906bf5e8de89c568f243a7656fc82a3e93d8319c
[linux-2.6.git] / drivers / input / misc / pcspkr.c
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
23 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
24 MODULE_DESCRIPTION("PC Speaker beeper driver");
25 MODULE_LICENSE("GPL");
26
27 #ifdef CONFIG_X86
28 /* Use the global PIT lock ! */
29 #include <asm/i8253.h>
30 #else
31 static DEFINE_SPINLOCK(i8253_lock);
32 #endif
33
34 static 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
71 static 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
103 static 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
115 static 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
122 static void pcspkr_shutdown(struct platform_device *dev)
123 {
124         /* turn off the speaker */
125         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
126 }
127
128 static 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
140 static int __init pcspkr_init(void)
141 {
142         return platform_driver_register(&pcspkr_platform_driver);
143 }
144
145 static void __exit pcspkr_exit(void)
146 {
147         platform_driver_unregister(&pcspkr_platform_driver);
148 }
149
150 module_init(pcspkr_init);
151 module_exit(pcspkr_exit);