425 lines
13 KiB
C
425 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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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 <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 <string.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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#define DEFAULTFBDEV "/dev/fb0"
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#define DEFAULTFBMODE "/etc/fb.modes"
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static const int OPT_CHANGE = (1 << 0);
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static const int OPT_INFO = (1 << 1);
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static const int OPT_READMODE = (1 << 2);
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enum {
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CMD_FB = 1,
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CMD_DB = 2,
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CMD_GEOMETRY = 3,
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CMD_TIMING = 4,
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CMD_ACCEL = 5,
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CMD_HSYNC = 6,
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CMD_VSYNC = 7,
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CMD_LACED = 8,
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CMD_DOUBLE = 9,
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/* CMD_XCOMPAT = 10, */
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CMD_ALL = 11,
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CMD_INFO = 12,
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CMD_CHANGE = 13,
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#ifdef CONFIG_FEATURE_FBSET_FANCY
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CMD_XRES = 100,
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CMD_YRES = 101,
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CMD_VXRES = 102,
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CMD_VYRES = 103,
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CMD_DEPTH = 104,
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CMD_MATCH = 105,
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CMD_PIXCLOCK = 106,
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CMD_LEFT = 107,
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CMD_RIGHT = 108,
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CMD_UPPER = 109,
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CMD_LOWER = 110,
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CMD_HSLEN = 111,
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CMD_VSLEN = 112,
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CMD_CSYNC = 113,
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CMD_GSYNC = 114,
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CMD_EXTSYNC = 115,
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CMD_BCAST = 116,
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CMD_RGBA = 117,
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CMD_STEP = 118,
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CMD_MOVE = 119,
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#endif
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};
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static unsigned int g_options = 0;
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/* Stuff stolen from the kernel's fb.h */
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static const int FBIOGET_VSCREENINFO = 0x4600;
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static const int FBIOPUT_VSCREENINFO = 0x4601;
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#define __u32 u_int32_t
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struct fb_bitfield {
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__u32 offset; /* beginning of bitfield */
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__u32 length; /* length of bitfield */
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__u32 msb_right; /* != 0 : Most significant bit is */
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/* right */
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};
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struct fb_var_screeninfo {
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__u32 xres; /* visible resolution */
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__u32 yres;
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__u32 xres_virtual; /* virtual resolution */
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__u32 yres_virtual;
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__u32 xoffset; /* offset from virtual to visible */
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__u32 yoffset; /* resolution */
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__u32 bits_per_pixel; /* guess what */
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__u32 grayscale; /* != 0 Graylevels instead of colors */
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struct fb_bitfield red; /* bitfield in fb mem if true color, */
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struct fb_bitfield green; /* else only length is significant */
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struct fb_bitfield blue;
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struct fb_bitfield transp; /* transparency */
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__u32 nonstd; /* != 0 Non standard pixel format */
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__u32 activate; /* see FB_ACTIVATE_* */
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__u32 height; /* height of picture in mm */
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__u32 width; /* width of picture in mm */
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__u32 accel_flags; /* acceleration flags (hints) */
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/* Timing: All values in pixclocks, except pixclock (of course) */
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__u32 pixclock; /* pixel clock in ps (pico seconds) */
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__u32 left_margin; /* time from sync to picture */
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__u32 right_margin; /* time from picture to sync */
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__u32 upper_margin; /* time from sync to picture */
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__u32 lower_margin;
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__u32 hsync_len; /* length of horizontal sync */
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__u32 vsync_len; /* length of vertical sync */
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__u32 sync; /* see FB_SYNC_* */
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__u32 vmode; /* see FB_VMODE_* */
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__u32 reserved[6]; /* Reserved for future compatibility */
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};
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static 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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{
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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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"-n", 0, CMD_CHANGE}, {
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#ifdef CONFIG_FEATURE_FBSET_FANCY
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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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#ifdef CONFIG_FEATURE_FBSET_READMODE
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/* taken from linux/fb.h */
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static const int FB_VMODE_INTERLACED = 1; /* interlaced */
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static const int FB_VMODE_DOUBLE = 2; /* double scan */
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static const int FB_SYNC_HOR_HIGH_ACT = 1; /* horizontal sync high active */
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static const int FB_SYNC_VERT_HIGH_ACT = 2; /* vertical sync high active */
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static const int FB_SYNC_EXT = 4; /* external sync */
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static const int FB_SYNC_COMP_HIGH_ACT = 8; /* composite sync high active */
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#endif
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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 CONFIG_FEATURE_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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f = xfopen(fn, "r");
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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 != '"')
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&& (*p != '\r') && (*p != '\n'))
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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 ((p = strstr(buf, "geometry "))) {
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p += 9;
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sscanf(p, "%d %d %d %d %d",
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&(base->xres), &(base->yres),
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&(base->xres_virtual), &(base->yres_virtual),
