root/kern/dev/generic/beep.c

DEFINITIONS

1. config_beep
2. beep

   1 /*
   2  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
   3  *      The President and Fellows of Harvard College.
   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  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <types.h>
  31 #include <kern/errno.h>
  32 #include <lib.h>
  33 #include <generic/beep.h>
  34 #include "autoconf.h"
  36 /*
  37  * Machine-independent generic beep "device".
  38  *
  39  * Basically, all we do is remember something that can be used for
  40  * beeping, and provide the beep() function to the rest of the kernel.
  41  *
  42  * The kernel config mechanism can be used to explicitly choose which
  43  * of the available beeping devices to use, if more than one is
  44  * available.
  45  */
  47 static struct beep_softc *the_beep = NULL;
  49 int
  50 config_beep(struct beep_softc *bs, int unit)
  51 {
  52         /* We use only the first beep device. */
  53         if (unit!=0) {
  54                 return ENODEV;
  55         }
KASSERT(the_beep==NULL);
the_beep = bs;
  59         return 0;
  60 }
  62 void
beep(void)
  64 {
  65         if (the_beep!=NULL) {
the_beep->bs_beep(the_beep->bs_devdata);
  67         }
  68         else {
kprintf("beep: Warning: no beep device\n");
  70         }
  71 }