
1437                 *arg_i = (*arg_i)? 2 : 1;
1438                 PCM_ACQUIRE_QUICK(d);
1439                 if (wrch) {
1440                         CHN_LOCK(wrch);
1441                         ret = chn_setformat(wrch,
1442                             SND_FORMAT(wrch->format, *arg_i, 0));
1443                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1444                         CHN_UNLOCK(wrch);
1445                 }
1446                 if (rdch && ret == 0) {
1447                         CHN_LOCK(rdch);
1448                         ret = chn_setformat(rdch,
1449                             SND_FORMAT(rdch->format, *arg_i, 0));
1450                         if (tmp == -1)
1451                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1452                         CHN_UNLOCK(rdch);
1453                 }
1454                 PCM_RELEASE_QUICK(d);
1455                 *arg_i = tmp;
1456                 break;
1457
1458         case SOUND_PCM_WRITE_CHANNELS:
1459 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1460                 if (*arg_i < 0) {
1461                         *arg_i = 0;
1462                         ret = EINVAL;
1463                         break;
1464                 }
1465                 if (*arg_i != 0) {
1466                         struct pcmchan_matrix *m;
1467                         uint32_t ext;
1468
1469                         tmp = 0;
1470                         if (*arg_i > SND_CHN_MAX)
1471                                 *arg_i = SND_CHN_MAX;
1472
1473                         m = feeder_matrix_default_channel_map(*arg_i);
1474                         if (m != NULL)
1475                                 ext = m->ext;
1476                         else
1477                                 ext = 0;
1478
1479                         PCM_ACQUIRE_QUICK(d);
1480                         if (wrch) {
1481                                 CHN_LOCK(wrch);
1482                                 ret = chn_setformat(wrch,
1483                                     SND_FORMAT(wrch->format, *arg_i, ext));
1484                                 tmp = AFMT_CHANNEL(wrch->format);
1485                                 CHN_UNLOCK(wrch);
1486                         }
1487                         if (rdch && ret == 0) {
1488                                 CHN_LOCK(rdch);
1489                                 ret = chn_setformat(rdch,
1490                                     SND_FORMAT(rdch->format, *arg_i, ext));
1491                                 if (tmp == 0)
1492                                         tmp = AFMT_CHANNEL(rdch->format);
1493                                 CHN_UNLOCK(rdch);
1494                         }
1495                         PCM_RELEASE_QUICK(d);
1496                         *arg_i = tmp;
1497                 } else {
1498                         chn = wrch ? wrch : rdch;
1499                         CHN_LOCK(chn);
1500                         *arg_i = AFMT_CHANNEL(chn->format);
1501                         CHN_UNLOCK(chn);
1502                 }
1503                 break;
1504
1505         case SOUND_PCM_READ_CHANNELS:
1506                 chn = wrch ? wrch : rdch;
1507                 if (chn) {
1508                         CHN_LOCK(chn);
1509                         *arg_i = AFMT_CHANNEL(chn->format);
1510                         CHN_UNLOCK(chn);
1511                 } else {
1512                         *arg_i = 0;
1513                         ret = EINVAL;
1514                 }
1515                 break;
1516
1517         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1518                 chn = wrch ? wrch : rdch;
1519                 if (chn) {
1520                         CHN_LOCK(chn);
1521                         *arg_i = chn_getformats(chn);
1522                         CHN_UNLOCK(chn);
1523                 } else {
1524                         *arg_i = 0;
1525                         ret = EINVAL;
1526                 }
1527                 break;
1528
1529         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1530                 if (*arg_i != AFMT_QUERY) {
1531                         tmp = 0;
1532                         PCM_ACQUIRE_QUICK(d);
1533                         if (wrch) {
1534                                 CHN_LOCK(wrch);
1535                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1536                                     AFMT_CHANNEL(wrch->format),
1537                                     AFMT_EXTCHANNEL(wrch->format)));
1538                                 tmp = wrch->format;
1539                                 CHN_UNLOCK(wrch);
1540                         }
1541                         if (rdch && ret == 0) {
1542                                 CHN_LOCK(rdch);
1543                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1544                                     AFMT_CHANNEL(rdch->format),
1545                                     AFMT_EXTCHANNEL(rdch->format)));
1546                                 if (tmp == 0)
1547                                         tmp = rdch->format;
1548                                 CHN_UNLOCK(rdch);
1549                         }
1550                         PCM_RELEASE_QUICK(d);
1551                         *arg_i = AFMT_ENCODING(tmp);
1552                 } else {
1553                         chn = wrch ? wrch : rdch;
1554                         CHN_LOCK(chn);
1555                         *arg_i = AFMT_ENCODING(chn->format);
1556                         CHN_UNLOCK(chn);
1557                 }
1558                 break;
1559
1560         case SNDCTL_DSP_SETFRAGMENT:
1561                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1562                 {
1563                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1564                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1565                         uint32_t fragsz;
1566                         uint32_t r_maxfrags, r_fragsz;
1567
1568                         RANGE(fragln, 4, 16);
1569                         fragsz = 1 << fragln;
1570
1571                         if (maxfrags == 0)
1572                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1573                         if (maxfrags < 2)
1574                                 maxfrags = 2;
1575                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1576                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1577
1578                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1579                         PCM_ACQUIRE_QUICK(d);
1580                         if (rdch) {
1581                                 CHN_LOCK(rdch);
1582                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1583                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1584                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1585                                 CHN_UNLOCK(rdch);
1586                         } else {
1587                                 r_maxfrags = maxfrags;
1588                                 r_fragsz = fragsz;
1589                         }
1590                         if (wrch && ret == 0) {
1591                                 CHN_LOCK(wrch);
1592                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1593                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1594                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1595                                 CHN_UNLOCK(wrch);
1596                         } else { /* use whatever came from the read channel */
1597                                 maxfrags = r_maxfrags;
1598                                 fragsz = r_fragsz;
1599                         }
1600                         PCM_RELEASE_QUICK(d);
1601
1602                         fragln = 0;
1603                         while (fragsz > 1) {
1604                                 fragln++;
1605                                 fragsz >>= 1;
1606                         }
1607                         *arg_i = (maxfrags << 16) | fragln;
1608                 }
1609                 break;
1610
1611         case SNDCTL_DSP_GETISPACE:
1612                 /* return the size of data available in the input queue */
1613                 {
1614                         audio_buf_info *a = (audio_buf_info *)arg;
1615                         if (rdch) {
1616                                 struct snd_dbuf *bs = rdch->bufsoft;
1617
1618                                 CHN_LOCK(rdch);
1619                                 a->bytes = sndbuf_getready(bs);
1620                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1621                                 a->fragstotal = sndbuf_getblkcnt(bs);
1622                                 a->fragsize = sndbuf_getblksz(bs);
1623                                 CHN_UNLOCK(rdch);
1624                         } else
1625                                 ret = EINVAL;
1626                 }
1627                 break;
1628
1629         case SNDCTL_DSP_GETOSPACE:
1630                 /* return space available in the output queue */
1631                 {
1632                         audio_buf_info *a = (audio_buf_info *)arg;
1633                         if (wrch) {
1634                                 struct snd_dbuf *bs = wrch->bufsoft;
