1 | /* |
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2 | * Copyright (c) 1999 Greg Haerr <greg@censoft.com> |
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3 | * Portions Copyright (c) 1991 David I. Bell |
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4 | * Permission is granted to use, distribute, or modify this source, |
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5 | * provided that this copyright notice remains intact. |
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6 | * |
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7 | * UNIX Serial Port Mouse Driver |
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8 | * |
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9 | * This driver opens a serial port directly, and interprets serial data. |
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10 | * Microsoft, PC, Logitech and PS/2 mice are supported. |
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11 | * The PS/2 mouse is only supported if the OS runs the mouse |
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12 | * byte codes through the serial port. |
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13 | * |
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14 | * The following environment variables control the mouse type expected |
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15 | * and the serial port to open. |
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16 | * |
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17 | * Environment Var Default Allowed |
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18 | * MOUSE_TYPE pc ms, pc, logi, ps2 |
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19 | */ |
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20 | #include <stdio.h> |
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21 | #include <stdlib.h> |
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22 | #include <unistd.h> |
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23 | #include <fcntl.h> |
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24 | #include <errno.h> |
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25 | |
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26 | #include <rtems.h> |
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27 | #include <bsp.h> |
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28 | #include "keyboard.h" |
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29 | #include "mouse_parser.h" |
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30 | #include "serial_mouse.h" |
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31 | |
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32 | |
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33 | /* NOTE NOTE NOTE NOTE: |
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34 | Select here the mouse type !!!!! |
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35 | */ |
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36 | #ifndef MOUSE_TYPE |
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37 | #define MOUSE_TYPE "ms" /* default mouse type "ms","pc","ps2" */ |
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38 | #endif |
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39 | |
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40 | /* states for the mouse*/ |
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41 | #define IDLE 0 /* start of byte sequence */ |
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42 | #define XSET 1 /* setting x delta */ |
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43 | #define YSET 2 /* setting y delta */ |
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44 | #define XADD 3 /* adjusting x delta */ |
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45 | #define YADD 4 /* adjusting y delta */ |
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46 | |
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47 | /* values in the bytes returned by the mouse for the buttons*/ |
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48 | #define PC_LEFT_BUTTON 4 |
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49 | #define PC_MIDDLE_BUTTON 2 |
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50 | #define PC_RIGHT_BUTTON 1 |
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51 | |
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52 | #define MS_LEFT_BUTTON 2 |
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53 | #define MS_RIGHT_BUTTON 1 |
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54 | |
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55 | #define PS2_CTRL_BYTE 0x08 |
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56 | #define PS2_LEFT_BUTTON 1 |
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57 | #define PS2_RIGHT_BUTTON 2 |
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58 | |
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59 | /* Bit fields in the bytes sent by the mouse.*/ |
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60 | #define TOP_FIVE_BITS 0xf8 |
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61 | #define BOTTOM_THREE_BITS 0x07 |
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62 | #define TOP_BIT 0x80 |
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63 | #define SIXTH_BIT 0x40 |
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64 | #define BOTTOM_TWO_BITS 0x03 |
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65 | #define THIRD_FOURTH_BITS 0x0c |
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66 | #define BOTTOM_SIX_BITS 0x3f |
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67 | |
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68 | /* local data*/ |
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69 | static int state; /* IDLE, XSET, ... */ |
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70 | static BUTTON buttons; /* current mouse buttons pressed*/ |
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71 | static BUTTON availbuttons; /* which buttons are available */ |
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72 | static COORD xd; /* change in x */ |
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73 | static COORD yd; /* change in y */ |
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74 | |
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75 | static int left; /* because the button values change */ |
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76 | static int middle; /* between mice, the buttons are */ |
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77 | static int right; /* redefined */ |
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78 | |
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79 | static int (*parse)( int ); /* parse routine */ |
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80 | |
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81 | /* local routines*/ |
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82 | static int ParsePC(int); /* routine to interpret PC mouse */ |
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83 | static int ParseMS(int); /* routine to interpret MS mouse */ |
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84 | static int ParsePS2(int); /* routine to interpret PS/2 mouse */ |
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85 | |
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86 | extern void uart_set_driver_handler( int port, void ( *handler )( void *, char *, int ) ); |
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87 | extern void kbd_set_driver_handler( void ( *handler )( void *, unsigned short, unsigned long ) ); |
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88 | extern void ps2_set_driver_handler( int port, void ( *handler )( void *, char *, int ) ); |
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89 | |
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90 | /* |
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91 | * Open up the mouse device. |
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92 | * Returns the fd if successful, or negative if unsuccessful. |
