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/dsp.c

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    1 /*-
    2  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifdef HAVE_KERNEL_OPTION_HEADERS
   30 #include "opt_snd.h"
   31 #endif
   32 
   33 #include <dev/sound/pcm/sound.h>
   34 #include <sys/ctype.h>
   35 #include <sys/lock.h>
   36 #include <sys/rwlock.h>
   37 #include <sys/sysent.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/vm_object.h>
   41 #include <vm/vm_page.h>
   42 #include <vm/vm_pager.h>
   43 
   44 SND_DECLARE_FILE("$FreeBSD: releng/10.1/sys/dev/sound/pcm/dsp.c 249585 2013-04-17 11:45:15Z gabor $");
   45 
   46 static int dsp_mmap_allow_prot_exec = 0;
   47 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
   48     &dsp_mmap_allow_prot_exec, 0,
   49     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
   50 
   51 struct dsp_cdevinfo {
   52         struct pcm_channel *rdch, *wrch;
   53         struct pcm_channel *volch;
   54         int busy, simplex;
   55         TAILQ_ENTRY(dsp_cdevinfo) link;
   56 };
   57 
   58 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
   59 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
   60 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
   61 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
   62 
   63 #define DSP_CDEVINFO_CACHESIZE  8
   64 
   65 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
   66                                  (y) != NULL && (y)->si_drv1 != NULL)
   67 
   68 #define OLDPCM_IOCTL
   69 
   70 static d_open_t dsp_open;
   71 static d_close_t dsp_close;
   72 static d_read_t dsp_read;
   73 static d_write_t dsp_write;
   74 static d_ioctl_t dsp_ioctl;
   75 static d_poll_t dsp_poll;
   76 static d_mmap_t dsp_mmap;
   77 static d_mmap_single_t dsp_mmap_single;
   78 
   79 struct cdevsw dsp_cdevsw = {
   80         .d_version =    D_VERSION,
   81         .d_open =       dsp_open,
   82         .d_close =      dsp_close,
   83         .d_read =       dsp_read,
   84         .d_write =      dsp_write,
   85         .d_ioctl =      dsp_ioctl,
   86         .d_poll =       dsp_poll,
   87         .d_mmap =       dsp_mmap,
   88         .d_mmap_single = dsp_mmap_single,
   89         .d_name =       "dsp",
   90 };
   91 
   92 static eventhandler_tag dsp_ehtag = NULL;
   93 static int dsp_umax = -1;
   94 static int dsp_cmax = -1;
   95 
   96 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
   97 static int dsp_oss_syncstart(int sg_id);
   98 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
   99 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
  100 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  101 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  102 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
  103 #ifdef OSSV4_EXPERIMENT
  104 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  105 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  106 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  107 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  108 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
  109 #endif
  110 
  111 static struct snddev_info *
  112 dsp_get_info(struct cdev *dev)
  113 {
  114         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
  115 }
  116 
  117 static uint32_t
  118 dsp_get_flags(struct cdev *dev)
  119 {
  120         device_t bdev;
  121 
  122         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  123 
  124         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
  125 }
  126 
  127 static void
  128 dsp_set_flags(struct cdev *dev, uint32_t flags)
  129 {
  130         device_t bdev;
  131 
  132         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  133 
  134         if (bdev != NULL)
  135                 pcm_setflags(bdev, flags);
  136 }
  137 
  138 /*
  139  * return the channels associated with an open device instance.
  140  * lock channels specified.
  141  */
  142 static int
  143 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
  144     uint32_t prio)
  145 {
  146         struct snddev_info *d;
  147         struct pcm_channel *ch;
  148         uint32_t flags;
  149 
  150         if (PCM_SIMPLEX(dev) != 0) {
  151                 d = dsp_get_info(dev);
  152                 if (!PCM_REGISTERED(d))
  153                         return (ENXIO);
  154                 PCM_LOCK(d);
  155                 PCM_WAIT(d);
  156                 PCM_ACQUIRE(d);
  157                 /*
  158                  * Note: order is important -
  159                  *       pcm flags -> prio query flags -> wild guess
  160                  */
  161                 ch = NULL;
  162                 flags = dsp_get_flags(dev);
  163                 if (flags & SD_F_PRIO_WR) {
  164                         ch = PCM_RDCH(dev);
  165                         PCM_RDCH(dev) = NULL;
  166                 } else if (flags & SD_F_PRIO_RD) {
  167                         ch = PCM_WRCH(dev);
  168                         PCM_WRCH(dev) = NULL;
  169                 } else if (prio & SD_F_PRIO_WR) {
  170                         ch = PCM_RDCH(dev);
  171                         PCM_RDCH(dev) = NULL;
  172                         flags |= SD_F_PRIO_WR;
  173                 } else if (prio & SD_F_PRIO_RD) {
  174                         ch = PCM_WRCH(dev);
  175                         PCM_WRCH(dev) = NULL;
  176                         flags |= SD_F_PRIO_RD;
  177                 } else if (PCM_WRCH(dev) != NULL) {
  178                         ch = PCM_RDCH(dev);
  179                         PCM_RDCH(dev) = NULL;
  180                         flags |= SD_F_PRIO_WR;
  181                 } else if (PCM_RDCH(dev) != NULL) {
  182                         ch = PCM_WRCH(dev);
  183                         PCM_WRCH(dev) = NULL;
  184                         flags |= SD_F_PRIO_RD;
  185                 }
  186                 PCM_SIMPLEX(dev) = 0;
  187                 dsp_set_flags(dev, flags);
  188                 if (ch != NULL) {
  189                         CHN_LOCK(ch);
  190                         pcm_chnref(ch, -1);
  191                         pcm_chnrelease(ch);
  192                 }
  193                 PCM_RELEASE(d);
  194                 PCM_UNLOCK(d);
  195         }
  196 
  197         *rdch = PCM_RDCH(dev);
  198         *wrch = PCM_WRCH(dev);
  199 
  200         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
  201                 CHN_LOCK(*rdch);
  202         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
  203                 CHN_LOCK(*wrch);
  204 
  205         return (0);
  206 }
  207 
  208 /* unlock specified channels */
  209 static void
  210 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
  211     uint32_t prio)
  212 {
  213         if (wrch != NULL && (prio & SD_F_PRIO_WR))
  214                 CHN_UNLOCK(wrch);
  215         if (rdch != NULL && (prio & SD_F_PRIO_RD))
  216                 CHN_UNLOCK(rdch);
  217 }
  218 
  219 static void
  220 dsp_cdevinfo_alloc(struct cdev *dev,
  221     struct pcm_channel *rdch, struct pcm_channel *wrch,
  222     struct pcm_channel *volch)
  223 {
  224         struct snddev_info *d;
  225         struct dsp_cdevinfo *cdi;
  226         int simplex;
  227 
  228         d = dsp_get_info(dev);
  229 
  230         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
  231             ((rdch == NULL && wrch == NULL) || rdch != wrch),
  232             ("bogus %s(), what are you trying to accomplish here?", __func__));
  233         PCM_BUSYASSERT(d);
  234         PCM_LOCKASSERT(d);
  235 
  236         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
  237 
  238         /*
  239          * Scan for free instance entry and put it into the end of list.
  240          * Create new one if necessary.
  241          */
  242         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
  243                 if (cdi->busy != 0)
  244                         break;
  245                 cdi->rdch = rdch;
  246                 cdi->wrch = wrch;
  247                 cdi->volch = volch;
  248                 cdi->simplex = simplex;
  249                 cdi->busy = 1;
  250                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  251                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  252                 dev->si_drv1 = cdi;
  253                 return;
  254         }
  255         PCM_UNLOCK(d);
  256         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  257         PCM_LOCK(d);
  258         cdi->rdch = rdch;
  259         cdi->wrch = wrch;
  260         cdi->volch = volch;
  261         cdi->simplex = simplex;
  262         cdi->busy = 1;
  263         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  264         dev->si_drv1 = cdi;
  265 }
  266 
  267 static void
  268 dsp_cdevinfo_free(struct cdev *dev)
  269 {
  270         struct snddev_info *d;
  271         struct dsp_cdevinfo *cdi, *tmp;
  272         uint32_t flags;
  273         int i;
  274 
  275         d = dsp_get_info(dev);
  276 
  277         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
  278             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
  279             PCM_VOLCH(dev) == NULL,
  280             ("bogus %s(), what are you trying to accomplish here?", __func__));
  281         PCM_BUSYASSERT(d);
  282         PCM_LOCKASSERT(d);
  283 
  284         cdi = dev->si_drv1;
  285         dev->si_drv1 = NULL;
  286         cdi->rdch = NULL;
  287         cdi->wrch = NULL;
  288         cdi->volch = NULL;
  289         cdi->simplex = 0;
  290         cdi->busy = 0;
  291 
  292         /*
  293          * Once it is free, move it back to the beginning of list for
  294          * faster new entry allocation.
  295          */
  296         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  297         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  298 
  299         /*
  300          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
  301          * Reset simplex flags.
  302          */
  303         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
  304         i = DSP_CDEVINFO_CACHESIZE;
  305         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
  306                 if (cdi->busy != 0) {
  307                         if (cdi->simplex == 0) {
  308                                 if (cdi->rdch != NULL)
  309                                         flags |= SD_F_PRIO_RD;
  310                                 if (cdi->wrch != NULL)
  311                                         flags |= SD_F_PRIO_WR;
  312                         }
  313                 } else {
  314                         if (i == 0) {
  315                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  316                                 free(cdi, M_DEVBUF);
  317                         } else
  318                                 i--;
  319                 }
  320         }
  321         dsp_set_flags(dev, flags);
  322 }
  323 
  324 void
  325 dsp_cdevinfo_init(struct snddev_info *d)
  326 {
  327         struct dsp_cdevinfo *cdi;
  328         int i;
  329 
  330         KASSERT(d != NULL, ("NULL snddev_info"));
  331         PCM_BUSYASSERT(d);
  332         PCM_UNLOCKASSERT(d);
  333 
  334         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  335         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
  336                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  337                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  338         }
  339 }
  340 
  341 void
  342 dsp_cdevinfo_flush(struct snddev_info *d)
  343 {
  344         struct dsp_cdevinfo *cdi, *tmp;
  345 
  346         KASSERT(d != NULL, ("NULL snddev_info"));
  347         PCM_BUSYASSERT(d);
  348         PCM_UNLOCKASSERT(d);
  349 
  350         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
  351         while (cdi != NULL) {
  352                 tmp = TAILQ_NEXT(cdi, link);
  353                 free(cdi, M_DEVBUF);
  354                 cdi = tmp;
  355         }
  356         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  357 }
  358 
  359 /* duplex / simplex cdev type */
  360 enum {
  361         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
  362         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
  363         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
  364 };
  365 
  366 enum {
  367         DSP_CDEV_VOLCTL_NONE,
  368         DSP_CDEV_VOLCTL_READ,
  369         DSP_CDEV_VOLCTL_WRITE
  370 };
  371 
  372 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
  373 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
  374 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
  375 #define DSP_F_READ(x)           ((x) & FREAD)
  376 #define DSP_F_WRITE(x)          ((x) & FWRITE)
  377 
  378 static const struct {
  379         int type;
  380         char *name;
  381         char *sep;
  382         char *alias;
  383         int use_sep;
  384         int hw;
  385         int max;
  386         int volctl;
  387         uint32_t fmt, spd;
  388         int query;
  389 } dsp_cdevs[] = {
  390         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
  391           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  392           DSP_CDEV_TYPE_RDWR },
  393         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
  394           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
  395           DSP_CDEV_TYPE_RDWR },
  396         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
  397           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
  398           DSP_CDEV_TYPE_RDWR },
  399         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
  400           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  401         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
  402           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  403         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
  404           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  405         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
  406           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  407         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
  408           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
  409         /* Low priority, OSSv4 aliases. */
  410         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
  411           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  412           DSP_CDEV_TYPE_RDWR },
  413         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
  414           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  415           DSP_CDEV_TYPE_RDWR },
  416         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
  417           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  418           DSP_CDEV_TYPE_RDWR },
  419         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
  420           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  421           DSP_CDEV_TYPE_RDWR },
  422         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
  423           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  424           DSP_CDEV_TYPE_RDWR },
  425 };
  426 
  427 #define DSP_FIXUP_ERROR()               do {                            \
  428         prio = dsp_get_flags(i_dev);                                    \
  429         if (!DSP_F_VALID(flags))                                        \
  430                 error = EINVAL;                                         \
  431         if (!DSP_F_DUPLEX(flags) &&                                     \
  432             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
  433             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
  434                 error = ENOTSUP;                                        \
  435         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
  436             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
  437             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
  438                 error = EBUSY;                                          \
  439         else if (DSP_REGISTERED(d, i_dev))                              \
  440                 error = EBUSY;                                          \
  441 } while (0)
  442 
  443 static int
  444 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  445 {
  446         struct pcm_channel *rdch, *wrch;
  447         struct snddev_info *d;
  448         uint32_t fmt, spd, prio, volctl;
  449         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
  450 
  451         /* Kind of impossible.. */
  452         if (i_dev == NULL || td == NULL)
  453                 return (ENODEV);
  454 
  455         d = dsp_get_info(i_dev);
  456         if (!PCM_REGISTERED(d))
  457                 return (EBADF);
  458 
  459         PCM_GIANT_ENTER(d);
  460 
  461         /* Lock snddev so nobody else can monkey with it. */
  462         PCM_LOCK(d);
  463         PCM_WAIT(d);
  464 
  465         /*
  466          * Try to acquire cloned device before someone else pick it.
  467          * ENODEV means this is not a cloned droids.
  468          */
  469         error = snd_clone_acquire(i_dev);
  470         if (!(error == 0 || error == ENODEV)) {
  471                 DSP_FIXUP_ERROR();
  472                 PCM_UNLOCK(d);
  473                 PCM_GIANT_EXIT(d);
  474                 return (error);
  475         }
  476 
  477         error = 0;
  478         DSP_FIXUP_ERROR();
  479 
  480         if (error != 0) {
  481                 (void)snd_clone_release(i_dev);
  482                 PCM_UNLOCK(d);
  483                 PCM_GIANT_EXIT(d);
  484                 return (error);
  485         }
  486 
  487         /*
  488          * That is just enough. Acquire and unlock pcm lock so
  489          * the other will just have to wait until we finish doing
  490          * everything.