1635
1636                                 CHN_LOCK(wrch);
1637                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1638                                 a->bytes = sndbuf_getfree(bs);
1639                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1640                                 a->fragstotal = sndbuf_getblkcnt(bs);
1641                                 a->fragsize = sndbuf_getblksz(bs);
1642                                 CHN_UNLOCK(wrch);
1643                         } else
1644                                 ret = EINVAL;
1645                 }
1646                 break;
1647
1648         case SNDCTL_DSP_GETIPTR:
1649                 {
1650                         count_info *a = (count_info *)arg;
1651                         if (rdch) {
1652                                 struct snd_dbuf *bs = rdch->bufsoft;
1653
1654                                 CHN_LOCK(rdch);
1655                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1656                                 a->bytes = sndbuf_gettotal(bs);
1657                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1658                                 a->ptr = sndbuf_getreadyptr(bs);
1659                                 rdch->blocks = sndbuf_getblocks(bs);
1660                                 CHN_UNLOCK(rdch);
1661                         } else
1662                                 ret = EINVAL;
1663                 }
1664                 break;
1665
1666         case SNDCTL_DSP_GETOPTR:
1667                 {
1668                         count_info *a = (count_info *)arg;
1669                         if (wrch) {
1670                                 struct snd_dbuf *bs = wrch->bufsoft;
1671
1672                                 CHN_LOCK(wrch);
1673                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1674                                 a->bytes = sndbuf_gettotal(bs);
1675                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1676                                 a->ptr = sndbuf_getreadyptr(bs);
1677                                 wrch->blocks = sndbuf_getblocks(bs);
1678                                 CHN_UNLOCK(wrch);
1679                         } else
1680                                 ret = EINVAL;
1681                 }
1682                 break;
1683
1684         case SNDCTL_DSP_GETCAPS:
1685                 PCM_LOCK(d);
1686                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1687                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1688                         *arg_i |= PCM_CAP_DUPLEX;
1689                 PCM_UNLOCK(d);
1690                 break;
1691
1692         case SOUND_PCM_READ_BITS:
1693                 chn = wrch ? wrch : rdch;
1694                 if (chn) {
1695                         CHN_LOCK(chn);
1696                         if (chn->format & AFMT_8BIT)
1697                                 *arg_i = 8;
1698                         else if (chn->format & AFMT_16BIT)
1699                                 *arg_i = 16;
1700                         else if (chn->format & AFMT_24BIT)
1701                                 *arg_i = 24;
1702                         else if (chn->format & AFMT_32BIT)
1703                                 *arg_i = 32;
1704                         else
1705                                 ret = EINVAL;
1706                         CHN_UNLOCK(chn);
1707                 } else {
1708                         *arg_i = 0;
1709                         ret = EINVAL;
1710                 }
1711                 break;
1712
1713         case SNDCTL_DSP_SETTRIGGER:
1714                 if (rdch) {
1715                         CHN_LOCK(rdch);
1716                         rdch->flags &= ~CHN_F_NOTRIGGER;
1717                         if (*arg_i & PCM_ENABLE_INPUT)
1718                                 chn_start(rdch, 1);
1719                         else {
1720                                 chn_abort(rdch);
1721                                 chn_resetbuf(rdch);
1722                                 rdch->flags |= CHN_F_NOTRIGGER;
1723                         }
1724                         CHN_UNLOCK(rdch);
1725                 }
1726                 if (wrch) {
1727                         CHN_LOCK(wrch);
1728                         wrch->flags &= ~CHN_F_NOTRIGGER;
1729                         if (*arg_i & PCM_ENABLE_OUTPUT)
1730                                 chn_start(wrch, 1);
1731                         else {
1732                                 chn_abort(wrch);
1733                                 chn_resetbuf(wrch);
1734                                 wrch->flags |= CHN_F_NOTRIGGER;
1735                         }
1736                         CHN_UNLOCK(wrch);
1737                 }
1738                 break;
1739
1740         case SNDCTL_DSP_GETTRIGGER:
1741                 *arg_i = 0;
1742                 if (wrch) {
1743                         CHN_LOCK(wrch);
1744                         if (wrch->flags & CHN_F_TRIGGERED)
1745                                 *arg_i |= PCM_ENABLE_OUTPUT;
1746                         CHN_UNLOCK(wrch);
1747                 }
1748                 if (rdch) {
1749                         CHN_LOCK(rdch);
1750                         if (rdch->flags & CHN_F_TRIGGERED)
1751                                 *arg_i |= PCM_ENABLE_INPUT;
1752                         CHN_UNLOCK(rdch);
1753                 }
1754                 break;
1755
1756         case SNDCTL_DSP_GETODELAY:
1757                 if (wrch) {
1758                         struct snd_dbuf *bs = wrch->bufsoft;
1759
1760                         CHN_LOCK(wrch);
1761                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1762                         *arg_i = sndbuf_getready(bs);
1763                         CHN_UNLOCK(wrch);
1764                 } else
1765                         ret = EINVAL;
1766                 break;
1767
1768         case SNDCTL_DSP_POST:
1769                 if (wrch) {
1770                         CHN_LOCK(wrch);
1771                         wrch->flags &= ~CHN_F_NOTRIGGER;
1772                         chn_start(wrch, 1);
1773                         CHN_UNLOCK(wrch);
1774                 }
1775                 break;
1776
1777         case SNDCTL_DSP_SETDUPLEX:
1778                 /*
1779                  * switch to full-duplex mode if card is in half-duplex
1780                  * mode and is able to work in full-duplex mode
1781                  */
1782                 PCM_LOCK(d);
1783                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1784                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1785                 PCM_UNLOCK(d);
1786                 break;
1787
1788         /*
1789          * The following four ioctls are simple wrappers around mixer_ioctl
1790          * with no further processing.  xcmd is short for "translated
1791          * command".
1792          */
1793         case SNDCTL_DSP_GETRECVOL:
1794                 if (xcmd == 0) {
1795                         xcmd = SOUND_MIXER_READ_RECLEV;
1796                         chn = rdch;
1797                 }
1798                 /* FALLTHROUGH */
1799         case SNDCTL_DSP_SETRECVOL:
1800                 if (xcmd == 0) {
1801                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1802                         chn = rdch;
1803                 }
1804                 /* FALLTHROUGH */
1805         case SNDCTL_DSP_GETPLAYVOL:
1806                 if (xcmd == 0) {
1807                         xcmd = SOUND_MIXER_READ_PCM;
1808                         chn = wrch;
1809                 }
1810                 /* FALLTHROUGH */
1811         case SNDCTL_DSP_SETPLAYVOL:
1812                 if (xcmd == 0) {
1813                         xcmd = SOUND_MIXER_WRITE_PCM;
1814                         chn = wrch;
1815                 }
1816
1817                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1818                 if (ret != -1) {
1819                         PCM_GIANT_EXIT(d);
1820                         return (ret);
1821                 }
1822
1823                 if (d->mixer_dev != NULL) {
1824                         PCM_ACQUIRE_QUICK(d);
1825                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1826                             MIXER_CMD_DIRECT);
1827                         PCM_RELEASE_QUICK(d);
1828                 } else
1829                         ret = ENOTSUP;
1830
1831                 break;
1832
1833         case SNDCTL_DSP_GET_RECSRC_NAMES:
1834         case SNDCTL_DSP_GET_RECSRC:
1835         case SNDCTL_DSP_SET_RECSRC:
1836                 if (d->mixer_dev != NULL) {
1837                         PCM_ACQUIRE_QUICK(d);
1838                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1839                             MIXER_CMD_DIRECT);
1840                         PCM_RELEASE_QUICK(d);
1841                 } else
1842                         ret = ENOTSUP;
1843                 break;
1844
1845         /*
1846          * The following 3 ioctls aren't very useful at the moment.  For
1847          * now, only a single channel is associated with a cdev (/dev/dspN
1848          * instance), so there's only a single output routing to use (i.e.,
1849          * the wrch bound to this cdev).
