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494 giacomo 1
/*
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 *  PC Speaker beeper driver for Linux
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 *
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 *  Copyright (c) 2002 Vojtech Pavlik
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 *  Copyright (c) 1992 Orest Zborowski
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 *
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 */
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/*
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 * This program is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 as published by
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 * the Free Software Foundation
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 */
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#include <linuxcomp.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <asm/io.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("PC Speaker beeper driver");
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MODULE_LICENSE("GPL");
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static char pcspkr_name[] = "PC Speaker";
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static char pcspkr_phys[] = "isa0061/input0";
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static struct input_dev pcspkr_dev;
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spinlock_t i8253_beep_lock = SPIN_LOCK_UNLOCKED;
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static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
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{
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        unsigned int count = 0;
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        unsigned long flags;
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        if (type != EV_SND)
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                return -1;
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        switch (code) {
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                case SND_BELL: if (value) value = 1000;
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                case SND_TONE: break;
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                default: return -1;
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        }
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        if (value > 20 && value < 32767)
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                count = CLOCK_TICK_RATE / value;
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        spin_lock_irqsave(&i8253_beep_lock, flags);
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        if (count) {
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                /* enable counter 2 */
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                outb_p(inb_p(0x61) | 3, 0x61);
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                /* set command for counter 2, 2 byte write */
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                outb_p(0xB6, 0x43);
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                /* select desired HZ */
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                outb_p(count & 0xff, 0x42);
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                outb((count >> 8) & 0xff, 0x42);
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        } else {
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                /* disable counter 2 */
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                outb(inb_p(0x61) & 0xFC, 0x61);
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        }
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        spin_unlock_irqrestore(&i8253_beep_lock, flags);
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        return 0;
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}
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/*static*/ int __init pcspkr_init(void)
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{
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        pcspkr_dev.evbit[0] = BIT(EV_SND);
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        pcspkr_dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
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        pcspkr_dev.event = pcspkr_event;
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        pcspkr_dev.name = pcspkr_name;
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        pcspkr_dev.phys = pcspkr_phys;
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        pcspkr_dev.id.bustype = BUS_ISA;
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        pcspkr_dev.id.vendor = 0x001f;
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        pcspkr_dev.id.product = 0x0001;
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        pcspkr_dev.id.version = 0x0100;
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        input_register_device(&pcspkr_dev);
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        printk(KERN_INFO "input: %s\n", pcspkr_name);
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        return 0;
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}
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/*static*/ void __exit pcspkr_exit(void)
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{
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        input_unregister_device(&pcspkr_dev);
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}
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module_init(pcspkr_init);
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module_exit(pcspkr_exit);