/*
 * 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 Keyboard processing.
 */

#include <genarch/kbrd/kbrd.h>
#include <genarch/kbrd/scanc.h>

#ifdef CONFIG_PC_KBD
#include <genarch/kbrd/scanc_pc.h>
#endif

#ifdef CONFIG_SUN_KBD
#include <genarch/kbrd/scanc_sun.h>
#endif

#include <synch/spinlock.h>
#include <console/chardev.h>
#include <console/console.h>
#include <proc/thread.h>
#include <arch.h>
#include <macros.h>

#define IGNORE_CODE  0x7f
#define KEY_RELEASE  0x80

#define PRESSED_SHIFT     (1 << 0)
#define PRESSED_CAPSLOCK  (1 << 1)
#define LOCKED_CAPSLOCK   (1 << 0)

static indev_t kbrdout;

indev_operations_t kbrdout_ops = {
	.poll = NULL
};

SPINLOCK_INITIALIZE(keylock);   /**< keylock protects keyflags and lockflags. */
static volatile int keyflags;   /**< Tracking of multiple keypresses. */
static volatile int lockflags;  /**< Tracking of multiple keys lockings. */

/** Process release of key.
 *
 * @param sc Scancode of the key being released.
 */
static void key_released(wchar_t sc)
{
	spinlock_lock(&keylock);
	switch (sc) {
	case SC_LSHIFT:
	case SC_RSHIFT:
		keyflags &= ~PRESSED_SHIFT;
		break;
	case SC_CAPSLOCK:
		keyflags &= ~PRESSED_CAPSLOCK;
		if (lockflags & LOCKED_CAPSLOCK)
			lockflags &= ~LOCKED_CAPSLOCK;
		else
			lockflags |= LOCKED_CAPSLOCK;
		break;
	default:
		break;
	}
	spinlock_unlock(&keylock);
}

/** Process keypress.
 *
 * @param sc Scancode of the key being pressed.
 */
static void key_pressed(wchar_t sc)
{
	bool letter;
	bool shift;
	bool capslock;
	
	spinlock_lock(&keylock);
	switch (sc) {
	case SC_LSHIFT:
	case SC_RSHIFT:
		keyflags |= PRESSED_SHIFT;
		break;
	case SC_CAPSLOCK:
		keyflags |= PRESSED_CAPSLOCK;
		break;
	case SC_SCAN_ESCAPE:
		break;
	default:
		letter = islower(sc_primary_map[sc]);
		shift = keyflags & PRESSED_SHIFT;
		capslock = (keyflags & PRESSED_CAPSLOCK) ||
		    (lockflags & LOCKED_CAPSLOCK);
		
		if ((letter) && (capslock))
			shift = !shift;
		
		if (shift)
			indev_push_character(stdin, sc_secondary_map[sc]);
		else
			indev_push_character(stdin, sc_primary_map[sc]);
		break;
	}
	spinlock_unlock(&keylock);
}

static void kkbrd(void *arg)
{
	indev_t *in = (indev_t *) arg;
	
	while (true) {
		wchar_t sc = _getc(in);
		
		if ((sc == IGNORE_CODE) || (sc >= SCANCODES))
			continue;
		
		if (sc & KEY_RELEASE)
			key_released(sc ^ KEY_RELEASE);
		else
			key_pressed(sc);
	}
}

void kbrd_init(indev_t *devin)
{
	indev_initialize("kbrd", &kbrdout, &kbrdout_ops);
	thread_t *thread
	    = thread_create(kkbrd, devin, TASK, 0, "kkbrd", false);
	
	if (thread) {
		stdin = &kbrdout;
		thread_ready(thread);
	}
}

/** @}
 */