busybox/fbset.c

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/*
* Mini fbset implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This is a from-scratch implementation of fbset; but the de facto fbset
* implementation was a good reference. fbset (original) is released under
* the GPL, and is (c) 1995-1999 by:
* Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
*/
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <linux/version.h>
#define PERROR(ctx) do { perror(ctx); exit(1); } while(0)
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#endif
#define DEFAULTFBDEV "/dev/fb0"
#define DEFAULTFBMODE "/etc/fb.modes"
#define OPT_CHANGE 1
#define OPT_INFO (1 << 1)
#define OPT_READMODE (1 << 2)
#define CMD_HELP 0
#define CMD_FB 1
#define CMD_DB 2
#define CMD_GEOMETRY 3
#define CMD_TIMING 4
#define CMD_ACCEL 5
#define CMD_HSYNC 6
#define CMD_VSYNC 7
#define CMD_LACED 8
#define CMD_DOUBLE 9
/* #define CMD_XCOMPAT 10 */
#define CMD_ALL 11
#define CMD_INFO 12
#ifdef BB_FBSET_FANCY
#define CMD_XRES 13
#define CMD_YRES 14
#define CMD_VXRES 15
#define CMD_VYRES 16
#define CMD_DEPTH 17
#define CMD_MATCH 18
#define CMD_PIXCLOCK 19
#define CMD_LEFT 20
#define CMD_RIGHT 21
#define CMD_UPPER 22
#define CMD_LOWER 23
#define CMD_HSLEN 24
#define CMD_VSLEN 25
#define CMD_CSYNC 26
#define CMD_GSYNC 27
#define CMD_EXTSYNC 28
#define CMD_BCAST 29
#define CMD_RGBA 30
#define CMD_STEP 31
#define CMD_MOVE 32
#endif
static unsigned int g_options = 0;
struct cmdoptions_t {
char *name;
unsigned char param_count;
unsigned char code;
} g_cmdoptions[] = {
{ "-h", 0, CMD_HELP },
{ "-fb", 1, CMD_FB },
{ "-db", 1, CMD_DB },
{ "-a", 0, CMD_ALL },
{ "-i", 0, CMD_INFO },
{ "-g", 5, CMD_GEOMETRY },
{ "-t", 7, CMD_TIMING },
{ "-accel", 1, CMD_ACCEL },
{ "-hsync", 1, CMD_HSYNC },
{ "-vsync", 1, CMD_VSYNC },
{ "-laced", 1, CMD_LACED },
{ "-double", 1, CMD_DOUBLE },
#ifdef BB_FBSET_FANCY
{ "--help", 0, CMD_HELP },
{ "-all", 0, CMD_ALL },
{ "-xres", 1, CMD_XRES },
{ "-yres", 1, CMD_YRES },
{ "-vxres", 1, CMD_VXRES },
{ "-vyres", 1, CMD_VYRES },
{ "-depth", 1, CMD_DEPTH },
{ "-match", 0, CMD_MATCH },
{ "--geometry", 5, CMD_GEOMETRY },
{ "-pixclock", 1, CMD_PIXCLOCK },
{ "-left", 1, CMD_LEFT },
{ "-right", 1, CMD_RIGHT },
{ "-upper", 1, CMD_UPPER },
{ "-lower", 1, CMD_LOWER },
{ "-hslen", 1, CMD_HSLEN },
{ "-vslen", 1, CMD_VSLEN },
{ "--timings", 7, CMD_TIMING },
{ "-csync", 1, CMD_CSYNC },
{ "-gsync", 1, CMD_GSYNC },
{ "-extsync", 1, CMD_EXTSYNC },
{ "-bcast", 1, CMD_BCAST },
{ "-rgba", 1, CMD_RGBA },
{ "-step", 1, CMD_STEP },
{ "-move", 1, CMD_MOVE },
#endif
{ 0, 0, 0 }
};
static int readmode(struct fb_var_screeninfo *base, const char *fn,
const char *mode)
{
#ifdef BB_FBSET_READMODE
FILE *f;
char buf[256];
char *p = buf;
if ((f = fopen(fn, "r")) == NULL) PERROR("readmode(fopen)");
while (!feof(f)) {
fgets(buf, sizeof(buf), f);
if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
p += 5;
if ((p = strstr(buf, mode))) {
p += strlen(mode);
if (!isspace(*p) && (*p != 0) && (*p != '"') && (*p != '\r')
&& (*p != '\n')) continue; /* almost, but not quite */
while (!feof(f)) {
fgets(buf, sizeof(buf), f);
if (!strstr(buf, "endmode")) return 1;
}
}
}
}
#else
fprintf(stderr, "W: mode reading was disabled on this copy of fbset; ignoring request\n");
#endif
return 0;
}
static void setmode(struct fb_var_screeninfo *base,
struct fb_var_screeninfo *set)
{
if ((int)set->xres > 0) base->xres = set->xres;
if ((int)set->yres > 0) base->yres = set->yres;
if ((int)set->xres_virtual > 0) base->xres_virtual = set->xres_virtual;
