sys/dev/sound/pcm/dsp.c

   1 /*-
   2  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
   3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
   4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifdef HAVE_KERNEL_OPTION_HEADERS
  30 #include "opt_snd.h"
  31 #endif
  32
  33 #include <dev/sound/pcm/sound.h>
  34 #include <sys/ctype.h>
  35 #include <sys/sysent.h>
  36
  37 #include <vm/vm.h>
  38 #include <vm/vm_object.h>
  39 #include <vm/vm_page.h>
  40 #include <vm/vm_pager.h>
  41
  42 SND_DECLARE_FILE("$FreeBSD$");
  43
  44 static int dsp_mmap_allow_prot_exec = 0;
  45 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
  46     &dsp_mmap_allow_prot_exec, 0,
  47     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
  48
  49 struct dsp_cdevinfo {
  50         struct pcm_channel *rdch, *wrch;
  51         struct pcm_channel *volch;
  52         int busy, simplex;
  53         TAILQ_ENTRY(dsp_cdevinfo) link;
  54 };
  55
  56 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  57 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  58 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  59 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  60
  61 #define DSP_CDEVINFO_CACHESIZE  8
  62
  63 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  64                                  (y) != NULL && (y)->si_drv1 != NULL)
  65
  66 #define OLDPCM_IOCTL
  67
  68 static d_open_t dsp_open;
  69 static d_close_t dsp_close;
  70 static d_read_t dsp_read;
  71 static d_write_t dsp_write;
  72 static d_ioctl_t dsp_ioctl;
  73 static d_poll_t dsp_poll;
  74 static d_mmap_t dsp_mmap;
  75 static d_mmap_single_t dsp_mmap_single;
  76
  77 struct cdevsw dsp_cdevsw = {
  78         .d_version =    D_VERSION,
  79         .d_open =       dsp_open,
  80         .d_close =      dsp_close,
  81         .d_read =       dsp_read,
  82         .d_write =      dsp_write,
  83         .d_ioctl =      dsp_ioctl,
  84         .d_poll =       dsp_poll,
  85         .d_mmap =       dsp_mmap,
  86         .d_mmap_single = dsp_mmap_single,
  87         .d_name =       "dsp",
  88 };
  89
  90 static eventhandler_tag dsp_ehtag = NULL;
  91 static int dsp_umax = -1;
  92 static int dsp_cmax = -1;
  93
  94 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
  95 static int dsp_oss_syncstart(int sg_id);
  96 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
  97 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
  98 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  99 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 100 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
 101 #ifdef OSSV4_EXPERIMENT
 102 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 103 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 104 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 105 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 106 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 107 #endif
 108
 109 static struct snddev_info *
 110 dsp_get_info(struct cdev *dev)
 111 {
 112         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 113 }
 114
 115 static uint32_t
 116 dsp_get_flags(struct cdev *dev)
 117 {
 118         device_t bdev;
 119
 120         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 121
 122         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 123 }
 124
 125 static void
 126 dsp_set_flags(struct cdev *dev, uint32_t flags)
 127 {
 128         device_t bdev;
 129
 130         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 131
 132         if (bdev != NULL)
 133                 pcm_setflags(bdev, flags);
 134 }
 135
 136 /*
 137  * return the channels associated with an open device instance.
 138  * lock channels specified.
 139  */
 140 static int
 141 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 142     uint32_t prio)
 143 {
 144         struct snddev_info *d;
 145         struct pcm_channel *ch;
 146         uint32_t flags;
 147
 148         if (PCM_SIMPLEX(dev) != 0) {
 149                 d = dsp_get_info(dev);
 150                 if (!PCM_REGISTERED(d))
 151                         return (ENXIO);
 152                 PCM_LOCK(d);
 153                 PCM_WAIT(d);
 154                 PCM_ACQUIRE(d);
 155                 /*
 156                  * Note: order is important -
 157                  *       pcm flags -> prio query flags -> wild guess
 158                  */
 159                 ch = NULL;
 160                 flags = dsp_get_flags(dev);
 161                 if (flags & SD_F_PRIO_WR) {
 162                         ch = PCM_RDCH(dev);
 163                         PCM_RDCH(dev) = NULL;
 164                 } else if (flags & SD_F_PRIO_RD) {
 165                         ch = PCM_WRCH(dev);
 166                         PCM_WRCH(dev) = NULL;
 167                 } else if (prio & SD_F_PRIO_WR) {
 168                         ch = PCM_RDCH(dev);
 169                         PCM_RDCH(dev) = NULL;
 170                         flags |= SD_F_PRIO_WR;
 171                 } else if (prio & SD_F_PRIO_RD) {
 172                         ch = PCM_WRCH(dev);
 173                         PCM_WRCH(dev) = NULL;
 174                         flags |= SD_F_PRIO_RD;
 175                 } else if (PCM_WRCH(dev) != NULL) {
 176                         ch = PCM_RDCH(dev);
 177                         PCM_RDCH(dev) = NULL;
 178                         flags |= SD_F_PRIO_WR;
 179                 } else if (PCM_RDCH(dev) != NULL) {
 180                         ch = PCM_WRCH(dev);
 181                         PCM_WRCH(dev) = NULL;
 182                         flags |= SD_F_PRIO_RD;
 183                 }
 184                 PCM_SIMPLEX(dev) = 0;
 185                 dsp_set_flags(dev, flags);
 186                 if (ch != NULL) {
 187                         CHN_LOCK(ch);
 188                         pcm_chnref(ch, -1);
 189                         pcm_chnrelease(ch);
 190                 }
 191                 PCM_RELEASE(d);
 192                 PCM_UNLOCK(d);
 193         }
 194
 195         *rdch = PCM_RDCH(dev);
 196         *wrch = PCM_WRCH(dev);
 197
 198         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 199                 CHN_LOCK(*rdch);
 200         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 201                 CHN_LOCK(*wrch);
 202
 203         return (0);
 204 }
 205
 206 /* unlock specified channels */
 207 static void
 208 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 209     uint32_t prio)
 210 {
 211         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 212                 CHN_UNLOCK(wrch);
 213         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 214                 CHN_UNLOCK(rdch);
 215 }
 216
 217 static void
 218 dsp_cdevinfo_alloc(struct cdev *dev,
 219     struct pcm_channel *rdch, struct pcm_channel *wrch,
 220     struct pcm_channel *volch)
 221 {
 222         struct snddev_info *d;
 223         struct dsp_cdevinfo *cdi;
 224         int simplex;
 225
 226         d = dsp_get_info(dev);
 227
 228         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 229             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 230             ("bogus %s(), what are you trying to accomplish here?", __func__));
 231         PCM_BUSYASSERT(d);
 232         PCM_LOCKASSERT(d);
 233
 234         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 235
 236         /*
 237          * Scan for free instance entry and put it into the end of list.
 238          * Create new one if necessary.
 239          */
 240         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 241                 if (cdi->busy != 0)
 242                         break;
 243                 cdi->rdch = rdch;
 244                 cdi->wrch = wrch;
 245                 cdi->volch = volch;
 246                 cdi->simplex = simplex;
 247                 cdi->busy = 1;
 248                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 249                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 250                 dev->si_drv1 = cdi;
 251                 return;
 252         }
 253         PCM_UNLOCK(d);
 254         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 255         PCM_LOCK(d);
 256         cdi->rdch = rdch;
 257         cdi->wrch = wrch;
 258         cdi->volch = volch;
 259         cdi->simplex = simplex;
 260         cdi->busy = 1;
 261         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 262         dev->si_drv1 = cdi;
 263 }
 264
 265 static void
 266 dsp_cdevinfo_free(struct cdev *dev)
 267 {
 268         struct snddev_info *d;
 269         struct dsp_cdevinfo *cdi, *tmp;
 270         uint32_t flags;
 271         int i;
 272
 273         d = dsp_get_info(dev);
 274
 275         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 276             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 277             PCM_VOLCH(dev) == NULL,
 278             ("bogus %s(), what are you trying to accomplish here?", __func__));
 279         PCM_BUSYASSERT(d);
 280         PCM_LOCKASSERT(d);
 281
 282         cdi = dev->si_drv1;
 283         dev->si_drv1 = NULL;
 284         cdi->rdch = NULL;
 285         cdi->wrch = NULL;
 286         cdi->volch = NULL;
 287         cdi->simplex = 0;
 288         cdi->busy = 0;
 289
 290         /*
 291          * Once it is free, move it back to the beginning of list for
 292          * faster new entry allocation.
 293          */
 294         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 295         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 296
 297         /*
 298          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 299          * Reset simplex flags.
 300          */
 301         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 302         i = DSP_CDEVINFO_CACHESIZE;
 303         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 304                 if (cdi->busy != 0) {
 305                         if (cdi->simplex == 0) {
 306                                 if (cdi->rdch != NULL)
 307                                         flags |= SD_F_PRIO_RD;
 308                                 if (cdi->wrch != NULL)
 309                                         flags |= SD_F_PRIO_WR;
 310                         }
 311                 } else {
 312                         if (i == 0) {
 313                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 314                                 free(cdi, M_DEVBUF);
 315                         } else
 316                                 i--;
 317                 }
 318         }
 319         dsp_set_flags(dev, flags);
 320 }
 321
 322 void
 323 dsp_cdevinfo_init(struct snddev_info *d)
 324 {
 325         struct dsp_cdevinfo *cdi;
 326         int i;
 327
 328         KASSERT(d != NULL, ("NULL snddev_info"));
 329         PCM_BUSYASSERT(d);
 330         PCM_UNLOCKASSERT(d);
 331
 332         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 333         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 334                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 335                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 336         }
 337 }
 338
 339 void
 340 dsp_cdevinfo_flush(struct snddev_info *d)
 341 {
 342         struct dsp_cdevinfo *cdi, *tmp;
 343
 344         KASSERT(d != NULL, ("NULL snddev_info"));
 345         PCM_BUSYASSERT(d);
 346         PCM_UNLOCKASSERT(d);
 347
 348         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 349         while (cdi != NULL) {
 350                 tmp = TAILQ_NEXT(cdi, link);
 351                 free(cdi, M_DEVBUF);
 352                 cdi = tmp;
 353         }
 354         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 355 }
 356
 357 /* duplex / simplex cdev type */
 358 enum {
 359         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 360         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 361         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 362 };
 363
 364 enum {
 365         DSP_CDEV_VOLCTL_NONE,
 366         DSP_CDEV_VOLCTL_READ,
 367         DSP_CDEV_VOLCTL_WRITE
 368 };
 369
 370 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 371 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 372 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 373 #define DSP_F_READ(x)           ((x) & FREAD)
 374 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 375
 376 static const struct {
 377         int type;
 378         char *name;
 379         char *sep;
 380         char *alias;
 381         int use_sep;
 382         int hw;
 383         int max;
 384         int volctl;
 385         uint32_t fmt, spd;
 386         int query;
 387 } dsp_cdevs[] = {
 388         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 389           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 390           DSP_CDEV_TYPE_RDWR },
 391         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 392           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 393           DSP_CDEV_TYPE_RDWR },
 394         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 395           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 396           DSP_CDEV_TYPE_RDWR },
 397         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 398           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 399         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 400           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 401         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 402           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 403         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 404           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 405         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 406           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 407         /* Low priority, OSSv4 aliases. */
 408         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
 409           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 410           DSP_CDEV_TYPE_RDWR },
 411         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
 412           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 413           DSP_CDEV_TYPE_RDWR },
 414         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
 415           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 416           DSP_CDEV_TYPE_RDWR },
 417         { SND_DEV_DSP, "dsp_spdifout",   ".", "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_spdifin",   ".", "dsp", 0, 0, 0, 0,
 421           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 422           DSP_CDEV_TYPE_RDWR },
 423 };
 424
 425 #define DSP_FIXUP_ERROR()               do {                            \
 426         prio = dsp_get_flags(i_dev);                                    \
 427         if (!DSP_F_VALID(flags))                                        \
 428                 error = EINVAL;                                         \
 429         if (!DSP_F_DUPLEX(flags) &&                                     \
 430             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 431             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 432                 error = ENOTSUP;                                        \
 433         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 434             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 435             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 436                 error = EBUSY;                                          \
 437         else if (DSP_REGISTERED(d, i_dev))                              \
 438                 error = EBUSY;                                          \
 439 } while (0)
 440
 441 static int
 442 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
 443 {
 444         struct pcm_channel *rdch, *wrch;
 445         struct snddev_info *d;
 446         uint32_t fmt, spd, prio, volctl;
 447         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 448
 449         /* Kind of impossible.. */
 450         if (i_dev == NULL || td == NULL)
 451                 return (ENODEV);
 452
 453         d = dsp_get_info(i_dev);
 454         if (!PCM_REGISTERED(d))
 455                 return (EBADF);
 456
 457         PCM_GIANT_ENTER(d);
 458
 459         /* Lock snddev so nobody else can monkey with it. */
 460         PCM_LOCK(d);
 461         PCM_WAIT(d);
 462
 463         /*
 464          * Try to acquire cloned device before someone else pick it.
 465          * ENODEV means this is not a cloned droids.
