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