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hush/util-linux/fbset.c
Denis Vlasenko d91afa33fd randomconfig fixes
2008-07-29 11:10:01 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Mini fbset implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* 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 "libbb.h"
#define DEFAULTFBDEV FB_0
#define DEFAULTFBMODE "/etc/fb.modes"
enum {
OPT_CHANGE = (1 << 0),
OPT_INFO = (1 << 1),
OPT_READMODE = (1 << 2),
OPT_ALL = (1 << 9),
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,
#if ENABLE_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 g_options;
/* Stuff stolen from the kernel's fb.h */
#define FB_ACTIVATE_ALL 64
enum {
FBIOGET_VSCREENINFO = 0x4600,
FBIOPUT_VSCREENINFO = 0x4601
};
struct fb_bitfield {
uint32_t offset; /* beginning of bitfield */
uint32_t length; /* length of bitfield */
uint32_t msb_right; /* !=0: Most significant bit is right */
};
struct fb_var_screeninfo {
uint32_t xres; /* visible resolution */
uint32_t yres;
uint32_t xres_virtual; /* virtual resolution */
uint32_t yres_virtual;
uint32_t xoffset; /* offset from virtual to visible */
uint32_t yoffset; /* resolution */
uint32_t bits_per_pixel;
uint32_t 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 */
uint32_t nonstd; /* !=0 Non standard pixel format */
uint32_t activate; /* see FB_ACTIVATE_x */
uint32_t height; /* height of picture in mm */
uint32_t width; /* width of picture in mm */
uint32_t accel_flags; /* acceleration flags (hints) */
/* Timing: All values in pixclocks, except pixclock (of course) */
uint32_t pixclock; /* pixel clock in ps (pico seconds) */
uint32_t left_margin; /* time from sync to picture */
uint32_t right_margin; /* time from picture to sync */
uint32_t upper_margin; /* time from sync to picture */
uint32_t lower_margin;
uint32_t hsync_len; /* length of horizontal sync */
uint32_t vsync_len; /* length of vertical sync */
uint32_t sync; /* see FB_SYNC_x */
uint32_t vmode; /* see FB_VMODE_x */
uint32_t reserved[6]; /* Reserved for future compatibility */
};
static const struct cmdoptions_t {
const char name[10];
const unsigned char param_count;
const 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 },
#if ENABLE_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 }
};
#if ENABLE_FEATURE_FBSET_READMODE
/* taken from linux/fb.h */
enum {
FB_VMODE_INTERLACED = 1, /* interlaced */
FB_VMODE_DOUBLE = 2, /* double scan */
FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
FB_SYNC_EXT = 4, /* external sync */
FB_SYNC_COMP_HIGH_ACT = 8 /* composite sync high active */
};
#endif
#if ENABLE_FEATURE_FBSET_READMODE
static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
{
if (strstr(buf, what))
*x &= ~flag;
else
*x |= flag;
}
static int readmode(struct fb_var_screeninfo *base, const char *fn,
const char *mode)
{
FILE *f;
char buf[256];
char *p = buf;
f = xfopen_for_read(fn);
while (fgets(buf, sizeof(buf), f)) {
p = strstr(buf, "mode ");
if (!p && !(p = strstr(buf, "mode\t")))
continue;
p = strstr(p + 5, mode);
if (!p)
continue;
p += strlen(mode);
if (!isspace(*p) && (*p != 0) && (*p != '"')
&& (*p != '\r') && (*p != '\n')
) {
continue; /* almost, but not quite */
}
while (fgets(buf, sizeof(buf), f)) {
if ((p = strstr(buf, "geometry "))) {
p += 9;
/* FIXME: catastrophic on arches with 64bit ints */
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;
ss(&base->vmode, FB_VMODE_INTERLACED, buf, "false");
} else if ((p = strstr(buf, "double "))) {
//p += 7;
