| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | case SND_TONE: |
| 37 | break; |
| 38 | default: |
| 39 | return -EINVAL; |
| 40 | } |
| 41 | |
| 42 | if (value > 20 && value < 32767) |
| 43 | count = PIT_TICK_RATE / value; |
| 44 | |
| 45 | raw_spin_lock_irqsave(&i8253_lock, flags); |
| 46 | |
| 47 | if (count) { |
| 48 | /* set command for counter 2, 2 byte write */ |
| 49 | outb_p(0xB6, 0x43); |
| 50 | /* select desired HZ */ |
| 51 | outb_p(count & 0xff, 0x42); |
| 52 | outb((count >> 8) & 0xff, 0x42); |
| 53 | /* enable counter 2 */ |
| 54 | outb_p(inb_p(0x61) | 3, 0x61); |
| 55 | } else { |
| 56 | /* disable counter 2 */ |
| 57 | outb(inb_p(0x61) & 0xFC, 0x61); |
| 58 | } |
| 59 | |
| 60 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static int pcspkr_probe(struct platform_device *dev) |
| 66 | { |
| 67 | struct input_dev *pcspkr_dev; |
| 68 | int err; |
| 69 | |
| 70 | pcspkr_dev = input_allocate_device(); |
| 71 | if (!pcspkr_dev) |
| 72 | return -ENOMEM; |
| 73 | |
| 74 | pcspkr_dev->name = "PC Speaker"; |
| 75 | pcspkr_dev->phys = "isa0061/input0"; |
| 76 | pcspkr_dev->id.bustype = BUS_ISA; |
| 77 | pcspkr_dev->id.vendor = 0x001f; |
| 78 | pcspkr_dev->id.product = 0x0001; |
| 79 | pcspkr_dev->id.version = 0x0100; |
| 80 | pcspkr_dev->dev.parent = &dev->dev; |
| 81 | |
| 82 | pcspkr_dev->evbit[0] = BIT_MASK(EV_SND); |
| 83 | pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); |
| 84 | pcspkr_dev->event = pcspkr_event; |
| 85 | |
| 86 | err = input_register_device(pcspkr_dev); |
| 87 | if (err) { |
| 88 | input_free_device(pcspkr_dev); |
| 89 | return err; |
| 90 | } |
| 91 | |
| 92 | platform_set_drvdata(dev, pcspkr_dev); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int pcspkr_remove(struct platform_device *dev) |
| 98 | { |
| 99 | struct input_dev *pcspkr_dev = platform_get_drvdata(dev); |
| 100 | |
| 101 | input_unregister_device(pcspkr_dev); |
| 102 | /* turn off the speaker */ |
| 103 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static int pcspkr_suspend(struct device *dev) |
| 109 | { |
| 110 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static void pcspkr_shutdown(struct platform_device *dev) |
| 116 | { |
| 117 | /* turn off the speaker */ |
| 118 | pcspkr_event(NULL, EV_SND, SND_BELL, 0); |
| 119 | } |
| 120 | |
| 121 | static const struct dev_pm_ops pcspkr_pm_ops = { |
| 122 | .suspend = pcspkr_suspend, |
| 123 | }; |
| 124 | |
| 125 | static struct platform_driver pcspkr_platform_driver = { |
| 126 | .driver = { |
| 127 | .name = "pcspkr", |
| 128 | .pm = &pcspkr_pm_ops, |
| 129 | }, |
| 130 | .probe = pcspkr_probe, |
| 131 | .remove = pcspkr_remove, |
| 132 | .shutdown = pcspkr_shutdown, |
| 133 | }; |
| 134 | module_platform_driver(pcspkr_platform_driver); |
| 135 | |