if ((int)set->yres_virtual > 0) base->yres_virtual = set->yres_virtual;
if ((int)set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
}
static void showmode(struct fb_var_screeninfo *v)
{
double drate = 0, hrate = 0, vrate = 0;
if (v->pixclock) {
drate = 1e12 / v->pixclock;
hrate = drate / (v->left_margin+v->xres+v->right_margin+v->hsync_len);
vrate = hrate / (v->upper_margin+v->yres+v->lower_margin+v->vsync_len);
}
printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int)(vrate+0.5));
#ifdef BB_FBSET_FANCY
printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate/1e6, hrate/1e3,
vrate);
#endif
printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
v->vsync_len);
printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
#else
printf("\ttimings %lu %lu %lu %lu %lu %lu %lu\n", v->pixclock, v->left_margin,
v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
v->vsync_len);
#endif
printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length, v->red.offset,
v->green.length, v->green.offset, v->blue.length, v->blue.offset,
v->transp.length, v->transp.offset);
printf("endmode\n");
}
static void fbset_usage(void)
{
int i;
#ifndef STANDALONE
fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n", BB_VER, BB_BT);
#endif
fprintf(stderr, "Usage: fbset [options] [mode]\n");
fprintf(stderr, "\tThe following options are recognized:\n");
for (i = 0; g_cmdoptions[i].name; i++)
fprintf(stderr, "\t\t%s\n", g_cmdoptions[i].name);
exit(-1);
}
#ifdef STANDALONE
int main(int argc, char **argv)
#else
extern int fbset_main(int argc, char **argv)
#endif
{
struct fb_var_screeninfo var, varset;
int fh, i;
char *fbdev = DEFAULTFBDEV;
char *modefile = DEFAULTFBMODE;
char *thisarg, *mode = NULL;
memset(&varset, 0xFF, sizeof(varset));
/* parse cmd args.... why do they have to make things so difficult? */
argv++; argc--;
for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
for (i = 0; g_cmdoptions[i].name; i++) {
if (!strcmp(thisarg, g_cmdoptions[i].name)) {
if (argc - 1 < g_cmdoptions[i].param_count) fbset_usage();
switch (g_cmdoptions[i].code) {
case CMD_HELP: fbset_usage();
case CMD_FB: fbdev = argv[1]; break;
case CMD_DB: modefile = argv[1]; break;
case CMD_GEOMETRY:
varset.xres = strtoul(argv[1],0,0);
varset.yres = strtoul(argv[2],0,0);
varset.xres_virtual = strtoul(argv[3],0,0);
varset.yres_virtual = strtoul(argv[4],0,0);
varset.bits_per_pixel = strtoul(argv[5],0,0);
break;
case CMD_TIMING:
varset.pixclock = strtoul(argv[1],0,0);
varset.left_margin = strtoul(argv[2],0,0);
varset.right_margin = strtoul(argv[3],0,0);
varset.upper_margin = strtoul(argv[4],0,0);
varset.lower_margin = strtoul(argv[5],0,0);
varset.hsync_len = strtoul(argv[6],0,0);
varset.vsync_len = strtoul(argv[7],0,0);
break;
#ifdef BB_FBSET_FANCY
case CMD_XRES: varset.xres = strtoul(argv[1],0,0); break;
case CMD_YRES: varset.yres = strtoul(argv[1],0,0); break;
#endif
}
argc -= g_cmdoptions[i].param_count;
argv += g_cmdoptions[i].param_count;
break;
}
}
if (!g_cmdoptions[i].name) {
if (argc == 1) {
mode = *argv;
g_options |= OPT_READMODE;
} else {
fbset_usage();
}
}
}
if ((fh = open(fbdev, O_RDONLY)) < 0) PERROR("fbset(open)");
if (ioctl(fh, FBIOGET_VSCREENINFO, &var)) PERROR("fbset(ioctl)");
if (g_options & OPT_READMODE) {
if (!readmode(&var, modefile, mode)) {
fprintf(stderr, "Unknown video mode `%s'\n", mode);
exit(1);
}
}
setmode(&var, &varset);
if (g_options & OPT_CHANGE)
if (ioctl(fh, FBIOPUT_VSCREENINFO, &var)) PERROR("fbset(ioctl)");
showmode(&var);
close(fh);
return(TRUE);
}