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/lock.h>
  36 #include <sys/rwlock.h>
  37 #include <sys/sysent.h>
  38
  39 #include <vm/vm.h>
  40 #include <vm/vm_object.h>
  41 #include <vm/vm_page.h>
  42 #include <vm/vm_pager.h>
  43
  44 SND_DECLARE_FILE("$FreeBSD$");
  45
  46 static int dsp_mmap_allow_prot_exec = 0;
  47 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
  48     &dsp_mmap_allow_prot_exec, 0,
  49     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
  50
  51 static int dsp_basename_clone = 1;
  52 SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
  53     &dsp_basename_clone, 0,
  54     "DSP basename cloning (0: Disable; 1: Enabled)");
  55 TUNABLE_INT("hw.snd.basename_clone", &dsp_basename_clone);
  56
  57 struct dsp_cdevinfo {
  58         struct pcm_channel *rdch, *wrch;
  59         struct pcm_channel *volch;
  60         int busy, simplex;
  61         TAILQ_ENTRY(dsp_cdevinfo) link;
  62 };
  63
  64 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  65 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  66 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  67 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  68
  69 #define DSP_CDEVINFO_CACHESIZE  8
  70
  71 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  72                                  (y) != NULL && (y)->si_drv1 != NULL)
  73
  74 #define OLDPCM_IOCTL
  75
  76 static d_open_t dsp_open;
  77 static d_close_t dsp_close;
  78 static d_read_t dsp_read;
  79 static d_write_t dsp_write;
  80 static d_ioctl_t dsp_ioctl;
  81 static d_poll_t dsp_poll;
  82 static d_mmap_t dsp_mmap;
  83 static d_mmap_single_t dsp_mmap_single;
  84
  85 struct cdevsw dsp_cdevsw = {
  86         .d_version =    D_VERSION,
  87         .d_open =       dsp_open,
  88         .d_close =      dsp_close,
  89         .d_read =       dsp_read,
  90         .d_write =      dsp_write,
  91         .d_ioctl =      dsp_ioctl,
  92         .d_poll =       dsp_poll,
  93         .d_mmap =       dsp_mmap,
  94         .d_mmap_single = dsp_mmap_single,
  95         .d_name =       "dsp",
  96 };
  97
  98 static eventhandler_tag dsp_ehtag = NULL;
  99 static int dsp_umax = -1;
 100 static int dsp_cmax = -1;
 101
 102 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
 103 static int dsp_oss_syncstart(int sg_id);
 104 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
 105 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
 106 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 107 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 108 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
 109 #ifdef OSSV4_EXPERIMENT
 110 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 111 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 112 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 113 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 114 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 115 #endif
 116
 117 static struct snddev_info *
 118 dsp_get_info(struct cdev *dev)
 119 {
 120         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 121 }
 122
 123 static uint32_t
 124 dsp_get_flags(struct cdev *dev)
 125 {
 126         device_t bdev;
 127
 128         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 129
 130         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 131 }
 132
 133 static void
 134 dsp_set_flags(struct cdev *dev, uint32_t flags)
 135 {
 136         device_t bdev;
 137
 138         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 139
 140         if (bdev != NULL)
 141                 pcm_setflags(bdev, flags);
 142 }
 143
 144 /*
 145  * return the channels associated with an open device instance.
 146  * lock channels specified.
 147  */
 148 static int
 149 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 150     uint32_t prio)
 151 {
 152         struct snddev_info *d;
 153         struct pcm_channel *ch;
 154         uint32_t flags;
 155
 156         if (PCM_SIMPLEX(dev) != 0) {
 157                 d = dsp_get_info(dev);
 158                 if (!PCM_REGISTERED(d))
 159                         return (ENXIO);
 160                 PCM_LOCK(d);
 161                 PCM_WAIT(d);
 162                 PCM_ACQUIRE(d);
 163                 /*
 164                  * Note: order is important -
 165                  *       pcm flags -> prio query flags -> wild guess
 166                  */
 167                 ch = NULL;
 168                 flags = dsp_get_flags(dev);
 169                 if (flags & SD_F_PRIO_WR) {
 170                         ch = PCM_RDCH(dev);
 171                         PCM_RDCH(dev) = NULL;
 172                 } else if (flags & SD_F_PRIO_RD) {
 173                         ch = PCM_WRCH(dev);
 174                         PCM_WRCH(dev) = NULL;
 175                 } else if (prio & SD_F_PRIO_WR) {
 176                         ch = PCM_RDCH(dev);
 177                         PCM_RDCH(dev) = NULL;
 178                         flags |= SD_F_PRIO_WR;
 179                 } else if (prio & SD_F_PRIO_RD) {
 180                         ch = PCM_WRCH(dev);
 181                         PCM_WRCH(dev) = NULL;
 182                         flags |= SD_F_PRIO_RD;
 183                 } else if (PCM_WRCH(dev) != NULL) {
 184                         ch = PCM_RDCH(dev);
 185                         PCM_RDCH(dev) = NULL;
 186                         flags |= SD_F_PRIO_WR;
 187                 } else if (PCM_RDCH(dev) != NULL) {
 188                         ch = PCM_WRCH(dev);
 189                         PCM_WRCH(dev) = NULL;
 190                         flags |= SD_F_PRIO_RD;
 191                 }
 192                 PCM_SIMPLEX(dev) = 0;
 193                 dsp_set_flags(dev, flags);
 194                 if (ch != NULL) {
 195                         CHN_LOCK(ch);
 196                         pcm_chnref(ch, -1);
 197                         pcm_chnrelease(ch);
 198                 }
 199                 PCM_RELEASE(d);
 200                 PCM_UNLOCK(d);
 201         }
 202
 203         *rdch = PCM_RDCH(dev);
 204         *wrch = PCM_WRCH(dev);
 205
 206         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 207                 CHN_LOCK(*rdch);
 208         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 209                 CHN_LOCK(*wrch);
 210
 211         return (0);
 212 }
 213
 214 /* unlock specified channels */
 215 static void
 216 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 217     uint32_t prio)
 218 {
 219         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 220                 CHN_UNLOCK(wrch);
 221         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 222                 CHN_UNLOCK(rdch);
 223 }
 224
 225 static void
 226 dsp_cdevinfo_alloc(struct cdev *dev,
 227     struct pcm_channel *rdch, struct pcm_channel *wrch,
 228     struct pcm_channel *volch)
 229 {
 230         struct snddev_info *d;
 231         struct dsp_cdevinfo *cdi;
 232         int simplex;
 233
 234         d = dsp_get_info(dev);
 235
 236         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 237             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 238             ("bogus %s(), what are you trying to accomplish here?", __func__));
 239         PCM_BUSYASSERT(d);
 240         PCM_LOCKASSERT(d);
 241
 242         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 243
 244         /*
 245          * Scan for free instance entry and put it into the end of list.
 246          * Create new one if necessary.
 247          */
 248         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 249                 if (cdi->busy != 0)
 250                         break;
 251                 cdi->rdch = rdch;
 252                 cdi->wrch = wrch;
 253                 cdi->volch = volch;
 254                 cdi->simplex = simplex;
 255                 cdi->busy = 1;
 256                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 257                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 258                 dev->si_drv1 = cdi;
 259                 return;
 260         }
 261         PCM_UNLOCK(d);
 262         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 263         PCM_LOCK(d);
 264         cdi->rdch = rdch;
 265         cdi->wrch = wrch;
 266         cdi->volch = volch;
 267         cdi->simplex = simplex;
 268         cdi->busy = 1;
 269         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 270         dev->si_drv1 = cdi;
 271 }
 272
 273 static void
 274 dsp_cdevinfo_free(struct cdev *dev)
 275 {
 276         struct snddev_info *d;
 277         struct dsp_cdevinfo *cdi, *tmp;
 278         uint32_t flags;
 279         int i;
 280
 281         d = dsp_get_info(dev);
 282
 283         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 284             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 285             PCM_VOLCH(dev) == NULL,
 286             ("bogus %s(), what are you trying to accomplish here?", __func__));
 287         PCM_BUSYASSERT(d);
 288         PCM_LOCKASSERT(d);
 289
 290         cdi = dev->si_drv1;
 291         dev->si_drv1 = NULL;
 292         cdi->rdch = NULL;
 293         cdi->wrch = NULL;
 294         cdi->volch = NULL;
 295         cdi->simplex = 0;
 296         cdi->busy = 0;
 297
 298         /*
 299          * Once it is free, move it back to the beginning of list for
 300          * faster new entry allocation.
 301          */
 302         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 303         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 304
 305         /*
 306          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 307          * Reset simplex flags.
 308          */
 309         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 310         i = DSP_CDEVINFO_CACHESIZE;
 311         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 312                 if (cdi->busy != 0) {
 313                         if (cdi->simplex == 0) {
 314                                 if (cdi->rdch != NULL)
 315                                         flags |= SD_F_PRIO_RD;
 316                                 if (cdi->wrch != NULL)
 317                                         flags |= SD_F_PRIO_WR;
 318                         }
 319                 } else {
 320                         if (i == 0) {
 321                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 322                                 free(cdi, M_DEVBUF);
 323                         } else
 324                                 i--;
 325                 }
 326         }
 327         dsp_set_flags(dev, flags);
 328 }
 329
 330 void
 331 dsp_cdevinfo_init(struct snddev_info *d)
 332 {
 333         struct dsp_cdevinfo *cdi;
 334         int i;
 335
 336         KASSERT(d != NULL, ("NULL snddev_info"));
 337         PCM_BUSYASSERT(d);
 338         PCM_UNLOCKASSERT(d);
 339
 340         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 341         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 342                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 343                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 344         }
 345 }
 346
 347 void
 348 dsp_cdevinfo_flush(struct snddev_info *d)
 349 {
 350         struct dsp_cdevinfo *cdi, *tmp;
 351
 352         KASSERT(d != NULL, ("NULL snddev_info"));
 353         PCM_BUSYASSERT(d);
 354         PCM_UNLOCKASSERT(d);
 355
 356         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 357         while (cdi != NULL) {
 358                 tmp = TAILQ_NEXT(cdi, link);
 359                 free(cdi, M_DEVBUF);
 360                 cdi = tmp;
 361         }
 362         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 363 }
 364
 365 /* duplex / simplex cdev type */
 366 enum {
 367         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 368         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 369         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 370 };
 371
 372 enum {
 373         DSP_CDEV_VOLCTL_NONE,
 374         DSP_CDEV_VOLCTL_READ,
 375         DSP_CDEV_VOLCTL_WRITE
 376 };
 377
 378 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 379 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 380 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 381 #define DSP_F_READ(x)           ((x) & FREAD)
 382 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 383
 384 static const struct {
 385         int type;
 386         char *name;
 387         char *sep;
 388         char *alias;
 389         int use_sep;
 390         int hw;
 391         int max;
 392         int volctl;
 393         uint32_t fmt, spd;
 394         int query;
 395 } dsp_cdevs[] = {
 396         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 397           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 398           DSP_CDEV_TYPE_RDWR },
 399         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 400           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 401           DSP_CDEV_TYPE_RDWR },
 402         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 403           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 404           DSP_CDEV_TYPE_RDWR },
 405         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 406           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 407         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 408           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 409         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 410           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 411         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 412           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 413         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 414           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 415         /* Low priority, OSSv4 aliases. */
 416         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
 417           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 418           DSP_CDEV_TYPE_RDWR },
 419         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
 420           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 421           DSP_CDEV_TYPE_RDWR },
 422         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
 423           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 424           DSP_CDEV_TYPE_RDWR },
 425         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
 426           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 427           DSP_CDEV_TYPE_RDWR },
 428         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
 429           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 430           DSP_CDEV_TYPE_RDWR },
 431 };
 432
 433 #define DSP_FIXUP_ERROR()               do {                            \
 434         prio = dsp_get_flags(i_dev);                                    \
 435         if (!DSP_F_VALID(flags))                                        \
 436                 error = EINVAL;                                         \
 437         if (!DSP_F_DUPLEX(flags) &&                                     \
 438             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 439             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 440                 error = ENOTSUP;                                        \
 441         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 442             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 443             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 444                 error = EBUSY;                                          \
 445         else if (DSP_REGISTERED(d, i_dev))                              \
 446                 error = EBUSY;                                          \
 447 } while (0)
 448
 449 static int
 450 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
 451 {
 452         struct pcm_channel *rdch, *wrch;
 453         struct snddev_info *d;
 454         uint32_t fmt, spd, prio, volctl;
 455         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 456
 457         /* Kind of impossible.. */
 458         if (i_dev == NULL || td == NULL)
 459                 return (ENODEV);
 460
 461         d = dsp_get_info(i_dev);
 462         if (!PCM_REGISTERED(d))
 463                 return (EBADF);
 464
 465         PCM_GIANT_ENTER(d);
 466
 467         /* Lock snddev so nobody else can monkey with it. */
 468         PCM_LOCK(d);
 469         PCM_WAIT(d);
 470
 471         /*
 472          * Try to acquire cloned device before someone else pick it.
