| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |