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_DETACHING(d) || !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         PCM_LOCK(d);
 653
 654         /*
 655          * We're done. Allocate channels information for this cdev.
 656          */
 657         switch (volctl) {
 658         case DSP_CDEV_VOLCTL_READ:
 659                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 660                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 661                 break;
 662         case DSP_CDEV_VOLCTL_WRITE:
 663                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 664                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 665                 break;
 666         case DSP_CDEV_VOLCTL_NONE:
 667         default:
 668                 if (wrch == NULL && rdch == NULL) {
 669                         (void)snd_clone_release(i_dev);
 670                         PCM_RELEASE(d);
 671                         PCM_UNLOCK(d);
 672                         PCM_GIANT_EXIT(d);
 673                         if (wrerror != 0)
 674                                 return (wrerror);
 675                         if (rderror != 0)
 676                                 return (rderror);
 677                         return (EINVAL);
 678                 }
 679                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 680                 if (rdch != NULL)
 681                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 682                 if (wrch != NULL)
 683                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 684                 break;
 685         }
 686
 687         /*
 688          * Increase clone refcount for its automatic garbage collector.
 689          */
 690         (void)snd_clone_ref(i_dev);
 691
 692         PCM_RELEASE(d);
 693         PCM_UNLOCK(d);
 694
 695         PCM_GIANT_LEAVE(d);
 696
 697         return (0);
 698 }
 699
 700 static int
 701 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 702 {
 703         struct pcm_channel *rdch, *wrch, *volch;
 704         struct snddev_info *d;
 705         int sg_ids, rdref, wdref;
 706
 707         d = dsp_get_info(i_dev);
 708         if (!DSP_REGISTERED(d, i_dev))
 709                 return (EBADF);
 710
 711         PCM_GIANT_ENTER(d);
 712
 713         PCM_LOCK(d);
 714         PCM_WAIT(d);
 715         PCM_ACQUIRE(d);
 716
 717         rdch = PCM_RDCH(i_dev);
 718         wrch = PCM_WRCH(i_dev);
 719         volch = PCM_VOLCH(i_dev);
 720
 721         PCM_RDCH(i_dev) = NULL;
 722         PCM_WRCH(i_dev) = NULL;
 723         PCM_VOLCH(i_dev) = NULL;
 724
 725         rdref = -1;
 726         wdref = -1;
 727
 728         if (volch != NULL) {
 729                 if (volch == rdch)
 730                         rdref--;
 731                 else if (volch == wrch)
 732                         wdref--;
 733                 else {
 734                         CHN_LOCK(volch);
 735                         pcm_chnref(volch, -1);
 736                         CHN_UNLOCK(volch);
 737                 }
 738         }
 739
 740         if (rdch != NULL)
 741                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 742         if (wrch != NULL)
 743                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 744
 745         if (rdch != NULL || wrch != NULL) {
 746                 PCM_UNLOCK(d);
 747                 if (rdch != NULL) {
 748                         /*
 749                          * The channel itself need not be locked because:
 750                          *   a)  Adding a channel to a syncgroup happens only
 751                          *       in dsp_ioctl(), which cannot run concurrently
 752                          *       to dsp_close().
 753                          *   b)  The syncmember pointer (sm) is protected by
 754                          *       the global syncgroup list lock.
 755                          *   c)  A channel can't just disappear, invalidating
 756                          *       pointers, unless it's closed/dereferenced
 757                          *       first.
 758                          */
 759                         PCM_SG_LOCK();
 760                         sg_ids = chn_syncdestroy(rdch);
 761                         PCM_SG_UNLOCK();
 762                         if (sg_ids != 0)
 763                                 free_unr(pcmsg_unrhdr, sg_ids);
 764
 765                         CHN_LOCK(rdch);
 766                         pcm_chnref(rdch, rdref);
 767                         chn_abort(rdch); /* won't sleep */
 768                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 769                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 770                         chn_reset(rdch, 0, 0);
 771                         pcm_chnrelease(rdch);
 772                 }
 773                 if (wrch != NULL) {
 774                         /*
 775                          * Please see block above.
 776                          */
 777                         PCM_SG_LOCK();
 778                         sg_ids = chn_syncdestroy(wrch);
 779                         PCM_SG_UNLOCK();
 780                         if (sg_ids != 0)
 781                                 free_unr(pcmsg_unrhdr, sg_ids);
 782
 783                         CHN_LOCK(wrch);
 784                         pcm_chnref(wrch, wdref);
 785                         chn_flush(wrch); /* may sleep */
 786                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 787                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 788                         chn_reset(wrch, 0, 0);
 789                         pcm_chnrelease(wrch);
 790                 }
 791                 PCM_LOCK(d);
 792         }
 793
 794         dsp_cdevinfo_free(i_dev);
 795         /*
 796          * Release clone busy state and unref it so the automatic
 797          * garbage collector will get the hint and do the remaining
 798          * cleanup process.
 799          */
 800         (void)snd_clone_release(i_dev);
 801
 802         /*
 803          * destroy_dev() might sleep, so release pcm lock
 804          * here and rely on pcm cv serialization.
 805          */
 806         PCM_UNLOCK(d);
 807         (void)snd_clone_unref(i_dev);
 808         PCM_LOCK(d);
 809
 810         PCM_RELEASE(d);
 811         PCM_UNLOCK(d);
 812
 813         PCM_GIANT_LEAVE(d);
 814
 815         return (0);
 816 }
 817
 818 static __inline int
 819 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 820 {
 821         struct snddev_info *d;
 822         struct pcm_channel **ch, *rdch, *wrch;
 823         int (*chn_io)(struct pcm_channel *, struct uio *);
 824         int prio, ret;
 825         pid_t runpid;
 826
 827         KASSERT(i_dev != NULL && buf != NULL &&
 828             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 829             ("%s(): io train wreck!", __func__));
 830
 831         d = dsp_get_info(i_dev);
 832         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 833                 return (EBADF);
 834
 835         PCM_GIANT_ENTER(d);
 836
 837         switch (buf->uio_rw) {
 838         case UIO_READ:
 839                 prio = SD_F_PRIO_RD;
 840                 ch = &rdch;
 841                 chn_io = chn_read;
 842                 break;
 843         case UIO_WRITE:
 844                 prio = SD_F_PRIO_WR;
 845                 ch = &wrch;
 846                 chn_io = chn_write;
 847                 break;
 848         default:
 849                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 850                 break;
 851         }
 852
 853         rdch = NULL;
 854         wrch = NULL;
 855         runpid = buf->uio_td->td_proc->p_pid;
 856
 857         getchns(i_dev, &rdch, &wrch, prio);
 858
 859         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 860                 PCM_GIANT_EXIT(d);
 861                 return (EBADF);
 862         }
 863
 864         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 865             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 866                 relchns(i_dev, rdch, wrch, prio);
 867                 PCM_GIANT_EXIT(d);
 868                 return (EINVAL);
 869         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 870                 (*ch)->flags |= CHN_F_RUNNING;
 871                 (*ch)->pid = runpid;
 872         }
 873
 874         /*
 875          * chn_read/write must give up channel lock in order to copy bytes
 876          * from/to userland, so up the "in progress" counter to make sure
 877          * someone else doesn't come along and muss up the buffer.
 878          */
 879         ++(*ch)->inprog;
 880         ret = chn_io(*ch, buf);
 881         --(*ch)->inprog;
 882
 883         CHN_BROADCAST(&(*ch)->cv);
 884
 885         relchns(i_dev, rdch, wrch, prio);
 886
 887         PCM_GIANT_LEAVE(d);
 888
 889         return (ret);
 890 }
 891
 892 static int
 893 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
 894 {
 895         return (dsp_io_ops(i_dev, buf));
 896 }
 897
 898 static int
 899 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
 900 {
 901         return (dsp_io_ops(i_dev, buf));
 902 }
 903
 904 static int
 905 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 906 {
 907         struct snddev_info *d;
 908         struct pcm_channel *c;
 909         int unit;
 910
 911         KASSERT(dev != NULL && volch != NULL,
 912             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 913
 914         d = dsp_get_info(dev);
 915         if (!PCM_REGISTERED(d)) {
 916                 *volch = NULL;
 917                 return (EINVAL);
 918         }
 919
 920         PCM_UNLOCKASSERT(d);
 921
 922         *volch = NULL;
 923
 924         c = PCM_VOLCH(dev);
 925         if (c != NULL) {
 926                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 927                         return (-1);
 928                 *volch = c;
 929                 return (0);
 930         }
 931
 932         PCM_LOCK(d);
 933         PCM_WAIT(d);
 934         PCM_ACQUIRE(d);
 935
 936         unit = dev2unit(dev);
 937
 938         CHN_FOREACH(c, d, channels.pcm) {
 939                 CHN_LOCK(c);
 940                 if (c->unit != unit) {
 941                         CHN_UNLOCK(c);
 942                         continue;
 943                 }
 944                 *volch = c;
 945                 pcm_chnref(c, 1);
 946                 PCM_VOLCH(dev) = c;
 947                 CHN_UNLOCK(c);
 948                 PCM_RELEASE(d);
 949                 PCM_UNLOCK(d);
 950                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 951         }
 952
 953         PCM_RELEASE(d);
 954         PCM_UNLOCK(d);
 955
 956         return (EINVAL);
 957 }
 958
 959 static int
 960 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 961     caddr_t arg)
 962 {
 963         struct snddev_info *d;
 964         struct pcm_channel *rdch, *wrch;
 965         int j, devtype, ret;
 966
 967         d = dsp_get_info(dev);
 968         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 969                 return (-1);
 970
 971         PCM_UNLOCKASSERT(d);
 972
 973         j = cmd & 0xff;
 974
 975         rdch = PCM_RDCH(dev);
 976         wrch = PCM_WRCH(dev);
 977
 978         /* No specific channel, look into cache */
 979         if (volch == NULL)
 980                 volch = PCM_VOLCH(dev);
 981
 982         /* Look harder */
 983         if (volch == NULL) {
 984                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 985                         volch = rdch;
 986                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 987                         volch = wrch;
 988         }
 989
 990         devtype = PCMDEV(dev);
 991
 992         /* Look super harder */
 993         if (volch == NULL &&
 994             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 995             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 996                 ret = dsp_get_volume_channel(dev, &volch);
 997                 if (ret != 0)
 998                         return (ret);
 999                 if (volch == NULL)
1000                         return (EINVAL);
1001         }
1002
1003         /* Final validation */
1004         if (volch != NULL) {
1005                 CHN_LOCK(volch);
1006                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
1007                         CHN_UNLOCK(volch);
1008                         return (-1);
1009                 }
1010                 if (volch->direction == PCMDIR_PLAY)
1011                         wrch = volch;
1012                 else
1013                         rdch = volch;
1014         }
1015
1016         ret = EINVAL;
1017
1018         if (volch != NULL &&
1019             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1020             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1021                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1022                         int left, right, center;
1023
1024                         left = *(int *)arg & 0x7f;
1025                         right = ((*(int *)arg) >> 8) & 0x7f;
1026                         center = (left + right) >> 1;
1027                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1028                             center);
1029                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1030                         *(int *)arg = CHN_GETVOLUME(volch,
1031                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1032                         *(int *)arg |= CHN_GETVOLUME(volch,
1033                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1034                 }
1035                 ret = 0;
1036         } else if (rdch != NULL || wrch != NULL) {
1037                 switch (j) {
1038                 case SOUND_MIXER_DEVMASK:
1039                 case SOUND_MIXER_CAPS:
1040                 case SOUND_MIXER_STEREODEVS:
1041                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1042                                 *(int *)arg = 0;
1043                                 if (rdch != NULL)
1044                                         *(int *)arg |= SOUND_MASK_RECLEV;
1045                                 if (wrch != NULL)
1046                                         *(int *)arg |= SOUND_MASK_PCM;
1047                         }
1048                         ret = 0;
1049                         break;
1050                 case SOUND_MIXER_RECMASK:
1051                 case SOUND_MIXER_RECSRC:
1052                         if ((cmd & ~0xff) == MIXER_READ(0))
1053                                 *(int *)arg = 0;
1054                         ret = 0;
1055                         break;
1056                 default:
1057                         break;
1058                 }
1059         }
1060
1061         if (volch != NULL)
1062                 CHN_UNLOCK(volch);
1063
1064         return (ret);
1065 }
1066
1067 static int
1068 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1069     struct thread *td)
1070 {
1071         struct pcm_channel *chn, *rdch, *wrch;
1072         struct snddev_info *d;
1073         u_long xcmd;
1074         int *arg_i, ret, tmp;
1075
1076         d = dsp_get_info(i_dev);
1077         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
1078                 return (EBADF);
1079
1080         PCM_GIANT_ENTER(d);
1081
1082         arg_i = (int *)arg;
1083         ret = 0;
1084         xcmd = 0;
1085         chn = NULL;
1086
1087         if (IOCGROUP(cmd) == 'M') {
1088                 if (cmd == OSS_GETVERSION) {
1089                         *arg_i = SOUND_VERSION;
1090                         PCM_GIANT_EXIT(d);
1091                         return (0);
1092                 }
1093                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1094                 if (ret != -1) {
1095                         PCM_GIANT_EXIT(d);
1096                         return (ret);
1097                 }
1098
1099                 if (d->mixer_dev != NULL) {
1100                         PCM_ACQUIRE_QUICK(d);
1101                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1102                             MIXER_CMD_DIRECT);
1103                         PCM_RELEASE_QUICK(d);
1104                 } else
1105                         ret = EBADF;
1106
1107                 PCM_GIANT_EXIT(d);
1108
1109                 return (ret);
1110         }
1111
1112         /*
1113          * Certain ioctls may be made on any type of device (audio, mixer,
1114          * and MIDI).  Handle those special cases here.
