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/*
 *  PC Speaker beeper driver for Linux
 *
 *  Copyright (c) 2002 Vojtech Pavlik
 *  Copyright (c) 1992 Orest Zborowski
 *
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation
 */

#include <linuxcomp.h>

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <asm/io.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("PC Speaker beeper driver");
MODULE_LICENSE("GPL");

static char pcspkr_name[] = "PC Speaker";
static char pcspkr_phys[] = "isa0061/input0";
static struct input_dev pcspkr_dev;

spinlock_t i8253_beep_lock = SPIN_LOCK_UNLOCKED;

static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
        unsigned int count = 0;
        unsigned long flags;

        if (type != EV_SND)
                return -1;

        switch (code) {
                case SND_BELL: if (value) value = 1000;
                case SND_TONE: break;
                default: return -1;
        }

        if (value > 20 && value < 32767)
                count = CLOCK_TICK_RATE / value;
       
        spin_lock_irqsave(&i8253_beep_lock, flags);

        if (count) {
                /* enable counter 2 */
                outb_p(inb_p(0x61) | 3, 0x61);
                /* set command for counter 2, 2 byte write */
                outb_p(0xB6, 0x43);
                /* select desired HZ */
                outb_p(count & 0xff, 0x42);
                outb((count >> 8) & 0xff, 0x42);
        } else {
                /* disable counter 2 */
                outb(inb_p(0x61) & 0xFC, 0x61);
        }

        spin_unlock_irqrestore(&i8253_beep_lock, flags);

        return 0;
}

/*static*/ int __init pcspkr_init(void)
{
        pcspkr_dev.evbit[0] = BIT(EV_SND);
        pcspkr_dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
        pcspkr_dev.event = pcspkr_event;

        pcspkr_dev.name = pcspkr_name;
        pcspkr_dev.phys = pcspkr_phys;
        pcspkr_dev.id.bustype = BUS_ISA;
        pcspkr_dev.id.vendor = 0x001f;
        pcspkr_dev.id.product = 0x0001;
        pcspkr_dev.id.version = 0x0100;

        input_register_device(&pcspkr_dev);

        //printk(KERN_INFO "input: %s\n", pcspkr_name);

        return 0;
}

/*static*/ void __exit pcspkr_exit(void)
{
        input_unregister_device(&pcspkr_dev);
}

module_init(pcspkr_init);
module_exit(pcspkr_exit);