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