1115          */
1116         if (IOCGROUP(cmd) == 'X') {
1117                 PCM_ACQUIRE_QUICK(d);
1118                 switch(cmd) {
1119                 case SNDCTL_SYSINFO:
1120                         sound_oss_sysinfo((oss_sysinfo *)arg);
1121                         break;
1122                 case SNDCTL_CARDINFO:
1123                         ret = sound_oss_card_info((oss_card_info *)arg);
1124                         break;
1125                 case SNDCTL_AUDIOINFO:
1126                 case SNDCTL_AUDIOINFO_EX:
1127                 case SNDCTL_ENGINEINFO:
1128                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1129                         break;
1130                 case SNDCTL_MIXERINFO:
1131                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1132                         break;
1133                 default:
1134                         ret = EINVAL;
1135                 }
1136                 PCM_RELEASE_QUICK(d);
1137                 PCM_GIANT_EXIT(d);
1138                 return (ret);
1139         }
1140
1141         getchns(i_dev, &rdch, &wrch, 0);
1142
1143         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1144                 wrch = NULL;
1145         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1146                 rdch = NULL;
1147
1148         if (wrch == NULL && rdch == NULL) {
1149                 PCM_GIANT_EXIT(d);
1150                 return (EINVAL);
1151         }
1152
1153         switch(cmd) {
1154 #ifdef OLDPCM_IOCTL
1155         /*
1156          * we start with the new ioctl interface.
1157          */
1158         case AIONWRITE: /* how many bytes can write ? */
1159                 if (wrch) {
1160                         CHN_LOCK(wrch);
1161 /*
1162                 if (wrch && wrch->bufhard.dl)
1163                         while (chn_wrfeed(wrch) == 0);
1164 */
1165                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1166                         CHN_UNLOCK(wrch);
1167                 } else {
1168                         *arg_i = 0;
1169                         ret = EINVAL;
1170                 }
1171                 break;
1172
1173         case AIOSSIZE:     /* set the current blocksize */
1174                 {
1175                         struct snd_size *p = (struct snd_size *)arg;
1176
1177                         p->play_size = 0;
1178                         p->rec_size = 0;
1179                         PCM_ACQUIRE_QUICK(d);
1180                         if (wrch) {
1181                                 CHN_LOCK(wrch);
1182                                 chn_setblocksize(wrch, 2, p->play_size);
1183                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1184                                 CHN_UNLOCK(wrch);
1185                         }
1186                         if (rdch) {
1187                                 CHN_LOCK(rdch);
1188                                 chn_setblocksize(rdch, 2, p->rec_size);
1189                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1190                                 CHN_UNLOCK(rdch);
1191                         }
1192                         PCM_RELEASE_QUICK(d);
1193                 }
1194                 break;
1195         case AIOGSIZE:  /* get the current blocksize */
1196                 {
1197                         struct snd_size *p = (struct snd_size *)arg;
1198
1199                         if (wrch) {
1200                                 CHN_LOCK(wrch);
1201                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1202                                 CHN_UNLOCK(wrch);
1203                         }
1204                         if (rdch) {
1205                                 CHN_LOCK(rdch);
1206                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1207                                 CHN_UNLOCK(rdch);
1208                         }
1209                 }
1210                 break;
1211
1212         case AIOSFMT:
1213         case AIOGFMT:
1214                 {
1215                         snd_chan_param *p = (snd_chan_param *)arg;
1216
1217                         if (cmd == AIOSFMT &&
1218                             ((p->play_format != 0 && p->play_rate == 0) ||
1219                             (p->rec_format != 0 && p->rec_rate == 0))) {
1220                                 ret = EINVAL;
1221                                 break;
1222                         }
1223                         PCM_ACQUIRE_QUICK(d);
1224                         if (wrch) {
1225                                 CHN_LOCK(wrch);
1226                                 if (cmd == AIOSFMT && p->play_format != 0) {
1227                                         chn_setformat(wrch,
1228                                             SND_FORMAT(p->play_format,
1229                                             AFMT_CHANNEL(wrch->format),
1230                                             AFMT_EXTCHANNEL(wrch->format)));
1231                                         chn_setspeed(wrch, p->play_rate);
1232                                 }
1233                                 p->play_rate = wrch->speed;
1234                                 p->play_format = AFMT_ENCODING(wrch->format);
1235                                 CHN_UNLOCK(wrch);
1236                         } else {
1237                                 p->play_rate = 0;
1238                                 p->play_format = 0;
1239                         }
1240                         if (rdch) {
1241                                 CHN_LOCK(rdch);
1242                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1243                                         chn_setformat(rdch,
1244                                             SND_FORMAT(p->rec_format,
1245                                             AFMT_CHANNEL(rdch->format),
1246                                             AFMT_EXTCHANNEL(rdch->format)));
1247                                         chn_setspeed(rdch, p->rec_rate);
1248                                 }
1249                                 p->rec_rate = rdch->speed;
1250                                 p->rec_format = AFMT_ENCODING(rdch->format);
1251                                 CHN_UNLOCK(rdch);
1252                         } else {
1253                                 p->rec_rate = 0;
1254                                 p->rec_format = 0;
1255                         }
1256                         PCM_RELEASE_QUICK(d);
1257                 }
1258                 break;
1259
1260         case AIOGCAP:     /* get capabilities */
1261                 {
1262                         snd_capabilities *p = (snd_capabilities *)arg;
1263                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1264                         struct cdev *pdev;
1265
1266                         PCM_LOCK(d);
1267                         if (rdch) {
1268                                 CHN_LOCK(rdch);
1269                                 rcaps = chn_getcaps(rdch);
1270                         }
1271                         if (wrch) {
1272                                 CHN_LOCK(wrch);
1273                                 pcaps = chn_getcaps(wrch);
1274                         }
1275                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1276                                           pcaps? pcaps->minspeed : 0);
1277                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1278                                           pcaps? pcaps->maxspeed : 1000000);
1279                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1280                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1281                         /* XXX bad on sb16 */
1282                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1283                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1284                         if (rdch && wrch)
1285                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1286                         pdev = d->mixer_dev;
1287                         p->mixers = 1; /* default: one mixer */
1288                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1289                         p->left = p->right = 100;
1290                         if (wrch)
1291                                 CHN_UNLOCK(wrch);
1292                         if (rdch)
1293                                 CHN_UNLOCK(rdch);
1294                         PCM_UNLOCK(d);
1295                 }
1296                 break;
1297
1298         case AIOSTOP:
1299                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1300                         CHN_LOCK(wrch);
1301                         *arg_i = chn_abort(wrch);
1302                         CHN_UNLOCK(wrch);
1303                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1304                         CHN_LOCK(rdch);
1305                         *arg_i = chn_abort(rdch);
1306                         CHN_UNLOCK(rdch);
1307                 } else {
1308                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1309                         *arg_i = 0;
1310                 }
1311                 break;
1312
1313         case AIOSYNC:
1314                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1315                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1316                 break;
1317 #endif
1318         /*
1319          * here follow the standard ioctls (filio.h etc.)
