299 lines
8.7 KiB
C
299 lines
8.7 KiB
C
/***********************************************************************
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*
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* (C) Copyright 2004
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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*
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* Keyboard driver
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*
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***********************************************************************/
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#include <common.h>
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#include <stdio_dev.h>
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#include <keyboard.h>
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#undef KBG_DEBUG
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#ifdef KBG_DEBUG
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#define PRINTF(fmt,args...) printf (fmt ,##args)
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#else
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#define PRINTF(fmt,args...)
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#endif
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#define DEVNAME "kbd"
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#define LED_SCR 0x01 /* scroll lock led */
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#define LED_CAP 0x04 /* caps lock led */
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#define LED_NUM 0x02 /* num lock led */
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#define KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */
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#if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
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int ps2ser_check(void);
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#endif
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static volatile char kbd_buffer[KBD_BUFFER_LEN];
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static volatile int in_pointer = 0;
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static volatile int out_pointer = 0;
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static unsigned char leds = 0;
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static unsigned char num_lock = 0;
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static unsigned char caps_lock = 0;
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static unsigned char scroll_lock = 0;
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static unsigned char shift = 0;
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static unsigned char ctrl = 0;
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static unsigned char alt = 0;
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static unsigned char e0 = 0;
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/******************************************************************
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* Queue handling
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******************************************************************/
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/* puts character in the queue and sets up the in and out pointer */
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static void kbd_put_queue(char data)
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{
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if((in_pointer+1)==KBD_BUFFER_LEN) {
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if(out_pointer==0) {
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return; /* buffer full */
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} else{
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in_pointer=0;
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}
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} else {
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if((in_pointer+1)==out_pointer)
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return; /* buffer full */
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in_pointer++;
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}
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kbd_buffer[in_pointer]=data;
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return;
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}
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/* test if a character is in the queue */
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static int kbd_testc(struct stdio_dev *dev)
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{
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#if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
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/* no ISR is used, so received chars must be polled */
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ps2ser_check();
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#endif
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if(in_pointer==out_pointer)
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return(0); /* no data */
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else
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return(1);
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}
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/* gets the character from the queue */
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static int kbd_getc(struct stdio_dev *dev)
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{
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char c;
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while(in_pointer==out_pointer) {
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#if defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
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/* no ISR is used, so received chars must be polled */
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ps2ser_check();
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#endif
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;}
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if((out_pointer+1)==KBD_BUFFER_LEN)
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out_pointer=0;
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else
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out_pointer++;
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c=kbd_buffer[out_pointer];
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return (int)c;
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}
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/* Simple translation table for the keys */
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static unsigned char kbd_plain_xlate[] = {
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0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t', /* 0x00 - 0x0f */
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'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's', /* 0x10 - 0x1f */
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'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */
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'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
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0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
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'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
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'\r',0xff,0xff
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};
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static unsigned char kbd_shift_xlate[] = {
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0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t', /* 0x00 - 0x0f */
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'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S', /* 0x10 - 0x1f */
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'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */
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'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
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0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
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'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
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'\r',0xff,0xff
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};
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static unsigned char kbd_ctrl_xlate[] = {
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0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t', /* 0x00 - 0x0f */
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0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13, /* 0x10 - 0x1f */
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0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16, /* 0x20 - 0x2f */
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0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
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0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
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'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
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'\r',0xff,0xff
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};
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void handle_scancode(unsigned char scancode)
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{
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unsigned char keycode;
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/* Convert scancode to keycode */
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PRINTF("scancode %x\n",scancode);
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if(scancode==0xe0) {
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e0=1; /* special charakters */
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return;
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}
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if(e0==1) {
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e0=0; /* delete flag */
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if(!( ((scancode&0x7F)==0x38)|| /* the right ctrl key */
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((scancode&0x7F)==0x1D)|| /* the right alt key */
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((scancode&0x7F)==0x35)|| /* the right '/' key */
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((scancode&0x7F)==0x1C) )) /* the right enter key */
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/* we swallow unknown e0 codes */
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return;
