Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6
[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/io.h>
21
22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23 MODULE_DESCRIPTION("PC Speaker beeper driver");
24 MODULE_LICENSE("GPL");
25 MODULE_ALIAS("platform:pcspkr");
26
27 #ifdef CONFIG_X86
28 /* Use the global PIT lock ! */
29 #include <asm/i8253.h>
30 #else
31 #include <asm/8253pit.h>
32 static DEFINE_SPINLOCK(i8253_lock);
33 #endif
34
35 static 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
72 static 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(EV_SND);
90         pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(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
104 static 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
116 static 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
123 static void pcspkr_shutdown(struct platform_device *dev)
124 {
125         /* turn off the speaker */
126         pcspkr_event(NULL, EV_SND, SND_BELL, 0);
127 }
128
129 static 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
141 static int __init pcspkr_init(void)
142 {
143         return platform_driver_register(&pcspkr_platform_driver);
144 }
145
146 static void __exit pcspkr_exit(void)
147 {
148         platform_driver_unregister(&pcspkr_platform_driver);
149 }
150
151 module_init(pcspkr_init);
152 module_exit(pcspkr_exit);