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/*

 * Copyright (c) 2009 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup genarch

 * @{

 */

/**

 * @file

 * @brief   i8042 processor driver.

 *

 * It takes care of low-level keyboard functions.

 */

#include <genarch/kbd/i8042.h>

#include <arch/drivers/kbd.h>

#include <genarch/kbd/key.h>

#include <genarch/kbd/scanc.h>

#include <genarch/kbd/scanc_pc.h>

#include <genarch/drivers/legacy/ia32/io.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <console/chardev.h>

#include <console/console.h>

#include <interrupt.h>

/* Keyboard commands. */

#define KBD_ENABLE  0xf4

#define KBD_DISABLE 0xf5

#define KBD_ACK     0xfa

/*

 * 60  Write 8042 Command Byte: next data byte written to port 60h is

 *     placed in 8042 command register. Format:

 *

 *    |7|6|5|4|3|2|1|0|8042 Command Byte

 *     | | | | | | | `---- 1=enable output register full interrupt

 *     | | | | | | `----- should be 0

 *     | | | | | `------ 1=set status register system, 0=clear

 *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit

 *     | | | `-------- disable keyboard I/O by driving clock line low

 *     | | `--------- disable auxiliary device, drives clock line low

 *     | `---------- IBM scancode translation 0=AT, 1=PC/XT

 *     `----------- reserved, should be 0

 */

#define i8042_SET_COMMAND   0x60

#define i8042_COMMAND       0x69

#define i8042_BUFFER_FULL_MASK  0x01

#define i8042_WAIT_MASK     0x02

#define i8042_MOUSE_DATA    0x20

static void i8042_suspend(chardev_t *);

static void i8042_resume(chardev_t *);

static chardev_operations_t ops = {

    .suspend = i8042_suspend,

    .resume = i8042_resume,

};

static irq_ownership_t i8042_claim(irq_t *irq)

{

    i8042_instance_t *i8042_instance = irq->instance;

    i8042_t *dev = i8042_instance->i8042;

    if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)

        return IRQ_ACCEPT;

    else

        return IRQ_DECLINE;

}

static void i8042_irq_handler(irq_t *irq)

{

    i8042_instance_t *instance = irq->instance;

    i8042_t *dev = instance->i8042;

    uint8_t data;

    uint8_t status;

    if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {

        data = pio_read_8(&dev->data);

        if ((status & i8042_MOUSE_DATA))

            return;

        if (data & KEY_RELEASE)

            key_released(data ^ KEY_RELEASE);

        else

            key_pressed(data);

    }

}

/** Initialize i8042. */

bool

i8042_init(i8042_t *dev, devno_t devno, inr_t inr)

{

    i8042_instance_t *instance;

    chardev_initialize("i8042_kbd", &kbrd, &ops);

    stdin = &kbrd;

    instance = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);

    if (!instance)

        return false;

    instance->devno = devno;

    instance->i8042 = dev;

    irq_initialize(&instance->irq);

    instance->irq.devno = devno;

    instance->irq.inr = inr;

    instance->irq.claim = i8042_claim;

    instance->irq.handler = i8042_irq_handler;

    instance->irq.instance = instance;

    irq_register(&instance->irq);

    trap_virtual_enable_irqs(1 << inr);

    /*

     * Clear input buffer.

     */

    while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)

        (void) pio_read_8(&dev->data);

    return true;

}

/* Called from getc(). */

void i8042_resume(chardev_t *d)

{

}

/* Called from getc(). */

void i8042_suspend(chardev_t *d)

{

}

/** @}

 */