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/***********************************************************************
*
* (C) Copyright 2004
* DENX Software Engineering
* Wolfgang Denk, wd@denx.de
* All rights reserved.
*
* Keyboard driver
*
***********************************************************************/
#include <common.h>
#ifdef CONFIG_PS2KBD
#include <devices.h>
#include <keyboard.h>
#undef KBG_DEBUG
#ifdef KBG_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
#define DEVNAME "kbd"
#define LED_SCR 0x01 /* scroll lock led */
#define LED_CAP 0x04 /* caps lock led */
#define LED_NUM 0x02 /* num lock led */
#define KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */
static volatile char kbd_buffer[KBD_BUFFER_LEN];
static volatile int in_pointer = 0;
static volatile int out_pointer = 0;
static unsigned char leds = 0;
static unsigned char num_lock = 0;
static unsigned char caps_lock = 0;
static unsigned char scroll_lock = 0;
static unsigned char shift = 0;
static unsigned char ctrl = 0;
static unsigned char alt = 0;
static unsigned char e0 = 0;
/******************************************************************
* Queue handling
******************************************************************/
/* puts character in the queue and sets up the in and out pointer */
static void kbd_put_queue(char data)
{
if((in_pointer+1)==KBD_BUFFER_LEN) {
if(out_pointer==0) {
return; /* buffer full */
} else{
in_pointer=0;
}
} else {
if((in_pointer+1)==out_pointer)
return; /* buffer full */
in_pointer++;
}
kbd_buffer[in_pointer]=data;
return;
}
/* test if a character is in the queue */
static int kbd_testc(void)
{
if(in_pointer==out_pointer)
return(0); /* no data */
else
return(1);
}
/* gets the character from the queue */
static int kbd_getc(void)
{
char c;
while(in_pointer==out_pointer);
if((out_pointer+1)==KBD_BUFFER_LEN)
out_pointer=0;
else
out_pointer++;
c=kbd_buffer[out_pointer];
return (int)c;
}
/* Simple translation table for the keys */
static unsigned char kbd_plain_xlate[] = {
0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t', /* 0x00 - 0x0f */
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's', /* 0x10 - 0x1f */
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */
'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
static unsigned char kbd_shift_xlate[] = {
0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t', /* 0x00 - 0x0f */
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S', /* 0x10 - 0x1f */
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */
'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
static unsigned char kbd_ctrl_xlate[] = {
0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t', /* 0x00 - 0x0f */
0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13, /* 0x10 - 0x1f */
0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16, /* 0x20 - 0x2f */
0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
void handle_scancode(unsigned char scancode)
{
unsigned char keycode;
/* Convert scancode to keycode */
PRINTF("scancode %x\n",scancode);
if(scancode==0xe0) {
e0=1; /* special charakters */
return;
}
if(e0==1) {
e0=0; /* delete flag */
if(!( ((scancode&0x7F)==0x38)|| /* the right ctrl key */
((scancode&0x7F)==0x1D)|| /* the right alt key */
((scancode&0x7F)==0x35)|| /* the right '/' key */
((scancode&0x7F)==0x1C) )) /* the right enter key */
/* we swallow unknown e0 codes */
return;
}
/* special cntrl keys */
switch(scancode) {
case 0x2A:
case 0x36: /* shift pressed */
shift=1;
return; /* do nothing else */
case 0xAA:
case 0xB6: /* shift released */
shift=0;
return; /* do nothing else */
case 0x38: /* alt pressed */
alt=1;
return; /* do nothing else */
case 0xB8: /* alt released */
alt=0;
return; /* do nothing else */
case 0x1d: /* ctrl pressed */
ctrl=1;
return; /* do nothing else */
case 0x9d: /* ctrl released */
ctrl=0;
return; /* do nothing else */
case 0x46: /* scrollock pressed */
scroll_lock=~scroll_lock;
if(scroll_lock==0)
leds&=~LED_SCR; /* switch LED off */
else
leds|=LED_SCR; /* switch on LED */
pckbd_leds(leds);
return; /* do nothing else */
case 0x3A: /* capslock pressed */
caps_lock=~caps_lock;
if(caps_lock==0)
leds&=~LED_CAP; /* switch caps_lock off */
else
leds|=LED_CAP; /* switch on LED */
pckbd_leds(leds);
return;
case 0x45: /* numlock pressed */
num_lock=~num_lock;
if(num_lock==0)
leds&=~LED_NUM; /* switch LED off */
else
leds|=LED_NUM; /* switch on LED */
pckbd_leds(leds);
return;
case 0xC6: /* scroll lock released */
case 0xC5: /* num lock released */
case 0xBA: /* caps lock released */
return; /* just swallow */
}
#if 1
if((scancode&0x80)==0x80) /* key released */
return;
#else
if((scancode&0x80)==0x00) /* key pressed */
return;
scancode &= ~0x80;
#endif
/* now, decide which table we need */
if(scancode > (sizeof(kbd_plain_xlate)/sizeof(kbd_plain_xlate[0]))) { /* scancode not in list */
PRINTF("unkown scancode %X\n",scancode);
return; /* swallow it */
}
/* setup plain code first */
keycode=kbd_plain_xlate[scancode];
if(caps_lock==1) { /* caps_lock is pressed, overwrite plain code */
if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */
PRINTF("unkown caps-locked scancode %X\n",scancode);
return; /* swallow it */
}
keycode=kbd_shift_xlate[scancode];
if(keycode<'A') { /* we only want the alphas capital */
keycode=kbd_plain_xlate[scancode];
}
}
if(shift==1) { /* shift overwrites caps_lock */
if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */
PRINTF("unkown shifted scancode %X\n",scancode);
return; /* swallow it */
}
keycode=kbd_shift_xlate[scancode];
}
if(ctrl==1) { /* ctrl overwrites caps_lock and shift */
if(scancode > (sizeof(kbd_ctrl_xlate)/sizeof(kbd_ctrl_xlate[0]))) { /* scancode not in list */
PRINTF("unkown ctrl scancode %X\n",scancode);
return; /* swallow it */
}
keycode=kbd_ctrl_xlate[scancode];
}
/* check if valid keycode */
if(keycode==0xff) {
PRINTF("unkown scancode %X\n",scancode);
return; /* swallow unknown codes */
}
kbd_put_queue(keycode);
PRINTF("%x\n",keycode);
}
/******************************************************************
* Init
******************************************************************/
#ifdef CFG_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console (void);
#else
int overwrite_console (void)
{
return (0);
}
#endif
int kbd_init (void)
{
int error;
device_t kbddev ;
char *stdinname = getenv ("stdin");
if(kbd_init_hw()==-1)
return -1;
memset (&kbddev, 0, sizeof(kbddev));
strcpy(kbddev.name, DEVNAME);
kbddev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
kbddev.putc = NULL ;
kbddev.puts = NULL ;
kbddev.getc = kbd_getc ;
kbddev.tstc = kbd_testc ;
error = device_register (&kbddev);
if(error==0) {
/* check if this is the standard input device */
if(strcmp(stdinname,DEVNAME)==0) {
/* reassign the console */
if(overwrite_console()) {
return 1;
}
error=console_assign(stdin,DEVNAME);
if(error==0)
return 1;
else
return error;
}
return 1;
}
return error;
}
#endif /* CONFIG_PS2KBD */
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