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
16 static 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
38 void pcspkr_stop_sound(void)
39 {
40 pcspkr_do_sound(0);
41 }
42
43 static 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
77 int 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
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