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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 494 | giacomo | 1 | /* |
| 2 | * PC Speaker beeper driver for Linux |
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| 3 | * |
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| 4 | * Copyright (c) 2002 Vojtech Pavlik |
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| 5 | * Copyright (c) 1992 Orest Zborowski |
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| 6 | * |
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| 7 | */ |
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| 8 | |||
| 9 | /* |
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| 10 | * This program is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License version 2 as published by |
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| 12 | * the Free Software Foundation |
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| 13 | */ |
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| 14 | |||
| 15 | #include <linuxcomp.h> |
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| 16 | |||
| 17 | #include <linux/kernel.h> |
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| 18 | #include <linux/module.h> |
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| 19 | #include <linux/init.h> |
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| 20 | #include <linux/input.h> |
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| 21 | #include <asm/io.h> |
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| 22 | |||
| 23 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
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| 24 | MODULE_DESCRIPTION("PC Speaker beeper driver"); |
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| 25 | MODULE_LICENSE("GPL"); |
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| 26 | |||
| 27 | static char pcspkr_name[] = "PC Speaker"; |
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| 28 | static char pcspkr_phys[] = "isa0061/input0"; |
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| 29 | static struct input_dev pcspkr_dev; |
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| 30 | |||
| 31 | spinlock_t i8253_beep_lock = SPIN_LOCK_UNLOCKED; |
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| 32 | |||
| 33 | static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
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| 34 | { |
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| 35 | unsigned int count = 0; |
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| 36 | unsigned long flags; |
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| 37 | |||
| 38 | if (type != EV_SND) |
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| 39 | return -1; |
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| 40 | |||
| 41 | switch (code) { |
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| 42 | case SND_BELL: if (value) value = 1000; |
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| 43 | case SND_TONE: break; |
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| 44 | default: return -1; |
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| 45 | } |
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| 46 | |||
| 47 | if (value > 20 && value < 32767) |
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| 48 | count = CLOCK_TICK_RATE / value; |
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| 49 | |||
| 50 | spin_lock_irqsave(&i8253_beep_lock, flags); |
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| 51 | |||
| 52 | if (count) { |
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| 53 | /* enable counter 2 */ |
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| 54 | outb_p(inb_p(0x61) | 3, 0x61); |
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| 55 | /* set command for counter 2, 2 byte write */ |
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| 56 | outb_p(0xB6, 0x43); |
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| 57 | /* select desired HZ */ |
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| 58 | outb_p(count & 0xff, 0x42); |
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| 59 | outb((count >> 8) & 0xff, 0x42); |
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| 60 | } else { |
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| 61 | /* disable counter 2 */ |
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| 62 | outb(inb_p(0x61) & 0xFC, 0x61); |
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| 63 | } |
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| 64 | |||
| 65 | spin_unlock_irqrestore(&i8253_beep_lock, flags); |
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| 66 | |||
| 67 | return 0; |
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| 68 | } |
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| 69 | |||
| 70 | /*static*/ int __init pcspkr_init(void) |
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| 71 | { |
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| 72 | pcspkr_dev.evbit[0] = BIT(EV_SND); |
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| 73 | pcspkr_dev.sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); |
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| 74 | pcspkr_dev.event = pcspkr_event; |
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| 75 | |||
| 76 | pcspkr_dev.name = pcspkr_name; |
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| 77 | pcspkr_dev.phys = pcspkr_phys; |
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| 78 | pcspkr_dev.id.bustype = BUS_ISA; |
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| 79 | pcspkr_dev.id.vendor = 0x001f; |
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| 80 | pcspkr_dev.id.product = 0x0001; |
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| 81 | pcspkr_dev.id.version = 0x0100; |
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| 82 | |||
| 83 | input_register_device(&pcspkr_dev); |
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| 84 | |||
| 85 | printk(KERN_INFO "input: %s\n", pcspkr_name); |
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| 86 | |||
| 87 | return 0; |
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| 88 | } |
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| 89 | |||
| 90 | /*static*/ void __exit pcspkr_exit(void) |
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| 91 | { |
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| 92 | input_unregister_device(&pcspkr_dev); |
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| 93 | } |
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| 94 | |||
| 95 | module_init(pcspkr_init); |
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| 96 | module_exit(pcspkr_exit); |