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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * Copyright (C) 2006 Josef Cejka

 * 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.

 */

#include <arch/kbd.h>

#include <ipc/ipc.h>

#define SPECIAL		'?'

#define KEY_RELEASE	0x80

/**

 * These codes read from i8042 data register are silently ignored.

 */

#define IGNORE_CODE	0x7f

#define PRESSED_SHIFT		(1<<0)

#define PRESSED_CAPSLOCK	(1<<1)

#define LOCKED_CAPSLOCK		(1<<0)

/** Scancodes. */

#define SC_ESC		0x01

#define SC_BACKSPACE	0x0e

#define SC_LSHIFT	0x2a

#define SC_RSHIFT	0x36

#define SC_CAPSLOCK	0x3a

#define SC_SPEC_ESCAPE  0xe0

#define SC_LEFTARR      0x4b

#define SC_RIGHTARR     0x4d

#define SC_UPARR        0x48

#define SC_DOWNARR      0x50

#define SC_DELETE       0x53

#define SC_HOME         0x47

#define SC_END          0x4f

#define FUNCTION_KEYS 0x100

static volatile int keyflags;		/**< Tracking of multiple keypresses. */

static volatile int lockflags;		/**< Tracking of multiple keys lockings. */

/** Primary meaning of scancodes. */

static int sc_primary_map[] = {

	SPECIAL, /* 0x00 */

	SPECIAL, /* 0x01 - Esc */

	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',

	'\b', /* 0x0e - Backspace */

	'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',

	SPECIAL, /* 0x1d - LCtrl */

	'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',

	'`',

	SPECIAL, /* 0x2a - LShift */ 

	'\\',

	'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',

	SPECIAL, /* 0x36 - RShift */

	'*',

	SPECIAL, /* 0x38 - LAlt */

	' ',

	SPECIAL, /* 0x3a - CapsLock */

	(FUNCTION_KEYS | 1), /* 0x3b - F1 */

	(FUNCTION_KEYS | 2), /* 0x3c - F2 */

	(FUNCTION_KEYS | 3), /* 0x3d - F3 */

	(FUNCTION_KEYS | 4), /* 0x3e - F4 */

	(FUNCTION_KEYS | 5), /* 0x3f - F5 */

	(FUNCTION_KEYS | 6), /* 0x40 - F6 */

	(FUNCTION_KEYS | 7), /* 0x41 - F7 */

	(FUNCTION_KEYS | 8), /* 0x42 - F8 */

	(FUNCTION_KEYS | 9), /* 0x43 - F9 */

	(FUNCTION_KEYS | 10), /* 0x44 - F10 */

	SPECIAL, /* 0x45 - NumLock */

	SPECIAL, /* 0x46 - ScrollLock */

	'7', '8', '9', '-',

	'4', '5', '6', '+',

	'1', '2', '3',

	'0', '.',

	SPECIAL, /* 0x54 - Alt-SysRq */

	SPECIAL, /* 0x55 - F11/F12/PF1/FN */

	SPECIAL, /* 0x56 - unlabelled key next to LAlt */

	FUNCTION_KEYS | 11, /* 0x57 - F11 */

	FUNCTION_KEYS | 12, /* 0x58 - F12 */

	SPECIAL, /* 0x59 */

	SPECIAL, /* 0x5a */

	SPECIAL, /* 0x5b */

	SPECIAL, /* 0x5c */

	SPECIAL, /* 0x5d */

	SPECIAL, /* 0x5e */

	SPECIAL, /* 0x5f */

	SPECIAL, /* 0x60 */

	SPECIAL, /* 0x61 */

	SPECIAL, /* 0x62 */

	SPECIAL, /* 0x63 */

	SPECIAL, /* 0x64 */

	SPECIAL, /* 0x65 */

	SPECIAL, /* 0x66 */

	SPECIAL, /* 0x67 */

	SPECIAL, /* 0x68 */

	SPECIAL, /* 0x69 */

	SPECIAL, /* 0x6a */

	SPECIAL, /* 0x6b */

	SPECIAL, /* 0x6c */

	SPECIAL, /* 0x6d */

	SPECIAL, /* 0x6e */

	SPECIAL, /* 0x6f */

	SPECIAL, /* 0x70 */

	SPECIAL, /* 0x71 */

	SPECIAL, /* 0x72 */

	SPECIAL, /* 0x73 */

	SPECIAL, /* 0x74 */

	SPECIAL, /* 0x75 */

	SPECIAL, /* 0x76 */

	SPECIAL, /* 0x77 */

	SPECIAL, /* 0x78 */

	SPECIAL, /* 0x79 */

	SPECIAL, /* 0x7a */

	SPECIAL, /* 0x7b */

	SPECIAL, /* 0x7c */

	SPECIAL, /* 0x7d */

	SPECIAL, /* 0x7e */

	SPECIAL, /* 0x7f */

};

