| /* 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) |
| */ |
| //config:config FBSET |
| //config: bool "fbset" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: fbset is used to show or change the settings of a Linux frame buffer |
| //config: device. The frame buffer device provides a simple and unique |
| //config: interface to access a graphics display. Enable this option |
| //config: if you wish to enable the 'fbset' utility. |
| //config: |
| //config:config FEATURE_FBSET_FANCY |
| //config: bool "Enable extra options" |
| //config: default y |
| //config: depends on FBSET |
| //config: help |
| //config: This option enables extended fbset options, allowing one to set the |
| //config: framebuffer size, color depth, etc. interface to access a graphics |
| //config: display. Enable this option if you wish to enable extended fbset |
| //config: options. |
| //config: |
| //config:config FEATURE_FBSET_READMODE |
| //config: bool "Enable readmode support" |
| //config: default y |
| //config: depends on FBSET |
| //config: help |
| //config: This option allows fbset to read the video mode database stored by |
| //config: default as /etc/fb.modes, which can be used to set frame buffer |
| //config: device to pre-defined video modes. |
| |
| //applet:IF_FBSET(APPLET(fbset, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_FBSET) += fbset.o |
| |
| //usage:#define fbset_trivial_usage |
| //usage: "[OPTIONS] [MODE]" |
| //usage:#define fbset_full_usage "\n\n" |
| //usage: "Show and modify frame buffer settings" |
| //usage: |
| //usage:#define fbset_example_usage |
| //usage: "$ 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 */ |
| //TODO: convert to index_in_strings() |
| { "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_error_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_error_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_error_msg("???[%s][%s]", token[0], token[1]); |
| if (strcmp(token[0], "endmode") == 0) { |
| //bb_error_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_error_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_error_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_error_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_error_msg("SYNC[%s]", p); |
| break; |
| } |
| case 7: |
| ss(&base->sync, FB_SYNC_EXT, p, "false"); |
| //bb_error_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_length, &red_offset, |
| &green_length, &green_offset, |
| &blue_length, &blue_offset, |
| &transp_length, &transp_offset); |
| 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; |
| IF_FEATURE_FBSET_READMODE(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: |
| IF_FEATURE_FBSET_READMODE(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; |
| } |