 466          */
 467         error = snd_clone_acquire(i_dev);
 468         if (!(error == 0 || error == ENODEV)) {
 469                 DSP_FIXUP_ERROR();
 470                 PCM_UNLOCK(d);
 471                 PCM_GIANT_EXIT(d);
 472                 return (error);
 473         }
 474
 475         error = 0;
 476         DSP_FIXUP_ERROR();
 477
 478         if (error != 0) {
 479                 (void)snd_clone_release(i_dev);
 480                 PCM_UNLOCK(d);
 481                 PCM_GIANT_EXIT(d);
 482                 return (error);
 483         }
 484
 485         /*
 486          * That is just enough. Acquire and unlock pcm lock so
 487          * the other will just have to wait until we finish doing
 488          * everything.
 489          */
 490         PCM_ACQUIRE(d);
 491         PCM_UNLOCK(d);
 492
 493         devtype = PCMDEV(i_dev);
 494         wdevunit = -1;
 495         rdevunit = -1;
 496         fmt = 0;
 497         spd = 0;
 498         volctl = DSP_CDEV_VOLCTL_NONE;
 499
 500         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 501                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 502                         continue;
 503                 /*
 504                  * Volume control only valid for DSPHW devices,
 505                  * and it must be opened in opposite direction be it
 506                  * simplex or duplex. Anything else will be handled
 507                  * as usual.
 508                  */
 509                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 510                         if (dsp_cdevs[i].volctl != 0 &&
 511                             DSP_F_READ(flags)) {
 512                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 513                                 flags &= ~FREAD;
 514                                 flags |= FWRITE;
 515                         }
 516                         if (DSP_F_READ(flags)) {
 517                                 (void)snd_clone_release(i_dev);
 518                                 PCM_RELEASE_QUICK(d);
 519                                 PCM_GIANT_EXIT(d);
 520                                 return (ENOTSUP);
 521                         }
 522                         wdevunit = dev2unit(i_dev);
 523                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 524                         if (dsp_cdevs[i].volctl != 0 &&
 525                             DSP_F_WRITE(flags)) {
 526                                 volctl = DSP_CDEV_VOLCTL_READ;
 527                                 flags &= ~FWRITE;
 528                                 flags |= FREAD;
 529                         }
 530                         if (DSP_F_WRITE(flags)) {
 531                                 (void)snd_clone_release(i_dev);
 532                                 PCM_RELEASE_QUICK(d);
 533                                 PCM_GIANT_EXIT(d);
 534                                 return (ENOTSUP);
 535                         }
 536                         rdevunit = dev2unit(i_dev);
 537                 }
 538                 fmt = dsp_cdevs[i].fmt;
 539                 spd = dsp_cdevs[i].spd;
 540                 break;
 541         }
 542
 543         /* No matching devtype? */
 544         if (fmt == 0 || spd == 0)
 545                 panic("impossible devtype %d", devtype);
 546
 547         rdch = NULL;
 548         wrch = NULL;
 549         rderror = 0;
 550         wrerror = 0;
 551
 552         /*
 553          * if we get here, the open request is valid- either:
 554          *   * we were previously not open
 555          *   * we were open for play xor record and the opener wants
 556          *     the non-open direction
 557          */
 558         if (DSP_F_READ(flags)) {
 559                 /* open for read */
 560                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 561                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
 562
 563                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 564                         rderror = ENXIO;
 565
 566                 if (volctl == DSP_CDEV_VOLCTL_READ)
 567                         rderror = 0;
 568
 569                 if (rderror != 0) {
 570                         if (rdch != NULL)
 571                                 pcm_chnrelease(rdch);
 572                         if (!DSP_F_DUPLEX(flags)) {
 573                                 (void)snd_clone_release(i_dev);
 574                                 PCM_RELEASE_QUICK(d);
 575                                 PCM_GIANT_EXIT(d);
 576                                 return (rderror);
 577                         }
 578                         rdch = NULL;
 579                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 580                         if (rdch != NULL) {
 581                                 pcm_chnref(rdch, 1);
 582                                 pcm_chnrelease(rdch);
 583                         }
 584                 } else {
 585                         if (flags & O_NONBLOCK)
 586                                 rdch->flags |= CHN_F_NBIO;
 587                         if (flags & O_EXCL)
 588                                 rdch->flags |= CHN_F_EXCLUSIVE;
 589                         pcm_chnref(rdch, 1);
 590                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 591                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 592                         CHN_UNLOCK(rdch);
 593                 }
 594         }
 595
 596         if (DSP_F_WRITE(flags)) {
 597                 /* open for write */
 598                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 599                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
 600
 601                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 602                         wrerror = ENXIO;
 603
 604                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 605                         wrerror = 0;
 606
 607                 if (wrerror != 0) {
 608                         if (wrch != NULL)
 609                                 pcm_chnrelease(wrch);
 610                         if (!DSP_F_DUPLEX(flags)) {
 611                                 if (rdch != NULL) {
 612                                         /*
 613                                          * Lock, deref and release previously
 614                                          * created record channel
 615                                          */
 616                                         CHN_LOCK(rdch);
 617                                         pcm_chnref(rdch, -1);
 618                                         pcm_chnrelease(rdch);
 619                                 }
 620                                 (void)snd_clone_release(i_dev);
 621                                 PCM_RELEASE_QUICK(d);
 622                                 PCM_GIANT_EXIT(d);
 623                                 return (wrerror);
 624                         }
 625                         wrch = NULL;
 626                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 627                         if (wrch != NULL) {
 628                                 pcm_chnref(wrch, 1);
 629                                 pcm_chnrelease(wrch);
 630                         }
 631                 } else {
 632                         if (flags & O_NONBLOCK)
 633                                 wrch->flags |= CHN_F_NBIO;
 634                         if (flags & O_EXCL)
 635                                 wrch->flags |= CHN_F_EXCLUSIVE;
 636                         pcm_chnref(wrch, 1);
 637                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 638                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 639                         CHN_UNLOCK(wrch);
 640                 }
 641         }
 642
 643
 644         PCM_LOCK(d);
 645
 646         /*
 647          * We're done. Allocate channels information for this cdev.
 648          */
 649         switch (volctl) {
 650         case DSP_CDEV_VOLCTL_READ:
 651                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 652                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 653                 break;
 654         case DSP_CDEV_VOLCTL_WRITE:
 655                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 656                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 657                 break;
 658         case DSP_CDEV_VOLCTL_NONE:
 659         default:
 660                 if (wrch == NULL && rdch == NULL) {
 661                         (void)snd_clone_release(i_dev);
 662                         PCM_RELEASE(d);
 663                         PCM_UNLOCK(d);
 664                         PCM_GIANT_EXIT(d);
 665                         if (wrerror != 0)
 666                                 return (wrerror);
 667                         if (rderror != 0)
 668                                 return (rderror);
 669                         return (EINVAL);
 670                 }
 671                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 672                 if (rdch != NULL)
 673                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 674                 if (wrch != NULL)
 675                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 676                 break;
 677         }
 678
 679         /*
 680          * Increase clone refcount for its automatic garbage collector.
 681          */
 682         (void)snd_clone_ref(i_dev);
 683
 684         PCM_RELEASE(d);
 685         PCM_UNLOCK(d);
 686
 687         PCM_GIANT_LEAVE(d);
 688
 689         return (0);
 690 }
 691
 692 static int
 693 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 694 {
 695         struct pcm_channel *rdch, *wrch, *volch;
 696         struct snddev_info *d;
 697         int sg_ids, rdref, wdref;
 698
 699         d = dsp_get_info(i_dev);
 700         if (!DSP_REGISTERED(d, i_dev))
 701                 return (EBADF);
 702
 703         PCM_GIANT_ENTER(d);
 704
 705         PCM_LOCK(d);
 706         PCM_WAIT(d);
 707         PCM_ACQUIRE(d);
 708
 709         rdch = PCM_RDCH(i_dev);
 710         wrch = PCM_WRCH(i_dev);
 711         volch = PCM_VOLCH(i_dev);
 712
 713         PCM_RDCH(i_dev) = NULL;
 714         PCM_WRCH(i_dev) = NULL;
 715         PCM_VOLCH(i_dev) = NULL;
 716
 717         rdref = -1;
 718         wdref = -1;
 719
 720         if (volch != NULL) {
 721                 if (volch == rdch)
 722                         rdref--;
 723                 else if (volch == wrch)
 724                         wdref--;
 725                 else {
 726                         CHN_LOCK(volch);
 727                         pcm_chnref(volch, -1);
 728                         CHN_UNLOCK(volch);
 729                 }
 730         }
 731
 732         if (rdch != NULL)
 733                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 734         if (wrch != NULL)
 735                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 736
 737         if (rdch != NULL || wrch != NULL) {
 738                 PCM_UNLOCK(d);
 739                 if (rdch != NULL) {
 740                         /*
 741                          * The channel itself need not be locked because:
 742                          *   a)  Adding a channel to a syncgroup happens only
 743                          *       in dsp_ioctl(), which cannot run concurrently
 744                          *       to dsp_close().
 745                          *   b)  The syncmember pointer (sm) is protected by
 746                          *       the global syncgroup list lock.
 747                          *   c)  A channel can't just disappear, invalidating
 748                          *       pointers, unless it's closed/dereferenced
 749                          *       first.
 750                          */
 751                         PCM_SG_LOCK();
 752                         sg_ids = chn_syncdestroy(rdch);
 753                         PCM_SG_UNLOCK();
 754                         if (sg_ids != 0)
 755                                 free_unr(pcmsg_unrhdr, sg_ids);
 756
 757                         CHN_LOCK(rdch);
 758                         pcm_chnref(rdch, rdref);
 759                         chn_abort(rdch); /* won't sleep */
 760                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 761                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 762                         chn_reset(rdch, 0, 0);
 763                         pcm_chnrelease(rdch);
 764                 }
 765                 if (wrch != NULL) {
 766                         /*
 767                          * Please see block above.
 768                          */
 769                         PCM_SG_LOCK();
 770                         sg_ids = chn_syncdestroy(wrch);
 771                         PCM_SG_UNLOCK();
 772                         if (sg_ids != 0)
 773                                 free_unr(pcmsg_unrhdr, sg_ids);
 774
 775                         CHN_LOCK(wrch);
 776                         pcm_chnref(wrch, wdref);
 777                         chn_flush(wrch); /* may sleep */
 778                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 779                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 780                         chn_reset(wrch, 0, 0);
 781                         pcm_chnrelease(wrch);
 782                 }
 783                 PCM_LOCK(d);
 784         }
 785
 786         dsp_cdevinfo_free(i_dev);
 787         /*
 788          * Release clone busy state and unref it so the automatic
 789          * garbage collector will get the hint and do the remaining
 790          * cleanup process.
 791          */
 792         (void)snd_clone_release(i_dev);
 793
 794         /*
 795          * destroy_dev() might sleep, so release pcm lock
 796          * here and rely on pcm cv serialization.
 797          */
 798         PCM_UNLOCK(d);
 799         (void)snd_clone_unref(i_dev);
 800         PCM_LOCK(d);
 801
 802         PCM_RELEASE(d);
 803         PCM_UNLOCK(d);
 804
 805         PCM_GIANT_LEAVE(d);
 806
 807         return (0);
 808 }
 809
 810 static __inline int
 811 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 812 {
 813         struct snddev_info *d;
 814         struct pcm_channel **ch, *rdch, *wrch;
 815         int (*chn_io)(struct pcm_channel *, struct uio *);
 816         int prio, ret;
 817         pid_t runpid;
 818
 819         KASSERT(i_dev != NULL && buf != NULL &&
 820             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 821             ("%s(): io train wreck!", __func__));
 822
 823         d = dsp_get_info(i_dev);
 824         if (!DSP_REGISTERED(d, i_dev))
 825                 return (EBADF);
 826
 827         PCM_GIANT_ENTER(d);
 828
 829         switch (buf->uio_rw) {
 830         case UIO_READ:
 831                 prio = SD_F_PRIO_RD;
 832                 ch = &rdch;
 833                 chn_io = chn_read;
 834                 break;
 835         case UIO_WRITE:
 836                 prio = SD_F_PRIO_WR;
 837                 ch = &wrch;
 838                 chn_io = chn_write;
 839                 break;
 840         default:
 841                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 842                 break;
 843         }
 844
 845         rdch = NULL;
 846         wrch = NULL;
 847         runpid = buf->uio_td->td_proc->p_pid;
 848
 849         getchns(i_dev, &rdch, &wrch, prio);
 850
 851         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 852                 PCM_GIANT_EXIT(d);
 853                 return (EBADF);
 854         }
 855
 856         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 857             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 858                 relchns(i_dev, rdch, wrch, prio);
 859                 PCM_GIANT_EXIT(d);
 860                 return (EINVAL);
 861         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 862                 (*ch)->flags |= CHN_F_RUNNING;
 863                 (*ch)->pid = runpid;
 864         }
 865
 866         /*
 867          * chn_read/write must give up channel lock in order to copy bytes
 868          * from/to userland, so up the "in progress" counter to make sure
 869          * someone else doesn't come along and muss up the buffer.
