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 static int dsp_basename_clone = 1;
  50 SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
  51     &dsp_basename_clone, 0,
  52     "DSP basename cloning (0: Disable; 1: Enabled)");
  53 TUNABLE_INT("hw.snd.basename_clone", &dsp_basename_clone);
  54
  55 struct dsp_cdevinfo {
  56         struct pcm_channel *rdch, *wrch;
  57         struct pcm_channel *volch;
  58         int busy, simplex;
  59         TAILQ_ENTRY(dsp_cdevinfo) link;
  60 };
  61
  62 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  63 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  64 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  65 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  66
  67 #define DSP_CDEVINFO_CACHESIZE  8
  68
  69 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  70                                  (y) != NULL && (y)->si_drv1 != NULL)
  71
  72 #define OLDPCM_IOCTL
  73
  74 static d_open_t dsp_open;
  75 static d_close_t dsp_close;
  76 static d_read_t dsp_read;
  77 static d_write_t dsp_write;
  78 static d_ioctl_t dsp_ioctl;
  79 static d_poll_t dsp_poll;
  80 static d_mmap_t dsp_mmap;
  81 static d_mmap_single_t dsp_mmap_single;
  82
  83 struct cdevsw dsp_cdevsw = {
  84         .d_version =    D_VERSION,
  85         .d_open =       dsp_open,
  86         .d_close =      dsp_close,
  87         .d_read =       dsp_read,
  88         .d_write =      dsp_write,
  89         .d_ioctl =      dsp_ioctl,
  90         .d_poll =       dsp_poll,
  91         .d_mmap =       dsp_mmap,
  92         .d_mmap_single = dsp_mmap_single,
  93         .d_name =       "dsp",
  94 };
  95
  96 static eventhandler_tag dsp_ehtag = NULL;
  97 static int dsp_umax = -1;
  98 static int dsp_cmax = -1;
  99
 100 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
 101 static int dsp_oss_syncstart(int sg_id);
 102 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
 103 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
 104 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 105 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 106 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
 107 #ifdef OSSV4_EXPERIMENT
 108 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 109 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 110 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 111 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 112 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 113 #endif
 114
 115 static struct snddev_info *
 116 dsp_get_info(struct cdev *dev)
 117 {
 118         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 119 }
 120
 121 static uint32_t
 122 dsp_get_flags(struct cdev *dev)
 123 {
 124         device_t bdev;
 125
 126         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 127
 128         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 129 }
 130
 131 static void
 132 dsp_set_flags(struct cdev *dev, uint32_t flags)
 133 {
 134         device_t bdev;
 135
 136         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 137
 138         if (bdev != NULL)
 139                 pcm_setflags(bdev, flags);
 140 }
 141
 142 /*
 143  * return the channels associated with an open device instance.
 144  * lock channels specified.
 145  */
 146 static int
 147 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 148     uint32_t prio)
 149 {
 150         struct snddev_info *d;
 151         struct pcm_channel *ch;
 152         uint32_t flags;
 153
 154         if (PCM_SIMPLEX(dev) != 0) {
 155                 d = dsp_get_info(dev);
 156                 if (!PCM_REGISTERED(d))
 157                         return (ENXIO);
 158                 PCM_LOCK(d);
 159                 PCM_WAIT(d);
 160                 PCM_ACQUIRE(d);
 161                 /*
 162                  * Note: order is important -
 163                  *       pcm flags -> prio query flags -> wild guess
 164                  */
 165                 ch = NULL;
 166                 flags = dsp_get_flags(dev);
 167                 if (flags & SD_F_PRIO_WR) {
 168                         ch = PCM_RDCH(dev);
 169                         PCM_RDCH(dev) = NULL;
 170                 } else if (flags & SD_F_PRIO_RD) {
 171                         ch = PCM_WRCH(dev);
 172                         PCM_WRCH(dev) = NULL;
 173                 } else if (prio & SD_F_PRIO_WR) {
 174                         ch = PCM_RDCH(dev);
 175                         PCM_RDCH(dev) = NULL;
 176                         flags |= SD_F_PRIO_WR;
 177                 } else if (prio & SD_F_PRIO_RD) {
 178                         ch = PCM_WRCH(dev);
 179                         PCM_WRCH(dev) = NULL;
 180                         flags |= SD_F_PRIO_RD;
 181                 } else if (PCM_WRCH(dev) != NULL) {
 182                         ch = PCM_RDCH(dev);
 183                         PCM_RDCH(dev) = NULL;
 184                         flags |= SD_F_PRIO_WR;
 185                 } else if (PCM_RDCH(dev) != NULL) {
 186                         ch = PCM_WRCH(dev);
 187                         PCM_WRCH(dev) = NULL;
 188                         flags |= SD_F_PRIO_RD;
 189                 }
 190                 PCM_SIMPLEX(dev) = 0;
 191                 dsp_set_flags(dev, flags);
 192                 if (ch != NULL) {
 193                         CHN_LOCK(ch);
 194                         pcm_chnref(ch, -1);
 195                         pcm_chnrelease(ch);
 196                 }
 197                 PCM_RELEASE(d);
 198                 PCM_UNLOCK(d);
 199         }
 200
 201         *rdch = PCM_RDCH(dev);
 202         *wrch = PCM_WRCH(dev);
 203
 204         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 205                 CHN_LOCK(*rdch);
 206         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 207                 CHN_LOCK(*wrch);
 208
 209         return (0);
 210 }
 211
 212 /* unlock specified channels */
 213 static void
 214 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 215     uint32_t prio)
 216 {
 217         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 218                 CHN_UNLOCK(wrch);
 219         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 220                 CHN_UNLOCK(rdch);
 221 }
 222
 223 static void
 224 dsp_cdevinfo_alloc(struct cdev *dev,
 225     struct pcm_channel *rdch, struct pcm_channel *wrch,
 226     struct pcm_channel *volch)
 227 {
 228         struct snddev_info *d;
 229         struct dsp_cdevinfo *cdi;
 230         int simplex;
 231
 232         d = dsp_get_info(dev);
 233
 234         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 235             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 236             ("bogus %s(), what are you trying to accomplish here?", __func__));
 237         PCM_BUSYASSERT(d);
 238         PCM_LOCKASSERT(d);
 239
 240         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 241
 242         /*
 243          * Scan for free instance entry and put it into the end of list.
 244          * Create new one if necessary.
 245          */
 246         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 247                 if (cdi->busy != 0)
 248                         break;
 249                 cdi->rdch = rdch;
 250                 cdi->wrch = wrch;
 251                 cdi->volch = volch;
 252                 cdi->simplex = simplex;
 253                 cdi->busy = 1;
 254                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 255                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 256                 dev->si_drv1 = cdi;
 257                 return;
 258         }
 259         PCM_UNLOCK(d);
 260         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 261         PCM_LOCK(d);
 262         cdi->rdch = rdch;
 263         cdi->wrch = wrch;
 264         cdi->volch = volch;
 265         cdi->simplex = simplex;
 266         cdi->busy = 1;
 267         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 268         dev->si_drv1 = cdi;
 269 }
 270
 271 static void
 272 dsp_cdevinfo_free(struct cdev *dev)
 273 {
 274         struct snddev_info *d;
 275         struct dsp_cdevinfo *cdi, *tmp;
 276         uint32_t flags;
 277         int i;
 278
 279         d = dsp_get_info(dev);
 280
 281         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 282             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 283             PCM_VOLCH(dev) == NULL,
 284             ("bogus %s(), what are you trying to accomplish here?", __func__));
 285         PCM_BUSYASSERT(d);
 286         PCM_LOCKASSERT(d);
 287
 288         cdi = dev->si_drv1;
 289         dev->si_drv1 = NULL;
 290         cdi->rdch = NULL;
 291         cdi->wrch = NULL;
 292         cdi->volch = NULL;
 293         cdi->simplex = 0;
 294         cdi->busy = 0;
 295
 296         /*
 297          * Once it is free, move it back to the beginning of list for
 298          * faster new entry allocation.
 299          */
 300         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 301         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 302
 303         /*
 304          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 305          * Reset simplex flags.
 306          */
 307         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 308         i = DSP_CDEVINFO_CACHESIZE;
 309         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 310                 if (cdi->busy != 0) {
 311                         if (cdi->simplex == 0) {
 312                                 if (cdi->rdch != NULL)
 313                                         flags |= SD_F_PRIO_RD;
 314                                 if (cdi->wrch != NULL)
 315                                         flags |= SD_F_PRIO_WR;
 316                         }
 317                 } else {
 318                         if (i == 0) {
 319                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 320                                 free(cdi, M_DEVBUF);
 321                         } else
 322                                 i--;
 323                 }
 324         }
 325         dsp_set_flags(dev, flags);
 326 }
 327
 328 void
 329 dsp_cdevinfo_init(struct snddev_info *d)
 330 {
 331         struct dsp_cdevinfo *cdi;
 332         int i;
 333
 334         KASSERT(d != NULL, ("NULL snddev_info"));
 335         PCM_BUSYASSERT(d);
 336         PCM_UNLOCKASSERT(d);
 337
 338         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 339         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 340                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 341                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 342         }
 343 }
 344
 345 void
 346 dsp_cdevinfo_flush(struct snddev_info *d)
 347 {
 348         struct dsp_cdevinfo *cdi, *tmp;
 349
 350         KASSERT(d != NULL, ("NULL snddev_info"));
 351         PCM_BUSYASSERT(d);
 352         PCM_UNLOCKASSERT(d);
 353
 354         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 355         while (cdi != NULL) {
 356                 tmp = TAILQ_NEXT(cdi, link);
 357                 free(cdi, M_DEVBUF);
 358                 cdi = tmp;
 359         }
 360         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 361 }
 362
 363 /* duplex / simplex cdev type */
 364 enum {
 365         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 366         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 367         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 368 };
 369
 370 enum {
 371         DSP_CDEV_VOLCTL_NONE,
 372         DSP_CDEV_VOLCTL_READ,
 373         DSP_CDEV_VOLCTL_WRITE
 374 };
 375
 376 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 377 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 378 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 379 #define DSP_F_READ(x)           ((x) & FREAD)
 380 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 381
 382 static const struct {
 383         int type;
 384         char *name;
 385         char *sep;
 386         char *alias;
 387         int use_sep;
 388         int hw;
 389         int max;
 390         int volctl;
 391         uint32_t fmt, spd;
 392         int query;
 393 } dsp_cdevs[] = {
 394         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 395           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 396           DSP_CDEV_TYPE_RDWR },
 397         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 398           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 399           DSP_CDEV_TYPE_RDWR },
 400         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 401           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 402           DSP_CDEV_TYPE_RDWR },
 403         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 404           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 405         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 406           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 407         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 408           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 409         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 410           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 411         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 412           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 413         /* Low priority, OSSv4 aliases. */
 414         { SND_DEV_DSP,      "dsp_ac3",   ".", "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_mmap",   ".", "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_multich",   ".", "dsp", 0, 0, 0, 0,
 421           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 422           DSP_CDEV_TYPE_RDWR },
 423         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
 424           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 425           DSP_CDEV_TYPE_RDWR },
 426         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
 427           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 428           DSP_CDEV_TYPE_RDWR },
 429 };
 430
 431 #define DSP_FIXUP_ERROR()               do {                            \
 432         prio = dsp_get_flags(i_dev);                                    \
 433         if (!DSP_F_VALID(flags))                                        \
 434                 error = EINVAL;                                         \
 435         if (!DSP_F_DUPLEX(flags) &&                                     \
 436             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 437             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 438                 error = ENOTSUP;                                        \
 439         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 440             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 441             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 442                 error = EBUSY;                                          \
 443         else if (DSP_REGISTERED(d, i_dev))                              \
 444                 error = EBUSY;                                          \
 445 } while (0)
 446
 447 static int
 448 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
 449 {
 450         struct pcm_channel *rdch, *wrch;
 451         struct snddev_info *d;
 452         uint32_t fmt, spd, prio, volctl;
 453         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 454
 455         /* Kind of impossible.. */
 456         if (i_dev == NULL || td == NULL)
 457                 return (ENODEV);
 458
 459         d = dsp_get_info(i_dev);
 460         if (PCM_DETACHING(d) || !PCM_REGISTERED(d))
 461                 return (EBADF);
 462
 463         PCM_GIANT_ENTER(d);
 464
 465         /* Lock snddev so nobody else can monkey with it. */
 466         PCM_LOCK(d);
 467         PCM_WAIT(d);
 468
 469         /*
 470          * Try to acquire cloned device before someone else pick it.
 471          * ENODEV means this is not a cloned droids.
 472          */
 473         error = snd_clone_acquire(i_dev);
 474         if (!(error == 0 || error == ENODEV)) {
 475                 DSP_FIXUP_ERROR();
 476                 PCM_UNLOCK(d);
 477                 PCM_GIANT_EXIT(d);
 478                 return (error);
 479         }
 480
 481         error = 0;
 482         DSP_FIXUP_ERROR();
 483
 484         if (error != 0) {
 485                 (void)snd_clone_release(i_dev);
 486                 PCM_UNLOCK(d);
 487                 PCM_GIANT_EXIT(d);
 488                 return (error);
 489         }
 490
 491         /*
 492          * That is just enough. Acquire and unlock pcm lock so
 493          * the other will just have to wait until we finish doing
 494          * everything.
