The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/vchan.c

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    1 /*-
    2  * Copyright (c) 2001 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 <dev/sound/pcm/vchan.h>
   29 #include "feeder_if.h"
   30 
   31 SND_DECLARE_FILE("$FreeBSD$");
   32 
   33 /*
   34  * Default speed
   35  */
   36 #define VCHAN_DEFAULT_SPEED     48000
   37 
   38 extern int feeder_rate_ratemin;
   39 extern int feeder_rate_ratemax;
   40 
   41 struct vchinfo {
   42         u_int32_t spd, fmt, blksz, bps, run;
   43         struct pcm_channel *channel, *parent;
   44         struct pcmchan_caps caps;
   45 };
   46 
   47 static u_int32_t vchan_fmt[] = {
   48         AFMT_STEREO | AFMT_S16_LE,
   49         0
   50 };
   51 
   52 static int
   53 vchan_mix_s16(int16_t *to, int16_t *tmp, unsigned int count)
   54 {
   55         /*
   56          * to is the output buffer, tmp is the input buffer
   57          * count is the number of 16bit samples to mix
   58          */
   59         int i;
   60         int x;
   61 
   62         for(i = 0; i < count; i++) {
   63                 x = to[i];
   64                 x += tmp[i];
   65                 if (x < -32768) {
   66                         /* printf("%d + %d = %d (u)\n", to[i], tmp[i], x); */
   67                         x = -32768;
   68                 }
   69                 if (x > 32767) {
   70                         /* printf("%d + %d = %d (o)\n", to[i], tmp[i], x); */
   71                         x = 32767;
   72                 }
   73                 to[i] = x & 0x0000ffff;
   74         }
   75         return 0;
   76 }
   77 
   78 static int
   79 feed_vchan_s16(struct pcm_feeder *f, struct pcm_channel *c, u_int8_t *b, u_int32_t count, void *source)
   80 {
   81         /* we're going to abuse things a bit */
   82         struct snd_dbuf *src = source;
   83         struct pcmchan_children *cce;
   84         struct pcm_channel *ch;
   85         uint32_t sz;
   86         int16_t *tmp, *dst;
   87         unsigned int cnt, rcnt = 0;
   88 
   89         #if 0
   90         if (sndbuf_getsize(src) < count)
   91                 panic("feed_vchan_s16(%s): tmp buffer size %d < count %d, flags = 0x%x",
   92                     c->name, sndbuf_getsize(src), count, c->flags);
   93         #endif
   94         sz = sndbuf_getsize(src);
   95         if (sz < count)
   96                 count = sz;
   97         count &= ~1;
   98         if (count < 2)
   99                 return 0;
  100         bzero(b, count);
  101 
  102         /*
  103          * we are going to use our source as a temporary buffer since it's
  104          * got no other purpose.  we obtain our data by traversing the channel
  105          * list of children and calling vchan_mix_* to mix count bytes from each
  106          * into our destination buffer, b
  107          */
  108         dst = (int16_t *)b;
  109         tmp = (int16_t *)sndbuf_getbuf(src);
  110         bzero(tmp, count);
  111         SLIST_FOREACH(cce, &c->children, link) {
  112                 ch = cce->channel;
  113                 CHN_LOCK(ch);
  114                 if (ch->flags & CHN_F_TRIGGERED) {
  115                         if (ch->flags & CHN_F_MAPPED)
  116                                 sndbuf_acquire(ch->bufsoft, NULL, sndbuf_getfree(ch->bufsoft));
  117                         cnt = FEEDER_FEED(ch->feeder, ch, (u_int8_t *)tmp, count, ch->bufsoft);
  118                         vchan_mix_s16(dst, tmp, cnt >> 1);
  119                         if (cnt > rcnt)
  120                                 rcnt = cnt;
  121                 }
  122                 CHN_UNLOCK(ch);
  123         }
  124 
  125         return rcnt & ~1;
  126 }
  127 
  128 static struct pcm_feederdesc feeder_vchan_s16_desc[] = {
  129         {FEEDER_MIXER, AFMT_S16_LE | AFMT_STEREO, AFMT_S16_LE | AFMT_STEREO, 0},
  130         {0},
  131 };
  132 static kobj_method_t feeder_vchan_s16_methods[] = {
  133         KOBJMETHOD(feeder_feed,         feed_vchan_s16),
  134         { 0, 0 }
  135 };
