1 | /*
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2 | * Copyright (C) 2017 The Contributors
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3 | *
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4 | * This program is free software: you can redistribute it and/or modify
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5 | * it under the terms of the GNU General Public License as published by
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6 | * the Free Software Foundation, either version 3 of the License, or (at
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7 | * your option) any later version.
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8 | *
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9 | * This program is distributed in the hope that it will be useful, but
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10 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 | * General Public License for more details.
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13 | *
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14 | * A copy of the GNU General Public License can be found in the file
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15 | * "gpl.txt" in the top directory of this repository.
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16 | */
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17 |
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18 | #include <all.h>
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19 |
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20 | #define ver(...) _ver(kbd_verbose, 0, __VA_ARGS__)
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21 | #define ver2(...) _ver(kbd_verbose, 1, __VA_ARGS__)
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22 | #define ver3(...) _ver(kbd_verbose, 2, __VA_ARGS__)
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23 |
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24 | int32_t kbd_verbose = 0;
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25 |
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26 | #define BUF_SZ 16
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27 |
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28 | static int32_t buf_hd = 0;
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29 | static int32_t buf_tl = 0;
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30 | static uint8_t buf[BUF_SZ];
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31 |
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32 | static uint8_t reg = 0;
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33 | static bool irq = false;
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34 |
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35 | static void xmit(void)
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36 | {
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37 | ver2("kbd xmit %d %d", buf_tl, buf_hd);
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38 |
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39 | if (buf_tl >= buf_hd) {
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40 | return;
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41 | }
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42 |
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43 | reg = buf[buf_tl % BUF_SZ];
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44 | irq = true;
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45 | ver2("kbd xmit 0x%02x", reg);
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46 |
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47 | ++buf_tl;
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48 |
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49 | if (buf_tl >= BUF_SZ) {
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50 | buf_hd -= BUF_SZ;
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51 | buf_tl -= BUF_SZ;
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52 | ver2("kbd adj %d %d", buf_tl, buf_hd);
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53 | }
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54 | }
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55 |
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56 | static void out(uint8_t c)
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57 | {
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58 | ver2("kbd out %d %d 0x%02x", buf_tl, buf_hd, c);
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59 |
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60 | if (SDL_LockMutex(cpu_mutex) < 0) {
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61 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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62 | }
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63 |
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64 | if (buf_hd >= buf_tl + BUF_SZ) {
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65 | err("keyboard port losing data");
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66 | }
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67 | else {
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68 | buf[buf_hd % BUF_SZ] = c;
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69 | ++buf_hd;
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70 |
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71 | if (!irq) {
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72 | xmit();
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73 | }
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74 | }
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75 |
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76 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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77 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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78 | }
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79 | }
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80 |
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81 | static void but_on(int32_t sig)
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82 | {
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83 | out((uint8_t)(0x80 | sig));
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84 | out(0x01);
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85 | }
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86 |
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87 | static void but_off(int32_t sig)
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88 | {
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89 | out((uint8_t)(0x80 | sig));
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90 | out(0x00);
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91 | }
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92 |
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93 | static void key_touch(int32_t sig, int32_t val)
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94 | {
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95 | out((uint8_t)(0x80 | sig));
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96 | out(0x01);
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97 | out((uint8_t)val);
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98 | }
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99 |
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100 | static void key_off(int32_t sig)
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101 | {
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102 | out((uint8_t)(0x80 | sig));
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103 | out(0x00);
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104 | }
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105 |
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106 | #if defined NOT_YET
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107 | static void pot_128(int32_t sig, int32_t val)
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108 | {
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109 | out((uint8_t)(0x80 | sig));
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110 | out((uint8_t)val);
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111 | }
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112 |
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113 | static void pot_256(int32_t sig, int32_t val)
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114 | {
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115 | out((uint8_t)(0x80 | sig));
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116 | out((uint8_t)((val >> 7) & 0x01));
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117 | out((uint8_t)(val & 0x7f));
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118 | }
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119 | #endif
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120 |
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121 | void kbd_key(SDL_KeyboardEvent *ev, bool dn)
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122 | {
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123 | if ((ev->keysym.mod & KMOD_SHIFT) != 0 &&
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124 | ev->keysym.sym >= SDLK_a && ev->keysym.sym <= SDLK_x) {
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125 | int32_t i = ev->keysym.sym - SDLK_a;
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126 | ver2("kbd key %d %s", i, dn ? "dn" : "up");
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127 |
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128 | if (dn) {
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129 | key_touch(1 + i, 0x7f);
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130 | }
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131 | else {
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132 | key_off(1 + i);
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133 | }
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134 |
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135 | return;
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136 | }
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137 |
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138 | int32_t sig;
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139 |
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140 | if (ev->keysym.sym >= SDLK_0 && ev->keysym.sym <= '9') {
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141 | int32_t i = ev->keysym.sym - SDLK_0;
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142 | ver2("kbd dat %d %s", i, dn ? "dn" : "up");
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143 | sig = 60 + i;
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144 | }
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145 | else {
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146 | switch (ev->keysym.sym) {
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147 | case SDLK_x:
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148 | ver2("kbd x %s", dn ? "dn" : "up");
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149 | sig = 70;
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150 | break;
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151 |
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152 | case SDLK_e:
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153 | ver2("kbd e %s", dn ? "dn" : "up");
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154 | sig = 71;
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155 | break;
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156 |
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157 | case SDLK_m:
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158 | ver2("kbd m %s", dn ? "dn" : "up");
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159 | sig = 72;
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160 | break;
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161 |
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162 | default:
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163 | return;
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164 | }
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165 | }
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166 |
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167 | if (dn) {
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168 | but_on(sig);
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169 | }
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170 | else {
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171 | but_off(sig);
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172 | }
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173 | }
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174 |
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175 | void kbd_init(void)
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176 | {
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177 | ver("kbd init");
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178 | }
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179 |
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180 | void kbd_quit(void)
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181 | {
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182 | ver("kbd quit");
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183 | }
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184 |
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185 | bool kbd_exec(void)
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186 | {
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187 | ver3("kbd exec");
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188 | return irq;
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189 | }
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190 |
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191 | uint32_t kbd_read(uint32_t off, int32_t sz)
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192 | {
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193 | ver2("kbd rd %u:%d", off, sz * 8);
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194 |
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195 | if (sz != 1 || off > 0) {
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196 | fail("invalid kbd rd %u:%d", off, sz * 8);
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197 | }
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198 |
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199 | irq = false;
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200 | uint32_t res = reg;
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201 |
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202 | xmit();
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203 |
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204 | return res;
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205 | }
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206 |
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207 | void kbd_write(uint32_t off, int32_t sz, uint32_t val)
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208 | {
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209 | ver2("kbd wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
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210 | fail("invalid kbd wr %u:%d", off, sz * 8);
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211 | }
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