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  1. /*
  2.  * Copyright (c) 2005 Jakub Jermar
  3.  * Copyright (c) 2009 Jiri Svoboda
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup kbd_port
  31.  * @ingroup  kbd
  32.  * @{
  33.  */
  34. /** @file
  35.  * @brief   Ski console keyboard port driver.
  36.  */
  37.  
  38.  
  39. #include <stdlib.h>
  40. #include <unistd.h>
  41. #include <kbd.h>
  42. #include <kbd_port.h>
  43. #include <sys/types.h>
  44. #include <thread.h>
  45.  
  46. #define SKI_GETCHAR     21
  47.  
  48. #define POLL_INTERVAL       10000
  49.  
  50. static void *ski_thread_impl(void *arg);
  51. static int32_t ski_getchar(void);
  52.  
  53. /** Initialize Ski port driver. */
  54. int kbd_port_init(void)
  55. {
  56.     thread_id_t tid;
  57.     int rc;
  58.  
  59.     rc = thread_create(ski_thread_impl, NULL, "kbd_poll", &tid);
  60.     if (rc != 0) {
  61.         return rc;
  62.     }
  63.  
  64.     return 0;
  65. }
  66.  
  67. /** Thread to poll Ski for keypresses. */
  68. static void *ski_thread_impl(void *arg)
  69. {
  70.     int32_t c;
  71.     (void) arg;
  72.  
  73.     while (1) {
  74.         while (1) {
  75.             c = ski_getchar();
  76.             if (c == 0)
  77.                 break;
  78.             kbd_push_scancode(c);
  79.         }
  80.  
  81.         usleep(POLL_INTERVAL);
  82.     }
  83. }
  84.  
  85. /** Ask Ski if a key was pressed.
  86.  *
  87.  * Use SSC (Simulator System Call) to get character from the debug console.
  88.  * This call is non-blocking.
  89.  *
  90.  * @return ASCII code of pressed key or 0 if no key pressed.
  91.  */
  92. static int32_t ski_getchar(void)
  93. {
  94.     uint64_t ch;
  95.    
  96.     asm volatile (
  97.         "mov r15 = %1\n"
  98.         "break 0x80000;;\n" /* modifies r8 */
  99.         "mov %0 = r8;;\n"      
  100.  
  101.         : "=r" (ch)
  102.         : "i" (SKI_GETCHAR)
  103.         : "r15", "r8"
  104.     );
  105.  
  106.     return (int32_t) ch;
  107. }
  108.  
  109. /** @}
  110.  */
  111.