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93 | */ |
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94 | int MOU_Init() |
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95 | { |
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96 | char *type; |
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97 | |
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98 | /* get mouse type and port*/ |
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99 | type = MOUSE_TYPE; |
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100 | |
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101 | /* set button bits and parse procedure*/ |
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102 | if(!strcmp(type, "pc") || !strcmp(type, "logi")) { |
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103 | /* pc or logitech mouse*/ |
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104 | left = PC_LEFT_BUTTON; |
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105 | middle = PC_MIDDLE_BUTTON; |
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106 | right = PC_RIGHT_BUTTON; |
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107 | parse = ParsePC; |
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108 | } else if (strcmp(type, "ms") == 0) { |
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109 | /* microsoft mouse*/ |
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110 | left = MS_LEFT_BUTTON; |
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111 | right = MS_RIGHT_BUTTON; |
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112 | middle = 0; |
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113 | parse = ParseMS; |
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114 | } else if (strcmp(type, "ps2") == 0) { |
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115 | /* PS/2 mouse*/ |
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116 | left = PS2_LEFT_BUTTON; |
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117 | right = PS2_RIGHT_BUTTON; |
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118 | middle = 0; |
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119 | parse = ParsePS2; |
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120 | } else |
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121 | return -1; |
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122 | |
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123 | printk("Device: /dev/mouse -- mouse type is: %s\n", MOUSE_TYPE ); |
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124 | |
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125 | /* initialize data*/ |
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126 | availbuttons = left | middle | right; |
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127 | state = IDLE; |
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128 | buttons = 0; |
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129 | xd = 0; |
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130 | yd = 0; |
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131 | return 0; |
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132 | } |
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133 | |
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134 | /* |
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135 | * Attempt to read bytes from the mouse and interpret them. |
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136 | * Returns -1 on error, 0 if either no bytes were read or not enough |
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137 | * was read for a complete state, or 1 if the new state was read. |
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138 | * When a new state is read, the current buttons and x and y deltas |
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139 | * are returned. This routine does not block. |
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140 | */ |
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141 | int MOU_Data( int ch, COORD *dx, COORD *dy, COORD *dz, BUTTON *bptr) |
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142 | { |
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143 | int b; |
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144 | |
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145 | /* |
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146 | * Loop over all the bytes read in the buffer, parsing them. |
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147 | * When a complete state has been read, return the results, |
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148 | * leaving further bytes in the buffer for later calls. |
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149 | */ |
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150 | if( (*parse)( ch ) ) |
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151 | { |
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152 | *dx = xd; |
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153 | *dy = yd; |
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154 | *dz = 0; |
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155 | b = 0; |
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156 | if(buttons & left) |
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157 | b |= LBUTTON; |
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158 | if(buttons & right) |
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159 | b |= RBUTTON; |
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160 | if(buttons & middle) |
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161 | b |= MBUTTON; |
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162 | *bptr = b; |
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163 | return 1; |
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164 | } |
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165 | return 0; |
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166 | } |
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167 | |
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168 | /* |
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169 | * Input routine for PC mouse. |
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170 | * Returns nonzero when a new mouse state has been completed. |
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171 | */ |
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172 | static int ParsePC(int byte) |
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173 | { |
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174 | int sign; /* sign of movement */ |
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175 | |
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176 | switch (state) { |
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177 | case IDLE: |
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178 | if ((byte & TOP_FIVE_BITS) == TOP_BIT) { |
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179 | buttons = ~byte & BOTTOM_THREE_BITS; |
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180 | state = XSET; |
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181 | } |
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182 | break; |
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183 | |
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184 | case XSET: |
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185 | sign = 1; |
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186 | if (byte > 127) { |
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187 | byte = 256 - byte; |
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188 | sign = -1; |
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189 | } |
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190 | xd = byte * sign; |
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191 | state = YSET; |
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192 | break; |
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193 | |
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194 | case YSET: |
