/* 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 <stdio.h>#include <stdlib.h>#include <unistd.h>#include <fcntl.h>#include <errno.h>#include <ctype.h>#include <string.h>#include <sys/ioctl.h>#include "busybox.h"#define DEFAULTFBDEV  "/dev/fb0"#define DEFAULTFBMODE "/etc/fb.modes"static const int OPT_CHANGE   = (1 << 0);static const int OPT_INFO     = (1 << 1);static const int OPT_READMODE = (1 << 2);enum {	CMD_FB = 1,	CMD_DB = 2,	CMD_GEOMETRY = 3,	CMD_TIMING = 4,	CMD_ACCEL = 5,	CMD_HSYNC = 6,	CMD_VSYNC = 7,	CMD_LACED = 8,	CMD_DOUBLE = 9,/* 	CMD_XCOMPAT =     10, */	CMD_ALL = 11,	CMD_INFO = 12,	CMD_CHANGE = 13,#ifdef BB_FEATURE_FBSET_FANCY	CMD_XRES = 100,	CMD_YRES = 101,	CMD_VXRES = 102,	CMD_VYRES = 103,	CMD_DEPTH = 104,	CMD_MATCH = 105,	CMD_PIXCLOCK = 106,	CMD_LEFT = 107,	CMD_RIGHT = 108,	CMD_UPPER = 109,	CMD_LOWER = 110,	CMD_HSLEN = 111,	CMD_VSLEN = 112,	CMD_CSYNC = 113,	CMD_GSYNC = 114,	CMD_EXTSYNC = 115,	CMD_BCAST = 116,	CMD_RGBA = 117,	CMD_STEP = 118,	CMD_MOVE = 119,#endif};static unsigned int g_options = 0;/* Stuff stolen from the kernel's fb.h */static const int FBIOGET_VSCREENINFO = 0x4600;static const int FBIOPUT_VSCREENINFO = 0x4601;#define __u32			u_int32_tstruct 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 */};static struct cmdoptions_t {	char *name;	unsigned char param_count;	unsigned char code;} g_cmdoptions[] = {	{	"-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}, {	"-n", 0, CMD_CHANGE}, {#ifdef BB_FEATURE_FBSET_FANCY	"-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 */static const int FB_VMODE_INTERLACED = 1;	/* interlaced	*/static const int FB_VMODE_DOUBLE = 2;	/* double scan */static const int FB_SYNC_HOR_HIGH_ACT = 1;	/* horizontal sync high active	*/static const int FB_SYNC_VERT_HIGH_ACT = 2;	/* vertical sync high active	*/static const int FB_SYNC_EXT = 4;	/* external sync		*/static const int FB_SYNC_COMP_HIGH_ACT = 8;	/* composite sync high active   */#endifstatic 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;	f = xfopen(fn, "r");	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");#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");}#ifdef STANDALONEint main(int argc, char **argv)#elseextern 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)					show_usage();				switch (g_cmdoptions[i].code) {				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;				case CMD_DEPTH:					varset.bits_per_pixel = 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 {				show_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'", 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;}