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/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/i8253.h> |
13 | #include <linux/input.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/timex.h> |
16 | #include <linux/io.h> |
17 | |
18 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>" ); |
19 | MODULE_DESCRIPTION("PC Speaker beeper driver" ); |
20 | MODULE_LICENSE("GPL" ); |
21 | MODULE_ALIAS("platform:pcspkr" ); |
22 | |
23 | static int pcspkr_event(struct input_dev *dev, unsigned int type, |
24 | unsigned int code, int value) |
25 | { |
26 | unsigned int count = 0; |
27 | unsigned long flags; |
28 | |
29 | if (type != EV_SND) |
30 | return -EINVAL; |
31 | |
32 | switch (code) { |
33 | case SND_BELL: |
34 | if (value) |
35 | value = 1000; |
36 | break; |
37 | case SND_TONE: |
38 | break; |
39 | default: |
40 | return -EINVAL; |
41 | } |
42 | |
43 | if (value > 20 && value < 32767) |
44 | count = PIT_TICK_RATE / value; |
45 | |
46 | raw_spin_lock_irqsave(&i8253_lock, flags); |
47 | |
48 | if (count) { |
49 | /* set command for counter 2, 2 byte write */ |
50 | outb_p(value: 0xB6, port: 0x43); |
51 | /* select desired HZ */ |
52 | outb_p(value: count & 0xff, port: 0x42); |
53 | outb(value: (count >> 8) & 0xff, port: 0x42); |
54 | /* enable counter 2 */ |
55 | outb_p(inb_p(port: 0x61) | 3, port: 0x61); |
56 | } else { |
57 | /* disable counter 2 */ |
58 | outb(inb_p(port: 0x61) & 0xFC, port: 0x61); |
59 | } |
60 | |
61 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
62 | |
63 | return 0; |
64 | } |
65 | |
66 | static int pcspkr_probe(struct platform_device *dev) |
67 | { |
68 | struct input_dev *pcspkr_dev; |
69 | int err; |
70 | |
71 | pcspkr_dev = input_allocate_device(); |
72 | if (!pcspkr_dev) |
73 | return -ENOMEM; |
74 | |
75 | pcspkr_dev->name = "PC Speaker" ; |
76 | pcspkr_dev->phys = "isa0061/input0" ; |
77 | pcspkr_dev->id.bustype = BUS_ISA; |
78 | pcspkr_dev->id.vendor = 0x001f; |
79 | pcspkr_dev->id.product = 0x0001; |
80 | pcspkr_dev->id.version = 0x0100; |
81 | pcspkr_dev->dev.parent = &dev->dev; |
82 | |
83 | pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); |
84 | pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); |
85 | pcspkr_dev->event = pcspkr_event; |
86 | |
87 | err = input_register_device(pcspkr_dev); |
88 | if (err) { |
89 | input_free_device(dev: pcspkr_dev); |
90 | return err; |
91 | } |
92 | |
93 | platform_set_drvdata(pdev: dev, data: pcspkr_dev); |
94 | |
95 | return 0; |
96 | } |
97 | |
98 | static int pcspkr_remove(struct platform_device *dev) |
99 | { |
100 | struct input_dev *pcspkr_dev = platform_get_drvdata(pdev: dev); |
101 | |
102 | input_unregister_device(pcspkr_dev); |
103 | /* turn off the speaker */ |
104 | pcspkr_event(NULL, EV_SND, SND_BELL, value: 0); |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | static int pcspkr_suspend(struct device *dev) |
110 | { |
111 | pcspkr_event(NULL, EV_SND, SND_BELL, value: 0); |
112 | |
113 | return 0; |
114 | } |
115 | |
116 | static void pcspkr_shutdown(struct platform_device *dev) |
117 | { |
118 | /* turn off the speaker */ |
119 | pcspkr_event(NULL, EV_SND, SND_BELL, value: 0); |
120 | } |
121 | |
122 | static const struct dev_pm_ops pcspkr_pm_ops = { |
123 | .suspend = pcspkr_suspend, |
124 | }; |
125 | |
126 | static struct platform_driver pcspkr_platform_driver = { |
127 | .driver = { |
128 | .name = "pcspkr" , |
129 | .pm = &pcspkr_pm_ops, |
130 | }, |
131 | .probe = pcspkr_probe, |
132 | .remove = pcspkr_remove, |
133 | .shutdown = pcspkr_shutdown, |
134 | }; |
135 | module_platform_driver(pcspkr_platform_driver); |
136 | |
137 | |