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1 jermar 1 
/*
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 * Copyright (c) 2009 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genarch
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 * @{
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 */
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/**
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 * @file
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 * @brief Keyboard processing.
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 */
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#include <genarch/kbrd/kbrd.h>
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#include <genarch/kbrd/scanc.h>
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#ifdef CONFIG_PC_KBD
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#include <genarch/kbrd/scanc_pc.h>
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#endif
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#ifdef CONFIG_SUN_KBD
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#include <genarch/kbrd/scanc_sun.h>
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#endif
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#include <synch/spinlock.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <macros.h>
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#define IGNORE_CODE  0x7f
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#define KEY_RELEASE  0x80
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#define PRESSED_SHIFT     (1 << 0)
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#define PRESSED_CAPSLOCK  (1 << 1)
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#define LOCKED_CAPSLOCK   (1 << 0)
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static indev_t kbrdout;
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indev_operations_t kbrdout_ops = {
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    .poll = NULL
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};
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SPINLOCK_INITIALIZE(keylock);   /**< keylock protects keyflags and lockflags. */
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static volatile int keyflags;   /**< Tracking of multiple keypresses. */
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static volatile int lockflags;  /**< Tracking of multiple keys lockings. */
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/** Process release of key.
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 *
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 * @param sc Scancode of the key being released.
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 */
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static void key_released(wchar_t sc)
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{
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    spinlock_lock(&keylock);
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    switch (sc) {
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    case SC_LSHIFT:
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    case SC_RSHIFT:
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        keyflags &= ~PRESSED_SHIFT;
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        break;
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    case SC_CAPSLOCK:
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        keyflags &= ~PRESSED_CAPSLOCK;
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        if (lockflags & LOCKED_CAPSLOCK)
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            lockflags &= ~LOCKED_CAPSLOCK;
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        else
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            lockflags |= LOCKED_CAPSLOCK;
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        break;
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    default:
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        break;
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    }
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    spinlock_unlock(&keylock);
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}
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/** Process keypress.
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 *
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 * @param sc Scancode of the key being pressed.
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 */
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static void key_pressed(wchar_t sc)
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{
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    bool letter;
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    bool shift;
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    bool capslock;
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    spinlock_lock(&keylock);
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    switch (sc) {
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    case SC_LSHIFT:
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    case SC_RSHIFT:
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        keyflags |= PRESSED_SHIFT;
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        break;
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    case SC_CAPSLOCK:
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        keyflags |= PRESSED_CAPSLOCK;
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        break;
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    case SC_SCAN_ESCAPE:
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        break;
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    default:
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        letter = islower(sc_primary_map[sc]);
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        shift = keyflags & PRESSED_SHIFT;
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        capslock = (keyflags & PRESSED_CAPSLOCK) ||
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            (lockflags & LOCKED_CAPSLOCK);
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        if ((letter) && (capslock))
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            shift = !shift;
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        if (shift)
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            indev_push_character(stdin, sc_secondary_map[sc]);
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        else
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            indev_push_character(stdin, sc_primary_map[sc]);
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        break;
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    }
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    spinlock_unlock(&keylock);
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}
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static void kkbrd(void *arg)
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{
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    indev_t *in = (indev_t *) arg;
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    while (true) {
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        wchar_t sc = _getc(in);
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        if (sc == IGNORE_CODE)
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            continue;
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        if (sc & KEY_RELEASE)
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            key_released((sc ^ KEY_RELEASE) & 0x7f);
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        else
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            key_pressed(sc & 0x7f);
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    }
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}
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void kbrd_init(indev_t *devin)
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{
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    indev_initialize("kbrd", &kbrdout, &kbrdout_ops);
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    thread_t *thread
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        = thread_create(kkbrd, devin, TASK, 0, "kkbrd", false);
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    if (thread) {
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        stdin = &kbrdout;
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        thread_ready(thread);
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    }
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}
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/** @}
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 */