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/init.h>
11#include <linux/input.h>
12#include <linux/io.h>
13#include "pcsp.h"
14#include "pcsp_input.h"
15
16static void pcspkr_do_sound(unsigned int count)
17{
18	unsigned long flags;
19
20	raw_spin_lock_irqsave(&i8253_lock, flags);
21
22	if (count) {
23		/* set command for counter 2, 2 byte write */
24		outb_p(0xB6, 0x43);
25		/* select desired HZ */
26		outb_p(count & 0xff, 0x42);
27		outb((count >> 8) & 0xff, 0x42);
28		/* enable counter 2 */
29		outb_p(inb_p(0x61) | 3, 0x61);
30	} else {
31		/* disable counter 2 */
32		outb(inb_p(0x61) & 0xFC, 0x61);
33	}
34
35	raw_spin_unlock_irqrestore(&i8253_lock, flags);
36}
37
38void pcspkr_stop_sound(void)
39{
40	pcspkr_do_sound(0);
41}
42
43static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
44			      unsigned int code, int value)
45{
46	unsigned int count = 0;
47
48	if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
49		return 0;
50
51	switch (type) {
52	case EV_SND:
53		switch (code) {
54		case SND_BELL:
55			if (value)
56				value = 1000;
57		case SND_TONE:
58			break;
59		default:
60			return -1;
61		}
62		break;
63
64	default:
65		return -1;
66	}
67
68	if (value > 20 && value < 32767)
69		count = PIT_TICK_RATE / value;
70
71	pcspkr_do_sound(count);
72
73	return 0;
74}
75
76int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
77{
78	int err;
79
80	struct input_dev *input_dev = input_allocate_device();
81	if (!input_dev)
82		return -ENOMEM;
83
84	input_dev->name = "PC Speaker";
85	input_dev->phys = "isa0061/input0";
86	input_dev->id.bustype = BUS_ISA;
87	input_dev->id.vendor = 0x001f;
88	input_dev->id.product = 0x0001;
89	input_dev->id.version = 0x0100;
90	input_dev->dev.parent = dev;
91
92	input_dev->evbit[0] = BIT(EV_SND);
93	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
94	input_dev->event = pcspkr_input_event;
95
96	err = input_register_device(input_dev);
97	if (err) {
98		input_free_device(input_dev);
99		return err;
100	}
101
102	*rdev = input_dev;
103	return 0;
104}
105
106int pcspkr_input_remove(struct input_dev *dev)
107{
108	pcspkr_stop_sound();
109	input_unregister_device(dev);	/* this also does kfree() */
110
111	return 0;
112}
113