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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifdef HAVE_KERNEL_OPTION_HEADERS
   30 #include "opt_snd.h"
   31 #endif
   32 
   33 #include <dev/sound/pcm/sound.h>
   34 #include <sys/ctype.h>
   35 #include <sys/sysent.h>
   36 
   37 SND_DECLARE_FILE("$FreeBSD: releng/8.1/sys/dev/sound/pcm/dsp.c 205972 2010-03-31 08:03:49Z mav $");
   38 
   39 static int dsp_mmap_allow_prot_exec = 0;
   40 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
   41     &dsp_mmap_allow_prot_exec, 0,
   42     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
   43 
   44 struct dsp_cdevinfo {
   45         struct pcm_channel *rdch, *wrch;
   46         struct pcm_channel *volch;
   47         int busy, simplex;
   48         TAILQ_ENTRY(dsp_cdevinfo) link;
   49 };
   50 
   51 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
   52 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
   53 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
   54 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
   55 
   56 #define DSP_CDEVINFO_CACHESIZE  8
   57 
   58 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
   59                                  (y) != NULL && (y)->si_drv1 != NULL)
   60 
   61 #define OLDPCM_IOCTL
   62 
   63 static d_open_t dsp_open;
   64 static d_close_t dsp_close;
   65 static d_read_t dsp_read;
   66 static d_write_t dsp_write;
   67 static d_ioctl_t dsp_ioctl;
   68 static d_poll_t dsp_poll;
   69 static d_mmap_t dsp_mmap;
   70 
   71 struct cdevsw dsp_cdevsw = {
   72         .d_version =    D_VERSION,
   73         .d_open =       dsp_open,
   74         .d_close =      dsp_close,
   75         .d_read =       dsp_read,
   76         .d_write =      dsp_write,
   77         .d_ioctl =      dsp_ioctl,
   78         .d_poll =       dsp_poll,
   79         .d_mmap =       dsp_mmap,
   80         .d_name =       "dsp",
   81 };
   82 
   83 static eventhandler_tag dsp_ehtag = NULL;
   84 static int dsp_umax = -1;
   85 static int dsp_cmax = -1;
   86 
   87 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
   88 static int dsp_oss_syncstart(int sg_id);
   89 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
   90 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
   91 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
   92 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
   93 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
   94 #ifdef OSSV4_EXPERIMENT
   95 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
   96 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
   97 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
   98 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
   99 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
  100 #endif
  101 
  102 static struct snddev_info *
  103 dsp_get_info(struct cdev *dev)
  104 {
  105         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
  106 }
  107 
  108 static uint32_t
  109 dsp_get_flags(struct cdev *dev)
  110 {
  111         device_t bdev;
  112 
  113         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  114 
  115         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
  116 }
  117 
  118 static void
  119 dsp_set_flags(struct cdev *dev, uint32_t flags)
  120 {
  121         device_t bdev;
  122 
  123         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  124 
  125         if (bdev != NULL)
  126                 pcm_setflags(bdev, flags);
  127 }
  128 
  129 /*
  130  * return the channels associated with an open device instance.
  131  * lock channels specified.
  132  */
  133 static int
  134 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
  135     uint32_t prio)
  136 {
  137         struct snddev_info *d;
  138         struct pcm_channel *ch;
  139         uint32_t flags;
  140 
  141         if (PCM_SIMPLEX(dev) != 0) {
  142                 d = dsp_get_info(dev);
  143                 if (!PCM_REGISTERED(d))
  144                         return (ENXIO);
  145                 PCM_LOCK(d);
  146                 PCM_WAIT(d);
  147                 PCM_ACQUIRE(d);
  148                 /*
  149                  * Note: order is important -
  150                  *       pcm flags -> prio query flags -> wild guess
  151                  */
  152                 ch = NULL;
  153                 flags = dsp_get_flags(dev);
  154                 if (flags & SD_F_PRIO_WR) {
  155                         ch = PCM_RDCH(dev);
  156                         PCM_RDCH(dev) = NULL;
  157                 } else if (flags & SD_F_PRIO_RD) {
  158                         ch = PCM_WRCH(dev);
  159                         PCM_WRCH(dev) = NULL;
  160                 } else if (prio & SD_F_PRIO_WR) {
  161                         ch = PCM_RDCH(dev);
  162                         PCM_RDCH(dev) = NULL;
  163                         flags |= SD_F_PRIO_WR;
  164                 } else if (prio & SD_F_PRIO_RD) {
  165                         ch = PCM_WRCH(dev);
  166                         PCM_WRCH(dev) = NULL;
  167                         flags |= SD_F_PRIO_RD;
  168                 } else if (PCM_WRCH(dev) != NULL) {
  169                         ch = PCM_RDCH(dev);
  170                         PCM_RDCH(dev) = NULL;
  171                         flags |= SD_F_PRIO_WR;
  172                 } else if (PCM_RDCH(dev) != NULL) {
  173                         ch = PCM_WRCH(dev);
  174                         PCM_WRCH(dev) = NULL;
  175                         flags |= SD_F_PRIO_RD;
  176                 }
  177                 PCM_SIMPLEX(dev) = 0;
  178                 dsp_set_flags(dev, flags);
  179                 if (ch != NULL) {
  180                         CHN_LOCK(ch);
  181                         pcm_chnref(ch, -1);
  182                         pcm_chnrelease(ch);
  183                 }
  184                 PCM_RELEASE(d);
  185                 PCM_UNLOCK(d);
  186         }
  187 
  188         *rdch = PCM_RDCH(dev);
  189         *wrch = PCM_WRCH(dev);
  190 
  191         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
  192                 CHN_LOCK(*rdch);
  193         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
  194                 CHN_LOCK(*wrch);
  195 
  196         return (0);
  197 }
  198 
  199 /* unlock specified channels */
  200 static void
  201 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
  202     uint32_t prio)
  203 {
  204         if (wrch != NULL && (prio & SD_F_PRIO_WR))
  205                 CHN_UNLOCK(wrch);
  206         if (rdch != NULL && (prio & SD_F_PRIO_RD))
  207                 CHN_UNLOCK(rdch);
  208 }
  209 
  210 static void
  211 dsp_cdevinfo_alloc(struct cdev *dev,
  212     struct pcm_channel *rdch, struct pcm_channel *wrch,
  213     struct pcm_channel *volch)
  214 {
  215         struct snddev_info *d;
  216         struct dsp_cdevinfo *cdi;
  217         int simplex;
  218 
  219         d = dsp_get_info(dev);
  220 
  221         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
  222             ((rdch == NULL && wrch == NULL) || rdch != wrch),
  223             ("bogus %s(), what are you trying to accomplish here?", __func__));
  224         PCM_BUSYASSERT(d);
  225         PCM_LOCKASSERT(d);
  226 
  227         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
  228 
  229         /*
  230          * Scan for free instance entry and put it into the end of list.
  231          * Create new one if necessary.
  232          */
  233         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
  234                 if (cdi->busy != 0)
  235                         break;
  236                 cdi->rdch = rdch;
  237                 cdi->wrch = wrch;
  238                 cdi->volch = volch;
  239                 cdi->simplex = simplex;
  240                 cdi->busy = 1;
  241                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  242                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  243                 dev->si_drv1 = cdi;
  244                 return;
  245         }
  246         PCM_UNLOCK(d);
  247         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  248         PCM_LOCK(d);
  249         cdi->rdch = rdch;
  250         cdi->wrch = wrch;
  251         cdi->volch = volch;
  252         cdi->simplex = simplex;
  253         cdi->busy = 1;
  254         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  255         dev->si_drv1 = cdi;
  256 }
  257 
  258 static void
  259 dsp_cdevinfo_free(struct cdev *dev)
  260 {
  261         struct snddev_info *d;
  262         struct dsp_cdevinfo *cdi, *tmp;
  263         uint32_t flags;
  264         int i;
  265 
  266         d = dsp_get_info(dev);
  267 
  268         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
  269             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
  270             PCM_VOLCH(dev) == NULL,
  271             ("bogus %s(), what are you trying to accomplish here?", __func__));
  272         PCM_BUSYASSERT(d);
  273         PCM_LOCKASSERT(d);
  274 
  275         cdi = dev->si_drv1;
  276         dev->si_drv1 = NULL;
  277         cdi->rdch = NULL;
  278         cdi->wrch = NULL;
  279         cdi->volch = NULL;
  280         cdi->simplex = 0;
  281         cdi->busy = 0;
  282 
  283         /*
  284          * Once it is free, move it back to the beginning of list for
  285          * faster new entry allocation.
  286          */
  287         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  288         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  289 
  290         /*
  291          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
  292          * Reset simplex flags.
  293          */
  294         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
  295         i = DSP_CDEVINFO_CACHESIZE;
  296         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
  297                 if (cdi->busy != 0) {
  298                         if (cdi->simplex == 0) {
  299                                 if (cdi->rdch != NULL)
  300                                         flags |= SD_F_PRIO_RD;
  301                                 if (cdi->wrch != NULL)
  302                                         flags |= SD_F_PRIO_WR;
  303                         }
  304                 } else {
  305                         if (i == 0) {
  306                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  307                                 free(cdi, M_DEVBUF);
  308                         } else
  309                                 i--;
  310                 }
  311         }
  312         dsp_set_flags(dev, flags);
  313 }
  314 
  315 void
  316 dsp_cdevinfo_init(struct snddev_info *d)
  317 {
  318         struct dsp_cdevinfo *cdi;
  319         int i;
  320 
  321         KASSERT(d != NULL, ("NULL snddev_info"));
  322         PCM_BUSYASSERT(d);
  323         PCM_UNLOCKASSERT(d);
  324 
  325         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  326         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
  327                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  328                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  329         }
  330 }
  331 
  332 void
  333 dsp_cdevinfo_flush(struct snddev_info *d)
  334 {
  335         struct dsp_cdevinfo *cdi, *tmp;
  336 
  337         KASSERT(d != NULL, ("NULL snddev_info"));
  338         PCM_BUSYASSERT(d);
  339         PCM_UNLOCKASSERT(d);
  340 
  341         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
  342         while (cdi != NULL) {
  343                 tmp = TAILQ_NEXT(cdi, link);
  344                 free(cdi, M_DEVBUF);
  345                 cdi = tmp;
  346         }
  347         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  348 }
  349 
  350 /* duplex / simplex cdev type */
  351 enum {
  352         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
  353         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
  354         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
  355 };
  356 
  357 enum {
  358         DSP_CDEV_VOLCTL_NONE,
  359         DSP_CDEV_VOLCTL_READ,
  360         DSP_CDEV_VOLCTL_WRITE
  361 };
  362 
  363 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
  364 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
  365 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
  366 #define DSP_F_READ(x)           ((x) & FREAD)
  367 #define DSP_F_WRITE(x)          ((x) & FWRITE)
  368 
  369 static const struct {
  370         int type;
  371         char *name;
  372         char *sep;
  373         char *alias;
  374         int use_sep;
  375         int hw;
  376         int max;
  377         int volctl;
  378         uint32_t fmt, spd;
  379         int query;
  380 } dsp_cdevs[] = {
  381         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
  382           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  383           DSP_CDEV_TYPE_RDWR },
  384         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
  385           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
  386           DSP_CDEV_TYPE_RDWR },
  387         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
  388           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
  389           DSP_CDEV_TYPE_RDWR },
  390         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
  391           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  392         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
  393           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  394         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
  395           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  396         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
  397           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  398         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
  399           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
  400         /* Low priority, OSSv4 aliases. */
  401         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
  402           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  403           DSP_CDEV_TYPE_RDWR },
  404         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
  405           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  406           DSP_CDEV_TYPE_RDWR },
  407         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
  408           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  409           DSP_CDEV_TYPE_RDWR },
  410         { SND_DEV_DSP, "dsp_spdifout",   ".", "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_spdifin",   ".", "dsp", 0, 0, 0, 0,
  414           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  415           DSP_CDEV_TYPE_RDWR },
  416 };
  417 
  418 #define DSP_FIXUP_ERROR()               do {                            \
  419         prio = dsp_get_flags(i_dev);                                    \
  420         if (!DSP_F_VALID(flags))                                        \
  421                 error = EINVAL;                                         \
  422         if (!DSP_F_DUPLEX(flags) &&                                     \
  423             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
  424             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
  425                 error = ENOTSUP;                                        \
  426         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
  427             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
  428             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
  429                 error = EBUSY;                                          \
  430         else if (DSP_REGISTERED(d, i_dev))                              \
  431                 error = EBUSY;                                          \
  432 } while (0)
  433 
  434 static int
  435 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  436 {
  437         struct pcm_channel *rdch, *wrch;
  438         struct snddev_info *d;
  439         uint32_t fmt, spd, prio, volctl;
  440         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
  441 
  442         /* Kind of impossible.. */
  443         if (i_dev == NULL || td == NULL)
  444                 return (ENODEV);
  445 
  446         d = dsp_get_info(i_dev);
  447         if (!PCM_REGISTERED(d))
  448                 return (EBADF);
  449 
  450         PCM_GIANT_ENTER(d);
  451 
  452         /* Lock snddev so nobody else can monkey with it. */
  453         PCM_LOCK(d);
  454         PCM_WAIT(d);
  455 
  456         /*
  457          * Try to acquire cloned device before someone else pick it.
  458          * ENODEV means this is not a cloned droids.
  459          */
  460         error = snd_clone_acquire(i_dev);
  461         if (!(error == 0 || error == ENODEV)) {
  462                 DSP_FIXUP_ERROR();
  463                 PCM_UNLOCK(d);
  464                 PCM_GIANT_EXIT(d);
  465                 return (error);
  466         }
  467 
  468         error = 0;
  469         DSP_FIXUP_ERROR();
  470 
  471         if (error != 0) {
  472                 (void)snd_clone_release(i_dev);
  473                 PCM_UNLOCK(d);
  474                 PCM_GIANT_EXIT(d);
  475                 return (error);
  476         }
  477 
  478         /*
  479          * That is just enough. Acquire and unlock pcm lock so
  480          * the other will just have to wait until we finish doing
  481          * everything.
