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/devfs.h>
  36 #include <sys/device.h>
  37 #include <sys/eventhandler.h>
  38 #include <sys/lock.h>
  39 #include <sys/sysent.h>
  40
  41 #include <vm/vm.h>
  42 #include <vm/vm_object.h>
  43 #include <vm/vm_page.h>
  44 #include <vm/vm_pager.h>
  45
  46 SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pcm/dsp.c 274035 2014-11-03 11:11:45Z bapt $");
  47
  48 static int dsp_mmap_allow_prot_exec = 0;
  49 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
  50     &dsp_mmap_allow_prot_exec, 0,
  51     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
  52
  53 struct dsp_cdevinfo {
  54         struct pcm_channel *rdch, *wrch;
  55         struct pcm_channel *volch;
  56         int busy, simplex;
  57         TAILQ_ENTRY(dsp_cdevinfo) link;
  58 };
  59
  60 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
  61 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
  62 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
  63 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
  64
  65 #define DSP_CDEVINFO_CACHESIZE  8
  66
  67 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
  68                                  (y) != NULL && (y)->si_drv1 != NULL)
  69
  70 #define OLDPCM_IOCTL
  71
  72 static d_open_t dsp_open;
  73 static d_close_t dsp_close;
  74 static d_read_t dsp_read;
  75 static d_write_t dsp_write;
  76 static d_ioctl_t dsp_ioctl;
  77 static d_kqfilter_t dsp_kqfilter;
  78 static d_mmap_t dsp_mmap;
  79 static d_mmap_single_t dsp_mmap_single;
  80
  81 static void dsp_filter_detach(struct knote *);
  82 static int dsp_filter_read(struct knote *, long);
  83 static int dsp_filter_write(struct knote *, long);
  84
  85 DEVFS_DEFINE_CLONE_BITMAP(dsp);
  86
  87 struct dev_ops dsp_ops = {
  88         { "sound", 0, D_MPSAFE },
  89         .d_open =       dsp_open,
  90         .d_close =      dsp_close,
  91         .d_read =       dsp_read,
  92         .d_write =      dsp_write,
  93         .d_ioctl =      dsp_ioctl,
  94         .d_kqfilter =   dsp_kqfilter,
  95         .d_mmap =       dsp_mmap,
  96         .d_mmap_single = dsp_mmap_single,
  97 };
  98
  99 static eventhandler_tag dsp_ehtag = NULL;
 100 static int dsp_umax = -1;
 101 static int dsp_cmax = -1;
 102
 103 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
 104 static int dsp_oss_syncstart(int sg_id);
 105 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
 106 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
 107 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 108 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
 109 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
 110 #ifdef OSSV4_EXPERIMENT
 111 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 112 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
 113 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 114 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
 115 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
 116 #endif
 117
 118 static struct snddev_info *
 119 dsp_get_info(struct cdev *dev)
 120 {
 121         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
 122 }
 123
 124 static uint32_t
 125 dsp_get_flags(struct cdev *dev)
 126 {
 127         device_t bdev;
 128
 129         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 130
 131         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
 132 }
 133
 134 static void
 135 dsp_set_flags(struct cdev *dev, uint32_t flags)
 136 {
 137         device_t bdev;
 138
 139         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
 140
 141         if (bdev != NULL)
 142                 pcm_setflags(bdev, flags);
 143 }
 144
 145 /*
 146  * return the channels associated with an open device instance.
 147  * lock channels specified.
 148  */
 149 static int
 150 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
 151     uint32_t prio)
 152 {
 153         struct snddev_info *d;
 154         struct pcm_channel *ch;
 155         uint32_t flags;
 156
 157         if (PCM_SIMPLEX(dev) != 0) {
 158                 d = dsp_get_info(dev);
 159                 if (!PCM_REGISTERED(d))
 160                         return (ENXIO);
 161                 PCM_LOCK(d);
 162                 PCM_WAIT(d);
 163                 PCM_ACQUIRE(d);
 164                 /*
 165                  * Note: order is important -
 166                  *       pcm flags -> prio query flags -> wild guess
 167                  */
 168                 ch = NULL;
 169                 flags = dsp_get_flags(dev);
 170                 if (flags & SD_F_PRIO_WR) {
 171                         ch = PCM_RDCH(dev);
 172                         PCM_RDCH(dev) = NULL;
 173                 } else if (flags & SD_F_PRIO_RD) {
 174                         ch = PCM_WRCH(dev);
 175                         PCM_WRCH(dev) = NULL;
 176                 } else if (prio & SD_F_PRIO_WR) {
 177                         ch = PCM_RDCH(dev);
 178                         PCM_RDCH(dev) = NULL;
 179                         flags |= SD_F_PRIO_WR;
 180                 } else if (prio & SD_F_PRIO_RD) {
 181                         ch = PCM_WRCH(dev);
 182                         PCM_WRCH(dev) = NULL;
 183                         flags |= SD_F_PRIO_RD;
 184                 } else if (PCM_WRCH(dev) != NULL) {
 185                         ch = PCM_RDCH(dev);
 186                         PCM_RDCH(dev) = NULL;
 187                         flags |= SD_F_PRIO_WR;
 188                 } else if (PCM_RDCH(dev) != NULL) {
 189                         ch = PCM_WRCH(dev);
 190                         PCM_WRCH(dev) = NULL;
 191                         flags |= SD_F_PRIO_RD;
 192                 }
 193                 PCM_SIMPLEX(dev) = 0;
 194                 dsp_set_flags(dev, flags);
 195                 if (ch != NULL) {
 196                         CHN_LOCK(ch);
 197                         pcm_chnref(ch, -1);
 198                         pcm_chnrelease(ch);
 199                 }
 200                 PCM_RELEASE(d);
 201                 PCM_UNLOCK(d);
 202         }
 203
 204         *rdch = PCM_RDCH(dev);
 205         *wrch = PCM_WRCH(dev);
 206
 207         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
 208                 CHN_LOCK(*rdch);
 209         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
 210                 CHN_LOCK(*wrch);
 211
 212         return (0);
 213 }
 214
 215 /* unlock specified channels */
 216 static void
 217 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
 218     uint32_t prio)
 219 {
 220         if (wrch != NULL && (prio & SD_F_PRIO_WR))
 221                 CHN_UNLOCK(wrch);
 222         if (rdch != NULL && (prio & SD_F_PRIO_RD))
 223                 CHN_UNLOCK(rdch);
 224 }
 225
 226 static void
 227 dsp_cdevinfo_alloc(struct cdev *dev,
 228     struct pcm_channel *rdch, struct pcm_channel *wrch,
 229     struct pcm_channel *volch)
 230 {
 231         struct snddev_info *d;
 232         struct dsp_cdevinfo *cdi;
 233         int simplex;
 234
 235         d = dsp_get_info(dev);
 236
 237         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
 238             ((rdch == NULL && wrch == NULL) || rdch != wrch),
 239             ("bogus %s(), what are you trying to accomplish here?", __func__));
 240         PCM_BUSYASSERT(d);
 241         PCM_LOCKASSERT(d);
 242
 243         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
 244
 245         /*
 246          * Scan for free instance entry and put it into the end of list.
 247          * Create new one if necessary.
 248          */
 249         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
 250                 if (cdi->busy != 0)
 251                         break;
 252                 cdi->rdch = rdch;
 253                 cdi->wrch = wrch;
 254                 cdi->volch = volch;
 255                 cdi->simplex = simplex;
 256                 cdi->busy = 1;
 257                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 258                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 259                 dev->si_drv1 = cdi;
 260                 return;
 261         }
 262         PCM_UNLOCK(d);
 263         cdi = kmalloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 264         PCM_LOCK(d);
 265         cdi->rdch = rdch;
 266         cdi->wrch = wrch;
 267         cdi->volch = volch;
 268         cdi->simplex = simplex;
 269         cdi->busy = 1;
 270         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
 271         dev->si_drv1 = cdi;
 272 }
 273
 274 static void
 275 dsp_cdevinfo_free(struct cdev *dev)
 276 {
 277         struct snddev_info *d;
 278         struct dsp_cdevinfo *cdi, *tmp;
 279         uint32_t flags;
 280         int i;
 281
 282         d = dsp_get_info(dev);
 283
 284         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
 285             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
 286             PCM_VOLCH(dev) == NULL,
 287             ("bogus %s(), what are you trying to accomplish here?", __func__));
 288         PCM_BUSYASSERT(d);
 289         PCM_LOCKASSERT(d);
 290
 291         cdi = dev->si_drv1;
 292         dev->si_drv1 = NULL;
 293         cdi->rdch = NULL;
 294         cdi->wrch = NULL;
 295         cdi->volch = NULL;
 296         cdi->simplex = 0;
 297         cdi->busy = 0;
 298
 299         /*
 300          * Once it is free, move it back to the beginning of list for
 301          * faster new entry allocation.
 302          */
 303         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 304         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 305
 306         /*
 307          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
 308          * Reset simplex flags.
 309          */
 310         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
 311         i = DSP_CDEVINFO_CACHESIZE;
 312         TAILQ_FOREACH_MUTABLE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
 313                 if (cdi->busy != 0) {
 314                         if (cdi->simplex == 0) {
 315                                 if (cdi->rdch != NULL)
 316                                         flags |= SD_F_PRIO_RD;
 317                                 if (cdi->wrch != NULL)
 318                                         flags |= SD_F_PRIO_WR;
 319                         }
 320                 } else {
 321                         if (i == 0) {
 322                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
 323                                 kfree(cdi, M_DEVBUF);
 324                         } else
 325                                 i--;
 326                 }
 327         }
 328         dsp_set_flags(dev, flags);
 329 }
 330
 331 void
 332 dsp_cdevinfo_init(struct snddev_info *d)
 333 {
 334         struct dsp_cdevinfo *cdi;
 335         int i;
 336
 337         KASSERT(d != NULL, ("NULL snddev_info"));
 338         PCM_BUSYASSERT(d);
 339         PCM_UNLOCKASSERT(d);
 340
 341         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 342         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
 343                 cdi = kmalloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
 344                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
 345         }
 346 }
 347
 348 void
 349 dsp_cdevinfo_flush(struct snddev_info *d)
 350 {
 351         struct dsp_cdevinfo *cdi, *tmp;
 352
 353         KASSERT(d != NULL, ("NULL snddev_info"));
 354         PCM_BUSYASSERT(d);
 355         PCM_UNLOCKASSERT(d);
 356
 357         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
 358         while (cdi != NULL) {
 359                 tmp = TAILQ_NEXT(cdi, link);
 360                 kfree(cdi, M_DEVBUF);
 361                 cdi = tmp;
 362         }
 363         TAILQ_INIT(&d->dsp_cdevinfo_pool);
 364 }
 365
 366 /* duplex / simplex cdev type */
 367 enum {
 368         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
 369         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
 370         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
 371 };
 372
 373 enum {
 374         DSP_CDEV_VOLCTL_NONE,
 375         DSP_CDEV_VOLCTL_READ,
 376         DSP_CDEV_VOLCTL_WRITE
 377 };
 378
 379 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
 380 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
 381 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
 382 #define DSP_F_READ(x)           ((x) & FREAD)
 383 #define DSP_F_WRITE(x)          ((x) & FWRITE)
 384
 385 static const struct {
 386         int type;
 387         char *name;
 388         char *sep;
 389         char *alias;
 390         int use_sep;
 391         int hw;
 392         int max;
 393         int volctl;
 394         uint32_t fmt, spd;
 395         int query;
 396 } dsp_cdevs[] = {
 397         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
 398           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 399           DSP_CDEV_TYPE_RDWR },
 400         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
 401           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
 402           DSP_CDEV_TYPE_RDWR },
 403         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
 404           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
 405           DSP_CDEV_TYPE_RDWR },
 406         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
 407           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 408         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
 409           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
 410         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
 411           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 412         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
 413           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
 414         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
 415           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
 416         /* Low priority, OSSv4 aliases. */
 417         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
 418           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 419           DSP_CDEV_TYPE_RDWR },
 420         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
 421           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 422           DSP_CDEV_TYPE_RDWR },
 423         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
 424           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 425           DSP_CDEV_TYPE_RDWR },
 426         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
 427           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 428           DSP_CDEV_TYPE_RDWR },
 429         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
 430           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
 431           DSP_CDEV_TYPE_RDWR },
 432 };
 433
 434 #define DSP_FIXUP_ERROR()               do {                            \
 435         prio = dsp_get_flags(i_dev);                                    \
 436         if (!DSP_F_VALID(flags))                                        \
 437                 error = EINVAL;                                         \
 438         if (!DSP_F_DUPLEX(flags) &&                                     \
 439             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
 440             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
 441                 error = ENOTSUP;                                        \
 442         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
 443             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
 444             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
 445                 error = EBUSY;                                          \
 446         else if (DSP_REGISTERED(d, i_dev))                              \
 447                 error = EBUSY;                                          \
 448 } while (0)
 449
 450 static int
 451 dsp_open(struct dev_open_args *ap)
 452 {
 453         struct cdev *i_dev = ap->a_head.a_dev;
 454         int flags = ap->a_oflags;
 455         struct pcm_channel *rdch, *wrch;
 456         struct snddev_info *d;
 457         uint32_t fmt, spd, prio, volctl;
 458         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
 459
 460         /* Kind of impossible.. */
 461         if (i_dev == NULL)
 462                 return (ENODEV);
 463
 464         d = dsp_get_info(i_dev);
 465         if (!PCM_REGISTERED(d))
 466                 return (EBADF);
 467
 468         PCM_GIANT_ENTER(d);
 469
 470         /* Lock snddev so nobody else can monkey with it. */
 471         PCM_LOCK(d);
 472         PCM_WAIT(d);
 473
 474         /*
 475          * Try to acquire cloned device before someone else pick it.
 476          * ENODEV means this is not a cloned droids.