 870          */
 871         ++(*ch)->inprog;
 872         ret = chn_io(*ch, buf);
 873         --(*ch)->inprog;
 874
 875         CHN_BROADCAST(&(*ch)->cv);
 876
 877         relchns(i_dev, rdch, wrch, prio);
 878
 879         PCM_GIANT_LEAVE(d);
 880
 881         return (ret);
 882 }
 883
 884 static int
 885 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
 886 {
 887         return (dsp_io_ops(i_dev, buf));
 888 }
 889
 890 static int
 891 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
 892 {
 893         return (dsp_io_ops(i_dev, buf));
 894 }
 895
 896 static int
 897 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 898 {
 899         struct snddev_info *d;
 900         struct pcm_channel *c;
 901         int unit;
 902
 903         KASSERT(dev != NULL && volch != NULL,
 904             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 905
 906         d = dsp_get_info(dev);
 907         if (!PCM_REGISTERED(d)) {
 908                 *volch = NULL;
 909                 return (EINVAL);
 910         }
 911
 912         PCM_UNLOCKASSERT(d);
 913
 914         *volch = NULL;
 915
 916         c = PCM_VOLCH(dev);
 917         if (c != NULL) {
 918                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 919                         return (-1);
 920                 *volch = c;
 921                 return (0);
 922         }
 923
 924         PCM_LOCK(d);
 925         PCM_WAIT(d);
 926         PCM_ACQUIRE(d);
 927
 928         unit = dev2unit(dev);
 929
 930         CHN_FOREACH(c, d, channels.pcm) {
 931                 CHN_LOCK(c);
 932                 if (c->unit != unit) {
 933                         CHN_UNLOCK(c);
 934                         continue;
 935                 }
 936                 *volch = c;
 937                 pcm_chnref(c, 1);
 938                 PCM_VOLCH(dev) = c;
 939                 CHN_UNLOCK(c);
 940                 PCM_RELEASE(d);
 941                 PCM_UNLOCK(d);
 942                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 943         }
 944
 945         PCM_RELEASE(d);
 946         PCM_UNLOCK(d);
 947
 948         return (EINVAL);
 949 }
 950
 951 static int
 952 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 953     caddr_t arg)
 954 {
 955         struct snddev_info *d;
 956         struct pcm_channel *rdch, *wrch;
 957         int j, devtype, ret;
 958
 959         d = dsp_get_info(dev);
 960         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 961                 return (-1);
 962
 963         PCM_UNLOCKASSERT(d);
 964
 965         j = cmd & 0xff;
 966
 967         rdch = PCM_RDCH(dev);
 968         wrch = PCM_WRCH(dev);
 969
 970         /* No specific channel, look into cache */
 971         if (volch == NULL)
 972                 volch = PCM_VOLCH(dev);
 973
 974         /* Look harder */
 975         if (volch == NULL) {
 976                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 977                         volch = rdch;
 978                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 979                         volch = wrch;
 980         }
 981
 982         devtype = PCMDEV(dev);
 983
 984         /* Look super harder */
 985         if (volch == NULL &&
 986             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 987             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 988                 ret = dsp_get_volume_channel(dev, &volch);
 989                 if (ret != 0)
 990                         return (ret);
 991                 if (volch == NULL)
 992                         return (EINVAL);
 993         }
 994
 995         /* Final validation */
 996         if (volch != NULL) {
 997                 CHN_LOCK(volch);
 998                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
 999                         CHN_UNLOCK(volch);
1000                         return (-1);
1001                 }
1002                 if (volch->direction == PCMDIR_PLAY)
1003                         wrch = volch;
1004                 else
1005                         rdch = volch;
1006         }
1007
1008         ret = EINVAL;
1009
1010         if (volch != NULL &&
1011             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1012             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1013                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1014                         int left, right, center;
1015
1016                         left = *(int *)arg & 0x7f;
1017                         right = ((*(int *)arg) >> 8) & 0x7f;
1018                         center = (left + right) >> 1;
1019                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1020                             center);
1021                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1022                         *(int *)arg = CHN_GETVOLUME(volch,
1023                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1024                         *(int *)arg |= CHN_GETVOLUME(volch,
1025                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1026                 }
1027                 ret = 0;
1028         } else if (rdch != NULL || wrch != NULL) {
1029                 switch (j) {
1030                 case SOUND_MIXER_DEVMASK:
1031                 case SOUND_MIXER_CAPS:
1032                 case SOUND_MIXER_STEREODEVS:
1033                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1034                                 *(int *)arg = 0;
1035                                 if (rdch != NULL)
1036                                         *(int *)arg |= SOUND_MASK_RECLEV;
1037                                 if (wrch != NULL)
1038                                         *(int *)arg |= SOUND_MASK_PCM;
1039                         }
1040                         ret = 0;
1041                         break;
1042                 case SOUND_MIXER_RECMASK:
1043                 case SOUND_MIXER_RECSRC:
1044                         if ((cmd & ~0xff) == MIXER_READ(0))
1045                                 *(int *)arg = 0;
1046                         ret = 0;
1047                         break;
1048                 default:
1049                         break;
1050                 }
1051         }
1052
1053         if (volch != NULL)
1054                 CHN_UNLOCK(volch);
1055
1056         return (ret);
1057 }
1058
1059 static int
1060 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1061     struct thread *td)
1062 {
1063         struct pcm_channel *chn, *rdch, *wrch;
1064         struct snddev_info *d;
1065         u_long xcmd;
1066         int *arg_i, ret, tmp;
1067
1068         d = dsp_get_info(i_dev);
1069         if (!DSP_REGISTERED(d, i_dev))
1070                 return (EBADF);
1071
1072         PCM_GIANT_ENTER(d);
1073
1074         arg_i = (int *)arg;
1075         ret = 0;
1076         xcmd = 0;
1077         chn = NULL;
1078
1079         if (IOCGROUP(cmd) == 'M') {
1080                 if (cmd == OSS_GETVERSION) {
1081                         *arg_i = SOUND_VERSION;
1082                         PCM_GIANT_EXIT(d);
1083                         return (0);
1084                 }
1085                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1086                 if (ret != -1) {
1087                         PCM_GIANT_EXIT(d);
1088                         return (ret);
1089                 }
1090
1091                 if (d->mixer_dev != NULL) {
1092                         PCM_ACQUIRE_QUICK(d);
1093                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1094                             MIXER_CMD_DIRECT);
1095                         PCM_RELEASE_QUICK(d);
1096                 } else
1097                         ret = EBADF;
1098
1099                 PCM_GIANT_EXIT(d);
1100
1101                 return (ret);
1102         }
1103
1104         /*
1105          * Certain ioctls may be made on any type of device (audio, mixer,
1106          * and MIDI).  Handle those special cases here.
1107          */
1108         if (IOCGROUP(cmd) == 'X') {
1109                 PCM_ACQUIRE_QUICK(d);
1110                 switch(cmd) {
1111                 case SNDCTL_SYSINFO:
1112                         sound_oss_sysinfo((oss_sysinfo *)arg);
1113                         break;
1114                 case SNDCTL_CARDINFO:
1115                         ret = sound_oss_card_info((oss_card_info *)arg);
1116                         break;
1117                 case SNDCTL_AUDIOINFO:
1118                 case SNDCTL_AUDIOINFO_EX:
1119                 case SNDCTL_ENGINEINFO:
1120                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1121                         break;
1122                 case SNDCTL_MIXERINFO:
1123                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1124                         break;
1125                 default:
1126                         ret = EINVAL;
1127                 }
1128                 PCM_RELEASE_QUICK(d);
1129                 PCM_GIANT_EXIT(d);
1130                 return (ret);
1131         }
1132
1133         getchns(i_dev, &rdch, &wrch, 0);
1134
1135         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1136                 wrch = NULL;
1137         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1138                 rdch = NULL;
1139
1140         if (wrch == NULL && rdch == NULL) {
1141                 PCM_GIANT_EXIT(d);
1142                 return (EINVAL);
1143         }
1144
1145         switch(cmd) {
1146 #ifdef OLDPCM_IOCTL
1147         /*
1148          * we start with the new ioctl interface.
1149          */
1150         case AIONWRITE: /* how many bytes can write ? */
1151                 if (wrch) {
1152                         CHN_LOCK(wrch);
1153 /*
1154                 if (wrch && wrch->bufhard.dl)
1155                         while (chn_wrfeed(wrch) == 0);
1156 */
1157                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1158                         CHN_UNLOCK(wrch);
1159                 } else {
1160                         *arg_i = 0;
1161                         ret = EINVAL;
1162                 }
1163                 break;
1164
1165         case AIOSSIZE:     /* set the current blocksize */
1166                 {
1167                         struct snd_size *p = (struct snd_size *)arg;
1168
1169                         p->play_size = 0;
1170                         p->rec_size = 0;
1171                         PCM_ACQUIRE_QUICK(d);
1172                         if (wrch) {
1173                                 CHN_LOCK(wrch);
1174                                 chn_setblocksize(wrch, 2, p->play_size);
1175                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1176                                 CHN_UNLOCK(wrch);
1177                         }
1178                         if (rdch) {
1179                                 CHN_LOCK(rdch);
1180                                 chn_setblocksize(rdch, 2, p->rec_size);
1181                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1182                                 CHN_UNLOCK(rdch);
1183                         }
1184                         PCM_RELEASE_QUICK(d);
1185                 }
1186                 break;
1187         case AIOGSIZE:  /* get the current blocksize */
1188                 {
1189                         struct snd_size *p = (struct snd_size *)arg;
1190
1191                         if (wrch) {
1192                                 CHN_LOCK(wrch);
1193                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1194                                 CHN_UNLOCK(wrch);
1195                         }
1196                         if (rdch) {
1197                                 CHN_LOCK(rdch);
1198                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1199                                 CHN_UNLOCK(rdch);
1200                         }
1201                 }
1202                 break;
1203
1204         case AIOSFMT:
1205         case AIOGFMT:
1206                 {
1207                         snd_chan_param *p = (snd_chan_param *)arg;
1208
1209                         if (cmd == AIOSFMT &&
1210                             ((p->play_format != 0 && p->play_rate == 0) ||
1211                             (p->rec_format != 0 && p->rec_rate == 0))) {
1212                                 ret = EINVAL;
1213                                 break;
1214                         }
1215                         PCM_ACQUIRE_QUICK(d);
1216                         if (wrch) {
1217                                 CHN_LOCK(wrch);
1218                                 if (cmd == AIOSFMT && p->play_format != 0) {
1219                                         chn_setformat(wrch,
1220                                             SND_FORMAT(p->play_format,
1221                                             AFMT_CHANNEL(wrch->format),
1222                                             AFMT_EXTCHANNEL(wrch->format)));
1223                                         chn_setspeed(wrch, p->play_rate);
1224                                 }
1225                                 p->play_rate = wrch->speed;
1226                                 p->play_format = AFMT_ENCODING(wrch->format);
1227                                 CHN_UNLOCK(wrch);
1228                         } else {
1229                                 p->play_rate = 0;
1230                                 p->play_format = 0;
1231                         }
1232                         if (rdch) {
1233                                 CHN_LOCK(rdch);
1234                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1235                                         chn_setformat(rdch,
1236                                             SND_FORMAT(p->rec_format,
1237                                             AFMT_CHANNEL(rdch->format),
1238                                             AFMT_EXTCHANNEL(rdch->format)));
1239                                         chn_setspeed(rdch, p->rec_rate);
1240                                 }
1241                                 p->rec_rate = rdch->speed;
1242                                 p->rec_format = AFMT_ENCODING(rdch->format);
1243                                 CHN_UNLOCK(rdch);
1244                         } else {
1245                                 p->rec_rate = 0;
1246                                 p->rec_format = 0;
1247                         }
1248                         PCM_RELEASE_QUICK(d);
1249                 }
1250                 break;
1251
1252         case AIOGCAP:     /* get capabilities */
1253                 {
1254                         snd_capabilities *p = (snd_capabilities *)arg;
1255                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1256                         struct cdev *pdev;
1257
1258                         PCM_LOCK(d);
1259                         if (rdch) {
1260                                 CHN_LOCK(rdch);
1261                                 rcaps = chn_getcaps(rdch);
1262                         }
1263                         if (wrch) {
1264                                 CHN_LOCK(wrch);
1265                                 pcaps = chn_getcaps(wrch);
1266                         }
1267                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1268                                           pcaps? pcaps->minspeed : 0);
1269                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1270                                           pcaps? pcaps->maxspeed : 1000000);
1271                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1272                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1273                         /* XXX bad on sb16 */
1274                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1275                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1276                         if (rdch && wrch)
1277                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1278                         pdev = d->mixer_dev;
1279                         p->mixers = 1; /* default: one mixer */
1280                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1281                         p->left = p->right = 100;
1282                         if (wrch)
1283                                 CHN_UNLOCK(wrch);
1284                         if (rdch)
1285                                 CHN_UNLOCK(rdch);
1286                         PCM_UNLOCK(d);
1287                 }
1288                 break;
1289
1290         case AIOSTOP:
1291                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1292                         CHN_LOCK(wrch);
1293                         *arg_i = chn_abort(wrch);
1294                         CHN_UNLOCK(wrch);
1295                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1296                         CHN_LOCK(rdch);
1297                         *arg_i = chn_abort(rdch);
1298                         CHN_UNLOCK(rdch);
1299                 } else {
1300                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1301                         *arg_i = 0;
1302                 }
1303                 break;
1304
1305         case AIOSYNC:
1306                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1307                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1308                 break;
1309 #endif
1310         /*
1311          * here follow the standard ioctls (filio.h etc.)
