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


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

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    1 /*-
    2  * Copyright (c) 2001 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 #include <dev/sound/pcm/vchan.h>
   29 #ifdef  USING_MUTEX
   30 #include <sys/sx.h>
   31 #endif
   32 
   33 SND_DECLARE_FILE("$FreeBSD$");
   34 
   35 #define SS_TYPE_MODULE          0
   36 #define SS_TYPE_FIRST           1
   37 #define SS_TYPE_PCM             1
   38 #define SS_TYPE_MIDI            2
   39 #define SS_TYPE_SEQUENCER       3
   40 #define SS_TYPE_LAST            3
   41 
   42 static d_open_t sndstat_open;
   43 static d_close_t sndstat_close;
   44 static d_read_t sndstat_read;
   45 
   46 static struct cdevsw sndstat_cdevsw = {
   47         .d_version =    D_VERSION,
   48         .d_flags =      D_NEEDGIANT,
   49         .d_open =       sndstat_open,
   50         .d_close =      sndstat_close,
   51         .d_read =       sndstat_read,
   52         .d_name =       "sndstat",
   53 };
   54 
   55 struct sndstat_entry {
   56         SLIST_ENTRY(sndstat_entry) link;
   57         device_t dev;
   58         char *str;
   59         sndstat_handler handler;
   60         int type, unit;
   61 };
   62 
   63 #ifdef  USING_MUTEX
   64 static struct sx sndstat_lock;
   65 #endif
   66 static struct sbuf sndstat_sbuf;
   67 static struct cdev *sndstat_dev = 0;
   68 static int sndstat_isopen = 0;
   69 static int sndstat_bufptr;
   70 static int sndstat_maxunit = -1;
   71 static int sndstat_files = 0;
   72 
   73 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
   74 
   75 static int sndstat_verbose = 1;
   76 #ifdef  USING_MUTEX
   77 TUNABLE_INT("hw.snd.verbose", &sndstat_verbose);
   78 #else
   79 TUNABLE_INT_DECL("hw.snd.verbose", 1, sndstat_verbose);
   80 #endif
   81 
   82 static int sndstat_prepare(struct sbuf *s);
   83 
   84 static int
   85 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
   86 {
   87         int error, verbose;
   88 
   89         verbose = sndstat_verbose;
   90         error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req);
   91         if (error == 0 && req->newptr != NULL) {
   92                 sx_xlock(&sndstat_lock);
   93                 if (verbose < 0 || verbose > 3)
   94                         error = EINVAL;
   95                 else
   96                         sndstat_verbose = verbose;
   97                 sx_xunlock(&sndstat_lock);
   98         }
   99         return error;
  100 }
  101 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
  102             0, sizeof(int), sysctl_hw_sndverbose, "I", "");
  103 
  104 static int
  105 sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  106 {
  107         int error;
  108 
  109         sx_xlock(&sndstat_lock);
  110         if (sndstat_isopen) {
  111                 sx_xunlock(&sndstat_lock);
  112                 return EBUSY;
  113         }
  114         sndstat_isopen = 1;
  115         sx_xunlock(&sndstat_lock);
  116         if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) {
  117                 error = ENXIO;
  118                 goto out;
  119         }
  120         sndstat_bufptr = 0;
  121         error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
  122 out:
  123         if (error) {
  124                 sx_xlock(&sndstat_lock);
  125                 sndstat_isopen = 0;
  126                 sx_xunlock(&sndstat_lock);
  127         }
  128         return (error);
  129 }
  130 
  131 static int
  132 sndstat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  133 {
  134         sx_xlock(&sndstat_lock);
  135         if (!sndstat_isopen) {
  136                 sx_xunlock(&sndstat_lock);
  137                 return EBADF;
  138         }
  139         sbuf_delete(&sndstat_sbuf);
  140         sndstat_isopen = 0;
  141 
  142         sx_xunlock(&sndstat_lock);
  143         return 0;
  144 }
  145 
  146 static int
  147 sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
  148 {
  149         int l, err;
  150 
  151         sx_xlock(&sndstat_lock);
  152         if (!sndstat_isopen) {
  153                 sx_xunlock(&sndstat_lock);
  154                 return EBADF;
  155         }
  156         l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
  157         err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
  158         sndstat_bufptr += l;
  159 
  160         sx_xunlock(&sndstat_lock);
  161         return err;
  162 }
  163 
  164 /************************************************************************/
  165 
  166 static struct sndstat_entry *
  167 sndstat_find(int type, int unit)
  168 {
  169         struct sndstat_entry *ent;
  170 
  171         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  172                 if (ent->type == type && ent->unit == unit)
  173                         return ent;
  174         }
  175 
  176         return NULL;
  177 }
  178 
  179 int
  180 sndstat_acquire(void)
  181 {
  182         sx_xlock(&sndstat_lock);
  183         if (sndstat_isopen) {
  184                 sx_xunlock(&sndstat_lock);
  185                 return EBUSY;
  186         }
  187         sndstat_isopen = 1;
  188         sx_xunlock(&sndstat_lock);
  189         return 0;
  190 }
  191 
  192 int
  193 sndstat_release(void)
  194 {
  195         sx_xlock(&sndstat_lock);
  196         if (!sndstat_isopen) {
  197                 sx_xunlock(&sndstat_lock);
  198                 return EBADF;
  199         }
  200         sndstat_isopen = 0;
  201         sx_xunlock(&sndstat_lock);
  202         return 0;
  203 }
  204 
  205 int
  206 sndstat_register(device_t dev, char *str, sndstat_handler handler)
  207 {
  208         struct sndstat_entry *ent;
  209         const char *devtype;
  210         int type, unit;