 477          */
 478         error = snd_clone_acquire(i_dev);
 479         if (!(error == 0 || error == ENODEV)) {
 480                 DSP_FIXUP_ERROR();
 481                 PCM_UNLOCK(d);
 482                 PCM_GIANT_EXIT(d);
 483                 return (error);
 484         }
 485
 486         error = 0;
 487         DSP_FIXUP_ERROR();
 488
 489         if (error != 0) {
 490                 (void)snd_clone_release(i_dev);
 491                 PCM_UNLOCK(d);
 492                 PCM_GIANT_EXIT(d);
 493                 return (error);
 494         }
 495
 496         /*
 497          * That is just enough. Acquire and unlock pcm lock so
 498          * the other will just have to wait until we finish doing
 499          * everything.
 500          */
 501         PCM_ACQUIRE(d);
 502         PCM_UNLOCK(d);
 503
 504         devtype = PCMDEV(i_dev);
 505         wdevunit = -1;
 506         rdevunit = -1;
 507         fmt = 0;
 508         spd = 0;
 509         volctl = DSP_CDEV_VOLCTL_NONE;
 510
 511         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 512                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 513                         continue;
 514                 /*
 515                  * Volume control only valid for DSPHW devices,
 516                  * and it must be opened in opposite direction be it
 517                  * simplex or duplex. Anything else will be handled
 518                  * as usual.
 519                  */
 520                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
 521                         if (dsp_cdevs[i].volctl != 0 &&
 522                             DSP_F_READ(flags)) {
 523                                 volctl = DSP_CDEV_VOLCTL_WRITE;
 524                                 flags &= ~FREAD;
 525                                 flags |= FWRITE;
 526                         }
 527                         if (DSP_F_READ(flags)) {
 528                                 (void)snd_clone_release(i_dev);
 529                                 PCM_RELEASE_QUICK(d);
 530                                 PCM_GIANT_EXIT(d);
 531                                 return (ENOTSUP);
 532                         }
 533                         wdevunit = dev2unit(i_dev);
 534                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
 535                         if (dsp_cdevs[i].volctl != 0 &&
 536                             DSP_F_WRITE(flags)) {
 537                                 volctl = DSP_CDEV_VOLCTL_READ;
 538                                 flags &= ~FWRITE;
 539                                 flags |= FREAD;
 540                         }
 541                         if (DSP_F_WRITE(flags)) {
 542                                 (void)snd_clone_release(i_dev);
 543                                 PCM_RELEASE_QUICK(d);
 544                                 PCM_GIANT_EXIT(d);
 545                                 return (ENOTSUP);
 546                         }
 547                         rdevunit = dev2unit(i_dev);
 548                 }
 549                 fmt = dsp_cdevs[i].fmt;
 550                 spd = dsp_cdevs[i].spd;
 551                 break;
 552         }
 553
 554         rdch = NULL;
 555         wrch = NULL;
 556         rderror = 0;
 557         wrerror = 0;
 558
 559         /*
 560          * if we get here, the open request is valid- either:
 561          *   * we were previously not open
 562          *   * we were open for play xor record and the opener wants
 563          *     the non-open direction
 564          */
 565         if (DSP_F_READ(flags)) {
 566                 /* open for read */
 567                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
 568                     curproc->p_pid, curproc->p_comm, rdevunit);
 569
 570                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
 571                         rderror = ENXIO;
 572
 573                 if (volctl == DSP_CDEV_VOLCTL_READ)
 574                         rderror = 0;
 575
 576                 if (rderror != 0) {
 577                         if (rdch != NULL)
 578                                 pcm_chnrelease(rdch);
 579                         if (!DSP_F_DUPLEX(flags)) {
 580                                 (void)snd_clone_release(i_dev);
 581                                 PCM_RELEASE_QUICK(d);
 582                                 PCM_GIANT_EXIT(d);
 583                                 return (rderror);
 584                         }
 585                         rdch = NULL;
 586                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
 587                         if (rdch != NULL) {
 588                                 pcm_chnref(rdch, 1);
 589                                 pcm_chnrelease(rdch);
 590                         }
 591                 } else {
 592                         if (flags & O_EXCL)
 593                                 rdch->flags |= CHN_F_EXCLUSIVE;
 594                         pcm_chnref(rdch, 1);
 595                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 596                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
 597                         CHN_UNLOCK(rdch);
 598                 }
 599         }
 600
 601         if (DSP_F_WRITE(flags)) {
 602                 /* open for write */
 603                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
 604                     curproc->p_pid, curproc->p_comm, wdevunit);
 605
 606                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
 607                         wrerror = ENXIO;
 608
 609                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
 610                         wrerror = 0;
 611
 612                 if (wrerror != 0) {
 613                         if (wrch != NULL)
 614                                 pcm_chnrelease(wrch);
 615                         if (!DSP_F_DUPLEX(flags)) {
 616                                 if (rdch != NULL) {
 617                                         /*
 618                                          * Lock, deref and release previously
 619                                          * created record channel
 620                                          */
 621                                         CHN_LOCK(rdch);
 622                                         pcm_chnref(rdch, -1);
 623                                         pcm_chnrelease(rdch);
 624                                 }
 625                                 (void)snd_clone_release(i_dev);
 626                                 PCM_RELEASE_QUICK(d);
 627                                 PCM_GIANT_EXIT(d);
 628                                 return (wrerror);
 629                         }
 630                         wrch = NULL;
 631                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
 632                         if (wrch != NULL) {
 633                                 pcm_chnref(wrch, 1);
 634                                 pcm_chnrelease(wrch);
 635                         }
 636                 } else {
 637                         if (flags & O_EXCL)
 638                                 wrch->flags |= CHN_F_EXCLUSIVE;
 639                         pcm_chnref(wrch, 1);
 640                         if (volctl == DSP_CDEV_VOLCTL_NONE)
 641                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
 642                         CHN_UNLOCK(wrch);
 643                 }
 644         }
 645
 646
 647         PCM_LOCK(d);
 648
 649         /*
 650          * We're done. Allocate channels information for this cdev.
 651          */
 652         switch (volctl) {
 653         case DSP_CDEV_VOLCTL_READ:
 654                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
 655                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
 656                 break;
 657         case DSP_CDEV_VOLCTL_WRITE:
 658                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
 659                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
 660                 break;
 661         case DSP_CDEV_VOLCTL_NONE:
 662         default:
 663                 if (wrch == NULL && rdch == NULL) {
 664                         (void)snd_clone_release(i_dev);
 665                         PCM_RELEASE(d);
 666                         PCM_UNLOCK(d);
 667                         PCM_GIANT_EXIT(d);
 668                         if (wrerror != 0)
 669                                 return (wrerror);
 670                         if (rderror != 0)
 671                                 return (rderror);
 672                         return (EINVAL);
 673                 }
 674                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
 675                 if (rdch != NULL)
 676                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
 677                 if (wrch != NULL)
 678                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
 679                 break;
 680         }
 681
 682         /*
 683          * Increase clone refcount for its automatic garbage collector.
 684          */
 685         (void)snd_clone_ref(i_dev);
 686
 687         PCM_RELEASE(d);
 688         PCM_UNLOCK(d);
 689
 690         PCM_GIANT_LEAVE(d);
 691
 692         return (0);
 693 }
 694
 695 static int
 696 dsp_close(struct dev_close_args *ap)
 697 {
 698         struct cdev *i_dev = ap->a_head.a_dev;
 699         struct pcm_channel *rdch, *wrch, *volch;
 700         struct snddev_info *d;
 701         int sg_ids, rdref, wdref;
 702         int subunit;
 703
 704         /*
 705          * subunit is a unique number for the cloned device, it
 706          * does NOT represent the virtual device channel.
 707          */
 708         subunit = PCMSUBUNIT(i_dev);
 709
 710         d = dsp_get_info(i_dev);
 711         if (!DSP_REGISTERED(d, i_dev))
 712                 return (EBADF);
 713
 714         PCM_GIANT_ENTER(d);
 715
 716         PCM_LOCK(d);
 717         PCM_WAIT(d);
 718         PCM_ACQUIRE(d);
 719
 720         rdch = PCM_RDCH(i_dev);
 721         wrch = PCM_WRCH(i_dev);
 722         volch = PCM_VOLCH(i_dev);
 723
 724         PCM_RDCH(i_dev) = NULL;
 725         PCM_WRCH(i_dev) = NULL;
 726         PCM_VOLCH(i_dev) = NULL;
 727
 728         rdref = -1;
 729         wdref = -1;
 730
 731         if (volch != NULL) {
 732                 if (volch == rdch)
 733                         rdref--;
 734                 else if (volch == wrch)
 735                         wdref--;
 736                 else {
 737                         CHN_LOCK(volch);
 738                         pcm_chnref(volch, -1);
 739                         CHN_UNLOCK(volch);
 740                 }
 741         }
 742
 743         if (rdch != NULL)
 744                 CHN_REMOVE(d, rdch, channels.pcm.opened);
 745         if (wrch != NULL)
 746                 CHN_REMOVE(d, wrch, channels.pcm.opened);
 747
 748         if (rdch != NULL || wrch != NULL) {
 749                 PCM_UNLOCK(d);
 750                 if (rdch != NULL) {
 751                         /*
 752                          * The channel itself need not be locked because:
 753                          *   a)  Adding a channel to a syncgroup happens only
 754                          *       in dsp_ioctl(), which cannot run concurrently
 755                          *       to dsp_close().
 756                          *   b)  The syncmember pointer (sm) is protected by
 757                          *       the global syncgroup list lock.
 758                          *   c)  A channel can't just disappear, invalidating
 759                          *       pointers, unless it's closed/dereferenced
 760                          *       first.
 761                          */
 762                         PCM_SG_LOCK();
 763                         sg_ids = chn_syncdestroy(rdch);
 764                         PCM_SG_UNLOCK();
 765                         if (sg_ids != 0)
 766                                 free_unr(pcmsg_unrhdr, sg_ids);
 767
 768                         CHN_LOCK(rdch);
 769                         pcm_chnref(rdch, rdref);
 770                         chn_abort(rdch); /* won't sleep */
 771                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 772                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 773                         chn_reset(rdch, 0, 0);
 774                         pcm_chnrelease(rdch);
 775                 }
 776                 if (wrch != NULL) {
 777                         /*
 778                          * Please see block above.
 779                          */
 780                         PCM_SG_LOCK();
 781                         sg_ids = chn_syncdestroy(wrch);
 782                         PCM_SG_UNLOCK();
 783                         if (sg_ids != 0)
 784                                 free_unr(pcmsg_unrhdr, sg_ids);
 785
 786                         CHN_LOCK(wrch);
 787                         pcm_chnref(wrch, wdref);
 788                         chn_flush(wrch); /* may sleep */
 789                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
 790                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
 791                         chn_reset(wrch, 0, 0);
 792                         pcm_chnrelease(wrch);
 793                 }
 794                 PCM_LOCK(d);
 795         }
 796
 797         dsp_cdevinfo_free(i_dev);
 798         /*
 799          * Release clone busy state and unref it so the automatic
 800          * garbage collector will get the hint and do the remaining
 801          * cleanup process.
 802          */
 803         (void)snd_clone_release(i_dev);
 804
 805         /*
 806          * destroy_dev() might sleep, so release pcm lock
 807          * here and rely on pcm cv serialization.
 808          */
 809         PCM_UNLOCK(d);
 810         (void)snd_clone_unref(i_dev);
 811         PCM_LOCK(d);
 812
 813         PCM_RELEASE(d);
 814         PCM_UNLOCK(d);
 815
 816         PCM_GIANT_LEAVE(d);
 817
 818         /*
 819          * PCMCHAN(i_dev) is not the actual channel but instead is
 820          * simply the unique subunit we assigned to the clone device.
 821          *
 822          * We do not do this here but instead do it when the clone is
 823          * GCd.
 824          */
 825         /*
 826         devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(dsp), subunit);
 827         */
 828
 829         return (0);
 830 }
 831
 832 static __inline int
 833 dsp_io_ops(struct cdev *i_dev, struct uio *buf, int ioflags)
 834 {
 835         struct snddev_info *d;
 836         struct pcm_channel **ch, *rdch, *wrch;
 837         int (*chn_io)(struct pcm_channel *, struct uio *, int);
 838         int prio, ret;
 839         pid_t runpid;
 840
 841         KASSERT(i_dev != NULL && buf != NULL &&
 842             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
 843             ("%s(): io train wreck!", __func__));
 844
 845         d = dsp_get_info(i_dev);
 846         if (!DSP_REGISTERED(d, i_dev))
 847                 return (EBADF);
 848
 849         PCM_GIANT_ENTER(d);
 850
 851         switch (buf->uio_rw) {
 852         case UIO_READ:
 853                 prio = SD_F_PRIO_RD;
 854                 ch = &rdch;
 855                 chn_io = chn_read;
 856                 break;
 857         case UIO_WRITE:
 858                 prio = SD_F_PRIO_WR;
 859                 ch = &wrch;
 860                 chn_io = chn_write;
 861                 break;
 862         default:
 863                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
 864                 break;
 865         }
 866
 867         rdch = NULL;
 868         wrch = NULL;
 869         runpid = buf->uio_td->td_proc->p_pid;
 870
 871         getchns(i_dev, &rdch, &wrch, prio);
 872
 873         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
 874                 PCM_GIANT_EXIT(d);
 875                 return (EBADF);
 876         }
 877
 878         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
 879             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
 880                 relchns(i_dev, rdch, wrch, prio);
 881                 PCM_GIANT_EXIT(d);
 882                 return (EINVAL);
 883         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
 884                 (*ch)->flags |= CHN_F_RUNNING;
 885                 (*ch)->pid = runpid;
 886         }
 887
 888         /*
 889          * chn_read/write must give up channel lock in order to copy bytes
 890          * from/to userland, so up the "in progress" counter to make sure
 891          * someone else doesn't come along and muss up the buffer.
