The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/dsp.c

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    1 /*-
    2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 #include <sys/ctype.h>
   29 
   30 #include <vm/vm.h>
   31 #include <vm/vm_object.h>
   32 #include <vm/vm_page.h>
   33 #include <vm/vm_pager.h>
   34 
   35 SND_DECLARE_FILE("$FreeBSD: stable/7/sys/dev/sound/pcm/dsp.c 227107 2011-11-05 11:18:46Z avg $");
   36 
   37 static int dsp_mmap_allow_prot_exec = 0;
   38 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
   39     &dsp_mmap_allow_prot_exec, 0, "linux mmap compatibility");
   40 
   41 struct dsp_cdevinfo {
   42         struct pcm_channel *rdch, *wrch;
   43         int busy, simplex;
   44         TAILQ_ENTRY(dsp_cdevinfo) link;
   45 };
   46 
   47 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
   48 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
   49 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
   50 
   51 #define DSP_CDEVINFO_CACHESIZE  8
   52 
   53 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
   54                                  (y) != NULL && (y)->si_drv1 != NULL)
   55 
   56 #define OLDPCM_IOCTL
   57 
   58 static d_open_t dsp_open;
   59 static d_close_t dsp_close;
   60 static d_read_t dsp_read;
   61 static d_write_t dsp_write;
   62 static d_ioctl_t dsp_ioctl;
   63 static d_poll_t dsp_poll;
   64 static d_mmap_t dsp_mmap;
   65 static d_mmap_single_t dsp_mmap_single;
   66 
   67 struct cdevsw dsp_cdevsw = {
   68         .d_version =    D_VERSION,
   69         .d_open =       dsp_open,
   70         .d_close =      dsp_close,
   71         .d_read =       dsp_read,
   72         .d_write =      dsp_write,
   73         .d_ioctl =      dsp_ioctl,
   74         .d_poll =       dsp_poll,
   75         .d_mmap =       dsp_mmap,
   76         .d_mmap_single = dsp_mmap_single,
   77         .d_name =       "dsp",
   78 };
   79 
   80 #ifdef USING_DEVFS
   81 static eventhandler_tag dsp_ehtag = NULL;
   82 static int dsp_umax = -1;
   83 static int dsp_cmax = -1;
   84 #endif
   85 
   86 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
   87 static int dsp_oss_syncstart(int sg_id);
   88 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
   89 #ifdef OSSV4_EXPERIMENT
   90 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
   91 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
   92 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
   93 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
   94 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
   95 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
   96 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
   97 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
   98 #endif
   99 
  100 static struct snddev_info *
  101 dsp_get_info(struct cdev *dev)
  102 {
  103         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
  104 }
  105 
  106 static uint32_t
  107 dsp_get_flags(struct cdev *dev)
  108 {
  109         device_t bdev;
  110 
  111         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  112 
  113         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
  114 }
  115 
  116 static void
  117 dsp_set_flags(struct cdev *dev, uint32_t flags)
  118 {
  119         device_t bdev;
  120 
  121         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  122 
  123         if (bdev != NULL)
  124                 pcm_setflags(bdev, flags);
  125 }
  126 
  127 /*
  128  * return the channels associated with an open device instance.
  129  * lock channels specified.
  130  */
  131 static int
  132 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
  133     uint32_t prio)
  134 {
  135         struct snddev_info *d;
  136         struct pcm_channel *ch;
  137         uint32_t flags;
  138 
  139         if (PCM_SIMPLEX(dev) != 0) {
  140                 d = dsp_get_info(dev);
  141                 if (!PCM_REGISTERED(d))
  142                         return (ENXIO);
  143                 pcm_lock(d);
  144                 PCM_WAIT(d);
  145                 PCM_ACQUIRE(d);
  146                 /*
  147                  * Note: order is important -
  148                  *       pcm flags -> prio query flags -> wild guess
  149                  */
  150                 ch = NULL;
  151                 flags = dsp_get_flags(dev);
  152                 if (flags & SD_F_PRIO_WR) {
  153                         ch = PCM_RDCH(dev);
  154                         PCM_RDCH(dev) = NULL;
  155                 } else if (flags & SD_F_PRIO_RD) {
  156                         ch = PCM_WRCH(dev);
  157                         PCM_WRCH(dev) = NULL;
  158                 } else if (prio & SD_F_PRIO_WR) {
  159                         ch = PCM_RDCH(dev);
  160                         PCM_RDCH(dev) = NULL;
  161                         flags |= SD_F_PRIO_WR;
  162                 } else if (prio & SD_F_PRIO_RD) {
  163                         ch = PCM_WRCH(dev);
  164                         PCM_WRCH(dev) = NULL;
  165                         flags |= SD_F_PRIO_RD;
  166                 } else if (PCM_WRCH(dev) != NULL) {
  167                         ch = PCM_RDCH(dev);
  168                         PCM_RDCH(dev) = NULL;
  169                         flags |= SD_F_PRIO_WR;
  170                 } else if (PCM_RDCH(dev) != NULL) {
  171                         ch = PCM_WRCH(dev);
  172                         PCM_WRCH(dev) = NULL;
  173                         flags |= SD_F_PRIO_RD;
  174                 }
  175                 PCM_SIMPLEX(dev) = 0;
  176                 dsp_set_flags(dev, flags);
  177                 if (ch != NULL) {
  178                         CHN_LOCK(ch);
  179                         pcm_chnref(ch, -1);
  180                         pcm_chnrelease(ch);
  181                 }
  182                 PCM_RELEASE(d);
  183                 pcm_unlock(d);
  184         }
  185 
  186         *rdch = PCM_RDCH(dev);
  187         *wrch = PCM_WRCH(dev);
  188 
  189         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
  190                 CHN_LOCK(*rdch);
  191         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
  192                 CHN_LOCK(*wrch);
  193 
  194         return (0);
  195 }
  196 
  197 /* unlock specified channels */
  198 static void
  199 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
  200     uint32_t prio)
  201 {
  202         if (wrch != NULL && (prio & SD_F_PRIO_WR))
  203                 CHN_UNLOCK(wrch);
  204         if (rdch != NULL && (prio & SD_F_PRIO_RD))
  205                 CHN_UNLOCK(rdch);
  206 }
  207 
  208 static void
  209 dsp_cdevinfo_alloc(struct cdev *dev,
  210     struct pcm_channel *rdch, struct pcm_channel *wrch)
  211 {
  212         struct snddev_info *d;
  213         struct dsp_cdevinfo *cdi;
  214         int simplex;
  215 
  216         d = dsp_get_info(dev);
  217 
  218         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
  219             rdch != wrch,
  220             ("bogus %s(), what are you trying to accomplish here?", __func__));
  221         PCM_BUSYASSERT(d);
  222         mtx_assert(d->lock, MA_OWNED);
  223 
  224         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
  225 
  226         /*
  227          * Scan for free instance entry and put it into the end of list.
  228          * Create new one if necessary.
  229          */
  230         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
  231                 if (cdi->busy != 0)
  232                         break;
  233                 cdi->rdch = rdch;
  234                 cdi->wrch = wrch;
  235                 cdi->simplex = simplex;
  236                 cdi->busy = 1;
  237                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  238                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  239                 dev->si_drv1 = cdi;
  240                 return;
  241         }
  242         pcm_unlock(d);
  243         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  244         pcm_lock(d);
  245         cdi->rdch = rdch;
  246         cdi->wrch = wrch;
  247         cdi->simplex = simplex;
  248         cdi->busy = 1;
  249         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  250         dev->si_drv1 = cdi;
  251 }
  252 
  253 static void
  254 dsp_cdevinfo_free(struct cdev *dev)
  255 {
  256         struct snddev_info *d;
  257         struct dsp_cdevinfo *cdi, *tmp;
  258         uint32_t flags;
  259         int i;
  260 
  261         d = dsp_get_info(dev);
  262 
  263         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
  264             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL,
  265             ("bogus %s(), what are you trying to accomplish here?", __func__));
  266         PCM_BUSYASSERT(d);
  267         mtx_assert(d->lock, MA_OWNED);
  268 
  269         cdi = dev->si_drv1;
  270         dev->si_drv1 = NULL;
  271         cdi->rdch = NULL;
  272         cdi->wrch = NULL;
  273         cdi->simplex = 0;
  274         cdi->busy = 0;
  275 
  276         /*
  277          * Once it is free, move it back to the beginning of list for
  278          * faster new entry allocation.
  279          */
  280         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  281         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  282 
  283         /*
  284          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
  285          * Reset simplex flags.
  286          */
  287         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
  288         i = DSP_CDEVINFO_CACHESIZE;
  289         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
  290                 if (cdi->busy != 0) {
  291                         if (cdi->simplex == 0) {
  292                                 if (cdi->rdch != NULL)
  293                                         flags |= SD_F_PRIO_RD;
  294                                 if (cdi->wrch != NULL)
  295                                         flags |= SD_F_PRIO_WR;
  296                         }
  297                 } else {
  298                         if (i == 0) {
  299                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  300                                 free(cdi, M_DEVBUF);
  301                         } else
  302                                 i--;
  303                 }
  304         }
  305         dsp_set_flags(dev, flags);
  306 }
  307 
  308 void
  309 dsp_cdevinfo_init(struct snddev_info *d)
  310 {
  311         struct dsp_cdevinfo *cdi;
  312         int i;
  313 
  314         KASSERT(d != NULL, ("NULL snddev_info"));
  315         PCM_BUSYASSERT(d);
  316         mtx_assert(d->lock, MA_NOTOWNED);
  317 
  318         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  319         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
  320                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  321                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  322         }
  323 }
  324 
  325 void
  326 dsp_cdevinfo_flush(struct snddev_info *d)
  327 {
  328         struct dsp_cdevinfo *cdi, *tmp;
  329 
  330         KASSERT(d != NULL, ("NULL snddev_info"));
  331         PCM_BUSYASSERT(d);
  332         mtx_assert(d->lock, MA_NOTOWNED);
  333 
  334         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
  335         while (cdi != NULL) {
  336                 tmp = TAILQ_NEXT(cdi, link);
  337                 free(cdi, M_DEVBUF);
  338                 cdi = tmp;
  339         }
  340         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  341 }
  342 
  343 /* duplex / simplex cdev type */
  344 enum {
  345         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
  346         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
  347         DSP_CDEV_TYPE_RDWR,             /* duplex read, write, or both  */
  348 };
  349 
  350 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
  351 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
  352 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
  353 #define DSP_F_READ(x)           ((x) & FREAD)
  354 #define DSP_F_WRITE(x)          ((x) & FWRITE)
  355 
  356 static const struct {
  357         int type;
  358         char *name;
  359         char *sep;
  360         int use_sep;
  361         int hw;
  362         int max;
  363         uint32_t fmt, spd;
  364         int query;
  365 } dsp_cdevs[] = {
  366         { SND_DEV_DSP,         "dsp",    ".", 0, 0, 0,
  367             AFMT_U8,       DSP_DEFAULT_SPEED, DSP_CDEV_TYPE_RDWR   },
  368         { SND_DEV_AUDIO,       "audio",  ".", 0, 0, 0,
  369             AFMT_MU_LAW,   DSP_DEFAULT_SPEED, DSP_CDEV_TYPE_RDWR   },
  370         { SND_DEV_DSP16,       "dspW",   ".", 0, 0, 0,
  371             AFMT_S16_LE,   DSP_DEFAULT_SPEED, DSP_CDEV_TYPE_RDWR   },
  372         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", 1, 1, SND_MAXHWCHAN,
  373             AFMT_S16_LE | AFMT_STEREO, 48000, DSP_CDEV_TYPE_WRONLY },
  374         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", 1, 1, SND_MAXVCHANS,
  375             AFMT_S16_LE | AFMT_STEREO, 48000, DSP_CDEV_TYPE_WRONLY },
  376         { SND_DEV_DSPHW_REC,   "dsp",   ".r", 1, 1, SND_MAXHWCHAN,
  377             AFMT_S16_LE | AFMT_STEREO, 48000, DSP_CDEV_TYPE_RDONLY },
  378         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", 1, 1, SND_MAXVCHANS,
  379             AFMT_S16_LE | AFMT_STEREO, 48000, DSP_CDEV_TYPE_RDONLY },
  380         { SND_DEV_DSPHW_CD,    "dspcd",  ".", 0, 0, 0,
  381             AFMT_S16_LE | AFMT_STEREO, 44100, DSP_CDEV_TYPE_RDWR   },
  382         { SND_DEV_DSP_MMAP, "dsp_mmap",  ".", 0, 0, 0,
  383             AFMT_S16_LE | AFMT_STEREO, 48000, DSP_CDEV_TYPE_RDWR   },
  384 };
  385 
  386 #define DSP_FIXUP_ERROR()               do {                            \
  387         prio = dsp_get_flags(i_dev);                                    \
  388         if (!DSP_F_VALID(flags))                                        \
  389                 error = EINVAL;                                         \
  390         if (!DSP_F_DUPLEX(flags) &&                                     \
  391             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
  392             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
  393                 error = ENOTSUP;                                        \
  394         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
  395             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
  396             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
  397                 error = EBUSY;                                          \
  398         else if (DSP_REGISTERED(d, i_dev))                              \
  399                 error = EBUSY;                                          \
  400 } while(0)
  401 
  402 static int
  403 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  404 {
  405         struct pcm_channel *rdch, *wrch;
  406         struct snddev_info *d;
  407         uint32_t fmt, spd, prio;
  408         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
  409 
  410         /* Kind of impossible.. */
  411         if (i_dev == NULL || td == NULL)
  412                 return (ENODEV);
  413 
  414         d = dsp_get_info(i_dev);
  415         if (!PCM_REGISTERED(d))
  416                 return (EBADF);
  417 
  418         PCM_GIANT_ENTER(d);
  419 
  420         /* Lock snddev so nobody else can monkey with it. */
  421         pcm_lock(d);
  422         PCM_WAIT(d);
  423 
  424         /*
  425          * Try to acquire cloned device before someone else pick it.