 473          * ENODEV means this is not a cloned droids.
 474          */
 475         error = snd_clone_acquire(i_dev);
 476         if (!(error == 0 || error == ENODEV)) {
 477                 DSP_FIXUP_ERROR();
 478                 PCM_UNLOCK(d);
 479                 PCM_GIANT_EXIT(d);
 480                 return (error);
 481         }
 482
 483         error = 0;
 484         DSP_FIXUP_ERROR();
 485
 486         if (error != 0) {
 487                 (void)snd_clone_release(i_dev);
 488                 PCM_UNLOCK(d);
 489                 PCM_GIANT_EXIT(d);
 490                 return (error);
 491         }
 492
 493         /*
 494          * That is just enough. Acquire and unlock pcm lock so
 495          * the other will just have to wait until we finish doing
 496          * everything.
 497          */
 498         PCM_ACQUIRE(d);
 499         PCM_UNLOCK(d);
 500
 501         devtype = PCMDEV(i_dev);
 502         wdevunit = -1;
 503         rdevunit = -1;
 504         fmt = 0;
 505         spd = 0;
 506         volctl = DSP_CDEV_VOLCTL_NONE;
 507
 508         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 509                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 510                         continue;
 511                 /*
 512                  * Volume control only valid for DSPHW devices,
 513                  * and it must be opened in opposite direction be it
 514                  * simplex or duplex. Anything else will be handled
 515                  * as usual.
 516                  */
 517                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 518                         if (dsp_cdevs[i].volctl != 0 &&
 519                             DSP_F_READ(flags)) {
 520                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 521                                 flags &= ~FREAD;
 522                                 flags |= FWRITE;
 523                         }
 524                         if (DSP_F_READ(flags)) {
 525                                 (void)snd_clone_release(i_dev);
 526                                 PCM_RELEASE_QUICK(d);
 527                                 PCM_GIANT_EXIT(d);
 528                                 return (ENOTSUP);
 529                         }
 530                         wdevunit = dev2unit(i_dev);
 531                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 532                         if (dsp_cdevs[i].volctl != 0 &&
 533                             DSP_F_WRITE(flags)) {
 534                                 volctl = DSP_CDEV_VOLCTL_READ;
 535                                 flags &= ~FWRITE;
 536                                 flags |= FREAD;
 537                         }
 538                         if (DSP_F_WRITE(flags)) {
 539                                 (void)snd_clone_release(i_dev);
 540                                 PCM_RELEASE_QUICK(d);
 541                                 PCM_GIANT_EXIT(d);
 542                                 return (ENOTSUP);
 543                         }
 544                         rdevunit = dev2unit(i_dev);
 545                 }
 546                 fmt = dsp_cdevs[i].fmt;
 547                 spd = dsp_cdevs[i].spd;
 548                 break;
 549         }
 550
 551         /* No matching devtype? */
 552         if (fmt == 0 || spd == 0)
 553                 panic("impossible devtype %d", devtype);
 554
 555         rdch = NULL;
 556         wrch = NULL;
 557         rderror = 0;
 558         wrerror = 0;
 559
 560         /*
 561          * if we get here, the open request is valid- either:
 562          *   * we were previously not open
 563          *   * we were open for play xor record and the opener wants
 564          *     the non-open direction
 565          */
 566         if (DSP_F_READ(flags)) {
 567                 /* open for read */
 568                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 569                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
 570
 571                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 572                         rderror = ENXIO;
 573
 574                 if (volctl == DSP_CDEV_VOLCTL_READ)
 575                         rderror = 0;
 576
 577                 if (rderror != 0) {
 578                         if (rdch != NULL)
 579                                 pcm_chnrelease(rdch);
 580                         if (!DSP_F_DUPLEX(flags)) {
 581                                 (void)snd_clone_release(i_dev);
 582                                 PCM_RELEASE_QUICK(d);
 583                                 PCM_GIANT_EXIT(d);
 584                                 return (rderror);
 585                         }
 586                         rdch = NULL;
 587                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 588                         if (rdch != NULL) {
 589                                 pcm_chnref(rdch, 1);
 590                                 pcm_chnrelease(rdch);
 591                         }
 592                 } else {
 593                         if (flags & O_NONBLOCK)
 594                                 rdch->flags |= CHN_F_NBIO;
 595                         if (flags & O_EXCL)
 596                                 rdch->flags |= CHN_F_EXCLUSIVE;
 597                         pcm_chnref(rdch, 1);
 598                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 599                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 600                         CHN_UNLOCK(rdch);
 601                 }
 602         }
 603
 604         if (DSP_F_WRITE(flags)) {
 605                 /* open for write */
 606                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 607                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
 608
 609                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 610                         wrerror = ENXIO;
 611
 612                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 613                         wrerror = 0;
 614
 615                 if (wrerror != 0) {
 616                         if (wrch != NULL)
 617                                 pcm_chnrelease(wrch);
 618                         if (!DSP_F_DUPLEX(flags)) {
 619                                 if (rdch != NULL) {
 620                                         /*
 621                                          * Lock, deref and release previously
 622                                          * created record channel
 623                                          */
 624                                         CHN_LOCK(rdch);
 625                                         pcm_chnref(rdch, -1);
 626                                         pcm_chnrelease(rdch);
 627                                 }
 628                                 (void)snd_clone_release(i_dev);
 629                                 PCM_RELEASE_QUICK(d);
 630                                 PCM_GIANT_EXIT(d);
 631                                 return (wrerror);
 632                         }
 633                         wrch = NULL;
 634                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 635                         if (wrch != NULL) {
 636                                 pcm_chnref(wrch, 1);
 637                                 pcm_chnrelease(wrch);
 638                         }
 639                 } else {
 640                         if (flags & O_NONBLOCK)
 641                                 wrch->flags |= CHN_F_NBIO;
 642                         if (flags & O_EXCL)
 643                                 wrch->flags |= CHN_F_EXCLUSIVE;
 644                         pcm_chnref(wrch, 1);
 645                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 646                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 647                         CHN_UNLOCK(wrch);
 648                 }
 649         }
 650
 651
 652         PCM_LOCK(d);
 653
 654         /*
 655          * We're done. Allocate channels information for this cdev.
 656          */
 657         switch (volctl) {
 658         case DSP_CDEV_VOLCTL_READ:
 659                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 660                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 661                 break;
 662         case DSP_CDEV_VOLCTL_WRITE:
 663                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 664                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 665                 break;
 666         case DSP_CDEV_VOLCTL_NONE:
 667         default:
 668                 if (wrch == NULL && rdch == NULL) {
 669                         (void)snd_clone_release(i_dev);
 670                         PCM_RELEASE(d);
 671                         PCM_UNLOCK(d);
 672                         PCM_GIANT_EXIT(d);
 673                         if (wrerror != 0)
 674                                 return (wrerror);
 675                         if (rderror != 0)
 676                                 return (rderror);
 677                         return (EINVAL);
 678                 }
 679                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 680                 if (rdch != NULL)
 681                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 682                 if (wrch != NULL)
 683                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 684                 break;
 685         }
 686
 687         /*
 688          * Increase clone refcount for its automatic garbage collector.
 689          */
 690         (void)snd_clone_ref(i_dev);
 691
 692         PCM_RELEASE(d);
 693         PCM_UNLOCK(d);
 694
 695         PCM_GIANT_LEAVE(d);
 696
 697         return (0);
 698 }
 699
 700 static int
 701 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 702 {
 703         struct pcm_channel *rdch, *wrch, *volch;
 704         struct snddev_info *d;
 705         int sg_ids, rdref, wdref;
 706
 707         d = dsp_get_info(i_dev);
 708         if (!DSP_REGISTERED(d, i_dev))
 709                 return (EBADF);
 710
 711         PCM_GIANT_ENTER(d);
 712
 713         PCM_LOCK(d);
 714         PCM_WAIT(d);
 715         PCM_ACQUIRE(d);
 716
 717         rdch = PCM_RDCH(i_dev);
 718         wrch = PCM_WRCH(i_dev);
 719         volch = PCM_VOLCH(i_dev);
 720
 721         PCM_RDCH(i_dev) = NULL;
 722         PCM_WRCH(i_dev) = NULL;
 723         PCM_VOLCH(i_dev) = NULL;
 724
 725         rdref = -1;
 726         wdref = -1;
 727
 728         if (volch != NULL) {
 729                 if (volch == rdch)
 730                         rdref--;
 731                 else if (volch == wrch)
 732                         wdref--;
 733                 else {
 734                         CHN_LOCK(volch);
 735                         pcm_chnref(volch, -1);
 736                         CHN_UNLOCK(volch);
 737                 }
 738         }
 739
 740         if (rdch != NULL)
 741                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 742         if (wrch != NULL)
 743                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 744
 745         if (rdch != NULL || wrch != NULL) {
 746                 PCM_UNLOCK(d);
 747                 if (rdch != NULL) {
 748                         /*
 749                          * The channel itself need not be locked because:
 750                          *   a)  Adding a channel to a syncgroup happens only
 751                          *       in dsp_ioctl(), which cannot run concurrently
 752                          *       to dsp_close().
 753                          *   b)  The syncmember pointer (sm) is protected by
 754                          *       the global syncgroup list lock.
 755                          *   c)  A channel can't just disappear, invalidating
 756                          *       pointers, unless it's closed/dereferenced
 757                          *       first.
 758                          */
 759                         PCM_SG_LOCK();
 760                         sg_ids = chn_syncdestroy(rdch);
 761                         PCM_SG_UNLOCK();
 762                         if (sg_ids != 0)
 763                                 free_unr(pcmsg_unrhdr, sg_ids);
 764
 765                         CHN_LOCK(rdch);
 766                         pcm_chnref(rdch, rdref);
 767                         chn_abort(rdch); /* won't sleep */
 768                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 769                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 770                         chn_reset(rdch, 0, 0);
 771                         pcm_chnrelease(rdch);
 772                 }
 773                 if (wrch != NULL) {
 774                         /*
 775                          * Please see block above.
 776                          */
 777                         PCM_SG_LOCK();
 778                         sg_ids = chn_syncdestroy(wrch);
 779                         PCM_SG_UNLOCK();
 780                         if (sg_ids != 0)
 781                                 free_unr(pcmsg_unrhdr, sg_ids);
 782
 783                         CHN_LOCK(wrch);
 784                         pcm_chnref(wrch, wdref);
 785                         chn_flush(wrch); /* may sleep */
 786                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 787                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 788                         chn_reset(wrch, 0, 0);
 789                         pcm_chnrelease(wrch);
 790                 }
 791                 PCM_LOCK(d);
 792         }
 793
 794         dsp_cdevinfo_free(i_dev);
 795         /*
 796          * Release clone busy state and unref it so the automatic
 797          * garbage collector will get the hint and do the remaining
 798          * cleanup process.
 799          */
 800         (void)snd_clone_release(i_dev);
 801
 802         /*
 803          * destroy_dev() might sleep, so release pcm lock
 804          * here and rely on pcm cv serialization.
 805          */
 806         PCM_UNLOCK(d);
 807         (void)snd_clone_unref(i_dev);
 808         PCM_LOCK(d);
 809
 810         PCM_RELEASE(d);
 811         PCM_UNLOCK(d);
 812
 813         PCM_GIANT_LEAVE(d);
 814
 815         return (0);
 816 }
 817
 818 static __inline int
 819 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 820 {
 821         struct snddev_info *d;
 822         struct pcm_channel **ch, *rdch, *wrch;
 823         int (*chn_io)(struct pcm_channel *, struct uio *);
 824         int prio, ret;
 825         pid_t runpid;
 826
 827         KASSERT(i_dev != NULL && buf != NULL &&
 828             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 829             ("%s(): io train wreck!", __func__));
 830
 831         d = dsp_get_info(i_dev);
 832         if (!DSP_REGISTERED(d, i_dev))
 833                 return (EBADF);
 834
 835         PCM_GIANT_ENTER(d);
 836
 837         switch (buf->uio_rw) {
 838         case UIO_READ:
 839                 prio = SD_F_PRIO_RD;
 840                 ch = &rdch;
 841                 chn_io = chn_read;
 842                 break;
 843         case UIO_WRITE:
 844                 prio = SD_F_PRIO_WR;
 845                 ch = &wrch;
 846                 chn_io = chn_write;
 847                 break;
 848         default:
 849                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 850                 break;
 851         }
 852
 853         rdch = NULL;
 854         wrch = NULL;
 855         runpid = buf->uio_td->td_proc->p_pid;
 856
 857         getchns(i_dev, &rdch, &wrch, prio);
 858
 859         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 860                 PCM_GIANT_EXIT(d);
 861                 return (EBADF);
 862         }
 863
 864         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 865             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 866                 relchns(i_dev, rdch, wrch, prio);
 867                 PCM_GIANT_EXIT(d);
 868                 return (EINVAL);
 869         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 870                 (*ch)->flags |= CHN_F_RUNNING;
 871                 (*ch)->pid = runpid;
 872         }
 873
 874         /*
 875          * chn_read/write must give up channel lock in order to copy bytes
 876          * from/to userland, so up the "in progress" counter to make sure
 877          * someone else doesn't come along and muss up the buffer.
