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) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #ifdef HAVE_KERNEL_OPTION_HEADERS
   29 #include "opt_snd.h"
   30 #endif
   31 
   32 #include <dev/sound/pcm/sound.h>
   33 #include <dev/sound/pcm/pcm.h>
   34 #include <dev/sound/version.h>
   35 #include <sys/sx.h>
   36 
   37 SND_DECLARE_FILE("$FreeBSD: releng/11.2/sys/dev/sound/pcm/sndstat.c 331722 2018-03-29 02:50:57Z eadler $");
   38 
   39 #define SS_TYPE_MODULE          0
   40 #define SS_TYPE_PCM             1
   41 #define SS_TYPE_MIDI            2
   42 #define SS_TYPE_SEQUENCER       3
   43 
   44 static d_open_t sndstat_open;
   45 static void sndstat_close(void *);
   46 static d_read_t sndstat_read;
   47 static d_write_t sndstat_write;
   48 
   49 static struct cdevsw sndstat_cdevsw = {
   50         .d_version =    D_VERSION,
   51         .d_open =       sndstat_open,
   52         .d_read =       sndstat_read,
   53         .d_write =      sndstat_write,
   54         .d_name =       "sndstat",
   55         .d_flags =      D_TRACKCLOSE,
   56 };
   57 
   58 struct sndstat_entry {
   59         TAILQ_ENTRY(sndstat_entry) link;
   60         device_t dev;
   61         char *str;
   62         sndstat_handler handler;
   63         int type, unit;
   64 };
   65 
   66 struct sndstat_file {
   67         TAILQ_ENTRY(sndstat_file) entry;
   68         struct sbuf sbuf;
   69         int out_offset;
   70         int in_offset;
   71 };
   72 
   73 static struct sx sndstat_lock;
   74 static struct cdev *sndstat_dev;
   75 
   76 #define SNDSTAT_LOCK() sx_xlock(&sndstat_lock)
   77 #define SNDSTAT_UNLOCK() sx_xunlock(&sndstat_lock)
   78 
   79 static TAILQ_HEAD(, sndstat_entry) sndstat_devlist = TAILQ_HEAD_INITIALIZER(sndstat_devlist);
   80 static TAILQ_HEAD(, sndstat_file) sndstat_filelist = TAILQ_HEAD_INITIALIZER(sndstat_filelist);
   81 
   82 int snd_verbose = 0;
   83 
   84 static int sndstat_prepare(struct sndstat_file *);
   85 
   86 static int
   87 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
   88 {
   89         int error, verbose;
   90 
   91         verbose = snd_verbose;
   92         error = sysctl_handle_int(oidp, &verbose, 0, req);
   93         if (error == 0 && req->newptr != NULL) {
   94                 if (verbose < 0 || verbose > 4)
   95                         error = EINVAL;
   96                 else
   97                         snd_verbose = verbose;
   98         }
   99         return (error);
  100 }
  101 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RWTUN,
  102             0, sizeof(int), sysctl_hw_sndverbose, "I", "verbosity level");
  103 
  104 static int
  105 sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  106 {
  107         struct sndstat_file *pf;
  108 
  109         pf = malloc(sizeof(*pf), M_DEVBUF, M_WAITOK | M_ZERO);
  110 
  111         SNDSTAT_LOCK();
  112         if (sbuf_new(&pf->sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
  113                 SNDSTAT_UNLOCK();
  114                 free(pf, M_DEVBUF);
  115                 return (ENOMEM);
  116         }
  117         TAILQ_INSERT_TAIL(&sndstat_filelist, pf, entry);
  118         SNDSTAT_UNLOCK();
  119 
  120         devfs_set_cdevpriv(pf, &sndstat_close);
  121 
  122         return (0);
  123 }
  124 
  125 static void
  126 sndstat_close(void *sndstat_file)
  127 {
  128         struct sndstat_file *pf = (struct sndstat_file *)sndstat_file;
  129 
  130         SNDSTAT_LOCK();
  131         sbuf_delete(&pf->sbuf);
  132         TAILQ_REMOVE(&sndstat_filelist, pf, entry);
  133         SNDSTAT_UNLOCK();
  134 
  135         free(pf, M_DEVBUF);
  136 }
  137 
  138 static int
  139 sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
  140 {
  141         struct sndstat_file *pf;
  142         int err;
  143         int len;
  144 
  145         err = devfs_get_cdevpriv((void **)&pf);
  146         if (err != 0)
  147                 return (err);
  148 
  149         /* skip zero-length reads */
  150         if (buf->uio_resid == 0)
  151                 return (0);
  152 
  153         SNDSTAT_LOCK();
  154         if (pf->out_offset != 0) {
  155                 /* don't allow both reading and writing */
  156                 err = EINVAL;
  157                 goto done;
  158         } else if (pf->in_offset == 0) {
  159                 err = sndstat_prepare(pf);
  160                 if (err <= 0) {
  161                         err = ENOMEM;
  162                         goto done;
  163                 }
  164         }
  165         len = sbuf_len(&pf->sbuf) - pf->in_offset;
  166         if (len > buf->uio_resid)
  167                 len = buf->uio_resid;
  168         if (len > 0)