  426          * ENODEV means this is not a cloned droids.
  427          */
  428         error = snd_clone_acquire(i_dev);
  429         if (!(error == 0 || error == ENODEV)) {
  430                 DSP_FIXUP_ERROR();
  431                 pcm_unlock(d);
  432                 PCM_GIANT_EXIT(d);
  433                 return (error);
  434         }
  435 
  436         error = 0;
  437         DSP_FIXUP_ERROR();
  438 
  439         if (error != 0) {
  440                 (void)snd_clone_release(i_dev);
  441                 pcm_unlock(d);
  442                 PCM_GIANT_EXIT(d);
  443                 return (error);
  444         }
  445 
  446         /*
  447          * That is just enough. Acquire and unlock pcm lock so
  448          * the other will just have to wait until we finish doing
  449          * everything.
  450          */
  451         PCM_ACQUIRE(d);
  452         pcm_unlock(d);
  453 
  454         devtype = PCMDEV(i_dev);
  455         wdevunit = -1;
  456         rdevunit = -1;
  457         fmt = 0;
  458         spd = 0;
  459 
  460         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
  461                 if (devtype != dsp_cdevs[i].type)
  462                         continue;
  463                 if (DSP_F_SIMPLEX(flags) &&
  464                     ((dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY &&
  465                     DSP_F_READ(flags)) ||
  466                     (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY &&
  467                     DSP_F_WRITE(flags)))) {
  468                         /*
  469                          * simplex, opposite direction? Please be gone..
  470                          */
  471                         (void)snd_clone_release(i_dev);
  472                         PCM_RELEASE_QUICK(d);
  473                         PCM_GIANT_EXIT(d);
  474                         return (ENOTSUP);
  475                 }
  476                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY)
  477                         wdevunit = dev2unit(i_dev);
  478                 else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY)
  479                         rdevunit = dev2unit(i_dev);
  480                 fmt = dsp_cdevs[i].fmt;
  481                 spd = dsp_cdevs[i].spd;
  482                 break;
  483         }
  484 
  485         /* No matching devtype? */
  486         if (fmt == 0 || spd == 0)
  487                 panic("impossible devtype %d", devtype);
  488 
  489         rdch = NULL;
  490         wrch = NULL;
  491         rderror = 0;
  492         wrerror = 0;
  493 
  494         /*
  495          * if we get here, the open request is valid- either:
  496          *   * we were previously not open
  497          *   * we were open for play xor record and the opener wants
  498          *     the non-open direction
  499          */
  500         if (DSP_F_READ(flags)) {
  501                 /* open for read */
  502                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
  503                     td->td_proc->p_pid, rdevunit);
  504 
  505                 if (rderror == 0 && (chn_reset(rdch, fmt) != 0 ||
  506                     (chn_setspeed(rdch, spd) != 0)))
  507                         rderror = ENXIO;
  508 
  509                 if (rderror != 0) {
  510                         if (rdch != NULL)
  511                                 pcm_chnrelease(rdch);
  512                         if (!DSP_F_DUPLEX(flags)) {
  513                                 (void)snd_clone_release(i_dev);
  514                                 PCM_RELEASE_QUICK(d);
  515                                 PCM_GIANT_EXIT(d);
  516                                 return (rderror);
  517                         }
  518                         rdch = NULL;
  519                 } else {
  520                         if (flags & O_NONBLOCK)
  521                                 rdch->flags |= CHN_F_NBIO;
  522                         pcm_chnref(rdch, 1);
  523                         CHN_UNLOCK(rdch);
  524                 }
  525         }
  526 
  527         if (DSP_F_WRITE(flags)) {
  528                 /* open for write */
  529                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
  530                     td->td_proc->p_pid, wdevunit);
  531 
  532                 if (wrerror == 0 && (chn_reset(wrch, fmt) != 0 ||
  533                     (chn_setspeed(wrch, spd) != 0)))
  534                         wrerror = ENXIO;
  535 
  536                 if (wrerror != 0) {
  537                         if (wrch != NULL)
  538                                 pcm_chnrelease(wrch);
  539                         if (!DSP_F_DUPLEX(flags)) {
  540                                 if (rdch != NULL) {
  541                                         /*
  542                                          * Lock, deref and release previously
  543                                          * created record channel
  544                                          */
  545                                         CHN_LOCK(rdch);
  546                                         pcm_chnref(rdch, -1);
  547                                         pcm_chnrelease(rdch);
  548                                 }
  549                                 (void)snd_clone_release(i_dev);
  550                                 PCM_RELEASE_QUICK(d);
  551                                 PCM_GIANT_EXIT(d);
  552                                 return (wrerror);
  553                         }
  554                         wrch = NULL;
  555                 } else {
  556                         if (flags & O_NONBLOCK)
  557                                 wrch->flags |= CHN_F_NBIO;
  558                         pcm_chnref(wrch, 1);
  559                         CHN_UNLOCK(wrch);
  560                 }
  561         }
  562 
  563         if (rdch == NULL && wrch == NULL) {
  564                 (void)snd_clone_release(i_dev);
  565                 PCM_RELEASE_QUICK(d);
  566                 PCM_GIANT_EXIT(d);
  567                 return ((wrerror != 0) ? wrerror : rderror);
  568         }
  569 
  570         pcm_lock(d);
  571 
  572         /*
  573          * We're done. Allocate channels information for this cdev.
  574          */
  575         dsp_cdevinfo_alloc(i_dev, rdch, wrch);
  576 
  577         /*
  578          * Increase clone refcount for its automatic garbage collector.
  579          */
  580         (void)snd_clone_ref(i_dev);
  581 
  582         PCM_RELEASE(d);
  583         pcm_unlock(d);
  584 
  585         PCM_GIANT_LEAVE(d);
  586 
  587         return (0);
  588 }
  589 
  590 static int
  591 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  592 {
  593         struct pcm_channel *rdch, *wrch;
  594         struct snddev_info *d;
  595         int sg_ids, refs;
  596 
  597         d = dsp_get_info(i_dev);
  598         if (!DSP_REGISTERED(d, i_dev))
  599                 return (EBADF);
  600 
  601         PCM_GIANT_ENTER(d);
  602 
  603         pcm_lock(d);
  604         PCM_WAIT(d);
  605 
  606         rdch = PCM_RDCH(i_dev);
  607         wrch = PCM_WRCH(i_dev);
  608 
  609         if (rdch || wrch) {
  610                 PCM_ACQUIRE(d);
  611                 pcm_unlock(d);
  612 
  613                 refs = 0;
  614                 if (rdch) {
  615                         /*
  616                          * The channel itself need not be locked because:
  617                          *   a)  Adding a channel to a syncgroup happens only in dsp_ioctl(),
  618                          *       which cannot run concurrently to dsp_close().
  619                          *   b)  The syncmember pointer (sm) is protected by the global
  620                          *       syncgroup list lock.
  621                          *   c)  A channel can't just disappear, invalidating pointers,
  622                          *       unless it's closed/dereferenced first.
  623                          */
  624                         PCM_SG_LOCK();
  625                         sg_ids = chn_syncdestroy(rdch);
  626                         PCM_SG_UNLOCK();
  627                         if (sg_ids != 0)
  628                                 free_unr(pcmsg_unrhdr, sg_ids);
  629 
  630                         CHN_LOCK(rdch);
  631                         refs += pcm_chnref(rdch, -1);
  632                         chn_abort(rdch); /* won't sleep */
  633                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MAPPED | CHN_F_DEAD);
  634                         chn_reset(rdch, 0);
  635                         pcm_chnrelease(rdch);
  636                         PCM_RDCH(i_dev) = NULL;
  637                 }
  638                 if (wrch) {
  639                         /*
  640                          * Please see block above.
  641                          */
  642                         PCM_SG_LOCK();
  643                         sg_ids = chn_syncdestroy(wrch);
  644                         PCM_SG_UNLOCK();
  645                         if (sg_ids != 0)
  646                                 free_unr(pcmsg_unrhdr, sg_ids);
  647 
  648                         CHN_LOCK(wrch);
  649                         refs += pcm_chnref(wrch, -1);
  650                         chn_flush(wrch); /* may sleep */
  651                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MAPPED | CHN_F_DEAD);
  652                         chn_reset(wrch, 0);
  653                         pcm_chnrelease(wrch);
  654                         PCM_WRCH(i_dev) = NULL;
  655                 }
  656 
  657                 pcm_lock(d);
  658                 /*
  659                  * If there are no more references, release the channels.
  660                  */
  661                 if (refs == 0 && PCM_RDCH(i_dev) == NULL &&
  662                     PCM_WRCH(i_dev) == NULL) {
  663                         dsp_cdevinfo_free(i_dev);
  664                         /*
  665                          * Release clone busy state and unref it
  666                          * so the automatic garbage collector will
  667                          * get the hint and do the remaining cleanup
  668                          * process.
  669                          */
  670                         (void)snd_clone_release(i_dev);
  671 
  672                         /*
  673                          * destroy_dev() might sleep, so release pcm lock
  674                          * here and rely on pcm cv serialization.
  675                          */
  676                         pcm_unlock(d);
  677                         (void)snd_clone_unref(i_dev);
  678                         pcm_lock(d);
  679                 }
  680                 PCM_RELEASE(d);
  681         }
  682 
  683         pcm_unlock(d);
  684 
  685         PCM_GIANT_LEAVE(d);
  686 
  687         return (0);
  688 }
  689 
  690 static __inline int
  691 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
  692 {
  693         struct snddev_info *d;
  694         struct pcm_channel **ch, *rdch, *wrch;
  695         int (*chn_io)(struct pcm_channel *, struct uio *);
  696         int prio, ret;
  697         pid_t runpid;
  698 
  699         KASSERT(i_dev != NULL && buf != NULL &&
  700             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
  701             ("%s(): io train wreck!", __func__));
  702 
  703         d = dsp_get_info(i_dev);
  704         if (!DSP_REGISTERED(d, i_dev))
  705                 return (EBADF);
  706 
  707         PCM_GIANT_ENTER(d);
  708 
  709         switch (buf->uio_rw) {
  710         case UIO_READ:
  711                 prio = SD_F_PRIO_RD;
  712                 ch = &rdch;
  713                 chn_io = chn_read;
  714                 break;
  715         case UIO_WRITE:
  716                 prio = SD_F_PRIO_WR;
  717                 ch = &wrch;
  718                 chn_io = chn_write;
  719                 break;
  720         default:
  721                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
  722                 break;
  723         }
  724 
  725         rdch = NULL;
  726         wrch = NULL;
  727         runpid = buf->uio_td->td_proc->p_pid;
  728 
  729         getchns(i_dev, &rdch, &wrch, prio);
  730 
  731         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
  732                 PCM_GIANT_EXIT(d);
  733                 return (EBADF);
  734         }
  735 
  736         if (((*ch)->flags & (CHN_F_MAPPED | CHN_F_DEAD)) ||
  737             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
  738                 relchns(i_dev, rdch, wrch, prio);
  739                 PCM_GIANT_EXIT(d);
  740                 return (EINVAL);
  741         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
  742                 (*ch)->flags |= CHN_F_RUNNING;
  743                 (*ch)->pid = runpid;
  744         }
  745 
  746         /*
  747          * chn_read/write must give up channel lock in order to copy bytes
  748          * from/to userland, so up the "in progress" counter to make sure
  749          * someone else doesn't come along and muss up the buffer.
