linux/sound/drivers/pcsp/pcsp_input.c
<<
>>
Prefs
   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
  20static 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                /* set command for counter 2, 2 byte write */
  28                outb_p(0xB6, 0x43);
  29                /* select desired HZ */
  30                outb_p(count & 0xff, 0x42);
  31                outb((count >> 8) & 0xff, 0x42);
  32                /* enable counter 2 */
  33                outb_p(inb_p(0x61) | 3, 0x61);
  34        } else {
  35                /* disable counter 2 */
  36                outb(inb_p(0x61) & 0xFC, 0x61);
  37        }
  38
  39        spin_unlock_irqrestore(&i8253_lock, flags);
  40}
  41
  42void pcspkr_stop_sound(void)
  43{
  44        pcspkr_do_sound(0);
  45}
  46
  47static 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
  80int __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
 110int 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}
 117