 878          */
 879         ++(*ch)->inprog;
 880         ret = chn_io(*ch, buf);
 881         --(*ch)->inprog;
 882
 883         CHN_BROADCAST(&(*ch)->cv);
 884
 885         relchns(i_dev, rdch, wrch, prio);
 886
 887         PCM_GIANT_LEAVE(d);
 888
 889         return (ret);
 890 }
 891
 892 static int
 893 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
 894 {
 895         return (dsp_io_ops(i_dev, buf));
 896 }
 897
 898 static int
 899 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
 900 {
 901         return (dsp_io_ops(i_dev, buf));
 902 }
 903
 904 static int
 905 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 906 {
 907         struct snddev_info *d;
 908         struct pcm_channel *c;
 909         int unit;
 910
 911         KASSERT(dev != NULL && volch != NULL,
 912             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 913
 914         d = dsp_get_info(dev);
 915         if (!PCM_REGISTERED(d)) {
 916                 *volch = NULL;
 917                 return (EINVAL);
 918         }
 919
 920         PCM_UNLOCKASSERT(d);
 921
 922         *volch = NULL;
 923
 924         c = PCM_VOLCH(dev);
 925         if (c != NULL) {
 926                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 927                         return (-1);
 928                 *volch = c;
 929                 return (0);
 930         }
 931
 932         PCM_LOCK(d);
 933         PCM_WAIT(d);
 934         PCM_ACQUIRE(d);
 935
 936         unit = dev2unit(dev);
 937
 938         CHN_FOREACH(c, d, channels.pcm) {
 939                 CHN_LOCK(c);
 940                 if (c->unit != unit) {
 941                         CHN_UNLOCK(c);
 942                         continue;
 943                 }
 944                 *volch = c;
 945                 pcm_chnref(c, 1);
 946                 PCM_VOLCH(dev) = c;
 947                 CHN_UNLOCK(c);
 948                 PCM_RELEASE(d);
 949                 PCM_UNLOCK(d);
 950                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 951         }
 952
 953         PCM_RELEASE(d);
 954         PCM_UNLOCK(d);
 955
 956         return (EINVAL);
 957 }
 958
 959 static int
 960 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 961     caddr_t arg)
 962 {
 963         struct snddev_info *d;
 964         struct pcm_channel *rdch, *wrch;
 965         int j, devtype, ret;
 966
 967         d = dsp_get_info(dev);
 968         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 969                 return (-1);
 970
 971         PCM_UNLOCKASSERT(d);
 972
 973         j = cmd & 0xff;
 974
 975         rdch = PCM_RDCH(dev);
 976         wrch = PCM_WRCH(dev);
 977
 978         /* No specific channel, look into cache */
 979         if (volch == NULL)
 980                 volch = PCM_VOLCH(dev);
 981
 982         /* Look harder */
 983         if (volch == NULL) {
 984                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 985                         volch = rdch;
 986                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 987                         volch = wrch;
 988         }
 989
 990         devtype = PCMDEV(dev);
 991
 992         /* Look super harder */
 993         if (volch == NULL &&
 994             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 995             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 996                 ret = dsp_get_volume_channel(dev, &volch);
 997                 if (ret != 0)
 998                         return (ret);
 999                 if (volch == NULL)
1000                         return (EINVAL);
1001         }
1002
1003         /* Final validation */
1004         if (volch != NULL) {
1005                 CHN_LOCK(volch);
1006                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
1007                         CHN_UNLOCK(volch);
1008                         return (-1);
1009                 }
1010                 if (volch->direction == PCMDIR_PLAY)
1011                         wrch = volch;
1012                 else
1013                         rdch = volch;
1014         }
1015
1016         ret = EINVAL;
1017
1018         if (volch != NULL &&
1019             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1020             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1021                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1022                         int left, right, center;
1023
1024                         left = *(int *)arg & 0x7f;
1025                         right = ((*(int *)arg) >> 8) & 0x7f;
1026                         center = (left + right) >> 1;
1027                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1028                             center);
1029                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1030                         *(int *)arg = CHN_GETVOLUME(volch,
1031                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1032                         *(int *)arg |= CHN_GETVOLUME(volch,
1033                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1034                 }
1035                 ret = 0;
1036         } else if (rdch != NULL || wrch != NULL) {
1037                 switch (j) {
1038                 case SOUND_MIXER_DEVMASK:
1039                 case SOUND_MIXER_CAPS:
1040                 case SOUND_MIXER_STEREODEVS:
1041                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1042                                 *(int *)arg = 0;
1043                                 if (rdch != NULL)
1044                                         *(int *)arg |= SOUND_MASK_RECLEV;
1045                                 if (wrch != NULL)
1046                                         *(int *)arg |= SOUND_MASK_PCM;
1047                         }
1048                         ret = 0;
1049                         break;
1050                 case SOUND_MIXER_RECMASK:
1051                 case SOUND_MIXER_RECSRC:
1052                         if ((cmd & ~0xff) == MIXER_READ(0))
1053                                 *(int *)arg = 0;
1054                         ret = 0;
1055                         break;
1056                 default:
1057                         break;
1058                 }
1059         }
1060
1061         if (volch != NULL)
1062                 CHN_UNLOCK(volch);
1063
1064         return (ret);
1065 }
1066
1067 static int
1068 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1069     struct thread *td)
1070 {
1071         struct pcm_channel *chn, *rdch, *wrch;
1072         struct snddev_info *d;
1073         u_long xcmd;
1074         int *arg_i, ret, tmp;
1075
1076         d = dsp_get_info(i_dev);
1077         if (!DSP_REGISTERED(d, i_dev))
1078                 return (EBADF);
1079
1080         PCM_GIANT_ENTER(d);
1081
1082         arg_i = (int *)arg;
1083         ret = 0;
1084         xcmd = 0;
1085         chn = NULL;
1086
1087         if (IOCGROUP(cmd) == 'M') {
1088                 if (cmd == OSS_GETVERSION) {
1089                         *arg_i = SOUND_VERSION;
1090                         PCM_GIANT_EXIT(d);
1091                         return (0);
1092                 }
1093                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1094                 if (ret != -1) {
1095                         PCM_GIANT_EXIT(d);
1096                         return (ret);
1097                 }
1098
1099                 if (d->mixer_dev != NULL) {
1100                         PCM_ACQUIRE_QUICK(d);
1101                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1102                             MIXER_CMD_DIRECT);
1103                         PCM_RELEASE_QUICK(d);
1104                 } else
1105                         ret = EBADF;
1106
1107                 PCM_GIANT_EXIT(d);
1108
1109                 return (ret);
1110         }
1111
1112         /*
1113          * Certain ioctls may be made on any type of device (audio, mixer,
1114          * and MIDI).  Handle those special cases here.
1115          */
1116         if (IOCGROUP(cmd) == 'X') {
1117                 PCM_ACQUIRE_QUICK(d);
1118                 switch(cmd) {
1119                 case SNDCTL_SYSINFO:
1120                         sound_oss_sysinfo((oss_sysinfo *)arg);
1121                         break;
1122                 case SNDCTL_CARDINFO:
1123                         ret = sound_oss_card_info((oss_card_info *)arg);
1124                         break;
1125                 case SNDCTL_AUDIOINFO:
1126                 case SNDCTL_AUDIOINFO_EX:
1127                 case SNDCTL_ENGINEINFO:
1128                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1129                         break;
1130                 case SNDCTL_MIXERINFO:
1131                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1132                         break;
1133                 default:
1134                         ret = EINVAL;
1135                 }
1136                 PCM_RELEASE_QUICK(d);
1137                 PCM_GIANT_EXIT(d);
1138                 return (ret);
1139         }
1140
1141         getchns(i_dev, &rdch, &wrch, 0);
1142
1143         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1144                 wrch = NULL;
1145         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1146                 rdch = NULL;
1147
1148         if (wrch == NULL && rdch == NULL) {
1149                 PCM_GIANT_EXIT(d);
1150                 return (EINVAL);
1151         }
1152
1153         switch(cmd) {
1154 #ifdef OLDPCM_IOCTL
1155         /*
1156          * we start with the new ioctl interface.
1157          */
1158         case AIONWRITE: /* how many bytes can write ? */
1159                 if (wrch) {
1160                         CHN_LOCK(wrch);
1161 /*
1162                 if (wrch && wrch->bufhard.dl)
1163                         while (chn_wrfeed(wrch) == 0);
1164 */
1165                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1166                         CHN_UNLOCK(wrch);
1167                 } else {
1168                         *arg_i = 0;
1169                         ret = EINVAL;
1170                 }
1171                 break;
1172
1173         case AIOSSIZE:     /* set the current blocksize */
1174                 {
1175                         struct snd_size *p = (struct snd_size *)arg;
1176
1177                         p->play_size = 0;
1178                         p->rec_size = 0;
1179                         PCM_ACQUIRE_QUICK(d);
1180                         if (wrch) {
1181                                 CHN_LOCK(wrch);
1182                                 chn_setblocksize(wrch, 2, p->play_size);
1183                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1184                                 CHN_UNLOCK(wrch);
1185                         }
1186                         if (rdch) {
1187                                 CHN_LOCK(rdch);
1188                                 chn_setblocksize(rdch, 2, p->rec_size);
1189                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1190                                 CHN_UNLOCK(rdch);
1191                         }
1192                         PCM_RELEASE_QUICK(d);
1193                 }
1194                 break;
1195         case AIOGSIZE:  /* get the current blocksize */
1196                 {
1197                         struct snd_size *p = (struct snd_size *)arg;
1198
1199                         if (wrch) {
1200                                 CHN_LOCK(wrch);
1201                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1202                                 CHN_UNLOCK(wrch);
1203                         }
1204                         if (rdch) {
1205                                 CHN_LOCK(rdch);
1206                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1207                                 CHN_UNLOCK(rdch);
1208                         }
1209                 }
1210                 break;
1211
1212         case AIOSFMT:
1213         case AIOGFMT:
1214                 {
1215                         snd_chan_param *p = (snd_chan_param *)arg;
1216
1217                         if (cmd == AIOSFMT &&
1218                             ((p->play_format != 0 && p->play_rate == 0) ||
1219                             (p->rec_format != 0 && p->rec_rate == 0))) {
1220                                 ret = EINVAL;
1221                                 break;
1222                         }
1223                         PCM_ACQUIRE_QUICK(d);
1224                         if (wrch) {
1225                                 CHN_LOCK(wrch);
1226                                 if (cmd == AIOSFMT && p->play_format != 0) {
1227                                         chn_setformat(wrch,
1228                                             SND_FORMAT(p->play_format,
1229                                             AFMT_CHANNEL(wrch->format),
1230                                             AFMT_EXTCHANNEL(wrch->format)));
1231                                         chn_setspeed(wrch, p->play_rate);
1232                                 }
1233                                 p->play_rate = wrch->speed;
1234                                 p->play_format = AFMT_ENCODING(wrch->format);
1235                                 CHN_UNLOCK(wrch);
1236                         } else {
1237                                 p->play_rate = 0;
1238                                 p->play_format = 0;
1239                         }
1240                         if (rdch) {
1241                                 CHN_LOCK(rdch);
1242                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1243                                         chn_setformat(rdch,
1244                                             SND_FORMAT(p->rec_format,
1245                                             AFMT_CHANNEL(rdch->format),
1246                                             AFMT_EXTCHANNEL(rdch->format)));
1247                                         chn_setspeed(rdch, p->rec_rate);
1248                                 }
1249                                 p->rec_rate = rdch->speed;
1250                                 p->rec_format = AFMT_ENCODING(rdch->format);
1251                                 CHN_UNLOCK(rdch);
1252                         } else {
1253                                 p->rec_rate = 0;
1254                                 p->rec_format = 0;
1255                         }
1256                         PCM_RELEASE_QUICK(d);
1257                 }
1258                 break;
1259
1260         case AIOGCAP:     /* get capabilities */
1261                 {
1262                         snd_capabilities *p = (snd_capabilities *)arg;
1263                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1264                         struct cdev *pdev;
1265
1266                         PCM_LOCK(d);
1267                         if (rdch) {
1268                                 CHN_LOCK(rdch);
1269                                 rcaps = chn_getcaps(rdch);
1270                         }
1271                         if (wrch) {
1272                                 CHN_LOCK(wrch);
1273                                 pcaps = chn_getcaps(wrch);
1274                         }
1275                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1276                                           pcaps? pcaps->minspeed : 0);
1277                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1278                                           pcaps? pcaps->maxspeed : 1000000);
1279                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1280                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1281                         /* XXX bad on sb16 */
1282                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1283                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1284                         if (rdch && wrch)
1285                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1286                         pdev = d->mixer_dev;
1287                         p->mixers = 1; /* default: one mixer */
1288                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1289                         p->left = p->right = 100;
1290                         if (wrch)
1291                                 CHN_UNLOCK(wrch);
1292                         if (rdch)
1293                                 CHN_UNLOCK(rdch);
1294                         PCM_UNLOCK(d);
1295                 }
1296                 break;
1297
1298         case AIOSTOP:
1299                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1300                         CHN_LOCK(wrch);
1301                         *arg_i = chn_abort(wrch);
1302                         CHN_UNLOCK(wrch);
1303                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1304                         CHN_LOCK(rdch);
1305                         *arg_i = chn_abort(rdch);
1306                         CHN_UNLOCK(rdch);
1307                 } else {
1308                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1309                         *arg_i = 0;
1310                 }
1311                 break;
1312
1313         case AIOSYNC:
1314                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1315                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1316                 break;
1317 #endif
1318         /*
1319          * here follow the standard ioctls (filio.h etc.)
