source: mainline/kbd/generic/kbd.c@ 5bd03eb

/*
 * 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 <libadt/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);
        //      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);
                }
        }
}