Subversion Repositories HelenOS-historic

/*

 * Copyright (C) 2006 Josef Cejka

 * 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.

 */

#include <ipc/ipc.h>

#include <ipc/services.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <ipc/ns.h>

#include <errno.h>

#include <arch/kbd.h>

#include <kbd.h>

#include <key_buffer.h>

#include <fifo.h>

#define NAME "KBD"

#define KBD_REQUEST_MAX 32 /**< Maximum requests buffered until keypress */

int main(int argc, char **argv)

{

    ipc_call_t call;

    ipc_callid_t callid;

    char connected = 0;

    int res;

    int c;

    ipcarg_t phonead;

    ipcarg_t retval, arg1, arg2;

    /* Counter of unsatisfied calls */

    fifo_count_t callers_counter = 0;

    /* Fifo with callid's of unsatisfied calls requred for answer */

    FIFO_INITIALIZE_STATIC(callers_buffer, ipc_callid_t, KBD_REQUEST_MAX);

    printf("Uspace kbd service started.\n");

    /* Initialize arch dependent parts */

    if (!(res = kbd_arch_init())) {

            printf("Kbd registration failed with retval %d.\n", res);

            return -1;

            };

    /* Initialize key buffer */

    key_buffer_init();

    /* Register service at nameserver */

    printf("%s: Registering at naming service.\n", NAME);

    if ((res = ipc_connect_to_me(PHONE_NS, SERVICE_KEYBOARD, 0, &phonead)) != 0) {

        printf("%s: Error: Registering at naming service failed.\n", NAME);

        return -1;

    };

    while (1) {

        callid = ipc_wait_for_call(&call, 0);

    //  printf("%s:Call phone=%lX..", NAME, call.in_phone_hash);

        switch (IPC_GET_METHOD(call)) {

            case IPC_M_PHONE_HUNGUP:

                if (connected) {

                    /* If nobody's connected, clear keybuffer and dont store new keys */

                    if (--connected == 0) {

                        callers_counter = 0;

                        callers_buffer.head = callers_buffer.tail = 0;

                        key_buffer_free(); 

                    }

                    printf("%s: Phone hung up.\n", NAME);

                } else {

                    printf("%s: Oops, got phone hung up, but nobody connected.\n", NAME);

                }

                retval = 0;

                break;

            case IPC_M_CONNECT_ME_TO:

            //  printf("%s: Connect me (%P) to: %zd\n",NAME, IPC_GET_ARG3(call), IPC_GET_ARG1(call));

                /* Only one connected client allowed */

                if (connected) {

                    retval = ELIMIT;

                } else {

                    retval = 0;

                    connected = 1;

                }

                break;

            case IPC_M_INTERRUPT:

                if (connected) {

                    /* recode scancode and store it into key buffer */

                    kbd_arch_process(IPC_GET_ARG2(call));

                    //printf("%s: GOT INTERRUPT: %c\n", NAME, IPC_GET_ARG2(call));

                    /* Some callers could awaiting keypress - if its true, we have to send keys to them.

                     * One interrupt can store more than one key into buffer. */

                    retval = 0;

                    arg2 = 0xbeef;

                    while ((callers_counter) && (!key_buffer_empty())) {

                        callers_counter--;

                        if (!key_buffer_pop((char *)&arg1)) {

                            printf("%s: KeyBuffer empty but it should not be.\n");

                            break;

                        }

                        ipc_answer_fast(fifo_pop(callers_buffer), retval, arg1, arg2);

                    }

                }

                break;

            case KBD_GETCHAR:

    //          printf("%s: Getchar: ", NAME);

                retval = 0;

                arg1 = 0;  

                if (!key_buffer_pop((char *)&arg1)) {

                    if (callers_counter < KBD_REQUEST_MAX) {

                        callers_counter++;

                        fifo_push(callers_buffer, callid);

                    } else {

                        retval = ELIMIT;

                    }

                    continue;

                };

                arg2 = 0xbeef;

            //  printf("GetChar return %c\n", arg1);

                break;

            default:

                printf("%s: Unknown method: %zd\n", NAME, IPC_GET_METHOD(call));

                retval = ENOENT;

                break;

        }

        if (! (callid & IPC_CALLID_NOTIFICATION)) {

            ipc_answer_fast(callid, retval, arg1, arg2);

        }

    }

}