1320          */
1321         case FIONREAD: /* get # bytes to read */
1322                 if (rdch) {
1323                         CHN_LOCK(rdch);
1324 /*                      if (rdch && rdch->bufhard.dl)
1325                                 while (chn_rdfeed(rdch) == 0);
1326 */
1327                         *arg_i = sndbuf_getready(rdch->bufsoft);
1328                         CHN_UNLOCK(rdch);
1329                 } else {
1330                         *arg_i = 0;
1331                         ret = EINVAL;
1332                 }
1333                 break;
1334
1335         case FIOASYNC: /*set/clear async i/o */
1336                 DEB( printf("FIOASYNC\n") ; )
1337                 break;
1338
1339         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1340         case FIONBIO: /* set/clear non-blocking i/o */
1341                 if (rdch) {
1342                         CHN_LOCK(rdch);
1343                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1344                                 rdch->flags |= CHN_F_NBIO;
1345                         else
1346                                 rdch->flags &= ~CHN_F_NBIO;
1347                         CHN_UNLOCK(rdch);
1348                 }
1349                 if (wrch) {
1350                         CHN_LOCK(wrch);
1351                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1352                                 wrch->flags |= CHN_F_NBIO;
1353                         else
1354                                 wrch->flags &= ~CHN_F_NBIO;
1355                         CHN_UNLOCK(wrch);
1356                 }
1357                 break;
1358
1359         /*
1360          * Finally, here is the linux-compatible ioctl interface
1361          */
1362 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1363         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1364         case SNDCTL_DSP_GETBLKSIZE:
1365                 chn = wrch ? wrch : rdch;
1366                 if (chn) {
1367                         CHN_LOCK(chn);
1368                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1369                         CHN_UNLOCK(chn);
1370                 } else {
1371                         *arg_i = 0;
1372                         ret = EINVAL;
1373                 }
1374                 break;
1375
1376         case SNDCTL_DSP_SETBLKSIZE:
1377                 RANGE(*arg_i, 16, 65536);
1378                 PCM_ACQUIRE_QUICK(d);
1379                 if (wrch) {
1380                         CHN_LOCK(wrch);
1381                         chn_setblocksize(wrch, 2, *arg_i);
1382                         CHN_UNLOCK(wrch);
1383                 }
1384                 if (rdch) {
1385                         CHN_LOCK(rdch);
1386                         chn_setblocksize(rdch, 2, *arg_i);
1387                         CHN_UNLOCK(rdch);
1388                 }
1389                 PCM_RELEASE_QUICK(d);
1390                 break;
1391
1392         case SNDCTL_DSP_RESET:
1393                 DEB(printf("dsp reset\n"));
1394                 if (wrch) {
1395                         CHN_LOCK(wrch);
1396                         chn_abort(wrch);
1397                         chn_resetbuf(wrch);
1398                         CHN_UNLOCK(wrch);
1399                 }
1400                 if (rdch) {
1401                         CHN_LOCK(rdch);
1402                         chn_abort(rdch);
1403                         chn_resetbuf(rdch);
1404                         CHN_UNLOCK(rdch);
1405                 }
1406                 break;
1407
1408         case SNDCTL_DSP_SYNC:
1409                 DEB(printf("dsp sync\n"));
1410                 /* chn_sync may sleep */
1411                 if (wrch) {
1412                         CHN_LOCK(wrch);
1413                         chn_sync(wrch, 0);
1414                         CHN_UNLOCK(wrch);
1415                 }
1416                 break;
1417
1418         case SNDCTL_DSP_SPEED:
1419                 /* chn_setspeed may sleep */
1420                 tmp = 0;
1421                 PCM_ACQUIRE_QUICK(d);
1422                 if (wrch) {
1423                         CHN_LOCK(wrch);
1424                         ret = chn_setspeed(wrch, *arg_i);
1425                         tmp = wrch->speed;
1426                         CHN_UNLOCK(wrch);
1427                 }
1428                 if (rdch && ret == 0) {
1429                         CHN_LOCK(rdch);
1430                         ret = chn_setspeed(rdch, *arg_i);
1431                         if (tmp == 0)
1432                                 tmp = rdch->speed;
1433                         CHN_UNLOCK(rdch);
1434                 }
1435                 PCM_RELEASE_QUICK(d);
1436                 *arg_i = tmp;
1437                 break;
1438
1439         case SOUND_PCM_READ_RATE:
1440                 chn = wrch ? wrch : rdch;
1441                 if (chn) {
1442                         CHN_LOCK(chn);
1443                         *arg_i = chn->speed;
1444                         CHN_UNLOCK(chn);
1445                 } else {
1446                         *arg_i = 0;
1447                         ret = EINVAL;
1448                 }
1449                 break;
1450
1451         case SNDCTL_DSP_STEREO:
1452                 tmp = -1;
1453                 *arg_i = (*arg_i)? 2 : 1;
1454                 PCM_ACQUIRE_QUICK(d);
1455                 if (wrch) {
1456                         CHN_LOCK(wrch);
1457                         ret = chn_setformat(wrch,
1458                             SND_FORMAT(wrch->format, *arg_i, 0));
1459                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1460                         CHN_UNLOCK(wrch);
1461                 }
1462                 if (rdch && ret == 0) {
1463                         CHN_LOCK(rdch);
1464                         ret = chn_setformat(rdch,
1465                             SND_FORMAT(rdch->format, *arg_i, 0));
1466                         if (tmp == -1)
1467                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1468                         CHN_UNLOCK(rdch);
1469                 }
1470                 PCM_RELEASE_QUICK(d);
1471                 *arg_i = tmp;
1472                 break;
1473
1474         case SOUND_PCM_WRITE_CHANNELS:
1475 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1476                 if (*arg_i < 0) {
1477                         *arg_i = 0;
1478                         ret = EINVAL;
1479                         break;
1480                 }
1481                 if (*arg_i != 0) {
1482                         struct pcmchan_matrix *m;
1483                         uint32_t ext;
1484
1485                         tmp = 0;
1486                         if (*arg_i > SND_CHN_MAX)
1487                                 *arg_i = SND_CHN_MAX;
1488
1489                         m = feeder_matrix_default_channel_map(*arg_i);
1490                         if (m != NULL)
1491                                 ext = m->ext;
1492                         else
1493                                 ext = 0;
1494
1495                         PCM_ACQUIRE_QUICK(d);
1496                         if (wrch) {
1497                                 CHN_LOCK(wrch);
1498                                 ret = chn_setformat(wrch,
1499                                     SND_FORMAT(wrch->format, *arg_i, ext));
1500                                 tmp = AFMT_CHANNEL(wrch->format);
1501                                 CHN_UNLOCK(wrch);
1502                         }
1503                         if (rdch && ret == 0) {
1504                                 CHN_LOCK(rdch);
1505                                 ret = chn_setformat(rdch,
1506                                     SND_FORMAT(rdch->format, *arg_i, ext));
1507                                 if (tmp == 0)
1508                                         tmp = AFMT_CHANNEL(rdch->format);
1509                                 CHN_UNLOCK(rdch);
1510                         }
1511                         PCM_RELEASE_QUICK(d);
1512                         *arg_i = tmp;
1513                 } else {
1514                         chn = wrch ? wrch : rdch;
1515                         CHN_LOCK(chn);
1516                         *arg_i = AFMT_CHANNEL(chn->format);
1517                         CHN_UNLOCK(chn);
1518                 }
1519                 break;
1520
1521         case SOUND_PCM_READ_CHANNELS:
1522                 chn = wrch ? wrch : rdch;
1523                 if (chn) {
1524                         CHN_LOCK(chn);
1525                         *arg_i = AFMT_CHANNEL(chn->format);
1526                         CHN_UNLOCK(chn);
1527                 } else {
1528                         *arg_i = 0;
1529                         ret = EINVAL;
1530                 }
1531                 break;
1532
1533         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1534                 chn = wrch ? wrch : rdch;
1535                 if (chn) {
1536                         CHN_LOCK(chn);
1537                         *arg_i = chn_getformats(chn);
1538                         CHN_UNLOCK(chn);
1539                 } else {
1540                         *arg_i = 0;
1541                         ret = EINVAL;
1542                 }
1543                 break;
1544
1545         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1546                 if (*arg_i != AFMT_QUERY) {
1547                         tmp = 0;
1548                         PCM_ACQUIRE_QUICK(d);
1549                         if (wrch) {
1550                                 CHN_LOCK(wrch);
1551                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1552                                     AFMT_CHANNEL(wrch->format),
1553                                     AFMT_EXTCHANNEL(wrch->format)));
1554                                 tmp = wrch->format;
1555                                 CHN_UNLOCK(wrch);
1556                         }
1557                         if (rdch && ret == 0) {
1558                                 CHN_LOCK(rdch);
1559                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1560                                     AFMT_CHANNEL(rdch->format),
1561                                     AFMT_EXTCHANNEL(rdch->format)));
1562                                 if (tmp == 0)
1563                                         tmp = rdch->format;
1564                                 CHN_UNLOCK(rdch);
1565                         }
1566                         PCM_RELEASE_QUICK(d);
1567                         *arg_i = AFMT_ENCODING(tmp);
1568                 } else {
1569                         chn = wrch ? wrch : rdch;
1570                         CHN_LOCK(chn);
1571                         *arg_i = AFMT_ENCODING(chn->format);
1572                         CHN_UNLOCK(chn);
1573                 }
1574                 break;
1575
1576         case SNDCTL_DSP_SETFRAGMENT:
1577                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1578                 {
1579                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1580                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1581                         uint32_t fragsz;
1582                         uint32_t r_maxfrags, r_fragsz;
1583
1584                         RANGE(fragln, 4, 16);
1585                         fragsz = 1 << fragln;
1586
1587                         if (maxfrags == 0)
1588                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1589                         if (maxfrags < 2)
1590                                 maxfrags = 2;
1591                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1592                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1593
1594                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1595                         PCM_ACQUIRE_QUICK(d);
1596                         if (rdch) {
1597                                 CHN_LOCK(rdch);
1598                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1599                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1600                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1601                                 CHN_UNLOCK(rdch);
1602                         } else {
1603                                 r_maxfrags = maxfrags;
1604                                 r_fragsz = fragsz;
1605                         }
1606                         if (wrch && ret == 0) {
1607                                 CHN_LOCK(wrch);
1608                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1609                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1610                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1611                                 CHN_UNLOCK(wrch);
1612                         } else { /* use whatever came from the read channel */
1613                                 maxfrags = r_maxfrags;
1614                                 fragsz = r_fragsz;
1615                         }
1616                         PCM_RELEASE_QUICK(d);
1617
1618                         fragln = 0;
1619                         while (fragsz > 1) {
1620                                 fragln++;
1621                                 fragsz >>= 1;
1622                         }
1623                         *arg_i = (maxfrags << 16) | fragln;
1624                 }
1625                 break;
1626
1627         case SNDCTL_DSP_GETISPACE:
1628                 /* return the size of data available in the input queue */
1629                 {
1630                         audio_buf_info *a = (audio_buf_info *)arg;
1631                         if (rdch) {
1632                                 struct snd_dbuf *bs = rdch->bufsoft;
1633
1634                                 CHN_LOCK(rdch);
1635                                 a->bytes = sndbuf_getready(bs);
1636                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1637                                 a->fragstotal = sndbuf_getblkcnt(bs);
1638                                 a->fragsize = sndbuf_getblksz(bs);
1639                                 CHN_UNLOCK(rdch);
1640                         } else
1641                                 ret = EINVAL;
1642                 }
1643                 break;
1644
1645         case SNDCTL_DSP_GETOSPACE:
1646                 /* return space available in the output queue */
1647                 {
1648                         audio_buf_info *a = (audio_buf_info *)arg;
1649                         if (wrch) {
1650                                 struct snd_dbuf *bs = wrch->bufsoft;
1651
1652                                 CHN_LOCK(wrch);
1653                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1654                                 a->bytes = sndbuf_getfree(bs);
1655                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1656                                 a->fragstotal = sndbuf_getblkcnt(bs);
1657                                 a->fragsize = sndbuf_getblksz(bs);
1658                                 CHN_UNLOCK(wrch);
1659                         } else
1660                                 ret = EINVAL;
1661                 }
1662                 break;
1663
1664         case SNDCTL_DSP_GETIPTR:
1665                 {
1666                         count_info *a = (count_info *)arg;
1667                         if (rdch) {
1668                                 struct snd_dbuf *bs = rdch->bufsoft;
1669
