sound/drivers/pcsp/pcsp_input.c

   1 /*
   2  *  PC Speaker beeper driver for Linux
   3  *
   4  *  Copyright (c) 2002 Vojtech Pavlik
   5  *  Copyright (c) 1992 Orest Zborowski
   6  *
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/input.h>
  17 #include <asm/io.h>
  18 #include "pcsp.h"
  19
  20 static void pcspkr_do_sound(unsigned int count)
  21 {
  22         unsigned long flags;
  23
  24         spin_lock_irqsave(&i8253_lock, flags);
  25
  26         if (count) {
  27                 /* enable counter 2 */
  28                 outb_p(inb_p(0x61) | 3, 0x61);
  29                 /* set command for counter 2, 2 byte write */
  30                 outb_p(0xB6, 0x43);
  31                 /* select desired HZ */
  32                 outb_p(count & 0xff, 0x42);
  33                 outb((count >> 8) & 0xff, 0x42);
  34         } else {
  35                 /* disable counter 2 */
  36                 outb(inb_p(0x61) & 0xFC, 0x61);
  37         }
  38
  39         spin_unlock_irqrestore(&i8253_lock, flags);
  40 }
  41
  42 void pcspkr_stop_sound(void)
  43 {
  44         pcspkr_do_sound(0);
  45 }
  46
  47 static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
  48                               unsigned int code, int value)
  49 {
  50         unsigned int count = 0;
  51
  52         if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
  53                 return 0;
  54
  55         switch (type) {
  56         case EV_SND:
  57                 switch (code) {
  58                 case SND_BELL:
  59                         if (value)
  60                                 value = 1000;
  61                 case SND_TONE:
  62                         break;
  63                 default:
  64                         return -1;
  65                 }
  66                 break;
  67
  68         default:
  69                 return -1;
  70         }
  71
  72         if (value > 20 && value < 32767)
  73                 count = PIT_TICK_RATE / value;
  74
  75         pcspkr_do_sound(count);
  76
  77         return 0;
  78 }
  79
  80 int __devinit pcspkr_input_init(struct input_dev **rdev, struct device *dev)
  81 {
  82         int err;
  83
  84         struct input_dev *input_dev = input_allocate_device();
  85         if (!input_dev)
  86                 return -ENOMEM;
  87
  88         input_dev->name = "PC Speaker";
  89         input_dev->phys = "isa0061/input0";
  90         input_dev->id.bustype = BUS_ISA;
  91         input_dev->id.vendor = 0x001f;
  92         input_dev->id.product = 0x0001;
  93         input_dev->id.version = 0x0100;
  94         input_dev->dev.parent = dev;
  95
  96         input_dev->evbit[0] = BIT(EV_SND);
  97         input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  98         input_dev->event = pcspkr_input_event;
  99
 100         err = input_register_device(input_dev);
 101         if (err) {
 102                 input_free_device(input_dev);
 103                 return err;
 104         }
 105
 106         *rdev = input_dev;
 107         return 0;
 108 }
 109
 110 int pcspkr_input_remove(struct input_dev *dev)
 111 {
 112         pcspkr_stop_sound();
 113         input_unregister_device(dev);   /* this also does kfree() */
 114
 115         return 0;
 116 }