1312          */
1313         case FIONREAD: /* get # bytes to read */
1314                 if (rdch) {
1315                         CHN_LOCK(rdch);
1316 /*                      if (rdch && rdch->bufhard.dl)
1317                                 while (chn_rdfeed(rdch) == 0);
1318 */
1319                         *arg_i = sndbuf_getready(rdch->bufsoft);
1320                         CHN_UNLOCK(rdch);
1321                 } else {
1322                         *arg_i = 0;
1323                         ret = EINVAL;
1324                 }
1325                 break;
1326
1327         case FIOASYNC: /*set/clear async i/o */
1328                 DEB( printf("FIOASYNC\n") ; )
1329                 break;
1330
1331         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1332         case FIONBIO: /* set/clear non-blocking i/o */
1333                 if (rdch) {
1334                         CHN_LOCK(rdch);
1335                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1336                                 rdch->flags |= CHN_F_NBIO;
1337                         else
1338                                 rdch->flags &= ~CHN_F_NBIO;
1339                         CHN_UNLOCK(rdch);
1340                 }
1341                 if (wrch) {
1342                         CHN_LOCK(wrch);
1343                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1344                                 wrch->flags |= CHN_F_NBIO;
1345                         else
1346                                 wrch->flags &= ~CHN_F_NBIO;
1347                         CHN_UNLOCK(wrch);
1348                 }
1349                 break;
1350
1351         /*
1352          * Finally, here is the linux-compatible ioctl interface
1353          */
1354 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1355         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1356         case SNDCTL_DSP_GETBLKSIZE:
1357                 chn = wrch ? wrch : rdch;
1358                 if (chn) {
1359                         CHN_LOCK(chn);
1360                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1361                         CHN_UNLOCK(chn);
1362                 } else {
1363                         *arg_i = 0;
1364                         ret = EINVAL;
1365                 }
1366                 break;
1367
1368         case SNDCTL_DSP_SETBLKSIZE:
1369                 RANGE(*arg_i, 16, 65536);
1370                 PCM_ACQUIRE_QUICK(d);
1371                 if (wrch) {
1372                         CHN_LOCK(wrch);
1373                         chn_setblocksize(wrch, 2, *arg_i);
1374                         CHN_UNLOCK(wrch);
1375                 }
1376                 if (rdch) {
1377                         CHN_LOCK(rdch);
1378                         chn_setblocksize(rdch, 2, *arg_i);
1379                         CHN_UNLOCK(rdch);
1380                 }
1381                 PCM_RELEASE_QUICK(d);
1382                 break;
1383
1384         case SNDCTL_DSP_RESET:
1385                 DEB(printf("dsp reset\n"));
1386                 if (wrch) {
1387                         CHN_LOCK(wrch);
1388                         chn_abort(wrch);
1389                         chn_resetbuf(wrch);
1390                         CHN_UNLOCK(wrch);
1391                 }
1392                 if (rdch) {
1393                         CHN_LOCK(rdch);
1394                         chn_abort(rdch);
1395                         chn_resetbuf(rdch);
1396                         CHN_UNLOCK(rdch);
1397                 }
1398                 break;
1399
1400         case SNDCTL_DSP_SYNC:
1401                 DEB(printf("dsp sync\n"));
1402                 /* chn_sync may sleep */
1403                 if (wrch) {
1404                         CHN_LOCK(wrch);
1405                         chn_sync(wrch, 0);
1406                         CHN_UNLOCK(wrch);
1407                 }
1408                 break;
1409
1410         case SNDCTL_DSP_SPEED:
1411                 /* chn_setspeed may sleep */
1412                 tmp = 0;
1413                 PCM_ACQUIRE_QUICK(d);
1414                 if (wrch) {
1415                         CHN_LOCK(wrch);
1416                         ret = chn_setspeed(wrch, *arg_i);
1417                         tmp = wrch->speed;
1418                         CHN_UNLOCK(wrch);
1419                 }
1420                 if (rdch && ret == 0) {
1421                         CHN_LOCK(rdch);
1422                         ret = chn_setspeed(rdch, *arg_i);
1423                         if (tmp == 0)
1424                                 tmp = rdch->speed;
1425                         CHN_UNLOCK(rdch);
1426                 }
1427                 PCM_RELEASE_QUICK(d);
1428                 *arg_i = tmp;
1429                 break;
1430
1431         case SOUND_PCM_READ_RATE:
1432                 chn = wrch ? wrch : rdch;
1433                 if (chn) {
1434                         CHN_LOCK(chn);
1435                         *arg_i = chn->speed;
1436                         CHN_UNLOCK(chn);
1437                 } else {
1438                         *arg_i = 0;
1439                         ret = EINVAL;
1440                 }
1441                 break;
1442
1443         case SNDCTL_DSP_STEREO:
1444                 tmp = -1;
1445                 *arg_i = (*arg_i)? 2 : 1;
1446                 PCM_ACQUIRE_QUICK(d);
1447                 if (wrch) {
1448                         CHN_LOCK(wrch);
1449                         ret = chn_setformat(wrch,
1450                             SND_FORMAT(wrch->format, *arg_i, 0));
1451                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1452                         CHN_UNLOCK(wrch);
1453                 }
1454                 if (rdch && ret == 0) {
1455                         CHN_LOCK(rdch);
1456                         ret = chn_setformat(rdch,
1457                             SND_FORMAT(rdch->format, *arg_i, 0));
1458                         if (tmp == -1)
1459                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1460                         CHN_UNLOCK(rdch);
1461                 }
1462                 PCM_RELEASE_QUICK(d);
1463                 *arg_i = tmp;
1464                 break;
1465
1466         case SOUND_PCM_WRITE_CHANNELS:
1467 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1468                 if (*arg_i < 0) {
1469                         *arg_i = 0;
1470                         ret = EINVAL;
1471                         break;
1472                 }
1473                 if (*arg_i != 0) {
1474                         struct pcmchan_matrix *m;
1475                         uint32_t ext;
1476
1477                         tmp = 0;
1478                         if (*arg_i > SND_CHN_MAX)
1479                                 *arg_i = SND_CHN_MAX;
1480
1481                         m = feeder_matrix_default_channel_map(*arg_i);
1482                         if (m != NULL)
1483                                 ext = m->ext;
1484                         else
1485                                 ext = 0;
1486
1487                         PCM_ACQUIRE_QUICK(d);
1488                         if (wrch) {
1489                                 CHN_LOCK(wrch);
1490                                 ret = chn_setformat(wrch,
1491                                     SND_FORMAT(wrch->format, *arg_i, ext));
1492                                 tmp = AFMT_CHANNEL(wrch->format);
1493                                 CHN_UNLOCK(wrch);
1494                         }
1495                         if (rdch && ret == 0) {
1496                                 CHN_LOCK(rdch);
1497                                 ret = chn_setformat(rdch,
1498                                     SND_FORMAT(rdch->format, *arg_i, ext));
1499                                 if (tmp == 0)
1500                                         tmp = AFMT_CHANNEL(rdch->format);
1501                                 CHN_UNLOCK(rdch);
1502                         }
1503                         PCM_RELEASE_QUICK(d);
1504                         *arg_i = tmp;
1505                 } else {
1506                         chn = wrch ? wrch : rdch;
1507                         CHN_LOCK(chn);
1508                         *arg_i = AFMT_CHANNEL(chn->format);
1509                         CHN_UNLOCK(chn);
1510                 }
1511                 break;
1512
1513         case SOUND_PCM_READ_CHANNELS:
1514                 chn = wrch ? wrch : rdch;
1515                 if (chn) {
1516                         CHN_LOCK(chn);
1517                         *arg_i = AFMT_CHANNEL(chn->format);
1518                         CHN_UNLOCK(chn);
1519                 } else {
1520                         *arg_i = 0;
1521                         ret = EINVAL;
1522                 }
1523                 break;
1524
1525         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1526                 chn = wrch ? wrch : rdch;
1527                 if (chn) {
1528                         CHN_LOCK(chn);
1529                         *arg_i = chn_getformats(chn);
1530                         CHN_UNLOCK(chn);
1531                 } else {
1532                         *arg_i = 0;
1533                         ret = EINVAL;
1534                 }
1535                 break;
1536
1537         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1538                 if (*arg_i != AFMT_QUERY) {
1539                         tmp = 0;
1540                         PCM_ACQUIRE_QUICK(d);
1541                         if (wrch) {
1542                                 CHN_LOCK(wrch);
1543                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1544                                     AFMT_CHANNEL(wrch->format),
1545                                     AFMT_EXTCHANNEL(wrch->format)));
1546                                 tmp = wrch->format;
1547                                 CHN_UNLOCK(wrch);
1548                         }
1549                         if (rdch && ret == 0) {
1550                                 CHN_LOCK(rdch);
1551                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1552                                     AFMT_CHANNEL(rdch->format),
1553                                     AFMT_EXTCHANNEL(rdch->format)));
1554                                 if (tmp == 0)
1555                                         tmp = rdch->format;
1556                                 CHN_UNLOCK(rdch);
1557                         }
1558                         PCM_RELEASE_QUICK(d);
1559                         *arg_i = AFMT_ENCODING(tmp);
1560                 } else {
1561                         chn = wrch ? wrch : rdch;
1562                         CHN_LOCK(chn);
1563                         *arg_i = AFMT_ENCODING(chn->format);
1564                         CHN_UNLOCK(chn);
1565                 }
1566                 break;
1567
1568         case SNDCTL_DSP_SETFRAGMENT:
1569                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1570                 {
1571                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1572                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1573                         uint32_t fragsz;
1574                         uint32_t r_maxfrags, r_fragsz;
1575
1576                         RANGE(fragln, 4, 16);
1577                         fragsz = 1 << fragln;
1578
1579                         if (maxfrags == 0)
1580                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1581                         if (maxfrags < 2)
1582                                 maxfrags = 2;
1583                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1584                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1585
1586                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1587                         PCM_ACQUIRE_QUICK(d);
1588                         if (rdch) {
1589                                 CHN_LOCK(rdch);
1590                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1591                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1592                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1593                                 CHN_UNLOCK(rdch);
1594                         } else {
1595                                 r_maxfrags = maxfrags;
1596                                 r_fragsz = fragsz;
1597                         }
1598                         if (wrch && ret == 0) {
1599                                 CHN_LOCK(wrch);
1600                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1601                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1602                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1603                                 CHN_UNLOCK(wrch);
1604                         } else { /* use whatever came from the read channel */
1605                                 maxfrags = r_maxfrags;
1606                                 fragsz = r_fragsz;
1607                         }
1608                         PCM_RELEASE_QUICK(d);
1609
1610                         fragln = 0;
1611                         while (fragsz > 1) {
1612                                 fragln++;
1613                                 fragsz >>= 1;
1614                         }
1615                         *arg_i = (maxfrags << 16) | fragln;
1616                 }
1617                 break;
1618
1619         case SNDCTL_DSP_GETISPACE:
1620                 /* return the size of data available in the input queue */
1621                 {
1622                         audio_buf_info *a = (audio_buf_info *)arg;
1623                         if (rdch) {
1624                                 struct snd_dbuf *bs = rdch->bufsoft;
1625
1626                                 CHN_LOCK(rdch);
1627                                 a->bytes = sndbuf_getready(bs);
1628                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1629                                 a->fragstotal = sndbuf_getblkcnt(bs);
1630                                 a->fragsize = sndbuf_getblksz(bs);
1631                                 CHN_UNLOCK(rdch);
1632                         } else
1633                                 ret = EINVAL;
1634                 }
1635                 break;
1636
1637         case SNDCTL_DSP_GETOSPACE:
1638                 /* return space available in the output queue */
1639                 {
1640                         audio_buf_info *a = (audio_buf_info *)arg;
1641                         if (wrch) {
1642                                 struct snd_dbuf *bs = wrch->bufsoft;
1643
1644                                 CHN_LOCK(wrch);
1645                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1646                                 a->bytes = sndbuf_getfree(bs);
1647                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1648                                 a->fragstotal = sndbuf_getblkcnt(bs);
1649                                 a->fragsize = sndbuf_getblksz(bs);
1650                                 CHN_UNLOCK(wrch);
1651                         } else
1652                                 ret = EINVAL;
1653                 }
1654                 break;
1655
1656         case SNDCTL_DSP_GETIPTR:
1657                 {
1658                         count_info *a = (count_info *)arg;
1659                         if (rdch) {
1660                                 struct snd_dbuf *bs = rdch->bufsoft;
1661
