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/*
* some generic framebuffer device stuff
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <linux/fb.h>
#include "fbtools.h"
#ifndef HAVE_STRSIGNAL
static const char *strsignal(int signr)
{
return sys_siglist[signr];
}
#endif
/* -------------------------------------------------------------------- */
/* exported stuff */
struct fb_fix_screeninfo fb_fix;
struct fb_var_screeninfo fb_var;
unsigned char *fb_mem;
int fb_mem_offset = 0;
int fb_switch_state = FB_ACTIVE;
/* -------------------------------------------------------------------- */
/* internal variables */
static int fb,tty;
#if 0
static int bpp,black,white;
#endif
static int orig_vt_no = 0;
static struct vt_mode vt_mode;
static int kd_mode;
static struct vt_mode vt_omode;
static struct termios term;
static struct fb_var_screeninfo fb_ovar;
static unsigned short ored[256], ogreen[256], oblue[256];
static struct fb_cmap ocmap = { 0, 256, ored, ogreen, oblue };
/* -------------------------------------------------------------------- */
/* devices */
struct DEVS {
char *fb0;
char *fbnr;
char *ttynr;
};
struct DEVS devs_default = {
fb0: "/dev/fb0",
fbnr: "/dev/fb%d",
ttynr: "/dev/tty%d",
};
struct DEVS devs_devfs = {
fb0: "/dev/fb/0",
fbnr: "/dev/fb/%d",
ttynr: "/dev/vc/%d",
};
struct DEVS *devices;
static void dev_init(void)
{
struct stat dummy;
if (NULL != devices)
return;
if (0 == stat("/dev/.devfsd",&dummy))
devices = &devs_devfs;
else
devices = &devs_default;
}
/* -------------------------------------------------------------------- */
/* console switching */
extern int debug;
static void
fb_switch_signal(int signal)
{
if (signal == SIGUSR1) {
/* release */
fb_switch_state = FB_REL_REQ;
if (debug)
write(2,"vt: SIGUSR1\n",12);
}
if (signal == SIGUSR2) {
/* acquisition */
fb_switch_state = FB_ACQ_REQ;
if (debug)
write(2,"vt: SIGUSR2\n",12);
}
}
void
fb_switch_release()
{
ioctl(tty, VT_RELDISP, 1);
fb_switch_state = FB_INACTIVE;
if (debug)
write(2,"vt: release\n",12);
}
void
fb_switch_acquire()
{
ioctl(tty, VT_RELDISP, VT_ACKACQ);
fb_switch_state = FB_ACTIVE;
if (debug)
write(2,"vt: acquire\n",12);
}
int
fb_switch_init()
{
struct sigaction act,old;
memset(&act,0,sizeof(act));
act.sa_handler = fb_switch_signal;
sigemptyset(&act.sa_mask);
sigaction(SIGUSR1,&act,&old);
sigaction(SIGUSR2,&act,&old);
if (-1 == ioctl(tty,VT_GETMODE, &vt_mode)) {
perror("ioctl VT_GETMODE");
exit(1);
}
vt_mode.mode = VT_PROCESS;
vt_mode.waitv = 0;
vt_mode.relsig = SIGUSR1;
vt_mode.acqsig = SIGUSR2;
if (-1 == ioctl(tty,VT_SETMODE, &vt_mode)) {
perror("ioctl VT_SETMODE");
exit(1);
}
return 0;
}
/* -------------------------------------------------------------------- */