1320          */
1321         case FIONREAD: /* get # bytes to read */
1322                 if (rdch) {
1323                         CHN_LOCK(rdch);
1324 /*                      if (rdch && rdch->bufhard.dl)
1325                                 while (chn_rdfeed(rdch) == 0);
1326 */
1327                         *arg_i = sndbuf_getready(rdch->bufsoft);
1328                         CHN_UNLOCK(rdch);
1329                 } else {
1330                         *arg_i = 0;
1331                         ret = EINVAL;
1332                 }
1333                 break;
1334
1335         case FIOASYNC: /*set/clear async i/o */
1336                 DEB( printf("FIOASYNC\n") ; )
1337                 break;
1338
1339         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1340         case FIONBIO: /* set/clear non-blocking i/o */
1341                 if (rdch) {
1342                         CHN_LOCK(rdch);
1343                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1344                                 rdch->flags |= CHN_F_NBIO;
1345                         else
1346                                 rdch->flags &= ~CHN_F_NBIO;
1347                         CHN_UNLOCK(rdch);
1348                 }
1349                 if (wrch) {
1350                         CHN_LOCK(wrch);
1351                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1352                                 wrch->flags |= CHN_F_NBIO;
1353                         else
1354                                 wrch->flags &= ~CHN_F_NBIO;
1355                         CHN_UNLOCK(wrch);
1356                 }
1357                 break;
1358
1359         /*
1360          * Finally, here is the linux-compatible ioctl interface
1361          */
1362 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1363         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1364         case SNDCTL_DSP_GETBLKSIZE:
1365                 chn = wrch ? wrch : rdch;
1366                 if (chn) {
1367                         CHN_LOCK(chn);
1368                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1369                         CHN_UNLOCK(chn);
1370                 } else {
1371                         *arg_i = 0;
1372                         ret = EINVAL;
1373                 }
1374                 break;
1375
1376         case SNDCTL_DSP_SETBLKSIZE:
1377                 RANGE(*arg_i, 16, 65536);
1378                 PCM_ACQUIRE_QUICK(d);
1379                 if (wrch) {
1380                         CHN_LOCK(wrch);
1381                         chn_setblocksize(wrch, 2, *arg_i);
1382                         CHN_UNLOCK(wrch);
1383                 }
1384                 if (rdch) {
1385                         CHN_LOCK(rdch);
1386                         chn_setblocksize(rdch, 2, *arg_i);
1387                         CHN_UNLOCK(rdch);
1388                 }
1389                 PCM_RELEASE_QUICK(d);
1390                 break;
1391
1392         case SNDCTL_DSP_RESET:
1393                 DEB(printf("dsp reset\n"));
1394                 if (wrch) {
1395                         CHN_LOCK(wrch);
1396                         chn_abort(wrch);
1397                         chn_resetbuf(wrch);
1398                         CHN_UNLOCK(wrch);
1399                 }
1400                 if (rdch) {
1401                         CHN_LOCK(rdch);
1402                         chn_abort(rdch);
1403                         chn_resetbuf(rdch);
1404                         CHN_UNLOCK(rdch);
1405                 }
1406                 break;
1407
1408         case SNDCTL_DSP_SYNC:
1409                 DEB(printf("dsp sync\n"));
1410                 /* chn_sync may sleep */
1411                 if (wrch) {
1412                         CHN_LOCK(wrch);
1413                         chn_sync(wrch, 0);
1414                         CHN_UNLOCK(wrch);
1415                 }
1416                 break;
1417
1418         case SNDCTL_DSP_SPEED:
1419                 /* chn_setspeed may sleep */
1420                 tmp = 0;
1421                 PCM_ACQUIRE_QUICK(d);
1422                 if (wrch) {
1423                         CHN_LOCK(wrch);
1424                         ret = chn_setspeed(wrch, *arg_i);
1425                         tmp = wrch->speed;
1426                         CHN_UNLOCK(wrch);
1427                 }
1428                 if (rdch && ret == 0) {
1429                         CHN_LOCK(rdch);
1430                         ret = chn_setspeed(rdch, *arg_i);
1431                         if (tmp == 0)
1432                                 tmp = rdch->speed;
1433                         CHN_UNLOCK(rdch);
1434                 }
1435                 PCM_RELEASE_QUICK(d);
1436                 *arg_i = tmp;
1437                 break;
1438
1439         case SOUND_PCM_READ_RATE:
1440                 chn = wrch ? wrch : rdch;
1441                 if (chn) {
1442                         CHN_LOCK(chn);
1443                         *arg_i = chn->speed;
1444                         CHN_UNLOCK(chn);
1445                 } else {
1446                         *arg_i = 0;
1447                         ret = EINVAL;
1448                 }
1449                 break;
1450
1451         case SNDCTL_DSP_STEREO:
1452                 tmp = -1;
1453                 *arg_i = (*arg_i)? 2 : 1;
1454                 PCM_ACQUIRE_QUICK(d);
1455                 if (wrch) {
1456                         CHN_LOCK(wrch);
1457                         ret = chn_setformat(wrch,
1458                             SND_FORMAT(wrch->format, *arg_i, 0));
1459                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1460                         CHN_UNLOCK(wrch);
1461                 }
1462                 if (rdch && ret == 0) {
1463                         CHN_LOCK(rdch);
1464                         ret = chn_setformat(rdch,
1465                             SND_FORMAT(rdch->format, *arg_i, 0));
1466                         if (tmp == -1)
1467                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1468                         CHN_UNLOCK(rdch);
1469                 }
1470                 PCM_RELEASE_QUICK(d);
1471                 *arg_i = tmp;
1472                 break;
1473
1474         case SOUND_PCM_WRITE_CHANNELS:
1475 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1476                 if (*arg_i < 0) {
1477                         *arg_i = 0;
1478                         ret = EINVAL;
1479                         break;
1480                 }
1481                 if (*arg_i != 0) {
1482                         struct pcmchan_matrix *m;
1483                         uint32_t ext;
1484
1485                         tmp = 0;
1486                         if (*arg_i > SND_CHN_MAX)
1487                                 *arg_i = SND_CHN_MAX;
1488
1489                         m = feeder_matrix_default_channel_map(*arg_i);
1490                         if (m != NULL)
1491                                 ext = m->ext;
1492                         else
1493                                 ext = 0;
1494
1495                         PCM_ACQUIRE_QUICK(d);
1496                         if (wrch) {
1497                                 CHN_LOCK(wrch);
1498                                 ret = chn_setformat(wrch,
1499                                     SND_FORMAT(wrch->format, *arg_i, ext));
1500                                 tmp = AFMT_CHANNEL(wrch->format);
1501                                 CHN_UNLOCK(wrch);
1502                         }
1503                         if (rdch && ret == 0) {
1504                                 CHN_LOCK(rdch);
1505                                 ret = chn_setformat(rdch,
1506                                     SND_FORMAT(rdch->format, *arg_i, ext));
1507                                 if (tmp == 0)
1508                                         tmp = AFMT_CHANNEL(rdch->format);
1509                                 CHN_UNLOCK(rdch);
1510                         }
1511                         PCM_RELEASE_QUICK(d);
1512                         *arg_i = tmp;
1513                 } else {
1514                         chn = wrch ? wrch : rdch;
1515                         CHN_LOCK(chn);
1516                         *arg_i = AFMT_CHANNEL(chn->format);
1517                         CHN_UNLOCK(chn);
1518                 }
1519                 break;
1520
1521         case SOUND_PCM_READ_CHANNELS:
1522                 chn = wrch ? wrch : rdch;
1523                 if (chn) {
1524                         CHN_LOCK(chn);
1525                         *arg_i = AFMT_CHANNEL(chn->format);
1526                         CHN_UNLOCK(chn);
1527                 } else {
1528                         *arg_i = 0;
1529                         ret = EINVAL;
1530                 }
1531                 break;
1532
1533         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1534                 chn = wrch ? wrch : rdch;
1535                 if (chn) {
1536                         CHN_LOCK(chn);
1537                         *arg_i = chn_getformats(chn);
1538                         CHN_UNLOCK(chn);
1539                 } else {
1540                         *arg_i = 0;
1541                         ret = EINVAL;
1542                 }
1543                 break;
1544
1545         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1546                 if (*arg_i != AFMT_QUERY) {
1547                         tmp = 0;
1548                         PCM_ACQUIRE_QUICK(d);
1549                         if (wrch) {
1550                                 CHN_LOCK(wrch);
1551                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1552                                     AFMT_CHANNEL(wrch->format),
1553                                     AFMT_EXTCHANNEL(wrch->format)));
1554                                 tmp = wrch->format;
1555                                 CHN_UNLOCK(wrch);
1556                         }
1557                         if (rdch && ret == 0) {
1558                                 CHN_LOCK(rdch);
1559                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1560                                     AFMT_CHANNEL(rdch->format),
1561                                     AFMT_EXTCHANNEL(rdch->format)));
1562                                 if (tmp == 0)
1563                                         tmp = rdch->format;
1564                                 CHN_UNLOCK(rdch);
1565                         }
1566                         PCM_RELEASE_QUICK(d);
1567                         *arg_i = AFMT_ENCODING(tmp);
1568                 } else {
1569                         chn = wrch ? wrch : rdch;
1570                         CHN_LOCK(chn);
1571                         *arg_i = AFMT_ENCODING(chn->format);
1572                         CHN_UNLOCK(chn);
1573                 }
1574                 break;
1575
1576         case SNDCTL_DSP_SETFRAGMENT:
1577                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1578                 {
1579                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1580                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1581                         uint32_t fragsz;
1582                         uint32_t r_maxfrags, r_fragsz;
1583
1584                         RANGE(fragln, 4, 16);
1585                         fragsz = 1 << fragln;
1586
1587                         if (maxfrags == 0)
1588                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1589                         if (maxfrags < 2)
1590                                 maxfrags = 2;
1591                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1592                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1593
1594                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1595                         PCM_ACQUIRE_QUICK(d);
1596                         if (rdch) {
1597                                 CHN_LOCK(rdch);
1598                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1599                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1600                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1601                                 CHN_UNLOCK(rdch);
1602                         } else {
1603                                 r_maxfrags = maxfrags;
1604                                 r_fragsz = fragsz;
1605                         }
1606                         if (wrch && ret == 0) {
1607                                 CHN_LOCK(wrch);
1608                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1609                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1610                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1611                                 CHN_UNLOCK(wrch);
1612                         } else { /* use whatever came from the read channel */
1613                                 maxfrags = r_maxfrags;
1614                                 fragsz = r_fragsz;
1615                         }
1616                         PCM_RELEASE_QUICK(d);
1617
1618                         fragln = 0;
1619                         while (fragsz > 1) {
1620                                 fragln++;
1621                                 fragsz >>= 1;
1622                         }
1623                         *arg_i = (maxfrags << 16) | fragln;
1624                 }
1625                 break;
1626
1627         case SNDCTL_DSP_GETISPACE:
1628                 /* return the size of data available in the input queue */
1629                 {