  750          */
  751         ++(*ch)->inprog;
  752         ret = chn_io(*ch, buf);
  753         --(*ch)->inprog;
  754 
  755         CHN_BROADCAST(&(*ch)->cv);
  756 
  757         relchns(i_dev, rdch, wrch, prio);
  758 
  759         PCM_GIANT_LEAVE(d);
  760 
  761         return (ret);
  762 }
  763 
  764 static int
  765 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
  766 {
  767         return (dsp_io_ops(i_dev, buf));
  768 }
  769 
  770 static int
  771 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
  772 {
  773         return (dsp_io_ops(i_dev, buf));
  774 }
  775 
  776 static int
  777 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
  778 {
  779         struct pcm_channel *chn, *rdch, *wrch;
  780         struct snddev_info *d;
  781         u_long xcmd;
  782         int *arg_i, ret, kill, tmp;
  783 
  784         d = dsp_get_info(i_dev);
  785         if (!DSP_REGISTERED(d, i_dev))
  786                 return (EBADF);
  787 
  788         PCM_GIANT_ENTER(d);
  789 
  790         arg_i = (int *)arg;
  791         ret = 0;
  792         xcmd = 0;
  793 
  794         /*
  795          * this is an evil hack to allow broken apps to perform mixer ioctls
  796          * on dsp devices.
  797          */
  798         if (IOCGROUP(cmd) == 'M') {
  799                 /*
  800                  * This is at least, a bug to bug compatible with OSS.
  801                  */
  802                 if (d->mixer_dev != NULL) {
  803                         PCM_ACQUIRE_QUICK(d);
  804                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
  805                             MIXER_CMD_DIRECT);
  806                         PCM_RELEASE_QUICK(d);
  807                 } else
  808                         ret = EBADF;
  809 
  810                 PCM_GIANT_EXIT(d);
  811 
  812                 return (ret);
  813         }
  814 
  815         /*
  816          * Certain ioctls may be made on any type of device (audio, mixer,
  817          * and MIDI).  Handle those special cases here.
  818          */
  819         if (IOCGROUP(cmd) == 'X') {
  820                 PCM_ACQUIRE_QUICK(d);
  821                 switch(cmd) {
  822                 case SNDCTL_SYSINFO:
  823                         sound_oss_sysinfo((oss_sysinfo *)arg);
  824                         break;
  825                 case SNDCTL_AUDIOINFO:
  826                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
  827                         break;
  828                 case SNDCTL_MIXERINFO:
  829                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
  830                         break;
  831                 default:
  832                         ret = EINVAL;
  833                 }
  834                 PCM_RELEASE_QUICK(d);
  835                 PCM_GIANT_EXIT(d);
  836                 return (ret);
  837         }
  838 
  839         getchns(i_dev, &rdch, &wrch, 0);
  840 
  841         kill = 0;
  842         if (wrch && (wrch->flags & CHN_F_DEAD))
  843                 kill |= 1;
  844         if (rdch && (rdch->flags & CHN_F_DEAD))
  845                 kill |= 2;
  846         if (kill == 3) {
  847                 relchns(i_dev, rdch, wrch, 0);
  848                 PCM_GIANT_EXIT(d);
  849                 return (EINVAL);
  850         }
  851         if (kill & 1)
  852                 wrch = NULL;
  853         if (kill & 2)
  854                 rdch = NULL;
  855 
  856         if (wrch == NULL && rdch == NULL) {
  857                 relchns(i_dev, rdch, wrch, 0);
  858                 PCM_GIANT_EXIT(d);
  859                 return (EINVAL);
  860         }
  861 
  862         switch(cmd) {
  863 #ifdef OLDPCM_IOCTL
  864         /*
  865          * we start with the new ioctl interface.
  866          */
  867         case AIONWRITE: /* how many bytes can write ? */
  868                 if (wrch) {
  869                         CHN_LOCK(wrch);
  870 /*
  871                 if (wrch && wrch->bufhard.dl)
  872                         while (chn_wrfeed(wrch) == 0);
  873 */
  874                         *arg_i = sndbuf_getfree(wrch->bufsoft);
  875                         CHN_UNLOCK(wrch);
  876                 } else {
  877                         *arg_i = 0;
  878                         ret = EINVAL;
  879                 }
  880                 break;
  881 
  882         case AIOSSIZE:     /* set the current blocksize */
  883                 {
  884                         struct snd_size *p = (struct snd_size *)arg;
  885 
  886                         p->play_size = 0;
  887                         p->rec_size = 0;
  888                         PCM_ACQUIRE_QUICK(d);
  889                         if (wrch) {
  890                                 CHN_LOCK(wrch);
  891                                 chn_setblocksize(wrch, 2, p->play_size);
  892                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
  893                                 CHN_UNLOCK(wrch);
  894                         }
  895                         if (rdch) {
  896                                 CHN_LOCK(rdch);
  897                                 chn_setblocksize(rdch, 2, p->rec_size);
  898                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
  899                                 CHN_UNLOCK(rdch);
  900                         }
  901                         PCM_RELEASE_QUICK(d);
  902                 }
  903                 break;
  904         case AIOGSIZE:  /* get the current blocksize */
  905                 {
  906                         struct snd_size *p = (struct snd_size *)arg;
  907 
  908                         if (wrch) {
  909                                 CHN_LOCK(wrch);
  910                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
  911                                 CHN_UNLOCK(wrch);
  912                         }
  913                         if (rdch) {
  914                                 CHN_LOCK(rdch);
  915                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
  916                                 CHN_UNLOCK(rdch);
  917                         }
  918                 }
  919                 break;
  920 
  921         case AIOSFMT:
  922         case AIOGFMT:
  923                 {
  924                         snd_chan_param *p = (snd_chan_param *)arg;
  925 
  926                         if (cmd == AIOSFMT &&
  927                             ((p->play_format != 0 && p->play_rate == 0) ||
  928                             (p->rec_format != 0 && p->rec_rate == 0))) {
  929                                 ret = EINVAL;
  930                                 break;
  931                         }
  932                         PCM_ACQUIRE_QUICK(d);
  933                         if (wrch) {
  934                                 CHN_LOCK(wrch);
  935                                 if (cmd == AIOSFMT && p->play_format != 0) {
  936                                         chn_setformat(wrch, p->play_format);
  937                                         chn_setspeed(wrch, p->play_rate);
  938                                 }
  939                                 p->play_rate = wrch->speed;
  940                                 p->play_format = wrch->format;
  941                                 CHN_UNLOCK(wrch);
  942                         } else {
  943                                 p->play_rate = 0;
  944                                 p->play_format = 0;
  945                         }
  946                         if (rdch) {
  947                                 CHN_LOCK(rdch);
  948                                 if (cmd == AIOSFMT && p->rec_format != 0) {
  949                                         chn_setformat(rdch, p->rec_format);
  950                                         chn_setspeed(rdch, p->rec_rate);
  951                                 }
  952                                 p->rec_rate = rdch->speed;
  953                                 p->rec_format = rdch->format;
  954                                 CHN_UNLOCK(rdch);
  955                         } else {
  956                                 p->rec_rate = 0;
  957                                 p->rec_format = 0;
  958                         }
  959                         PCM_RELEASE_QUICK(d);
  960                 }
  961                 break;
  962 
  963         case AIOGCAP:     /* get capabilities */
  964                 {
  965                         snd_capabilities *p = (snd_capabilities *)arg;
  966                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
  967                         struct cdev *pdev;
  968 
  969                         pcm_lock(d);
  970                         if (rdch) {
  971                                 CHN_LOCK(rdch);
  972                                 rcaps = chn_getcaps(rdch);
  973                         }
  974                         if (wrch) {
  975                                 CHN_LOCK(wrch);
  976                                 pcaps = chn_getcaps(wrch);
  977                         }
  978                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
  979                                           pcaps? pcaps->minspeed : 0);
  980                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
  981                                           pcaps? pcaps->maxspeed : 1000000);
  982                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
  983                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
  984                         /* XXX bad on sb16 */
  985                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
  986                                      (wrch? chn_getformats(wrch) : 0xffffffff);
  987                         if (rdch && wrch)
  988                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
  989                         pdev = d->mixer_dev;
  990                         p->mixers = 1; /* default: one mixer */
  991                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
  992                         p->left = p->right = 100;
  993                         if (wrch)
  994                                 CHN_UNLOCK(wrch);
  995                         if (rdch)
  996                                 CHN_UNLOCK(rdch);
  997                         pcm_unlock(d);
  998                 }
  999                 break;
 1000 
 1001         case AIOSTOP:
 1002                 if (*arg_i == AIOSYNC_PLAY && wrch) {
 1003                         CHN_LOCK(wrch);
 1004                         *arg_i = chn_abort(wrch);
 1005                         CHN_UNLOCK(wrch);
 1006                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
 1007                         CHN_LOCK(rdch);
 1008                         *arg_i = chn_abort(rdch);
 1009                         CHN_UNLOCK(rdch);
 1010                 } else {
 1011                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 1012                         *arg_i = 0;
 1013                 }
 1014                 break;
 1015 
 1016         case AIOSYNC:
 1017                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
 1018                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
 1019                 break;
 1020 #endif
 1021         /*
 1022          * here follow the standard ioctls (filio.h etc.)