  136 FEEDER_DECLARE(feeder_vchan_s16, 2, NULL);
  137 
  138 /************************************************************/
  139 
  140 static void *
  141 vchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
  142 {
  143         struct vchinfo *ch;
  144         struct pcm_channel *parent = devinfo;
  145 
  146         KASSERT(dir == PCMDIR_PLAY, ("vchan_init: bad direction"));
  147         ch = malloc(sizeof(*ch), M_DEVBUF, M_WAITOK | M_ZERO);
  148         if (!ch)
  149                 return NULL;
  150         ch->parent = parent;
  151         ch->channel = c;
  152         ch->fmt = AFMT_U8;
  153         ch->spd = DSP_DEFAULT_SPEED;
  154         ch->blksz = 2048;
  155 
  156         c->flags |= CHN_F_VIRTUAL;
  157 
  158         return ch;
  159 }
  160 
  161 static int
  162 vchan_free(kobj_t obj, void *data)
  163 {
  164         free(data, M_DEVBUF);
  165         return 0;
  166 }
  167 
  168 static int
  169 vchan_setformat(kobj_t obj, void *data, u_int32_t format)
  170 {
  171         struct vchinfo *ch = data;
  172         struct pcm_channel *parent = ch->parent;
  173         struct pcm_channel *channel = ch->channel;
  174 
  175         ch->fmt = format;
  176         ch->bps = 1;
  177         ch->bps <<= (ch->fmt & AFMT_STEREO)? 1 : 0;
  178         if (ch->fmt & AFMT_16BIT)
  179                 ch->bps <<= 1;
  180         else if (ch->fmt & AFMT_24BIT)
  181                 ch->bps *= 3;
  182         else if (ch->fmt & AFMT_32BIT)
  183                 ch->bps <<= 2;
  184         CHN_UNLOCK(channel);
  185         chn_notify(parent, CHN_N_FORMAT);
  186         CHN_LOCK(channel);
  187         sndbuf_setfmt(channel->bufsoft, format);
  188         return 0;
  189 }
  190 
  191 static int
  192 vchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
  193 {
  194         struct vchinfo *ch = data;
  195         struct pcm_channel *parent = ch->parent;
  196         struct pcm_channel *channel = ch->channel;
  197 
  198         ch->spd = speed;
  199         CHN_UNLOCK(channel);
  200         CHN_LOCK(parent);
  201         speed = sndbuf_getspd(parent->bufsoft);
  202         CHN_UNLOCK(parent);
  203         CHN_LOCK(channel);
  204         return speed;
  205 }
  206 
  207 static int
  208 vchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
  209 {
  210         struct vchinfo *ch = data;
  211         struct pcm_channel *channel = ch->channel;
  212         struct pcm_channel *parent = ch->parent;
  213         /* struct pcm_channel *channel = ch->channel; */
  214         int prate, crate;
  215 
  216         ch->blksz = blocksize;
  217         /* CHN_UNLOCK(channel); */
  218         sndbuf_setblksz(channel->bufhard, blocksize);
  219         chn_notify(parent, CHN_N_BLOCKSIZE);
  220         CHN_LOCK(parent);
  221         /* CHN_LOCK(channel); */
  222 
  223         crate = ch->spd * ch->bps;
  224         prate = sndbuf_getspd(parent->bufsoft) * sndbuf_getbps(parent->bufsoft);
  225         blocksize = sndbuf_getblksz(parent->bufsoft);
  226         CHN_UNLOCK(parent);
  227         blocksize *= prate;
  228         blocksize /= crate;
  229 
  230         return blocksize;
  231 }
  232 
  233 static int
  234 vchan_trigger(kobj_t obj, void *data, int go)
  235 {
  236         struct vchinfo *ch = data;
  237         struct pcm_channel *parent = ch->parent;
  238         struct pcm_channel *channel = ch->channel;
  239 
  240         if (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD)
  241                 return 0;
  242 
  243         ch->run = (go == PCMTRIG_START)? 1 : 0;
  244         CHN_UNLOCK(channel);
  245         chn_notify(parent, CHN_N_TRIGGER);
  246         CHN_LOCK(channel);
  247 
  248         return 0;
  249 }
  250 
  251 static struct pcmchan_caps *
  252 vchan_getcaps(kobj_t obj, void *data)
  253 {
  254         struct vchinfo *ch = data;
  255 
  256         ch->caps.minspeed = sndbuf_getspd(ch->parent->bufsoft);
  257         ch->caps.maxspeed = ch->caps.minspeed;
  258         ch->caps.fmtlist = vchan_fmt;
  259         ch->caps.caps = 0;
  260 
  261         return &ch->caps;
  262 }
  263 