  482          */
  483         PCM_ACQUIRE(d);
  484         PCM_UNLOCK(d);
  485 
  486         devtype = PCMDEV(i_dev);
  487         wdevunit = -1;
  488         rdevunit = -1;
  489         fmt = 0;
  490         spd = 0;
  491         volctl = DSP_CDEV_VOLCTL_NONE;
  492 
  493         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
  494                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
  495                         continue;
  496                 /*
  497                  * Volume control only valid for DSPHW devices,
  498                  * and it must be opened in opposite direction be it
  499                  * simplex or duplex. Anything else will be handled
  500                  * as usual.
  501                  */
  502                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
  503                         if (dsp_cdevs[i].volctl != 0 &&
  504                             DSP_F_READ(flags)) {
  505                                 volctl = DSP_CDEV_VOLCTL_WRITE;
  506                                 flags &= ~FREAD;
  507                                 flags |= FWRITE;
  508                         }
  509                         if (DSP_F_READ(flags)) {
  510                                 (void)snd_clone_release(i_dev);
  511                                 PCM_RELEASE_QUICK(d);
  512                                 PCM_GIANT_EXIT(d);
  513                                 return (ENOTSUP);
  514                         }
  515                         wdevunit = dev2unit(i_dev);
  516                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
  517                         if (dsp_cdevs[i].volctl != 0 &&
  518                             DSP_F_WRITE(flags)) {
  519                                 volctl = DSP_CDEV_VOLCTL_READ;
  520                                 flags &= ~FWRITE;
  521                                 flags |= FREAD;
  522                         }
  523                         if (DSP_F_WRITE(flags)) {
  524                                 (void)snd_clone_release(i_dev);
  525                                 PCM_RELEASE_QUICK(d);
  526                                 PCM_GIANT_EXIT(d);
  527                                 return (ENOTSUP);
  528                         }
  529                         rdevunit = dev2unit(i_dev);
  530                 }
  531                 fmt = dsp_cdevs[i].fmt;
  532                 spd = dsp_cdevs[i].spd;
  533                 break;
  534         }
  535 
  536         /* No matching devtype? */
  537         if (fmt == 0 || spd == 0)
  538                 panic("impossible devtype %d", devtype);
  539 
  540         rdch = NULL;
  541         wrch = NULL;
  542         rderror = 0;
  543         wrerror = 0;
  544 
  545         /*
  546          * if we get here, the open request is valid- either:
  547          *   * we were previously not open
  548          *   * we were open for play xor record and the opener wants
  549          *     the non-open direction
  550          */
  551         if (DSP_F_READ(flags)) {
  552                 /* open for read */
  553                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
  554                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
  555 
  556                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
  557                         rderror = ENXIO;
  558 
  559                 if (volctl == DSP_CDEV_VOLCTL_READ)
  560                         rderror = 0;
  561 
  562                 if (rderror != 0) {
  563                         if (rdch != NULL)
  564                                 pcm_chnrelease(rdch);
  565                         if (!DSP_F_DUPLEX(flags)) {
  566                                 (void)snd_clone_release(i_dev);
  567                                 PCM_RELEASE_QUICK(d);
  568                                 PCM_GIANT_EXIT(d);
  569                                 return (rderror);
  570                         }
  571                         rdch = NULL;
  572                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
  573                         if (rdch != NULL) {
  574                                 pcm_chnref(rdch, 1);
  575                                 pcm_chnrelease(rdch);
  576                         }
  577                 } else {
  578                         if (flags & O_NONBLOCK)
  579                                 rdch->flags |= CHN_F_NBIO;
  580                         if (flags & O_EXCL)
  581                                 rdch->flags |= CHN_F_EXCLUSIVE;
  582                         pcm_chnref(rdch, 1);
  583                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  584                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
  585                         CHN_UNLOCK(rdch);
  586                 }
  587         }
  588 
  589         if (DSP_F_WRITE(flags)) {
  590                 /* open for write */
  591                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
  592                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
  593 
  594                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
  595                         wrerror = ENXIO;
  596 
  597                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
  598                         wrerror = 0;
  599 
  600                 if (wrerror != 0) {
  601                         if (wrch != NULL)
  602                                 pcm_chnrelease(wrch);
  603                         if (!DSP_F_DUPLEX(flags)) {
  604                                 if (rdch != NULL) {
  605                                         /*
  606                                          * Lock, deref and release previously
  607                                          * created record channel
  608                                          */
  609                                         CHN_LOCK(rdch);
  610                                         pcm_chnref(rdch, -1);
  611                                         pcm_chnrelease(rdch);
  612                                 }
  613                                 (void)snd_clone_release(i_dev);
  614                                 PCM_RELEASE_QUICK(d);
  615                                 PCM_GIANT_EXIT(d);
  616                                 return (wrerror);
  617                         }
  618                         wrch = NULL;
  619                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
  620                         if (wrch != NULL) {
  621                                 pcm_chnref(wrch, 1);
  622                                 pcm_chnrelease(wrch);
  623                         }
  624                 } else {
  625                         if (flags & O_NONBLOCK)
  626                                 wrch->flags |= CHN_F_NBIO;
  627                         if (flags & O_EXCL)
  628                                 wrch->flags |= CHN_F_EXCLUSIVE;
  629                         pcm_chnref(wrch, 1);
  630                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  631                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
  632                         CHN_UNLOCK(wrch);
  633                 }
  634         }
  635 
  636 
  637         PCM_LOCK(d);
  638 
  639         /*
  640          * We're done. Allocate channels information for this cdev.
  641          */
  642         switch (volctl) {
  643         case DSP_CDEV_VOLCTL_READ:
  644                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
  645                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
  646                 break;
  647         case DSP_CDEV_VOLCTL_WRITE:
  648                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
  649                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
  650                 break;
  651         case DSP_CDEV_VOLCTL_NONE:
  652         default:
  653                 if (wrch == NULL && rdch == NULL) {
  654                         (void)snd_clone_release(i_dev);
  655                         PCM_RELEASE(d);
  656                         PCM_UNLOCK(d);
  657                         PCM_GIANT_EXIT(d);
  658                         if (wrerror != 0)
  659                                 return (wrerror);
  660                         if (rderror != 0)
  661                                 return (rderror);
  662                         return (EINVAL);
  663                 }
  664                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
  665                 if (rdch != NULL)
  666                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
  667                 if (wrch != NULL)
  668                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
  669                 break;
  670         }
  671 
  672         /*
  673          * Increase clone refcount for its automatic garbage collector.
  674          */
  675         (void)snd_clone_ref(i_dev);
  676 
  677         PCM_RELEASE(d);
  678         PCM_UNLOCK(d);
  679 
  680         PCM_GIANT_LEAVE(d);
  681 
  682         return (0);
  683 }
  684 
  685 static int
  686 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  687 {
  688         struct pcm_channel *rdch, *wrch, *volch;
  689         struct snddev_info *d;
  690         int sg_ids, rdref, wdref;
  691 
  692         d = dsp_get_info(i_dev);
  693         if (!DSP_REGISTERED(d, i_dev))
  694                 return (EBADF);
  695 
  696         PCM_GIANT_ENTER(d);
  697 
  698         PCM_LOCK(d);
  699         PCM_WAIT(d);
  700         PCM_ACQUIRE(d);
  701 
  702         rdch = PCM_RDCH(i_dev);
  703         wrch = PCM_WRCH(i_dev);
  704         volch = PCM_VOLCH(i_dev);
  705 
  706         PCM_RDCH(i_dev) = NULL;
  707         PCM_WRCH(i_dev) = NULL;
  708         PCM_VOLCH(i_dev) = NULL;
  709 
  710         rdref = -1;
  711         wdref = -1;
  712 
  713         if (volch != NULL) {
  714                 if (volch == rdch)
  715                         rdref--;
  716                 else if (volch == wrch)
  717                         wdref--;
  718                 else {
  719                         CHN_LOCK(volch);
  720                         pcm_chnref(volch, -1);
  721                         CHN_UNLOCK(volch);
  722                 }
  723         }
  724 
  725         if (rdch != NULL)
  726                 CHN_REMOVE(d, rdch, channels.pcm.opened);
  727         if (wrch != NULL)
  728                 CHN_REMOVE(d, wrch, channels.pcm.opened);
  729 
  730         if (rdch != NULL || wrch != NULL) {
  731                 PCM_UNLOCK(d);
  732                 if (rdch != NULL) {
  733                         /*
  734                          * The channel itself need not be locked because:
  735                          *   a)  Adding a channel to a syncgroup happens only
  736                          *       in dsp_ioctl(), which cannot run concurrently
  737                          *       to dsp_close().
  738                          *   b)  The syncmember pointer (sm) is protected by
  739                          *       the global syncgroup list lock.
  740                          *   c)  A channel can't just disappear, invalidating
  741                          *       pointers, unless it's closed/dereferenced
  742                          *       first.
  743                          */
  744                         PCM_SG_LOCK();
  745                         sg_ids = chn_syncdestroy(rdch);
  746                         PCM_SG_UNLOCK();
  747                         if (sg_ids != 0)
  748                                 free_unr(pcmsg_unrhdr, sg_ids);
  749 
  750                         CHN_LOCK(rdch);
  751                         pcm_chnref(rdch, rdref);
  752                         chn_abort(rdch); /* won't sleep */
  753                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  754                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  755                         chn_reset(rdch, 0, 0);
  756                         pcm_chnrelease(rdch);
  757                 }
  758                 if (wrch != NULL) {
  759                         /*
  760                          * Please see block above.
  761                          */
  762                         PCM_SG_LOCK();
  763                         sg_ids = chn_syncdestroy(wrch);
  764                         PCM_SG_UNLOCK();
  765                         if (sg_ids != 0)
  766                                 free_unr(pcmsg_unrhdr, sg_ids);
  767 
  768                         CHN_LOCK(wrch);
  769                         pcm_chnref(wrch, wdref);
  770                         chn_flush(wrch); /* may sleep */
  771                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  772                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  773                         chn_reset(wrch, 0, 0);
  774                         pcm_chnrelease(wrch);
  775                 }
  776                 PCM_LOCK(d);
  777         }
  778 
  779         dsp_cdevinfo_free(i_dev);
  780         /*
  781          * Release clone busy state and unref it so the automatic
  782          * garbage collector will get the hint and do the remaining
  783          * cleanup process.
  784          */
  785         (void)snd_clone_release(i_dev);
  786 
  787         /*
  788          * destroy_dev() might sleep, so release pcm lock
  789          * here and rely on pcm cv serialization.
  790          */
  791         PCM_UNLOCK(d);
  792         (void)snd_clone_unref(i_dev);
  793         PCM_LOCK(d);
  794 
  795         PCM_RELEASE(d);
  796         PCM_UNLOCK(d);
  797 
  798         PCM_GIANT_LEAVE(d);
  799 
  800         return (0);
  801 }
  802 
  803 static __inline int
  804 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
  805 {
  806         struct snddev_info *d;
  807         struct pcm_channel **ch, *rdch, *wrch;
  808         int (*chn_io)(struct pcm_channel *, struct uio *);
  809         int prio, ret;
  810         pid_t runpid;
  811 
  812         KASSERT(i_dev != NULL && buf != NULL &&
  813             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
  814             ("%s(): io train wreck!", __func__));
  815 
  816         d = dsp_get_info(i_dev);
  817         if (!DSP_REGISTERED(d, i_dev))
  818                 return (EBADF);
  819 
  820         PCM_GIANT_ENTER(d);
  821 
  822         switch (buf->uio_rw) {
  823         case UIO_READ:
  824                 prio = SD_F_PRIO_RD;
  825                 ch = &rdch;
  826                 chn_io = chn_read;
  827                 break;
  828         case UIO_WRITE:
  829                 prio = SD_F_PRIO_WR;
  830                 ch = &wrch;
  831                 chn_io = chn_write;
  832                 break;
  833         default:
  834                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
  835                 break;
  836         }
  837 
  838         rdch = NULL;
  839         wrch = NULL;
  840         runpid = buf->uio_td->td_proc->p_pid;
  841 
  842         getchns(i_dev, &rdch, &wrch, prio);
  843 
  844         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
  845                 PCM_GIANT_EXIT(d);
  846                 return (EBADF);
  847         }
  848 
  849         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
  850             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
  851                 relchns(i_dev, rdch, wrch, prio);
  852                 PCM_GIANT_EXIT(d);
  853                 return (EINVAL);
  854         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
  855                 (*ch)->flags |= CHN_F_RUNNING;
  856                 (*ch)->pid = runpid;
  857         }
  858 
  859         /*
  860          * chn_read/write must give up channel lock in order to copy bytes
  861          * from/to userland, so up the "in progress" counter to make sure
  862          * someone else doesn't come along and muss up the buffer.