1850          */
1851         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1852                 {
1853                         oss_mixer_enuminfo *ei;
1854                         ei = (oss_mixer_enuminfo *)arg;
1855                         ei->dev = 0;
1856                         ei->ctrl = 0;
1857                         ei->version = 0; /* static for now */
1858                         ei->strindex[0] = 0;
1859
1860                         if (wrch != NULL) {
1861                                 ei->nvalues = 1;
1862                                 strlcpy(ei->strings, wrch->name,
1863                                         sizeof(ei->strings));
1864                         } else {
1865                                 ei->nvalues = 0;
1866                                 ei->strings[0] = '\0';
1867                         }
1868                 }
1869                 break;
1870         case SNDCTL_DSP_GET_PLAYTGT:
1871         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1872                 /*
1873                  * Re: SET_PLAYTGT
1874                  *   OSSv4: "The value that was accepted by the device will
1875                  *   be returned back in the variable pointed by the
1876                  *   argument."
1877                  */
1878                 if (wrch != NULL)
1879                         *arg_i = 0;
1880                 else
1881                         ret = EINVAL;
1882                 break;
1883
1884         case SNDCTL_DSP_SILENCE:
1885         /*
1886          * Flush the software (pre-feed) buffer, but try to minimize playback
1887          * interruption.  (I.e., record unplayed samples with intent to
1888          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1889          * functionality.
1890          */
1891                 if (wrch == NULL)
1892                         ret = EINVAL;
1893                 else {
1894                         struct snd_dbuf *bs;
1895                         CHN_LOCK(wrch);
1896                         while (wrch->inprog != 0)
1897                                 cv_wait(&wrch->cv, wrch->lock);
1898                         bs = wrch->bufsoft;
1899                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1900                                 bs->sl = sndbuf_getready(bs);
1901                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1902                                 sndbuf_fillsilence(bs);
1903                                 chn_start(wrch, 0);
1904                         }
1905                         CHN_UNLOCK(wrch);
1906                 }
1907                 break;
1908
1909         case SNDCTL_DSP_SKIP:
1910         /*
1911          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1912          * playback buffer by moving the current write position immediately
1913          * before the point where the device is currently reading the samples."
1914          */
1915                 if (wrch == NULL)
1916                         ret = EINVAL;
1917                 else {
1918                         struct snd_dbuf *bs;
1919                         CHN_LOCK(wrch);
1920                         while (wrch->inprog != 0)
1921                                 cv_wait(&wrch->cv, wrch->lock);
1922                         bs = wrch->bufsoft;
1923                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1924                                 sndbuf_softreset(bs);
1925                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1926                                 bs->sl = 0;
1927                                 chn_start(wrch, 0);
1928                         }
1929                         CHN_UNLOCK(wrch);
1930                 }
1931                 break;
1932
1933         case SNDCTL_DSP_CURRENT_OPTR:
1934         case SNDCTL_DSP_CURRENT_IPTR:
1935         /**
1936          * @note Changing formats resets the buffer counters, which differs
1937          *       from the 4Front drivers.  However, I don't expect this to be
1938          *       much of a problem.
1939          *
1940          * @note In a test where @c CURRENT_OPTR is called immediately after write
1941          *       returns, this driver is about 32K samples behind whereas
1942          *       4Front's is about 8K samples behind.  Should determine source
1943          *       of discrepancy, even if only out of curiosity.
1944          *
1945          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1946          */
1947                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1948                 if (chn == NULL)
1949                         ret = EINVAL;
1950                 else {
1951                         struct snd_dbuf *bs;
1952                         /* int tmp; */
1953
1954                         oss_count_t *oc = (oss_count_t *)arg;
1955
1956                         CHN_LOCK(chn);
1957                         bs = chn->bufsoft;
1958 #if 0
1959                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1960                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1961                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1962 #else
1963                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1964                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1965 #endif
1966                         CHN_UNLOCK(chn);
1967                 }
1968                 break;
1969
1970         case SNDCTL_DSP_HALT_OUTPUT:
1971         case SNDCTL_DSP_HALT_INPUT:
1972                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1973                 if (chn == NULL)
1974                         ret = EINVAL;
1975                 else {
1976                         CHN_LOCK(chn);
1977                         chn_abort(chn);
1978                         CHN_UNLOCK(chn);
1979                 }
1980                 break;
1981
1982         case SNDCTL_DSP_LOW_WATER:
1983         /*
1984          * Set the number of bytes required to attract attention by
1985          * select/poll.
1986          */
1987                 if (wrch != NULL) {
1988                         CHN_LOCK(wrch);
1989                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
1990                         CHN_UNLOCK(wrch);
1991                 }
1992                 if (rdch != NULL) {
1993                         CHN_LOCK(rdch);
1994                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
1995                         CHN_UNLOCK(rdch);
1996                 }
1997                 break;
1998
1999         case SNDCTL_DSP_GETERROR:
2000         /*
2001          * OSSv4 docs:  "All errors and counters will automatically be
2002          * cleared to zeroes after the call so each call will return only
2003          * the errors that occurred after the previous invocation. ... The
2004          * play_underruns and rec_overrun fields are the only usefull fields
2005          * returned by OSS 4.0."
2006          */
2007                 {
2008                         audio_errinfo *ei = (audio_errinfo *)arg;
2009
2010                         bzero((void *)ei, sizeof(*ei));
2011
2012                         if (wrch != NULL) {
2013                                 CHN_LOCK(wrch);
2014                                 ei->play_underruns = wrch->xruns;
2015                                 wrch->xruns = 0;
2016                                 CHN_UNLOCK(wrch);
2017                         }
2018                         if (rdch != NULL) {
2019                                 CHN_LOCK(rdch);
2020                                 ei->rec_overruns = rdch->xruns;
2021                                 rdch->xruns = 0;
2022                                 CHN_UNLOCK(rdch);
2023                         }
2024                 }
2025                 break;
2026
2027         case SNDCTL_DSP_SYNCGROUP:
2028                 PCM_ACQUIRE_QUICK(d);
2029                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2030                 PCM_RELEASE_QUICK(d);
2031                 break;
2032
2033         case SNDCTL_DSP_SYNCSTART:
2034                 PCM_ACQUIRE_QUICK(d);
2035                 ret = dsp_oss_syncstart(*arg_i);
2036                 PCM_RELEASE_QUICK(d);
2037                 break;
2038
2039         case SNDCTL_DSP_POLICY:
2040                 PCM_ACQUIRE_QUICK(d);
2041                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2042                 PCM_RELEASE_QUICK(d);
2043                 break;
2044
2045         case SNDCTL_DSP_COOKEDMODE:
2046                 PCM_ACQUIRE_QUICK(d);
2047                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2048                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2049                 PCM_RELEASE_QUICK(d);
2050                 break;
2051         case SNDCTL_DSP_GET_CHNORDER:
2052                 PCM_ACQUIRE_QUICK(d);
2053                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2054                 PCM_RELEASE_QUICK(d);
2055                 break;
2056         case SNDCTL_DSP_SET_CHNORDER:
2057                 PCM_ACQUIRE_QUICK(d);
2058                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2059                 PCM_RELEASE_QUICK(d);
2060                 break;
2061         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2062                 PCM_ACQUIRE_QUICK(d);
2063                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2064                 PCM_RELEASE_QUICK(d);
2065                 break;
2066         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2067                 ret = EINVAL;
2068                 break;
2069 #ifdef  OSSV4_EXPERIMENT
2070         /*
2071          * XXX The following ioctls are not yet supported and just return
2072          * EINVAL.