  169                 err = uiomove(sbuf_data(&pf->sbuf) + pf->in_offset, len, buf);
  170         pf->in_offset += len;
  171 done:
  172         SNDSTAT_UNLOCK();
  173         return (err);
  174 }
  175 
  176 static int
  177 sndstat_write(struct cdev *i_dev, struct uio *buf, int flag)
  178 {
  179         struct sndstat_file *pf;
  180         uint8_t temp[64];
  181         int err;
  182         int len;
  183 
  184         err = devfs_get_cdevpriv((void **)&pf);
  185         if (err != 0)
  186                 return (err);
  187 
  188         /* skip zero-length writes */
  189         if (buf->uio_resid == 0)
  190                 return (0);
  191 
  192         /* don't allow writing more than 64Kbytes */
  193         if (buf->uio_resid > 65536)
  194                 return (ENOMEM);
  195 
  196         SNDSTAT_LOCK();
  197         if (pf->in_offset != 0) {
  198                 /* don't allow both reading and writing */
  199                 err = EINVAL;
  200         } else {
  201                 /* only remember the last write - allows for updates */
  202                 sbuf_clear(&pf->sbuf);
  203                 while (1) {
  204                         len = sizeof(temp);
  205                         if (len > buf->uio_resid)
  206                                 len = buf->uio_resid;
  207                         if (len > 0) {
  208                                 err = uiomove(temp, len, buf);
  209                                 if (err)
  210                                         break;
  211                         } else {
  212                                 break;
  213                         }
  214                         if (sbuf_bcat(&pf->sbuf, temp, len) < 0) {
  215                                 err = ENOMEM;
  216                                 break;
  217                         }
  218                 }
  219                 sbuf_finish(&pf->sbuf);
  220                 if (err == 0)
  221                         pf->out_offset = sbuf_len(&pf->sbuf);
  222                 else
  223                         pf->out_offset = 0;
  224         }
  225         SNDSTAT_UNLOCK();
  226         return (err);
  227 }
  228 
  229 /************************************************************************/
  230 
  231 int
  232 sndstat_register(device_t dev, char *str, sndstat_handler handler)
  233 {
  234         struct sndstat_entry *ent;
  235         struct sndstat_entry *pre;
  236         const char *devtype;
  237         int type, unit;
  238 
  239         if (dev) {
  240                 unit = device_get_unit(dev);
  241                 devtype = device_get_name(dev);
  242                 if (!strcmp(devtype, "pcm"))
  243                         type = SS_TYPE_PCM;
  244                 else if (!strcmp(devtype, "midi"))
  245                         type = SS_TYPE_MIDI;
  246                 else if (!strcmp(devtype, "sequencer"))
  247                         type = SS_TYPE_SEQUENCER;
  248                 else
  249                         return (EINVAL);
  250         } else {
  251                 type = SS_TYPE_MODULE;
  252                 unit = -1;
  253         }
  254 
  255         ent = malloc(sizeof *ent, M_DEVBUF, M_WAITOK | M_ZERO);
  256         ent->dev = dev;
  257         ent->str = str;
  258         ent->type = type;
  259         ent->unit = unit;
  260         ent->handler = handler;
  261 
  262         SNDSTAT_LOCK();
  263         /* sorted list insertion */
  264         TAILQ_FOREACH(pre, &sndstat_devlist, link) {
  265                 if (pre->unit > unit)
  266                         break;
  267                 else if (pre->unit < unit)
  268                         continue;
  269                 if (pre->type > type)
  270                         break;
  271                 else if (pre->type < unit)
  272                         continue;
  273         }
  274         if (pre == NULL) {
  275                 TAILQ_INSERT_TAIL(&sndstat_devlist, ent, link);
  276         } else {
  277                 TAILQ_INSERT_BEFORE(pre, ent, link);
  278         }
  279         SNDSTAT_UNLOCK();
  280 
  281         return (0);
  282 }
  283 
  284 int
  285 sndstat_registerfile(char *str)
  286 {
  287         return (sndstat_register(NULL, str, NULL));
  288 }
  289 
  290 int
  291 sndstat_unregister(device_t dev)
  292 {
  293         struct sndstat_entry *ent;
  294         int error = ENXIO;
  295 
  296         SNDSTAT_LOCK();
  297         TAILQ_FOREACH(ent, &sndstat_devlist, link) {
  298                 if (ent->dev == dev) {
  299                         TAILQ_REMOVE(&sndstat_devlist, ent, link);
  300                         free(ent, M_DEVBUF);
  301                         error = 0;
  302                         break;