 495          */
 496         PCM_ACQUIRE(d);
 497         PCM_UNLOCK(d);
 498
 499         devtype = PCMDEV(i_dev);
 500         wdevunit = -1;
 501         rdevunit = -1;
 502         fmt = 0;
 503         spd = 0;
 504         volctl = DSP_CDEV_VOLCTL_NONE;
 505
 506         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 507                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 508                         continue;
 509                 /*
 510                  * Volume control only valid for DSPHW devices,
 511                  * and it must be opened in opposite direction be it
 512                  * simplex or duplex. Anything else will be handled
 513                  * as usual.
 514                  */
 515                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 516                         if (dsp_cdevs[i].volctl != 0 &&
 517                             DSP_F_READ(flags)) {
 518                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 519                                 flags &= ~FREAD;
 520                                 flags |= FWRITE;
 521                         }
 522                         if (DSP_F_READ(flags)) {
 523                                 (void)snd_clone_release(i_dev);
 524                                 PCM_RELEASE_QUICK(d);
 525                                 PCM_GIANT_EXIT(d);
 526                                 return (ENOTSUP);
 527                         }
 528                         wdevunit = dev2unit(i_dev);
 529                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 530                         if (dsp_cdevs[i].volctl != 0 &&
 531                             DSP_F_WRITE(flags)) {
 532                                 volctl = DSP_CDEV_VOLCTL_READ;
 533                                 flags &= ~FWRITE;
 534                                 flags |= FREAD;
 535                         }
 536                         if (DSP_F_WRITE(flags)) {
 537                                 (void)snd_clone_release(i_dev);
 538                                 PCM_RELEASE_QUICK(d);
 539                                 PCM_GIANT_EXIT(d);
 540                                 return (ENOTSUP);
 541                         }
 542                         rdevunit = dev2unit(i_dev);
 543                 }
 544                 fmt = dsp_cdevs[i].fmt;
 545                 spd = dsp_cdevs[i].spd;
 546                 break;
 547         }
 548
 549         /* No matching devtype? */
 550         if (fmt == 0 || spd == 0)
 551                 panic("impossible devtype %d", devtype);
 552
 553         rdch = NULL;
 554         wrch = NULL;
 555         rderror = 0;
 556         wrerror = 0;
 557
 558         /*
 559          * if we get here, the open request is valid- either:
 560          *   * we were previously not open
 561          *   * we were open for play xor record and the opener wants
 562          *     the non-open direction
 563          */
 564         if (DSP_F_READ(flags)) {
 565                 /* open for read */
 566                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 567                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
 568
 569                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 570                         rderror = ENXIO;
 571
 572                 if (volctl == DSP_CDEV_VOLCTL_READ)
 573                         rderror = 0;
 574
 575                 if (rderror != 0) {
 576                         if (rdch != NULL)
 577                                 pcm_chnrelease(rdch);
 578                         if (!DSP_F_DUPLEX(flags)) {
 579                                 (void)snd_clone_release(i_dev);
 580                                 PCM_RELEASE_QUICK(d);
 581                                 PCM_GIANT_EXIT(d);
 582                                 return (rderror);
 583                         }
 584                         rdch = NULL;
 585                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 586                         if (rdch != NULL) {
 587                                 pcm_chnref(rdch, 1);
 588                                 pcm_chnrelease(rdch);
 589                         }
 590                 } else {
 591                         if (flags & O_NONBLOCK)
 592                                 rdch->flags |= CHN_F_NBIO;
 593                         if (flags & O_EXCL)
 594                                 rdch->flags |= CHN_F_EXCLUSIVE;
 595                         pcm_chnref(rdch, 1);
 596                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 597                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 598                         CHN_UNLOCK(rdch);
 599                 }
 600         }
 601
 602         if (DSP_F_WRITE(flags)) {
 603                 /* open for write */
 604                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 605                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
 606
 607                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 608                         wrerror = ENXIO;
 609
 610                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 611                         wrerror = 0;
 612
 613                 if (wrerror != 0) {
 614                         if (wrch != NULL)
 615                                 pcm_chnrelease(wrch);
 616                         if (!DSP_F_DUPLEX(flags)) {
 617                                 if (rdch != NULL) {
 618                                         /*
 619                                          * Lock, deref and release previously
 620                                          * created record channel
 621                                          */
 622                                         CHN_LOCK(rdch);
 623                                         pcm_chnref(rdch, -1);
 624                                         pcm_chnrelease(rdch);
 625                                 }
 626                                 (void)snd_clone_release(i_dev);
 627                                 PCM_RELEASE_QUICK(d);
 628                                 PCM_GIANT_EXIT(d);
 629                                 return (wrerror);
 630                         }
 631                         wrch = NULL;
 632                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 633                         if (wrch != NULL) {
 634                                 pcm_chnref(wrch, 1);
 635                                 pcm_chnrelease(wrch);
 636                         }
 637                 } else {
 638                         if (flags & O_NONBLOCK)
 639                                 wrch->flags |= CHN_F_NBIO;
 640                         if (flags & O_EXCL)
 641                                 wrch->flags |= CHN_F_EXCLUSIVE;
 642                         pcm_chnref(wrch, 1);
 643                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 644                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 645                         CHN_UNLOCK(wrch);
 646                 }
 647         }
 648
 649
 650         PCM_LOCK(d);
 651
 652         /*
 653          * We're done. Allocate channels information for this cdev.
 654          */
 655         switch (volctl) {
 656         case DSP_CDEV_VOLCTL_READ:
 657                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 658                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 659                 break;
 660         case DSP_CDEV_VOLCTL_WRITE:
 661                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 662                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 663                 break;
 664         case DSP_CDEV_VOLCTL_NONE:
 665         default:
 666                 if (wrch == NULL && rdch == NULL) {
 667                         (void)snd_clone_release(i_dev);
 668                         PCM_RELEASE(d);
 669                         PCM_UNLOCK(d);
 670                         PCM_GIANT_EXIT(d);
 671                         if (wrerror != 0)
 672                                 return (wrerror);
 673                         if (rderror != 0)
 674                                 return (rderror);
 675                         return (EINVAL);
 676                 }
 677                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 678                 if (rdch != NULL)
 679                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 680                 if (wrch != NULL)
 681                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 682                 break;
 683         }
 684
 685         /*
 686          * Increase clone refcount for its automatic garbage collector.
 687          */
 688         (void)snd_clone_ref(i_dev);
 689
 690         PCM_RELEASE(d);
 691         PCM_UNLOCK(d);
 692
 693         PCM_GIANT_LEAVE(d);
 694
 695         return (0);
 696 }
 697
 698 static int
 699 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
 700 {
 701         struct pcm_channel *rdch, *wrch, *volch;
 702         struct snddev_info *d;
 703         int sg_ids, rdref, wdref;
 704
 705         d = dsp_get_info(i_dev);
 706         if (!DSP_REGISTERED(d, i_dev))
 707                 return (EBADF);
 708
 709         PCM_GIANT_ENTER(d);
 710
 711         PCM_LOCK(d);
 712         PCM_WAIT(d);
 713         PCM_ACQUIRE(d);
 714
 715         rdch = PCM_RDCH(i_dev);
 716         wrch = PCM_WRCH(i_dev);
 717         volch = PCM_VOLCH(i_dev);
 718
 719         PCM_RDCH(i_dev) = NULL;
 720         PCM_WRCH(i_dev) = NULL;
 721         PCM_VOLCH(i_dev) = NULL;
 722
 723         rdref = -1;
 724         wdref = -1;
 725
 726         if (volch != NULL) {
 727                 if (volch == rdch)
 728                         rdref--;
 729                 else if (volch == wrch)
 730                         wdref--;
 731                 else {
 732                         CHN_LOCK(volch);
 733                         pcm_chnref(volch, -1);
 734                         CHN_UNLOCK(volch);
 735                 }
 736         }
 737
 738         if (rdch != NULL)
 739                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 740         if (wrch != NULL)
 741                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 742
 743         if (rdch != NULL || wrch != NULL) {
 744                 PCM_UNLOCK(d);
 745                 if (rdch != NULL) {
 746                         /*
 747                          * The channel itself need not be locked because:
 748                          *   a)  Adding a channel to a syncgroup happens only
 749                          *       in dsp_ioctl(), which cannot run concurrently
 750                          *       to dsp_close().
 751                          *   b)  The syncmember pointer (sm) is protected by
 752                          *       the global syncgroup list lock.
 753                          *   c)  A channel can't just disappear, invalidating
 754                          *       pointers, unless it's closed/dereferenced
 755                          *       first.
 756                          */
 757                         PCM_SG_LOCK();
 758                         sg_ids = chn_syncdestroy(rdch);
 759                         PCM_SG_UNLOCK();
 760                         if (sg_ids != 0)
 761                                 free_unr(pcmsg_unrhdr, sg_ids);
 762
 763                         CHN_LOCK(rdch);
 764                         pcm_chnref(rdch, rdref);
 765                         chn_abort(rdch); /* won't sleep */
 766                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 767                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 768                         chn_reset(rdch, 0, 0);
 769                         pcm_chnrelease(rdch);
 770                 }
 771                 if (wrch != NULL) {
 772                         /*
 773                          * Please see block above.
 774                          */
 775                         PCM_SG_LOCK();
 776                         sg_ids = chn_syncdestroy(wrch);
 777                         PCM_SG_UNLOCK();
 778                         if (sg_ids != 0)
 779                                 free_unr(pcmsg_unrhdr, sg_ids);
 780
 781                         CHN_LOCK(wrch);
 782                         pcm_chnref(wrch, wdref);
 783                         chn_flush(wrch); /* may sleep */
 784                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 785                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 786                         chn_reset(wrch, 0, 0);
 787                         pcm_chnrelease(wrch);
 788                 }
 789                 PCM_LOCK(d);
 790         }
 791
 792         dsp_cdevinfo_free(i_dev);
 793         /*
 794          * Release clone busy state and unref it so the automatic
 795          * garbage collector will get the hint and do the remaining
 796          * cleanup process.
 797          */
 798         (void)snd_clone_release(i_dev);
 799
 800         /*
 801          * destroy_dev() might sleep, so release pcm lock
 802          * here and rely on pcm cv serialization.
 803          */
 804         PCM_UNLOCK(d);
 805         (void)snd_clone_unref(i_dev);
 806         PCM_LOCK(d);
 807
 808         PCM_RELEASE(d);
 809         PCM_UNLOCK(d);
 810
 811         PCM_GIANT_LEAVE(d);
 812
 813         return (0);
 814 }
 815
 816 static __inline int
 817 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
 818 {
 819         struct snddev_info *d;
 820         struct pcm_channel **ch, *rdch, *wrch;
 821         int (*chn_io)(struct pcm_channel *, struct uio *);
 822         int prio, ret;
 823         pid_t runpid;
 824
 825         KASSERT(i_dev != NULL && buf != NULL &&
 826             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 827             ("%s(): io train wreck!", __func__));
 828
 829         d = dsp_get_info(i_dev);
 830         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 831                 return (EBADF);
 832
 833         PCM_GIANT_ENTER(d);
 834
 835         switch (buf->uio_rw) {
 836         case UIO_READ:
 837                 prio = SD_F_PRIO_RD;
 838                 ch = &rdch;
 839                 chn_io = chn_read;
 840                 break;
 841         case UIO_WRITE:
 842                 prio = SD_F_PRIO_WR;
 843                 ch = &wrch;
 844                 chn_io = chn_write;
 845                 break;
 846         default:
 847                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 848                 break;
 849         }
 850
 851         rdch = NULL;
 852         wrch = NULL;
 853         runpid = buf->uio_td->td_proc->p_pid;
 854
 855         getchns(i_dev, &rdch, &wrch, prio);
 856
 857         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 858                 PCM_GIANT_EXIT(d);
 859                 return (EBADF);
 860         }
 861
 862         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 863             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 864                 relchns(i_dev, rdch, wrch, prio);
 865                 PCM_GIANT_EXIT(d);
 866                 return (EINVAL);
 867         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 868                 (*ch)->flags |= CHN_F_RUNNING;
 869                 (*ch)->pid = runpid;
 870         }
 871
 872         /*
 873          * chn_read/write must give up channel lock in order to copy bytes
 874          * from/to userland, so up the "in progress" counter to make sure
 875          * someone else doesn't come along and muss up the buffer.