 892          */
 893         ++(*ch)->inprog;
 894         ret = chn_io(*ch, buf, ioflags);
 895         --(*ch)->inprog;
 896
 897         CHN_BROADCAST(&(*ch)->cv);
 898
 899         relchns(i_dev, rdch, wrch, prio);
 900
 901         PCM_GIANT_LEAVE(d);
 902
 903         return (ret);
 904 }
 905
 906 static int
 907 dsp_read(struct dev_read_args *ap)
 908 {
 909         struct cdev *i_dev = ap->a_head.a_dev;
 910         struct uio *buf = ap->a_uio;
 911
 912         return (dsp_io_ops(i_dev, buf, ap->a_ioflag));
 913 }
 914
 915 static int
 916 dsp_write(struct dev_write_args *ap)
 917 {
 918         struct cdev *i_dev = ap->a_head.a_dev;
 919         struct uio *buf = ap->a_uio;
 920
 921         return (dsp_io_ops(i_dev, buf, ap->a_ioflag));
 922 }
 923
 924 static int
 925 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
 926 {
 927         struct snddev_info *d;
 928         struct pcm_channel *c;
 929         int unit;
 930
 931         KASSERT(dev != NULL && volch != NULL,
 932             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
 933
 934         d = dsp_get_info(dev);
 935         if (!PCM_REGISTERED(d)) {
 936                 *volch = NULL;
 937                 return (EINVAL);
 938         }
 939
 940         PCM_UNLOCKASSERT(d);
 941
 942         *volch = NULL;
 943
 944         c = PCM_VOLCH(dev);
 945         if (c != NULL) {
 946                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
 947                         return (-1);
 948                 *volch = c;
 949                 return (0);
 950         }
 951
 952         PCM_LOCK(d);
 953         PCM_WAIT(d);
 954         PCM_ACQUIRE(d);
 955
 956         unit = dev2unit(dev);
 957
 958         CHN_FOREACH(c, d, channels.pcm) {
 959                 CHN_LOCK(c);
 960                 if (c->unit != unit) {
 961                         CHN_UNLOCK(c);
 962                         continue;
 963                 }
 964                 *volch = c;
 965                 pcm_chnref(c, 1);
 966                 PCM_VOLCH(dev) = c;
 967                 CHN_UNLOCK(c);
 968                 PCM_RELEASE(d);
 969                 PCM_UNLOCK(d);
 970                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
 971         }
 972
 973         PCM_RELEASE(d);
 974         PCM_UNLOCK(d);
 975
 976         return (EINVAL);
 977 }
 978
 979 static int
 980 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
 981     caddr_t arg)
 982 {
 983         struct snddev_info *d;
 984         struct pcm_channel *rdch, *wrch;
 985         int j, devtype, ret;
 986
 987         d = dsp_get_info(dev);
 988         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
 989                 return (-1);
 990
 991         PCM_UNLOCKASSERT(d);
 992
 993         j = cmd & 0xff;
 994
 995         rdch = PCM_RDCH(dev);
 996         wrch = PCM_WRCH(dev);
 997
 998         /* No specific channel, look into cache */
 999         if (volch == NULL)
1000                 volch = PCM_VOLCH(dev);
1001
1002         /* Look harder */
1003         if (volch == NULL) {
1004                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
1005                         volch = rdch;
1006                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
1007                         volch = wrch;
1008         }
1009
1010         devtype = PCMDEV(dev);
1011
1012         /* Look super harder */
1013         if (volch == NULL &&
1014             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
1015             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
1016                 ret = dsp_get_volume_channel(dev, &volch);
1017                 if (ret != 0)
1018                         return (ret);
1019                 if (volch == NULL)
1020                         return (EINVAL);
1021         }
1022
1023         /* Final validation */
1024         if (volch != NULL) {
1025                 CHN_LOCK(volch);
1026                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
1027                         CHN_UNLOCK(volch);
1028                         return (-1);
1029                 }
1030                 if (volch->direction == PCMDIR_PLAY)
1031                         wrch = volch;
1032                 else
1033                         rdch = volch;
1034         }
1035
1036         ret = EINVAL;
1037
1038         if (volch != NULL &&
1039             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
1040             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
1041                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
1042                         int left, right, center;
1043
1044                         left = *(int *)arg & 0x7f;
1045                         right = ((*(int *)arg) >> 8) & 0x7f;
1046                         center = (left + right) >> 1;
1047                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
1048                             center);
1049                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
1050                         *(int *)arg = CHN_GETVOLUME(volch,
1051                                 SND_VOL_C_PCM, SND_CHN_T_FL);
1052                         *(int *)arg |= CHN_GETVOLUME(volch,
1053                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
1054                 }
1055                 ret = 0;
1056         } else if (rdch != NULL || wrch != NULL) {
1057                 switch (j) {
1058                 case SOUND_MIXER_DEVMASK:
1059                 case SOUND_MIXER_CAPS:
1060                 case SOUND_MIXER_STEREODEVS:
1061                         if ((cmd & ~0xff) == MIXER_READ(0)) {
1062                                 *(int *)arg = 0;
1063                                 if (rdch != NULL)
1064                                         *(int *)arg |= SOUND_MASK_RECLEV;
1065                                 if (wrch != NULL)
1066                                         *(int *)arg |= SOUND_MASK_PCM;
1067                         }
1068                         ret = 0;
1069                         break;
1070                 case SOUND_MIXER_RECMASK:
1071                 case SOUND_MIXER_RECSRC:
1072                         if ((cmd & ~0xff) == MIXER_READ(0))
1073                                 *(int *)arg = 0;
1074                         ret = 0;
1075                         break;
1076                 default:
1077                         break;
1078                 }
1079         }
1080
1081         if (volch != NULL)
1082                 CHN_UNLOCK(volch);
1083
1084         return (ret);
1085 }
1086
1087 static int
1088 dsp_ioctl(struct dev_ioctl_args *ap)
1089 {
1090         struct cdev *i_dev = ap->a_head.a_dev;
1091         u_long cmd = ap->a_cmd;
1092         caddr_t arg = ap->a_data;
1093         struct pcm_channel *chn, *rdch, *wrch;
1094         struct snddev_info *d;
1095         u_long xcmd;
1096         int *arg_i, ret, tmp;
1097
1098         d = dsp_get_info(i_dev);
1099         if (!DSP_REGISTERED(d, i_dev))
1100                 return (EBADF);
1101
1102         PCM_GIANT_ENTER(d);
1103
1104         arg_i = (int *)arg;
1105         ret = 0;
1106         xcmd = 0;
1107         chn = NULL;
1108
1109         if (IOCGROUP(cmd) == 'M') {
1110                 if (cmd == OSS_GETVERSION) {
1111                         *arg_i = SOUND_VERSION;
1112                         PCM_GIANT_EXIT(d);
1113                         return (0);
1114                 }
1115                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
1116                 if (ret != -1) {
1117                         PCM_GIANT_EXIT(d);
1118                         return (ret);
1119                 }
1120
1121                 if (d->mixer_dev != NULL) {
1122                         PCM_ACQUIRE_QUICK(d);
1123                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1,
1124                             MIXER_CMD_DIRECT);
1125                         PCM_RELEASE_QUICK(d);
1126                 } else
1127                         ret = EBADF;
1128
1129                 PCM_GIANT_EXIT(d);
1130
1131                 return (ret);
1132         }
1133
1134         /*
1135          * Certain ioctls may be made on any type of device (audio, mixer,
1136          * and MIDI).  Handle those special cases here.
1137          */
1138         if (IOCGROUP(cmd) == 'X') {
1139                 PCM_ACQUIRE_QUICK(d);
1140                 switch(cmd) {
1141                 case SNDCTL_SYSINFO:
1142                         sound_oss_sysinfo((oss_sysinfo *)arg);
1143                         break;
1144                 case SNDCTL_CARDINFO:
1145                         ret = sound_oss_card_info((oss_card_info *)arg);
1146                         break;
1147                 case SNDCTL_AUDIOINFO:
1148                 case SNDCTL_AUDIOINFO_EX:
1149                 case SNDCTL_ENGINEINFO:
1150                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
1151                         break;
1152                 case SNDCTL_MIXERINFO:
1153                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
1154                         break;
1155                 default:
1156                         ret = EINVAL;
1157                 }
1158                 PCM_RELEASE_QUICK(d);
1159                 PCM_GIANT_EXIT(d);
1160                 return (ret);
1161         }
1162
1163         getchns(i_dev, &rdch, &wrch, 0);
1164
1165         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
1166                 wrch = NULL;
1167         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
1168                 rdch = NULL;
1169
1170         if (wrch == NULL && rdch == NULL) {
1171                 PCM_GIANT_EXIT(d);
1172                 return (EINVAL);
1173         }
1174
1175         switch(cmd) {
1176 #ifdef OLDPCM_IOCTL
1177         /*
1178          * we start with the new ioctl interface.
1179          */
1180         case AIONWRITE: /* how many bytes can write ? */
1181                 if (wrch) {
1182                         CHN_LOCK(wrch);
1183 /*
1184                 if (wrch && wrch->bufhard.dl)
1185                         while (chn_wrfeed(wrch) == 0);
1186 */
1187                         *arg_i = sndbuf_getfree(wrch->bufsoft);
1188                         CHN_UNLOCK(wrch);
1189                 } else {
1190                         *arg_i = 0;
1191                         ret = EINVAL;
1192                 }
1193                 break;
1194
1195         case AIOSSIZE:     /* set the current blocksize */
1196                 {
1197                         struct snd_size *p = (struct snd_size *)arg;
1198
1199                         p->play_size = 0;
1200                         p->rec_size = 0;
1201                         PCM_ACQUIRE_QUICK(d);
1202                         if (wrch) {
1203                                 CHN_LOCK(wrch);
1204                                 chn_setblocksize(wrch, 2, p->play_size);
1205                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1206                                 CHN_UNLOCK(wrch);
1207                         }
1208                         if (rdch) {
1209                                 CHN_LOCK(rdch);
1210                                 chn_setblocksize(rdch, 2, p->rec_size);
1211                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1212                                 CHN_UNLOCK(rdch);
1213                         }
1214                         PCM_RELEASE_QUICK(d);
1215                 }
1216                 break;
1217         case AIOGSIZE:  /* get the current blocksize */
1218                 {
1219                         struct snd_size *p = (struct snd_size *)arg;
1220
1221                         if (wrch) {
1222                                 CHN_LOCK(wrch);
1223                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
1224                                 CHN_UNLOCK(wrch);
1225                         }
1226                         if (rdch) {
1227                                 CHN_LOCK(rdch);
1228                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
1229                                 CHN_UNLOCK(rdch);
1230                         }
1231                 }
1232                 break;
1233
1234         case AIOSFMT:
1235         case AIOGFMT:
1236                 {
1237                         snd_chan_param *p = (snd_chan_param *)arg;
1238
1239                         if (cmd == AIOSFMT &&
1240                             ((p->play_format != 0 && p->play_rate == 0) ||
1241                             (p->rec_format != 0 && p->rec_rate == 0))) {
1242                                 ret = EINVAL;
1243                                 break;
1244                         }
1245                         PCM_ACQUIRE_QUICK(d);
1246                         if (wrch) {
1247                                 CHN_LOCK(wrch);
1248                                 if (cmd == AIOSFMT && p->play_format != 0) {
1249                                         chn_setformat(wrch,
1250                                             SND_FORMAT(p->play_format,
1251                                             AFMT_CHANNEL(wrch->format),
1252                                             AFMT_EXTCHANNEL(wrch->format)));
1253                                         chn_setspeed(wrch, p->play_rate);
1254                                 }
1255                                 p->play_rate = wrch->speed;
1256                                 p->play_format = AFMT_ENCODING(wrch->format);
1257                                 CHN_UNLOCK(wrch);
1258                         } else {
1259                                 p->play_rate = 0;
1260                                 p->play_format = 0;
1261                         }
1262                         if (rdch) {
1263                                 CHN_LOCK(rdch);
1264                                 if (cmd == AIOSFMT && p->rec_format != 0) {
1265                                         chn_setformat(rdch,
1266                                             SND_FORMAT(p->rec_format,
1267                                             AFMT_CHANNEL(rdch->format),
1268                                             AFMT_EXTCHANNEL(rdch->format)));
1269                                         chn_setspeed(rdch, p->rec_rate);
1270                                 }
1271                                 p->rec_rate = rdch->speed;
1272                                 p->rec_format = AFMT_ENCODING(rdch->format);
1273                                 CHN_UNLOCK(rdch);
1274                         } else {
1275                                 p->rec_rate = 0;
1276                                 p->rec_format = 0;
1277                         }
1278                         PCM_RELEASE_QUICK(d);
1279                 }
1280                 break;
1281
1282         case AIOGCAP:     /* get capabilities */
1283                 {
1284                         snd_capabilities *p = (snd_capabilities *)arg;
1285                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
1286                         struct cdev *pdev;
1287
1288                         PCM_LOCK(d);
1289                         if (rdch) {
1290                                 CHN_LOCK(rdch);
1291                                 rcaps = chn_getcaps(rdch);
1292                         }
1293                         if (wrch) {
1294                                 CHN_LOCK(wrch);
1295                                 pcaps = chn_getcaps(wrch);
1296                         }
1297                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
1298                                           pcaps? pcaps->minspeed : 0);
1299                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
1300                                           pcaps? pcaps->maxspeed : 1000000);
1301                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
1302                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
1303                         /* XXX bad on sb16 */
1304                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
1305                                      (wrch? chn_getformats(wrch) : 0xffffffff);
1306                         if (rdch && wrch)
1307                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
1308                         pdev = d->mixer_dev;
1309                         p->mixers = 1; /* default: one mixer */
1310                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
1311                         p->left = p->right = 100;
1312                         if (wrch)
1313                                 CHN_UNLOCK(wrch);
1314                         if (rdch)
1315                                 CHN_UNLOCK(rdch);
1316                         PCM_UNLOCK(d);
1317                 }
1318                 break;
1319
1320         case AIOSTOP:
1321                 if (*arg_i == AIOSYNC_PLAY && wrch) {
1322                         CHN_LOCK(wrch);
1323                         *arg_i = chn_abort(wrch);
1324                         CHN_UNLOCK(wrch);
1325                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
1326                         CHN_LOCK(rdch);
1327                         *arg_i = chn_abort(rdch);
1328                         CHN_UNLOCK(rdch);
1329                 } else {
1330                         kprintf("AIOSTOP: bad channel 0x%x\n", *arg_i);
1331                         *arg_i = 0;
1332                 }
1333                 break;
1334
1335         case AIOSYNC:
1336                 kprintf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
1337                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
1338                 break;
1339 #endif
1340         /*
1341          * here follow the standard ioctls (filio.h etc.)
