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/*
 * Copyright (c) 2005 Jakub Jermar
 * Copyright (c) 2009 Jiri Svoboda
 * 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 kbd_port
 * @ingroup  kbd
 * @{
 */ 
/** @file
 * @brief   Ski console keyboard port driver.
 */


#include <stdlib.h>
#include <unistd.h>
#include <kbd.h>
#include <kbd_port.h>
#include <sys/types.h>
#include <thread.h>

#define SKI_GETCHAR     21

#define POLL_INTERVAL       10000

static void *ski_thread_impl(void *arg);
static int32_t ski_getchar(void);

/** Initialize Ski port driver. */
int kbd_port_init(void)
{
    thread_id_t tid;
    int rc;

    rc = thread_create(ski_thread_impl, NULL, "kbd_poll", &tid);
    if (rc != 0) {
        return rc;
    }

    return 0;
}

/** Thread to poll Ski for keypresses. */
static void *ski_thread_impl(void *arg)
{
    int32_t c;
    (void) arg;

    while (1) {
        c = ski_getchar();
        if (c != 0)
            kbd_push_scancode(c);

        usleep(POLL_INTERVAL);
    }
}

/** Ask Ski if a key was pressed.
 *
 * Use SSC (Simulator System Call) to get character from the debug console.
 * This call is non-blocking.
 *
 * @return ASCII code of pressed key or 0 if no key pressed.
 */
static int32_t ski_getchar(void)
{
    uint64_t ch;
    
    asm volatile (
        "mov r15 = %1\n"
        "break 0x80000;;\n" /* modifies r8 */
        "mov %0 = r8;;\n"       

        : "=r" (ch)
        : "i" (SKI_GETCHAR)
        : "r15", "r8"
    );

    return (int32_t) ch;
}

/** @}
 */