 876          */
 877         ++(*ch)->inprog;
 878         ret = chn_io(*ch, buf);
 879         --(*ch)->inprog;
 880
 881         CHN_BROADCAST(&(*ch)->cv);
 882
 883         relchns(i_dev, rdch, wrch, prio);
 884
 885         PCM_GIANT_LEAVE(d);
 886
 887         return (ret);
 888 }
 889
 890 static int
 891 dsp_read(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_write(struct cdev *i_dev, struct uio *buf, int flag)
 898 {
 899         return (dsp_io_ops(i_dev, buf));
 900 }
 901
 902 static int
 903 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 904 {
 905         struct snddev_info *d;
 906         struct pcm_channel *c;
 907         int unit;
 908
 909         KASSERT(dev != NULL && volch != NULL,
 910             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 911
 912         d = dsp_get_info(dev);
 913         if (!PCM_REGISTERED(d)) {
 914                 *volch = NULL;
 915                 return (EINVAL);
 916         }
 917
 918         PCM_UNLOCKASSERT(d);
 919
 920         *volch = NULL;
 921
 922         c = PCM_VOLCH(dev);
 923         if (c != NULL) {
 924                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 925                         return (-1);
 926                 *volch = c;
 927                 return (0);
 928         }
 929
 930         PCM_LOCK(d);
 931         PCM_WAIT(d);
 932         PCM_ACQUIRE(d);
 933
 934         unit = dev2unit(dev);
 935
 936         CHN_FOREACH(c, d, channels.pcm) {
 937                 CHN_LOCK(c);
 938                 if (c->unit != unit) {
 939                         CHN_UNLOCK(c);
 940                         continue;
 941                 }
 942                 *volch = c;
 943                 pcm_chnref(c, 1);
 944                 PCM_VOLCH(dev) = c;
 945                 CHN_UNLOCK(c);
 946                 PCM_RELEASE(d);
 947                 PCM_UNLOCK(d);
 948                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 949         }
 950
 951         PCM_RELEASE(d);
 952         PCM_UNLOCK(d);
 953
 954         return (EINVAL);
 955 }
 956
 957 static int
 958 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 959     caddr_t arg)
 960 {
 961         struct snddev_info *d;
 962         struct pcm_channel *rdch, *wrch;
 963         int j, devtype, ret;
 964
 965         d = dsp_get_info(dev);
 966         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 967                 return (-1);
 968
 969         PCM_UNLOCKASSERT(d);
 970
 971         j = cmd & 0xff;
 972
 973         rdch = PCM_RDCH(dev);
 974         wrch = PCM_WRCH(dev);
 975
 976         /* No specific channel, look into cache */
 977         if (volch == NULL)
 978                 volch = PCM_VOLCH(dev);
 979
 980         /* Look harder */
 981         if (volch == NULL) {
 982                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
 983                         volch = rdch;
 984                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
 985                         volch = wrch;
 986         }
 987
 988         devtype = PCMDEV(dev);
 989
 990         /* Look super harder */
 991         if (volch == NULL &&
 992             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
 993             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
 994                 ret = dsp_get_volume_channel(dev, &volch);
 995                 if (ret != 0)
 996                         return (ret);
 997                 if (volch == NULL)
 998                         return (EINVAL);
 999         }
1000
1001         /* Final validation */
1002         if (volch != NULL) {
1003                 CHN_LOCK(volch);
1004                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
1005                         CHN_UNLOCK(volch);
1006                         return (-1);
1007                 }
1008                 if (volch->direction == PCMDIR_PLAY)
1009                         wrch = volch;
1010                 else
1011                         rdch = volch;
1012         }
1013
1014         ret = EINVAL;
1015
1016         if (volch != NULL &&
1017             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1018             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1019                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1020                         int left, right, center;
1021
1022                         left = *(int *)arg & 0x7f;
1023                         right = ((*(int *)arg) >> 8) & 0x7f;
1024                         center = (left + right) >> 1;
1025                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1026                             center);
1027                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1028                         *(int *)arg = CHN_GETVOLUME(volch,
1029                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1030                         *(int *)arg |= CHN_GETVOLUME(volch,
1031                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1032                 }
1033                 ret = 0;
1034         } else if (rdch != NULL || wrch != NULL) {
1035                 switch (j) {
1036                 case SOUND_MIXER_DEVMASK:
1037                 case SOUND_MIXER_CAPS:
1038                 case SOUND_MIXER_STEREODEVS:
1039                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1040                                 *(int *)arg = 0;
1041                                 if (rdch != NULL)
1042                                         *(int *)arg |= SOUND_MASK_RECLEV;
1043                                 if (wrch != NULL)
1044                                         *(int *)arg |= SOUND_MASK_PCM;
1045                         }
1046                         ret = 0;
1047                         break;
1048                 case SOUND_MIXER_RECMASK:
1049                 case SOUND_MIXER_RECSRC:
1050                         if ((cmd & ~0xff) == MIXER_READ(0))
1051                                 *(int *)arg = 0;
1052                         ret = 0;
1053                         break;
1054                 default:
1055                         break;
1056                 }
1057         }
1058
1059         if (volch != NULL)
1060                 CHN_UNLOCK(volch);
1061
1062         return (ret);
1063 }
1064
1065 static int
1066 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
1067     struct thread *td)
1068 {
1069         struct pcm_channel *chn, *rdch, *wrch;
1070         struct snddev_info *d;
1071         u_long xcmd;
1072         int *arg_i, ret, tmp;
1073
1074         d = dsp_get_info(i_dev);
1075         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
1076                 return (EBADF);
1077
1078         PCM_GIANT_ENTER(d);
1079
1080         arg_i = (int *)arg;
1081         ret = 0;
1082         xcmd = 0;
1083         chn = NULL;
1084
1085         if (IOCGROUP(cmd) == 'M') {
1086                 if (cmd == OSS_GETVERSION) {
1087                         *arg_i = SOUND_VERSION;
1088                         PCM_GIANT_EXIT(d);
1089                         return (0);
1090                 }
1091                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1092                 if (ret != -1) {
1093                         PCM_GIANT_EXIT(d);
1094                         return (ret);
1095                 }
1096
1097                 if (d->mixer_dev != NULL) {
1098                         PCM_ACQUIRE_QUICK(d);
1099                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1100                             MIXER_CMD_DIRECT);
1101                         PCM_RELEASE_QUICK(d);
1102                 } else
1103                         ret = EBADF;
1104
1105                 PCM_GIANT_EXIT(d);
1106
1107                 return (ret);
1108         }
1109
1110         /*
1111          * Certain ioctls may be made on any type of device (audio, mixer,
1112          * and MIDI).  Handle those special cases here.
1113          */
1114         if (IOCGROUP(cmd) == 'X') {
1115                 PCM_ACQUIRE_QUICK(d);
1116                 switch(cmd) {
1117                 case SNDCTL_SYSINFO:
1118                         sound_oss_sysinfo((oss_sysinfo *)arg);
1119                         break;
1120                 case SNDCTL_CARDINFO:
1121                         ret = sound_oss_card_info((oss_card_info *)arg);
1122                         break;
1123                 case SNDCTL_AUDIOINFO:
1124                 case SNDCTL_AUDIOINFO_EX:
1125                 case SNDCTL_ENGINEINFO:
1126                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1127                         break;
1128                 case SNDCTL_MIXERINFO:
1129                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1130                         break;
1131                 default:
1132                         ret = EINVAL;
1133                 }
1134                 PCM_RELEASE_QUICK(d);
1135                 PCM_GIANT_EXIT(d);
1136                 return (ret);
1137         }
1138
1139         getchns(i_dev, &rdch, &wrch, 0);
1140
1141         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1142                 wrch = NULL;
1143         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1144                 rdch = NULL;
1145
1146         if (wrch == NULL && rdch == NULL) {
1147                 PCM_GIANT_EXIT(d);
1148                 return (EINVAL);
1149         }
1150
1151         switch(cmd) {
1152 #ifdef OLDPCM_IOCTL
1153         /*
1154          * we start with the new ioctl interface.
1155          */
1156         case AIONWRITE: /* how many bytes can write ? */
1157                 if (wrch) {
1158                         CHN_LOCK(wrch);
1159 /*
1160                 if (wrch && wrch->bufhard.dl)
1161                         while (chn_wrfeed(wrch) == 0);
1162 */
1163                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1164                         CHN_UNLOCK(wrch);
1165                 } else {
1166                         *arg_i = 0;
1167                         ret = EINVAL;
1168                 }
1169                 break;
1170
1171         case AIOSSIZE:     /* set the current blocksize */
1172                 {
1173                         struct snd_size *p = (struct snd_size *)arg;
1174
1175                         p->play_size = 0;
1176                         p->rec_size = 0;
1177                         PCM_ACQUIRE_QUICK(d);
1178                         if (wrch) {
1179                                 CHN_LOCK(wrch);
1180                                 chn_setblocksize(wrch, 2, p->play_size);
1181                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1182                                 CHN_UNLOCK(wrch);
1183                         }
1184                         if (rdch) {
1185                                 CHN_LOCK(rdch);
1186                                 chn_setblocksize(rdch, 2, p->rec_size);
1187                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1188                                 CHN_UNLOCK(rdch);
1189                         }
1190                         PCM_RELEASE_QUICK(d);
1191                 }
1192                 break;
1193         case AIOGSIZE:  /* get the current blocksize */
1194                 {
1195                         struct snd_size *p = (struct snd_size *)arg;
1196
1197                         if (wrch) {
1198                                 CHN_LOCK(wrch);
1199                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1200                                 CHN_UNLOCK(wrch);
1201                         }
1202                         if (rdch) {
1203                                 CHN_LOCK(rdch);
1204                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1205                                 CHN_UNLOCK(rdch);
1206                         }
1207                 }
1208                 break;
1209
1210         case AIOSFMT:
1211         case AIOGFMT:
1212                 {
1213                         snd_chan_param *p = (snd_chan_param *)arg;
1214
1215                         if (cmd == AIOSFMT &&
1216                             ((p->play_format != 0 && p->play_rate == 0) ||
1217                             (p->rec_format != 0 && p->rec_rate == 0))) {
1218                                 ret = EINVAL;
1219                                 break;
1220                         }
1221                         PCM_ACQUIRE_QUICK(d);
1222                         if (wrch) {
1223                                 CHN_LOCK(wrch);
1224                                 if (cmd == AIOSFMT && p->play_format != 0) {
1225                                         chn_setformat(wrch,
1226                                             SND_FORMAT(p->play_format,
1227                                             AFMT_CHANNEL(wrch->format),
1228                                             AFMT_EXTCHANNEL(wrch->format)));
1229                                         chn_setspeed(wrch, p->play_rate);
1230                                 }
1231                                 p->play_rate = wrch->speed;
1232                                 p->play_format = AFMT_ENCODING(wrch->format);
1233                                 CHN_UNLOCK(wrch);
1234                         } else {
1235                                 p->play_rate = 0;
1236                                 p->play_format = 0;
1237                         }
1238                         if (rdch) {
1239                                 CHN_LOCK(rdch);
1240                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1241                                         chn_setformat(rdch,
1242                                             SND_FORMAT(p->rec_format,
1243                                             AFMT_CHANNEL(rdch->format),
1244                                             AFMT_EXTCHANNEL(rdch->format)));
1245                                         chn_setspeed(rdch, p->rec_rate);
1246                                 }
1247                                 p->rec_rate = rdch->speed;
1248                                 p->rec_format = AFMT_ENCODING(rdch->format);
1249                                 CHN_UNLOCK(rdch);
1250                         } else {
1251                                 p->rec_rate = 0;
1252                                 p->rec_format = 0;
1253                         }
1254                         PCM_RELEASE_QUICK(d);
1255                 }
1256                 break;
1257
1258         case AIOGCAP:     /* get capabilities */
1259                 {
1260                         snd_capabilities *p = (snd_capabilities *)arg;
1261                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1262                         struct cdev *pdev;
1263
1264                         PCM_LOCK(d);
1265                         if (rdch) {
1266                                 CHN_LOCK(rdch);
1267                                 rcaps = chn_getcaps(rdch);
1268                         }
1269                         if (wrch) {
1270                                 CHN_LOCK(wrch);
1271                                 pcaps = chn_getcaps(wrch);
1272                         }
1273                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1274                                           pcaps? pcaps->minspeed : 0);
1275                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1276                                           pcaps? pcaps->maxspeed : 1000000);
1277                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1278                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1279                         /* XXX bad on sb16 */
1280                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1281                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1282                         if (rdch && wrch)
1283                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1284                         pdev = d->mixer_dev;
1285                         p->mixers = 1; /* default: one mixer */
1286                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1287                         p->left = p->right = 100;
1288                         if (wrch)
1289                                 CHN_UNLOCK(wrch);
1290                         if (rdch)
1291                                 CHN_UNLOCK(rdch);
1292                         PCM_UNLOCK(d);
1293                 }
1294                 break;
1295
1296         case AIOSTOP:
1297                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1298                         CHN_LOCK(wrch);
1299                         *arg_i = chn_abort(wrch);
1300                         CHN_UNLOCK(wrch);
1301                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1302                         CHN_LOCK(rdch);
1303                         *arg_i = chn_abort(rdch);
1304                         CHN_UNLOCK(rdch);
1305                 } else {
1306                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1307                         *arg_i = 0;
1308                 }
1309                 break;
1310
1311         case AIOSYNC:
1312                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1313                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1314                 break;
1315 #endif
1316         /*
1317          * here follow the standard ioctls (filio.h etc.)
