diff options
Diffstat (limited to 'util-linux/fbset.c')
| -rw-r--r-- | util-linux/fbset.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/util-linux/fbset.c b/util-linux/fbset.c new file mode 100644 index 000000000..1aa0a0ac1 --- /dev/null +++ b/util-linux/fbset.c @@ -0,0 +1,407 @@ +/* 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 "busybox.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, + +#ifdef CONFIG_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 */ +#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 }, +#ifdef CONFIG_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 } +}; + +#ifdef CONFIG_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 + +static int readmode(struct fb_var_screeninfo *base, const char *fn, + const char *mode) +{ +#ifdef CONFIG_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"))) + continue; + p += 5; + if (!(p = strstr(buf, mode))) + continue; + 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; + /* 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; + 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 + bb_error_msg("mode reading not compiled in"); +#endif + return 0; +} + +static inline 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 inline 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" +#ifdef CONFIG_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), +#ifdef CONFIG_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); +} + +#ifdef STANDALONE +int main(int argc, char **argv) +#else +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[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; +#ifdef CONFIG_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); + if (ioctl(fh, FBIOGET_VSCREENINFO, &var)) + bb_perror_msg_and_die("ioctl(%sT_VSCREENINFO)", "GE"); + if (g_options & OPT_READMODE) { + if (!readmode(&var, modefile, mode)) { + bb_error_msg_and_die("unknown video mode '%s'", mode); + } + } + + setmode(&var, &varset); + if (g_options & OPT_CHANGE) { + if (g_options & OPT_ALL) + var.activate = FB_ACTIVATE_ALL; + if (ioctl(fh, FBIOPUT_VSCREENINFO, &var)) + bb_perror_msg_and_die("ioctl(%sT_VSCREENINFO)", "PU"); + } + showmode(&var); + /* Don't close the file, as exiting will take care of that */ + /* close(fh); */ + + return EXIT_SUCCESS; +} |