1342          */
1343         case FIONREAD: /* get # bytes to read */
1344                 if (rdch) {
1345                         CHN_LOCK(rdch);
1346 /*                      if (rdch && rdch->bufhard.dl)
1347                                 while (chn_rdfeed(rdch) == 0);
1348 */
1349                         *arg_i = sndbuf_getready(rdch->bufsoft);
1350                         CHN_UNLOCK(rdch);
1351                 } else {
1352                         *arg_i = 0;
1353                         ret = EINVAL;
1354                 }
1355                 break;
1356
1357         case FIOASYNC: /*set/clear async i/o */
1358                 DEB( kprintf("FIOASYNC\n") ; )
1359                 break;
1360
1361         case FIONBIO: /* set/clear non-blocking i/o */
1362                 DEB( kprintf("FIONBIO\n") ; )
1363                 break;
1364
1365         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
1366                 atomic_set_int(&ap->a_fp->f_flag, FNONBLOCK);
1367                 break;
1368
1369         /*
1370          * Finally, here is the linux-compatible ioctl interface
1371          */
1372 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
1373         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
1374         case SNDCTL_DSP_GETBLKSIZE:
1375                 chn = wrch ? wrch : rdch;
1376                 if (chn) {
1377                         CHN_LOCK(chn);
1378                         *arg_i = sndbuf_getblksz(chn->bufsoft);
1379                         CHN_UNLOCK(chn);
1380                 } else {
1381                         *arg_i = 0;
1382                         ret = EINVAL;
1383                 }
1384                 break;
1385
1386         case SNDCTL_DSP_SETBLKSIZE:
1387                 RANGE(*arg_i, 16, 65536);
1388                 PCM_ACQUIRE_QUICK(d);
1389                 if (wrch) {
1390                         CHN_LOCK(wrch);
1391                         chn_setblocksize(wrch, 2, *arg_i);
1392                         CHN_UNLOCK(wrch);
1393                 }
1394                 if (rdch) {
1395                         CHN_LOCK(rdch);
1396                         chn_setblocksize(rdch, 2, *arg_i);
1397                         CHN_UNLOCK(rdch);
1398                 }
1399                 PCM_RELEASE_QUICK(d);
1400                 break;
1401
1402         case SNDCTL_DSP_RESET:
1403                 DEB(kprintf("dsp reset\n"));
1404                 if (wrch) {
1405                         CHN_LOCK(wrch);
1406                         chn_abort(wrch);
1407                         chn_resetbuf(wrch);
1408                         CHN_UNLOCK(wrch);
1409                 }
1410                 if (rdch) {
1411                         CHN_LOCK(rdch);
1412                         chn_abort(rdch);
1413                         chn_resetbuf(rdch);
1414                         CHN_UNLOCK(rdch);
1415                 }
1416                 break;
1417
1418         case SNDCTL_DSP_SYNC:
1419                 DEB(kprintf("dsp sync\n"));
1420                 /* chn_sync may sleep */
1421                 if (wrch) {
1422                         CHN_LOCK(wrch);
1423                         chn_sync(wrch, 0);
1424                         CHN_UNLOCK(wrch);
1425                 }
1426                 break;
1427
1428         case SNDCTL_DSP_SPEED:
1429                 /* chn_setspeed may sleep */
1430                 tmp = 0;
1431                 PCM_ACQUIRE_QUICK(d);
1432                 if (wrch) {
1433                         CHN_LOCK(wrch);
1434                         ret = chn_setspeed(wrch, *arg_i);
1435                         tmp = wrch->speed;
1436                         CHN_UNLOCK(wrch);
1437                 }
1438                 if (rdch && ret == 0) {
1439                         CHN_LOCK(rdch);
1440                         ret = chn_setspeed(rdch, *arg_i);
1441                         if (tmp == 0)
1442                                 tmp = rdch->speed;
1443                         CHN_UNLOCK(rdch);
1444                 }
1445                 PCM_RELEASE_QUICK(d);
1446                 *arg_i = tmp;
1447                 break;
1448
1449         case SOUND_PCM_READ_RATE:
1450                 chn = wrch ? wrch : rdch;
1451                 if (chn) {
1452                         CHN_LOCK(chn);
1453                         *arg_i = chn->speed;
1454                         CHN_UNLOCK(chn);
1455                 } else {
1456                         *arg_i = 0;
1457                         ret = EINVAL;
1458                 }
1459                 break;
1460
1461         case SNDCTL_DSP_STEREO:
1462                 tmp = -1;
1463                 *arg_i = (*arg_i)? 2 : 1;
1464                 PCM_ACQUIRE_QUICK(d);
1465                 if (wrch) {
1466                         CHN_LOCK(wrch);
1467                         ret = chn_setformat(wrch,
1468                             SND_FORMAT(wrch->format, *arg_i, 0));
1469                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
1470                         CHN_UNLOCK(wrch);
1471                 }
1472                 if (rdch && ret == 0) {
1473                         CHN_LOCK(rdch);
1474                         ret = chn_setformat(rdch,
1475                             SND_FORMAT(rdch->format, *arg_i, 0));
1476                         if (tmp == -1)
1477                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
1478                         CHN_UNLOCK(rdch);
1479                 }
1480                 PCM_RELEASE_QUICK(d);
1481                 *arg_i = tmp;
1482                 break;
1483
1484         case SOUND_PCM_WRITE_CHANNELS:
1485 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
1486                 if (*arg_i < 0) {
1487                         *arg_i = 0;
1488                         ret = EINVAL;
1489                         break;
1490                 }
1491                 if (*arg_i != 0) {
1492                         struct pcmchan_matrix *m;
1493                         uint32_t ext;
1494
1495                         tmp = 0;
1496                         if (*arg_i > SND_CHN_MAX)
1497                                 *arg_i = SND_CHN_MAX;
1498
1499                         m = feeder_matrix_default_channel_map(*arg_i);
1500                         if (m != NULL)
1501                                 ext = m->ext;
1502                         else
1503                                 ext = 0;
1504
1505                         PCM_ACQUIRE_QUICK(d);
1506                         if (wrch) {
1507                                 CHN_LOCK(wrch);
1508                                 ret = chn_setformat(wrch,
1509                                     SND_FORMAT(wrch->format, *arg_i, ext));
1510                                 tmp = AFMT_CHANNEL(wrch->format);
1511                                 CHN_UNLOCK(wrch);
1512                         }
1513                         if (rdch && ret == 0) {
1514                                 CHN_LOCK(rdch);
1515                                 ret = chn_setformat(rdch,
1516                                     SND_FORMAT(rdch->format, *arg_i, ext));
1517                                 if (tmp == 0)
1518                                         tmp = AFMT_CHANNEL(rdch->format);
1519                                 CHN_UNLOCK(rdch);
1520                         }
1521                         PCM_RELEASE_QUICK(d);
1522                         *arg_i = tmp;
1523                 } else {
1524                         chn = wrch ? wrch : rdch;
1525                         CHN_LOCK(chn);
1526                         *arg_i = AFMT_CHANNEL(chn->format);
1527                         CHN_UNLOCK(chn);
1528                 }
1529                 break;
1530
1531         case SOUND_PCM_READ_CHANNELS:
1532                 chn = wrch ? wrch : rdch;
1533                 if (chn) {
1534                         CHN_LOCK(chn);
1535                         *arg_i = AFMT_CHANNEL(chn->format);
1536                         CHN_UNLOCK(chn);
1537                 } else {
1538                         *arg_i = 0;
1539                         ret = EINVAL;
1540                 }
1541                 break;
1542
1543         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
1544                 chn = wrch ? wrch : rdch;
1545                 if (chn) {
1546                         CHN_LOCK(chn);
1547                         *arg_i = chn_getformats(chn);
1548                         CHN_UNLOCK(chn);
1549                 } else {
1550                         *arg_i = 0;
1551                         ret = EINVAL;
1552                 }
1553                 break;
1554
1555         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
1556                 if (*arg_i != AFMT_QUERY) {
1557                         tmp = 0;
1558                         PCM_ACQUIRE_QUICK(d);
1559                         if (wrch) {
1560                                 CHN_LOCK(wrch);
1561                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
1562                                     AFMT_CHANNEL(wrch->format),
1563                                     AFMT_EXTCHANNEL(wrch->format)));
1564                                 tmp = wrch->format;
1565                                 CHN_UNLOCK(wrch);
1566                         }
1567                         if (rdch && ret == 0) {
1568                                 CHN_LOCK(rdch);
1569                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
1570                                     AFMT_CHANNEL(rdch->format),
1571                                     AFMT_EXTCHANNEL(rdch->format)));
1572                                 if (tmp == 0)
1573                                         tmp = rdch->format;
1574                                 CHN_UNLOCK(rdch);
1575                         }
1576                         PCM_RELEASE_QUICK(d);
1577                         *arg_i = AFMT_ENCODING(tmp);
1578                 } else {
1579                         chn = wrch ? wrch : rdch;
1580                         CHN_LOCK(chn);
1581                         *arg_i = AFMT_ENCODING(chn->format);
1582                         CHN_UNLOCK(chn);
1583                 }
1584                 break;
1585
1586         case SNDCTL_DSP_SETFRAGMENT:
1587                 DEB(kprintf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
1588                 {
1589                         uint32_t fragln = (*arg_i) & 0x0000ffff;
1590                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
1591                         uint32_t fragsz;
1592                         uint32_t r_maxfrags, r_fragsz;
1593
1594                         RANGE(fragln, 4, 16);
1595                         fragsz = 1 << fragln;
1596
1597                         if (maxfrags == 0)
1598                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1599                         if (maxfrags < 2)
1600                                 maxfrags = 2;
1601                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
1602                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
1603
1604                         DEB(kprintf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
1605                         PCM_ACQUIRE_QUICK(d);
1606                         if (rdch) {
1607                                 CHN_LOCK(rdch);
1608                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
1609                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
1610                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
1611                                 CHN_UNLOCK(rdch);
1612                         } else {
1613                                 r_maxfrags = maxfrags;
1614                                 r_fragsz = fragsz;
1615                         }
1616                         if (wrch && ret == 0) {
1617                                 CHN_LOCK(wrch);
1618                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
1619                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
1620                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
1621                                 CHN_UNLOCK(wrch);
1622                         } else { /* use whatever came from the read channel */
1623                                 maxfrags = r_maxfrags;
1624                                 fragsz = r_fragsz;
1625                         }
1626                         PCM_RELEASE_QUICK(d);
1627
1628                         fragln = 0;
1629                         while (fragsz > 1) {
1630                                 fragln++;
1631                                 fragsz >>= 1;
1632                         }
1633                         *arg_i = (maxfrags << 16) | fragln;
1634                 }
1635                 break;
1636
1637         case SNDCTL_DSP_GETISPACE:
1638                 /* return the size of data available in the input queue */
1639                 {
1640                         audio_buf_info *a = (audio_buf_info *)arg;
1641                         if (rdch) {
1642                                 struct snd_dbuf *bs = rdch->bufsoft;
1643
1644                                 CHN_LOCK(rdch);
1645                                 a->bytes = sndbuf_getready(bs);
1646                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1647                                 a->fragstotal = sndbuf_getblkcnt(bs);
1648                                 a->fragsize = sndbuf_getblksz(bs);
1649                                 CHN_UNLOCK(rdch);
1650                         } else
1651                                 ret = EINVAL;
1652                 }
1653                 break;
1654
1655         case SNDCTL_DSP_GETOSPACE:
1656                 /* return space available in the output queue */
1657                 {
1658                         audio_buf_info *a = (audio_buf_info *)arg;
1659                         if (wrch) {
1660                                 struct snd_dbuf *bs = wrch->bufsoft;
1661
1662                                 CHN_LOCK(wrch);
1663                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1664                                 a->bytes = sndbuf_getfree(bs);
1665                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
1666                                 a->fragstotal = sndbuf_getblkcnt(bs);
1667                                 a->fragsize = sndbuf_getblksz(bs);
1668                                 CHN_UNLOCK(wrch);
1669                         } else
1670                                 ret = EINVAL;
1671                 }
1672                 break;
1673
1674         case SNDCTL_DSP_GETIPTR:
1675                 {
1676                         count_info *a = (count_info *)arg;
1677                         if (rdch) {
1678                                 struct snd_dbuf *bs = rdch->bufsoft;
1679
1680                                 CHN_LOCK(rdch);
1681                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
1682                                 a->bytes = sndbuf_gettotal(bs);
1683                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
1684                                 a->ptr = sndbuf_getfreeptr(bs);
1685                                 rdch->blocks = sndbuf_getblocks(bs);
1686                                 CHN_UNLOCK(rdch);
1687                         } else
1688                                 ret = EINVAL;
1689                 }
1690                 break;
1691
1692         case SNDCTL_DSP_GETOPTR:
1693                 {
1694                         count_info *a = (count_info *)arg;
1695                         if (wrch) {
1696                                 struct snd_dbuf *bs = wrch->bufsoft;
1697
1698                                 CHN_LOCK(wrch);
1699                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
1700                                 a->bytes = sndbuf_gettotal(bs);
1701                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
1702                                 a->ptr = sndbuf_getreadyptr(bs);
1703                                 wrch->blocks = sndbuf_getblocks(bs);
1704                                 CHN_UNLOCK(wrch);
1705                         } else
1706                                 ret = EINVAL;
1707                 }
1708                 break;
1709
1710         case SNDCTL_DSP_GETCAPS:
1711                 PCM_LOCK(d);
1712                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
1713                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1714                         *arg_i |= PCM_CAP_DUPLEX;