  491          */
  492         PCM_ACQUIRE(d);
  493         PCM_UNLOCK(d);
  494 
  495         devtype = PCMDEV(i_dev);
  496         wdevunit = -1;
  497         rdevunit = -1;
  498         fmt = 0;
  499         spd = 0;
  500         volctl = DSP_CDEV_VOLCTL_NONE;
  501 
  502         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
  503                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
  504                         continue;
  505                 /*
  506                  * Volume control only valid for DSPHW devices,
  507                  * and it must be opened in opposite direction be it
  508                  * simplex or duplex. Anything else will be handled
  509                  * as usual.
  510                  */
  511                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
  512                         if (dsp_cdevs[i].volctl != 0 &&
  513                             DSP_F_READ(flags)) {
  514                                 volctl = DSP_CDEV_VOLCTL_WRITE;
  515                                 flags &= ~FREAD;
  516                                 flags |= FWRITE;
  517                         }
  518                         if (DSP_F_READ(flags)) {
  519                                 (void)snd_clone_release(i_dev);
  520                                 PCM_RELEASE_QUICK(d);
  521                                 PCM_GIANT_EXIT(d);
  522                                 return (ENOTSUP);
  523                         }
  524                         wdevunit = dev2unit(i_dev);
  525                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
  526                         if (dsp_cdevs[i].volctl != 0 &&
  527                             DSP_F_WRITE(flags)) {
  528                                 volctl = DSP_CDEV_VOLCTL_READ;
  529                                 flags &= ~FWRITE;
  530                                 flags |= FREAD;
  531                         }
  532                         if (DSP_F_WRITE(flags)) {
  533                                 (void)snd_clone_release(i_dev);
  534                                 PCM_RELEASE_QUICK(d);
  535                                 PCM_GIANT_EXIT(d);
  536                                 return (ENOTSUP);
  537                         }
  538                         rdevunit = dev2unit(i_dev);
  539                 }
  540                 fmt = dsp_cdevs[i].fmt;
  541                 spd = dsp_cdevs[i].spd;
  542                 break;
  543         }
  544 
  545         /* No matching devtype? */
  546         if (fmt == 0 || spd == 0)
  547                 panic("impossible devtype %d", devtype);
  548 
  549         rdch = NULL;
  550         wrch = NULL;
  551         rderror = 0;
  552         wrerror = 0;
  553 
  554         /*
  555          * if we get here, the open request is valid- either:
  556          *   * we were previously not open
  557          *   * we were open for play xor record and the opener wants
  558          *     the non-open direction
  559          */
  560         if (DSP_F_READ(flags)) {
  561                 /* open for read */
  562                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
  563                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
  564 
  565                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
  566                         rderror = ENXIO;
  567 
  568                 if (volctl == DSP_CDEV_VOLCTL_READ)
  569                         rderror = 0;
  570 
  571                 if (rderror != 0) {
  572                         if (rdch != NULL)
  573                                 pcm_chnrelease(rdch);
  574                         if (!DSP_F_DUPLEX(flags)) {
  575                                 (void)snd_clone_release(i_dev);
  576                                 PCM_RELEASE_QUICK(d);
  577                                 PCM_GIANT_EXIT(d);
  578                                 return (rderror);
  579                         }
  580                         rdch = NULL;
  581                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
  582                         if (rdch != NULL) {
  583                                 pcm_chnref(rdch, 1);
  584                                 pcm_chnrelease(rdch);
  585                         }
  586                 } else {
  587                         if (flags & O_NONBLOCK)
  588                                 rdch->flags |= CHN_F_NBIO;
  589                         if (flags & O_EXCL)
  590                                 rdch->flags |= CHN_F_EXCLUSIVE;
  591                         pcm_chnref(rdch, 1);
  592                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  593                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
  594                         CHN_UNLOCK(rdch);
  595                 }
  596         }
  597 
  598         if (DSP_F_WRITE(flags)) {
  599                 /* open for write */
  600                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
  601                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
  602 
  603                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
  604                         wrerror = ENXIO;
  605 
  606                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
  607                         wrerror = 0;
  608 
  609                 if (wrerror != 0) {
  610                         if (wrch != NULL)
  611                                 pcm_chnrelease(wrch);
  612                         if (!DSP_F_DUPLEX(flags)) {
  613                                 if (rdch != NULL) {
  614                                         /*
  615                                          * Lock, deref and release previously
  616                                          * created record channel
  617                                          */
  618                                         CHN_LOCK(rdch);
  619                                         pcm_chnref(rdch, -1);
  620                                         pcm_chnrelease(rdch);
  621                                 }
  622                                 (void)snd_clone_release(i_dev);
  623                                 PCM_RELEASE_QUICK(d);
  624                                 PCM_GIANT_EXIT(d);
  625                                 return (wrerror);
  626                         }
  627                         wrch = NULL;
  628                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
  629                         if (wrch != NULL) {
  630                                 pcm_chnref(wrch, 1);
  631                                 pcm_chnrelease(wrch);
  632                         }
  633                 } else {
  634                         if (flags & O_NONBLOCK)
  635                                 wrch->flags |= CHN_F_NBIO;
  636                         if (flags & O_EXCL)
  637                                 wrch->flags |= CHN_F_EXCLUSIVE;
  638                         pcm_chnref(wrch, 1);
  639                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  640                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
  641                         CHN_UNLOCK(wrch);
  642                 }
  643         }
  644 
  645 
  646         PCM_LOCK(d);
  647 
  648         /*
  649          * We're done. Allocate channels information for this cdev.
  650          */
  651         switch (volctl) {
  652         case DSP_CDEV_VOLCTL_READ:
  653                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
  654                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
  655                 break;
  656         case DSP_CDEV_VOLCTL_WRITE:
  657                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
  658                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
  659                 break;
  660         case DSP_CDEV_VOLCTL_NONE:
  661         default:
  662                 if (wrch == NULL && rdch == NULL) {
  663                         (void)snd_clone_release(i_dev);
  664                         PCM_RELEASE(d);
  665                         PCM_UNLOCK(d);
  666                         PCM_GIANT_EXIT(d);
  667                         if (wrerror != 0)
  668                                 return (wrerror);
  669                         if (rderror != 0)
  670                                 return (rderror);
  671                         return (EINVAL);
  672                 }
  673                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
  674                 if (rdch != NULL)
  675                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
  676                 if (wrch != NULL)
  677                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
  678                 break;
  679         }
  680 
  681         /*
  682          * Increase clone refcount for its automatic garbage collector.
  683          */
  684         (void)snd_clone_ref(i_dev);
  685 
  686         PCM_RELEASE(d);
  687         PCM_UNLOCK(d);
  688 
  689         PCM_GIANT_LEAVE(d);
  690 
  691         return (0);
  692 }
  693 
  694 static int
  695 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  696 {
  697         struct pcm_channel *rdch, *wrch, *volch;
  698         struct snddev_info *d;
  699         int sg_ids, rdref, wdref;
  700 
  701         d = dsp_get_info(i_dev);
  702         if (!DSP_REGISTERED(d, i_dev))
  703                 return (EBADF);
  704 
  705         PCM_GIANT_ENTER(d);
  706 
  707         PCM_LOCK(d);
  708         PCM_WAIT(d);
  709         PCM_ACQUIRE(d);
  710 
  711         rdch = PCM_RDCH(i_dev);
  712         wrch = PCM_WRCH(i_dev);
  713         volch = PCM_VOLCH(i_dev);
  714 
  715         PCM_RDCH(i_dev) = NULL;
  716         PCM_WRCH(i_dev) = NULL;
  717         PCM_VOLCH(i_dev) = NULL;
  718 
  719         rdref = -1;
  720         wdref = -1;
  721 
  722         if (volch != NULL) {
  723                 if (volch == rdch)
  724                         rdref--;
  725                 else if (volch == wrch)
  726                         wdref--;
  727                 else {
  728                         CHN_LOCK(volch);
  729                         pcm_chnref(volch, -1);
  730                         CHN_UNLOCK(volch);
  731                 }
  732         }
  733 
  734         if (rdch != NULL)
  735                 CHN_REMOVE(d, rdch, channels.pcm.opened);
  736         if (wrch != NULL)
  737                 CHN_REMOVE(d, wrch, channels.pcm.opened);
  738 
  739         if (rdch != NULL || wrch != NULL) {
  740                 PCM_UNLOCK(d);
  741                 if (rdch != NULL) {
  742                         /*
  743                          * The channel itself need not be locked because:
  744                          *   a)  Adding a channel to a syncgroup happens only
  745                          *       in dsp_ioctl(), which cannot run concurrently
  746                          *       to dsp_close().
  747                          *   b)  The syncmember pointer (sm) is protected by
  748                          *       the global syncgroup list lock.
  749                          *   c)  A channel can't just disappear, invalidating
  750                          *       pointers, unless it's closed/dereferenced
  751                          *       first.
  752                          */
  753                         PCM_SG_LOCK();
  754                         sg_ids = chn_syncdestroy(rdch);
  755                         PCM_SG_UNLOCK();
  756                         if (sg_ids != 0)
  757                                 free_unr(pcmsg_unrhdr, sg_ids);
  758 
  759                         CHN_LOCK(rdch);
  760                         pcm_chnref(rdch, rdref);
  761                         chn_abort(rdch); /* won't sleep */
  762                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  763                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  764                         chn_reset(rdch, 0, 0);
  765                         pcm_chnrelease(rdch);
  766                 }
  767                 if (wrch != NULL) {
  768                         /*
  769                          * Please see block above.
  770                          */
  771                         PCM_SG_LOCK();
  772                         sg_ids = chn_syncdestroy(wrch);
  773                         PCM_SG_UNLOCK();
  774                         if (sg_ids != 0)
  775                                 free_unr(pcmsg_unrhdr, sg_ids);
  776 
  777                         CHN_LOCK(wrch);
  778                         pcm_chnref(wrch, wdref);
  779                         chn_flush(wrch); /* may sleep */
  780                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  781                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  782                         chn_reset(wrch, 0, 0);
  783                         pcm_chnrelease(wrch);
  784                 }
  785                 PCM_LOCK(d);
  786         }
  787 
  788         dsp_cdevinfo_free(i_dev);
  789         /*
  790          * Release clone busy state and unref it so the automatic
  791          * garbage collector will get the hint and do the remaining
  792          * cleanup process.
  793          */
  794         (void)snd_clone_release(i_dev);
  795 
  796         /*
  797          * destroy_dev() might sleep, so release pcm lock
  798          * here and rely on pcm cv serialization.
  799          */
  800         PCM_UNLOCK(d);
  801         (void)snd_clone_unref(i_dev);
  802         PCM_LOCK(d);
  803 
  804         PCM_RELEASE(d);
  805         PCM_UNLOCK(d);
  806 
  807         PCM_GIANT_LEAVE(d);
  808 
  809         return (0);
  810 }
  811 
  812 static __inline int
  813 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
  814 {
  815         struct snddev_info *d;
  816         struct pcm_channel **ch, *rdch, *wrch;
  817         int (*chn_io)(struct pcm_channel *, struct uio *);
  818         int prio, ret;
  819         pid_t runpid;
  820 
  821         KASSERT(i_dev != NULL && buf != NULL &&
  822             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
  823             ("%s(): io train wreck!", __func__));
  824 
  825         d = dsp_get_info(i_dev);
  826         if (!DSP_REGISTERED(d, i_dev))
  827                 return (EBADF);
  828 
  829         PCM_GIANT_ENTER(d);
  830 
  831         switch (buf->uio_rw) {
  832         case UIO_READ:
  833                 prio = SD_F_PRIO_RD;
  834                 ch = &rdch;
  835                 chn_io = chn_read;
  836                 break;
  837         case UIO_WRITE:
  838                 prio = SD_F_PRIO_WR;
  839                 ch = &wrch;
  840                 chn_io = chn_write;
  841                 break;
  842         default:
  843                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
  844                 break;
  845         }
  846 
  847         rdch = NULL;
  848         wrch = NULL;
  849         runpid = buf->uio_td->td_proc->p_pid;
  850 
  851         getchns(i_dev, &rdch, &wrch, prio);
  852 
  853         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
  854                 PCM_GIANT_EXIT(d);
  855                 return (EBADF);
  856         }
  857 
  858         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
  859             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
  860                 relchns(i_dev, rdch, wrch, prio);
  861                 PCM_GIANT_EXIT(d);
  862                 return (EINVAL);
  863         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
  864                 (*ch)->flags |= CHN_F_RUNNING;
  865                 (*ch)->pid = runpid;
  866         }
  867 
  868         /*
  869          * chn_read/write must give up channel lock in order to copy bytes
  870          * from/to userland, so up the "in progress" counter to make sure
  871          * someone else doesn't come along and muss up the buffer.