  211 
  212         if (dev) {
  213                 unit = device_get_unit(dev);
  214                 devtype = device_get_name(dev);
  215                 if (!strcmp(devtype, "pcm"))
  216                         type = SS_TYPE_PCM;
  217                 else if (!strcmp(devtype, "midi"))
  218                         type = SS_TYPE_MIDI;
  219                 else if (!strcmp(devtype, "sequencer"))
  220                         type = SS_TYPE_SEQUENCER;
  221                 else
  222                         return EINVAL;
  223         } else {
  224                 type = SS_TYPE_MODULE;
  225                 unit = -1;
  226         }
  227 
  228         ent = malloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK);
  229         if (!ent)
  230                 return ENOSPC;
  231 
  232         ent->dev = dev;
  233         ent->str = str;
  234         ent->type = type;
  235         ent->unit = unit;
  236         ent->handler = handler;
  237 
  238         sx_xlock(&sndstat_lock);
  239         SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
  240         if (type == SS_TYPE_MODULE)
  241                 sndstat_files++;
  242         sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
  243         sx_xunlock(&sndstat_lock);
  244 
  245         return 0;
  246 }
  247 
  248 int
  249 sndstat_registerfile(char *str)
  250 {
  251         return sndstat_register(NULL, str, NULL);
  252 }
  253 
  254 int
  255 sndstat_unregister(device_t dev)
  256 {
  257         struct sndstat_entry *ent;
  258 
  259         sx_xlock(&sndstat_lock);
  260         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  261                 if (ent->dev == dev) {
  262                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  263                         sx_xunlock(&sndstat_lock);
  264                         free(ent, M_DEVBUF);
  265 
  266                         return 0;
  267                 }
  268         }
  269         sx_xunlock(&sndstat_lock);
  270 
  271         return ENXIO;
  272 }
  273 
  274 int
  275 sndstat_unregisterfile(char *str)
  276 {
  277         struct sndstat_entry *ent;
  278 
  279         sx_xlock(&sndstat_lock);
  280         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  281                 if (ent->dev == NULL && ent->str == str) {
  282                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  283                         sndstat_files--;
  284                         sx_xunlock(&sndstat_lock);
  285                         free(ent, M_DEVBUF);
  286 
  287                         return 0;
  288                 }
  289         }
  290         sx_xunlock(&sndstat_lock);
  291 
  292         return ENXIO;
  293 }
  294 
  295 /************************************************************************/
  296 
  297 static int
  298 sndstat_prepare(struct sbuf *s)
  299 {
  300         struct sndstat_entry *ent;
  301         int i, j;
  302 
  303         sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n");
  304         if (SLIST_EMPTY(&sndstat_devlist)) {
  305                 sbuf_printf(s, "No devices installed.\n");
  306                 sbuf_finish(s);
  307                 return sbuf_len(s);
  308         }
  309 
  310         sbuf_printf(s, "Installed devices:\n");
  311 
  312         for (i = 0; i <= sndstat_maxunit; i++) {
  313                 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
  314                         ent = sndstat_find(j, i);
  315                         if (!ent)
  316                                 continue;
  317                         sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
  318                         sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
  319                         sbuf_printf(s, " %s", ent->str);
  320                         if (ent->handler)
  321                                 ent->handler(s, ent->dev, sndstat_verbose);
  322                         else
  323                                 sbuf_printf(s, " [no handler]");
  324                         sbuf_printf(s, "\n");
  325                 }
  326         }
  327 
  328         if (sndstat_verbose >= 3 && sndstat_files > 0) {
  329                 sbuf_printf(s, "\nFile Versions:\n");
  330 
  331                 SLIST_FOREACH(ent, &sndstat_devlist, link) {
  332                         if (ent->dev == NULL && ent->str != NULL)
  333                                 sbuf_printf(s, "%s\n", ent->str);
  334                 }
  335         }
  336 
  337         sbuf_finish(s);
  338         return sbuf_len(s);
  339 }
  340 
  341 static int
  342 sndstat_init(void)
  343 {
  344         sx_init(&sndstat_lock, "sndstat");
  345         sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS, UID_ROOT, GID_WHEEL, 0444, "sndstat");
  346 
  347         return (sndstat_dev != 0)? 0 : ENXIO;
  348 }
  349 
  350 static int
  351 sndstat_uninit(void)
  352 {
  353         sx_xlock(&sndstat_lock);
  354         if (sndstat_isopen) {
  355                 sx_xunlock(&sndstat_lock);
  356                 return EBUSY;
  357         }
  358 
  359         if (sndstat_dev)
  360                 destroy_dev(sndstat_dev);
  361         sndstat_dev = 0;
  362 
  363         sx_xunlock(&sndstat_lock);
  364         sx_destroy(&sndstat_lock);
  365         return 0;
  366 }
  367 
  368 static void
  369 sndstat_sysinit(void *p)
  370 {
  371         sndstat_init();
  372 }
  373 
  374 static void
  375 sndstat_sysuninit(void *p)
  376 {
  377         int error;
  378 
  379         error = sndstat_uninit();
  380         KASSERT(error == 0, ("%s: error = %d", __func__, error));
  381 }
  382 
  383 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
  384 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);
  385 
  386 

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