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pcsp_input.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/8253pit.h>
#include <asm/i8253.h>
#include <asm/io.h>
#include "pcsp.h"


static void pcspkr_do_sound(unsigned int count)
{
      unsigned long flags;

      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);
}

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

      if (snd_pcsp_chip->timer_active || !snd_pcsp_chip->pcspkr)
            return 0;

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

      default:
            return -1;
      }

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

      pcspkr_do_sound(count);

      return 0;
}

int pcspkr_input_init(struct snd_pcsp *chip)
{
      int err;

      chip->input_dev = input_allocate_device();
      if (!chip->input_dev)
            return -ENOMEM;

      chip->input_dev->name = "PC Speaker";
      chip->input_dev->phys = "isa0061/input0";
      chip->input_dev->id.bustype = BUS_ISA;
      chip->input_dev->id.vendor = 0x001f;
      chip->input_dev->id.product = 0x0001;
      chip->input_dev->id.version = 0x0100;

      chip->input_dev->evbit[0] = BIT(EV_SND);
      chip->input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
      chip->input_dev->event = pcspkr_input_event;

      err = input_register_device(chip->input_dev);
      if (err) {
            input_free_device(chip->input_dev);
            chip->input_dev = NULL;
            return err;
      }

      return 0;
}

int pcspkr_input_remove(struct snd_pcsp *chip)
{
      if (!chip->input_dev)
            return 0;
      /* turn off the speaker */
      pcspkr_do_sound(0);
      input_unregister_device(chip->input_dev);

      return 0;
}

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