1670                                 CHN_LOCK(rdch);
1671                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1672                                 a->bytes = sndbuf_gettotal(bs);
1673                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1674                                 a->ptr = sndbuf_getfreeptr(bs);
1675                                 rdch->blocks = sndbuf_getblocks(bs);
1676                                 CHN_UNLOCK(rdch);
1677                         } else
1678                                 ret = EINVAL;
1679                 }
1680                 break;
1681
1682         case SNDCTL_DSP_GETOPTR:
1683                 {
1684                         count_info *a = (count_info *)arg;
1685                         if (wrch) {
1686                                 struct snd_dbuf *bs = wrch->bufsoft;
1687
1688                                 CHN_LOCK(wrch);
1689                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1690                                 a->bytes = sndbuf_gettotal(bs);
1691                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1692                                 a->ptr = sndbuf_getreadyptr(bs);
1693                                 wrch->blocks = sndbuf_getblocks(bs);
1694                                 CHN_UNLOCK(wrch);
1695                         } else
1696                                 ret = EINVAL;
1697                 }
1698                 break;
1699
1700         case SNDCTL_DSP_GETCAPS:
1701                 PCM_LOCK(d);
1702                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1703                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1704                         *arg_i |= PCM_CAP_DUPLEX;
1705                 PCM_UNLOCK(d);
1706                 break;
1707
1708         case SOUND_PCM_READ_BITS:
1709                 chn = wrch ? wrch : rdch;
1710                 if (chn) {
1711                         CHN_LOCK(chn);
1712                         if (chn->format & AFMT_8BIT)
1713                                 *arg_i = 8;
1714                         else if (chn->format & AFMT_16BIT)
1715                                 *arg_i = 16;
1716                         else if (chn->format & AFMT_24BIT)
1717                                 *arg_i = 24;
1718                         else if (chn->format & AFMT_32BIT)
1719                                 *arg_i = 32;
1720                         else
1721                                 ret = EINVAL;
1722                         CHN_UNLOCK(chn);
1723                 } else {
1724                         *arg_i = 0;
1725                         ret = EINVAL;
1726                 }
1727                 break;
1728
1729         case SNDCTL_DSP_SETTRIGGER:
1730                 if (rdch) {
1731                         CHN_LOCK(rdch);
1732                         rdch->flags &= ~CHN_F_NOTRIGGER;
1733                         if (*arg_i & PCM_ENABLE_INPUT)
1734                                 chn_start(rdch, 1);
1735                         else {
1736                                 chn_abort(rdch);
1737                                 chn_resetbuf(rdch);
1738                                 rdch->flags |= CHN_F_NOTRIGGER;
1739                         }
1740                         CHN_UNLOCK(rdch);
1741                 }
1742                 if (wrch) {
1743                         CHN_LOCK(wrch);
1744                         wrch->flags &= ~CHN_F_NOTRIGGER;
1745                         if (*arg_i & PCM_ENABLE_OUTPUT)
1746                                 chn_start(wrch, 1);
1747                         else {
1748                                 chn_abort(wrch);
1749                                 chn_resetbuf(wrch);
1750                                 wrch->flags |= CHN_F_NOTRIGGER;
1751                         }
1752                         CHN_UNLOCK(wrch);
1753                 }
1754                 break;
1755
1756         case SNDCTL_DSP_GETTRIGGER:
1757                 *arg_i = 0;
1758                 if (wrch) {
1759                         CHN_LOCK(wrch);
1760                         if (wrch->flags & CHN_F_TRIGGERED)
1761                                 *arg_i |= PCM_ENABLE_OUTPUT;
1762                         CHN_UNLOCK(wrch);
1763                 }
1764                 if (rdch) {
1765                         CHN_LOCK(rdch);
1766                         if (rdch->flags & CHN_F_TRIGGERED)
1767                                 *arg_i |= PCM_ENABLE_INPUT;
1768                         CHN_UNLOCK(rdch);
1769                 }
1770                 break;
1771
1772         case SNDCTL_DSP_GETODELAY:
1773                 if (wrch) {
1774                         struct snd_dbuf *bs = wrch->bufsoft;
1775
1776                         CHN_LOCK(wrch);
1777                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1778                         *arg_i = sndbuf_getready(bs);
1779                         CHN_UNLOCK(wrch);
1780                 } else
1781                         ret = EINVAL;
1782                 break;
1783
1784         case SNDCTL_DSP_POST:
1785                 if (wrch) {
1786                         CHN_LOCK(wrch);
1787                         wrch->flags &= ~CHN_F_NOTRIGGER;
1788                         chn_start(wrch, 1);
1789                         CHN_UNLOCK(wrch);
1790                 }
1791                 break;
1792
1793         case SNDCTL_DSP_SETDUPLEX:
1794                 /*
1795                  * switch to full-duplex mode if card is in half-duplex
1796                  * mode and is able to work in full-duplex mode
1797                  */
1798                 PCM_LOCK(d);
1799                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1800                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1801                 PCM_UNLOCK(d);
1802                 break;
1803
1804         /*
1805          * The following four ioctls are simple wrappers around mixer_ioctl
1806          * with no further processing.  xcmd is short for "translated
1807          * command".
1808          */
1809         case SNDCTL_DSP_GETRECVOL:
1810                 if (xcmd == 0) {
1811                         xcmd = SOUND_MIXER_READ_RECLEV;
1812                         chn = rdch;
1813                 }
1814                 /* FALLTHROUGH */
1815         case SNDCTL_DSP_SETRECVOL:
1816                 if (xcmd == 0) {
1817                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1818                         chn = rdch;
1819                 }
1820                 /* FALLTHROUGH */
1821         case SNDCTL_DSP_GETPLAYVOL:
1822                 if (xcmd == 0) {
1823                         xcmd = SOUND_MIXER_READ_PCM;
1824                         chn = wrch;
1825                 }
1826                 /* FALLTHROUGH */
1827         case SNDCTL_DSP_SETPLAYVOL:
1828                 if (xcmd == 0) {
1829                         xcmd = SOUND_MIXER_WRITE_PCM;
1830                         chn = wrch;
1831                 }
1832
1833                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1834                 if (ret != -1) {
1835                         PCM_GIANT_EXIT(d);
1836                         return (ret);
1837                 }
1838
1839                 if (d->mixer_dev != NULL) {
1840                         PCM_ACQUIRE_QUICK(d);
1841                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1842                             MIXER_CMD_DIRECT);
1843                         PCM_RELEASE_QUICK(d);
1844                 } else
1845                         ret = ENOTSUP;
1846
1847                 break;
1848
1849         case SNDCTL_DSP_GET_RECSRC_NAMES:
1850         case SNDCTL_DSP_GET_RECSRC:
1851         case SNDCTL_DSP_SET_RECSRC:
1852                 if (d->mixer_dev != NULL) {
1853                         PCM_ACQUIRE_QUICK(d);
1854                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1855                             MIXER_CMD_DIRECT);
1856                         PCM_RELEASE_QUICK(d);
1857                 } else
1858                         ret = ENOTSUP;
1859                 break;
1860
1861         /*
1862          * The following 3 ioctls aren't very useful at the moment.  For
1863          * now, only a single channel is associated with a cdev (/dev/dspN
1864          * instance), so there's only a single output routing to use (i.e.,
1865          * the wrch bound to this cdev).
1866          */
1867         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1868                 {
1869                         oss_mixer_enuminfo *ei;
1870                         ei = (oss_mixer_enuminfo *)arg;
1871                         ei->dev = 0;
1872                         ei->ctrl = 0;
1873                         ei->version = 0; /* static for now */
1874                         ei->strindex[0] = 0;
1875
1876                         if (wrch != NULL) {
1877                                 ei->nvalues = 1;
1878                                 strlcpy(ei->strings, wrch->name,
1879                                         sizeof(ei->strings));
1880                         } else {
1881                                 ei->nvalues = 0;
1882                                 ei->strings[0] = '\0';
1883                         }
1884                 }
1885                 break;
1886         case SNDCTL_DSP_GET_PLAYTGT:
1887         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1888                 /*
1889                  * Re: SET_PLAYTGT
1890                  *   OSSv4: "The value that was accepted by the device will
1891                  *   be returned back in the variable pointed by the
1892                  *   argument."
1893                  */
1894                 if (wrch != NULL)
1895                         *arg_i = 0;
1896                 else
1897                         ret = EINVAL;
1898                 break;
1899
1900         case SNDCTL_DSP_SILENCE:
1901         /*
1902          * Flush the software (pre-feed) buffer, but try to minimize playback
1903          * interruption.  (I.e., record unplayed samples with intent to
1904          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1905          * functionality.
1906          */
1907                 if (wrch == NULL)
1908                         ret = EINVAL;
1909                 else {
1910                         struct snd_dbuf *bs;
1911                         CHN_LOCK(wrch);
1912                         while (wrch->inprog != 0)
1913                                 cv_wait(&wrch->cv, wrch->lock);
1914                         bs = wrch->bufsoft;
1915                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1916                                 bs->sl = sndbuf_getready(bs);
1917                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1918                                 sndbuf_fillsilence(bs);
1919                                 chn_start(wrch, 0);
1920                         }
1921                         CHN_UNLOCK(wrch);
1922                 }
1923                 break;
1924
1925         case SNDCTL_DSP_SKIP:
1926         /*
1927          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1928          * playback buffer by moving the current write position immediately
1929          * before the point where the device is currently reading the samples."
1930          */
1931                 if (wrch == NULL)
1932                         ret = EINVAL;
1933                 else {
1934                         struct snd_dbuf *bs;
1935                         CHN_LOCK(wrch);
1936                         while (wrch->inprog != 0)
1937                                 cv_wait(&wrch->cv, wrch->lock);
1938                         bs = wrch->bufsoft;
1939                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1940                                 sndbuf_softreset(bs);
1941                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1942                                 bs->sl = 0;
1943                                 chn_start(wrch, 0);
1944                         }
1945                         CHN_UNLOCK(wrch);
1946                 }
1947                 break;
1948
1949         case SNDCTL_DSP_CURRENT_OPTR:
1950         case SNDCTL_DSP_CURRENT_IPTR:
1951         /**
1952          * @note Changing formats resets the buffer counters, which differs
1953          *       from the 4Front drivers.  However, I don't expect this to be
1954          *       much of a problem.
1955          *
1956          * @note In a test where @c CURRENT_OPTR is called immediately after write
1957          *       returns, this driver is about 32K samples behind whereas
1958          *       4Front's is about 8K samples behind.  Should determine source
1959          *       of discrepancy, even if only out of curiosity.
1960          *
1961          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1962          */
1963                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1964                 if (chn == NULL)
1965                         ret = EINVAL;
1966                 else {
1967                         struct snd_dbuf *bs;
1968                         /* int tmp; */
1969
1970                         oss_count_t *oc = (oss_count_t *)arg;
1971
1972                         CHN_LOCK(chn);
1973                         bs = chn->bufsoft;
1974 #if 0
1975                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1976                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1977                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1978 #else
1979                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1980                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1981 #endif
1982                         CHN_UNLOCK(chn);
1983                 }
1984                 break;
1985
1986         case SNDCTL_DSP_HALT_OUTPUT:
1987         case SNDCTL_DSP_HALT_INPUT:
1988                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1989                 if (chn == NULL)
1990                         ret = EINVAL;
1991                 else {
1992                         CHN_LOCK(chn);
1993                         chn_abort(chn);
1994                         CHN_UNLOCK(chn);
1995                 }
1996                 break;
1997
1998         case SNDCTL_DSP_LOW_WATER:
1999         /*
2000          * Set the number of bytes required to attract attention by
2001          * select/poll.
2002          */
2003                 if (wrch != NULL) {
2004                         CHN_LOCK(wrch);
2005                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
2006                         CHN_UNLOCK(wrch);
2007                 }
2008                 if (rdch != NULL) {
2009                         CHN_LOCK(rdch);
2010                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2011                         CHN_UNLOCK(rdch);
2012                 }
2013                 break;
2014
2015         case SNDCTL_DSP_GETERROR:
2016         /*
2017          * OSSv4 docs:  "All errors and counters will automatically be
2018          * cleared to zeroes after the call so each call will return only
2019          * the errors that occurred after the previous invocation. ... The
2020          * play_underruns and rec_overrun fields are the only useful fields
2021          * returned by OSS 4.0."
