119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/* Copyright (C) 2005 Thomas Petazzoni
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include <sos/types.h>
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#include <sos/errno.h>
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#include <sos/assert.h>
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#include <hwcore/irq.h>
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#include <hwcore/ioports.h>
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#include "tty.h"
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/*
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* Keyboard ports and commands.
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*
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* @see Ralf Brown's interrupt (and port) list
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* http://www-2.cs.cmu.edu/~ralf/files.html
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*/
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#define KBD_DATA_PORT 0x60
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#define KBD_BREAKCODE_LIMIT 0x80
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#define KBD_EXTENDED_SCANCODE 0xE0
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#define KBD_IS_MAKECODE(c) ((c) < KBD_BREAKCODE_LIMIT)
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#define KBD_IS_BREAKCODE(c) ((c) >= KBD_BREAKCODE_LIMIT)
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#define KBD_BREAKCODE_2_MAKECODE(c) ((c) ^ KBD_BREAKCODE_LIMIT)
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#define KBD_LEFTSHIFT_SCANCODE 0x2a
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#define KBD_RIGHTSHIFT_SCANCODE 0x36
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typedef sos_ui8_t scancode_t;
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extern const char *kbd_regular_translate_table [];
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extern const char *kbd_shift_translate_table [];
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static const char **kbd_current_translate_table = kbd_regular_translate_table;
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static int is_ext = FALSE;
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static struct tty_device *tty;
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static void kbd_irq_handler (int irq_level)
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{
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scancode_t scancode;
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const char *key = NULL;
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scancode = inb (KBD_DATA_PORT);
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/* Mark that next interrupt wil give an extended scancode */
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if (scancode == KBD_EXTENDED_SCANCODE)
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{
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is_ext = TRUE;
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}
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/* Handle extended scancode */
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else if (is_ext)
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{
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is_ext = FALSE;
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}
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/* Normal scancode */
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else
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{
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/* Keypressed */
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if (KBD_IS_MAKECODE(scancode))
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{
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/* If shift, change translation table */
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if ((scancode == KBD_LEFTSHIFT_SCANCODE) ||
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(scancode == KBD_RIGHTSHIFT_SCANCODE))
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kbd_current_translate_table = kbd_shift_translate_table;
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/* If normal key, compute the result using the translation
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tables and the booleans */
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else if (kbd_current_translate_table[scancode])
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{
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key = kbd_current_translate_table[scancode];
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}
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}
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/* Key released */
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else
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{
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scancode_t makecode = KBD_BREAKCODE_2_MAKECODE(scancode);
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if ((makecode == KBD_LEFTSHIFT_SCANCODE) ||
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(makecode == KBD_RIGHTSHIFT_SCANCODE))
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kbd_current_translate_table = kbd_regular_translate_table;
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}
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}
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if (key)
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tty_add_chars (tty, key);
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}
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sos_ret_t sos_kbd_subsystem_setup(struct tty_device *t)
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{
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tty = t;
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sos_irq_set_routine (SOS_IRQ_KEYBOARD, kbd_irq_handler);
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return SOS_OK;
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}
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