  863          */
  864         ++(*ch)->inprog;
  865         ret = chn_io(*ch, buf);
  866         --(*ch)->inprog;
  867 
  868         CHN_BROADCAST(&(*ch)->cv);
  869 
  870         relchns(i_dev, rdch, wrch, prio);
  871 
  872         PCM_GIANT_LEAVE(d);
  873 
  874         return (ret);
  875 }
  876 
  877 static int
  878 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
  879 {
  880         return (dsp_io_ops(i_dev, buf));
  881 }
  882 
  883 static int
  884 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
  885 {
  886         return (dsp_io_ops(i_dev, buf));
  887 }
  888 
  889 static int
  890 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
  891 {
  892         struct snddev_info *d;
  893         struct pcm_channel *c;
  894         int unit;
  895 
  896         KASSERT(dev != NULL && volch != NULL,
  897             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
  898 
  899         d = dsp_get_info(dev);
  900         if (!PCM_REGISTERED(d)) {
  901                 *volch = NULL;
  902                 return (EINVAL);
  903         }
  904 
  905         PCM_UNLOCKASSERT(d);
  906 
  907         *volch = NULL;
  908 
  909         c = PCM_VOLCH(dev);
  910         if (c != NULL) {
  911                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
  912                         return (-1);
  913                 *volch = c;
  914                 return (0);
  915         }
  916 
  917         PCM_LOCK(d);
  918         PCM_WAIT(d);
  919         PCM_ACQUIRE(d);
  920 
  921         unit = dev2unit(dev);
  922 
  923         CHN_FOREACH(c, d, channels.pcm) {
  924                 CHN_LOCK(c);
  925                 if (c->unit != unit) {
  926                         CHN_UNLOCK(c);
  927                         continue;
  928                 }
  929                 *volch = c;
  930                 pcm_chnref(c, 1);
  931                 PCM_VOLCH(dev) = c;
  932                 CHN_UNLOCK(c);
  933                 PCM_RELEASE(d);
  934                 PCM_UNLOCK(d);
  935                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
  936         }
  937 
  938         PCM_RELEASE(d);
  939         PCM_UNLOCK(d);
  940 
  941         return (EINVAL);
  942 }
  943 
  944 static int
  945 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
  946     caddr_t arg)
  947 {
  948         struct snddev_info *d;
  949         struct pcm_channel *rdch, *wrch;
  950         int j, devtype, ret;
  951 
  952         d = dsp_get_info(dev);
  953         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
  954                 return (-1);
  955 
  956         PCM_UNLOCKASSERT(d);
  957 
  958         j = cmd & 0xff;
  959 
  960         rdch = PCM_RDCH(dev);
  961         wrch = PCM_WRCH(dev);
  962 
  963         /* No specific channel, look into cache */
  964         if (volch == NULL)
  965                 volch = PCM_VOLCH(dev);
  966 
  967         /* Look harder */
  968         if (volch == NULL) {
  969                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
  970                         volch = rdch;
  971                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
  972                         volch = wrch;
  973         }
  974 
  975         devtype = PCMDEV(dev);
  976 
  977         /* Look super harder */
  978         if (volch == NULL &&
  979             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
  980             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
  981                 ret = dsp_get_volume_channel(dev, &volch);
  982                 if (ret != 0)
  983                         return (ret);
  984                 if (volch == NULL)
  985                         return (EINVAL);
  986         }
  987 
  988         /* Final validation */
  989         if (volch != NULL) {
  990                 CHN_LOCK(volch);
  991                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
  992                         CHN_UNLOCK(volch);
  993                         return (-1);
  994                 }
  995                 if (volch->direction == PCMDIR_PLAY)
  996                         wrch = volch;
  997                 else
  998                         rdch = volch;
  999         }
 1000 
 1001         ret = EINVAL;
 1002 
 1003         if (volch != NULL &&
 1004             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
 1005             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
 1006                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
 1007                         int left, right, center;
 1008 
 1009                         left = *(int *)arg & 0x7f;
 1010                         right = ((*(int *)arg) >> 8) & 0x7f;
 1011                         center = (left + right) >> 1;
 1012                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
 1013                             center);
 1014                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
 1015                         *(int *)arg = CHN_GETVOLUME(volch,
 1016                                 SND_VOL_C_PCM, SND_CHN_T_FL);
 1017                         *(int *)arg |= CHN_GETVOLUME(volch,
 1018                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
 1019                 }
 1020                 ret = 0;
 1021         } else if (rdch != NULL || wrch != NULL) {
 1022                 switch (j) {
 1023                 case SOUND_MIXER_DEVMASK:
 1024                 case SOUND_MIXER_CAPS:
 1025                 case SOUND_MIXER_STEREODEVS:
 1026                         if ((cmd & ~0xff) == MIXER_READ(0)) {
 1027                                 *(int *)arg = 0;
 1028                                 if (rdch != NULL)
 1029                                         *(int *)arg |= SOUND_MASK_RECLEV;
 1030                                 if (wrch != NULL)
 1031                                         *(int *)arg |= SOUND_MASK_PCM;
 1032                         }
 1033                         ret = 0;
 1034                         break;
 1035                 case SOUND_MIXER_RECMASK:
 1036                 case SOUND_MIXER_RECSRC:
 1037                         if ((cmd & ~0xff) == MIXER_READ(0))
 1038                                 *(int *)arg = 0;
 1039                         ret = 0;
 1040                         break;
 1041                 default:
 1042                         break;
 1043                 }
 1044         }
 1045 
 1046         if (volch != NULL)
 1047                 CHN_UNLOCK(volch);
 1048 
 1049         return (ret);
 1050 }
 1051 
 1052 static int
 1053 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
 1054     struct thread *td)
 1055 {
 1056         struct pcm_channel *chn, *rdch, *wrch;
 1057         struct snddev_info *d;
 1058         int *arg_i, ret, tmp, xcmd;
 1059 
 1060         d = dsp_get_info(i_dev);
 1061         if (!DSP_REGISTERED(d, i_dev))
 1062                 return (EBADF);
 1063 
 1064         PCM_GIANT_ENTER(d);
 1065 
 1066         arg_i = (int *)arg;
 1067         ret = 0;
 1068         xcmd = 0;
 1069         chn = NULL;
 1070 
 1071         if (IOCGROUP(cmd) == 'M') {
 1072                 if (cmd == OSS_GETVERSION) {
 1073                         *arg_i = SOUND_VERSION;
 1074                         PCM_GIANT_EXIT(d);
 1075                         return (0);
 1076                 }
 1077                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
 1078                 if (ret != -1) {
 1079                         PCM_GIANT_EXIT(d);
 1080                         return (ret);
 1081                 }
 1082 
 1083                 if (d->mixer_dev != NULL) {
 1084                         PCM_ACQUIRE_QUICK(d);
 1085                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1086                             MIXER_CMD_DIRECT);
 1087                         PCM_RELEASE_QUICK(d);
 1088                 } else
 1089                         ret = EBADF;
 1090 
 1091                 PCM_GIANT_EXIT(d);
 1092 
 1093                 return (ret);
 1094         }
 1095 
 1096         /*
 1097          * Certain ioctls may be made on any type of device (audio, mixer,
 1098          * and MIDI).  Handle those special cases here.
 1099          */
 1100         if (IOCGROUP(cmd) == 'X') {
 1101                 PCM_ACQUIRE_QUICK(d);
 1102                 switch(cmd) {
 1103                 case SNDCTL_SYSINFO:
 1104                         sound_oss_sysinfo((oss_sysinfo *)arg);
 1105                         break;
 1106                 case SNDCTL_CARDINFO:
 1107                         ret = sound_oss_card_info((oss_card_info *)arg);
 1108                         break;
 1109                 case SNDCTL_AUDIOINFO:
 1110                 case SNDCTL_AUDIOINFO_EX:
 1111                 case SNDCTL_ENGINEINFO:
 1112                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
 1113                         break;
 1114                 case SNDCTL_MIXERINFO:
 1115                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
 1116                         break;
 1117                 default:
 1118                         ret = EINVAL;
 1119                 }
 1120                 PCM_RELEASE_QUICK(d);
 1121                 PCM_GIANT_EXIT(d);
 1122                 return (ret);
 1123         }
 1124 
 1125         getchns(i_dev, &rdch, &wrch, 0);
 1126 
 1127         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
 1128                 wrch = NULL;
 1129         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
 1130                 rdch = NULL;
 1131 
 1132         if (wrch == NULL && rdch == NULL) {
 1133                 PCM_GIANT_EXIT(d);
 1134                 return (EINVAL);
 1135         }
 1136 
 1137         switch(cmd) {
 1138 #ifdef OLDPCM_IOCTL
 1139         /*
 1140          * we start with the new ioctl interface.
 1141          */
 1142         case AIONWRITE: /* how many bytes can write ? */
 1143                 if (wrch) {
 1144                         CHN_LOCK(wrch);
 1145 /*
 1146                 if (wrch && wrch->bufhard.dl)
 1147                         while (chn_wrfeed(wrch) == 0);
 1148 */
 1149                         *arg_i = sndbuf_getfree(wrch->bufsoft);
 1150                         CHN_UNLOCK(wrch);
 1151                 } else {
 1152                         *arg_i = 0;
 1153                         ret = EINVAL;
 1154                 }
 1155                 break;
 1156 
 1157         case AIOSSIZE:     /* set the current blocksize */
 1158                 {
 1159                         struct snd_size *p = (struct snd_size *)arg;
 1160 
 1161                         p->play_size = 0;
 1162                         p->rec_size = 0;
 1163                         PCM_ACQUIRE_QUICK(d);
 1164                         if (wrch) {
 1165                                 CHN_LOCK(wrch);
 1166                                 chn_setblocksize(wrch, 2, p->play_size);
 1167                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1168                                 CHN_UNLOCK(wrch);
 1169                         }
 1170                         if (rdch) {
 1171                                 CHN_LOCK(rdch);
 1172                                 chn_setblocksize(rdch, 2, p->rec_size);
 1173                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1174                                 CHN_UNLOCK(rdch);
 1175                         }
 1176                         PCM_RELEASE_QUICK(d);
 1177                 }
 1178                 break;
 1179         case AIOGSIZE:  /* get the current blocksize */
 1180                 {
 1181                         struct snd_size *p = (struct snd_size *)arg;
 1182 
 1183                         if (wrch) {
 1184                                 CHN_LOCK(wrch);
 1185                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1186                                 CHN_UNLOCK(wrch);
 1187                         }
 1188                         if (rdch) {
 1189                                 CHN_LOCK(rdch);
 1190                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1191                                 CHN_UNLOCK(rdch);
 1192                         }
 1193                 }
 1194                 break;
 1195 
 1196         case AIOSFMT:
 1197         case AIOGFMT:
 1198                 {
 1199                         snd_chan_param *p = (snd_chan_param *)arg;
 1200 
 1201                         if (cmd == AIOSFMT &&
 1202                             ((p->play_format != 0 && p->play_rate == 0) ||
 1203                             (p->rec_format != 0 && p->rec_rate == 0))) {
 1204                                 ret = EINVAL;
 1205                                 break;
 1206                         }
 1207                         PCM_ACQUIRE_QUICK(d);
 1208                         if (wrch) {
 1209                                 CHN_LOCK(wrch);
 1210                                 if (cmd == AIOSFMT && p->play_format != 0) {
 1211                                         chn_setformat(wrch,
 1212                                             SND_FORMAT(p->play_format,
 1213                                             AFMT_CHANNEL(wrch->format),
 1214                                             AFMT_EXTCHANNEL(wrch->format)));
 1215                                         chn_setspeed(wrch, p->play_rate);
 1216                                 }
 1217                                 p->play_rate = wrch->speed;
 1218                                 p->play_format = AFMT_ENCODING(wrch->format);
 1219                                 CHN_UNLOCK(wrch);
 1220                         } else {
 1221                                 p->play_rate = 0;
 1222                                 p->play_format = 0;
 1223                         }
 1224                         if (rdch) {
 1225                                 CHN_LOCK(rdch);
 1226                                 if (cmd == AIOSFMT && p->rec_format != 0) {
 1227                                         chn_setformat(rdch,
 1228                                             SND_FORMAT(p->rec_format,
 1229                                             AFMT_CHANNEL(rdch->format),
 1230                                             AFMT_EXTCHANNEL(rdch->format)));
 1231                                         chn_setspeed(rdch, p->rec_rate);
 1232                                 }
 1233                                 p->rec_rate = rdch->speed;
 1234                                 p->rec_format = AFMT_ENCODING(rdch->format);
 1235                                 CHN_UNLOCK(rdch);
 1236                         } else {
 1237                                 p->rec_rate = 0;
 1238                                 p->rec_format = 0;
 1239                         }
 1240                         PCM_RELEASE_QUICK(d);
 1241                 }
 1242                 break;
 1243 
 1244         case AIOGCAP:     /* get capabilities */
 1245                 {
 1246                         snd_capabilities *p = (snd_capabilities *)arg;
 1247                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
 1248                         struct cdev *pdev;
 1249 
 1250                         PCM_LOCK(d);
 1251                         if (rdch) {
 1252                                 CHN_LOCK(rdch);
 1253                                 rcaps = chn_getcaps(rdch);
 1254                         }
 1255                         if (wrch) {
 1256                                 CHN_LOCK(wrch);
 1257                                 pcaps = chn_getcaps(wrch);
 1258                         }
 1259                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
 1260                                           pcaps? pcaps->minspeed : 0);
 1261                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
 1262                                           pcaps? pcaps->maxspeed : 1000000);
 1263                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
 1264                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
 1265                         /* XXX bad on sb16 */
 1266                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
 1267                                      (wrch? chn_getformats(wrch) : 0xffffffff);
 1268                         if (rdch && wrch)
 1269                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
 1270                         pdev = d->mixer_dev;
 1271                         p->mixers = 1; /* default: one mixer */
 1272                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
 1273                         p->left = p->right = 100;
 1274                         if (wrch)
 1275                                 CHN_UNLOCK(wrch);
 1276                         if (rdch)
 1277                                 CHN_UNLOCK(rdch);
 1278                         PCM_UNLOCK(d);
 1279                 }
 1280                 break;
 1281 
 1282         case AIOSTOP:
 1283                 if (*arg_i == AIOSYNC_PLAY && wrch) {
 1284                         CHN_LOCK(wrch);
 1285                         *arg_i = chn_abort(wrch);
 1286                         CHN_UNLOCK(wrch);
 1287                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
 1288                         CHN_LOCK(rdch);
 1289                         *arg_i = chn_abort(rdch);
 1290                         CHN_UNLOCK(rdch);
 1291                 } else {
 1292                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 1293                         *arg_i = 0;
 1294                 }
 1295                 break;
 1296 
 1297         case AIOSYNC:
 1298                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
 1299                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
 1300                 break;
 1301 #endif
 1302         /*
 1303          * here follow the standard ioctls (filio.h etc.)