1662                                 CHN_LOCK(rdch);
1663                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1664                                 a->bytes = sndbuf_gettotal(bs);
1665                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1666                                 a->ptr = sndbuf_getfreeptr(bs);
1667                                 rdch->blocks = sndbuf_getblocks(bs);
1668                                 CHN_UNLOCK(rdch);
1669                         } else
1670                                 ret = EINVAL;
1671                 }
1672                 break;
1673
1674         case SNDCTL_DSP_GETOPTR:
1675                 {
1676                         count_info *a = (count_info *)arg;
1677                         if (wrch) {
1678                                 struct snd_dbuf *bs = wrch->bufsoft;
1679
1680                                 CHN_LOCK(wrch);
1681                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1682                                 a->bytes = sndbuf_gettotal(bs);
1683                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1684                                 a->ptr = sndbuf_getreadyptr(bs);
1685                                 wrch->blocks = sndbuf_getblocks(bs);
1686                                 CHN_UNLOCK(wrch);
1687                         } else
1688                                 ret = EINVAL;
1689                 }
1690                 break;
1691
1692         case SNDCTL_DSP_GETCAPS:
1693                 PCM_LOCK(d);
1694                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1695                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1696                         *arg_i |= PCM_CAP_DUPLEX;
1697                 PCM_UNLOCK(d);
1698                 break;
1699
1700         case SOUND_PCM_READ_BITS:
1701                 chn = wrch ? wrch : rdch;
1702                 if (chn) {
1703                         CHN_LOCK(chn);
1704                         if (chn->format & AFMT_8BIT)
1705                                 *arg_i = 8;
1706                         else if (chn->format & AFMT_16BIT)
1707                                 *arg_i = 16;
1708                         else if (chn->format & AFMT_24BIT)
1709                                 *arg_i = 24;
1710                         else if (chn->format & AFMT_32BIT)
1711                                 *arg_i = 32;
1712                         else
1713                                 ret = EINVAL;
1714                         CHN_UNLOCK(chn);
1715                 } else {
1716                         *arg_i = 0;
1717                         ret = EINVAL;
1718                 }
1719                 break;
1720
1721         case SNDCTL_DSP_SETTRIGGER:
1722                 if (rdch) {
1723                         CHN_LOCK(rdch);
1724                         rdch->flags &= ~CHN_F_NOTRIGGER;
1725                         if (*arg_i & PCM_ENABLE_INPUT)
1726                                 chn_start(rdch, 1);
1727                         else {
1728                                 chn_abort(rdch);
1729                                 chn_resetbuf(rdch);
1730                                 rdch->flags |= CHN_F_NOTRIGGER;
1731                         }
1732                         CHN_UNLOCK(rdch);
1733                 }
1734                 if (wrch) {
1735                         CHN_LOCK(wrch);
1736                         wrch->flags &= ~CHN_F_NOTRIGGER;
1737                         if (*arg_i & PCM_ENABLE_OUTPUT)
1738                                 chn_start(wrch, 1);
1739                         else {
1740                                 chn_abort(wrch);
1741                                 chn_resetbuf(wrch);
1742                                 wrch->flags |= CHN_F_NOTRIGGER;
1743                         }
1744                         CHN_UNLOCK(wrch);
1745                 }
1746                 break;
1747
1748         case SNDCTL_DSP_GETTRIGGER:
1749                 *arg_i = 0;
1750                 if (wrch) {
1751                         CHN_LOCK(wrch);
1752                         if (wrch->flags & CHN_F_TRIGGERED)
1753                                 *arg_i |= PCM_ENABLE_OUTPUT;
1754                         CHN_UNLOCK(wrch);
1755                 }
1756                 if (rdch) {
1757                         CHN_LOCK(rdch);
1758                         if (rdch->flags & CHN_F_TRIGGERED)
1759                                 *arg_i |= PCM_ENABLE_INPUT;
1760                         CHN_UNLOCK(rdch);
1761                 }
1762                 break;
1763
1764         case SNDCTL_DSP_GETODELAY:
1765                 if (wrch) {
1766                         struct snd_dbuf *bs = wrch->bufsoft;
1767
1768                         CHN_LOCK(wrch);
1769                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1770                         *arg_i = sndbuf_getready(bs);
1771                         CHN_UNLOCK(wrch);
1772                 } else
1773                         ret = EINVAL;
1774                 break;
1775
1776         case SNDCTL_DSP_POST:
1777                 if (wrch) {
1778                         CHN_LOCK(wrch);
1779                         wrch->flags &= ~CHN_F_NOTRIGGER;
1780                         chn_start(wrch, 1);
1781                         CHN_UNLOCK(wrch);
1782                 }
1783                 break;
1784
1785         case SNDCTL_DSP_SETDUPLEX:
1786                 /*
1787                  * switch to full-duplex mode if card is in half-duplex
1788                  * mode and is able to work in full-duplex mode
1789                  */
1790                 PCM_LOCK(d);
1791                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1792                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1793                 PCM_UNLOCK(d);
1794                 break;
1795
1796         /*
1797          * The following four ioctls are simple wrappers around mixer_ioctl
1798          * with no further processing.  xcmd is short for "translated
1799          * command".
1800          */
1801         case SNDCTL_DSP_GETRECVOL:
1802                 if (xcmd == 0) {
1803                         xcmd = SOUND_MIXER_READ_RECLEV;
1804                         chn = rdch;
1805                 }
1806                 /* FALLTHROUGH */
1807         case SNDCTL_DSP_SETRECVOL:
1808                 if (xcmd == 0) {
1809                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1810                         chn = rdch;
1811                 }
1812                 /* FALLTHROUGH */
1813         case SNDCTL_DSP_GETPLAYVOL:
1814                 if (xcmd == 0) {
1815                         xcmd = SOUND_MIXER_READ_PCM;
1816                         chn = wrch;
1817                 }
1818                 /* FALLTHROUGH */
1819         case SNDCTL_DSP_SETPLAYVOL:
1820                 if (xcmd == 0) {
1821                         xcmd = SOUND_MIXER_WRITE_PCM;
1822                         chn = wrch;
1823                 }
1824
1825                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1826                 if (ret != -1) {
1827                         PCM_GIANT_EXIT(d);
1828                         return (ret);
1829                 }
1830
1831                 if (d->mixer_dev != NULL) {
1832                         PCM_ACQUIRE_QUICK(d);
1833                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1834                             MIXER_CMD_DIRECT);
1835                         PCM_RELEASE_QUICK(d);
1836                 } else
1837                         ret = ENOTSUP;
1838
1839                 break;
1840
1841         case SNDCTL_DSP_GET_RECSRC_NAMES:
1842         case SNDCTL_DSP_GET_RECSRC:
1843         case SNDCTL_DSP_SET_RECSRC:
1844                 if (d->mixer_dev != NULL) {
1845                         PCM_ACQUIRE_QUICK(d);
1846                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1847                             MIXER_CMD_DIRECT);
1848                         PCM_RELEASE_QUICK(d);
1849                 } else
1850                         ret = ENOTSUP;
1851                 break;
1852
1853         /*
1854          * The following 3 ioctls aren't very useful at the moment.  For
1855          * now, only a single channel is associated with a cdev (/dev/dspN
1856          * instance), so there's only a single output routing to use (i.e.,
1857          * the wrch bound to this cdev).
1858          */
1859         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1860                 {
1861                         oss_mixer_enuminfo *ei;
1862                         ei = (oss_mixer_enuminfo *)arg;
1863                         ei->dev = 0;
1864                         ei->ctrl = 0;
1865                         ei->version = 0; /* static for now */
1866                         ei->strindex[0] = 0;
1867
1868                         if (wrch != NULL) {
1869                                 ei->nvalues = 1;
1870                                 strlcpy(ei->strings, wrch->name,
1871                                         sizeof(ei->strings));
1872                         } else {
1873                                 ei->nvalues = 0;
1874                                 ei->strings[0] = '\0';
1875                         }
1876                 }
1877                 break;
1878         case SNDCTL_DSP_GET_PLAYTGT:
1879         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1880                 /*
1881                  * Re: SET_PLAYTGT
1882                  *   OSSv4: "The value that was accepted by the device will
1883                  *   be returned back in the variable pointed by the
1884                  *   argument."
1885                  */
1886                 if (wrch != NULL)
1887                         *arg_i = 0;
1888                 else
1889                         ret = EINVAL;
1890                 break;
1891
1892         case SNDCTL_DSP_SILENCE:
1893         /*
1894          * Flush the software (pre-feed) buffer, but try to minimize playback
1895          * interruption.  (I.e., record unplayed samples with intent to
1896          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1897          * functionality.
1898          */
1899                 if (wrch == NULL)
1900                         ret = EINVAL;
1901                 else {
1902                         struct snd_dbuf *bs;
1903                         CHN_LOCK(wrch);
1904                         while (wrch->inprog != 0)
1905                                 cv_wait(&wrch->cv, wrch->lock);
1906                         bs = wrch->bufsoft;
1907                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1908                                 bs->sl = sndbuf_getready(bs);
1909                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1910                                 sndbuf_fillsilence(bs);
1911                                 chn_start(wrch, 0);
1912                         }
1913                         CHN_UNLOCK(wrch);
1914                 }
1915                 break;
1916
1917         case SNDCTL_DSP_SKIP:
1918         /*
1919          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1920          * playback buffer by moving the current write position immediately
1921          * before the point where the device is currently reading the samples."
1922          */
1923                 if (wrch == NULL)
1924                         ret = EINVAL;
1925                 else {
1926                         struct snd_dbuf *bs;
1927                         CHN_LOCK(wrch);
1928                         while (wrch->inprog != 0)
1929                                 cv_wait(&wrch->cv, wrch->lock);
1930                         bs = wrch->bufsoft;
1931                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1932                                 sndbuf_softreset(bs);
1933                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1934                                 bs->sl = 0;
1935                                 chn_start(wrch, 0);
1936                         }
1937                         CHN_UNLOCK(wrch);
1938                 }
1939                 break;
1940
1941         case SNDCTL_DSP_CURRENT_OPTR:
1942         case SNDCTL_DSP_CURRENT_IPTR:
1943         /**
1944          * @note Changing formats resets the buffer counters, which differs
1945          *       from the 4Front drivers.  However, I don't expect this to be
1946          *       much of a problem.
1947          *
1948          * @note In a test where @c CURRENT_OPTR is called immediately after write
1949          *       returns, this driver is about 32K samples behind whereas
1950          *       4Front's is about 8K samples behind.  Should determine source
1951          *       of discrepancy, even if only out of curiosity.
1952          *
1953          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1954          */
1955                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1956                 if (chn == NULL)
1957                         ret = EINVAL;
1958                 else {
1959                         struct snd_dbuf *bs;
1960                         /* int tmp; */
1961
1962                         oss_count_t *oc = (oss_count_t *)arg;
1963
1964                         CHN_LOCK(chn);
1965                         bs = chn->bufsoft;
1966 #if 0
1967                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1968                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1969                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1970 #else
1971                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1972                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1973 #endif
1974                         CHN_UNLOCK(chn);
1975                 }
1976                 break;
1977
1978         case SNDCTL_DSP_HALT_OUTPUT:
1979         case SNDCTL_DSP_HALT_INPUT:
1980                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1981                 if (chn == NULL)
1982                         ret = EINVAL;
1983                 else {
1984                         CHN_LOCK(chn);
1985                         chn_abort(chn);
1986                         CHN_UNLOCK(chn);
1987                 }
1988                 break;
1989
1990         case SNDCTL_DSP_LOW_WATER:
1991         /*
1992          * Set the number of bytes required to attract attention by
1993          * select/poll.
1994          */
1995                 if (wrch != NULL) {
1996                         CHN_LOCK(wrch);
1997                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
1998                         CHN_UNLOCK(wrch);
1999                 }
2000                 if (rdch != NULL) {
2001                         CHN_LOCK(rdch);
2002                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2003                         CHN_UNLOCK(rdch);
2004                 }
2005                 break;
2006
2007         case SNDCTL_DSP_GETERROR:
2008         /*
2009          * OSSv4 docs:  "All errors and counters will automatically be
2010          * cleared to zeroes after the call so each call will return only
2011          * the errors that occurred after the previous invocation. ... The
2012          * play_underruns and rec_overrun fields are the only usefull fields
2013          * returned by OSS 4.0."
