tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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
27#ifdef CONFIG_X86
28/* Use the global PIT lock ! */
29#include <asm/i8253.h>
30#else
31static DEFINE_SPINLOCK(i8253_lock);
32#endif
33
34static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
35{
36 unsigned int count = 0;
37 unsigned long flags;
38
39 if (type != EV_SND)
40 return -1;
41
42 switch (code) {
43 case SND_BELL: if (value) value = 1000;
44 case SND_TONE: break;
45 default: return -1;
46 }
47
48 if (value > 20 && value < 32767)
49 count = PIT_TICK_RATE / value;
50
51 spin_lock_irqsave(&i8253_lock, flags);
52
53 if (count) {
54 /* enable counter 2 */
55 outb_p(inb_p(0x61) | 3, 0x61);
56 /* set command for counter 2, 2 byte write */
57 outb_p(0xB6, 0x43);
58 /* select desired HZ */
59 outb_p(count & 0xff, 0x42);
60 outb((count >> 8) & 0xff, 0x42);
61 } else {
62 /* disable counter 2 */
63 outb(inb_p(0x61) & 0xFC, 0x61);
64 }
65
66 spin_unlock_irqrestore(&i8253_lock, flags);
67
68 return 0;
69}
70
71static int __devinit pcspkr_probe(struct platform_device *dev)
72{
73 struct input_dev *pcspkr_dev;
74 int err;
75
76 pcspkr_dev = input_allocate_device();
77 if (!pcspkr_dev)
78 return -ENOMEM;
79
80 pcspkr_dev->name = "PC Speaker";
81 pcspkr_dev->phys = "isa0061/input0";
82 pcspkr_dev->id.bustype = BUS_ISA;
83 pcspkr_dev->id.vendor = 0x001f;
84 pcspkr_dev->id.product = 0x0001;
85 pcspkr_dev->id.version = 0x0100;
86 pcspkr_dev->dev.parent = &dev->dev;
87
88 pcspkr_dev->evbit[0] = BIT(EV_SND);
89 pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
90 pcspkr_dev->event = pcspkr_event;
91
92 err = input_register_device(pcspkr_dev);
93 if (err) {
94 input_free_device(pcspkr_dev);
95 return err;
96 }
97
98 platform_set_drvdata(dev, pcspkr_dev);
99
100 return 0;
101}
102
103static int __devexit pcspkr_remove(struct platform_device *dev)
104{
105 struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
106
107 input_unregister_device(pcspkr_dev);
108 platform_set_drvdata(dev, NULL);
109 /* turn off the speaker */
110 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
111
112 return 0;
113}
114
115static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
116{
117 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
118
119 return 0;
120}
121
122static void pcspkr_shutdown(struct platform_device *dev)
123{
124 /* turn off the speaker */
125 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
126}
127
128static struct platform_driver pcspkr_platform_driver = {
129 .driver = {
130 .name = "pcspkr",
131 .owner = THIS_MODULE,
132 },
133 .probe = pcspkr_probe,
134 .remove = __devexit_p(pcspkr_remove),
135 .suspend = pcspkr_suspend,
136 .shutdown = pcspkr_shutdown,
137};
138
139
140static int __init pcspkr_init(void)
141{
142 return platform_driver_register(&pcspkr_platform_driver);
143}
144
145static void __exit pcspkr_exit(void)
146{
147 platform_driver_unregister(&pcspkr_platform_driver);
148}
149
150module_init(pcspkr_init);
151module_exit(pcspkr_exit);