2073          */
2074         case SNDCTL_DSP_GETOPEAKS:
2075         case SNDCTL_DSP_GETIPEAKS:
2076                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2077                 if (chn == NULL)
2078                         ret = EINVAL;
2079                 else {
2080                         oss_peaks_t *op = (oss_peaks_t *)arg;
2081                         int lpeak, rpeak;
2082
2083                         CHN_LOCK(chn);
2084                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2085                         if (ret == -1)
2086                                 ret = EINVAL;
2087                         else {
2088                                 (*op)[0] = lpeak;
2089                                 (*op)[1] = rpeak;
2090                         }
2091                         CHN_UNLOCK(chn);
2092                 }
2093                 break;
2094
2095         /*
2096          * XXX Once implemented, revisit this for proper cv protection
2097          *     (if necessary).
2098          */
2099         case SNDCTL_GETLABEL:
2100                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2101                 break;
2102         case SNDCTL_SETLABEL:
2103                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2104                 break;
2105         case SNDCTL_GETSONG:
2106                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2107                 break;
2108         case SNDCTL_SETSONG:
2109                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2110                 break;
2111         case SNDCTL_SETNAME:
2112                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2113                 break;
2114 #if 0
2115         /**
2116          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2117          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2118          * 4Front Technologies.
2119          */
2120         case SNDCTL_DSP_READCTL:
2121         case SNDCTL_DSP_WRITECTL:
2122                 ret = EINVAL;
2123                 break;
2124 #endif  /* !0 (explicitly omitted ioctls) */
2125
2126 #endif  /* !OSSV4_EXPERIMENT */
2127         case SNDCTL_DSP_MAPINBUF:
2128         case SNDCTL_DSP_MAPOUTBUF:
2129         case SNDCTL_DSP_SETSYNCRO:
2130                 /* undocumented */
2131
2132         case SNDCTL_DSP_SUBDIVIDE:
2133         case SOUND_PCM_WRITE_FILTER:
2134         case SOUND_PCM_READ_FILTER:
2135                 /* dunno what these do, don't sound important */
2136
2137         default:
2138                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2139                 ret = EINVAL;
2140                 break;
2141         }
2142
2143         PCM_GIANT_LEAVE(d);
2144
2145         return (ret);
2146 }
2147
2148 static int
2149 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2150 {
2151         struct snddev_info *d;
2152         struct pcm_channel *wrch, *rdch;
2153         int ret, e;
2154
2155         d = dsp_get_info(i_dev);
2156         if (!DSP_REGISTERED(d, i_dev))
2157                 return (EBADF);
2158
2159         PCM_GIANT_ENTER(d);
2160
2161         wrch = NULL;
2162         rdch = NULL;
2163         ret = 0;
2164
2165         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2166
2167         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2168                 e = (events & (POLLOUT | POLLWRNORM));
2169                 if (e)
2170                         ret |= chn_poll(wrch, e, td);
2171         }
2172
2173         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2174                 e = (events & (POLLIN | POLLRDNORM));
2175                 if (e)
2176                         ret |= chn_poll(rdch, e, td);
2177         }
2178
2179         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2180
2181         PCM_GIANT_LEAVE(d);
2182
2183         return (ret);
2184 }
2185
2186 static int
2187 dsp_mmap(struct cdev *i_dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
2188 {
2189         struct snddev_info *d;
2190         struct pcm_channel *wrch, *rdch, *c;
2191
2192         /*
2193          * Reject PROT_EXEC by default. It just doesn't makes sense.
2194          * Unfortunately, we have to give up this one due to linux_mmap
2195          * changes.
2196          *
2197          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2198          *
2199          */
2200 #ifdef SV_ABI_LINUX
2201         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2202             (dsp_mmap_allow_prot_exec == 0 &&
2203             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2204 #else
2205         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2206 #endif
2207                 return (-1);
2208
2209         d = dsp_get_info(i_dev);
2210         if (!DSP_REGISTERED(d, i_dev))
2211                 return (-1);
2212
2213         PCM_GIANT_ENTER(d);
2214
2215         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2216
2217         /*
2218          * XXX The linux api uses the nprot to select read/write buffer
2219          *     our vm system doesn't allow this, so force write buffer.
2220          *
2221          *     This is just a quack to fool full-duplex mmap, so that at
2222          *     least playback _or_ recording works. If you really got the
2223          *     urge to make _both_ work at the same time, avoid O_RDWR.
2224          *     Just open each direction separately and mmap() it.
2225          *
2226          *     Failure is not an option due to INVARIANTS check within
2227          *     device_pager.c, which means, we have to give up one over
2228          *     another.
2229          */
2230         c = (wrch != NULL) ? wrch : rdch;
2231
2232         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2233             offset >= sndbuf_getsize(c->bufsoft) ||
2234             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2235             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2236                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2237                 PCM_GIANT_EXIT(d);
2238                 return (-1);
2239         }
2240
2241         /* XXX full-duplex quack. */
2242         if (wrch != NULL)
2243                 wrch->flags |= CHN_F_MMAP;
2244         if (rdch != NULL)
2245                 rdch->flags |= CHN_F_MMAP;
2246
2247         *paddr = vtophys(sndbuf_getbufofs(c->bufsoft, offset));
2248         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2249
2250         PCM_GIANT_LEAVE(d);
2251
2252         return (0);
2253 }
2254
2255 /* So much for dev_stdclone() */
2256 static int
2257 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2258 {
2259         size_t len;
2260
2261         len = strlen(namep);
2262
2263         if (bcmp(name, namep, len) != 0)
2264                 return (ENODEV);
2265
2266         name += len;
2267
2268         if (isdigit(*name) == 0)
2269                 return (ENODEV);
2270
2271         len = strlen(sep);
2272
2273         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2274                 return (ENODEV);
2275
2276         for (*u = 0; isdigit(*name) != 0; name++) {
2277                 *u *= 10;
2278                 *u += *name - '0';
2279                 if (*u > dsp_umax)
2280                         return (ENODEV);
2281         }
2282
2283         if (*name == '\0')
2284                 return ((use_sep == 0) ? 0 : ENODEV);
2285
2286         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2287                 return (ENODEV);
2288
2289         name += len;
2290
2291         if (*name == '0' && name[1] != '\0')
2292                 return (ENODEV);
2293
2294         for (*c = 0; isdigit(*name) != 0; name++) {
2295                 *c *= 10;
2296                 *c += *name - '0';
2297                 if (*c > dsp_cmax)
2298                         return (ENODEV);
2299         }
2300
2301         if (*name != '\0')
2302                 return (ENODEV);
2303
2304         return (0);
2305 }
2306
2307 static void
2308 dsp_clone(void *arg,
2309 #if __FreeBSD_version >= 600034
2310     struct ucred *cred,
2311 #endif
2312     char *name, int namelen, struct cdev **dev)
2313 {
2314         struct snddev_info *d;
2315         struct snd_clone_entry *ce;
2316         struct pcm_channel *c;
2317         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2318         char *devname, *devcmp, *devsep;
2319
2320         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2321
2322         if (*dev != NULL)
2323                 return;
2324
2325         unit = -1;
2326         cunit = -1;
2327         devtype = -1;
2328         devhw = 0;
2329         devcmax = -1;
2330         tumax = -1;
2331         devname = NULL;
2332         devsep = NULL;
2333
2334         for (i = 0; unit == -1 &&
2335             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2336                 devtype = dsp_cdevs[i].type;
2337                 devcmp = dsp_cdevs[i].name;
2338                 devsep = dsp_cdevs[i].sep;
2339                 devname = dsp_cdevs[i].alias;
2340                 if (devname == NULL)
2341                         devname = devcmp;
2342                 devhw = dsp_cdevs[i].hw;
2343                 devcmax = dsp_cdevs[i].max - 1;
2344                 if (strcmp(name, devcmp) == 0)
2345                         unit = snd_unit;
2346                 else if (dsp_stdclone(name, devcmp, devsep,
2347                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2348                         unit = -1;
2349                         cunit = -1;
2350                 }
2351         }
2352
2353         d = devclass_get_softc(pcm_devclass, unit);
2354         if (!PCM_REGISTERED(d) || d->clones == NULL)
2355                 return;
2356
2357         /* XXX Need Giant magic entry ??? */
2358
2359         PCM_LOCK(d);
2360         if (snd_clone_disabled(d->clones)) {
2361                 PCM_UNLOCK(d);
2362                 return;
2363         }
2364
2365         PCM_WAIT(d);
2366         PCM_ACQUIRE(d);
2367         PCM_UNLOCK(d);
2368
2369         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2370
2371         if (devhw != 0) {
2372                 KASSERT(devcmax <= dsp_cmax,
2373                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2374                 if (cunit > devcmax) {
2375                         PCM_RELEASE_QUICK(d);
2376                         return;
2377                 }
2378                 udcmask |= snd_c2unit(cunit);
2379                 CHN_FOREACH(c, d, channels.pcm) {
2380                         CHN_LOCK(c);
2381                         if (c->unit != udcmask) {
2382                                 CHN_UNLOCK(c);
2383                                 continue;
2384                         }
2385                         CHN_UNLOCK(c);
2386                         udcmask &= ~snd_c2unit(cunit);
2387                         /*
2388                          * Temporarily increase clone maxunit to overcome
2389                          * vchan flexibility.
