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/io.h>
21
22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23MODULE_DESCRIPTION("PC Speaker beeper driver");
24MODULE_LICENSE("GPL");
25MODULE_ALIAS("platform:pcspkr");
26
27#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
28/* Use the global PIT lock ! */
29#include <asm/i8253.h>
30#else
31#include <asm/8253pit.h>
32static DEFINE_SPINLOCK(i8253_lock);
33#endif
34
35static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
36{
37 unsigned int count = 0;
38 unsigned long flags;
39
40 if (type != EV_SND)
41 return -1;
42
43 switch (code) {
44 case SND_BELL: if (value) value = 1000;
45 case SND_TONE: break;
46 default: return -1;
47 }
48
49 if (value > 20 && value < 32767)
50 count = PIT_TICK_RATE / value;
51
52 spin_lock_irqsave(&i8253_lock, flags);
53
54 if (count) {
55 /* enable counter 2 */
56 outb_p(inb_p(0x61) | 3, 0x61);
57 /* set command for counter 2, 2 byte write */
58 outb_p(0xB6, 0x43);
59 /* select desired HZ */
60 outb_p(count & 0xff, 0x42);
61 outb((count >> 8) & 0xff, 0x42);
62 } else {
63 /* disable counter 2 */
64 outb(inb_p(0x61) & 0xFC, 0x61);
65 }
66
67 spin_unlock_irqrestore(&i8253_lock, flags);
68
69 return 0;
70}
71
72static int __devinit pcspkr_probe(struct platform_device *dev)
73{
74 struct input_dev *pcspkr_dev;
75 int err;
76
77 pcspkr_dev = input_allocate_device();
78 if (!pcspkr_dev)
79 return -ENOMEM;
80
81 pcspkr_dev->name = "PC Speaker";
82 pcspkr_dev->phys = "isa0061/input0";
83 pcspkr_dev->id.bustype = BUS_ISA;
84 pcspkr_dev->id.vendor = 0x001f;
85 pcspkr_dev->id.product = 0x0001;
86 pcspkr_dev->id.version = 0x0100;
87 pcspkr_dev->dev.parent = &dev->dev;
88
89 pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
90 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
91 pcspkr_dev->event = pcspkr_event;
92
93 err = input_register_device(pcspkr_dev);
94 if (err) {
95 input_free_device(pcspkr_dev);
96 return err;
97 }
98
99 platform_set_drvdata(dev, pcspkr_dev);
100
101 return 0;
102}
103
104static int __devexit pcspkr_remove(struct platform_device *dev)
105{
106 struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
107
108 input_unregister_device(pcspkr_dev);
109 platform_set_drvdata(dev, NULL);
110 /* turn off the speaker */
111 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
112
113 return 0;
114}
115
116static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
117{
118 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
119
120 return 0;
121}
122
123static void pcspkr_shutdown(struct platform_device *dev)
124{
125 /* turn off the speaker */
126 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
127}
128
129static struct platform_driver pcspkr_platform_driver = {
130 .driver = {
131 .name = "pcspkr",
132 .owner = THIS_MODULE,
133 },
134 .probe = pcspkr_probe,
135 .remove = __devexit_p(pcspkr_remove),
136 .suspend = pcspkr_suspend,
137 .shutdown = pcspkr_shutdown,
138};
139
140
141static int __init pcspkr_init(void)
142{
143 return platform_driver_register(&pcspkr_platform_driver);
144}
145
146static void __exit pcspkr_exit(void)
147{
148 platform_driver_unregister(&pcspkr_platform_driver);
149}
150
151module_init(pcspkr_init);
152module_exit(pcspkr_exit);