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4043 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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4092 decky 29
/** @addtogroup genarch
4043 jermar 30
 * @{
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 */
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/**
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 * @file
4092 decky 34
 * @brief Serial line processing.
4043 jermar 35
 */
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#include <genarch/srln/srln.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>
4223 decky 42
#include <string.h>
4043 jermar 43
 
4311 decky 44
static indev_operations_t srln_raw_ops = {
4092 decky 45
    .poll = NULL
4043 jermar 46
};
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static void ksrln(void *arg)
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{
4311 decky 50
    srln_instance_t *instance = (srln_instance_t *) arg;
4092 decky 51
    bool cr = false;
4223 decky 52
    uint32_t escape = 0;
4092 decky 53
 
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    while (true) {
4311 decky 55
        wchar_t ch = indev_pop_character(&instance->raw);
4043 jermar 56
 
4223 decky 57
        /* ANSI escape sequence processing */
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        if (escape != 0) {
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            escape <<= 8;
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            escape |= ch & 0xff;
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            if ((escape == 0x1b4f) || (escape == 0x1b5b) || (escape == 0x1b5b33))
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                continue;
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            switch (escape) {
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            case 0x1b4f46:
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            case 0x1b5b46:
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                ch = U_END_ARROW;
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                escape = 0;
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                break;
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            case 0x1b4f48:
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            case 0x1b5b48:
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                ch = U_HOME_ARROW;
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                escape = 0;
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                break;
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            case 0x1b5b41:
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                ch = U_UP_ARROW;
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                escape = 0;
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                break;
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            case 0x1b5b42:
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                ch = U_DOWN_ARROW;
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                escape = 0;
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                break;
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            case 0x1b5b43:
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                ch = U_RIGHT_ARROW;
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                escape = 0;
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                break;
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            case 0x1b5b44:
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                ch = U_LEFT_ARROW;
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                escape = 0;
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                break;
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            case 0x1b5b337e:
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                ch = U_DELETE;
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                escape = 0;
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                break;
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            default:
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                escape = 0;
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            }
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        }
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        if (ch == 0x1b) {
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            escape = ch & 0xff;
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            continue;
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        }
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        /* Replace carriage return with line feed
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           and suppress any following line feed */
4092 decky 108
        if ((ch == '\n') && (cr)) {
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            cr = false;
4043 jermar 110
            continue;
4092 decky 111
        }
4043 jermar 112
 
4092 decky 113
        if (ch == '\r') {
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            ch = '\n';
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            cr = true;
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        } else
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            cr = false;
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4223 decky 119
        /* Backspace */
4092 decky 120
        if (ch == 0x7f)
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            ch = '\b';
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4311 decky 123
        indev_push_character(instance->sink, ch);
4043 jermar 124
    }
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}
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4311 decky 127
srln_instance_t *srln_init(void)
4043 jermar 128
{
4311 decky 129
    srln_instance_t *instance
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        = malloc(sizeof(srln_instance_t), FRAME_ATOMIC);
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    if (instance) {
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        instance->thread
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            = thread_create(ksrln, (void *) instance, TASK, 0, "ksrln", false);
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        if (!instance->thread) {
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            free(instance);
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            return NULL;
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        }
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        instance->sink = NULL;
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        indev_initialize("srln", &instance->raw, &srln_raw_ops);
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    }
4043 jermar 143
 
4311 decky 144
    return instance;
4043 jermar 145
}
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4311 decky 147
indev_t *srln_wire(srln_instance_t *instance, indev_t *sink)
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{
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    ASSERT(instance);
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    ASSERT(sink);
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    instance->sink = sink;
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    thread_ready(instance->thread);
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    return &instance->raw;
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}
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4043 jermar 158
/** @}
4052 jermar 159
 */