1715                 PCM_UNLOCK(d);
1716                 break;
1717
1718         case SOUND_PCM_READ_BITS:
1719                 chn = wrch ? wrch : rdch;
1720                 if (chn) {
1721                         CHN_LOCK(chn);
1722                         if (chn->format & AFMT_8BIT)
1723                                 *arg_i = 8;
1724                         else if (chn->format & AFMT_16BIT)
1725                                 *arg_i = 16;
1726                         else if (chn->format & AFMT_24BIT)
1727                                 *arg_i = 24;
1728                         else if (chn->format & AFMT_32BIT)
1729                                 *arg_i = 32;
1730                         else
1731                                 ret = EINVAL;
1732                         CHN_UNLOCK(chn);
1733                 } else {
1734                         *arg_i = 0;
1735                         ret = EINVAL;
1736                 }
1737                 break;
1738
1739         case SNDCTL_DSP_SETTRIGGER:
1740                 if (rdch) {
1741                         CHN_LOCK(rdch);
1742                         rdch->flags &= ~CHN_F_NOTRIGGER;
1743                         if (*arg_i & PCM_ENABLE_INPUT)
1744                                 chn_start(rdch, 1);
1745                         else {
1746                                 chn_abort(rdch);
1747                                 chn_resetbuf(rdch);
1748                                 rdch->flags |= CHN_F_NOTRIGGER;
1749                         }
1750                         CHN_UNLOCK(rdch);
1751                 }
1752                 if (wrch) {
1753                         CHN_LOCK(wrch);
1754                         wrch->flags &= ~CHN_F_NOTRIGGER;
1755                         if (*arg_i & PCM_ENABLE_OUTPUT)
1756                                 chn_start(wrch, 1);
1757                         else {
1758                                 chn_abort(wrch);
1759                                 chn_resetbuf(wrch);
1760                                 wrch->flags |= CHN_F_NOTRIGGER;
1761                         }
1762                         CHN_UNLOCK(wrch);
1763                 }
1764                 break;
1765
1766         case SNDCTL_DSP_GETTRIGGER:
1767                 *arg_i = 0;
1768                 if (wrch) {
1769                         CHN_LOCK(wrch);
1770                         if (wrch->flags & CHN_F_TRIGGERED)
1771                                 *arg_i |= PCM_ENABLE_OUTPUT;
1772                         CHN_UNLOCK(wrch);
1773                 }
1774                 if (rdch) {
1775                         CHN_LOCK(rdch);
1776                         if (rdch->flags & CHN_F_TRIGGERED)
1777                                 *arg_i |= PCM_ENABLE_INPUT;
1778                         CHN_UNLOCK(rdch);
1779                 }
1780                 break;
1781
1782         case SNDCTL_DSP_GETODELAY:
1783                 if (wrch) {
1784                         struct snd_dbuf *bs = wrch->bufsoft;
1785
1786                         CHN_LOCK(wrch);
1787                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
1788                         *arg_i = sndbuf_getready(bs);
1789                         CHN_UNLOCK(wrch);
1790                 } else
1791                         ret = EINVAL;
1792                 break;
1793
1794         case SNDCTL_DSP_POST:
1795                 if (wrch) {
1796                         CHN_LOCK(wrch);
1797                         wrch->flags &= ~CHN_F_NOTRIGGER;
1798                         chn_start(wrch, 1);
1799                         CHN_UNLOCK(wrch);
1800                 }
1801                 break;
1802
1803         case SNDCTL_DSP_SETDUPLEX:
1804                 /*
1805                  * switch to full-duplex mode if card is in half-duplex
1806                  * mode and is able to work in full-duplex mode
1807                  */
1808                 PCM_LOCK(d);
1809                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
1810                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
1811                 PCM_UNLOCK(d);
1812                 break;
1813
1814         /*
1815          * The following four ioctls are simple wrappers around mixer_ioctl
1816          * with no further processing.  xcmd is short for "translated
1817          * command".
1818          */
1819         case SNDCTL_DSP_GETRECVOL:
1820                 if (xcmd == 0) {
1821                         xcmd = SOUND_MIXER_READ_RECLEV;
1822                         chn = rdch;
1823                 }
1824                 /* FALLTHROUGH */
1825         case SNDCTL_DSP_SETRECVOL:
1826                 if (xcmd == 0) {
1827                         xcmd = SOUND_MIXER_WRITE_RECLEV;
1828                         chn = rdch;
1829                 }
1830                 /* FALLTHROUGH */
1831         case SNDCTL_DSP_GETPLAYVOL:
1832                 if (xcmd == 0) {
1833                         xcmd = SOUND_MIXER_READ_PCM;
1834                         chn = wrch;
1835                 }
1836                 /* FALLTHROUGH */
1837         case SNDCTL_DSP_SETPLAYVOL:
1838                 if (xcmd == 0) {
1839                         xcmd = SOUND_MIXER_WRITE_PCM;
1840                         chn = wrch;
1841                 }
1842
1843                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
1844                 if (ret != -1) {
1845                         PCM_GIANT_EXIT(d);
1846                         return (ret);
1847                 }
1848
1849                 if (d->mixer_dev != NULL) {
1850                         PCM_ACQUIRE_QUICK(d);
1851                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1,
1852                             MIXER_CMD_DIRECT);
1853                         PCM_RELEASE_QUICK(d);
1854                 } else
1855                         ret = ENOTSUP;
1856
1857                 break;
1858
1859         case SNDCTL_DSP_GET_RECSRC_NAMES:
1860         case SNDCTL_DSP_GET_RECSRC:
1861         case SNDCTL_DSP_SET_RECSRC:
1862                 if (d->mixer_dev != NULL) {
1863                         PCM_ACQUIRE_QUICK(d);
1864                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1,
1865                             MIXER_CMD_DIRECT);
1866                         PCM_RELEASE_QUICK(d);
1867                 } else
1868                         ret = ENOTSUP;
1869                 break;
1870
1871         /*
1872          * The following 3 ioctls aren't very useful at the moment.  For
1873          * now, only a single channel is associated with a cdev (/dev/dspN
1874          * instance), so there's only a single output routing to use (i.e.,
1875          * the wrch bound to this cdev).
1876          */
1877         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
1878                 {
1879                         oss_mixer_enuminfo *ei;
1880                         ei = (oss_mixer_enuminfo *)arg;
1881                         ei->dev = 0;
1882                         ei->ctrl = 0;
1883                         ei->version = 0; /* static for now */
1884                         ei->strindex[0] = 0;
1885
1886                         if (wrch != NULL) {
1887                                 ei->nvalues = 1;
1888                                 strlcpy(ei->strings, wrch->name,
1889                                         sizeof(ei->strings));
1890                         } else {
1891                                 ei->nvalues = 0;
1892                                 ei->strings[0] = '\0';
1893                         }
1894                 }
1895                 break;
1896         case SNDCTL_DSP_GET_PLAYTGT:
1897         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
1898                 /*
1899                  * Re: SET_PLAYTGT
1900                  *   OSSv4: "The value that was accepted by the device will
1901                  *   be returned back in the variable pointed by the
1902                  *   argument."
1903                  */
1904                 if (wrch != NULL)
1905                         *arg_i = 0;
1906                 else
1907                         ret = EINVAL;
1908                 break;
1909
1910         case SNDCTL_DSP_SILENCE:
1911         /*
1912          * Flush the software (pre-feed) buffer, but try to minimize playback
1913          * interruption.  (I.e., record unplayed samples with intent to
1914          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
1915          * functionality.
1916          */
1917                 if (wrch == NULL)
1918                         ret = EINVAL;
1919                 else {
1920                         struct snd_dbuf *bs;
1921                         CHN_LOCK(wrch);
1922                         while (wrch->inprog != 0)
1923                                 cv_wait(&wrch->cv, wrch->lock);
1924                         bs = wrch->bufsoft;
1925                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
1926                                 bs->sl = sndbuf_getready(bs);
1927                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
1928                                 sndbuf_fillsilence(bs);
1929                                 chn_start(wrch, 0);
1930                         }
1931                         CHN_UNLOCK(wrch);
1932                 }
1933                 break;
1934
1935         case SNDCTL_DSP_SKIP:
1936         /*
1937          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
1938          * playback buffer by moving the current write position immediately
1939          * before the point where the device is currently reading the samples."
1940          */
1941                 if (wrch == NULL)
1942                         ret = EINVAL;
1943                 else {
1944                         struct snd_dbuf *bs;
1945                         CHN_LOCK(wrch);
1946                         while (wrch->inprog != 0)
1947                                 cv_wait(&wrch->cv, wrch->lock);
1948                         bs = wrch->bufsoft;
1949                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
1950                                 sndbuf_softreset(bs);
1951                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
1952                                 bs->sl = 0;
1953                                 chn_start(wrch, 0);
1954                         }
1955                         CHN_UNLOCK(wrch);
1956                 }
1957                 break;
1958
1959         case SNDCTL_DSP_CURRENT_OPTR:
1960         case SNDCTL_DSP_CURRENT_IPTR:
1961         /**
1962          * @note Changing formats resets the buffer counters, which differs
1963          *       from the 4Front drivers.  However, I don't expect this to be
1964          *       much of a problem.
1965          *
1966          * @note In a test where @c CURRENT_OPTR is called immediately after write
1967          *       returns, this driver is about 32K samples behind whereas
1968          *       4Front's is about 8K samples behind.  Should determine source
1969          *       of discrepancy, even if only out of curiosity.
1970          *
1971          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
1972          */
1973                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
1974                 if (chn == NULL)
1975                         ret = EINVAL;
1976                 else {
1977                         struct snd_dbuf *bs;
1978                         /* int tmp; */
1979
1980                         oss_count_t *oc = (oss_count_t *)arg;
1981
1982                         CHN_LOCK(chn);
1983                         bs = chn->bufsoft;
1984 #if 0
1985                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
1986                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
1987                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
1988 #else
1989                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
1990                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
1991 #endif
1992                         CHN_UNLOCK(chn);
1993                 }
1994                 break;
1995
1996         case SNDCTL_DSP_HALT_OUTPUT:
1997         case SNDCTL_DSP_HALT_INPUT:
1998                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
1999                 if (chn == NULL)
2000                         ret = EINVAL;
2001                 else {
2002                         CHN_LOCK(chn);
2003                         chn_abort(chn);
2004                         CHN_UNLOCK(chn);
2005                 }
2006                 break;
2007
2008         case SNDCTL_DSP_LOW_WATER:
2009         /*
2010          * Set the number of bytes required to attract attention by
2011          * select/poll.
2012          */
2013                 if (wrch != NULL) {
2014                         CHN_LOCK(wrch);
2015                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
2016                         CHN_UNLOCK(wrch);
2017                 }
2018                 if (rdch != NULL) {
2019                         CHN_LOCK(rdch);
2020                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
2021                         CHN_UNLOCK(rdch);
2022                 }
2023                 break;
2024
2025         case SNDCTL_DSP_GETERROR:
2026         /*
2027          * OSSv4 docs:  "All errors and counters will automatically be
2028          * cleared to zeroes after the call so each call will return only
2029          * the errors that occurred after the previous invocation. ... The
2030          * play_underruns and rec_overrun fields are the only useful fields
2031          * returned by OSS 4.0."
2032          */
2033                 {
2034                         audio_errinfo *ei = (audio_errinfo *)arg;
2035
2036                         bzero((void *)ei, sizeof(*ei));
2037
2038                         if (wrch != NULL) {
2039                                 CHN_LOCK(wrch);
2040                                 ei->play_underruns = wrch->xruns;
2041                                 wrch->xruns = 0;
2042                                 CHN_UNLOCK(wrch);
2043                         }
2044                         if (rdch != NULL) {
2045                                 CHN_LOCK(rdch);
2046                                 ei->rec_overruns = rdch->xruns;
2047                                 rdch->xruns = 0;
2048                                 CHN_UNLOCK(rdch);
2049                         }
2050                 }
2051                 break;
2052
2053         case SNDCTL_DSP_SYNCGROUP:
2054                 PCM_ACQUIRE_QUICK(d);
2055                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
2056                 PCM_RELEASE_QUICK(d);
2057                 break;
2058
2059         case SNDCTL_DSP_SYNCSTART:
2060                 PCM_ACQUIRE_QUICK(d);
2061                 ret = dsp_oss_syncstart(*arg_i);
2062                 PCM_RELEASE_QUICK(d);
2063                 break;
2064
2065         case SNDCTL_DSP_POLICY:
2066                 PCM_ACQUIRE_QUICK(d);
2067                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
2068                 PCM_RELEASE_QUICK(d);
2069                 break;
2070
2071         case SNDCTL_DSP_COOKEDMODE:
2072                 PCM_ACQUIRE_QUICK(d);
2073                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
2074                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
2075                 PCM_RELEASE_QUICK(d);
2076                 break;
2077         case SNDCTL_DSP_GET_CHNORDER:
2078                 PCM_ACQUIRE_QUICK(d);
2079                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
2080                 PCM_RELEASE_QUICK(d);
2081                 break;
2082         case SNDCTL_DSP_SET_CHNORDER:
2083                 PCM_ACQUIRE_QUICK(d);
2084                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
2085                 PCM_RELEASE_QUICK(d);
2086                 break;
2087         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
2088                 PCM_ACQUIRE_QUICK(d);
2089                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
2090                 PCM_RELEASE_QUICK(d);
2091                 break;
2092         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
2093                 ret = EINVAL;
2094                 break;
2095 #ifdef  OSSV4_EXPERIMENT
2096         /*
2097          * XXX The following ioctls are not yet supported and just return
2098          * EINVAL.
