grub-core/term/morse.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2011,2012,2013  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/term.h>
  20 #include <grub/misc.h>
  21 #include <grub/types.h>
  22 #include <grub/err.h>
  23 #include <grub/dl.h>
  24 #include <grub/time.h>
  25 #include <grub/speaker.h>
  26
  27 GRUB_MOD_LICENSE ("GPLv3+");
  28
  29 #define BASE_TIME 250
  30 #define DIH 1
  31 #define DAH 3
  32 #define END 0
  33
  34 static const char codes[0x80][6] =
  35   {
  36     ['0'] = { DAH, DAH, DAH, DAH, DAH, END },
  37     ['1'] = { DIH, DAH, DAH, DAH, DAH, END },
  38     ['2'] = { DIH, DIH, DAH, DAH, DAH, END },
  39     ['3'] = { DIH, DIH, DIH, DAH, DAH, END },
  40     ['4'] = { DIH, DIH, DIH, DIH, DAH, END },
  41     ['5'] = { DIH, DIH, DIH, DIH, DIH, END },
  42     ['6'] = { DAH, DIH, DIH, DIH, DIH, END },
  43     ['7'] = { DAH, DAH, DIH, DIH, DIH, END },
  44     ['8'] = { DAH, DAH, DAH, DIH, DIH, END },
  45     ['9'] = { DAH, DAH, DAH, DAH, DIH, END },
  46     ['a'] = { DIH, DAH, END },
  47     ['b'] = { DAH, DIH, DIH, DIH, END },
  48     ['c'] = { DAH, DIH, DAH, DIH, END },
  49     ['d'] = { DAH, DIH, DIH, END },
  50     ['e'] = { DIH, END },
  51     ['f'] = { DIH, DIH, DAH, DIH, END },
  52     ['g'] = { DAH, DAH, DIH, END },
  53     ['h'] = { DIH, DIH, DIH, DIH, END },
  54     ['i'] = { DIH, DIH, END },
  55     ['j'] = { DIH, DAH, DAH, DAH, END },
  56     ['k'] = { DAH, DIH, DAH, END },
  57     ['l'] = { DIH, DAH, DIH, DIH, END },
  58     ['m'] = { DAH, DAH, END },
  59     ['n'] = { DAH, DIH, END },
  60     ['o'] = { DAH, DAH, DAH, END },
  61     ['p'] = { DIH, DAH, DAH, DIH, END },
  62     ['q'] = { DAH, DAH, DIH, DAH, END },
  63     ['r'] = { DIH, DAH, DIH, END },
  64     ['s'] = { DIH, DIH, DIH, END },
  65     ['t'] = { DAH, END },
  66     ['u'] = { DIH, DIH, DAH, END },
  67     ['v'] = { DIH, DIH, DIH, DAH, END },
  68     ['w'] = { DIH, DAH, DAH, END },
  69     ['x'] = { DAH, DIH, DIH, DAH, END },
  70     ['y'] = { DAH, DIH, DAH, DAH, END },
  71     ['z'] = { DAH, DAH, DIH, DIH, END }
  72   };
  73
  74 static void
  75 grub_audio_tone (int length)
  76 {
  77   grub_speaker_beep_on (1000);
  78   grub_millisleep (length);
  79   grub_speaker_beep_off ();
  80 }
  81
  82 static void
  83 grub_audio_putchar (struct grub_term_output *term __attribute__ ((unused)),
  84                     const struct grub_unicode_glyph *c_in)
  85 {
  86   grub_uint8_t c;
  87   int i;
  88
  89   /* For now, do not try to use a surrogate pair.  */
  90   if (c_in->base > 0x7f)
  91     c = '?';
  92   else
  93     c = grub_tolower (c_in->base);
  94   for (i = 0; codes[c][i]; i++)
  95     {
  96       grub_audio_tone (codes[c][i] * BASE_TIME);
  97       grub_millisleep (BASE_TIME);
  98     }
  99   grub_millisleep (2 * BASE_TIME);
 100 }
 101
 102
 103 static int
 104 dummy (void)
 105 {
 106   return 0;
 107 }
 108
 109 static struct grub_term_output grub_audio_term_output =
 110   {
 111    .name = "morse",
 112    .init = (void *) dummy,
 113    .fini = (void *) dummy,
 114    .putchar = grub_audio_putchar,
 115    .getwh = (void *) dummy,
 116    .getxy = (void *) dummy,
 117    .gotoxy = (void *) dummy,
 118    .cls = (void *) dummy,
 119    .setcolorstate = (void *) dummy,
 120    .setcursor = (void *) dummy,
 121    .flags = GRUB_TERM_CODE_TYPE_ASCII | GRUB_TERM_DUMB,
 122    .progress_update_divisor = GRUB_PROGRESS_NO_UPDATE
 123   };
 124
 125 GRUB_MOD_INIT (morse)
 126 {
 127   grub_term_register_output ("audio", &grub_audio_term_output);
 128 }
 129
 130 GRUB_MOD_FINI (morse)
 131 {
 132   grub_term_unregister_output (&grub_audio_term_output);
 133 }