sys/dev/sound/pcm/dsp.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
   5  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
   6  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #ifdef HAVE_KERNEL_OPTION_HEADERS
  32 #include "opt_snd.h"
  33 #endif
  34
  35 #include <dev/sound/pcm/sound.h>
  36 #include <sys/ctype.h>
  37 #include <sys/lock.h>
  38 #include <sys/rwlock.h>
  39 #include <sys/sysent.h>
  40
  41 #include <vm/vm.h>
  42 #include <vm/vm_object.h>
  43 #include <vm/vm_page.h>
  44 #include <vm/vm_pager.h>
  45
  46 SND_DECLARE_FILE("$FreeBSD$");
  47
  48 static int dsp_mmap_allow_prot_exec = 0;
  49 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RWTUN,
  50     &dsp_mmap_allow_prot_exec, 0,
  51     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
  52
  53 static int dsp_basename_clone = 1;
  54 SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
  55     &dsp_basename_clone, 0,
  56     "DSP basename cloning (0: Disable; 1: Enabled)");
  57
  58 struct dsp_cdevinfo {
  59         struct pcm_channel *rdch, *wrch;
  60         struct pcm_channel *volch;
  61         int busy, simplex;
  62         TAILQ_ENTRY(dsp_cdevinfo) link;
  63 };
  64
  65 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  66 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  67 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  68 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  69
  70 #define DSP_CDEVINFO_CACHESIZE  8
  71
  72 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  73                                  (y) != NULL && (y)->si_drv1 != NULL)
  74
  75 #define OLDPCM_IOCTL
  76
  77 static d_open_t dsp_open;
  78 static d_close_t dsp_close;
  79 static d_read_t dsp_read;
  80 static d_write_t dsp_write;
  81 static d_ioctl_t dsp_ioctl;
  82 static d_poll_t dsp_poll;
  83 static d_mmap_t dsp_mmap;
  84 static d_mmap_single_t dsp_mmap_single;
  85
  86 struct cdevsw dsp_cdevsw = {
  87         .d_version =    D_VERSION,
  88         .d_open =       dsp_open,
  89         .d_close =      dsp_close,
  90         .d_read =       dsp_read,
  91         .d_write =      dsp_write,
  92         .d_ioctl =      dsp_ioctl,
  93         .d_poll =       dsp_poll,
  94         .d_mmap =       dsp_mmap,
  95         .d_mmap_single = dsp_mmap_single,
  96         .d_name =       "dsp",
  97 };
  98
  99 static eventhandler_tag dsp_ehtag = NULL;
 100 static int dsp_umax = -1;
 101 static int dsp_cmax = -1;
 102
 103 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
 104 static int dsp_oss_syncstart(int sg_id);
 105 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
 106 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
 107 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 108 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 109 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
 110 #ifdef OSSV4_EXPERIMENT
 111 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 112 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 113 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 114 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 115 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 116 #endif
 117
 118 static struct snddev_info *
 119 dsp_get_info(struct cdev *dev)
 120 {
 121         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 122 }
 123
 124 static uint32_t
 125 dsp_get_flags(struct cdev *dev)
 126 {
 127         device_t bdev;
 128
 129         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 130
 131         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 132 }
 133
 134 static void
 135 dsp_set_flags(struct cdev *dev, uint32_t flags)
 136 {
 137         device_t bdev;
 138
 139         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 140
 141         if (bdev != NULL)
 142                 pcm_setflags(bdev, flags);
 143 }
 144
 145 /*
 146  * return the channels associated with an open device instance.
 147  * lock channels specified.
 148  */
 149 static int
 150 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 151     uint32_t prio)
 152 {
 153         struct snddev_info *d;
 154         struct pcm_channel *ch;
 155         uint32_t flags;
 156
 157         if (PCM_SIMPLEX(dev) != 0) {
 158                 d = dsp_get_info(dev);
 159                 if (!PCM_REGISTERED(d))
 160                         return (ENXIO);
 161                 PCM_LOCK(d);
 162                 PCM_WAIT(d);
 163                 PCM_ACQUIRE(d);
 164                 /*
 165                  * Note: order is important -
 166                  *       pcm flags -> prio query flags -> wild guess
 167                  */
 168                 ch = NULL;
 169                 flags = dsp_get_flags(dev);
 170                 if (flags & SD_F_PRIO_WR) {
 171                         ch = PCM_RDCH(dev);
 172                         PCM_RDCH(dev) = NULL;
 173                 } else if (flags & SD_F_PRIO_RD) {
 174                         ch = PCM_WRCH(dev);
 175                         PCM_WRCH(dev) = NULL;
 176                 } else if (prio & SD_F_PRIO_WR) {
 177                         ch = PCM_RDCH(dev);
 178                         PCM_RDCH(dev) = NULL;
 179                         flags |= SD_F_PRIO_WR;
 180                 } else if (prio & SD_F_PRIO_RD) {
 181                         ch = PCM_WRCH(dev);
 182                         PCM_WRCH(dev) = NULL;
 183                         flags |= SD_F_PRIO_RD;
 184                 } else if (PCM_WRCH(dev) != NULL) {
 185                         ch = PCM_RDCH(dev);
 186                         PCM_RDCH(dev) = NULL;
 187                         flags |= SD_F_PRIO_WR;
 188                 } else if (PCM_RDCH(dev) != NULL) {
 189                         ch = PCM_WRCH(dev);
 190                         PCM_WRCH(dev) = NULL;
 191                         flags |= SD_F_PRIO_RD;
 192                 }
 193                 PCM_SIMPLEX(dev) = 0;
 194                 dsp_set_flags(dev, flags);
 195                 if (ch != NULL) {
 196                         CHN_LOCK(ch);
 197                         pcm_chnref(ch, -1);
 198                         pcm_chnrelease(ch);
 199                 }
 200                 PCM_RELEASE(d);
 201                 PCM_UNLOCK(d);
 202         }
 203
 204         *rdch = PCM_RDCH(dev);
 205         *wrch = PCM_WRCH(dev);
 206
 207         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 208                 CHN_LOCK(*rdch);
 209         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 210                 CHN_LOCK(*wrch);
 211
 212         return (0);
 213 }
 214
 215 /* unlock specified channels */
 216 static void
 217 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 218     uint32_t prio)
 219 {
 220         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 221                 CHN_UNLOCK(wrch);
 222         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 223                 CHN_UNLOCK(rdch);
 224 }
 225
 226 static void
 227 dsp_cdevinfo_alloc(struct cdev *dev,
 228     struct pcm_channel *rdch, struct pcm_channel *wrch,
 229     struct pcm_channel *volch)
 230 {
 231         struct snddev_info *d;
 232         struct dsp_cdevinfo *cdi;
 233         int simplex;
 234
 235         d = dsp_get_info(dev);
 236
 237         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 238             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 239             ("bogus %s(), what are you trying to accomplish here?", __func__));
 240         PCM_BUSYASSERT(d);
 241         PCM_LOCKASSERT(d);
 242
 243         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 244
 245         /*
 246          * Scan for free instance entry and put it into the end of list.
 247          * Create new one if necessary.
 248          */
 249         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 250                 if (cdi->busy != 0)
 251                         break;
 252                 cdi->rdch = rdch;
 253                 cdi->wrch = wrch;
 254                 cdi->volch = volch;
 255                 cdi->simplex = simplex;
 256                 cdi->busy = 1;
 257                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 258                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 259                 dev->si_drv1 = cdi;
 260                 return;
 261         }
 262         PCM_UNLOCK(d);
 263         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 264         PCM_LOCK(d);
 265         cdi->rdch = rdch;
 266         cdi->wrch = wrch;
 267         cdi->volch = volch;
 268         cdi->simplex = simplex;
 269         cdi->busy = 1;
 270         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 271         dev->si_drv1 = cdi;
 272 }
 273
 274 static void
 275 dsp_cdevinfo_free(struct cdev *dev)
 276 {
 277         struct snddev_info *d;
 278         struct dsp_cdevinfo *cdi, *tmp;
 279         uint32_t flags;
 280         int i;
 281
 282         d = dsp_get_info(dev);
 283
 284         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 285             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 286             PCM_VOLCH(dev) == NULL,
 287             ("bogus %s(), what are you trying to accomplish here?", __func__));
 288         PCM_BUSYASSERT(d);
 289         PCM_LOCKASSERT(d);
 290
 291         cdi = dev->si_drv1;
 292         dev->si_drv1 = NULL;
 293         cdi->rdch = NULL;
 294         cdi->wrch = NULL;
 295         cdi->volch = NULL;
 296         cdi->simplex = 0;
 297         cdi->busy = 0;
 298
 299         /*
 300          * Once it is free, move it back to the beginning of list for
 301          * faster new entry allocation.
 302          */
 303         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 304         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 305
 306         /*
 307          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 308          * Reset simplex flags.
 309          */
 310         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 311         i = DSP_CDEVINFO_CACHESIZE;
 312         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 313                 if (cdi->busy != 0) {
 314                         if (cdi->simplex == 0) {
 315                                 if (cdi->rdch != NULL)
 316                                         flags |= SD_F_PRIO_RD;
 317                                 if (cdi->wrch != NULL)
 318                                         flags |= SD_F_PRIO_WR;
 319                         }
 320                 } else {
 321                         if (i == 0) {
 322                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 323                                 free(cdi, M_DEVBUF);
 324                         } else
 325                                 i--;
 326                 }
 327         }
 328         dsp_set_flags(dev, flags);
 329 }
 330
 331 void
 332 dsp_cdevinfo_init(struct snddev_info *d)
 333 {
 334         struct dsp_cdevinfo *cdi;
 335         int i;
 336
 337         KASSERT(d != NULL, ("NULL snddev_info"));
 338         PCM_BUSYASSERT(d);
 339         PCM_UNLOCKASSERT(d);
 340
 341         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 342         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 343                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 344                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 345         }
 346 }
 347
 348 void
 349 dsp_cdevinfo_flush(struct snddev_info *d)
 350 {
 351         struct dsp_cdevinfo *cdi, *tmp;
 352
 353         KASSERT(d != NULL, ("NULL snddev_info"));
 354         PCM_BUSYASSERT(d);
 355         PCM_UNLOCKASSERT(d);
 356
 357         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 358         while (cdi != NULL) {
 359                 tmp = TAILQ_NEXT(cdi, link);
 360                 free(cdi, M_DEVBUF);
 361                 cdi = tmp;
 362         }
 363         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 364 }
 365
 366 /* duplex / simplex cdev type */
 367 enum {
 368         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 369         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 370         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 371 };
 372
 373 enum {
 374         DSP_CDEV_VOLCTL_NONE,
 375         DSP_CDEV_VOLCTL_READ,
 376         DSP_CDEV_VOLCTL_WRITE
 377 };
 378
 379 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 380 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 381 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 382 #define DSP_F_READ(x)           ((x) & FREAD)
 383 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 384
 385 static const struct {
 386         int type;
 387         char *name;
 388         char *sep;
 389         char *alias;
 390         int use_sep;
 391         int hw;
 392         int max;
 393         int volctl;
 394         uint32_t fmt, spd;
 395         int query;
 396 } dsp_cdevs[] = {
 397         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 398           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 399           DSP_CDEV_TYPE_RDWR },
 400         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 401           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 402           DSP_CDEV_TYPE_RDWR },
 403         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 404           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 405           DSP_CDEV_TYPE_RDWR },
 406         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 407           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 408         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 409           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 410         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 411           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 412         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 413           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 414         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 415           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 416         /* Low priority, OSSv4 aliases. */
 417         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
 418           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 419           DSP_CDEV_TYPE_RDWR },
 420         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
 421           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 422           DSP_CDEV_TYPE_RDWR },
 423         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
 424           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 425           DSP_CDEV_TYPE_RDWR },
 426         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
 427           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 428           DSP_CDEV_TYPE_RDWR },
 429         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
 430           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 431           DSP_CDEV_TYPE_RDWR },
 432 };
 433
 434 #define DSP_FIXUP_ERROR()               do {                            \
 435         prio = dsp_get_flags(i_dev);                                    \
 436         if (!DSP_F_VALID(flags))                                        \
 437                 error = EINVAL;                                         \
 438         if (!DSP_F_DUPLEX(flags) &&                                     \
 439             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 440             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 441                 error = ENOTSUP;                                        \
 442         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 443             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 444             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 445                 error = EBUSY;                                          \
 446         else if (DSP_REGISTERED(d, i_dev))                              \
 447                 error = EBUSY;                                          \
 448 } while (0)
 449
 450 static int
 451 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
 452 {
 453         struct pcm_channel *rdch, *wrch;
 454         struct snddev_info *d;
 455         uint32_t fmt, spd, prio, volctl;
 456         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 457
 458         /* Kind of impossible.. */
 459         if (i_dev == NULL || td == NULL)
 460                 return (ENODEV);
 461
 462         d = dsp_get_info(i_dev);
 463         if (!PCM_REGISTERED(d))
 464                 return (EBADF);
 465
 466         PCM_GIANT_ENTER(d);
 467
 468         /* Lock snddev so nobody else can monkey with it. */
 469         PCM_LOCK(d);
 470         PCM_WAIT(d);
 471
 472         /*
 473          * Try to acquire cloned device before someone else pick it.