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}
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/* special cntrl keys */
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switch(scancode) {
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case 0x2A:
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case 0x36: /* shift pressed */
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shift=1;
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return; /* do nothing else */
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case 0xAA:
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case 0xB6: /* shift released */
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shift=0;
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return; /* do nothing else */
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case 0x38: /* alt pressed */
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alt=1;
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return; /* do nothing else */
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case 0xB8: /* alt released */
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alt=0;
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return; /* do nothing else */
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case 0x1d: /* ctrl pressed */
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ctrl=1;
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return; /* do nothing else */
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case 0x9d: /* ctrl released */
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ctrl=0;
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return; /* do nothing else */
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case 0x46: /* scrollock pressed */
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scroll_lock=~scroll_lock;
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if(scroll_lock==0)
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leds&=~LED_SCR; /* switch LED off */
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else
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leds|=LED_SCR; /* switch on LED */
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pckbd_leds(leds);
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return; /* do nothing else */
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case 0x3A: /* capslock pressed */
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caps_lock=~caps_lock;
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if(caps_lock==0)
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leds&=~LED_CAP; /* switch caps_lock off */
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else
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leds|=LED_CAP; /* switch on LED */
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pckbd_leds(leds);
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return;
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case 0x45: /* numlock pressed */
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num_lock=~num_lock;
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if(num_lock==0)
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leds&=~LED_NUM; /* switch LED off */
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else
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leds|=LED_NUM; /* switch on LED */
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pckbd_leds(leds);
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return;
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case 0xC6: /* scroll lock released */
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case 0xC5: /* num lock released */
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case 0xBA: /* caps lock released */
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return; /* just swallow */
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}
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#if 1
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if((scancode&0x80)==0x80) /* key released */
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return;
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#else
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if((scancode&0x80)==0x00) /* key pressed */
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return;
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scancode &= ~0x80;
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#endif
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/* now, decide which table we need */
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if(scancode > (sizeof(kbd_plain_xlate)/sizeof(kbd_plain_xlate[0]))) { /* scancode not in list */
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PRINTF("unkown scancode %X\n",scancode);
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return; /* swallow it */
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}
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/* setup plain code first */
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keycode=kbd_plain_xlate[scancode];
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if(caps_lock==1) { /* caps_lock is pressed, overwrite plain code */
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if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */
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PRINTF("unkown caps-locked scancode %X\n",scancode);
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return; /* swallow it */
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}
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keycode=kbd_shift_xlate[scancode];
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if(keycode<'A') { /* we only want the alphas capital */
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keycode=kbd_plain_xlate[scancode];
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}
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}
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if(shift==1) { /* shift overwrites caps_lock */
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if(scancode > (sizeof(kbd_shift_xlate)/sizeof(kbd_shift_xlate[0]))) { /* scancode not in list */
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PRINTF("unkown shifted scancode %X\n",scancode);
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return; /* swallow it */
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}
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keycode=kbd_shift_xlate[scancode];
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}
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if(ctrl==1) { /* ctrl overwrites caps_lock and shift */
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if(scancode > (sizeof(kbd_ctrl_xlate)/sizeof(kbd_ctrl_xlate[0]))) { /* scancode not in list */
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PRINTF("unkown ctrl scancode %X\n",scancode);
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return; /* swallow it */
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}
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keycode=kbd_ctrl_xlate[scancode];
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}
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/* check if valid keycode */
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if(keycode==0xff) {
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PRINTF("unkown scancode %X\n",scancode);
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return; /* swallow unknown codes */
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}
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kbd_put_queue(keycode);
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PRINTF("%x\n",keycode);
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}
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/******************************************************************
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* Init
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******************************************************************/
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#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
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extern int overwrite_console (void);
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#define OVERWRITE_CONSOLE overwrite_console ()
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#else
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#define OVERWRITE_CONSOLE 0
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#endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
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int kbd_init (void)
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{
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int error;
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struct stdio_dev kbddev ;
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char *stdinname = getenv ("stdin");
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if(kbd_init_hw()==-1)
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return -1;
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memset (&kbddev, 0, sizeof(kbddev));
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strcpy(kbddev.name, DEVNAME);
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kbddev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
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kbddev.getc = kbd_getc ;
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kbddev.tstc = kbd_testc ;
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error = stdio_register (&kbddev);
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if(error==0) {
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/* check if this is the standard input device */
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if(strcmp(stdinname,DEVNAME)==0) {
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/* reassign the console */
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if(OVERWRITE_CONSOLE) {
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return 1;
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}
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error=console_assign(stdin,DEVNAME);
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if(error==0)
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return 1;
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else
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return error;
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}
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return 1;
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}
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return error;
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}
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