2022          */
2023                 {
2024                         audio_errinfo *ei = (audio_errinfo *)arg;
2025
2026                         bzero((void *)ei, sizeof(*ei));
2027
2028                         if (wrch != NULL) {
2029                                 CHN_LOCK(wrch);
2030                                 ei->play_underruns = wrch->xruns;
2031                                 wrch->xruns = 0;
2032                                 CHN_UNLOCK(wrch);
2033                         }
2034                         if (rdch != NULL) {
2035                                 CHN_LOCK(rdch);
2036                                 ei->rec_overruns = rdch->xruns;
2037                                 rdch->xruns = 0;
2038                                 CHN_UNLOCK(rdch);
2039                         }
2040                 }
2041                 break;
2042
2043         case SNDCTL_DSP_SYNCGROUP:
2044                 PCM_ACQUIRE_QUICK(d);
2045                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2046                 PCM_RELEASE_QUICK(d);
2047                 break;
2048
2049         case SNDCTL_DSP_SYNCSTART:
2050                 PCM_ACQUIRE_QUICK(d);
2051                 ret = dsp_oss_syncstart(*arg_i);
2052                 PCM_RELEASE_QUICK(d);
2053                 break;
2054
2055         case SNDCTL_DSP_POLICY:
2056                 PCM_ACQUIRE_QUICK(d);
2057                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2058                 PCM_RELEASE_QUICK(d);
2059                 break;
2060
2061         case SNDCTL_DSP_COOKEDMODE:
2062                 PCM_ACQUIRE_QUICK(d);
2063                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2064                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2065                 PCM_RELEASE_QUICK(d);
2066                 break;
2067         case SNDCTL_DSP_GET_CHNORDER:
2068                 PCM_ACQUIRE_QUICK(d);
2069                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2070                 PCM_RELEASE_QUICK(d);
2071                 break;
2072         case SNDCTL_DSP_SET_CHNORDER:
2073                 PCM_ACQUIRE_QUICK(d);
2074                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2075                 PCM_RELEASE_QUICK(d);
2076                 break;
2077         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2078                 PCM_ACQUIRE_QUICK(d);
2079                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2080                 PCM_RELEASE_QUICK(d);
2081                 break;
2082         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2083                 ret = EINVAL;
2084                 break;
2085 #ifdef  OSSV4_EXPERIMENT
2086         /*
2087          * XXX The following ioctls are not yet supported and just return
2088          * EINVAL.
2089          */
2090         case SNDCTL_DSP_GETOPEAKS:
2091         case SNDCTL_DSP_GETIPEAKS:
2092                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2093                 if (chn == NULL)
2094                         ret = EINVAL;
2095                 else {
2096                         oss_peaks_t *op = (oss_peaks_t *)arg;
2097                         int lpeak, rpeak;
2098
2099                         CHN_LOCK(chn);
2100                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2101                         if (ret == -1)
2102                                 ret = EINVAL;
2103                         else {
2104                                 (*op)[0] = lpeak;
2105                                 (*op)[1] = rpeak;
2106                         }
2107                         CHN_UNLOCK(chn);
2108                 }
2109                 break;
2110
2111         /*
2112          * XXX Once implemented, revisit this for proper cv protection
2113          *     (if necessary).
2114          */
2115         case SNDCTL_GETLABEL:
2116                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2117                 break;
2118         case SNDCTL_SETLABEL:
2119                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2120                 break;
2121         case SNDCTL_GETSONG:
2122                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2123                 break;
2124         case SNDCTL_SETSONG:
2125                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2126                 break;
2127         case SNDCTL_SETNAME:
2128                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2129                 break;
2130 #if 0
2131         /**
2132          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2133          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2134          * 4Front Technologies.
2135          */
2136         case SNDCTL_DSP_READCTL:
2137         case SNDCTL_DSP_WRITECTL:
2138                 ret = EINVAL;
2139                 break;
2140 #endif  /* !0 (explicitly omitted ioctls) */
2141
2142 #endif  /* !OSSV4_EXPERIMENT */
2143         case SNDCTL_DSP_MAPINBUF:
2144         case SNDCTL_DSP_MAPOUTBUF:
2145         case SNDCTL_DSP_SETSYNCRO:
2146                 /* undocumented */
2147
2148         case SNDCTL_DSP_SUBDIVIDE:
2149         case SOUND_PCM_WRITE_FILTER:
2150         case SOUND_PCM_READ_FILTER:
2151                 /* dunno what these do, don't sound important */
2152
2153         default:
2154                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2155                 ret = EINVAL;
2156                 break;
2157         }
2158
2159         PCM_GIANT_LEAVE(d);
2160
2161         return (ret);
2162 }
2163
2164 static int
2165 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2166 {
2167         struct snddev_info *d;
2168         struct pcm_channel *wrch, *rdch;
2169         int ret, e;
2170
2171         d = dsp_get_info(i_dev);
2172         if (!DSP_REGISTERED(d, i_dev))
2173                 return (EBADF);
2174
2175         PCM_GIANT_ENTER(d);
2176
2177         wrch = NULL;
2178         rdch = NULL;
2179         ret = 0;
2180
2181         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2182
2183         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2184                 e = (events & (POLLOUT | POLLWRNORM));
2185                 if (e)
2186                         ret |= chn_poll(wrch, e, td);
2187         }
2188
2189         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2190                 e = (events & (POLLIN | POLLRDNORM));
2191                 if (e)
2192                         ret |= chn_poll(rdch, e, td);
2193         }
2194
2195         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2196
2197         PCM_GIANT_LEAVE(d);
2198
2199         return (ret);
2200 }
2201
2202 static int
2203 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
2204     int nprot, vm_memattr_t *memattr)
2205 {
2206
2207         /* XXX memattr is not honored */
2208         *paddr = vtophys(offset);
2209         return (0);
2210 }
2211
2212 static int
2213 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
2214     vm_size_t size, struct vm_object **object, int nprot)
2215 {
2216         struct snddev_info *d;
2217         struct pcm_channel *wrch, *rdch, *c;
2218
2219         /*
2220          * Reject PROT_EXEC by default. It just doesn't makes sense.
2221          * Unfortunately, we have to give up this one due to linux_mmap
2222          * changes.
2223          *
2224          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2225          *
2226          */
2227 #ifdef SV_ABI_LINUX
2228         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2229             (dsp_mmap_allow_prot_exec == 0 &&
2230             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2231 #else
2232         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2233 #endif
2234                 return (EINVAL);
2235
2236         /*
2237          * PROT_READ (alone) selects the input buffer.
2238          * PROT_WRITE (alone) selects the output buffer.
2239          * PROT_WRITE|PROT_READ together select the output buffer.
2240          */
2241         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2242                 return (EINVAL);
2243
2244         d = dsp_get_info(i_dev);
2245         if (!DSP_REGISTERED(d, i_dev))
2246                 return (EINVAL);
2247
2248         PCM_GIANT_ENTER(d);
2249
2250         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2251
2252         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2253         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2254             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2255             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2256             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2257                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2258                 PCM_GIANT_EXIT(d);
2259                 return (EINVAL);
2260         }
2261
2262         if (wrch != NULL)
2263                 wrch->flags |= CHN_F_MMAP;
2264         if (rdch != NULL)
2265                 rdch->flags |= CHN_F_MMAP;
2266
2267         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2268         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2269         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
2270             size, nprot, *offset, curthread->td_ucred);
2271
2272         PCM_GIANT_LEAVE(d);
2273
2274         if (*object == NULL)
2275                  return (EINVAL);
2276         return (0);
2277 }
2278
2279 /* So much for dev_stdclone() */
2280 static int
2281 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2282 {
2283         size_t len;
2284
2285         len = strlen(namep);
2286
2287         if (bcmp(name, namep, len) != 0)
2288                 return (ENODEV);
2289
2290         name += len;
2291
2292         if (isdigit(*name) == 0)
2293                 return (ENODEV);
2294
2295         len = strlen(sep);
2296
2297         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2298                 return (ENODEV);
2299
2300         for (*u = 0; isdigit(*name) != 0; name++) {
2301                 *u *= 10;
2302                 *u += *name - '0';
2303                 if (*u > dsp_umax)
2304                         return (ENODEV);
2305         }
2306
2307         if (*name == '\0')
2308                 return ((use_sep == 0) ? 0 : ENODEV);
2309
2310         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2311                 return (ENODEV);
2312
2313         name += len;
2314
2315         if (*name == '0' && name[1] != '\0')
2316                 return (ENODEV);
2317
2318         for (*c = 0; isdigit(*name) != 0; name++) {
2319                 *c *= 10;
2320                 *c += *name - '0';
2321                 if (*c > dsp_cmax)
2322                         return (ENODEV);
2323         }
2324
2325         if (*name != '\0')
2326                 return (ENODEV);
2327
2328         return (0);
2329 }
2330
2331 static void
2332 dsp_clone(void *arg,
2333 #if __FreeBSD_version >= 600034
2334     struct ucred *cred,
2335 #endif
2336     char *name, int namelen, struct cdev **dev)
2337 {
2338         struct snddev_info *d;
2339         struct snd_clone_entry *ce;
2340         struct pcm_channel *c;
2341         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2342         char *devname, *devcmp, *devsep;
2343
2344         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2345
2346         if (*dev != NULL)
2347                 return;
2348
2349         unit = -1;
2350         cunit = -1;
2351         devtype = -1;
2352         devhw = 0;
2353         devcmax = -1;
2354         tumax = -1;
2355         devname = NULL;
2356         devsep = NULL;
2357
2358         for (i = 0; unit == -1 &&
2359             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2360                 devtype = dsp_cdevs[i].type;
2361                 devcmp = dsp_cdevs[i].name;
2362                 devsep = dsp_cdevs[i].sep;
2363                 devname = dsp_cdevs[i].alias;
2364                 if (devname == NULL)
2365                         devname = devcmp;
2366                 devhw = dsp_cdevs[i].hw;
2367                 devcmax = dsp_cdevs[i].max - 1;
2368                 if (strcmp(name, devcmp) == 0) {
2369                         if (dsp_basename_clone != 0)
2370                                 unit = snd_unit;
2371                 } else if (dsp_stdclone(name, devcmp, devsep,
2372                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2373                         unit = -1;
2374                         cunit = -1;
2375                 }
2376         }
2377
2378         d = devclass_get_softc(pcm_devclass, unit);
2379         if (!PCM_REGISTERED(d) || d->clones == NULL)
2380                 return;
2381
2382         /* XXX Need Giant magic entry ??? */
2383
2384         PCM_LOCK(d);
2385         if (snd_clone_disabled(d->clones)) {
2386                 PCM_UNLOCK(d);
2387                 return;
2388         }
2389
2390         PCM_WAIT(d);
2391         PCM_ACQUIRE(d);
2392         PCM_UNLOCK(d);
2393
2394         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2395
2396         if (devhw != 0) {
2397                 KASSERT(devcmax <= dsp_cmax,
2398                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2399                 if (cunit > devcmax) {
2400                         PCM_RELEASE_QUICK(d);
2401                         return;
2402                 }
2403                 udcmask |= snd_c2unit(cunit);
2404                 CHN_FOREACH(c, d, channels.pcm) {
2405                         CHN_LOCK(c);
2406                         if (c->unit != udcmask) {
2407                                 CHN_UNLOCK(c);
2408                                 continue;
2409                         }
2410                         CHN_UNLOCK(c);
2411                         udcmask &= ~snd_c2unit(cunit);
2412                         /*
2413                          * Temporarily increase clone maxunit to overcome
2414                          * vchan flexibility.
2415                          *
2416                          * # sysctl dev.pcm.0.play.vchans=256
2417                          * dev.pcm.0.play.vchans: 1 -> 256
2418                          * # cat /dev/zero > /dev/dsp0.vp255 &
2419                          * [1] 17296
2420                          * # sysctl dev.pcm.0.play.vchans=0
2421                          * dev.pcm.0.play.vchans: 256 -> 1
2422                          * # fg
2423                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2424                          * ^C
2425                          * # cat /dev/zero > /dev/dsp0.vp255
2426                          * zsh: operation not supported: /dev/dsp0.vp255
2427                          */
2428                         tumax = snd_clone_getmaxunit(d->clones);
2429                         if (cunit > tumax)
2430                                 snd_clone_setmaxunit(d->clones, cunit);
2431                         else
2432                                 tumax = -1;
2433                         goto dsp_clone_alloc;
2434                 }
2435                 /*
2436                  * Ok, so we're requesting unallocated vchan, but still
2437                  * within maximum vchan limit.