 1023          */
 1024         case FIONREAD: /* get # bytes to read */
 1025                 if (rdch) {
 1026                         CHN_LOCK(rdch);
 1027 /*                      if (rdch && rdch->bufhard.dl)
 1028                                 while (chn_rdfeed(rdch) == 0);
 1029 */
 1030                         *arg_i = sndbuf_getready(rdch->bufsoft);
 1031                         CHN_UNLOCK(rdch);
 1032                 } else {
 1033                         *arg_i = 0;
 1034                         ret = EINVAL;
 1035                 }
 1036                 break;
 1037 
 1038         case FIOASYNC: /*set/clear async i/o */
 1039                 DEB( printf("FIOASYNC\n") ; )
 1040                 break;
 1041 
 1042         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
 1043         case FIONBIO: /* set/clear non-blocking i/o */
 1044                 if (rdch) {
 1045                         CHN_LOCK(rdch);
 1046                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1047                                 rdch->flags |= CHN_F_NBIO;
 1048                         else
 1049                                 rdch->flags &= ~CHN_F_NBIO;
 1050                         CHN_UNLOCK(rdch);
 1051                 }
 1052                 if (wrch) {
 1053                         CHN_LOCK(wrch);
 1054                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1055                                 wrch->flags |= CHN_F_NBIO;
 1056                         else
 1057                                 wrch->flags &= ~CHN_F_NBIO;
 1058                         CHN_UNLOCK(wrch);
 1059                 }
 1060                 break;
 1061 
 1062         /*
 1063          * Finally, here is the linux-compatible ioctl interface
 1064          */
 1065 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
 1066         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
 1067         case SNDCTL_DSP_GETBLKSIZE:
 1068                 chn = wrch ? wrch : rdch;
 1069                 if (chn) {
 1070                         CHN_LOCK(chn);
 1071                         *arg_i = sndbuf_getblksz(chn->bufsoft);
 1072                         CHN_UNLOCK(chn);
 1073                 } else {
 1074                         *arg_i = 0;
 1075                         ret = EINVAL;
 1076                 }
 1077                 break;
 1078 
 1079         case SNDCTL_DSP_SETBLKSIZE:
 1080                 RANGE(*arg_i, 16, 65536);
 1081                 PCM_ACQUIRE_QUICK(d);
 1082                 if (wrch) {
 1083                         CHN_LOCK(wrch);
 1084                         chn_setblocksize(wrch, 2, *arg_i);
 1085                         CHN_UNLOCK(wrch);
 1086                 }
 1087                 if (rdch) {
 1088                         CHN_LOCK(rdch);
 1089                         chn_setblocksize(rdch, 2, *arg_i);
 1090                         CHN_UNLOCK(rdch);
 1091                 }
 1092                 PCM_RELEASE_QUICK(d);
 1093                 break;
 1094 
 1095         case SNDCTL_DSP_RESET:
 1096                 DEB(printf("dsp reset\n"));
 1097                 if (wrch) {
 1098                         CHN_LOCK(wrch);
 1099                         chn_abort(wrch);
 1100                         chn_resetbuf(wrch);
 1101                         CHN_UNLOCK(wrch);
 1102                 }
 1103                 if (rdch) {
 1104                         CHN_LOCK(rdch);
 1105                         chn_abort(rdch);
 1106                         chn_resetbuf(rdch);
 1107                         CHN_UNLOCK(rdch);
 1108                 }
 1109                 break;
 1110 
 1111         case SNDCTL_DSP_SYNC:
 1112                 DEB(printf("dsp sync\n"));
 1113                 /* chn_sync may sleep */
 1114                 if (wrch) {
 1115                         CHN_LOCK(wrch);
 1116                         chn_sync(wrch, 0);
 1117                         CHN_UNLOCK(wrch);
 1118                 }
 1119                 break;
 1120 
 1121         case SNDCTL_DSP_SPEED:
 1122                 /* chn_setspeed may sleep */
 1123                 tmp = 0;
 1124                 PCM_ACQUIRE_QUICK(d);
 1125                 if (wrch) {
 1126                         CHN_LOCK(wrch);
 1127                         ret = chn_setspeed(wrch, *arg_i);
 1128                         tmp = wrch->speed;
 1129                         CHN_UNLOCK(wrch);
 1130                 }
 1131                 if (rdch && ret == 0) {
 1132                         CHN_LOCK(rdch);
 1133                         ret = chn_setspeed(rdch, *arg_i);
 1134                         if (tmp == 0)
 1135                                 tmp = rdch->speed;
 1136                         CHN_UNLOCK(rdch);
 1137                 }
 1138                 PCM_RELEASE_QUICK(d);
 1139                 *arg_i = tmp;
 1140                 break;
 1141 
 1142         case SOUND_PCM_READ_RATE:
 1143                 chn = wrch ? wrch : rdch;
 1144                 if (chn) {
 1145                         CHN_LOCK(chn);
 1146                         *arg_i = chn->speed;
 1147                         CHN_UNLOCK(chn);
 1148                 } else {
 1149                         *arg_i = 0;
 1150                         ret = EINVAL;
 1151                 }
 1152                 break;
 1153 
 1154         case SNDCTL_DSP_STEREO:
 1155                 tmp = -1;
 1156                 *arg_i = (*arg_i)? AFMT_STEREO : 0;
 1157                 PCM_ACQUIRE_QUICK(d);
 1158                 if (wrch) {
 1159                         CHN_LOCK(wrch);
 1160                         ret = chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | *arg_i);
 1161                         tmp = (wrch->format & AFMT_STEREO)? 1 : 0;
 1162                         CHN_UNLOCK(wrch);
 1163                 }
 1164                 if (rdch && ret == 0) {
 1165                         CHN_LOCK(rdch);
 1166                         ret = chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | *arg_i);
 1167                         if (tmp == -1)
 1168                                 tmp = (rdch->format & AFMT_STEREO)? 1 : 0;
 1169                         CHN_UNLOCK(rdch);
 1170                 }
 1171                 PCM_RELEASE_QUICK(d);
 1172                 *arg_i = tmp;
 1173                 break;
 1174 
 1175         case SOUND_PCM_WRITE_CHANNELS:
 1176 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
 1177                 if (*arg_i != 0) {
 1178                         tmp = 0;
 1179                         *arg_i = (*arg_i != 1)? AFMT_STEREO : 0;
 1180                         PCM_ACQUIRE_QUICK(d);
 1181                         if (wrch) {
 1182                                 CHN_LOCK(wrch);
 1183                                 ret = chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | *arg_i);
 1184                                 tmp = (wrch->format & AFMT_STEREO)? 2 : 1;
 1185                                 CHN_UNLOCK(wrch);
 1186                         }
 1187                         if (rdch && ret == 0) {
 1188                                 CHN_LOCK(rdch);
 1189                                 ret = chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | *arg_i);
 1190                                 if (tmp == 0)
 1191                                         tmp = (rdch->format & AFMT_STEREO)? 2 : 1;
 1192                                 CHN_UNLOCK(rdch);
 1193                         }
 1194                         PCM_RELEASE_QUICK(d);
 1195                         *arg_i = tmp;
 1196                 } else {
 1197                         chn = wrch ? wrch : rdch;
 1198                         CHN_LOCK(chn);
 1199                         *arg_i = (chn->format & AFMT_STEREO) ? 2 : 1;
 1200                         CHN_UNLOCK(chn);
 1201                 }
 1202                 break;
 1203 
 1204         case SOUND_PCM_READ_CHANNELS:
 1205                 chn = wrch ? wrch : rdch;
 1206                 if (chn) {
 1207                         CHN_LOCK(chn);
 1208                         *arg_i = (chn->format & AFMT_STEREO) ? 2 : 1;
 1209                         CHN_UNLOCK(chn);
 1210                 } else {
 1211                         *arg_i = 0;
 1212                         ret = EINVAL;
 1213                 }
 1214                 break;
 1215 
 1216         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
 1217                 chn = wrch ? wrch : rdch;
 1218                 if (chn) {
 1219                         CHN_LOCK(chn);
 1220                         *arg_i = chn_getformats(chn);
 1221                         CHN_UNLOCK(chn);
 1222                 } else {
 1223                         *arg_i = 0;
 1224                         ret = EINVAL;
 1225                 }
 1226                 break;
 1227 
 1228         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
 1229                 if ((*arg_i != AFMT_QUERY)) {
 1230                         tmp = 0;
 1231                         PCM_ACQUIRE_QUICK(d);
 1232                         if (wrch) {
 1233                                 CHN_LOCK(wrch);
 1234                                 ret = chn_setformat(wrch, (*arg_i) | (wrch->format & AFMT_STEREO));
 1235                                 tmp = wrch->format & ~AFMT_STEREO;
 1236                                 CHN_UNLOCK(wrch);
 1237                         }
 1238                         if (rdch && ret == 0) {
 1239                                 CHN_LOCK(rdch);
 1240                                 ret = chn_setformat(rdch, (*arg_i) | (rdch->format & AFMT_STEREO));
 1241                                 if (tmp == 0)
 1242                                         tmp = rdch->format & ~AFMT_STEREO;
 1243                                 CHN_UNLOCK(rdch);
 1244                         }
 1245                         PCM_RELEASE_QUICK(d);
 1246                         *arg_i = tmp;
 1247                 } else {
 1248                         chn = wrch ? wrch : rdch;
 1249                         CHN_LOCK(chn);
 1250                         *arg_i = chn->format & ~AFMT_STEREO;
 1251                         CHN_UNLOCK(chn);
 1252                 }
 1253                 break;
 1254 
 1255         case SNDCTL_DSP_SETFRAGMENT:
 1256                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
 1257                 {
 1258                         uint32_t fragln = (*arg_i) & 0x0000ffff;
 1259                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
 1260                         uint32_t fragsz;
 1261                         uint32_t r_maxfrags, r_fragsz;
 1262 
 1263                         RANGE(fragln, 4, 16);
 1264                         fragsz = 1 << fragln;
 1265 
 1266                         if (maxfrags == 0)
 1267                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1268                         if (maxfrags < 2)
 1269                                 maxfrags = 2;
 1270                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
 1271                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1272 
 1273                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
 1274                         PCM_ACQUIRE_QUICK(d);
 1275                         if (rdch) {
 1276                                 CHN_LOCK(rdch);
 1277                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
 1278                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
 1279                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
 1280                                 CHN_UNLOCK(rdch);
 1281                         } else {
 1282                                 r_maxfrags = maxfrags;
 1283                                 r_fragsz = fragsz;
 1284                         }
 1285                         if (wrch && ret == 0) {
 1286                                 CHN_LOCK(wrch);
 1287                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
 1288                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
 1289                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
 1290                                 CHN_UNLOCK(wrch);
 1291                         } else { /* use whatever came from the read channel */
 1292                                 maxfrags = r_maxfrags;
 1293                                 fragsz = r_fragsz;
 1294                         }
 1295                         PCM_RELEASE_QUICK(d);
 1296 
 1297                         fragln = 0;
 1298                         while (fragsz > 1) {
 1299                                 fragln++;
 1300                                 fragsz >>= 1;
 1301                         }
 1302                         *arg_i = (maxfrags << 16) | fragln;
 1303                 }
 1304                 break;
 1305 
 1306         case SNDCTL_DSP_GETISPACE:
 1307                 /* return the size of data available in the input queue */
 1308                 {
 1309                         audio_buf_info *a = (audio_buf_info *)arg;
 1310                         if (rdch) {
 1311                                 struct snd_dbuf *bs = rdch->bufsoft;
 1312 
 1313                                 CHN_LOCK(rdch);
 1314                                 a->bytes = sndbuf_getready(bs);
 1315                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1316                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1317                                 a->fragsize = sndbuf_getblksz(bs);
 1318                                 CHN_UNLOCK(rdch);
 1319                         } else
 1320                                 ret = EINVAL;
 1321                 }
 1322                 break;
 1323 
 1324         case SNDCTL_DSP_GETOSPACE:
 1325                 /* return space available in the output queue */
 1326                 {
 1327                         audio_buf_info *a = (audio_buf_info *)arg;
 1328                         if (wrch) {
 1329                                 struct snd_dbuf *bs = wrch->bufsoft;
 1330 
 1331                                 CHN_LOCK(wrch);
 1332                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1333                                 a->bytes = sndbuf_getfree(bs);
 1334                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1335                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1336                                 a->fragsize = sndbuf_getblksz(bs);
 1337                                 CHN_UNLOCK(wrch);
 1338                         } else
 1339                                 ret = EINVAL;
 1340                 }
 1341                 break;
 1342 
 1343         case SNDCTL_DSP_GETIPTR:
 1344                 {
 1345                         count_info *a = (count_info *)arg;
 1346                         if (rdch) {
 1347                                 struct snd_dbuf *bs = rdch->bufsoft;
 1348 
 1349                                 CHN_LOCK(rdch);
 1350                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
 1351                                 a->bytes = sndbuf_gettotal(bs);
 1352                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
 1353                                 a->ptr = sndbuf_getfreeptr(bs);
 1354                                 rdch->blocks = sndbuf_getblocks(bs);
 1355                                 CHN_UNLOCK(rdch);
 1356                         } else
 1357                                 ret = EINVAL;
 1358                 }
 1359                 break;
 1360 
 1361         case SNDCTL_DSP_GETOPTR:
 1362                 {
 1363                         count_info *a = (count_info *)arg;
 1364                         if (wrch) {
 1365                                 struct snd_dbuf *bs = wrch->bufsoft;
 1366 
 1367                                 CHN_LOCK(wrch);
 1368                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1369                                 a->bytes = sndbuf_gettotal(bs);
 1370                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
 1371                                 a->ptr = sndbuf_getreadyptr(bs);
 1372                                 wrch->blocks = sndbuf_getblocks(bs);
 1373                                 CHN_UNLOCK(wrch);
 1374                         } else
 1375                                 ret = EINVAL;
 1376                 }
 1377                 break;
 1378 
 1379         case SNDCTL_DSP_GETCAPS:
 1380                 pcm_lock(d);
 1381                 *arg_i = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER;
 1382                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1383                         *arg_i |= DSP_CAP_DUPLEX;
 1384                 pcm_unlock(d);
 1385                 break;
 1386 
 1387         case SOUND_PCM_READ_BITS:
 1388                 chn = wrch ? wrch : rdch;
 1389                 if (chn) {
 1390                         CHN_LOCK(chn);
 1391                         if (chn->format & AFMT_8BIT)
 1392                                 *arg_i = 8;
 1393                         else if (chn->format & AFMT_16BIT)
 1394                                 *arg_i = 16;
 1395                         else if (chn->format & AFMT_24BIT)
 1396                                 *arg_i = 24;
 1397                         else if (chn->format & AFMT_32BIT)
 1398                                 *arg_i = 32;
 1399                         else
 1400                                 ret = EINVAL;
 1401                         CHN_UNLOCK(chn);
 1402                 } else {
 1403                         *arg_i = 0;
 1404                         ret = EINVAL;
 1405                 }
 1406                 break;
 1407 
 1408         case SNDCTL_DSP_SETTRIGGER:
 1409                 if (rdch) {
 1410                         CHN_LOCK(rdch);
 1411                         rdch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER);
 1412                         if (*arg_i & PCM_ENABLE_INPUT)
 1413                                 chn_start(rdch, 1);
 1414                         else
 1415                                 rdch->flags |= CHN_F_NOTRIGGER;
 1416                         CHN_UNLOCK(rdch);
 1417                 }
 1418                 if (wrch) {
 1419                         CHN_LOCK(wrch);
 1420                         wrch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER);
 1421                         if (*arg_i & PCM_ENABLE_OUTPUT)
 1422                                 chn_start(wrch, 1);
 1423                         else
 1424                                 wrch->flags |= CHN_F_NOTRIGGER;
 1425                         CHN_UNLOCK(wrch);
 1426                 }
 1427                 break;
 1428 
 1429         case SNDCTL_DSP_GETTRIGGER:
 1430                 *arg_i = 0;
 1431                 if (wrch) {
 1432                         CHN_LOCK(wrch);
 1433                         if (wrch->flags & CHN_F_TRIGGERED)
 1434                                 *arg_i |= PCM_ENABLE_OUTPUT;
 1435                         CHN_UNLOCK(wrch);
 1436                 }
 1437                 if (rdch) {
 1438                         CHN_LOCK(rdch);
 1439                         if (rdch->flags & CHN_F_TRIGGERED)
 1440                                 *arg_i |= PCM_ENABLE_INPUT;
 1441                         CHN_UNLOCK(rdch);
 1442                 }
 1443                 break;
 1444 
 1445         case SNDCTL_DSP_GETODELAY:
 1446                 if (wrch) {
 1447                         struct snd_dbuf *bs = wrch->bufsoft;
 1448 
 1449                         CHN_LOCK(wrch);
 1450                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1451                         *arg_i = sndbuf_getready(bs);
 1452                         CHN_UNLOCK(wrch);
 1453                 } else
 1454                         ret = EINVAL;
 1455                 break;
 1456 
 1457         case SNDCTL_DSP_POST:
 1458                 if (wrch) {
 1459                         CHN_LOCK(wrch);
 1460                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1461                         chn_start(wrch, 1);
 1462                         CHN_UNLOCK(wrch);
 1463                 }
 1464                 break;
 1465 
 1466         case SNDCTL_DSP_SETDUPLEX:
 1467                 /*
 1468                  * switch to full-duplex mode if card is in half-duplex
 1469                  * mode and is able to work in full-duplex mode
 1470                  */
 1471                 pcm_lock(d);
 1472                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1473                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
 1474                 pcm_unlock(d);
 1475                 break;
 1476 
 1477         /*
 1478          * The following four ioctls are simple wrappers around mixer_ioctl
 1479          * with no further processing.  xcmd is short for "translated
 1480          * command".