2099          */
2100         case SNDCTL_DSP_GETOPEAKS:
2101         case SNDCTL_DSP_GETIPEAKS:
2102                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
2103                 if (chn == NULL)
2104                         ret = EINVAL;
2105                 else {
2106                         oss_peaks_t *op = (oss_peaks_t *)arg;
2107                         int lpeak, rpeak;
2108
2109                         CHN_LOCK(chn);
2110                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
2111                         if (ret == -1)
2112                                 ret = EINVAL;
2113                         else {
2114                                 (*op)[0] = lpeak;
2115                                 (*op)[1] = rpeak;
2116                         }
2117                         CHN_UNLOCK(chn);
2118                 }
2119                 break;
2120
2121         /*
2122          * XXX Once implemented, revisit this for proper cv protection
2123          *     (if necessary).
2124          */
2125         case SNDCTL_GETLABEL:
2126                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
2127                 break;
2128         case SNDCTL_SETLABEL:
2129                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
2130                 break;
2131         case SNDCTL_GETSONG:
2132                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
2133                 break;
2134         case SNDCTL_SETSONG:
2135                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
2136                 break;
2137         case SNDCTL_SETNAME:
2138                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
2139                 break;
2140 #if 0
2141         /**
2142          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
2143          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
2144          * 4Front Technologies.
2145          */
2146         case SNDCTL_DSP_READCTL:
2147         case SNDCTL_DSP_WRITECTL:
2148                 ret = EINVAL;
2149                 break;
2150 #endif  /* !0 (explicitly omitted ioctls) */
2151
2152 #endif  /* !OSSV4_EXPERIMENT */
2153         case SNDCTL_DSP_MAPINBUF:
2154         case SNDCTL_DSP_MAPOUTBUF:
2155         case SNDCTL_DSP_SETSYNCRO:
2156                 /* undocumented */
2157
2158         case SNDCTL_DSP_SUBDIVIDE:
2159         case SOUND_PCM_WRITE_FILTER:
2160         case SOUND_PCM_READ_FILTER:
2161                 /* dunno what these do, don't sound important */
2162
2163         default:
2164                 DEB(kprintf("default ioctl fn 0x%08lx fail\n", cmd));
2165                 ret = EINVAL;
2166                 break;
2167         }
2168
2169         PCM_GIANT_LEAVE(d);
2170
2171         return (ret);
2172 }
2173
2174 static struct filterops dsp_read_filtops =
2175         { FILTEROP_ISFD, NULL, dsp_filter_detach, dsp_filter_read };
2176 static struct filterops dsp_write_filtops =
2177         { FILTEROP_ISFD, NULL, dsp_filter_detach, dsp_filter_write };
2178
2179 static int
2180 /*dsp_poll(struct cdev *i_dev, int events, struct thread *td)*/
2181 dsp_kqfilter(struct dev_kqfilter_args *ap)
2182 {
2183         struct knote *kn = ap->a_kn;
2184         struct klist *klist;
2185         struct cdev *i_dev = ap->a_head.a_dev;
2186         struct snddev_info *d;
2187         struct pcm_channel *wrch, *rdch;
2188         struct snd_dbuf *bs = NULL;
2189         int ret;
2190
2191         d = dsp_get_info(i_dev);
2192         if (!DSP_REGISTERED(d, i_dev))
2193                 return (EBADF);
2194
2195         PCM_GIANT_ENTER(d);
2196
2197         wrch = NULL;
2198         rdch = NULL;
2199         ret = 0;
2200
2201         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2202
2203         switch (kn->kn_filter) {
2204         case EVFILT_READ:
2205                 if (rdch) {
2206                         kn->kn_fop = &dsp_read_filtops;
2207                         kn->kn_hook = (caddr_t)rdch;
2208                         bs = rdch->bufsoft;
2209                         ap->a_result = 0;
2210                 }
2211                 break;
2212         case EVFILT_WRITE:
2213                 if (wrch) {
2214                         kn->kn_fop = &dsp_write_filtops;
2215                         kn->kn_hook = (caddr_t)wrch;
2216                         bs = wrch->bufsoft;
2217                         ap->a_result = 0;
2218                 }
2219                 break;
2220         default:
2221                 ap->a_result = EOPNOTSUPP;
2222                 break;
2223         }
2224
2225         if (ap->a_result == 0) {
2226                 klist = &sndbuf_getkq(bs)->ki_note;
2227                 knote_insert(klist, kn);
2228         }
2229
2230         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2231
2232         PCM_GIANT_LEAVE(d);
2233
2234         return (ret);
2235 }
2236
2237 static void
2238 dsp_filter_detach(struct knote *kn)
2239 {
2240         struct pcm_channel *ch = (struct pcm_channel *)kn->kn_hook;
2241         struct snd_dbuf *bs = ch->bufsoft;
2242         struct klist *klist;
2243
2244         CHN_LOCK(ch);
2245         klist = &sndbuf_getkq(bs)->ki_note;
2246         knote_remove(klist, kn);
2247         CHN_UNLOCK(ch);
2248 }
2249
2250 static int
2251 dsp_filter_read(struct knote *kn, long hint)
2252 {
2253         struct pcm_channel *rdch = (struct pcm_channel *)kn->kn_hook;
2254         struct thread *td = curthread;
2255         int ready;
2256
2257         CHN_LOCK(rdch);
2258         ready = chn_poll(rdch, 1, td);
2259         CHN_UNLOCK(rdch);
2260
2261         return (ready);
2262 }
2263
2264 static int
2265 dsp_filter_write(struct knote *kn, long hint)
2266 {
2267         struct pcm_channel *wrch = (struct pcm_channel *)kn->kn_hook;
2268         struct thread *td = curthread;
2269         int ready;
2270
2271         CHN_LOCK(wrch);
2272         ready = chn_poll(wrch, 1, td);
2273         CHN_UNLOCK(wrch);
2274
2275         return (ready);
2276 }
2277
2278 static int
2279 dsp_mmap(struct dev_mmap_args *ap)
2280 {
2281         vm_offset_t offset = ap->a_offset;
2282
2283         /* XXX memattr is not honored */
2284         ap->a_result = vtophys(offset);
2285         return (0);
2286 }
2287
2288 static int
2289 dsp_mmap_single(struct dev_mmap_single_args *ap)
2290 {
2291         struct cdev *i_dev = ap->a_head.a_dev;
2292         vm_ooffset_t *offset = ap->a_offset;
2293         vm_size_t size = ap->a_size;
2294         struct vm_object **object = ap->a_object;
2295         int nprot = ap->a_nprot;
2296         struct snddev_info *d;
2297         struct pcm_channel *wrch, *rdch, *c;
2298
2299         /*
2300          * Reject PROT_EXEC by default. It just doesn't makes sense.
2301          * Unfortunately, we have to give up this one due to linux_mmap
2302          * changes.
2303          *
2304          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
2305          *
2306          */
2307 #ifdef SV_ABI_LINUX
2308         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
2309             (dsp_mmap_allow_prot_exec == 0 &&
2310             SV_CURPROC_ABI() != SV_ABI_LINUX)))
2311 #else
2312         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
2313 #endif
2314                 return (EINVAL);
2315
2316         /*
2317          * PROT_READ (alone) selects the input buffer.
2318          * PROT_WRITE (alone) selects the output buffer.
2319          * PROT_WRITE|PROT_READ together select the output buffer.
2320          */
2321         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
2322                 return (EINVAL);
2323
2324         d = dsp_get_info(i_dev);
2325         if (!DSP_REGISTERED(d, i_dev))
2326                 return (EINVAL);
2327
2328         PCM_GIANT_ENTER(d);
2329
2330         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2331
2332         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
2333         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
2334             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
2335             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
2336             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
2337                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2338                 PCM_GIANT_EXIT(d);
2339                 return (EINVAL);
2340         }
2341
2342         if (wrch != NULL)
2343                 wrch->flags |= CHN_F_MMAP;
2344         if (rdch != NULL)
2345                 rdch->flags |= CHN_F_MMAP;
2346
2347         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
2348         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
2349         *object = dev_pager_alloc(i_dev, size, nprot, *offset);
2350
2351         PCM_GIANT_LEAVE(d);
2352
2353         if (*object == NULL)
2354                  return (EINVAL);
2355         return (0);
2356 }
2357
2358 /*
2359  * for i = 0 to channels of device N
2360  * if dspN.i isn't busy and in the right dir, create a dev_t and return it
2361  */
2362 int
2363 dsp_clone(struct dev_clone_args *ap)
2364 {
2365         struct cdev *i_dev = ap->a_head.a_dev;
2366         struct snddev_info *d;
2367         struct snd_clone_entry *ce;
2368         struct pcm_channel *c;
2369         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
2370         size_t len;
2371         char sname[64];
2372         int err = EBUSY;
2373         static struct cdev *dev = NULL;
2374
2375         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
2376
2377         /*
2378          * The default dsp device has a special unit which must be adjusted,
2379          * otherwise the unit number is already correct.
2380          */
2381         unit = PCMUNIT(i_dev);
2382         if (unit == PCMUNIT_DEFAULT)
2383                 unit = snd_unit;
2384
2385         ksnprintf(sname, sizeof(sname), "%s", ap->a_name);
2386         len = strlen(sname);
2387         while (len && sname[len-1] >= '0' && sname[len-1] <= '9')
2388                 --len;
2389         sname[len] = 0;
2390
2391         cunit = -1;
2392         devtype = -1;
2393         devhw = 0;
2394         devcmax = -1;
2395         tumax = -1;
2396
2397         for (i = 0; i < sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0]); ++i) {
2398                 if (strcmp(dsp_cdevs[i].name, sname) != 0)
2399                         continue;
2400                 devtype = dsp_cdevs[i].type;
2401                 devhw = dsp_cdevs[i].hw;
2402                 devcmax = dsp_cdevs[i].max - 1;
2403                 break;
2404         }
2405
2406         d = devclass_get_softc(pcm_devclass, unit);
2407         if (!PCM_REGISTERED(d) || d->clones == NULL) {
2408                 return (ENODEV);
2409         }
2410
2411         /* XXX Need Giant magic entry ??? */
2412
2413         PCM_LOCK(d);
2414         if (snd_clone_disabled(d->clones)) {
2415                 PCM_UNLOCK(d);
2416                 return (ENODEV);
2417         }
2418
2419         PCM_WAIT(d);
2420         PCM_ACQUIRE(d);
2421         PCM_UNLOCK(d);
2422
2423         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
2424
2425         if (devhw != 0) {
2426                 KASSERT(devcmax <= dsp_cmax,
2427                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
2428                 if (cunit > devcmax) {
2429                         PCM_RELEASE_QUICK(d);
2430                         return (ENODEV);
2431                 }
2432                 udcmask |= snd_c2unit(cunit);
2433                 CHN_FOREACH(c, d, channels.pcm) {
2434                         CHN_LOCK(c);
2435                         if (c->unit != udcmask) {
2436                                 CHN_UNLOCK(c);
2437                                 continue;
2438                         }
2439                         CHN_UNLOCK(c);
2440                         udcmask &= ~snd_c2unit(cunit);
2441                         /*
2442                          * Temporarily increase clone maxunit to overcome
2443                          * vchan flexibility.
2444                          *
2445                          * # sysctl dev.pcm.0.play.vchans=256
2446                          * dev.pcm.0.play.vchans: 1 -> 256
2447                          * # cat /dev/zero > /dev/dsp0.vp255 &
2448                          * [1] 17296
2449                          * # sysctl dev.pcm.0.play.vchans=0
2450                          * dev.pcm.0.play.vchans: 256 -> 1
2451                          * # fg
2452                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
2453                          * ^C
2454                          * # cat /dev/zero > /dev/dsp0.vp255
2455                          * zsh: operation not supported: /dev/dsp0.vp255
2456                          */
2457                         tumax = snd_clone_getmaxunit(d->clones);
2458                         if (cunit > tumax)
2459                                 snd_clone_setmaxunit(d->clones, cunit);
2460                         else
2461                                 tumax = -1;
2462                         goto dsp_clone_alloc;
2463                 }
2464                 /*
2465                  * Ok, so we're requesting unallocated vchan, but still
2466                  * within maximum vchan limit.
2467                  */
2468                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
2469                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
2470                     cunit < snd_maxautovchans) {
2471                         udcmask &= ~snd_c2unit(cunit);
2472                         tumax = snd_clone_getmaxunit(d->clones);
2473                         if (cunit > tumax)
2474                                 snd_clone_setmaxunit(d->clones, cunit);
2475                         else
2476                                 tumax = -1;
2477                         goto dsp_clone_alloc;
2478                 }
2479                 PCM_RELEASE_QUICK(d);
2480                 return (err);
2481         }
2482
2483         /*
2484          * Allocate channel, create device if necessary.
2485          */
2486 dsp_clone_alloc:
2487         ce = snd_clone_alloc(d->clones, &dev, &cunit, udcmask);
2488         if (tumax != -1)
2489                 snd_clone_setmaxunit(d->clones, tumax);
2490         if (ce != NULL) {
2491                 /*
2492                  * NOTE: Subunit is a unique number unrelated to the
2493                  *       channel id.
2494                  */
2495                 udcmask |= snd_c2unit(cunit);
2496                 int subunit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(dsp), 0);
2497
2498                 dev = make_only_dev(&dsp_ops,
2499                     PCMMKMINOR(unit, devtype, subunit),
2500                     UID_ROOT, GID_WHEEL, 0666, "%s%d.%d",
2501                     sname, unit, subunit);
2502                 snd_clone_register(ce, dev);
2503                 err = 0;
2504         } else {
2505                 /*
2506                  * Use device already registered, we must add a ref to the
2507                  * device.