2390                          *
2391                          * # sysctl dev.pcm.0.play.vchans=256
2392                          * dev.pcm.0.play.vchans: 1 -> 256
2393                          * # cat /dev/zero > /dev/dsp0.vp255 &
2394                          * [1] 17296
2395                          * # sysctl dev.pcm.0.play.vchans=0
2396                          * dev.pcm.0.play.vchans: 256 -> 1
2397                          * # fg
2398                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2399                          * ^C
2400                          * # cat /dev/zero > /dev/dsp0.vp255
2401                          * zsh: operation not supported: /dev/dsp0.vp255
2402                          */
2403                         tumax = snd_clone_getmaxunit(d->clones);
2404                         if (cunit > tumax)
2405                                 snd_clone_setmaxunit(d->clones, cunit);
2406                         else
2407                                 tumax = -1;
2408                         goto dsp_clone_alloc;
2409                 }
2410                 /*
2411                  * Ok, so we're requesting unallocated vchan, but still
2412                  * within maximum vchan limit.
2413                  */
2414                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2415                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2416                     cunit < snd_maxautovchans) {
2417                         udcmask &= ~snd_c2unit(cunit);
2418                         tumax = snd_clone_getmaxunit(d->clones);
2419                         if (cunit > tumax)
2420                                 snd_clone_setmaxunit(d->clones, cunit);
2421                         else
2422                                 tumax = -1;
2423                         goto dsp_clone_alloc;
2424                 }
2425                 PCM_RELEASE_QUICK(d);
2426                 return;
2427         }
2428
2429 dsp_clone_alloc:
2430         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2431         if (tumax != -1)
2432                 snd_clone_setmaxunit(d->clones, tumax);
2433         if (ce != NULL) {
2434                 udcmask |= snd_c2unit(cunit);
2435                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2436                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2437                     devname, unit, devsep, cunit);
2438                 snd_clone_register(ce, *dev);
2439         }
2440
2441         PCM_RELEASE_QUICK(d);
2442
2443         if (*dev != NULL)
2444                 dev_ref(*dev);
2445 }
2446
2447 static void
2448 dsp_sysinit(void *p)
2449 {
2450         if (dsp_ehtag != NULL)
2451                 return;
2452         /* initialize unit numbering */
2453         snd_unit_init();
2454         dsp_umax = PCMMAXUNIT;
2455         dsp_cmax = PCMMAXCHAN;
2456         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2457 }
2458
2459 static void
2460 dsp_sysuninit(void *p)
2461 {
2462         if (dsp_ehtag == NULL)
2463                 return;
2464         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2465         dsp_ehtag = NULL;
2466 }
2467
2468 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2469 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2470
2471 char *
2472 dsp_unit2name(char *buf, size_t len, int unit)
2473 {
2474         int i, dtype;
2475
2476         KASSERT(buf != NULL && len != 0,
2477             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2478
2479         dtype = snd_unit2d(unit);
2480
2481         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2482                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2483                         continue;
2484                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2485                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2486                 return (buf);
2487         }
2488
2489         return (NULL);
2490 }
2491
2492 /**
2493  * @brief Handler for SNDCTL_AUDIOINFO.
2494  *
2495  * Gathers information about the audio device specified in ai->dev.  If
2496  * ai->dev == -1, then this function gathers information about the current
2497  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2498  * return EINVAL.
2499  *
2500  * This routine is supposed to go practically straight to the hardware,
2501  * getting capabilities directly from the sound card driver, side-stepping
2502  * the intermediate channel interface.
2503  *
2504  * Note, however, that the usefulness of this command is significantly
2505  * decreased when requesting info about any device other than the one serving
2506  * the request. While each snddev_channel refers to a specific device node,
2507  * the converse is *not* true.  Currently, when a sound device node is opened,
2508  * the sound subsystem scans for an available audio channel (or channels, if
2509  * opened in read+write) and then assigns them to the si_drv[12] private
2510  * data fields.  As a result, any information returned linking a channel to
2511  * a specific character device isn't necessarily accurate.
2512  *
2513  * @note
2514  * Calling threads must not hold any snddev_info or pcm_channel locks.
2515  *
2516  * @param dev           device on which the ioctl was issued
2517  * @param ai            ioctl request data container
2518  *
2519  * @retval 0            success
2520  * @retval EINVAL       ai->dev specifies an invalid device
2521  *
2522  * @todo Verify correctness of Doxygen tags.  ;)
2523  */
2524 int
2525 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2526 {
2527         struct pcmchan_caps *caps;
2528         struct pcm_channel *ch;
2529         struct snddev_info *d;
2530         uint32_t fmts;
2531         int i, nchan, *rates, minch, maxch;
2532         char *devname, buf[CHN_NAMELEN];
2533
2534         /*
2535          * If probing the device that received the ioctl, make sure it's a
2536          * DSP device.  (Users may use this ioctl with /dev/mixer and
2537          * /dev/midi.)
2538          */
2539         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2540                 return (EINVAL);
2541
2542         ch = NULL;
2543         devname = NULL;
2544         nchan = 0;
2545         bzero(buf, sizeof(buf));
2546
2547         /*
2548          * Search for the requested audio device (channel).  Start by
2549          * iterating over pcm devices.
2550          */
2551         for (i = 0; pcm_devclass != NULL &&
2552             i < devclass_get_maxunit(pcm_devclass); i++) {
2553                 d = devclass_get_softc(pcm_devclass, i);
2554                 if (!PCM_REGISTERED(d))
2555                         continue;
2556
2557                 /* XXX Need Giant magic entry ??? */
2558
2559                 /* See the note in function docblock */
2560                 PCM_UNLOCKASSERT(d);
2561                 PCM_LOCK(d);
2562
2563                 CHN_FOREACH(ch, d, channels.pcm) {
2564                         CHN_UNLOCKASSERT(ch);
2565                         CHN_LOCK(ch);
2566                         if (ai->dev == -1) {
2567                                 if (DSP_REGISTERED(d, i_dev) &&
2568                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2569                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2570                                         devname = dsp_unit2name(buf,
2571                                             sizeof(buf), ch->unit);
2572                                 }
2573                         } else if (ai->dev == nchan) {
2574                                 devname = dsp_unit2name(buf, sizeof(buf),
2575                                     ch->unit);
2576                         }
2577                         if (devname != NULL)
2578                                 break;
2579                         CHN_UNLOCK(ch);
2580                         ++nchan;
2581                 }
2582
2583                 if (devname != NULL) {
2584                         /*
2585                          * At this point, the following synchronization stuff
2586                          * has happened:
2587                          * - a specific PCM device is locked.
