1 /*********************************************************************** 2 * 3 * (C) Copyright 2004 4 * DENX Software Engineering 5 * Wolfgang Denk, wd@denx.de 6 * All rights reserved. 7 * 8 * Keyboard driver 9 * 10 ***********************************************************************/ 11 12 #include <common.h> 13 14 #include <stdio_dev.h> 15 #include <keyboard.h> 16 17 #undef KBG_DEBUG 18 19 #ifdef KBG_DEBUG 20 #define PRINTF(fmt,args...) printf (fmt ,##args) 21 #else 22 #define PRINTF(fmt,args...) 23 #endif 24 25 26 #define DEVNAME "kbd" 27 28 #define LED_SCR 0x01 /* scroll lock led */ 29 #define LED_CAP 0x04 /* caps lock led */ 30 #define LED_NUM 0x02 /* num lock led */ 31 32 #define KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */ 33 34 #if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555) 35 int ps2ser_check(void); 36 #endif 37 38 static volatile char kbd_buffer[KBD_BUFFER_LEN]; 39 static volatile int in_pointer = 0; 40 static volatile int out_pointer = 0; 41 42 static unsigned char leds = 0; 43 static unsigned char num_lock = 0; 44 static unsigned char caps_lock = 0; 45 static unsigned char scroll_lock = 0; 46 static unsigned char shift = 0; 47 static unsigned char ctrl = 0; 48 static unsigned char alt = 0; 49 static unsigned char e0 = 0; 50 51 /****************************************************************** 52 * Queue handling 53 ******************************************************************/ 54 55 /* puts character in the queue and sets up the in and out pointer */ 56 static void kbd_put_queue(char data) 57 { 58 if((in_pointer+1)==KBD_BUFFER_LEN) { 59 if(out_pointer==0) { 60 return; /* buffer full */ 61 } else{ 62 in_pointer=0; 63 } 64 } else { 65 if((in_pointer+1)==out_pointer) 66 return; /* buffer full */ 67 in_pointer++; 68 } 69 kbd_buffer[in_pointer]=data; 70 return; 71 } 72 73 /* test if a character is in the queue */ 74 static int kbd_testc(void) 75 { 76 #if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555) 77 /* no ISR is used, so received chars must be polled */ 78 ps2ser_check(); 79 #endif 80 if(in_pointer==out_pointer) 81 return(0); /* no data */ 82 else 83 return(1); 84 } 85 86 /* gets the character from the queue */ 87 static int kbd_getc(void) 88 { 89 char c; 90 while(in_pointer==out_pointer) { 91 #if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555) 92 /* no ISR is used, so received chars must be polled */ 93 ps2ser_check(); 94 #endif 95 ;} 96 if((out_pointer+1)==KBD_BUFFER_LEN) 97 out_pointer=0; 98 else 99 out_pointer++; 100 c=kbd_buffer[out_pointer]; 101 return (int)c; 102 103 } 104 105 /* Simple translation table for the keys */ 106 107 static unsigned char kbd_plain_xlate[] = { 108 0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t', /* 0x00 - 0x0f */ 109 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's', /* 0x10 - 0x1f */ 110 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */ 111 'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */ 112 0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ 113 '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */ 114 '\r',0xff,0xff 115 }; 116 117 static unsigned char kbd_shift_xlate[] = { 118 0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t', /* 0x00 - 0x0f */ 119 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S', /* 0x10 - 0x1f */ 120 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */ 121 'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */ 122 0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ 123 '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */ 124 '\r',0xff,0xff 125 }; 126 127 static unsigned char kbd_ctrl_xlate[] = { 128 0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t', /* 0x00 - 0x0f */ 129 0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13, /* 0x10 - 0x1f */ 130 0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16, /* 0x20 - 0x2f */ 131 0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */ 132 0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */ 133 '2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */ 134 '\r',0xff,0xff 135 }; 136 137 138 void handle_scancode(unsigned char scancode) 139 { 140 unsigned char keycode; 141 142 /* Convert scancode to keycode */ 143 PRINTF("scancode %x\n",scancode); 144 if(scancode==0xe0) { 145 e0=1; /* special charakters */ 146 return; 147 } 148 if(e0==1) { 149 e0=0; /* delete flag */ 150 if(!