 1481          */
 1482         case SNDCTL_DSP_GETRECVOL:
 1483                 if (xcmd == 0)
 1484                         xcmd = SOUND_MIXER_READ_RECLEV;
 1485                 /* FALLTHROUGH */
 1486         case SNDCTL_DSP_SETRECVOL:
 1487                 if (xcmd == 0)
 1488                         xcmd = SOUND_MIXER_WRITE_RECLEV;
 1489                 /* FALLTHROUGH */
 1490         case SNDCTL_DSP_GETPLAYVOL:
 1491                 if (xcmd == 0)
 1492                         xcmd = SOUND_MIXER_READ_PCM;
 1493                 /* FALLTHROUGH */
 1494         case SNDCTL_DSP_SETPLAYVOL:
 1495                 if (xcmd == 0)
 1496                         xcmd = SOUND_MIXER_WRITE_PCM;
 1497 
 1498                 if (d->mixer_dev != NULL) {
 1499                         PCM_ACQUIRE_QUICK(d);
 1500                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
 1501                             MIXER_CMD_DIRECT);
 1502                         PCM_RELEASE_QUICK(d);
 1503                 } else
 1504                         ret = ENOTSUP;
 1505                 break;
 1506 
 1507         case SNDCTL_DSP_GET_RECSRC_NAMES:
 1508         case SNDCTL_DSP_GET_RECSRC:
 1509         case SNDCTL_DSP_SET_RECSRC:
 1510                 if (d->mixer_dev != NULL) {
 1511                         PCM_ACQUIRE_QUICK(d);
 1512                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1513                             MIXER_CMD_DIRECT);
 1514                         PCM_RELEASE_QUICK(d);
 1515                 } else
 1516                         ret = ENOTSUP;
 1517                 break;
 1518 
 1519         /*
 1520          * The following 3 ioctls aren't very useful at the moment.  For
 1521          * now, only a single channel is associated with a cdev (/dev/dspN
 1522          * instance), so there's only a single output routing to use (i.e.,
 1523          * the wrch bound to this cdev).
 1524          */
 1525         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
 1526                 {
 1527                         oss_mixer_enuminfo *ei;
 1528                         ei = (oss_mixer_enuminfo *)arg;
 1529                         ei->dev = 0;
 1530                         ei->ctrl = 0;
 1531                         ei->version = 0; /* static for now */
 1532                         ei->strindex[0] = 0;
 1533 
 1534                         if (wrch != NULL) {
 1535                                 ei->nvalues = 1;
 1536                                 strlcpy(ei->strings, wrch->name,
 1537                                         sizeof(ei->strings));
 1538                         } else {
 1539                                 ei->nvalues = 0;
 1540                                 ei->strings[0] = '\0';
 1541                         }
 1542                 }
 1543                 break;
 1544         case SNDCTL_DSP_GET_PLAYTGT:
 1545         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
 1546                 /*
 1547                  * Re: SET_PLAYTGT
 1548                  *   OSSv4: "The value that was accepted by the device will
 1549                  *   be returned back in the variable pointed by the
 1550                  *   argument."
 1551                  */
 1552                 if (wrch != NULL)
 1553                         *arg_i = 0;
 1554                 else
 1555                         ret = EINVAL;
 1556                 break;
 1557 
 1558         case SNDCTL_DSP_SILENCE:
 1559         /*
 1560          * Flush the software (pre-feed) buffer, but try to minimize playback
 1561          * interruption.  (I.e., record unplayed samples with intent to
 1562          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
 1563          * functionality.
 1564          */
 1565                 if (wrch == NULL)
 1566                         ret = EINVAL;
 1567                 else {
 1568                         struct snd_dbuf *bs;
 1569                         CHN_LOCK(wrch);
 1570                         while (wrch->inprog != 0)
 1571                                 cv_wait(&wrch->cv, wrch->lock);
 1572                         bs = wrch->bufsoft;
 1573                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
 1574                                 bs->sl = sndbuf_getready(bs);
 1575                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
 1576                                 sndbuf_fillsilence(bs);
 1577                                 chn_start(wrch, 0);
 1578                         }
 1579                         CHN_UNLOCK(wrch);
 1580                 }
 1581                 break;
 1582 
 1583         case SNDCTL_DSP_SKIP:
 1584         /*
 1585          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
 1586          * playback buffer by moving the current write position immediately
 1587          * before the point where the device is currently reading the samples."
 1588          */
 1589                 if (wrch == NULL)
 1590                         ret = EINVAL;
 1591                 else {
 1592                         struct snd_dbuf *bs;
 1593                         CHN_LOCK(wrch);
 1594                         while (wrch->inprog != 0)
 1595                                 cv_wait(&wrch->cv, wrch->lock);
 1596                         bs = wrch->bufsoft;
 1597                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
 1598                                 sndbuf_softreset(bs);
 1599                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
 1600                                 bs->sl = 0;
 1601                                 chn_start(wrch, 0);
 1602                         }
 1603                         CHN_UNLOCK(wrch);
 1604                 }
 1605                 break;
 1606 
 1607         case SNDCTL_DSP_CURRENT_OPTR:
 1608         case SNDCTL_DSP_CURRENT_IPTR:
 1609         /**
 1610          * @note Changing formats resets the buffer counters, which differs
 1611          *       from the 4Front drivers.  However, I don't expect this to be
 1612          *       much of a problem.
 1613          *
 1614          * @note In a test where @c CURRENT_OPTR is called immediately after write
 1615          *       returns, this driver is about 32K samples behind whereas
 1616          *       4Front's is about 8K samples behind.  Should determine source
 1617          *       of discrepancy, even if only out of curiosity.
 1618          *
 1619          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
 1620          */
 1621                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
 1622                 if (chn == NULL) 
 1623                         ret = EINVAL;
 1624                 else {
 1625                         struct snd_dbuf *bs;
 1626                         /* int tmp; */
 1627 
 1628                         oss_count_t *oc = (oss_count_t *)arg;
 1629 
 1630                         CHN_LOCK(chn);
 1631                         bs = chn->bufsoft;
 1632 #if 0
 1633                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
 1634                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getbps(b);
 1635                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getbps(b);
 1636 #else
 1637                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getbps(bs);
 1638                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getbps(bs);
 1639 #endif
 1640                         CHN_UNLOCK(chn);
 1641                 }
 1642                 break;
 1643 
 1644         case SNDCTL_DSP_HALT_OUTPUT:
 1645         case SNDCTL_DSP_HALT_INPUT:
 1646                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
 1647                 if (chn == NULL)
 1648                         ret = EINVAL;
 1649                 else {
 1650                         CHN_LOCK(chn);
 1651                         chn_abort(chn);
 1652                         CHN_UNLOCK(chn);
 1653                 }
 1654                 break;
 1655 
 1656         case SNDCTL_DSP_LOW_WATER:
 1657         /*
 1658          * Set the number of bytes required to attract attention by
 1659          * select/poll.
 1660          */
 1661                 if (wrch != NULL) {
 1662                         CHN_LOCK(wrch);
 1663                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
 1664                         CHN_UNLOCK(wrch);
 1665                 }
 1666                 if (rdch != NULL) {
 1667                         CHN_LOCK(rdch);
 1668                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
 1669                         CHN_UNLOCK(rdch);
 1670                 }
 1671                 break;
 1672 
 1673         case SNDCTL_DSP_GETERROR:
 1674         /*
 1675          * OSSv4 docs:  "All errors and counters will automatically be
 1676          * cleared to zeroes after the call so each call will return only
 1677          * the errors that occurred after the previous invocation. ... The
 1678          * play_underruns and rec_overrun fields are the only usefull fields
 1679          * returned by OSS 4.0."
 1680          */
 1681                 {
 1682                         audio_errinfo *ei = (audio_errinfo *)arg;
 1683 
 1684                         bzero((void *)ei, sizeof(*ei));
 1685 
 1686                         if (wrch != NULL) {
 1687                                 CHN_LOCK(wrch);
 1688                                 ei->play_underruns = wrch->xruns;
 1689                                 wrch->xruns = 0;
 1690                                 CHN_UNLOCK(wrch);
 1691                         }
 1692                         if (rdch != NULL) {
 1693                                 CHN_LOCK(rdch);
 1694                                 ei->rec_overruns = rdch->xruns;
 1695                                 rdch->xruns = 0;
 1696                                 CHN_UNLOCK(rdch);
 1697                         }
 1698                 }
 1699                 break;
 1700 
 1701         case SNDCTL_DSP_SYNCGROUP:
 1702                 PCM_ACQUIRE_QUICK(d);
 1703                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
 1704                 PCM_RELEASE_QUICK(d);
 1705                 break;
 1706 
 1707         case SNDCTL_DSP_SYNCSTART:
 1708                 PCM_ACQUIRE_QUICK(d);
 1709                 ret = dsp_oss_syncstart(*arg_i);
 1710                 PCM_RELEASE_QUICK(d);
 1711                 break;
 1712 
 1713         case SNDCTL_DSP_POLICY:
 1714                 PCM_ACQUIRE_QUICK(d);
 1715                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
 1716                 PCM_RELEASE_QUICK(d);
 1717                 break;
 1718 
 1719 #ifdef  OSSV4_EXPERIMENT
 1720         /*
 1721          * XXX The following ioctls are not yet supported and just return
 1722          * EINVAL.
 1723          */
 1724         case SNDCTL_DSP_GETOPEAKS:
 1725         case SNDCTL_DSP_GETIPEAKS:
 1726                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
 1727                 if (chn == NULL)
 1728                         ret = EINVAL;
 1729                 else {
 1730                         oss_peaks_t *op = (oss_peaks_t *)arg;
 1731                         int lpeak, rpeak;
 1732 
 1733                         CHN_LOCK(chn);
 1734                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
 1735                         if (ret == -1)
 1736                                 ret = EINVAL;
 1737                         else {
 1738                                 (*op)[0] = lpeak;
 1739                                 (*op)[1] = rpeak;
 1740                         }
 1741                         CHN_UNLOCK(chn);
 1742                 }
 1743                 break;
 1744 
 1745         /*
 1746          * XXX Once implemented, revisit this for proper cv protection
 1747          *     (if necessary).
 1748          */
 1749         case SNDCTL_DSP_COOKEDMODE:
 1750                 ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
 1751                 break;
 1752         case SNDCTL_DSP_GET_CHNORDER:
 1753                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
 1754                 break;
 1755         case SNDCTL_DSP_SET_CHNORDER:
 1756                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
 1757                 break;
 1758         case SNDCTL_GETLABEL:
 1759                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
 1760                 break;
 1761         case SNDCTL_SETLABEL:
 1762                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
 1763                 break;
 1764         case SNDCTL_GETSONG:
 1765                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
 1766                 break;
 1767         case SNDCTL_SETSONG:
 1768                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
 1769                 break;
 1770         case SNDCTL_SETNAME:
 1771                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
 1772                 break;
 1773 #if 0
 1774         /**
 1775          * @note The SNDCTL_CARDINFO ioctl was omitted per 4Front developer
 1776          * documentation.  "The usability of this call is very limited. It's
 1777          * provided only for completeness of the API. OSS API doesn't have
 1778          * any concept of card. Any information returned by this ioctl calld
 1779          * is reserved exclusively for the utility programs included in the
 1780          * OSS package. Applications should not try to use for this
 1781          * information in any ways."