1630                         audio_buf_info *a = (audio_buf_info *)arg;
1631                         if (rdch) {
1632                                 struct snd_dbuf *bs = rdch->bufsoft;
1633
1634                                 CHN_LOCK(rdch);
1635                                 a->bytes = sndbuf_getready(bs);
1636                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1637                                 a->fragstotal = sndbuf_getblkcnt(bs);
1638                                 a->fragsize = sndbuf_getblksz(bs);
1639                                 CHN_UNLOCK(rdch);
1640                         } else
1641                                 ret = EINVAL;
1642                 }
1643                 break;
1644
1645         case SNDCTL_DSP_GETOSPACE:
1646                 /* return space available in the output queue */
1647                 {
1648                         audio_buf_info *a = (audio_buf_info *)arg;
1649                         if (wrch) {
1650                                 struct snd_dbuf *bs = wrch->bufsoft;
1651
1652                                 CHN_LOCK(wrch);
1653                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1654                                 a->bytes = sndbuf_getfree(bs);
1655                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1656                                 a->fragstotal = sndbuf_getblkcnt(bs);
1657                                 a->fragsize = sndbuf_getblksz(bs);
1658                                 CHN_UNLOCK(wrch);
1659                         } else
1660                                 ret = EINVAL;
1661                 }
1662                 break;
1663
1664         case SNDCTL_DSP_GETIPTR:
1665                 {
1666                         count_info *a = (count_info *)arg;
1667                         if (rdch) {
1668                                 struct snd_dbuf *bs = rdch->bufsoft;
1669
1670                                 CHN_LOCK(rdch);
1671                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1672                                 a->bytes = sndbuf_gettotal(bs);
1673                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1674                                 a->ptr = sndbuf_getfreeptr(bs);
1675                                 rdch->blocks = sndbuf_getblocks(bs);
1676                                 CHN_UNLOCK(rdch);
1677                         } else
1678                                 ret = EINVAL;
1679                 }
1680                 break;
1681
1682         case SNDCTL_DSP_GETOPTR:
1683                 {
1684                         count_info *a = (count_info *)arg;
1685                         if (wrch) {
1686                                 struct snd_dbuf *bs = wrch->bufsoft;
1687
1688                                 CHN_LOCK(wrch);
1689                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1690                                 a->bytes = sndbuf_gettotal(bs);
1691                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1692                                 a->ptr = sndbuf_getreadyptr(bs);
1693                                 wrch->blocks = sndbuf_getblocks(bs);
1694                                 CHN_UNLOCK(wrch);
1695                         } else
1696                                 ret = EINVAL;
1697                 }
1698                 break;
1699
1700         case SNDCTL_DSP_GETCAPS:
1701                 PCM_LOCK(d);
1702                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1703                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1704                         *arg_i |= PCM_CAP_DUPLEX;
1705                 if (rdch && (rdch->flags & CHN_F_VIRTUAL) != 0)
1706                         *arg_i |= PCM_CAP_VIRTUAL;
1707                 if (wrch && (wrch->flags & CHN_F_VIRTUAL) != 0)
1708                         *arg_i |= PCM_CAP_VIRTUAL;
1709                 PCM_UNLOCK(d);
1710                 break;
1711
1712         case SOUND_PCM_READ_BITS:
1713                 chn = wrch ? wrch : rdch;
1714                 if (chn) {
1715                         CHN_LOCK(chn);
1716                         if (chn->format & AFMT_8BIT)
1717                                 *arg_i = 8;
1718                         else if (chn->format & AFMT_16BIT)
1719                                 *arg_i = 16;
1720                         else if (chn->format & AFMT_24BIT)
1721                                 *arg_i = 24;
1722                         else if (chn->format & AFMT_32BIT)
1723                                 *arg_i = 32;
1724                         else
1725                                 ret = EINVAL;
1726                         CHN_UNLOCK(chn);
1727                 } else {
1728                         *arg_i = 0;
1729                         ret = EINVAL;
1730                 }
1731                 break;
1732
1733         case SNDCTL_DSP_SETTRIGGER:
1734                 if (rdch) {
1735                         CHN_LOCK(rdch);
1736                         rdch->flags &= ~CHN_F_NOTRIGGER;
1737                         if (*arg_i & PCM_ENABLE_INPUT)
1738                                 chn_start(rdch, 1);
1739                         else {
1740                                 chn_abort(rdch);
1741                                 chn_resetbuf(rdch);
1742                                 rdch->flags |= CHN_F_NOTRIGGER;
1743                         }
1744                         CHN_UNLOCK(rdch);
1745                 }
1746                 if (wrch) {
1747                         CHN_LOCK(wrch);
1748                         wrch->flags &= ~CHN_F_NOTRIGGER;
1749                         if (*arg_i & PCM_ENABLE_OUTPUT)
1750                                 chn_start(wrch, 1);
1751                         else {
1752                                 chn_abort(wrch);
1753                                 chn_resetbuf(wrch);
1754                                 wrch->flags |= CHN_F_NOTRIGGER;
1755                         }
1756                         CHN_UNLOCK(wrch);
1757                 }
1758                 break;
1759
1760         case SNDCTL_DSP_GETTRIGGER:
1761                 *arg_i = 0;
1762                 if (wrch) {
1763                         CHN_LOCK(wrch);
1764                         if (wrch->flags & CHN_F_TRIGGERED)
1765                                 *arg_i |= PCM_ENABLE_OUTPUT;
1766                         CHN_UNLOCK(wrch);
1767                 }
1768                 if (rdch) {
1769                         CHN_LOCK(rdch);
1770                         if (rdch->flags & CHN_F_TRIGGERED)
1771                                 *arg_i |= PCM_ENABLE_INPUT;
1772                         CHN_UNLOCK(rdch);
1773                 }
1774                 break;
1775
1776         case SNDCTL_DSP_GETODELAY:
1777                 if (wrch) {
1778                         struct snd_dbuf *bs = wrch->bufsoft;
1779
1780                         CHN_LOCK(wrch);
1781                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1782                         *arg_i = sndbuf_getready(bs);
1783                         CHN_UNLOCK(wrch);
1784                 } else
1785                         ret = EINVAL;
1786                 break;
1787
1788         case SNDCTL_DSP_POST:
1789                 if (wrch) {
1790                         CHN_LOCK(wrch);
1791                         wrch->flags &= ~CHN_F_NOTRIGGER;
1792                         chn_start(wrch, 1);
1793                         CHN_UNLOCK(wrch);
1794                 }
1795                 break;
1796
1797         case SNDCTL_DSP_SETDUPLEX:
1798                 /*
1799                  * switch to full-duplex mode if card is in half-duplex
1800                  * mode and is able to work in full-duplex mode
1801                  */
1802                 PCM_LOCK(d);
1803                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1804                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1805                 PCM_UNLOCK(d);
1806                 break;
1807
1808         /*
1809          * The following four ioctls are simple wrappers around mixer_ioctl
1810          * with no further processing.  xcmd is short for "translated
1811          * command".
1812          */
1813         case SNDCTL_DSP_GETRECVOL:
1814                 if (xcmd == 0) {
1815                         xcmd = SOUND_MIXER_READ_RECLEV;
1816                         chn = rdch;
1817                 }
1818                 /* FALLTHROUGH */
1819         case SNDCTL_DSP_SETRECVOL:
1820                 if (xcmd == 0) {
1821                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1822                         chn = rdch;
1823                 }
1824                 /* FALLTHROUGH */
1825         case SNDCTL_DSP_GETPLAYVOL:
1826                 if (xcmd == 0) {
1827                         xcmd = SOUND_MIXER_READ_PCM;
1828                         chn = wrch;
1829                 }
1830                 /* FALLTHROUGH */
1831         case SNDCTL_DSP_SETPLAYVOL:
1832                 if (xcmd == 0) {
1833                         xcmd = SOUND_MIXER_WRITE_PCM;
1834                         chn = wrch;
1835                 }
1836
1837                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1838                 if (ret != -1) {
1839                         PCM_GIANT_EXIT(d);
1840                         return (ret);
1841                 }
1842
1843                 if (d->mixer_dev != NULL) {
1844                         PCM_ACQUIRE_QUICK(d);
1845                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1846                             MIXER_CMD_DIRECT);
1847                         PCM_RELEASE_QUICK(d);
1848                 } else
1849                         ret = ENOTSUP;
1850
1851                 break;
1852
1853         case SNDCTL_DSP_GET_RECSRC_NAMES:
1854         case SNDCTL_DSP_GET_RECSRC:
1855         case SNDCTL_DSP_SET_RECSRC:
1856                 if (d->mixer_dev != NULL) {
1857                         PCM_ACQUIRE_QUICK(d);
1858                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1859                             MIXER_CMD_DIRECT);
1860                         PCM_RELEASE_QUICK(d);
1861                 } else
1862                         ret = ENOTSUP;
1863                 break;
1864
1865         /*
1866          * The following 3 ioctls aren't very useful at the moment.  For
1867          * now, only a single channel is associated with a cdev (/dev/dspN
1868          * instance), so there's only a single output routing to use (i.e.,
1869          * the wrch bound to this cdev).
1870          */
1871         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1872                 {
1873                         oss_mixer_enuminfo *ei;
1874                         ei = (oss_mixer_enuminfo *)arg;
1875                         ei->dev = 0;
1876                         ei->ctrl = 0;
1877                         ei->version = 0; /* static for now */
1878                         ei->strindex[0] = 0;
1879
1880                         if (wrch != NULL) {
1881                                 ei->nvalues = 1;
1882                                 strlcpy(ei->strings, wrch->name,
1883                                         sizeof(ei->strings));
1884                         } else {
1885                                 ei->nvalues = 0;
1886                                 ei->strings[0] = '\0';
1887                         }
1888                 }
1889                 break;
1890         case SNDCTL_DSP_GET_PLAYTGT:
1891         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1892                 /*
1893                  * Re: SET_PLAYTGT
1894                  *   OSSv4: "The value that was accepted by the device will
1895                  *   be returned back in the variable pointed by the
1896                  *   argument."
1897                  */
1898                 if (wrch != NULL)
1899                         *arg_i = 0;
1900                 else
1901                         ret = EINVAL;
1902                 break;
1903
1904         case SNDCTL_DSP_SILENCE:
1905         /*
1906          * Flush the software (pre-feed) buffer, but try to minimize playback
1907          * interruption.  (I.e., record unplayed samples with intent to
1908          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1909          * functionality.
1910          */
1911                 if (wrch == NULL)
1912                         ret = EINVAL;
1913                 else {
1914                         struct snd_dbuf *bs;
1915                         CHN_LOCK(wrch);
1916                         while (wrch->inprog != 0)
1917                                 cv_wait(&wrch->cv, wrch->lock);
1918                         bs = wrch->bufsoft;
1919                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1920                                 bs->sl = sndbuf_getready(bs);
1921                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1922                                 sndbuf_fillsilence(bs);
1923                                 chn_start(wrch, 0);
1924                         }
1925                         CHN_UNLOCK(wrch);
1926                 }
1927                 break;
1928
1929         case SNDCTL_DSP_SKIP:
1930         /*
1931          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1932          * playback buffer by moving the current write position immediately
1933          * before the point where the device is currently reading the samples."