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195 | sign = 1; |
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196 | if (byte > 127) { |
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197 | byte = 256 - byte; |
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198 | sign = -1; |
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199 | } |
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200 | yd = -byte * sign; |
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201 | state = XADD; |
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202 | break; |
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203 | |
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204 | case XADD: |
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205 | sign = 1; |
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206 | if (byte > 127) { |
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207 | byte = 256 - byte; |
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208 | sign = -1; |
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209 | } |
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210 | xd += byte * sign; |
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211 | state = YADD; |
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212 | break; |
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213 | |
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214 | case YADD: |
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215 | sign = 1; |
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216 | if (byte > 127) { |
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217 | byte = 256 - byte; |
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218 | sign = -1; |
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219 | } |
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220 | yd -= byte * sign; |
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221 | state = IDLE; |
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222 | return 1; |
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223 | } |
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224 | return 0; |
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225 | } |
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226 | |
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227 | |
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228 | /* |
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229 | * Input routine for Microsoft mouse. |
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230 | * Returns nonzero when a new mouse state has been completed. |
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231 | */ |
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232 | static int ParseMS(int byte) |
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233 | { |
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234 | switch (state) { |
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235 | case IDLE: |
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236 | if (byte & SIXTH_BIT) { |
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237 | buttons = (byte >> 4) & BOTTOM_TWO_BITS; |
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238 | yd = ((byte & THIRD_FOURTH_BITS) << 4); |
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239 | xd = ((byte & BOTTOM_TWO_BITS) << 6); |
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240 | state = XADD; |
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241 | } |
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242 | break; |
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243 | |
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244 | case XADD: |
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245 | xd |= (byte & BOTTOM_SIX_BITS); |
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246 | state = YADD; |
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247 | break; |
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248 | |
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249 | case YADD: |
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250 | yd |= (byte & BOTTOM_SIX_BITS); |
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251 | state = IDLE; |
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252 | if (xd > 127) |
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253 | xd -= 256; |
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254 | if (yd > 127) |
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255 | yd -= 256; |
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256 | return 1; |
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257 | } |
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258 | return 0; |
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259 | } |
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260 | |
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261 | /* |
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262 | * Input routine for PS/2 mouse. |
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263 | * Returns nonzero when a new mouse state has been completed. |
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264 | */ |
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265 | static int ParsePS2(int byte) |
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266 | { |
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267 | switch (state) { |
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268 | case IDLE: |
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269 | if (byte & PS2_CTRL_BYTE) { |
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270 | buttons = byte & |
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271 | (PS2_LEFT_BUTTON|PS2_RIGHT_BUTTON); |
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272 | state = XSET; |
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273 | } |
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274 | break; |
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275 | |
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276 | case XSET: |
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277 | if(byte > 127) |
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278 | byte -= 256; |
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279 | xd = byte; |
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280 | state = YSET; |
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281 | break; |
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282 | |
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283 | case YSET: |
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284 | if(byte > 127) |
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285 | byte -= 256; |
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286 | yd = -byte; |
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287 | state = IDLE; |
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288 | return 1; |
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289 | } |
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290 | return 0; |
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291 | } |
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292 | |
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293 | static rtems_id queue_id = 0; |
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294 | |
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295 | /* generic keyboard parser */ |
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296 | static void mouse_parser( void *ptr, char *buffer, int size ) |
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297 | { |
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298 | COORD dx; |
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299 | COORD dy; |
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300 | COORD dz; |
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301 | BUTTON bptr; |
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302 | while( size-- ) |
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303 | { |