 1782          */
 1783         case SNDCTL_CARDINFO:
 1784                 ret = EINVAL;
 1785                 break;
 1786         /**
 1787          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
 1788          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
 1789          * 4Front Technologies.
 1790          */
 1791         case SNDCTL_DSP_READCTL:
 1792         case SNDCTL_DSP_WRITECTL:
 1793                 ret = EINVAL;
 1794                 break;
 1795 #endif  /* !0 (explicitly omitted ioctls) */
 1796 
 1797 #endif  /* !OSSV4_EXPERIMENT */
 1798         case SNDCTL_DSP_MAPINBUF:
 1799         case SNDCTL_DSP_MAPOUTBUF:
 1800         case SNDCTL_DSP_SETSYNCRO:
 1801                 /* undocumented */
 1802 
 1803         case SNDCTL_DSP_SUBDIVIDE:
 1804         case SOUND_PCM_WRITE_FILTER:
 1805         case SOUND_PCM_READ_FILTER:
 1806                 /* dunno what these do, don't sound important */
 1807 
 1808         default:
 1809                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
 1810                 ret = EINVAL;
 1811                 break;
 1812         }
 1813 
 1814         relchns(i_dev, rdch, wrch, 0);
 1815 
 1816         PCM_GIANT_LEAVE(d);
 1817 
 1818         return (ret);
 1819 }
 1820 
 1821 static int
 1822 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
 1823 {
 1824         struct snddev_info *d;
 1825         struct pcm_channel *wrch, *rdch;
 1826         int ret, e;
 1827 
 1828         d = dsp_get_info(i_dev);
 1829         if (!DSP_REGISTERED(d, i_dev))
 1830                 return (EBADF);
 1831 
 1832         PCM_GIANT_ENTER(d);
 1833 
 1834         wrch = NULL;
 1835         rdch = NULL;
 1836         ret = 0;
 1837 
 1838         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 1839 
 1840         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
 1841                 e = (events & (POLLOUT | POLLWRNORM));
 1842                 if (e)
 1843                         ret |= chn_poll(wrch, e, td);
 1844         }
 1845 
 1846         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
 1847                 e = (events & (POLLIN | POLLRDNORM));
 1848                 if (e)
 1849                         ret |= chn_poll(rdch, e, td);
 1850         }
 1851 
 1852         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 1853 
 1854         PCM_GIANT_LEAVE(d);
 1855 
 1856         return (ret);
 1857 }
 1858 
 1859 static int
 1860 dsp_mmap(struct cdev *i_dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
 1861 {
 1862 
 1863         *paddr = vtophys(offset);
 1864         return (0);
 1865 }
 1866 
 1867 static int
 1868 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
 1869     vm_size_t size, struct vm_object **object, int nprot)
 1870 {
 1871         struct snddev_info *d;
 1872         struct pcm_channel *wrch, *rdch, *c;
 1873 
 1874         /*
 1875          * Reject PROT_EXEC by default. It just doesn't makes sense.
 1876          * Unfortunately, we have to give up this one due to linux_mmap
 1877          * changes.
 1878          *
 1879          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
 1880          *
 1881          */
 1882         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec == 0)
 1883                 return (EINVAL);
 1884 
 1885         /*
 1886          * PROT_READ (alone) selects the input buffer.
 1887          * PROT_WRITE (alone) selects the output buffer.
 1888          * PROT_WRITE|PROT_READ together select the output buffer.
 1889          */
 1890         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
 1891                 return (EINVAL);
 1892 
 1893         d = dsp_get_info(i_dev);
 1894         if (!DSP_REGISTERED(d, i_dev))
 1895                 return (EINVAL);
 1896 
 1897         PCM_GIANT_ENTER(d);
 1898 
 1899         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 1900 
 1901         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
 1902         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
 1903             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
 1904             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
 1905             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
 1906                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 1907                 PCM_GIANT_EXIT(d);
 1908                 return (EINVAL);
 1909         }
 1910 
 1911         if (wrch != NULL)
 1912                 wrch->flags |= CHN_F_MAPPED;
 1913         if (rdch != NULL)
 1914                 rdch->flags |= CHN_F_MAPPED;
 1915 
 1916         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
 1917         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 1918         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
 1919             size, nprot, *offset);
 1920 
 1921         PCM_GIANT_LEAVE(d);
 1922 
 1923         if (*object == NULL)
 1924                  return (EINVAL);
 1925         return (0);
 1926 }
 1927 
 1928 #ifdef USING_DEVFS
 1929 
 1930 /* So much for dev_stdclone() */
 1931 static int
 1932 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
 1933 {
 1934         size_t len;
 1935 
 1936         len = strlen(namep);
 1937 
 1938         if (bcmp(name, namep, len) != 0)
 1939                 return (ENODEV);
 1940 
 1941         name += len;
 1942 
 1943         if (isdigit(*name) == 0)
 1944                 return (ENODEV);
 1945 
 1946         len = strlen(sep);
 1947 
 1948         if (*name == '' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
 1949                 return (ENODEV);
 1950 
 1951         for (*u = 0; isdigit(*name) != 0; name++) {
 1952                 *u *= 10;
 1953                 *u += *name - '';
 1954                 if (*u > dsp_umax)
 1955                         return (ENODEV);
 1956         }
 1957 
 1958         if (*name == '\0')
 1959                 return ((use_sep == 0) ? 0 : ENODEV);
 1960 
 1961         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
 1962                 return (ENODEV);
 1963 
 1964         name += len;
 1965 
 1966         if (*name == '' && name[1] != '\0')
 1967                 return (ENODEV);
 1968 
 1969         for (*c = 0; isdigit(*name) != 0; name++) {
 1970                 *c *= 10;
 1971                 *c += *name - '';
 1972                 if (*c > dsp_cmax)
 1973                         return (ENODEV);
 1974         }
 1975 
 1976         if (*name != '\0')
 1977                 return (ENODEV);
 1978 
 1979         return (0);
 1980 }
 1981 
 1982 static void
 1983 dsp_clone(void *arg,
 1984 #if __FreeBSD_version >= 600034
 1985     struct ucred *cred,
 1986 #endif
 1987     char *name, int namelen, struct cdev **dev)
 1988 {
 1989         struct snddev_info *d;
 1990         struct snd_clone_entry *ce;
 1991         struct pcm_channel *c;
 1992         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
 1993         char *devname, *devsep;
 1994 
 1995         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
 1996 
 1997         if (*dev != NULL)
 1998                 return;
 1999 
 2000         unit = -1;
 2001         cunit = -1;
 2002         devtype = -1;
 2003         devhw = 0;
 2004         devcmax = -1;
 2005         tumax = -1;
 2006         devname = NULL;
 2007         devsep = NULL;
 2008 
 2009         for (i = 0; unit == -1 &&
 2010             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2011                 devtype = dsp_cdevs[i].type;
 2012                 devname = dsp_cdevs[i].name;
 2013                 devsep = dsp_cdevs[i].sep;
 2014                 devhw = dsp_cdevs[i].hw;
 2015                 devcmax = dsp_cdevs[i].max - 1;
 2016                 if (strcmp(name, devname) == 0)
 2017                         unit = snd_unit;
 2018                 else if (dsp_stdclone(name, devname, devsep,
 2019                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
 2020                         unit = -1;
 2021                         cunit = -1;
 2022                 }
 2023         }
 2024 
 2025         d = devclass_get_softc(pcm_devclass, unit);
 2026         if (!PCM_REGISTERED(d) || d->clones == NULL)
 2027                 return;
 2028 
 2029         /* XXX Need Giant magic entry ??? */
 2030 
 2031         pcm_lock(d);
 2032         if (snd_clone_disabled(d->clones)) {
 2033                 pcm_unlock(d);
 2034                 return;
 2035         }
 2036 
 2037         PCM_WAIT(d);
 2038         PCM_ACQUIRE(d);
 2039         pcm_unlock(d);
 2040 
 2041         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
 2042 
 2043         if (devhw != 0) {
 2044                 KASSERT(devcmax <= dsp_cmax,
 2045                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
 2046                 if (cunit > devcmax) {
 2047                         PCM_RELEASE_QUICK(d);
 2048                         return;
 2049                 }
 2050                 udcmask |= snd_c2unit(cunit);
 2051                 CHN_FOREACH(c, d, channels.pcm) {
 2052                         CHN_LOCK(c);
 2053                         if (c->unit != udcmask) {
 2054                                 CHN_UNLOCK(c);
 2055                                 continue;
 2056                         }
 2057                         CHN_UNLOCK(c);
 2058                         udcmask &= ~snd_c2unit(cunit);
 2059                         /*
 2060                          * Temporarily increase clone maxunit to overcome
 2061                          * vchan flexibility.
 2062                          *
 2063                          * # sysctl dev.pcm.0.play.vchans=256
 2064                          * dev.pcm.0.play.vchans: 1 -> 256
 2065                          * # cat /dev/zero > /dev/dsp0.vp255 &
 2066                          * [1] 17296
 2067                          * # sysctl dev.pcm.0.play.vchans=0
 2068                          * dev.pcm.0.play.vchans: 256 -> 1
 2069                          * # fg
 2070                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
 2071                          * ^C
 2072                          * # cat /dev/zero > /dev/dsp0.vp255
 2073                          * zsh: operation not supported: /dev/dsp0.vp255
 2074                          */
 2075                         tumax = snd_clone_getmaxunit(d->clones);
 2076                         if (cunit > tumax)
 2077                                 snd_clone_setmaxunit(d->clones, cunit);
 2078                         else
 2079                                 tumax = -1;
 2080                         goto dsp_clone_alloc;
 2081                 }
 2082                 /*
 2083                  * Ok, so we're requesting unallocated vchan, but still
 2084                  * within maximum vchan limit.
 2085                  */
 2086                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
 2087                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
 2088                     cunit < snd_maxautovchans) {
 2089                         udcmask &= ~snd_c2unit(cunit);
 2090                         tumax = snd_clone_getmaxunit(d->clones);
 2091                         if (cunit > tumax)
 2092                                 snd_clone_setmaxunit(d->clones, cunit);
 2093                         else
 2094                                 tumax = -1;
 2095                         goto dsp_clone_alloc;
 2096                 }
 2097                 PCM_RELEASE_QUICK(d);
 2098                 return;
 2099         }
 2100 
 2101 dsp_clone_alloc:
 2102         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
 2103         if (tumax != -1)
 2104                 snd_clone_setmaxunit(d->clones, tumax);
 2105         if (ce != NULL) {
 2106                 udcmask |= snd_c2unit(cunit);
 2107                 *dev = make_dev(&dsp_cdevsw, unit2minor(udcmask),
 2108                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
 2109                     devname, unit, devsep, cunit);
 2110                 snd_clone_register(ce, *dev);
 2111         }
 2112 
 2113         PCM_RELEASE_QUICK(d);
 2114 
 2115         if (*dev != NULL)
 2116                 dev_ref(*dev);
 2117 }
 2118 
 2119 static void
 2120 dsp_sysinit(void *p)
 2121 {
 2122         if (dsp_ehtag != NULL)
 2123                 return;
 2124         /* initialize unit numbering */
 2125         snd_unit_init();
 2126         dsp_umax = PCMMAXUNIT;
 2127         dsp_cmax = PCMMAXCHAN;
 2128         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
 2129 }
 2130 
 2131 static void
 2132 dsp_sysuninit(void *p)
 2133 {
 2134         if (dsp_ehtag == NULL)
 2135                 return;
 2136         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
 2137         dsp_ehtag = NULL;
 2138 }
 2139 
 2140 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
 2141 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
 2142 #endif
 2143 
 2144 char *
 2145 dsp_unit2name(char *buf, size_t len, int unit)
 2146 {
 2147         int i, dtype;
 2148 
 2149         KASSERT(buf != NULL && len != 0,
 2150             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
 2151 
 2152         dtype = snd_unit2d(unit);
 2153 
 2154         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2155                 if (dtype != dsp_cdevs[i].type)
 2156                         continue;
 2157                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
 2158                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
 2159                 return (buf);
 2160         }
 2161 
 2162         return (NULL);
 2163 }
 2164 
 2165 /**
 2166  * @brief Handler for SNDCTL_AUDIOINFO.
 2167  *
 2168  * Gathers information about the audio device specified in ai->dev.  If
 2169  * ai->dev == -1, then this function gathers information about the current
 2170  * device.  If the call comes in on a non-audio device and ai->dev == -1,
 2171  * return EINVAL.
 2172  *
 2173  * This routine is supposed to go practically straight to the hardware,
 2174  * getting capabilities directly from the sound card driver, side-stepping
 2175  * the intermediate channel interface.