2438                  */
2439                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2440                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2441                     cunit < snd_maxautovchans) {
2442                         udcmask &= ~snd_c2unit(cunit);
2443                         tumax = snd_clone_getmaxunit(d->clones);
2444                         if (cunit > tumax)
2445                                 snd_clone_setmaxunit(d->clones, cunit);
2446                         else
2447                                 tumax = -1;
2448                         goto dsp_clone_alloc;
2449                 }
2450                 PCM_RELEASE_QUICK(d);
2451                 return;
2452         }
2453
2454 dsp_clone_alloc:
2455         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2456         if (tumax != -1)
2457                 snd_clone_setmaxunit(d->clones, tumax);
2458         if (ce != NULL) {
2459                 udcmask |= snd_c2unit(cunit);
2460                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2461                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2462                     devname, unit, devsep, cunit);
2463                 snd_clone_register(ce, *dev);
2464         }
2465
2466         PCM_RELEASE_QUICK(d);
2467
2468         if (*dev != NULL)
2469                 dev_ref(*dev);
2470 }
2471
2472 static void
2473 dsp_sysinit(void *p)
2474 {
2475         if (dsp_ehtag != NULL)
2476                 return;
2477         /* initialize unit numbering */
2478         snd_unit_init();
2479         dsp_umax = PCMMAXUNIT;
2480         dsp_cmax = PCMMAXCHAN;
2481         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2482 }
2483
2484 static void
2485 dsp_sysuninit(void *p)
2486 {
2487         if (dsp_ehtag == NULL)
2488                 return;
2489         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2490         dsp_ehtag = NULL;
2491 }
2492
2493 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2494 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2495
2496 char *
2497 dsp_unit2name(char *buf, size_t len, int unit)
2498 {
2499         int i, dtype;
2500
2501         KASSERT(buf != NULL && len != 0,
2502             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2503
2504         dtype = snd_unit2d(unit);
2505
2506         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2507                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2508                         continue;
2509                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2510                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2511                 return (buf);
2512         }
2513
2514         return (NULL);
2515 }
2516
2517 /**
2518  * @brief Handler for SNDCTL_AUDIOINFO.
2519  *
2520  * Gathers information about the audio device specified in ai->dev.  If
2521  * ai->dev == -1, then this function gathers information about the current
2522  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2523  * return EINVAL.
2524  *
2525  * This routine is supposed to go practically straight to the hardware,
2526  * getting capabilities directly from the sound card driver, side-stepping
2527  * the intermediate channel interface.
2528  *
2529  * Note, however, that the usefulness of this command is significantly
2530  * decreased when requesting info about any device other than the one serving
2531  * the request. While each snddev_channel refers to a specific device node,
2532  * the converse is *not* true.  Currently, when a sound device node is opened,
2533  * the sound subsystem scans for an available audio channel (or channels, if
2534  * opened in read+write) and then assigns them to the si_drv[12] private
2535  * data fields.  As a result, any information returned linking a channel to
2536  * a specific character device isn't necessarily accurate.
2537  *
2538  * @note
2539  * Calling threads must not hold any snddev_info or pcm_channel locks.
2540  *
2541  * @param dev           device on which the ioctl was issued
2542  * @param ai            ioctl request data container
2543  *
2544  * @retval 0            success
2545  * @retval EINVAL       ai->dev specifies an invalid device
2546  *
2547  * @todo Verify correctness of Doxygen tags.  ;)
2548  */
2549 int
2550 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2551 {
2552         struct pcmchan_caps *caps;
2553         struct pcm_channel *ch;
2554         struct snddev_info *d;
2555         uint32_t fmts;
2556         int i, nchan, *rates, minch, maxch;
2557         char *devname, buf[CHN_NAMELEN];
2558
2559         /*
2560          * If probing the device that received the ioctl, make sure it's a
2561          * DSP device.  (Users may use this ioctl with /dev/mixer and
2562          * /dev/midi.)
2563          */
2564         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2565                 return (EINVAL);
2566
2567         ch = NULL;
2568         devname = NULL;
2569         nchan = 0;
2570         bzero(buf, sizeof(buf));
2571
2572         /*
2573          * Search for the requested audio device (channel).  Start by
2574          * iterating over pcm devices.
2575          */
2576         for (i = 0; pcm_devclass != NULL &&
2577             i < devclass_get_maxunit(pcm_devclass); i++) {
2578                 d = devclass_get_softc(pcm_devclass, i);
2579                 if (!PCM_REGISTERED(d))
2580                         continue;
2581
2582                 /* XXX Need Giant magic entry ??? */
2583
2584                 /* See the note in function docblock */
2585                 PCM_UNLOCKASSERT(d);
2586                 PCM_LOCK(d);
2587
2588                 CHN_FOREACH(ch, d, channels.pcm) {
2589                         CHN_UNLOCKASSERT(ch);
2590                         CHN_LOCK(ch);
2591                         if (ai->dev == -1) {
2592                                 if (DSP_REGISTERED(d, i_dev) &&
2593                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2594                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2595                                         devname = dsp_unit2name(buf,
2596                                             sizeof(buf), ch->unit);
2597                                 }
2598                         } else if (ai->dev == nchan) {
2599                                 devname = dsp_unit2name(buf, sizeof(buf),
2600                                     ch->unit);
2601                         }
2602                         if (devname != NULL)
2603                                 break;
2604                         CHN_UNLOCK(ch);
2605                         ++nchan;
2606                 }
2607
2608                 if (devname != NULL) {
2609                         /*
2610                          * At this point, the following synchronization stuff
2611                          * has happened:
2612                          * - a specific PCM device is locked.
2613                          * - a specific audio channel has been locked, so be
2614                          *   sure to unlock when exiting;
2615                          */
2616
2617                         caps = chn_getcaps(ch);
2618
2619                         /*
2620                          * With all handles collected, zero out the user's
2621                          * container and begin filling in its fields.
2622                          */
2623                         bzero((void *)ai, sizeof(oss_audioinfo));
2624
2625                         ai->dev = nchan;
2626                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2627
2628                         if ((ch->flags & CHN_F_BUSY) == 0)
2629                                 ai->busy = 0;
2630                         else
2631                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2632
2633                         /**
2634                          * @note
2635                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2636                          *    this moment." Cop-out, I know, but I'll save
2637                          *    running around in the process table for later.
2638                          *    Is there a risk of leaking information?
2639                          */
2640                         ai->pid = ch->pid;
2641
2642                         /*
2643                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2644                          * Note, however, that a single channel operates in
2645                          * only one direction, so PCM_CAP_DUPLEX is out.
2646                          */
2647                         /**
2648                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2649                          *       these in pcmchan::caps?
2650                          */
2651                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2652                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2653
2654                         /*
2655                          * Collect formats supported @b natively by the
2656                          * device.  Also determine min/max channels.  (I.e.,
2657                          * mono, stereo, or both?)
2658                          *
2659                          * If any channel is stereo, maxch = 2;
2660                          * if all channels are stereo, minch = 2, too;
2661                          * if any channel is mono, minch = 1;
2662                          * and if all channels are mono, maxch = 1.
2663                          */
2664                         minch = 0;
2665                         maxch = 0;
2666                         fmts = 0;
2667                         for (i = 0; caps->fmtlist[i]; i++) {
2668                                 fmts |= caps->fmtlist[i];
2669                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2670                                         minch = (minch == 0) ? 2 : minch;
2671                                         maxch = 2;
2672                                 } else {
2673                                         minch = 1;
2674                                         maxch = (maxch == 0) ? 1 : maxch;
2675                                 }
2676                         }
2677
2678                         if (ch->direction == PCMDIR_PLAY)
2679                                 ai->oformats = fmts;
2680                         else
2681                                 ai->iformats = fmts;
2682
2683                         /**
2684                          * @note
2685                          * @c magic - OSSv4 docs: "Reserved for internal use
2686                          *    by OSS."
2687                          *
2688                          * @par
2689                          * @c card_number - OSSv4 docs: "Number of the sound
2690                          *    card where this device belongs or -1 if this
2691                          *    information is not available.  Applications
2692                          *    should normally not use this field for any
2693                          *    purpose."
2694                          */
2695                         ai->card_number = -1;
2696                         /**
2697                          * @todo @c song_name - depends first on
2698                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2699                          *          on SNDCTL_[GS]ETLABEL
2700                          * @todo @c port_number - routing information?
2701                          */
2702                         ai->port_number = -1;
2703                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2704                         /**
2705                          * @note
2706                          * @c real_device - OSSv4 docs:  "Obsolete."
2707                          */
2708                         ai->real_device = -1;
2709                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2710                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2711                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2712                         /**
2713                          * @note
2714                          * @c flags - OSSv4 docs: "Reserved for future use."
2715                          *
2716                          * @note
2717                          * @c binding - OSSv4 docs: "Reserved for future use."
2718                          *
2719                          * @todo @c handle - haven't decided how to generate
2720                          *       this yet; bus, vendor, device IDs?
2721                          */
2722                         ai->min_rate = caps->minspeed;
2723                         ai->max_rate = caps->maxspeed;
2724
2725                         ai->min_channels = minch;
2726                         ai->max_channels = maxch;
2727
2728                         ai->nrates = chn_getrates(ch, &rates);
2729                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2730                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2731
2732                         for (i = 0; i < ai->nrates; i++)
2733                                 ai->rates[i] = rates[i];
2734
2735                         ai->next_play_engine = 0;
2736                         ai->next_rec_engine = 0;
2737
2738                         CHN_UNLOCK(ch);
2739                 }
2740
2741                 PCM_UNLOCK(d);
2742
2743                 if (devname != NULL)
2744                         return (0);
2745         }
2746
2747         /* Exhausted the search -- nothing is locked, so return. */
2748         return (EINVAL);
2749 }
2750
2751 /**
2752  * @brief Assigns a PCM channel to a sync group.
2753  *
2754  * Sync groups are used to enable audio operations on multiple devices
2755  * simultaneously.  They may be used with any number of devices and may
2756  * span across applications.  Devices are added to groups with
2757  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2758  * SNDCTL_DSP_SYNCSTART ioctl.
2759  *
2760  * If the @c id field of the @c group parameter is set to zero, then a new
2761  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2762  * the group specified.
2763  *
2764  * @todo As far as memory allocation, should we assume that things are
2765  *       okay and allocate with M_WAITOK before acquiring channel locks,
2766  *       freeing later if not?
2767  *
2768  * @param wrch  output channel associated w/ device (if any)
2769  * @param rdch  input channel associated w/ device (if any)
2770  * @param group Sync group parameters
2771  *
2772  * @retval 0            success
2773  * @retval non-zero     error to be propagated upstream
2774  */
2775 static int
2776 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2777 {
2778         struct pcmchan_syncmember *smrd, *smwr;
2779         struct pcmchan_syncgroup *sg;
2780         int ret, sg_ids[3];
2781
2782         smrd = NULL;
2783         smwr = NULL;
2784         sg = NULL;
2785         ret = 0;
2786
2787         /*
2788          * Free_unr() may sleep, so store released syncgroup IDs until after
2789          * all locks are released.
2790          */
2791         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2792
2793         PCM_SG_LOCK();
2794
2795         /*
2796          * - Insert channel(s) into group's member list.
2797          * - Set CHN_F_NOTRIGGER on channel(s).
2798          * - Stop channel(s).
2799          */
2800
2801         /*
2802          * If device's channels are already mapped to a group, unmap them.
2803          */
2804         if (wrch) {
2805                 CHN_LOCK(wrch);
2806                 sg_ids[0] = chn_syncdestroy(wrch);
2807         }
2808
2809         if (rdch) {
2810                 CHN_LOCK(rdch);
2811                 sg_ids[1] = chn_syncdestroy(rdch);
2812         }
2813
2814         /*
2815          * Verify that mode matches character device properites.
2816          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2817          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2818          */
2819         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2820             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2821                 ret = EINVAL;
2822                 goto out;
2823         }
2824
2825         /*
2826          * An id of zero indicates the user wants to create a new
2827          * syncgroup.
2828          */
2829         if (group->id == 0) {
2830                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2831                 if (sg != NULL) {
2832                         SLIST_INIT(&sg->members);
2833                         sg->id = alloc_unr(pcmsg_unrhdr);
2834
2835                         group->id = sg->id;
2836                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2837                 } else
2838                         ret = ENOMEM;
2839         } else {
2840                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2841                         if (sg->id == group->id)
2842                                 break;
2843                 }
2844                 if (sg == NULL)
2845                         ret = EINVAL;
2846         }
2847
2848         /* Couldn't create or find a syncgroup.  Fail. */
2849         if (sg == NULL)
2850                 goto out;
2851
2852         /*
2853          * Allocate a syncmember, assign it and a channel together, and
2854          * insert into syncgroup.
2855          */
2856         if (group->mode & PCM_ENABLE_INPUT) {
2857                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2858                 if (smrd == NULL) {
2859                         ret = ENOMEM;
2860                         goto out;
2861                 }
2862
2863                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2864                 smrd->parent = sg;
2865                 smrd->ch = rdch;
2866
2867                 chn_abort(rdch);
2868                 rdch->flags |= CHN_F_NOTRIGGER;
2869                 rdch->sm = smrd;
2870         }
2871
2872         if (group->mode & PCM_ENABLE_OUTPUT) {
2873                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2874                 if (smwr == NULL) {
2875                         ret = ENOMEM;
2876                         goto out;
2877                 }
2878
2879                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2880                 smwr->parent = sg;
2881                 smwr->ch = wrch;
2882
2883                 chn_abort(wrch);
2884                 wrch->flags |= CHN_F_NOTRIGGER;
2885                 wrch->sm = smwr;
2886         }
2887
2888
2889 out:
2890         if (ret != 0) {
2891                 if (smrd != NULL)
2892                         free(smrd, M_DEVBUF);
2893                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2894                         sg_ids[2] = sg->id;
2895                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2896                         free(sg, M_DEVBUF);
2897                 }
2898
2899                 if (wrch)
2900                         wrch->sm = NULL;
2901                 if (rdch)
2902                         rdch->sm = NULL;
2903         }
2904
2905         if (wrch)
2906                 CHN_UNLOCK(wrch);
2907         if (rdch)
2908                 CHN_UNLOCK(rdch);
2909
2910         PCM_SG_UNLOCK();
2911
2912         if (sg_ids[0])
2913                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2914         if (sg_ids[1])
2915                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2916         if (sg_ids[2])
2917                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2918
2919         return (ret);
2920 }
2921
2922 /**
2923  * @brief Launch a sync group into action
2924  *
2925  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2926  * iterates over all members, triggering them along the way.
