diff options
Diffstat (limited to 'util-linux/fbset.c')
| -rw-r--r-- | util-linux/fbset.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/util-linux/fbset.c b/util-linux/fbset.c new file mode 100644 index 0000000..590918a --- /dev/null +++ b/util-linux/fbset.c @@ -0,0 +1,404 @@ +/* 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 { + 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 +}; + +/* 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[9]; + const unsigned char param_count; + const unsigned char code; +} g_cmdoptions[] = { + /*"12345678" + NUL */ + { "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 +}; + +#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 (strcmp(buf, what) == 0) + *x &= ~flag; + else + *x |= flag; +} + +static int readmode(struct fb_var_screeninfo *base, const char *fn, + const char *mode) +{ + char *token[2], *p, *s; + parser_t *parser = config_open(fn); + + while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) { + if (strcmp(token[0], "mode") != 0 || !token[1]) + continue; + p = strstr(token[1], mode); + if (!p) + continue; + s = p + strlen(mode); + //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s); + /* exact match? */ + if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */ + || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */ + ) { + //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s)); + break; + } + } + + if (!token[0]) + return 0; + + while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) { + int i; + +//bb_info_msg("???[%s][%s]", token[0], token[1]); + if (strcmp(token[0], "endmode") == 0) { +//bb_info_msg("OK[%s]", mode); + return 1; + } + p = token[1]; + i = index_in_strings( + "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0", + token[0]); + switch (i) { + case 0: + /* 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)); +//bb_info_msg("GEO[%s]", p); + break; + case 1: + 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)); +//bb_info_msg("TIM[%s]", p); + break; + case 2: + case 3: { + static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE}; + ss(&base->vmode, syncs[i-2], p, "false"); +//bb_info_msg("VMODE[%s]", p); + break; + } + case 4: + case 5: + case 6: { + static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT}; + ss(&base->sync, syncs[i-4], p, "low"); +//bb_info_msg("SYNC[%s]", p); + break; + } + case 7: + ss(&base->sync, FB_SYNC_EXT, p, "false"); +//bb_info_msg("EXTSYNC[%s]", p); + break; + } + } + 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) +{ + enum { + OPT_CHANGE = (1 << 0), + /*OPT_INFO = (1 << 1), ??*/ + OPT_READMODE = (1 << 2), + OPT_ALL = (1 << 9), + }; + struct fb_var_screeninfo var, varset; + int fh, i; + unsigned options = 0; + + 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) != NULL; argc--, argv++) { + if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) { + if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0) + continue; + if (argc <= 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: + options |= OPT_ALL; + break; + case CMD_CHANGE: + 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; + goto contin; + } + if (argc != 1) + bb_show_usage(); + mode = *argv; + options |= OPT_READMODE; + contin: ; + } + + fh = xopen(fbdev, O_RDONLY); + xioctl(fh, FBIOGET_VSCREENINFO, &var); + if (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 (options & OPT_CHANGE) { + if (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; +} |