drivers/input/keyboard.c

   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 <devices.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 CFG_CONSOLE_OVERWRITE_ROUTINE
 262 extern int overwrite_console (void);
 263 #define OVERWRITE_CONSOLE overwrite_console ()
 264 #else
 265 #define OVERWRITE_CONSOLE 0
 266 #endif /* CFG_CONSOLE_OVERWRITE_ROUTINE */
 267
 268 int kbd_init (void)
 269 {
 270         int error;
 271         device_t 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 = device_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 }