2508                  */
2509                 err = 0;
2510         }
2511
2512         ap->a_dev = dev;
2513
2514         PCM_RELEASE_QUICK(d);
2515
2516         return (err);
2517 }
2518
2519 static void
2520 dsp_sysinit(void *p)
2521 {
2522         if (dsp_ehtag != NULL)
2523                 return;
2524         /* initialize unit numbering */
2525         snd_unit_init();
2526         dsp_umax = PCMMAXUNIT;
2527         dsp_cmax = PCMMAXCHAN;
2528         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
2529
2530         devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(dsp));
2531 }
2532
2533 static void
2534 dsp_sysuninit(void *p)
2535 {
2536         if (dsp_ehtag == NULL)
2537                 return;
2538         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
2539         dsp_ehtag = NULL;
2540 }
2541
2542 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
2543 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
2544
2545 char *
2546 dsp_unit2name(char *buf, size_t len, int unit)
2547 {
2548         int i, dtype;
2549
2550         KASSERT(buf != NULL && len != 0,
2551             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
2552
2553         dtype = snd_unit2d(unit);
2554
2555         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
2556                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
2557                         continue;
2558                 ksnprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
2559                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
2560                 return (buf);
2561         }
2562
2563         return (NULL);
2564 }
2565
2566 /**
2567  * @brief Handler for SNDCTL_AUDIOINFO.
2568  *
2569  * Gathers information about the audio device specified in ai->dev.  If
2570  * ai->dev == -1, then this function gathers information about the current
2571  * device.  If the call comes in on a non-audio device and ai->dev == -1,
2572  * return EINVAL.
2573  *
2574  * This routine is supposed to go practically straight to the hardware,
2575  * getting capabilities directly from the sound card driver, side-stepping
2576  * the intermediate channel interface.
2577  *
2578  * Note, however, that the usefulness of this command is significantly
2579  * decreased when requesting info about any device other than the one serving
2580  * the request. While each snddev_channel refers to a specific device node,
2581  * the converse is *not* true.  Currently, when a sound device node is opened,
2582  * the sound subsystem scans for an available audio channel (or channels, if
2583  * opened in read+write) and then assigns them to the si_drv[12] private
2584  * data fields.  As a result, any information returned linking a channel to
2585  * a specific character device isn't necessarily accurate.
2586  *
2587  * @note
2588  * Calling threads must not hold any snddev_info or pcm_channel locks.
2589  *
2590  * @param dev           device on which the ioctl was issued
2591  * @param ai            ioctl request data container
2592  *
2593  * @retval 0            success
2594  * @retval EINVAL       ai->dev specifies an invalid device
2595  *
2596  * @todo Verify correctness of Doxygen tags.  ;)
2597  */
2598 int
2599 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
2600 {
2601         struct pcmchan_caps *caps;
2602         struct pcm_channel *ch;
2603         struct snddev_info *d;
2604         uint32_t fmts;
2605         int i, nchan, *rates, minch, maxch;
2606         char *devname, buf[CHN_NAMELEN];
2607
2608         /*
2609          * If probing the device that received the ioctl, make sure it's a
2610          * DSP device.  (Users may use this ioctl with /dev/mixer and
2611          * /dev/midi.)
2612          */
2613         if (ai->dev == -1 && i_dev->si_ops != &dsp_ops)
2614                 return (EINVAL);
2615
2616         ch = NULL;
2617         devname = NULL;
2618         nchan = 0;
2619         bzero(buf, sizeof(buf));
2620
2621         /*
2622          * Search for the requested audio device (channel).  Start by
2623          * iterating over pcm devices.
2624          */
2625         for (i = 0; pcm_devclass != NULL &&
2626             i < devclass_get_maxunit(pcm_devclass); i++) {
2627                 d = devclass_get_softc(pcm_devclass, i);
2628                 if (!PCM_REGISTERED(d))
2629                         continue;
2630
2631                 /* XXX Need Giant magic entry ??? */
2632
2633                 /* See the note in function docblock */
2634                 PCM_UNLOCKASSERT(d);
2635                 PCM_LOCK(d);
2636
2637                 CHN_FOREACH(ch, d, channels.pcm) {
2638                         CHN_UNLOCKASSERT(ch);
2639                         CHN_LOCK(ch);
2640                         if (ai->dev == -1) {
2641                                 if (DSP_REGISTERED(d, i_dev) &&
2642                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
2643                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
2644                                         devname = dsp_unit2name(buf,
2645                                             sizeof(buf), ch->unit);
2646                                 }
2647                         } else if (ai->dev == nchan) {
2648                                 devname = dsp_unit2name(buf, sizeof(buf),
2649                                     ch->unit);
2650                         }
2651                         if (devname != NULL)
2652                                 break;
2653                         CHN_UNLOCK(ch);
2654                         ++nchan;
2655                 }
2656
2657                 if (devname != NULL) {
2658                         /*
2659                          * At this point, the following synchronization stuff
2660                          * has happened:
2661                          * - a specific PCM device is locked.
2662                          * - a specific audio channel has been locked, so be
2663                          *   sure to unlock when exiting;
2664                          */
2665
2666                         caps = chn_getcaps(ch);
2667
2668                         /*
2669                          * With all handles collected, zero out the user's
2670                          * container and begin filling in its fields.
2671                          */
2672                         bzero((void *)ai, sizeof(oss_audioinfo));
2673
2674                         ai->dev = nchan;
2675                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
2676
2677                         if ((ch->flags & CHN_F_BUSY) == 0)
2678                                 ai->busy = 0;
2679                         else
2680                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
2681
2682                         /**
2683                          * @note
2684                          * @c cmd - OSSv4 docs: "Only supported under Linux at
2685                          *    this moment." Cop-out, I know, but I'll save
2686                          *    running around in the process table for later.
2687                          *    Is there a risk of leaking information?
2688                          */
2689                         ai->pid = ch->pid;
2690
2691                         /*
2692                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
2693                          * Note, however, that a single channel operates in
2694                          * only one direction, so PCM_CAP_DUPLEX is out.
2695                          */
2696                         /**
2697                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
2698                          *       these in pcmchan::caps?
2699                          */
2700                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
2701                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
2702
2703                         /*
2704                          * Collect formats supported @b natively by the
2705                          * device.  Also determine min/max channels.  (I.e.,
2706                          * mono, stereo, or both?)
2707                          *
2708                          * If any channel is stereo, maxch = 2;
2709                          * if all channels are stereo, minch = 2, too;
2710                          * if any channel is mono, minch = 1;
2711                          * and if all channels are mono, maxch = 1.
2712                          */
2713                         minch = 0;
2714                         maxch = 0;
2715                         fmts = 0;
2716                         for (i = 0; caps->fmtlist[i]; i++) {
2717                                 fmts |= caps->fmtlist[i];
2718                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
2719                                         minch = (minch == 0) ? 2 : minch;
2720                                         maxch = 2;
2721                                 } else {
2722                                         minch = 1;
2723                                         maxch = (maxch == 0) ? 1 : maxch;
2724                                 }
2725                         }
2726
2727                         if (ch->direction == PCMDIR_PLAY)
2728                                 ai->oformats = fmts;
2729                         else
2730                                 ai->iformats = fmts;
2731
2732                         /**
2733                          * @note
2734                          * @c magic - OSSv4 docs: "Reserved for internal use
2735                          *    by OSS."
2736                          *
2737                          * @par
2738                          * @c card_number - OSSv4 docs: "Number of the sound
2739                          *    card where this device belongs or -1 if this
2740                          *    information is not available.  Applications
2741                          *    should normally not use this field for any
2742                          *    purpose."
2743                          */
2744                         ai->card_number = -1;
2745                         /**
2746                          * @todo @c song_name - depends first on
2747                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
2748                          *          on SNDCTL_[GS]ETLABEL
2749                          * @todo @c port_number - routing information?
2750                          */
2751                         ai->port_number = -1;
2752                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
2753                         /**
2754                          * @note
2755                          * @c real_device - OSSv4 docs:  "Obsolete."
2756                          */
2757                         ai->real_device = -1;
2758                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
2759                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
2760                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
2761                         /**
2762                          * @note
2763                          * @c flags - OSSv4 docs: "Reserved for future use."
2764                          *
2765                          * @note
2766                          * @c binding - OSSv4 docs: "Reserved for future use."
2767                          *
2768                          * @todo @c handle - haven't decided how to generate
2769                          *       this yet; bus, vendor, device IDs?
2770                          */
2771                         ai->min_rate = caps->minspeed;
2772                         ai->max_rate = caps->maxspeed;
2773
2774                         ai->min_channels = minch;
2775                         ai->max_channels = maxch;
2776
2777                         ai->nrates = chn_getrates(ch, &rates);
2778                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
2779                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
2780
2781                         for (i = 0; i < ai->nrates; i++)
2782                                 ai->rates[i] = rates[i];
2783
2784                         ai->next_play_engine = 0;
2785                         ai->next_rec_engine = 0;
2786
2787                         CHN_UNLOCK(ch);
2788                 }
2789
2790                 PCM_UNLOCK(d);
2791
2792                 if (devname != NULL)
2793                         return (0);
2794         }
2795
2796         /* Exhausted the search -- nothing is locked, so return. */
2797         return (EINVAL);
2798 }
2799
2800 /**
2801  * @brief Assigns a PCM channel to a sync group.
2802  *
2803  * Sync groups are used to enable audio operations on multiple devices
2804  * simultaneously.  They may be used with any number of devices and may
2805  * span across applications.  Devices are added to groups with
2806  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
2807  * SNDCTL_DSP_SYNCSTART ioctl.
2808  *
2809  * If the @c id field of the @c group parameter is set to zero, then a new
2810  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
2811  * the group specified.
2812  *
2813  * @todo As far as memory allocation, should we assume that things are
2814  *       okay and allocate with M_WAITOK before acquiring channel locks,
2815  *       freeing later if not?
2816  *
2817  * @param wrch  output channel associated w/ device (if any)
2818  * @param rdch  input channel associated w/ device (if any)
2819  * @param group Sync group parameters
2820  *
2821  * @retval 0            success
2822  * @retval non-zero     error to be propagated upstream
2823  */
2824 static int
2825 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
2826 {
2827         struct pcmchan_syncmember *smrd, *smwr;
2828         struct pcmchan_syncgroup *sg;
2829         int ret, sg_ids[3];
2830
2831         smrd = NULL;
2832         smwr = NULL;
2833         sg = NULL;
2834         ret = 0;
2835
2836         /*
2837          * Free_unr() may sleep, so store released syncgroup IDs until after
2838          * all locks are released.
2839          */
2840         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
2841
2842         PCM_SG_LOCK();
2843
2844         /*
2845          * - Insert channel(s) into group's member list.
2846          * - Set CHN_F_NOTRIGGER on channel(s).
2847          * - Stop channel(s).
2848          */
2849
2850         /*
2851          * If device's channels are already mapped to a group, unmap them.
2852          */
2853         if (wrch) {
2854                 CHN_LOCK(wrch);
2855                 sg_ids[0] = chn_syncdestroy(wrch);
2856         }
2857
2858         if (rdch) {
2859                 CHN_LOCK(rdch);
2860                 sg_ids[1] = chn_syncdestroy(rdch);
2861         }
2862
2863         /*
2864          * Verify that mode matches character device properites.
2865          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
2866          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
2867          */
2868         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
2869             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
2870                 ret = EINVAL;
2871                 goto out;
2872         }
2873
2874         /*
2875          * An id of zero indicates the user wants to create a new
2876          * syncgroup.
2877          */
2878         if (group->id == 0) {
2879                 sg = (struct pcmchan_syncgroup *)kmalloc(sizeof(*sg), M_DEVBUF, M_WAITOK | M_ZERO);
2880                 if (sg != NULL) {
2881                         SLIST_INIT(&sg->members);
2882                         sg->id = alloc_unr(pcmsg_unrhdr);
2883
2884                         group->id = sg->id;
2885                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
2886                 } else
2887                         ret = ENOMEM;
2888         } else {
2889                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
2890                         if (sg->id == group->id)
2891                                 break;
2892                 }
2893                 if (sg == NULL)
2894                         ret = EINVAL;
2895         }
2896
2897         /* Couldn't create or find a syncgroup.  Fail. */
2898         if (sg == NULL)
2899                 goto out;
2900
2901         /*
2902          * Allocate a syncmember, assign it and a channel together, and
2903          * insert into syncgroup.
2904          */
2905         if (group->mode & PCM_ENABLE_INPUT) {
2906                 smrd = (struct pcmchan_syncmember *)kmalloc(sizeof(*smrd), M_DEVBUF, M_WAITOK | M_ZERO);
2907                 if (smrd == NULL) {
2908                         ret = ENOMEM;
2909                         goto out;
2910                 }
2911
2912                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
2913                 smrd->parent = sg;
2914                 smrd->ch = rdch;
2915
2916                 chn_abort(rdch);
2917                 rdch->flags |= CHN_F_NOTRIGGER;
2918                 rdch->sm = smrd;
2919         }
2920
2921         if (group->mode & PCM_ENABLE_OUTPUT) {
2922                 smwr = (struct pcmchan_syncmember *)kmalloc(sizeof(*smwr), M_DEVBUF, M_WAITOK | M_ZERO);
2923                 if (smwr == NULL) {
2924                         ret = ENOMEM;
2925                         goto out;
2926                 }
2927
2928                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
2929                 smwr->parent = sg;
2930                 smwr->ch = wrch;
2931
2932                 chn_abort(wrch);
2933                 wrch->flags |= CHN_F_NOTRIGGER;
2934                 wrch->sm = smwr;
2935         }
2936
2937
2938 out:
2939         if (ret != 0) {
2940                 if (smrd != NULL)
2941                         kfree(smrd, M_DEVBUF);
2942                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
2943                         sg_ids[2] = sg->id;
2944                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
2945                         kfree(sg, M_DEVBUF);
2946                 }
2947
2948                 if (wrch)
2949                         wrch->sm = NULL;
2950                 if (rdch)
2951                         rdch->sm = NULL;
2952         }
2953
2954         if (wrch)
2955                 CHN_UNLOCK(wrch);
2956         if (rdch)
2957                 CHN_UNLOCK(rdch);
2958
2959         PCM_SG_UNLOCK();
2960
2961         if (sg_ids[0])
2962                 free_unr(pcmsg_unrhdr, sg_ids[0]);
2963         if (sg_ids[1])
2964                 free_unr(pcmsg_unrhdr, sg_ids[1]);
2965         if (sg_ids[2])
2966                 free_unr(pcmsg_unrhdr, sg_ids[2]);
2967
2968         return (ret);
2969 }
2970
2971 /**
2972  * @brief Launch a sync group into action
2973  *
2974  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
2975  * iterates over all members, triggering them along the way.