 2176  *
 2177  * Note, however, that the usefulness of this command is significantly
 2178  * decreased when requesting info about any device other than the one serving
 2179  * the request. While each snddev_channel refers to a specific device node,
 2180  * the converse is *not* true.  Currently, when a sound device node is opened,
 2181  * the sound subsystem scans for an available audio channel (or channels, if
 2182  * opened in read+write) and then assigns them to the si_drv[12] private
 2183  * data fields.  As a result, any information returned linking a channel to
 2184  * a specific character device isn't necessarily accurate.
 2185  *
 2186  * @note
 2187  * Calling threads must not hold any snddev_info or pcm_channel locks.
 2188  * 
 2189  * @param dev           device on which the ioctl was issued
 2190  * @param ai            ioctl request data container
 2191  *
 2192  * @retval 0            success
 2193  * @retval EINVAL       ai->dev specifies an invalid device
 2194  *
 2195  * @todo Verify correctness of Doxygen tags.  ;)
 2196  */
 2197 int
 2198 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
 2199 {
 2200         struct pcmchan_caps *caps;
 2201         struct pcm_channel *ch;
 2202         struct snddev_info *d;
 2203         uint32_t fmts;
 2204         int i, nchan, *rates, minch, maxch;
 2205         char *devname, buf[CHN_NAMELEN];
 2206 
 2207         /*
 2208          * If probing the device that received the ioctl, make sure it's a
 2209          * DSP device.  (Users may use this ioctl with /dev/mixer and
 2210          * /dev/midi.)
 2211          */
 2212         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
 2213                 return (EINVAL);
 2214 
 2215         ch = NULL;
 2216         devname = NULL;
 2217         nchan = 0;
 2218         bzero(buf, sizeof(buf));
 2219 
 2220         /*
 2221          * Search for the requested audio device (channel).  Start by
 2222          * iterating over pcm devices.
 2223          */ 
 2224         for (i = 0; pcm_devclass != NULL &&
 2225             i < devclass_get_maxunit(pcm_devclass); i++) {
 2226                 d = devclass_get_softc(pcm_devclass, i);
 2227                 if (!PCM_REGISTERED(d))
 2228                         continue;
 2229 
 2230                 /* XXX Need Giant magic entry ??? */
 2231 
 2232                 /* See the note in function docblock */
 2233                 mtx_assert(d->lock, MA_NOTOWNED);
 2234                 pcm_lock(d);
 2235 
 2236                 CHN_FOREACH(ch, d, channels.pcm) {
 2237                         mtx_assert(ch->lock, MA_NOTOWNED);
 2238                         CHN_LOCK(ch);
 2239                         if (ai->dev == -1) {
 2240                                 if (DSP_REGISTERED(d, i_dev) &&
 2241                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
 2242                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
 2243                                         devname = dsp_unit2name(buf,
 2244                                             sizeof(buf), ch->unit);
 2245                                 }
 2246                         } else if (ai->dev == nchan) {
 2247                                 devname = dsp_unit2name(buf, sizeof(buf),
 2248                                     ch->unit);
 2249                         }
 2250                         if (devname != NULL)
 2251                                 break;
 2252                         CHN_UNLOCK(ch);
 2253                         ++nchan;
 2254                 }
 2255 
 2256                 if (devname != NULL) {
 2257                         /*
 2258                          * At this point, the following synchronization stuff
 2259                          * has happened:
 2260                          * - a specific PCM device is locked.
 2261                          * - a specific audio channel has been locked, so be
 2262                          *   sure to unlock when exiting;
 2263                          */
 2264 
 2265                         caps = chn_getcaps(ch);
 2266 
 2267                         /*
 2268                          * With all handles collected, zero out the user's
 2269                          * container and begin filling in its fields.
 2270                          */
 2271                         bzero((void *)ai, sizeof(oss_audioinfo));
 2272 
 2273                         ai->dev = nchan;
 2274                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
 2275 
 2276                         if ((ch->flags & CHN_F_BUSY) == 0)
 2277                                 ai->busy = 0;
 2278                         else
 2279                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
 2280 
 2281                         /**
 2282                          * @note
 2283                          * @c cmd - OSSv4 docs: "Only supported under Linux at
 2284                          *    this moment." Cop-out, I know, but I'll save
 2285                          *    running around in the process table for later.
 2286                          *    Is there a risk of leaking information?
 2287                          */
 2288                         ai->pid = ch->pid;
 2289 
 2290                         /*
 2291                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
 2292                          * Note, however, that a single channel operates in
 2293                          * only one direction, so DSP_CAP_DUPLEX is out.
 2294                          */
 2295                         /**
 2296                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
 2297                          *       these in pcmchan::caps?
 2298                          */
 2299                         ai->caps = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER;
 2300 
 2301                         /*
 2302                          * Collect formats supported @b natively by the
 2303                          * device.  Also determine min/max channels.  (I.e.,
 2304                          * mono, stereo, or both?)
 2305                          *
 2306                          * If any channel is stereo, maxch = 2;
 2307                          * if all channels are stereo, minch = 2, too;
 2308                          * if any channel is mono, minch = 1;
 2309                          * and if all channels are mono, maxch = 1.
 2310                          */
 2311                         minch = 0;
 2312                         maxch = 0;
 2313                         fmts = 0;
 2314                         for (i = 0; caps->fmtlist[i]; i++) {
 2315                                 fmts |= caps->fmtlist[i];
 2316                                 if (caps->fmtlist[i] & AFMT_STEREO) {
 2317                                         minch = (minch == 0) ? 2 : minch;
 2318                                         maxch = 2;
 2319                                 } else {
 2320                                         minch = 1;
 2321                                         maxch = (maxch == 0) ? 1 : maxch;
 2322                                 }
 2323                         }
 2324 
 2325                         if (ch->direction == PCMDIR_PLAY)
 2326                                 ai->oformats = fmts;
 2327                         else
 2328                                 ai->iformats = fmts;
 2329 
 2330                         /**
 2331                          * @note
 2332                          * @c magic - OSSv4 docs: "Reserved for internal use
 2333                          *    by OSS."
 2334                          *
 2335                          * @par
 2336                          * @c card_number - OSSv4 docs: "Number of the sound
 2337                          *    card where this device belongs or -1 if this
 2338                          *    information is not available.  Applications
 2339                          *    should normally not use this field for any
 2340                          *    purpose."
 2341                          */
 2342                         ai->card_number = -1;
 2343                         /**
 2344                          * @todo @c song_name - depends first on
 2345                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
 2346                          *          on SNDCTL_[GS]ETLABEL
 2347                          * @todo @c port_number - routing information?
 2348                          */
 2349                         ai->port_number = -1;
 2350                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
 2351                         /**
 2352                          * @note
 2353                          * @c real_device - OSSv4 docs:  "Obsolete."
 2354                          */
 2355                         ai->real_device = -1;
 2356                         strlcpy(ai->devnode, devname, sizeof(ai->devnode));
 2357                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
 2358                         /**
 2359                          * @note
 2360                          * @c flags - OSSv4 docs: "Reserved for future use."
 2361                          *
 2362                          * @note
 2363                          * @c binding - OSSv4 docs: "Reserved for future use."
 2364                          *
 2365                          * @todo @c handle - haven't decided how to generate
 2366                          *       this yet; bus, vendor, device IDs?
 2367                          */
 2368                         ai->min_rate = caps->minspeed;
 2369                         ai->max_rate = caps->maxspeed;
 2370 
 2371                         ai->min_channels = minch;
 2372                         ai->max_channels = maxch;
 2373 
 2374                         ai->nrates = chn_getrates(ch, &rates);
 2375                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
 2376                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
 2377 
 2378                         for (i = 0; i < ai->nrates; i++)
 2379                                 ai->rates[i] = rates[i];
 2380 
 2381                         CHN_UNLOCK(ch);
 2382                 }
 2383 
 2384                 pcm_unlock(d);
 2385 
 2386                 if (devname != NULL)
 2387                         return (0);
 2388         }
 2389 
 2390         /* Exhausted the search -- nothing is locked, so return. */
 2391         return (EINVAL);
 2392 }
 2393 
 2394 /**
 2395  * @brief Assigns a PCM channel to a sync group.
 2396  *
 2397  * Sync groups are used to enable audio operations on multiple devices
 2398  * simultaneously.  They may be used with any number of devices and may
 2399  * span across applications.  Devices are added to groups with
 2400  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
 2401  * SNDCTL_DSP_SYNCSTART ioctl.
 2402  *
 2403  * If the @c id field of the @c group parameter is set to zero, then a new
 2404  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
 2405  * the group specified.
 2406  *
 2407  * @todo As far as memory allocation, should we assume that things are
 2408  *       okay and allocate with M_WAITOK before acquiring channel locks,
 2409  *       freeing later if not?
 2410  *
 2411  * @param wrch  output channel associated w/ device (if any)
 2412  * @param rdch  input channel associated w/ device (if any)
 2413  * @param group Sync group parameters
 2414  *
 2415  * @retval 0            success
 2416  * @retval non-zero     error to be propagated upstream
 2417  */
 2418 static int
 2419 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
 2420 {
 2421         struct pcmchan_syncmember *smrd, *smwr;
 2422         struct pcmchan_syncgroup *sg;
 2423         int ret, sg_ids[3];
 2424 
 2425         smrd = NULL;
 2426         smwr = NULL;
 2427         sg = NULL;
 2428         ret = 0;
 2429 
 2430         /*
 2431          * Free_unr() may sleep, so store released syncgroup IDs until after
 2432          * all locks are released.
 2433          */
 2434         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
 2435 
 2436         PCM_SG_LOCK();
 2437 
 2438         /*
 2439          * - Insert channel(s) into group's member list.
 2440          * - Set CHN_F_NOTRIGGER on channel(s).
 2441          * - Stop channel(s).  
 2442          */
 2443 
 2444         /*
 2445          * If device's channels are already mapped to a group, unmap them.
 2446          */
 2447         if (wrch) {
 2448                 CHN_LOCK(wrch);
 2449                 sg_ids[0] = chn_syncdestroy(wrch);
 2450         }
 2451 
 2452         if (rdch) {
 2453                 CHN_LOCK(rdch);
 2454                 sg_ids[1] = chn_syncdestroy(rdch);
 2455         }
 2456 
 2457         /*
 2458          * Verify that mode matches character device properites.
 2459          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
 2460          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
 2461          */
 2462         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
 2463             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
 2464                 ret = EINVAL;
 2465                 goto out;
 2466         }
 2467 
 2468         /*
 2469          * An id of zero indicates the user wants to create a new
 2470          * syncgroup.
 2471          */
 2472         if (group->id == 0) {
 2473                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 2474                 if (sg != NULL) {
 2475                         SLIST_INIT(&sg->members);
 2476                         sg->id = alloc_unr(pcmsg_unrhdr);
 2477 
 2478                         group->id = sg->id;
 2479                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
 2480                 } else
 2481                         ret = ENOMEM;
 2482         } else {
 2483                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2484                         if (sg->id == group->id)
 2485                                 break;
 2486                 }
 2487                 if (sg == NULL)
 2488                         ret = EINVAL;
 2489         }
 2490 
 2491         /* Couldn't create or find a syncgroup.  Fail. */
 2492         if (sg == NULL)
 2493                 goto out;
 2494 
 2495         /*
 2496          * Allocate a syncmember, assign it and a channel together, and
 2497          * insert into syncgroup.
 2498          */
 2499         if (group->mode & PCM_ENABLE_INPUT) {
 2500                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 2501                 if (smrd == NULL) {
 2502                         ret = ENOMEM;
 2503                         goto out;
 2504                 }
 2505 
 2506                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
 2507                 smrd->parent = sg;
 2508                 smrd->ch = rdch;
 2509 
 2510                 chn_abort(rdch);
 2511                 rdch->flags |= CHN_F_NOTRIGGER;
 2512                 rdch->sm = smrd;
 2513         }
 2514 
 2515         if (group->mode & PCM_ENABLE_OUTPUT) {
 2516                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 2517                 if (smwr == NULL) {
 2518                         ret = ENOMEM;
 2519                         goto out;
 2520                 }
 2521 
 2522                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
 2523                 smwr->parent = sg;
 2524                 smwr->ch = wrch;
 2525 
 2526                 chn_abort(wrch);
 2527                 wrch->flags |= CHN_F_NOTRIGGER;
 2528                 wrch->sm = smwr;
 2529         }
 2530 
 2531 
 2532 out:
 2533         if (ret != 0) {
 2534                 if (smrd != NULL)
 2535                         free(smrd, M_DEVBUF);
 2536                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
 2537                         sg_ids[2] = sg->id;
 2538                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2539                         free(sg, M_DEVBUF);
 2540                 }
 2541 
 2542                 if (wrch)
 2543                         wrch->sm = NULL;
 2544                 if (rdch)
 2545                         rdch->sm = NULL;
 2546         }
 2547 
 2548         if (wrch)
 2549                 CHN_UNLOCK(wrch);
 2550         if (rdch)
 2551                 CHN_UNLOCK(rdch);
 2552 
 2553         PCM_SG_UNLOCK();
 2554 
 2555         if (sg_ids[0])
 2556                 free_unr(pcmsg_unrhdr, sg_ids[0]);
 2557         if (sg_ids[1])
 2558                 free_unr(pcmsg_unrhdr, sg_ids[1]);
 2559         if (sg_ids[2])
 2560                 free_unr(pcmsg_unrhdr, sg_ids[2]);
 2561 
 2562         return (ret);
 2563 }
 2564 
 2565 /**
 2566  * @brief Launch a sync group into action
 2567  *
 2568  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
 2569  * iterates over all members, triggering them along the way.