2014          */
2015                 {
2016                         audio_errinfo *ei = (audio_errinfo *)arg;
2017
2018                         bzero((void *)ei, sizeof(*ei));
2019
2020                         if (wrch != NULL) {
2021                                 CHN_LOCK(wrch);
2022                                 ei->play_underruns = wrch->xruns;
2023                                 wrch->xruns = 0;
2024                                 CHN_UNLOCK(wrch);
2025                         }
2026                         if (rdch != NULL) {
2027                                 CHN_LOCK(rdch);
2028                                 ei->rec_overruns = rdch->xruns;
2029                                 rdch->xruns = 0;
2030                                 CHN_UNLOCK(rdch);
2031                         }
2032                 }
2033                 break;
2034
2035         case SNDCTL_DSP_SYNCGROUP:
2036                 PCM_ACQUIRE_QUICK(d);
2037                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2038                 PCM_RELEASE_QUICK(d);
2039                 break;
2040
2041         case SNDCTL_DSP_SYNCSTART:
2042                 PCM_ACQUIRE_QUICK(d);
2043                 ret = dsp_oss_syncstart(*arg_i);
2044                 PCM_RELEASE_QUICK(d);
2045                 break;
2046
2047         case SNDCTL_DSP_POLICY:
2048                 PCM_ACQUIRE_QUICK(d);
2049                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2050                 PCM_RELEASE_QUICK(d);
2051                 break;
2052
2053         case SNDCTL_DSP_COOKEDMODE:
2054                 PCM_ACQUIRE_QUICK(d);
2055                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2056                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2057                 PCM_RELEASE_QUICK(d);
2058                 break;
2059         case SNDCTL_DSP_GET_CHNORDER:
2060                 PCM_ACQUIRE_QUICK(d);
2061                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2062                 PCM_RELEASE_QUICK(d);
2063                 break;
2064         case SNDCTL_DSP_SET_CHNORDER:
2065                 PCM_ACQUIRE_QUICK(d);
2066                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2067                 PCM_RELEASE_QUICK(d);
2068                 break;
2069         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2070                 PCM_ACQUIRE_QUICK(d);
2071                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2072                 PCM_RELEASE_QUICK(d);
2073                 break;
2074         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2075                 ret = EINVAL;
2076                 break;
2077 #ifdef  OSSV4_EXPERIMENT
2078         /*
2079          * XXX The following ioctls are not yet supported and just return
2080          * EINVAL.
2081          */
2082         case SNDCTL_DSP_GETOPEAKS:
2083         case SNDCTL_DSP_GETIPEAKS:
2084                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2085                 if (chn == NULL)
2086                         ret = EINVAL;
2087                 else {
2088                         oss_peaks_t *op = (oss_peaks_t *)arg;
2089                         int lpeak, rpeak;
2090
2091                         CHN_LOCK(chn);
2092                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2093                         if (ret == -1)
2094                                 ret = EINVAL;
2095                         else {
2096                                 (*op)[0] = lpeak;
2097                                 (*op)[1] = rpeak;
2098                         }
2099                         CHN_UNLOCK(chn);
2100                 }
2101                 break;
2102
2103         /*
2104          * XXX Once implemented, revisit this for proper cv protection
2105          *     (if necessary).
2106          */
2107         case SNDCTL_GETLABEL:
2108                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2109                 break;
2110         case SNDCTL_SETLABEL:
2111                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2112                 break;
2113         case SNDCTL_GETSONG:
2114                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2115                 break;
2116         case SNDCTL_SETSONG:
2117                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2118                 break;
2119         case SNDCTL_SETNAME:
2120                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2121                 break;
2122 #if 0
2123         /**
2124          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2125          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2126          * 4Front Technologies.
2127          */
2128         case SNDCTL_DSP_READCTL:
2129         case SNDCTL_DSP_WRITECTL:
2130                 ret = EINVAL;
2131                 break;
2132 #endif  /* !0 (explicitly omitted ioctls) */
2133
2134 #endif  /* !OSSV4_EXPERIMENT */
2135         case SNDCTL_DSP_MAPINBUF:
2136         case SNDCTL_DSP_MAPOUTBUF:
2137         case SNDCTL_DSP_SETSYNCRO:
2138                 /* undocumented */
2139
2140         case SNDCTL_DSP_SUBDIVIDE:
2141         case SOUND_PCM_WRITE_FILTER:
2142         case SOUND_PCM_READ_FILTER:
2143                 /* dunno what these do, don't sound important */
2144
2145         default:
2146                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2147                 ret = EINVAL;
2148                 break;
2149         }
2150
2151         PCM_GIANT_LEAVE(d);
2152
2153         return (ret);
2154 }
2155
2156 static int
2157 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2158 {
2159         struct snddev_info *d;
2160         struct pcm_channel *wrch, *rdch;
2161         int ret, e;
2162
2163         d = dsp_get_info(i_dev);
2164         if (!DSP_REGISTERED(d, i_dev))
2165                 return (EBADF);
2166
2167         PCM_GIANT_ENTER(d);
2168
2169         wrch = NULL;
2170         rdch = NULL;
2171         ret = 0;
2172
2173         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2174
2175         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2176                 e = (events & (POLLOUT | POLLWRNORM));
2177                 if (e)
2178                         ret |= chn_poll(wrch, e, td);
2179         }
2180
2181         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2182                 e = (events & (POLLIN | POLLRDNORM));
2183                 if (e)
2184                         ret |= chn_poll(rdch, e, td);
2185         }
2186
2187         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2188
2189         PCM_GIANT_LEAVE(d);
2190
2191         return (ret);
2192 }
2193
2194 static int
2195 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
2196     int nprot, vm_memattr_t *memattr)
2197 {
2198
2199         /* XXX memattr is not honored */
2200         *paddr = vtophys(offset);
2201         return (0);
2202 }
2203
2204 static int
2205 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
2206     vm_size_t size, struct vm_object **object, int nprot)
2207 {
2208         struct snddev_info *d;
2209         struct pcm_channel *wrch, *rdch, *c;
2210
2211         /*
2212          * Reject PROT_EXEC by default. It just doesn't makes sense.
2213          * Unfortunately, we have to give up this one due to linux_mmap
2214          * changes.
2215          *
2216          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2217          *
2218          */
2219 #ifdef SV_ABI_LINUX
2220         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2221             (dsp_mmap_allow_prot_exec == 0 &&
2222             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2223 #else
2224         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2225 #endif
2226                 return (EINVAL);
2227
2228         /*
2229          * PROT_READ (alone) selects the input buffer.
2230          * PROT_WRITE (alone) selects the output buffer.
2231          * PROT_WRITE|PROT_READ together select the output buffer.
2232          */
2233         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2234                 return (EINVAL);
2235
2236         d = dsp_get_info(i_dev);
2237         if (!DSP_REGISTERED(d, i_dev))
2238                 return (EINVAL);
2239
2240         PCM_GIANT_ENTER(d);
2241
2242         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2243
2244         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2245         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2246             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2247             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2248             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2249                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2250                 PCM_GIANT_EXIT(d);
2251                 return (EINVAL);
2252         }
2253
2254         if (wrch != NULL)
2255                 wrch->flags |= CHN_F_MMAP;
2256         if (rdch != NULL)
2257                 rdch->flags |= CHN_F_MMAP;
2258
2259         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2260         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2261         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
2262             size, nprot, *offset, curthread->td_ucred);
2263
2264         PCM_GIANT_LEAVE(d);
2265
2266         if (*object == NULL)
2267                  return (EINVAL);
2268         return (0);
2269 }
2270
2271 /* So much for dev_stdclone() */
2272 static int
2273 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2274 {
2275         size_t len;
2276
2277         len = strlen(namep);
2278
2279         if (bcmp(name, namep, len) != 0)
2280                 return (ENODEV);
2281
2282         name += len;
2283
2284         if (isdigit(*name) == 0)
2285                 return (ENODEV);
2286
2287         len = strlen(sep);
2288
2289         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2290                 return (ENODEV);
2291
2292         for (*u = 0; isdigit(*name) != 0; name++) {
2293                 *u *= 10;
2294                 *u += *name - '0';
2295                 if (*u > dsp_umax)
2296                         return (ENODEV);
2297         }
2298
2299         if (*name == '\0')
2300                 return ((use_sep == 0) ? 0 : ENODEV);
2301
2302         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2303                 return (ENODEV);
2304
2305         name += len;
2306
2307         if (*name == '0' && name[1] != '\0')
2308                 return (ENODEV);
2309
2310         for (*c = 0; isdigit(*name) != 0; name++) {
2311                 *c *= 10;
2312                 *c += *name - '0';
2313                 if (*c > dsp_cmax)
2314                         return (ENODEV);
2315         }
2316
2317         if (*name != '\0')
2318                 return (ENODEV);
2319
2320         return (0);
2321 }
2322
2323 static void
2324 dsp_clone(void *arg,
2325 #if __FreeBSD_version >= 600034
2326     struct ucred *cred,
2327 #endif
2328     char *name, int namelen, struct cdev **dev)
2329 {
2330         struct snddev_info *d;
2331         struct snd_clone_entry *ce;
2332         struct pcm_channel *c;
2333         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2334         char *devname, *devcmp, *devsep;
2335
2336         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2337
2338         if (*dev != NULL)
2339                 return;
2340
2341         unit = -1;
2342         cunit = -1;
2343         devtype = -1;
2344         devhw = 0;
2345         devcmax = -1;
2346         tumax = -1;
2347         devname = NULL;
2348         devsep = NULL;
2349
2350         for (i = 0; unit == -1 &&
2351             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2352                 devtype = dsp_cdevs[i].type;
2353                 devcmp = dsp_cdevs[i].name;
2354                 devsep = dsp_cdevs[i].sep;
2355                 devname = dsp_cdevs[i].alias;
2356                 if (devname == NULL)
2357                         devname = devcmp;
2358                 devhw = dsp_cdevs[i].hw;
2359                 devcmax = dsp_cdevs[i].max - 1;
2360                 if (strcmp(name, devcmp) == 0)
2361                         unit = snd_unit;
2362                 else if (dsp_stdclone(name, devcmp, devsep,
2363                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2364                         unit = -1;
2365                         cunit = -1;
2366                 }
2367         }
2368
2369         d = devclass_get_softc(pcm_devclass, unit);
2370         if (!PCM_REGISTERED(d) || d->clones == NULL)
2371                 return;
2372
2373         /* XXX Need Giant magic entry ??? */
2374
2375         PCM_LOCK(d);
2376         if (snd_clone_disabled(d->clones)) {
2377                 PCM_UNLOCK(d);
2378                 return;
2379         }
2380
2381         PCM_WAIT(d);
2382         PCM_ACQUIRE(d);
2383         PCM_UNLOCK(d);
2384
2385         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2386
2387         if (devhw != 0) {
2388                 KASSERT(devcmax <= dsp_cmax,
2389                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2390                 if (cunit > devcmax) {
2391                         PCM_RELEASE_QUICK(d);
2392                         return;
2393                 }
2394                 udcmask |= snd_c2unit(cunit);
2395                 CHN_FOREACH(c, d, channels.pcm) {
2396                         CHN_LOCK(c);
2397                         if (c->unit != udcmask) {
2398                                 CHN_UNLOCK(c);
2399                                 continue;
2400                         }
2401                         CHN_UNLOCK(c);
2402                         udcmask &= ~snd_c2unit(cunit);
2403                         /*
2404                          * Temporarily increase clone maxunit to overcome
2405                          * vchan flexibility.
2406                          *
2407                          * # sysctl dev.pcm.0.play.vchans=256
2408                          * dev.pcm.0.play.vchans: 1 -> 256
2409                          * # cat /dev/zero > /dev/dsp0.vp255 &
2410                          * [1] 17296
2411                          * # sysctl dev.pcm.0.play.vchans=0
2412                          * dev.pcm.0.play.vchans: 256 -> 1
2413                          * # fg
2414                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2415                          * ^C
2416                          * # cat /dev/zero > /dev/dsp0.vp255
2417                          * zsh: operation not supported: /dev/dsp0.vp255
2418                          */
2419                         tumax = snd_clone_getmaxunit(d->clones);
2420                         if (cunit > tumax)
2421                                 snd_clone_setmaxunit(d->clones, cunit);
2422                         else
2423                                 tumax = -1;
2424                         goto dsp_clone_alloc;
2425                 }
2426                 /*
2427                  * Ok, so we're requesting unallocated vchan, but still
2428                  * within maximum vchan limit.
2429                  */
2430                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2431                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2432                     cunit < snd_maxautovchans) {
2433                         udcmask &= ~snd_c2unit(cunit);
2434                         tumax = snd_clone_getmaxunit(d->clones);
2435                         if (cunit > tumax)
2436                                 snd_clone_setmaxunit(d->clones, cunit);
2437                         else
2438                                 tumax = -1;
2439                         goto dsp_clone_alloc;
2440                 }
2441                 PCM_RELEASE_QUICK(d);
2442                 return;
2443         }
2444
2445 dsp_clone_alloc:
2446         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2447         if (tumax != -1)
2448                 snd_clone_setmaxunit(d->clones, tumax);
2449         if (ce != NULL) {
2450                 udcmask |= snd_c2unit(cunit);
2451                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2452                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2453                     devname, unit, devsep, cunit);
2454                 snd_clone_register(ce, *dev);
2455         }
2456
2457         PCM_RELEASE_QUICK(d);
2458
2459         if (*dev != NULL)
2460                 dev_ref(*dev);
2461 }
2462
2463 static void
2464 dsp_sysinit(void *p)
2465 {
2466         if (dsp_ehtag != NULL)
2467                 return;
2468         /* initialize unit numbering */
2469         snd_unit_init();
2470         dsp_umax = PCMMAXUNIT;
2471         dsp_cmax = PCMMAXCHAN;
2472         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2473 }
2474
2475 static void
2476 dsp_sysuninit(void *p)
2477 {
2478         if (dsp_ehtag == NULL)
2479                 return;
2480         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2481         dsp_ehtag = NULL;
2482 }
2483
2484 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2485 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2486
2487 char *
2488 dsp_unit2name(char *buf, size_t len, int unit)
2489 {
2490         int i, dtype;
2491
2492         KASSERT(buf != NULL && len != 0,
2493             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2494
2495         dtype = snd_unit2d(unit);
2496
2497         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2498                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2499                         continue;
2500                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2501                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2502                 return (buf);
2503         }
2504
2505         return (NULL);
2506 }
2507
2508 /**
2509  * @brief Handler for SNDCTL_AUDIOINFO.
