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/* uuterm, Copyright (C) 2006 Rich Felker; licensed under GNU GPL v2 only */
#include <unistd.h>
#include <fcntl.h>
#include <sys/select.h>
#include <signal.h>
#include <termios.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/vt.h>
#include <sys/kd.h>
#include <linux/fb.h>
#include "uuterm.h"
#include "dblbuf.h"
struct priv
{
/* common to all double buffered fb targets */
struct dblbuf b;
/* fbcon-specific */
int fb;
int kb;
int ms;
struct termios tio;
int xres, yres;
void *buf_mem;
};
static int get_fb_size(struct uudisp *d)
{
struct priv *p = (struct priv *)&d->priv;
struct fb_fix_screeninfo fix;
struct fb_var_screeninfo var;
if (ioctl(p->fb, FBIOGET_FSCREENINFO, &fix) < 0
|| ioctl(p->fb, FBIOGET_VSCREENINFO, &var) < 0
|| fix.type != FB_TYPE_PACKED_PIXELS)
return -1;
p->b.bytes_per_pixel = (var.bits_per_pixel+7)>>3;
p->b.line_stride = fix.line_length;
p->b.row_stride = fix.line_length * d->cell_h;
if (var.xres != p->xres || var.yres != p->yres) {
int w = var.xres / d->cell_w;
int h = var.yres / d->cell_h;
void *buf = uuterm_alloc(SLICE_BUF_SIZE(w, h, (d->cell_w+7)/8, d->cell_h));
if (!buf) return -1;
if (p->buf_mem) uuterm_free(p->buf_mem);
p->buf_mem = buf;
p->b.slices = dblbuf_setup_buf(w, h, (d->cell_w+7)/8, d->cell_h, buf);
p->xres = var.xres;
p->yres = var.yres;
d->w = w;
d->h = h;
p->b.repaint = 1;
p->b.curs_x = p->b.curs_y = 0;
}
return 0;
}
static struct uudisp *display;
static void fatalsignal(int sig)
{
uudisp_close(display);
signal(sig, SIG_DFL);
raise(sig);
}
static void dummy(int x)
{
}
static void vtswitch(int sig)
{
struct priv *p = (void *)&display->priv;
p->b.repaint = p->b.active = sig == SIGUSR2;
ioctl(p->kb, VT_RELDISP, VT_ACKACQ);
signal(sig, vtswitch);
}
int uudisp_open(struct uudisp *d)
{
struct priv *p = (void *)&d->priv;
struct fb_fix_screeninfo fix;
struct termios tio;
struct vt_mode vtm;
p->fb = p->kb = p->ms = -1;
p->b.vidmem = MAP_FAILED;
if ((p->fb = open("/dev/fb0", O_RDWR)) < 0 || get_fb_size(d) < 0
|| ioctl(p->fb, FBIOGET_FSCREENINFO, &fix) < 0)
goto error;
p->b.vidmem = mmap(0, fix.smem_len, PROT_WRITE|PROT_READ, MAP_SHARED, p->fb, 0);
if (p->b.vidmem == MAP_FAILED)
goto error;
display = d;
signal(SIGINT, fatalsignal);
signal(SIGTERM, fatalsignal);
signal(SIGSEGV, fatalsignal);
signal(SIGBUS, fatalsignal);
signal(SIGABRT, fatalsignal);
signal(SIGFPE, fatalsignal);
signal(SIGUSR1, vtswitch);
signal(SIGUSR2, vtswitch);
if ((p->kb = open("/dev/tty", O_RDONLY)) < 0
|| ioctl(p->kb, KDSETMODE, KD_GRAPHICS) < 0)
goto error;
/* If the above succeeds, the below cannot fail */
tcgetattr(p->kb, &p->tio);
tio = p->tio;
tio.c_cflag = B38400 | CS8 | CLOCAL | CREAD;
tio.c_iflag = 0;
tio.c_oflag = 0;
tio.c_lflag = 0;
tcsetattr(p->kb, TCSANOW, &tio);
vtm.mode = VT_PROCESS;
vtm.waitv = 0;
vtm.relsig = SIGUSR1;
vtm.acqsig = SIGUSR2;
vtm.frsig = 0;
ioctl(p->kb, VT_SETMODE, &vtm);
signal(SIGWINCH, dummy); /* just to interrupt select! */
signal(SIGTSTP, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
/* FIXME: need to actually detect if the VC is active */
p->b.active = 1;
return 0;
error:
if (p->b.vidmem != MAP_FAILED) munmap(p->b.vidmem, fix.smem_len);
close(p->fb);
close(p->kb);
close(p->ms);
return -1;
}
int uudisp_fd_set(struct uudisp *d, int tty, void *fds)
{
struct priv *p = (struct priv *)&d->priv;
if (p->ms >= 0) FD_SET(p->ms, (fd_set *)fds);
FD_SET(p->kb, (fd_set *)fds);
return p->kb > tty ? p->kb+1 : tty+1;
}
void uudisp_next_event(struct uudisp *d, void *fds)
{
struct priv *p = (struct priv *)&d->priv;
unsigned char b;
get_fb_size(d);
d->inlen = 0;
d->intext = d->inbuf;
if (FD_ISSET(p->kb, (fd_set *)fds)) {
d->inlen = read(p->kb, d->inbuf, sizeof d->inbuf);
if (d->inlen < 0) d->inlen = 0;
}
}
void uudisp_close(struct uudisp *d)
{
struct priv *p = (struct priv *)&d->priv;
struct vt_mode vtm;
tcsetattr(p->kb, TCSANOW, &p->tio);
ioctl(p->kb, KDSETMODE, KD_TEXT);
vtm.mode = VT_AUTO;
vtm.waitv = 0;
ioctl(p->kb, VT_SETMODE, &vtm);
close(p->fb);
close(p->kb);
close(p->ms);
}
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