 1304          */
 1305         case FIONREAD: /* get # bytes to read */
 1306                 if (rdch) {
 1307                         CHN_LOCK(rdch);
 1308 /*                      if (rdch && rdch->bufhard.dl)
 1309                                 while (chn_rdfeed(rdch) == 0);
 1310 */
 1311                         *arg_i = sndbuf_getready(rdch->bufsoft);
 1312                         CHN_UNLOCK(rdch);
 1313                 } else {
 1314                         *arg_i = 0;
 1315                         ret = EINVAL;
 1316                 }
 1317                 break;
 1318 
 1319         case FIOASYNC: /*set/clear async i/o */
 1320                 DEB( printf("FIOASYNC\n") ; )
 1321                 break;
 1322 
 1323         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
 1324         case FIONBIO: /* set/clear non-blocking i/o */
 1325                 if (rdch) {
 1326                         CHN_LOCK(rdch);
 1327                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1328                                 rdch->flags |= CHN_F_NBIO;
 1329                         else
 1330                                 rdch->flags &= ~CHN_F_NBIO;
 1331                         CHN_UNLOCK(rdch);
 1332                 }
 1333                 if (wrch) {
 1334                         CHN_LOCK(wrch);
 1335                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1336                                 wrch->flags |= CHN_F_NBIO;
 1337                         else
 1338                                 wrch->flags &= ~CHN_F_NBIO;
 1339                         CHN_UNLOCK(wrch);
 1340                 }
 1341                 break;
 1342 
 1343         /*
 1344          * Finally, here is the linux-compatible ioctl interface
 1345          */
 1346 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
 1347         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
 1348         case SNDCTL_DSP_GETBLKSIZE:
 1349                 chn = wrch ? wrch : rdch;
 1350                 if (chn) {
 1351                         CHN_LOCK(chn);
 1352                         *arg_i = sndbuf_getblksz(chn->bufsoft);
 1353                         CHN_UNLOCK(chn);
 1354                 } else {
 1355                         *arg_i = 0;
 1356                         ret = EINVAL;
 1357                 }
 1358                 break;
 1359 
 1360         case SNDCTL_DSP_SETBLKSIZE:
 1361                 RANGE(*arg_i, 16, 65536);
 1362                 PCM_ACQUIRE_QUICK(d);
 1363                 if (wrch) {
 1364                         CHN_LOCK(wrch);
 1365                         chn_setblocksize(wrch, 2, *arg_i);
 1366                         CHN_UNLOCK(wrch);
 1367                 }
 1368                 if (rdch) {
 1369                         CHN_LOCK(rdch);
 1370                         chn_setblocksize(rdch, 2, *arg_i);
 1371                         CHN_UNLOCK(rdch);
 1372                 }
 1373                 PCM_RELEASE_QUICK(d);
 1374                 break;
 1375 
 1376         case SNDCTL_DSP_RESET:
 1377                 DEB(printf("dsp reset\n"));
 1378                 if (wrch) {
 1379                         CHN_LOCK(wrch);
 1380                         chn_abort(wrch);
 1381                         chn_resetbuf(wrch);
 1382                         CHN_UNLOCK(wrch);
 1383                 }
 1384                 if (rdch) {
 1385                         CHN_LOCK(rdch);
 1386                         chn_abort(rdch);
 1387                         chn_resetbuf(rdch);
 1388                         CHN_UNLOCK(rdch);
 1389                 }
 1390                 break;
 1391 
 1392         case SNDCTL_DSP_SYNC:
 1393                 DEB(printf("dsp sync\n"));
 1394                 /* chn_sync may sleep */
 1395                 if (wrch) {
 1396                         CHN_LOCK(wrch);
 1397                         chn_sync(wrch, 0);
 1398                         CHN_UNLOCK(wrch);
 1399                 }
 1400                 break;
 1401 
 1402         case SNDCTL_DSP_SPEED:
 1403                 /* chn_setspeed may sleep */
 1404                 tmp = 0;
 1405                 PCM_ACQUIRE_QUICK(d);
 1406                 if (wrch) {
 1407                         CHN_LOCK(wrch);
 1408                         ret = chn_setspeed(wrch, *arg_i);
 1409                         tmp = wrch->speed;
 1410                         CHN_UNLOCK(wrch);
 1411                 }
 1412                 if (rdch && ret == 0) {
 1413                         CHN_LOCK(rdch);
 1414                         ret = chn_setspeed(rdch, *arg_i);
 1415                         if (tmp == 0)
 1416                                 tmp = rdch->speed;
 1417                         CHN_UNLOCK(rdch);
 1418                 }
 1419                 PCM_RELEASE_QUICK(d);
 1420                 *arg_i = tmp;
 1421                 break;
 1422 
 1423         case SOUND_PCM_READ_RATE:
 1424                 chn = wrch ? wrch : rdch;
 1425                 if (chn) {
 1426                         CHN_LOCK(chn);
 1427                         *arg_i = chn->speed;
 1428                         CHN_UNLOCK(chn);
 1429                 } else {
 1430                         *arg_i = 0;
 1431                         ret = EINVAL;
 1432                 }
 1433                 break;
 1434 
 1435         case SNDCTL_DSP_STEREO:
 1436                 tmp = -1;
 1437                 *arg_i = (*arg_i)? 2 : 1;
 1438                 PCM_ACQUIRE_QUICK(d);
 1439                 if (wrch) {
 1440                         CHN_LOCK(wrch);
 1441                         ret = chn_setformat(wrch,
 1442                             SND_FORMAT(wrch->format, *arg_i, 0));
 1443                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
 1444                         CHN_UNLOCK(wrch);
 1445                 }
 1446                 if (rdch && ret == 0) {
 1447                         CHN_LOCK(rdch);
 1448                         ret = chn_setformat(rdch,
 1449                             SND_FORMAT(rdch->format, *arg_i, 0));
 1450                         if (tmp == -1)
 1451                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
 1452                         CHN_UNLOCK(rdch);
 1453                 }
 1454                 PCM_RELEASE_QUICK(d);
 1455                 *arg_i = tmp;
 1456                 break;
 1457 
 1458         case SOUND_PCM_WRITE_CHANNELS:
 1459 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
 1460                 if (*arg_i < 0) {
 1461                         *arg_i = 0;
 1462                         ret = EINVAL;
 1463                         break;
 1464                 }
 1465                 if (*arg_i != 0) {
 1466                         struct pcmchan_matrix *m;
 1467                         uint32_t ext;
 1468 
 1469                         tmp = 0;
 1470                         if (*arg_i > SND_CHN_MAX)
 1471                                 *arg_i = SND_CHN_MAX;
 1472 
 1473                         m = feeder_matrix_default_channel_map(*arg_i);
 1474                         if (m != NULL)
 1475                                 ext = m->ext;
 1476                         else
 1477                                 ext = 0;
 1478 
 1479                         PCM_ACQUIRE_QUICK(d);
 1480                         if (wrch) {
 1481                                 CHN_LOCK(wrch);
 1482                                 ret = chn_setformat(wrch,
 1483                                     SND_FORMAT(wrch->format, *arg_i, ext));
 1484                                 tmp = AFMT_CHANNEL(wrch->format);
 1485                                 CHN_UNLOCK(wrch);
 1486                         }
 1487                         if (rdch && ret == 0) {
 1488                                 CHN_LOCK(rdch);
 1489                                 ret = chn_setformat(rdch,
 1490                                     SND_FORMAT(rdch->format, *arg_i, ext));
 1491                                 if (tmp == 0)
 1492                                         tmp = AFMT_CHANNEL(rdch->format);
 1493                                 CHN_UNLOCK(rdch);
 1494                         }
 1495                         PCM_RELEASE_QUICK(d);
 1496                         *arg_i = tmp;
 1497                 } else {
 1498                         chn = wrch ? wrch : rdch;
 1499                         CHN_LOCK(chn);
 1500                         *arg_i = AFMT_CHANNEL(chn->format);
 1501                         CHN_UNLOCK(chn);
 1502                 }
 1503                 break;
 1504 
 1505         case SOUND_PCM_READ_CHANNELS:
 1506                 chn = wrch ? wrch : rdch;
 1507                 if (chn) {
 1508                         CHN_LOCK(chn);
 1509                         *arg_i = AFMT_CHANNEL(chn->format);
 1510                         CHN_UNLOCK(chn);
 1511                 } else {
 1512                         *arg_i = 0;
 1513                         ret = EINVAL;
 1514                 }
 1515                 break;
 1516 
 1517         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
 1518                 chn = wrch ? wrch : rdch;
 1519                 if (chn) {
 1520                         CHN_LOCK(chn);
 1521                         *arg_i = chn_getformats(chn);
 1522                         CHN_UNLOCK(chn);
 1523                 } else {
 1524                         *arg_i = 0;
 1525                         ret = EINVAL;
 1526                 }
 1527                 break;
 1528 
 1529         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
 1530                 if (*arg_i != AFMT_QUERY) {
 1531                         tmp = 0;
 1532                         PCM_ACQUIRE_QUICK(d);
 1533                         if (wrch) {
 1534                                 CHN_LOCK(wrch);
 1535                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
 1536                                     AFMT_CHANNEL(wrch->format),
 1537                                     AFMT_EXTCHANNEL(wrch->format)));
 1538                                 tmp = wrch->format;
 1539                                 CHN_UNLOCK(wrch);
 1540                         }
 1541                         if (rdch && ret == 0) {
 1542                                 CHN_LOCK(rdch);
 1543                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
 1544                                     AFMT_CHANNEL(rdch->format),
 1545                                     AFMT_EXTCHANNEL(rdch->format)));
 1546                                 if (tmp == 0)
 1547                                         tmp = rdch->format;
 1548                                 CHN_UNLOCK(rdch);
 1549                         }
 1550                         PCM_RELEASE_QUICK(d);
 1551                         *arg_i = AFMT_ENCODING(tmp);
 1552                 } else {
 1553                         chn = wrch ? wrch : rdch;
 1554                         CHN_LOCK(chn);
 1555                         *arg_i = AFMT_ENCODING(chn->format);
 1556                         CHN_UNLOCK(chn);
 1557                 }
 1558                 break;
 1559 
 1560         case SNDCTL_DSP_SETFRAGMENT:
 1561                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
 1562                 {
 1563                         uint32_t fragln = (*arg_i) & 0x0000ffff;
 1564                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
 1565                         uint32_t fragsz;
 1566                         uint32_t r_maxfrags, r_fragsz;
 1567 
 1568                         RANGE(fragln, 4, 16);
 1569                         fragsz = 1 << fragln;
 1570 
 1571                         if (maxfrags == 0)
 1572                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1573                         if (maxfrags < 2)
 1574                                 maxfrags = 2;
 1575                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
 1576                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1577 
 1578                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
 1579                         PCM_ACQUIRE_QUICK(d);
 1580                         if (rdch) {
 1581                                 CHN_LOCK(rdch);
 1582                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
 1583                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
 1584                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
 1585                                 CHN_UNLOCK(rdch);
 1586                         } else {
 1587                                 r_maxfrags = maxfrags;
 1588                                 r_fragsz = fragsz;
 1589                         }
 1590                         if (wrch && ret == 0) {
 1591                                 CHN_LOCK(wrch);
 1592                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
 1593                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
 1594                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
 1595                                 CHN_UNLOCK(wrch);
 1596                         } else { /* use whatever came from the read channel */
 1597                                 maxfrags = r_maxfrags;
 1598                                 fragsz = r_fragsz;
 1599                         }
 1600                         PCM_RELEASE_QUICK(d);
 1601 
 1602                         fragln = 0;
 1603                         while (fragsz > 1) {
 1604                                 fragln++;
 1605                                 fragsz >>= 1;
 1606                         }
 1607                         *arg_i = (maxfrags << 16) | fragln;
 1608                 }
 1609                 break;
 1610 
 1611         case SNDCTL_DSP_GETISPACE:
 1612                 /* return the size of data available in the input queue */
 1613                 {
 1614                         audio_buf_info *a = (audio_buf_info *)arg;
 1615                         if (rdch) {
 1616                                 struct snd_dbuf *bs = rdch->bufsoft;
 1617 
 1618                                 CHN_LOCK(rdch);
 1619                                 a->bytes = sndbuf_getready(bs);
 1620                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1621                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1622                                 a->fragsize = sndbuf_getblksz(bs);
 1623                                 CHN_UNLOCK(rdch);
 1624                         } else
 1625                                 ret = EINVAL;
 1626                 }
 1627                 break;
 1628 
 1629         case SNDCTL_DSP_GETOSPACE:
 1630                 /* return space available in the output queue */
 1631                 {
 1632                         audio_buf_info *a = (audio_buf_info *)arg;
 1633                         if (wrch) {
 1634                                 struct snd_dbuf *bs = wrch->bufsoft;
 1635 
 1636                                 CHN_LOCK(wrch);
 1637                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1638                                 a->bytes = sndbuf_getfree(bs);
 1639                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1640                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1641                                 a->fragsize = sndbuf_getblksz(bs);
 1642                                 CHN_UNLOCK(wrch);
 1643                         } else
 1644                                 ret = EINVAL;
 1645                 }
 1646                 break;
 1647 
 1648         case SNDCTL_DSP_GETIPTR:
 1649                 {
 1650                         count_info *a = (count_info *)arg;
 1651                         if (rdch) {
 1652                                 struct snd_dbuf *bs = rdch->bufsoft;
 1653 
 1654                                 CHN_LOCK(rdch);
 1655                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
 1656                                 a->bytes = sndbuf_gettotal(bs);
 1657                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
 1658                                 a->ptr = sndbuf_getreadyptr(bs);
 1659                                 rdch->blocks = sndbuf_getblocks(bs);
 1660                                 CHN_UNLOCK(rdch);
 1661                         } else
 1662                                 ret = EINVAL;
 1663                 }
 1664                 break;
 1665 
 1666         case SNDCTL_DSP_GETOPTR:
 1667                 {
 1668                         count_info *a = (count_info *)arg;
 1669                         if (wrch) {
 1670                                 struct snd_dbuf *bs = wrch->bufsoft;
 1671 
 1672                                 CHN_LOCK(wrch);
 1673                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1674                                 a->bytes = sndbuf_gettotal(bs);
 1675                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
 1676                                 a->ptr = sndbuf_getreadyptr(bs);
 1677                                 wrch->blocks = sndbuf_getblocks(bs);
 1678                                 CHN_UNLOCK(wrch);
 1679                         } else
 1680                                 ret = EINVAL;
 1681                 }
 1682                 break;
 1683 
 1684         case SNDCTL_DSP_GETCAPS:
 1685                 PCM_LOCK(d);
 1686                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
 1687                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1688                         *arg_i |= PCM_CAP_DUPLEX;
 1689                 PCM_UNLOCK(d);
 1690                 break;
 1691 
 1692         case SOUND_PCM_READ_BITS:
 1693                 chn = wrch ? wrch : rdch;
 1694                 if (chn) {
 1695                         CHN_LOCK(chn);
 1696                         if (chn->format & AFMT_8BIT)
 1697                                 *arg_i = 8;
 1698                         else if (chn->format & AFMT_16BIT)
 1699                                 *arg_i = 16;
 1700                         else if (chn->format & AFMT_24BIT)
 1701                                 *arg_i = 24;
 1702                         else if (chn->format & AFMT_32BIT)
 1703                                 *arg_i = 32;
 1704                         else
 1705                                 ret = EINVAL;
 1706                         CHN_UNLOCK(chn);
 1707                 } else {
 1708                         *arg_i = 0;
 1709                         ret = EINVAL;
 1710                 }
 1711                 break;
 1712 
 1713         case SNDCTL_DSP_SETTRIGGER:
 1714                 if (rdch) {
 1715                         CHN_LOCK(rdch);
 1716                         rdch->flags &= ~CHN_F_NOTRIGGER;
 1717                         if (*arg_i & PCM_ENABLE_INPUT)
 1718                                 chn_start(rdch, 1);
 1719                         else {
 1720                                 chn_abort(rdch);
 1721                                 chn_resetbuf(rdch);
 1722                                 rdch->flags |= CHN_F_NOTRIGGER;
 1723                         }
 1724                         CHN_UNLOCK(rdch);
 1725                 }
 1726                 if (wrch) {
 1727                         CHN_LOCK(wrch);
 1728                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1729                         if (*arg_i & PCM_ENABLE_OUTPUT)
 1730                                 chn_start(wrch, 1);
 1731                         else {
 1732                                 chn_abort(wrch);
 1733                                 chn_resetbuf(wrch);
 1734                                 wrch->flags |= CHN_F_NOTRIGGER;
 1735                         }
 1736                         CHN_UNLOCK(wrch);
 1737                 }
 1738                 break;
 1739 
 1740         case SNDCTL_DSP_GETTRIGGER:
 1741                 *arg_i = 0;
 1742                 if (wrch) {
 1743                         CHN_LOCK(wrch);
 1744                         if (wrch->flags & CHN_F_TRIGGERED)
 1745                                 *arg_i |= PCM_ENABLE_OUTPUT;
 1746                         CHN_UNLOCK(wrch);
 1747                 }
 1748                 if (rdch) {
 1749                         CHN_LOCK(rdch);
 1750                         if (rdch->flags & CHN_F_TRIGGERED)
 1751                                 *arg_i |= PCM_ENABLE_INPUT;
 1752                         CHN_UNLOCK(rdch);
 1753                 }
 1754                 break;
 1755 
 1756         case SNDCTL_DSP_GETODELAY:
 1757                 if (wrch) {
 1758                         struct snd_dbuf *bs = wrch->bufsoft;
 1759 
 1760                         CHN_LOCK(wrch);
 1761                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1762                         *arg_i = sndbuf_getready(bs);
 1763                         CHN_UNLOCK(wrch);
 1764                 } else
 1765                         ret = EINVAL;
 1766                 break;
 1767 
 1768         case SNDCTL_DSP_POST:
 1769                 if (wrch) {
 1770                         CHN_LOCK(wrch);
 1771                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1772                         chn_start(wrch, 1);
 1773                         CHN_UNLOCK(wrch);
 1774                 }
 1775                 break;
 1776 
 1777         case SNDCTL_DSP_SETDUPLEX:
 1778                 /*
 1779                  * switch to full-duplex mode if card is in half-duplex
 1780                  * mode and is able to work in full-duplex mode
 1781                  */
 1782                 PCM_LOCK(d);
 1783                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1784                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
 1785                 PCM_UNLOCK(d);
 1786                 break;
 1787 
 1788         /*
 1789          * The following four ioctls are simple wrappers around mixer_ioctl
 1790          * with no further processing.  xcmd is short for "translated
 1791          * command".
