/* 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 source tree. * * 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) */ //usage:#define fbset_trivial_usage //usage: "[OPTIONS] [MODE]" //usage:#define fbset_full_usage "\n\n" //usage: "Show and modify frame buffer settings" //usage: //usage:#define fbset_example_usage //usage: "$ fbset\n" //usage: "mode \"1024x768-76\"\n" //usage: " # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz\n" //usage: " geometry 1024 768 1024 768 16\n" //usage: " timings 12714 128 32 16 4 128 4\n" //usage: " accel false\n" //usage: " rgba 5/11,6/5,5/0,0/0\n" //usage: "endmode\n" #include "libbb.h" #define DEFAULTFBDEV FB_0 #define DEFAULTFBMODE "/etc/fb.modes" /* 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 void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt) { do { if ((int32_t) *src > 0) *dst = *src; src++; dst++; } while (--cnt); } static NOINLINE void copy_changed_values( 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; copy_if_gt0(&set->xres, &base->xres, 4); if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel; //copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1); //if ((int32_t) set->pixclock > 0) base->pixclock = set->pixclock; //if ((int32_t) set->left_margin > 0) base->left_margin = set->left_margin; //if ((int32_t) set->right_margin > 0) base->right_margin = set->right_margin; //if ((int32_t) set->upper_margin > 0) base->upper_margin = set->upper_margin; //if ((int32_t) set->lower_margin > 0) base->lower_margin = set->lower_margin; //if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len; //if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len; //if ((int32_t) set->sync > 0) base->sync = set->sync; //if ((int32_t) set->vmode > 0) base->vmode = set->vmode; copy_if_gt0(&set->pixclock, &base->pixclock, 9); } 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_SHOW = 13, CMD_CHANGE = 14, #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 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 }, { "show" , 0, CMD_SHOW }, { "s" , 0, CMD_SHOW }, #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 }; /* taken from linux/fb.h */ enum { FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */ FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */ #if ENABLE_FEATURE_FBSET_READMODE FB_VMODE_INTERLACED = 1, /* interlaced */ FB_VMODE_DOUBLE = 2, /* double scan */ 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; } /* Mode db file contains mode definitions like this: * mode "800x600-48-lace" * # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz * geometry 800 600 800 600 8 * timings 27778 56 80 79 11 128 12 * laced true * hsync high * vsync high * endmode */ static int read_mode_db(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\0rgba\0", token[0]); switch (i) { case 0: if (sizeof(int) == sizeof(base->xres)) { sscanf(p, "%d %d %d %d %d", &base->xres, &base->yres, &base->xres_virtual, &base->yres_virtual, &base->bits_per_pixel); } else { int base_xres, base_yres; int base_xres_virtual, base_yres_virtual; int base_bits_per_pixel; sscanf(p, "%d %d %d %d %d", &base_xres, &base_yres, &base_xres_virtual, &base_yres_virtual, &base_bits_per_pixel); base->xres = base_xres; base->yres = base_yres; base->xres_virtual = base_xres_virtual; base->yres_virtual = base_yres_virtual; base->bits_per_pixel = base_bits_per_pixel; } //bb_info_msg("GEO[%s]", p); break; case 1: if (sizeof(int) == sizeof(base->xres)) { 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 { int base_pixclock; int base_left_margin, base_right_margin; int base_upper_margin, base_lower_margin; int base_hsync_len, base_vsync_len; 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); base->pixclock = base_pixclock; base->left_margin = base_left_margin; base->right_margin = base_right_margin; base->upper_margin = base_upper_margin; base->lower_margin = base_lower_margin; base->hsync_len = base_hsync_len; base->vsync_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; case 8: { int red_offset, red_length; int green_offset, green_length; int blue_offset, blue_length; int transp_offset, transp_length; sscanf(p, "%d/%d,%d/%d,%d/%d,%d/%d", &red_offset, &red_length, &green_offset, &green_length, &blue_offset, &blue_length, &transp_offset, &transp_length); base->red.offset = red_offset; base->red.length = red_length; base->red.msb_right = 0; base->green.offset = green_offset; base->green.length = green_length; base->green.msb_right = 0; base->blue.offset = blue_offset; base->blue.length = blue_length; base->blue.msb_right = 0; base->transp.offset = transp_offset; base->transp.length = transp_length; base->transp.msb_right = 0; } } } return 0; } #endif static NOINLINE 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_SHOW = (1 << 1), OPT_READMODE = (1 << 2), OPT_ALL = (1 << 3), }; struct fb_var_screeninfo var_old, var_set; int fh, i; unsigned options = 0; const char *fbdev = DEFAULTFBDEV; const char *modefile = DEFAULTFBMODE; char *thisarg; char *mode = mode; /* for compiler */ memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */ /* 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] != '-') { if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1) bb_show_usage(); mode = thisarg; options |= OPT_READMODE; goto contin; } 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_ALL: options |= OPT_ALL; break; case CMD_SHOW: options |= OPT_SHOW; break; case CMD_GEOMETRY: var_set.xres = xatou32(argv[1]); var_set.yres = xatou32(argv[2]); var_set.xres_virtual = xatou32(argv[3]); var_set.yres_virtual = xatou32(argv[4]); var_set.bits_per_pixel = xatou32(argv[5]); break; case CMD_TIMING: var_set.pixclock = xatou32(argv[1]); var_set.left_margin = xatou32(argv[2]); var_set.right_margin = xatou32(argv[3]); var_set.upper_margin = xatou32(argv[4]); var_set.lower_margin = xatou32(argv[5]); var_set.hsync_len = xatou32(argv[6]); var_set.vsync_len = xatou32(argv[7]); break; case CMD_ACCEL: break; case CMD_HSYNC: var_set.sync |= FB_SYNC_HOR_HIGH_ACT; break; case CMD_VSYNC: var_set.sync |= FB_SYNC_VERT_HIGH_ACT; break; #if ENABLE_FEATURE_FBSET_FANCY case CMD_XRES: var_set.xres = xatou32(argv[1]); break; case CMD_YRES: var_set.yres = xatou32(argv[1]); break; case CMD_DEPTH: var_set.bits_per_pixel = xatou32(argv[1]); break; #endif } switch (g_cmdoptions[i].code) { case CMD_FB: case CMD_DB: case CMD_ALL: case CMD_SHOW: break; default: /* other commands imply changes */ options |= OPT_CHANGE; } argc -= g_cmdoptions[i].param_count; argv += g_cmdoptions[i].param_count; goto contin; } bb_show_usage(); contin: ; } fh = xopen(fbdev, O_RDONLY); xioctl(fh, FBIOGET_VSCREENINFO, &var_old); if (options & OPT_READMODE) { #if ENABLE_FEATURE_FBSET_READMODE if (!read_mode_db(&var_old, modefile, mode)) { bb_error_msg_and_die("unknown video mode '%s'", mode); } options |= OPT_CHANGE; #endif } if (options & OPT_CHANGE) { copy_changed_values(&var_old, &var_set); if (options & OPT_ALL) var_old.activate = FB_ACTIVATE_ALL; xioctl(fh, FBIOPUT_VSCREENINFO, &var_old); } if (options == 0 || (options & OPT_SHOW)) showmode(&var_old); if (ENABLE_FEATURE_CLEAN_UP) close(fh); return EXIT_SUCCESS; }