  872          */
  873         ++(*ch)->inprog;
  874         ret = chn_io(*ch, buf);
  875         --(*ch)->inprog;
  876 
  877         CHN_BROADCAST(&(*ch)->cv);
  878 
  879         relchns(i_dev, rdch, wrch, prio);
  880 
  881         PCM_GIANT_LEAVE(d);
  882 
  883         return (ret);
  884 }
  885 
  886 static int
  887 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
  888 {
  889         return (dsp_io_ops(i_dev, buf));
  890 }
  891 
  892 static int
  893 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
  894 {
  895         return (dsp_io_ops(i_dev, buf));
  896 }
  897 
  898 static int
  899 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
  900 {
  901         struct snddev_info *d;
  902         struct pcm_channel *c;
  903         int unit;
  904 
  905         KASSERT(dev != NULL && volch != NULL,
  906             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
  907 
  908         d = dsp_get_info(dev);
  909         if (!PCM_REGISTERED(d)) {
  910                 *volch = NULL;
  911                 return (EINVAL);
  912         }
  913 
  914         PCM_UNLOCKASSERT(d);
  915 
  916         *volch = NULL;
  917 
  918         c = PCM_VOLCH(dev);
  919         if (c != NULL) {
  920                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
  921                         return (-1);
  922                 *volch = c;
  923                 return (0);
  924         }
  925 
  926         PCM_LOCK(d);
  927         PCM_WAIT(d);
  928         PCM_ACQUIRE(d);
  929 
  930         unit = dev2unit(dev);
  931 
  932         CHN_FOREACH(c, d, channels.pcm) {
  933                 CHN_LOCK(c);
  934                 if (c->unit != unit) {
  935                         CHN_UNLOCK(c);
  936                         continue;
  937                 }
  938                 *volch = c;
  939                 pcm_chnref(c, 1);
  940                 PCM_VOLCH(dev) = c;
  941                 CHN_UNLOCK(c);
  942                 PCM_RELEASE(d);
  943                 PCM_UNLOCK(d);
  944                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
  945         }
  946 
  947         PCM_RELEASE(d);
  948         PCM_UNLOCK(d);
  949 
  950         return (EINVAL);
  951 }
  952 
  953 static int
  954 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
  955     caddr_t arg)
  956 {
  957         struct snddev_info *d;
  958         struct pcm_channel *rdch, *wrch;
  959         int j, devtype, ret;
  960 
  961         d = dsp_get_info(dev);
  962         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
  963                 return (-1);
  964 
  965         PCM_UNLOCKASSERT(d);
  966 
  967         j = cmd & 0xff;
  968 
  969         rdch = PCM_RDCH(dev);
  970         wrch = PCM_WRCH(dev);
  971 
  972         /* No specific channel, look into cache */
  973         if (volch == NULL)
  974                 volch = PCM_VOLCH(dev);
  975 
  976         /* Look harder */
  977         if (volch == NULL) {
  978                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
  979                         volch = rdch;
  980                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
  981                         volch = wrch;
  982         }
  983 
  984         devtype = PCMDEV(dev);
  985 
  986         /* Look super harder */
  987         if (volch == NULL &&
  988             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
  989             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
  990                 ret = dsp_get_volume_channel(dev, &volch);
  991                 if (ret != 0)
  992                         return (ret);
  993                 if (volch == NULL)
  994                         return (EINVAL);
  995         }
  996 
  997         /* Final validation */
  998         if (volch != NULL) {
  999                 CHN_LOCK(volch);
 1000                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
 1001                         CHN_UNLOCK(volch);
 1002                         return (-1);
 1003                 }
 1004                 if (volch->direction == PCMDIR_PLAY)
 1005                         wrch = volch;
 1006                 else
 1007                         rdch = volch;
 1008         }
 1009 
 1010         ret = EINVAL;
 1011 
 1012         if (volch != NULL &&
 1013             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
 1014             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
 1015                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
 1016                         int left, right, center;
 1017 
 1018                         left = *(int *)arg & 0x7f;
 1019                         right = ((*(int *)arg) >> 8) & 0x7f;
 1020                         center = (left + right) >> 1;
 1021                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
 1022                             center);
 1023                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
 1024                         *(int *)arg = CHN_GETVOLUME(volch,
 1025                                 SND_VOL_C_PCM, SND_CHN_T_FL);
 1026                         *(int *)arg |= CHN_GETVOLUME(volch,
 1027                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
 1028                 }
 1029                 ret = 0;
 1030         } else if (rdch != NULL || wrch != NULL) {
 1031                 switch (j) {
 1032                 case SOUND_MIXER_DEVMASK:
 1033                 case SOUND_MIXER_CAPS:
 1034                 case SOUND_MIXER_STEREODEVS:
 1035                         if ((cmd & ~0xff) == MIXER_READ(0)) {
 1036                                 *(int *)arg = 0;
 1037                                 if (rdch != NULL)
 1038                                         *(int *)arg |= SOUND_MASK_RECLEV;
 1039                                 if (wrch != NULL)
 1040                                         *(int *)arg |= SOUND_MASK_PCM;
 1041                         }
 1042                         ret = 0;
 1043                         break;
 1044                 case SOUND_MIXER_RECMASK:
 1045                 case SOUND_MIXER_RECSRC:
 1046                         if ((cmd & ~0xff) == MIXER_READ(0))
 1047                                 *(int *)arg = 0;
 1048                         ret = 0;
 1049                         break;
 1050                 default:
 1051                         break;
 1052                 }
 1053         }
 1054 
 1055         if (volch != NULL)
 1056                 CHN_UNLOCK(volch);
 1057 
 1058         return (ret);
 1059 }
 1060 
 1061 static int
 1062 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
 1063     struct thread *td)
 1064 {
 1065         struct pcm_channel *chn, *rdch, *wrch;
 1066         struct snddev_info *d;
 1067         u_long xcmd;
 1068         int *arg_i, ret, tmp;
 1069 
 1070         d = dsp_get_info(i_dev);
 1071         if (!DSP_REGISTERED(d, i_dev))
 1072                 return (EBADF);
 1073 
 1074         PCM_GIANT_ENTER(d);
 1075 
 1076         arg_i = (int *)arg;
 1077         ret = 0;
 1078         xcmd = 0;
 1079         chn = NULL;
 1080 
 1081         if (IOCGROUP(cmd) == 'M') {
 1082                 if (cmd == OSS_GETVERSION) {
 1083                         *arg_i = SOUND_VERSION;
 1084                         PCM_GIANT_EXIT(d);
 1085                         return (0);
 1086                 }
 1087                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
 1088                 if (ret != -1) {
 1089                         PCM_GIANT_EXIT(d);
 1090                         return (ret);
 1091                 }
 1092 
 1093                 if (d->mixer_dev != NULL) {
 1094                         PCM_ACQUIRE_QUICK(d);
 1095                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1096                             MIXER_CMD_DIRECT);
 1097                         PCM_RELEASE_QUICK(d);
 1098                 } else
 1099                         ret = EBADF;
 1100 
 1101                 PCM_GIANT_EXIT(d);
 1102 
 1103                 return (ret);
 1104         }
 1105 
 1106         /*
 1107          * Certain ioctls may be made on any type of device (audio, mixer,
 1108          * and MIDI).  Handle those special cases here.
 1109          */
 1110         if (IOCGROUP(cmd) == 'X') {
 1111                 PCM_ACQUIRE_QUICK(d);
 1112                 switch(cmd) {
 1113                 case SNDCTL_SYSINFO:
 1114                         sound_oss_sysinfo((oss_sysinfo *)arg);
 1115                         break;
 1116                 case SNDCTL_CARDINFO:
 1117                         ret = sound_oss_card_info((oss_card_info *)arg);
 1118                         break;
 1119                 case SNDCTL_AUDIOINFO:
 1120                 case SNDCTL_AUDIOINFO_EX:
 1121                 case SNDCTL_ENGINEINFO:
 1122                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
 1123                         break;
 1124                 case SNDCTL_MIXERINFO:
 1125                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
 1126                         break;
 1127                 default:
 1128                         ret = EINVAL;
 1129                 }
 1130                 PCM_RELEASE_QUICK(d);
 1131                 PCM_GIANT_EXIT(d);
 1132                 return (ret);
 1133         }
 1134 
 1135         getchns(i_dev, &rdch, &wrch, 0);
 1136 
 1137         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
 1138                 wrch = NULL;
 1139         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
 1140                 rdch = NULL;
 1141 
 1142         if (wrch == NULL && rdch == NULL) {
 1143                 PCM_GIANT_EXIT(d);
 1144                 return (EINVAL);
 1145         }
 1146 
 1147         switch(cmd) {
 1148 #ifdef OLDPCM_IOCTL
 1149         /*
 1150          * we start with the new ioctl interface.
 1151          */
 1152         case AIONWRITE: /* how many bytes can write ? */
 1153                 if (wrch) {
 1154                         CHN_LOCK(wrch);
 1155 /*
 1156                 if (wrch && wrch->bufhard.dl)
 1157                         while (chn_wrfeed(wrch) == 0);
 1158 */
 1159                         *arg_i = sndbuf_getfree(wrch->bufsoft);
 1160                         CHN_UNLOCK(wrch);
 1161                 } else {
 1162                         *arg_i = 0;
 1163                         ret = EINVAL;
 1164                 }
 1165                 break;
 1166 
 1167         case AIOSSIZE:     /* set the current blocksize */
 1168                 {
 1169                         struct snd_size *p = (struct snd_size *)arg;
 1170 
 1171                         p->play_size = 0;
 1172                         p->rec_size = 0;
 1173                         PCM_ACQUIRE_QUICK(d);
 1174                         if (wrch) {
 1175                                 CHN_LOCK(wrch);
 1176                                 chn_setblocksize(wrch, 2, p->play_size);
 1177                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1178                                 CHN_UNLOCK(wrch);
 1179                         }
 1180                         if (rdch) {
 1181                                 CHN_LOCK(rdch);
 1182                                 chn_setblocksize(rdch, 2, p->rec_size);
 1183                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1184                                 CHN_UNLOCK(rdch);
 1185                         }
 1186                         PCM_RELEASE_QUICK(d);
 1187                 }
 1188                 break;
 1189         case AIOGSIZE:  /* get the current blocksize */
 1190                 {
 1191                         struct snd_size *p = (struct snd_size *)arg;
 1192 
 1193                         if (wrch) {
 1194                                 CHN_LOCK(wrch);
 1195                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1196                                 CHN_UNLOCK(wrch);
 1197                         }
 1198                         if (rdch) {
 1199                                 CHN_LOCK(rdch);
 1200                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1201                                 CHN_UNLOCK(rdch);
 1202                         }
 1203                 }
 1204                 break;
 1205 
 1206         case AIOSFMT:
 1207         case AIOGFMT:
 1208                 {
 1209                         snd_chan_param *p = (snd_chan_param *)arg;
 1210 
 1211                         if (cmd == AIOSFMT &&
 1212                             ((p->play_format != 0 && p->play_rate == 0) ||
 1213                             (p->rec_format != 0 && p->rec_rate == 0))) {
 1214                                 ret = EINVAL;
 1215                                 break;
 1216                         }
 1217                         PCM_ACQUIRE_QUICK(d);
 1218                         if (wrch) {
 1219                                 CHN_LOCK(wrch);
 1220                                 if (cmd == AIOSFMT && p->play_format != 0) {
 1221                                         chn_setformat(wrch,
 1222                                             SND_FORMAT(p->play_format,
 1223                                             AFMT_CHANNEL(wrch->format),
 1224                                             AFMT_EXTCHANNEL(wrch->format)));
 1225                                         chn_setspeed(wrch, p->play_rate);
 1226                                 }
 1227                                 p->play_rate = wrch->speed;
 1228                                 p->play_format = AFMT_ENCODING(wrch->format);
 1229                                 CHN_UNLOCK(wrch);
 1230                         } else {
 1231                                 p->play_rate = 0;
 1232                                 p->play_format = 0;
 1233                         }
 1234                         if (rdch) {
 1235                                 CHN_LOCK(rdch);
 1236                                 if (cmd == AIOSFMT && p->rec_format != 0) {
 1237                                         chn_setformat(rdch,
 1238                                             SND_FORMAT(p->rec_format,
 1239                                             AFMT_CHANNEL(rdch->format),
 1240                                             AFMT_EXTCHANNEL(rdch->format)));
 1241                                         chn_setspeed(rdch, p->rec_rate);
 1242                                 }
 1243                                 p->rec_rate = rdch->speed;
 1244                                 p->rec_format = AFMT_ENCODING(rdch->format);
 1245                                 CHN_UNLOCK(rdch);
 1246                         } else {
 1247                                 p->rec_rate = 0;
 1248                                 p->rec_format = 0;
 1249                         }
 1250                         PCM_RELEASE_QUICK(d);
 1251                 }
 1252                 break;
 1253 
 1254         case AIOGCAP:     /* get capabilities */
 1255                 {
 1256                         snd_capabilities *p = (snd_capabilities *)arg;
 1257                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
 1258                         struct cdev *pdev;
 1259 
 1260                         PCM_LOCK(d);
 1261                         if (rdch) {
 1262                                 CHN_LOCK(rdch);
 1263                                 rcaps = chn_getcaps(rdch);
 1264                         }
 1265                         if (wrch) {
 1266                                 CHN_LOCK(wrch);
 1267                                 pcaps = chn_getcaps(wrch);
 1268                         }
 1269                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
 1270                                           pcaps? pcaps->minspeed : 0);
 1271                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
 1272                                           pcaps? pcaps->maxspeed : 1000000);
 1273                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
 1274                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
 1275                         /* XXX bad on sb16 */
 1276                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
 1277                                      (wrch? chn_getformats(wrch) : 0xffffffff);
 1278                         if (rdch && wrch)
 1279                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
 1280                         pdev = d->mixer_dev;
 1281                         p->mixers = 1; /* default: one mixer */
 1282                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
 1283                         p->left = p->right = 100;
 1284                         if (wrch)
 1285                                 CHN_UNLOCK(wrch);
 1286                         if (rdch)
 1287                                 CHN_UNLOCK(rdch);
 1288                         PCM_UNLOCK(d);
 1289                 }
 1290                 break;
 1291 
 1292         case AIOSTOP:
 1293                 if (*arg_i == AIOSYNC_PLAY && wrch) {
 1294                         CHN_LOCK(wrch);
 1295                         *arg_i = chn_abort(wrch);
 1296                         CHN_UNLOCK(wrch);
 1297                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
 1298                         CHN_LOCK(rdch);
 1299                         *arg_i = chn_abort(rdch);
 1300                         CHN_UNLOCK(rdch);
 1301                 } else {
 1302                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 1303                         *arg_i = 0;
 1304                 }
 1305                 break;
 1306 
 1307         case AIOSYNC:
 1308                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
 1309                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
 1310                 break;
 1311 #endif
 1312         /*
 1313          * here follow the standard ioctls (filio.h etc.)
