drivers/input/misc/m68kspkr.c

   1 /*
   2  *  m68k beeper driver for Linux
   3  *
   4  *  Copyright (c) 2002 Richard Zidlicky
   5  *  Copyright (c) 2002 Vojtech Pavlik
   6  *  Copyright (c) 1992 Orest Zborowski
   7  *
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published by
  13  * the Free Software Foundation
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/input.h>
  20 #include <asm/machdep.h>
  21 #include <asm/io.h>
  22
  23 MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
  24 MODULE_DESCRIPTION("m68k beeper driver");
  25 MODULE_LICENSE("GPL");
  26
  27 static struct input_dev *m68kspkr_dev;
  28
  29 static int m68kspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  30 {
  31         unsigned int count = 0;
  32
  33         if (type != EV_SND)
  34                 return -1;
  35
  36         switch (code) {
  37                 case SND_BELL: if (value) value = 1000;
  38                 case SND_TONE: break;
  39                 default: return -1;
  40         }
  41
  42         if (value > 20 && value < 32767)
  43                 count = 1193182 / value;
  44
  45         mach_beep(count, -1);
  46
  47         return 0;
  48 }
  49
  50 static int __init m68kspkr_init(void)
  51 {
  52         if (!mach_beep) {
  53                 printk(KERN_INFO "m68kspkr: no lowlevel beep support\n");
  54                 return -ENODEV;
  55         }
  56
  57         m68kspkr_dev = input_allocate_device();
  58         if (!m68kspkr_dev)
  59                 return -ENOMEM;
  60
  61         m68kspkr_dev->name = "m68k beeper";
  62         m68kspkr_dev->phys = "m68k/generic";
  63         m68kspkr_dev->id.bustype = BUS_HOST;
  64         m68kspkr_dev->id.vendor = 0x001f;
  65         m68kspkr_dev->id.product = 0x0001;
  66         m68kspkr_dev->id.version = 0x0100;
  67
  68         m68kspkr_dev->evbit[0] = BIT(EV_SND);
  69         m68kspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  70         m68kspkr_dev->event = m68kspkr_event;
  71
  72         input_register_device(m68kspkr_dev);
  73
  74         return 0;
  75 }
  76
  77 static void __exit m68kspkr_exit(void)
  78 {
  79         input_unregister_device(m68kspkr_dev);
  80 }
  81
  82 module_init(m68kspkr_init);
  83 module_exit(m68kspkr_exit);