LXR linux/sound/drivers/pcsp/pcsp

   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 <linux/io.h>
  18#include "pcsp.h"
  19#include "pcsp_input.h"
  20
  21static void pcspkr_do_sound(unsigned int count)
  22{
  23        unsigned long flags;
  24
  25        raw_spin_lock_irqsave(&i8253_lock, flags);
  26
  27        if (count) {
  28                /* set command for counter 2, 2 byte write */
  29                outb_p(0xB6, 0x43);
  30                /* select desired HZ */
  31                outb_p(count & 0xff, 0x42);
  32                outb((count >> 8) & 0xff, 0x42);
  33                /* enable counter 2 */
  34                outb_p(inb_p(0x61) | 3, 0x61);
  35        } else {
  36                /* disable counter 2 */
  37                outb(inb_p(0x61) & 0xFC, 0x61);
  38        }
  39
  40        raw_spin_unlock_irqrestore(&i8253_lock, flags);
  41}
  42
  43void pcspkr_stop_sound(void)
  44{
  45        pcspkr_do_sound(0);
  46}
  47
  48static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
  49                              unsigned int code, int value)
  50{
  51        unsigned int count = 0;
  52
  53        if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
  54                return 0;
  55
  56        switch (type) {
  57        case EV_SND:
  58                switch (code) {
  59                case SND_BELL:
  60                        if (value)
  61                                value = 1000;
  62                case SND_TONE:
  63                        break;
  64                default:
  65                        return -1;
  66                }
  67                break;
  68
  69        default:
  70                return -1;
  71        }
  72
  73        if (value > 20 && value < 32767)
  74                count = PIT_TICK_RATE / value;
  75
  76        pcspkr_do_sound(count);
  77
  78        return 0;
  79}
  80
  81int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
  82{
  83        int err;
  84
  85        struct input_dev *input_dev = input_allocate_device();
  86        if (!input_dev)
  87                return -ENOMEM;
  88
  89        input_dev->name = "PC Speaker";
  90        input_dev->phys = "isa0061/input0";
  91        input_dev->id.bustype = BUS_ISA;
  92        input_dev->id.vendor = 0x001f;
  93        input_dev->id.product = 0x0001;
  94        input_dev->id.version = 0x0100;
  95        input_dev->dev.parent = dev;
  96
  97        input_dev->evbit[0] = BIT(EV_SND);
  98        input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
  99        input_dev->event = pcspkr_input_event;
 100
 101        err = input_register_device(input_dev);
 102        if (err) {
 103                input_free_device(input_dev);
 104                return err;
 105        }
 106
 107        *rdev = input_dev;
 108        return 0;
 109}
 110
 111int pcspkr_input_remove(struct input_dev *dev)
 112{
 113        pcspkr_stop_sound();
 114        input_unregister_device(dev);   /* this also does kfree() */
 115
 116        return 0;
 117}
 118