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304 | if( MOU_Data( *buffer++, &dx, &dy, &dz, &bptr ) ) |
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305 | { |
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306 | struct MW_UID_MESSAGE m; |
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307 | m.type = MV_UID_REL_POS; |
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308 | /* buttons definitons have been selected to match */ |
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309 | m.m.pos.btns = bptr; |
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310 | m.m.pos.x = dx; |
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311 | m.m.pos.y = dy; |
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312 | m.m.pos.z = dz; |
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313 | /* printk( "Mouse: msg: dx=%d, dy=%d, btn=%X\n", dx, dy, bptr ); */ |
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314 | rtems_message_queue_send( queue_id, ( void * )&m, sizeof( struct MW_UID_MESSAGE ) ); |
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315 | } |
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316 | } |
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317 | } |
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318 | |
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319 | /* enable the mouse to add messages to the queue */ |
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320 | void register_mou_msg_queue( char * q_name, int port ) |
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321 | { |
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322 | rtems_name queue_name; |
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323 | rtems_status_code status; |
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324 | queue_name = rtems_build_name( q_name[0], |
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325 | q_name[1], |
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326 | q_name[2], |
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327 | q_name[3] ); |
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328 | status = rtems_message_queue_ident( queue_name, RTEMS_LOCAL, &queue_id ); |
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329 | if( status != RTEMS_SUCCESSFUL ) |
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330 | { |
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331 | printk( "UID_Queue: error open queue: %d\n", status ); |
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332 | return; |
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333 | } |
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334 | MOU_Init(); |
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335 | if( port == -1 ) |
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336 | { |
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337 | /* we know the mouse type in this case, let's initialize everything */ |
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338 | left = PS2_LEFT_BUTTON; |
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339 | right = PS2_RIGHT_BUTTON; |
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340 | middle = 0; |
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341 | parse = ParsePS2; |
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342 | ps2_set_driver_handler( port, mouse_parser ); |
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343 | } |
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344 | else |
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345 | { |
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346 | uart_set_driver_handler( port, mouse_parser ); |
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347 | } |
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348 | } |
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349 | |
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350 | /* stop the mouse from adding messages to the queue */ |
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351 | void unregister_mou_msg_queue( int port ) |
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352 | { |
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353 | if( port == -1 ) |
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354 | { |
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355 | ps2_set_driver_handler( port, NULL ); |
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356 | } |
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357 | else |
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358 | { |
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359 | uart_set_driver_handler( port, NULL ); |
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360 | } |
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361 | } |
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362 | |
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363 | /* adds a kbd message to the queue */ |
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364 | static void kbd_parser( void *ptr, unsigned short keycode, unsigned long mods ) |
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365 | { |
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366 | struct MW_UID_MESSAGE m; |
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367 | struct kbd_struct * kbd = ( struct kbd_struct *)ptr; |
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368 | |
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369 | m.type = MV_UID_KBD; |
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370 | m.m.kbd.code = keycode; |
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371 | m.m.kbd.modifiers = kbd->ledflagstate; |
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372 | m.m.kbd.mode = kbd->kbdmode; |
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373 | /* printk( "kbd: msg: keycode=%X, mod=%X\n", keycode, mods ); */ |
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374 | rtems_message_queue_send( queue_id, ( void * )&m, |
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375 | sizeof( struct MW_UID_MESSAGE ) ); |
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376 | } |
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377 | |
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378 | void register_kbd_msg_queue( char *q_name, int port ) |
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379 | { |
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380 | rtems_name queue_name; |
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381 | rtems_status_code status; |
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382 | |
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383 | queue_name = rtems_build_name( q_name[0], |
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384 | q_name[1], |
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385 | q_name[2], |
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386 | q_name[3] ); |
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387 | status = rtems_message_queue_ident( queue_name, RTEMS_LOCAL, &queue_id ); |
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388 | if( status != RTEMS_SUCCESSFUL ) |
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389 | { |
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390 | printk( "UID_Queue: error open queue: %d\n", status ); |
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391 | return; |
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392 | } |
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393 | kbd_set_driver_handler( kbd_parser ); |
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394 | } |
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395 | |
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396 | |
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397 | void unregister_kbd_msg_queue( int port ) |
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398 | { |
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399 | kbd_set_driver_handler( NULL ); |
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400 | } |
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