  264 static kobj_method_t vchan_methods[] = {
  265         KOBJMETHOD(channel_init,                vchan_init),
  266         KOBJMETHOD(channel_free,                vchan_free),
  267         KOBJMETHOD(channel_setformat,           vchan_setformat),
  268         KOBJMETHOD(channel_setspeed,            vchan_setspeed),
  269         KOBJMETHOD(channel_setblocksize,        vchan_setblocksize),
  270         KOBJMETHOD(channel_trigger,             vchan_trigger),
  271         KOBJMETHOD(channel_getcaps,             vchan_getcaps),
  272         { 0, 0 }
  273 };
  274 CHANNEL_DECLARE(vchan);
  275 
  276 #if 0
  277 /* 
  278  * On the fly vchan rate settings
  279  */
  280 #ifdef SND_DYNSYSCTL
  281 static int
  282 sysctl_hw_snd_vchanrate(SYSCTL_HANDLER_ARGS)
  283 {
  284         struct snddev_info *d;
  285         struct snddev_channel *sce;
  286         struct pcm_channel *c, *ch = NULL, *fake;
  287         struct pcmchan_caps *caps;
  288         int err = 0;
  289         int newspd = 0;
  290 
  291         d = oidp->oid_arg1;
  292         if (!(d->flags & SD_F_AUTOVCHAN) || d->vchancount < 1)
  293                 return EINVAL;
  294         if (pcm_inprog(d, 1) != 1 && req->newptr != NULL) {
  295                 pcm_inprog(d, -1);
  296                 return EINPROGRESS;
  297         }
  298         SLIST_FOREACH(sce, &d->channels, link) {
  299                 c = sce->channel;
  300                 CHN_LOCK(c);
  301                 if (c->direction == PCMDIR_PLAY) {
  302                         if (c->flags & CHN_F_VIRTUAL) {
  303                                 /* Sanity check */
  304                                 if (ch != NULL && ch != c->parentchannel) {
  305                                         CHN_UNLOCK(c);
  306                                         pcm_inprog(d, -1);
  307                                         return EINVAL;
  308                                 }
  309                                 if (req->newptr != NULL &&
  310                                                 (c->flags & CHN_F_BUSY)) {
  311                                         CHN_UNLOCK(c);
  312                                         pcm_inprog(d, -1);
  313                                         return EBUSY;
  314                                 }
  315                         } else if (c->flags & CHN_F_HAS_VCHAN) {
  316                                 /* No way!! */
  317                                 if (ch != NULL) {
  318                                         CHN_UNLOCK(c);
  319                                         pcm_inprog(d, -1);
  320                                         return EINVAL;
  321                                 }
  322                                 ch = c;
  323                                 newspd = ch->speed;
  324                         }
  325                 }
  326                 CHN_UNLOCK(c);
  327         }
  328         if (ch == NULL) {
  329                 pcm_inprog(d, -1);
  330                 return EINVAL;
  331         }
  332         err = sysctl_handle_int(oidp, &newspd, sizeof(newspd), req);
  333         if (err == 0 && req->newptr != NULL) {
  334                 if (newspd < 1 || newspd < feeder_rate_ratemin ||
  335                                 newspd > feeder_rate_ratemax) {
  336                         pcm_inprog(d, -1);
  337                         return EINVAL;
  338                 }
  339                 CHN_LOCK(ch);
  340                 caps = chn_getcaps(ch);
  341                 if (caps == NULL || newspd < caps->minspeed ||
  342                                 newspd > caps->maxspeed) {
  343                         CHN_UNLOCK(ch);
  344                         pcm_inprog(d, -1);
  345                         return EINVAL;
  346                 }
  347                 if (newspd != ch->speed) {
  348                         err = chn_setspeed(ch, newspd);
  349                         /*
  350                          * Try to avoid FEEDER_RATE on parent channel if the
  351                          * requested value is not supported by the hardware.