1318          */
1319         case FIONREAD: /* get # bytes to read */
1320                 if (rdch) {
1321                         CHN_LOCK(rdch);
1322 /*                      if (rdch && rdch->bufhard.dl)
1323                                 while (chn_rdfeed(rdch) == 0);
1324 */
1325                         *arg_i = sndbuf_getready(rdch->bufsoft);
1326                         CHN_UNLOCK(rdch);
1327                 } else {
1328                         *arg_i = 0;
1329                         ret = EINVAL;
1330                 }
1331                 break;
1332
1333         case FIOASYNC: /*set/clear async i/o */
1334                 DEB( printf("FIOASYNC\n") ; )
1335                 break;
1336
1337         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1338         case FIONBIO: /* set/clear non-blocking i/o */
1339                 if (rdch) {
1340                         CHN_LOCK(rdch);
1341                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1342                                 rdch->flags |= CHN_F_NBIO;
1343                         else
1344                                 rdch->flags &= ~CHN_F_NBIO;
1345                         CHN_UNLOCK(rdch);
1346                 }
1347                 if (wrch) {
1348                         CHN_LOCK(wrch);
1349                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
1350                                 wrch->flags |= CHN_F_NBIO;
1351                         else
1352                                 wrch->flags &= ~CHN_F_NBIO;
1353                         CHN_UNLOCK(wrch);
1354                 }
1355                 break;
1356
1357         /*
1358          * Finally, here is the linux-compatible ioctl interface
1359          */
1360 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1361         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1362         case SNDCTL_DSP_GETBLKSIZE:
1363                 chn = wrch ? wrch : rdch;
1364                 if (chn) {
1365                         CHN_LOCK(chn);
1366                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1367                         CHN_UNLOCK(chn);
1368                 } else {
1369                         *arg_i = 0;
1370                         ret = EINVAL;
1371                 }
1372                 break;
1373
1374         case SNDCTL_DSP_SETBLKSIZE:
1375                 RANGE(*arg_i, 16, 65536);
1376                 PCM_ACQUIRE_QUICK(d);
1377                 if (wrch) {
1378                         CHN_LOCK(wrch);
1379                         chn_setblocksize(wrch, 2, *arg_i);
1380                         CHN_UNLOCK(wrch);
1381                 }
1382                 if (rdch) {
1383                         CHN_LOCK(rdch);
1384                         chn_setblocksize(rdch, 2, *arg_i);
1385                         CHN_UNLOCK(rdch);
1386                 }
1387                 PCM_RELEASE_QUICK(d);
1388                 break;
1389
1390         case SNDCTL_DSP_RESET:
1391                 DEB(printf("dsp reset\n"));
1392                 if (wrch) {
1393                         CHN_LOCK(wrch);
1394                         chn_abort(wrch);
1395                         chn_resetbuf(wrch);
1396                         CHN_UNLOCK(wrch);
1397                 }
1398                 if (rdch) {
1399                         CHN_LOCK(rdch);
1400                         chn_abort(rdch);
1401                         chn_resetbuf(rdch);
1402                         CHN_UNLOCK(rdch);
1403                 }
1404                 break;
1405
1406         case SNDCTL_DSP_SYNC:
1407                 DEB(printf("dsp sync\n"));
1408                 /* chn_sync may sleep */
1409                 if (wrch) {
1410                         CHN_LOCK(wrch);
1411                         chn_sync(wrch, 0);
1412                         CHN_UNLOCK(wrch);
1413                 }
1414                 break;
1415
1416         case SNDCTL_DSP_SPEED:
1417                 /* chn_setspeed may sleep */
1418                 tmp = 0;
1419                 PCM_ACQUIRE_QUICK(d);
1420                 if (wrch) {
1421                         CHN_LOCK(wrch);
1422                         ret = chn_setspeed(wrch, *arg_i);
1423                         tmp = wrch->speed;
1424                         CHN_UNLOCK(wrch);
1425                 }
1426                 if (rdch && ret == 0) {
1427                         CHN_LOCK(rdch);
1428                         ret = chn_setspeed(rdch, *arg_i);
1429                         if (tmp == 0)
1430                                 tmp = rdch->speed;
1431                         CHN_UNLOCK(rdch);
1432                 }
1433                 PCM_RELEASE_QUICK(d);
1434                 *arg_i = tmp;
1435                 break;
1436
1437         case SOUND_PCM_READ_RATE:
1438                 chn = wrch ? wrch : rdch;
1439                 if (chn) {
1440                         CHN_LOCK(chn);
1441                         *arg_i = chn->speed;
1442                         CHN_UNLOCK(chn);
1443                 } else {
1444                         *arg_i = 0;
1445                         ret = EINVAL;
1446                 }
1447                 break;
1448
1449         case SNDCTL_DSP_STEREO:
1450                 tmp = -1;
1451                 *arg_i = (*arg_i)? 2 : 1;
1452                 PCM_ACQUIRE_QUICK(d);
1453                 if (wrch) {
1454                         CHN_LOCK(wrch);
1455                         ret = chn_setformat(wrch,
1456                             SND_FORMAT(wrch->format, *arg_i, 0));
1457                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1458                         CHN_UNLOCK(wrch);
1459                 }
1460                 if (rdch && ret == 0) {
1461                         CHN_LOCK(rdch);
1462                         ret = chn_setformat(rdch,
1463                             SND_FORMAT(rdch->format, *arg_i, 0));
1464                         if (tmp == -1)
1465                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1466                         CHN_UNLOCK(rdch);
1467                 }
1468                 PCM_RELEASE_QUICK(d);
1469                 *arg_i = tmp;
1470                 break;
1471
1472         case SOUND_PCM_WRITE_CHANNELS:
1473 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1474                 if (*arg_i < 0) {
1475                         *arg_i = 0;
1476                         ret = EINVAL;
1477                         break;
1478                 }
1479                 if (*arg_i != 0) {
1480                         struct pcmchan_matrix *m;
1481                         uint32_t ext;
1482
1483                         tmp = 0;
1484                         if (*arg_i > SND_CHN_MAX)
1485                                 *arg_i = SND_CHN_MAX;
1486
1487                         m = feeder_matrix_default_channel_map(*arg_i);
1488                         if (m != NULL)
1489                                 ext = m->ext;
1490                         else
1491                                 ext = 0;
1492
1493                         PCM_ACQUIRE_QUICK(d);
1494                         if (wrch) {
1495                                 CHN_LOCK(wrch);
1496                                 ret = chn_setformat(wrch,
1497                                     SND_FORMAT(wrch->format, *arg_i, ext));
1498                                 tmp = AFMT_CHANNEL(wrch->format);
1499                                 CHN_UNLOCK(wrch);
1500                         }
1501                         if (rdch && ret == 0) {
1502                                 CHN_LOCK(rdch);
1503                                 ret = chn_setformat(rdch,
1504                                     SND_FORMAT(rdch->format, *arg_i, ext));
1505                                 if (tmp == 0)
1506                                         tmp = AFMT_CHANNEL(rdch->format);
1507                                 CHN_UNLOCK(rdch);
1508                         }
1509                         PCM_RELEASE_QUICK(d);
1510                         *arg_i = tmp;
1511                 } else {
1512                         chn = wrch ? wrch : rdch;
1513                         CHN_LOCK(chn);
1514                         *arg_i = AFMT_CHANNEL(chn->format);
1515                         CHN_UNLOCK(chn);
1516                 }
1517                 break;
1518
1519         case SOUND_PCM_READ_CHANNELS:
1520                 chn = wrch ? wrch : rdch;
1521                 if (chn) {
1522                         CHN_LOCK(chn);
1523                         *arg_i = AFMT_CHANNEL(chn->format);
1524                         CHN_UNLOCK(chn);
1525                 } else {
1526                         *arg_i = 0;
1527                         ret = EINVAL;
1528                 }
1529                 break;
1530
1531         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1532                 chn = wrch ? wrch : rdch;
1533                 if (chn) {
1534                         CHN_LOCK(chn);
1535                         *arg_i = chn_getformats(chn);
1536                         CHN_UNLOCK(chn);
1537                 } else {
1538                         *arg_i = 0;
1539                         ret = EINVAL;
1540                 }
1541                 break;
1542
1543         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1544                 if (*arg_i != AFMT_QUERY) {
1545                         tmp = 0;
1546                         PCM_ACQUIRE_QUICK(d);
1547                         if (wrch) {
1548                                 CHN_LOCK(wrch);
1549                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1550                                     AFMT_CHANNEL(wrch->format),
1551                                     AFMT_EXTCHANNEL(wrch->format)));
1552                                 tmp = wrch->format;
1553                                 CHN_UNLOCK(wrch);
1554                         }
1555                         if (rdch && ret == 0) {
1556                                 CHN_LOCK(rdch);
1557                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1558                                     AFMT_CHANNEL(rdch->format),
1559                                     AFMT_EXTCHANNEL(rdch->format)));
1560                                 if (tmp == 0)
1561                                         tmp = rdch->format;
1562                                 CHN_UNLOCK(rdch);
1563                         }
1564                         PCM_RELEASE_QUICK(d);
1565                         *arg_i = AFMT_ENCODING(tmp);
1566                 } else {
1567                         chn = wrch ? wrch : rdch;
1568                         CHN_LOCK(chn);
1569                         *arg_i = AFMT_ENCODING(chn->format);
1570                         CHN_UNLOCK(chn);
1571                 }
1572                 break;
1573
1574         case SNDCTL_DSP_SETFRAGMENT:
1575                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1576                 {
1577                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1578                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1579                         uint32_t fragsz;
1580                         uint32_t r_maxfrags, r_fragsz;
1581
1582                         RANGE(fragln, 4, 16);
1583                         fragsz = 1 << fragln;
1584
1585                         if (maxfrags == 0)
1586                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1587                         if (maxfrags < 2)
1588                                 maxfrags = 2;
1589                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1590                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1591
1592                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1593                         PCM_ACQUIRE_QUICK(d);
1594                         if (rdch) {
1595                                 CHN_LOCK(rdch);
1596                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1597                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1598                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1599                                 CHN_UNLOCK(rdch);
1600                         } else {
1601                                 r_maxfrags = maxfrags;
1602                                 r_fragsz = fragsz;
1603                         }
1604                         if (wrch && ret == 0) {
1605                                 CHN_LOCK(wrch);
1606                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1607                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1608                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1609                                 CHN_UNLOCK(wrch);
1610                         } else { /* use whatever came from the read channel */
1611                                 maxfrags = r_maxfrags;
1612                                 fragsz = r_fragsz;
1613                         }
1614                         PCM_RELEASE_QUICK(d);
1615
1616                         fragln = 0;
1617                         while (fragsz > 1) {
1618                                 fragln++;
1619                                 fragsz >>= 1;
1620                         }
1621                         *arg_i = (maxfrags << 16) | fragln;
1622                 }
1623                 break;
1624
1625         case SNDCTL_DSP_GETISPACE:
1626                 /* return the size of data available in the input queue */
1627                 {
1628                         audio_buf_info *a = (audio_buf_info *)arg;
1629                         if (rdch) {
1630                                 struct snd_dbuf *bs = rdch->bufsoft;
1631
1632                                 CHN_LOCK(rdch);
1633                                 a->bytes = sndbuf_getready(bs);
1634                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1635                                 a->fragstotal = sndbuf_getblkcnt(bs);
1636                                 a->fragsize = sndbuf_getblksz(bs);
1637                                 CHN_UNLOCK(rdch);
1638                         } else
1639                                 ret = EINVAL;
1640                 }
1641                 break;
1642
1643         case SNDCTL_DSP_GETOSPACE:
1644                 /* return space available in the output queue */
1645                 {
1646                         audio_buf_info *a = (audio_buf_info *)arg;
1647                         if (wrch) {
1648                                 struct snd_dbuf *bs = wrch->bufsoft;
1649
1650                                 CHN_LOCK(wrch);
1651                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1652                                 a->bytes = sndbuf_getfree(bs);
1653                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1654                                 a->fragstotal = sndbuf_getblkcnt(bs);
1655                                 a->fragsize = sndbuf_getblksz(bs);
1656                                 CHN_UNLOCK(wrch);
1657                         } else
1658                                 ret = EINVAL;
1659                 }
1660                 break;
1661
1662         case SNDCTL_DSP_GETIPTR:
1663                 {
1664                         count_info *a = (count_info *)arg;
1665                         if (rdch) {
1666                                 struct snd_dbuf *bs = rdch->bufsoft;
1667
