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  1. /*
  2.  * Copyright (C) 2006 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <ipc.h>
  30. #include <services.h>
  31. #include <stdio.h>
  32. #include <unistd.h>
  33. #include <stdlib.h>
  34. #include <ns.h>
  35. #include <errno.h>
  36. #include <arch/kbd.h>
  37. #include <kbd.h>
  38. #include <key_buffer.h>
  39. #include <fifo.h>
  40.  
  41. #define NAME "KBD"
  42.  
  43. #define KBD_REQUEST_MAX 32 /**< Maximum requests buffered until keypress */
  44.  
  45. int main(int argc, char **argv)
  46. {
  47.     ipc_call_t call;
  48.     ipc_callid_t callid;
  49.     char connected = 0;
  50.     int res;
  51.     int c;
  52.     ipcarg_t phonead;
  53.    
  54.     ipcarg_t retval, arg1, arg2;
  55.  
  56.     /* Counter of unsatisfied calls */
  57.     fifo_count_t callers_counter = 0;
  58.     /* Fifo with callid's of unsatisfied calls requred for answer */
  59.     FIFO_INITIALIZE_STATIC(callers_buffer, ipc_callid_t, KBD_REQUEST_MAX);
  60.  
  61.     printf("Uspace kbd service started.\n");
  62.  
  63.     /* Initialize arch dependent parts */
  64.     if (!(res = kbd_arch_init())) {
  65.             printf("Kbd registration failed with retval %d.\n", res);
  66.             return -1;
  67.             };
  68.    
  69.     /* Initialize key buffer */
  70.     key_buffer_init();
  71.    
  72.     /* Register service at nameserver */
  73.     printf("%s: Registering at naming service.\n", NAME);
  74.  
  75.     if ((res = ipc_connect_to_me(PHONE_NS, SERVICE_KEYBOARD, 0, &phonead)) != 0) {
  76.         printf("%s: Error: Registering at naming service failed.\n", NAME);
  77.         return -1;
  78.     };
  79.    
  80.     while (1) {
  81.         callid = ipc_wait_for_call(&call, 0);
  82.     //  printf("%s:Call phone=%lX..", NAME, call.in_phone_hash);
  83.         switch (IPC_GET_METHOD(call)) {
  84.             case IPC_M_PHONE_HUNGUP:
  85.                 if (connected) {
  86.                     /* If nobody's connected, clear keybuffer and dont store new keys */
  87.                     if (--connected == 0) {
  88.                         callers_counter = 0;
  89.                         callers_buffer.head = callers_buffer.tail = 0;
  90.                         key_buffer_free(); 
  91.                     }
  92.                    
  93.                     printf("%s: Phone hung up.\n", NAME);
  94.                 } else {
  95.                     printf("%s: Oops, got phone hung up, but nobody connected.\n", NAME);
  96.                 }
  97.                
  98.                 retval = 0;
  99.                 break;
  100.             case IPC_M_CONNECT_ME_TO:
  101.             //  printf("%s: Connect me (%P) to: %zd\n",NAME, IPC_GET_ARG3(call), IPC_GET_ARG1(call));
  102.                 /* Only one connected client allowed */
  103.                 if (connected) {
  104.                     retval = ELIMIT;
  105.                 } else {
  106.                     retval = 0;
  107.                     connected = 1;
  108.                 }
  109.                 break;
  110.             case IPC_M_INTERRUPT:
  111.                 if (connected) {
  112.                     /* recode scancode and store it into key buffer */
  113.                     kbd_arch_process(IPC_GET_ARG2(call));
  114.                     //printf("%s: GOT INTERRUPT: %c\n", NAME, IPC_GET_ARG2(call));
  115.  
  116.                     /* Some callers could awaiting keypress - if its true, we have to send keys to them.
  117.                      * One interrupt can store more than one key into buffer. */
  118.                     retval = 0;
  119.                     arg2 = 0xbeef;
  120.                     while ((callers_counter) && (!key_buffer_empty())) {
  121.                         callers_counter--;
  122.                         if (!key_buffer_pop((char *)&arg1)) {
  123.                             printf("%s: KeyBuffer empty but it should not be.\n");
  124.                             break;
  125.                         }
  126.                         ipc_answer_fast(fifo_pop(callers_buffer), retval, arg1, arg2);
  127.                     }
  128.                 }
  129.                 break;
  130.             case KBD_GETCHAR:
  131.     //          printf("%s: Getchar: ", NAME);
  132.                 retval = 0;
  133.                 arg1 = 0;  
  134.                 if (!key_buffer_pop((char *)&arg1)) {
  135.                     if (callers_counter < KBD_REQUEST_MAX) {
  136.                         callers_counter++;
  137.                         fifo_push(callers_buffer, callid);
  138.                     } else {
  139.                         retval = ELIMIT;
  140.                     }
  141.                     continue;
  142.                 };
  143.                 arg2 = 0xbeef;
  144.             //  printf("GetChar return %c\n", arg1);
  145.                
  146.                 break;
  147.             default:
  148.                 printf("%s: Unknown method: %zd\n", NAME, IPC_GET_METHOD(call));
  149.                 retval = ENOENT;
  150.                 break;
  151.         }
  152.  
  153.         if (! (callid & IPC_CALLID_NOTIFICATION)) {
  154.             ipc_answer_fast(callid, retval, arg1, arg2);
  155.         }
  156.     }
  157. }
  158.  
  159.