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