Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 <linux/platform_device.h>
20#include <asm/8253pit.h>
21#include <asm/io.h>
22
23MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
24MODULE_DESCRIPTION("PC Speaker beeper driver");
25MODULE_LICENSE("GPL");
26
27static DEFINE_SPINLOCK(i8253_beep_lock);
28
29static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
30{
31 unsigned int count = 0;
32 unsigned long flags;
33
34 if (type != EV_SND)
35 return -1;
36
37 switch (code) {
38 case SND_BELL: if (value) value = 1000;
39 case SND_TONE: break;
40 default: return -1;
41 }
42
43 if (value > 20 && value < 32767)
44 count = PIT_TICK_RATE / value;
45
46 spin_lock_irqsave(&i8253_beep_lock, flags);
47
48 if (count) {
49 /* enable counter 2 */
50 outb_p(inb_p(0x61) | 3, 0x61);
51 /* set command for counter 2, 2 byte write */
52 outb_p(0xB6, 0x43);
53 /* select desired HZ */
54 outb_p(count & 0xff, 0x42);
55 outb((count >> 8) & 0xff, 0x42);
56 } else {
57 /* disable counter 2 */
58 outb(inb_p(0x61) & 0xFC, 0x61);
59 }
60
61 spin_unlock_irqrestore(&i8253_beep_lock, flags);
62
63 return 0;
64}
65
66static int __devinit pcspkr_probe(struct platform_device *dev)
67{
68 struct input_dev *pcspkr_dev;
69 int err;
70
71 pcspkr_dev = input_allocate_device();
72 if (!pcspkr_dev)
73 return -ENOMEM;
74
75 pcspkr_dev->name = "PC Speaker";
76 pcspkr_dev->phys = "isa0061/input0";
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 pcspkr_dev->cdev.dev = &dev->dev;
82
83 pcspkr_dev->evbit[0] = BIT(EV_SND);
84 pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
85 pcspkr_dev->event = pcspkr_event;
86
87 err = input_register_device(pcspkr_dev);
88 if (err) {
89 input_free_device(pcspkr_dev);
90 return err;
91 }
92
93 platform_set_drvdata(dev, pcspkr_dev);
94
95 return 0;
96}
97
98static int __devexit pcspkr_remove(struct platform_device *dev)
99{
100 struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
101
102 input_unregister_device(pcspkr_dev);
103 platform_set_drvdata(dev, NULL);
104 /* turn off the speaker */
105 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
106
107 return 0;
108}
109
110static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
111{
112 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
113
114 return 0;
115}
116
117static void pcspkr_shutdown(struct platform_device *dev)
118{
119 /* turn off the speaker */
120 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
121}
122
123static struct platform_driver pcspkr_platform_driver = {
124 .driver = {
125 .name = "pcspkr",
126 .owner = THIS_MODULE,
127 },
128 .probe = pcspkr_probe,
129 .remove = __devexit_p(pcspkr_remove),
130 .suspend = pcspkr_suspend,
131 .shutdown = pcspkr_shutdown,
132};
133
134
135static int __init pcspkr_init(void)
136{
137 return platform_driver_register(&pcspkr_platform_driver);
138}
139
140static void __exit pcspkr_exit(void)
141{
142 platform_driver_unregister(&pcspkr_platform_driver);
143}
144
145module_init(pcspkr_init);
146module_exit(pcspkr_exit);