 1792          */
 1793         case SNDCTL_DSP_GETRECVOL:
 1794                 if (xcmd == 0) {
 1795                         xcmd = SOUND_MIXER_READ_RECLEV;
 1796                         chn = rdch;
 1797                 }
 1798                 /* FALLTHROUGH */
 1799         case SNDCTL_DSP_SETRECVOL:
 1800                 if (xcmd == 0) {
 1801                         xcmd = SOUND_MIXER_WRITE_RECLEV;
 1802                         chn = rdch;
 1803                 }
 1804                 /* FALLTHROUGH */
 1805         case SNDCTL_DSP_GETPLAYVOL:
 1806                 if (xcmd == 0) {
 1807                         xcmd = SOUND_MIXER_READ_PCM;
 1808                         chn = wrch;
 1809                 }
 1810                 /* FALLTHROUGH */
 1811         case SNDCTL_DSP_SETPLAYVOL:
 1812                 if (xcmd == 0) {
 1813                         xcmd = SOUND_MIXER_WRITE_PCM;
 1814                         chn = wrch;
 1815                 }
 1816 
 1817                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
 1818                 if (ret != -1) {
 1819                         PCM_GIANT_EXIT(d);
 1820                         return (ret);
 1821                 }
 1822 
 1823                 if (d->mixer_dev != NULL) {
 1824                         PCM_ACQUIRE_QUICK(d);
 1825                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
 1826                             MIXER_CMD_DIRECT);
 1827                         PCM_RELEASE_QUICK(d);
 1828                 } else
 1829                         ret = ENOTSUP;
 1830 
 1831                 break;
 1832 
 1833         case SNDCTL_DSP_GET_RECSRC_NAMES:
 1834         case SNDCTL_DSP_GET_RECSRC:
 1835         case SNDCTL_DSP_SET_RECSRC:
 1836                 if (d->mixer_dev != NULL) {
 1837                         PCM_ACQUIRE_QUICK(d);
 1838                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1839                             MIXER_CMD_DIRECT);
 1840                         PCM_RELEASE_QUICK(d);
 1841                 } else
 1842                         ret = ENOTSUP;
 1843                 break;
 1844 
 1845         /*
 1846          * The following 3 ioctls aren't very useful at the moment.  For
 1847          * now, only a single channel is associated with a cdev (/dev/dspN
 1848          * instance), so there's only a single output routing to use (i.e.,
 1849          * the wrch bound to this cdev).
 1850          */
 1851         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
 1852                 {
 1853                         oss_mixer_enuminfo *ei;
 1854                         ei = (oss_mixer_enuminfo *)arg;
 1855                         ei->dev = 0;
 1856                         ei->ctrl = 0;
 1857                         ei->version = 0; /* static for now */
 1858                         ei->strindex[0] = 0;
 1859 
 1860                         if (wrch != NULL) {
 1861                                 ei->nvalues = 1;
 1862                                 strlcpy(ei->strings, wrch->name,
 1863                                         sizeof(ei->strings));
 1864                         } else {
 1865                                 ei->nvalues = 0;
 1866                                 ei->strings[0] = '\0';
 1867                         }
 1868                 }
 1869                 break;
 1870         case SNDCTL_DSP_GET_PLAYTGT:
 1871         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
 1872                 /*
 1873                  * Re: SET_PLAYTGT
 1874                  *   OSSv4: "The value that was accepted by the device will
 1875                  *   be returned back in the variable pointed by the
 1876                  *   argument."
 1877                  */
 1878                 if (wrch != NULL)
 1879                         *arg_i = 0;
 1880                 else
 1881                         ret = EINVAL;
 1882                 break;
 1883 
 1884         case SNDCTL_DSP_SILENCE:
 1885         /*
 1886          * Flush the software (pre-feed) buffer, but try to minimize playback
 1887          * interruption.  (I.e., record unplayed samples with intent to
 1888          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
 1889          * functionality.
 1890          */
 1891                 if (wrch == NULL)
 1892                         ret = EINVAL;
 1893                 else {
 1894                         struct snd_dbuf *bs;
 1895                         CHN_LOCK(wrch);
 1896                         while (wrch->inprog != 0)
 1897                                 cv_wait(&wrch->cv, wrch->lock);
 1898                         bs = wrch->bufsoft;
 1899                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
 1900                                 bs->sl = sndbuf_getready(bs);
 1901                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
 1902                                 sndbuf_fillsilence(bs);
 1903                                 chn_start(wrch, 0);
 1904                         }
 1905                         CHN_UNLOCK(wrch);
 1906                 }
 1907                 break;
 1908 
 1909         case SNDCTL_DSP_SKIP:
 1910         /*
 1911          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
 1912          * playback buffer by moving the current write position immediately
 1913          * before the point where the device is currently reading the samples."
 1914          */
 1915                 if (wrch == NULL)
 1916                         ret = EINVAL;
 1917                 else {
 1918                         struct snd_dbuf *bs;
 1919                         CHN_LOCK(wrch);
 1920                         while (wrch->inprog != 0)
 1921                                 cv_wait(&wrch->cv, wrch->lock);
 1922                         bs = wrch->bufsoft;
 1923                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
 1924                                 sndbuf_softreset(bs);
 1925                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
 1926                                 bs->sl = 0;
 1927                                 chn_start(wrch, 0);
 1928                         }
 1929                         CHN_UNLOCK(wrch);
 1930                 }
 1931                 break;
 1932 
 1933         case SNDCTL_DSP_CURRENT_OPTR:
 1934         case SNDCTL_DSP_CURRENT_IPTR:
 1935         /**
 1936          * @note Changing formats resets the buffer counters, which differs
 1937          *       from the 4Front drivers.  However, I don't expect this to be
 1938          *       much of a problem.
 1939          *
 1940          * @note In a test where @c CURRENT_OPTR is called immediately after write
 1941          *       returns, this driver is about 32K samples behind whereas
 1942          *       4Front's is about 8K samples behind.  Should determine source
 1943          *       of discrepancy, even if only out of curiosity.
 1944          *
 1945          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
 1946          */
 1947                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
 1948                 if (chn == NULL) 
 1949                         ret = EINVAL;
 1950                 else {
 1951                         struct snd_dbuf *bs;
 1952                         /* int tmp; */
 1953 
 1954                         oss_count_t *oc = (oss_count_t *)arg;
 1955 
 1956                         CHN_LOCK(chn);
 1957                         bs = chn->bufsoft;
 1958 #if 0
 1959                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
 1960                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
 1961                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
 1962 #else
 1963                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
 1964                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
 1965 #endif
 1966                         CHN_UNLOCK(chn);
 1967                 }
 1968                 break;
 1969 
 1970         case SNDCTL_DSP_HALT_OUTPUT:
 1971         case SNDCTL_DSP_HALT_INPUT:
 1972                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
 1973                 if (chn == NULL)
 1974                         ret = EINVAL;
 1975                 else {
 1976                         CHN_LOCK(chn);
 1977                         chn_abort(chn);
 1978                         CHN_UNLOCK(chn);
 1979                 }
 1980                 break;
 1981 
 1982         case SNDCTL_DSP_LOW_WATER:
 1983         /*
 1984          * Set the number of bytes required to attract attention by
 1985          * select/poll.
 1986          */
 1987                 if (wrch != NULL) {
 1988                         CHN_LOCK(wrch);
 1989                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
 1990                         CHN_UNLOCK(wrch);
 1991                 }
 1992                 if (rdch != NULL) {
 1993                         CHN_LOCK(rdch);
 1994                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
 1995                         CHN_UNLOCK(rdch);
 1996                 }
 1997                 break;
 1998 
 1999         case SNDCTL_DSP_GETERROR:
 2000         /*
 2001          * OSSv4 docs:  "All errors and counters will automatically be
 2002          * cleared to zeroes after the call so each call will return only
 2003          * the errors that occurred after the previous invocation. ... The
 2004          * play_underruns and rec_overrun fields are the only usefull fields
 2005          * returned by OSS 4.0."
 2006          */
 2007                 {
 2008                         audio_errinfo *ei = (audio_errinfo *)arg;
 2009 
 2010                         bzero((void *)ei, sizeof(*ei));
 2011 
 2012                         if (wrch != NULL) {
 2013                                 CHN_LOCK(wrch);
 2014                                 ei->play_underruns = wrch->xruns;
 2015                                 wrch->xruns = 0;
 2016                                 CHN_UNLOCK(wrch);
 2017                         }
 2018                         if (rdch != NULL) {
 2019                                 CHN_LOCK(rdch);
 2020                                 ei->rec_overruns = rdch->xruns;
 2021                                 rdch->xruns = 0;
 2022                                 CHN_UNLOCK(rdch);
 2023                         }
 2024                 }
 2025                 break;
 2026 
 2027         case SNDCTL_DSP_SYNCGROUP:
 2028                 PCM_ACQUIRE_QUICK(d);
 2029                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
 2030                 PCM_RELEASE_QUICK(d);
 2031                 break;
 2032 
 2033         case SNDCTL_DSP_SYNCSTART:
 2034                 PCM_ACQUIRE_QUICK(d);
 2035                 ret = dsp_oss_syncstart(*arg_i);
 2036                 PCM_RELEASE_QUICK(d);
 2037                 break;
 2038 
 2039         case SNDCTL_DSP_POLICY:
 2040                 PCM_ACQUIRE_QUICK(d);
 2041                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
 2042                 PCM_RELEASE_QUICK(d);
 2043                 break;
 2044 
 2045         case SNDCTL_DSP_COOKEDMODE:
 2046                 PCM_ACQUIRE_QUICK(d);
 2047                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
 2048                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
 2049                 PCM_RELEASE_QUICK(d);
 2050                 break;
 2051         case SNDCTL_DSP_GET_CHNORDER:
 2052                 PCM_ACQUIRE_QUICK(d);
 2053                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
 2054                 PCM_RELEASE_QUICK(d);
 2055                 break;
 2056         case SNDCTL_DSP_SET_CHNORDER:
 2057                 PCM_ACQUIRE_QUICK(d);
 2058                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
 2059                 PCM_RELEASE_QUICK(d);
 2060                 break;
 2061         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
 2062                 PCM_ACQUIRE_QUICK(d);
 2063                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
 2064                 PCM_RELEASE_QUICK(d);
 2065                 break;
 2066         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
 2067                 ret = EINVAL;
 2068                 break;
 2069 #ifdef  OSSV4_EXPERIMENT
 2070         /*
 2071          * XXX The following ioctls are not yet supported and just return
 2072          * EINVAL.
