LXR linux/drivers/input/misc/pcspkr.c

   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        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
  65static 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
  97static 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
 108static int pcspkr_suspend(struct device *dev)
 109{
 110        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 111
 112        return 0;
 113}
 114
 115static void pcspkr_shutdown(struct platform_device *dev)
 116{
 117        /* turn off the speaker */
 118        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 119}
 120
 121static const struct dev_pm_ops pcspkr_pm_ops = {
 122        .suspend = pcspkr_suspend,
 123};
 124
 125static 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};
 134module_platform_driver(pcspkr_platform_driver);
 135
 136