1934          */
1935                 if (wrch == NULL)
1936                         ret = EINVAL;
1937                 else {
1938                         struct snd_dbuf *bs;
1939                         CHN_LOCK(wrch);
1940                         while (wrch->inprog != 0)
1941                                 cv_wait(&wrch->cv, wrch->lock);
1942                         bs = wrch->bufsoft;
1943                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1944                                 sndbuf_softreset(bs);
1945                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1946                                 bs->sl = 0;
1947                                 chn_start(wrch, 0);
1948                         }
1949                         CHN_UNLOCK(wrch);
1950                 }
1951                 break;
1952
1953         case SNDCTL_DSP_CURRENT_OPTR:
1954         case SNDCTL_DSP_CURRENT_IPTR:
1955         /**
1956          * @note Changing formats resets the buffer counters, which differs
1957          *       from the 4Front drivers.  However, I don't expect this to be
1958          *       much of a problem.
1959          *
1960          * @note In a test where @c CURRENT_OPTR is called immediately after write
1961          *       returns, this driver is about 32K samples behind whereas
1962          *       4Front's is about 8K samples behind.  Should determine source
1963          *       of discrepancy, even if only out of curiosity.
1964          *
1965          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1966          */
1967                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1968                 if (chn == NULL)
1969                         ret = EINVAL;
1970                 else {
1971                         struct snd_dbuf *bs;
1972                         /* int tmp; */
1973
1974                         oss_count_t *oc = (oss_count_t *)arg;
1975
1976                         CHN_LOCK(chn);
1977                         bs = chn->bufsoft;
1978 #if 0
1979                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1980                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1981                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1982 #else
1983                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1984                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1985 #endif
1986                         CHN_UNLOCK(chn);
1987                 }
1988                 break;
1989
1990         case SNDCTL_DSP_HALT_OUTPUT:
1991         case SNDCTL_DSP_HALT_INPUT:
1992                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1993                 if (chn == NULL)
1994                         ret = EINVAL;
1995                 else {
1996                         CHN_LOCK(chn);
1997                         chn_abort(chn);
1998                         CHN_UNLOCK(chn);
1999                 }
2000                 break;
2001
2002         case SNDCTL_DSP_LOW_WATER:
2003         /*
2004          * Set the number of bytes required to attract attention by
2005          * select/poll.
2006          */
2007                 if (wrch != NULL) {
2008                         CHN_LOCK(wrch);
2009                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
2010                         CHN_UNLOCK(wrch);
2011                 }
2012                 if (rdch != NULL) {
2013                         CHN_LOCK(rdch);
2014                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2015                         CHN_UNLOCK(rdch);
2016                 }
2017                 break;
2018
2019         case SNDCTL_DSP_GETERROR:
2020         /*
2021          * OSSv4 docs:  "All errors and counters will automatically be
2022          * cleared to zeroes after the call so each call will return only
2023          * the errors that occurred after the previous invocation. ... The
2024          * play_underruns and rec_overrun fields are the only useful fields
2025          * returned by OSS 4.0."
2026          */
2027                 {
2028                         audio_errinfo *ei = (audio_errinfo *)arg;
2029
2030                         bzero((void *)ei, sizeof(*ei));
2031
2032                         if (wrch != NULL) {
2033                                 CHN_LOCK(wrch);
2034                                 ei->play_underruns = wrch->xruns;
2035                                 wrch->xruns = 0;
2036                                 CHN_UNLOCK(wrch);
2037                         }
2038                         if (rdch != NULL) {
2039                                 CHN_LOCK(rdch);
2040                                 ei->rec_overruns = rdch->xruns;
2041                                 rdch->xruns = 0;
2042                                 CHN_UNLOCK(rdch);
2043                         }
2044                 }
2045                 break;
2046
2047         case SNDCTL_DSP_SYNCGROUP:
2048                 PCM_ACQUIRE_QUICK(d);
2049                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2050                 PCM_RELEASE_QUICK(d);
2051                 break;
2052
2053         case SNDCTL_DSP_SYNCSTART:
2054                 PCM_ACQUIRE_QUICK(d);
2055                 ret = dsp_oss_syncstart(*arg_i);
2056                 PCM_RELEASE_QUICK(d);
2057                 break;
2058
2059         case SNDCTL_DSP_POLICY:
2060                 PCM_ACQUIRE_QUICK(d);
2061                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2062                 PCM_RELEASE_QUICK(d);
2063                 break;
2064
2065         case SNDCTL_DSP_COOKEDMODE:
2066                 PCM_ACQUIRE_QUICK(d);
2067                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2068                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2069                 PCM_RELEASE_QUICK(d);
2070                 break;
2071         case SNDCTL_DSP_GET_CHNORDER:
2072                 PCM_ACQUIRE_QUICK(d);
2073                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2074                 PCM_RELEASE_QUICK(d);
2075                 break;
2076         case SNDCTL_DSP_SET_CHNORDER:
2077                 PCM_ACQUIRE_QUICK(d);
2078                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2079                 PCM_RELEASE_QUICK(d);
2080                 break;
2081         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2082                 PCM_ACQUIRE_QUICK(d);
2083                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2084                 PCM_RELEASE_QUICK(d);
2085                 break;
2086         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2087                 ret = EINVAL;
2088                 break;
2089 #ifdef  OSSV4_EXPERIMENT
2090         /*
2091          * XXX The following ioctls are not yet supported and just return
2092          * EINVAL.
2093          */
2094         case SNDCTL_DSP_GETOPEAKS:
2095         case SNDCTL_DSP_GETIPEAKS:
2096                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2097                 if (chn == NULL)
2098                         ret = EINVAL;
2099                 else {
2100                         oss_peaks_t *op = (oss_peaks_t *)arg;
2101                         int lpeak, rpeak;
2102
2103                         CHN_LOCK(chn);
2104                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2105                         if (ret == -1)
2106                                 ret = EINVAL;
2107                         else {
2108                                 (*op)[0] = lpeak;
2109                                 (*op)[1] = rpeak;
2110                         }
2111                         CHN_UNLOCK(chn);
2112                 }
2113                 break;
2114
2115         /*
2116          * XXX Once implemented, revisit this for proper cv protection
2117          *     (if necessary).
2118          */
2119         case SNDCTL_GETLABEL:
2120                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2121                 break;
2122         case SNDCTL_SETLABEL:
2123                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2124                 break;
2125         case SNDCTL_GETSONG:
2126                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2127                 break;
2128         case SNDCTL_SETSONG:
2129                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2130                 break;
2131         case SNDCTL_SETNAME:
2132                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2133                 break;
2134 #if 0
2135         /**
2136          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2137          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2138          * 4Front Technologies.
2139          */
2140         case SNDCTL_DSP_READCTL:
2141         case SNDCTL_DSP_WRITECTL:
2142                 ret = EINVAL;
2143                 break;
2144 #endif  /* !0 (explicitly omitted ioctls) */
2145
2146 #endif  /* !OSSV4_EXPERIMENT */
2147         case SNDCTL_DSP_MAPINBUF:
2148         case SNDCTL_DSP_MAPOUTBUF:
2149         case SNDCTL_DSP_SETSYNCRO:
2150                 /* undocumented */
2151
2152         case SNDCTL_DSP_SUBDIVIDE:
2153         case SOUND_PCM_WRITE_FILTER:
2154         case SOUND_PCM_READ_FILTER:
2155                 /* dunno what these do, don't sound important */
2156
2157         default:
2158                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2159                 ret = EINVAL;
2160                 break;
2161         }
2162
2163         PCM_GIANT_LEAVE(d);
2164
2165         return (ret);
2166 }
2167
2168 static int
2169 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2170 {
2171         struct snddev_info *d;
2172         struct pcm_channel *wrch, *rdch;
2173         int ret, e;
2174
2175         d = dsp_get_info(i_dev);
2176         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev)) {
2177                 /* XXX many clients don't understand POLLNVAL */
2178                 return (events & (POLLHUP | POLLPRI | POLLIN |
2179                     POLLRDNORM | POLLOUT | POLLWRNORM));
2180         }
2181         PCM_GIANT_ENTER(d);
2182
2183         wrch = NULL;
2184         rdch = NULL;
2185         ret = 0;
2186
2187         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2188
2189         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2190                 e = (events & (POLLOUT | POLLWRNORM));
2191                 if (e)
2192                         ret |= chn_poll(wrch, e, td);
2193         }
2194
2195         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2196                 e = (events & (POLLIN | POLLRDNORM));
2197                 if (e)
2198                         ret |= chn_poll(rdch, e, td);
2199         }
2200
2201         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2202
2203         PCM_GIANT_LEAVE(d);
2204
2205         return (ret);
2206 }
2207
2208 static int
2209 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
2210     int nprot, vm_memattr_t *memattr)
2211 {
2212
2213         /*
2214          * offset is in range due to checks in dsp_mmap_single().
2215          * XXX memattr is not honored.
2216          */
2217         *paddr = vtophys(offset);
2218         return (0);
2219 }
2220
2221 static int
2222 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
2223     vm_size_t size, struct vm_object **object, int nprot)
2224 {
2225         struct snddev_info *d;
2226         struct pcm_channel *wrch, *rdch, *c;
2227
2228         /*
2229          * Reject PROT_EXEC by default. It just doesn't makes sense.
2230          * Unfortunately, we have to give up this one due to linux_mmap
2231          * changes.
2232          *
2233          * https://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2234          *
2235          */
2236 #ifdef SV_ABI_LINUX
2237         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2238             (dsp_mmap_allow_prot_exec == 0 &&
2239             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2240 #else
2241         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2242 #endif
2243                 return (EINVAL);
2244
2245         /*
2246          * PROT_READ (alone) selects the input buffer.
2247          * PROT_WRITE (alone) selects the output buffer.
2248          * PROT_WRITE|PROT_READ together select the output buffer.