/* initialisation & cleanup */
void
fb_memset (void *addr, int c, size_t len)
{
#if 1 /* defined(__powerpc__) */
unsigned int i, *p;
i = (c & 0xff) << 8;
i |= i << 16;
len >>= 2;
for (p = addr; len--; p++)
*p = i;
#else
memset(addr, c, len);
#endif
}
static int
fb_setmode(char *name)
{
FILE *fp;
char line[80],label[32],value[16];
int geometry=0, timings=0;
/* load current values */
if (-1 == ioctl(fb,FBIOGET_VSCREENINFO,&fb_var)) {
perror("ioctl FBIOGET_VSCREENINFO");
exit(1);
}
if (NULL == name)
return -1;
if (NULL == (fp = fopen("/etc/fb.modes","r")))
return -1;
while (NULL != fgets(line,79,fp)) {
if (1 == sscanf(line, "mode \"%31[^\"]\"",label) &&
0 == strcmp(label,name)) {
/* fill in new values */
fb_var.sync = 0;
fb_var.vmode = 0;
while (NULL != fgets(line,79,fp) &&
NULL == strstr(line,"endmode")) {
if (5 == sscanf(line," geometry %d %d %d %d %d",
&fb_var.xres,&fb_var.yres,
&fb_var.xres_virtual,&fb_var.yres_virtual,
&fb_var.bits_per_pixel))
geometry = 1;
if (7 == sscanf(line," timings %d %d %d %d %d %d %d",
&fb_var.pixclock,
&fb_var.left_margin, &fb_var.right_margin,
&fb_var.upper_margin, &fb_var.lower_margin,
&fb_var.hsync_len, &fb_var.vsync_len))
timings = 1;
if (1 == sscanf(line, " hsync %15s",value) &&
0 == strcasecmp(value,"high"))
fb_var.sync |= FB_SYNC_HOR_HIGH_ACT;
if (1 == sscanf(line, " vsync %15s",value) &&
0 == strcasecmp(value,"high"))
fb_var.sync |= FB_SYNC_VERT_HIGH_ACT;
if (1 == sscanf(line, " csync %15s",value) &&
0 == strcasecmp(value,"high"))
fb_var.sync |= FB_SYNC_COMP_HIGH_ACT;
if (1 == sscanf(line, " extsync %15s",value) &&
0 == strcasecmp(value,"true"))
fb_var.sync |= FB_SYNC_EXT;
if (1 == sscanf(line, " laced %15s",value) &&
0 == strcasecmp(value,"true"))
fb_var.vmode |= FB_VMODE_INTERLACED;
if (1 == sscanf(line, " double %15s",value) &&
0 == strcasecmp(value,"true"))
fb_var.vmode |= FB_VMODE_DOUBLE;
}
/* ok ? */
if (!geometry || !timings)
return -1;
/* set */
fb_var.xoffset = 0;
fb_var.yoffset = 0;
if (-1 == ioctl(fb,FBIOPUT_VSCREENINFO,&fb_var))
perror("ioctl FBIOPUT_VSCREENINFO");
/* look what we have now ... */
if (-1 == ioctl(fb,FBIOGET_VSCREENINFO,&fb_var)) {
perror("ioctl FBIOGET_VSCREENINFO");
exit(1);
}
return 0;
}
}
return -1;
}
static void
fb_setvt(int vtno)
{
struct vt_stat vts;
char vtname[12];
if (vtno < 0) {
if (-1 == ioctl(tty,VT_OPENQRY, &vtno) || vtno == -1) {
perror("ioctl VT_OPENQRY");
exit(1);
}
}
vtno &= 0xff;
sprintf(vtname, devices->ttynr, vtno);
chown(vtname, getuid(), getgid());
if (-1 == access(vtname, R_OK | W_OK)) {
fprintf(stderr,"access %s: %s\n",vtname,strerror(errno));
exit(1);
}
switch (fork()) {
case 0:
break;
case -1:
perror("fork");
exit(1);
default:
exit(0);
}
