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			break;
58		case SND_TONE:
59			break;
60		default:
61			return -1;
62		}
63		break;
64
65	default:
66		return -1;
67	}
68
69	if (value > 20 && value < 32767)
70		count = PIT_TICK_RATE / value;
71
72	pcspkr_do_sound(count);
73
74	return 0;
75}
76
77int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
78{
79	int err;
80
81	struct input_dev *input_dev = devm_input_allocate_device(dev);
82	if (!input_dev)
83		return -ENOMEM;
84
85	input_dev->name = "PC Speaker";
86	input_dev->phys = "isa0061/input0";
87	input_dev->id.bustype = BUS_ISA;
88	input_dev->id.vendor = 0x001f;
89	input_dev->id.product = 0x0001;
90	input_dev->id.version = 0x0100;
91	input_dev->dev.parent = dev;
92
93	input_dev->evbit[0] = BIT(EV_SND);
94	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
95	input_dev->event = pcspkr_input_event;
96
97	err = input_register_device(input_dev);
98	if (err)
99		return err;
100
101	*rdev = input_dev;
102	return 0;
103}
104