2510  *
2511  * Gathers information about the audio device specified in ai->dev.  If
2512  * ai->dev == -1, then this function gathers information about the current
2513  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2514  * return EINVAL.
2515  *
2516  * This routine is supposed to go practically straight to the hardware,
2517  * getting capabilities directly from the sound card driver, side-stepping
2518  * the intermediate channel interface.
2519  *
2520  * Note, however, that the usefulness of this command is significantly
2521  * decreased when requesting info about any device other than the one serving
2522  * the request. While each snddev_channel refers to a specific device node,
2523  * the converse is *not* true.  Currently, when a sound device node is opened,
2524  * the sound subsystem scans for an available audio channel (or channels, if
2525  * opened in read+write) and then assigns them to the si_drv[12] private
2526  * data fields.  As a result, any information returned linking a channel to
2527  * a specific character device isn't necessarily accurate.
2528  *
2529  * @note
2530  * Calling threads must not hold any snddev_info or pcm_channel locks.
2531  *
2532  * @param dev           device on which the ioctl was issued
2533  * @param ai            ioctl request data container
2534  *
2535  * @retval 0            success
2536  * @retval EINVAL       ai->dev specifies an invalid device
2537  *
2538  * @todo Verify correctness of Doxygen tags.  ;)
2539  */
2540 int
2541 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2542 {
2543         struct pcmchan_caps *caps;
2544         struct pcm_channel *ch;
2545         struct snddev_info *d;
2546         uint32_t fmts;
2547         int i, nchan, *rates, minch, maxch;
2548         char *devname, buf[CHN_NAMELEN];
2549
2550         /*
2551          * If probing the device that received the ioctl, make sure it's a
2552          * DSP device.  (Users may use this ioctl with /dev/mixer and
2553          * /dev/midi.)
2554          */
2555         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2556                 return (EINVAL);
2557
2558         ch = NULL;
2559         devname = NULL;
2560         nchan = 0;
2561         bzero(buf, sizeof(buf));
2562
2563         /*
2564          * Search for the requested audio device (channel).  Start by
2565          * iterating over pcm devices.
2566          */
2567         for (i = 0; pcm_devclass != NULL &&
2568             i < devclass_get_maxunit(pcm_devclass); i++) {
2569                 d = devclass_get_softc(pcm_devclass, i);
2570                 if (!PCM_REGISTERED(d))
2571                         continue;
2572
2573                 /* XXX Need Giant magic entry ??? */
2574
2575                 /* See the note in function docblock */
2576                 PCM_UNLOCKASSERT(d);
2577                 PCM_LOCK(d);
2578
2579                 CHN_FOREACH(ch, d, channels.pcm) {
2580                         CHN_UNLOCKASSERT(ch);
2581                         CHN_LOCK(ch);
2582                         if (ai->dev == -1) {
2583                                 if (DSP_REGISTERED(d, i_dev) &&
2584                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2585                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2586                                         devname = dsp_unit2name(buf,
2587                                             sizeof(buf), ch->unit);
2588                                 }
2589                         } else if (ai->dev == nchan) {
2590                                 devname = dsp_unit2name(buf, sizeof(buf),
2591                                     ch->unit);
2592                         }
2593                         if (devname != NULL)
2594                                 break;
2595                         CHN_UNLOCK(ch);
2596                         ++nchan;
2597                 }
2598
2599                 if (devname != NULL) {
2600                         /*
2601                          * At this point, the following synchronization stuff
2602                          * has happened:
2603                          * - a specific PCM device is locked.
2604                          * - a specific audio channel has been locked, so be
2605                          *   sure to unlock when exiting;
2606                          */
2607
2608                         caps = chn_getcaps(ch);
2609
2610                         /*
2611                          * With all handles collected, zero out the user's
2612                          * container and begin filling in its fields.
2613                          */
2614                         bzero((void *)ai, sizeof(oss_audioinfo));
2615
2616                         ai->dev = nchan;
2617                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2618
2619                         if ((ch->flags & CHN_F_BUSY) == 0)
2620                                 ai->busy = 0;
2621                         else
2622                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2623
2624                         /**
2625                          * @note
2626                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2627                          *    this moment." Cop-out, I know, but I'll save
2628                          *    running around in the process table for later.
2629                          *    Is there a risk of leaking information?
2630                          */
2631                         ai->pid = ch->pid;
2632
2633                         /*
2634                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2635                          * Note, however, that a single channel operates in
2636                          * only one direction, so PCM_CAP_DUPLEX is out.
2637                          */
2638                         /**
2639                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2640                          *       these in pcmchan::caps?
2641                          */
2642                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2643                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2644
2645                         /*
2646                          * Collect formats supported @b natively by the
2647                          * device.  Also determine min/max channels.  (I.e.,
2648                          * mono, stereo, or both?)
2649                          *
2650                          * If any channel is stereo, maxch = 2;
2651                          * if all channels are stereo, minch = 2, too;
2652                          * if any channel is mono, minch = 1;
2653                          * and if all channels are mono, maxch = 1.
2654                          */
2655                         minch = 0;
2656                         maxch = 0;
2657                         fmts = 0;
2658                         for (i = 0; caps->fmtlist[i]; i++) {
2659                                 fmts |= caps->fmtlist[i];
2660                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2661                                         minch = (minch == 0) ? 2 : minch;
2662                                         maxch = 2;
2663                                 } else {
2664                                         minch = 1;
2665                                         maxch = (maxch == 0) ? 1 : maxch;
2666                                 }
2667                         }
2668
2669                         if (ch->direction == PCMDIR_PLAY)
2670                                 ai->oformats = fmts;
2671                         else
2672                                 ai->iformats = fmts;
2673
2674                         /**
2675                          * @note
2676                          * @c magic - OSSv4 docs: "Reserved for internal use
2677                          *    by OSS."
2678                          *
2679                          * @par
2680                          * @c card_number - OSSv4 docs: "Number of the sound
2681                          *    card where this device belongs or -1 if this
2682                          *    information is not available.  Applications
2683                          *    should normally not use this field for any
2684                          *    purpose."
2685                          */
2686                         ai->card_number = -1;
2687                         /**
2688                          * @todo @c song_name - depends first on
2689                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2690                          *          on SNDCTL_[GS]ETLABEL
2691                          * @todo @c port_number - routing information?
2692                          */
2693                         ai->port_number = -1;
2694                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2695                         /**
2696                          * @note
2697                          * @c real_device - OSSv4 docs:  "Obsolete."
2698                          */
2699                         ai->real_device = -1;
2700                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2701                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2702                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2703                         /**
2704                          * @note
2705                          * @c flags - OSSv4 docs: "Reserved for future use."
2706                          *
2707                          * @note
2708                          * @c binding - OSSv4 docs: "Reserved for future use."
2709                          *
2710                          * @todo @c handle - haven't decided how to generate
2711                          *       this yet; bus, vendor, device IDs?
2712                          */
2713                         ai->min_rate = caps->minspeed;
2714                         ai->max_rate = caps->maxspeed;
2715
2716                         ai->min_channels = minch;
2717                         ai->max_channels = maxch;
2718
2719                         ai->nrates = chn_getrates(ch, &rates);
2720                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2721                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2722
2723                         for (i = 0; i < ai->nrates; i++)
2724                                 ai->rates[i] = rates[i];
2725
2726                         ai->next_play_engine = 0;
2727                         ai->next_rec_engine = 0;
2728
2729                         CHN_UNLOCK(ch);
2730                 }
2731
2732                 PCM_UNLOCK(d);
2733
2734                 if (devname != NULL)
2735                         return (0);
2736         }
2737
2738         /* Exhausted the search -- nothing is locked, so return. */
2739         return (EINVAL);
2740 }
2741
2742 /**
2743  * @brief Assigns a PCM channel to a sync group.
2744  *
2745  * Sync groups are used to enable audio operations on multiple devices
2746  * simultaneously.  They may be used with any number of devices and may
2747  * span across applications.  Devices are added to groups with
2748  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2749  * SNDCTL_DSP_SYNCSTART ioctl.
2750  *
2751  * If the @c id field of the @c group parameter is set to zero, then a new
2752  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2753  * the group specified.
2754  *
2755  * @todo As far as memory allocation, should we assume that things are
2756  *       okay and allocate with M_WAITOK before acquiring channel locks,
2757  *       freeing later if not?
2758  *
2759  * @param wrch  output channel associated w/ device (if any)
2760  * @param rdch  input channel associated w/ device (if any)
2761  * @param group Sync group parameters
2762  *
2763  * @retval 0            success
2764  * @retval non-zero     error to be propagated upstream
2765  */
2766 static int
2767 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2768 {
2769         struct pcmchan_syncmember *smrd, *smwr;
2770         struct pcmchan_syncgroup *sg;
2771         int ret, sg_ids[3];
2772
2773         smrd = NULL;
2774         smwr = NULL;
2775         sg = NULL;
2776         ret = 0;
2777
2778         /*
2779          * Free_unr() may sleep, so store released syncgroup IDs until after
2780          * all locks are released.
2781          */
2782         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2783
2784         PCM_SG_LOCK();
2785
2786         /*
2787          * - Insert channel(s) into group's member list.
2788          * - Set CHN_F_NOTRIGGER on channel(s).
2789          * - Stop channel(s).
2790          */
2791
2792         /*
2793          * If device's channels are already mapped to a group, unmap them.
2794          */
2795         if (wrch) {
2796                 CHN_LOCK(wrch);
2797                 sg_ids[0] = chn_syncdestroy(wrch);
2798         }
2799
2800         if (rdch) {
2801                 CHN_LOCK(rdch);
2802                 sg_ids[1] = chn_syncdestroy(rdch);
2803         }
2804
2805         /*
2806          * Verify that mode matches character device properites.
2807          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2808          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2809          */
2810         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2811             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2812                 ret = EINVAL;
2813                 goto out;
2814         }
2815
2816         /*
2817          * An id of zero indicates the user wants to create a new
2818          * syncgroup.
2819          */
2820         if (group->id == 0) {
2821                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2822                 if (sg != NULL) {
2823                         SLIST_INIT(&sg->members);
2824                         sg->id = alloc_unr(pcmsg_unrhdr);
2825
2826                         group->id = sg->id;
2827                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2828                 } else
2829                         ret = ENOMEM;
2830         } else {
2831                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2832                         if (sg->id == group->id)
2833                                 break;
2834                 }
2835                 if (sg == NULL)
2836                         ret = EINVAL;
2837         }
2838
2839         /* Couldn't create or find a syncgroup.  Fail. */
2840         if (sg == NULL)
2841                 goto out;
2842
2843         /*
2844          * Allocate a syncmember, assign it and a channel together, and
2845          * insert into syncgroup.
2846          */
2847         if (group->mode & PCM_ENABLE_INPUT) {
2848                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2849                 if (smrd == NULL) {
2850                         ret = ENOMEM;
2851                         goto out;
2852                 }
2853
2854                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2855                 smrd->parent = sg;
2856                 smrd->ch = rdch;
2857
2858                 chn_abort(rdch);
2859                 rdch->flags |= CHN_F_NOTRIGGER;
2860                 rdch->sm = smrd;
2861         }
2862
2863         if (group->mode & PCM_ENABLE_OUTPUT) {
2864                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2865                 if (smwr == NULL) {
2866                         ret = ENOMEM;
2867                         goto out;
2868                 }
2869
2870                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2871                 smwr->parent = sg;
2872                 smwr->ch = wrch;
2873
2874                 chn_abort(wrch);
2875                 wrch->flags |= CHN_F_NOTRIGGER;
2876                 wrch->sm = smwr;
2877         }
2878
2879
2880 out:
2881         if (ret != 0) {
2882                 if (smrd != NULL)
2883                         free(smrd, M_DEVBUF);
2884                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2885                         sg_ids[2] = sg->id;
2886                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2887                         free(sg, M_DEVBUF);
2888                 }
2889
2890                 if (wrch)
2891                         wrch->sm = NULL;
2892                 if (rdch)
2893                         rdch->sm = NULL;
2894         }
2895
2896         if (wrch)
2897                 CHN_UNLOCK(wrch);
2898         if (rdch)
2899                 CHN_UNLOCK(rdch);
2900
2901         PCM_SG_UNLOCK();
2902
2903         if (sg_ids[0])
2904                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2905         if (sg_ids[1])
2906                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2907         if (sg_ids[2])
2908                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2909
2910         return (ret);
2911 }
2912
2913 /**
2914  * @brief Launch a sync group into action
2915  *
2916  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2917  * iterates over all members, triggering them along the way.