 2073          */
 2074         case SNDCTL_DSP_GETOPEAKS:
 2075         case SNDCTL_DSP_GETIPEAKS:
 2076                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
 2077                 if (chn == NULL)
 2078                         ret = EINVAL;
 2079                 else {
 2080                         oss_peaks_t *op = (oss_peaks_t *)arg;
 2081                         int lpeak, rpeak;
 2082 
 2083                         CHN_LOCK(chn);
 2084                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
 2085                         if (ret == -1)
 2086                                 ret = EINVAL;
 2087                         else {
 2088                                 (*op)[0] = lpeak;
 2089                                 (*op)[1] = rpeak;
 2090                         }
 2091                         CHN_UNLOCK(chn);
 2092                 }
 2093                 break;
 2094 
 2095         /*
 2096          * XXX Once implemented, revisit this for proper cv protection
 2097          *     (if necessary).
 2098          */
 2099         case SNDCTL_GETLABEL:
 2100                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
 2101                 break;
 2102         case SNDCTL_SETLABEL:
 2103                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
 2104                 break;
 2105         case SNDCTL_GETSONG:
 2106                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
 2107                 break;
 2108         case SNDCTL_SETSONG:
 2109                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
 2110                 break;
 2111         case SNDCTL_SETNAME:
 2112                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
 2113                 break;
 2114 #if 0
 2115         /**
 2116          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
 2117          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
 2118          * 4Front Technologies.
 2119          */
 2120         case SNDCTL_DSP_READCTL:
 2121         case SNDCTL_DSP_WRITECTL:
 2122                 ret = EINVAL;
 2123                 break;
 2124 #endif  /* !0 (explicitly omitted ioctls) */
 2125 
 2126 #endif  /* !OSSV4_EXPERIMENT */
 2127         case SNDCTL_DSP_MAPINBUF:
 2128         case SNDCTL_DSP_MAPOUTBUF:
 2129         case SNDCTL_DSP_SETSYNCRO:
 2130                 /* undocumented */
 2131 
 2132         case SNDCTL_DSP_SUBDIVIDE:
 2133         case SOUND_PCM_WRITE_FILTER:
 2134         case SOUND_PCM_READ_FILTER:
 2135                 /* dunno what these do, don't sound important */
 2136 
 2137         default:
 2138                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
 2139                 ret = EINVAL;
 2140                 break;
 2141         }
 2142 
 2143         PCM_GIANT_LEAVE(d);
 2144 
 2145         return (ret);
 2146 }
 2147 
 2148 static int
 2149 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
 2150 {
 2151         struct snddev_info *d;
 2152         struct pcm_channel *wrch, *rdch;
 2153         int ret, e;
 2154 
 2155         d = dsp_get_info(i_dev);
 2156         if (!DSP_REGISTERED(d, i_dev))
 2157                 return (EBADF);
 2158 
 2159         PCM_GIANT_ENTER(d);
 2160 
 2161         wrch = NULL;
 2162         rdch = NULL;
 2163         ret = 0;
 2164 
 2165         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2166 
 2167         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
 2168                 e = (events & (POLLOUT | POLLWRNORM));
 2169                 if (e)
 2170                         ret |= chn_poll(wrch, e, td);
 2171         }
 2172 
 2173         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
 2174                 e = (events & (POLLIN | POLLRDNORM));
 2175                 if (e)
 2176                         ret |= chn_poll(rdch, e, td);
 2177         }
 2178 
 2179         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2180 
 2181         PCM_GIANT_LEAVE(d);
 2182 
 2183         return (ret);
 2184 }
 2185 
 2186 static int
 2187 dsp_mmap(struct cdev *i_dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
 2188 {
 2189         struct snddev_info *d;
 2190         struct pcm_channel *wrch, *rdch, *c;
 2191 
 2192         /*
 2193          * Reject PROT_EXEC by default. It just doesn't makes sense.
 2194          * Unfortunately, we have to give up this one due to linux_mmap
 2195          * changes.
 2196          *
 2197          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
 2198          *
 2199          */
 2200 #ifdef SV_ABI_LINUX
 2201         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
 2202             (dsp_mmap_allow_prot_exec == 0 &&
 2203             SV_CURPROC_ABI() != SV_ABI_LINUX)))
 2204 #else
 2205         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
 2206 #endif
 2207                 return (-1);
 2208 
 2209         d = dsp_get_info(i_dev);
 2210         if (!DSP_REGISTERED(d, i_dev))
 2211                 return (-1);
 2212 
 2213         PCM_GIANT_ENTER(d);
 2214 
 2215         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2216 
 2217         /*
 2218          * XXX The linux api uses the nprot to select read/write buffer
 2219          *     our vm system doesn't allow this, so force write buffer.
 2220          *
 2221          *     This is just a quack to fool full-duplex mmap, so that at
 2222          *     least playback _or_ recording works. If you really got the
 2223          *     urge to make _both_ work at the same time, avoid O_RDWR.
 2224          *     Just open each direction separately and mmap() it.
 2225          *
 2226          *     Failure is not an option due to INVARIANTS check within
 2227          *     device_pager.c, which means, we have to give up one over
 2228          *     another.
 2229          */
 2230         c = (wrch != NULL) ? wrch : rdch;
 2231 
 2232         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
 2233             offset >= sndbuf_getsize(c->bufsoft) ||
 2234             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
 2235             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
 2236                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2237                 PCM_GIANT_EXIT(d);
 2238                 return (-1);
 2239         }
 2240 
 2241         /* XXX full-duplex quack. */
 2242         if (wrch != NULL)
 2243                 wrch->flags |= CHN_F_MMAP;
 2244         if (rdch != NULL)
 2245                 rdch->flags |= CHN_F_MMAP;
 2246 
 2247         *paddr = vtophys(sndbuf_getbufofs(c->bufsoft, offset));
 2248         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2249 
 2250         PCM_GIANT_LEAVE(d);
 2251 
 2252         return (0);
 2253 }
 2254 
 2255 /* So much for dev_stdclone() */
 2256 static int
 2257 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
 2258 {
 2259         size_t len;
 2260 
 2261         len = strlen(namep);
 2262 
 2263         if (bcmp(name, namep, len) != 0)
 2264                 return (ENODEV);
 2265 
 2266         name += len;
 2267 
 2268         if (isdigit(*name) == 0)
 2269                 return (ENODEV);
 2270 
 2271         len = strlen(sep);
 2272 
 2273         if (*name == '' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
 2274                 return (ENODEV);
 2275 
 2276         for (*u = 0; isdigit(*name) != 0; name++) {
 2277                 *u *= 10;
 2278                 *u += *name - '';
 2279                 if (*u > dsp_umax)
 2280                         return (ENODEV);
 2281         }
 2282 
 2283         if (*name == '\0')
 2284                 return ((use_sep == 0) ? 0 : ENODEV);
 2285 
 2286         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
 2287                 return (ENODEV);
 2288 
 2289         name += len;
 2290 
 2291         if (*name == '' && name[1] != '\0')
 2292                 return (ENODEV);
 2293 
 2294         for (*c = 0; isdigit(*name) != 0; name++) {
 2295                 *c *= 10;
 2296                 *c += *name - '';
 2297                 if (*c > dsp_cmax)
 2298                         return (ENODEV);
 2299         }
 2300 
 2301         if (*name != '\0')
 2302                 return (ENODEV);
 2303 
 2304         return (0);
 2305 }
 2306 
 2307 static void
 2308 dsp_clone(void *arg,
 2309 #if __FreeBSD_version >= 600034
 2310     struct ucred *cred,
 2311 #endif
 2312     char *name, int namelen, struct cdev **dev)
 2313 {
 2314         struct snddev_info *d;
 2315         struct snd_clone_entry *ce;
 2316         struct pcm_channel *c;
 2317         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
 2318         char *devname, *devcmp, *devsep;
 2319 
 2320         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
 2321 
 2322         if (*dev != NULL)
 2323                 return;
 2324 
 2325         unit = -1;
 2326         cunit = -1;
 2327         devtype = -1;
 2328         devhw = 0;
 2329         devcmax = -1;
 2330         tumax = -1;
 2331         devname = NULL;
 2332         devsep = NULL;
 2333 
 2334         for (i = 0; unit == -1 &&
 2335             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2336                 devtype = dsp_cdevs[i].type;
 2337                 devcmp = dsp_cdevs[i].name;
 2338                 devsep = dsp_cdevs[i].sep;
 2339                 devname = dsp_cdevs[i].alias;
 2340                 if (devname == NULL)
 2341                         devname = devcmp;
 2342                 devhw = dsp_cdevs[i].hw;
 2343                 devcmax = dsp_cdevs[i].max - 1;
 2344                 if (strcmp(name, devcmp) == 0)
 2345                         unit = snd_unit;
 2346                 else if (dsp_stdclone(name, devcmp, devsep,
 2347                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
 2348                         unit = -1;
 2349                         cunit = -1;
 2350                 }
 2351         }
 2352 
 2353         d = devclass_get_softc(pcm_devclass, unit);
 2354         if (!PCM_REGISTERED(d) || d->clones == NULL)
 2355                 return;
 2356 
 2357         /* XXX Need Giant magic entry ??? */
 2358 
 2359         PCM_LOCK(d);
 2360         if (snd_clone_disabled(d->clones)) {
 2361                 PCM_UNLOCK(d);
 2362                 return;
 2363         }
 2364 
 2365         PCM_WAIT(d);
 2366         PCM_ACQUIRE(d);
 2367         PCM_UNLOCK(d);
 2368 
 2369         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
 2370 
 2371         if (devhw != 0) {
 2372                 KASSERT(devcmax <= dsp_cmax,
 2373                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
 2374                 if (cunit > devcmax) {
 2375                         PCM_RELEASE_QUICK(d);
 2376                         return;
 2377                 }
 2378                 udcmask |= snd_c2unit(cunit);
 2379                 CHN_FOREACH(c, d, channels.pcm) {
 2380                         CHN_LOCK(c);
 2381                         if (c->unit != udcmask) {
 2382                                 CHN_UNLOCK(c);
 2383                                 continue;
 2384                         }
 2385                         CHN_UNLOCK(c);
 2386                         udcmask &= ~snd_c2unit(cunit);
 2387                         /*
 2388                          * Temporarily increase clone maxunit to overcome
 2389                          * vchan flexibility.
 2390                          *
 2391                          * # sysctl dev.pcm.0.play.vchans=256
 2392                          * dev.pcm.0.play.vchans: 1 -> 256
 2393                          * # cat /dev/zero > /dev/dsp0.vp255 &
 2394                          * [1] 17296
 2395                          * # sysctl dev.pcm.0.play.vchans=0
 2396                          * dev.pcm.0.play.vchans: 256 -> 1
 2397                          * # fg
 2398                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
 2399                          * ^C
 2400                          * # cat /dev/zero > /dev/dsp0.vp255
 2401                          * zsh: operation not supported: /dev/dsp0.vp255
 2402                          */
 2403                         tumax = snd_clone_getmaxunit(d->clones);
 2404                         if (cunit > tumax)
 2405                                 snd_clone_setmaxunit(d->clones, cunit);
 2406                         else
 2407                                 tumax = -1;
 2408                         goto dsp_clone_alloc;
 2409                 }
 2410                 /*
 2411                  * Ok, so we're requesting unallocated vchan, but still
 2412                  * within maximum vchan limit.
 2413                  */
 2414                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
 2415                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
 2416                     cunit < snd_maxautovchans) {
 2417                         udcmask &= ~snd_c2unit(cunit);
 2418                         tumax = snd_clone_getmaxunit(d->clones);
 2419                         if (cunit > tumax)
 2420                                 snd_clone_setmaxunit(d->clones, cunit);
 2421                         else
 2422                                 tumax = -1;
 2423                         goto dsp_clone_alloc;
 2424                 }
 2425                 PCM_RELEASE_QUICK(d);
 2426                 return;
 2427         }
 2428 
 2429 dsp_clone_alloc:
 2430         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
 2431         if (tumax != -1)
 2432                 snd_clone_setmaxunit(d->clones, tumax);
 2433         if (ce != NULL) {
 2434                 udcmask |= snd_c2unit(cunit);
 2435                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
 2436                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
 2437                     devname, unit, devsep, cunit);
 2438                 snd_clone_register(ce, *dev);
 2439         }
 2440 
 2441         PCM_RELEASE_QUICK(d);
 2442 
 2443         if (*dev != NULL)
 2444                 dev_ref(*dev);
 2445 }
 2446 
 2447 static void
 2448 dsp_sysinit(void *p)
 2449 {
 2450         if (dsp_ehtag != NULL)
 2451                 return;
 2452         /* initialize unit numbering */
 2453         snd_unit_init();
 2454         dsp_umax = PCMMAXUNIT;
 2455         dsp_cmax = PCMMAXCHAN;
 2456         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
 2457 }
 2458 
 2459 static void
 2460 dsp_sysuninit(void *p)
 2461 {
 2462         if (dsp_ehtag == NULL)
 2463                 return;
 2464         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
 2465         dsp_ehtag = NULL;
 2466 }
 2467 
 2468 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
 2469 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
 2470 
 2471 char *
 2472 dsp_unit2name(char *buf, size_t len, int unit)
 2473 {
 2474         int i, dtype;
 2475 
 2476         KASSERT(buf != NULL && len != 0,
 2477             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
 2478 
 2479         dtype = snd_unit2d(unit);
 2480 
 2481         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2482                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 2483                         continue;
 2484                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
 2485                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
 2486                 return (buf);
 2487         }
 2488 
 2489         return (NULL);
 2490 }
 2491 
 2492 /**
 2493  * @brief Handler for SNDCTL_AUDIOINFO.