2249          */
2250         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2251                 return (EINVAL);
2252
2253         d = dsp_get_info(i_dev);
2254         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
2255                 return (EINVAL);
2256
2257         PCM_GIANT_ENTER(d);
2258
2259         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2260
2261         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2262         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2263             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2264             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2265             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2266                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2267                 PCM_GIANT_EXIT(d);
2268                 return (EINVAL);
2269         }
2270
2271         if (wrch != NULL)
2272                 wrch->flags |= CHN_F_MMAP;
2273         if (rdch != NULL)
2274                 rdch->flags |= CHN_F_MMAP;
2275
2276         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2277         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2278         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
2279             size, nprot, *offset, curthread->td_ucred);
2280
2281         PCM_GIANT_LEAVE(d);
2282
2283         if (*object == NULL)
2284                  return (EINVAL);
2285         return (0);
2286 }
2287
2288 /* So much for dev_stdclone() */
2289 static int
2290 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2291 {
2292         size_t len;
2293
2294         len = strlen(namep);
2295
2296         if (bcmp(name, namep, len) != 0)
2297                 return (ENODEV);
2298
2299         name += len;
2300
2301         if (isdigit(*name) == 0)
2302                 return (ENODEV);
2303
2304         len = strlen(sep);
2305
2306         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2307                 return (ENODEV);
2308
2309         for (*u = 0; isdigit(*name) != 0; name++) {
2310                 *u *= 10;
2311                 *u += *name - '0';
2312                 if (*u > dsp_umax)
2313                         return (ENODEV);
2314         }
2315
2316         if (*name == '\0')
2317                 return ((use_sep == 0) ? 0 : ENODEV);
2318
2319         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2320                 return (ENODEV);
2321
2322         name += len;
2323
2324         if (*name == '0' && name[1] != '\0')
2325                 return (ENODEV);
2326
2327         for (*c = 0; isdigit(*name) != 0; name++) {
2328                 *c *= 10;
2329                 *c += *name - '0';
2330                 if (*c > dsp_cmax)
2331                         return (ENODEV);
2332         }
2333
2334         if (*name != '\0')
2335                 return (ENODEV);
2336
2337         return (0);
2338 }
2339
2340 static void
2341 dsp_clone(void *arg,
2342     struct ucred *cred,
2343     char *name, int namelen, struct cdev **dev)
2344 {
2345         struct snddev_info *d;
2346         struct snd_clone_entry *ce;
2347         struct pcm_channel *c;
2348         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2349         char *devname, *devcmp, *devsep;
2350
2351         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2352
2353         if (*dev != NULL)
2354                 return;
2355
2356         unit = -1;
2357         cunit = -1;
2358         devtype = -1;
2359         devhw = 0;
2360         devcmax = -1;
2361         tumax = -1;
2362         devname = NULL;
2363         devsep = NULL;
2364
2365         for (i = 0; unit == -1 &&
2366             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2367                 devtype = dsp_cdevs[i].type;
2368                 devcmp = dsp_cdevs[i].name;
2369                 devsep = dsp_cdevs[i].sep;
2370                 devname = dsp_cdevs[i].alias;
2371                 if (devname == NULL)
2372                         devname = devcmp;
2373                 devhw = dsp_cdevs[i].hw;
2374                 devcmax = dsp_cdevs[i].max - 1;
2375                 if (strcmp(name, devcmp) == 0) {
2376                         if (dsp_basename_clone != 0)
2377                                 unit = snd_unit;
2378                 } else if (dsp_stdclone(name, devcmp, devsep,
2379                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2380                         unit = -1;
2381                         cunit = -1;
2382                 }
2383         }
2384
2385         d = devclass_get_softc(pcm_devclass, unit);
2386         if (!PCM_REGISTERED(d) || d->clones == NULL)
2387                 return;
2388
2389         /* XXX Need Giant magic entry ??? */
2390
2391         PCM_LOCK(d);
2392         if (snd_clone_disabled(d->clones)) {
2393                 PCM_UNLOCK(d);
2394                 return;
2395         }
2396
2397         PCM_WAIT(d);
2398         PCM_ACQUIRE(d);
2399         PCM_UNLOCK(d);
2400
2401         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2402
2403         if (devhw != 0) {
2404                 KASSERT(devcmax <= dsp_cmax,
2405                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2406                 if (cunit > devcmax) {
2407                         PCM_RELEASE_QUICK(d);
2408                         return;
2409                 }
2410                 udcmask |= snd_c2unit(cunit);
2411                 CHN_FOREACH(c, d, channels.pcm) {
2412                         CHN_LOCK(c);
2413                         if (c->unit != udcmask) {
2414                                 CHN_UNLOCK(c);
2415                                 continue;
2416                         }
2417                         CHN_UNLOCK(c);
2418                         udcmask &= ~snd_c2unit(cunit);
2419                         /*
2420                          * Temporarily increase clone maxunit to overcome
2421                          * vchan flexibility.
2422                          *
2423                          * # sysctl dev.pcm.0.play.vchans=256
2424                          * dev.pcm.0.play.vchans: 1 -> 256
2425                          * # cat /dev/zero > /dev/dsp0.vp255 &
2426                          * [1] 17296
2427                          * # sysctl dev.pcm.0.play.vchans=0
2428                          * dev.pcm.0.play.vchans: 256 -> 1
2429                          * # fg
2430                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2431                          * ^C
2432                          * # cat /dev/zero > /dev/dsp0.vp255
2433                          * zsh: operation not supported: /dev/dsp0.vp255
2434                          */
2435                         tumax = snd_clone_getmaxunit(d->clones);
2436                         if (cunit > tumax)
2437                                 snd_clone_setmaxunit(d->clones, cunit);
2438                         else
2439                                 tumax = -1;
2440                         goto dsp_clone_alloc;
2441                 }
2442                 /*
2443                  * Ok, so we're requesting unallocated vchan, but still
2444                  * within maximum vchan limit.
2445                  */
2446                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2447                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2448                     cunit < snd_maxautovchans) {
2449                         udcmask &= ~snd_c2unit(cunit);
2450                         tumax = snd_clone_getmaxunit(d->clones);
2451                         if (cunit > tumax)
2452                                 snd_clone_setmaxunit(d->clones, cunit);
2453                         else
2454                                 tumax = -1;
2455                         goto dsp_clone_alloc;
2456                 }
2457                 PCM_RELEASE_QUICK(d);
2458                 return;
2459         }
2460
2461 dsp_clone_alloc:
2462         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2463         if (tumax != -1)
2464                 snd_clone_setmaxunit(d->clones, tumax);
2465         if (ce != NULL) {
2466                 udcmask |= snd_c2unit(cunit);
2467                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2468                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2469                     devname, unit, devsep, cunit);
2470                 snd_clone_register(ce, *dev);
2471         }
2472
2473         PCM_RELEASE_QUICK(d);
2474
2475         if (*dev != NULL)
2476                 dev_ref(*dev);
2477 }
2478
2479 static void
2480 dsp_sysinit(void *p)
2481 {
2482         if (dsp_ehtag != NULL)
2483                 return;
2484         /* initialize unit numbering */
2485         snd_unit_init();
2486         dsp_umax = PCMMAXUNIT;
2487         dsp_cmax = PCMMAXCHAN;
2488         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2489 }
2490
2491 static void
2492 dsp_sysuninit(void *p)
2493 {
2494         if (dsp_ehtag == NULL)
2495                 return;
2496         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2497         dsp_ehtag = NULL;
2498 }
2499
2500 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2501 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2502
2503 char *
2504 dsp_unit2name(char *buf, size_t len, int unit)
2505 {
2506         int i, dtype;
2507
2508         KASSERT(buf != NULL && len != 0,
2509             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2510
2511         dtype = snd_unit2d(unit);
2512
2513         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2514                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2515                         continue;
2516                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2517                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2518                 return (buf);
2519         }
2520
2521         return (NULL);
2522 }
2523
2524 /**
2525  * @brief Handler for SNDCTL_AUDIOINFO.
2526  *
2527  * Gathers information about the audio device specified in ai->dev.  If
2528  * ai->dev == -1, then this function gathers information about the current
2529  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2530  * return EINVAL.
2531  *
2532  * This routine is supposed to go practically straight to the hardware,
2533  * getting capabilities directly from the sound card driver, side-stepping
2534  * the intermediate channel interface.
2535  *
2536  * Note, however, that the usefulness of this command is significantly
2537  * decreased when requesting info about any device other than the one serving
2538  * the request. While each snddev_channel refers to a specific device node,
2539  * the converse is *not* true.  Currently, when a sound device node is opened,
2540  * the sound subsystem scans for an available audio channel (or channels, if
2541  * opened in read+write) and then assigns them to the si_drv[12] private
2542  * data fields.  As a result, any information returned linking a channel to
2543  * a specific character device isn't necessarily accurate.
2544  *
2545  * @note
2546  * Calling threads must not hold any snddev_info or pcm_channel locks.
2547  *
2548  * @param dev           device on which the ioctl was issued
2549  * @param ai            ioctl request data container
2550  *
2551  * @retval 0            success
2552  * @retval EINVAL       ai->dev specifies an invalid device
2553  *
2554  * @todo Verify correctness of Doxygen tags.  ;)
2555  */
2556 int
2557 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2558 {
2559         struct pcmchan_caps *caps;
2560         struct pcm_channel *ch;
2561         struct snddev_info *d;
2562         uint32_t fmts;
2563         int i, nchan, *rates, minch, maxch;
2564         char *devname, buf[CHN_NAMELEN];
2565
2566         /*
2567          * If probing the device that received the ioctl, make sure it's a
2568          * DSP device.  (Users may use this ioctl with /dev/mixer and
2569          * /dev/midi.)
2570          */
2571         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2572                 return (EINVAL);
2573
2574         ch = NULL;
2575         devname = NULL;
2576         nchan = 0;
2577         bzero(buf, sizeof(buf));
2578
2579         /*
2580          * Search for the requested audio device (channel).  Start by
2581          * iterating over pcm devices.
2582          */
2583         for (i = 0; pcm_devclass != NULL &&
2584             i < devclass_get_maxunit(pcm_devclass); i++) {
2585                 d = devclass_get_softc(pcm_devclass, i);
2586                 if (!PCM_REGISTERED(d))
2587                         continue;
2588
2589                 /* XXX Need Giant magic entry ??? */
2590
2591                 /* See the note in function docblock */
2592                 PCM_UNLOCKASSERT(d);
2593                 PCM_LOCK(d);
2594
2595                 CHN_FOREACH(ch, d, channels.pcm) {
2596                         CHN_UNLOCKASSERT(ch);
2597                         CHN_LOCK(ch);
2598                         if (ai->dev == -1) {
2599                                 if (DSP_REGISTERED(d, i_dev) &&
2600                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2601                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2602                                         devname = dsp_unit2name(buf,
2603                                             sizeof(buf), ch->unit);
2604                                 }
2605                         } else if (ai->dev == nchan) {
2606                                 devname = dsp_unit2name(buf, sizeof(buf),
2607                                     ch->unit);
2608                         }
2609                         if (devname != NULL)
2610                                 break;
2611                         CHN_UNLOCK(ch);
2612                         ++nchan;
2613                 }
2614
2615                 if (devname != NULL) {
2616                         /*
2617                          * At this point, the following synchronization stuff
2618                          * has happened:
2619                          * - a specific PCM device is locked.
2620                          * - a specific audio channel has been locked, so be
2621                          *   sure to unlock when exiting;
2622                          */
2623
2624                         caps = chn_getcaps(ch);
2625
2626                         /*
2627                          * With all handles collected, zero out the user's
2628                          * container and begin filling in its fields.
2629                          */
2630                         bzero((void *)ai, sizeof(oss_audioinfo));
2631
2632                         ai->dev = nchan;
2633                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2634
2635                         if ((ch->flags & CHN_F_BUSY) == 0)
2636                                 ai->busy = 0;
2637                         else
2638                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2639
2640                         /**
2641                          * @note
2642                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2643                          *    this moment." Cop-out, I know, but I'll save
2644                          *    running around in the process table for later.