close(tty);
close(0);
close(1);
close(2);
setsid();
open(vtname,O_RDWR);
dup(0);
dup(0);
if (-1 == ioctl(tty,VT_GETSTATE, &vts)) {
perror("ioctl VT_GETSTATE");
exit(1);
}
orig_vt_no = vts.v_active;
if (-1 == ioctl(tty,VT_ACTIVATE, vtno)) {
perror("ioctl VT_ACTIVATE");
exit(1);
}
if (-1 == ioctl(tty,VT_WAITACTIVE, vtno)) {
perror("ioctl VT_WAITACTIVE");
exit(1);
}
}
/* Hmm. radeonfb needs this. matroxfb doesn't. */
static int fb_activate_current(int tty)
{
struct vt_stat vts;
if (-1 == ioctl(tty,VT_GETSTATE, &vts)) {
perror("ioctl VT_GETSTATE");
return -1;
}
if (-1 == ioctl(tty,VT_ACTIVATE, vts.v_active)) {
perror("ioctl VT_ACTIVATE");
return -1;
}
if (-1 == ioctl(tty,VT_WAITACTIVE, vts.v_active)) {
perror("ioctl VT_WAITACTIVE");
return -1;
}
return 0;
}
int
fb_init(char *device, char *mode, int vt)
{
char fbdev[16];
struct vt_stat vts;
unsigned long page_mask;
dev_init();
tty = 0;
if (vt != 0)
fb_setvt(vt);
if (-1 == ioctl(tty,VT_GETSTATE, &vts)) {
fprintf(stderr,"ioctl VT_GETSTATE: %s (not a linux console?)\n",
strerror(errno));
exit(1);
}
if (NULL == device) {
device = getenv("FRAMEBUFFER");
if (NULL == device) {
struct fb_con2fbmap c2m;
memset(&c2m, 0, sizeof(c2m));
if (-1 == (fb = open(devices->fb0,O_RDWR /* O_WRONLY */,0))) {
fprintf(stderr,"open %s: %s\n",devices->fb0,strerror(errno));
exit(1);
}
c2m.console = vts.v_active;
if (-1 == ioctl(fb, FBIOGET_CON2FBMAP, &c2m)) {
perror("ioctl FBIOGET_CON2FBMAP");
exit(1);
}
close(fb);
fprintf(stderr,"map: vt%02d => fb%d\n",
c2m.console, c2m.framebuffer);
sprintf(fbdev,devices->fbnr,c2m.framebuffer);
device = fbdev;
}
}
/* get current settings (which we have to restore) */
if (-1 == (fb = open(device,O_RDWR /* O_WRONLY */))) {
fprintf(stderr,"open %s: %s\n",device,strerror(errno));
exit(1);
}
if (-1 == ioctl(fb,FBIOGET_VSCREENINFO,&fb_ovar)) {
perror("ioctl FBIOGET_VSCREENINFO");
exit(1);
}
if (-1 == ioctl(fb,FBIOGET_FSCREENINFO,&fb_fix)) {
perror("ioctl FBIOGET_FSCREENINFO");
exit(1);
}
if (fb_ovar.bits_per_pixel == 8 ||
fb_fix.visual == FB_VISUAL_DIRECTCOLOR) {
if (-1 == ioctl(fb,FBIOGETCMAP,&ocmap)) {
perror("ioctl FBIOGETCMAP");
exit(1);
}
}
if (-1 == ioctl(tty,KDGETMODE, &kd_mode)) {
perror("ioctl KDGETMODE");
exit(1);
}
if (-1 == ioctl(tty,VT_GETMODE, &vt_omode)) {
perror("ioctl VT_GETMODE");
exit(1);
}
tcgetattr(tty, &term);
/* switch mode */
fb_setmode(mode);
/* checks & initialisation */
if (-1 == ioctl(fb,FBIOGET_FSCREENINFO,&fb_fix)) {
perror("ioctl FBIOGET_FSCREENINFO");
exit(1);
}
if (fb_fix.type != FB_TYPE_PACKED_PIXELS) {
fprintf(stderr,"can handle only packed pixel frame buffers\n");
goto err;
}
#if 0
switch (fb_var.bits_per_pixel) {
case 8:
white = 255; black = 0; bpp = 1;