 474          * ENODEV means this is not a cloned droids.
 475          */
 476         error = snd_clone_acquire(i_dev);
 477         if (!(error == 0 || error == ENODEV)) {
 478                 DSP_FIXUP_ERROR();
 479                 PCM_UNLOCK(d);
 480                 PCM_GIANT_EXIT(d);
 481                 return (error);
 482         }
 483
 484         error = 0;
 485         DSP_FIXUP_ERROR();
 486
 487         if (error != 0) {
 488                 (void)snd_clone_release(i_dev);
 489                 PCM_UNLOCK(d);
 490                 PCM_GIANT_EXIT(d);
 491                 return (error);
 492         }
 493
 494         /*
 495          * That is just enough. Acquire and unlock pcm lock so
 496          * the other will just have to wait until we finish doing
 497          * everything.
 498          */
 499         PCM_ACQUIRE(d);
 500         PCM_UNLOCK(d);
 501
 502         devtype = PCMDEV(i_dev);
 503         wdevunit = -1;
 504         rdevunit = -1;
 505         fmt = 0;
 506         spd = 0;
 507         volctl = DSP_CDEV_VOLCTL_NONE;
 508
 509         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 510                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 511                         continue;
 512                 /*
 513                  * Volume control only valid for DSPHW devices,
 514                  * and it must be opened in opposite direction be it
 515                  * simplex or duplex. Anything else will be handled
 516                  * as usual.
 517                  */
 518                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 519                         if (dsp_cdevs[i].volctl != 0 &&
 520                             DSP_F_READ(flags)) {
 521                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 522                                 flags &= ~FREAD;
 523                                 flags |= FWRITE;
 524                         }
 525                         if (DSP_F_READ(flags)) {
 526                                 (void)snd_clone_release(i_dev);
 527                                 PCM_RELEASE_QUICK(d);
 528                                 PCM_GIANT_EXIT(d);
 529                                 return (ENOTSUP);
 530                         }
 531                         wdevunit = dev2unit(i_dev);
 532                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 533                         if (dsp_cdevs[i].volctl != 0 &&
 534                             DSP_F_WRITE(flags)) {
 535                                 volctl = DSP_CDEV_VOLCTL_READ;
 536                                 flags &= ~FWRITE;
 537                                 flags |= FREAD;
 538                         }
 539                         if (DSP_F_WRITE(flags)) {
 540                                 (void)snd_clone_release(i_dev);
 541                                 PCM_RELEASE_QUICK(d);
 542                                 PCM_GIANT_EXIT(d);
 543                                 return (ENOTSUP);
 544                         }
 545                         rdevunit = dev2unit(i_dev);
 546                 }
 547                 fmt = dsp_cdevs[i].fmt;
 548                 spd = dsp_cdevs[i].spd;
 549                 break;
 550         }
 551
 552         /* No matching devtype? */
 553         if (fmt == 0 || spd == 0)
 554                 panic("impossible devtype %d", devtype);
 555
 556         rdch = NULL;
 557         wrch = NULL;
 558         rderror = 0;
 559         wrerror = 0;
 560
 561         /*
 562          * if we get here, the open request is valid- either:
 563          *   * we were previously not open
 564          *   * we were open for play xor record and the opener wants
 565          *     the non-open direction
 566          */
 567         if (DSP_F_READ(flags)) {
 568                 /* open for read */
 569                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 570                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
 571
 572                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 573                         rderror = ENXIO;
 574
 575                 if (volctl == DSP_CDEV_VOLCTL_READ)
 576                         rderror = 0;
 577
 578                 if (rderror != 0) {
 579                         if (rdch != NULL)
 580                                 pcm_chnrelease(rdch);
 581                         if (!DSP_F_DUPLEX(flags)) {
 582                                 (void)snd_clone_release(i_dev);
 583                                 PCM_RELEASE_QUICK(d);
 584                                 PCM_GIANT_EXIT(d);
 585                                 return (rderror);
 586                         }
 587                         rdch = NULL;
 588                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 589                         if (rdch != NULL) {
 590                                 pcm_chnref(rdch, 1);
 591                                 pcm_chnrelease(rdch);
 592                         }
 593                 } else {
 594                         if (flags & O_NONBLOCK)
 595                                 rdch->flags |= CHN_F_NBIO;
 596                         if (flags & O_EXCL)
 597                                 rdch->flags |= CHN_F_EXCLUSIVE;
 598                         pcm_chnref(rdch, 1);
 599                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 600                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 601                         CHN_UNLOCK(rdch);
 602                 }
 603         }
 604
 605         if (DSP_F_WRITE(flags)) {
 606                 /* open for write */
 607                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 608                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
 609
 610                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 611                         wrerror = ENXIO;
 612
 613                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 614                         wrerror = 0;
 615
 616                 if (wrerror != 0) {
 617                         if (wrch != NULL)
 618                                 pcm_chnrelease(wrch);
 619                         if (!DSP_F_DUPLEX(flags)) {
 620                                 if (rdch != NULL) {
 621                                         /*
 622                                          * Lock, deref and release previously
 623                                          * created record channel
 624                                          */
 625                                         CHN_LOCK(rdch);
 626                                         pcm_chnref(rdch, -1);
 627                                         pcm_chnrelease(rdch);
 628                                 }
 629                                 (void)snd_clone_release(i_dev);
 630                                 PCM_RELEASE_QUICK(d);
 631                                 PCM_GIANT_EXIT(d);
 632                                 return (wrerror);
 633                         }
 634                         wrch = NULL;
 635                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 636                         if (wrch != NULL) {
 637                                 pcm_chnref(wrch, 1);
 638                                 pcm_chnrelease(wrch);
 639                         }
 640                 } else {
 641                         if (flags & O_NONBLOCK)
 642                                 wrch->flags |= CHN_F_NBIO;
 643                         if (flags & O_EXCL)
 644                                 wrch->flags |= CHN_F_EXCLUSIVE;
 645                         pcm_chnref(wrch, 1);
 646                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 647                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 648                         CHN_UNLOCK(wrch);
 649                 }
 650         }
 651
 652
 653         PCM_LOCK(d);
 654
 655         /*
 656          * We're done. Allocate channels information for this cdev.
 657          */
 658         switch (volctl) {
 659         case DSP_CDEV_VOLCTL_READ:
 660                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 661                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 662                 break;
 663         case DSP_CDEV_VOLCTL_WRITE:
 664                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 665                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 666                 break;
 667         case DSP_CDEV_VOLCTL_NONE:
 668         default:
 669                 if (wrch == NULL && rdch == NULL) {
 670                         (void)snd_clone_release(i_dev);
 671                         PCM_RELEASE(d);
 672                         PCM_UNLOCK(d);
 673                         PCM_GIANT_EXIT(d);
 674                         if (wrerror != 0)
 675                                 return (wrerror);
 676                         if (rderror != 0)
 677                                 return (rderror);
 678                         return (EINVAL);
 679                 }
 680                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 681                 if (rdch != NULL)
 682                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 683                 if (wrch != NULL)
 684                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 685                 break;
 686         }
 687
 688         /*
 689          * Increase clone refcount for its automatic garbage collector.
 690          */
 691         (void)snd_clone_ref(i_dev);
 692
 693         PCM_RELEASE(d);
 694         PCM_UNLOCK(d);
 695
 696         PCM_GIANT_LEAVE(d);
 697
 698         return (0);
 699 }
 700
 701 static int
 702 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 703 {
 704         struct pcm_channel *rdch, *wrch, *volch;
 705         struct snddev_info *d;
 706         int sg_ids, rdref, wdref;
 707
 708         d = dsp_get_info(i_dev);
 709         if (!DSP_REGISTERED(d, i_dev))
 710                 return (EBADF);
 711
 712         PCM_GIANT_ENTER(d);
 713
 714         PCM_LOCK(d);
 715         PCM_WAIT(d);
 716         PCM_ACQUIRE(d);
 717
 718         rdch = PCM_RDCH(i_dev);
 719         wrch = PCM_WRCH(i_dev);
 720         volch = PCM_VOLCH(i_dev);
 721
 722         PCM_RDCH(i_dev) = NULL;
 723         PCM_WRCH(i_dev) = NULL;
 724         PCM_VOLCH(i_dev) = NULL;
 725
 726         rdref = -1;
 727         wdref = -1;
 728
 729         if (volch != NULL) {
 730                 if (volch == rdch)
 731                         rdref--;
 732                 else if (volch == wrch)
 733                         wdref--;
 734                 else {
 735                         CHN_LOCK(volch);
 736                         pcm_chnref(volch, -1);
 737                         CHN_UNLOCK(volch);
 738                 }
 739         }
 740
 741         if (rdch != NULL)
 742                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 743         if (wrch != NULL)
 744                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 745
 746         if (rdch != NULL || wrch != NULL) {
 747                 PCM_UNLOCK(d);
 748                 if (rdch != NULL) {
 749                         /*
 750                          * The channel itself need not be locked because:
 751                          *   a)  Adding a channel to a syncgroup happens only
 752                          *       in dsp_ioctl(), which cannot run concurrently
 753                          *       to dsp_close().
 754                          *   b)  The syncmember pointer (sm) is protected by
 755                          *       the global syncgroup list lock.
 756                          *   c)  A channel can't just disappear, invalidating
 757                          *       pointers, unless it's closed/dereferenced
 758                          *       first.
 759                          */
 760                         PCM_SG_LOCK();
 761                         sg_ids = chn_syncdestroy(rdch);
 762                         PCM_SG_UNLOCK();
 763                         if (sg_ids != 0)
 764                                 free_unr(pcmsg_unrhdr, sg_ids);
 765
 766                         CHN_LOCK(rdch);
 767                         pcm_chnref(rdch, rdref);
 768                         chn_abort(rdch); /* won't sleep */
 769                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 770                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 771                         chn_reset(rdch, 0, 0);
 772                         pcm_chnrelease(rdch);
 773                 }
 774                 if (wrch != NULL) {
 775                         /*
 776                          * Please see block above.
 777                          */
 778                         PCM_SG_LOCK();
 779                         sg_ids = chn_syncdestroy(wrch);
 780                         PCM_SG_UNLOCK();
 781                         if (sg_ids != 0)
 782                                 free_unr(pcmsg_unrhdr, sg_ids);
 783
 784                         CHN_LOCK(wrch);
 785                         pcm_chnref(wrch, wdref);
 786                         chn_flush(wrch); /* may sleep */
 787                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 788                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 789                         chn_reset(wrch, 0, 0);
 790                         pcm_chnrelease(wrch);
 791                 }
 792                 PCM_LOCK(d);
 793         }
 794
 795         dsp_cdevinfo_free(i_dev);
 796         /*
 797          * Release clone busy state and unref it so the automatic
 798          * garbage collector will get the hint and do the remaining
 799          * cleanup process.
 800          */
 801         (void)snd_clone_release(i_dev);
 802
 803         /*
 804          * destroy_dev() might sleep, so release pcm lock
 805          * here and rely on pcm cv serialization.
 806          */
 807         PCM_UNLOCK(d);
 808         (void)snd_clone_unref(i_dev);
 809         PCM_LOCK(d);
 810
 811         PCM_RELEASE(d);
 812         PCM_UNLOCK(d);
 813
 814         PCM_GIANT_LEAVE(d);
 815
 816         return (0);
 817 }
 818
 819 static __inline int
 820 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 821 {
 822         struct snddev_info *d;
 823         struct pcm_channel **ch, *rdch, *wrch;
 824         int (*chn_io)(struct pcm_channel *, struct uio *);
 825         int prio, ret;
 826         pid_t runpid;
 827
 828         KASSERT(i_dev != NULL && buf != NULL &&
 829             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 830             ("%s(): io train wreck!", __func__));
 831
 832         d = dsp_get_info(i_dev);
 833         if (!DSP_REGISTERED(d, i_dev))
 834                 return (EBADF);
 835
 836         PCM_GIANT_ENTER(d);
 837
 838         switch (buf->uio_rw) {
 839         case UIO_READ:
 840                 prio = SD_F_PRIO_RD;
 841                 ch = &rdch;
 842                 chn_io = chn_read;
 843                 break;
 844         case UIO_WRITE:
 845                 prio = SD_F_PRIO_WR;
 846                 ch = &wrch;
 847                 chn_io = chn_write;
 848                 break;
 849         default:
 850                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 851                 break;
 852         }
 853
 854         rdch = NULL;
 855         wrch = NULL;
 856         runpid = buf->uio_td->td_proc->p_pid;
 857
 858         getchns(i_dev, &rdch, &wrch, prio);
 859
 860         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 861                 PCM_GIANT_EXIT(d);
 862                 return (EBADF);
 863         }
 864
 865         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 866             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 867                 relchns(i_dev, rdch, wrch, prio);
 868                 PCM_GIANT_EXIT(d);
 869                 return (EINVAL);
 870         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 871                 (*ch)->flags |= CHN_F_RUNNING;
 872                 (*ch)->pid = runpid;
 873         }
 874
 875         /*
 876          * chn_read/write must give up channel lock in order to copy bytes
 877          * from/to userland, so up the "in progress" counter to make sure
 878          * someone else doesn't come along and muss up the buffer.