2645                          *    Is there a risk of leaking information?
2646                          */
2647                         ai->pid = ch->pid;
2648
2649                         /*
2650                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2651                          * Note, however, that a single channel operates in
2652                          * only one direction, so PCM_CAP_DUPLEX is out.
2653                          */
2654                         /**
2655                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2656                          *       these in pcmchan::caps?
2657                          */
2658                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2659                             ((ch->flags & CHN_F_VIRTUAL) ? PCM_CAP_VIRTUAL : 0) |
2660                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2661
2662                         /*
2663                          * Collect formats supported @b natively by the
2664                          * device.  Also determine min/max channels.  (I.e.,
2665                          * mono, stereo, or both?)
2666                          *
2667                          * If any channel is stereo, maxch = 2;
2668                          * if all channels are stereo, minch = 2, too;
2669                          * if any channel is mono, minch = 1;
2670                          * and if all channels are mono, maxch = 1.
2671                          */
2672                         minch = 0;
2673                         maxch = 0;
2674                         fmts = 0;
2675                         for (i = 0; caps->fmtlist[i]; i++) {
2676                                 fmts |= caps->fmtlist[i];
2677                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2678                                         minch = (minch == 0) ? 2 : minch;
2679                                         maxch = 2;
2680                                 } else {
2681                                         minch = 1;
2682                                         maxch = (maxch == 0) ? 1 : maxch;
2683                                 }
2684                         }
2685
2686                         if (ch->direction == PCMDIR_PLAY)
2687                                 ai->oformats = fmts;
2688                         else
2689                                 ai->iformats = fmts;
2690
2691                         /**
2692                          * @note
2693                          * @c magic - OSSv4 docs: "Reserved for internal use
2694                          *    by OSS."
2695                          *
2696                          * @par
2697                          * @c card_number - OSSv4 docs: "Number of the sound
2698                          *    card where this device belongs or -1 if this
2699                          *    information is not available.  Applications
2700                          *    should normally not use this field for any
2701                          *    purpose."
2702                          */
2703                         ai->card_number = -1;
2704                         /**
2705                          * @todo @c song_name - depends first on
2706                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2707                          *          on SNDCTL_[GS]ETLABEL
2708                          * @todo @c port_number - routing information?
2709                          */
2710                         ai->port_number = -1;
2711                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2712                         /**
2713                          * @note
2714                          * @c real_device - OSSv4 docs:  "Obsolete."
2715                          */
2716                         ai->real_device = -1;
2717                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2718                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2719                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2720                         /**
2721                          * @note
2722                          * @c flags - OSSv4 docs: "Reserved for future use."
2723                          *
2724                          * @note
2725                          * @c binding - OSSv4 docs: "Reserved for future use."
2726                          *
2727                          * @todo @c handle - haven't decided how to generate
2728                          *       this yet; bus, vendor, device IDs?
2729                          */
2730                         ai->min_rate = caps->minspeed;
2731                         ai->max_rate = caps->maxspeed;
2732
2733                         ai->min_channels = minch;
2734                         ai->max_channels = maxch;
2735
2736                         ai->nrates = chn_getrates(ch, &rates);
2737                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2738                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2739
2740                         for (i = 0; i < ai->nrates; i++)
2741                                 ai->rates[i] = rates[i];
2742
2743                         ai->next_play_engine = 0;
2744                         ai->next_rec_engine = 0;
2745
2746                         CHN_UNLOCK(ch);
2747                 }
2748
2749                 PCM_UNLOCK(d);
2750
2751                 if (devname != NULL)
2752                         return (0);
2753         }
2754
2755         /* Exhausted the search -- nothing is locked, so return. */
2756         return (EINVAL);
2757 }
2758
2759 /**
2760  * @brief Assigns a PCM channel to a sync group.
2761  *
2762  * Sync groups are used to enable audio operations on multiple devices
2763  * simultaneously.  They may be used with any number of devices and may
2764  * span across applications.  Devices are added to groups with
2765  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2766  * SNDCTL_DSP_SYNCSTART ioctl.
2767  *
2768  * If the @c id field of the @c group parameter is set to zero, then a new
2769  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2770  * the group specified.
2771  *
2772  * @todo As far as memory allocation, should we assume that things are
2773  *       okay and allocate with M_WAITOK before acquiring channel locks,
2774  *       freeing later if not?
2775  *
2776  * @param wrch  output channel associated w/ device (if any)
2777  * @param rdch  input channel associated w/ device (if any)
2778  * @param group Sync group parameters
2779  *
2780  * @retval 0            success
2781  * @retval non-zero     error to be propagated upstream
2782  */
2783 static int
2784 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2785 {
2786         struct pcmchan_syncmember *smrd, *smwr;
2787         struct pcmchan_syncgroup *sg;
2788         int ret, sg_ids[3];
2789
2790         smrd = NULL;
2791         smwr = NULL;
2792         sg = NULL;
2793         ret = 0;
2794
2795         /*
2796          * Free_unr() may sleep, so store released syncgroup IDs until after
2797          * all locks are released.
2798          */
2799         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2800
2801         PCM_SG_LOCK();
2802
2803         /*
2804          * - Insert channel(s) into group's member list.
2805          * - Set CHN_F_NOTRIGGER on channel(s).
2806          * - Stop channel(s).
2807          */
2808
2809         /*
2810          * If device's channels are already mapped to a group, unmap them.
2811          */
2812         if (wrch) {
2813                 CHN_LOCK(wrch);
2814                 sg_ids[0] = chn_syncdestroy(wrch);
2815         }
2816
2817         if (rdch) {
2818                 CHN_LOCK(rdch);
2819                 sg_ids[1] = chn_syncdestroy(rdch);
2820         }
2821
2822         /*
2823          * Verify that mode matches character device properites.
2824          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2825          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2826          */
2827         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2828             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2829                 ret = EINVAL;
2830                 goto out;
2831         }
2832
2833         /*
2834          * An id of zero indicates the user wants to create a new
2835          * syncgroup.
2836          */
2837         if (group->id == 0) {
2838                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2839                 if (sg != NULL) {
2840                         SLIST_INIT(&sg->members);
2841                         sg->id = alloc_unr(pcmsg_unrhdr);
2842
2843                         group->id = sg->id;
2844                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2845                 } else
2846                         ret = ENOMEM;
2847         } else {
2848                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2849                         if (sg->id == group->id)
2850                                 break;
2851                 }
2852                 if (sg == NULL)
2853                         ret = EINVAL;
2854         }
2855
2856         /* Couldn't create or find a syncgroup.  Fail. */
2857         if (sg == NULL)
2858                 goto out;
2859
2860         /*
2861          * Allocate a syncmember, assign it and a channel together, and
2862          * insert into syncgroup.
2863          */
2864         if (group->mode & PCM_ENABLE_INPUT) {
2865                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2866                 if (smrd == NULL) {
2867                         ret = ENOMEM;
2868                         goto out;
2869                 }
2870
2871                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2872                 smrd->parent = sg;
2873                 smrd->ch = rdch;
2874
2875                 chn_abort(rdch);
2876                 rdch->flags |= CHN_F_NOTRIGGER;
2877                 rdch->sm = smrd;
2878         }
2879
2880         if (group->mode & PCM_ENABLE_OUTPUT) {
2881                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2882                 if (smwr == NULL) {
2883                         ret = ENOMEM;
2884                         goto out;
2885                 }
2886
2887                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2888                 smwr->parent = sg;
2889                 smwr->ch = wrch;
2890
2891                 chn_abort(wrch);
2892                 wrch->flags |= CHN_F_NOTRIGGER;
2893                 wrch->sm = smwr;
2894         }
2895
2896 out:
2897         if (ret != 0) {
2898                 if (smrd != NULL)
2899                         free(smrd, M_DEVBUF);
2900                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2901                         sg_ids[2] = sg->id;
2902                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2903                         free(sg, M_DEVBUF);
2904                 }
2905
2906                 if (wrch)
2907                         wrch->sm = NULL;
2908                 if (rdch)
2909                         rdch->sm = NULL;
2910         }
2911
2912         if (wrch)
2913                 CHN_UNLOCK(wrch);
2914         if (rdch)
2915                 CHN_UNLOCK(rdch);
2916
2917         PCM_SG_UNLOCK();
2918
2919         if (sg_ids[0])
2920                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2921         if (sg_ids[1])
2922                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2923         if (sg_ids[2])
2924                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2925
2926         return (ret);
2927 }
2928
2929 /**
2930  * @brief Launch a sync group into action
2931  *
2932  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2933  * iterates over all members, triggering them along the way.
2934  *
2935  * @note Caller must not hold any channel locks.
2936  *
2937  * @param sg_id sync group identifier
2938  *
2939  * @retval 0    success
2940  * @retval non-zero     error worthy of propagating upstream to user
2941  */
2942 static int
2943 dsp_oss_syncstart(int sg_id)
2944 {
2945         struct pcmchan_syncmember *sm, *sm_tmp;
2946         struct pcmchan_syncgroup *sg;
2947         struct pcm_channel *c;
2948         int ret, needlocks;
2949
2950         /* Get the synclists lock */
2951         PCM_SG_LOCK();
2952
2953         do {
2954                 ret = 0;
2955                 needlocks = 0;
2956
2957                 /* Search for syncgroup by ID */
2958                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2959                         if (sg->id == sg_id)
2960                                 break;
2961                 }
2962
2963                 /* Return EINVAL if not found */
2964                 if (sg == NULL) {
2965                         ret = EINVAL;
2966                         break;
2967                 }
2968
2969                 /* Any removals resulting in an empty group should've handled this */
2970                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2971
2972                 /*
2973                  * Attempt to lock all member channels - if any are already
2974                  * locked, unlock those acquired, sleep for a bit, and try
2975                  * again.
2976                  */
2977                 SLIST_FOREACH(sm, &sg->members, link) {
2978                         if (CHN_TRYLOCK(sm->ch) == 0) {
2979                                 int timo = hz * 5/1000;
2980                                 if (timo < 1)
2981                                         timo = 1;
2982
2983                                 /* Release all locked channels so far, retry */
2984                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2985                                         /* sm is the member already locked */
2986                                         if (sm == sm_tmp)
2987                                                 break;
2988                                         CHN_UNLOCK(sm_tmp->ch);
2989                                 }
2990
2991                                 /** @todo Is PRIBIO correct/ */
2992                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2993                                     PRIBIO | PCATCH, "pcmsg", timo);
2994                                 if (ret == EINTR || ret == ERESTART)
2995                                         break;
2996
2997                                 needlocks = 1;
2998                                 ret = 0; /* Assumes ret == EAGAIN... */
2999                         }
3000                 }
3001         } while (needlocks && ret == 0);
3002
3003         /* Proceed only if no errors encountered. */
3004         if (ret == 0) {
3005                 /* Launch channels */
3006                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
3007                         SLIST_REMOVE_HEAD(&sg->members, link);
3008
3009                         c = sm->ch;
3010                         c->sm = NULL;
3011                         chn_start(c, 1);
3012                         c->flags &= ~CHN_F_NOTRIGGER;
3013                         CHN_UNLOCK(c);
3014
3015                         free(sm, M_DEVBUF);
3016                 }
3017
3018                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3019                 free(sg, M_DEVBUF);
3020         }
3021
3022         PCM_SG_UNLOCK();
3023
3024         /*
3025          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3026          * first.