ss(&base->vmode, FB_VMODE_DOUBLE, buf, "false");
} else if ((p = strstr(buf, "vsync "))) {
//p += 6;
ss(&base->sync, FB_SYNC_VERT_HIGH_ACT, buf, "low");
} else if ((p = strstr(buf, "hsync "))) {
//p += 6;
ss(&base->sync, FB_SYNC_HOR_HIGH_ACT, buf, "low");
} else if ((p = strstr(buf, "csync "))) {
//p += 6;
ss(&base->sync, FB_SYNC_COMP_HIGH_ACT, buf, "low");
} else if ((p = strstr(buf, "extsync "))) {
//p += 8;
ss(&base->sync, FB_SYNC_EXT, buf, "false");
}
if (strstr(buf, "endmode"))
return 1;
}
}
return 0;
}
#endif
static void setmode(struct fb_var_screeninfo *base,
struct fb_var_screeninfo *set)
{
if ((int32_t) set->xres > 0)
base->xres = set->xres;
if ((int32_t) set->yres > 0)
base->yres = set->yres;
if ((int32_t) set->xres_virtual > 0)
base->xres_virtual = set->xres_virtual;
if ((int32_t) set->yres_virtual > 0)
base->yres_virtual = set->yres_virtual;
if ((int32_t) 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"
#if ENABLE_FEATURE_FBSET_FANCY
"\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
#endif
"\tgeometry %u %u %u %u %u\n"
"\ttimings %u %u %u %u %u %u %u\n"
"\taccel %s\n"
"\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
"endmode\n\n",
v->xres, v->yres, (int) (vrate + 0.5),
#if ENABLE_FEATURE_FBSET_FANCY
drate / 1e6, hrate / 1e3, vrate,
#endif
v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
v->hsync_len, v->vsync_len,
(v->accel_flags > 0 ? "true" : "false"),
v->red.length, v->red.offset, v->green.length, v->green.offset,
v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
}
int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fbset_main(int argc, char **argv)
{
struct fb_var_screeninfo var, varset;
int fh, i;
const char *fbdev = DEFAULTFBDEV;
const 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[0]; i++) {
if (strcmp(thisarg, g_cmdoptions[i].name))
continue;
if (argc-1 < g_cmdoptions[i].param_count)
bb_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 = xatou32(argv[1]);
varset.yres = xatou32(argv[2]);
varset.xres_virtual = xatou32(argv[3]);
varset.yres_virtual = xatou32(argv[4]);
varset.bits_per_pixel = xatou32(argv[5]);
break;
case CMD_TIMING:
varset.pixclock = xatou32(argv[1]);
varset.left_margin = xatou32(argv[2]);
varset.right_margin = xatou32(argv[3]);
varset.upper_margin = xatou32(argv[4]);
varset.lower_margin = xatou32(argv[5]);
varset.hsync_len = xatou32(argv[6]);
varset.vsync_len = xatou32(argv[7]);
break;
case CMD_ALL:
g_options |= OPT_ALL;
break;
case CMD_CHANGE:
g_options |= OPT_CHANGE;
break;
#if ENABLE_FEATURE_FBSET_FANCY
case CMD_XRES:
varset.xres = xatou32(argv[1]);
break;
case CMD_YRES:
varset.yres = xatou32(argv[1]);
break;
case CMD_DEPTH:
varset.bits_per_pixel = xatou32(argv[1]);
break;
#endif
}
argc -= g_cmdoptions[i].param_count;
argv += g_cmdoptions[i].param_count;
break;
}
if (!g_cmdoptions[i].name[0]) {
if (argc != 1)
bb_show_usage();
mode = *argv;
g_options |= OPT_READMODE;
}
}
fh = xopen(fbdev, O_RDONLY);
xioctl(fh, FBIOGET_VSCREENINFO, &var);
if (g_options & OPT_READMODE) {
#if !ENABLE_FEATURE_FBSET_READMODE
bb_show_usage();
#else
if (!readmode(&var, modefile, mode)) {
bb_error_msg_and_die("unknown video mode '%s'", mode);
}
#endif
}
setmode(&var, &varset);
if (g_options & OPT_CHANGE) {
if (g_options & OPT_ALL)
var.activate = FB_ACTIVATE_ALL;
xioctl(fh, FBIOPUT_VSCREENINFO, &var);
}
showmode(&var);
/* Don't close the file, as exiting will take care of that */
/* close(fh); */
return EXIT_SUCCESS;
}
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