aiie/linuxfb/linux-keyboard.cpp

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#include "linux-keyboard.h"
#include <unistd.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <linux/input.h>
#include <dirent.h>
#include "sdl-paddles.h"
#include "globals.h"
#include "physicalkeyboard.h"
LinuxKeyboard::LinuxKeyboard(VMKeyboard *k) : PhysicalKeyboard(k)
{
// We want the first USB keyboard that we find. This object reads
// events directly from it, rather than using standard I/O.
// So we're looking for something matching this pattern:
// /dev/input/by-path/platform-20980000.usb-usb-*-event-kbd
DIR *dirp = opendir("/dev/input/by-path");
if (!dirp)
return; // No USB devices? :/
struct dirent *dp;
while ((dp = readdir(dirp)) != NULL) {
if (!strcmp(&dp->d_name[strlen(dp->d_name)-4], "-kbd")) {
char buf[MAXPATH];
sprintf(buf, "/dev/input/by-path/%s", dp->d_name);
fd = open(buf, O_RDONLY | O_NONBLOCK);
printf("Opened keyboard %s\n", buf);
break;
}
}
}
LinuxKeyboard::~LinuxKeyboard()
{
close(fd);
}
// FIXME: dummy value
#define BIOSKEY 254
static uint8_t keymap[] = {
0, // keycode 0 doesn't exist
PK_ESC,
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'0',
'-',
'=',
PK_DEL,
PK_TAB,
'q',
'w',
'e',
'r',
't',
'y',
'u',
'i',
'o',
'p',
'[',
']',
13,
PK_CTRL,
'a',
's',
'd',
'f',
'g',
'h',
'j',
'k',
'l',
';',
'\'',
'`',
PK_LSHFT,
'\\',
'z',
'x',
'c',
'v',
'b',
'n',
'm',
',',
'.',
'/',
PK_RSHFT,
'*',
PK_LA,
' ',
PK_LOCK,
0, // F1,
0, // F2,
0, // F3,
0, // F4,
0, // F5,
0, // F6,
0, // F7,
0, // F8,
0, // F9,
0, // F10,
0, // numlock
0, // scrolllock
0, // HOME7
0, // UP8
0, // PGUP 9
0,
0, // LEFT4
'5', // number pad 5?
0, // RTARROW6
'+',
0, // END1
0, // DOWN2
0, // PGDN3
0, // INS
0, // DEL
0,
0,
0,
0, // F11
BIOSKEY, // F12
0,
0,
0,
0,
0,
0,
0,
PK_RET, // number pad enter?
PK_CTRL, // Right control?
'/',
0, // prtscr
PK_RA,
0,
0, // HOME
PK_UARR,
0, // PGUP
PK_LARR,
PK_RARR,
0, // END
PK_DARR,
0, // PGDN
0, // INSERT
PK_DEL,
0,
0,
0,
0,
0,
0,
0,
0 // PAUSE
};
static uint8_t mapkeycode(uint16_t v)
{
if (v < sizeof(keymap))
return keymap[v];
else
return 0;
}
void LinuxKeyboard::maintainKeyboard()
{
struct input_event ev;
ssize_t n;
n = ::read(fd, &ev, sizeof ev);
if (n == sizeof(ev)) {
if (ev.type == EV_KEY && ev.value >= 0 && ev.value <= 2) {
uint8_t code = mapkeycode(ev.code);
if (code == BIOSKEY) {
g_biosInterrupt = true;
return;
}
if (code) {
switch (ev.value) {
case 0: // release
vmkeyboard->keyReleased(code);
break;
case 1: // press
vmkeyboard->keyDepressed(code);
break;
case 2: // autorepeat
break;
}
}
}
}
}
bool keyHitPending = false;
uint8_t keyPending;
bool LinuxKeyboard::kbhit()
{
struct input_event ev;
ssize_t n;
n = ::read(fd, &ev, sizeof ev);
if (n == sizeof(ev)) {
if (ev.type == EV_KEY && ev.value == 1) {
uint8_t code = mapkeycode(ev.code);
if (code && code != BIOSKEY) {
keyHitPending = true;
keyPending = code;
}
}
}
return keyHitPending;
}
int8_t LinuxKeyboard::read()
{
if (keyHitPending) {
keyHitPending = false;
return keyPending;
}
return 0;
}