pcspkr.c
2.92 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
* PC Speaker beeper driver for Linux
*
* Copyright (c) 2002 Vojtech Pavlik
* Copyright (c) 1992 Orest Zborowski
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i8253.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/timex.h>
#include <asm/io.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("PC Speaker beeper driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcspkr");
static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
unsigned int count = 0;
unsigned long flags;
if (type != EV_SND)
return -1;
switch (code) {
case SND_BELL: if (value) value = 1000;
case SND_TONE: break;
default: return -1;
}
if (value > 20 && value < 32767)
count = PIT_TICK_RATE / value;
raw_spin_lock_irqsave(&i8253_lock, flags);
if (count) {
/* set command for counter 2, 2 byte write */
outb_p(0xB6, 0x43);
/* select desired HZ */
outb_p(count & 0xff, 0x42);
outb((count >> 8) & 0xff, 0x42);
/* enable counter 2 */
outb_p(inb_p(0x61) | 3, 0x61);
} else {
/* disable counter 2 */
outb(inb_p(0x61) & 0xFC, 0x61);
}
raw_spin_unlock_irqrestore(&i8253_lock, flags);
return 0;
}
static int pcspkr_probe(struct platform_device *dev)
{
struct input_dev *pcspkr_dev;
int err;
pcspkr_dev = input_allocate_device();
if (!pcspkr_dev)
return -ENOMEM;
pcspkr_dev->name = "PC Speaker";
pcspkr_dev->phys = "isa0061/input0";
pcspkr_dev->id.bustype = BUS_ISA;
pcspkr_dev->id.vendor = 0x001f;
pcspkr_dev->id.product = 0x0001;
pcspkr_dev->id.version = 0x0100;
pcspkr_dev->dev.parent = &dev->dev;
pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
pcspkr_dev->event = pcspkr_event;
err = input_register_device(pcspkr_dev);
if (err) {
input_free_device(pcspkr_dev);
return err;
}
platform_set_drvdata(dev, pcspkr_dev);
return 0;
}
static int pcspkr_remove(struct platform_device *dev)
{
struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
input_unregister_device(pcspkr_dev);
/* turn off the speaker */
pcspkr_event(NULL, EV_SND, SND_BELL, 0);
return 0;
}
static int pcspkr_suspend(struct device *dev)
{
pcspkr_event(NULL, EV_SND, SND_BELL, 0);
return 0;
}
static void pcspkr_shutdown(struct platform_device *dev)
{
/* turn off the speaker */
pcspkr_event(NULL, EV_SND, SND_BELL, 0);
}
static const struct dev_pm_ops pcspkr_pm_ops = {
.suspend = pcspkr_suspend,
};
static struct platform_driver pcspkr_platform_driver = {
.driver = {
.name = "pcspkr",
.owner = THIS_MODULE,
.pm = &pcspkr_pm_ops,
},
.probe = pcspkr_probe,
.remove = pcspkr_remove,
.shutdown = pcspkr_shutdown,
};
module_platform_driver(pcspkr_platform_driver);