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 <vojtech@ucw.cz>");
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_new	= pcspkr_remove,
131	.shutdown	= pcspkr_shutdown,
132};
133module_platform_driver(pcspkr_platform_driver);
134
135