projects/linux·blob master · refs

134 lines · 2.8 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PC Speaker beeper driver for Linux
4 *
5 * Copyright (c) 2002 Vojtech Pavlik
6 * Copyright (c) 1992 Orest Zborowski
7 */
8
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/i8253.h>
13#include <linux/input.h>
14#include <linux/platform_device.h>
15#include <linux/timex.h>
16#include <linux/io.h>
17
18MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
19MODULE_DESCRIPTION("PC Speaker beeper driver");
20MODULE_LICENSE("GPL");
21MODULE_ALIAS("platform:pcspkr");
22
23static int pcspkr_event(struct input_dev *dev, unsigned int type,
24 unsigned int code, int value)
25{
26 unsigned int count = 0;
27 unsigned long flags;
28
29 if (type != EV_SND)
30 return -EINVAL;
31
32 switch (code) {
33 case SND_BELL:
34 if (value)
35 value = 1000;
36 break;
37 case SND_TONE:
38 break;
39 default:
40 return -EINVAL;
41 }
42
43 if (value > 20 && value < 32767)
44 count = PIT_TICK_RATE / value;
45
46 raw_spin_lock_irqsave(&i8253_lock, flags);
47
48 if (count) {
49 /* set command for counter 2, 2 byte write */
50 outb_p(0xB6, 0x43);
51 /* select desired HZ */
52 outb_p(count & 0xff, 0x42);
53 outb((count >> 8) & 0xff, 0x42);
54 /* enable counter 2 */
55 outb_p(inb_p(0x61) | 3, 0x61);
56 } else {
57 /* disable counter 2 */
58 outb(inb_p(0x61) & 0xFC, 0x61);
59 }
60
61 raw_spin_unlock_irqrestore(&i8253_lock, flags);
62
63 return 0;
64}
65
66static int 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->dev.parent = &dev->dev;
82
83 pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
84 pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(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
98static void 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 /* turn off the speaker */
104 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
105}
106
107static int pcspkr_suspend(struct device *dev)
108{
109 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
110
111 return 0;
112}
113
114static void pcspkr_shutdown(struct platform_device *dev)
115{
116 /* turn off the speaker */
117 pcspkr_event(NULL, EV_SND, SND_BELL, 0);
118}
119
120static const struct dev_pm_ops pcspkr_pm_ops = {
121 .suspend = pcspkr_suspend,
122};
123
124static struct platform_driver pcspkr_platform_driver = {
125 .driver = {
126 .name = "pcspkr",
127 .pm = &pcspkr_pm_ops,
128 },
129 .probe = pcspkr_probe,
130 .remove = pcspkr_remove,
131 .shutdown = pcspkr_shutdown,
132};
133module_platform_driver(pcspkr_platform_driver);
134