linux/drivers/input/misc/pcspkr.c
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   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
  18MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  19MODULE_DESCRIPTION("PC Speaker beeper driver");
  20MODULE_LICENSE("GPL");
  21MODULE_ALIAS("platform:pcspkr");
  22
  23static 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(0xB6, 0x43);
  51                /* select desired HZ */
  52                outb_p(count & 0xff, 0x42);
  53                outb((count >> 8) & 0xff, 0x42);
  54                /* enable counter 2 */
  55                outb_p(inb_p(0x61) | 3, 0x61);
  56        } else {
  57                /* disable counter 2 */
  58                outb(inb_p(0x61) & 0xFC, 0x61);
  59        }
  60
  61        raw_spin_unlock_irqrestore(&i8253_lock, flags);
  62
  63        return 0;
  64}
  65
  66static 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(pcspkr_dev);
  90                return err;
  91        }
  92
  93        platform_set_drvdata(dev, pcspkr_dev);
  94
  95        return 0;
  96}
  97
  98static int pcspkr_remove(struct platform_device *dev)
  99{
 100        struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 101
 102        input_unregister_device(pcspkr_dev);
 103        /* turn off the speaker */
 104        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 105
 106        return 0;
 107}
 108
 109static int pcspkr_suspend(struct device *dev)
 110{
 111        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 112
 113        return 0;
 114}
 115
 116static void pcspkr_shutdown(struct platform_device *dev)
 117{
 118        /* turn off the speaker */
 119        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 120}
 121
 122static const struct dev_pm_ops pcspkr_pm_ops = {
 123        .suspend = pcspkr_suspend,
 124};
 125
 126static 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};
 135module_platform_driver(pcspkr_platform_driver);
 136
 137