f080dd31499bbe21ed509b46559ad2219546a5a4
[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 <linux/timex.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 MODULE_ALIAS("platform:pcspkr");
27
28 #if defined(CONFIG_MIPS) || defined(CONFIG_X86)
29 /* Use the global PIT lock ! */
30 #include <asm/i8253.h>
31 #else
32 #include <asm/8253pit.h>
33 static DEFINE_RAW_SPINLOCK(i8253_lock);
34 #endif
35
36 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
37 {
38         unsigned int count = 0;
39         unsigned long flags;
40
41         if (type != EV_SND)
42                 return -1;
43
44         switch (code) {
45                 case SND_BELL: if (value) value = 1000;
46                 case SND_TONE: break;
47                 default: return -1;
48         }
49
50         if (value > 20 && value < 32767)
51                 count = PIT_TICK_RATE / value;
52
53         raw_spin_lock_irqsave(&i8253_lock, flags);
54
55         if (count) {
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                 /* enable counter 2 */
62                 outb_p(inb_p(0x61) | 3, 0x61);
63         } else {
64                 /* disable counter 2 */
65                 outb(inb_p(0x61) & 0xFC, 0x61);
66         }
67
68         raw_spin_unlock_irqrestore(&i8253_lock, flags);
69
70         return 0;
71 }
72
73 static int __devinit pcspkr_probe(struct platform_device *dev)
74 {
75         struct input_dev *pcspkr_dev;
76         int err;
77
78         pcspkr_dev = input_allocate_device();
79         if (!pcspkr_dev)
80                 return -ENOMEM;
81
82         pcspkr_dev->name = "PC Speaker";
83         pcspkr_dev->phys = "isa0061/input0";
84         pcspkr_dev->id.bustype = BUS_ISA;
85         pcspkr_dev->id.vendor = 0x001f;
86         pcspkr_dev->id.product = 0x0001;
87         pcspkr_dev->id.version = 0x0100;
88         pcspkr_dev->dev.parent = &dev->dev;
89
90         pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
91         pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
92         pcspkr_dev->event = pcspkr_event;
93
94         err = input_register_device(pcspkr_dev);
95         if (err) {
96                 input_free_device(pcspkr_dev);
97                 return err;
98         }
99
100         platform_set_drvdata(dev, pcspkr_dev);
101
102         return 0;
103 }
104
105 static int __devexit pcspkr_remove(struct platform_device *dev)
106 {
107         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
108
109         input_unregister_device(pcspkr_dev);
110         platform_set_drvdata(dev, NULL);
111         /* turn off the speaker */
112         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
113
114         return 0;
115 }
116
117 static int pcspkr_suspend(struct device *dev)
118 {
119         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
120
121         return 0;
122 }
123
124 static void pcspkr_shutdown(struct platform_device *dev)
125 {
126         /* turn off the speaker */
127         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
128 }
129
130 static const struct dev_pm_ops pcspkr_pm_ops = {
131         .suspend = pcspkr_suspend,
132 };
133
134 static struct platform_driver pcspkr_platform_driver = {
135         .driver         = {
136                 .name   = "pcspkr",
137                 .owner  = THIS_MODULE,
138                 .pm     = &pcspkr_pm_ops,
139         },
140         .probe          = pcspkr_probe,
141         .remove         = __devexit_p(pcspkr_remove),
142         .shutdown       = pcspkr_shutdown,
143 };
144
145
146 static int __init pcspkr_init(void)
147 {
148         return platform_driver_register(&pcspkr_platform_driver);
149 }
150
151 static void __exit pcspkr_exit(void)
152 {
153         platform_driver_unregister(&pcspkr_platform_driver);
154 }
155
156 module_init(pcspkr_init);
157 module_exit(pcspkr_exit);