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/init.h>
16#include <linux/input.h>
17#include <linux/io.h>
18#include "pcsp.h"
19#include "pcsp_input.h"
20
21static void pcspkr_do_sound(unsigned int count)
22{
23	unsigned long flags;
24
25	raw_spin_lock_irqsave(&i8253_lock, flags);
26
27	if (count) {
28		/* set command for counter 2, 2 byte write */
29		outb_p(0xB6, 0x43);
30		/* select desired HZ */
31		outb_p(count & 0xff, 0x42);
32		outb((count >> 8) & 0xff, 0x42);
33		/* enable counter 2 */
34		outb_p(inb_p(0x61) | 3, 0x61);
35	} else {
36		/* disable counter 2 */
37		outb(inb_p(0x61) & 0xFC, 0x61);
38	}
39
40	raw_spin_unlock_irqrestore(&i8253_lock, flags);
41}
42
43void pcspkr_stop_sound(void)
44{
45	pcspkr_do_sound(0);
46}
47
48static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
49			      unsigned int code, int value)
50{
51	unsigned int count = 0;
52
53	if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
54		return 0;
55
56	switch (type) {
57	case EV_SND:
58		switch (code) {
59		case SND_BELL:
60			if (value)
61				value = 1000;
62		case SND_TONE:
63			break;
64		default:
65			return -1;
66		}
67		break;
68
69	default:
70		return -1;
71	}
72
73	if (value > 20 && value < 32767)
74		count = PIT_TICK_RATE / value;
75
76	pcspkr_do_sound(count);
77
78	return 0;
79}
80
81int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
82{
83	int err;
84
85	struct input_dev *input_dev = input_allocate_device();
86	if (!input_dev)
87		return -ENOMEM;
88
89	input_dev->name = "PC Speaker";
90	input_dev->phys = "isa0061/input0";
91	input_dev->id.bustype = BUS_ISA;
92	input_dev->id.vendor = 0x001f;
93	input_dev->id.product = 0x0001;
94	input_dev->id.version = 0x0100;
95	input_dev->dev.parent = dev;
96
97	input_dev->evbit[0] = BIT(EV_SND);
98	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
99	input_dev->event = pcspkr_input_event;
100
101	err = input_register_device(input_dev);
102	if (err) {
103		input_free_device(input_dev);
104		return err;
105	}
106
107	*rdev = input_dev;
108	return 0;
109}
110
111int pcspkr_input_remove(struct input_dev *dev)
112{
113	pcspkr_stop_sound();
114	input_unregister_device(dev);	/* this also does kfree() */
115
116	return 0;
117}
118