3027          */
3028         if (ret == 0)
3029                 free_unr(pcmsg_unrhdr, sg_id);
3030
3031         return (ret);
3032 }
3033
3034 /**
3035  * @brief Handler for SNDCTL_DSP_POLICY
3036  *
3037  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3038  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3039  * specifying those two parameters, s/he simply selects a number from 0..10
3040  * which corresponds to a buffer size.  Smaller numbers request smaller
3041  * buffers with lower latencies (at greater overhead from more frequent
3042  * interrupts), while greater numbers behave in the opposite manner.
3043  *
3044  * The 4Front spec states that a value of 5 should be the default.  However,
3045  * this implementation deviates slightly by using a linear scale without
3046  * consulting drivers.  I.e., even though drivers may have different default
3047  * buffer sizes, a policy argument of 5 will have the same result across
3048  * all drivers.
3049  *
3050  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3051  * more information.
3052  *
3053  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3054  *       work with hardware drivers directly.
3055  *
3056  * @note PCM channel arguments must not be locked by caller.
3057  *
3058  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3059  * @param rdch  " recording channel (optional; may be NULL)
3060  * @param policy Integer from [0:10]
3061  *
3062  * @retval 0    constant (for now)
3063  */
3064 static int
3065 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3066 {
3067         int ret;
3068
3069         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3070                 return (EIO);
3071
3072         /* Default: success */
3073         ret = 0;
3074
3075         if (rdch) {
3076                 CHN_LOCK(rdch);
3077                 ret = chn_setlatency(rdch, policy);
3078                 CHN_UNLOCK(rdch);
3079         }
3080
3081         if (wrch && ret == 0) {
3082                 CHN_LOCK(wrch);
3083                 ret = chn_setlatency(wrch, policy);
3084                 CHN_UNLOCK(wrch);
3085         }
3086
3087         if (ret)
3088                 ret = EIO;
3089
3090         return (ret);
3091 }
3092
3093 /**
3094  * @brief Enable or disable "cooked" mode
3095  *
3096  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3097  * is the default, the sound system handles rate and format conversions
3098  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3099  * operates with 44100Hz/16bit/signed samples).
3100  *
3101  * Disabling cooked mode is intended for applications wanting to mmap()
3102  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3103  * feeder architecture, presumably to gain as much control over audio
3104  * hardware as possible.
3105  *
3106  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3107  * for more details.
3108  *
3109  * @param wrch          playback channel (optional; may be NULL)
3110  * @param rdch          recording channel (optional; may be NULL)
3111  * @param enabled       0 = raw mode, 1 = cooked mode
3112  *
3113  * @retval EINVAL       Operation not yet supported.
3114  */
3115 static int
3116 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3117 {
3118
3119         /*
3120          * XXX I just don't get it. Why don't they call it
3121          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3122          * This is just plain so confusing, incoherent,
3123          * <insert any non-printable characters here>.
3124          */
3125         if (!(enabled == 1 || enabled == 0))
3126                 return (EINVAL);
3127
3128         /*
3129          * I won't give in. I'm inverting its logic here and now.
3130          * Brag all you want, but "BITPERFECT" should be the better
3131          * term here.
3132          */
3133         enabled ^= 0x00000001;
3134
3135         if (wrch != NULL) {
3136                 CHN_LOCK(wrch);
3137                 wrch->flags &= ~CHN_F_BITPERFECT;
3138                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3139                 CHN_UNLOCK(wrch);
3140         }
3141
3142         if (rdch != NULL) {
3143                 CHN_LOCK(rdch);
3144                 rdch->flags &= ~CHN_F_BITPERFECT;
3145                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3146                 CHN_UNLOCK(rdch);
3147         }
3148
3149         return (0);
3150 }
3151
3152 /**
3153  * @brief Retrieve channel interleaving order
3154  *
3155  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3156  *
3157  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3158  * for more details.
3159  *
3160  * @note As the ioctl definition is still under construction, FreeBSD
3161  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3162  *
3163  * @param wrch  playback channel (optional; may be NULL)
3164  * @param rdch  recording channel (optional; may be NULL)
3165  * @param map   channel map (result will be stored there)
3166  *
3167  * @retval EINVAL       Operation not yet supported.
3168  */
3169 static int
3170 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3171 {
3172         struct pcm_channel *ch;
3173         int ret;
3174
3175         ch = (wrch != NULL) ? wrch : rdch;
3176         if (ch != NULL) {
3177                 CHN_LOCK(ch);
3178                 ret = chn_oss_getorder(ch, map);
3179                 CHN_UNLOCK(ch);
3180         } else
3181                 ret = EINVAL;
3182
3183         return (ret);
3184 }
3185
3186 /**
3187  * @brief Specify channel interleaving order
3188  *
3189  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3190  *
3191  * @note As the ioctl definition is still under construction, FreeBSD
3192  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3193  *
3194  * @param wrch  playback channel (optional; may be NULL)
3195  * @param rdch  recording channel (optional; may be NULL)
3196  * @param map   channel map
3197  *
3198  * @retval EINVAL       Operation not yet supported.
3199  */
3200 static int
3201 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3202 {
3203         int ret;
3204
3205         ret = 0;
3206
3207         if (wrch != NULL) {
3208                 CHN_LOCK(wrch);
3209                 ret = chn_oss_setorder(wrch, map);
3210                 CHN_UNLOCK(wrch);
3211         }
3212
3213         if (ret == 0 && rdch != NULL) {
3214                 CHN_LOCK(rdch);
3215                 ret = chn_oss_setorder(rdch, map);
3216                 CHN_UNLOCK(rdch);
3217         }
3218
3219         return (ret);
3220 }
3221
3222 static int
3223 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3224     int *mask)
3225 {
3226         struct pcm_channel *ch;
3227         uint32_t chnmask;
3228         int ret;
3229
3230         chnmask = 0;
3231         ch = (wrch != NULL) ? wrch : rdch;
3232
3233         if (ch != NULL) {
3234                 CHN_LOCK(ch);
3235                 ret = chn_oss_getmask(ch, &chnmask);
3236                 CHN_UNLOCK(ch);
3237         } else
3238                 ret = EINVAL;
3239
3240         if (ret == 0)
3241                 *mask = chnmask;
3242
3243         return (ret);
3244 }
3245
3246 #ifdef OSSV4_EXPERIMENT
3247 /**
3248  * @brief Retrieve an audio device's label
3249  *
3250  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3251  *
3252  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3253  * for more details.
3254  *
3255  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3256  * consoles) can show variable "labels" for certain controls. By default
3257  * the application name (say quake) is shown as the label but
3258  * applications may change the labels themselves."
3259  *
3260  * @note As the ioctl definition is still under construction, FreeBSD
3261  *       does not currently support @c SNDCTL_GETLABEL.
3262  *
3263  * @param wrch  playback channel (optional; may be NULL)
3264  * @param rdch  recording channel (optional; may be NULL)
3265  * @param label label gets copied here
3266  *
3267  * @retval EINVAL       Operation not yet supported.
3268  */
3269 static int
3270 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3271 {
3272         return (EINVAL);
3273 }
3274
3275 /**
3276  * @brief Specify an audio device's label
3277  *
3278  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3279  * comments for @c dsp_oss_getlabel immediately above.
3280  *
3281  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3282  * for more details.
3283  *
3284  * @note As the ioctl definition is still under construction, FreeBSD
3285  *       does not currently support SNDCTL_SETLABEL.
3286  *
3287  * @param wrch  playback channel (optional; may be NULL)
3288  * @param rdch  recording channel (optional; may be NULL)
3289  * @param label label gets copied from here
3290  *
3291  * @retval EINVAL       Operation not yet supported.
3292  */
3293 static int
3294 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3295 {
3296         return (EINVAL);
3297 }
3298
3299 /**
3300  * @brief Retrieve name of currently played song
3301  *
3302  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3303  * tell the system the name of the currently playing song, which would be
3304  * visible in @c /dev/sndstat.
3305  *
3306  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3307  * for more details.
3308  *
3309  * @note As the ioctl definition is still under construction, FreeBSD
3310  *       does not currently support SNDCTL_GETSONG.
3311  *
3312  * @param wrch  playback channel (optional; may be NULL)
3313  * @param rdch  recording channel (optional; may be NULL)
3314  * @param song  song name gets copied here
3315  *
3316  * @retval EINVAL       Operation not yet supported.
3317  */
3318 static int
3319 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3320 {
3321         return (EINVAL);
3322 }
3323
3324 /**
3325  * @brief Retrieve name of currently played song
3326  *
3327  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3328  * tell the system the name of the currently playing song, which would be
3329  * visible in @c /dev/sndstat.
3330  *
3331  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3332  * for more details.
3333  *
3334  * @note As the ioctl definition is still under construction, FreeBSD
3335  *       does not currently support SNDCTL_SETSONG.
3336  *
3337  * @param wrch  playback channel (optional; may be NULL)
3338  * @param rdch  recording channel (optional; may be NULL)
3339  * @param song  song name gets copied from here
3340  *
3341  * @retval EINVAL       Operation not yet supported.
3342  */
3343 static int
3344 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3345 {
3346         return (EINVAL);
3347 }
3348
3349 /**
3350  * @brief Rename a device
3351  *
3352  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3353  *
3354  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3355  * more details.
3356  *
3357  * From Hannu@4Front:  "This call is used to change the device name
3358  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3359  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3360  * name depending on the current context (for example 'OSS virtual wave table
3361  * synth' or 'VoIP link to London')."
3362  *
3363  * @note As the ioctl definition is still under construction, FreeBSD
3364  *       does not currently support SNDCTL_SETNAME.
3365  *
3366  * @param wrch  playback channel (optional; may be NULL)
3367  * @param rdch  recording channel (optional; may be NULL)
3368  * @param name  new device name gets copied from here
3369  *
3370  * @retval EINVAL       Operation not yet supported.
3371  */
3372 static int
3373 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3374 {
3375         return (EINVAL);
3376 }
3377 #endif  /* !OSSV4_EXPERIMENT */