 2494  *
 2495  * Gathers information about the audio device specified in ai->dev.  If
 2496  * ai->dev == -1, then this function gathers information about the current
 2497  * device.  If the call comes in on a non-audio device and ai->dev == -1,
 2498  * return EINVAL.
 2499  *
 2500  * This routine is supposed to go practically straight to the hardware,
 2501  * getting capabilities directly from the sound card driver, side-stepping
 2502  * the intermediate channel interface.
 2503  *
 2504  * Note, however, that the usefulness of this command is significantly
 2505  * decreased when requesting info about any device other than the one serving
 2506  * the request. While each snddev_channel refers to a specific device node,
 2507  * the converse is *not* true.  Currently, when a sound device node is opened,
 2508  * the sound subsystem scans for an available audio channel (or channels, if
 2509  * opened in read+write) and then assigns them to the si_drv[12] private
 2510  * data fields.  As a result, any information returned linking a channel to
 2511  * a specific character device isn't necessarily accurate.
 2512  *
 2513  * @note
 2514  * Calling threads must not hold any snddev_info or pcm_channel locks.
 2515  * 
 2516  * @param dev           device on which the ioctl was issued
 2517  * @param ai            ioctl request data container
 2518  *
 2519  * @retval 0            success
 2520  * @retval EINVAL       ai->dev specifies an invalid device
 2521  *
 2522  * @todo Verify correctness of Doxygen tags.  ;)
 2523  */
 2524 int
 2525 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
 2526 {
 2527         struct pcmchan_caps *caps;
 2528         struct pcm_channel *ch;
 2529         struct snddev_info *d;
 2530         uint32_t fmts;
 2531         int i, nchan, *rates, minch, maxch;
 2532         char *devname, buf[CHN_NAMELEN];
 2533 
 2534         /*
 2535          * If probing the device that received the ioctl, make sure it's a
 2536          * DSP device.  (Users may use this ioctl with /dev/mixer and
 2537          * /dev/midi.)
 2538          */
 2539         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
 2540                 return (EINVAL);
 2541 
 2542         ch = NULL;
 2543         devname = NULL;
 2544         nchan = 0;
 2545         bzero(buf, sizeof(buf));
 2546 
 2547         /*
 2548          * Search for the requested audio device (channel).  Start by
 2549          * iterating over pcm devices.
 2550          */ 
 2551         for (i = 0; pcm_devclass != NULL &&
 2552             i < devclass_get_maxunit(pcm_devclass); i++) {
 2553                 d = devclass_get_softc(pcm_devclass, i);
 2554                 if (!PCM_REGISTERED(d))
 2555                         continue;
 2556 
 2557                 /* XXX Need Giant magic entry ??? */
 2558 
 2559                 /* See the note in function docblock */
 2560                 PCM_UNLOCKASSERT(d);
 2561                 PCM_LOCK(d);
 2562 
 2563                 CHN_FOREACH(ch, d, channels.pcm) {
 2564                         CHN_UNLOCKASSERT(ch);
 2565                         CHN_LOCK(ch);
 2566                         if (ai->dev == -1) {
 2567                                 if (DSP_REGISTERED(d, i_dev) &&
 2568                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
 2569                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
 2570                                         devname = dsp_unit2name(buf,
 2571                                             sizeof(buf), ch->unit);
 2572                                 }
 2573                         } else if (ai->dev == nchan) {
 2574                                 devname = dsp_unit2name(buf, sizeof(buf),
 2575                                     ch->unit);
 2576                         }
 2577                         if (devname != NULL)
 2578                                 break;
 2579                         CHN_UNLOCK(ch);
 2580                         ++nchan;
 2581                 }
 2582 
 2583                 if (devname != NULL) {
 2584                         /*
 2585                          * At this point, the following synchronization stuff
 2586                          * has happened:
 2587                          * - a specific PCM device is locked.
 2588                          * - a specific audio channel has been locked, so be
 2589                          *   sure to unlock when exiting;
 2590                          */
 2591 
 2592                         caps = chn_getcaps(ch);
 2593 
 2594                         /*
 2595                          * With all handles collected, zero out the user's
 2596                          * container and begin filling in its fields.
 2597                          */
 2598                         bzero((void *)ai, sizeof(oss_audioinfo));
 2599 
 2600                         ai->dev = nchan;
 2601                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
 2602 
 2603                         if ((ch->flags & CHN_F_BUSY) == 0)
 2604                                 ai->busy = 0;
 2605                         else
 2606                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
 2607 
 2608                         /**
 2609                          * @note
 2610                          * @c cmd - OSSv4 docs: "Only supported under Linux at
 2611                          *    this moment." Cop-out, I know, but I'll save
 2612                          *    running around in the process table for later.
 2613                          *    Is there a risk of leaking information?
 2614                          */
 2615                         ai->pid = ch->pid;
 2616 
 2617                         /*
 2618                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
 2619                          * Note, however, that a single channel operates in
 2620                          * only one direction, so PCM_CAP_DUPLEX is out.
 2621                          */
 2622                         /**
 2623                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
 2624                          *       these in pcmchan::caps?
 2625                          */
 2626                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
 2627                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
 2628 
 2629                         /*
 2630                          * Collect formats supported @b natively by the
 2631                          * device.  Also determine min/max channels.  (I.e.,
 2632                          * mono, stereo, or both?)
 2633                          *
 2634                          * If any channel is stereo, maxch = 2;
 2635                          * if all channels are stereo, minch = 2, too;
 2636                          * if any channel is mono, minch = 1;
 2637                          * and if all channels are mono, maxch = 1.
 2638                          */
 2639                         minch = 0;
 2640                         maxch = 0;
 2641                         fmts = 0;
 2642                         for (i = 0; caps->fmtlist[i]; i++) {
 2643                                 fmts |= caps->fmtlist[i];
 2644                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
 2645                                         minch = (minch == 0) ? 2 : minch;
 2646                                         maxch = 2;
 2647                                 } else {
 2648                                         minch = 1;
 2649                                         maxch = (maxch == 0) ? 1 : maxch;
 2650                                 }
 2651                         }
 2652 
 2653                         if (ch->direction == PCMDIR_PLAY)
 2654                                 ai->oformats = fmts;
 2655                         else
 2656                                 ai->iformats = fmts;
 2657 
 2658                         /**
 2659                          * @note
 2660                          * @c magic - OSSv4 docs: "Reserved for internal use
 2661                          *    by OSS."
 2662                          *
 2663                          * @par
 2664                          * @c card_number - OSSv4 docs: "Number of the sound
 2665                          *    card where this device belongs or -1 if this
 2666                          *    information is not available.  Applications
 2667                          *    should normally not use this field for any
 2668                          *    purpose."
 2669                          */
 2670                         ai->card_number = -1;
 2671                         /**
 2672                          * @todo @c song_name - depends first on
 2673                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
 2674                          *          on SNDCTL_[GS]ETLABEL
 2675                          * @todo @c port_number - routing information?
 2676                          */
 2677                         ai->port_number = -1;
 2678                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
 2679                         /**
 2680                          * @note
 2681                          * @c real_device - OSSv4 docs:  "Obsolete."
 2682                          */
 2683                         ai->real_device = -1;
 2684                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
 2685                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
 2686                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
 2687                         /**
 2688                          * @note
 2689                          * @c flags - OSSv4 docs: "Reserved for future use."
 2690                          *
 2691                          * @note
 2692                          * @c binding - OSSv4 docs: "Reserved for future use."
 2693                          *
 2694                          * @todo @c handle - haven't decided how to generate
 2695                          *       this yet; bus, vendor, device IDs?
 2696                          */
 2697                         ai->min_rate = caps->minspeed;
 2698                         ai->max_rate = caps->maxspeed;
 2699 
 2700                         ai->min_channels = minch;
 2701                         ai->max_channels = maxch;
 2702 
 2703                         ai->nrates = chn_getrates(ch, &rates);
 2704                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
 2705                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
 2706 
 2707                         for (i = 0; i < ai->nrates; i++)
 2708                                 ai->rates[i] = rates[i];
 2709                         
 2710                         ai->next_play_engine = 0;
 2711                         ai->next_rec_engine = 0;
 2712 
 2713                         CHN_UNLOCK(ch);
 2714                 }
 2715 
 2716                 PCM_UNLOCK(d);
 2717 
 2718                 if (devname != NULL)
 2719                         return (0);
 2720         }
 2721 
 2722         /* Exhausted the search -- nothing is locked, so return. */
 2723         return (EINVAL);
 2724 }
 2725 
 2726 /**
 2727  * @brief Assigns a PCM channel to a sync group.
 2728  *
 2729  * Sync groups are used to enable audio operations on multiple devices
 2730  * simultaneously.  They may be used with any number of devices and may
 2731  * span across applications.  Devices are added to groups with
 2732  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
 2733  * SNDCTL_DSP_SYNCSTART ioctl.
 2734  *
 2735  * If the @c id field of the @c group parameter is set to zero, then a new
 2736  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
 2737  * the group specified.
 2738  *
 2739  * @todo As far as memory allocation, should we assume that things are
 2740  *       okay and allocate with M_WAITOK before acquiring channel locks,
 2741  *       freeing later if not?
 2742  *
 2743  * @param wrch  output channel associated w/ device (if any)
 2744  * @param rdch  input channel associated w/ device (if any)
 2745  * @param group Sync group parameters
 2746  *
 2747  * @retval 0            success
 2748  * @retval non-zero     error to be propagated upstream
 2749  */
 2750 static int
 2751 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
 2752 {
 2753         struct pcmchan_syncmember *smrd, *smwr;
 2754         struct pcmchan_syncgroup *sg;
 2755         int ret, sg_ids[3];
 2756 
 2757         smrd = NULL;
 2758         smwr = NULL;
 2759         sg = NULL;
 2760         ret = 0;
 2761 
 2762         /*
 2763          * Free_unr() may sleep, so store released syncgroup IDs until after
 2764          * all locks are released.
 2765          */
 2766         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
 2767 
 2768         PCM_SG_LOCK();
 2769 
 2770         /*
 2771          * - Insert channel(s) into group's member list.
 2772          * - Set CHN_F_NOTRIGGER on channel(s).
 2773          * - Stop channel(s).  
 2774          */
 2775 
 2776         /*
 2777          * If device's channels are already mapped to a group, unmap them.
 2778          */
 2779         if (wrch) {
 2780                 CHN_LOCK(wrch);
 2781                 sg_ids[0] = chn_syncdestroy(wrch);
 2782         }
 2783 
 2784         if (rdch) {
 2785                 CHN_LOCK(rdch);
 2786                 sg_ids[1] = chn_syncdestroy(rdch);
 2787         }
 2788 
 2789         /*
 2790          * Verify that mode matches character device properites.
 2791          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
 2792          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
 2793          */
 2794         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
 2795             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
 2796                 ret = EINVAL;
 2797                 goto out;
 2798         }
 2799 
 2800         /*
 2801          * An id of zero indicates the user wants to create a new
 2802          * syncgroup.
 2803          */
 2804         if (group->id == 0) {
 2805                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 2806                 if (sg != NULL) {
 2807                         SLIST_INIT(&sg->members);
 2808                         sg->id = alloc_unr(pcmsg_unrhdr);
 2809 
 2810                         group->id = sg->id;
 2811                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
 2812                 } else
 2813                         ret = ENOMEM;
 2814         } else {
 2815                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2816                         if (sg->id == group->id)
 2817                                 break;
 2818                 }
 2819                 if (sg == NULL)
 2820                         ret = EINVAL;
 2821         }
 2822 
 2823         /* Couldn't create or find a syncgroup.  Fail. */
 2824         if (sg == NULL)
 2825                 goto out;
 2826 
 2827         /*
 2828          * Allocate a syncmember, assign it and a channel together, and
 2829          * insert into syncgroup.
 2830          */
 2831         if (group->mode & PCM_ENABLE_INPUT) {
 2832                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 2833                 if (smrd == NULL) {
 2834                         ret = ENOMEM;
 2835                         goto out;
 2836                 }
 2837 
 2838                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
 2839                 smrd->parent = sg;
 2840                 smrd->ch = rdch;
 2841 
 2842                 chn_abort(rdch);
 2843                 rdch->flags |= CHN_F_NOTRIGGER;
 2844                 rdch->sm = smrd;
 2845         }
 2846 
 2847         if (group->mode & PCM_ENABLE_OUTPUT) {
 2848                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 2849                 if (smwr == NULL) {
 2850                         ret = ENOMEM;
 2851                         goto out;
 2852                 }
 2853 
 2854                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
 2855                 smwr->parent = sg;
 2856                 smwr->ch = wrch;
 2857 
 2858                 chn_abort(wrch);
 2859                 wrch->flags |= CHN_F_NOTRIGGER;
 2860                 wrch->sm = smwr;
 2861         }
 2862 
 2863 
 2864 out:
 2865         if (ret != 0) {
 2866                 if (smrd != NULL)
 2867                         free(smrd, M_DEVBUF);
 2868                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
 2869                         sg_ids[2] = sg->id;
 2870                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2871                         free(sg, M_DEVBUF);
 2872                 }
 2873 
 2874                 if (wrch)
 2875                         wrch->sm = NULL;
 2876                 if (rdch)
 2877                         rdch->sm = NULL;
 2878         }
 2879 
 2880         if (wrch)
 2881                 CHN_UNLOCK(wrch);
 2882         if (rdch)
 2883                 CHN_UNLOCK(rdch);
 2884 
 2885         PCM_SG_UNLOCK();
 2886 
 2887         if (sg_ids[0])
 2888                 free_unr(pcmsg_unrhdr, sg_ids[0]);
 2889         if (sg_ids[1])
 2890                 free_unr(pcmsg_unrhdr, sg_ids[1]);
 2891         if (sg_ids[2])
 2892                 free_unr(pcmsg_unrhdr, sg_ids[2]);
 2893 
 2894         return (ret);
 2895 }
 2896 
 2897 /**
 2898  * @brief Launch a sync group into action
 2899  *
 2900  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
 2901  * iterates over all members, triggering them along the way.
 2902  *
 2903  * @note Caller must not hold any channel locks.
