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/*

 *  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);