/* *  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 <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/input.h>#include <asm/8253pit.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; static DEFINE_SPINLOCK(i8253_beep_lock); 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 = PIT_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);	/* turn off the speaker */	pcspkr_event(NULL, EV_SND, SND_BELL, 0);} module_init(pcspkr_init);module_exit(pcspkr_exit);