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

   1/*
   2 *  PC Speaker beeper driver for Linux
   3 *
   4 *  Copyright (c) 2002 Vojtech Pavlik
   5 *  Copyright (c) 1992 Orest Zborowski
   6 *
   7 */
   8
   9/*
  10 * This program is free software; you can redistribute it and/or modify it
  11 * under the terms of the GNU General Public License version 2 as published by
  12 * the Free Software Foundation
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/input.h>
  19#include <linux/platform_device.h>
  20#include <linux/timex.h>
  21#include <asm/io.h>
  22
  23MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  24MODULE_DESCRIPTION("PC Speaker beeper driver");
  25MODULE_LICENSE("GPL");
  26MODULE_ALIAS("platform:pcspkr");
  27
  28#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
  29/* Use the global PIT lock ! */
  30#include <asm/i8253.h>
  31#else
  32#include <asm/8253pit.h>
  33static DEFINE_RAW_SPINLOCK(i8253_lock);
  34#endif
  35
  36static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  37{
  38        unsigned int count = 0;
  39        unsigned long flags;
  40
  41        if (type != EV_SND)
  42                return -1;
  43
  44        switch (code) {
  45                case SND_BELL: if (value) value = 1000;
  46                case SND_TONE: break;
  47                default: return -1;
  48        }
  49
  50        if (value > 20 && value < 32767)
  51                count = PIT_TICK_RATE / value;
  52
  53        raw_spin_lock_irqsave(&i8253_lock, flags);
  54
  55        if (count) {
  56                /* set command for counter 2, 2 byte write */
  57                outb_p(0xB6, 0x43);
  58                /* select desired HZ */
  59                outb_p(count & 0xff, 0x42);
  60                outb((count >> 8) & 0xff, 0x42);
  61                /* enable counter 2 */
  62                outb_p(inb_p(0x61) | 3, 0x61);
  63        } else {
  64                /* disable counter 2 */
  65                outb(inb_p(0x61) & 0xFC, 0x61);
  66        }
  67
  68        raw_spin_unlock_irqrestore(&i8253_lock, flags);
  69
  70        return 0;
  71}
  72
  73static int __devinit pcspkr_probe(struct platform_device *dev)
  74{
  75        struct input_dev *pcspkr_dev;
  76        int err;
  77
  78        pcspkr_dev = input_allocate_device();
  79        if (!pcspkr_dev)
  80                return -ENOMEM;
  81
  82        pcspkr_dev->name = "PC Speaker";
  83        pcspkr_dev->phys = "isa0061/input0";
  84        pcspkr_dev->id.bustype = BUS_ISA;
  85        pcspkr_dev->id.vendor = 0x001f;
  86        pcspkr_dev->id.product = 0x0001;
  87        pcspkr_dev->id.version = 0x0100;
  88        pcspkr_dev->dev.parent = &dev->dev;
  89
  90        pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
  91        pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
  92        pcspkr_dev->event = pcspkr_event;
  93
  94        err = input_register_device(pcspkr_dev);
  95        if (err) {
  96                input_free_device(pcspkr_dev);
  97                return err;
  98        }
  99
 100        platform_set_drvdata(dev, pcspkr_dev);
 101
 102        return 0;
 103}
 104
 105static int __devexit pcspkr_remove(struct platform_device *dev)
 106{
 107        struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
 108
 109        input_unregister_device(pcspkr_dev);
 110        platform_set_drvdata(dev, NULL);
 111        /* turn off the speaker */
 112        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 113
 114        return 0;
 115}
 116
 117static int pcspkr_suspend(struct device *dev)
 118{
 119        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 120
 121        return 0;
 122}
 123
 124static void pcspkr_shutdown(struct platform_device *dev)
 125{
 126        /* turn off the speaker */
 127        pcspkr_event(NULL, EV_SND, SND_BELL, 0);
 128}
 129
 130static const struct dev_pm_ops pcspkr_pm_ops = {
 131        .suspend = pcspkr_suspend,
 132};
 133
 134static struct platform_driver pcspkr_platform_driver = {
 135        .driver         = {
 136                .name   = "pcspkr",
 137                .owner  = THIS_MODULE,
 138                .pm     = &pcspkr_pm_ops,
 139        },
 140        .probe          = pcspkr_probe,
 141        .remove         = __devexit_p(pcspkr_remove),
 142        .shutdown       = pcspkr_shutdown,
 143};
 144
 145
 146static int __init pcspkr_init(void)
 147{
 148        return platform_driver_register(&pcspkr_platform_driver);
 149}
 150
 151static void __exit pcspkr_exit(void)
 152{
 153        platform_driver_unregister(&pcspkr_platform_driver);
 154}
 155
 156module_init(pcspkr_init);
 157module_exit(pcspkr_exit);
 158