  352                          */
  353                         if (!err && (ch->feederflags & (1 << FEEDER_RATE))) {
  354                                 newspd = sndbuf_getspd(ch->bufhard);
  355                                 err = chn_setspeed(ch, newspd);
  356                         }
  357                         CHN_UNLOCK(ch);
  358                         if (err == 0) {
  359                                 fake = pcm_getfakechan(d);
  360                                 if (fake != NULL) {
  361                                         CHN_LOCK(fake);
  362                                         fake->speed = newspd;
  363                                         CHN_UNLOCK(fake);
  364                                 }
  365                         }
  366                 } else
  367                         CHN_UNLOCK(ch);
  368         }
  369         pcm_inprog(d, -1);
  370         return err;
  371 }
  372 #endif
  373 #endif
  374 
  375 /* virtual channel interface */
  376 
  377 int
  378 vchan_create(struct pcm_channel *parent)
  379 {
  380         struct snddev_info *d = parent->parentsnddev;
  381         struct pcmchan_children *pce;
  382         struct pcm_channel *child, *fake;
  383         struct pcmchan_caps *parent_caps;
  384         int err, first, speed = 0;
  385 
  386         if (!(parent->flags & CHN_F_BUSY))
  387                 return EBUSY;
  388 
  389 
  390         CHN_UNLOCK(parent);
  391 
  392         pce = malloc(sizeof(*pce), M_DEVBUF, M_WAITOK | M_ZERO);
  393         if (!pce) {
  394                 CHN_LOCK(parent);
  395                 return ENOMEM;
  396         }
  397 
  398         /* create a new playback channel */
  399         child = pcm_chn_create(d, parent, &vchan_class, PCMDIR_VIRTUAL, parent);
  400         if (!child) {
  401                 free(pce, M_DEVBUF);
  402                 CHN_LOCK(parent);
  403                 return ENODEV;
  404         }
  405         pce->channel = child;
  406 
  407         /* add us to our grandparent's channel list */
  408         /*
  409          * XXX maybe we shouldn't always add the dev_t
  410          */
  411         err = pcm_chn_add(d, child);
  412         if (err) {
  413                 pcm_chn_destroy(child);
  414                 free(pce, M_DEVBUF);
  415                 CHN_LOCK(parent);
  416                 return err;
  417         }
  418 
  419         CHN_LOCK(parent);
  420         /* add us to our parent channel's children */
  421         first = SLIST_EMPTY(&parent->children);
  422         SLIST_INSERT_HEAD(&parent->children, pce, link);
  423         parent->flags |= CHN_F_HAS_VCHAN;
  424 
  425         if (first) {
  426                 parent_caps = chn_getcaps(parent);
  427                 if (parent_caps == NULL)
  428                         err = EINVAL;
  429 
  430                 if (!err)
  431                         err = chn_reset(parent, AFMT_STEREO | AFMT_S16_LE);
  432 
  433                 if (!err) {
  434                         fake = pcm_getfakechan(d);
  435                         if (fake != NULL) {
  436                                 /*
  437                                  * Avoid querying kernel hint, use saved value
  438                                  * from fake channel.
  439                                  */
  440                                 CHN_UNLOCK(parent);
  441                                 CHN_LOCK(fake);
  442                                 speed = fake->speed;
  443                                 CHN_UNLOCK(fake);
  444                                 CHN_LOCK(parent);
  445                         }
  446 
  447                         /*
  448                          * This is very sad. Few soundcards advertised as being
  449                          * able to do (insanely) higher/lower speed, but in
  450                          * reality, they simply can't. At least, we give user chance
  451                          * to set sane value via kernel hints or sysctl.
  452                          */
  453                         if (speed < 1) {
  454                                 int r;
  455                                 CHN_UNLOCK(parent);
  456                                 r = resource_int_value(device_get_name(parent->dev),
  457                                                         device_get_unit(parent->dev),
  458                                                                 "vchanrate", &speed);
  459                                 CHN_LOCK(parent);
  460                                 if (r != 0) {
  461                                         /*
  462                                          * Workaround for sb16 running
  463                                          * poorly at 45k / 49k.
  464                                          */
  465                                         switch (parent_caps->maxspeed) {
  466                                         case 45000:
  467                                         case 49000:
  468                                                 speed = 44100;
  469                                                 break;
  470                                         default:
  471                                                 speed = VCHAN_DEFAULT_SPEED;
  472                                                 break;
  473                                         }
  474                                 }
  475                         }
  476 
  477                         /*
  478                          * Limit speed based on driver caps.
  479                          * This is supposed to help fixed rate, non-VRA
  480                          * AC97 cards, but.. (see below)
  481                          */
  482                         if (speed < parent_caps->minspeed)
  483                                 speed = parent_caps->minspeed;
  484                         if (speed > parent_caps->maxspeed)
  485                                 speed = parent_caps->maxspeed;
  486 
  487                         /*
  488                          * We still need to limit the speed between
  489                          * feeder_rate_ratemin <-> feeder_rate_ratemax. This is
  490                          * just an escape goat if all of the above failed
  491                          * miserably.
  492                          */
  493                         if (speed < feeder_rate_ratemin)
  494                                 speed = feeder_rate_ratemin;
  495                         if (speed > feeder_rate_ratemax)
  496                                 speed = feeder_rate_ratemax;
  497 
  498                         err = chn_setspeed(parent, speed);
  499                         /*
  500                          * Try to avoid FEEDER_RATE on parent channel if the
  501                          * requested value is not supported by the hardware.