1668                                 CHN_LOCK(rdch);
1669                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1670                                 a->bytes = sndbuf_gettotal(bs);
1671                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1672                                 a->ptr = sndbuf_getfreeptr(bs);
1673                                 rdch->blocks = sndbuf_getblocks(bs);
1674                                 CHN_UNLOCK(rdch);
1675                         } else
1676                                 ret = EINVAL;
1677                 }
1678                 break;
1679
1680         case SNDCTL_DSP_GETOPTR:
1681                 {
1682                         count_info *a = (count_info *)arg;
1683                         if (wrch) {
1684                                 struct snd_dbuf *bs = wrch->bufsoft;
1685
1686                                 CHN_LOCK(wrch);
1687                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1688                                 a->bytes = sndbuf_gettotal(bs);
1689                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1690                                 a->ptr = sndbuf_getreadyptr(bs);
1691                                 wrch->blocks = sndbuf_getblocks(bs);
1692                                 CHN_UNLOCK(wrch);
1693                         } else
1694                                 ret = EINVAL;
1695                 }
1696                 break;
1697
1698         case SNDCTL_DSP_GETCAPS:
1699                 PCM_LOCK(d);
1700                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1701                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1702                         *arg_i |= PCM_CAP_DUPLEX;
1703                 PCM_UNLOCK(d);
1704                 break;
1705
1706         case SOUND_PCM_READ_BITS:
1707                 chn = wrch ? wrch : rdch;
1708                 if (chn) {
1709                         CHN_LOCK(chn);
1710                         if (chn->format & AFMT_8BIT)
1711                                 *arg_i = 8;
1712                         else if (chn->format & AFMT_16BIT)
1713                                 *arg_i = 16;
1714                         else if (chn->format & AFMT_24BIT)
1715                                 *arg_i = 24;
1716                         else if (chn->format & AFMT_32BIT)
1717                                 *arg_i = 32;
1718                         else
1719                                 ret = EINVAL;
1720                         CHN_UNLOCK(chn);
1721                 } else {
1722                         *arg_i = 0;
1723                         ret = EINVAL;
1724                 }
1725                 break;
1726
1727         case SNDCTL_DSP_SETTRIGGER:
1728                 if (rdch) {
1729                         CHN_LOCK(rdch);
1730                         rdch->flags &= ~CHN_F_NOTRIGGER;
1731                         if (*arg_i & PCM_ENABLE_INPUT)
1732                                 chn_start(rdch, 1);
1733                         else {
1734                                 chn_abort(rdch);
1735                                 chn_resetbuf(rdch);
1736                                 rdch->flags |= CHN_F_NOTRIGGER;
1737                         }
1738                         CHN_UNLOCK(rdch);
1739                 }
1740                 if (wrch) {
1741                         CHN_LOCK(wrch);
1742                         wrch->flags &= ~CHN_F_NOTRIGGER;
1743                         if (*arg_i & PCM_ENABLE_OUTPUT)
1744                                 chn_start(wrch, 1);
1745                         else {
1746                                 chn_abort(wrch);
1747                                 chn_resetbuf(wrch);
1748                                 wrch->flags |= CHN_F_NOTRIGGER;
1749                         }
1750                         CHN_UNLOCK(wrch);
1751                 }
1752                 break;
1753
1754         case SNDCTL_DSP_GETTRIGGER:
1755                 *arg_i = 0;
1756                 if (wrch) {
1757                         CHN_LOCK(wrch);
1758                         if (wrch->flags & CHN_F_TRIGGERED)
1759                                 *arg_i |= PCM_ENABLE_OUTPUT;
1760                         CHN_UNLOCK(wrch);
1761                 }
1762                 if (rdch) {
1763                         CHN_LOCK(rdch);
1764                         if (rdch->flags & CHN_F_TRIGGERED)
1765                                 *arg_i |= PCM_ENABLE_INPUT;
1766                         CHN_UNLOCK(rdch);
1767                 }
1768                 break;
1769
1770         case SNDCTL_DSP_GETODELAY:
1771                 if (wrch) {
1772                         struct snd_dbuf *bs = wrch->bufsoft;
1773
1774                         CHN_LOCK(wrch);
1775                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1776                         *arg_i = sndbuf_getready(bs);
1777                         CHN_UNLOCK(wrch);
1778                 } else
1779                         ret = EINVAL;
1780                 break;
1781
1782         case SNDCTL_DSP_POST:
1783                 if (wrch) {
1784                         CHN_LOCK(wrch);
1785                         wrch->flags &= ~CHN_F_NOTRIGGER;
1786                         chn_start(wrch, 1);
1787                         CHN_UNLOCK(wrch);
1788                 }
1789                 break;
1790
1791         case SNDCTL_DSP_SETDUPLEX:
1792                 /*
1793                  * switch to full-duplex mode if card is in half-duplex
1794                  * mode and is able to work in full-duplex mode
1795                  */
1796                 PCM_LOCK(d);
1797                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1798                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1799                 PCM_UNLOCK(d);
1800                 break;
1801
1802         /*
1803          * The following four ioctls are simple wrappers around mixer_ioctl
1804          * with no further processing.  xcmd is short for "translated
1805          * command".
1806          */
1807         case SNDCTL_DSP_GETRECVOL:
1808                 if (xcmd == 0) {
1809                         xcmd = SOUND_MIXER_READ_RECLEV;
1810                         chn = rdch;
1811                 }
1812                 /* FALLTHROUGH */
1813         case SNDCTL_DSP_SETRECVOL:
1814                 if (xcmd == 0) {
1815                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1816                         chn = rdch;
1817                 }
1818                 /* FALLTHROUGH */
1819         case SNDCTL_DSP_GETPLAYVOL:
1820                 if (xcmd == 0) {
1821                         xcmd = SOUND_MIXER_READ_PCM;
1822                         chn = wrch;
1823                 }
1824                 /* FALLTHROUGH */
1825         case SNDCTL_DSP_SETPLAYVOL:
1826                 if (xcmd == 0) {
1827                         xcmd = SOUND_MIXER_WRITE_PCM;
1828                         chn = wrch;
1829                 }
1830
1831                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1832                 if (ret != -1) {
1833                         PCM_GIANT_EXIT(d);
1834                         return (ret);
1835                 }
1836
1837                 if (d->mixer_dev != NULL) {
1838                         PCM_ACQUIRE_QUICK(d);
1839                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
1840                             MIXER_CMD_DIRECT);
1841                         PCM_RELEASE_QUICK(d);
1842                 } else
1843                         ret = ENOTSUP;
1844
1845                 break;
1846
1847         case SNDCTL_DSP_GET_RECSRC_NAMES:
1848         case SNDCTL_DSP_GET_RECSRC:
1849         case SNDCTL_DSP_SET_RECSRC:
1850                 if (d->mixer_dev != NULL) {
1851                         PCM_ACQUIRE_QUICK(d);
1852                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
1853                             MIXER_CMD_DIRECT);
1854                         PCM_RELEASE_QUICK(d);
1855                 } else
1856                         ret = ENOTSUP;
1857                 break;
1858
1859         /*
1860          * The following 3 ioctls aren't very useful at the moment.  For
1861          * now, only a single channel is associated with a cdev (/dev/dspN
1862          * instance), so there's only a single output routing to use (i.e.,
1863          * the wrch bound to this cdev).
1864          */
1865         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1866                 {
1867                         oss_mixer_enuminfo *ei;
1868                         ei = (oss_mixer_enuminfo *)arg;
1869                         ei->dev = 0;
1870                         ei->ctrl = 0;
1871                         ei->version = 0; /* static for now */
1872                         ei->strindex[0] = 0;
1873
1874                         if (wrch != NULL) {
1875                                 ei->nvalues = 1;
1876                                 strlcpy(ei->strings, wrch->name,
1877                                         sizeof(ei->strings));
1878                         } else {
1879                                 ei->nvalues = 0;
1880                                 ei->strings[0] = '\0';
1881                         }
1882                 }
1883                 break;
1884         case SNDCTL_DSP_GET_PLAYTGT:
1885         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1886                 /*
1887                  * Re: SET_PLAYTGT
1888                  *   OSSv4: "The value that was accepted by the device will
1889                  *   be returned back in the variable pointed by the
1890                  *   argument."
1891                  */
1892                 if (wrch != NULL)
1893                         *arg_i = 0;
1894                 else
1895                         ret = EINVAL;
1896                 break;
1897
1898         case SNDCTL_DSP_SILENCE:
1899         /*
1900          * Flush the software (pre-feed) buffer, but try to minimize playback
1901          * interruption.  (I.e., record unplayed samples with intent to
1902          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1903          * functionality.
1904          */
1905                 if (wrch == NULL)
1906                         ret = EINVAL;
1907                 else {
1908                         struct snd_dbuf *bs;
1909                         CHN_LOCK(wrch);
1910                         while (wrch->inprog != 0)
1911                                 cv_wait(&wrch->cv, wrch->lock);
1912                         bs = wrch->bufsoft;
1913                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1914                                 bs->sl = sndbuf_getready(bs);
1915                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1916                                 sndbuf_fillsilence(bs);
1917                                 chn_start(wrch, 0);
1918                         }
1919                         CHN_UNLOCK(wrch);
1920                 }
1921                 break;
1922
1923         case SNDCTL_DSP_SKIP:
1924         /*
1925          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1926          * playback buffer by moving the current write position immediately
1927          * before the point where the device is currently reading the samples."
1928          */
1929                 if (wrch == NULL)
1930                         ret = EINVAL;
1931                 else {
1932                         struct snd_dbuf *bs;
1933                         CHN_LOCK(wrch);
1934                         while (wrch->inprog != 0)
1935                                 cv_wait(&wrch->cv, wrch->lock);
1936                         bs = wrch->bufsoft;
1937                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1938                                 sndbuf_softreset(bs);
1939                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1940                                 bs->sl = 0;
1941                                 chn_start(wrch, 0);
1942                         }
1943                         CHN_UNLOCK(wrch);
1944                 }
1945                 break;
1946
1947         case SNDCTL_DSP_CURRENT_OPTR:
1948         case SNDCTL_DSP_CURRENT_IPTR:
1949         /**
1950          * @note Changing formats resets the buffer counters, which differs
1951          *       from the 4Front drivers.  However, I don't expect this to be
1952          *       much of a problem.
1953          *
1954          * @note In a test where @c CURRENT_OPTR is called immediately after write
1955          *       returns, this driver is about 32K samples behind whereas
1956          *       4Front's is about 8K samples behind.  Should determine source
1957          *       of discrepancy, even if only out of curiosity.
1958          *
1959          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1960          */
1961                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1962                 if (chn == NULL)
1963                         ret = EINVAL;
1964                 else {
1965                         struct snd_dbuf *bs;
1966                         /* int tmp; */
1967
1968                         oss_count_t *oc = (oss_count_t *)arg;
1969
1970                         CHN_LOCK(chn);
1971                         bs = chn->bufsoft;
1972 #if 0
1973                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1974                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1975                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1976 #else
1977                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1978                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1979 #endif
1980                         CHN_UNLOCK(chn);
1981                 }
1982                 break;
1983
1984         case SNDCTL_DSP_HALT_OUTPUT:
1985         case SNDCTL_DSP_HALT_INPUT:
1986                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1987                 if (chn == NULL)
1988                         ret = EINVAL;
1989                 else {
1990                         CHN_LOCK(chn);
1991                         chn_abort(chn);
1992                         CHN_UNLOCK(chn);
1993                 }
1994                 break;
1995
1996         case SNDCTL_DSP_LOW_WATER:
1997         /*
1998          * Set the number of bytes required to attract attention by
1999          * select/poll.
2000          */
2001                 if (wrch != NULL) {
2002                         CHN_LOCK(wrch);
2003                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
2004                         CHN_UNLOCK(wrch);
2005                 }
2006                 if (rdch != NULL) {
2007                         CHN_LOCK(rdch);
2008                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2009                         CHN_UNLOCK(rdch);
2010                 }
2011                 break;
2012
2013         case SNDCTL_DSP_GETERROR:
2014         /*
2015          * OSSv4 docs:  "All errors and counters will automatically be
2016          * cleared to zeroes after the call so each call will return only
2017          * the errors that occurred after the previous invocation. ... The
2018          * play_underruns and rec_overrun fields are the only usefull fields
2019          * returned by OSS 4.0."