 879          */
 880         ++(*ch)->inprog;
 881         ret = chn_io(*ch, buf);
 882         --(*ch)->inprog;
 883
 884         CHN_BROADCAST(&(*ch)->cv);
 885
 886         relchns(i_dev, rdch, wrch, prio);
 887
 888         PCM_GIANT_LEAVE(d);
 889
 890         return (ret);
 891 }
 892
 893 static int
 894 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
 895 {
 896         return (dsp_io_ops(i_dev, buf));
 897 }
 898
 899 static int
 900 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
 901 {
 902         return (dsp_io_ops(i_dev, buf));
 903 }
 904
 905 static int
 906 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 907 {
 908         struct snddev_info *d;
 909         struct pcm_channel *c;
 910         int unit;
 911
 912         KASSERT(dev != NULL && volch != NULL,
 913             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 914
 915         d = dsp_get_info(dev);
 916         if (!PCM_REGISTERED(d)) {
 917                 *volch = NULL;
 918                 return (EINVAL);
 919         }
 920
 921         PCM_UNLOCKASSERT(d);
 922
 923         *volch = NULL;
 924
 925         c = PCM_VOLCH(dev);
 926         if (c != NULL) {
 927                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 928                         return (-1);
 929                 *volch = c;
 930                 return (0);
 931         }
 932
 933         PCM_LOCK(d);
 934         PCM_WAIT(d);
 935         PCM_ACQUIRE(d);
 936
 937         unit = dev2unit(dev);
 938
 939         CHN_FOREACH(c, d, channels.pcm) {
 940                 CHN_LOCK(c);
 941                 if (c->unit != unit) {
 942                         CHN_UNLOCK(c);
 943                         continue;
 944                 }
 945                 *volch = c;
 946                 pcm_chnref(c, 1);
 947                 PCM_VOLCH(dev) = c;
 948                 CHN_UNLOCK(c);
 949                 PCM_RELEASE(d);
 950                 PCM_UNLOCK(d);
 951                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 952         }
 953
 954         PCM_RELEASE(d);
 955         PCM_UNLOCK(d);
 956
 957         return (EINVAL);
 958 }
 959
 960 static int
 961 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 962     caddr_t arg)
 963 {
 964         struct snddev_info *d;
 965         struct pcm_channel *rdch, *wrch;
 966         int j, devtype, ret;
 967
 968         d = dsp_get_info(dev);
 969         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 970                 return (-1);
 971
 972         PCM_UNLOCKASSERT(d);
 973
 974         j = cmd & 0xff;
 975
 976         rdch = PCM_RDCH(dev);
 977         wrch = PCM_WRCH(dev);
 978
 979         /* No specific channel, look into cache */
 980         if (volch == NULL)
 981                 volch = PCM_VOLCH(dev);
 982
 983         /* Look harder */
 984         if (volch == NULL) {
 985                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 986                         volch = rdch;
 987                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 988                         volch = wrch;
 989         }
 990
 991         devtype = PCMDEV(dev);
 992
 993         /* Look super harder */
 994         if (volch == NULL &&
 995             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 996             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 997                 ret = dsp_get_volume_channel(dev, &volch);
 998                 if (ret != 0)
 999                         return (ret);
1000                 if (volch == NULL)
1001                         return (EINVAL);
1002         }
1003
1004         /* Final validation */
1005         if (volch != NULL) {
1006                 CHN_LOCK(volch);
1007                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
1008                         CHN_UNLOCK(volch);
1009                         return (-1);
1010                 }
1011                 if (volch->direction == PCMDIR_PLAY)
1012                         wrch = volch;
1013                 else
1014                         rdch = volch;
1015         }
1016
1017         ret = EINVAL;
1018
1019         if (volch != NULL &&
1020             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1021             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1022                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1023                         int left, right, center;
1024
1025                         left = *(int *)arg & 0x7f;
1026                         right = ((*(int *)arg) >> 8) & 0x7f;
1027                         center = (left + right) >> 1;
1028                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1029                             center);
1030                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1031                         *(int *)arg = CHN_GETVOLUME(volch,
1032                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1033                         *(int *)arg |= CHN_GETVOLUME(volch,
1034                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1035                 }
1036                 ret = 0;
1037         } else if (rdch != NULL || wrch != NULL) {
1038                 switch (j) {
1039                 case SOUND_MIXER_DEVMASK:
1040                 case SOUND_MIXER_CAPS:
1041                 case SOUND_MIXER_STEREODEVS:
1042                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1043                                 *(int *)arg = 0;
1044                                 if (rdch != NULL)
1045                                         *(int *)arg |= SOUND_MASK_RECLEV;
1046                                 if (wrch != NULL)
1047                                         *(int *)arg |= SOUND_MASK_PCM;
1048                         }
1049                         ret = 0;
1050                         break;
1051                 case SOUND_MIXER_RECMASK:
1052                 case SOUND_MIXER_RECSRC:
1053                         if ((cmd & ~0xff) == MIXER_READ(0))
1054                                 *(int *)arg = 0;
1055                         ret = 0;
1056                         break;
1057                 default:
1058                         break;
1059                 }
1060         }
1061
1062         if (volch != NULL)
1063                 CHN_UNLOCK(volch);
1064
1065         return (ret);
1066 }
1067
1068 static int
1069 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1070     struct thread *td)
1071 {
1072         struct pcm_channel *chn, *rdch, *wrch;
1073         struct snddev_info *d;
1074         u_long xcmd;
1075         int *arg_i, ret, tmp;
1076
1077         d = dsp_get_info(i_dev);
1078         if (!DSP_REGISTERED(d, i_dev))
1079                 return (EBADF);
1080
1081         PCM_GIANT_ENTER(d);
1082
1083         arg_i = (int *)arg;
1084         ret = 0;
1085         xcmd = 0;
1086         chn = NULL;
1087
1088         if (IOCGROUP(cmd) == 'M') {
1089                 if (cmd == OSS_GETVERSION) {
1090                         *arg_i = SOUND_VERSION;
1091                         PCM_GIANT_EXIT(d);
1092                         return (0);
1093                 }
1094                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1095                 if (ret != -1) {
1096                         PCM_GIANT_EXIT(d);
1097                         return (ret);
1098                 }
1099
1100                 if (d->mixer_dev != NULL) {
1101                         PCM_ACQUIRE_QUICK(d);
1102                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1103                             MIXER_CMD_DIRECT);
1104                         PCM_RELEASE_QUICK(d);
1105                 } else
1106                         ret = EBADF;
1107
1108                 PCM_GIANT_EXIT(d);
1109
1110                 return (ret);
1111         }
1112
1113         /*
1114          * Certain ioctls may be made on any type of device (audio, mixer,
1115          * and MIDI).  Handle those special cases here.
1116          */
1117         if (IOCGROUP(cmd) == 'X') {
1118                 PCM_ACQUIRE_QUICK(d);
1119                 switch(cmd) {
1120                 case SNDCTL_SYSINFO:
1121                         sound_oss_sysinfo((oss_sysinfo *)arg);
1122                         break;
1123                 case SNDCTL_CARDINFO:
1124                         ret = sound_oss_card_info((oss_card_info *)arg);
1125                         break;
1126                 case SNDCTL_AUDIOINFO:
1127                 case SNDCTL_AUDIOINFO_EX:
1128                 case SNDCTL_ENGINEINFO:
1129                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1130                         break;
1131                 case SNDCTL_MIXERINFO:
1132                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1133                         break;
1134                 default:
1135                         ret = EINVAL;
1136                 }
1137                 PCM_RELEASE_QUICK(d);
1138                 PCM_GIANT_EXIT(d);
1139                 return (ret);
1140         }
1141
1142         getchns(i_dev, &rdch, &wrch, 0);
1143
1144         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1145                 wrch = NULL;
1146         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1147                 rdch = NULL;
1148
1149         if (wrch == NULL && rdch == NULL) {
1150                 PCM_GIANT_EXIT(d);
1151                 return (EINVAL);
1152         }
1153
1154         switch(cmd) {
1155 #ifdef OLDPCM_IOCTL
1156         /*
1157          * we start with the new ioctl interface.
1158          */
1159         case AIONWRITE: /* how many bytes can write ? */
1160                 if (wrch) {
1161                         CHN_LOCK(wrch);
1162 /*
1163                 if (wrch && wrch->bufhard.dl)
1164                         while (chn_wrfeed(wrch) == 0);
1165 */
1166                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1167                         CHN_UNLOCK(wrch);
1168                 } else {
1169                         *arg_i = 0;
1170                         ret = EINVAL;
1171                 }
1172                 break;
1173
1174         case AIOSSIZE:     /* set the current blocksize */
1175                 {
1176                         struct snd_size *p = (struct snd_size *)arg;
1177
1178                         p->play_size = 0;
1179                         p->rec_size = 0;
1180                         PCM_ACQUIRE_QUICK(d);
1181                         if (wrch) {
1182                                 CHN_LOCK(wrch);
1183                                 chn_setblocksize(wrch, 2, p->play_size);
1184                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1185                                 CHN_UNLOCK(wrch);
1186                         }
1187                         if (rdch) {
1188                                 CHN_LOCK(rdch);
1189                                 chn_setblocksize(rdch, 2, p->rec_size);
1190                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1191                                 CHN_UNLOCK(rdch);
1192                         }
1193                         PCM_RELEASE_QUICK(d);
1194                 }
1195                 break;
1196         case AIOGSIZE:  /* get the current blocksize */
1197                 {
1198                         struct snd_size *p = (struct snd_size *)arg;
1199
1200                         if (wrch) {
1201                                 CHN_LOCK(wrch);
1202                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1203                                 CHN_UNLOCK(wrch);
1204                         }
1205                         if (rdch) {
1206                                 CHN_LOCK(rdch);
1207                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1208                                 CHN_UNLOCK(rdch);
1209                         }
1210                 }
1211                 break;
1212
1213         case AIOSFMT:
1214         case AIOGFMT:
1215                 {
1216                         snd_chan_param *p = (snd_chan_param *)arg;
1217
1218                         if (cmd == AIOSFMT &&
1219                             ((p->play_format != 0 && p->play_rate == 0) ||
1220                             (p->rec_format != 0 && p->rec_rate == 0))) {
1221                                 ret = EINVAL;
1222                                 break;
1223                         }
1224                         PCM_ACQUIRE_QUICK(d);
1225                         if (wrch) {
1226                                 CHN_LOCK(wrch);
1227                                 if (cmd == AIOSFMT && p->play_format != 0) {
1228                                         chn_setformat(wrch,
1229                                             SND_FORMAT(p->play_format,
1230                                             AFMT_CHANNEL(wrch->format),
1231                                             AFMT_EXTCHANNEL(wrch->format)));
1232                                         chn_setspeed(wrch, p->play_rate);
1233                                 }
1234                                 p->play_rate = wrch->speed;
1235                                 p->play_format = AFMT_ENCODING(wrch->format);
1236                                 CHN_UNLOCK(wrch);
1237                         } else {
1238                                 p->play_rate = 0;
1239                                 p->play_format = 0;
1240                         }
1241                         if (rdch) {
1242                                 CHN_LOCK(rdch);
1243                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1244                                         chn_setformat(rdch,
1245                                             SND_FORMAT(p->rec_format,
1246                                             AFMT_CHANNEL(rdch->format),
1247                                             AFMT_EXTCHANNEL(rdch->format)));
1248                                         chn_setspeed(rdch, p->rec_rate);
1249                                 }
1250                                 p->rec_rate = rdch->speed;
1251                                 p->rec_format = AFMT_ENCODING(rdch->format);
1252                                 CHN_UNLOCK(rdch);
1253                         } else {
1254                                 p->rec_rate = 0;
1255                                 p->rec_format = 0;
1256                         }
1257                         PCM_RELEASE_QUICK(d);
1258                 }
1259                 break;
1260
1261         case AIOGCAP:     /* get capabilities */
1262                 {
1263                         snd_capabilities *p = (snd_capabilities *)arg;
1264                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1265                         struct cdev *pdev;
1266
1267                         PCM_LOCK(d);
1268                         if (rdch) {
1269                                 CHN_LOCK(rdch);
1270                                 rcaps = chn_getcaps(rdch);
1271                         }
1272                         if (wrch) {
1273                                 CHN_LOCK(wrch);
1274                                 pcaps = chn_getcaps(wrch);
1275                         }
1276                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1277                                           pcaps? pcaps->minspeed : 0);
1278                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1279                                           pcaps? pcaps->maxspeed : 1000000);
1280                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1281                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1282                         /* XXX bad on sb16 */
1283                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1284                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1285                         if (rdch && wrch)
1286                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1287                         pdev = d->mixer_dev;
1288                         p->mixers = 1; /* default: one mixer */
1289                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1290                         p->left = p->right = 100;
1291                         if (wrch)
1292                                 CHN_UNLOCK(wrch);
1293                         if (rdch)
1294                                 CHN_UNLOCK(rdch);
1295                         PCM_UNLOCK(d);
1296                 }
1297                 break;
1298
1299         case AIOSTOP:
1300                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1301                         CHN_LOCK(wrch);
1302                         *arg_i = chn_abort(wrch);
1303                         CHN_UNLOCK(wrch);
1304                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1305                         CHN_LOCK(rdch);
1306                         *arg_i = chn_abort(rdch);
1307                         CHN_UNLOCK(rdch);
1308                 } else {
1309                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1310                         *arg_i = 0;
1311                 }
1312                 break;
1313
1314         case AIOSYNC:
1315                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1316                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1317                 break;
1318 #endif
1319         /*
1320          * here follow the standard ioctls (filio.h etc.)
