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pcspkr.c

/*
 *  PC Speaker beeper driver for Linux
 *
 *  Copyright (c) 2002 Vojtech Pavlik
 *  Copyright (c) 1992 Orest Zborowski
 *
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <asm/io.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("PC Speaker beeper driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcspkr");

#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
/* Use the global PIT lock ! */
#include <asm/i8253.h>
#else
#include <asm/8253pit.h>
static DEFINE_SPINLOCK(i8253_lock);
#endif

static int pcspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
      unsigned int count = 0;
      unsigned long flags;

      if (type != EV_SND)
            return -1;

      switch (code) {
            case SND_BELL: if (value) value = 1000;
            case SND_TONE: break;
            default: return -1;
      }

      if (value > 20 && value < 32767)
            count = PIT_TICK_RATE / value;

      spin_lock_irqsave(&i8253_lock, flags);

      if (count) {
            /* enable counter 2 */
            outb_p(inb_p(0x61) | 3, 0x61);
            /* set command for counter 2, 2 byte write */
            outb_p(0xB6, 0x43);
            /* select desired HZ */
            outb_p(count & 0xff, 0x42);
            outb((count >> 8) & 0xff, 0x42);
      } else {
            /* disable counter 2 */
            outb(inb_p(0x61) & 0xFC, 0x61);
      }

      spin_unlock_irqrestore(&i8253_lock, flags);

      return 0;
}

static int __devinit pcspkr_probe(struct platform_device *dev)
{
      struct input_dev *pcspkr_dev;
      int err;

      pcspkr_dev = input_allocate_device();
      if (!pcspkr_dev)
            return -ENOMEM;

      pcspkr_dev->name = "PC Speaker";
      pcspkr_dev->phys = "isa0061/input0";
      pcspkr_dev->id.bustype = BUS_ISA;
      pcspkr_dev->id.vendor = 0x001f;
      pcspkr_dev->id.product = 0x0001;
      pcspkr_dev->id.version = 0x0100;
      pcspkr_dev->dev.parent = &dev->dev;

      pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
      pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
      pcspkr_dev->event = pcspkr_event;

      err = input_register_device(pcspkr_dev);
      if (err) {
            input_free_device(pcspkr_dev);
            return err;
      }

      platform_set_drvdata(dev, pcspkr_dev);

      return 0;
}

static int __devexit pcspkr_remove(struct platform_device *dev)
{
      struct input_dev *pcspkr_dev = platform_get_drvdata(dev);

      input_unregister_device(pcspkr_dev);
      platform_set_drvdata(dev, NULL);
      /* turn off the speaker */
      pcspkr_event(NULL, EV_SND, SND_BELL, 0);

      return 0;
}

static int pcspkr_suspend(struct platform_device *dev, pm_message_t state)
{
      pcspkr_event(NULL, EV_SND, SND_BELL, 0);

      return 0;
}

static void pcspkr_shutdown(struct platform_device *dev)
{
      /* turn off the speaker */
      pcspkr_event(NULL, EV_SND, SND_BELL, 0);
}

static struct platform_driver pcspkr_platform_driver = {
      .driver           = {
            .name = "pcspkr",
            .owner      = THIS_MODULE,
      },
      .probe            = pcspkr_probe,
      .remove           = __devexit_p(pcspkr_remove),
      .suspend    = pcspkr_suspend,
      .shutdown   = pcspkr_shutdown,
};


static int __init pcspkr_init(void)
{
      return platform_driver_register(&pcspkr_platform_driver);
}

static void __exit pcspkr_exit(void)
{
      platform_driver_unregister(&pcspkr_platform_driver);
}

module_init(pcspkr_init);
module_exit(pcspkr_exit);

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