 1314          */
 1315         case FIONREAD: /* get # bytes to read */
 1316                 if (rdch) {
 1317                         CHN_LOCK(rdch);
 1318 /*                      if (rdch && rdch->bufhard.dl)
 1319                                 while (chn_rdfeed(rdch) == 0);
 1320 */
 1321                         *arg_i = sndbuf_getready(rdch->bufsoft);
 1322                         CHN_UNLOCK(rdch);
 1323                 } else {
 1324                         *arg_i = 0;
 1325                         ret = EINVAL;
 1326                 }
 1327                 break;
 1328 
 1329         case FIOASYNC: /*set/clear async i/o */
 1330                 DEB( printf("FIOASYNC\n") ; )
 1331                 break;
 1332 
 1333         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
 1334         case FIONBIO: /* set/clear non-blocking i/o */
 1335                 if (rdch) {
 1336                         CHN_LOCK(rdch);
 1337                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1338                                 rdch->flags |= CHN_F_NBIO;
 1339                         else
 1340                                 rdch->flags &= ~CHN_F_NBIO;
 1341                         CHN_UNLOCK(rdch);
 1342                 }
 1343                 if (wrch) {
 1344                         CHN_LOCK(wrch);
 1345                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1346                                 wrch->flags |= CHN_F_NBIO;
 1347                         else
 1348                                 wrch->flags &= ~CHN_F_NBIO;
 1349                         CHN_UNLOCK(wrch);
 1350                 }
 1351                 break;
 1352 
 1353         /*
 1354          * Finally, here is the linux-compatible ioctl interface
 1355          */
 1356 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
 1357         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
 1358         case SNDCTL_DSP_GETBLKSIZE:
 1359                 chn = wrch ? wrch : rdch;
 1360                 if (chn) {
 1361                         CHN_LOCK(chn);
 1362                         *arg_i = sndbuf_getblksz(chn->bufsoft);
 1363                         CHN_UNLOCK(chn);
 1364                 } else {
 1365                         *arg_i = 0;
 1366                         ret = EINVAL;
 1367                 }
 1368                 break;
 1369 
 1370         case SNDCTL_DSP_SETBLKSIZE:
 1371                 RANGE(*arg_i, 16, 65536);
 1372                 PCM_ACQUIRE_QUICK(d);
 1373                 if (wrch) {
 1374                         CHN_LOCK(wrch);
 1375                         chn_setblocksize(wrch, 2, *arg_i);
 1376                         CHN_UNLOCK(wrch);
 1377                 }
 1378                 if (rdch) {
 1379                         CHN_LOCK(rdch);
 1380                         chn_setblocksize(rdch, 2, *arg_i);
 1381                         CHN_UNLOCK(rdch);
 1382                 }
 1383                 PCM_RELEASE_QUICK(d);
 1384                 break;
 1385 
 1386         case SNDCTL_DSP_RESET:
 1387                 DEB(printf("dsp reset\n"));
 1388                 if (wrch) {
 1389                         CHN_LOCK(wrch);
 1390                         chn_abort(wrch);
 1391                         chn_resetbuf(wrch);
 1392                         CHN_UNLOCK(wrch);
 1393                 }
 1394                 if (rdch) {
 1395                         CHN_LOCK(rdch);
 1396                         chn_abort(rdch);
 1397                         chn_resetbuf(rdch);
 1398                         CHN_UNLOCK(rdch);
 1399                 }
 1400                 break;
 1401 
 1402         case SNDCTL_DSP_SYNC:
 1403                 DEB(printf("dsp sync\n"));
 1404                 /* chn_sync may sleep */
 1405                 if (wrch) {
 1406                         CHN_LOCK(wrch);
 1407                         chn_sync(wrch, 0);
 1408                         CHN_UNLOCK(wrch);
 1409                 }
 1410                 break;
 1411 
 1412         case SNDCTL_DSP_SPEED:
 1413                 /* chn_setspeed may sleep */
 1414                 tmp = 0;
 1415                 PCM_ACQUIRE_QUICK(d);
 1416                 if (wrch) {
 1417                         CHN_LOCK(wrch);
 1418                         ret = chn_setspeed(wrch, *arg_i);
 1419                         tmp = wrch->speed;
 1420                         CHN_UNLOCK(wrch);
 1421                 }
 1422                 if (rdch && ret == 0) {
 1423                         CHN_LOCK(rdch);
 1424                         ret = chn_setspeed(rdch, *arg_i);
 1425                         if (tmp == 0)
 1426                                 tmp = rdch->speed;
 1427                         CHN_UNLOCK(rdch);
 1428                 }
 1429                 PCM_RELEASE_QUICK(d);
 1430                 *arg_i = tmp;
 1431                 break;
 1432 
 1433         case SOUND_PCM_READ_RATE:
 1434                 chn = wrch ? wrch : rdch;
 1435                 if (chn) {
 1436                         CHN_LOCK(chn);
 1437                         *arg_i = chn->speed;
 1438                         CHN_UNLOCK(chn);
 1439                 } else {
 1440                         *arg_i = 0;
 1441                         ret = EINVAL;
 1442                 }
 1443                 break;
 1444 
 1445         case SNDCTL_DSP_STEREO:
 1446                 tmp = -1;
 1447                 *arg_i = (*arg_i)? 2 : 1;
 1448                 PCM_ACQUIRE_QUICK(d);
 1449                 if (wrch) {
 1450                         CHN_LOCK(wrch);
 1451                         ret = chn_setformat(wrch,
 1452                             SND_FORMAT(wrch->format, *arg_i, 0));
 1453                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
 1454                         CHN_UNLOCK(wrch);
 1455                 }
 1456                 if (rdch && ret == 0) {
 1457                         CHN_LOCK(rdch);
 1458                         ret = chn_setformat(rdch,
 1459                             SND_FORMAT(rdch->format, *arg_i, 0));
 1460                         if (tmp == -1)
 1461                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
 1462                         CHN_UNLOCK(rdch);
 1463                 }
 1464                 PCM_RELEASE_QUICK(d);
 1465                 *arg_i = tmp;
 1466                 break;
 1467 
 1468         case SOUND_PCM_WRITE_CHANNELS:
 1469 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
 1470                 if (*arg_i < 0) {
 1471                         *arg_i = 0;
 1472                         ret = EINVAL;
 1473                         break;
 1474                 }
 1475                 if (*arg_i != 0) {
 1476                         struct pcmchan_matrix *m;
 1477                         uint32_t ext;
 1478 
 1479                         tmp = 0;
 1480                         if (*arg_i > SND_CHN_MAX)
 1481                                 *arg_i = SND_CHN_MAX;
 1482 
 1483                         m = feeder_matrix_default_channel_map(*arg_i);
 1484                         if (m != NULL)
 1485                                 ext = m->ext;
 1486                         else
 1487                                 ext = 0;
 1488 
 1489                         PCM_ACQUIRE_QUICK(d);
 1490                         if (wrch) {
 1491                                 CHN_LOCK(wrch);
 1492                                 ret = chn_setformat(wrch,
 1493                                     SND_FORMAT(wrch->format, *arg_i, ext));
 1494                                 tmp = AFMT_CHANNEL(wrch->format);
 1495                                 CHN_UNLOCK(wrch);
 1496                         }
 1497                         if (rdch && ret == 0) {
 1498                                 CHN_LOCK(rdch);
 1499                                 ret = chn_setformat(rdch,
 1500                                     SND_FORMAT(rdch->format, *arg_i, ext));
 1501                                 if (tmp == 0)
 1502                                         tmp = AFMT_CHANNEL(rdch->format);
 1503                                 CHN_UNLOCK(rdch);
 1504                         }
 1505                         PCM_RELEASE_QUICK(d);
 1506                         *arg_i = tmp;
 1507                 } else {
 1508                         chn = wrch ? wrch : rdch;
 1509                         CHN_LOCK(chn);
 1510                         *arg_i = AFMT_CHANNEL(chn->format);
 1511                         CHN_UNLOCK(chn);
 1512                 }
 1513                 break;
 1514 
 1515         case SOUND_PCM_READ_CHANNELS:
 1516                 chn = wrch ? wrch : rdch;
 1517                 if (chn) {
 1518                         CHN_LOCK(chn);
 1519                         *arg_i = AFMT_CHANNEL(chn->format);
 1520                         CHN_UNLOCK(chn);
 1521                 } else {
 1522                         *arg_i = 0;
 1523                         ret = EINVAL;
 1524                 }
 1525                 break;
 1526 
 1527         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
 1528                 chn = wrch ? wrch : rdch;
 1529                 if (chn) {
 1530                         CHN_LOCK(chn);
 1531                         *arg_i = chn_getformats(chn);
 1532                         CHN_UNLOCK(chn);
 1533                 } else {
 1534                         *arg_i = 0;
 1535                         ret = EINVAL;
 1536                 }
 1537                 break;
 1538 
 1539         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
 1540                 if (*arg_i != AFMT_QUERY) {
 1541                         tmp = 0;
 1542                         PCM_ACQUIRE_QUICK(d);
 1543                         if (wrch) {
 1544                                 CHN_LOCK(wrch);
 1545                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
 1546                                     AFMT_CHANNEL(wrch->format),
 1547                                     AFMT_EXTCHANNEL(wrch->format)));
 1548                                 tmp = wrch->format;
 1549                                 CHN_UNLOCK(wrch);
 1550                         }
 1551                         if (rdch && ret == 0) {
 1552                                 CHN_LOCK(rdch);
 1553                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
 1554                                     AFMT_CHANNEL(rdch->format),
 1555                                     AFMT_EXTCHANNEL(rdch->format)));
 1556                                 if (tmp == 0)
 1557                                         tmp = rdch->format;
 1558                                 CHN_UNLOCK(rdch);
 1559                         }
 1560                         PCM_RELEASE_QUICK(d);
 1561                         *arg_i = AFMT_ENCODING(tmp);
 1562                 } else {
 1563                         chn = wrch ? wrch : rdch;
 1564                         CHN_LOCK(chn);
 1565                         *arg_i = AFMT_ENCODING(chn->format);
 1566                         CHN_UNLOCK(chn);
 1567                 }
 1568                 break;
 1569 
 1570         case SNDCTL_DSP_SETFRAGMENT:
 1571                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
 1572                 {
 1573                         uint32_t fragln = (*arg_i) & 0x0000ffff;
 1574                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
 1575                         uint32_t fragsz;
 1576                         uint32_t r_maxfrags, r_fragsz;
 1577 
 1578                         RANGE(fragln, 4, 16);
 1579                         fragsz = 1 << fragln;
 1580 
 1581                         if (maxfrags == 0)
 1582                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1583                         if (maxfrags < 2)
 1584                                 maxfrags = 2;
 1585                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
 1586                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1587 
 1588                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
 1589                         PCM_ACQUIRE_QUICK(d);
 1590                         if (rdch) {
 1591                                 CHN_LOCK(rdch);
 1592                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
 1593                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
 1594                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
 1595                                 CHN_UNLOCK(rdch);
 1596                         } else {
 1597                                 r_maxfrags = maxfrags;
 1598                                 r_fragsz = fragsz;
 1599                         }
 1600                         if (wrch && ret == 0) {
 1601                                 CHN_LOCK(wrch);
 1602                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
 1603                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
 1604                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
 1605                                 CHN_UNLOCK(wrch);
 1606                         } else { /* use whatever came from the read channel */
 1607                                 maxfrags = r_maxfrags;
 1608                                 fragsz = r_fragsz;
 1609                         }
 1610                         PCM_RELEASE_QUICK(d);
 1611 
 1612                         fragln = 0;
 1613                         while (fragsz > 1) {
 1614                                 fragln++;
 1615                                 fragsz >>= 1;
 1616                         }
 1617                         *arg_i = (maxfrags << 16) | fragln;
 1618                 }
 1619                 break;
 1620 
 1621         case SNDCTL_DSP_GETISPACE:
 1622                 /* return the size of data available in the input queue */
 1623                 {
 1624                         audio_buf_info *a = (audio_buf_info *)arg;
 1625                         if (rdch) {
 1626                                 struct snd_dbuf *bs = rdch->bufsoft;
 1627 
 1628                                 CHN_LOCK(rdch);
 1629                                 a->bytes = sndbuf_getready(bs);
 1630                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1631                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1632                                 a->fragsize = sndbuf_getblksz(bs);
 1633                                 CHN_UNLOCK(rdch);
 1634                         } else
 1635                                 ret = EINVAL;
 1636                 }
 1637                 break;
 1638 
 1639         case SNDCTL_DSP_GETOSPACE:
 1640                 /* return space available in the output queue */
 1641                 {
 1642                         audio_buf_info *a = (audio_buf_info *)arg;
 1643                         if (wrch) {
 1644                                 struct snd_dbuf *bs = wrch->bufsoft;
 1645 
 1646                                 CHN_LOCK(wrch);
 1647                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1648                                 a->bytes = sndbuf_getfree(bs);
 1649                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1650                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1651                                 a->fragsize = sndbuf_getblksz(bs);
 1652                                 CHN_UNLOCK(wrch);
 1653                         } else
 1654                                 ret = EINVAL;
 1655                 }
 1656                 break;
 1657 
 1658         case SNDCTL_DSP_GETIPTR:
 1659                 {
 1660                         count_info *a = (count_info *)arg;
 1661                         if (rdch) {
 1662                                 struct snd_dbuf *bs = rdch->bufsoft;
 1663 
 1664                                 CHN_LOCK(rdch);
 1665                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
 1666                                 a->bytes = sndbuf_gettotal(bs);
 1667                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
 1668                                 a->ptr = sndbuf_getfreeptr(bs);
 1669                                 rdch->blocks = sndbuf_getblocks(bs);
 1670                                 CHN_UNLOCK(rdch);
 1671                         } else
 1672                                 ret = EINVAL;
 1673                 }
 1674                 break;
 1675 
 1676         case SNDCTL_DSP_GETOPTR:
 1677                 {
 1678                         count_info *a = (count_info *)arg;
 1679                         if (wrch) {
 1680                                 struct snd_dbuf *bs = wrch->bufsoft;
 1681 
 1682                                 CHN_LOCK(wrch);
 1683                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1684                                 a->bytes = sndbuf_gettotal(bs);
 1685                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
 1686                                 a->ptr = sndbuf_getreadyptr(bs);
 1687                                 wrch->blocks = sndbuf_getblocks(bs);
 1688                                 CHN_UNLOCK(wrch);
 1689                         } else
 1690                                 ret = EINVAL;
 1691                 }
