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  * $FreeBSD: src/sys/dev/sound/pcm/sndstat.c,v 1.20.2.2 2005/12/30 19:55:54 netchild Exp $
   27  */
   28 
   29 #include <dev/sound/pcm/sound.h>
   30 #include <dev/sound/pcm/vchan.h>
   31 #ifdef  USING_MUTEX
   32 #include <sys/lock.h>
   33 #endif
   34 
   35 
   36 #define SS_TYPE_MODULE          0
   37 #define SS_TYPE_FIRST           1
   38 #define SS_TYPE_PCM             1
   39 #define SS_TYPE_MIDI            2
   40 #define SS_TYPE_SEQUENCER       3
   41 #define SS_TYPE_LAST            3
   42 
   43 static d_open_t sndstat_open;
   44 static d_close_t sndstat_close;
   45 static d_read_t sndstat_read;
   46 
   47 static struct dev_ops sndstat_cdevsw = {
   48         { "sndstat", 0, 0 },
   49         /* .d_flags =   D_NEEDGIANT, */
   50         .d_open =       sndstat_open,
   51         .d_close =      sndstat_close,
   52         .d_read =       sndstat_read,
   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 lock sndstat_lock;
   65 #endif
   66 static struct sbuf sndstat_sbuf;
   67 static int sndstat_isopen = 0;
   68 static int sndstat_bufptr;
   69 static int sndstat_maxunit = -1;
   70 static int sndstat_files = 0;
   71 
   72 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
   73 
   74 static int sndstat_verbose = 1;
   75 #ifdef  USING_MUTEX
   76 TUNABLE_INT("hw.snd.verbose", &sndstat_verbose);
   77 #else
   78 TUNABLE_INT_DECL("hw.snd.verbose", 1, sndstat_verbose);
   79 #endif
   80 
   81 static int sndstat_prepare(struct sbuf *s);
   82 
   83 static int
   84 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
   85 {
   86         int error, verbose;
   87 
   88         verbose = sndstat_verbose;
   89         error = sysctl_handle_int(oidp, &verbose, sizeof(verbose), req);
   90         if (error == 0 && req->newptr != NULL) {
   91                 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
   92                 if (verbose < 0 || verbose > 3)
   93                         error = EINVAL;
   94                 else
   95                         sndstat_verbose = verbose;
   96                 lockmgr(&sndstat_lock, LK_RELEASE);
   97         }
   98         return error;
   99 }
  100 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
  101             0, sizeof(int), sysctl_hw_sndverbose, "I", "");
  102 
  103 static int
  104 sndstat_open(struct dev_open_args *ap)
  105 {
  106         int error;
  107 
  108         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  109         if (sndstat_isopen) {
  110                 lockmgr(&sndstat_lock, LK_RELEASE);
  111                 return EBUSY;
  112         }
  113         sndstat_isopen = 1;
  114         lockmgr(&sndstat_lock, LK_RELEASE);
  115         if (sbuf_new(&sndstat_sbuf, NULL, 4096, 0) == NULL) {
  116                 error = ENXIO;
  117                 goto out;
  118         }
  119         sndstat_bufptr = 0;
  120         error = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
  121 out:
  122         if (error) {
  123                 lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  124                 sndstat_isopen = 0;
  125                 lockmgr(&sndstat_lock, LK_RELEASE);
  126         }
  127         return (error);
  128 }
  129 
  130 static int
  131 sndstat_close(struct dev_close_args *ap)
  132 {
  133         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  134         if (!sndstat_isopen) {
  135                 lockmgr(&sndstat_lock, LK_RELEASE);
  136                 return EBADF;
  137         }
  138         sbuf_delete(&sndstat_sbuf);
  139         sndstat_isopen = 0;
  140 
  141         lockmgr(&sndstat_lock, LK_RELEASE);
  142         return 0;
  143 }
  144 
  145 static int
  146 sndstat_read(struct dev_read_args *ap)
  147 {
  148         struct uio *buf = ap->a_uio;
  149         int l, err;
  150 
  151         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  152         if (!sndstat_isopen) {
  153                 lockmgr(&sndstat_lock, LK_RELEASE);
  154                 return EBADF;
  155         }
  156         l = (int)szmin(buf->uio_resid,
  157                        sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
  158         if (l > 0) {
  159                 err = uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr,
  160                               l, buf);
  161         } else {
  162                 err = 0;
  163         }
  164         sndstat_bufptr += l;
  165 
  166         lockmgr(&sndstat_lock, LK_RELEASE);
  167         return err;
  168 }
  169 
  170 /************************************************************************/
  171 
  172 static struct sndstat_entry *
  173 sndstat_find(int type, int unit)
  174 {
  175         struct sndstat_entry *ent;
  176 
  177         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  178                 if (ent->type == type && ent->unit == unit)
  179                         return ent;
  180         }
  181 
  182         return NULL;
  183 }
  184 
  185 int
  186 sndstat_acquire(void)
  187 {
  188         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  189         if (sndstat_isopen) {
  190                 lockmgr(&sndstat_lock, LK_RELEASE);
  191                 return EBUSY;
  192         }
  193         sndstat_isopen = 1;
  194         lockmgr(&sndstat_lock, LK_RELEASE);
  195         return 0;
  196 }
  197 
  198 int
  199 sndstat_release(void)
  200 {
  201         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  202         if (!sndstat_isopen) {
  203                 lockmgr(&sndstat_lock, LK_RELEASE);
  204                 return EBADF;
  205         }
  206         sndstat_isopen = 0;
  207         lockmgr(&sndstat_lock, LK_RELEASE);
  208         return 0;
  209 }
  210 
  211 int
  212 sndstat_register(device_t dev, char *str, sndstat_handler handler)
  213 {
  214         struct sndstat_entry *ent;
  215         const char *devtype;