1321          */
1322         case FIONREAD: /* get # bytes to read */
1323                 if (rdch) {
1324                         CHN_LOCK(rdch);
1325 /*                      if (rdch && rdch->bufhard.dl)
1326                                 while (chn_rdfeed(rdch) == 0);
1327 */
1328                         *arg_i = sndbuf_getready(rdch->bufsoft);
1329                         CHN_UNLOCK(rdch);
1330                 } else {
1331                         *arg_i = 0;
1332                         ret = EINVAL;
1333                 }
1334                 break;
1335
1336         case FIOASYNC: /*set/clear async i/o */
1337                 DEB( printf("FIOASYNC\n") ; )
1338                 break;
1339
1340         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1341         case FIONBIO: /* set/clear non-blocking i/o */
1342                 if (rdch) {
1343                         CHN_LOCK(rdch);
1344                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1345                                 rdch->flags |= CHN_F_NBIO;
1346                         else
1347                                 rdch->flags &= ~CHN_F_NBIO;
1348                         CHN_UNLOCK(rdch);
1349                 }
1350                 if (wrch) {
1351                         CHN_LOCK(wrch);
1352                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1353                                 wrch->flags |= CHN_F_NBIO;
1354                         else
1355                                 wrch->flags &= ~CHN_F_NBIO;
1356                         CHN_UNLOCK(wrch);
1357                 }
1358                 break;
1359
1360         /*
1361          * Finally, here is the linux-compatible ioctl interface
1362          */
1363 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1364         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1365         case SNDCTL_DSP_GETBLKSIZE:
1366                 chn = wrch ? wrch : rdch;
1367                 if (chn) {
1368                         CHN_LOCK(chn);
1369                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1370                         CHN_UNLOCK(chn);
1371                 } else {
1372                         *arg_i = 0;
1373                         ret = EINVAL;
1374                 }
1375                 break;
1376
1377         case SNDCTL_DSP_SETBLKSIZE:
1378                 RANGE(*arg_i, 16, 65536);
1379                 PCM_ACQUIRE_QUICK(d);
1380                 if (wrch) {
1381                         CHN_LOCK(wrch);
1382                         chn_setblocksize(wrch, 2, *arg_i);
1383                         CHN_UNLOCK(wrch);
1384                 }
1385                 if (rdch) {
1386                         CHN_LOCK(rdch);
1387                         chn_setblocksize(rdch, 2, *arg_i);
1388                         CHN_UNLOCK(rdch);
1389                 }
1390                 PCM_RELEASE_QUICK(d);
1391                 break;
1392
1393         case SNDCTL_DSP_RESET:
1394                 DEB(printf("dsp reset\n"));
1395                 if (wrch) {
1396                         CHN_LOCK(wrch);
1397                         chn_abort(wrch);
1398                         chn_resetbuf(wrch);
1399                         CHN_UNLOCK(wrch);
1400                 }
1401                 if (rdch) {
1402                         CHN_LOCK(rdch);
1403                         chn_abort(rdch);
1404                         chn_resetbuf(rdch);
1405                         CHN_UNLOCK(rdch);
1406                 }
1407                 break;
1408
1409         case SNDCTL_DSP_SYNC:
1410                 DEB(printf("dsp sync\n"));
1411                 /* chn_sync may sleep */
1412                 if (wrch) {
1413                         CHN_LOCK(wrch);
1414                         chn_sync(wrch, 0);
1415                         CHN_UNLOCK(wrch);
1416                 }
1417                 break;
1418
1419         case SNDCTL_DSP_SPEED:
1420                 /* chn_setspeed may sleep */
1421                 tmp = 0;
1422                 PCM_ACQUIRE_QUICK(d);
1423                 if (wrch) {
1424                         CHN_LOCK(wrch);
1425                         ret = chn_setspeed(wrch, *arg_i);
1426                         tmp = wrch->speed;
1427                         CHN_UNLOCK(wrch);
1428                 }
1429                 if (rdch && ret == 0) {
1430                         CHN_LOCK(rdch);
1431                         ret = chn_setspeed(rdch, *arg_i);
1432                         if (tmp == 0)
1433                                 tmp = rdch->speed;
1434                         CHN_UNLOCK(rdch);
1435                 }
1436                 PCM_RELEASE_QUICK(d);
1437                 *arg_i = tmp;
1438                 break;
1439
1440         case SOUND_PCM_READ_RATE:
1441                 chn = wrch ? wrch : rdch;
1442                 if (chn) {
1443                         CHN_LOCK(chn);
1444                         *arg_i = chn->speed;
1445                         CHN_UNLOCK(chn);
1446                 } else {
1447                         *arg_i = 0;
1448                         ret = EINVAL;
1449                 }
1450                 break;
1451
1452         case SNDCTL_DSP_STEREO:
1453                 tmp = -1;
1454                 *arg_i = (*arg_i)? 2 : 1;
1455                 PCM_ACQUIRE_QUICK(d);
1456                 if (wrch) {
1457                         CHN_LOCK(wrch);
1458                         ret = chn_setformat(wrch,
1459                             SND_FORMAT(wrch->format, *arg_i, 0));
1460                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1461                         CHN_UNLOCK(wrch);
1462                 }
1463                 if (rdch && ret == 0) {
1464                         CHN_LOCK(rdch);
1465                         ret = chn_setformat(rdch,
1466                             SND_FORMAT(rdch->format, *arg_i, 0));
1467                         if (tmp == -1)
1468                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1469                         CHN_UNLOCK(rdch);
1470                 }
1471                 PCM_RELEASE_QUICK(d);
1472                 *arg_i = tmp;
1473                 break;
1474
1475         case SOUND_PCM_WRITE_CHANNELS:
1476 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1477                 if (*arg_i < 0) {
1478                         *arg_i = 0;
1479                         ret = EINVAL;
1480                         break;
1481                 }
1482                 if (*arg_i != 0) {
1483                         struct pcmchan_matrix *m;
1484                         uint32_t ext;
1485
1486                         tmp = 0;
1487                         if (*arg_i > SND_CHN_MAX)
1488                                 *arg_i = SND_CHN_MAX;
1489
1490                         m = feeder_matrix_default_channel_map(*arg_i);
1491                         if (m != NULL)
1492                                 ext = m->ext;
1493                         else
1494                                 ext = 0;
1495
1496                         PCM_ACQUIRE_QUICK(d);
1497                         if (wrch) {
1498                                 CHN_LOCK(wrch);
1499                                 ret = chn_setformat(wrch,
1500                                     SND_FORMAT(wrch->format, *arg_i, ext));
1501                                 tmp = AFMT_CHANNEL(wrch->format);
1502                                 CHN_UNLOCK(wrch);
1503                         }
1504                         if (rdch && ret == 0) {
1505                                 CHN_LOCK(rdch);
1506                                 ret = chn_setformat(rdch,
1507                                     SND_FORMAT(rdch->format, *arg_i, ext));
1508                                 if (tmp == 0)
1509                                         tmp = AFMT_CHANNEL(rdch->format);
1510                                 CHN_UNLOCK(rdch);
1511                         }
1512                         PCM_RELEASE_QUICK(d);
1513                         *arg_i = tmp;
1514                 } else {
1515                         chn = wrch ? wrch : rdch;
1516                         CHN_LOCK(chn);
1517                         *arg_i = AFMT_CHANNEL(chn->format);
1518                         CHN_UNLOCK(chn);
1519                 }
1520                 break;
1521
1522         case SOUND_PCM_READ_CHANNELS:
1523                 chn = wrch ? wrch : rdch;
1524                 if (chn) {
1525                         CHN_LOCK(chn);
1526                         *arg_i = AFMT_CHANNEL(chn->format);
1527                         CHN_UNLOCK(chn);
1528                 } else {
1529                         *arg_i = 0;
1530                         ret = EINVAL;
1531                 }
1532                 break;
1533
1534         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1535                 chn = wrch ? wrch : rdch;
1536                 if (chn) {
1537                         CHN_LOCK(chn);
1538                         *arg_i = chn_getformats(chn);
1539                         CHN_UNLOCK(chn);
1540                 } else {
1541                         *arg_i = 0;
1542                         ret = EINVAL;
1543                 }
1544                 break;
1545
1546         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1547                 if (*arg_i != AFMT_QUERY) {
1548                         tmp = 0;
1549                         PCM_ACQUIRE_QUICK(d);
1550                         if (wrch) {
1551                                 CHN_LOCK(wrch);
1552                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1553                                     AFMT_CHANNEL(wrch->format),
1554                                     AFMT_EXTCHANNEL(wrch->format)));
1555                                 tmp = wrch->format;
1556                                 CHN_UNLOCK(wrch);
1557                         }
1558                         if (rdch && ret == 0) {
1559                                 CHN_LOCK(rdch);
1560                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1561                                     AFMT_CHANNEL(rdch->format),
1562                                     AFMT_EXTCHANNEL(rdch->format)));
1563                                 if (tmp == 0)
1564                                         tmp = rdch->format;
1565                                 CHN_UNLOCK(rdch);
1566                         }
1567                         PCM_RELEASE_QUICK(d);
1568                         *arg_i = AFMT_ENCODING(tmp);
1569                 } else {
1570                         chn = wrch ? wrch : rdch;
1571                         CHN_LOCK(chn);
1572                         *arg_i = AFMT_ENCODING(chn->format);
1573                         CHN_UNLOCK(chn);
1574                 }
1575                 break;
1576
1577         case SNDCTL_DSP_SETFRAGMENT:
1578                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1579                 {
1580                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1581                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1582                         uint32_t fragsz;
1583                         uint32_t r_maxfrags, r_fragsz;
1584
1585                         RANGE(fragln, 4, 16);
1586                         fragsz = 1 << fragln;
1587
1588                         if (maxfrags == 0)
1589                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1590                         if (maxfrags < 2)
1591                                 maxfrags = 2;
1592                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1593                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1594
1595                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1596                         PCM_ACQUIRE_QUICK(d);
1597                         if (rdch) {
1598                                 CHN_LOCK(rdch);
1599                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1600                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1601                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1602                                 CHN_UNLOCK(rdch);
1603                         } else {
1604                                 r_maxfrags = maxfrags;
1605                                 r_fragsz = fragsz;
1606                         }
1607                         if (wrch && ret == 0) {
1608                                 CHN_LOCK(wrch);
1609                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1610                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1611                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1612                                 CHN_UNLOCK(wrch);
1613                         } else { /* use whatever came from the read channel */
1614                                 maxfrags = r_maxfrags;
1615                                 fragsz = r_fragsz;
1616                         }
1617                         PCM_RELEASE_QUICK(d);
1618
1619                         fragln = 0;
1620                         while (fragsz > 1) {
1621                                 fragln++;
1622                                 fragsz >>= 1;
1623                         }
1624                         *arg_i = (maxfrags << 16) | fragln;
1625                 }
1626                 break;
1627
1628         case SNDCTL_DSP_GETISPACE:
1629                 /* return the size of data available in the input queue */
1630                 {
1631                         audio_buf_info *a = (audio_buf_info *)arg;
1632                         if (rdch) {
1633                                 struct snd_dbuf *bs = rdch->bufsoft;
1634
1635                                 CHN_LOCK(rdch);
1636                                 a->bytes = sndbuf_getready(bs);
1637                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1638                                 a->fragstotal = sndbuf_getblkcnt(bs);
1639                                 a->fragsize = sndbuf_getblksz(bs);
1640                                 CHN_UNLOCK(rdch);
1641                         } else
1642                                 ret = EINVAL;
1643                 }
1644                 break;
1645
1646         case SNDCTL_DSP_GETOSPACE:
1647                 /* return space available in the output queue */
1648                 {
1649                         audio_buf_info *a = (audio_buf_info *)arg;
1650                         if (wrch) {
1651                                 struct snd_dbuf *bs = wrch->bufsoft;
1652
1653                                 CHN_LOCK(wrch);
1654                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1655                                 a->bytes = sndbuf_getfree(bs);
1656                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1657                                 a->fragstotal = sndbuf_getblkcnt(bs);
1658                                 a->fragsize = sndbuf_getblksz(bs);
1659                                 CHN_UNLOCK(wrch);
1660                         } else
1661                                 ret = EINVAL;
1662                 }
1663                 break;
1664
1665         case SNDCTL_DSP_GETIPTR:
1666                 {
1667                         count_info *a = (count_info *)arg;
1668                         if (rdch) {
1669                                 struct snd_dbuf *bs = rdch->bufsoft;
1670