 1692                 break;
 1693 
 1694         case SNDCTL_DSP_GETCAPS:
 1695                 PCM_LOCK(d);
 1696                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
 1697                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1698                         *arg_i |= PCM_CAP_DUPLEX;
 1699                 PCM_UNLOCK(d);
 1700                 break;
 1701 
 1702         case SOUND_PCM_READ_BITS:
 1703                 chn = wrch ? wrch : rdch;
 1704                 if (chn) {
 1705                         CHN_LOCK(chn);
 1706                         if (chn->format & AFMT_8BIT)
 1707                                 *arg_i = 8;
 1708                         else if (chn->format & AFMT_16BIT)
 1709                                 *arg_i = 16;
 1710                         else if (chn->format & AFMT_24BIT)
 1711                                 *arg_i = 24;
 1712                         else if (chn->format & AFMT_32BIT)
 1713                                 *arg_i = 32;
 1714                         else
 1715                                 ret = EINVAL;
 1716                         CHN_UNLOCK(chn);
 1717                 } else {
 1718                         *arg_i = 0;
 1719                         ret = EINVAL;
 1720                 }
 1721                 break;
 1722 
 1723         case SNDCTL_DSP_SETTRIGGER:
 1724                 if (rdch) {
 1725                         CHN_LOCK(rdch);
 1726                         rdch->flags &= ~CHN_F_NOTRIGGER;
 1727                         if (*arg_i & PCM_ENABLE_INPUT)
 1728                                 chn_start(rdch, 1);
 1729                         else {
 1730                                 chn_abort(rdch);
 1731                                 chn_resetbuf(rdch);
 1732                                 rdch->flags |= CHN_F_NOTRIGGER;
 1733                         }
 1734                         CHN_UNLOCK(rdch);
 1735                 }
 1736                 if (wrch) {
 1737                         CHN_LOCK(wrch);
 1738                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1739                         if (*arg_i & PCM_ENABLE_OUTPUT)
 1740                                 chn_start(wrch, 1);
 1741                         else {
 1742                                 chn_abort(wrch);
 1743                                 chn_resetbuf(wrch);
 1744                                 wrch->flags |= CHN_F_NOTRIGGER;
 1745                         }
 1746                         CHN_UNLOCK(wrch);
 1747                 }
 1748                 break;
 1749 
 1750         case SNDCTL_DSP_GETTRIGGER:
 1751                 *arg_i = 0;
 1752                 if (wrch) {
 1753                         CHN_LOCK(wrch);
 1754                         if (wrch->flags & CHN_F_TRIGGERED)
 1755                                 *arg_i |= PCM_ENABLE_OUTPUT;
 1756                         CHN_UNLOCK(wrch);
 1757                 }
 1758                 if (rdch) {
 1759                         CHN_LOCK(rdch);
 1760                         if (rdch->flags & CHN_F_TRIGGERED)
 1761                                 *arg_i |= PCM_ENABLE_INPUT;
 1762                         CHN_UNLOCK(rdch);
 1763                 }
 1764                 break;
 1765 
 1766         case SNDCTL_DSP_GETODELAY:
 1767                 if (wrch) {
 1768                         struct snd_dbuf *bs = wrch->bufsoft;
 1769 
 1770                         CHN_LOCK(wrch);
 1771                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1772                         *arg_i = sndbuf_getready(bs);
 1773                         CHN_UNLOCK(wrch);
 1774                 } else
 1775                         ret = EINVAL;
 1776                 break;
 1777 
 1778         case SNDCTL_DSP_POST:
 1779                 if (wrch) {
 1780                         CHN_LOCK(wrch);
 1781                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1782                         chn_start(wrch, 1);
 1783                         CHN_UNLOCK(wrch);
 1784                 }
 1785                 break;
 1786 
 1787         case SNDCTL_DSP_SETDUPLEX:
 1788                 /*
 1789                  * switch to full-duplex mode if card is in half-duplex
 1790                  * mode and is able to work in full-duplex mode
 1791                  */
 1792                 PCM_LOCK(d);
 1793                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1794                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
 1795                 PCM_UNLOCK(d);
 1796                 break;
 1797 
 1798         /*
 1799          * The following four ioctls are simple wrappers around mixer_ioctl
 1800          * with no further processing.  xcmd is short for "translated
 1801          * command".
 1802          */
 1803         case SNDCTL_DSP_GETRECVOL:
 1804                 if (xcmd == 0) {
 1805                         xcmd = SOUND_MIXER_READ_RECLEV;
 1806                         chn = rdch;
 1807                 }
 1808                 /* FALLTHROUGH */
 1809         case SNDCTL_DSP_SETRECVOL:
 1810                 if (xcmd == 0) {
 1811                         xcmd = SOUND_MIXER_WRITE_RECLEV;
 1812                         chn = rdch;
 1813                 }
 1814                 /* FALLTHROUGH */
 1815         case SNDCTL_DSP_GETPLAYVOL:
 1816                 if (xcmd == 0) {
 1817                         xcmd = SOUND_MIXER_READ_PCM;
 1818                         chn = wrch;
 1819                 }
 1820                 /* FALLTHROUGH */
 1821         case SNDCTL_DSP_SETPLAYVOL:
 1822                 if (xcmd == 0) {
 1823                         xcmd = SOUND_MIXER_WRITE_PCM;
 1824                         chn = wrch;
 1825                 }
 1826 
 1827                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
 1828                 if (ret != -1) {
 1829                         PCM_GIANT_EXIT(d);
 1830                         return (ret);
 1831                 }
 1832 
 1833                 if (d->mixer_dev != NULL) {
 1834                         PCM_ACQUIRE_QUICK(d);
 1835                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
 1836                             MIXER_CMD_DIRECT);
 1837                         PCM_RELEASE_QUICK(d);
 1838                 } else
 1839                         ret = ENOTSUP;
 1840 
 1841                 break;
 1842 
 1843         case SNDCTL_DSP_GET_RECSRC_NAMES:
 1844         case SNDCTL_DSP_GET_RECSRC:
 1845         case SNDCTL_DSP_SET_RECSRC:
 1846                 if (d->mixer_dev != NULL) {
 1847                         PCM_ACQUIRE_QUICK(d);
 1848                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1849                             MIXER_CMD_DIRECT);
 1850                         PCM_RELEASE_QUICK(d);
 1851                 } else
 1852                         ret = ENOTSUP;
 1853                 break;
 1854 
 1855         /*
 1856          * The following 3 ioctls aren't very useful at the moment.  For
 1857          * now, only a single channel is associated with a cdev (/dev/dspN
 1858          * instance), so there's only a single output routing to use (i.e.,
 1859          * the wrch bound to this cdev).
 1860          */
 1861         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
 1862                 {
 1863                         oss_mixer_enuminfo *ei;
 1864                         ei = (oss_mixer_enuminfo *)arg;
 1865                         ei->dev = 0;
 1866                         ei->ctrl = 0;
 1867                         ei->version = 0; /* static for now */
 1868                         ei->strindex[0] = 0;
 1869 
 1870                         if (wrch != NULL) {
 1871                                 ei->nvalues = 1;
 1872                                 strlcpy(ei->strings, wrch->name,
 1873                                         sizeof(ei->strings));
 1874                         } else {
 1875                                 ei->nvalues = 0;
 1876                                 ei->strings[0] = '\0';
 1877                         }
 1878                 }
 1879                 break;
 1880         case SNDCTL_DSP_GET_PLAYTGT:
 1881         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
 1882                 /*
 1883                  * Re: SET_PLAYTGT
 1884                  *   OSSv4: "The value that was accepted by the device will
 1885                  *   be returned back in the variable pointed by the
 1886                  *   argument."
 1887                  */
 1888                 if (wrch != NULL)
 1889                         *arg_i = 0;
 1890                 else
 1891                         ret = EINVAL;
 1892                 break;
 1893 
 1894         case SNDCTL_DSP_SILENCE:
 1895         /*
 1896          * Flush the software (pre-feed) buffer, but try to minimize playback
 1897          * interruption.  (I.e., record unplayed samples with intent to
 1898          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
 1899          * functionality.
 1900          */
 1901                 if (wrch == NULL)
 1902                         ret = EINVAL;
 1903                 else {
 1904                         struct snd_dbuf *bs;
 1905                         CHN_LOCK(wrch);
 1906                         while (wrch->inprog != 0)
 1907                                 cv_wait(&wrch->cv, wrch->lock);
 1908                         bs = wrch->bufsoft;
 1909                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
 1910                                 bs->sl = sndbuf_getready(bs);
 1911                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
 1912                                 sndbuf_fillsilence(bs);
 1913                                 chn_start(wrch, 0);
 1914                         }
 1915                         CHN_UNLOCK(wrch);
 1916                 }
 1917                 break;
 1918 
 1919         case SNDCTL_DSP_SKIP:
 1920         /*
 1921          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
 1922          * playback buffer by moving the current write position immediately
 1923          * before the point where the device is currently reading the samples."
 1924          */
 1925                 if (wrch == NULL)
 1926                         ret = EINVAL;
 1927                 else {
 1928                         struct snd_dbuf *bs;
 1929                         CHN_LOCK(wrch);
 1930                         while (wrch->inprog != 0)
 1931                                 cv_wait(&wrch->cv, wrch->lock);
 1932                         bs = wrch->bufsoft;
 1933                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
 1934                                 sndbuf_softreset(bs);
 1935                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
 1936                                 bs->sl = 0;
 1937                                 chn_start(wrch, 0);
 1938                         }
 1939                         CHN_UNLOCK(wrch);
 1940                 }
 1941                 break;
 1942 
 1943         case SNDCTL_DSP_CURRENT_OPTR:
 1944         case SNDCTL_DSP_CURRENT_IPTR:
 1945         /**
 1946          * @note Changing formats resets the buffer counters, which differs
 1947          *       from the 4Front drivers.  However, I don't expect this to be
 1948          *       much of a problem.
 1949          *
 1950          * @note In a test where @c CURRENT_OPTR is called immediately after write
 1951          *       returns, this driver is about 32K samples behind whereas
 1952          *       4Front's is about 8K samples behind.  Should determine source
 1953          *       of discrepancy, even if only out of curiosity.
 1954          *
 1955          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
 1956          */
 1957                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
 1958                 if (chn == NULL) 
 1959                         ret = EINVAL;
 1960                 else {
 1961                         struct snd_dbuf *bs;
 1962                         /* int tmp; */
 1963 
 1964                         oss_count_t *oc = (oss_count_t *)arg;
 1965 
 1966                         CHN_LOCK(chn);
 1967                         bs = chn->bufsoft;
 1968 #if 0
 1969                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
 1970                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
 1971                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
 1972 #else
 1973                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
 1974                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
 1975 #endif
 1976                         CHN_UNLOCK(chn);
 1977                 }
 1978                 break;
 1979 
 1980         case SNDCTL_DSP_HALT_OUTPUT:
 1981         case SNDCTL_DSP_HALT_INPUT:
 1982                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
 1983                 if (chn == NULL)
 1984                         ret = EINVAL;
 1985                 else {
 1986                         CHN_LOCK(chn);
 1987                         chn_abort(chn);
 1988                         CHN_UNLOCK(chn);
 1989                 }
 1990                 break;
 1991 
 1992         case SNDCTL_DSP_LOW_WATER:
 1993         /*
 1994          * Set the number of bytes required to attract attention by
 1995          * select/poll.
 1996          */
 1997                 if (wrch != NULL) {
 1998                         CHN_LOCK(wrch);
 1999                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
 2000                         CHN_UNLOCK(wrch);
 2001                 }
 2002                 if (rdch != NULL) {
 2003                         CHN_LOCK(rdch);
 2004                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
 2005                         CHN_UNLOCK(rdch);
 2006                 }
 2007                 break;
 2008 
 2009         case SNDCTL_DSP_GETERROR:
 2010         /*
 2011          * OSSv4 docs:  "All errors and counters will automatically be
 2012          * cleared to zeroes after the call so each call will return only
 2013          * the errors that occurred after the previous invocation. ... The
 2014          * play_underruns and rec_overrun fields are the only useful fields
 2015          * returned by OSS 4.0."
 2016          */
 2017                 {
 2018                         audio_errinfo *ei = (audio_errinfo *)arg;
 2019 
 2020                         bzero((void *)ei, sizeof(*ei));
 2021 
 2022                         if (wrch != NULL) {
 2023                                 CHN_LOCK(wrch);
 2024                                 ei->play_underruns = wrch->xruns;
 2025                                 wrch->xruns = 0;
 2026                                 CHN_UNLOCK(wrch);
 2027                         }
 2028                         if (rdch != NULL) {
 2029                                 CHN_LOCK(rdch);
 2030                                 ei->rec_overruns = rdch->xruns;
 2031                                 rdch->xruns = 0;
 2032                                 CHN_UNLOCK(rdch);
 2033                         }
 2034                 }
 2035                 break;
 2036 
 2037         case SNDCTL_DSP_SYNCGROUP:
 2038                 PCM_ACQUIRE_QUICK(d);
 2039                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
 2040                 PCM_RELEASE_QUICK(d);
 2041                 break;
 2042 
 2043         case SNDCTL_DSP_SYNCSTART:
 2044                 PCM_ACQUIRE_QUICK(d);
 2045                 ret = dsp_oss_syncstart(*arg_i);
 2046                 PCM_RELEASE_QUICK(d);
 2047                 break;
 2048 
 2049         case SNDCTL_DSP_POLICY:
 2050                 PCM_ACQUIRE_QUICK(d);
 2051                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
 2052                 PCM_RELEASE_QUICK(d);
 2053                 break;
 2054 
 2055         case SNDCTL_DSP_COOKEDMODE:
 2056                 PCM_ACQUIRE_QUICK(d);
 2057                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
 2058                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
 2059                 PCM_RELEASE_QUICK(d);
 2060                 break;
 2061         case SNDCTL_DSP_GET_CHNORDER:
 2062                 PCM_ACQUIRE_QUICK(d);
 2063                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
 2064                 PCM_RELEASE_QUICK(d);
 2065                 break;
 2066         case SNDCTL_DSP_SET_CHNORDER:
 2067                 PCM_ACQUIRE_QUICK(d);
 2068                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
 2069                 PCM_RELEASE_QUICK(d);
 2070                 break;
 2071         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
 2072                 PCM_ACQUIRE_QUICK(d);
 2073                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
 2074                 PCM_RELEASE_QUICK(d);
 2075                 break;
 2076         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
 2077                 ret = EINVAL;
 2078                 break;
 2079 #ifdef  OSSV4_EXPERIMENT
 2080         /*
 2081          * XXX The following ioctls are not yet supported and just return
 2082          * EINVAL.
