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/*

 * Copyright (c) 2009 Vineeth Pillai

 * 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 arm32  

 * @{

 */

/**

 * @file

 * @brief   pl050 keyboard/mouse driver.

 *

 * It takes care of low-level keyboard functions.

 */

#include <genarch/kbd/key.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <arch/drivers/pl050.h>

#include <console/console.h>

#include <interrupt.h>

#include <sysinfo/sysinfo.h>

#include <ipc/irq.h>

#include <arch/debug/print.h>

#include <genarch/fb/fb.h>

#include <genarch/fb/visuals.h>

#include <print.h>

#define PL050_KEY_RELEASE 0xF0

#define PL050_ESC_KEY   0xE0

#define PL050_CAPS_SCAN_CODE   0x58

static void pl050_suspend(chardev_t *);

static void pl050_resume(chardev_t *);

static chardev_operations_t ops = {

    .suspend = pl050_suspend,

    .resume = pl050_resume,

    .read = pl050_key_read

};

/** Structure for pl050's IRQ. */

static irq_t pl050_kbd_irq;

/* static irq_t pl050_mouse_irq; */

static uintptr_t    pl050_kbd_pbase;

static uintptr_t    pl050_kbd_vbase;

uint8_t pl050_dataread(void)

{

    return *(uint8_t *)(pl050_kbd_vbase + PL050_DATA);

}

uint8_t pl050_statusread(void)

{

    return *(uint8_t *)(pl050_kbd_vbase + PL050_STAT);

}

void pl050_crwrite(uint8_t val)

{

    *(uint8_t *)pl050_kbd_vbase = val;

}

void pl050_grab(void)

{

    ipl_t ipl = interrupts_disable();

    spinlock_lock(&pl050_kbd_irq.lock);

    pl050_kbd_irq.notif_cfg.notify = false;

    spinlock_unlock(&pl050_kbd_irq.lock);

    interrupts_restore(ipl);

}

void pl050_release(void)

{

    ipl_t ipl = interrupts_disable();

    spinlock_lock(&pl050_kbd_irq.lock);

    if (pl050_kbd_irq.notif_cfg.answerbox)

        pl050_kbd_irq.notif_cfg.notify = true;

    spinlock_unlock(&pl050_kbd_irq.lock);

    interrupts_restore(ipl);

}

static irq_ownership_t pl050_claim(void)

{

    return IRQ_ACCEPT;

}

static void pl050_irq_handler(irq_t *irq, void *arg, ...)

{

    static int key_released_flag = 0;

    static int caps_locked = 0;

    if (irq->notif_cfg.notify && irq->notif_cfg.answerbox)

        ipc_irq_send_notif(irq);

    else {

        uint8_t data;

        uint8_t status;

        while (((status = pl050_statusread()) & PL050_STAT_RXFULL)) {

            data = pl050_dataread();

            if (data == PL050_KEY_RELEASE) {

                key_released_flag = 1;

            } else {

                if (key_released_flag) {

                    key_released_flag = 0;

                    if (data == PL050_CAPS_SCAN_CODE) {

                        if (!caps_locked) {

                            caps_locked = 1;

                        } else {

                            caps_locked = 0;

                            return;

                        }

                    }

                    key_released(data);

                } else {

                    if (data == PL050_CAPS_SCAN_CODE && caps_locked)

                        return;

                    key_pressed(data);

                }

            }

        }

    }

}

/** Initialize pl050. */

void pl050_init(devno_t kbd_devno, inr_t kbd_inr, uintptr_t pbase, uintptr_t vbase)

{

    uint8_t val = 0;

    chardev_initialize("pl050_kbd", &kbrd, &ops);

    stdin = &kbrd;

    irq_initialize(&pl050_kbd_irq);

    pl050_kbd_irq.devno = kbd_devno;

    pl050_kbd_irq.inr = kbd_inr;

    pl050_kbd_irq.claim = pl050_claim;

    pl050_kbd_irq.handler = pl050_irq_handler;

    pl050_kbd_pbase = pbase;

    pl050_kbd_vbase = vbase;

    irq_register(&pl050_kbd_irq);

    val = PL050_CR_RXINTR | PL050_CR_INTR;

    pl050_crwrite(val);

    /* reset the data buffer */

    pl050_dataread();

    sysinfo_set_item_val("kbd", NULL, true);

    sysinfo_set_item_val("kbd.devno", NULL, kbd_devno);

    sysinfo_set_item_val("kbd.inr", NULL, kbd_inr);

    sysinfo_set_item_val("kbd.pbase", NULL, pl050_kbd_pbase);

    sysinfo_set_item_val("kbd.vbase", NULL, vbase);

    pl050_grab();

}

/* Called from getc(). */

void pl050_resume(chardev_t *d)

{

}

/* Called from getc(). */

void pl050_suspend(chardev_t *d)

{

}

char pl050_key_read(chardev_t *d)

{

    char ch;   

    printf("entering key_read\n");

    while(!(ch = active_read_buff_read())) {

        uint8_t x;

        while (!(pl050_statusread() & PL050_STAT_RXFULL))

            ;

        x = pl050_dataread();

        if (x & KEY_RELEASE)

            key_released(x ^ KEY_RELEASE);

        else

            active_read_key_pressed(x);

    }

    return ch;

}

/** Poll for key press and release events.

 *

 * This function can be used to implement keyboard polling.

 */

void pl050_poll(void)

{

    uint8_t x;

    printf("entering poll\n");

    while (((x = pl050_statusread() & PL050_STAT_RXFULL))) {

        x = pl050_dataread();

        if (x & KEY_RELEASE)

            key_released(x ^ KEY_RELEASE);

        else

            key_pressed(x);

    }

}

/** @}

 */