1671                                 CHN_LOCK(rdch);
1672                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1673                                 a->bytes = sndbuf_gettotal(bs);
1674                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1675                                 a->ptr = sndbuf_getfreeptr(bs);
1676                                 rdch->blocks = sndbuf_getblocks(bs);
1677                                 CHN_UNLOCK(rdch);
1678                         } else
1679                                 ret = EINVAL;
1680                 }
1681                 break;
1682
1683         case SNDCTL_DSP_GETOPTR:
1684                 {
1685                         count_info *a = (count_info *)arg;
1686                         if (wrch) {
1687                                 struct snd_dbuf *bs = wrch->bufsoft;
1688
1689                                 CHN_LOCK(wrch);
1690                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1691                                 a->bytes = sndbuf_gettotal(bs);
1692                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1693                                 a->ptr = sndbuf_getreadyptr(bs);
1694                                 wrch->blocks = sndbuf_getblocks(bs);
1695                                 CHN_UNLOCK(wrch);
1696                         } else
1697                                 ret = EINVAL;
1698                 }
1699                 break;
1700
1701         case SNDCTL_DSP_GETCAPS:
1702                 PCM_LOCK(d);
1703                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1704                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1705                         *arg_i |= PCM_CAP_DUPLEX;
1706                 PCM_UNLOCK(d);
1707                 break;
1708
1709         case SOUND_PCM_READ_BITS:
1710                 chn = wrch ? wrch : rdch;
1711                 if (chn) {
1712                         CHN_LOCK(chn);
1713                         if (chn->format & AFMT_8BIT)
1714                                 *arg_i = 8;
1715                         else if (chn->format & AFMT_16BIT)
1716                                 *arg_i = 16;
1717                         else if (chn->format & AFMT_24BIT)
1718                                 *arg_i = 24;
1719                         else if (chn->format & AFMT_32BIT)
1720                                 *arg_i = 32;
1721                         else
1722                                 ret = EINVAL;
1723                         CHN_UNLOCK(chn);
1724                 } else {
1725                         *arg_i = 0;
1726                         ret = EINVAL;
1727                 }
1728                 break;
1729
1730         case SNDCTL_DSP_SETTRIGGER:
1731                 if (rdch) {
1732                         CHN_LOCK(rdch);
1733                         rdch->flags &= ~CHN_F_NOTRIGGER;
1734                         if (*arg_i & PCM_ENABLE_INPUT)
1735                                 chn_start(rdch, 1);
1736                         else {
1737                                 chn_abort(rdch);
1738                                 chn_resetbuf(rdch);
1739                                 rdch->flags |= CHN_F_NOTRIGGER;
1740                         }
1741                         CHN_UNLOCK(rdch);
1742                 }
1743                 if (wrch) {
1744                         CHN_LOCK(wrch);
1745                         wrch->flags &= ~CHN_F_NOTRIGGER;
1746                         if (*arg_i & PCM_ENABLE_OUTPUT)
1747                                 chn_start(wrch, 1);
1748                         else {
1749                                 chn_abort(wrch);
1750                                 chn_resetbuf(wrch);
1751                                 wrch->flags |= CHN_F_NOTRIGGER;
1752                         }
1753                         CHN_UNLOCK(wrch);
1754                 }
1755                 break;
1756
1757         case SNDCTL_DSP_GETTRIGGER:
1758                 *arg_i = 0;
1759                 if (wrch) {
1760                         CHN_LOCK(wrch);
1761                         if (wrch->flags & CHN_F_TRIGGERED)
1762                                 *arg_i |= PCM_ENABLE_OUTPUT;
1763                         CHN_UNLOCK(wrch);
1764                 }
1765                 if (rdch) {
1766                         CHN_LOCK(rdch);
1767                         if (rdch->flags & CHN_F_TRIGGERED)
1768                                 *arg_i |= PCM_ENABLE_INPUT;
1769                         CHN_UNLOCK(rdch);
1770                 }
1771                 break;
1772
1773         case SNDCTL_DSP_GETODELAY:
1774                 if (wrch) {
1775                         struct snd_dbuf *bs = wrch->bufsoft;
1776
1777                         CHN_LOCK(wrch);
1778                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1779                         *arg_i = sndbuf_getready(bs);
1780                         CHN_UNLOCK(wrch);
1781                 } else
1782                         ret = EINVAL;
1783                 break;
1784
1785         case SNDCTL_DSP_POST:
1786                 if (wrch) {
1787                         CHN_LOCK(wrch);
1788                         wrch->flags &= ~CHN_F_NOTRIGGER;
1789                         chn_start(wrch, 1);
1790                         CHN_UNLOCK(wrch);
1791                 }
1792                 break;
1793
1794         case SNDCTL_DSP_SETDUPLEX:
1795                 /*
1796                  * switch to full-duplex mode if card is in half-duplex
1797                  * mode and is able to work in full-duplex mode
1798                  */
1799                 PCM_LOCK(d);
1800                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1801                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1802                 PCM_UNLOCK(d);
1803                 break;
1804
1805         /*
1806          * The following four ioctls are simple wrappers around mixer_ioctl
1807          * with no further processing.  xcmd is short for "translated
1808          * command".
1809          */
1810         case SNDCTL_DSP_GETRECVOL:
1811                 if (xcmd == 0) {
1812                         xcmd = SOUND_MIXER_READ_RECLEV;
1813                         chn = rdch;
1814                 }
1815                 /* FALLTHROUGH */
1816         case SNDCTL_DSP_SETRECVOL:
1817                 if (xcmd == 0) {
1818                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1819                         chn = rdch;
1820                 }
1821                 /* FALLTHROUGH */
1822         case SNDCTL_DSP_GETPLAYVOL:
1823                 if (xcmd == 0) {
1824                         xcmd = SOUND_MIXER_READ_PCM;
1825                         chn = wrch;
1826                 }
1827                 /* FALLTHROUGH */
1828         case SNDCTL_DSP_SETPLAYVOL:
1829                 if (xcmd == 0) {
1830                         xcmd = SOUND_MIXER_WRITE_PCM;
1831                         chn = wrch;
1832                 }
1833
1834                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1835                 if (ret != -1) {
1836                         PCM_GIANT_EXIT(d);
1837                         return (ret);
1838                 }
1839
1840                 if (d->mixer_dev != NULL) {
1841                         PCM_ACQUIRE_QUICK(d);
1842                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1843                             MIXER_CMD_DIRECT);
1844                         PCM_RELEASE_QUICK(d);
1845                 } else
1846                         ret = ENOTSUP;
1847
1848                 break;
1849
1850         case SNDCTL_DSP_GET_RECSRC_NAMES:
1851         case SNDCTL_DSP_GET_RECSRC:
1852         case SNDCTL_DSP_SET_RECSRC:
1853                 if (d->mixer_dev != NULL) {
1854                         PCM_ACQUIRE_QUICK(d);
1855                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1856                             MIXER_CMD_DIRECT);
1857                         PCM_RELEASE_QUICK(d);
1858                 } else
1859                         ret = ENOTSUP;
1860                 break;
1861
1862         /*
1863          * The following 3 ioctls aren't very useful at the moment.  For
1864          * now, only a single channel is associated with a cdev (/dev/dspN
1865          * instance), so there's only a single output routing to use (i.e.,
1866          * the wrch bound to this cdev).
1867          */
1868         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1869                 {
1870                         oss_mixer_enuminfo *ei;
1871                         ei = (oss_mixer_enuminfo *)arg;
1872                         ei->dev = 0;
1873                         ei->ctrl = 0;
1874                         ei->version = 0; /* static for now */
1875                         ei->strindex[0] = 0;
1876
1877                         if (wrch != NULL) {
1878                                 ei->nvalues = 1;
1879                                 strlcpy(ei->strings, wrch->name,
1880                                         sizeof(ei->strings));
1881                         } else {
1882                                 ei->nvalues = 0;
1883                                 ei->strings[0] = '\0';
1884                         }
1885                 }
1886                 break;
1887         case SNDCTL_DSP_GET_PLAYTGT:
1888         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1889                 /*
1890                  * Re: SET_PLAYTGT
1891                  *   OSSv4: "The value that was accepted by the device will
1892                  *   be returned back in the variable pointed by the
1893                  *   argument."
1894                  */
1895                 if (wrch != NULL)
1896                         *arg_i = 0;
1897                 else
1898                         ret = EINVAL;
1899                 break;
1900
1901         case SNDCTL_DSP_SILENCE:
1902         /*
1903          * Flush the software (pre-feed) buffer, but try to minimize playback
1904          * interruption.  (I.e., record unplayed samples with intent to
1905          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1906          * functionality.
1907          */
1908                 if (wrch == NULL)
1909                         ret = EINVAL;
1910                 else {
1911                         struct snd_dbuf *bs;
1912                         CHN_LOCK(wrch);
1913                         while (wrch->inprog != 0)
1914                                 cv_wait(&wrch->cv, wrch->lock);
1915                         bs = wrch->bufsoft;
1916                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1917                                 bs->sl = sndbuf_getready(bs);
1918                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1919                                 sndbuf_fillsilence(bs);
1920                                 chn_start(wrch, 0);
1921                         }
1922                         CHN_UNLOCK(wrch);
1923                 }
1924                 break;
1925
1926         case SNDCTL_DSP_SKIP:
1927         /*
1928          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1929          * playback buffer by moving the current write position immediately
1930          * before the point where the device is currently reading the samples."
1931          */
1932                 if (wrch == NULL)
1933                         ret = EINVAL;
1934                 else {
1935                         struct snd_dbuf *bs;
1936                         CHN_LOCK(wrch);
1937                         while (wrch->inprog != 0)
1938                                 cv_wait(&wrch->cv, wrch->lock);
1939                         bs = wrch->bufsoft;
1940                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1941                                 sndbuf_softreset(bs);
1942                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1943                                 bs->sl = 0;
1944                                 chn_start(wrch, 0);
1945                         }
1946                         CHN_UNLOCK(wrch);
1947                 }
1948                 break;
1949
1950         case SNDCTL_DSP_CURRENT_OPTR:
1951         case SNDCTL_DSP_CURRENT_IPTR:
1952         /**
1953          * @note Changing formats resets the buffer counters, which differs
1954          *       from the 4Front drivers.  However, I don't expect this to be
1955          *       much of a problem.
1956          *
1957          * @note In a test where @c CURRENT_OPTR is called immediately after write
1958          *       returns, this driver is about 32K samples behind whereas
1959          *       4Front's is about 8K samples behind.  Should determine source
1960          *       of discrepancy, even if only out of curiosity.
1961          *
1962          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1963          */
1964                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1965                 if (chn == NULL)
1966                         ret = EINVAL;
1967                 else {
1968                         struct snd_dbuf *bs;
1969                         /* int tmp; */
1970
1971                         oss_count_t *oc = (oss_count_t *)arg;
1972
1973                         CHN_LOCK(chn);
1974                         bs = chn->bufsoft;
1975 #if 0
1976                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1977                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1978                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1979 #else
1980                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1981                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1982 #endif
1983                         CHN_UNLOCK(chn);
1984                 }
1985                 break;
1986
1987         case SNDCTL_DSP_HALT_OUTPUT:
1988         case SNDCTL_DSP_HALT_INPUT:
1989                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1990                 if (chn == NULL)
1991                         ret = EINVAL;
1992                 else {
1993                         CHN_LOCK(chn);
1994                         chn_abort(chn);
1995                         CHN_UNLOCK(chn);
1996                 }
1997                 break;
1998
1999         case SNDCTL_DSP_LOW_WATER:
2000         /*
2001          * Set the number of bytes required to attract attention by
2002          * select/poll.
2003          */
2004                 if (wrch != NULL) {
2005                         CHN_LOCK(wrch);
2006                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
2007                         CHN_UNLOCK(wrch);
2008                 }
2009                 if (rdch != NULL) {
2010                         CHN_LOCK(rdch);
2011                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2012                         CHN_UNLOCK(rdch);
2013                 }
2014                 break;
2015
2016         case SNDCTL_DSP_GETERROR:
2017         /*
2018          * OSSv4 docs:  "All errors and counters will automatically be
2019          * cleared to zeroes after the call so each call will return only
2020          * the errors that occurred after the previous invocation. ... The
2021          * play_underruns and rec_overrun fields are the only useful fields
2022          * returned by OSS 4.0."
