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/*

 *  inch.c  -- keyboard minimal driver

 *

 *  Copyright (C) 1999 Eric Valette. valette@crf.canon.fr

 *

 * This code is based on the pc386 BSP inch.c so the following

 * copyright also applies :

 *

 * (C) Copyright 1997 -

 * - NavIST Group - Real-Time Distributed Systems and Industrial Automation

 *

 * http://pandora.ist.utl.pt

 *

 * Instituto Superior Tecnico * Lisboa * PORTUGAL

 *  The license and distribution terms for this file may be

 *  found in found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 * $Id: inch.c,v 1.2 2001-09-27 12:01:06 chris Exp $

 */

#include <bsp.h>

#include <bsp/irq.h>

/*-------------------------------------------------------------------------+

| Constants

+--------------------------------------------------------------------------*/

#define KBD_CTL      0x61  /* -------------------------------- */

#define KBD_DATA     0x60  /* Ports for PC keyboard controller */

#define KBD_STATUS   0x64  /* -------------------------------- */

#define KBD_BUF_SIZE 256

/*-------------------------------------------------------------------------+

| Global Variables

+--------------------------------------------------------------------------*/

static char key_map[] =

{

  0,033,'1','2','3','4','5','6','7','8','9','0','-','=','\b','\t',

  'q','w','e','r','t','y','u','i','o','p','[',']',015,0x80,

  'a','s','d','f','g','h','j','k','l',';',047,0140,0x80,

  0134,'z','x','c','v','b','n','m',',','.','/',0x80,

  '*',0x80,' ',0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,

  0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,

  0x80,0x80,0x80,'0',0177

}; /* Keyboard scancode -> character map with no modifiers.       */

static char shift_map[] =

{

  0,033,'!','@','#','$','%','^','&','*','(',')','_','+','\b','\t',

  'Q','W','E','R','T','Y','U','I','O','P','{','}',015,0x80,

  'A','S','D','F','G','H','J','K','L',':',042,'~',0x80,

  '|','Z','X','C','V','B','N','M','<','>','?',0x80,

  '*',0x80,' ',0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,

  0x80,0x80,0x80,0x80,'7','8','9',0x80,'4','5','6',0x80,

  '1','2','3','0',177

}; /* Keyboard scancode -> character map with SHIFT key modifier. */

static char             kbd_buffer[KBD_BUF_SIZE];

static rtems_unsigned16 kbd_first = 0;

static rtems_unsigned16 kbd_last  = 0;

static rtems_unsigned16 kbd_end   = KBD_BUF_SIZE - 1;

/*-------------------------------------------------------------------------+

|         Function: rtemsReboot

|      Description: Reboot the PC.

| Global Variables: None.

|        Arguments: None.

|          Returns: Nothing.

+--------------------------------------------------------------------------*/

void rtemsReboot(void)

{

  /* shutdown and reboot */

  outport_byte(0x64, 0xFE);      /* use keyboard controler to do the job... */

} /* rtemsReboot */

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_scankey

|      Description: This function can be called during a poll for input, or by

|                   an ISR. Basically any time you want to process a keypress.

| Global Variables: key_map, shift_map.

|        Arguments: outChar - character read in case of a valid reading,

|                   otherwise unchanged.

|          Returns: TRUE in case a valid character has been read,

|                   FALSE otherwise.

+--------------------------------------------------------------------------*/

rtems_boolean

_IBMPC_scankey(char *outChar)

{

  unsigned char inChar;

  static int alt_pressed   = 0;

  static int ctrl_pressed  = 0;

  static int shift_pressed = 0;

  static int caps_pressed  = 0;

  static int extended      = 0;

  *outChar = NULL; /* default value if we return FALSE */

  /* Read keyboard controller, toggle enable */

  inport_byte(KBD_CTL, inChar);

  outport_byte(KBD_CTL, inChar & ~0x80);

  outport_byte(KBD_CTL, inChar | 0x80);

  outport_byte(KBD_CTL, inChar & ~0x80);

  /* See if it has data */

  inport_byte(KBD_STATUS, inChar);

  if ((inChar & 0x01) == 0)

    return FALSE;

  /* Read the data.  Handle nonsense with shift, control, etc. */

  inport_byte(KBD_DATA, inChar);

  if (extended)

    extended--;

  switch (inChar)

