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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. #include <bool.h>
  46.  
  47. #define SKI_GETCHAR     21
  48.  
  49. #define POLL_INTERVAL       10000
  50.  
  51. static void *ski_thread_impl(void *arg);
  52. static int32_t ski_getchar(void);
  53.  
  54. static volatile bool polling_disabled = false;
  55.  
  56. /** Initialize Ski port driver. */
  57. int kbd_port_init(void)
  58. {
  59.     thread_id_t tid;
  60.     int rc;
  61.  
  62.     rc = thread_create(ski_thread_impl, NULL, "kbd_poll", &tid);
  63.     if (rc != 0) {
  64.         return rc;
  65.     }
  66.  
  67.     return 0;
  68. }
  69.  
  70. void kbd_port_yield(void)
  71. {
  72.     polling_disabled = true;
  73. }
  74.  
  75. void kbd_port_reclaim(void)
  76. {
  77.     polling_disabled = false;
  78. }
  79.  
  80. /** Thread to poll Ski for keypresses. */
  81. static void *ski_thread_impl(void *arg)
  82. {
  83.     int32_t c;
  84.     (void) arg;
  85.  
  86.     while (1) {
  87.         while (polling_disabled == false) {
  88.             c = ski_getchar();
  89.             if (c == 0)
  90.                 break;
  91.             kbd_push_scancode(c);
  92.         }
  93.  
  94.         usleep(POLL_INTERVAL);
  95.     }
  96. }
  97.  
  98. /** Ask Ski if a key was pressed.
  99.  *
  100.  * Use SSC (Simulator System Call) to get character from the debug console.
  101.  * This call is non-blocking.
  102.  *
  103.  * @return ASCII code of pressed key or 0 if no key pressed.
  104.  */
  105. static int32_t ski_getchar(void)
  106. {
  107.     uint64_t ch;
  108.    
  109.     asm volatile (
  110.         "mov r15 = %1\n"
  111.         "break 0x80000;;\n" /* modifies r8 */
  112.         "mov %0 = r8;;\n"      
  113.  
  114.         : "=r" (ch)
  115.         : "i" (SKI_GETCHAR)
  116.         : "r15", "r8"
  117.     );
  118.  
  119.     return (int32_t) ch;
  120. }
  121.  
  122. /** @}
  123.  */
  124.