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/*

 * Copyright (C) 2001-2004 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	i8042.c

 * @brief	i8042 processor driver.

 *

 * It takes care of low-level keyboard functions.

 */

#include <genarch/i8042/i8042.h>

#include <arch/drivers/i8042.h>

#include <arch/interrupt.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <synch/spinlock.h>

#include <typedefs.h>

#include <console/chardev.h>

#include <console/console.h>

#include <macros.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 		0x49

#define i8042_BUFFER_FULL_MASK	0x01

#define i8042_WAIT_MASK 	0x02

#define SPECIAL		'?'

#define KEY_RELEASE	0x80

/**

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

 */

#define IGNORE_CODE	0x7f

static void key_released(__u8 sc);

static void key_pressed(__u8 sc);

static char key_read(chardev_t *d);

#define PRESSED_SHIFT		(1<<0)

#define PRESSED_CAPSLOCK	(1<<1)

#define LOCKED_CAPSLOCK		(1<<0)

#define ACTIVE_READ_BUFF_SIZE 16 	/* Must be power of 2 */

static __u8 active_read_buff[ACTIVE_READ_BUFF_SIZE];

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. */

static void i8042_suspend(chardev_t *);

static void i8042_resume(chardev_t *);

static chardev_t kbrd;

static chardev_operations_t ops = {

	.suspend = i8042_suspend,

	.resume = i8042_resume,

	.read = key_read

};

/** Primary meaning of scancodes. */

static char 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 */

	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 */

};

/** 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 */	

};

static void i8042_interrupt(int n, istate_t *istate);

static void i8042_wait(void);

static iroutine oldvector;

/** Initialize keyboard and service interrupts using kernel routine */

void i8042_grab(void)

{

	oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);

	i8042_wait();

	i8042_command_write(i8042_SET_COMMAND);

	i8042_wait();

	i8042_data_write(i8042_COMMAND);

	i8042_wait();

}

/** Resume the former interrupt vector */

void i8042_release(void)

{

	if (oldvector)

		exc_register(VECTOR_KBD, "user_interrupt", oldvector);

}

/** Initialize i8042. */

void i8042_init(void)

{

	int i;

	i8042_grab();

        /* Prevent user from accidentaly releasing calling i8042_resume

	 * and disabling keyboard 

	 */

	oldvector = NULL; 

	trap_virtual_enable_irqs(1<<IRQ_KBD);

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

	stdin = &kbrd;

	/*

	 * Clear input buffer.

	 * Number of iterations is limited to prevent infinite looping.

	 */

	for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {

		i8042_data_read();

	}  

}

/** Process i8042 interrupt.

 *

 * @param n Interrupt vector.

 * @param istate Interrupted state.

 */

void i8042_interrupt(int n, istate_t *istate)

{

	__u8 x;

	while ((i8042_status_read() & i8042_BUFFER_FULL_MASK)) {

		x = i8042_data_read();

		if (x & KEY_RELEASE)

			key_released(x ^ KEY_RELEASE);

		else

			key_pressed(x);

	}

	trap_virtual_eoi();

}

/** Wait until the controller reads its data. */

void i8042_wait(void) {

	while (i8042_status_read() & i8042_WAIT_MASK) {

		/* wait */

	}

}

/** Process release of key.

 *

 * @param sc Scancode of the key being released.

 */

void key_released(__u8 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.

 */

void key_pressed(__u8 sc)

{

	char *map = sc_primary_map;

	char ascii = sc_primary_map[sc];

	bool shift, capslock;

	bool letter = false;

	spinlock_lock(&keylock);

	switch (sc) {

	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:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x5b);

		chardev_push_character(&kbrd, 0x44);

		break;

	case SC_RIGHTARR:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x5b);

		chardev_push_character(&kbrd, 0x43);

		break;

	case SC_UPARR:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x5b);

		chardev_push_character(&kbrd, 0x41);

		break;

	case SC_DOWNARR:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x5b);

		chardev_push_character(&kbrd, 0x42);

		break;

	case SC_HOME:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x4f);

		chardev_push_character(&kbrd, 0x48);

		break;

	case SC_END:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x4f);

		chardev_push_character(&kbrd, 0x46);

		break;

	case SC_DELETE:

		chardev_push_character(&kbrd, 0x1b);

		chardev_push_character(&kbrd, 0x5b);

		chardev_push_character(&kbrd, 0x33);

		chardev_push_character(&kbrd, 0x7e);

		break;

	default:

	    	letter = is_lower(ascii);

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

		shift = keyflags & PRESSED_SHIFT;

		if (letter && capslock)

			shift = !shift;

		if (shift)

			map = sc_secondary_map;

		chardev_push_character(&kbrd, map[sc]);

		break;

	}

	spinlock_unlock(&keylock);

}

/* Called from getc(). */

void i8042_resume(chardev_t *d)

{

}

/* Called from getc(). */

void i8042_suspend(chardev_t *d)

{

}

static __u8 active_read_buff_read(void)

{

	static int i=0;

	i &= (ACTIVE_READ_BUFF_SIZE-1);

	if(!active_read_buff[i]) {

		return 0;

	}

	return active_read_buff[i++];

}

static void active_read_buff_write(__u8 ch)

{

	static int i=0;

	active_read_buff[i] = ch;

	i++;

	i &= (ACTIVE_READ_BUFF_SIZE-1);

	active_read_buff[i]=0;

}

static void active_read_key_pressed(__u8 sc)

{

	char *map = sc_primary_map;

	char ascii = sc_primary_map[sc];

	bool shift, capslock;

	bool letter = false;

	/*spinlock_lock(&keylock);*/

	switch (sc) {

	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:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x5b);

		active_read_buff_write(0x44);

		break;

	case SC_RIGHTARR:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x5b);

		active_read_buff_write(0x43);

		break;

	case SC_UPARR:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x5b);

		active_read_buff_write(0x41);

		break;

	case SC_DOWNARR:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x5b);

		active_read_buff_write(0x42);

		break;

	case SC_HOME:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x4f);

		active_read_buff_write(0x48);

		break;

	case SC_END:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x4f);

		active_read_buff_write(0x46);

		break;

	case SC_DELETE:

		active_read_buff_write(0x1b);

		active_read_buff_write(0x5b);

		active_read_buff_write(0x33);

		active_read_buff_write(0x7e);

		break;

	default:

	    	letter = is_lower(ascii);

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

		shift = keyflags & PRESSED_SHIFT;

		if (letter && capslock)

			shift = !shift;

		if (shift)

			map = sc_secondary_map;

		active_read_buff_write(map[sc]);

		break;

	}

	/*spinlock_unlock(&keylock);*/

}

static char key_read(chardev_t *d)

{

	char ch;	

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

		__u8 x;

		while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))

			;

		x = i8042_data_read();

		if (x != IGNORE_CODE) {

			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 i8042_poll(void)

{

	__u8 x;

	while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {

		x = i8042_data_read();

		if (x != IGNORE_CODE) {

			if (x & KEY_RELEASE)

				key_released(x ^ KEY_RELEASE);

			else

				key_pressed(x);

		}

	}

}

/** @}

 */