2020          */
2021                 {
2022                         audio_errinfo *ei = (audio_errinfo *)arg;
2023
2024                         bzero((void *)ei, sizeof(*ei));
2025
2026                         if (wrch != NULL) {
2027                                 CHN_LOCK(wrch);
2028                                 ei->play_underruns = wrch->xruns;
2029                                 wrch->xruns = 0;
2030                                 CHN_UNLOCK(wrch);
2031                         }
2032                         if (rdch != NULL) {
2033                                 CHN_LOCK(rdch);
2034                                 ei->rec_overruns = rdch->xruns;
2035                                 rdch->xruns = 0;
2036                                 CHN_UNLOCK(rdch);
2037                         }
2038                 }
2039                 break;
2040
2041         case SNDCTL_DSP_SYNCGROUP:
2042                 PCM_ACQUIRE_QUICK(d);
2043                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2044                 PCM_RELEASE_QUICK(d);
2045                 break;
2046
2047         case SNDCTL_DSP_SYNCSTART:
2048                 PCM_ACQUIRE_QUICK(d);
2049                 ret = dsp_oss_syncstart(*arg_i);
2050                 PCM_RELEASE_QUICK(d);
2051                 break;
2052
2053         case SNDCTL_DSP_POLICY:
2054                 PCM_ACQUIRE_QUICK(d);
2055                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2056                 PCM_RELEASE_QUICK(d);
2057                 break;
2058
2059         case SNDCTL_DSP_COOKEDMODE:
2060                 PCM_ACQUIRE_QUICK(d);
2061                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2062                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2063                 PCM_RELEASE_QUICK(d);
2064                 break;
2065         case SNDCTL_DSP_GET_CHNORDER:
2066                 PCM_ACQUIRE_QUICK(d);
2067                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2068                 PCM_RELEASE_QUICK(d);
2069                 break;
2070         case SNDCTL_DSP_SET_CHNORDER:
2071                 PCM_ACQUIRE_QUICK(d);
2072                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2073                 PCM_RELEASE_QUICK(d);
2074                 break;
2075         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2076                 PCM_ACQUIRE_QUICK(d);
2077                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2078                 PCM_RELEASE_QUICK(d);
2079                 break;
2080         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2081                 ret = EINVAL;
2082                 break;
2083 #ifdef  OSSV4_EXPERIMENT
2084         /*
2085          * XXX The following ioctls are not yet supported and just return
2086          * EINVAL.
2087          */
2088         case SNDCTL_DSP_GETOPEAKS:
2089         case SNDCTL_DSP_GETIPEAKS:
2090                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2091                 if (chn == NULL)
2092                         ret = EINVAL;
2093                 else {
2094                         oss_peaks_t *op = (oss_peaks_t *)arg;
2095                         int lpeak, rpeak;
2096
2097                         CHN_LOCK(chn);
2098                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2099                         if (ret == -1)
2100                                 ret = EINVAL;
2101                         else {
2102                                 (*op)[0] = lpeak;
2103                                 (*op)[1] = rpeak;
2104                         }
2105                         CHN_UNLOCK(chn);
2106                 }
2107                 break;
2108
2109         /*
2110          * XXX Once implemented, revisit this for proper cv protection
2111          *     (if necessary).
2112          */
2113         case SNDCTL_GETLABEL:
2114                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2115                 break;
2116         case SNDCTL_SETLABEL:
2117                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2118                 break;
2119         case SNDCTL_GETSONG:
2120                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2121                 break;
2122         case SNDCTL_SETSONG:
2123                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2124                 break;
2125         case SNDCTL_SETNAME:
2126                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2127                 break;
2128 #if 0
2129         /**
2130          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2131          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2132          * 4Front Technologies.
2133          */
2134         case SNDCTL_DSP_READCTL:
2135         case SNDCTL_DSP_WRITECTL:
2136                 ret = EINVAL;
2137                 break;
2138 #endif  /* !0 (explicitly omitted ioctls) */
2139
2140 #endif  /* !OSSV4_EXPERIMENT */
2141         case SNDCTL_DSP_MAPINBUF:
2142         case SNDCTL_DSP_MAPOUTBUF:
2143         case SNDCTL_DSP_SETSYNCRO:
2144                 /* undocumented */
2145
2146         case SNDCTL_DSP_SUBDIVIDE:
2147         case SOUND_PCM_WRITE_FILTER:
2148         case SOUND_PCM_READ_FILTER:
2149                 /* dunno what these do, don't sound important */
2150
2151         default:
2152                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
2153                 ret = EINVAL;
2154                 break;
2155         }
2156
2157         PCM_GIANT_LEAVE(d);
2158
2159         return (ret);
2160 }
2161
2162 static int
2163 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
2164 {
2165         struct snddev_info *d;
2166         struct pcm_channel *wrch, *rdch;
2167         int ret, e;
2168
2169         d = dsp_get_info(i_dev);
2170         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev)) {
2171                 /* XXX many clients don't understand POLLNVAL */
2172                 return (events & (POLLHUP | POLLPRI | POLLIN |
2173                     POLLRDNORM | POLLOUT | POLLWRNORM));
2174         }
2175         PCM_GIANT_ENTER(d);
2176
2177         wrch = NULL;
2178         rdch = NULL;
2179         ret = 0;
2180
2181         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2182
2183         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
2184                 e = (events & (POLLOUT | POLLWRNORM));
2185                 if (e)
2186                         ret |= chn_poll(wrch, e, td);
2187         }
2188
2189         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
2190                 e = (events & (POLLIN | POLLRDNORM));
2191                 if (e)
2192                         ret |= chn_poll(rdch, e, td);
2193         }
2194
2195         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2196
2197         PCM_GIANT_LEAVE(d);
2198
2199         return (ret);
2200 }
2201
2202 static int
2203 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
2204     int nprot, vm_memattr_t *memattr)
2205 {
2206
2207         /* XXX memattr is not honored */
2208         *paddr = vtophys(offset);
2209         return (0);
2210 }
2211
2212 static int
2213 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
2214     vm_size_t size, struct vm_object **object, int nprot)
2215 {
2216         struct snddev_info *d;
2217         struct pcm_channel *wrch, *rdch, *c;
2218
2219         /*
2220          * Reject PROT_EXEC by default. It just doesn't makes sense.
2221          * Unfortunately, we have to give up this one due to linux_mmap
2222          * changes.
2223          *
2224          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2225          *
2226          */
2227 #ifdef SV_ABI_LINUX
2228         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2229             (dsp_mmap_allow_prot_exec == 0 &&
2230             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2231 #else
2232         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2233 #endif
2234                 return (EINVAL);
2235
2236         /*
2237          * PROT_READ (alone) selects the input buffer.
2238          * PROT_WRITE (alone) selects the output buffer.
2239          * PROT_WRITE|PROT_READ together select the output buffer.
2240          */
2241         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2242                 return (EINVAL);
2243
2244         d = dsp_get_info(i_dev);
2245         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
2246                 return (EINVAL);
2247
2248         PCM_GIANT_ENTER(d);
2249
2250         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2251
2252         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2253         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2254             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2255             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2256             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2257                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2258                 PCM_GIANT_EXIT(d);
2259                 return (EINVAL);
2260         }
2261
2262         if (wrch != NULL)
2263                 wrch->flags |= CHN_F_MMAP;
2264         if (rdch != NULL)
2265                 rdch->flags |= CHN_F_MMAP;
2266
2267         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2268         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2269         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
2270             size, nprot, *offset, curthread->td_ucred);
2271
2272         PCM_GIANT_LEAVE(d);
2273
2274         if (*object == NULL)
2275                  return (EINVAL);
2276         return (0);
2277 }
2278
2279 /* So much for dev_stdclone() */
2280 static int
2281 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
2282 {
2283         size_t len;
2284
2285         len = strlen(namep);
2286
2287         if (bcmp(name, namep, len) != 0)
2288                 return (ENODEV);
2289
2290         name += len;
2291
2292         if (isdigit(*name) == 0)
2293                 return (ENODEV);
2294
2295         len = strlen(sep);
2296
2297         if (*name == '0' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
2298                 return (ENODEV);
2299
2300         for (*u = 0; isdigit(*name) != 0; name++) {
2301                 *u *= 10;
2302                 *u += *name - '0';
2303                 if (*u > dsp_umax)
2304                         return (ENODEV);
2305         }
2306
2307         if (*name == '\0')
2308                 return ((use_sep == 0) ? 0 : ENODEV);
2309
2310         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
2311                 return (ENODEV);
2312
2313         name += len;
2314
2315         if (*name == '0' && name[1] != '\0')
2316                 return (ENODEV);
2317
2318         for (*c = 0; isdigit(*name) != 0; name++) {
2319                 *c *= 10;
2320                 *c += *name - '0';
2321                 if (*c > dsp_cmax)
2322                         return (ENODEV);
2323         }
2324
2325         if (*name != '\0')
2326                 return (ENODEV);
2327
2328         return (0);
2329 }
2330
2331 static void
2332 dsp_clone(void *arg,
2333 #if __FreeBSD_version >= 600034
2334     struct ucred *cred,
2335 #endif
2336     char *name, int namelen, struct cdev **dev)
2337 {
2338         struct snddev_info *d;
2339         struct snd_clone_entry *ce;
2340         struct pcm_channel *c;
2341         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2342         char *devname, *devcmp, *devsep;
2343
2344         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2345
2346         if (*dev != NULL)
2347                 return;
2348
2349         unit = -1;
2350         cunit = -1;
2351         devtype = -1;
2352         devhw = 0;
2353         devcmax = -1;
2354         tumax = -1;
2355         devname = NULL;
2356         devsep = NULL;
2357
2358         for (i = 0; unit == -1 &&
2359             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2360                 devtype = dsp_cdevs[i].type;
2361                 devcmp = dsp_cdevs[i].name;
2362                 devsep = dsp_cdevs[i].sep;
2363                 devname = dsp_cdevs[i].alias;
2364                 if (devname == NULL)
2365                         devname = devcmp;
2366                 devhw = dsp_cdevs[i].hw;
2367                 devcmax = dsp_cdevs[i].max - 1;
2368                 if (strcmp(name, devcmp) == 0) {
2369                         if (dsp_basename_clone != 0)
2370                                 unit = snd_unit;
2371                 } else if (dsp_stdclone(name, devcmp, devsep,
2372                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
2373                         unit = -1;
2374                         cunit = -1;
2375                 }
2376         }
2377
2378         d = devclass_get_softc(pcm_devclass, unit);
2379         if (!PCM_REGISTERED(d) || d->clones == NULL)
2380                 return;
2381
2382         /* XXX Need Giant magic entry ??? */
2383
2384         PCM_LOCK(d);
2385         if (snd_clone_disabled(d->clones)) {
2386                 PCM_UNLOCK(d);
2387                 return;
2388         }
2389
2390         PCM_WAIT(d);
2391         PCM_ACQUIRE(d);
2392         PCM_UNLOCK(d);
2393
2394         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2395
2396         if (devhw != 0) {
2397                 KASSERT(devcmax <= dsp_cmax,
2398                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2399                 if (cunit > devcmax) {
2400                         PCM_RELEASE_QUICK(d);
2401                         return;
2402                 }
2403                 udcmask |= snd_c2unit(cunit);
2404                 CHN_FOREACH(c, d, channels.pcm) {
2405                         CHN_LOCK(c);
2406                         if (c->unit != udcmask) {
2407                                 CHN_UNLOCK(c);
2408                                 continue;
2409                         }
2410                         CHN_UNLOCK(c);
2411                         udcmask &= ~snd_c2unit(cunit);
2412                         /*
2413                          * Temporarily increase clone maxunit to overcome
2414                          * vchan flexibility.
2415                          *
2416                          * # sysctl dev.pcm.0.play.vchans=256
2417                          * dev.pcm.0.play.vchans: 1 -> 256
2418                          * # cat /dev/zero > /dev/dsp0.vp255 &
2419                          * [1] 17296
2420                          * # sysctl dev.pcm.0.play.vchans=0
2421                          * dev.pcm.0.play.vchans: 256 -> 1
2422                          * # fg
2423                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2424                          * ^C
2425                          * # cat /dev/zero > /dev/dsp0.vp255
2426                          * zsh: operation not supported: /dev/dsp0.vp255
2427                          */
2428                         tumax = snd_clone_getmaxunit(d->clones);
2429                         if (cunit > tumax)
2430                                 snd_clone_setmaxunit(d->clones, cunit);
2431                         else
2432                                 tumax = -1;
2433                         goto dsp_clone_alloc;
2434                 }
2435                 /*
2436                  * Ok, so we're requesting unallocated vchan, but still
2437                  * within maximum vchan limit.
2438                  */
2439                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2440                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2441                     cunit < snd_maxautovchans) {
2442                         udcmask &= ~snd_c2unit(cunit);
2443                         tumax = snd_clone_getmaxunit(d->clones);
2444                         if (cunit > tumax)
2445                                 snd_clone_setmaxunit(d->clones, cunit);
2446                         else
2447                                 tumax = -1;
2448                         goto dsp_clone_alloc;
2449                 }
2450                 PCM_RELEASE_QUICK(d);
2451                 return;
2452         }
2453
2454 dsp_clone_alloc:
2455         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
2456         if (tumax != -1)
2457                 snd_clone_setmaxunit(d->clones, tumax);
2458         if (ce != NULL) {
2459                 udcmask |= snd_c2unit(cunit);
2460                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
2461                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
2462                     devname, unit, devsep, cunit);
2463                 snd_clone_register(ce, *dev);
2464         }
2465
2466         PCM_RELEASE_QUICK(d);
2467
2468         if (*dev != NULL)
2469                 dev_ref(*dev);
2470 }
2471
2472 static void
2473 dsp_sysinit(void *p)
2474 {
2475         if (dsp_ehtag != NULL)
2476                 return;
2477         /* initialize unit numbering */
2478         snd_unit_init();
2479         dsp_umax = PCMMAXUNIT;
2480         dsp_cmax = PCMMAXCHAN;
2481         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2482 }
2483
2484 static void
2485 dsp_sysuninit(void *p)
2486 {
2487         if (dsp_ehtag == NULL)
2488                 return;
2489         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2490         dsp_ehtag = NULL;
2491 }
2492
2493 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2494 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2495
2496 char *
2497 dsp_unit2name(char *buf, size_t len, int unit)
2498 {
2499         int i, dtype;
2500
2501         KASSERT(buf != NULL && len != 0,
2502             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2503
2504         dtype = snd_unit2d(unit);
2505
2506         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2507                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2508                         continue;
2509                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2510                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2511                 return (buf);
2512         }
2513
2514         return (NULL);
2515 }
2516
2517 /**
2518  * @brief Handler for SNDCTL_AUDIOINFO.
