Input: pcspkr - separate device and driver registration
[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 static DEFINE_SPINLOCK(i8253_beep_lock);
28
29 static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
30 {
31         unsigned int count = 0;
32         unsigned long flags;
33
34         if (type != EV_SND)
35                 return -1;
36
37         switch (code) {
38                 case SND_BELL: if (value) value = 1000;
39                 case SND_TONE: break;
40                 default: return -1;
41         }
42
43         if (value > 20 && value < 32767)
44                 count = PIT_TICK_RATE / value;
45
46         spin_lock_irqsave(&i8253_beep_lock, flags);
47
48         if (count) {
49                 /* enable counter 2 */
50                 outb_p(inb_p(0x61) | 3, 0x61);
51                 /* set command for counter 2, 2 byte write */
52                 outb_p(0xB6, 0x43);
53                 /* select desired HZ */
54                 outb_p(count & 0xff, 0x42);
55                 outb((count >> 8) & 0xff, 0x42);
56         } else {
57                 /* disable counter 2 */
58                 outb(inb_p(0x61) & 0xFC, 0x61);
59         }
60
61         spin_unlock_irqrestore(&i8253_beep_lock, flags);
62
63         return 0;
64 }
65
66 static int __devinit pcspkr_probe(struct platform_device *dev)
67 {
68         struct input_dev *pcspkr_dev;
69         int err;
70
71         pcspkr_dev = input_allocate_device();
72         if (!pcspkr_dev)
73                 return -ENOMEM;
74
75         pcspkr_dev->name = "PC Speaker";
76         pcspkr_dev->phys = "isa0061/input0";
77         pcspkr_dev->id.bustype = BUS_ISA;
78         pcspkr_dev->id.vendor = 0x001f;
79         pcspkr_dev->id.product = 0x0001;
80         pcspkr_dev->id.version = 0x0100;
81         pcspkr_dev->cdev.dev = &dev->dev;
82
83         pcspkr_dev->evbit[0] = BIT(EV_SND);
84         pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
85         pcspkr_dev->event = pcspkr_event;
86
87         err = input_register_device(pcspkr_dev);
88         if (err) {
89                 input_free_device(pcspkr_dev);
90                 return err;
91         }
92
93         platform_set_drvdata(dev, pcspkr_dev);
94
95         return 0;
96 }
97
98 static int __devexit pcspkr_remove(struct platform_device *dev)
99 {
100         struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
101
102         input_unregister_device(pcspkr_dev);
103         platform_set_drvdata(dev, NULL);
104         /* turn off the speaker */
105         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
106
107         return 0;
108 }
109
110 static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
111 {
112         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
113
114         return 0;
115 }
116
117 static void pcspkr_shutdown(struct platform_device *dev)
118 {
119         /* turn off the speaker */
120         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
121 }
122
123 static struct platform_driver pcspkr_platform_driver = {
124         .driver         = {
125                 .name   = "pcspkr",
126                 .owner  = THIS_MODULE,
127         },
128         .probe          = pcspkr_probe,
129         .remove         = __devexit_p(pcspkr_remove),
130         .suspend        = pcspkr_suspend,
131         .shutdown       = pcspkr_shutdown,
132 };
133
134
135 static int __init pcspkr_init(void)
136 {
137         return platform_driver_register(&pcspkr_platform_driver);
138 }
139
140 static void __exit pcspkr_exit(void)
141 {
142         platform_driver_unregister(&pcspkr_platform_driver);
143 }
144
145 module_init(pcspkr_init);
146 module_exit(pcspkr_exit);