2023          */
2024                 {
2025                         audio_errinfo *ei = (audio_errinfo *)arg;
2026
2027                         bzero((void *)ei, sizeof(*ei));
2028
2029                         if (wrch != NULL) {
2030                                 CHN_LOCK(wrch);
2031                                 ei->play_underruns = wrch->xruns;
2032                                 wrch->xruns = 0;
2033                                 CHN_UNLOCK(wrch);
2034                         }
2035                         if (rdch != NULL) {
2036                                 CHN_LOCK(rdch);
2037                                 ei->rec_overruns = rdch->xruns;
2038                                 rdch->xruns = 0;
2039                                 CHN_UNLOCK(rdch);
2040                         }
2041                 }
2042                 break;
2043
2044         case SNDCTL_DSP_SYNCGROUP:
2045                 PCM_ACQUIRE_QUICK(d);
2046                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2047                 PCM_RELEASE_QUICK(d);
2048                 break;
2049
2050         case SNDCTL_DSP_SYNCSTART:
2051                 PCM_ACQUIRE_QUICK(d);
2052                 ret = dsp_oss_syncstart(*arg_i);
2053                 PCM_RELEASE_QUICK(d);
2054                 break;
2055
2056         case SNDCTL_DSP_POLICY:
2057                 PCM_ACQUIRE_QUICK(d);
2058                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2059                 PCM_RELEASE_QUICK(d);
2060                 break;
2061
2062         case SNDCTL_DSP_COOKEDMODE:
2063                 PCM_ACQUIRE_QUICK(d);
2064                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2065                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2066                 PCM_RELEASE_QUICK(d);
2067                 break;
2068         case SNDCTL_DSP_GET_CHNORDER:
2069                 PCM_ACQUIRE_QUICK(d);
2070                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2071                 PCM_RELEASE_QUICK(d);
2072                 break;
2073         case SNDCTL_DSP_SET_CHNORDER:
2074                 PCM_ACQUIRE_QUICK(d);
2075                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2076                 PCM_RELEASE_QUICK(d);
2077                 break;
2078         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2079                 PCM_ACQUIRE_QUICK(d);
2080                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2081                 PCM_RELEASE_QUICK(d);
2082                 break;
2083         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2084                 ret = EINVAL;
2085                 break;
2086 #ifdef  OSSV4_EXPERIMENT
2087         /*
2088          * XXX The following ioctls are not yet supported and just return
2089          * EINVAL.
2090          */
2091         case SNDCTL_DSP_GETOPEAKS:
2092         case SNDCTL_DSP_GETIPEAKS:
2093                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2094                 if (chn == NULL)
2095                         ret = EINVAL;
2096                 else {
2097                         oss_peaks_t *op = (oss_peaks_t *)arg;
2098                         int lpeak, rpeak;
2099
2100                         CHN_LOCK(chn);
2101                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2102                         if (ret == -1)
2103                                 ret = EINVAL;
2104                         else {
2105                                 (*op)[0] = lpeak;
2106                                 (*op)[1] = rpeak;
2107                         }
2108                         CHN_UNLOCK(chn);
2109                 }
2110                 break;
2111
2112         /*
2113          * XXX Once implemented, revisit this for proper cv protection
2114          *     (if necessary).
2115          */
2116         case SNDCTL_GETLABEL:
2117                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2118                 break;
2119         case SNDCTL_SETLABEL:
2120                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2121                 break;
2122         case SNDCTL_GETSONG:
2123                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2124                 break;
2125         case SNDCTL_SETSONG:
2126                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2127                 break;
2128         case SNDCTL_SETNAME:
2129                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2130                 break;
2131 #if 0
2132         /**
2133          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2134          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2135          * 4Front Technologies.
2136          */
2137         case SNDCTL_DSP_READCTL:
2138         case SNDCTL_DSP_WRITECTL:
2139                 ret = EINVAL;
2140                 break;
2141 #endif  /* !0 (explicitly omitted ioctls) */
2142
2143 #endif  /* !OSSV4_EXPERIMENT */
2144         case SNDCTL_DSP_MAPINBUF:
2145         case SNDCTL_DSP_MAPOUTBUF:
2146         case SNDCTL_DSP_SETSYNCRO:
2147                 /* undocumented */
2148
2149         case SNDCTL_DSP_SUBDIVIDE:
2150         case SOUND_PCM_WRITE_FILTER:
2151         case SOUND_PCM_READ_FILTER:
2152                 /* dunno what these do, don't sound important */
2153
2154         default:
2155                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2156                 ret = EINVAL;
2157                 break;
2158         }
2159
2160         PCM_GIANT_LEAVE(d);
2161
2162         return (ret);
2163 }
2164
2165 static int
2166 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2167 {
2168         struct snddev_info *d;
2169         struct pcm_channel *wrch, *rdch;
2170         int ret, e;
2171
2172         d = dsp_get_info(i_dev);
2173         if (!DSP_REGISTERED(d, i_dev))
2174                 return (EBADF);
2175
2176         PCM_GIANT_ENTER(d);
2177
2178         wrch = NULL;
2179         rdch = NULL;
2180         ret = 0;
2181
2182         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2183
2184         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2185                 e = (events & (POLLOUT | POLLWRNORM));
2186                 if (e)
2187                         ret |= chn_poll(wrch, e, td);
2188         }
2189
2190         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2191                 e = (events & (POLLIN | POLLRDNORM));
2192                 if (e)
2193                         ret |= chn_poll(rdch, e, td);
2194         }
2195
2196         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2197
2198         PCM_GIANT_LEAVE(d);
2199
2200         return (ret);
2201 }
2202
2203 static int
2204 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
2205     int nprot, vm_memattr_t *memattr)
2206 {
2207
2208         /* XXX memattr is not honored */
2209         *paddr = vtophys(offset);
2210         return (0);
2211 }
2212
2213 static int
2214 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
2215     vm_size_t size, struct vm_object **object, int nprot)
2216 {
2217         struct snddev_info *d;
2218         struct pcm_channel *wrch, *rdch, *c;
2219
2220         /*
2221          * Reject PROT_EXEC by default. It just doesn't makes sense.
2222          * Unfortunately, we have to give up this one due to linux_mmap
2223          * changes.
2224          *
2225          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2226          *
2227          */
2228 #ifdef SV_ABI_LINUX
2229         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2230             (dsp_mmap_allow_prot_exec == 0 &&
2231             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2232 #else
2233         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2234 #endif
2235                 return (EINVAL);
2236
2237         /*
2238          * PROT_READ (alone) selects the input buffer.
2239          * PROT_WRITE (alone) selects the output buffer.
2240          * PROT_WRITE|PROT_READ together select the output buffer.
2241          */
2242         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2243                 return (EINVAL);
2244
2245         d = dsp_get_info(i_dev);
2246         if (!DSP_REGISTERED(d, i_dev))
2247                 return (EINVAL);
2248
2249         PCM_GIANT_ENTER(d);
2250
2251         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2252
2253         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2254         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2255             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2256             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2257             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2258                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2259                 PCM_GIANT_EXIT(d);
2260                 return (EINVAL);
2261         }
2262
2263         if (wrch != NULL)
2264                 wrch->flags |= CHN_F_MMAP;
2265         if (rdch != NULL)
2266                 rdch->flags |= CHN_F_MMAP;
2267
2268         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2269         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2270         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
2271             size, nprot, *offset, curthread->td_ucred);
2272
2273         PCM_GIANT_LEAVE(d);
2274
2275         if (*object == NULL)
2276                  return (EINVAL);
2277         return (0);
2278 }
2279
2280 /* So much for dev_stdclone() */
2281 static int
2282 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2283 {
2284         size_t len;
2285
2286         len = strlen(namep);
2287
2288         if (bcmp(name, namep, len) != 0)
2289                 return (ENODEV);
2290
2291         name += len;
2292
2293         if (isdigit(*name) == 0)
2294                 return (ENODEV);
2295
2296         len = strlen(sep);
2297
2298         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2299                 return (ENODEV);
2300
2301         for (*u = 0; isdigit(*name) != 0; name++) {
2302                 *u *= 10;
2303                 *u += *name - '0';
2304                 if (*u > dsp_umax)
2305                         return (ENODEV);
2306         }
2307
2308         if (*name == '\0')
2309                 return ((use_sep == 0) ? 0 : ENODEV);
2310
2311         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2312                 return (ENODEV);
2313
2314         name += len;
2315
2316         if (*name == '0' && name[1] != '\0')
2317                 return (ENODEV);
2318
2319         for (*c = 0; isdigit(*name) != 0; name++) {
2320                 *c *= 10;
2321                 *c += *name - '0';
2322                 if (*c > dsp_cmax)
2323                         return (ENODEV);
2324         }
2325
2326         if (*name != '\0')
2327                 return (ENODEV);
2328
2329         return (0);
2330 }
2331
2332 static void
2333 dsp_clone(void *arg,
2334     struct ucred *cred,
2335     char *name, int namelen, struct cdev **dev)
2336 {
2337         struct snddev_info *d;
2338         struct snd_clone_entry *ce;
2339         struct pcm_channel *c;
2340         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2341         char *devname, *devcmp, *devsep;
2342
2343         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2344
2345         if (*dev != NULL)
2346                 return;
2347
2348         unit = -1;
2349         cunit = -1;
2350         devtype = -1;
2351         devhw = 0;
2352         devcmax = -1;
2353         tumax = -1;
2354         devname = NULL;
2355         devsep = NULL;
2356
2357         for (i = 0; unit == -1 &&
2358             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2359                 devtype = dsp_cdevs[i].type;
2360                 devcmp = dsp_cdevs[i].name;
2361                 devsep = dsp_cdevs[i].sep;
2362                 devname = dsp_cdevs[i].alias;
2363                 if (devname == NULL)
2364                         devname = devcmp;
2365                 devhw = dsp_cdevs[i].hw;
2366                 devcmax = dsp_cdevs[i].max - 1;
2367                 if (strcmp(name, devcmp) == 0) {
2368                         if (dsp_basename_clone != 0)
2369                                 unit = snd_unit;
2370                 } else if (dsp_stdclone(name, devcmp, devsep,
2371                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2372                         unit = -1;
2373                         cunit = -1;
2374                 }
2375         }
2376
2377         d = devclass_get_softc(pcm_devclass, unit);
2378         if (!PCM_REGISTERED(d) || d->clones == NULL)
2379                 return;
2380
2381         /* XXX Need Giant magic entry ??? */
2382
2383         PCM_LOCK(d);
2384         if (snd_clone_disabled(d->clones)) {
2385                 PCM_UNLOCK(d);
2386                 return;
2387         }
2388
2389         PCM_WAIT(d);
2390         PCM_ACQUIRE(d);
2391         PCM_UNLOCK(d);
2392
2393         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2394
2395         if (devhw != 0) {
2396                 KASSERT(devcmax <= dsp_cmax,
2397                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2398                 if (cunit > devcmax) {
2399                         PCM_RELEASE_QUICK(d);
2400                         return;
2401                 }
2402                 udcmask |= snd_c2unit(cunit);
2403                 CHN_FOREACH(c, d, channels.pcm) {
2404                         CHN_LOCK(c);
2405                         if (c->unit != udcmask) {
2406                                 CHN_UNLOCK(c);
2407                                 continue;
2408                         }
2409                         CHN_UNLOCK(c);
2410                         udcmask &= ~snd_c2unit(cunit);
2411                         /*
2412                          * Temporarily increase clone maxunit to overcome
2413                          * vchan flexibility.
2414                          *
2415                          * # sysctl dev.pcm.0.play.vchans=256
2416                          * dev.pcm.0.play.vchans: 1 -> 256
2417                          * # cat /dev/zero > /dev/dsp0.vp255 &
2418                          * [1] 17296
2419                          * # sysctl dev.pcm.0.play.vchans=0
2420                          * dev.pcm.0.play.vchans: 256 -> 1
2421                          * # fg
2422                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2423                          * ^C
2424                          * # cat /dev/zero > /dev/dsp0.vp255
2425                          * zsh: operation not supported: /dev/dsp0.vp255
2426                          */
2427                         tumax = snd_clone_getmaxunit(d->clones);
2428                         if (cunit > tumax)
2429                                 snd_clone_setmaxunit(d->clones, cunit);
2430                         else
2431                                 tumax = -1;
2432                         goto dsp_clone_alloc;
2433                 }
2434                 /*
2435                  * Ok, so we're requesting unallocated vchan, but still
2436                  * within maximum vchan limit.
2437                  */
2438                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2439                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2440                     cunit < snd_maxautovchans) {
2441                         udcmask &= ~snd_c2unit(cunit);
2442                         tumax = snd_clone_getmaxunit(d->clones);
2443                         if (cunit > tumax)
2444                                 snd_clone_setmaxunit(d->clones, cunit);
2445                         else
2446                                 tumax = -1;
2447                         goto dsp_clone_alloc;
2448                 }
2449                 PCM_RELEASE_QUICK(d);
2450                 return;
2451         }
2452
2453 dsp_clone_alloc:
2454         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2455         if (tumax != -1)
2456                 snd_clone_setmaxunit(d->clones, tumax);
2457         if (ce != NULL) {
2458                 udcmask |= snd_c2unit(cunit);
2459                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2460                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2461                     devname, unit, devsep, cunit);
2462                 snd_clone_register(ce, *dev);
2463         }
2464
2465         PCM_RELEASE_QUICK(d);
2466
2467         if (*dev != NULL)
2468                 dev_ref(*dev);
2469 }
2470
2471 static void
2472 dsp_sysinit(void *p)
2473 {
2474         if (dsp_ehtag != NULL)
2475                 return;
2476         /* initialize unit numbering */
2477         snd_unit_init();
2478         dsp_umax = PCMMAXUNIT;
2479         dsp_cmax = PCMMAXCHAN;
2480         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2481 }
2482
2483 static void
2484 dsp_sysuninit(void *p)
2485 {
2486         if (dsp_ehtag == NULL)
2487                 return;
2488         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2489         dsp_ehtag = NULL;
2490 }
2491
2492 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2493 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2494
2495 char *
2496 dsp_unit2name(char *buf, size_t len, int unit)
2497 {
2498         int i, dtype;
2499
2500         KASSERT(buf != NULL && len != 0,
2501             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2502
2503         dtype = snd_unit2d(unit);
2504
2505         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2506                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2507                         continue;
2508                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2509                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2510                 return (buf);
2511         }
2512
2513         return (NULL);
2514 }
2515
2516 /**
2517  * @brief Handler for SNDCTL_AUDIOINFO.