 2570  *
 2571  * @note Caller must not hold any channel locks.
 2572  *
 2573  * @param sg_id sync group identifier
 2574  *
 2575  * @retval 0    success
 2576  * @retval non-zero     error worthy of propagating upstream to user
 2577  */
 2578 static int
 2579 dsp_oss_syncstart(int sg_id)
 2580 {
 2581         struct pcmchan_syncmember *sm, *sm_tmp;
 2582         struct pcmchan_syncgroup *sg;
 2583         struct pcm_channel *c;
 2584         int ret, needlocks;
 2585 
 2586         /* Get the synclists lock */
 2587         PCM_SG_LOCK();
 2588 
 2589         do {
 2590                 ret = 0;
 2591                 needlocks = 0;
 2592 
 2593                 /* Search for syncgroup by ID */
 2594                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2595                         if (sg->id == sg_id)
 2596                                 break;
 2597                 }
 2598 
 2599                 /* Return EINVAL if not found */
 2600                 if (sg == NULL) {
 2601                         ret = EINVAL;
 2602                         break;
 2603                 }
 2604 
 2605                 /* Any removals resulting in an empty group should've handled this */
 2606                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
 2607 
 2608                 /*
 2609                  * Attempt to lock all member channels - if any are already
 2610                  * locked, unlock those acquired, sleep for a bit, and try
 2611                  * again.
 2612                  */
 2613                 SLIST_FOREACH(sm, &sg->members, link) {
 2614                         if (CHN_TRYLOCK(sm->ch) == 0) {
 2615                                 int timo = hz * 5/1000; 
 2616                                 if (timo < 1)
 2617                                         timo = 1;
 2618 
 2619                                 /* Release all locked channels so far, retry */
 2620                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
 2621                                         /* sm is the member already locked */
 2622                                         if (sm == sm_tmp)
 2623                                                 break;
 2624                                         CHN_UNLOCK(sm_tmp->ch);
 2625                                 }
 2626 
 2627                                 /** @todo Is PRIBIO correct/ */
 2628                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
 2629                                     PRIBIO | PCATCH, "pcmsg", timo);
 2630                                 if (ret == EINTR || ret == ERESTART)
 2631                                         break;
 2632 
 2633                                 needlocks = 1;
 2634                                 ret = 0; /* Assumes ret == EAGAIN... */
 2635                         }
 2636                 }
 2637         } while (needlocks && ret == 0);
 2638 
 2639         /* Proceed only if no errors encountered. */
 2640         if (ret == 0) {
 2641                 /* Launch channels */
 2642                 while((sm = SLIST_FIRST(&sg->members)) != NULL) {
 2643                         SLIST_REMOVE_HEAD(&sg->members, link);
 2644 
 2645                         c = sm->ch;
 2646                         c->sm = NULL;
 2647                         chn_start(c, 1);
 2648                         c->flags &= ~CHN_F_NOTRIGGER;
 2649                         CHN_UNLOCK(c);
 2650 
 2651                         free(sm, M_DEVBUF);
 2652                 }
 2653 
 2654                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2655                 free(sg, M_DEVBUF);
 2656         }
 2657 
 2658         PCM_SG_UNLOCK();
 2659 
 2660         /*
 2661          * Free_unr() may sleep, so be sure to give up the syncgroup lock
 2662          * first.
 2663          */
 2664         if (ret == 0)
 2665                 free_unr(pcmsg_unrhdr, sg_id);
 2666 
 2667         return (ret);
 2668 }
 2669 
 2670 /**
 2671  * @brief Handler for SNDCTL_DSP_POLICY
 2672  *
 2673  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
 2674  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
 2675  * specifying those two parameters, s/he simply selects a number from 0..10
 2676  * which corresponds to a buffer size.  Smaller numbers request smaller
 2677  * buffers with lower latencies (at greater overhead from more frequent
 2678  * interrupts), while greater numbers behave in the opposite manner.
 2679  *
 2680  * The 4Front spec states that a value of 5 should be the default.  However,
 2681  * this implementation deviates slightly by using a linear scale without
 2682  * consulting drivers.  I.e., even though drivers may have different default
 2683  * buffer sizes, a policy argument of 5 will have the same result across
 2684  * all drivers.
 2685  *
 2686  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
 2687  * more information.
 2688  *
 2689  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
 2690  *       work with hardware drivers directly.
 2691  *
 2692  * @note PCM channel arguments must not be locked by caller.
 2693  *
 2694  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
 2695  * @param rdch  " recording channel (optional; may be NULL)
 2696  * @param policy Integer from [0:10]
 2697  *
 2698  * @retval 0    constant (for now)
 2699  */
 2700 static int
 2701 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
 2702 {
 2703         int ret;
 2704 
 2705         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
 2706                 return (EIO);
 2707 
 2708         /* Default: success */
 2709         ret = 0;
 2710 
 2711         if (rdch) {
 2712                 CHN_LOCK(rdch);
 2713                 ret = chn_setlatency(rdch, policy);
 2714                 CHN_UNLOCK(rdch);
 2715         }
 2716 
 2717         if (wrch && ret == 0) {
 2718                 CHN_LOCK(wrch);
 2719                 ret = chn_setlatency(wrch, policy);
 2720                 CHN_UNLOCK(wrch);
 2721         }
 2722 
 2723         if (ret)
 2724                 ret = EIO;
 2725 
 2726         return (ret);
 2727 }
 2728 
 2729 #ifdef OSSV4_EXPERIMENT
 2730 /**
 2731  * @brief Enable or disable "cooked" mode
 2732  *
 2733  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
 2734  * is the default, the sound system handles rate and format conversions
 2735  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
 2736  * operates with 44100Hz/16bit/signed samples).
 2737  *
 2738  * Disabling cooked mode is intended for applications wanting to mmap()
 2739  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
 2740  * feeder architecture, presumably to gain as much control over audio
 2741  * hardware as possible.
 2742  *
 2743  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
 2744  * for more details.
 2745  *
 2746  * @note Currently, this function is just a stub that always returns EINVAL.
 2747  *
 2748  * @todo Figure out how to and actually implement this.
 2749  *
 2750  * @param wrch          playback channel (optional; may be NULL)
 2751  * @param rdch          recording channel (optional; may be NULL)
 2752  * @param enabled       0 = raw mode, 1 = cooked mode
 2753  *
 2754  * @retval EINVAL       Operation not yet supported.
 2755  */
 2756 static int
 2757 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
 2758 {
 2759         return (EINVAL);
 2760 }
 2761 
 2762 /**
 2763  * @brief Retrieve channel interleaving order
 2764  *
 2765  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
 2766  *
 2767  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
 2768  * for more details.
 2769  *
 2770  * @note As the ioctl definition is still under construction, FreeBSD
 2771  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
 2772  *
 2773  * @param wrch  playback channel (optional; may be NULL)
 2774  * @param rdch  recording channel (optional; may be NULL)
 2775  * @param map   channel map (result will be stored there)
 2776  *
 2777  * @retval EINVAL       Operation not yet supported.
 2778  */
 2779 static int
 2780 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 2781 {
 2782         return (EINVAL);
 2783 }
 2784 
 2785 /**
 2786  * @brief Specify channel interleaving order
 2787  *
 2788  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
 2789  *
 2790  * @note As the ioctl definition is still under construction, FreeBSD
 2791  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
 2792  *
 2793  * @param wrch  playback channel (optional; may be NULL)
 2794  * @param rdch  recording channel (optional; may be NULL)
 2795  * @param map   channel map
 2796  *
 2797  * @retval EINVAL       Operation not yet supported.
 2798  */
 2799 static int
 2800 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 2801 {
 2802         return (EINVAL);
 2803 }
 2804 
 2805 /**
 2806  * @brief Retrieve an audio device's label
 2807  *
 2808  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
 2809  *
 2810  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 2811  * for more details.
 2812  *
 2813  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
 2814  * consoles) can show variable "labels" for certain controls. By default
 2815  * the application name (say quake) is shown as the label but
 2816  * applications may change the labels themselves."
 2817  *
 2818  * @note As the ioctl definition is still under construction, FreeBSD
 2819  *       does not currently support @c SNDCTL_GETLABEL.
 2820  *
 2821  * @param wrch  playback channel (optional; may be NULL)
 2822  * @param rdch  recording channel (optional; may be NULL)
 2823  * @param label label gets copied here
 2824  *
 2825  * @retval EINVAL       Operation not yet supported.
 2826  */
 2827 static int
 2828 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 2829 {
 2830         return (EINVAL);
 2831 }
 2832 
 2833 /**
 2834  * @brief Specify an audio device's label
 2835  *
 2836  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
 2837  * comments for @c dsp_oss_getlabel immediately above.
 2838  *
 2839  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 2840  * for more details.
 2841  *
 2842  * @note As the ioctl definition is still under construction, FreeBSD
 2843  *       does not currently support SNDCTL_SETLABEL.
 2844  *
 2845  * @param wrch  playback channel (optional; may be NULL)
 2846  * @param rdch  recording channel (optional; may be NULL)
 2847  * @param label label gets copied from here
 2848  *
 2849  * @retval EINVAL       Operation not yet supported.
 2850  */
 2851 static int
 2852 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 2853 {
 2854         return (EINVAL);
 2855 }
 2856 
 2857 /**
 2858  * @brief Retrieve name of currently played song
 2859  *
 2860  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
 2861  * tell the system the name of the currently playing song, which would be
 2862  * visible in @c /dev/sndstat.
 2863  *
 2864  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
 2865  * for more details.
 2866  *
 2867  * @note As the ioctl definition is still under construction, FreeBSD
 2868  *       does not currently support SNDCTL_GETSONG.
 2869  *
 2870  * @param wrch  playback channel (optional; may be NULL)
 2871  * @param rdch  recording channel (optional; may be NULL)
 2872  * @param song  song name gets copied here
 2873  *
 2874  * @retval EINVAL       Operation not yet supported.
 2875  */
 2876 static int
 2877 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 2878 {
 2879         return (EINVAL);
 2880 }
 2881 
 2882 /**
 2883  * @brief Retrieve name of currently played song
 2884  *
 2885  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
 2886  * tell the system the name of the currently playing song, which would be
 2887  * visible in @c /dev/sndstat.
 2888  *
 2889  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
 2890  * for more details.
 2891  *
 2892  * @note As the ioctl definition is still under construction, FreeBSD
 2893  *       does not currently support SNDCTL_SETSONG.
 2894  *
 2895  * @param wrch  playback channel (optional; may be NULL)
 2896  * @param rdch  recording channel (optional; may be NULL)
 2897  * @param song  song name gets copied from here
 2898  *
 2899  * @retval EINVAL       Operation not yet supported.
 2900  */
 2901 static int
 2902 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 2903 {
 2904         return (EINVAL);
 2905 }
 2906 
 2907 /**
 2908  * @brief Rename a device
 2909  *
 2910  * This is a handler for the @c SNDCTL_SETNAME ioctl.
 2911  *
 2912  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
 2913  * more details.
 2914  *
 2915  * From Hannu@4Front:  "This call is used to change the device name
 2916  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
 2917  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
 2918  * name depending on the current context (for example 'OSS virtual wave table
 2919  * synth' or 'VoIP link to London')."
 2920  *
 2921  * @note As the ioctl definition is still under construction, FreeBSD
 2922  *       does not currently support SNDCTL_SETNAME.
 2923  *
 2924  * @param wrch  playback channel (optional; may be NULL)
 2925  * @param rdch  recording channel (optional; may be NULL)
 2926  * @param name  new device name gets copied from here
 2927  *
 2928  * @retval EINVAL       Operation not yet supported.
 2929  */
 2930 static int
 2931 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
 2932 {
 2933         return (EINVAL);
 2934 }
 2935 #endif  /* !OSSV4_EXPERIMENT */

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