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busybox/fbset.c

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/* vi: set sw=4 ts=4: */
/*
* 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 "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <sys/ioctl.h>
#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
#define CMD_CHANGE 13
#ifdef BB_FEATURE_FBSET_FANCY
#define CMD_XRES 100
#define CMD_YRES 101
#define CMD_VXRES 102
#define CMD_VYRES 103
#define CMD_DEPTH 104
#define CMD_MATCH 105
#define CMD_PIXCLOCK 106
#define CMD_LEFT 107
#define CMD_RIGHT 108
#define CMD_UPPER 109
#define CMD_LOWER 110
#define CMD_HSLEN 111
#define CMD_VSLEN 112
#define CMD_CSYNC 113
#define CMD_GSYNC 114
#define CMD_EXTSYNC 115
#define CMD_BCAST 116
#define CMD_RGBA 117
#define CMD_STEP 118
#define CMD_MOVE 119
#endif
static unsigned int g_options = 0;
/* Stuff stolen from the kernel's fb.h */
#define FBIOGET_VSCREENINFO 0x4600
#define FBIOPUT_VSCREENINFO 0x4601
#define __u32 unsigned int
struct fb_bitfield {
__u32 offset; /* beginning of bitfield */
__u32 length; /* length of bitfield */
__u32 msb_right; /* != 0 : Most significant bit is */
/* right */
};
struct fb_var_screeninfo {
__u32 xres; /* visible resolution */
__u32 yres;
__u32 xres_virtual; /* virtual resolution */
__u32 yres_virtual;
__u32 xoffset; /* offset from virtual to visible */
__u32 yoffset; /* resolution */
__u32 bits_per_pixel; /* guess what */
__u32 grayscale; /* != 0 Graylevels instead of colors */
struct fb_bitfield red; /* bitfield in fb mem if true color, */
struct fb_bitfield green; /* else only length is significant */
struct fb_bitfield blue;
struct fb_bitfield transp; /* transparency */
__u32 nonstd; /* != 0 Non standard pixel format */
__u32 activate; /* see FB_ACTIVATE_* */
__u32 height; /* height of picture in mm */
__u32 width; /* width of picture in mm */
__u32 accel_flags; /* acceleration flags (hints) */
/* Timing: All values in pixclocks, except pixclock (of course) */
__u32 pixclock; /* pixel clock in ps (pico seconds) */
__u32 left_margin; /* time from sync to picture */
__u32 right_margin; /* time from picture to sync */
__u32 upper_margin; /* time from sync to picture */
__u32 lower_margin;
__u32 hsync_len; /* length of horizontal sync */
__u32 vsync_len; /* length of vertical sync */
__u32 sync; /* see FB_SYNC_* */
__u32 vmode; /* see FB_VMODE_* */
__u32 reserved[6]; /* Reserved for future compatibility */
};
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}, {
"-help", 0, CMD_HELP}, {
"-n", 0, CMD_CHANGE}, {
#ifdef BB_FEATURE_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}
};
#ifdef BB_FEATURE_FBSET_READMODE
/* taken from linux/fb.h */
#define FB_VMODE_INTERLACED 1 /* interlaced */
#define FB_VMODE_DOUBLE 2 /* double scan */
#define FB_SYNC_HOR_HIGH_ACT 1 /* horizontal sync high active */
#define FB_SYNC_VERT_HIGH_ACT 2 /* vertical sync high active */
#define FB_SYNC_EXT 4 /* external sync */
#define FB_SYNC_COMP_HIGH_ACT 8 /* composite sync high active */
#endif
static int readmode(struct fb_var_screeninfo *base, const char *fn,
const char *mode)
{
#ifdef BB_FEATURE_FBSET_READMODE
FILE *f;
char buf[256];
char *p = buf;
if ((f = fopen(fn, "r")) == NULL)
perror_msg_and_die("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 ((p = strstr(buf, "geometry "))) {
p += 9;
sscanf(p, "%d %d %d %d %d",
&(base->xres), &(base->yres),
&(base->xres_virtual), &(base->yres_virtual),
&(base->bits_per_pixel));
} else if ((p = strstr(buf, "timings "))) {
p += 8;
sscanf(p, "%d %d %d %d %d %d %d",
&(base->pixclock),
&(base->left_margin), &(base->right_margin),
&(base->upper_margin), &(base->lower_margin),
&(base->hsync_len), &(base->vsync_len));
} else if ((p = strstr(buf, "laced "))) {
p += 6;
if (strstr(buf, "false")) {
base->vmode &= ~FB_VMODE_INTERLACED;
} else {
base->vmode |= FB_VMODE_INTERLACED;
}
} else if ((p = strstr(buf, "double "))) {
p += 7;
if (strstr(buf, "false")) {
base->vmode &= ~FB_VMODE_DOUBLE;
} else {
base->vmode |= FB_VMODE_DOUBLE;
}
} else if ((p = strstr(buf, "vsync "))) {
p += 6;
if (strstr(buf, "low")) {
base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
} else {
base->sync |= FB_SYNC_VERT_HIGH_ACT;
}
} else if ((p = strstr(buf, "hsync "))) {
p += 6;
if (strstr(buf, "low")) {
base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
} else {
base->sync |= FB_SYNC_HOR_HIGH_ACT;
}
} else if ((p = strstr(buf, "csync "))) {
p += 6;
if (strstr(buf, "low")) {
base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
} else {
base->sync |= FB_SYNC_COMP_HIGH_ACT;
}
} else if ((p = strstr(buf, "extsync "))) {
p += 8;
if (strstr(buf, "false")) {
base->sync &= ~FB_SYNC_EXT;
} else {
base->sync |= FB_SYNC_EXT;
}
}
if (strstr(buf, "endmode"))
return 1;
}
}
}
}
#else
error_msg( "mode reading not compiled in\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_FEATURE_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);
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"));
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\n");
}
static void fbset_usage(void)
{
#ifndef BB_FEATURE_TRIVIAL_HELP
int i;
#endif
#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");
#ifndef BB_FEATURE_TRIVIAL_HELP
fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
fprintf(stderr, "The following options are recognized:\n");
for (i = 0; g_cmdoptions[i].name; i++)
fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
#endif
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;
case CMD_CHANGE:
g_options |= OPT_CHANGE;
break;
#ifdef BB_FEATURE_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_msg_and_die("fbset(open)");
if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
perror_msg_and_die("fbset(ioctl)");
if (g_options & OPT_READMODE) {
if (!readmode(&var, modefile, mode)) {
error_msg("Unknown video mode `%s'\n", mode);
return EXIT_FAILURE;
}
}
setmode(&var, &varset);
if (g_options & OPT_CHANGE)
if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
perror_msg_and_die("fbset(ioctl)");
showmode(&var);
/* Don't close the file, as exiting will take care of that */
/* close(fh); */
return EXIT_SUCCESS;
}
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