2518  *
2519  * Gathers information about the audio device specified in ai->dev.  If
2520  * ai->dev == -1, then this function gathers information about the current
2521  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2522  * return EINVAL.
2523  *
2524  * This routine is supposed to go practically straight to the hardware,
2525  * getting capabilities directly from the sound card driver, side-stepping
2526  * the intermediate channel interface.
2527  *
2528  * Note, however, that the usefulness of this command is significantly
2529  * decreased when requesting info about any device other than the one serving
2530  * the request. While each snddev_channel refers to a specific device node,
2531  * the converse is *not* true.  Currently, when a sound device node is opened,
2532  * the sound subsystem scans for an available audio channel (or channels, if
2533  * opened in read+write) and then assigns them to the si_drv[12] private
2534  * data fields.  As a result, any information returned linking a channel to
2535  * a specific character device isn't necessarily accurate.
2536  *
2537  * @note
2538  * Calling threads must not hold any snddev_info or pcm_channel locks.
2539  *
2540  * @param dev           device on which the ioctl was issued
2541  * @param ai            ioctl request data container
2542  *
2543  * @retval 0            success
2544  * @retval EINVAL       ai->dev specifies an invalid device
2545  *
2546  * @todo Verify correctness of Doxygen tags.  ;)
2547  */
2548 int
2549 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2550 {
2551         struct pcmchan_caps *caps;
2552         struct pcm_channel *ch;
2553         struct snddev_info *d;
2554         uint32_t fmts;
2555         int i, nchan, *rates, minch, maxch;
2556         char *devname, buf[CHN_NAMELEN];
2557
2558         /*
2559          * If probing the device that received the ioctl, make sure it's a
2560          * DSP device.  (Users may use this ioctl with /dev/mixer and
2561          * /dev/midi.)
2562          */
2563         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2564                 return (EINVAL);
2565
2566         ch = NULL;
2567         devname = NULL;
2568         nchan = 0;
2569         bzero(buf, sizeof(buf));
2570
2571         /*
2572          * Search for the requested audio device (channel).  Start by
2573          * iterating over pcm devices.
2574          */
2575         for (i = 0; pcm_devclass != NULL &&
2576             i < devclass_get_maxunit(pcm_devclass); i++) {
2577                 d = devclass_get_softc(pcm_devclass, i);
2578                 if (!PCM_REGISTERED(d))
2579                         continue;
2580
2581                 /* XXX Need Giant magic entry ??? */
2582
2583                 /* See the note in function docblock */
2584                 PCM_UNLOCKASSERT(d);
2585                 PCM_LOCK(d);
2586
2587                 CHN_FOREACH(ch, d, channels.pcm) {
2588                         CHN_UNLOCKASSERT(ch);
2589                         CHN_LOCK(ch);
2590                         if (ai->dev == -1) {
2591                                 if (DSP_REGISTERED(d, i_dev) &&
2592                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2593                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2594                                         devname = dsp_unit2name(buf,
2595                                             sizeof(buf), ch->unit);
2596                                 }
2597                         } else if (ai->dev == nchan) {
2598                                 devname = dsp_unit2name(buf, sizeof(buf),
2599                                     ch->unit);
2600                         }
2601                         if (devname != NULL)
2602                                 break;
2603                         CHN_UNLOCK(ch);
2604                         ++nchan;
2605                 }
2606
2607                 if (devname != NULL) {
2608                         /*
2609                          * At this point, the following synchronization stuff
2610                          * has happened:
2611                          * - a specific PCM device is locked.
2612                          * - a specific audio channel has been locked, so be
2613                          *   sure to unlock when exiting;
2614                          */
2615
2616                         caps = chn_getcaps(ch);
2617
2618                         /*
2619                          * With all handles collected, zero out the user's
2620                          * container and begin filling in its fields.
2621                          */
2622                         bzero((void *)ai, sizeof(oss_audioinfo));
2623
2624                         ai->dev = nchan;
2625                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2626
2627                         if ((ch->flags & CHN_F_BUSY) == 0)
2628                                 ai->busy = 0;
2629                         else
2630                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2631
2632                         /**
2633                          * @note
2634                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2635                          *    this moment." Cop-out, I know, but I'll save
2636                          *    running around in the process table for later.
2637                          *    Is there a risk of leaking information?
2638                          */
2639                         ai->pid = ch->pid;
2640
2641                         /*
2642                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2643                          * Note, however, that a single channel operates in
2644                          * only one direction, so PCM_CAP_DUPLEX is out.
2645                          */
2646                         /**
2647                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2648                          *       these in pcmchan::caps?
2649                          */
2650                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2651                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2652
2653                         /*
2654                          * Collect formats supported @b natively by the
2655                          * device.  Also determine min/max channels.  (I.e.,
2656                          * mono, stereo, or both?)
2657                          *
2658                          * If any channel is stereo, maxch = 2;
2659                          * if all channels are stereo, minch = 2, too;
2660                          * if any channel is mono, minch = 1;
2661                          * and if all channels are mono, maxch = 1.
2662                          */
2663                         minch = 0;
2664                         maxch = 0;
2665                         fmts = 0;
2666                         for (i = 0; caps->fmtlist[i]; i++) {
2667                                 fmts |= caps->fmtlist[i];
2668                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2669                                         minch = (minch == 0) ? 2 : minch;
2670                                         maxch = 2;
2671                                 } else {
2672                                         minch = 1;
2673                                         maxch = (maxch == 0) ? 1 : maxch;
2674                                 }
2675                         }
2676
2677                         if (ch->direction == PCMDIR_PLAY)
2678                                 ai->oformats = fmts;
2679                         else
2680                                 ai->iformats = fmts;
2681
2682                         /**
2683                          * @note
2684                          * @c magic - OSSv4 docs: "Reserved for internal use
2685                          *    by OSS."
2686                          *
2687                          * @par
2688                          * @c card_number - OSSv4 docs: "Number of the sound
2689                          *    card where this device belongs or -1 if this
2690                          *    information is not available.  Applications
2691                          *    should normally not use this field for any
2692                          *    purpose."
2693                          */
2694                         ai->card_number = -1;
2695                         /**
2696                          * @todo @c song_name - depends first on
2697                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2698                          *          on SNDCTL_[GS]ETLABEL
2699                          * @todo @c port_number - routing information?
2700                          */
2701                         ai->port_number = -1;
2702                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2703                         /**
2704                          * @note
2705                          * @c real_device - OSSv4 docs:  "Obsolete."
2706                          */
2707                         ai->real_device = -1;
2708                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2709                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2710                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2711                         /**
2712                          * @note
2713                          * @c flags - OSSv4 docs: "Reserved for future use."
2714                          *
2715                          * @note
2716                          * @c binding - OSSv4 docs: "Reserved for future use."
2717                          *
2718                          * @todo @c handle - haven't decided how to generate
2719                          *       this yet; bus, vendor, device IDs?
2720                          */
2721                         ai->min_rate = caps->minspeed;
2722                         ai->max_rate = caps->maxspeed;
2723
2724                         ai->min_channels = minch;
2725                         ai->max_channels = maxch;
2726
2727                         ai->nrates = chn_getrates(ch, &rates);
2728                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2729                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2730
2731                         for (i = 0; i < ai->nrates; i++)
2732                                 ai->rates[i] = rates[i];
2733
2734                         ai->next_play_engine = 0;
2735                         ai->next_rec_engine = 0;
2736
2737                         CHN_UNLOCK(ch);
2738                 }
2739
2740                 PCM_UNLOCK(d);
2741
2742                 if (devname != NULL)
2743                         return (0);
2744         }
2745
2746         /* Exhausted the search -- nothing is locked, so return. */
2747         return (EINVAL);
2748 }
2749
2750 /**
2751  * @brief Assigns a PCM channel to a sync group.
2752  *
2753  * Sync groups are used to enable audio operations on multiple devices
2754  * simultaneously.  They may be used with any number of devices and may
2755  * span across applications.  Devices are added to groups with
2756  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2757  * SNDCTL_DSP_SYNCSTART ioctl.
2758  *
2759  * If the @c id field of the @c group parameter is set to zero, then a new
2760  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2761  * the group specified.
2762  *
2763  * @todo As far as memory allocation, should we assume that things are
2764  *       okay and allocate with M_WAITOK before acquiring channel locks,
2765  *       freeing later if not?
2766  *
2767  * @param wrch  output channel associated w/ device (if any)
2768  * @param rdch  input channel associated w/ device (if any)
2769  * @param group Sync group parameters
2770  *
2771  * @retval 0            success
2772  * @retval non-zero     error to be propagated upstream
2773  */
2774 static int
2775 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2776 {
2777         struct pcmchan_syncmember *smrd, *smwr;
2778         struct pcmchan_syncgroup *sg;
2779         int ret, sg_ids[3];
2780
2781         smrd = NULL;
2782         smwr = NULL;
2783         sg = NULL;
2784         ret = 0;
2785
2786         /*
2787          * Free_unr() may sleep, so store released syncgroup IDs until after
2788          * all locks are released.
2789          */
2790         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2791
2792         PCM_SG_LOCK();
2793
2794         /*
2795          * - Insert channel(s) into group's member list.
2796          * - Set CHN_F_NOTRIGGER on channel(s).
2797          * - Stop channel(s).
2798          */
2799
2800         /*
2801          * If device's channels are already mapped to a group, unmap them.
2802          */
2803         if (wrch) {
2804                 CHN_LOCK(wrch);
2805                 sg_ids[0] = chn_syncdestroy(wrch);
2806         }
2807
2808         if (rdch) {
2809                 CHN_LOCK(rdch);
2810                 sg_ids[1] = chn_syncdestroy(rdch);
2811         }
2812
2813         /*
2814          * Verify that mode matches character device properites.
2815          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2816          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2817          */
2818         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2819             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2820                 ret = EINVAL;
2821                 goto out;
2822         }
2823
2824         /*
2825          * An id of zero indicates the user wants to create a new
2826          * syncgroup.
2827          */
2828         if (group->id == 0) {
2829                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2830                 if (sg != NULL) {
2831                         SLIST_INIT(&sg->members);
2832                         sg->id = alloc_unr(pcmsg_unrhdr);
2833
2834                         group->id = sg->id;
2835                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2836                 } else
2837                         ret = ENOMEM;
2838         } else {
2839                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2840                         if (sg->id == group->id)
2841                                 break;
2842                 }
2843                 if (sg == NULL)
2844                         ret = EINVAL;
2845         }
2846
2847         /* Couldn't create or find a syncgroup.  Fail. */
2848         if (sg == NULL)
2849                 goto out;
2850
2851         /*
2852          * Allocate a syncmember, assign it and a channel together, and
2853          * insert into syncgroup.
2854          */
2855         if (group->mode & PCM_ENABLE_INPUT) {
2856                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2857                 if (smrd == NULL) {
2858                         ret = ENOMEM;
2859                         goto out;
2860                 }
2861
2862                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2863                 smrd->parent = sg;
2864                 smrd->ch = rdch;
2865
2866                 chn_abort(rdch);
2867                 rdch->flags |= CHN_F_NOTRIGGER;
2868                 rdch->sm = smrd;
2869         }
2870
2871         if (group->mode & PCM_ENABLE_OUTPUT) {
2872                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2873                 if (smwr == NULL) {
2874                         ret = ENOMEM;
2875                         goto out;
2876                 }
2877
2878                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2879                 smwr->parent = sg;
2880                 smwr->ch = wrch;
2881
2882                 chn_abort(wrch);
2883                 wrch->flags |= CHN_F_NOTRIGGER;
2884                 wrch->sm = smwr;
2885         }
2886
2887
2888 out:
2889         if (ret != 0) {
2890                 if (smrd != NULL)
2891                         free(smrd, M_DEVBUF);
2892                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2893                         sg_ids[2] = sg->id;
2894                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2895                         free(sg, M_DEVBUF);
2896                 }
2897
2898                 if (wrch)
2899                         wrch->sm = NULL;
2900                 if (rdch)
2901                         rdch->sm = NULL;
2902         }
2903
2904         if (wrch)
2905                 CHN_UNLOCK(wrch);
2906         if (rdch)
2907                 CHN_UNLOCK(rdch);
2908
2909         PCM_SG_UNLOCK();
2910
2911         if (sg_ids[0])
2912                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2913         if (sg_ids[1])
2914                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2915         if (sg_ids[2])
2916                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2917
2918         return (ret);
2919 }
2920
2921 /**
2922  * @brief Launch a sync group into action
2923  *
2924  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2925  * iterates over all members, triggering them along the way.