  {

    case 0xe0:

      extended = 2;

      return FALSE;

      break;

    case 0x38:

      alt_pressed = 1;

      return FALSE;

      break;

    case 0xb8:

      alt_pressed = 0;

      return FALSE;

      break;

    case 0x1d:

      ctrl_pressed = 1;

      return FALSE;

      break;

    case 0x9d:

      ctrl_pressed = 0;

      return FALSE;

      break;

    case 0x2a:

      if (extended)

        return FALSE;

    case 0x36:

      shift_pressed = 1;

      return FALSE;

      break;

    case 0xaa:

      if (extended)

        return FALSE;

    case 0xb6:

      shift_pressed = 0;

      return FALSE;

      break;

    case 0x3a:

      caps_pressed = 1;

      return FALSE;

      break;

    case 0xba:

      caps_pressed = 0;

      return FALSE;

      break;

    case 0x53:

      if (ctrl_pressed && alt_pressed)

        rtemsReboot(); /* ctrl+alt+del -> reboot */

      break;

    /*

     * Ignore unrecognized keys--usually arrow and such

     */

    default:

      if ((inChar & 0x80) || (inChar > 0x39))

      /* High-bit on means key is being released, not pressed */

        return FALSE;

      break;

  } /* switch */

  /* Strip high bit, look up in our map */

  inChar &= 0x7f;

  if (ctrl_pressed)

  {

    *outChar = key_map[inChar];

    *outChar &= 037;

  }

  else

  {

    *outChar = shift_pressed ? shift_map[inChar] : key_map[inChar];

    if (caps_pressed)

    {

      if (*outChar >= 'A' && *outChar <= 'Z')

        *outChar += 'a' - 'A';

      else if (*outChar >= 'a' && *outChar <= 'z')

        *outChar -= 'a' - 'A';

    }

  }

  return TRUE;

} /* _IBMPC_scankey */

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_keyboard_isr

|      Description: Interrupt Service Routine for keyboard (0x01) IRQ.

| Global Variables: kbd_buffer, kbd_first, kbd_last.

|        Arguments: vector - standard RTEMS argument - see documentation.

|          Returns: standard return value - see documentation.

+--------------------------------------------------------------------------*/

void _IBMPC_keyboard_isr()

{

  if (_IBMPC_scankey(&kbd_buffer[kbd_last]))

  {

    /* Got one; save it if there is enough room in buffer. */

    unsigned int next = (kbd_last == kbd_end) ? 0 : kbd_last + 1;

    if (next != kbd_first)

      {

        kbd_last = next;

      }

  }

} /* _IBMPC_keyboard_isr */

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_chrdy

|      Description: Check keyboard ISR buffer and return character if not empty.

| Global Variables: kbd_buffer, kbd_first, kbd_last.

|        Arguments: c - character read if keyboard buffer not empty, otherwise

|                   unchanged.

|          Returns: TRUE if keyboard buffer not empty, FALSE otherwise.

+--------------------------------------------------------------------------*/

rtems_boolean

_IBMPC_chrdy(char *c)

{

  /* Check buffer our ISR builds */

  if (kbd_first != kbd_last)

  {

    *c = kbd_buffer[kbd_first];

    kbd_first = (kbd_first + 1) % KBD_BUF_SIZE;

    return TRUE;

  }

  else

    return FALSE;

} /* _IBMPC_chrdy */

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_inch

|      Description: Poll keyboard until a character is ready and return it.

| Global Variables: None.

|        Arguments: None.

|          Returns: character read from keyboard.

+--------------------------------------------------------------------------*/

char

_IBMPC_inch(void)

{

    char c;

    while (!_IBMPC_chrdy(&c))

      continue;

    return c;

} /* _IBMPC_inch */

 /*

  * Routine that can be used before interrupt management is initialized.

  */

char

BSP_wait_polled_input(void)

{

  char c;

  while (!_IBMPC_scankey(&c))

    continue;

  return c;

}

/*-------------------------------------------------------------------------+

|         Function: _IBMPC_inch_sleep

|      Description: If charcter is ready return it, otherwise sleep until

|                   it is ready

| Global Variables: None.

|        Arguments: None.

|          Returns: character read from keyboard.

+--------------------------------------------------------------------------*/

char

_IBMPC_inch_sleep(void)

{

    char           c;

    rtems_interval ticks_per_second;

    ticks_per_second = 0;

    for(;;)

      {

        if(_IBMPC_chrdy(&c))

          {

            return c;

          }

        if(ticks_per_second == 0)

          {

            rtems_clock_get(RTEMS_CLOCK_GET_TICKS_PER_SECOND,

                            &ticks_per_second);

          }

        rtems_task_wake_after((ticks_per_second+24)/25);

      }

    return c;

} /* _IBMPC_inch */