projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 76b7cddf | 26 | static struct input_dev *pcspkr_dev; |
| 1da177e4 LT |
27 | |
| 28 | static DEFINE_SPINLOCK(i8253_beep_lock); | |
| 29 | ||
| 30 | static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) | |
| 31 | { | |
| 32 | unsigned int count = 0; | |
| 33 | unsigned long flags; | |
| 34 | ||
| 35 | if (type != EV_SND) | |
| 36 | return -1; | |
| 37 | ||
| 38 | switch (code) { | |
| 39 | case SND_BELL: if (value) value = 1000; | |
| 40 | case SND_TONE: break; | |
| 41 | default: return -1; | |
| 42 | } | |
| 43 | ||
| 44 | if (value > 20 && value < 32767) | |
| 45 | count = PIT_TICK_RATE / value; | |
| 46 | ||
| 47 | spin_lock_irqsave(&i8253_beep_lock, flags); | |
| 48 | ||
| 49 | if (count) { | |
| 50 | /* enable counter 2 */ | |
| 51 | outb_p(inb_p(0x61) | 3, 0x61); | |
| 52 | /* set command for counter 2, 2 byte write */ | |
| 53 | outb_p(0xB6, 0x43); | |
| 54 | /* select desired HZ */ | |
| 55 | outb_p(count & 0xff, 0x42); | |
| 56 | outb((count >> 8) & 0xff, 0x42); | |
| 57 | } else { | |
| 58 | /* disable counter 2 */ | |
| 59 | outb(inb_p(0x61) & 0xFC, 0x61); | |
| 60 | } | |
| 61 | ||
| 62 | spin_unlock_irqrestore(&i8253_beep_lock, flags); | |
| 63 | ||
| 64 | return 0; | |
| 65 | } | |
| 66 | ||
| 67 | static int __init pcspkr_init(void) | |
| 68 | { | |
| 76b7cddf DT |
69 | pcspkr_dev = input_allocate_device(); |
| 70 | if (!pcspkr_dev) | |
| 71 | return -ENOMEM; | |
| 1da177e4 | 72 | |
| 76b7cddf | 73 | pcspkr_dev->name = "PC Speaker"; |
| 1259f2b3 | 74 | pcspkr_dev->phys = "isa0061/input0"; |
| 76b7cddf DT |
75 | pcspkr_dev->id.bustype = BUS_ISA; |
| 76 | pcspkr_dev->id.vendor = 0x001f; | |
| 77 | pcspkr_dev->id.product = 0x0001; | |
| 78 | pcspkr_dev->id.version = 0x0100; | |
| 1da177e4 | 79 | |
| 76b7cddf DT |
80 | pcspkr_dev->evbit[0] = BIT(EV_SND); |
| 81 | pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); | |
| 82 | pcspkr_dev->event = pcspkr_event; | |
| 1da177e4 | 83 | |
| 76b7cddf | 84 | input_register_device(pcspkr_dev); |
| 1da177e4 LT |
85 | |
| 86 | return 0; | |
| 87 | } | |
| 88 | ||
| 89 | static void __exit pcspkr_exit(void) | |
| 90 | { | |
| 76b7cddf | 91 | input_unregister_device(pcspkr_dev); |
| 1da177e4 LT |
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); |