2926  *
2927  * @note Caller must not hold any channel locks.
2928  *
2929  * @param sg_id sync group identifier
2930  *
2931  * @retval 0    success
2932  * @retval non-zero     error worthy of propagating upstream to user
2933  */
2934 static int
2935 dsp_oss_syncstart(int sg_id)
2936 {
2937         struct pcmchan_syncmember *sm, *sm_tmp;
2938         struct pcmchan_syncgroup *sg;
2939         struct pcm_channel *c;
2940         int ret, needlocks;
2941
2942         /* Get the synclists lock */
2943         PCM_SG_LOCK();
2944
2945         do {
2946                 ret = 0;
2947                 needlocks = 0;
2948
2949                 /* Search for syncgroup by ID */
2950                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2951                         if (sg->id == sg_id)
2952                                 break;
2953                 }
2954
2955                 /* Return EINVAL if not found */
2956                 if (sg == NULL) {
2957                         ret = EINVAL;
2958                         break;
2959                 }
2960
2961                 /* Any removals resulting in an empty group should've handled this */
2962                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2963
2964                 /*
2965                  * Attempt to lock all member channels - if any are already
2966                  * locked, unlock those acquired, sleep for a bit, and try
2967                  * again.
2968                  */
2969                 SLIST_FOREACH(sm, &sg->members, link) {
2970                         if (CHN_TRYLOCK(sm->ch) == 0) {
2971                                 int timo = hz * 5/1000;
2972                                 if (timo < 1)
2973                                         timo = 1;
2974
2975                                 /* Release all locked channels so far, retry */
2976                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2977                                         /* sm is the member already locked */
2978                                         if (sm == sm_tmp)
2979                                                 break;
2980                                         CHN_UNLOCK(sm_tmp->ch);
2981                                 }
2982
2983                                 /** @todo Is PRIBIO correct/ */
2984                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2985                                     PRIBIO | PCATCH, "pcmsg", timo);
2986                                 if (ret == EINTR || ret == ERESTART)
2987                                         break;
2988
2989                                 needlocks = 1;
2990                                 ret = 0; /* Assumes ret == EAGAIN... */
2991                         }
2992                 }
2993         } while (needlocks && ret == 0);
2994
2995         /* Proceed only if no errors encountered. */
2996         if (ret == 0) {
2997                 /* Launch channels */
2998                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
2999                         SLIST_REMOVE_HEAD(&sg->members, link);
3000
3001                         c = sm->ch;
3002                         c->sm = NULL;
3003                         chn_start(c, 1);
3004                         c->flags &= ~CHN_F_NOTRIGGER;
3005                         CHN_UNLOCK(c);
3006
3007                         free(sm, M_DEVBUF);
3008                 }
3009
3010                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3011                 free(sg, M_DEVBUF);
3012         }
3013
3014         PCM_SG_UNLOCK();
3015
3016         /*
3017          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3018          * first.
3019          */
3020         if (ret == 0)
3021                 free_unr(pcmsg_unrhdr, sg_id);
3022
3023         return (ret);
3024 }
3025
3026 /**
3027  * @brief Handler for SNDCTL_DSP_POLICY
3028  *
3029  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3030  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3031  * specifying those two parameters, s/he simply selects a number from 0..10
3032  * which corresponds to a buffer size.  Smaller numbers request smaller
3033  * buffers with lower latencies (at greater overhead from more frequent
3034  * interrupts), while greater numbers behave in the opposite manner.
3035  *
3036  * The 4Front spec states that a value of 5 should be the default.  However,
3037  * this implementation deviates slightly by using a linear scale without
3038  * consulting drivers.  I.e., even though drivers may have different default
3039  * buffer sizes, a policy argument of 5 will have the same result across
3040  * all drivers.
3041  *
3042  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3043  * more information.
3044  *
3045  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3046  *       work with hardware drivers directly.
3047  *
3048  * @note PCM channel arguments must not be locked by caller.
3049  *
3050  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3051  * @param rdch  " recording channel (optional; may be NULL)
3052  * @param policy Integer from [0:10]
3053  *
3054  * @retval 0    constant (for now)
3055  */
3056 static int
3057 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3058 {
3059         int ret;
3060
3061         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3062                 return (EIO);
3063
3064         /* Default: success */
3065         ret = 0;
3066
3067         if (rdch) {
3068                 CHN_LOCK(rdch);
3069                 ret = chn_setlatency(rdch, policy);
3070                 CHN_UNLOCK(rdch);
3071         }
3072
3073         if (wrch && ret == 0) {
3074                 CHN_LOCK(wrch);
3075                 ret = chn_setlatency(wrch, policy);
3076                 CHN_UNLOCK(wrch);
3077         }
3078
3079         if (ret)
3080                 ret = EIO;
3081
3082         return (ret);
3083 }
3084
3085 /**
3086  * @brief Enable or disable "cooked" mode
3087  *
3088  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3089  * is the default, the sound system handles rate and format conversions
3090  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3091  * operates with 44100Hz/16bit/signed samples).
3092  *
3093  * Disabling cooked mode is intended for applications wanting to mmap()
3094  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3095  * feeder architecture, presumably to gain as much control over audio
3096  * hardware as possible.
3097  *
3098  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3099  * for more details.
3100  *
3101  * @param wrch          playback channel (optional; may be NULL)
3102  * @param rdch          recording channel (optional; may be NULL)
3103  * @param enabled       0 = raw mode, 1 = cooked mode
3104  *
3105  * @retval EINVAL       Operation not yet supported.
3106  */
3107 static int
3108 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3109 {
3110
3111         /*
3112          * XXX I just don't get it. Why don't they call it
3113          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3114          * This is just plain so confusing, incoherent,
3115          * <insert any non-printable characters here>.
3116          */
3117         if (!(enabled == 1 || enabled == 0))
3118                 return (EINVAL);
3119
3120         /*
3121          * I won't give in. I'm inverting its logic here and now.
3122          * Brag all you want, but "BITPERFECT" should be the better
3123          * term here.
3124          */
3125         enabled ^= 0x00000001;
3126
3127         if (wrch != NULL) {
3128                 CHN_LOCK(wrch);
3129                 wrch->flags &= ~CHN_F_BITPERFECT;
3130                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3131                 CHN_UNLOCK(wrch);
3132         }
3133
3134         if (rdch != NULL) {
3135                 CHN_LOCK(rdch);
3136                 rdch->flags &= ~CHN_F_BITPERFECT;
3137                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3138                 CHN_UNLOCK(rdch);
3139         }
3140
3141         return (0);
3142 }
3143
3144 /**
3145  * @brief Retrieve channel interleaving order
3146  *
3147  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3148  *
3149  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3150  * for more details.
3151  *
3152  * @note As the ioctl definition is still under construction, FreeBSD
3153  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3154  *
3155  * @param wrch  playback channel (optional; may be NULL)
3156  * @param rdch  recording channel (optional; may be NULL)
3157  * @param map   channel map (result will be stored there)
3158  *
3159  * @retval EINVAL       Operation not yet supported.
3160  */
3161 static int
3162 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3163 {
3164         struct pcm_channel *ch;
3165         int ret;
3166
3167         ch = (wrch != NULL) ? wrch : rdch;
3168         if (ch != NULL) {
3169                 CHN_LOCK(ch);
3170                 ret = chn_oss_getorder(ch, map);
3171                 CHN_UNLOCK(ch);
3172         } else
3173                 ret = EINVAL;
3174
3175         return (ret);
3176 }
3177
3178 /**
3179  * @brief Specify channel interleaving order
3180  *
3181  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3182  *
3183  * @note As the ioctl definition is still under construction, FreeBSD
3184  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3185  *
3186  * @param wrch  playback channel (optional; may be NULL)
3187  * @param rdch  recording channel (optional; may be NULL)
3188  * @param map   channel map
3189  *
3190  * @retval EINVAL       Operation not yet supported.
3191  */
3192 static int
3193 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3194 {
3195         int ret;
3196
3197         ret = 0;
3198
3199         if (wrch != NULL) {
3200                 CHN_LOCK(wrch);
3201                 ret = chn_oss_setorder(wrch, map);
3202                 CHN_UNLOCK(wrch);
3203         }
3204
3205         if (ret == 0 && rdch != NULL) {
3206                 CHN_LOCK(rdch);
3207                 ret = chn_oss_setorder(rdch, map);
3208                 CHN_UNLOCK(rdch);
3209         }
3210
3211         return (ret);
3212 }
3213
3214 static int
3215 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3216     int *mask)
3217 {
3218         struct pcm_channel *ch;
3219         uint32_t chnmask;
3220         int ret;
3221
3222         chnmask = 0;
3223         ch = (wrch != NULL) ? wrch : rdch;
3224
3225         if (ch != NULL) {
3226                 CHN_LOCK(ch);
3227                 ret = chn_oss_getmask(ch, &chnmask);
3228                 CHN_UNLOCK(ch);
3229         } else
3230                 ret = EINVAL;
3231
3232         if (ret == 0)
3233                 *mask = chnmask;
3234
3235         return (ret);
3236 }
3237
3238 #ifdef OSSV4_EXPERIMENT
3239 /**
3240  * @brief Retrieve an audio device's label
3241  *
3242  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3243  *
3244  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3245  * for more details.
3246  *
3247  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3248  * consoles) can show variable "labels" for certain controls. By default
3249  * the application name (say quake) is shown as the label but
3250  * applications may change the labels themselves."
3251  *
3252  * @note As the ioctl definition is still under construction, FreeBSD
3253  *       does not currently support @c SNDCTL_GETLABEL.
3254  *
3255  * @param wrch  playback channel (optional; may be NULL)
3256  * @param rdch  recording channel (optional; may be NULL)
3257  * @param label label gets copied here
3258  *
3259  * @retval EINVAL       Operation not yet supported.
3260  */
3261 static int
3262 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3263 {
3264         return (EINVAL);
3265 }
3266
3267 /**
3268  * @brief Specify an audio device's label
3269  *
3270  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3271  * comments for @c dsp_oss_getlabel immediately above.
3272  *
3273  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3274  * for more details.
3275  *
3276  * @note As the ioctl definition is still under construction, FreeBSD
3277  *       does not currently support SNDCTL_SETLABEL.
3278  *
3279  * @param wrch  playback channel (optional; may be NULL)
3280  * @param rdch  recording channel (optional; may be NULL)
3281  * @param label label gets copied from here
3282  *
3283  * @retval EINVAL       Operation not yet supported.
3284  */
3285 static int
3286 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3287 {
3288         return (EINVAL);
3289 }
3290
3291 /**
3292  * @brief Retrieve name of currently played song
3293  *
3294  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3295  * tell the system the name of the currently playing song, which would be
3296  * visible in @c /dev/sndstat.
3297  *
3298  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3299  * for more details.
3300  *
3301  * @note As the ioctl definition is still under construction, FreeBSD
3302  *       does not currently support SNDCTL_GETSONG.
3303  *
3304  * @param wrch  playback channel (optional; may be NULL)
3305  * @param rdch  recording channel (optional; may be NULL)
3306  * @param song  song name gets copied here
3307  *
3308  * @retval EINVAL       Operation not yet supported.
3309  */
3310 static int
3311 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3312 {
3313         return (EINVAL);
3314 }
3315
3316 /**
3317  * @brief Retrieve name of currently played song
3318  *
3319  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3320  * tell the system the name of the currently playing song, which would be
3321  * visible in @c /dev/sndstat.
3322  *
3323  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3324  * for more details.
3325  *
3326  * @note As the ioctl definition is still under construction, FreeBSD
3327  *       does not currently support SNDCTL_SETSONG.
3328  *
3329  * @param wrch  playback channel (optional; may be NULL)
3330  * @param rdch  recording channel (optional; may be NULL)
3331  * @param song  song name gets copied from here
3332  *
3333  * @retval EINVAL       Operation not yet supported.
3334  */
3335 static int
3336 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3337 {
3338         return (EINVAL);
3339 }
3340
3341 /**
3342  * @brief Rename a device
3343  *
3344  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3345  *
3346  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3347  * more details.
3348  *
3349  * From Hannu@4Front:  "This call is used to change the device name
3350  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3351  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3352  * name depending on the current context (for example 'OSS virtual wave table
3353  * synth' or 'VoIP link to London')."
3354  *
3355  * @note As the ioctl definition is still under construction, FreeBSD
3356  *       does not currently support SNDCTL_SETNAME.
3357  *
3358  * @param wrch  playback channel (optional; may be NULL)
3359  * @param rdch  recording channel (optional; may be NULL)
3360  * @param name  new device name gets copied from here
3361  *
3362  * @retval EINVAL       Operation not yet supported.
3363  */
3364 static int
3365 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3366 {
3367         return (EINVAL);
3368 }
3369 #endif  /* !OSSV4_EXPERIMENT */