/** Secondary meaning of scancodes. */

static char sc_secondary_map[] = {

	SPECIAL, /* 0x00 */

	SPECIAL, /* 0x01 - Esc */

	'!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',

	SPECIAL, /* 0x0e - Backspace */

	'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',

	SPECIAL, /* 0x1d - LCtrl */

	'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',

	'~',

	SPECIAL, /* 0x2a - LShift */ 

	'|',

	'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',

	SPECIAL, /* 0x36 - RShift */

	'*',

	SPECIAL, /* 0x38 - LAlt */

	' ',

	SPECIAL, /* 0x3a - CapsLock */

	SPECIAL, /* 0x3b - F1 */

	SPECIAL, /* 0x3c - F2 */

	SPECIAL, /* 0x3d - F3 */

	SPECIAL, /* 0x3e - F4 */

	SPECIAL, /* 0x3f - F5 */

	SPECIAL, /* 0x40 - F6 */

	SPECIAL, /* 0x41 - F7 */

	SPECIAL, /* 0x42 - F8 */

	SPECIAL, /* 0x43 - F9 */

	SPECIAL, /* 0x44 - F10 */

	SPECIAL, /* 0x45 - NumLock */

	SPECIAL, /* 0x46 - ScrollLock */

	'7', '8', '9', '-',

	'4', '5', '6', '+',

	'1', '2', '3',

	'0', '.',

	SPECIAL, /* 0x54 - Alt-SysRq */

	SPECIAL, /* 0x55 - F11/F12/PF1/FN */

	SPECIAL, /* 0x56 - unlabelled key next to LAlt */

	SPECIAL, /* 0x57 - F11 */

	SPECIAL, /* 0x58 - F12 */

	SPECIAL, /* 0x59 */

	SPECIAL, /* 0x5a */

	SPECIAL, /* 0x5b */

	SPECIAL, /* 0x5c */

	SPECIAL, /* 0x5d */

	SPECIAL, /* 0x5e */

	SPECIAL, /* 0x5f */

	SPECIAL, /* 0x60 */

	SPECIAL, /* 0x61 */

	SPECIAL, /* 0x62 */

	SPECIAL, /* 0x63 */

	SPECIAL, /* 0x64 */

	SPECIAL, /* 0x65 */

	SPECIAL, /* 0x66 */

	SPECIAL, /* 0x67 */

	SPECIAL, /* 0x68 */

	SPECIAL, /* 0x69 */

	SPECIAL, /* 0x6a */

	SPECIAL, /* 0x6b */

	SPECIAL, /* 0x6c */

	SPECIAL, /* 0x6d */

	SPECIAL, /* 0x6e */

	SPECIAL, /* 0x6f */

	SPECIAL, /* 0x70 */

	SPECIAL, /* 0x71 */

	SPECIAL, /* 0x72 */

	SPECIAL, /* 0x73 */

	SPECIAL, /* 0x74 */

	SPECIAL, /* 0x75 */

	SPECIAL, /* 0x76 */

	SPECIAL, /* 0x77 */

	SPECIAL, /* 0x78 */

	SPECIAL, /* 0x79 */

	SPECIAL, /* 0x7a */

	SPECIAL, /* 0x7b */

	SPECIAL, /* 0x7c */

	SPECIAL, /* 0x7d */

	SPECIAL, /* 0x7e */

	SPECIAL, /* 0x7f */	

};

irq_cmd_t i8042_cmds[1] = {

	{ CMD_PORT_READ_1, (void *)0x60, 0 }

};

irq_code_t i8042_kbd = {

	1,

	i8042_cmds

};

static int key_released(keybuffer_t *keybuffer, unsigned char key)

{

	switch (key) {

		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;

	}

}

static int key_pressed(keybuffer_t *keybuffer, unsigned char key)

{

	int *map = sc_primary_map;

	int ascii = sc_primary_map[key];

	int shift, capslock;

	int letter = 0;

	switch (key) {

		case SC_LSHIFT:

		case SC_RSHIFT:

		    	keyflags |= PRESSED_SHIFT;

			break;

		case SC_CAPSLOCK:

			keyflags |= PRESSED_CAPSLOCK;

			break;

		case SC_SPEC_ESCAPE:

			break;

	/*	case SC_LEFTARR:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x5b);	

				keybuffer_push(keybuffer, 0x44);	

			}

			break;

		case SC_RIGHTARR:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x5b);	

				keybuffer_push(keybuffer, 0x43);	

			}

			break;

		case SC_UPARR:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x5b);	

				keybuffer_push(keybuffer, 0x41);	

			}

			break;

		case SC_DOWNARR:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x5b);	

				keybuffer_push(keybuffer, 0x42);	

			}

			break;

		case SC_HOME:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x4f);	

				keybuffer_push(keybuffer, 0x48);	

			}

			break;

		case SC_END:

			if (keybuffer_available(keybuffer) >= 3) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x4f);	

				keybuffer_push(keybuffer, 0x46);	

			}

			break;

		case SC_DELETE:

			if (keybuffer_available(keybuffer) >= 4) {

				keybuffer_push(keybuffer, 0x1b);	

				keybuffer_push(keybuffer, 0x5b);	

				keybuffer_push(keybuffer, 0x33);	

				keybuffer_push(keybuffer, 0x7e);	

			}

			break;

	*/	default:

		    	letter = ((ascii >= 'a') && (ascii <= 'z'));

			capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);

			shift = keyflags & PRESSED_SHIFT;

			if (letter && capslock)

				shift = !shift;

			if (shift)

				map = sc_secondary_map;

			if (map[key] != SPECIAL)

				keybuffer_push(keybuffer, map[key]);	

			break;

	}

}

/** Register uspace irq handler

 * @return 

 */

int kbd_arch_init(void)

{

	return !(ipc_register_irq(1, &i8042_kbd));

}

int kbd_arch_process(keybuffer_t *keybuffer, int scan_code)

{

	if (scan_code != IGNORE_CODE) {

		if (scan_code & KEY_RELEASE)

			key_released(keybuffer, scan_code ^ KEY_RELEASE);

		else

			key_pressed(keybuffer, scan_code);

	}

	return 	1;

}