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/kernel.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/input.h> 19 #include <asm/8253pit.h> 20 #include <asm/io.h> 21 22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 23 MODULE_DESCRIPTION("PC Speaker beeper driver"); 24 MODULE_LICENSE("GPL"); 25 26 static char pcspkr_name[] = "PC Speaker"; 27 static char pcspkr_phys[] = "isa0061/input0"; 28 static struct input_dev pcspkr_dev; 29 30 static DEFINE_SPINLOCK(i8253_beep_lock); 31 32 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 33 { 34 unsigned int count = 0; 35 unsigned long flags; 36 37 if (type != EV_SND) 38 return -1; 39 40 switch (code) { 41 case SND_BELL: if (value) value = 1000; 42 case SND_TONE: break; 43 default: return -1; 44 } 45 46 if (value > 20 && value < 32767) 47 count = PIT_TICK_RATE / value; 48 49 spin_lock_irqsave(&i8253_beep_lock, flags); 50 51 if (count) { 52 /* enable counter 2 */ 53 outb_p(inb_p(0x61) | 3, 0x61); 54 /* set command for counter 2, 2 byte write */ 55 outb_p(0xB6, 0x43); 56 /* select desired HZ */ 57 outb_p(count & 0xff, 0x42); 58 outb((count >> 8) & 0xff, 0x42); 59 } else { 60 /* disable counter 2 */ 61 outb(inb_p(0x61) & 0xFC, 0x61); 62 } 63 64 spin_unlock_irqrestore(&i8253_beep_lock, flags); 65 66 return 0; 67 } 68 69 static int __init pcspkr_init(void) 70 { 71 pcspkr_dev.evbit[0] = BIT(EV_SND); 72 pcspkr_dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 73 pcspkr_dev.event = pcspkr_event; 74 75 pcspkr_dev.name = pcspkr_name; 76 pcspkr_dev.phys = pcspkr_phys; 77 pcspkr_dev.id.bustype = BUS_ISA; 78 pcspkr_dev.id.vendor = 0x001f; 79 pcspkr_dev.id.product = 0x0001; 80 pcspkr_dev.id.version = 0x0100; 81 82 input_register_device(&pcspkr_dev); 83 84 printk(KERN_INFO "input: %s\n", pcspkr_name); 85 86 return 0; 87 } 88 89 static void __exit pcspkr_exit(void) 90 { 91 input_unregister_device(&pcspkr_dev); 92 /* turn off the speaker */ 93 pcspkr_event(NULL, EV_SND, SND_BELL, 0); 94 } 95 96 module_init(pcspkr_init); 97 module_exit(pcspkr_exit); 98