2918  *
2919  * @note Caller must not hold any channel locks.
2920  *
2921  * @param sg_id sync group identifier
2922  *
2923  * @retval 0    success
2924  * @retval non-zero     error worthy of propagating upstream to user
2925  */
2926 static int
2927 dsp_oss_syncstart(int sg_id)
2928 {
2929         struct pcmchan_syncmember *sm, *sm_tmp;
2930         struct pcmchan_syncgroup *sg;
2931         struct pcm_channel *c;
2932         int ret, needlocks;
2933
2934         /* Get the synclists lock */
2935         PCM_SG_LOCK();
2936
2937         do {
2938                 ret = 0;
2939                 needlocks = 0;
2940
2941                 /* Search for syncgroup by ID */
2942                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2943                         if (sg->id == sg_id)
2944                                 break;
2945                 }
2946
2947                 /* Return EINVAL if not found */
2948                 if (sg == NULL) {
2949                         ret = EINVAL;
2950                         break;
2951                 }
2952
2953                 /* Any removals resulting in an empty group should've handled this */
2954                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2955
2956                 /*
2957                  * Attempt to lock all member channels - if any are already
2958                  * locked, unlock those acquired, sleep for a bit, and try
2959                  * again.
2960                  */
2961                 SLIST_FOREACH(sm, &sg->members, link) {
2962                         if (CHN_TRYLOCK(sm->ch) == 0) {
2963                                 int timo = hz * 5/1000;
2964                                 if (timo < 1)
2965                                         timo = 1;
2966
2967                                 /* Release all locked channels so far, retry */
2968                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2969                                         /* sm is the member already locked */
2970                                         if (sm == sm_tmp)
2971                                                 break;
2972                                         CHN_UNLOCK(sm_tmp->ch);
2973                                 }
2974
2975                                 /** @todo Is PRIBIO correct/ */
2976                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2977                                     PRIBIO | PCATCH, "pcmsg", timo);
2978                                 if (ret == EINTR || ret == ERESTART)
2979                                         break;
2980
2981                                 needlocks = 1;
2982                                 ret = 0; /* Assumes ret == EAGAIN... */
2983                         }
2984                 }
2985         } while (needlocks && ret == 0);
2986
2987         /* Proceed only if no errors encountered. */
2988         if (ret == 0) {
2989                 /* Launch channels */
2990                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
2991                         SLIST_REMOVE_HEAD(&sg->members, link);
2992
2993                         c = sm->ch;
2994                         c->sm = NULL;
2995                         chn_start(c, 1);
2996                         c->flags &= ~CHN_F_NOTRIGGER;
2997                         CHN_UNLOCK(c);
2998
2999                         free(sm, M_DEVBUF);
3000                 }
3001
3002                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3003                 free(sg, M_DEVBUF);
3004         }
3005
3006         PCM_SG_UNLOCK();
3007
3008         /*
3009          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3010          * first.
3011          */
3012         if (ret == 0)
3013                 free_unr(pcmsg_unrhdr, sg_id);
3014
3015         return (ret);
3016 }
3017
3018 /**
3019  * @brief Handler for SNDCTL_DSP_POLICY
3020  *
3021  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3022  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3023  * specifying those two parameters, s/he simply selects a number from 0..10
3024  * which corresponds to a buffer size.  Smaller numbers request smaller
3025  * buffers with lower latencies (at greater overhead from more frequent
3026  * interrupts), while greater numbers behave in the opposite manner.
3027  *
3028  * The 4Front spec states that a value of 5 should be the default.  However,
3029  * this implementation deviates slightly by using a linear scale without
3030  * consulting drivers.  I.e., even though drivers may have different default
3031  * buffer sizes, a policy argument of 5 will have the same result across
3032  * all drivers.
3033  *
3034  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3035  * more information.
3036  *
3037  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3038  *       work with hardware drivers directly.
3039  *
3040  * @note PCM channel arguments must not be locked by caller.
3041  *
3042  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3043  * @param rdch  " recording channel (optional; may be NULL)
3044  * @param policy Integer from [0:10]
3045  *
3046  * @retval 0    constant (for now)
3047  */
3048 static int
3049 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3050 {
3051         int ret;
3052
3053         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3054                 return (EIO);
3055
3056         /* Default: success */
3057         ret = 0;
3058
3059         if (rdch) {
3060                 CHN_LOCK(rdch);
3061                 ret = chn_setlatency(rdch, policy);
3062                 CHN_UNLOCK(rdch);
3063         }
3064
3065         if (wrch && ret == 0) {
3066                 CHN_LOCK(wrch);
3067                 ret = chn_setlatency(wrch, policy);
3068                 CHN_UNLOCK(wrch);
3069         }
3070
3071         if (ret)
3072                 ret = EIO;
3073
3074         return (ret);
3075 }
3076
3077 /**
3078  * @brief Enable or disable "cooked" mode
3079  *
3080  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3081  * is the default, the sound system handles rate and format conversions
3082  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3083  * operates with 44100Hz/16bit/signed samples).
3084  *
3085  * Disabling cooked mode is intended for applications wanting to mmap()
3086  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3087  * feeder architecture, presumably to gain as much control over audio
3088  * hardware as possible.
3089  *
3090  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3091  * for more details.
3092  *
3093  * @param wrch          playback channel (optional; may be NULL)
3094  * @param rdch          recording channel (optional; may be NULL)
3095  * @param enabled       0 = raw mode, 1 = cooked mode
3096  *
3097  * @retval EINVAL       Operation not yet supported.
3098  */
3099 static int
3100 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3101 {
3102
3103         /*
3104          * XXX I just don't get it. Why don't they call it
3105          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3106          * This is just plain so confusing, incoherent,
3107          * <insert any non-printable characters here>.
3108          */
3109         if (!(enabled == 1 || enabled == 0))
3110                 return (EINVAL);
3111
3112         /*
3113          * I won't give in. I'm inverting its logic here and now.
3114          * Brag all you want, but "BITPERFECT" should be the better
3115          * term here.
3116          */
3117         enabled ^= 0x00000001;
3118
3119         if (wrch != NULL) {
3120                 CHN_LOCK(wrch);
3121                 wrch->flags &= ~CHN_F_BITPERFECT;
3122                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3123                 CHN_UNLOCK(wrch);
3124         }
3125
3126         if (rdch != NULL) {
3127                 CHN_LOCK(rdch);
3128                 rdch->flags &= ~CHN_F_BITPERFECT;
3129                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3130                 CHN_UNLOCK(rdch);
3131         }
3132
3133         return (0);
3134 }
3135
3136 /**
3137  * @brief Retrieve channel interleaving order
3138  *
3139  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3140  *
3141  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3142  * for more details.
3143  *
3144  * @note As the ioctl definition is still under construction, FreeBSD
3145  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3146  *
3147  * @param wrch  playback channel (optional; may be NULL)
3148  * @param rdch  recording channel (optional; may be NULL)
3149  * @param map   channel map (result will be stored there)
3150  *
3151  * @retval EINVAL       Operation not yet supported.
3152  */
3153 static int
3154 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3155 {
3156         struct pcm_channel *ch;
3157         int ret;
3158
3159         ch = (wrch != NULL) ? wrch : rdch;
3160         if (ch != NULL) {
3161                 CHN_LOCK(ch);
3162                 ret = chn_oss_getorder(ch, map);
3163                 CHN_UNLOCK(ch);
3164         } else
3165                 ret = EINVAL;
3166
3167         return (ret);
3168 }
3169
3170 /**
3171  * @brief Specify channel interleaving order
3172  *
3173  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3174  *
3175  * @note As the ioctl definition is still under construction, FreeBSD
3176  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3177  *
3178  * @param wrch  playback channel (optional; may be NULL)
3179  * @param rdch  recording channel (optional; may be NULL)
3180  * @param map   channel map
3181  *
3182  * @retval EINVAL       Operation not yet supported.
3183  */
3184 static int
3185 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3186 {
3187         int ret;
3188
3189         ret = 0;
3190
3191         if (wrch != NULL) {
3192                 CHN_LOCK(wrch);
3193                 ret = chn_oss_setorder(wrch, map);
3194                 CHN_UNLOCK(wrch);
3195         }
3196
3197         if (ret == 0 && rdch != NULL) {
3198                 CHN_LOCK(rdch);
3199                 ret = chn_oss_setorder(rdch, map);
3200                 CHN_UNLOCK(rdch);
3201         }
3202
3203         return (ret);
3204 }
3205
3206 static int
3207 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3208     int *mask)
3209 {
3210         struct pcm_channel *ch;
3211         uint32_t chnmask;
3212         int ret;
3213
3214         chnmask = 0;
3215         ch = (wrch != NULL) ? wrch : rdch;
3216
3217         if (ch != NULL) {
3218                 CHN_LOCK(ch);
3219                 ret = chn_oss_getmask(ch, &chnmask);
3220                 CHN_UNLOCK(ch);
3221         } else
3222                 ret = EINVAL;
3223
3224         if (ret == 0)
3225                 *mask = chnmask;
3226
3227         return (ret);
3228 }
3229
3230 #ifdef OSSV4_EXPERIMENT
3231 /**
3232  * @brief Retrieve an audio device's label
3233  *
3234  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3235  *
3236  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3237  * for more details.
3238  *
3239  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3240  * consoles) can show variable "labels" for certain controls. By default
3241  * the application name (say quake) is shown as the label but
3242  * applications may change the labels themselves."
3243  *
3244  * @note As the ioctl definition is still under construction, FreeBSD
3245  *       does not currently support @c SNDCTL_GETLABEL.
3246  *
3247  * @param wrch  playback channel (optional; may be NULL)
3248  * @param rdch  recording channel (optional; may be NULL)
3249  * @param label label gets copied here
3250  *
3251  * @retval EINVAL       Operation not yet supported.
3252  */
3253 static int
3254 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3255 {
3256         return (EINVAL);
3257 }
3258
3259 /**
3260  * @brief Specify an audio device's label
3261  *
3262  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3263  * comments for @c dsp_oss_getlabel immediately above.
3264  *
3265  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3266  * for more details.
3267  *
3268  * @note As the ioctl definition is still under construction, FreeBSD
3269  *       does not currently support SNDCTL_SETLABEL.
3270  *
3271  * @param wrch  playback channel (optional; may be NULL)
3272  * @param rdch  recording channel (optional; may be NULL)
3273  * @param label label gets copied from here
3274  *
3275  * @retval EINVAL       Operation not yet supported.
3276  */
3277 static int
3278 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3279 {
3280         return (EINVAL);
3281 }
3282
3283 /**
3284  * @brief Retrieve name of currently played song
3285  *
3286  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3287  * tell the system the name of the currently playing song, which would be
3288  * visible in @c /dev/sndstat.
3289  *
3290  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3291  * for more details.
3292  *
3293  * @note As the ioctl definition is still under construction, FreeBSD
3294  *       does not currently support SNDCTL_GETSONG.
3295  *
3296  * @param wrch  playback channel (optional; may be NULL)
3297  * @param rdch  recording channel (optional; may be NULL)
3298  * @param song  song name gets copied here
3299  *
3300  * @retval EINVAL       Operation not yet supported.
3301  */
3302 static int
3303 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3304 {
3305         return (EINVAL);
3306 }
3307
3308 /**
3309  * @brief Retrieve name of currently played song
3310  *
3311  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3312  * tell the system the name of the currently playing song, which would be
3313  * visible in @c /dev/sndstat.
3314  *
3315  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3316  * for more details.
3317  *
3318  * @note As the ioctl definition is still under construction, FreeBSD
3319  *       does not currently support SNDCTL_SETSONG.
3320  *
3321  * @param wrch  playback channel (optional; may be NULL)
3322  * @param rdch  recording channel (optional; may be NULL)
3323  * @param song  song name gets copied from here
3324  *
3325  * @retval EINVAL       Operation not yet supported.
3326  */
3327 static int
3328 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3329 {
3330         return (EINVAL);
3331 }
3332
3333 /**
3334  * @brief Rename a device
3335  *
3336  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3337  *
3338  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3339  * more details.
3340  *
3341  * From Hannu@4Front:  "This call is used to change the device name
3342  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3343  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3344  * name depending on the current context (for example 'OSS virtual wave table
3345  * synth' or 'VoIP link to London')."
3346  *
3347  * @note As the ioctl definition is still under construction, FreeBSD
3348  *       does not currently support SNDCTL_SETNAME.
3349  *
3350  * @param wrch  playback channel (optional; may be NULL)
3351  * @param rdch  recording channel (optional; may be NULL)
3352  * @param name  new device name gets copied from here
3353  *
3354  * @retval EINVAL       Operation not yet supported.
3355  */
3356 static int
3357 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3358 {
3359         return (EINVAL);
3360 }
3361 #endif  /* !OSSV4_EXPERIMENT */