2519  *
2520  * Gathers information about the audio device specified in ai->dev.  If
2521  * ai->dev == -1, then this function gathers information about the current
2522  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2523  * return EINVAL.
2524  *
2525  * This routine is supposed to go practically straight to the hardware,
2526  * getting capabilities directly from the sound card driver, side-stepping
2527  * the intermediate channel interface.
2528  *
2529  * Note, however, that the usefulness of this command is significantly
2530  * decreased when requesting info about any device other than the one serving
2531  * the request. While each snddev_channel refers to a specific device node,
2532  * the converse is *not* true.  Currently, when a sound device node is opened,
2533  * the sound subsystem scans for an available audio channel (or channels, if
2534  * opened in read+write) and then assigns them to the si_drv[12] private
2535  * data fields.  As a result, any information returned linking a channel to
2536  * a specific character device isn't necessarily accurate.
2537  *
2538  * @note
2539  * Calling threads must not hold any snddev_info or pcm_channel locks.
2540  *
2541  * @param dev           device on which the ioctl was issued
2542  * @param ai            ioctl request data container
2543  *
2544  * @retval 0            success
2545  * @retval EINVAL       ai->dev specifies an invalid device
2546  *
2547  * @todo Verify correctness of Doxygen tags.  ;)
2548  */
2549 int
2550 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2551 {
2552         struct pcmchan_caps *caps;
2553         struct pcm_channel *ch;
2554         struct snddev_info *d;
2555         uint32_t fmts;
2556         int i, nchan, *rates, minch, maxch;
2557         char *devname, buf[CHN_NAMELEN];
2558
2559         /*
2560          * If probing the device that received the ioctl, make sure it's a
2561          * DSP device.  (Users may use this ioctl with /dev/mixer and
2562          * /dev/midi.)
2563          */
2564         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
2565                 return (EINVAL);
2566
2567         ch = NULL;
2568         devname = NULL;
2569         nchan = 0;
2570         bzero(buf, sizeof(buf));
2571
2572         /*
2573          * Search for the requested audio device (channel).  Start by
2574          * iterating over pcm devices.
2575          */
2576         for (i = 0; pcm_devclass != NULL &&
2577             i < devclass_get_maxunit(pcm_devclass); i++) {
2578                 d = devclass_get_softc(pcm_devclass, i);
2579                 if (!PCM_REGISTERED(d))
2580                         continue;
2581
2582                 /* XXX Need Giant magic entry ??? */
2583
2584                 /* See the note in function docblock */
2585                 PCM_UNLOCKASSERT(d);
2586                 PCM_LOCK(d);
2587
2588                 CHN_FOREACH(ch, d, channels.pcm) {
2589                         CHN_UNLOCKASSERT(ch);
2590                         CHN_LOCK(ch);
2591                         if (ai->dev == -1) {
2592                                 if (DSP_REGISTERED(d, i_dev) &&
2593                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2594                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2595                                         devname = dsp_unit2name(buf,
2596                                             sizeof(buf), ch->unit);
2597                                 }
2598                         } else if (ai->dev == nchan) {
2599                                 devname = dsp_unit2name(buf, sizeof(buf),
2600                                     ch->unit);
2601                         }
2602                         if (devname != NULL)
2603                                 break;
2604                         CHN_UNLOCK(ch);
2605                         ++nchan;
2606                 }
2607
2608                 if (devname != NULL) {
2609                         /*
2610                          * At this point, the following synchronization stuff
2611                          * has happened:
2612                          * - a specific PCM device is locked.
2613                          * - a specific audio channel has been locked, so be
2614                          *   sure to unlock when exiting;
2615                          */
2616
2617                         caps = chn_getcaps(ch);
2618
2619                         /*
2620                          * With all handles collected, zero out the user's
2621                          * container and begin filling in its fields.
2622                          */
2623                         bzero((void *)ai, sizeof(oss_audioinfo));
2624
2625                         ai->dev = nchan;
2626                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2627
2628                         if ((ch->flags & CHN_F_BUSY) == 0)
2629                                 ai->busy = 0;
2630                         else
2631                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2632
2633                         /**
2634                          * @note
2635                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2636                          *    this moment." Cop-out, I know, but I'll save
2637                          *    running around in the process table for later.
2638                          *    Is there a risk of leaking information?
2639                          */
2640                         ai->pid = ch->pid;
2641
2642                         /*
2643                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2644                          * Note, however, that a single channel operates in
2645                          * only one direction, so PCM_CAP_DUPLEX is out.
2646                          */
2647                         /**
2648                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2649                          *       these in pcmchan::caps?
2650                          */
2651                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2652                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2653
2654                         /*
2655                          * Collect formats supported @b natively by the
2656                          * device.  Also determine min/max channels.  (I.e.,
2657                          * mono, stereo, or both?)
2658                          *
2659                          * If any channel is stereo, maxch = 2;
2660                          * if all channels are stereo, minch = 2, too;
2661                          * if any channel is mono, minch = 1;
2662                          * and if all channels are mono, maxch = 1.
2663                          */
2664                         minch = 0;
2665                         maxch = 0;
2666                         fmts = 0;
2667                         for (i = 0; caps->fmtlist[i]; i++) {
2668                                 fmts |= caps->fmtlist[i];
2669                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2670                                         minch = (minch == 0) ? 2 : minch;
2671                                         maxch = 2;
2672                                 } else {
2673                                         minch = 1;
2674                                         maxch = (maxch == 0) ? 1 : maxch;
2675                                 }
2676                         }
2677
2678                         if (ch->direction == PCMDIR_PLAY)
2679                                 ai->oformats = fmts;
2680                         else
2681                                 ai->iformats = fmts;
2682
2683                         /**
2684                          * @note
2685                          * @c magic - OSSv4 docs: "Reserved for internal use
2686                          *    by OSS."
2687                          *
2688                          * @par
2689                          * @c card_number - OSSv4 docs: "Number of the sound
2690                          *    card where this device belongs or -1 if this
2691                          *    information is not available.  Applications
2692                          *    should normally not use this field for any
2693                          *    purpose."
2694                          */
2695                         ai->card_number = -1;
2696                         /**
2697                          * @todo @c song_name - depends first on
2698                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2699                          *          on SNDCTL_[GS]ETLABEL
2700                          * @todo @c port_number - routing information?
2701                          */
2702                         ai->port_number = -1;
2703                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2704                         /**
2705                          * @note
2706                          * @c real_device - OSSv4 docs:  "Obsolete."
2707                          */
2708                         ai->real_device = -1;
2709                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2710                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2711                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2712                         /**
2713                          * @note
2714                          * @c flags - OSSv4 docs: "Reserved for future use."
2715                          *
2716                          * @note
2717                          * @c binding - OSSv4 docs: "Reserved for future use."
2718                          *
2719                          * @todo @c handle - haven't decided how to generate
2720                          *       this yet; bus, vendor, device IDs?
2721                          */
2722                         ai->min_rate = caps->minspeed;
2723                         ai->max_rate = caps->maxspeed;
2724
2725                         ai->min_channels = minch;
2726                         ai->max_channels = maxch;
2727
2728                         ai->nrates = chn_getrates(ch, &rates);
2729                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2730                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2731
2732                         for (i = 0; i < ai->nrates; i++)
2733                                 ai->rates[i] = rates[i];
2734
2735                         ai->next_play_engine = 0;
2736                         ai->next_rec_engine = 0;
2737
2738                         CHN_UNLOCK(ch);
2739                 }
2740
2741                 PCM_UNLOCK(d);
2742
2743                 if (devname != NULL)
2744                         return (0);
2745         }
2746
2747         /* Exhausted the search -- nothing is locked, so return. */
2748         return (EINVAL);
2749 }
2750
2751 /**
2752  * @brief Assigns a PCM channel to a sync group.
2753  *
2754  * Sync groups are used to enable audio operations on multiple devices
2755  * simultaneously.  They may be used with any number of devices and may
2756  * span across applications.  Devices are added to groups with
2757  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2758  * SNDCTL_DSP_SYNCSTART ioctl.
2759  *
2760  * If the @c id field of the @c group parameter is set to zero, then a new
2761  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2762  * the group specified.
2763  *
2764  * @todo As far as memory allocation, should we assume that things are
2765  *       okay and allocate with M_WAITOK before acquiring channel locks,
2766  *       freeing later if not?
2767  *
2768  * @param wrch  output channel associated w/ device (if any)
2769  * @param rdch  input channel associated w/ device (if any)
2770  * @param group Sync group parameters
2771  *
2772  * @retval 0            success
2773  * @retval non-zero     error to be propagated upstream
2774  */
2775 static int
2776 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2777 {
2778         struct pcmchan_syncmember *smrd, *smwr;
2779         struct pcmchan_syncgroup *sg;
2780         int ret, sg_ids[3];
2781
2782         smrd = NULL;
2783         smwr = NULL;
2784         sg = NULL;
2785         ret = 0;
2786
2787         /*
2788          * Free_unr() may sleep, so store released syncgroup IDs until after
2789          * all locks are released.
2790          */
2791         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2792
2793         PCM_SG_LOCK();
2794
2795         /*
2796          * - Insert channel(s) into group's member list.
2797          * - Set CHN_F_NOTRIGGER on channel(s).
2798          * - Stop channel(s).
2799          */
2800
2801         /*
2802          * If device's channels are already mapped to a group, unmap them.
2803          */
2804         if (wrch) {
2805                 CHN_LOCK(wrch);
2806                 sg_ids[0] = chn_syncdestroy(wrch);
2807         }
2808
2809         if (rdch) {
2810                 CHN_LOCK(rdch);
2811                 sg_ids[1] = chn_syncdestroy(rdch);
2812         }
2813
2814         /*
2815          * Verify that mode matches character device properites.
2816          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2817          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2818          */
2819         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2820             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2821                 ret = EINVAL;
2822                 goto out;
2823         }
2824
2825         /*
2826          * An id of zero indicates the user wants to create a new
2827          * syncgroup.
2828          */
2829         if (group->id == 0) {
2830                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
2831                 if (sg != NULL) {
2832                         SLIST_INIT(&sg->members);
2833                         sg->id = alloc_unr(pcmsg_unrhdr);
2834
2835                         group->id = sg->id;
2836                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2837                 } else
2838                         ret = ENOMEM;
2839         } else {
2840                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2841                         if (sg->id == group->id)
2842                                 break;
2843                 }
2844                 if (sg == NULL)
2845                         ret = EINVAL;
2846         }
2847
2848         /* Couldn't create or find a syncgroup.  Fail. */
2849         if (sg == NULL)
2850                 goto out;
2851
2852         /*
2853          * Allocate a syncmember, assign it and a channel together, and
2854          * insert into syncgroup.
2855          */
2856         if (group->mode & PCM_ENABLE_INPUT) {
2857                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
2858                 if (smrd == NULL) {
2859                         ret = ENOMEM;
2860                         goto out;
2861                 }
2862
2863                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2864                 smrd->parent = sg;
2865                 smrd->ch = rdch;
2866
2867                 chn_abort(rdch);
2868                 rdch->flags |= CHN_F_NOTRIGGER;
2869                 rdch->sm = smrd;
2870         }
2871
2872         if (group->mode & PCM_ENABLE_OUTPUT) {
2873                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
2874                 if (smwr == NULL) {
2875                         ret = ENOMEM;
2876                         goto out;
2877                 }
2878
2879                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2880                 smwr->parent = sg;
2881                 smwr->ch = wrch;
2882
2883                 chn_abort(wrch);
2884                 wrch->flags |= CHN_F_NOTRIGGER;
2885                 wrch->sm = smwr;
2886         }
2887
2888
2889 out:
2890         if (ret != 0) {
2891                 if (smrd != NULL)
2892                         free(smrd, M_DEVBUF);
2893                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2894                         sg_ids[2] = sg->id;
2895                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2896                         free(sg, M_DEVBUF);
2897                 }
2898
2899                 if (wrch)
2900                         wrch->sm = NULL;
2901                 if (rdch)
2902                         rdch->sm = NULL;
2903         }
2904
2905         if (wrch)
2906                 CHN_UNLOCK(wrch);
2907         if (rdch)
2908                 CHN_UNLOCK(rdch);
2909
2910         PCM_SG_UNLOCK();
2911
2912         if (sg_ids[0])
2913                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2914         if (sg_ids[1])
2915                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2916         if (sg_ids[2])
2917                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2918
2919         return (ret);
2920 }
2921
2922 /**
2923  * @brief Launch a sync group into action
2924  *
2925  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2926  * iterates over all members, triggering them along the way.