2588                          * - a specific audio channel has been locked, so be
2589                          *   sure to unlock when exiting;
2590                          */
2591
2592                         caps = chn_getcaps(ch);
2593
2594                         /*
2595                          * With all handles collected, zero out the user's
2596                          * container and begin filling in its fields.
2597                          */
2598                         bzero((void *)ai, sizeof(oss_audioinfo));
2599
2600                         ai->dev = nchan;
2601                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2602
2603                         if ((ch->flags & CHN_F_BUSY) == 0)
2604                                 ai->busy = 0;
2605                         else
2606                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2607
2608                         /**
2609                          * @note
2610                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2611                          *    this moment." Cop-out, I know, but I'll save
2612                          *    running around in the process table for later.
2613                          *    Is there a risk of leaking information?
2614                          */
2615                         ai->pid = ch->pid;
2616
2617                         /*
2618                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2619                          * Note, however, that a single channel operates in
2620                          * only one direction, so PCM_CAP_DUPLEX is out.
2621                          */
2622                         /**
2623                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2624                          *       these in pcmchan::caps?
2625                          */
2626                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2627                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2628
2629                         /*
2630                          * Collect formats supported @b natively by the
2631                          * device.  Also determine min/max channels.  (I.e.,
2632                          * mono, stereo, or both?)
2633                          *
2634                          * If any channel is stereo, maxch = 2;
2635                          * if all channels are stereo, minch = 2, too;
2636                          * if any channel is mono, minch = 1;
2637                          * and if all channels are mono, maxch = 1.
2638                          */
2639                         minch = 0;
2640                         maxch = 0;
2641                         fmts = 0;
2642                         for (i = 0; caps->fmtlist[i]; i++) {
2643                                 fmts |= caps->fmtlist[i];
2644                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2645                                         minch = (minch == 0) ? 2 : minch;
2646                                         maxch = 2;
2647                                 } else {
2648                                         minch = 1;
2649                                         maxch = (maxch == 0) ? 1 : maxch;
2650                                 }
2651                         }
2652
2653                         if (ch->direction == PCMDIR_PLAY)
2654                                 ai->oformats = fmts;
2655                         else
2656                                 ai->iformats = fmts;
2657
2658                         /**
2659                          * @note
2660                          * @c magic - OSSv4 docs: "Reserved for internal use
2661                          *    by OSS."
2662                          *
2663                          * @par
2664                          * @c card_number - OSSv4 docs: "Number of the sound
2665                          *    card where this device belongs or -1 if this
2666                          *    information is not available.  Applications
2667                          *    should normally not use this field for any
2668                          *    purpose."
2669                          */
2670                         ai->card_number = -1;
2671                         /**
2672                          * @todo @c song_name - depends first on
2673                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2674                          *          on SNDCTL_[GS]ETLABEL
2675                          * @todo @c port_number - routing information?
2676                          */
2677                         ai->port_number = -1;
2678                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2679                         /**
2680                          * @note
2681                          * @c real_device - OSSv4 docs:  "Obsolete."
2682                          */
2683                         ai->real_device = -1;
2684                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2685                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2686                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2687                         /**
2688                          * @note
2689                          * @c flags - OSSv4 docs: "Reserved for future use."
2690                          *
2691                          * @note
2692                          * @c binding - OSSv4 docs: "Reserved for future use."
2693                          *
2694                          * @todo @c handle - haven't decided how to generate
2695                          *       this yet; bus, vendor, device IDs?
2696                          */
2697                         ai->min_rate = caps->minspeed;
2698                         ai->max_rate = caps->maxspeed;
2699
2700                         ai->min_channels = minch;
2701                         ai->max_channels = maxch;
2702
2703                         ai->nrates = chn_getrates(ch, &rates);
2704                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2705                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2706
2707                         for (i = 0; i < ai->nrates; i++)
2708                                 ai->rates[i] = rates[i];
2709
2710                         ai->next_play_engine = 0;
2711                         ai->next_rec_engine = 0;
2712
2713                         CHN_UNLOCK(ch);
2714                 }
2715
2716                 PCM_UNLOCK(d);
2717
2718                 if (devname != NULL)
2719                         return (0);
2720         }
2721
2722         /* Exhausted the search -- nothing is locked, so return. */
2723         return (EINVAL);
2724 }
2725
2726 /**
2727  * @brief Assigns a PCM channel to a sync group.
2728  *
2729  * Sync groups are used to enable audio operations on multiple devices
2730  * simultaneously.  They may be used with any number of devices and may
2731  * span across applications.  Devices are added to groups with
2732  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2733  * SNDCTL_DSP_SYNCSTART ioctl.
2734  *
2735  * If the @c id field of the @c group parameter is set to zero, then a new
2736  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2737  * the group specified.
2738  *
2739  * @todo As far as memory allocation, should we assume that things are
2740  *       okay and allocate with M_WAITOK before acquiring channel locks,
2741  *       freeing later if not?
2742  *
2743  * @param wrch  output channel associated w/ device (if any)
2744  * @param rdch  input channel associated w/ device (if any)
2745  * @param group Sync group parameters
2746  *
2747  * @retval 0            success
2748  * @retval non-zero     error to be propagated upstream
2749  */
2750 static int
2751 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2752 {
2753         struct pcmchan_syncmember *smrd, *smwr;
2754         struct pcmchan_syncgroup *sg;
2755         int ret, sg_ids[3];
2756
2757         smrd = NULL;
2758         smwr = NULL;
2759         sg = NULL;
2760         ret = 0;
2761
2762         /*
2763          * Free_unr() may sleep, so store released syncgroup IDs until after
2764          * all locks are released.
2765          */
2766         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2767
2768         PCM_SG_LOCK();
2769
2770         /*
2771          * - Insert channel(s) into group's member list.
2772          * - Set CHN_F_NOTRIGGER on channel(s).
2773          * - Stop channel(s).
2774          */
2775
2776         /*
2777          * If device's channels are already mapped to a group, unmap them.
2778          */
2779         if (wrch) {
2780                 CHN_LOCK(wrch);
2781                 sg_ids[0] = chn_syncdestroy(wrch);
2782         }
2783
2784         if (rdch) {
2785                 CHN_LOCK(rdch);
2786                 sg_ids[1] = chn_syncdestroy(rdch);
2787         }
2788
2789         /*
2790          * Verify that mode matches character device properites.
2791          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2792          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2793          */
2794         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2795             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2796                 ret = EINVAL;
2797                 goto out;
2798         }
2799
2800         /*
2801          * An id of zero indicates the user wants to create a new
2802          * syncgroup.
2803          */
2804         if (group->id == 0) {
2805                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2806                 if (sg != NULL) {
2807                         SLIST_INIT(&sg->members);
2808                         sg->id = alloc_unr(pcmsg_unrhdr);
2809
2810                         group->id = sg->id;
2811                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2812                 } else
2813                         ret = ENOMEM;
2814         } else {
2815                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2816                         if (sg->id == group->id)
2817                                 break;
2818                 }
2819                 if (sg == NULL)
2820                         ret = EINVAL;
2821         }
2822
2823         /* Couldn't create or find a syncgroup.  Fail. */
2824         if (sg == NULL)
2825                 goto out;
2826
2827         /*
2828          * Allocate a syncmember, assign it and a channel together, and
2829          * insert into syncgroup.