2976  *
2977  * @note Caller must not hold any channel locks.
2978  *
2979  * @param sg_id sync group identifier
2980  *
2981  * @retval 0    success
2982  * @retval non-zero     error worthy of propagating upstream to user
2983  */
2984 static int
2985 dsp_oss_syncstart(int sg_id)
2986 {
2987         struct pcmchan_syncmember *sm, *sm_tmp;
2988         struct pcmchan_syncgroup *sg;
2989         struct pcm_channel *c;
2990         int ret, needlocks;
2991
2992         /* Get the synclists lock */
2993         PCM_SG_LOCK();
2994
2995         do {
2996                 ret = 0;
2997                 needlocks = 0;
2998
2999                 /* Search for syncgroup by ID */
3000                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
3001                         if (sg->id == sg_id)
3002                                 break;
3003                 }
3004
3005                 /* Return EINVAL if not found */
3006                 if (sg == NULL) {
3007                         ret = EINVAL;
3008                         break;
3009                 }
3010
3011                 /* Any removals resulting in an empty group should've handled this */
3012                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
3013
3014                 /*
3015                  * Attempt to lock all member channels - if any are already
3016                  * locked, unlock those acquired, sleep for a bit, and try
3017                  * again.
3018                  */
3019                 SLIST_FOREACH(sm, &sg->members, link) {
3020                         if (CHN_TRYLOCK(sm->ch) == 0) {
3021                                 int timo = hz * 5/1000;
3022                                 if (timo < 1)
3023                                         timo = 1;
3024
3025                                 /* Release all locked channels so far, retry */
3026                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
3027                                         /* sm is the member already locked */
3028                                         if (sm == sm_tmp)
3029                                                 break;
3030                                         CHN_UNLOCK(sm_tmp->ch);
3031                                 }
3032
3033                                 /** @todo Is PRIBIO correct/ */
3034                                 ret = lksleep(sm, &snd_pcm_syncgroups_mtx,
3035                                     PCATCH, "pcmsg", timo);
3036                                 if (ret == EINTR || ret == ERESTART)
3037                                         break;
3038
3039                                 needlocks = 1;
3040                                 ret = 0; /* Assumes ret == EAGAIN... */
3041                         }
3042                 }
3043         } while (needlocks && ret == 0);
3044
3045         /* Proceed only if no errors encountered. */
3046         if (ret == 0) {
3047                 /* Launch channels */
3048                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
3049                         SLIST_REMOVE_HEAD(&sg->members, link);
3050
3051                         c = sm->ch;
3052                         c->sm = NULL;
3053                         chn_start(c, 1);
3054                         c->flags &= ~CHN_F_NOTRIGGER;
3055                         CHN_UNLOCK(c);
3056
3057                         kfree(sm, M_DEVBUF);
3058                 }
3059
3060                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
3061                 kfree(sg, M_DEVBUF);
3062         }
3063
3064         PCM_SG_UNLOCK();
3065
3066         /*
3067          * Free_unr() may sleep, so be sure to give up the syncgroup lock
3068          * first.
3069          */
3070         if (ret == 0)
3071                 free_unr(pcmsg_unrhdr, sg_id);
3072
3073         return (ret);
3074 }
3075
3076 /**
3077  * @brief Handler for SNDCTL_DSP_POLICY
3078  *
3079  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
3080  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
3081  * specifying those two parameters, s/he simply selects a number from 0..10
3082  * which corresponds to a buffer size.  Smaller numbers request smaller
3083  * buffers with lower latencies (at greater overhead from more frequent
3084  * interrupts), while greater numbers behave in the opposite manner.
3085  *
3086  * The 4Front spec states that a value of 5 should be the default.  However,
3087  * this implementation deviates slightly by using a linear scale without
3088  * consulting drivers.  I.e., even though drivers may have different default
3089  * buffer sizes, a policy argument of 5 will have the same result across
3090  * all drivers.
3091  *
3092  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
3093  * more information.
3094  *
3095  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
3096  *       work with hardware drivers directly.
3097  *
3098  * @note PCM channel arguments must not be locked by caller.
3099  *
3100  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
3101  * @param rdch  " recording channel (optional; may be NULL)
3102  * @param policy Integer from [0:10]
3103  *
3104  * @retval 0    constant (for now)
3105  */
3106 static int
3107 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
3108 {
3109         int ret;
3110
3111         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
3112                 return (EIO);
3113
3114         /* Default: success */
3115         ret = 0;
3116
3117         if (rdch) {
3118                 CHN_LOCK(rdch);
3119                 ret = chn_setlatency(rdch, policy);
3120                 CHN_UNLOCK(rdch);
3121         }
3122
3123         if (wrch && ret == 0) {
3124                 CHN_LOCK(wrch);
3125                 ret = chn_setlatency(wrch, policy);
3126                 CHN_UNLOCK(wrch);
3127         }
3128
3129         if (ret)
3130                 ret = EIO;
3131
3132         return (ret);
3133 }
3134
3135 /**
3136  * @brief Enable or disable "cooked" mode
3137  *
3138  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
3139  * is the default, the sound system handles rate and format conversions
3140  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
3141  * operates with 44100Hz/16bit/signed samples).
3142  *
3143  * Disabling cooked mode is intended for applications wanting to mmap()
3144  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
3145  * feeder architecture, presumably to gain as much control over audio
3146  * hardware as possible.
3147  *
3148  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
3149  * for more details.
3150  *
3151  * @param wrch          playback channel (optional; may be NULL)
3152  * @param rdch          recording channel (optional; may be NULL)
3153  * @param enabled       0 = raw mode, 1 = cooked mode
3154  *
3155  * @retval EINVAL       Operation not yet supported.
3156  */
3157 static int
3158 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
3159 {
3160
3161         /*
3162          * XXX I just don't get it. Why don't they call it
3163          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
3164          * This is just plain so confusing, incoherent,
3165          * <insert any non-printable characters here>.
3166          */
3167         if (!(enabled == 1 || enabled == 0))
3168                 return (EINVAL);
3169
3170         /*
3171          * I won't give in. I'm inverting its logic here and now.
3172          * Brag all you want, but "BITPERFECT" should be the better
3173          * term here.
3174          */
3175         enabled ^= 0x00000001;
3176
3177         if (wrch != NULL) {
3178                 CHN_LOCK(wrch);
3179                 wrch->flags &= ~CHN_F_BITPERFECT;
3180                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3181                 CHN_UNLOCK(wrch);
3182         }
3183
3184         if (rdch != NULL) {
3185                 CHN_LOCK(rdch);
3186                 rdch->flags &= ~CHN_F_BITPERFECT;
3187                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
3188                 CHN_UNLOCK(rdch);
3189         }
3190
3191         return (0);
3192 }
3193
3194 /**
3195  * @brief Retrieve channel interleaving order
3196  *
3197  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
3198  *
3199  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
3200  * for more details.
3201  *
3202  * @note As the ioctl definition is still under construction, FreeBSD
3203  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
3204  *
3205  * @param wrch  playback channel (optional; may be NULL)
3206  * @param rdch  recording channel (optional; may be NULL)
3207  * @param map   channel map (result will be stored there)
3208  *
3209  * @retval EINVAL       Operation not yet supported.
3210  */
3211 static int
3212 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3213 {
3214         struct pcm_channel *ch;
3215         int ret;
3216
3217         ch = (wrch != NULL) ? wrch : rdch;
3218         if (ch != NULL) {
3219                 CHN_LOCK(ch);
3220                 ret = chn_oss_getorder(ch, map);
3221                 CHN_UNLOCK(ch);
3222         } else
3223                 ret = EINVAL;
3224
3225         return (ret);
3226 }
3227
3228 /**
3229  * @brief Specify channel interleaving order
3230  *
3231  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
3232  *
3233  * @note As the ioctl definition is still under construction, FreeBSD
3234  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
3235  *
3236  * @param wrch  playback channel (optional; may be NULL)
3237  * @param rdch  recording channel (optional; may be NULL)
3238  * @param map   channel map
3239  *
3240  * @retval EINVAL       Operation not yet supported.
3241  */
3242 static int
3243 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
3244 {
3245         int ret;
3246
3247         ret = 0;
3248
3249         if (wrch != NULL) {
3250                 CHN_LOCK(wrch);
3251                 ret = chn_oss_setorder(wrch, map);
3252                 CHN_UNLOCK(wrch);
3253         }
3254
3255         if (ret == 0 && rdch != NULL) {
3256                 CHN_LOCK(rdch);
3257                 ret = chn_oss_setorder(rdch, map);
3258                 CHN_UNLOCK(rdch);
3259         }
3260
3261         return (ret);
3262 }
3263
3264 static int
3265 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
3266     int *mask)
3267 {
3268         struct pcm_channel *ch;
3269         uint32_t chnmask;
3270         int ret;
3271
3272         chnmask = 0;
3273         ch = (wrch != NULL) ? wrch : rdch;
3274
3275         if (ch != NULL) {
3276                 CHN_LOCK(ch);
3277                 ret = chn_oss_getmask(ch, &chnmask);
3278                 CHN_UNLOCK(ch);
3279         } else
3280                 ret = EINVAL;
3281
3282         if (ret == 0)
3283                 *mask = chnmask;
3284
3285         return (ret);
3286 }
3287
3288 #ifdef OSSV4_EXPERIMENT
3289 /**
3290  * @brief Retrieve an audio device's label
3291  *
3292  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
3293  *
3294  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3295  * for more details.
3296  *
3297  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
3298  * consoles) can show variable "labels" for certain controls. By default
3299  * the application name (say quake) is shown as the label but
3300  * applications may change the labels themselves."
3301  *
3302  * @note As the ioctl definition is still under construction, FreeBSD
3303  *       does not currently support @c SNDCTL_GETLABEL.
3304  *
3305  * @param wrch  playback channel (optional; may be NULL)
3306  * @param rdch  recording channel (optional; may be NULL)
3307  * @param label label gets copied here
3308  *
3309  * @retval EINVAL       Operation not yet supported.
3310  */
3311 static int
3312 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3313 {
3314         return (EINVAL);
3315 }
3316
3317 /**
3318  * @brief Specify an audio device's label
3319  *
3320  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
3321  * comments for @c dsp_oss_getlabel immediately above.
3322  *
3323  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
3324  * for more details.
3325  *
3326  * @note As the ioctl definition is still under construction, FreeBSD
3327  *       does not currently support SNDCTL_SETLABEL.
3328  *
3329  * @param wrch  playback channel (optional; may be NULL)
3330  * @param rdch  recording channel (optional; may be NULL)
3331  * @param label label gets copied from here
3332  *
3333  * @retval EINVAL       Operation not yet supported.
3334  */
3335 static int
3336 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
3337 {
3338         return (EINVAL);
3339 }
3340
3341 /**
3342  * @brief Retrieve name of currently played song
3343  *
3344  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
3345  * tell the system the name of the currently playing song, which would be
3346  * visible in @c /dev/sndstat.
3347  *
3348  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
3349  * for more details.
3350  *
3351  * @note As the ioctl definition is still under construction, FreeBSD
3352  *       does not currently support SNDCTL_GETSONG.
3353  *
3354  * @param wrch  playback channel (optional; may be NULL)
3355  * @param rdch  recording channel (optional; may be NULL)
3356  * @param song  song name gets copied here
3357  *
3358  * @retval EINVAL       Operation not yet supported.
3359  */
3360 static int
3361 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3362 {
3363         return (EINVAL);
3364 }
3365
3366 /**
3367  * @brief Retrieve name of currently played song
3368  *
3369  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
3370  * tell the system the name of the currently playing song, which would be
3371  * visible in @c /dev/sndstat.
3372  *
3373  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
3374  * for more details.
3375  *
3376  * @note As the ioctl definition is still under construction, FreeBSD
3377  *       does not currently support SNDCTL_SETSONG.
3378  *
3379  * @param wrch  playback channel (optional; may be NULL)
3380  * @param rdch  recording channel (optional; may be NULL)
3381  * @param song  song name gets copied from here
3382  *
3383  * @retval EINVAL       Operation not yet supported.
3384  */
3385 static int
3386 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
3387 {
3388         return (EINVAL);
3389 }
3390
3391 /**
3392  * @brief Rename a device
3393  *
3394  * This is a handler for the @c SNDCTL_SETNAME ioctl.
3395  *
3396  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
3397  * more details.
3398  *
3399  * From Hannu@4Front:  "This call is used to change the device name
3400  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
3401  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
3402  * name depending on the current context (for example 'OSS virtual wave table
3403  * synth' or 'VoIP link to London')."
3404  *
3405  * @note As the ioctl definition is still under construction, FreeBSD
3406  *       does not currently support SNDCTL_SETNAME.
3407  *
3408  * @param wrch  playback channel (optional; may be NULL)
3409  * @param rdch  recording channel (optional; may be NULL)
3410  * @param name  new device name gets copied from here
3411  *
3412  * @retval EINVAL       Operation not yet supported.
3413  */
3414 static int
3415 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
3416 {
3417         return (EINVAL);
3418 }
3419 #endif  /* !OSSV4_EXPERIMENT */