2927  *
2928  * @note Caller must not hold any channel locks.
2929  *
2930  * @param sg_id sync group identifier
2931  *
2932  * @retval 0    success
2933  * @retval non-zero     error worthy of propagating upstream to user
2934  */
2935 static int
2936 dsp_oss_syncstart(int sg_id)
2937 {
2938         struct pcmchan_syncmember *sm, *sm_tmp;
2939         struct pcmchan_syncgroup *sg;
2940         struct pcm_channel *c;
2941         int ret, needlocks;
2942
2943         /* Get the synclists lock */
2944         PCM_SG_LOCK();
2945
2946         do {
2947                 ret = 0;
2948                 needlocks = 0;
2949
2950                 /* Search for syncgroup by ID */
2951                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2952                         if (sg->id == sg_id)
2953                                 break;
2954                 }
2955
2956                 /* Return EINVAL if not found */
2957                 if (sg == NULL) {
2958                         ret = EINVAL;
2959                         break;
2960                 }
2961
2962                 /* Any removals resulting in an empty group should've handled this */
2963                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
2964
2965                 /*
2966                  * Attempt to lock all member channels - if any are already
2967                  * locked, unlock those acquired, sleep for a bit, and try
2968                  * again.
2969                  */
2970                 SLIST_FOREACH(sm, &sg->members, link) {
2971                         if (CHN_TRYLOCK(sm->ch) == 0) {
2972                                 int timo = hz * 5/1000;
2973                                 if (timo < 1)
2974                                         timo = 1;
2975
2976                                 /* Release all locked channels so far, retry */
2977                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
2978                                         /* sm is the member already locked */
2979                                         if (sm == sm_tmp)
2980                                                 break;
2981                                         CHN_UNLOCK(sm_tmp->ch);
2982                                 }
2983
2984                                 /** @todo Is PRIBIO correct/ */
2985                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
2986                                     PRIBIO | PCATCH, "pcmsg", timo);
2987                                 if (ret == EINTR || ret == ERESTART)
2988                                         break;
2989
2990                                 needlocks = 1;
2991                                 ret = 0; /* Assumes ret == EAGAIN... */
2992                         }
2993                 }
2994         } while (needlocks && ret == 0);
2995
2996         /* Proceed only if no errors encountered. */
2997         if (ret == 0) {
2998                 /* Launch channels */
2999                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
3000                         SLIST_REMOVE_HEAD(&sg->members, link);
3001
3002                         c = sm->ch;
3003                         c->sm = NULL;
3004                         chn_start(c, 1);
3005                         c->flags &= ~CHN_F_NOTRIGGER;
3006                         CHN_UNLOCK(c);
3007
3008                         free(sm, M_DEVBUF);
3009                 }
3010
3011                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3012                 free(sg, M_DEVBUF);
3013         }
3014
3015         PCM_SG_UNLOCK();
3016
3017         /*
3018          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3019          * first.
3020          */
3021         if (ret == 0)
3022                 free_unr(pcmsg_unrhdr, sg_id);
3023
3024         return (ret);
3025 }
3026
3027 /**
3028  * @brief Handler for SNDCTL_DSP_POLICY
3029  *
3030  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3031  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3032  * specifying those two parameters, s/he simply selects a number from 0..10
3033  * which corresponds to a buffer size.  Smaller numbers request smaller
3034  * buffers with lower latencies (at greater overhead from more frequent
3035  * interrupts), while greater numbers behave in the opposite manner.
3036  *
3037  * The 4Front spec states that a value of 5 should be the default.  However,
3038  * this implementation deviates slightly by using a linear scale without
3039  * consulting drivers.  I.e., even though drivers may have different default
3040  * buffer sizes, a policy argument of 5 will have the same result across
3041  * all drivers.
3042  *
3043  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3044  * more information.
3045  *
3046  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3047  *       work with hardware drivers directly.
3048  *
3049  * @note PCM channel arguments must not be locked by caller.
3050  *
3051  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3052  * @param rdch  " recording channel (optional; may be NULL)
3053  * @param policy Integer from [0:10]
3054  *
3055  * @retval 0    constant (for now)
3056  */
3057 static int
3058 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3059 {
3060         int ret;
3061
3062         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3063                 return (EIO);
3064
3065         /* Default: success */
3066         ret = 0;
3067
3068         if (rdch) {
3069                 CHN_LOCK(rdch);
3070                 ret = chn_setlatency(rdch, policy);
3071                 CHN_UNLOCK(rdch);
3072         }
3073
3074         if (wrch && ret == 0) {
3075                 CHN_LOCK(wrch);
3076                 ret = chn_setlatency(wrch, policy);
3077                 CHN_UNLOCK(wrch);
3078         }
3079
3080         if (ret)
3081                 ret = EIO;
3082
3083         return (ret);
3084 }
3085
3086 /**
3087  * @brief Enable or disable "cooked" mode
3088  *
3089  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3090  * is the default, the sound system handles rate and format conversions
3091  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3092  * operates with 44100Hz/16bit/signed samples).
3093  *
3094  * Disabling cooked mode is intended for applications wanting to mmap()
3095  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3096  * feeder architecture, presumably to gain as much control over audio
3097  * hardware as possible.
3098  *
3099  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3100  * for more details.
3101  *
3102  * @param wrch          playback channel (optional; may be NULL)
3103  * @param rdch          recording channel (optional; may be NULL)
3104  * @param enabled       0 = raw mode, 1 = cooked mode
3105  *
3106  * @retval EINVAL       Operation not yet supported.
3107  */
3108 static int
3109 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3110 {
3111
3112         /*
3113          * XXX I just don't get it. Why don't they call it
3114          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3115          * This is just plain so confusing, incoherent,
3116          * <insert any non-printable characters here>.
3117          */
3118         if (!(enabled == 1 || enabled == 0))
3119                 return (EINVAL);
3120
3121         /*
3122          * I won't give in. I'm inverting its logic here and now.
3123          * Brag all you want, but "BITPERFECT" should be the better
3124          * term here.
3125          */
3126         enabled ^= 0x00000001;
3127
3128         if (wrch != NULL) {
3129                 CHN_LOCK(wrch);
3130                 wrch->flags &= ~CHN_F_BITPERFECT;
3131                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3132                 CHN_UNLOCK(wrch);
3133         }
3134
3135         if (rdch != NULL) {
3136                 CHN_LOCK(rdch);
3137                 rdch->flags &= ~CHN_F_BITPERFECT;
3138                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3139                 CHN_UNLOCK(rdch);
3140         }
3141
3142         return (0);
3143 }
3144
3145 /**
3146  * @brief Retrieve channel interleaving order
3147  *
3148  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3149  *
3150  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3151  * for more details.
3152  *
3153  * @note As the ioctl definition is still under construction, FreeBSD
3154  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3155  *
3156  * @param wrch  playback channel (optional; may be NULL)
3157  * @param rdch  recording channel (optional; may be NULL)
3158  * @param map   channel map (result will be stored there)
3159  *
3160  * @retval EINVAL       Operation not yet supported.
3161  */
3162 static int
3163 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3164 {
3165         struct pcm_channel *ch;
3166         int ret;
3167
3168         ch = (wrch != NULL) ? wrch : rdch;
3169         if (ch != NULL) {
3170                 CHN_LOCK(ch);
3171                 ret = chn_oss_getorder(ch, map);
3172                 CHN_UNLOCK(ch);
3173         } else
3174                 ret = EINVAL;
3175
3176         return (ret);
3177 }
3178
3179 /**
3180  * @brief Specify channel interleaving order
3181  *
3182  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3183  *
3184  * @note As the ioctl definition is still under construction, FreeBSD
3185  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3186  *
3187  * @param wrch  playback channel (optional; may be NULL)
3188  * @param rdch  recording channel (optional; may be NULL)
3189  * @param map   channel map
3190  *
3191  * @retval EINVAL       Operation not yet supported.
3192  */
3193 static int
3194 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3195 {
3196         int ret;
3197
3198         ret = 0;
3199
3200         if (wrch != NULL) {
3201                 CHN_LOCK(wrch);
3202                 ret = chn_oss_setorder(wrch, map);
3203                 CHN_UNLOCK(wrch);
3204         }
3205
3206         if (ret == 0 && rdch != NULL) {
3207                 CHN_LOCK(rdch);
3208                 ret = chn_oss_setorder(rdch, map);
3209                 CHN_UNLOCK(rdch);
3210         }
3211
3212         return (ret);
3213 }
3214
3215 static int
3216 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3217     int *mask)
3218 {
3219         struct pcm_channel *ch;
3220         uint32_t chnmask;
3221         int ret;
3222
3223         chnmask = 0;
3224         ch = (wrch != NULL) ? wrch : rdch;
3225
3226         if (ch != NULL) {
3227                 CHN_LOCK(ch);
3228                 ret = chn_oss_getmask(ch, &chnmask);
3229                 CHN_UNLOCK(ch);
3230         } else
3231                 ret = EINVAL;
3232
3233         if (ret == 0)
3234                 *mask = chnmask;
3235
3236         return (ret);
3237 }
3238
3239 #ifdef OSSV4_EXPERIMENT
3240 /**
3241  * @brief Retrieve an audio device's label
3242  *
3243  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3244  *
3245  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3246  * for more details.
3247  *
3248  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3249  * consoles) can show variable "labels" for certain controls. By default
3250  * the application name (say quake) is shown as the label but
3251  * applications may change the labels themselves."
3252  *
3253  * @note As the ioctl definition is still under construction, FreeBSD
3254  *       does not currently support @c SNDCTL_GETLABEL.
3255  *
3256  * @param wrch  playback channel (optional; may be NULL)
3257  * @param rdch  recording channel (optional; may be NULL)
3258  * @param label label gets copied here
3259  *
3260  * @retval EINVAL       Operation not yet supported.
3261  */
3262 static int
3263 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3264 {
3265         return (EINVAL);
3266 }
3267
3268 /**
3269  * @brief Specify an audio device's label
3270  *
3271  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3272  * comments for @c dsp_oss_getlabel immediately above.
3273  *
3274  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3275  * for more details.
3276  *
3277  * @note As the ioctl definition is still under construction, FreeBSD
3278  *       does not currently support SNDCTL_SETLABEL.
3279  *
3280  * @param wrch  playback channel (optional; may be NULL)
3281  * @param rdch  recording channel (optional; may be NULL)
3282  * @param label label gets copied from here
3283  *
3284  * @retval EINVAL       Operation not yet supported.
3285  */
3286 static int
3287 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3288 {
3289         return (EINVAL);
3290 }
3291
3292 /**
3293  * @brief Retrieve name of currently played song
3294  *
3295  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3296  * tell the system the name of the currently playing song, which would be
3297  * visible in @c /dev/sndstat.
3298  *
3299  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3300  * for more details.
3301  *
3302  * @note As the ioctl definition is still under construction, FreeBSD
3303  *       does not currently support SNDCTL_GETSONG.
3304  *
3305  * @param wrch  playback channel (optional; may be NULL)
3306  * @param rdch  recording channel (optional; may be NULL)
3307  * @param song  song name gets copied here
3308  *
3309  * @retval EINVAL       Operation not yet supported.
3310  */
3311 static int
3312 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3313 {
3314         return (EINVAL);
3315 }
3316
3317 /**
3318  * @brief Retrieve name of currently played song
3319  *
3320  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3321  * tell the system the name of the currently playing song, which would be
3322  * visible in @c /dev/sndstat.
3323  *
3324  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3325  * for more details.
3326  *
3327  * @note As the ioctl definition is still under construction, FreeBSD
3328  *       does not currently support SNDCTL_SETSONG.
3329  *
3330  * @param wrch  playback channel (optional; may be NULL)
3331  * @param rdch  recording channel (optional; may be NULL)
3332  * @param song  song name gets copied from here
3333  *
3334  * @retval EINVAL       Operation not yet supported.
3335  */
3336 static int
3337 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3338 {
3339         return (EINVAL);
3340 }
3341
3342 /**
3343  * @brief Rename a device
3344  *
3345  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3346  *
3347  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3348  * more details.
3349  *
3350  * From Hannu@4Front:  "This call is used to change the device name
3351  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3352  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3353  * name depending on the current context (for example 'OSS virtual wave table
3354  * synth' or 'VoIP link to London')."
3355  *
3356  * @note As the ioctl definition is still under construction, FreeBSD
3357  *       does not currently support SNDCTL_SETNAME.
3358  *
3359  * @param wrch  playback channel (optional; may be NULL)
3360  * @param rdch  recording channel (optional; may be NULL)
3361  * @param name  new device name gets copied from here
3362  *
3363  * @retval EINVAL       Operation not yet supported.
3364  */
3365 static int
3366 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3367 {
3368         return (EINVAL);
3369 }
3370 #endif  /* !OSSV4_EXPERIMENT */