 2904  *
 2905  * @param sg_id sync group identifier
 2906  *
 2907  * @retval 0    success
 2908  * @retval non-zero     error worthy of propagating upstream to user
 2909  */
 2910 static int
 2911 dsp_oss_syncstart(int sg_id)
 2912 {
 2913         struct pcmchan_syncmember *sm, *sm_tmp;
 2914         struct pcmchan_syncgroup *sg;
 2915         struct pcm_channel *c;
 2916         int ret, needlocks;
 2917 
 2918         /* Get the synclists lock */
 2919         PCM_SG_LOCK();
 2920 
 2921         do {
 2922                 ret = 0;
 2923                 needlocks = 0;
 2924 
 2925                 /* Search for syncgroup by ID */
 2926                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2927                         if (sg->id == sg_id)
 2928                                 break;
 2929                 }
 2930 
 2931                 /* Return EINVAL if not found */
 2932                 if (sg == NULL) {
 2933                         ret = EINVAL;
 2934                         break;
 2935                 }
 2936 
 2937                 /* Any removals resulting in an empty group should've handled this */
 2938                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
 2939 
 2940                 /*
 2941                  * Attempt to lock all member channels - if any are already
 2942                  * locked, unlock those acquired, sleep for a bit, and try
 2943                  * again.
 2944                  */
 2945                 SLIST_FOREACH(sm, &sg->members, link) {
 2946                         if (CHN_TRYLOCK(sm->ch) == 0) {
 2947                                 int timo = hz * 5/1000; 
 2948                                 if (timo < 1)
 2949                                         timo = 1;
 2950 
 2951                                 /* Release all locked channels so far, retry */
 2952                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
 2953                                         /* sm is the member already locked */
 2954                                         if (sm == sm_tmp)
 2955                                                 break;
 2956                                         CHN_UNLOCK(sm_tmp->ch);
 2957                                 }
 2958 
 2959                                 /** @todo Is PRIBIO correct/ */
 2960                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
 2961                                     PRIBIO | PCATCH, "pcmsg", timo);
 2962                                 if (ret == EINTR || ret == ERESTART)
 2963                                         break;
 2964 
 2965                                 needlocks = 1;
 2966                                 ret = 0; /* Assumes ret == EAGAIN... */
 2967                         }
 2968                 }
 2969         } while (needlocks && ret == 0);
 2970 
 2971         /* Proceed only if no errors encountered. */
 2972         if (ret == 0) {
 2973                 /* Launch channels */
 2974                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
 2975                         SLIST_REMOVE_HEAD(&sg->members, link);
 2976 
 2977                         c = sm->ch;
 2978                         c->sm = NULL;
 2979                         chn_start(c, 1);
 2980                         c->flags &= ~CHN_F_NOTRIGGER;
 2981                         CHN_UNLOCK(c);
 2982 
 2983                         free(sm, M_DEVBUF);
 2984                 }
 2985 
 2986                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2987                 free(sg, M_DEVBUF);
 2988         }
 2989 
 2990         PCM_SG_UNLOCK();
 2991 
 2992         /*
 2993          * Free_unr() may sleep, so be sure to give up the syncgroup lock
 2994          * first.
 2995          */
 2996         if (ret == 0)
 2997                 free_unr(pcmsg_unrhdr, sg_id);
 2998 
 2999         return (ret);
 3000 }
 3001 
 3002 /**
 3003  * @brief Handler for SNDCTL_DSP_POLICY
 3004  *
 3005  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
 3006  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
 3007  * specifying those two parameters, s/he simply selects a number from 0..10
 3008  * which corresponds to a buffer size.  Smaller numbers request smaller
 3009  * buffers with lower latencies (at greater overhead from more frequent
 3010  * interrupts), while greater numbers behave in the opposite manner.
 3011  *
 3012  * The 4Front spec states that a value of 5 should be the default.  However,
 3013  * this implementation deviates slightly by using a linear scale without
 3014  * consulting drivers.  I.e., even though drivers may have different default
 3015  * buffer sizes, a policy argument of 5 will have the same result across
 3016  * all drivers.
 3017  *
 3018  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
 3019  * more information.
 3020  *
 3021  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
 3022  *       work with hardware drivers directly.
 3023  *
 3024  * @note PCM channel arguments must not be locked by caller.
 3025  *
 3026  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
 3027  * @param rdch  " recording channel (optional; may be NULL)
 3028  * @param policy Integer from [0:10]
 3029  *
 3030  * @retval 0    constant (for now)
 3031  */
 3032 static int
 3033 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
 3034 {
 3035         int ret;
 3036 
 3037         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
 3038                 return (EIO);
 3039 
 3040         /* Default: success */
 3041         ret = 0;
 3042 
 3043         if (rdch) {
 3044                 CHN_LOCK(rdch);
 3045                 ret = chn_setlatency(rdch, policy);
 3046                 CHN_UNLOCK(rdch);
 3047         }
 3048 
 3049         if (wrch && ret == 0) {
 3050                 CHN_LOCK(wrch);
 3051                 ret = chn_setlatency(wrch, policy);
 3052                 CHN_UNLOCK(wrch);
 3053         }
 3054 
 3055         if (ret)
 3056                 ret = EIO;
 3057 
 3058         return (ret);
 3059 }
 3060 
 3061 /**
 3062  * @brief Enable or disable "cooked" mode
 3063  *
 3064  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
 3065  * is the default, the sound system handles rate and format conversions
 3066  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
 3067  * operates with 44100Hz/16bit/signed samples).
 3068  *
 3069  * Disabling cooked mode is intended for applications wanting to mmap()
 3070  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
 3071  * feeder architecture, presumably to gain as much control over audio
 3072  * hardware as possible.
 3073  *
 3074  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
 3075  * for more details.
 3076  *
 3077  * @param wrch          playback channel (optional; may be NULL)
 3078  * @param rdch          recording channel (optional; may be NULL)
 3079  * @param enabled       0 = raw mode, 1 = cooked mode
 3080  *
 3081  * @retval EINVAL       Operation not yet supported.
 3082  */
 3083 static int
 3084 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
 3085 {
 3086 
 3087         /*
 3088          * XXX I just don't get it. Why don't they call it
 3089          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
 3090          * This is just plain so confusing, incoherent,
 3091          * <insert any non-printable characters here>.
 3092          */
 3093         if (!(enabled == 1 || enabled == 0))
 3094                 return (EINVAL);
 3095 
 3096         /*
 3097          * I won't give in. I'm inverting its logic here and now.
 3098          * Brag all you want, but "BITPERFECT" should be the better
 3099          * term here.
 3100          */
 3101         enabled ^= 0x00000001;
 3102 
 3103         if (wrch != NULL) {
 3104                 CHN_LOCK(wrch);
 3105                 wrch->flags &= ~CHN_F_BITPERFECT;
 3106                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3107                 CHN_UNLOCK(wrch);
 3108         }
 3109 
 3110         if (rdch != NULL) {
 3111                 CHN_LOCK(rdch);
 3112                 rdch->flags &= ~CHN_F_BITPERFECT;
 3113                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3114                 CHN_UNLOCK(rdch);
 3115         }
 3116 
 3117         return (0);
 3118 }
 3119 
 3120 /**
 3121  * @brief Retrieve channel interleaving order
 3122  *
 3123  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
 3124  *
 3125  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
 3126  * for more details.
 3127  *
 3128  * @note As the ioctl definition is still under construction, FreeBSD
 3129  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
 3130  *
 3131  * @param wrch  playback channel (optional; may be NULL)
 3132  * @param rdch  recording channel (optional; may be NULL)
 3133  * @param map   channel map (result will be stored there)
 3134  *
 3135  * @retval EINVAL       Operation not yet supported.
 3136  */
 3137 static int
 3138 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3139 {
 3140         struct pcm_channel *ch;
 3141         int ret;
 3142 
 3143         ch = (wrch != NULL) ? wrch : rdch;
 3144         if (ch != NULL) {
 3145                 CHN_LOCK(ch);
 3146                 ret = chn_oss_getorder(ch, map);
 3147                 CHN_UNLOCK(ch);
 3148         } else
 3149                 ret = EINVAL;
 3150 
 3151         return (ret);
 3152 }
 3153 
 3154 /**
 3155  * @brief Specify channel interleaving order
 3156  *
 3157  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
 3158  *
 3159  * @note As the ioctl definition is still under construction, FreeBSD
 3160  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
 3161  *
 3162  * @param wrch  playback channel (optional; may be NULL)
 3163  * @param rdch  recording channel (optional; may be NULL)
 3164  * @param map   channel map
 3165  *
 3166  * @retval EINVAL       Operation not yet supported.
 3167  */
 3168 static int
 3169 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3170 {
 3171         int ret;
 3172 
 3173         ret = 0;
 3174 
 3175         if (wrch != NULL) {
 3176                 CHN_LOCK(wrch);
 3177                 ret = chn_oss_setorder(wrch, map);
 3178                 CHN_UNLOCK(wrch);
 3179         }
 3180 
 3181         if (ret == 0 && rdch != NULL) {
 3182                 CHN_LOCK(rdch);
 3183                 ret = chn_oss_setorder(rdch, map);
 3184                 CHN_UNLOCK(rdch);
 3185         }
 3186 
 3187         return (ret);
 3188 }
 3189 
 3190 static int
 3191 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
 3192     int *mask)
 3193 {
 3194         struct pcm_channel *ch;
 3195         uint32_t chnmask;
 3196         int ret;
 3197 
 3198         chnmask = 0;
 3199         ch = (wrch != NULL) ? wrch : rdch;
 3200 
 3201         if (ch != NULL) {
 3202                 CHN_LOCK(ch);
 3203                 ret = chn_oss_getmask(ch, &chnmask);
 3204                 CHN_UNLOCK(ch);
 3205         } else
 3206                 ret = EINVAL;
 3207 
 3208         if (ret == 0)
 3209                 *mask = chnmask;
 3210 
 3211         return (ret);
 3212 }
 3213 
 3214 #ifdef OSSV4_EXPERIMENT
 3215 /**
 3216  * @brief Retrieve an audio device's label
 3217  *
 3218  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
 3219  *
 3220  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3221  * for more details.
 3222  *
 3223  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
 3224  * consoles) can show variable "labels" for certain controls. By default
 3225  * the application name (say quake) is shown as the label but
 3226  * applications may change the labels themselves."
 3227  *
 3228  * @note As the ioctl definition is still under construction, FreeBSD
 3229  *       does not currently support @c SNDCTL_GETLABEL.
 3230  *
 3231  * @param wrch  playback channel (optional; may be NULL)
 3232  * @param rdch  recording channel (optional; may be NULL)
 3233  * @param label label gets copied here
 3234  *
 3235  * @retval EINVAL       Operation not yet supported.
 3236  */
 3237 static int
 3238 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3239 {
 3240         return (EINVAL);
 3241 }
 3242 
 3243 /**
 3244  * @brief Specify an audio device's label
 3245  *
 3246  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
 3247  * comments for @c dsp_oss_getlabel immediately above.
 3248  *
 3249  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3250  * for more details.
 3251  *
 3252  * @note As the ioctl definition is still under construction, FreeBSD
 3253  *       does not currently support SNDCTL_SETLABEL.
 3254  *
 3255  * @param wrch  playback channel (optional; may be NULL)
 3256  * @param rdch  recording channel (optional; may be NULL)
 3257  * @param label label gets copied from here
 3258  *
 3259  * @retval EINVAL       Operation not yet supported.
 3260  */
 3261 static int
 3262 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3263 {
 3264         return (EINVAL);
 3265 }
 3266 
 3267 /**
 3268  * @brief Retrieve name of currently played song
 3269  *
 3270  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
 3271  * tell the system the name of the currently playing song, which would be
 3272  * visible in @c /dev/sndstat.
 3273  *
 3274  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
 3275  * for more details.
 3276  *
 3277  * @note As the ioctl definition is still under construction, FreeBSD
 3278  *       does not currently support SNDCTL_GETSONG.
 3279  *
 3280  * @param wrch  playback channel (optional; may be NULL)
 3281  * @param rdch  recording channel (optional; may be NULL)
 3282  * @param song  song name gets copied here
 3283  *
 3284  * @retval EINVAL       Operation not yet supported.
 3285  */
 3286 static int
 3287 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3288 {
 3289         return (EINVAL);
 3290 }
 3291 
 3292 /**
 3293  * @brief Retrieve name of currently played song
 3294  *
 3295  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
 3296  * tell the system the name of the currently playing song, which would be
 3297  * visible in @c /dev/sndstat.
 3298  *
 3299  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
 3300  * for more details.
 3301  *
 3302  * @note As the ioctl definition is still under construction, FreeBSD
 3303  *       does not currently support SNDCTL_SETSONG.
 3304  *
 3305  * @param wrch  playback channel (optional; may be NULL)
 3306  * @param rdch  recording channel (optional; may be NULL)
 3307  * @param song  song name gets copied from here
 3308  *
 3309  * @retval EINVAL       Operation not yet supported.
 3310  */
 3311 static int
 3312 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3313 {
 3314         return (EINVAL);
 3315 }
 3316 
 3317 /**
 3318  * @brief Rename a device
 3319  *
 3320  * This is a handler for the @c SNDCTL_SETNAME ioctl.
 3321  *
 3322  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
 3323  * more details.
 3324  *
 3325  * From Hannu@4Front:  "This call is used to change the device name
 3326  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
 3327  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
 3328  * name depending on the current context (for example 'OSS virtual wave table
 3329  * synth' or 'VoIP link to London')."
 3330  *
 3331  * @note As the ioctl definition is still under construction, FreeBSD
 3332  *       does not currently support SNDCTL_SETNAME.
 3333  *
 3334  * @param wrch  playback channel (optional; may be NULL)
 3335  * @param rdch  recording channel (optional; may be NULL)
 3336  * @param name  new device name gets copied from here
 3337  *
 3338  * @retval EINVAL       Operation not yet supported.
 3339  */
 3340 static int
 3341 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
 3342 {
 3343         return (EINVAL);
 3344 }
 3345 #endif  /* !OSSV4_EXPERIMENT */

Cache object: b04308e9d4ddf1fe41480bee03784875


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.