  303                 }
  304         }
  305         SNDSTAT_UNLOCK();
  306 
  307         return (error);
  308 }
  309 
  310 int
  311 sndstat_unregisterfile(char *str)
  312 {
  313         struct sndstat_entry *ent;
  314         int error = ENXIO;
  315 
  316         SNDSTAT_LOCK();
  317         TAILQ_FOREACH(ent, &sndstat_devlist, link) {
  318                 if (ent->dev == NULL && ent->str == str) {
  319                         TAILQ_REMOVE(&sndstat_devlist, ent, link);
  320                         free(ent, M_DEVBUF);
  321                         error = 0;
  322                         break;
  323                 }
  324         }
  325         SNDSTAT_UNLOCK();
  326 
  327         return (error);
  328 }
  329 
  330 /************************************************************************/
  331 
  332 static int
  333 sndstat_prepare(struct sndstat_file *pf_self)
  334 {
  335         struct sbuf *s = &pf_self->sbuf;
  336         struct sndstat_entry *ent;
  337         struct snddev_info *d;
  338         struct sndstat_file *pf;
  339         int k;
  340 
  341         /* make sure buffer is reset */
  342         sbuf_clear(s);
  343         
  344         if (snd_verbose > 0) {
  345                 sbuf_printf(s, "FreeBSD Audio Driver (%ubit %d/%s)\n",
  346                     (u_int)sizeof(intpcm32_t) << 3, SND_DRV_VERSION,
  347                     MACHINE_ARCH);
  348         }
  349 
  350         /* generate list of installed devices */
  351         k = 0;
  352         TAILQ_FOREACH(ent, &sndstat_devlist, link) {
  353                 if (ent->dev == NULL)
  354                         continue;
  355                 d = device_get_softc(ent->dev);
  356                 if (!PCM_REGISTERED(d))
  357                         continue;
  358                 if (!k++)
  359                         sbuf_printf(s, "Installed devices:\n");
  360                 sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
  361                 sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
  362                 if (snd_verbose > 0)
  363                         sbuf_printf(s, " %s", ent->str);
  364                 if (ent->handler) {
  365                         /* XXX Need Giant magic entry ??? */
  366                         PCM_ACQUIRE_QUICK(d);
  367                         ent->handler(s, ent->dev, snd_verbose);
  368                         PCM_RELEASE_QUICK(d);
  369                 }
  370                 sbuf_printf(s, "\n");
  371         }
  372         if (k == 0)
  373                 sbuf_printf(s, "No devices installed.\n");
  374 
  375         /* append any input from userspace */
  376         k = 0;
  377         TAILQ_FOREACH(pf, &sndstat_filelist, entry) {
  378                 if (pf == pf_self)
  379                         continue;
  380                 if (pf->out_offset == 0)
  381                         continue;
  382                 if (!k++)
  383                         sbuf_printf(s, "Installed devices from userspace:\n");
  384                 sbuf_bcat(s, sbuf_data(&pf->sbuf),
  385                     sbuf_len(&pf->sbuf));
  386         }
  387         if (k == 0)
  388                 sbuf_printf(s, "No devices installed from userspace.\n");
  389 
  390         /* append any file versions */
  391         if (snd_verbose >= 3) {
  392                 k = 0;
  393                 TAILQ_FOREACH(ent, &sndstat_devlist, link) {
  394                         if (ent->dev == NULL && ent->str != NULL) {
  395                                 if (!k++)
  396                                         sbuf_printf(s, "\nFile Versions:\n");
  397                                 sbuf_printf(s, "%s\n", ent->str);
  398                         }
  399                 }
  400                 if (k == 0)
  401                         sbuf_printf(s, "\nNo file versions.\n");
  402         }
  403         sbuf_finish(s);
  404         return (sbuf_len(s));
  405 }
  406 
  407 static void
  408 sndstat_sysinit(void *p)
  409 {
  410         sx_init(&sndstat_lock, "sndstat lock");
  411         sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS,
  412             UID_ROOT, GID_WHEEL, 0644, "sndstat");
  413 }
  414 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
  415 
  416 static void
  417 sndstat_sysuninit(void *p)
  418 {
  419         if (sndstat_dev != NULL) {
  420                 /* destroy_dev() will wait for all references to go away */
  421                 destroy_dev(sndstat_dev);
  422         }
  423         sx_destroy(&sndstat_lock);
  424 }
  425 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);

Cache object: fd8c02d97679b0e0fe6acd230f952101


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