  502                          */
  503                         if (!err && (parent->feederflags & (1 << FEEDER_RATE))) {
  504                                 speed = sndbuf_getspd(parent->bufhard);
  505                                 err = chn_setspeed(parent, speed);
  506                         }
  507 
  508                         if (!err && fake != NULL) {
  509                                 /*
  510                                  * Save new value to fake channel.
  511                                  */
  512                                 CHN_UNLOCK(parent);
  513                                 CHN_LOCK(fake);
  514                                 fake->speed = speed;
  515                                 CHN_UNLOCK(fake);
  516                                 CHN_LOCK(parent);
  517                         }
  518                 }
  519                 
  520                 if (err) {
  521                         SLIST_REMOVE(&parent->children, pce, pcmchan_children, link);
  522                         parent->flags &= ~CHN_F_HAS_VCHAN;
  523                         CHN_UNLOCK(parent);
  524                         free(pce, M_DEVBUF);
  525                         if (pcm_chn_remove(d, child) == 0)
  526                                 pcm_chn_destroy(child);
  527                         CHN_LOCK(parent);
  528                         return err;
  529                 }
  530         }
  531 
  532         return 0;
  533 }
  534 
  535 int
  536 vchan_destroy(struct pcm_channel *c)
  537 {
  538         struct pcm_channel *parent = c->parentchannel;
  539         struct snddev_info *d = parent->parentsnddev;
  540         struct pcmchan_children *pce;
  541         struct snddev_channel *sce;
  542         uint32_t spd;
  543         int err;
  544 
  545         CHN_LOCK(parent);
  546         if (!(parent->flags & CHN_F_BUSY)) {
  547                 CHN_UNLOCK(parent);
  548                 return EBUSY;
  549         }
  550         if (SLIST_EMPTY(&parent->children)) {
  551                 CHN_UNLOCK(parent);
  552                 return EINVAL;
  553         }
  554 
  555         /* remove us from our parent's children list */
  556         SLIST_FOREACH(pce, &parent->children, link) {
  557                 if (pce->channel == c)
  558                         goto gotch;
  559         }
  560         CHN_UNLOCK(parent);
  561         return EINVAL;
  562 gotch:
  563         SLIST_FOREACH(sce, &d->channels, link) {
  564                 if (sce->channel == c) {
  565                         if (sce->dsp_devt) {
  566                                 destroy_dev(sce->dsp_devt);
  567                                 sce->dsp_devt = NULL;
  568                         }
  569                         if (sce->dspW_devt) {
  570                                 destroy_dev(sce->dspW_devt);
  571                                 sce->dspW_devt = NULL;
  572                         }
  573                         if (sce->audio_devt) {
  574                                 destroy_dev(sce->audio_devt);
  575                                 sce->audio_devt = NULL;
  576                         }
  577                         if (sce->dspr_devt) {
  578                                 destroy_dev(sce->dspr_devt);
  579                                 sce->dspr_devt = NULL;
  580                         }
  581                         d->devcount--;
  582                         break;
  583                 }
  584         }
  585         SLIST_REMOVE(&parent->children, pce, pcmchan_children, link);
  586         free(pce, M_DEVBUF);
  587 
  588         if (SLIST_EMPTY(&parent->children)) {
  589                 parent->flags &= ~(CHN_F_BUSY | CHN_F_HAS_VCHAN);
  590                 spd = parent->speed;
  591                 if (chn_reset(parent, parent->format) == 0)
  592                         chn_setspeed(parent, spd);
  593         }
  594 
  595         /* remove us from our grandparent's channel list */
  596         err = pcm_chn_remove(d, c);
  597 
  598         CHN_UNLOCK(parent);
  599         /* destroy ourselves */
  600         if (!err)
  601                 err = pcm_chn_destroy(c);
  602 
  603         return err;
  604 }
  605 
  606 int
  607 vchan_initsys(device_t dev)
  608 {
  609 #ifdef SND_DYNSYSCTL
  610         struct snddev_info *d;
  611 
  612         d = device_get_softc(dev);
  613         SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
  614             OID_AUTO, "vchans", CTLTYPE_INT | CTLFLAG_RW, d, sizeof(d),
  615             sysctl_hw_snd_vchans, "I", "");
  616 #if 0
  617         SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
  618             OID_AUTO, "vchanrate", CTLTYPE_INT | CTLFLAG_RW, d, sizeof(d),
  619             sysctl_hw_snd_vchanrate, "I", "");
  620 #endif
  621 #endif
  622 
  623         return 0;
  624 }

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