( ((scancode&0x7F)==0x38)|| /* the right ctrl key */ 151 ((scancode&0x7F)==0x1D)|| /* the right alt key */ 152 ((scancode&0x7F)==0x35)|| /* the right '/' key */ 153 ((scancode&0x7F)==0x1C) )) /* the right enter key */ 154 /* we swallow unknown e0 codes */ 155 return; 156 } 157 /* special cntrl keys */ 158 switch(scancode) { 159 case 0x2A: 160 case 0x36: /* shift pressed */ 161 shift=1; 162 return; /* do nothing else */ 163 case 0xAA: 164 case 0xB6: /* shift released */ 165 shift=0; 166 return; /* do nothing else */ 167 case 0x38: /* alt pressed */ 168 alt=1; 169 return; /* do nothing else */ 170 case 0xB8: /* alt released */ 171 alt=0; 172 return; /* do nothing else */ 173 case 0x1d: /* ctrl pressed */ 174 ctrl=1; 175 return; /* do nothing else */ 176 case 0x9d: /* ctrl released */ 177 ctrl=0; 178 return; /* do nothing else */ 179 case 0x46: /* scrollock pressed */ 180 scroll_lock=~scroll_lock; 181 if(scroll_lock==0) 182 leds&=~LED_SCR; /* switch LED off */ 183 else 184 leds|=LED_SCR; /* switch on LED */ 185 pckbd_leds(leds); 186 return; /* do nothing else */ 187 case 0x3A: /* capslock pressed */ 188 caps_lock=~caps_lock; 189 if(caps_lock==0) 190 leds&=~LED_CAP; /* switch caps_lock off */ 191 else 192 leds|=LED_CAP; /* switch on LED */ 193 pckbd_leds(leds); 194 return; 195 case 0x45: /* numlock pressed */ 196 num_lock=~num_lock; 197 if(num_lock==0) 198 leds&=~LED_NUM; /* switch LED off */ 199 else 200 leds|=LED_NUM; /* switch on LED */ 201 pckbd_leds(leds); 202 return; 203 case 0xC6: /* scroll lock released */ 204 case 0xC5: /* num lock released */ 205 case 0xBA: /* caps lock released */ 206 return; /* just swallow */ 207 } 208 #if 1 209 if((scancode&0x80)==0x80) /* key released */ 210 return; 211 #else 212 if((scancode&0x80)==0x00) /* key pressed */ 213 return; 214 scancode &= ~0x80; 215 #endif 216 /* now, decide which table we need */ 217 if(scancode > (sizeof(kbd_plain_xlate)/sizeof(kbd_plain_xlate[0]))) { /* scancode not in list */ 218 PRINTF("unkown scancode %X\n",scancode); 219 return; /* swallow it */ 220 } 221 /* setup plain code first */ 222 keycode=kbd_plain_xlate[scancode]; 223 if(caps_lock==1) { /* caps_lock is pressed, overwrite plain code */ 224 if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */ 225 PRINTF("unkown caps-locked scancode %X\n",scancode); 226 return; /* swallow it */ 227 } 228 keycode=kbd_shift_xlate[scancode]; 229 if(keycode<'A') { /* we only want the alphas capital */ 230 keycode=kbd_plain_xlate[scancode]; 231 } 232 } 233 if(shift==1) { /* shift overwrites caps_lock */ 234 if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */ 235 PRINTF("unkown shifted scancode %X\n",scancode); 236 return; /* swallow it */ 237 } 238 keycode=kbd_shift_xlate[scancode]; 239 } 240 if(ctrl==1) { /* ctrl overwrites caps_lock and shift */ 241 if(scancode > (sizeof(kbd_ctrl_xlate)/sizeof(kbd_ctrl_xlate[0]))) { /* scancode not in list */ 242 PRINTF("unkown ctrl scancode %X\n",scancode); 243 return; /* swallow it */ 244 } 245 keycode=kbd_ctrl_xlate[scancode]; 246 } 247 /* check if valid keycode */ 248 if(keycode==0xff) { 249 PRINTF("unkown scancode %X\n",scancode); 250 return; /* swallow unknown codes */ 251 } 252 253 kbd_put_queue(keycode); 254 PRINTF("%x\n",keycode); 255 } 256 257 /****************************************************************** 258 * Init 259 ******************************************************************/ 260 261 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE 262 extern int overwrite_console (void); 263 #define OVERWRITE_CONSOLE overwrite_console () 264 #else 265 #define OVERWRITE_CONSOLE 0 266 #endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */ 267 268 int kbd_init (void) 269 { 270 int error; 271 struct stdio_dev kbddev ; 272 char *stdinname = getenv ("stdin"); 273 274 if(kbd_init_hw()==-1) 275 return -1; 276 memset (&kbddev, 0, sizeof(kbddev)); 277 strcpy(kbddev.name, DEVNAME); 278 kbddev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; 279 kbddev.putc = NULL ; 280 kbddev.puts = NULL ; 281 kbddev.getc = kbd_getc ; 282 kbddev.tstc = kbd_testc ; 283 284 error = stdio_register (&kbddev); 285 if(error==0) { 286 /* check if this is the standard input device */ 287 if(strcmp(stdinname,DEVNAME)==0) { 288 /* reassign the console */ 289 if(OVERWRITE_CONSOLE) { 290 return 1; 291 } 292 error=console_assign(stdin,DEVNAME); 293 if(error==0) 294 return 1; 295 else 296 return error; 297 } 298 return 1; 299 } 300 return error; 301 } 302