2830          */
2831         if (group->mode & PCM_ENABLE_INPUT) {
2832                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2833                 if (smrd == NULL) {
2834                         ret = ENOMEM;
2835                         goto out;
2836                 }
2837
2838                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2839                 smrd->parent = sg;
2840                 smrd->ch = rdch;
2841
2842                 chn_abort(rdch);
2843                 rdch->flags |= CHN_F_NOTRIGGER;
2844                 rdch->sm = smrd;
2845         }
2846
2847         if (group->mode & PCM_ENABLE_OUTPUT) {
2848                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2849                 if (smwr == NULL) {
2850                         ret = ENOMEM;
2851                         goto out;
2852                 }
2853
2854                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2855                 smwr->parent = sg;
2856                 smwr->ch = wrch;
2857
2858                 chn_abort(wrch);
2859                 wrch->flags |= CHN_F_NOTRIGGER;
2860                 wrch->sm = smwr;
2861         }
2862
2863
2864 out:
2865         if (ret != 0) {
2866                 if (smrd != NULL)
2867                         free(smrd, M_DEVBUF);
2868                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2869                         sg_ids[2] = sg->id;
2870                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2871                         free(sg, M_DEVBUF);
2872                 }
2873
2874                 if (wrch)
2875                         wrch->sm = NULL;
2876                 if (rdch)
2877                         rdch->sm = NULL;
2878         }
2879
2880         if (wrch)
2881                 CHN_UNLOCK(wrch);
2882         if (rdch)
2883                 CHN_UNLOCK(rdch);
2884
2885         PCM_SG_UNLOCK();
2886
2887         if (sg_ids[0])
2888                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2889         if (sg_ids[1])
2890                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2891         if (sg_ids[2])
2892                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2893
2894         return (ret);
2895 }
2896
2897 /**
2898  * @brief Launch a sync group into action
2899  *
2900  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2901  * iterates over all members, triggering them along the way.
2902  *
2903  * @note Caller must not hold any channel locks.
2904  *
2905  * @param sg_id sync group identifier
2906  *
2907  * @retval 0    success
2908  * @retval non-zero     error worthy of propagating upstream to user
2909  */
2910 static int
2911 dsp_oss_syncstart(int sg_id)
2912 {
2913         struct pcmchan_syncmember *sm, *sm_tmp;
2914         struct pcmchan_syncgroup *sg;
2915         struct pcm_channel *c;
2916         int ret, needlocks;
2917
2918         /* Get the synclists lock */
2919         PCM_SG_LOCK();
2920
2921         do {
2922                 ret = 0;
2923                 needlocks = 0;
2924
2925                 /* Search for syncgroup by ID */
2926                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2927                         if (sg->id == sg_id)
2928                                 break;
2929                 }
2930
2931                 /* Return EINVAL if not found */
2932                 if (sg == NULL) {
2933                         ret = EINVAL;
2934                         break;
2935                 }
2936
2937                 /* Any removals resulting in an empty group should've handled this */
2938                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2939
2940                 /*
2941                  * Attempt to lock all member channels - if any are already
2942                  * locked, unlock those acquired, sleep for a bit, and try
2943                  * again.
2944                  */
2945                 SLIST_FOREACH(sm, &sg->members, link) {
2946                         if (CHN_TRYLOCK(sm->ch) == 0) {
2947                                 int timo = hz * 5/1000;
2948                                 if (timo < 1)
2949                                         timo = 1;
2950
2951                                 /* Release all locked channels so far, retry */
2952                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2953                                         /* sm is the member already locked */
2954                                         if (sm == sm_tmp)
2955                                                 break;
2956                                         CHN_UNLOCK(sm_tmp->ch);
2957                                 }
2958
2959                                 /** @todo Is PRIBIO correct/ */
2960                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2961                                     PRIBIO | PCATCH, "pcmsg", timo);
2962                                 if (ret == EINTR || ret == ERESTART)
2963                                         break;
2964
2965                                 needlocks = 1;
2966                                 ret = 0; /* Assumes ret == EAGAIN... */
2967                         }
2968                 }
2969         } while (needlocks && ret == 0);
2970
2971         /* Proceed only if no errors encountered. */
2972         if (ret == 0) {
2973                 /* Launch channels */
2974                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
2975                         SLIST_REMOVE_HEAD(&sg->members, link);
2976
2977                         c = sm->ch;
2978                         c->sm = NULL;
2979                         chn_start(c, 1);
2980                         c->flags &= ~CHN_F_NOTRIGGER;
2981                         CHN_UNLOCK(c);
2982
2983                         free(sm, M_DEVBUF);
2984                 }
2985
2986                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2987                 free(sg, M_DEVBUF);
2988         }
2989
2990         PCM_SG_UNLOCK();
2991
2992         /*
2993          * Free_unr() may sleep, so be sure to give up the syncgroup lock
2994          * first.
2995          */
2996         if (ret == 0)
2997                 free_unr(pcmsg_unrhdr, sg_id);
2998
2999         return (ret);
3000 }
3001
3002 /**
3003  * @brief Handler for SNDCTL_DSP_POLICY
3004  *
3005  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3006  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3007  * specifying those two parameters, s/he simply selects a number from 0..10
3008  * which corresponds to a buffer size.  Smaller numbers request smaller
3009  * buffers with lower latencies (at greater overhead from more frequent
3010  * interrupts), while greater numbers behave in the opposite manner.
3011  *
3012  * The 4Front spec states that a value of 5 should be the default.  However,
3013  * this implementation deviates slightly by using a linear scale without
3014  * consulting drivers.  I.e., even though drivers may have different default
3015  * buffer sizes, a policy argument of 5 will have the same result across
3016  * all drivers.
3017  *
3018  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3019  * more information.
3020  *
3021  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3022  *       work with hardware drivers directly.
3023  *
3024  * @note PCM channel arguments must not be locked by caller.
3025  *
3026  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3027  * @param rdch  " recording channel (optional; may be NULL)
3028  * @param policy Integer from [0:10]
3029  *
3030  * @retval 0    constant (for now)
3031  */
3032 static int
3033 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3034 {
3035         int ret;
3036
3037         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3038                 return (EIO);
3039
3040         /* Default: success */
3041         ret = 0;
3042
3043         if (rdch) {
3044                 CHN_LOCK(rdch);
3045                 ret = chn_setlatency(rdch, policy);
3046                 CHN_UNLOCK(rdch);
3047         }
3048
3049         if (wrch && ret == 0) {
3050                 CHN_LOCK(wrch);
3051                 ret = chn_setlatency(wrch, policy);
3052                 CHN_UNLOCK(wrch);
3053         }
3054
3055         if (ret)
3056                 ret = EIO;
3057
3058         return (ret);
3059 }
3060
3061 /**
3062  * @brief Enable or disable "cooked" mode
3063  *
3064  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3065  * is the default, the sound system handles rate and format conversions
3066  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3067  * operates with 44100Hz/16bit/signed samples).
3068  *
3069  * Disabling cooked mode is intended for applications wanting to mmap()
3070  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3071  * feeder architecture, presumably to gain as much control over audio
3072  * hardware as possible.
3073  *
3074  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3075  * for more details.