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&(base->bits_per_pixel));
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} else if ((p = strstr(buf, "timings "))) {
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p += 8;
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sscanf(p, "%d %d %d %d %d %d %d",
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&(base->pixclock),
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&(base->left_margin), &(base->right_margin),
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&(base->upper_margin), &(base->lower_margin),
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&(base->hsync_len), &(base->vsync_len));
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} else if ((p = strstr(buf, "laced "))) {
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p += 6;
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if (strstr(buf, "false")) {
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base->vmode &= ~FB_VMODE_INTERLACED;
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} else {
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base->vmode |= FB_VMODE_INTERLACED;
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}
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} else if ((p = strstr(buf, "double "))) {
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p += 7;
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if (strstr(buf, "false")) {
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base->vmode &= ~FB_VMODE_DOUBLE;
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} else {
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base->vmode |= FB_VMODE_DOUBLE;
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}
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} else if ((p = strstr(buf, "vsync "))) {
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p += 6;
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if (strstr(buf, "low")) {
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base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
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} else {
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base->sync |= FB_SYNC_VERT_HIGH_ACT;
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}
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} else if ((p = strstr(buf, "hsync "))) {
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p += 6;
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if (strstr(buf, "low")) {
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base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
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} else {
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base->sync |= FB_SYNC_HOR_HIGH_ACT;
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}
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} else if ((p = strstr(buf, "csync "))) {
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p += 6;
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if (strstr(buf, "low")) {
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base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
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} else {
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base->sync |= FB_SYNC_COMP_HIGH_ACT;
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}
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} else if ((p = strstr(buf, "extsync "))) {
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p += 8;
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if (strstr(buf, "false")) {
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base->sync &= ~FB_SYNC_EXT;
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} else {
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base->sync |= FB_SYNC_EXT;
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}
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}
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if (strstr(buf, "endmode"))
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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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error_msg( "mode reading not compiled in");
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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)
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base->xres = set->xres;
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if ((int) set->yres > 0)
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base->yres = set->yres;
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if ((int) set->xres_virtual > 0)
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base->xres_virtual = set->xres_virtual;
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if ((int) set->yres_virtual > 0)
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base->yres_virtual = set->yres_virtual;
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if ((int) set->bits_per_pixel > 0)
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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 =
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drate / (v->left_margin + v->xres + v->right_margin +
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v->hsync_len);
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vrate =
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hrate / (v->upper_margin + v->yres + v->lower_margin +
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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 CONFIG_FEATURE_FBSET_FANCY
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printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
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hrate / 1e3, 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,
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v->red.offset, v->green.length, v->green.offset, v->blue.length,
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v->blue.offset, v->transp.length, v->transp.offset);
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printf("endmode\n\n");
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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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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++;
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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)
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show_usage();
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switch (g_cmdoptions[i].code) {
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case CMD_FB:
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fbdev = argv[1];
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break;
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case CMD_DB:
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modefile = argv[1];
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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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case CMD_CHANGE:
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g_options |= OPT_CHANGE;
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break;
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#ifdef CONFIG_FEATURE_FBSET_FANCY
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case CMD_XRES:
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varset.xres = strtoul(argv[1], 0, 0);
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break;
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case CMD_YRES:
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varset.yres = strtoul(argv[1], 0, 0);
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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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show_usage();
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}
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}
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}
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if ((fh = open(fbdev, O_RDONLY)) < 0)
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perror_msg_and_die("fbset(open)");
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if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
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perror_msg_and_die("fbset(ioctl)");
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if (g_options & OPT_READMODE) {
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if (!readmode(&var, modefile, mode)) {
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error_msg("Unknown video mode `%s'", mode);
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return EXIT_FAILURE;
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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))
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perror_msg_and_die("fbset(ioctl)");
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showmode(&var);
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/* Don't close the file, as exiting will take care of that */
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/* close(fh); */
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return EXIT_SUCCESS;
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}
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