1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * m68k beeper driver for Linux
4 *
5 * Copyright (c) 2002 Richard Zidlicky
6 * Copyright (c) 2002 Vojtech Pavlik
7 * Copyright (c) 1992 Orest Zborowski
8 */
9
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/input.h>
15#include <linux/platform_device.h>
16#include <asm/machdep.h>
17#include <asm/io.h>
18
19MODULE_AUTHOR("Richard Zidlicky <rz@linux-m68k.org>");
20MODULE_DESCRIPTION("m68k beeper driver");
21MODULE_LICENSE("GPL");
22
23static struct platform_device *m68kspkr_platform_device;
24
25static int m68kspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
26{
27 unsigned int count = 0;
28
29 if (type != EV_SND)
30 return -1;
31
32 switch (code) {
33 case SND_BELL: if (value) value = 1000;
34 case SND_TONE: break;
35 default: return -1;
36 }
37
38 if (value > 20 && value < 32767)
39 count = 1193182 / value;
40
41 mach_beep(count, -1);
42
43 return 0;
44}
45
46static int m68kspkr_probe(struct platform_device *dev)
47{
48 struct input_dev *input_dev;
49 int err;
50
51 input_dev = input_allocate_device();
52 if (!input_dev)
53 return -ENOMEM;
54
55 input_dev->name = "m68k beeper";
56 input_dev->phys = "m68k/generic";
57 input_dev->id.bustype = BUS_HOST;
58 input_dev->id.vendor = 0x001f;
59 input_dev->id.product = 0x0001;
60 input_dev->id.version = 0x0100;
61 input_dev->dev.parent = &dev->dev;
62
63 input_dev->evbit[0] = BIT_MASK(EV_SND);
64 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
65 input_dev->event = m68kspkr_event;
66
67 err = input_register_device(input_dev);
68 if (err) {
69 input_free_device(dev: input_dev);
70 return err;
71 }
72
73 platform_set_drvdata(pdev: dev, data: input_dev);
74
75 return 0;
76}
77
78static void m68kspkr_remove(struct platform_device *dev)
79{
80 struct input_dev *input_dev = platform_get_drvdata(pdev: dev);
81
82 input_unregister_device(input_dev);
83 /* turn off the speaker */
84 m68kspkr_event(NULL, EV_SND, SND_BELL, value: 0);
85}
86
87static void m68kspkr_shutdown(struct platform_device *dev)
88{
89 /* turn off the speaker */
90 m68kspkr_event(NULL, EV_SND, SND_BELL, value: 0);
91}
92
93static struct platform_driver m68kspkr_platform_driver = {
94 .driver = {
95 .name = "m68kspkr",
96 },
97 .probe = m68kspkr_probe,
98 .remove = m68kspkr_remove,
99 .shutdown = m68kspkr_shutdown,
100};
101
102static int __init m68kspkr_init(void)
103{
104 int err;
105
106 if (!mach_beep) {
107 printk(KERN_INFO "m68kspkr: no lowlevel beep support\n");
108 return -ENODEV;
109 }
110
111 err = platform_driver_register(&m68kspkr_platform_driver);
112 if (err)
113 return err;
114
115 m68kspkr_platform_device = platform_device_alloc(name: "m68kspkr", id: -1);
116 if (!m68kspkr_platform_device) {
117 err = -ENOMEM;
118 goto err_unregister_driver;
119 }
120
121 err = platform_device_add(pdev: m68kspkr_platform_device);
122 if (err)
123 goto err_free_device;
124
125 return 0;
126
127 err_free_device:
128 platform_device_put(pdev: m68kspkr_platform_device);
129 err_unregister_driver:
130 platform_driver_unregister(&m68kspkr_platform_driver);
131
132 return err;
133}
134
135static void __exit m68kspkr_exit(void)
136{
137 platform_device_unregister(m68kspkr_platform_device);
138 platform_driver_unregister(&m68kspkr_platform_driver);
139}
140
141module_init(m68kspkr_init);
142module_exit(m68kspkr_exit);
143

source code of linux/drivers/input/misc/m68kspkr.c