3076  *
3077  * @param wrch          playback channel (optional; may be NULL)
3078  * @param rdch          recording channel (optional; may be NULL)
3079  * @param enabled       0 = raw mode, 1 = cooked mode
3080  *
3081  * @retval EINVAL       Operation not yet supported.
3082  */
3083 static int
3084 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3085 {
3086
3087         /*
3088          * XXX I just don't get it. Why don't they call it
3089          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3090          * This is just plain so confusing, incoherent,
3091          * <insert any non-printable characters here>.
3092          */
3093         if (!(enabled == 1 || enabled == 0))
3094                 return (EINVAL);
3095
3096         /*
3097          * I won't give in. I'm inverting its logic here and now.
3098          * Brag all you want, but "BITPERFECT" should be the better
3099          * term here.
3100          */
3101         enabled ^= 0x00000001;
3102
3103         if (wrch != NULL) {
3104                 CHN_LOCK(wrch);
3105                 wrch->flags &= ~CHN_F_BITPERFECT;
3106                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3107                 CHN_UNLOCK(wrch);
3108         }
3109
3110         if (rdch != NULL) {
3111                 CHN_LOCK(rdch);
3112                 rdch->flags &= ~CHN_F_BITPERFECT;
3113                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3114                 CHN_UNLOCK(rdch);
3115         }
3116
3117         return (0);
3118 }
3119
3120 /**
3121  * @brief Retrieve channel interleaving order
3122  *
3123  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3124  *
3125  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3126  * for more details.
3127  *
3128  * @note As the ioctl definition is still under construction, FreeBSD
3129  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3130  *
3131  * @param wrch  playback channel (optional; may be NULL)
3132  * @param rdch  recording channel (optional; may be NULL)
3133  * @param map   channel map (result will be stored there)
3134  *
3135  * @retval EINVAL       Operation not yet supported.
3136  */
3137 static int
3138 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3139 {
3140         struct pcm_channel *ch;
3141         int ret;
3142
3143         ch = (wrch != NULL) ? wrch : rdch;
3144         if (ch != NULL) {
3145                 CHN_LOCK(ch);
3146                 ret = chn_oss_getorder(ch, map);
3147                 CHN_UNLOCK(ch);
3148         } else
3149                 ret = EINVAL;
3150
3151         return (ret);
3152 }
3153
3154 /**
3155  * @brief Specify channel interleaving order
3156  *
3157  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3158  *
3159  * @note As the ioctl definition is still under construction, FreeBSD
3160  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3161  *
3162  * @param wrch  playback channel (optional; may be NULL)
3163  * @param rdch  recording channel (optional; may be NULL)
3164  * @param map   channel map
3165  *
3166  * @retval EINVAL       Operation not yet supported.
3167  */
3168 static int
3169 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3170 {
3171         int ret;
3172
3173         ret = 0;
3174
3175         if (wrch != NULL) {
3176                 CHN_LOCK(wrch);
3177                 ret = chn_oss_setorder(wrch, map);
3178                 CHN_UNLOCK(wrch);
3179         }
3180
3181         if (ret == 0 && rdch != NULL) {
3182                 CHN_LOCK(rdch);
3183                 ret = chn_oss_setorder(rdch, map);
3184                 CHN_UNLOCK(rdch);
3185         }
3186
3187         return (ret);
3188 }
3189
3190 static int
3191 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3192     int *mask)
3193 {
3194         struct pcm_channel *ch;
3195         uint32_t chnmask;
3196         int ret;
3197
3198         chnmask = 0;
3199         ch = (wrch != NULL) ? wrch : rdch;
3200
3201         if (ch != NULL) {
3202                 CHN_LOCK(ch);
3203                 ret = chn_oss_getmask(ch, &chnmask);
3204                 CHN_UNLOCK(ch);
3205         } else
3206                 ret = EINVAL;
3207
3208         if (ret == 0)
3209                 *mask = chnmask;
3210
3211         return (ret);
3212 }
3213
3214 #ifdef OSSV4_EXPERIMENT
3215 /**
3216  * @brief Retrieve an audio device's label
3217  *
3218  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3219  *
3220  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3221  * for more details.
3222  *
3223  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3224  * consoles) can show variable "labels" for certain controls. By default
3225  * the application name (say quake) is shown as the label but
3226  * applications may change the labels themselves."
3227  *
3228  * @note As the ioctl definition is still under construction, FreeBSD
3229  *       does not currently support @c SNDCTL_GETLABEL.
3230  *
3231  * @param wrch  playback channel (optional; may be NULL)
3232  * @param rdch  recording channel (optional; may be NULL)
3233  * @param label label gets copied here
3234  *
3235  * @retval EINVAL       Operation not yet supported.
3236  */
3237 static int
3238 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3239 {
3240         return (EINVAL);
3241 }
3242
3243 /**
3244  * @brief Specify an audio device's label
3245  *
3246  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3247  * comments for @c dsp_oss_getlabel immediately above.
3248  *
3249  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3250  * for more details.
3251  *
3252  * @note As the ioctl definition is still under construction, FreeBSD
3253  *       does not currently support SNDCTL_SETLABEL.
3254  *
3255  * @param wrch  playback channel (optional; may be NULL)
3256  * @param rdch  recording channel (optional; may be NULL)
3257  * @param label label gets copied from here
3258  *
3259  * @retval EINVAL       Operation not yet supported.
3260  */
3261 static int
3262 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3263 {
3264         return (EINVAL);
3265 }
3266
3267 /**
3268  * @brief Retrieve name of currently played song
3269  *
3270  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3271  * tell the system the name of the currently playing song, which would be
3272  * visible in @c /dev/sndstat.
3273  *
3274  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3275  * for more details.
3276  *
3277  * @note As the ioctl definition is still under construction, FreeBSD
3278  *       does not currently support SNDCTL_GETSONG.
3279  *
3280  * @param wrch  playback channel (optional; may be NULL)
3281  * @param rdch  recording channel (optional; may be NULL)
3282  * @param song  song name gets copied here
3283  *
3284  * @retval EINVAL       Operation not yet supported.
3285  */
3286 static int
3287 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3288 {
3289         return (EINVAL);
3290 }
3291
3292 /**
3293  * @brief Retrieve name of currently played song
3294  *
3295  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3296  * tell the system the name of the currently playing song, which would be
3297  * visible in @c /dev/sndstat.
3298  *
3299  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3300  * for more details.
3301  *
3302  * @note As the ioctl definition is still under construction, FreeBSD
3303  *       does not currently support SNDCTL_SETSONG.
3304  *
3305  * @param wrch  playback channel (optional; may be NULL)
3306  * @param rdch  recording channel (optional; may be NULL)
3307  * @param song  song name gets copied from here
3308  *
3309  * @retval EINVAL       Operation not yet supported.
3310  */
3311 static int
3312 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3313 {
3314         return (EINVAL);
3315 }
3316
3317 /**
3318  * @brief Rename a device
3319  *
3320  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3321  *
3322  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3323  * more details.
3324  *
3325  * From Hannu@4Front:  "This call is used to change the device name
3326  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3327  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3328  * name depending on the current context (for example 'OSS virtual wave table
3329  * synth' or 'VoIP link to London')."
3330  *
3331  * @note As the ioctl definition is still under construction, FreeBSD
3332  *       does not currently support SNDCTL_SETNAME.
3333  *
3334  * @param wrch  playback channel (optional; may be NULL)
3335  * @param rdch  recording channel (optional; may be NULL)
3336  * @param name  new device name gets copied from here
3337  *
3338  * @retval EINVAL       Operation not yet supported.
3339  */
3340 static int
3341 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3342 {
3343         return (EINVAL);
3344 }
3345 #endif  /* !OSSV4_EXPERIMENT */