 2083          */
 2084         case SNDCTL_DSP_GETOPEAKS:
 2085         case SNDCTL_DSP_GETIPEAKS:
 2086                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
 2087                 if (chn == NULL)
 2088                         ret = EINVAL;
 2089                 else {
 2090                         oss_peaks_t *op = (oss_peaks_t *)arg;
 2091                         int lpeak, rpeak;
 2092 
 2093                         CHN_LOCK(chn);
 2094                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
 2095                         if (ret == -1)
 2096                                 ret = EINVAL;
 2097                         else {
 2098                                 (*op)[0] = lpeak;
 2099                                 (*op)[1] = rpeak;
 2100                         }
 2101                         CHN_UNLOCK(chn);
 2102                 }
 2103                 break;
 2104 
 2105         /*
 2106          * XXX Once implemented, revisit this for proper cv protection
 2107          *     (if necessary).
 2108          */
 2109         case SNDCTL_GETLABEL:
 2110                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
 2111                 break;
 2112         case SNDCTL_SETLABEL:
 2113                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
 2114                 break;
 2115         case SNDCTL_GETSONG:
 2116                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
 2117                 break;
 2118         case SNDCTL_SETSONG:
 2119                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
 2120                 break;
 2121         case SNDCTL_SETNAME:
 2122                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
 2123                 break;
 2124 #if 0
 2125         /**
 2126          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
 2127          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
 2128          * 4Front Technologies.
 2129          */
 2130         case SNDCTL_DSP_READCTL:
 2131         case SNDCTL_DSP_WRITECTL:
 2132                 ret = EINVAL;
 2133                 break;
 2134 #endif  /* !0 (explicitly omitted ioctls) */
 2135 
 2136 #endif  /* !OSSV4_EXPERIMENT */
 2137         case SNDCTL_DSP_MAPINBUF:
 2138         case SNDCTL_DSP_MAPOUTBUF:
 2139         case SNDCTL_DSP_SETSYNCRO:
 2140                 /* undocumented */
 2141 
 2142         case SNDCTL_DSP_SUBDIVIDE:
 2143         case SOUND_PCM_WRITE_FILTER:
 2144         case SOUND_PCM_READ_FILTER:
 2145                 /* dunno what these do, don't sound important */
 2146 
 2147         default:
 2148                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
 2149                 ret = EINVAL;
 2150                 break;
 2151         }
 2152 
 2153         PCM_GIANT_LEAVE(d);
 2154 
 2155         return (ret);
 2156 }
 2157 
 2158 static int
 2159 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
 2160 {
 2161         struct snddev_info *d;
 2162         struct pcm_channel *wrch, *rdch;
 2163         int ret, e;
 2164 
 2165         d = dsp_get_info(i_dev);
 2166         if (!DSP_REGISTERED(d, i_dev))
 2167                 return (EBADF);
 2168 
 2169         PCM_GIANT_ENTER(d);
 2170 
 2171         wrch = NULL;
 2172         rdch = NULL;
 2173         ret = 0;
 2174 
 2175         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2176 
 2177         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
 2178                 e = (events & (POLLOUT | POLLWRNORM));
 2179                 if (e)
 2180                         ret |= chn_poll(wrch, e, td);
 2181         }
 2182 
 2183         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
 2184                 e = (events & (POLLIN | POLLRDNORM));
 2185                 if (e)
 2186                         ret |= chn_poll(rdch, e, td);
 2187         }
 2188 
 2189         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2190 
 2191         PCM_GIANT_LEAVE(d);
 2192 
 2193         return (ret);
 2194 }
 2195 
 2196 static int
 2197 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
 2198     int nprot, vm_memattr_t *memattr)
 2199 {
 2200 
 2201         /* XXX memattr is not honored */
 2202         *paddr = vtophys(offset);
 2203         return (0);
 2204 }
 2205 
 2206 static int
 2207 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
 2208     vm_size_t size, struct vm_object **object, int nprot)
 2209 {
 2210         struct snddev_info *d;
 2211         struct pcm_channel *wrch, *rdch, *c;
 2212 
 2213         /*
 2214          * Reject PROT_EXEC by default. It just doesn't makes sense.
 2215          * Unfortunately, we have to give up this one due to linux_mmap
 2216          * changes.
 2217          *
 2218          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
 2219          *
 2220          */
 2221 #ifdef SV_ABI_LINUX
 2222         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
 2223             (dsp_mmap_allow_prot_exec == 0 &&
 2224             SV_CURPROC_ABI() != SV_ABI_LINUX)))
 2225 #else
 2226         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
 2227 #endif
 2228                 return (EINVAL);
 2229 
 2230         /*
 2231          * PROT_READ (alone) selects the input buffer.
 2232          * PROT_WRITE (alone) selects the output buffer.
 2233          * PROT_WRITE|PROT_READ together select the output buffer.
 2234          */
 2235         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
 2236                 return (EINVAL);
 2237 
 2238         d = dsp_get_info(i_dev);
 2239         if (!DSP_REGISTERED(d, i_dev))
 2240                 return (EINVAL);
 2241 
 2242         PCM_GIANT_ENTER(d);
 2243 
 2244         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2245 
 2246         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
 2247         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
 2248             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
 2249             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
 2250             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
 2251                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2252                 PCM_GIANT_EXIT(d);
 2253                 return (EINVAL);
 2254         }
 2255 
 2256         if (wrch != NULL)
 2257                 wrch->flags |= CHN_F_MMAP;
 2258         if (rdch != NULL)
 2259                 rdch->flags |= CHN_F_MMAP;
 2260 
 2261         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
 2262         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2263         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
 2264             size, nprot, *offset, curthread->td_ucred);
 2265 
 2266         PCM_GIANT_LEAVE(d);
 2267 
 2268         if (*object == NULL)
 2269                  return (EINVAL);
 2270         return (0);
 2271 }
 2272 
 2273 /* So much for dev_stdclone() */
 2274 static int
 2275 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
 2276 {
 2277         size_t len;
 2278 
 2279         len = strlen(namep);
 2280 
 2281         if (bcmp(name, namep, len) != 0)
 2282                 return (ENODEV);
 2283 
 2284         name += len;
 2285 
 2286         if (isdigit(*name) == 0)
 2287                 return (ENODEV);
 2288 
 2289         len = strlen(sep);
 2290 
 2291         if (*name == '' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
 2292                 return (ENODEV);
 2293 
 2294         for (*u = 0; isdigit(*name) != 0; name++) {
 2295                 *u *= 10;
 2296                 *u += *name - '';
 2297                 if (*u > dsp_umax)
 2298                         return (ENODEV);
 2299         }
 2300 
 2301         if (*name == '\0')
 2302                 return ((use_sep == 0) ? 0 : ENODEV);
 2303 
 2304         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
 2305                 return (ENODEV);
 2306 
 2307         name += len;
 2308 
 2309         if (*name == '' && name[1] != '\0')
 2310                 return (ENODEV);
 2311 
 2312         for (*c = 0; isdigit(*name) != 0; name++) {
 2313                 *c *= 10;
 2314                 *c += *name - '';
 2315                 if (*c > dsp_cmax)
 2316                         return (ENODEV);
 2317         }
 2318 
 2319         if (*name != '\0')
 2320                 return (ENODEV);
 2321 
 2322         return (0);
 2323 }
 2324 
 2325 static void
 2326 dsp_clone(void *arg,
 2327 #if __FreeBSD_version >= 600034
 2328     struct ucred *cred,
 2329 #endif
 2330     char *name, int namelen, struct cdev **dev)
 2331 {
 2332         struct snddev_info *d;
 2333         struct snd_clone_entry *ce;
 2334         struct pcm_channel *c;
 2335         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
 2336         char *devname, *devcmp, *devsep;
 2337 
 2338         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
 2339 
 2340         if (*dev != NULL)
 2341                 return;
 2342 
 2343         unit = -1;
 2344         cunit = -1;
 2345         devtype = -1;
 2346         devhw = 0;
 2347         devcmax = -1;
 2348         tumax = -1;
 2349         devname = NULL;
 2350         devsep = NULL;
 2351 
 2352         for (i = 0; unit == -1 &&
 2353             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2354                 devtype = dsp_cdevs[i].type;
 2355                 devcmp = dsp_cdevs[i].name;
 2356                 devsep = dsp_cdevs[i].sep;
 2357                 devname = dsp_cdevs[i].alias;
 2358                 if (devname == NULL)
 2359                         devname = devcmp;
 2360                 devhw = dsp_cdevs[i].hw;
 2361                 devcmax = dsp_cdevs[i].max - 1;
 2362                 if (strcmp(name, devcmp) == 0)
 2363                         unit = snd_unit;
 2364                 else if (dsp_stdclone(name, devcmp, devsep,
 2365                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
 2366                         unit = -1;
 2367                         cunit = -1;
 2368                 }
 2369         }
 2370 
 2371         d = devclass_get_softc(pcm_devclass, unit);
 2372         if (!PCM_REGISTERED(d) || d->clones == NULL)
 2373                 return;
 2374 
 2375         /* XXX Need Giant magic entry ??? */
 2376 
 2377         PCM_LOCK(d);
 2378         if (snd_clone_disabled(d->clones)) {
 2379                 PCM_UNLOCK(d);
 2380                 return;
 2381         }
 2382 
 2383         PCM_WAIT(d);
 2384         PCM_ACQUIRE(d);
 2385         PCM_UNLOCK(d);
 2386 
 2387         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
 2388 
 2389         if (devhw != 0) {
 2390                 KASSERT(devcmax <= dsp_cmax,
 2391                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
 2392                 if (cunit > devcmax) {
 2393                         PCM_RELEASE_QUICK(d);
 2394                         return;
 2395                 }
 2396                 udcmask |= snd_c2unit(cunit);
 2397                 CHN_FOREACH(c, d, channels.pcm) {
 2398                         CHN_LOCK(c);
 2399                         if (c->unit != udcmask) {
 2400                                 CHN_UNLOCK(c);
 2401                                 continue;
 2402                         }
 2403                         CHN_UNLOCK(c);
 2404                         udcmask &= ~snd_c2unit(cunit);
 2405                         /*
 2406                          * Temporarily increase clone maxunit to overcome
 2407                          * vchan flexibility.
 2408                          *
 2409                          * # sysctl dev.pcm.0.play.vchans=256
 2410                          * dev.pcm.0.play.vchans: 1 -> 256
 2411                          * # cat /dev/zero > /dev/dsp0.vp255 &
 2412                          * [1] 17296
 2413                          * # sysctl dev.pcm.0.play.vchans=0
 2414                          * dev.pcm.0.play.vchans: 256 -> 1
 2415                          * # fg
 2416                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
 2417                          * ^C
 2418                          * # cat /dev/zero > /dev/dsp0.vp255
 2419                          * zsh: operation not supported: /dev/dsp0.vp255
 2420                          */
 2421                         tumax = snd_clone_getmaxunit(d->clones);
 2422                         if (cunit > tumax)
 2423                                 snd_clone_setmaxunit(d->clones, cunit);
 2424                         else
 2425                                 tumax = -1;
 2426                         goto dsp_clone_alloc;
 2427                 }
 2428                 /*
 2429                  * Ok, so we're requesting unallocated vchan, but still
 2430                  * within maximum vchan limit.
 2431                  */
 2432                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
 2433                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
 2434                     cunit < snd_maxautovchans) {
 2435                         udcmask &= ~snd_c2unit(cunit);
 2436                         tumax = snd_clone_getmaxunit(d->clones);
 2437                         if (cunit > tumax)
 2438                                 snd_clone_setmaxunit(d->clones, cunit);
 2439                         else
 2440                                 tumax = -1;
 2441                         goto dsp_clone_alloc;
 2442                 }
 2443                 PCM_RELEASE_QUICK(d);
 2444                 return;
 2445         }
 2446 
 2447 dsp_clone_alloc:
 2448         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
 2449         if (tumax != -1)
 2450                 snd_clone_setmaxunit(d->clones, tumax);
 2451         if (ce != NULL) {
 2452                 udcmask |= snd_c2unit(cunit);
 2453                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
 2454                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
 2455                     devname, unit, devsep, cunit);
 2456                 snd_clone_register(ce, *dev);
 2457         }
 2458 
 2459         PCM_RELEASE_QUICK(d);
 2460 
 2461         if (*dev != NULL)
 2462                 dev_ref(*dev);
 2463 }
 2464 
 2465 static void
 2466 dsp_sysinit(void *p)
 2467 {
 2468         if (dsp_ehtag != NULL)
 2469                 return;
 2470         /* initialize unit numbering */
 2471         snd_unit_init();
 2472         dsp_umax = PCMMAXUNIT;
 2473         dsp_cmax = PCMMAXCHAN;
 2474         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
 2475 }
 2476 
 2477 static void
 2478 dsp_sysuninit(void *p)
 2479 {
 2480         if (dsp_ehtag == NULL)
 2481                 return;
 2482         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
 2483         dsp_ehtag = NULL;
 2484 }
 2485 
 2486 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
 2487 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
 2488 
 2489 char *
 2490 dsp_unit2name(char *buf, size_t len, int unit)
 2491 {
 2492         int i, dtype;
 2493 
 2494         KASSERT(buf != NULL && len != 0,
 2495             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
 2496 
 2497         dtype = snd_unit2d(unit);
 2498 
 2499         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2500                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 2501                         continue;
 2502                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
 2503                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
 2504                 return (buf);
 2505         }
 2506 
 2507         return (NULL);
 2508 }
 2509 
 2510 /**
 2511  * @brief Handler for SNDCTL_AUDIOINFO.
