gnuboy-for-dfi/sys/linux/kb.c

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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <linux/kd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/vt.h>
#include <termios.h>
#undef K_NUMLOCK
#include "defs.h"
#include "rc.h"
#include "fb.h"
#include "input.h"
#define TTY_DEVICE "/dev/tty"
static int kbfd = -1;
static int initial_kbmode;
static struct termios initial_term, term;
#define SCAN_ALT 56
#define SCAN_FBASE 58
static int alt;
static struct vt_mode vtm, initial_vtm;
extern int keymap[][2];
rcvar_t kb_exports[] =
{
RCV_END
};
static void vcrelease(int s)
{
signal(s, vcrelease);
ioctl(kbfd, VT_RELDISP, VT_ACKACQ);
}
static void vcacquire(int s)
{
signal(s, vcacquire);
ioctl(kbfd, VT_RELDISP, VT_ACKACQ);
fb.enabled = 1;
}
void kb_init()
{
kbfd = open(TTY_DEVICE, O_RDWR);
if (!kbfd) die("no controlling terminal\n");
fcntl(kbfd, F_SETFL, O_NONBLOCK);
if (ioctl(kbfd, KDSETMODE, KD_GRAPHICS) < 0)
die("controlling terminal is not the graphics console\n");
ioctl(kbfd, KDGKBMODE, &initial_kbmode);
tcgetattr(kbfd, &initial_term);
term = initial_term;
term.c_lflag &= ~(ICANON | ECHO | ISIG);
term.c_iflag &= ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 0;
tcsetattr(kbfd, TCSAFLUSH, &term);
ioctl(kbfd, KDSKBMODE, K_MEDIUMRAW);
ioctl(kbfd, VT_GETMODE, &initial_vtm);
signal(SIGUSR1, vcrelease);
signal(SIGUSR2, vcacquire);
vtm = initial_vtm;
vtm.mode = VT_PROCESS;
vtm.relsig = SIGUSR1;
vtm.acqsig = SIGUSR2;
ioctl(kbfd, VT_SETMODE, &vtm);
}
void kb_close()
{
ioctl(kbfd, VT_SETMODE, &initial_vtm);
ioctl(kbfd, KDSKBMODE, initial_kbmode);
tcsetattr(kbfd, TCSAFLUSH, &initial_term);
ioctl(kbfd, KDSETMODE, KD_TEXT);
}
static void vcswitch(int c)
{
struct vt_stat vts;
ioctl(kbfd, VT_GETSTATE, &vts);
if (c != vts.v_active)
{
ioctl(kbfd, VT_ACTIVATE, c);
fb.enabled = 0;
fb.dirty = 1;
}
}
void kb_poll()
{
int i;
event_t ev;
byte k;
int st;
while (read(kbfd, &k, 1) > 0)
{
st = !(k & 0x80);
k &= 0x7f;
if (k == SCAN_ALT) alt = st;
if (alt && k > SCAN_FBASE && k < SCAN_FBASE + 10)
vcswitch(k - SCAN_FBASE);
ev.type = st ? EV_PRESS : EV_RELEASE;
for (i = 0; keymap[i][0]; i++)
if (keymap[i][0] == k)
break;
if (!keymap[i][0]) continue;
ev.code = keymap[i][1];
ev_postevent(&ev);
}
}