break;
case 15:
case 16:
if (fb_var.green.length == 6)
white = 0xffff;
else
white = 0x7fff;
black = 0; bpp = 2;
break;
case 24:
white = 0xffffff; black = 0; bpp = fb_var.bits_per_pixel/8;
break;
case 32:
white = 0xffffff; black = 0; bpp = fb_var.bits_per_pixel/8;
fb_setpixels = fb_setpixels4;
break;
default:
fprintf(stderr, "Oops: %i bit/pixel ???\n",
fb_var.bits_per_pixel);
goto err;
}
#endif
page_mask = getpagesize()-1;
fb_mem_offset = (unsigned long)(fb_fix.smem_start) & page_mask;
fb_mem = mmap(NULL,fb_fix.smem_len+fb_mem_offset,
PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);
if (-1L == (long)fb_mem) {
perror("mmap");
goto err;
}
/* move viewport to upper left corner */
if (fb_var.xoffset != 0 || fb_var.yoffset != 0) {
fb_var.xoffset = 0;
fb_var.yoffset = 0;
if (-1 == ioctl(fb,FBIOPAN_DISPLAY,&fb_var)) {
perror("ioctl FBIOPAN_DISPLAY");
goto err;
}
}
if (-1 == ioctl(tty,KDSETMODE, KD_GRAPHICS)) {
perror("ioctl KDSETMODE");
goto err;
}
fb_activate_current(tty);
/* cls */
fb_memset(fb_mem+fb_mem_offset, 0, fb_fix.line_length * fb_var.yres);
return fb;
err:
fb_cleanup();
exit(1);
}
void
fb_cleanup(void)
{
/* restore console */
if (-1 == ioctl(tty,KDSETMODE, kd_mode))
perror("ioctl KDSETMODE");
if (-1 == ioctl(fb,FBIOPUT_VSCREENINFO,&fb_ovar))
perror("ioctl FBIOPUT_VSCREENINFO");
if (-1 == ioctl(fb,FBIOGET_FSCREENINFO,&fb_fix))
perror("ioctl FBIOGET_FSCREENINFO");
if (fb_ovar.bits_per_pixel == 8 ||
fb_fix.visual == FB_VISUAL_DIRECTCOLOR) {
if (-1 == ioctl(fb,FBIOPUTCMAP,&ocmap))
perror("ioctl FBIOPUTCMAP");
}
close(fb);
if (-1 == ioctl(tty,VT_SETMODE, &vt_omode))
perror("ioctl VT_SETMODE");
if (orig_vt_no && -1 == ioctl(tty, VT_ACTIVATE, orig_vt_no))
perror("ioctl VT_ACTIVATE");
if (orig_vt_no && -1 == ioctl(tty, VT_WAITACTIVE, orig_vt_no))
perror("ioctl VT_WAITACTIVE");
tcsetattr(tty, TCSANOW, &term);
close(tty);
}
/* -------------------------------------------------------------------- */
/* handle fatal errors */
static jmp_buf fb_fatal_cleanup;
static void
fb_catch_exit_signal(int signal)
{
siglongjmp(fb_fatal_cleanup,signal);
}
void
fb_catch_exit_signals(void)
{
struct sigaction act,old;
int termsig;
memset(&act,0,sizeof(act));
act.sa_handler = fb_catch_exit_signal;
sigemptyset(&act.sa_mask);
sigaction(SIGINT, &act,&old);
sigaction(SIGQUIT,&act,&old);
sigaction(SIGTERM,&act,&old);
sigaction(SIGABRT,&act,&old);
sigaction(SIGTSTP,&act,&old);
sigaction(SIGBUS, &act,&old);
sigaction(SIGILL, &act,&old);
sigaction(SIGSEGV,&act,&old);
if (0 == (termsig = sigsetjmp(fb_fatal_cleanup,0)))
return;
/* cleanup */
fb_cleanup();
fprintf(stderr,"Oops: %s\n",strsignal(termsig));
exit(42);
}
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