 2512  *
 2513  * Gathers information about the audio device specified in ai->dev.  If
 2514  * ai->dev == -1, then this function gathers information about the current
 2515  * device.  If the call comes in on a non-audio device and ai->dev == -1,
 2516  * return EINVAL.
 2517  *
 2518  * This routine is supposed to go practically straight to the hardware,
 2519  * getting capabilities directly from the sound card driver, side-stepping
 2520  * the intermediate channel interface.
 2521  *
 2522  * Note, however, that the usefulness of this command is significantly
 2523  * decreased when requesting info about any device other than the one serving
 2524  * the request. While each snddev_channel refers to a specific device node,
 2525  * the converse is *not* true.  Currently, when a sound device node is opened,
 2526  * the sound subsystem scans for an available audio channel (or channels, if
 2527  * opened in read+write) and then assigns them to the si_drv[12] private
 2528  * data fields.  As a result, any information returned linking a channel to
 2529  * a specific character device isn't necessarily accurate.
 2530  *
 2531  * @note
 2532  * Calling threads must not hold any snddev_info or pcm_channel locks.
 2533  * 
 2534  * @param dev           device on which the ioctl was issued
 2535  * @param ai            ioctl request data container
 2536  *
 2537  * @retval 0            success
 2538  * @retval EINVAL       ai->dev specifies an invalid device
 2539  *
 2540  * @todo Verify correctness of Doxygen tags.  ;)
 2541  */
 2542 int
 2543 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
 2544 {
 2545         struct pcmchan_caps *caps;
 2546         struct pcm_channel *ch;
 2547         struct snddev_info *d;
 2548         uint32_t fmts;
 2549         int i, nchan, *rates, minch, maxch;
 2550         char *devname, buf[CHN_NAMELEN];
 2551 
 2552         /*
 2553          * If probing the device that received the ioctl, make sure it's a
 2554          * DSP device.  (Users may use this ioctl with /dev/mixer and
 2555          * /dev/midi.)
 2556          */
 2557         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
 2558                 return (EINVAL);
 2559 
 2560         ch = NULL;
 2561         devname = NULL;
 2562         nchan = 0;
 2563         bzero(buf, sizeof(buf));
 2564 
 2565         /*
 2566          * Search for the requested audio device (channel).  Start by
 2567          * iterating over pcm devices.
 2568          */ 
 2569         for (i = 0; pcm_devclass != NULL &&
 2570             i < devclass_get_maxunit(pcm_devclass); i++) {
 2571                 d = devclass_get_softc(pcm_devclass, i);
 2572                 if (!PCM_REGISTERED(d))
 2573                         continue;
 2574 
 2575                 /* XXX Need Giant magic entry ??? */
 2576 
 2577                 /* See the note in function docblock */
 2578                 PCM_UNLOCKASSERT(d);
 2579                 PCM_LOCK(d);
 2580 
 2581                 CHN_FOREACH(ch, d, channels.pcm) {
 2582                         CHN_UNLOCKASSERT(ch);
 2583                         CHN_LOCK(ch);
 2584                         if (ai->dev == -1) {
 2585                                 if (DSP_REGISTERED(d, i_dev) &&
 2586                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
 2587                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
 2588                                         devname = dsp_unit2name(buf,
 2589                                             sizeof(buf), ch->unit);
 2590                                 }
 2591                         } else if (ai->dev == nchan) {
 2592                                 devname = dsp_unit2name(buf, sizeof(buf),
 2593                                     ch->unit);
 2594                         }
 2595                         if (devname != NULL)
 2596                                 break;
 2597                         CHN_UNLOCK(ch);
 2598                         ++nchan;
 2599                 }
 2600 
 2601                 if (devname != NULL) {
 2602                         /*
 2603                          * At this point, the following synchronization stuff
 2604                          * has happened:
 2605                          * - a specific PCM device is locked.
 2606                          * - a specific audio channel has been locked, so be
 2607                          *   sure to unlock when exiting;
 2608                          */
 2609 
 2610                         caps = chn_getcaps(ch);
 2611 
 2612                         /*
 2613                          * With all handles collected, zero out the user's
 2614                          * container and begin filling in its fields.
 2615                          */
 2616                         bzero((void *)ai, sizeof(oss_audioinfo));
 2617 
 2618                         ai->dev = nchan;
 2619                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
 2620 
 2621                         if ((ch->flags & CHN_F_BUSY) == 0)
 2622                                 ai->busy = 0;
 2623                         else
 2624                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
 2625 
 2626                         /**
 2627                          * @note
 2628                          * @c cmd - OSSv4 docs: "Only supported under Linux at
 2629                          *    this moment." Cop-out, I know, but I'll save
 2630                          *    running around in the process table for later.
 2631                          *    Is there a risk of leaking information?
 2632                          */
 2633                         ai->pid = ch->pid;
 2634 
 2635                         /*
 2636                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
 2637                          * Note, however, that a single channel operates in
 2638                          * only one direction, so PCM_CAP_DUPLEX is out.
 2639                          */
 2640                         /**
 2641                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
 2642                          *       these in pcmchan::caps?
 2643                          */
 2644                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
 2645                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
 2646 
 2647                         /*
 2648                          * Collect formats supported @b natively by the
 2649                          * device.  Also determine min/max channels.  (I.e.,
 2650                          * mono, stereo, or both?)
 2651                          *
 2652                          * If any channel is stereo, maxch = 2;
 2653                          * if all channels are stereo, minch = 2, too;
 2654                          * if any channel is mono, minch = 1;
 2655                          * and if all channels are mono, maxch = 1.
 2656                          */
 2657                         minch = 0;
 2658                         maxch = 0;
 2659                         fmts = 0;
 2660                         for (i = 0; caps->fmtlist[i]; i++) {
 2661                                 fmts |= caps->fmtlist[i];
 2662                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
 2663                                         minch = (minch == 0) ? 2 : minch;
 2664                                         maxch = 2;
 2665                                 } else {
 2666                                         minch = 1;
 2667                                         maxch = (maxch == 0) ? 1 : maxch;
 2668                                 }
 2669                         }
 2670 
 2671                         if (ch->direction == PCMDIR_PLAY)
 2672                                 ai->oformats = fmts;
 2673                         else
 2674                                 ai->iformats = fmts;
 2675 
 2676                         /**
 2677                          * @note
 2678                          * @c magic - OSSv4 docs: "Reserved for internal use
 2679                          *    by OSS."
 2680                          *
 2681                          * @par
 2682                          * @c card_number - OSSv4 docs: "Number of the sound
 2683                          *    card where this device belongs or -1 if this
 2684                          *    information is not available.  Applications
 2685                          *    should normally not use this field for any
 2686                          *    purpose."
 2687                          */
 2688                         ai->card_number = -1;
 2689                         /**
 2690                          * @todo @c song_name - depends first on
 2691                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
 2692                          *          on SNDCTL_[GS]ETLABEL
 2693                          * @todo @c port_number - routing information?
 2694                          */
 2695                         ai->port_number = -1;
 2696                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
 2697                         /**
 2698                          * @note
 2699                          * @c real_device - OSSv4 docs:  "Obsolete."
 2700                          */
 2701                         ai->real_device = -1;
 2702                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
 2703                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
 2704                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
 2705                         /**
 2706                          * @note
 2707                          * @c flags - OSSv4 docs: "Reserved for future use."
 2708                          *
 2709                          * @note
 2710                          * @c binding - OSSv4 docs: "Reserved for future use."
 2711                          *
 2712                          * @todo @c handle - haven't decided how to generate
 2713                          *       this yet; bus, vendor, device IDs?
 2714                          */
 2715                         ai->min_rate = caps->minspeed;
 2716                         ai->max_rate = caps->maxspeed;
 2717 
 2718                         ai->min_channels = minch;
 2719                         ai->max_channels = maxch;
 2720 
 2721                         ai->nrates = chn_getrates(ch, &rates);
 2722                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
 2723                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
 2724 
 2725                         for (i = 0; i < ai->nrates; i++)
 2726                                 ai->rates[i] = rates[i];
 2727                         
 2728                         ai->next_play_engine = 0;
 2729                         ai->next_rec_engine = 0;
 2730 
 2731                         CHN_UNLOCK(ch);
 2732                 }
 2733 
 2734                 PCM_UNLOCK(d);
 2735 
 2736                 if (devname != NULL)
 2737                         return (0);
 2738         }
 2739 
 2740         /* Exhausted the search -- nothing is locked, so return. */
 2741         return (EINVAL);
 2742 }
 2743 
 2744 /**
 2745  * @brief Assigns a PCM channel to a sync group.
 2746  *
 2747  * Sync groups are used to enable audio operations on multiple devices
 2748  * simultaneously.  They may be used with any number of devices and may
 2749  * span across applications.  Devices are added to groups with
 2750  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
 2751  * SNDCTL_DSP_SYNCSTART ioctl.
 2752  *
 2753  * If the @c id field of the @c group parameter is set to zero, then a new
 2754  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
 2755  * the group specified.
 2756  *
 2757  * @todo As far as memory allocation, should we assume that things are
 2758  *       okay and allocate with M_WAITOK before acquiring channel locks,
 2759  *       freeing later if not?
 2760  *
 2761  * @param wrch  output channel associated w/ device (if any)
 2762  * @param rdch  input channel associated w/ device (if any)
 2763  * @param group Sync group parameters
 2764  *
 2765  * @retval 0            success
 2766  * @retval non-zero     error to be propagated upstream
 2767  */
 2768 static int
 2769 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
 2770 {
 2771         struct pcmchan_syncmember *smrd, *smwr;
 2772         struct pcmchan_syncgroup *sg;
 2773         int ret, sg_ids[3];
 2774 
 2775         smrd = NULL;
 2776         smwr = NULL;
 2777         sg = NULL;
 2778         ret = 0;
 2779 
 2780         /*
 2781          * Free_unr() may sleep, so store released syncgroup IDs until after
 2782          * all locks are released.
 2783          */
 2784         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
 2785 
 2786         PCM_SG_LOCK();
 2787 
 2788         /*
 2789          * - Insert channel(s) into group's member list.
 2790          * - Set CHN_F_NOTRIGGER on channel(s).
 2791          * - Stop channel(s).  
 2792          */
 2793 
 2794         /*
 2795          * If device's channels are already mapped to a group, unmap them.
 2796          */
 2797         if (wrch) {
 2798                 CHN_LOCK(wrch);
 2799                 sg_ids[0] = chn_syncdestroy(wrch);
 2800         }
 2801 
 2802         if (rdch) {
 2803                 CHN_LOCK(rdch);
 2804                 sg_ids[1] = chn_syncdestroy(rdch);
 2805         }
 2806 
 2807         /*
 2808          * Verify that mode matches character device properites.
 2809          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
 2810          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
 2811          */
 2812         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
 2813             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
 2814                 ret = EINVAL;
 2815                 goto out;
 2816         }
 2817 
 2818         /*
 2819          * An id of zero indicates the user wants to create a new
 2820          * syncgroup.
 2821          */
 2822         if (group->id == 0) {
 2823                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 2824                 if (sg != NULL) {
 2825                         SLIST_INIT(&sg->members);
 2826                         sg->id = alloc_unr(pcmsg_unrhdr);
 2827 
 2828                         group->id = sg->id;
 2829                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
 2830                 } else
 2831                         ret = ENOMEM;
 2832         } else {
 2833                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2834                         if (sg->id == group->id)
 2835                                 break;
 2836                 }
 2837                 if (sg == NULL)
 2838                         ret = EINVAL;
 2839         }
 2840 
 2841         /* Couldn't create or find a syncgroup.  Fail. */
 2842         if (sg == NULL)
 2843                 goto out;
 2844 
 2845         /*
 2846          * Allocate a syncmember, assign it and a channel together, and
 2847          * insert into syncgroup.
 2848          */
 2849         if (group->mode & PCM_ENABLE_INPUT) {
 2850                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 2851                 if (smrd == NULL) {
 2852                         ret = ENOMEM;
 2853                         goto out;
 2854                 }
 2855 
 2856                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
 2857                 smrd->parent = sg;
 2858                 smrd->ch = rdch;
 2859 
 2860                 chn_abort(rdch);
 2861                 rdch->flags |= CHN_F_NOTRIGGER;
 2862                 rdch->sm = smrd;
 2863         }
 2864 
 2865         if (group->mode & PCM_ENABLE_OUTPUT) {
 2866                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 2867                 if (smwr == NULL) {
 2868                         ret = ENOMEM;
 2869                         goto out;
 2870                 }
 2871 
 2872                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
 2873                 smwr->parent = sg;
 2874                 smwr->ch = wrch;
 2875 
 2876                 chn_abort(wrch);
 2877                 wrch->flags |= CHN_F_NOTRIGGER;
 2878                 wrch->sm = smwr;
 2879         }
 2880 
 2881 
 2882 out:
 2883         if (ret != 0) {
 2884                 if (smrd != NULL)
 2885                         free(smrd, M_DEVBUF);
 2886                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
 2887                         sg_ids[2] = sg->id;
 2888                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2889                         free(sg, M_DEVBUF);
 2890                 }
 2891 
 2892                 if (wrch)
 2893                         wrch->sm = NULL;
 2894                 if (rdch)
 2895                         rdch->sm = NULL;
 2896         }
 2897 
 2898         if (wrch)
 2899                 CHN_UNLOCK(wrch);
 2900         if (rdch)
 2901                 CHN_UNLOCK(rdch);
 2902 
 2903         PCM_SG_UNLOCK();
 2904 
 2905         if (sg_ids[0])
 2906                 free_unr(pcmsg_unrhdr, sg_ids[0]);
 2907         if (sg_ids[1])
 2908                 free_unr(pcmsg_unrhdr, sg_ids[1]);
 2909         if (sg_ids[2])
 2910                 free_unr(pcmsg_unrhdr, sg_ids[2]);
 2911 
 2912         return (ret);
 2913 }
 2914 
 2915 /**
 2916  * @brief Launch a sync group into action
 2917  *
 2918  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
 2919  * iterates over all members, triggering them along the way.
 2920  *
 2921  * @note Caller must not hold any channel locks.