  216         int type, unit;
  217 
  218         if (dev) {
  219                 unit = device_get_unit(dev);
  220                 devtype = device_get_name(dev);
  221                 if (!strcmp(devtype, "pcm"))
  222                         type = SS_TYPE_PCM;
  223                 else if (!strcmp(devtype, "midi"))
  224                         type = SS_TYPE_MIDI;
  225                 else if (!strcmp(devtype, "sequencer"))
  226                         type = SS_TYPE_SEQUENCER;
  227                 else
  228                         return EINVAL;
  229         } else {
  230                 type = SS_TYPE_MODULE;
  231                 unit = -1;
  232         }
  233 
  234         ent = kmalloc(sizeof *ent, M_DEVBUF, M_ZERO | M_WAITOK);
  235 
  236         ent->dev = dev;
  237         ent->str = str;
  238         ent->type = type;
  239         ent->unit = unit;
  240         ent->handler = handler;
  241 
  242         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  243         SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
  244         if (type == SS_TYPE_MODULE)
  245                 sndstat_files++;
  246         sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
  247         lockmgr(&sndstat_lock, LK_RELEASE);
  248 
  249         return 0;
  250 }
  251 
  252 int
  253 sndstat_registerfile(char *str)
  254 {
  255         return sndstat_register(NULL, str, NULL);
  256 }
  257 
  258 int
  259 sndstat_unregister(device_t dev)
  260 {
  261         struct sndstat_entry *ent;
  262 
  263         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  264         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  265                 if (ent->dev == dev) {
  266                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  267                         lockmgr(&sndstat_lock, LK_RELEASE);
  268                         kfree(ent, M_DEVBUF);
  269 
  270                         return 0;
  271                 }
  272         }
  273         lockmgr(&sndstat_lock, LK_RELEASE);
  274 
  275         return ENXIO;
  276 }
  277 
  278 int
  279 sndstat_unregisterfile(char *str)
  280 {
  281         struct sndstat_entry *ent;
  282 
  283         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  284         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  285                 if (ent->dev == NULL && ent->str == str) {
  286                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  287                         sndstat_files--;
  288                         lockmgr(&sndstat_lock, LK_RELEASE);
  289                         kfree(ent, M_DEVBUF);
  290 
  291                         return 0;
  292                 }
  293         }
  294         lockmgr(&sndstat_lock, LK_RELEASE);
  295 
  296         return ENXIO;
  297 }
  298 
  299 /************************************************************************/
  300 
  301 static int
  302 sndstat_prepare(struct sbuf *s)
  303 {
  304         struct sndstat_entry *ent;
  305         int i, j;
  306 
  307         sbuf_printf(s, "FreeBSD Audio Driver (newpcm)\n");
  308         if (SLIST_EMPTY(&sndstat_devlist)) {
  309                 sbuf_printf(s, "No devices installed.\n");
  310                 sbuf_finish(s);
  311                 return sbuf_len(s);
  312         }
  313 
  314         sbuf_printf(s, "Installed devices:\n");
  315 
  316         for (i = 0; i <= sndstat_maxunit; i++) {
  317                 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
  318                         ent = sndstat_find(j, i);
  319                         if (!ent)
  320                                 continue;
  321                         sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
  322                         sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
  323                         sbuf_printf(s, " %s", ent->str);
  324                         if (ent->handler)
  325                                 ent->handler(s, ent->dev, sndstat_verbose);
  326                         else
  327                                 sbuf_printf(s, " [no handler]");
  328                         sbuf_printf(s, "\n");
  329                 }
  330         }
  331 
  332         if (sndstat_verbose >= 3 && sndstat_files > 0) {
  333                 sbuf_printf(s, "\nFile Versions:\n");
  334 
  335                 SLIST_FOREACH(ent, &sndstat_devlist, link) {
  336                         if (ent->dev == NULL && ent->str != NULL)
  337                                 sbuf_printf(s, "%s\n", ent->str);
  338                 }
  339         }
  340 
  341         sbuf_finish(s);
  342         return sbuf_len(s);
  343 }
  344 
  345 static int
  346 sndstat_init(void)
  347 {
  348         lockinit(&sndstat_lock, "sndstat", 0, 0);
  349         if (make_dev(&sndstat_cdevsw, SND_DEV_STATUS,
  350                      UID_ROOT, GID_WHEEL, 0444, "sndstat") == NULL) {
  351                 return ENXIO;
  352         }
  353         return 0;
  354 }
  355 
  356 static int
  357 sndstat_uninit(void)
  358 {
  359         lockmgr(&sndstat_lock, LK_EXCLUSIVE);
  360         if (sndstat_isopen) {
  361                 lockmgr(&sndstat_lock, LK_RELEASE);
  362                 return EBUSY;
  363         }
  364 
  365         //dev_ops_remove(&sndstat_cdevsw, -1, SND_DEV_STATUS);
  366         dev_ops_remove_all(&sndstat_cdevsw);
  367         lockmgr(&sndstat_lock, LK_RELEASE);
  368         return 0;
  369 }
  370 
  371 static void
  372 sndstat_sysinit(void *p)
  373 {
  374         sndstat_init();
  375 }
  376 
  377 static void
  378 sndstat_sysuninit(void *p)
  379 {
  380         int error;
  381 
  382         error = sndstat_uninit();
  383         KASSERT(error == 0, ("%s: error = %d", __func__, error));
  384 }
  385 
  386 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
  387 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);
  388 
  389 

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