2927  *
2928  * @note Caller must not hold any channel locks.
2929  *
2930  * @param sg_id sync group identifier
2931  *
2932  * @retval 0    success
2933  * @retval non-zero     error worthy of propagating upstream to user
2934  */
2935 static int
2936 dsp_oss_syncstart(int sg_id)
2937 {
2938         struct pcmchan_syncmember *sm, *sm_tmp;
2939         struct pcmchan_syncgroup *sg;
2940         struct pcm_channel *c;
2941         int ret, needlocks;
2942
2943         /* Get the synclists lock */
2944         PCM_SG_LOCK();
2945
2946         do {
2947                 ret = 0;
2948                 needlocks = 0;
2949
2950                 /* Search for syncgroup by ID */
2951                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2952                         if (sg->id == sg_id)
2953                                 break;
2954                 }
2955
2956                 /* Return EINVAL if not found */
2957                 if (sg == NULL) {
2958                         ret = EINVAL;
2959                         break;
2960                 }
2961
2962                 /* Any removals resulting in an empty group should've handled this */
2963                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2964
2965                 /*
2966                  * Attempt to lock all member channels - if any are already
2967                  * locked, unlock those acquired, sleep for a bit, and try
2968                  * again.
2969                  */
2970                 SLIST_FOREACH(sm, &sg->members, link) {
2971                         if (CHN_TRYLOCK(sm->ch) == 0) {
2972                                 int timo = hz * 5/1000;
2973                                 if (timo < 1)
2974                                         timo = 1;
2975
2976                                 /* Release all locked channels so far, retry */
2977                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2978                                         /* sm is the member already locked */
2979                                         if (sm == sm_tmp)
2980                                                 break;
2981                                         CHN_UNLOCK(sm_tmp->ch);
2982                                 }
2983
2984                                 /** @todo Is PRIBIO correct/ */
2985                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2986                                     PRIBIO | PCATCH, "pcmsg", timo);
2987                                 if (ret == EINTR || ret == ERESTART)
2988                                         break;
2989
2990                                 needlocks = 1;
2991                                 ret = 0; /* Assumes ret == EAGAIN... */
2992                         }
2993                 }
2994         } while (needlocks && ret == 0);
2995
2996         /* Proceed only if no errors encountered. */
2997         if (ret == 0) {
2998                 /* Launch channels */
2999                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
3000                         SLIST_REMOVE_HEAD(&sg->members, link);
3001
3002                         c = sm->ch;
3003                         c->sm = NULL;
3004                         chn_start(c, 1);
3005                         c->flags &= ~CHN_F_NOTRIGGER;
3006                         CHN_UNLOCK(c);
3007
3008                         free(sm, M_DEVBUF);
3009                 }
3010
3011                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3012                 free(sg, M_DEVBUF);
3013         }
3014
3015         PCM_SG_UNLOCK();
3016
3017         /*
3018          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3019          * first.
3020          */
3021         if (ret == 0)
3022                 free_unr(pcmsg_unrhdr, sg_id);
3023
3024         return (ret);
3025 }
3026
3027 /**
3028  * @brief Handler for SNDCTL_DSP_POLICY
3029  *
3030  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3031  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3032  * specifying those two parameters, s/he simply selects a number from 0..10
3033  * which corresponds to a buffer size.  Smaller numbers request smaller
3034  * buffers with lower latencies (at greater overhead from more frequent
3035  * interrupts), while greater numbers behave in the opposite manner.
3036  *
3037  * The 4Front spec states that a value of 5 should be the default.  However,
3038  * this implementation deviates slightly by using a linear scale without
3039  * consulting drivers.  I.e., even though drivers may have different default
3040  * buffer sizes, a policy argument of 5 will have the same result across
3041  * all drivers.
3042  *
3043  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3044  * more information.
3045  *
3046  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3047  *       work with hardware drivers directly.
3048  *
3049  * @note PCM channel arguments must not be locked by caller.
3050  *
3051  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3052  * @param rdch  " recording channel (optional; may be NULL)
3053  * @param policy Integer from [0:10]
3054  *
3055  * @retval 0    constant (for now)
3056  */
3057 static int
3058 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3059 {
3060         int ret;
3061
3062         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3063                 return (EIO);
3064
3065         /* Default: success */
3066         ret = 0;
3067
3068         if (rdch) {
3069                 CHN_LOCK(rdch);
3070                 ret = chn_setlatency(rdch, policy);
3071                 CHN_UNLOCK(rdch);
3072         }
3073
3074         if (wrch && ret == 0) {
3075                 CHN_LOCK(wrch);
3076                 ret = chn_setlatency(wrch, policy);
3077                 CHN_UNLOCK(wrch);
3078         }
3079
3080         if (ret)
3081                 ret = EIO;
3082
3083         return (ret);
3084 }
3085
3086 /**
3087  * @brief Enable or disable "cooked" mode
3088  *
3089  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3090  * is the default, the sound system handles rate and format conversions
3091  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3092  * operates with 44100Hz/16bit/signed samples).
3093  *
3094  * Disabling cooked mode is intended for applications wanting to mmap()
3095  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3096  * feeder architecture, presumably to gain as much control over audio
3097  * hardware as possible.
3098  *
3099  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3100  * for more details.
3101  *
3102  * @param wrch          playback channel (optional; may be NULL)
3103  * @param rdch          recording channel (optional; may be NULL)
3104  * @param enabled       0 = raw mode, 1 = cooked mode
3105  *
3106  * @retval EINVAL       Operation not yet supported.
3107  */
3108 static int
3109 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3110 {
3111
3112         /*
3113          * XXX I just don't get it. Why don't they call it
3114          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3115          * This is just plain so confusing, incoherent,
3116          * <insert any non-printable characters here>.
3117          */
3118         if (!(enabled == 1 || enabled == 0))
3119                 return (EINVAL);
3120
3121         /*
3122          * I won't give in. I'm inverting its logic here and now.
3123          * Brag all you want, but "BITPERFECT" should be the better
3124          * term here.
3125          */
3126         enabled ^= 0x00000001;
3127
3128         if (wrch != NULL) {
3129                 CHN_LOCK(wrch);
3130                 wrch->flags &= ~CHN_F_BITPERFECT;
3131                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3132                 CHN_UNLOCK(wrch);
3133         }
3134
3135         if (rdch != NULL) {
3136                 CHN_LOCK(rdch);
3137                 rdch->flags &= ~CHN_F_BITPERFECT;
3138                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3139                 CHN_UNLOCK(rdch);
3140         }
3141
3142         return (0);
3143 }
3144
3145 /**
3146  * @brief Retrieve channel interleaving order
3147  *
3148  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3149  *
3150  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3151  * for more details.
3152  *
3153  * @note As the ioctl definition is still under construction, FreeBSD
3154  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3155  *
3156  * @param wrch  playback channel (optional; may be NULL)
3157  * @param rdch  recording channel (optional; may be NULL)
3158  * @param map   channel map (result will be stored there)
3159  *
3160  * @retval EINVAL       Operation not yet supported.
3161  */
3162 static int
3163 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3164 {
3165         struct pcm_channel *ch;
3166         int ret;
3167
3168         ch = (wrch != NULL) ? wrch : rdch;
3169         if (ch != NULL) {
3170                 CHN_LOCK(ch);
3171                 ret = chn_oss_getorder(ch, map);
3172                 CHN_UNLOCK(ch);
3173         } else
3174                 ret = EINVAL;
3175
3176         return (ret);
3177 }
3178
3179 /**
3180  * @brief Specify channel interleaving order
3181  *
3182  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3183  *
3184  * @note As the ioctl definition is still under construction, FreeBSD
3185  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3186  *
3187  * @param wrch  playback channel (optional; may be NULL)
3188  * @param rdch  recording channel (optional; may be NULL)
3189  * @param map   channel map
3190  *
3191  * @retval EINVAL       Operation not yet supported.
3192  */
3193 static int
3194 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3195 {
3196         int ret;
3197
3198         ret = 0;
3199
3200         if (wrch != NULL) {
3201                 CHN_LOCK(wrch);
3202                 ret = chn_oss_setorder(wrch, map);
3203                 CHN_UNLOCK(wrch);
3204         }
3205
3206         if (ret == 0 && rdch != NULL) {
3207                 CHN_LOCK(rdch);
3208                 ret = chn_oss_setorder(rdch, map);
3209                 CHN_UNLOCK(rdch);
3210         }
3211
3212         return (ret);
3213 }
3214
3215 static int
3216 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3217     int *mask)
3218 {
3219         struct pcm_channel *ch;
3220         uint32_t chnmask;
3221         int ret;
3222
3223         chnmask = 0;
3224         ch = (wrch != NULL) ? wrch : rdch;
3225
3226         if (ch != NULL) {
3227                 CHN_LOCK(ch);
3228                 ret = chn_oss_getmask(ch, &chnmask);
3229                 CHN_UNLOCK(ch);
3230         } else
3231                 ret = EINVAL;
3232
3233         if (ret == 0)
3234                 *mask = chnmask;
3235
3236         return (ret);
3237 }
3238
3239 #ifdef OSSV4_EXPERIMENT
3240 /**
3241  * @brief Retrieve an audio device's label
3242  *
3243  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3244  *
3245  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3246  * for more details.
3247  *
3248  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3249  * consoles) can show variable "labels" for certain controls. By default
3250  * the application name (say quake) is shown as the label but
3251  * applications may change the labels themselves."
3252  *
3253  * @note As the ioctl definition is still under construction, FreeBSD
3254  *       does not currently support @c SNDCTL_GETLABEL.
3255  *
3256  * @param wrch  playback channel (optional; may be NULL)
3257  * @param rdch  recording channel (optional; may be NULL)
3258  * @param label label gets copied here
3259  *
3260  * @retval EINVAL       Operation not yet supported.
3261  */
3262 static int
3263 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3264 {
3265         return (EINVAL);
3266 }
3267
3268 /**
3269  * @brief Specify an audio device's label
3270  *
3271  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3272  * comments for @c dsp_oss_getlabel immediately above.
3273  *
3274  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3275  * for more details.
3276  *
3277  * @note As the ioctl definition is still under construction, FreeBSD
3278  *       does not currently support SNDCTL_SETLABEL.
3279  *
3280  * @param wrch  playback channel (optional; may be NULL)
3281  * @param rdch  recording channel (optional; may be NULL)
3282  * @param label label gets copied from here
3283  *
3284  * @retval EINVAL       Operation not yet supported.
3285  */
3286 static int
3287 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
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_GETSONG 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_GETSONG.html
3300  * for more details.
3301  *
3302  * @note As the ioctl definition is still under construction, FreeBSD
3303  *       does not currently support SNDCTL_GETSONG.
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 here
3308  *
3309  * @retval EINVAL       Operation not yet supported.
3310  */
3311 static int
3312 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3313 {
3314         return (EINVAL);
3315 }
3316
3317 /**
3318  * @brief Retrieve name of currently played song
3319  *
3320  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3321  * tell the system the name of the currently playing song, which would be
3322  * visible in @c /dev/sndstat.
3323  *
3324  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3325  * for more details.
3326  *
3327  * @note As the ioctl definition is still under construction, FreeBSD
3328  *       does not currently support SNDCTL_SETSONG.
3329  *
3330  * @param wrch  playback channel (optional; may be NULL)
3331  * @param rdch  recording channel (optional; may be NULL)
3332  * @param song  song name gets copied from here
3333  *
3334  * @retval EINVAL       Operation not yet supported.
3335  */
3336 static int
3337 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3338 {
3339         return (EINVAL);
3340 }
3341
3342 /**
3343  * @brief Rename a device
3344  *
3345  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3346  *
3347  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3348  * more details.
3349  *
3350  * From Hannu@4Front:  "This call is used to change the device name
3351  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3352  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3353  * name depending on the current context (for example 'OSS virtual wave table
3354  * synth' or 'VoIP link to London')."
3355  *
3356  * @note As the ioctl definition is still under construction, FreeBSD
3357  *       does not currently support SNDCTL_SETNAME.
3358  *
3359  * @param wrch  playback channel (optional; may be NULL)
3360  * @param rdch  recording channel (optional; may be NULL)
3361  * @param name  new device name gets copied from here
3362  *
3363  * @retval EINVAL       Operation not yet supported.
3364  */
3365 static int
3366 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3367 {
3368         return (EINVAL);
3369 }
3370 #endif  /* !OSSV4_EXPERIMENT */