 2922  *
 2923  * @param sg_id sync group identifier
 2924  *
 2925  * @retval 0    success
 2926  * @retval non-zero     error worthy of propagating upstream to user
 2927  */
 2928 static int
 2929 dsp_oss_syncstart(int sg_id)
 2930 {
 2931         struct pcmchan_syncmember *sm, *sm_tmp;
 2932         struct pcmchan_syncgroup *sg;
 2933         struct pcm_channel *c;
 2934         int ret, needlocks;
 2935 
 2936         /* Get the synclists lock */
 2937         PCM_SG_LOCK();
 2938 
 2939         do {
 2940                 ret = 0;
 2941                 needlocks = 0;
 2942 
 2943                 /* Search for syncgroup by ID */
 2944                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2945                         if (sg->id == sg_id)
 2946                                 break;
 2947                 }
 2948 
 2949                 /* Return EINVAL if not found */
 2950                 if (sg == NULL) {
 2951                         ret = EINVAL;
 2952                         break;
 2953                 }
 2954 
 2955                 /* Any removals resulting in an empty group should've handled this */
 2956                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
 2957 
 2958                 /*
 2959                  * Attempt to lock all member channels - if any are already
 2960                  * locked, unlock those acquired, sleep for a bit, and try
 2961                  * again.
 2962                  */
 2963                 SLIST_FOREACH(sm, &sg->members, link) {
 2964                         if (CHN_TRYLOCK(sm->ch) == 0) {
 2965                                 int timo = hz * 5/1000; 
 2966                                 if (timo < 1)
 2967                                         timo = 1;
 2968 
 2969                                 /* Release all locked channels so far, retry */
 2970                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
 2971                                         /* sm is the member already locked */
 2972                                         if (sm == sm_tmp)
 2973                                                 break;
 2974                                         CHN_UNLOCK(sm_tmp->ch);
 2975                                 }
 2976 
 2977                                 /** @todo Is PRIBIO correct/ */
 2978                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
 2979                                     PRIBIO | PCATCH, "pcmsg", timo);
 2980                                 if (ret == EINTR || ret == ERESTART)
 2981                                         break;
 2982 
 2983                                 needlocks = 1;
 2984                                 ret = 0; /* Assumes ret == EAGAIN... */
 2985                         }
 2986                 }
 2987         } while (needlocks && ret == 0);
 2988 
 2989         /* Proceed only if no errors encountered. */
 2990         if (ret == 0) {
 2991                 /* Launch channels */
 2992                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
 2993                         SLIST_REMOVE_HEAD(&sg->members, link);
 2994 
 2995                         c = sm->ch;
 2996                         c->sm = NULL;
 2997                         chn_start(c, 1);
 2998                         c->flags &= ~CHN_F_NOTRIGGER;
 2999                         CHN_UNLOCK(c);
 3000 
 3001                         free(sm, M_DEVBUF);
 3002                 }
 3003 
 3004                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 3005                 free(sg, M_DEVBUF);
 3006         }
 3007 
 3008         PCM_SG_UNLOCK();
 3009 
 3010         /*
 3011          * Free_unr() may sleep, so be sure to give up the syncgroup lock
 3012          * first.
 3013          */
 3014         if (ret == 0)
 3015                 free_unr(pcmsg_unrhdr, sg_id);
 3016 
 3017         return (ret);
 3018 }
 3019 
 3020 /**
 3021  * @brief Handler for SNDCTL_DSP_POLICY
 3022  *
 3023  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
 3024  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
 3025  * specifying those two parameters, s/he simply selects a number from 0..10
 3026  * which corresponds to a buffer size.  Smaller numbers request smaller
 3027  * buffers with lower latencies (at greater overhead from more frequent
 3028  * interrupts), while greater numbers behave in the opposite manner.
 3029  *
 3030  * The 4Front spec states that a value of 5 should be the default.  However,
 3031  * this implementation deviates slightly by using a linear scale without
 3032  * consulting drivers.  I.e., even though drivers may have different default
 3033  * buffer sizes, a policy argument of 5 will have the same result across
 3034  * all drivers.
 3035  *
 3036  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
 3037  * more information.
 3038  *
 3039  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
 3040  *       work with hardware drivers directly.
 3041  *
 3042  * @note PCM channel arguments must not be locked by caller.
 3043  *
 3044  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
 3045  * @param rdch  " recording channel (optional; may be NULL)
 3046  * @param policy Integer from [0:10]
 3047  *
 3048  * @retval 0    constant (for now)
 3049  */
 3050 static int
 3051 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
 3052 {
 3053         int ret;
 3054 
 3055         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
 3056                 return (EIO);
 3057 
 3058         /* Default: success */
 3059         ret = 0;
 3060 
 3061         if (rdch) {
 3062                 CHN_LOCK(rdch);
 3063                 ret = chn_setlatency(rdch, policy);
 3064                 CHN_UNLOCK(rdch);
 3065         }
 3066 
 3067         if (wrch && ret == 0) {
 3068                 CHN_LOCK(wrch);
 3069                 ret = chn_setlatency(wrch, policy);
 3070                 CHN_UNLOCK(wrch);
 3071         }
 3072 
 3073         if (ret)
 3074                 ret = EIO;
 3075 
 3076         return (ret);
 3077 }
 3078 
 3079 /**
 3080  * @brief Enable or disable "cooked" mode
 3081  *
 3082  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
 3083  * is the default, the sound system handles rate and format conversions
 3084  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
 3085  * operates with 44100Hz/16bit/signed samples).
 3086  *
 3087  * Disabling cooked mode is intended for applications wanting to mmap()
 3088  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
 3089  * feeder architecture, presumably to gain as much control over audio
 3090  * hardware as possible.
 3091  *
 3092  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
 3093  * for more details.
 3094  *
 3095  * @param wrch          playback channel (optional; may be NULL)
 3096  * @param rdch          recording channel (optional; may be NULL)
 3097  * @param enabled       0 = raw mode, 1 = cooked mode
 3098  *
 3099  * @retval EINVAL       Operation not yet supported.
 3100  */
 3101 static int
 3102 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
 3103 {
 3104 
 3105         /*
 3106          * XXX I just don't get it. Why don't they call it
 3107          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
 3108          * This is just plain so confusing, incoherent,
 3109          * <insert any non-printable characters here>.
 3110          */
 3111         if (!(enabled == 1 || enabled == 0))
 3112                 return (EINVAL);
 3113 
 3114         /*
 3115          * I won't give in. I'm inverting its logic here and now.
 3116          * Brag all you want, but "BITPERFECT" should be the better
 3117          * term here.
 3118          */
 3119         enabled ^= 0x00000001;
 3120 
 3121         if (wrch != NULL) {
 3122                 CHN_LOCK(wrch);
 3123                 wrch->flags &= ~CHN_F_BITPERFECT;
 3124                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3125                 CHN_UNLOCK(wrch);
 3126         }
 3127 
 3128         if (rdch != NULL) {
 3129                 CHN_LOCK(rdch);
 3130                 rdch->flags &= ~CHN_F_BITPERFECT;
 3131                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3132                 CHN_UNLOCK(rdch);
 3133         }
 3134 
 3135         return (0);
 3136 }
 3137 
 3138 /**
 3139  * @brief Retrieve channel interleaving order
 3140  *
 3141  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
 3142  *
 3143  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
 3144  * for more details.
 3145  *
 3146  * @note As the ioctl definition is still under construction, FreeBSD
 3147  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
 3148  *
 3149  * @param wrch  playback channel (optional; may be NULL)
 3150  * @param rdch  recording channel (optional; may be NULL)
 3151  * @param map   channel map (result will be stored there)
 3152  *
 3153  * @retval EINVAL       Operation not yet supported.
 3154  */
 3155 static int
 3156 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3157 {
 3158         struct pcm_channel *ch;
 3159         int ret;
 3160 
 3161         ch = (wrch != NULL) ? wrch : rdch;
 3162         if (ch != NULL) {
 3163                 CHN_LOCK(ch);
 3164                 ret = chn_oss_getorder(ch, map);
 3165                 CHN_UNLOCK(ch);
 3166         } else
 3167                 ret = EINVAL;
 3168 
 3169         return (ret);
 3170 }
 3171 
 3172 /**
 3173  * @brief Specify channel interleaving order
 3174  *
 3175  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
 3176  *
 3177  * @note As the ioctl definition is still under construction, FreeBSD
 3178  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
 3179  *
 3180  * @param wrch  playback channel (optional; may be NULL)
 3181  * @param rdch  recording channel (optional; may be NULL)
 3182  * @param map   channel map
 3183  *
 3184  * @retval EINVAL       Operation not yet supported.
 3185  */
 3186 static int
 3187 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3188 {
 3189         int ret;
 3190 
 3191         ret = 0;
 3192 
 3193         if (wrch != NULL) {
 3194                 CHN_LOCK(wrch);
 3195                 ret = chn_oss_setorder(wrch, map);
 3196                 CHN_UNLOCK(wrch);
 3197         }
 3198 
 3199         if (ret == 0 && rdch != NULL) {
 3200                 CHN_LOCK(rdch);
 3201                 ret = chn_oss_setorder(rdch, map);
 3202                 CHN_UNLOCK(rdch);
 3203         }
 3204 
 3205         return (ret);
 3206 }
 3207 
 3208 static int
 3209 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
 3210     int *mask)
 3211 {
 3212         struct pcm_channel *ch;
 3213         uint32_t chnmask;
 3214         int ret;
 3215 
 3216         chnmask = 0;
 3217         ch = (wrch != NULL) ? wrch : rdch;
 3218 
 3219         if (ch != NULL) {
 3220                 CHN_LOCK(ch);
 3221                 ret = chn_oss_getmask(ch, &chnmask);
 3222                 CHN_UNLOCK(ch);
 3223         } else
 3224                 ret = EINVAL;
 3225 
 3226         if (ret == 0)
 3227                 *mask = chnmask;
 3228 
 3229         return (ret);
 3230 }
 3231 
 3232 #ifdef OSSV4_EXPERIMENT
 3233 /**
 3234  * @brief Retrieve an audio device's label
 3235  *
 3236  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
 3237  *
 3238  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3239  * for more details.
 3240  *
 3241  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
 3242  * consoles) can show variable "labels" for certain controls. By default
 3243  * the application name (say quake) is shown as the label but
 3244  * applications may change the labels themselves."
 3245  *
 3246  * @note As the ioctl definition is still under construction, FreeBSD
 3247  *       does not currently support @c SNDCTL_GETLABEL.
 3248  *
 3249  * @param wrch  playback channel (optional; may be NULL)
 3250  * @param rdch  recording channel (optional; may be NULL)
 3251  * @param label label gets copied here
 3252  *
 3253  * @retval EINVAL       Operation not yet supported.
 3254  */
 3255 static int
 3256 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3257 {
 3258         return (EINVAL);
 3259 }
 3260 
 3261 /**
 3262  * @brief Specify an audio device's label
 3263  *
 3264  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
 3265  * comments for @c dsp_oss_getlabel immediately above.
 3266  *
 3267  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3268  * for more details.
 3269  *
 3270  * @note As the ioctl definition is still under construction, FreeBSD
 3271  *       does not currently support SNDCTL_SETLABEL.
 3272  *
 3273  * @param wrch  playback channel (optional; may be NULL)
 3274  * @param rdch  recording channel (optional; may be NULL)
 3275  * @param label label gets copied from here
 3276  *
 3277  * @retval EINVAL       Operation not yet supported.
 3278  */
 3279 static int
 3280 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3281 {
 3282         return (EINVAL);
 3283 }
 3284 
 3285 /**
 3286  * @brief Retrieve name of currently played song
 3287  *
 3288  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
 3289  * tell the system the name of the currently playing song, which would be
 3290  * visible in @c /dev/sndstat.
 3291  *
 3292  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
 3293  * for more details.
 3294  *
 3295  * @note As the ioctl definition is still under construction, FreeBSD
 3296  *       does not currently support SNDCTL_GETSONG.
 3297  *
 3298  * @param wrch  playback channel (optional; may be NULL)
 3299  * @param rdch  recording channel (optional; may be NULL)
 3300  * @param song  song name gets copied here
 3301  *
 3302  * @retval EINVAL       Operation not yet supported.
 3303  */
 3304 static int
 3305 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3306 {
 3307         return (EINVAL);
 3308 }
 3309 
 3310 /**
 3311  * @brief Retrieve name of currently played song
 3312  *
 3313  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
 3314  * tell the system the name of the currently playing song, which would be
 3315  * visible in @c /dev/sndstat.
 3316  *
 3317  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
 3318  * for more details.
 3319  *
 3320  * @note As the ioctl definition is still under construction, FreeBSD
 3321  *       does not currently support SNDCTL_SETSONG.
 3322  *
 3323  * @param wrch  playback channel (optional; may be NULL)
 3324  * @param rdch  recording channel (optional; may be NULL)
 3325  * @param song  song name gets copied from here
 3326  *
 3327  * @retval EINVAL       Operation not yet supported.
 3328  */
 3329 static int
 3330 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3331 {
 3332         return (EINVAL);
 3333 }
 3334 
 3335 /**
 3336  * @brief Rename a device
 3337  *
 3338  * This is a handler for the @c SNDCTL_SETNAME ioctl.
 3339  *
 3340  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
 3341  * more details.
 3342  *
 3343  * From Hannu@4Front:  "This call is used to change the device name
 3344  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
 3345  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
 3346  * name depending on the current context (for example 'OSS virtual wave table
 3347  * synth' or 'VoIP link to London')."
 3348  *
 3349  * @note As the ioctl definition is still under construction, FreeBSD
 3350  *       does not currently support SNDCTL_SETNAME.
 3351  *
 3352  * @param wrch  playback channel (optional; may be NULL)
 3353  * @param rdch  recording channel (optional; may be NULL)
 3354  * @param name  new device name gets copied from here
 3355  *
 3356  * @retval EINVAL       Operation not yet supported.
 3357  */
 3358 static int
 3359 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
 3360 {
 3361         return (EINVAL);
 3362 }
 3363 #endif  /* !OSSV4_EXPERIMENT */

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